CN109274256B - Power module redundant energy supply circuit based on breakdown diode and control method - Google Patents

Power module redundant energy supply circuit based on breakdown diode and control method Download PDF

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Publication number
CN109274256B
CN109274256B CN201811153694.7A CN201811153694A CN109274256B CN 109274256 B CN109274256 B CN 109274256B CN 201811153694 A CN201811153694 A CN 201811153694A CN 109274256 B CN109274256 B CN 109274256B
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board card
bypass switch
resistor
power module
power
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CN109274256A (en
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汪涛
虞晓阳
李汉杰
常远
文继锋
曹东明
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NR Electric Co Ltd
NR Engineering Co Ltd
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NR Electric Co Ltd
NR Engineering Co Ltd
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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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • 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
    • H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters

Abstract

The invention discloses a power module redundant energy supply circuit based on a breakdown diode and a control method. The power module comprisesAt least one power semiconductor unit, a sub-module capacitor CMBypass switch KBThe power supply board card and the control board card. The redundant energy supply circuit is composed of a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator tube VD1 and a first breakdown diode DBOAnd a connection module. According to the scheme of the invention, after the power board card fails, the voltage-sharing resistor is used for dividing voltage to charge the energy-storage capacitor of the bypass switch, and the breakdown diode is used for supplying power to the control board card after breakdown, so that reliable switching-on of the bypass switch and delivery of the bypass switch in a sub-module state are ensured after the power board card fails, system shutdown and fault operation under an unknown bypass switch state are avoided, and the safety and reliability of the system are improved. The scheme of the invention utilizes the energy of the voltage-sharing resistance loop to improve the economical efficiency of system operation, adopts a fully passive structure, is simple and reliable, and has the advantages of feasibility and low cost.

Description

Power module redundant energy supply circuit based on breakdown diode and control method
Technical Field
The invention discloses a power module redundant energy supply circuit based on a Breakdown Over Diode (BOD) and a control method, and relates to the field of flexible alternating current and direct current power transmission, in particular to an energy taking technology of a power unit module.
Background
The cascade multilevel converter is widely applied to occasions of electric power, rail transit and new energy such as extra-high voltage alternating current and direct current transmission, reactive compensation, direct current distribution networks and the like. In order to ensure the safe and stable operation of the cascaded multi-level converter, the power module requires a fault bypass function, and when a fault occurs inside the submodule, the fault module is bypassed by the bypass function, so that the fault is prevented from being enlarged, the system is maintained to continue to operate, and the economic loss is avoided.
However, the power board is used as an energy source for implementing all control protection functions in the power module, and a certain fault probability exists due to the service life limitation, aging, failure and other external reasons of the device. Especially, before the system is started, the power board card has a fault working condition, the bypass switch does not have energy required by switching on, the sub-module control board cannot normally send an instruction, and then the bypass function cannot be realized, so that the whole system can be stopped. The invention patent CN201710228027.X provides a multi-level converter submodule bypass switch self-triggering circuit, energy on the alternating current side of a power module unit is used for charging a bypass switch energy storage capacitor, however, if a power panel fails before a system is started, the bypass switch energy storage capacitor is short-circuited due to the fact that the resistance of a bypass switch closing coil is small, and charging cannot be completed, so that the bypass switch cannot complete closing. The invention patent CN108111007A discloses a power module redundant energy supply circuit and a control method, after a power board card fails, a first voltage regulator tube is broken down after the voltage of a first capacitor exceeds a certain threshold to charge an energy storage capacitor of a bypass switch, a second voltage regulator tube is broken down after the voltage of the first capacitor exceeds another threshold to trigger a second switch to be switched on, and then the bypass switch is triggered to be switched on. However, the invention introduces a plurality of high-voltage-stabilizing tubes, which can cause serious heating and poor reliability; the capacity of the bypass switch energy storage capacitor is over several hundred microfarad orders of magnitude, and the bypass switch energy storage capacitor can be charged only after the first capacitor voltage breaks through the first voltage regulator tube, so that the charging time before breakdown is wasted; the introduction of the voltage-stabilizing tube limits the current of the charging loop and influences the charging speed; the voltage stabilizing discreteness of the voltage stabilizing tube is large, the temperature drift is large, and the protection precision is greatly influenced; in addition, a plurality of high-voltage switches are introduced, isolation control is needed, the control is complex, and the engineering feasibility of implementation is poor; more importantly, the invention only makes efforts for realizing the reliable bypass of the bypass switch, but if the bypass switch body fails or is worse, the superior control system cannot know the state of the fault module, and if the bypass switch body continues to operate under the condition of bypass failure, the fault is further expanded, and more serious loss is caused.
