Redundant direct current stabiliser

FIELD: electricity.

SUBSTANCE: invention refers to electric engineering and can be applied in spacecrafts for current limitation in electric power supply system of solar battery panel opening for a drive opened to the limits. Redundant DC stabiliser includes control element (CE) connected in series with current sensor and load and based on four n-channel MIS transistors connected in parallel and in series, negative CE output connected via current sensor to common power supply bus and positive output connected via load to positive power supply bus; four identical control circuits (CC) of CE MIS transistors are added; each CC output is connected to gate of separate MIS transistor of CE; negative power supply output of each CC is connected to common power supply bus and positive output is connected to positive power supply bus; gauge input of each CC is connected to the point of CE connection with current sensor; each CC includes input non-inverting amplifier with its input connected to CC gauge input and output connected to inverting input of output amplifier (OA), output of which is connected to CC output; reference voltage source with its output connected to non-inverting input of OA; power supply pulse generator with its output connected to inverting OA input.

EFFECT: improved reliability of DC stabiliser.

1 dwg

 

The invention relates to electrical engineering and can be used in space vehicles to limit the current in the power supply system of the actuator disclosure solar panels when opening the drive until it stops.

Known current regulator containing a source of reference voltage, the first and second transistors of one conductivity type, the emitters of which are connected respectively with the first findings of the first and second resistors, a collector connected to the output terminals, the third and fourth transistors of this type conductivity as the first and the second, fifth and sixth transistors of the opposite type conductivity, the third resistor, the emitters of the third and fourth transistors integrated and connected to the first pole of the source of the reference voltage, the collectors of the second and conclusions, respectively, first and second resistors, a base connected respectively to the bases of the fifth and sixth transistors, the emitters of which the United and through the third resistor is connected to the second pole of the source of the reference voltage and the collectors to the bases respectively of the first and second transistors (SU 1460715).

However, this device is not reliable enough, since the failure of the transition base-collector of any transistor device fails, in addition, a stabilized current can not exceed the gas current of the transistor 2 (1); the device requires galvanically isolated secondary power supply 7, which increases its size and reduces reliability.

Closest to the proposed to the technical essence is the stabilizer DC, containing included in a potential tire relative to a common bus connected in series regulating transistor element and the sensor load current, differential DC amplifier, the inverting input of which is connected to the current sensor, the non-inverting input is connected to the positive output of the voltage reference and the output is connected to a control input of the regulating element, while the negative output of the voltage reference is connected to the potential output output stabilizer, auxiliary reference voltage source, the negative output of which is connected to the output potential of the regulator, resistor voltage divider connected between the positive output auxiliary source reference voltage and a common bus, the transistor protection, the collector of which is connected to the control input of the regulating element, the emitter is connected to the output of the regulating element and the base circuit is connected to the center pin of resistor voltage divider, and capacitive delay circuit, connected to BA the new circuit of the transistor protection (SU 1385126), selected as a prototype.

The disadvantages of the prototype are (see the drawing to the invention SU 1385126): a large voltage drop across the current sensor 2, is equal to a reference voltage source 4, which reduces the voltage at the load and the allocation of power to the current sensor; insufficient reliability due to two factors: firstly, the presence of additional secondary power supply with galvanic isolation from UBXthat, as a rule, have the control scheme key elements of a transformer, rectifier diodes, smoothing LC-filters, i.e. contain many elements, which reduces reliability; secondly, failure to break the regulating element 1 load remains without power, and in case of failure of the regulatory element of type "short circuit" to the load served increased current and it can be out of order, to return the circuit to its original state after overloading for a short time off, and then re-enable the stabilizer, which means we need an additional device or operator.

The aim of the invention is to improve the reliability.

