CN109617404B - Multi-output power module for space storage battery management - Google Patents

Multi-output power module for space storage battery management Download PDF

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Publication number
CN109617404B
CN109617404B CN201811545088.XA CN201811545088A CN109617404B CN 109617404 B CN109617404 B CN 109617404B CN 201811545088 A CN201811545088 A CN 201811545088A CN 109617404 B CN109617404 B CN 109617404B
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triode
circuit
resistor
voltage
diode
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CN109617404A (en
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李玲
胡斌
冯利军
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Cetc Blue Sky Technology Co ltd
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CETC 18 Research Institute
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/26—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes without control electrode or semiconductor devices without control electrode to produce the intermediate ac
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The invention discloses a multi-output power module for space storage battery management, which comprises a main topological circuit, a feedback control circuit, a pulse judgment circuit, a pulse generation circuit and a protection circuit, wherein the main topological circuit comprises a voltage reduction circuit, a push-pull circuit and a rectification filter circuit which are sequentially connected, the input end of the feedback control circuit is electrically connected with the output end of the push-pull circuit and the output end of the protection circuit, and the output end of the feedback control circuit is electrically connected with the voltage reduction circuit. The input end of the pulse judging circuit is electrically connected with the output end of the push-pull circuit, and the pulse judging circuit and the output end are electrically connected with the input end of the pulse generating circuit. The output end of the pulse generating circuit is electrically connected with the input end of the push-pull circuit. The multi-output power module for space storage battery management provided by the invention has the advantages that aiming at the condition that the power consumption of a storage battery management unit is low, a triode is used as a main power switch, high-power devices such as an MOSFET (metal oxide semiconductor field effect transistor) and the like are not used, a power control chip is not used, the cost is saved, and the design is simplified.

Description

Multi-output power module for space storage battery management
Technical Field
The invention belongs to the technical field of space power supplies, and particularly relates to a multi-output power supply module which is high in intelligence and reliability and is suitable for storage battery management of various track space products.
Background
The important energy storage power source of the satellite power supply system is a lithium ion storage battery pack which is formed by connecting a plurality of lithium batteries in series and in parallel. At present, the common modes are that 7 sections, 9 sections, 24 sections are connected in series and the like. In a novel intelligent monitoring integrated system for a storage battery pack, each storage battery management unit module corresponds to a parallel storage battery combination (hereinafter, referred to as a storage battery for short), as shown in fig. 1, so that each storage battery management unit needs to supply power independently.
The multi-output power module for space storage battery management is an important component of a space storage battery intelligent monitoring integrated system, provides reliable and sufficient energy for the storage battery intelligent monitoring integrated system (such as each storage battery management unit therein) all the time, ensures the normal work of the storage battery intelligent monitoring integrated system, and is an indispensable key technology for the lithium ion battery balanced management for long-life space products.
At present, the multi-output power module is mostly three-way output, and at most five-way output. And complex devices such as high-power devices such as MOSFET and power control chips are used. Because a storage battery management unit module corresponds to a storage battery, the multi-output power supply module used by the storage battery intelligent monitoring integrated system needs to be determined according to the number of the storage battery series-connected nodes, the more the storage battery series-connected nodes are, the more the number of the circuits needing to be output by the multi-output power supply module is, and the higher the safety requirement of the multi-output power supply module is. A multi-output power module for the intelligent monitoring integrated system of the space storage battery is not developed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multi-output power module for space storage battery management, which realizes multi-output control through a feedback control quantity by adopting a step-down + push-pull + post-stage rectification cascade topology, and achieves the effect of consistent and stable output voltage.
A multi-output power module for space storage battery management comprises a main topology circuit, a pulse judging circuit and a pulse generating circuit, wherein the main topology circuit comprises a voltage reducing circuit, a push-pull circuit and a rectification filter circuit which are sequentially connected, the input end of the pulse judging circuit is electrically connected with the output end of the push-pull circuit, the output end of the pulse judging circuit is electrically connected with the input end of the pulse generating circuit, and the output end of the pulse generating circuit is electrically connected with the input end of the push-pull circuit.
