Stabiliser

FIELD: electricity.

SUBSTANCE: invention is referred to radio engineering and automotive industry, in particular to stabilisers stabilising characteristics of electric circuits, and may be used in devices stabilising light intensity in electric equipment of automotive vehicles. Technical result is oriented towards improved reliability and stabilising quality of LED intensity. Technical result is attained due to the fact the stabiliser contains additional in-series resistor and light-emitting diode (LED) coupled to the stabiliser output, and a divider element connected between the base and negative pole of the source is made as a photocell and located in the pathway of LED light flux.

EFFECT: invention improves reliability and stabilising quality of LED brightness due to changes in wide range of LED glow intensity at small changes in supply voltage; it also has larger functionality.

1 dwg

 

The invention relates to radio engineering and automotive industries, in particular to the stabilizers of the characteristics of electrical circuits and can be used in devices for the stabilization of the brightness of light sources in the electrical system of automotive vehicles.

Known stabilizer brightness led light source, containing a voltage divider [Morozov, A. G., Electrical engineering, electronics and pulse technique. - M.: Vysshaya SHKOLA, 1987. - 420 p.; Timakov O. N., Lyubchenko V. K. Selectors pulses. - M.: Higher school, 1966. - 270 p.]. The divider is a series-connected resistor and led. The resistor value is chosen from the conditions of the current is equal to the current of the LEDs. A disadvantage of the known device is that the fluctuations of the supply voltage varies proportionally to the voltage at the led, which leads to a change in the intensity of light emitted.

The closest to the proposed invention is a stabilizer brightness led light source, containing a transistor, a voltage divider, made in the form of a resistor and a Zener diode connected to the power source and the mid-point to the base of transistor [Morozov, A. G., Electrical engineering, electronics and pulse technique. - M.: Vysshaya SHKOLA, 1987. - 420 p.; Timakov O. N., Lyubchenko V. K. Selectors pulses. - M.: Higher school, 1966. - 270 p.].

The stabilizer works on the principle of limiting the voltage of the power supply while maintaining a constant voltage at the output of the stabilizer, which is performed by maintaining a constant voltage on the base of the transistor through the Zener diode.

A disadvantage of the known device is that the feedback stabilizer is galvanic in nature, which limits the functionality of the stabilizer.

The technical result is aimed at enhancing the capacity of the stabilizer.

The technical result is achieved in that the stabilizer brightness led light source, containing a transistor, a voltage divider connected to the power source and the mid-point to the base of the transistor is further provided with a series connected resistor and led connected to the output of the stabilizer, and the element of the divider, connected between the base and the negative pole of the source is made in the form of a photoresistor and located in the path of the luminous flux of the led.

A distinctive feature of the present invention is that the stabilizer of the brightness of the led light source is further provided with a series connected resistor and led connected to VGA output�the stabilizer, but an element of the divider, connected between the base and the negative pole of the source is made in the form of a photoresistor and located in the path of the luminous flux of the led.

The figure is a schematic diagram of the stabilizer.

The stabilizer contains one n-p-n transistor VT, resistor R2, the led VD, a voltage divider, made in the form of a resistor R1 and photo-resistor VR connected to the midpoint of the base of the transistor VT. The output of the stabilizer is connected to a load resistance R. the power Source E is connected to the collector of the silicon transistor.

The voltage regulator is in the stabilizer is made by changing the resistance of the photoresistor. At rated voltage at the input circuit is set to the nominal output voltage for a given load R. the Current passes through the transistor VT and is fed to a load resistance R. the Resistors R1 and VR is chosen nominal operating mode of the transistor. When this led is configured to average the mode of illumination, which is provided by the resistor R2. When the voltage of the input power the output voltage increases, the intensity of the luminous flux of the led VD increases, respectively, the illumination of the photoresistor VR increases, the concentration of charge carriers in the photoresistor VR increases and its resistance decreases. P�and the voltage across the photoresistor VR, and accordingly on the base of the transistor VT is decreased and the current of the transistor decreases, the output voltage decreases. With the increase of the input voltage increases and the current through the divider resistor R1 photoresistor VR". The voltage across the photoresistor increases and the transistor VT should be more open, increasing the output voltage. However, reducing the voltage across the photoresistor significantly more because of the steep dependence of the light intensity of the led CD from tension. Therefore, in the sum of the voltage at the input of the stabilizer is offset by a decrease of voltage across the photoresistor and the current reduction transistor.