This objective is achieved in that the redundant regulator constant current regulating element (re) 1, connected in series with the current sensor and the load, performed on four n-the anal MOS transistors, connected in parallel-series, the negative output OM 1 through the current sensor 2 is connected to the common power bus and positive through the load 3 to the positive power bus; put four identical control circuit (SU) 4-7 MOS transistors ER 1; the output of each SU is connected to the gate of the individual MOS transistor ER 1; the negative output power of each SU is connected to the common power bus and positive to the positive power bus; a measuring input of each SU is connected to the connection point re 1 current sensor 2; each SU contains: non-inverting input of the amplifier 8, whose input is connected to the measuring input of the SU, and the output to the inverting input of the output amplifier (WU) 9, the output of which is connected to the output of the SU; the reference voltage (ION) 10, the output of which is connected to reinvestiruet entrance WU 9; shaper pulse power (PHI) 11, the output of which is connected to the inverting input VU 9.

The figure shows a functional diagram of the redundant stabilizer DC.

Redundant stabilizer DC contains: ER 1, performed on four n-channel MOS transistors connected in parallel-series, the negative output ER through the current sensor 2 is connected to the common power bus and positive through the load 3 to the positive power bus; four Odie is W hat management scheme (SU) 4-7 MOS transistors ER 1; the output of each SU is connected to the gate of the individual MOS transistor ER 1; the negative output power of each SU is connected to the common power bus and positive to the positive power bus; a measuring input of each SU is connected to the connection point re 1 current sensor 2; each SU contains: input non-inverting amplifier, whose input is connected to the measuring input of the SU, and the output to the inverting input of the output amplifier (WU) 9, the output of which is connected to the output of the SU; reference voltage source 10, the output of which is connected to nevertrust entrance WU 9; a pulse shaper for the power supply 11, the output of which is connected to the inverting input VU 9.

The device operates as follows: when power is supplied to the driver 11 generates a short pulse of low level to the inverting input WOO 9 and the outputs of all SU appears the high-level voltage and re 1 is fully open, providing load 3 (electrical) required starting current.

When the load current is less than the current stabilization (restrictions):

ICT=UAboutPR2K8(1)

where ICT-current stabilization of the mouth of the STS;

UOP- voltage of the reference voltage;

R2 is the resistance of the sensor current;

K8 - gain amplifier 8.

The output voltages of all the SU will have a high level because the voltage on the inverting input WOO 9 is less than the reference voltage; decreasing the resistance of the load, the current through it does not exceed the value of ICT(see (1)) due to the reduction of the output voltages of all the SU, because the voltage at the output of the amplifier 8 starts at a small value to exceed the reference voltage, and output voltage VU 9 decreases and MOSFET transistors in re 1 key mode is transitioned to the active mode, i.e. begin to stabilize the voltage U2the current sensor 2, is equal to:

U2=ICTR2=UAboutPK8(2)

In the proposed device is eliminated a large voltage drop on the current sensor 2, which can be made arbitrarily small by increasing K8, see expression (2). The reliability of the device is improved by eliminating galvanically isolated secondary power source and application redundancy, including sensor t is ka, which is made for the parallel connection of several resistors(resistors depends on the required accuracy of the current stabilization) and, thus, failure of any element does not cause malfunction of the device.

It was made 20 devices, they differed a good repeatability, high accuracy current stabilization. The devices are assembled on the elements: P B2, URS, ART, C2-33, C2-29 C.

From the known to the applicant of patent information materials are not signs of a similar set of features of the claimed object.

Redundant stabilizer DC containing the regulatory element (re), connected in series with the current sensor and the load, characterized in that ER performed on four n-channel MOS transistors connected in parallel-series, the negative output ER through the current sensor is connected to the common power bus and positive through the load to the positive power bus; put four identical control circuit (SU) MOS transistors ER; the output of each SU is connected to the gate of the individual MOS transistor ER; the negative output power of each SU is connected to the common power bus, and a positive - to the positive power bus; a measuring input of each SU is connected to the connection point of the ER with the current sensor; each SU contains: I the ne non-inverting amplifier, an input connected to the measuring input of the SU, and the output to the inverting input of the output amplifier (WU), the output of which is connected to the output of the SU; the source of the reference voltage, the output of which is connected to reinvestiruet entrance WU; a pulse shaper according to the power supply, the output of which is connected to the inverting input of WU.



 

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