Power unit of automobile electrical system

FIELD: electricity.

SUBSTANCE: device comprises auxiliary power supply source connected to automobile 12 V accumulator battery, half-bridge transistor converter, current-limiting resistor, current sensor, transformer-rectifying cascade, input filter, output filter, the first and second power amplifiers for transistor control of half-bridge transistor converter, voltage regulator, comparator, RS-trigger and toggle flip-flop, the first and second relays, voltage sensor at positive input terminal of half-bridge transistor converter, the first and second 4OR-NOT logic elements; the device also comprises square-wave generator and power supply source includes step-down PWM-regulator formed by in-series valve and field transistor, and the third power amplifier connected to gate of the field transistor, at that the second output of voltage regulator through indicator is connected to positive terminal of automobile 12 V accumulator battery.

EFFECT: improved power characteristics and expanded functionality of the device.

1 dwg

 

The invention relates to electrical engineering and can be used in the development of high-frequency power supplies with galvanic isolation of the output voltage for vehicles with combined power units.

A device (Vershigora V. A., Ignatov A. P. etc. Car BA3-2108. - M.: DOSAAF, 1986. - 286 p.) in which to power the ignition of the vehicle is used, a synchronous electric motor (motor generator) driven by an internal combustion engine (hereinafter engine).

The disadvantage of this device when using it to power the ignition of cars with a combined power units is a violation of the energy balance in the ignition due to the presence of modes of motion of the vehicle solely on electric power", i.e., when the engine is turned off, and the relatively low efficiency

It is also known device a stabilized power supply, RF patent №2426168, IPC G05F 1/56, publ. 10.08.2011 for ensuring quality supply of power to the load by introducing stabilizing the switching frequency.

The disadvantage of this device is the lack of galvanic isolation of the output voltage.

It is also known device bridge inverter, RF patent №2223590, IPC NM 3/337, NM 7/219, G05F 1/56, publ. 10.02.2004 G. providing power to the load is galvanically isolated voltage�m, moreover, despite the presence in the power circuit single-phase bridge Converter solved the issue of exclusion of the DC component in the primary winding of the output transformer.

The disadvantage of this device is the lack of protection from sudden switching on of power supply, and also low energy performance, due to the use of the PWM control voltage in the primary winding of the output transformer.

The closest technical solution is the on-Board charger, RF patent №2101830, IPC H02J 7/10, NM 7/12, publ. 10.01.1998 G., taken as a prototype, in which the power load is used as the high-frequency half-bridge transistor inverter with galvanic isolation of the output voltage.

The disadvantage of this device is the low energy performance, due to the use of the PWM control voltage in the primary winding of the output transformer.

The invention aims at increasing the energy performance and to enhance the functional properties of the device.

This object is achieved in that in the known device, comprising a source of auxiliary supply connected to the side dvenadcatiletnej battery, half-bridge transistor inverter, the input of which che�ithout current limiting resistor connected to a power source, and exit via the current sensor is connected to the primary winding of the transformer-rectifier cascade connected through an output filter to the side dvenadcatiletnej the battery, the first and second power amplifiers to control the transistor half-bridge transistor inverter, voltage regulator, the input of which is connected to the side dvenadcatiletnej battery, a comparator, an RS-trigger and trigger with the counting input, first and second relays, the first conclusions of the coils which are combined and connected to the positive output of the internal power supply of the second power amplifier, wherein the second output coil of the first relay is connected to the middle pin of the internal power supply of the second amplifier through the normally closed contact of the second relay, a normally-open contact which bypasses the current limiting resistor, and a second terminal of the coil of the second relay connected to the sensor output voltage at the positive input terminal half-bridge transistor inverter, the first and second logic elements ILI IS NOT, the outputs of which are connected to the inputs respectively of the first and second amplifiers, in this case the first inputs of logic elements ILI IS NOT connected through the normally closed contact of the first relay to the middle pin of the internal�of the power supply of the second power amplifier, and through the normally open contact of this relay to the positive terminal of the same power source, the second inputs of logic elements ILI IS NOT connected to the direct output of the RS flip-flop, a third input to the R input of RS flip-flop and to the counting input of the second trigger, the direct output of which is connected to the fourth input of the first logic element ILI-NOT, and an inverse output of the trigger is connected to the fourth input of the second logic element ILI-NOT, the output of the current sensor half-bridge transistor inverter via a comparator connected to the S input of RS flip-flop introduced the generator of rectangular pulses, the output of which is connected to third inputs of the logic elements ILI-NOT, and the power source includes a step-down PWM regulator, formed by series-connected choke and the field-effect transistor, the drain of which is connected to the common connection point of the first terminal of the inductor and the cathode of the diode, and the source of this FET is connected to the positive output terminal of the input filter, the negative output terminal of which is connected to the anode of the diode, wherein the second terminal of the inductor is positive output terminal of the power source and connected to the inverting input of the adder, the non-inverting input of the adder connected to the output of the voltage regulator, and the output of the adder via a relay �element is provided and the third amplifier is connected to the gate field-effect transistor, wherein the second output of the voltage regulator via the indicator is connected to the positive terminal on-Board dvenadcatiletnej battery.