With decreasing voltage at the input of the led glow CD decreases the resistance of the photoresistor VR increases, the voltage at the base of VT increases, the transistor opens more, the current increases and the output voltage increases.

In this joint work led CD, photoresistors VR transistor and VT is the voltage to change the brightness of the light emitted by the led. In the proposed device voltage feedback in the form of light and atoms have the ability to control the output voltage by changing the brightness of the led for the nominal mode and the magnitude of the current through the photoresistor in nomi�hoc mode using the resistance R1 and R2.

Comparative analysis with the prototype showed that the proposed stabilizer improves the reliability and quality of stabilization of the brightness of the led due to changes in a wide range of light intensity of the led at small changes of the supply voltage; has greater functionality with a simpler structure with fewer elements. Regulation of the luminous flux at rated speed can be regulated value of the output voltage of the stabilizer.

Stabilizer brightness led light source, containing a transistor, a voltage divider connected to the power source and the mid-point to the base of the transistor, characterized in that it further comprises a series-connected resistor and diode connected to the output of the stabilizer, and the element of the divider, connected between the base and the negative pole of the source is made in the form of a photoresistor and located in the path of the luminous flux of the led.



 

Same patents:

FIELD: electrical engineering.

SUBSTANCE: redundant voltage stabiliser based on MIS transistors with positive outputs of each voltage stabiliser are connected through diodes at the load and source of the regulating MIS transistor through measuring resistance is connected to the stabiliser output and to the base of current-limiting n-p-n transistor while emitter of this transistor is connected to the stabiliser output and collector to the gate of regulating MIS transistor; there is an additional tripping MIS transistor with p-channel connected in-series between positive output and drain of the regulating MIS transistor, its emitter is connected to the connection point of drains of MIS transistors and its base through Zener diode and resistor connected in-series is connected to the stabiliser output; n-p-n transistor with emitter connected to the common point, the base through resistance is connected to the collector of p-n-p transistor and collector through resistor to the gate of a tripping MIS transistor; starting capacitor which is connected between the collector and emitter of n-p-n transistor; limiting resistor connected between the output of reference-voltage source and the gate of regulating MIS transistor.

EFFECT: reliability improvement.

1 dwg

FIELD: electricity.

SUBSTANCE: circuit (10) of power ratio control comprises input units (n1, n2), which receive rectified input voltage, being rectified input voltage of an electric grid, and an excitation circuit (IC1), which excites a switch (M1). The serial assembly of a switch and a throttle (L1) is installed between input units. The serial assembly of a rectifier (D1) and an input capacitor (C2) is arranged in parallel to the throttle (L1). The rectifier does not conduct current, when the switch is closed. The excitation circuit excites the switch to generate sinusoidal current via a switch, which is synchronised with sinusoidal voltage of input voltage of the electric grid. Due to layout of the output capacitor in the circuit of power ratio control, the output capacitor may be charged only after the first cycle of conducting the switch current. The advantage of this layout is the fact that the start-up current does not arise before or after the first cycle of switch current conducting.

EFFECT: increased reliability.

12 cl, 9 dwg

FIELD: electrical engineering.

