Dc voltage stabiliser

FIELD: electricity.

SUBSTANCE: direct-current voltage converter comprises control field-effect transistor, which gate is shunted by parallel circuit from counterconnected first diode and first resistor while its drain is connected to anode connection point of switching diode and the first output of choke, which second output is connected to the first input pin joined to source of the control field-effect transistor and the first output pin connected through output capacitor to cathode connection point of switching diode, the second output pin and the first output pin of the output voltage divider, which second output is connected to the first output pin meanwhile the midpoint is connected to measuring input of the control unit, which common leg is connected to the first output pin, emitter follower, which output pin is connected to the first output of the second resistor. The circuit is featured by introduction of a coupling capacitor connected between the second output of the second resistor and gate of the field-effect transistor, the first transistor with load resistor in the collector circuit and auxiliary capacitor connected between outputs of the collector and emitter of the first transistor, which base is connected to output pin of the control unit, emitter is connected to the first output pin while collector - to input pin of the emitter follower. At that in the suggested device the control unit may consist, for example, of pulse generator, which output is coupled to input of saw-tooth voltage shaping unit and to the first input of comparator circuit, which second input is coupled to output of saw-tooth voltage shaping unit and its third input is coupled to output of feedback amplifier, which input is connected to input pin of the control unit and its second input is connected to output of the reference element. In operating mode at large pulse ratio of control voltage at the gate of field-effect transistor (low duration of gating pulses) due to introduction of an auxiliary capacitor the control field-effect transistor starts operation in linear mode limiting reduction in duration of control voltage thus preventing loss in stability of regulation by DC voltage stabiliser.

EFFECT: reliability improvement.

3 cl, 3 dwg

 



 

Same patents:

FIELD: electricity.

SUBSTANCE: invention relates to the field of electrical equipment and can be used in digital control systems of DC voltage converters with the function of suppression of the hazardous oscillations of output voltage occurring at a certain set of parameters of the system. In the nonlinear dynamics control system the control system consisting of the main subsystem and the control auxiliary subsystem, approximators on the basis of neural networks is connected to the power part of the converter. The converter control signal provides the stabilization of average value of output voltage. In the system the correction of error signal is provided, thus the stabilization of the design dynamic mode (1 cycle) is provided.

EFFECT: ensuring of pre-set nonlinear dynamic properties of the system and pre-set parameters of speed and accuracy of output voltage stabilization in case of refusal from parametrical synthesis.

3 dwg

FIELD: electricity.

SUBSTANCE: step-up voltage converter comprises an input circuit with a choke in one of branches, two power keys, two diodes, and a starting key with a resistor shunting it and two in-series output capacitors. In order to improve reliability of semiconductor elements and prevention of the core saturation upon supply of input voltage should be performed in four stages. Unbalanced conditions of the converter operation are eliminated by introduction into the scheme of two auxiliary keys controlled by two auxiliary drivers and two operating amplifiers (OA). A resistor is connected in series with each auxiliary key and each operating amplifier contains series circuits, which consist of a diode and resistor thus ensuring hysteresis of connection and disconnection of the auxiliary keys.

EFFECT: high reliability.

5 dwg

FIELD: electricity.

SUBSTANCE: invention is a device with supply from a solar battery, which includes a battery, at least one photoelectric element (which may be a part of a solar module comprising multiple photoelectric elements) and a DC-perceptive AC device, such as a compact fluorescent lamp. The device with supply from a solar battery may also include the first DC-DC converter, which receives the first electric signal from at least one photoelectric element and provides a charging signal to a battery, and the second DC-DC converter, which receives the second electric signal from a battery and provides for a DC signal of DC supply to the DC-perceptive AC device.

EFFECT: higher efficiency factor.

19 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: protection circuit of the power supply unit of a dc voltage apparatus is installed at the output of the power supply unit, and between the positive terminal (3) of the power supply unit and the positive terminal (1) of said apparatus there is a switching element (S1) and an inductor (L1), which is connected between the switching element (S1) and the positive output terminal (1), wherein the inductor (L1) on its side connected to the positive output terminal (1) is also connected to the an output capacitor (C2), and the side of the inductor (L1) connected to the switching element (S1) is connected to a diode (D1), which is connected in parallel to the output capacitor (C2) n the cathode side, and there is also a device for controlling the switching element (S1), which includes the switching element (S1) depending on current measured in the protection circuit.