The drawing shows a diagram of the device.

The power supply unit of an onboard network of the car contains the source of the auxiliary supply 1 connected to the side dvenadcatiletnej the battery 2, half-bridge transistor inverter 3, the entrance of which is through a current limiting resistor 4 is connected to a power source 5, and the output through the current sensor 6 is connected to the primary winding of the transformer-rectifier cascade 7 connected through an output filter 8 to the side dvenadcatiletnej the battery 2, the first 9 and second 10 power amplifiers to control the transistor half-bridge transistor inverter 3, the voltage regulator 11, the input of which is connected to the side dvenadcatiletnej the battery 2, the comparator 12, RS-flip-flop 13 and a trigger 14 with the counting input of the first 15 and second 16 relays, the first conclusions of the coils which are combined and connected to the positive output of the internal power supply of the second power amplifier 10, wherein the second output coil To 15.1 first relay 15 is connected to the middle pin of the internal power supply of the second power amplifier 10 through the normally closed contact 16.2 of the second relay 16 normally �uzamknuty contact which bypasses the current limiting resistor 4, and the second output coil To 16.1 of the second relay 16 is connected to the output of the sensor 17, the voltage at the positive input terminal half-bridge transistor inverter 3, the first 18 and second 19 logic elements ILI IS NOT, the outputs of which are connected to the inputs respectively of the first 9 and second 10 power amplifiers, the first inputs of logic elements 18, 19 ILI IS NOT connected through the normally closed contact 15.2 first relay 15 to the middle pin of the internal power supply of the second power amplifier 10, and through the normally open contact of this relay 15 to the positive terminal of the same power source, second inputs of logic elements 18, 19 ILI IS NOT connected to the direct output of the RS flip-flop 13, the third inputs to the R input of RS flip-flop 13 and to the counting input of the second trigger 14, the direct output of which is connected to the fourth input of the first logic element 18 ILI-NOT, and an inverse output of the trigger 14 is connected to the fourth input of the second logic element 19 ILI-NOT, the output of the sensor 6 current half-bridge transistor inverter 3 via the comparator 12 is connected to the S input of RS flip-flop 13. In addition, the power supply of an onboard network of the car contains a generator 20 of rectangular pulses, the output of which is connected to third inputs of the logic elements 18, 19 ILI-NOT, and the power source 5 includes lowering�nd PWM controller, formed by series-connected inductor 21 and the field-effect transistor 22, the drain of which is connected to the common connection point of the first terminal of the inductor 21 and the cathode of the diode 23, and the source of this field-effect transistor 22 is connected to the positive output terminal of the input filter 24, the negative output terminal of which is connected to the anode of the diode 23, wherein the second terminal of the inductor 21 is the positive output terminal of the power source 5 and is connected to the inverting input of the adder 25, the non-inverting input of the adder 25 is connected to the output of the voltage regulator 11, and the output of the adder 25 through the relay element 26 and the third amplifier 27 power connected to the gate field-effect transistor 22, while the second output of the voltage regulator 11 via the indicator 28 is connected to the positive terminal on-Board dvenadcatiletnej battery 2.

The device operates as follows.

In the steady state high voltage with buffer energy storage (hereafter BOE) through the inlet filter 24 is fed to the input of the step-down PWM regulator power supply 5. The PWM controller generates the input half-bridge transistor inverter 3 is reduced in several times a voltage proportional to a given Uz arriving at the non-inverting input of the adder 25 from the output of the voltage regulator 11. From the output of the adder 25 spacing�tion signal between the specified voltage Uz and the current value provides the enable / disable field-effect transistor 22 by a corresponding switching of the relay element 26. As the generator 20 generates a sequence of symmetric pulses with a duty cycle of 0.5 (square wave), the voltage at the terminals of the side dvenadcatiletnej battery 2 strictly proportional to the input voltage half-bridge transistor inverter 3, so the voltage at the terminals of the side dvenadcatiletnej battery 2 is determined by the value of the set voltage UZfrom the output of the voltage regulator 11. The voltage regulator 11 generates a predetermined voltage UZin the function of maintaining the terminals onboard dvenadcatiletnej battery 2 voltage required by the conditions of operation depending on the current values of the load and the ambient temperature. Thus, in the steady state due to the presence of the input voltage half-bridge transistor inverter 3, the sensor 17 to the availability of voltage of the power source 5 supports the second relay 16 in the on state, that is, a current-limiting resistor 4 is shunted normally open contact of the relay and the first relay coil 15 is de-energized. Therefore, the first inputs of the logic elements ILI-NOT 18, 19 receives zero voltage, thereby inhibiting the passage of pulses from generator 20.