SUBSTANCE: method for single-cycle control of power factor correction. The method is applied for an up-converter and implemented by way of the system main control microcircuit. In the method, the discrete value of bus voltage U0 and the discrete value of inductive current ig are determined during launch of an analogue-digital converter discretisation. Voltages u1(t) and u2(t) are calculated in accordance with the formulae provided. PWM signal duty factor is calculated in accordance with computed voltages. One derives PWM signal and calculates the next time of the analogue-digital converter discretisation launch in accordance with the duty factor (I), Rs standing for a current-sensing resistor resistance, um - for voltage achieved by way of control of the difference between voltage U0 and the reference value Uref via a proportional integral regulator, T standing for switching period.

EFFECT: simplification of the algorithm of single-cycle control of power factor correction.

4 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: coefficient of inverter capacity in average makes 0.725. The method of control of a dependent inverter of a single-phase AC current consists in supply of control pulses at each zone of control into appropriate half-waves of grid voltage with an adjustable angle βadj and a non-controlled angle β to controlled valves of cathode and anode groups of the bridge at appropriate time intervals in the same sequence, which is specified in the invention formula.

EFFECT: higher coefficient of inverter capacity as a whole also by increasing capacity coefficient at the first zone of control due to increased time interval of generator energy inversion into a grid at this zone and reduction of time interval of power consumption from a grid to a generator.

3 dwg

FIELD: electricity.

SUBSTANCE: electric power supply (IP) of electromagnetic compensators (EMK) consists of DNVS (1), IZV (2), the first (3) and the second (4) adders, phase-shifting pulse-width modulation converter (5), HF filter (6), VK (7), comparator (8), DPVN (9), inverter (10), FSI (11), DTI (12), DVT (13) and load (14). Connection of the above elements of IP circuit of EMK forms two feedback loops: one for current and the other one for voltage. Such circuit provides the possibility of suppressing the pulsations of output current and interference of the network for arbitrary types of load, active and reactive, without reducing the efficiency of the device.

EFFECT: reaching deeper suppression of appearing current pulsations and providing protection against pulse interference.

2 dwg

Lowering stabiliser // 2339072

FIELD: electricity.

SUBSTANCE: source of p-channel pass transistor (1) with isolated gate is connected to input bus (2), and drain is connected to input of rectifier filter. Output of smoothing filter (3) is connected to output bus (4) and first output of the first resistor (5). The second output of the first resistor (5) is connected via the second resistor (6) to common bus and to non-inverting input of differential voltage comparator (7). The inverting input of differential voltage comparator (7) is connected to reference voltage source (8). The first output of condenser (15) is connected to smoothing filter (3) output, and the second output is connected to non-inverting input of differential voltage comparator (7). Output of differential voltage comparator (7) is connected with the first output of the third resistor (9), anode of diode (13) and via the fourth resistor (10) - with input bus (2). Stabilitron cathode (11) is connected to input bus (2) and its anode - to the seconf output of the third resistor (9) and cathode of the first diode from the circuit of n connected in series diodes (12) (where n=2) where anode of the last in the series diode is connected with p-channel pass transistor gate (1) (the transistor with isolated gate), cathode of diode (13) and via parallel RC-circuit (12) - with input bus (2). Smoothing filter (3) is made as LCD-filter.

EFFECT: limiting and thermal stabilisation of current; protection against inrush currents and short-circuit currents stabilisation.

3 cl, 3 dwg

FIELD: electrical engineering.

SUBSTANCE: testing of method and device has been performed by means of modeling in Simulink medium. Results of research proved effect of voltage oscillation suppression at inlet and outlet capacitor filters by means of introduction of phase shift in control of voltage converters. Result is achieved by formation of phase shift for every channel of control of single voltage converters.

EFFECT: quality of output voltage stabilisation is preserved; reduction of differential component of conductive interference.

5 dwg

FIELD: automatic control, possible use for systems with wide-pulse adjustment, possible broad use in controlled secondary power sources.

SUBSTANCE: in incrementing type transformer, voltage on accumulating throttle on interval before and after commutation of key element equals respectively Uin-U1 and Uin-U2, where Uin - power voltage, U1, U2 - voltages at output of accumulating throttle on intervals before and after commutation of key element.