The technical scheme is preferable, the power supply further comprises a protection circuit and a feedback control circuit, wherein the input end of the protection circuit is electrically connected with the main topology circuit, the input end of the feedback control circuit is electrically connected with the output end of the push-pull circuit and the output end of the protection circuit respectively, and the output end of the feedback control circuit is electrically connected with the voltage reduction circuit.
Preferably, in the above technical solution, the voltage reducing circuit includes a triode Q3, the bus is filtered by a bus filter circuit and then connected to one end of a resistor RS, the other end of the resistor RS is electrically connected with the push-pull circuit, the emitting electrode of the triode Q3 is grounded, the base electrode of the triode Q3 is electrically connected with the feedback control circuit, the collector electrode of the triode Q3 is connected with one end of an inductor, the other end of the inductor is electrically connected with the push-pull circuit, a first diode and a second diode are sequentially connected between one end of the resistor RS and one end of the inductor, the anode of the first diode is connected with one end of the inductor, the cathode of the first diode is connected with the anode of the second diode, the negative electrode of the second diode is connected with one end of the resistor RS, and a capacitor C8 is connected between the other end of the resistor RS and the other end of the inductor.
Above technical scheme is preferred, the push-pull circuit includes triode Q1 and triode Q2, triode Q1 and triode Q2's base respectively with the pulse produces the circuit electricity and is connected, the other end of inductance respectively with triode Q1 and triode Q2's projecting pole and third diode and fourth diode's positive pole are connected, the push-pull circuit still includes secondary transformer, secondary transformer's primary coil is equipped with the intermediate junction, the other end of resistance RS with the intermediate junction of primary coil is connected, the third diode with the negative pole of fourth diode respectively with the both ends of primary coil are connected, secondary transformer is equipped with first secondary winding and second secondary winding, first secondary winding is equipped with the intermediate junction, the intermediate junction ground connection of first secondary winding, the both ends of first secondary winding are connected with the positive pole of fifth diode and sixth diode respectively, the voltage output by the cathodes of the fifth diode and the sixth diode is a first feedback voltage, the cathodes of the fifth diode and the sixth diode are connected in series with a capacitor C7 and then grounded, the voltage output by the upper end of the first secondary coil after being connected in series with a capacitor C6 and a resistor Rb is a second feedback voltage, and the resistor Rb is connected in series with a capacitor C4 and then grounded; the second secondary coil is connected with a plurality of three-level transformers, and the output ends of the three-level transformers, a plurality of tail end diodes and capacitors form a plurality of rectifying and filtering circuits to output final required voltage.
Preferably, in the above technical solution, the first feedback voltage is connected to two different groups of voltage dividing resistors to divide voltage to form a first feedback voltage and a second feedback voltage, the first feedback voltage and the second feedback voltage are electrically connected to the pulse determination circuit, the pulse determination circuit includes a first comparator, a second comparator, a seventh diode, an eighth diode, and a hysteresis control circuit, the first feedback voltage and the reference voltage are compared by the first comparator and then connected to a cathode of the seventh diode, the second feedback voltage and the reference voltage are compared by the second comparator and then connected to a cathode of the eighth diode, anodes of the seventh diode and the eighth diode and a divided voltage of the reference voltage are respectively connected to an input terminal of the hysteresis control circuit, and an output terminal of the hysteresis control circuit outputs a pulse control signal, the pulse control signal is connected with the pulse generating circuit.
Preferably, in the above technical solution, the pulse generating circuit includes a transistor Q4 and a transistor Q5, a base of the transistor Q4 is connected to one end of a resistor R5, one end of a resistor R4 and one end of a resistor R2, another end of the resistor R4 is connected to one end of a capacitor C2, a collector of the transistor Q5 is connected to another end of the capacitor C2, another end of the resistor R2 and one end of an inductor L2, a base of the transistor Q5 is connected to one end of a resistor R6, one end of a resistor R3 and one end of a resistor R1, another end of the resistor R3 is connected to one end of a capacitor C1, a collector of the transistor Q4 is connected to another end of the capacitor C1, another end of the resistor R1 and one end of an inductor L1, another end of the inductor L1 and another end of the inductor L2 are connected to the first feedback voltage, and an emitter of the transistor Q4 is connected to the first feedback voltage, The emitter of the triode Q5, the other end of the resistor R5, the other end of the resistor R6 and one end of the capacitor C3 are respectively connected with the output end of the pulse judging circuit, the other end of the capacitor C3 is grounded, the other end of the capacitor C2 is connected with the base of the triode Q2, and the other end of the capacitor C1 is connected with the base of the triode Q1.