Based on the analysis, the application provides a power module redundant energy supply circuit based on a breakdown diode and a control method, so that redundant energy supply of a bypass switch and a power module control board is realized, and the scheme is generated.
Disclosure of Invention
Object of the Invention
The technical problem to be solved by the invention is as follows: the power module can not execute a bypass after a power board card fails to operate, so that a system stops operating, and can operate with a fault under the condition that the bypass state is unknown, and the power module redundant energy supply circuit based on the breakdown diode and the control method are provided. When the power supply board card of the power module fails, the redundant energy supply circuit supplies energy required by switching on to the bypass switch, supplies power to the power module control board card, ensures reliable switching on of the bypass switch, avoids system shutdown, and sends the state of the fault module to the power module control board card, avoids system operation with faults, and improves the safety and reliability of system operation.
Technical scheme
A power module redundant energy supply circuit based on a breakdown diode is disclosed, wherein the power module at least comprises a power semiconductor unit and a power module capacitor CMBypass switch KBThe power supply board card and the control board card; the bypass switch KBComprises a control coil and a bypass switch energy storage capacitor CBThe power supply board card supplies the control board card and the bypass switch energy storage capacitor CBThe power supply is realized, the output positive end of the power supply board card is connected with a bypass switch energy storage capacitor CBThe positive pole and the negative output terminal of the capacitor are connected with a bypass switch energy storage capacitor CBA negative electrode; the power module redundant energy supply circuit based on the breakdown diode is composed of a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator tube VD1 and a first breakdown diode DBOAnd a connection module; the connecting module is a diode, a lead, a mechanical switch, a relay, an electronic switch or a semiconductor controllable device; one end of the first resistor R1 and the power module capacitor CMThe anode is connected, the other end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with the power module capacitor CMThe negative electrodes are connected; one end of the connection module is connected to the connection between the first resistor R1 and the second resistor R2A contact point, the other end of the connecting module is connected to the bypass switch energy storage capacitor CBEnergy storage capacitor C of anode and bypass switchBThe negative electrode is connected to the power module capacitor CMA negative electrode; one end of the third resistor R3 is connected to the power module capacitor CMThe other end of the anode of the third resistor R3 is connected to the first breakdown diode DBOAnode, first breakdown diode DBOThe cathode is connected to the cathode of a first voltage regulator tube VD1, the anode of the first voltage regulator tube VD1 is connected to a power module capacitor CMA negative electrode; the cathode of the first voltage-stabilizing tube VD1 is connected to the positive input end of the control board card, and the anode of the first voltage-stabilizing tube VD1 is connected to the negative input end of the control board card.
Furthermore, the control board card comprises a communication unit, a bypass trigger unit and a detection protection unit,
the bypass switch KBOne end of the control coil is connected to the bypass switch energy storage capacitor CBPositive pole, bypass switch KBThe other end of the control coil is connected to a controllable switch QBPositive pole of (2), controllable switch QBIs connected to the bypass switch energy storage capacitor CBAnd a negative electrode. The communication unit is responsible for receiving the instruction of the superior control system and sending the state information of the power module; the bypass trigger unit is responsible for executing a bypass trigger command and controlling the controllable switch QBTurn on and turn off; the detection protection unit is responsible for detecting the state of the power module, monitoring point voltage and current sampling and the active protection function of the power module body.
Further, a power module capacitor C of the power moduleMBoth ends can all connect voltage-sharing resistance in parallel, reach the voltage-sharing effect of precharge in-process module. Therefore, the first resistor R1 and the second resistor R2 can also serve as voltage-sharing resistors of the power module while voltage-dividing power supply is performed, and the system loss is not additionally increased. The first resistor R1 and the second resistor R2 can be single resistors or can be in a resistor series-parallel structure, so that the redundancy of the loop is improved.
