CN111416331B - Pre-charging circuit for suppressing surge current of direct-current power supply - Google Patents

Pre-charging circuit for suppressing surge current of direct-current power supply Download PDF

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Publication number
CN111416331B
CN111416331B CN202010225304.3A CN202010225304A CN111416331B CN 111416331 B CN111416331 B CN 111416331B CN 202010225304 A CN202010225304 A CN 202010225304A CN 111416331 B CN111416331 B CN 111416331B
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relay
charging
power supply
circuit
diodes
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CN111416331A (en
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张亚鹏
杨永淼
马季军
屈诚志
蒋坤
刘瑜
陈思佳
王俊
周世亮
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Shanghai Institute of Space Power Sources
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Shanghai Institute of Space Power Sources
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/547—Combinations of mechanical switches and static switches, the latter being controlled by the former
    • 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
    • H02J1/00—Circuit arrangements for dc mains or dc distribution networks
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The invention provides a high-reliability pre-charging circuit for restraining DC power supply surge current of a power supply and distribution system of a spacecraft, namely the pre-charging circuit for restraining the DC power supply surge current, which belongs to the technical field of designing the DC power supply and distribution system of the spacecraft and comprises a pre-charging relay and an instruction interface circuit thereof, a relay state remote measuring interface circuit and a pre-charging slow starting circuit; according to the invention, the MOS switch tube is controlled to be slowly conducted through the low-voltage 28V instruction bus to realize that the high-voltage 100V bus pre-charges capacitive equipment, the power supply switch is switched on after the bus voltage is established and the capacitor is charged, and the pre-charging power supply switch is switched off, so that the power-on instantaneous surge current can be effectively inhibited, and the relay contact and the fuse of the power supply switch are protected; and through the redundancy design of the capacitor, the resistor, the diode, the MOS tube and the relay, the pre-charging circuit has no single-point fault mode, and the reliability of the direct-current power supply surge current suppression circuit is greatly improved.

Description

Pre-charging circuit for suppressing surge current of direct-current power supply
Technical Field
The invention relates to a pre-charging circuit for suppressing surge current of a direct-current power supply, in particular to a pre-charging circuit for suppressing the surge current of the direct-current power supply of a high-reliability spacecraft power supply and distribution system, which is particularly used for suppressing the instantaneous surge current of capacitive electric equipment in the spacecraft direct-current power supply and distribution system and belongs to the technical field of design of the spacecraft direct-current power supply and distribution system.
Background
In order to realize electromagnetic compatibility, ensure bus voltage quality and impedance matching, a spacecraft power supply and distribution system usually arranges a filter composed of an inductor, a capacitor and a resistor at the front end of a load input, and connects a large capacitor array in parallel. According to the capacitance characteristics, a large surge current is formed at the moment of power-on, and common faults which may be caused are as follows: the fuse of the fuse or the overcurrent protection circuit acts repeatedly, and the system cannot be powered on; and the contact of the relay of the power supply switch is adhered, so that the on-off control is invalid.
According to the use requirements of the relay or the fuse, the working current of the relay or the fuse does not exceed the rated current, so that a device with the rated current meeting the use requirements is selected, or the surge current at the power-on moment of the system is reduced. However, when a device with a large rated current is used, the weight of the device and the size of the body are large, which increases the weight of the aircraft, and the device has a large installation size, so that a feasible and effective measure for reducing the surge current is required.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the pre-charging circuit for suppressing the DC power supply surge current comprises a pre-charging relay, a command interface circuit of the pre-charging relay, a relay state remote measurement interface circuit and a pre-charging slow start circuit; according to the invention, the MOS switch tube is controlled to be slowly conducted through the low-voltage 28V instruction bus to realize that the high-voltage 100V bus pre-charges capacitive equipment, the power supply switch is switched on after the bus voltage is established and the capacitor is charged, and the pre-charging power supply switch is switched off, so that the power-on instantaneous surge current can be effectively inhibited, and the relay contact and the fuse of the power supply switch are protected; and through the redundancy design of the capacitor, the resistor, the diode, the MOS tube and the relay, the pre-charging circuit has no single-point fault mode, and the reliability of the direct-current power supply surge current suppression circuit is greatly improved.