Preferably, in the above technical solution, the protection circuit includes a triode Q6, a triode Q7, a triode Q8, a triode Q9, a triode Q10, and a triode Q11, the bus is filtered by a bus filter circuit and then connected with an emitter of the triode Q6 after being connected in series with a resistor R7, the bus is filtered by a bus filter circuit and then connected with an emitter of the triode Q7 after being connected in series with a resistor R21 and a resistor R8, the bus is filtered by a bus filter circuit and then connected with an emitter of the triode Q8, a base and a collector of the triode Q6 and a base of the triode Q7 are connected in series with a resistor R9 and then connected with a collector of the triode Q11, a collector of the triode Q7 is connected in series with a resistor R10 and then connected with a collector of the triode Q11, an emitter of the triode Q11 is connected with a resistor R16 and then grounded, a collector of the triode Q7 is connected with a base of the triode, the triode Q8 has its collector series resistor R12 connected to the emitter of the triode Q9, the bus filtered by the bus filter circuit and the voltage divided by the series resistor R11 being the input voltage undervoltage protection control point, the input voltage undervoltage protection control point series resistor R13 connected to the emitter of the triode Q9, the base of the triode Q9 connected to the input voltage undervoltage protection control point, the input voltage undervoltage protection control point series resistor R14 connected to the ground, the collector series resistor R15 of the triode Q9 connected to the base of the triode Q10, the base series resistor R18 of the triode Q10 connected to the ground, the base series capacitor C5 of the triode Q10 connected to the emitter of the triode Q10, the first feedback voltage connected to the collector of the triode Q10, the first feedback voltage series resistor R17 dividing the voltage to form the output voltage of the protection circuit, the protection circuit output voltage is connected with an emitter of the triode Q10, the protection circuit output voltage series resistor R20 is grounded, the emitter series resistor R19 of the triode Q10 is grounded, and the protection circuit output voltage, the first feedback voltage and the second feedback voltage generate a base driving signal of the triode Q3 after passing through the feedback control circuit.
The invention has the advantages and positive effects that: the invention provides a multi-output power module special for storage battery management, wherein each output of a power supply is respectively used for supplying power to a management unit of each storage battery; the feedback control of the power supply is realized by adopting the triode and other discrete devices, a complex power supply control chip is not used, and the PWM generating circuit is built by adopting the triode and other discrete devices, so that the maintainability of the product is improved, and the cost is saved; the overcurrent protection circuit, the input undervoltage protection circuit and the output overvoltage protection circuit are provided, and the functions of the overcurrent protection circuit, the input undervoltage protection circuit and the output overvoltage protection circuit are integrated into a part of circuits to be realized, so that the design is simplified, and the product performance is stable and reliable; the adjustable function of the output voltage can be realized by adjusting the base current of the triode in the feedback control circuit; the main topological circuit adopts intermediate-stage direct current to alternating current and then alternating current to direct current to form a direct-alternating-direct topological structure, multi-path output is realized, output voltages are consistent and stable by adopting completely consistent magnetic rings at output ends, and normal work of each storage battery unit is ensured.
Drawings
FIG. 1 is a block diagram of an integrated battery intelligent monitoring system;
FIG. 2 is a circuit schematic of a main topology circuit of one embodiment of the present invention;
FIG. 3 is a schematic block circuit diagram of a pulse decision circuit according to an embodiment of the present invention;
FIG. 4 is a circuit schematic of a pulse generation circuit according to an embodiment of the present invention;
FIG. 5 is a circuit schematic of a protection circuit according to an embodiment of the present invention;
fig. 6 is a block diagram of a feedback control circuit according to an embodiment of the invention.