EFFECT: designing an apparatus which, as a result of connecting units when the apparatus is operating, the absence of current harmonics is determined, and therefore undervoltage on the conductor line.

16 cl

FIELD: electricity.

SUBSTANCE: in a stabiliser, comprising an input capacitor, a transistor, a diode, a throttle, a current sensor and an output capacitor, parallel to the input capacitor there are the following components connected in series - an upper stabilitron, a current stabiliser and a lower stabilitron, joined to a negative pole of the input capacitor, parallel to the upper stabilitron there are the following components connected - an interlocking device, connected to an upper comparator, an operational amplifier and a reference voltage divider, a sawtooth oscillator, an upper comparator and an operational amplifier, and a bridge circuit is connected in parallel to the lower stabilitron, including a transistor of an optical transistor and three resistors, and also a lower comparator. At the same time devices are used for galvanic isolation of control elements.

EFFECT: expansion of input voltage range, simplification, reduced cost, increased reliability and convenience of the stabiliser operation.

4 cl, 5 dwg

FIELD: radio engineering.

SUBSTANCE: voltage switching unit with protection against current overload includes electronic switch which supplies the power to load unit and to overload freezing unit. Overload freezing unit freezes the activation of electronic switch at initial supply of input voltage and provides the deactivation of electronic switch when the current is higher than the specified one. Additionally introduced shaper of delayed pulse unlocks the electronic switch, provides the specified delay relative to the supply of input voltage.

EFFECT: improving reliability of the device owing to excluding the current stabilisation mode at any kinds and modes of load, and enlarging functional capabilities owing to tuning of current commutation time relative to supply of input voltage.

2 cl, 4 dwg

FIELD: electrical engineering.

SUBSTANCE: integrated power supply voltage converter is intended for efficient conversion of power supply voltage for low-capacity and low-voltage devices that operate from batteries and accumulators to voltages that are less than voltages of chemical power supply sources. Circuit of integrated power supply voltage includes the following components: substrate for circuit arrangement, output unit connected to power supply source and generating output signal, control unit, which controls output unit by means of feedback, unit of low-frequency filter, function of which is to level output signal received from output unit, control unit is equipped with source of reference voltage, voltage divider, clock signal generator and error detector, besides voltage divider transforms signal from reference voltage source and sends it to input of error detector, where signal is also supplied from output unit as well, and further from error detector control signal arrives to permitting input of clock signal generator, and output unit is arranged as based on switched capacitors in the form of two cascades connected in parallel, the first of which comprises capacitor (17), one p-channel transistor (18) and three n-channel transistors (19, 20, 21), the second cascade comprises capacitor (22), p-channel transistor (23) and three n-channel transistors (24, 25, 26), besides transistors of output unit cascades are controlled by two paraphrase signals from clock signal generator "input 1" and "input 2" so that "input 2" signal is sent to transistors (18, 20, 21) and (24), and signal "input 1" is sent to transistors (19, 23, 25, 26), transistors are connected so that depending on level of "input 1" and "input 2" signals, which may either be high or low, at the moment of time, when "input 1" signal is of high level, and signal "input 2" is of low level, current passes through transistors (18, 19) and capacitor (17) from power supply source to output, besides capacitor (17) is in charging phase, and through transistors (25, 26) and capacitor (22) from common bus to output, besides, capacitor (22) is in discharging phase, and at the moment of time, when "input 1" signal is of low level, and signal "input 1" is of high level, current passes through transistors (20), (21) and capacitor (17) from common bus to output, besides, capacitor (17) is in discharging phase, and through transistors (23, 24) and capacitor (22) from power supply source to output, besides capacitor (22) is in charging phase, and at the same time, both in charging or discharging phase of capacitors (17) and (22) current flows in one direction towards outlet of output unit.

EFFECT: achievement of low output voltages and improved efficiency factor at low energy consumption.

7 dwg

FIELD: electrical engineering.