EFFECT: expanded functional capabilities of control method due to its extension for incrementing type transformers.

1 dwg

FIELD: automatic control, possible use for systems with wide-pulse adjustment, possible broad use in controlled secondary power sources.

SUBSTANCE: in incrementing type transformer, voltage on accumulating throttle on interval before and after commutation of key element equals respectively Uin-U1 and Uin-U2, where Uin - power voltage, U1, U2 - voltages at output of accumulating throttle on intervals before and after commutation of key element.

EFFECT: expanded functional capabilities of control method due to its extension for incrementing type transformers.

1 dwg

FIELD: electrical engineering.

SUBSTANCE: testing of method and device has been performed by means of modeling in Simulink medium. Results of research proved effect of voltage oscillation suppression at inlet and outlet capacitor filters by means of introduction of phase shift in control of voltage converters. Result is achieved by formation of phase shift for every channel of control of single voltage converters.

EFFECT: quality of output voltage stabilisation is preserved; reduction of differential component of conductive interference.

5 dwg

Lowering stabiliser // 2339072

FIELD: electricity.

SUBSTANCE: source of p-channel pass transistor (1) with isolated gate is connected to input bus (2), and drain is connected to input of rectifier filter. Output of smoothing filter (3) is connected to output bus (4) and first output of the first resistor (5). The second output of the first resistor (5) is connected via the second resistor (6) to common bus and to non-inverting input of differential voltage comparator (7). The inverting input of differential voltage comparator (7) is connected to reference voltage source (8). The first output of condenser (15) is connected to smoothing filter (3) output, and the second output is connected to non-inverting input of differential voltage comparator (7). Output of differential voltage comparator (7) is connected with the first output of the third resistor (9), anode of diode (13) and via the fourth resistor (10) - with input bus (2). Stabilitron cathode (11) is connected to input bus (2) and its anode - to the seconf output of the third resistor (9) and cathode of the first diode from the circuit of n connected in series diodes (12) (where n=2) where anode of the last in the series diode is connected with p-channel pass transistor gate (1) (the transistor with isolated gate), cathode of diode (13) and via parallel RC-circuit (12) - with input bus (2). Smoothing filter (3) is made as LCD-filter.

EFFECT: limiting and thermal stabilisation of current; protection against inrush currents and short-circuit currents stabilisation.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: electric power supply (IP) of electromagnetic compensators (EMK) consists of DNVS (1), IZV (2), the first (3) and the second (4) adders, phase-shifting pulse-width modulation converter (5), HF filter (6), VK (7), comparator (8), DPVN (9), inverter (10), FSI (11), DTI (12), DVT (13) and load (14). Connection of the above elements of IP circuit of EMK forms two feedback loops: one for current and the other one for voltage. Such circuit provides the possibility of suppressing the pulsations of output current and interference of the network for arbitrary types of load, active and reactive, without reducing the efficiency of the device.

EFFECT: reaching deeper suppression of appearing current pulsations and providing protection against pulse interference.

2 dwg

FIELD: electricity.

SUBSTANCE: coefficient of inverter capacity in average makes 0.725. The method of control of a dependent inverter of a single-phase AC current consists in supply of control pulses at each zone of control into appropriate half-waves of grid voltage with an adjustable angle βadj and a non-controlled angle β to controlled valves of cathode and anode groups of the bridge at appropriate time intervals in the same sequence, which is specified in the invention formula.

EFFECT: higher coefficient of inverter capacity as a whole also by increasing capacity coefficient at the first zone of control due to increased time interval of generator energy inversion into a grid at this zone and reduction of time interval of power consumption from a grid to a generator.

3 dwg

FIELD: electrical engineering.