Further, the power semiconductor unit may be a half-bridge connection type including at least two power semiconductor devices, or a full-bridge connection type including at least four power semiconductor devices.
The invention also discloses a control method of the power module redundant energy supply circuit based on the breakdown diode, which comprises the following steps:
(1) before the power module is started, the power board card has a fault, and the bypass function is implemented by the following steps:
step 1: the power module starts to be precharged, and the power module capacitor CMThe voltage begins to rise, and the power board card fails to work; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging;
step 2: power module capacitor CMThe voltage rises to the first breakdown diode DBOBreakdown voltage, first breakdown diode DBOBreakdown action is carried out, and the board card is controlled to work in a charged mode; bypass switch energy storage capacitor CBContinuing to charge;
and step 3: the control board card detection protection unit detects that the power module has a fault, and sends fault state information to the superior control system, and the superior control system sends a bypass command after receiving the fault state information;
and 4, step 4: bypass switch energy storage capacitor C detected by control board card detection protection unitBAfter the voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, the control board card communication unit sends a bypass switch K to a superior control systemBA position signal; the system continues to operate.
(2) When the power module fails in the operation process, the bypass function is implemented by the following steps:
step 1: the power module starts to be precharged, and the power module capacitor CMThe voltage begins to rise, and the input undervoltage of the power board card is not started; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging;
step 2: power module capacitor CMThe voltage rises above the starting voltage of the power supply board card, the power supply board card works normally, and the energy storage capacitor C is supplied to the bypass switchBCharging of electricitySupplying power to the control board card; energy storage capacitor C for secondary supply bypass switch of redundant energy supply circuitBThe charging state is automatically exited;
and step 3:
the following conditions are: the control board card detection protection unit detects that the power module is in fault and the power board card is normal;
case two: when the power supply board card fails, the power loss of the board card is controlled, and the power module capacitor CMThe voltage rises to the first breakdown diode DBOBreakdown voltage, first breakdown diode DBOBreakdown action is carried out, and the board card is controlled to recover to work; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are divided and then automatically put into the bypass switch energy storage capacitor C through the connecting moduleBContinuing to charge;
and 4, step 4: the control board card sends fault state information to a superior control system; the superior control system receives the fault state information and then issues a bypass command, and the control board card detection protection unit detects the bypass switch energy storage capacitor CBThe voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, the control board card sends a bypass switch K to the superior control systemBA position signal; the system continues to operate.
Advantageous effects
By adopting the power module redundant energy supply circuit based on the breakdown diode, the problems of energy taking of the bypass switch energy storage capacitor and power supply of the power module control board card after the power module power board card fails are solved, and compared with the prior art, the power module redundant energy supply circuit has the following beneficial effects:
(1) the energy of the original voltage-sharing resistor loop is utilized to realize the redundant energy supply of the energy-storing capacitor of the bypass switch; the energy source of the closing action of the bypass switch is ensured;
(2) the power supply of the power module control board is realized by utilizing the breakdown diode; the protection triggering function and the state uploading function are guaranteed;
(3) the protection precision is high by utilizing the digital sampling of the control panel and the high-precision reference chip;
(4) in normal operation, the breakdown diode does not act, and only under an overvoltage condition, the breakdown diode acts to supply power to the power module control board, and the power module can be kept supplied with power until the voltage of the capacitor of the power module is reduced to a lower amplitude; the loss is not additionally increased, and the economy is realized;
(5) and a fully passive device is used, the circuit structure is simple and reliable, and control is not required to be increased.
Drawings
Fig. 1 is a schematic diagram of a power module redundant power supply circuit based on breakdown diodes.
Fig. 2 is a schematic diagram of an embodiment of the power module redundant power supply circuit based on the breakdown diode of the invention.
Fig. 3 is a logic diagram of a control method of the power module redundant energy supply circuit based on the breakdown diode.