SUBSTANCE: proposed diode-transistor bridge relates to electrical engineering, particularly to electrical machines and can be used in structural couplings with magnetic bearings. Diode-transistor bridge comprises supply diagonal and load diagonal incorporating at least one inductor coil (8). Note that throttle (7) is additionally included in load diagonal, RC-circuit (9) being connected in parallel to said throttle. Capacitor (12) and power source are connected in said supply diagonal, the latter being connected via separating diode (13). Transistors (5,6) connected into bridge arms have no common connection point. Storage capacitor (12), throttle (7) with RC-circuit (9) and separating diode (13) connected in the diode-transistor bridge in proposed manner, allows a notable reduction in consumed power of the bridge, diametre of conductors connected to power supply and its overall dimensions.

EFFECT: higher reliability, reduced dependence of source weight-and-size upon consumed power.

1 dwg

FIELD: electricity.

SUBSTANCE: in method of load supply from a solar battery an up-converter is used and switching of its key elements is carried out by synchronising and control signals; output characteristic of the converter is measured and control signal is generated as a signal equivalent to duty cycle of the power key.

EFFECT: increasing quantity of energy taken from a solar battery.

2 dwg

FIELD: electricity.

SUBSTANCE: control method involves use of similar modules switched in control chains either to a drive or driven module modes; besides, in the drive module there used is additional feedback as to current of capacitors of output filters of modules. In case of failure of any of the modules, it is disconnected from load and the primary power network, and an operating mode of each module, if required, is changed by means of switches. In order to change over the driven module to the drive module operation, a signal is supplied to its input, which is obtained by switching an input chain from the setting signal of current to sine-shaped voltage signal, from which the connected signal of the main feedback as to voltage and total current signal of capacitors of output filters of modules is deducted. At the same time, a current signal of the drive module is connected to a common control bus of output current of the drive module. When an additional module is being introduced to an uninterrupted power source, first, it is set to a drive module mode, and then it is switched over to a driven module mode.

EFFECT: improving reliability of an uninterrupted power supply system with AC output and its scalability.

3 dwg

FIELD: electricity.

SUBSTANCE: device for providing parallel operation of independent inverters includes the first and the second independent inverters, single-phase-three-phase transformer with rotary magnetic field with four primary windings and one three-phase secondary winding, the first and the second phase-shifting capacitors, control system containing pulse shaper, master saw-tooth voltage generator and distributing device. Input of transformer-rectifier unit is connected to load, and its output is connected to the first input of pulse shaper the second input of which is connected to the output of master saw-tooth voltage generator. Output of pulse shaper is connected to the input of distributing device, the first and the second outputs of which are the outputs of control system.

EFFECT: voltage stabilisation at parallel operation of single-phase independent inverters to three-phase load.

2 dwg

FIELD: automatic control systems.

SUBSTANCE: method intends for controlling voltage of power limited constant current sources and for controlling secondary sources operating from current sources, for example, solar batteries. Commutation of key elements of increasing converter is carried out by synchronizing and controlling signals. Control signal is formed on the base of sum of error signal and sweep signal. Current of throttle (power source) and output current of converter are measured. Sweep signal is formed to be proportional to difference of saw-shaped signal with amplitude being equal to current signal of power source and of signal being equal to output current of converter.

EFFECT: widened functional abilities due to its propagation to increasing converters.

1 dwg

FIELD: automatic control systems.

SUBSTANCE: method intends for controlling voltage of power limited constant current sources and for controlling secondary sources operating from current sources, for example, solar batteries. Commutation of key elements of increasing converter is carried out by synchronizing and controlling signals. Control signal is formed on the base of sum of error signal and sweep signal. Current of throttle (power source) and output current of converter are measured. Sweep signal is formed to be proportional to difference of saw-shaped signal with amplitude being equal to current signal of power source and of signal being equal to output current of converter.

EFFECT: widened functional abilities due to its propagation to increasing converters.

1 dwg

FIELD: electricity.

SUBSTANCE: device for providing parallel operation of independent inverters includes the first and the second independent inverters, single-phase-three-phase transformer with rotary magnetic field with four primary windings and one three-phase secondary winding, the first and the second phase-shifting capacitors, control system containing pulse shaper, master saw-tooth voltage generator and distributing device. Input of transformer-rectifier unit is connected to load, and its output is connected to the first input of pulse shaper the second input of which is connected to the output of master saw-tooth voltage generator. Output of pulse shaper is connected to the input of distributing device, the first and the second outputs of which are the outputs of control system.