Upon initial connection of the power source 5 to the BOE, the charge of the capacitor half-bridge transistor pre�of brazaletes 3 occurs through a current limiting resistor 4, since the sensor 17 of voltage presence have not included the second relay 16. Therefore, the first relay 15 is enabled and block its normally open contact, the passage of control pulses half-bridge transistor inverter 3. After the capacitor half-bridge transistor inverter 3 is charged to the full voltage sensor 17 the presence of voltage includes a second relay 16, continue its normally open contact of the current limiting resistor 4 and thereby disconnecting the first relay 15. Now to the first inputs of the first 18 and second 19 logic elements ILI IS NOT supplied zero voltage, thereby removing the blocking of the passage of the pulses controlling the half-bridge transistor inverter 3. In the initial moment of time the output voltage of the RS-flip-flop 13 is also zero, since the current has not increased to its maximum. The generator 20 generates a sequence of symmetric pulses with a duty cycle of 0.5 (square wave), at a high potential which the transfer of the second trigger 14 in the opposite position and so-called "guaranteed pause", i.e. the prohibition of simultaneous switching half-bridge transistor inverter 3. At low potential at the output of the generator 20 is activated, for example, through the first utilitymodule 9, the upper transistor half-bridge transistor inverter 3. In the primary winding of the transformer-rectifier cascade 7 begins to increase the current. If the voltage of a rechargeable onboard dvenadcatiletnej the battery 2 such that the magnitude of this current reaches the threshold value will trigger the comparator 12 and the output of the RS-flip-flop 13 is set to high potential, whereby the first amplifier 9, and consequently, the power transistor will be turned off. The current will start to decrease, but the RS-flip-flop 13 will remain in the same position until, until you switched leading edge of another pulse generator 20. This will also change the state of the second trigger 14, which will lead to the inclusion of a second power amplifier 10 and the transistor half-bridge transistor inverter 3. The current in the primary winding of the transformer-rectifier cascade 7 will drop to zero and starts to increase in the opposite direction. When he reaches the limit, again will trigger the comparator 12 and turns off the power amplifier 10. Then the process is repeated, providing a charge onboard dvenadcatiletnej battery 2 stable current.

If the voltages on Board are dvenadcatiletnej the battery 2 has reached such a value that the current in �ervices winding transformer-rectifier cascade 7 is not increasing to the limit, the triggering of the comparator 12 does not occur and the duration of the on-state of the transistor half-bridge transistor inverter 3 is determined only by the generator 20.

Sudden disabling and enabling voltage BOE does not affect the algorithm of the power supply operation ignition of the vehicle as the power source 1 own needs connected to the side dvenadcatiletnej the battery 2.

Thus, the proposed device does not have PWM control of voltage in the primary winding of the transformer-rectifier cascade 7, providing the best possible energy performance and output voltage control power supply ignition of the vehicle is done by changing the input voltage half-bridge transistor inverter 3. These changes are provided with step-down PWM regulator power source 5, which is formed by the voltage regulator 11 in the function of maintaining the terminals onboard dvenadcatiletnej battery 2 voltage required by the conditions of operation depending on the current values of the load and the ambient temperature. The second output of the voltage regulator 11 via the indicator 28 is connected to the positive terminal on-Board dvenadcatiletnej battery 2 and signals the inclusion of the Indus�Katara 28 critical increase or decrease the voltage at the terminals onboard dvenadcatiletnej battery 2. As such a controller, you can use one of the commercially available integrated regulators for automotive alternators, for example TC80223×WS company Motorola, pulse output (EXC) which is connected to the positive input of the adder 25 via aperiodic filter, and the second output (LAMP) is connected to the indicator 28.