The purpose of the invention is realized by the following technical scheme:
a pre-charging circuit for suppressing surge current of a direct-current power supply comprises a pre-charging relay, a pre-charging relay command interface circuit, a relay state remote measuring interface circuit and a pre-charging slow starting circuit;
the external command bus controls the pre-charging relay through a pre-charging relay command interface circuit; the pre-charging relay is used for controlling the pre-charging slow-starting circuit; the external power supply bus pre-charges capacitive load equipment through a pre-charging slow-starting circuit; the relay state remote sensing interface circuit is used for detecting the state of a pre-charging relay;
the pre-charging slow-start circuit comprises an RC network and an MOS switching tube, wherein the RC network is used for controlling the grid-source voltage of the MOS switching tube; when an external power supply bus pre-charges capacitive load equipment through a pre-charging slow-start circuit, firstly charging an RC network, and as the voltage of a capacitor in the RC network rises, an MOS switching tube enters a linear region from a cut-off region; the capacitive load device is then precharged.
In the above precharge circuit for dc power supply inrush current suppression, preferably, the precharge relay includes a relay K1 and a relay K2; when the external command bus supplies power to the coils of relay K1 and relay K2, relay K1 and relay K2 switch operation between on and off.
In the precharge circuit for suppressing the inrush current of the dc power supply, preferably, the front excitation coil and the rear excitation coil of the relay K1 and the relay K2 are connected in parallel, the two contacts of the relay K1 are connected in series, the two contacts of the relay K2 are connected in series, and the two series contacts of the relay K1 and the two series contacts of the relay K2 are used in parallel.
In the above pre-charge circuit for dc power supply inrush current suppression, preferably, the pre-charge relay command interface circuit further includes two sets of first back-emf eliminating diodes; one group of first counter electromotive force eliminating diodes are connected to the positive end and the negative end of the front exciting coil of the relay K1 and the relay K2; and the other group of first counter electromotive force eliminating diodes are connected to the positive end and the negative end of the rear exciting coil of the relay K1 and the relay K2.
In the above pre-charge circuit for suppressing inrush current of a dc power supply, preferably, the pre-charge relay command interface circuit further includes two sets of isolation diodes; the anodes of the isolating diodes are connected with an external command bus, and the cathodes of the isolating diodes are connected with the positive ends of the front exciting coils of the relay K1 and the relay K2; the anode of another set of isolation diodes is connected to the external command bus and the cathode is connected to the positive terminals of the rear excitation coils of relay K1 and relay K2.
In the above pre-charge circuit for suppressing a dc power supply surge current, preferably, the pre-charge slow-start circuit includes 4 MOS switch tubes and 4 vibration elimination resistors, and a gate of each MOS switch tube is connected in series with a vibration elimination resistor; the 4 MOS switch tubes are divided into two groups and are connected in a mode of first parallel connection and then series connection.
In the above pre-charge circuit for dc power surge current suppression, preferably, the RC network includes 4 tantalum capacitors and 4 resistors; the 4 tantalum capacitors are divided into two groups and connected in series and then in parallel; two resistors are connected in parallel at two ends of each group of tantalum capacitors, and the other two resistors are connected in parallel and then connected between the negative ends of the two groups of tantalum capacitors and the output end of the pre-charging relay.
In the above pre-charging circuit for suppressing inrush current of a dc power supply, preferably, the relay state remote measurement interface circuit includes a resistance voltage division type measurement circuit and a relay K3;
the resistance voltage-dividing type measuring circuit is used for measuring the voltage representing the state of the pre-charging relay; the relay K3 is connected with the pre-charging relay in parallel and acts synchronously, and the telemetering parameters output by the relay K3 represent the state of the pre-charging relay.
In the above pre-charging circuit for suppressing a dc power supply inrush current, preferably, the relay state telemetry interface circuit further includes two sets of second back electromotive force elimination diodes; one group of second counter electromotive force eliminating diodes are connected to the positive end and the negative end of the front exciting coil of the relay K3; and the other group of second counter electromotive force eliminating diodes are connected to the positive end and the negative end of the rear exciting coil of the relay K3.
A pre-charging method for restraining surge current of a direct current power supply, which adopts the pre-charging circuit for restraining the surge current of the direct current power supply, comprises the following steps:
s1, firstly, sending a pre-charging relay switch-on command through a command bus, pre-charging capacitive load equipment, and telemetering the state of the pre-charging relay;
s2, switching on a power supply switch after the capacitive load equipment bus voltage is established and the load capacitor is charged;
and S3, sending a precharge relay disconnection command, and telemetering the state of the precharge relay.