EFFECT: voltage stabilisation at parallel operation of single-phase independent inverters to three-phase load.

2 dwg

FIELD: electricity.

SUBSTANCE: control method involves use of similar modules switched in control chains either to a drive or driven module modes; besides, in the drive module there used is additional feedback as to current of capacitors of output filters of modules. In case of failure of any of the modules, it is disconnected from load and the primary power network, and an operating mode of each module, if required, is changed by means of switches. In order to change over the driven module to the drive module operation, a signal is supplied to its input, which is obtained by switching an input chain from the setting signal of current to sine-shaped voltage signal, from which the connected signal of the main feedback as to voltage and total current signal of capacitors of output filters of modules is deducted. At the same time, a current signal of the drive module is connected to a common control bus of output current of the drive module. When an additional module is being introduced to an uninterrupted power source, first, it is set to a drive module mode, and then it is switched over to a driven module mode.

EFFECT: improving reliability of an uninterrupted power supply system with AC output and its scalability.

3 dwg

FIELD: electricity.

SUBSTANCE: in method of load supply from a solar battery an up-converter is used and switching of its key elements is carried out by synchronising and control signals; output characteristic of the converter is measured and control signal is generated as a signal equivalent to duty cycle of the power key.

EFFECT: increasing quantity of energy taken from a solar battery.

2 dwg

FIELD: electricity.

SUBSTANCE: direct-current voltage converter comprises control field-effect transistor, which gate is shunted by parallel circuit from counterconnected first diode and first resistor while its drain is connected to anode connection point of switching diode and the first output of choke, which second output is connected to the first input pin joined to source of the control field-effect transistor and the first output pin connected through output capacitor to cathode connection point of switching diode, the second output pin and the first output pin of the output voltage divider, which second output is connected to the first output pin meanwhile the midpoint is connected to measuring input of the control unit, which common leg is connected to the first output pin, emitter follower, which output pin is connected to the first output of the second resistor. The circuit is featured by introduction of a coupling capacitor connected between the second output of the second resistor and gate of the field-effect transistor, the first transistor with load resistor in the collector circuit and auxiliary capacitor connected between outputs of the collector and emitter of the first transistor, which base is connected to output pin of the control unit, emitter is connected to the first output pin while collector - to input pin of the emitter follower. At that in the suggested device the control unit may consist, for example, of pulse generator, which output is coupled to input of saw-tooth voltage shaping unit and to the first input of comparator circuit, which second input is coupled to output of saw-tooth voltage shaping unit and its third input is coupled to output of feedback amplifier, which input is connected to input pin of the control unit and its second input is connected to output of the reference element. In operating mode at large pulse ratio of control voltage at the gate of field-effect transistor (low duration of gating pulses) due to introduction of an auxiliary capacitor the control field-effect transistor starts operation in linear mode limiting reduction in duration of control voltage thus preventing loss in stability of regulation by DC voltage stabiliser.

EFFECT: reliability improvement.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: device containing a regulating field-effect transistor, a switching diode, a choke which output is connected to the input terminal, an input filter capacitor, an output filter capacitor, an output voltage divider connected between the output terminals, and its midpoint is connected to the measuring input of the control unit, the output of which is connected to the base of the first transistor, in parallel to which the first capacitor is connected, an emitter follower connected through a serial RC circuit with a gate of the regulating field-effect transistor, according to the invention the second transistor is inserted, the collector and emitter of which are connected in parallel to the collector and emitter of the first transistor, and the base - to the second output terminal of the control unit formed by the output terminal of the pulse stretcher which input is connected to the pulse generator output. The pulse stretcher is made on the basis of a logical AND circuit. The feedback amplifier is made according to the differential amplifier circuit. This allowed to achieve the invariance of the output voltage of the stabiliser and thereby improve the reliability of the system operation for stabilizing the output voltage when subjected to significant leaping fluctuations in the input voltage.

EFFECT: increased reliability of the DC voltage stabiliser.

3 cl, 2 dwg

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