Power pack ignition of the vehicle, comprising a source of auxiliary supply connected to the side dvenadcatiletnej battery, half-bridge transistor inverter, the input of which through a current limiting resistor connected to a power source, and the output through a current sensor connected to the primary winding of the transformer-rectifier cascade connected through an output filter to the side dvenadcatiletnej the battery, the first and second power amplifiers to control the transistor half-bridge transistor inverter, voltage regulator, the input of which is connected to the side dvenadcatiletnej battery, a comparator, an RS-trigger and trigger with the counting input, first and second relays, first terminals of the coils which are combined and connected to the positive output of the internal power supply of the second power amplifier, wherein the second output coil of the first relay is connected to the middle pin of the internal source�the IR power of the second amplifier through the normally closed contact of the second relay, normally opened contact which bypasses the current limiting resistor, and a second terminal of the coil of the second relay connected to the sensor output voltage at the positive input terminal half-bridge transistor inverter, the first and second logic elements ILI IS NOT, the outputs of which are connected to the inputs respectively of the first and second amplifiers, the first inputs of logic elements ILI IS NOT connected through the normally closed contact of the first relay to the middle pin of the internal power supply of the second power amplifier, and through the normally open contact of this relay to the positive terminal of the same power source, second inputs of logic elements ILI IS NOT connected to the direct output of the RS flip-flop, a third input to the R input of RS flip-flop and to the counting input of the second trigger, the direct output of which is connected to the fourth input of the first logic element ILI-NOT, and an inverse output of the trigger is connected to the fourth input of the second logic element ILI-NOT, the output of the current sensor half-bridge transistor inverter via a comparator connected to the S input of RS flip-flop, characterized in that the power supply ignition of the vehicle further comprises a generator of rectangular pulses, the output of which is connected to third inputs of the logical e�elements ILI-NOT, and the power source includes a step-down PWM regulator, formed by series-connected choke and the field-effect transistor, the drain of which is connected to the common connection point of the first; the terminals of the inductor and the cathode of the diode, and the source of this FET is connected to the positive output terminal of the input filter, the negative output terminal of which is connected to the anode of the diode, wherein the second terminal of the inductor is positive output terminal of the power source and connected to the inverting input of the adder, the non-inverting input of the adder connected to the output of the voltage regulator, and the output of the adder via the relay element and the third power amplifier is connected to the gate field-effect transistor, wherein the second output of the voltage regulator via the indicator is connected to the positive terminal on-Board dvenadcatiletnej battery.



 

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3 dwg

FIELD: physics, optics.

SUBSTANCE: invention relates to a device for driving a light-emitting diode (LED), an apparatus having said device and a method of driving a LED. In the first object, the disclosed device comprises an output stage for feeding current to the LED, wherein the current has an average value and a peak value, wherein the peak value, divided by the average value, forms a ratio, and an input stage for receiving a signal from a power supply unit, wherein the input stage includes a tool, having a resonance circuit for reducing the ratio through a frequency component to the signal or adaptation of the frequency component of the signal, which improves efficiency of the LED. According to the second object, in the method on the output stage, current is fed to the LED, wherein the current has an average value and a peak value, wherein the peak value, divided by the average value, forms a ratio, and an input stage for receiving a signal from a power supply unit, wherein the input stage includes a tool, having a resonance circuit for reducing the ratio by adding a frequency component to the signal or adaptation of the amplitude of the frequency component of the signal, which improves efficiency of the LED.

EFFECT: designing a device for driving a LED with high efficiency.

13 cl, 4 dwg

FIELD: electricity.

SUBSTANCE: device contains the first and second transistors which bases are united and connected to the device output, the first resistor, an emitter of the first resistor, a common bus, the second resistor, an emitter of the second resistor, the first output of the second resistor, the third resistor, the second output of the second resistor, a current repeater, the third transistor, a collector of the second resistor, a connection point of the first transistor collector, a base of the third transistor, a feed input of the current repeater, a power bus, a collector of the third transistor.

EFFECT: simplification of scheme with high temperature stability of output voltage.

4 dwg

FIELD: electricity.

SUBSTANCE: invention relates to converting equipment and can be used for development of power supplies for various equipment. The voltage converter powered from DC power supply is offered which contains current and voltage sensors, a contactor, a power transistor connected in series with the contactor contact and resistor shunted, step-up regulator based on two power keys and two diodes, DC/DC converter based on a halfbridge and two series connected capacitors, a power transformer, an output capacitance and resistance loaded rectifier, and a control unit.

EFFECT: technical result consists in failure protection of power keys at increase of voltage and current through them that is implemented by means of a certain sequence of switchings of power keys and the contactor from the control unit.

1 dwg

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