Compared with the prior art, the invention has the following beneficial effects:
(1) because the spacecraft power supply and distribution system has capacitive electric equipment, the pre-charging circuit can effectively reduce the surge current at the moment of power-on of the power supply and distribution system and protect a power supply switch relay and a fuse;
(2) the grid control characteristics of the field effect tube are reasonably utilized, the pre-charging relay is controlled to be switched on or switched off through a switching-on or switching-off command, and then the P-channel field effect tube is controlled to be switched on or switched off slowly, so that the switching-on and switching-off of the power supply of the high-voltage 100V bus are controlled by the low-voltage 28V command bus, the power supply safety is improved, and meanwhile, the miniature and light relay is used, and the circuit weight and the installation size are effectively reduced;
(3) since the safety of the spacecraft power supply and distribution system is of great importance, the reliability requirements are extremely high. In the pre-charging circuit, the capacitor, the resistor, the diode, the MOS tube and the relay are designed in a redundancy way, so that the safety and the reliability of the circuit are enhanced, and a single-point fault mode does not exist in the circuit;
(4) because the space high-energy particle influence exists when the electronic product for the space aircraft works, in order to avoid MOS tube burnout abnormity caused by single particle impact in space application, the pre-charging circuit of the invention selects the MOS tube with the diameter of more than or equal to 75MeV.cm2The P-channel MOS tube with the/mg index is used as a core device.
Drawings
FIG. 1 is a schematic diagram of a precharge circuit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A pre-charging circuit for suppressing surge current of a direct-current power supply comprises a pre-charging relay, a pre-charging relay command interface circuit, a relay state remote measuring interface circuit and a pre-charging slow starting circuit;
the external command bus controls the pre-charging relay through a pre-charging relay command interface circuit; the pre-charging relay is used for controlling the pre-charging slow-starting circuit; the external power supply bus pre-charges capacitive load equipment through a pre-charging slow-starting circuit; the relay state telemetry interface circuit is used for detecting the state of the pre-charge relay.
The pre-charging slow-start circuit comprises an RC network and an MOS switching tube, wherein the RC network is used for controlling the grid-source voltage of the MOS switching tube; when an external power supply bus pre-charges capacitive load equipment through a pre-charging slow-start circuit, firstly charging an RC network, and as the voltage of a capacitor in the RC network rises, an MOS switching tube enters a linear region from a cut-off region; the capacitive load device is then precharged.
The pre-charging relay comprises a relay K1 and a relay K2; when the external command bus supplies power to the coils of relay K1 and relay K2, relay K1 and relay K2 switch operation between on and off. The front exciting coil and the rear exciting coil of the relay K1 and the relay K2 are respectively connected in parallel, two contacts of the relay K1 are connected in series, two contacts of the relay K2 are connected in series, and two series contacts of the relay K1 and two series contacts of the relay K2 are used in parallel.
The relay state remote measuring interface circuit comprises a resistance voltage division type measuring circuit and a relay K3; the resistance voltage-dividing type measuring circuit is used for measuring the voltage representing the state of the pre-charging relay; the relay K3 is connected with the pre-charging relay in parallel and acts synchronously, and the telemetering parameters output by the relay K3 represent the state of the pre-charging relay.
The pre-charging method for suppressing the surge current of the direct-current power supply adopts the pre-charging circuit and comprises the following steps:
s1, firstly, sending a pre-charging relay switch-on command through a command bus, pre-charging capacitive load equipment, and telemetering the state of the pre-charging relay;
s2, switching on a power supply switch after the capacitive load equipment bus voltage is established and the load capacitor is charged;
and S3, sending a precharge relay opening command and telemetering the state of the precharge relay.
Example (b):
the problems of ablation and adhesion of relay contacts and fuse fusing of a fuse in the process of using a magnetic latching relay and the fuse for a power supply switch and a capacitor array in a power supply and distribution system of a spacecraft are solved; therefore, the direct current power supply surge current suppression circuit is suitable for a power supply and distribution system on a spacecraft. The circuit uses light and miniaturized components, adopts low-voltage control high voltage, carries out redundancy design, provides safe and reliable pre-charging function, effectively reduces surge current and protects key components of a power supply and distribution system, namely a magnetic latching relay and a fuse.