Detailed Description
Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
A multi-output power module for space storage battery management comprises a bus filter circuit, a main topology circuit, a feedback control circuit, a pulse judgment circuit, a pulse generation circuit and a protection circuit, wherein the bus filter circuit is connected with a bus to filter bus voltage, the voltage after bus filtering is V + in figure 2, and V + is used as input voltage of the main topology circuit; the main topological circuit comprises a voltage reduction circuit, a push-pull circuit and a rectification filter circuit which are sequentially connected, the input end of the feedback control circuit is respectively and electrically connected with the output end of the push-pull circuit and the output end of the protection circuit, and the output end of the feedback control circuit is electrically connected with the voltage reduction circuit. The input end of the pulse judging circuit is electrically connected with the output end of the push-pull circuit, and the output end of the pulse judging circuit is electrically connected with the input end of the pulse generating circuit. The output end of the pulse generating circuit is electrically connected with the input end of the push-pull circuit. The input end of the protection circuit is electrically connected with the main topology circuit, and the output end of the protection circuit is electrically connected with the feedback control circuit.
The main topology circuit is shown in fig. 2, and comprises three stages of transformation: the device comprises a voltage reduction circuit, a push-pull circuit and a post-stage rectifying and filtering circuit. The voltage reduction circuit takes the triode Q3 as a switching tube, and the switching tube Q3 is arranged at the negative end (grounding end), so that the starting voltage of the switching tube is reduced, and the starting safety of the switching tube is guaranteed; the push-pull circuit converts the direct-current voltage output by the voltage reduction circuit into alternating-current voltage, and then the alternating-current voltage is converted into the direct-current voltage by the third-stage rectifying and filtering circuit. The whole design is the transformation of 'direct-alternating-direct'. The T0-18 packaging triode is used as a switching device in the whole circuit topology, and high-power switching tubes such as MOSFET are not used, so that the weight of the product is reduced, and the cost of the product is reduced. The pipe cap of triode is pasted on the circuit board and is installed, and the copper is covered on the circuit board, so that the heat dissipation area is increased, the inverted installation mode is adopted, and the heat dissipation problem of the triode is effectively solved. In the three-level transformation, in order to realize output of at most 24 paths, output alternating-current voltage of the second level is respectively led into a plurality of three-level transformers, so that the size and the design difficulty of the transformer design are reduced. The three-stage transformers are all designed to be completely consistent, and the output voltage can be completely consistent.
The voltage reduction circuit comprises an NPN type triode Q3, a bus is connected with one end of a resistor RS through V + after being filtered by a bus filter circuit, the other end of the resistor RS is electrically connected with a push-pull circuit, an emitting electrode of the triode Q3 is grounded, a base electrode of the triode Q3 is electrically connected with a feedback control circuit, a collecting electrode of the triode Q3 is connected with one end of an inductor, the other end of the inductor is electrically connected with the push-pull circuit, two first diodes and two second diodes are sequentially connected between one end of the resistor RS and one end of the inductor, an anode of the first diode is connected with one end of the inductor, a cathode of the first diode is connected with an anode of the second diode, a cathode of the second diode is connected with one end of the resistor RS, and a capacitor C8 is connected between the.