SUBSTANCE: method for single-cycle control of power factor correction. The method is applied for an up-converter and implemented by way of the system main control microcircuit. In the method, the discrete value of bus voltage U0 and the discrete value of inductive current ig are determined during launch of an analogue-digital converter discretisation. Voltages u1(t) and u2(t) are calculated in accordance with the formulae provided. PWM signal duty factor is calculated in accordance with computed voltages. One derives PWM signal and calculates the next time of the analogue-digital converter discretisation launch in accordance with the duty factor (I), Rs standing for a current-sensing resistor resistance, um - for voltage achieved by way of control of the difference between voltage U0 and the reference value Uref via a proportional integral regulator, T standing for switching period.

EFFECT: simplification of the algorithm of single-cycle control of power factor correction.

4 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: circuit (10) of power ratio control comprises input units (n1, n2), which receive rectified input voltage, being rectified input voltage of an electric grid, and an excitation circuit (IC1), which excites a switch (M1). The serial assembly of a switch and a throttle (L1) is installed between input units. The serial assembly of a rectifier (D1) and an input capacitor (C2) is arranged in parallel to the throttle (L1). The rectifier does not conduct current, when the switch is closed. The excitation circuit excites the switch to generate sinusoidal current via a switch, which is synchronised with sinusoidal voltage of input voltage of the electric grid. Due to layout of the output capacitor in the circuit of power ratio control, the output capacitor may be charged only after the first cycle of conducting the switch current. The advantage of this layout is the fact that the start-up current does not arise before or after the first cycle of switch current conducting.

EFFECT: increased reliability.

12 cl, 9 dwg

FIELD: electrical engineering.

SUBSTANCE: redundant voltage stabiliser based on MIS transistors with positive outputs of each voltage stabiliser are connected through diodes at the load and source of the regulating MIS transistor through measuring resistance is connected to the stabiliser output and to the base of current-limiting n-p-n transistor while emitter of this transistor is connected to the stabiliser output and collector to the gate of regulating MIS transistor; there is an additional tripping MIS transistor with p-channel connected in-series between positive output and drain of the regulating MIS transistor, its emitter is connected to the connection point of drains of MIS transistors and its base through Zener diode and resistor connected in-series is connected to the stabiliser output; n-p-n transistor with emitter connected to the common point, the base through resistance is connected to the collector of p-n-p transistor and collector through resistor to the gate of a tripping MIS transistor; starting capacitor which is connected between the collector and emitter of n-p-n transistor; limiting resistor connected between the output of reference-voltage source and the gate of regulating MIS transistor.

EFFECT: reliability improvement.

1 dwg

Stabiliser // 2555324

FIELD: electricity.

SUBSTANCE: invention is referred to radio engineering and automotive industry, in particular to stabilisers stabilising characteristics of electric circuits, and may be used in devices stabilising light intensity in electric equipment of automotive vehicles. Technical result is oriented towards improved reliability and stabilising quality of LED intensity. Technical result is attained due to the fact the stabiliser contains additional in-series resistor and light-emitting diode (LED) coupled to the stabiliser output, and a divider element connected between the base and negative pole of the source is made as a photocell and located in the pathway of LED light flux.

EFFECT: invention improves reliability and stabilising quality of LED brightness due to changes in wide range of LED glow intensity at small changes in supply voltage; it also has larger functionality.

1 dwg

FIELD: electricity.

SUBSTANCE: in a method to control dependent inverter of single-phase AC current at specified in the application materials control of valves of anode and cathode groups of the dependent inverter bridge in the first and second half-periods of control pulses with an adjustable angle βadj and a non-adjustable angle β in the respective areas for adjustment auxiliary control pulses are supplied in all areas for adjustment, except for the first one, in the first half-period of voltage at the non-adjustable angle β to a controlled valve of the cathode group in the middle circuit of the previous area and in the second half-period - a controlled valve of the anode group in the middle circuit of the previous area. The control pulses at the non-adjustable angle β supplied in each half-period to one respective pair of the controlled valves at the outermost circuits of the respective areas are supplied with time delay regarding the non-adjustable angle β to the value of the opening angle γ1 for the respective controlled valve in the middle circuit of the previous area.

EFFECT: higher power factor for the inverter.

4 dwg

Up!