A high-reliability pre-charging circuit for suppressing surge current of a direct-current power supply of a power supply and distribution system of a spacecraft comprises a pre-charging relay, a command interface circuit of the pre-charging relay, a relay state remote measurement interface circuit and a pre-charging slow start circuit;
when a precharge relay on or off command is sent, the coils of the relays K1, K2 and K3 are powered through a 28V command bus, and switching operation of switching the relays on or off is carried out;
when the pre-charging relays K1 and K2 are disconnected, the power MOS tubes T1, T2, T3 and T4 are in a cut-off region, and no pre-charging current flows;
when the pre-charging relays K1 and K2 are switched on, a 100V bus charges an RC network formed by resistors R5, R6, R7 and R8 and capacitors C1, C2, C3 and C4, so that the gate-source voltages of power MOS transistors T1, T2, T3 and T4 are slowly increased, the MOS transistors enter a linear region from an off region, the source-drain currents of the MOS transistors are small, the source leakage currents of the MOS transistors are slowly increased along with the increase of the voltages of the capacitors C1, C2, C3 and C4, and the load device capacitors are charged;
when the pre-charging relays K1 and K2 are switched on or off, the state measuring relay K3 synchronously operates, voltage division is carried out through resistors R9, R10 and R11, and the telemetering parameters output by the relay K3 represent the states of the pre-charging relays K1 and K2.
The pre-charge relay and its command interface circuit include an isolation diode, a relay, and a back-emf cancellation diode.
The isolation diodes comprise diodes D1, D2, D3 and D4, the diodes D1 and D2 are connected in parallel, the anodes of the diodes are connected with a 28V command bus, and the cathodes of the diodes are connected with the positive ends of front exciting coils of relays K1 and K2; the diodes D3 and D4 are connected in parallel, the anode is connected with a 28V command bus, and the cathode is connected with the positive ends of the excitation coils behind the relays K1 and K2;
the pre-charging relay comprises relays K1 and K2, front exciting coils and rear exciting coils of the relays K1 and K2 are respectively connected in parallel, two contacts of the relay K1 are connected in series, two contacts of the relay K2 are connected in series, two series of contacts of the relay K1 and two series of contacts of the relay K2 are used in parallel, one end of each contact is connected with the ground of a 100V bus, and the other end of each contact is connected with resistors R7 and R8;
the counter electromotive force eliminating diode comprises diodes D5, D6, D7 and D8, diodes D5 and D6 are connected in series, the cathode of the diode D5 is connected with the positive ends of front exciting coils of relays K1 and K2, and the anode of the diode D6 is connected with the negative ends of front exciting coils of relays K1 and K2; diodes D7 and D8 are connected in series, the cathode of diode D7 is connected with the positive end of the exciting coil behind relays K1 and K2, and the anode of diode D8 is connected with the negative end of the exciting coil behind relays K1 and K2.
The relay state remote measuring interface circuit comprises a resistance voltage division type measuring circuit, a relay and a counter electromotive force eliminating diode;
the resistance voltage-dividing type measuring circuit comprises resistors R9, R10, R11, capacitors C5 and C6, one end of a resistor R9 is connected with the resistors R10 and R11 which are connected in parallel in series, the other end of the resistor R9 is connected with a +12V power supply, the capacitors C5 and C6 are connected in series and then connected with two ends of the resistor R10 in parallel, and the other end of the resistor R10 is connected with a +12V ground;
the relay comprises a relay K3, the positive ends of a front exciting coil and a rear exciting coil of the relay K3 are connected in parallel and then connected with a 28V command bus, and the negative ends of the front exciting coil and the rear exciting coil are respectively connected with a pre-charging relay switch-on command and a pre-charging relay switch-off command; two groups of contacts of the relay K3 are used in parallel, and telemetry parameters are output to represent the states of the pre-charging relays K1 and K2;
the counter electromotive force eliminating diode comprises diodes D9, D10, D11 and D12, the diodes D9 and D10 are connected in series, the cathode of the diode D9 is connected with the positive end of the front exciting coil of the relay K3, and the anode of the diode D10 is connected with the negative end of the front exciting coil of the relay K3; diodes D11 and D12 are connected in series, the cathode of diode D11 is connected with the positive end of the excitation coil behind the relay K3, and the anode of diode D12 is connected with the negative end of the excitation coil behind the relay K3.