The push-pull circuit comprises an NPN type triode Q1 and an NPN type triode Q2, wherein only one of the Q1 and the Q2 is conducted in work, the base electrodes of the triode Q1 and the triode Q2 are respectively and electrically connected with the pulse generating circuit, the other end of the inductor is respectively connected with the emitting electrodes of the triode Q1 and the triode Q2 and the positive electrodes of a third diode and a fourth diode, the push-pull circuit further comprises a secondary transformer, the primary coil of the secondary transformer is provided with middle connection points which are 3 and 4 in figure 2, the connection points at the two ends of the primary coil are 9 and 2 in figure 2, the other end of the resistor RS is connected with the middle connection points 3 and 4 of the primary coil, the cathodes of the third diode and the fourth diode are respectively connected with the two ends 9 and 2 of the primary coil, the secondary transformer is provided with a first secondary coil and a second secondary coil, the first secondary coil is provided with middle connection points 5 and 6, one end 1 of the first secondary coil is connected with a fifth diode in series to output voltage, the other end 10 of the first secondary coil is connected with a sixth diode in series to output voltage, the voltage output by the fifth diode and the sixth diode is a first feedback voltage B2, the anode of the fifth diode is connected with one end of the first secondary coil, the cathode output voltage of the fifth diode is a first feedback voltage B2, the cathodes of the fifth diode and the sixth diode are connected with a capacitor C7 in series and then grounded, the voltage output by the end 1 of the first secondary coil is a second feedback voltage A1 after being connected with a capacitor C6 and a resistor Rb in series, and the resistor Rb is connected with a capacitor C4 and then grounded; the second secondary coil is connected with a plurality of three-level transformers, and the output end of each three-level transformer, a plurality of tail end diodes and capacitors form a plurality of rectifying and filtering circuits to output the final required voltage.
The pulse decision circuit is realized by adopting a comparator and a hysteresis control circuit. As shown in fig. 3, the first feedback voltage B2 is divided by two different groups of voltage dividing resistors to form a first feedback divided voltage and a second feedback divided voltage. The first feedback voltage division and the second feedback voltage division are both electrically connected with the pulse judgment circuit, the pulse judgment circuit comprises a first comparator, a second comparator, a seventh diode, an eighth diode and a hysteresis control circuit, the first feedback voltage division and the reference voltage are compared by the first comparator and then are connected with the cathode of the seventh diode, the second feedback voltage division and the reference voltage are compared by the second comparator and then are connected with the cathode of the other eighth diode, the anodes of the seventh diode and the eighth diode and the voltage division of the reference voltage are respectively connected with the input end of the hysteresis control circuit, the output end of the hysteresis control circuit outputs a pulse control signal, and the pulse control signal is connected with the pulse generation circuit and controls the driving pulse of the push-pull circuit. The hysteresis control circuit is a conventional circuit, and belongs to the prior art, and therefore, is not described herein. The whole control circuit does not use a complex chip, so that the cost is reduced, and the maintainability of the system is improved.
As shown in fig. 4, the PWM pulse generating circuit is a resonant circuit formed by discrete devices such as a capacitor, an inductor, and a transistor, and the generated PWM pulse is input to the base of the switching tube of the two-stage conversion shown in fig. 2. The circuit does not use a complex control chip, saves the cost on the basis of ensuring the reliability of the circuit and improves the maintainability. Specifically, the pulse generating circuit includes an NPN transistor Q4 and an NPN transistor Q5, a base of the transistor Q4 is connected to one end of a resistor R5, one end of a resistor R4 and one end of a resistor R2, the other end of the resistor R4 is connected to one end of a capacitor C2, a collector of the transistor Q5 is connected to the other end of a capacitor C2, the other end of a resistor R2 and one end of an inductor L2, a base of the transistor Q5 is connected to one end of a resistor R5, one end of a resistor R5 and one end of a resistor R5, the other end of the resistor R5 is connected to one end of a capacitor C5, a collector of the transistor Q5 is connected to the other end of a capacitor C5, the other end of a resistor R5 and one end of an inductor L5, the other end of the inductor L5 and the other end of the inductor L5 are connected to the first feedback voltage B5, an emitter of the transistor Q5, the other end of the transistor Q, One end of a capacitor C3 is connected with the output end of the pulse judgment circuit, the other end of a capacitor C3 is grounded, the other end of a capacitor C2 is connected with the base electrode of the triode Q2, and the other end of a capacitor C1 is connected with the base electrode of the triode Q1.