The pre-charging slow-start circuit comprises a capacitance resistor for controlling pre-charging time, an MOS switching tube and a grid vibration elimination resistor thereof;
the capacitor resistor for controlling the pre-charging time comprises tantalum capacitors C1, C2, C3 and C4 and resistors R5, R6, R7 and R8, the tantalum capacitors C1 and C2 which are connected in series are connected in parallel with the tantalum capacitors C3 and C4 which are connected in series, the positive ends of C1 and C3 are connected with a 100V bus, and the negative ends of C2 and C4 are connected with the resistors R7 and R8;
the tantalum capacitors C1, C2, C3 and C4 may be C1 ═ C2 ═ C3 ═ C4, the resistors R5, R6, R7 and R8 may be R5 ═ R6 and R7 ═ R8, and the requirement of-2 (R5/(R5+ R7)) U6356) is satisfiedi＞VGS(th)Wherein U isi Is 100V bus voltage, VGS(th)Starting a voltage threshold for a P-channel MOS tube;
the MOS switching tube and the grid vibration elimination resistor thereof comprise P-channel field effect tubes T1, T2, T3, T4 and vibration elimination resistors R1, R2, R3 and R4, the MOS switching tube T1, the MOS switching tube T2, the MOS switching tube T3 and the MOS switching tube T4 are connected in series, and the grid electrodes of the MOS switching tube are respectively connected with one vibration elimination resistor in series; by using the two parallel-series connection of the MOS tubes, the problem of pre-charging function loss caused by the open circuit or short circuit of the MOS tubes is effectively solved.
The method for pre-charging the capacitive load equipment by using the pre-charging circuit for restraining the surge current of the direct-current power supply of the power supply and distribution system of the spacecraft is characterized by comprising the following steps of:
1) when the capacitive load equipment of the power supply and distribution system of the spacecraft is powered on, sending a pre-charging relay connection instruction, pre-charging the capacitive load equipment, and telemetering the state of the pre-charging relay;
2) after the capacitive load equipment bus voltage is established and the capacitor is charged, switching on a power supply switch;
3) and sending a precharge relay disconnection command, and telemetering the state of the precharge relay.
The present embodiment is further described below with reference to the accompanying drawings.
As shown in figure 1, the high-reliability pre-charging circuit for restraining the DC power supply inrush current of the power supply and distribution system of the spacecraft comprises a pre-charging relay and a command interface circuit thereof, a relay state remote measurement interface circuit and a pre-charging slow-up circuit.
When a precharge relay on or off command is sent, the coils of the relays K1 and K2 are supplied with power through the 28V command bus, and switching operation of closing or opening the relays is executed. The relays K1 and K2 are miniature magnetic latching relays 2JB0.5-1, and have the advantages of small size, low power consumption, high reliability and the like. In the example, the relays K1 and K2 are used in parallel, and 28V instruction buses for switching on and off the coil are isolated by two parallel diodes, so that the existence of a sneak path is effectively avoided.
The relay state telemetering interface circuit, relay K3 output through resistance R9 and R10, R11 partial pressure state quantity, characterize precharge relay K1 and K2 closed or open state. The relay K3 is a micro magnetic latching relay 2JB 0.5-1.
When the pre-charging relays K1 and K2 are switched on, a 100V bus charges an RC network formed by resistors R5, R6, R7 and R8 and capacitors C1, C2, C3 and C4, so that the gate-source voltages of power MOS transistors T1, T2, T3 and T4 are gradually increased, the MOS transistors enter a linear region from an off region, the source-drain currents of the MOS transistors are small, the source-drain currents of the MOS transistors are gradually increased along with the increase of the voltages of the capacitors C1, C2, C3 and C4, and the load device capacitors are charged. In the embodiment, the resistor, the capacitor and the MOS tube are designed in a redundancy way, and the pre-charging function of inhibiting surge current cannot be influenced by the failure of any device, so that the reliability of a power supply and distribution system is improved.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.