The protection circuit has four functions of input overcurrent protection, input undervoltage protection, output overvoltage protection and output voltage fine adjustment. As shown in fig. 5, the designations in the figure mean as follows: v + is a positive voltage after the input voltage filtering; the point A is an input voltage undervoltage protection control point; the point B2 is used for outputting a first feedback voltage which becomes a point C voltage after voltage division; the voltage at the point C is output voltage of the protection circuit and serves as an input end of the feedback control circuit, the PWM output of the base electrode of the transistor Q3 in the first-stage conversion shown in the figure 2 is controlled, if the voltage at the point C is too large, the first-stage conversion is turned off, and the whole circuit has no output. The protection circuit comprises a PNP type triode Q6, a PNP type triode Q7, a PNP type triode Q8, a PNP type triode Q9, an NPN type triode Q10 and an NPN type triode Q11, wherein a bus is filtered by a bus filter circuit, then a V + series resistor R7 is connected with an emitter of a triode Q6, a V + series resistor R21 and a resistor R8 are connected with an emitter of a triode Q7, a V + series resistor is connected with an emitter of a triode Q8, a base, a collector and a base of a triode Q6 and a base of a triode Q7 are connected in series with a resistor R9 and then a collector of a triode Q11, a collector of a triode Q7 is connected in series with a resistor R10 and then a collector of a triode Q11, an emitter of the triode Q11 is connected in series with a resistor R11 and then grounded, a collector of the triode Q11 is connected with a base of a triode Q11, and a collector of the triode Q11 is connected with a low-voltage input point A after voltage division, an input voltage undervoltage protection control point series resistor R13 is connected with the emitter of a triode Q9, the base of a triode Q9 is connected with the input voltage undervoltage protection control point, the input voltage undervoltage protection control point series resistor R14 is grounded, the collector series resistor R15 of the triode Q9 is connected with the base of a triode Q10, the base series resistor R18 of the triode Q10 is grounded, the base series capacitor C5 of the triode Q10 is connected with the emitter of a triode Q10, a first feedback voltage B2 is connected with the collector of a triode Q10, the first feedback voltage series resistor R17 is divided to form a protection circuit output voltage C, the protection circuit output voltage is connected with the emitter of a triode Q10, the protection circuit output voltage series resistor R20 is grounded, the emitter series resistor R19 of the triode Q10 is grounded, and the protection circuit output voltage C is connected with the ground, the first feedback voltage B2 and the second feedback voltage A1 generate a base driving signal of a transistor Q3 in the voltage reduction circuit after passing through the feedback control circuit.
Inputting an overcurrent protection principle: a mirror current source composed of Q6 and Q7 is adopted to sample the input current flowing through a current sampling resistor RS, and a Q9 emitter current is generated, so that the base current of Q10 is controlled, if the base current is too large, the voltage of a point C is closer to the voltage of a point B2, the voltage of the point C is increased, a triode Q3 is disconnected, PWM pulse output is cut off, and the power module stops working.
Input undervoltage protection principle: the point a is a voltage division point of the input voltage V +, and if the voltage at the point a is too low, the current flowing through the Q9 increases, the current flowing through the base of the Q10 increases, the voltage at the point C is closer to the voltage at the point B2, the transistor Q3 is turned off, and the PWM pulse output is cut off.
Output overvoltage protection principle: the point B2 is output feedback voltage, the point C is divided voltage of the point B2, if the voltage of the point B2 is increased, the voltage of the point C is directly increased, the triode Q3 is disconnected, and PWM pulse output is cut off.
Output voltage trimming principle: the magnitude of the output voltage can be fine tuned by adjusting the base current ib of Q11.
As shown in fig. 6, B2 is a first feedback voltage, and is divided and compared with a second feedback voltage a1, which is a triangular wave, to generate a drive pulse of Q3. The output C of the protection circuit is a control end, and the comparison circuit is controlled to work or not, so that whether the Q3 is switched on or not is controlled.
The three protection functions are combined into a control voltage C, so that the complexity of the circuit is reduced. One protection circuit realizes four functions, and the effective utilization of the circuit is successfully realized.
In the embodiment, the input voltage V + is 42V, the output voltage of each path is 12V +/-2%, and the output current is 6 mA-8 mA. The pulse frequency of the voltage reduction circuit is 21.31kHz, the peak value is 1.47V, the voltage reduction circuit is a storage battery management unit with a plurality of space models, and the output of the power supply module is stable.
The invention provides a multi-output power module special for storage battery management, wherein each output of a power supply is respectively used for supplying power to a management unit of each storage battery; the feedback control of the power supply is realized by adopting the triode and other discrete devices, a complex power supply control chip is not used, and the PWM generating circuit is built by adopting the triode and other discrete devices, so that the maintainability of the product is improved, and the cost is saved; the overcurrent protection circuit, the input undervoltage protection circuit and the output overvoltage protection circuit are provided, and the functions of the overcurrent protection circuit, the input undervoltage protection circuit and the output overvoltage protection circuit are integrated into a part of circuits to be realized, so that the design is simplified, and the product performance is stable and reliable; the adjustable function of the output voltage can be realized by adjusting the base current of the triode in the protection circuit; the main topological circuit adopts intermediate-stage direct current to alternating current and then alternating current to direct current to form a direct-alternating-direct topological structure, multi-path output is realized, output voltages are consistent and stable by adopting completely consistent magnetic rings at output ends, and normal work of each storage battery unit is ensured.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (5)

1. The utility model provides a multiplexed output power module for space battery management which characterized in that: the bus voltage filtering circuit comprises a bus filtering circuit, a main topological circuit, a pulse judging circuit and a pulse generating circuit, wherein the bus filtering circuit is connected with a bus to filter bus voltage;
the input end of the protection circuit is electrically connected with the main topology circuit, the input end of the feedback control circuit is electrically connected with the output end of the push-pull circuit and the output end of the protection circuit respectively, and the output end of the feedback control circuit is electrically connected with the voltage reduction circuit;
the protection circuit comprises a triode Q6, a triode Q7, a triode Q8, a triode Q9, a triode Q10 and a triode Q11, wherein the bus is filtered by a bus filter circuit and then connected with an emitter of the triode Q6 through a series resistor R7, the bus is filtered by a bus filter circuit and then connected with an emitter of the triode Q7 through a series resistor R21 and a resistor R8, the bus is filtered by a bus filter circuit and then connected with an emitter of the triode Q8, a base, a collector and a base of the triode Q6 and a base of the triode Q7 are connected with a collector of the triode Q11 through a series resistor R9, a collector of the triode Q7 is connected with a collector of the triode Q11 after being connected with a series resistor R10, an emitter of the triode Q11 is connected with a series resistor R16 and then grounded, a collector of the triode Q7 is connected with a base of the triode Q7, a collector of the triode Q7 is connected with a collector of the resistor R7 after being connected with a series resistor R7, the bus is filtered by a bus filter circuit, the voltage divided by a series resistor R11 is an input voltage undervoltage protection control point, the input voltage undervoltage protection control point is connected with an emitter of the triode Q9 after being connected with a series resistor R13, the base of the triode Q9 is connected with the input voltage undervoltage protection control point, the input voltage undervoltage protection control point is connected with the resistor R14 and then grounded, a collector series resistor R15 of the triode Q9 is connected with the base of the triode Q10, the base of the triode Q10 is connected with the resistor R18 and then grounded, a base series capacitor C5 of the triode Q10 is connected with the emitter of the triode Q10, a first feedback voltage is connected with the collector of the triode Q10, the first feedback voltage series resistor R17 divides the voltage to form a protection circuit output voltage, and the protection circuit output voltage is connected with the emitter of the triode Q10, the protection circuit output voltage series resistor R20 is grounded, the emitter series resistor R19 of the triode Q10 is grounded, and the protection circuit output voltage, the first feedback voltage and the second feedback voltage generate a base driving signal of the triode Q3 after passing through the feedback control circuit.