Claims (6)

1. A pre-charging circuit for suppressing surge current of a direct-current power supply is characterized by comprising a pre-charging relay, a pre-charging relay command interface circuit, a relay state remote measurement interface circuit and a pre-charging slow start circuit;
the external command bus controls the pre-charging relay through a pre-charging relay command interface circuit; the pre-charging relay is used for controlling the pre-charging slow-starting circuit; the external power supply bus pre-charges capacitive load equipment through a pre-charging slow-starting circuit; the relay state remote sensing interface circuit is used for detecting the state of a pre-charging relay;
the pre-charging slow-start circuit comprises an RC network and an MOS switching tube, wherein the RC network is used for controlling the grid-source voltage of the MOS switching tube; when an external power supply bus pre-charges capacitive load equipment through a pre-charging slow-start circuit, firstly charging an RC network, and as the voltage of a capacitor in the RC network rises, an MOS switching tube enters a linear region from a cut-off region; then the capacitive load equipment is precharged;
the pre-charging slow start circuit comprises 4 MOS switching tubes and 4 vibration elimination resistors, and the grid electrode of each MOS switching tube is respectively connected with one vibration elimination resistor in series; the 4 MOS switching tubes are divided into two groups and are connected in a mode of first parallel connection and then series connection;
the RC network comprises 4 tantalum capacitors and 4 resistors; the 4 tantalum capacitors are divided into two groups and connected in series and then in parallel; two resistors are connected in parallel at two ends of each group of tantalum capacitors, and the other two resistors are connected in parallel and then connected between the negative ends of the two groups of tantalum capacitors and the output end of the pre-charging relay;
the relay state remote measuring interface circuit comprises a resistance voltage division type measuring circuit and a relay K3;
the resistance voltage-dividing type measuring circuit is used for measuring the voltage representing the state of the pre-charging relay; the relay K3 is connected with the pre-charging relay in parallel and acts synchronously, and the telemetering parameters output by the relay K3 represent the state of the pre-charging relay;
the relay state telemetering interface circuit also comprises two groups of second back electromotive force eliminating diodes; one group of second counter electromotive force eliminating diodes are connected to the positive end and the negative end of a front exciting coil of the relay K3; and the other group of second counter electromotive force eliminating diodes are connected to the positive end and the negative end of the rear exciting coil of the relay K3.
2. A pre-charge circuit for dc power supply inrush current suppression as claimed in claim 1, wherein the pre-charge relay comprises relay K1 and relay K2; when the external command bus supplies power to the coils of relay K1 and relay K2, relay K1 and relay K2 switch operation between on and off.
3. A pre-charging circuit for DC power supply surge current suppression according to claim 2, characterized in that the front and rear excitation coils of relay K1 and relay K2 are respectively connected in parallel, two contacts of relay K1 are connected in series, two contacts of relay K2 are connected in series, two series contacts of relay K1 and two series contacts of relay K2 are used in parallel.
4. A pre-charge circuit for dc power supply inrush current suppression as claimed in claim 2, wherein the pre-charge relay command interface circuit further comprises two sets of first back emf diodes; one group of first counter electromotive force eliminating diodes are connected to the positive end and the negative end of the front exciting coil of the relay K1 and the relay K2; and the other group of first counter electromotive force eliminating diodes are connected to the positive end and the negative end of the rear exciting coil of the relay K1 and the relay K2.
5. A pre-charge circuit for dc power supply inrush current suppression as claimed in claim 2, wherein the pre-charge relay command interface circuit further comprises two sets of isolation diodes; the anodes of the isolating diodes are connected with an external command bus, and the cathodes of the isolating diodes are connected with the positive ends of the front exciting coils of the relay K1 and the relay K2; the anode of another set of isolation diodes is connected to the external command bus and the cathode is connected to the positive terminals of the rear excitation coils of relay K1 and relay K2.
6. A pre-charging method for restraining surge current of a direct current power supply, which is characterized in that the pre-charging circuit of any one of claims 1-5 is adopted, and the method comprises the following steps:
s1, firstly, sending a pre-charge relay switch-on command through a command bus, pre-charging capacitive load equipment, and telemetering the state of the pre-charge relay;
s2, switching on a power supply switch after the capacitive load equipment bus voltage is established and the load capacitor is charged;
and S3, sending a precharge relay opening command and telemetering the state of the precharge relay.
CN202010225304.3A 2020-03-26 2020-03-26 Pre-charging circuit for suppressing surge current of direct-current power supply Active CN111416331B (en)

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