2. The multi-output power module for space battery management according to claim 1, characterized in that: the voltage reduction circuit comprises a triode Q3, the bus is connected with one end of a resistor RS after being filtered by a bus filter circuit, the other end of the resistor RS is electrically connected with the push-pull circuit, the emitting electrode of the triode Q3 is grounded, the base electrode of the triode Q3 is electrically connected with the feedback control circuit, the collector electrode of the triode Q3 is connected with one end of an inductor, the other end of the inductor is electrically connected with the push-pull circuit, a first diode and a second diode are sequentially connected between one end of the resistor RS and one end of the inductor, the anode of the first diode is connected with one end of the inductor, the cathode of the first diode is connected with the anode of the second diode, the negative electrode of the second diode is connected with one end of the resistor RS, and a capacitor C8 is connected between the other end of the resistor RS and the other end of the inductor.
3. The multi-output power module for space battery management according to claim 2, characterized in that: the push-pull circuit comprises a triode Q1 and a triode Q2, the bases of the triode Q1 and the triode Q2 are respectively electrically connected with the pulse generating circuit, the other end of the inductor is respectively connected with the emitting electrodes of the triode Q1 and the triode Q2 and the anodes of a third diode and a fourth diode, the push-pull circuit further comprises a secondary transformer, the primary coil of the secondary transformer is provided with a middle connection point, the other end of the resistor RS is connected with the middle connection point of the primary coil, the cathodes of the third diode and the fourth diode are respectively connected with the two ends of the primary coil, the secondary transformer is provided with a first secondary coil and a second secondary coil, the first secondary coil is provided with a middle connection point, the middle connection point of the first secondary coil is grounded, and the two ends of the first secondary coil are respectively connected with the anodes of a fifth diode and a sixth diode, the voltages output by the cathodes of the fifth diode and the sixth diode are the first feedback voltage, the cathodes of the fifth diode and the sixth diode are connected in series with a capacitor C7 and then grounded, the voltage output by the upper end of the first secondary coil after being connected in series with a capacitor C6 and a resistor Rb is the second feedback voltage, and the resistor Rb is connected in series with a capacitor C4 and then grounded; the second secondary coil is connected with a plurality of three-level transformers, and the output ends of the three-level transformers, a plurality of tail end diodes and capacitors form a plurality of rectifying and filtering circuits to output final required voltage.
4. The multi-output power module for space battery management according to claim 3, characterized in that: the first feedback voltage is connected with two groups of different voltage division resistors to form first feedback voltage division and second feedback voltage division after voltage division, the first feedback voltage division and the second feedback voltage division are both electrically connected with the pulse judgment circuit, the pulse decision circuit comprises a first comparator, a second comparator, a seventh diode, an eighth diode and a hysteresis control circuit, the first feedback divided voltage and the reference voltage are compared by the first comparator and then are connected with the cathode of the seventh diode, the second feedback divided voltage and the reference voltage are connected with the cathode of the eighth diode after being compared by the second comparator, the anodes of the seventh diode and the eighth diode and the divided voltage of the reference voltage are respectively connected with the input end of the hysteresis control circuit, the output end of the hysteresis control circuit outputs a pulse control signal, and the pulse control signal is connected with the pulse generating circuit.
5. The multi-output power module for space battery management according to claim 4, characterized in that: the pulse generating circuit comprises a triode Q4 and a triode Q5, wherein the base of the triode Q4 is respectively connected with one end of a resistor R5, one end of a resistor R4 and one end of a resistor R2, the other end of the resistor R4 is connected with one end of a capacitor C2, the collector of the triode Q5 is respectively connected with the other end of a capacitor C2, the other end of the resistor R2 and one end of an inductor L2, the base of the triode Q5 is respectively connected with one end of a resistor R6, one end of a resistor R3 and one end of a resistor R1, the other end of the resistor R3 is connected with one end of a capacitor C1, the collector of the triode Q4 is respectively connected with the other end of a capacitor C1, the other end of a resistor R1 and one end of an inductor L1, the other end of the inductor L1 and the other end of the inductor L2 are respectively connected with the first feedback voltage, the emitter of the triode Q4, the emitter of the transistor Q5 and, The other end of the resistor R5, the other end of the resistor R6 and one end of the capacitor C3 are respectively connected with the output end of the pulse judging circuit, the other end of the capacitor C3 is grounded, the other end of the capacitor C2 is connected with the base of the triode Q2, and the other end of the capacitor C1 is connected with the base of the triode Q1.
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