Detailed Description
The following describes the embodiments in further detail with reference to the accompanying drawings.
Redundant energy-taking embodiment:
referring to fig. 1, the invention provides a power module redundant energy supply circuit based on breakdown diode, wherein the power module at least comprises a power semiconductor unit and a power module capacitor CMBypass switch KBThe power supply board card and the control board card; the bypass switch KBComprises a control coil and a bypass switch energy storage capacitor CBThe power supply board card supplies the control board card and the bypass switch energy storage capacitor CBThe power supply is realized, the output positive end of the power supply board card is connected with a bypass switch energy storage capacitor CBThe positive pole and the negative output terminal of the capacitor are connected with a bypass switch energy storage capacitor CBA negative electrode; the power module redundant energy supply circuit based on the breakdown diode is composed of a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator tube VD1 and a first breakdown diode DBOAnd a connection module; the connecting module is a diode, a lead, a mechanical switch, a relay, an electronic switch or a semiconductor controllable device; one end of the first resistor R1 and the power module capacitor CMThe anode is connected, the other end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with the power module capacitor CMThe negative electrodes are connected; the connection isOne end of the module is connected to the connection point of the first resistor R1 and the second resistor R2, and the other end of the module is connected to the bypass switch energy storage capacitor CBEnergy storage capacitor C of anode and bypass switchBThe negative electrode is connected to the power module capacitor CMA negative electrode; one end of the third resistor R3 is connected to the power module capacitor CMThe other end of the anode of the third resistor R3 is connected to the first breakdown diode DBOAnode, first breakdown diode DBOThe cathode is connected to the cathode of a first voltage regulator tube VD1, the anode of the first voltage regulator tube VD1 is connected to a power module capacitor CMA negative electrode; the cathode of the first voltage-stabilizing tube VD1 is connected to the positive input end of the control board card, and the anode of the first voltage-stabilizing tube VD1 is connected to the negative input end of the control board card.
Preferably, as shown in fig. 2, the connection module of the redundant energy supply circuit of the power module should adopt a diode or a series-parallel combination of diodes, the anode of the diode is connected to the connection point of the first resistor R1 and the second resistor R2, and the cathode of the diode is connected to the bypass switch energy storage capacitor CBAnd (4) a positive electrode. When the power supply board card works normally, and the power module capacitor CMWhen the voltage does not reach an overvoltage point, the output of the bypass power supply is higher than the voltage division values of the first resistor R1 and the second resistor R2, and the diode D2 is in a reverse blocking state, so that the influence of a redundant energy supply circuit on a power supply board card can be avoided; capacitor C of power moduleMWhen the voltage exceeds an overvoltage point, the redundant energy supply circuit can supply power, and a diode in the power supply board card can block the influence of the redundant energy supply circuit on the power supply board card; when the power supply board card breaks down, the diode inside the power supply board card is in a reverse blocking state, and the influence on a redundant energy supply circuit is avoided.
The embodiment of the control method comprises the following steps:
referring to fig. 3, the invention discloses a control method of a power module redundant energy supply circuit based on breakdown diodes,
(1) before the power module is started, the power board card has a fault, and the bypass function is implemented by the following steps:
step 1: the power module starts to be precharged, and the power module capacitor CMThe voltage begins to rise, and the power board card fails to work; second of redundant power supply circuitsA resistor R1 and a second resistor R2 are automatically switched in after voltage division through a connecting module to supply the bypass switch energy storage capacitor CBCharging;
step 2: power module capacitor CMThe voltage rises to the first breakdown diode DBOBreakdown voltage, first breakdown diode DBOBreakdown action is carried out, and the board card is controlled to work in a charged mode; bypass switch energy storage capacitor CBContinuing to charge;
and step 3: the control board card detection protection unit detects that the power module has a fault, and sends fault state information to the superior control system, and the superior control system sends a bypass command after receiving the fault state information;
and 4, step 4: bypass switch energy storage capacitor C detected by control board card detection protection unitBAfter the voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, the control board card communication unit sends a bypass switch K to a superior control systemBA position signal; the system continues to operate.
(2) When the power module fails in the operation process, the bypass function is implemented by the following steps:
step 1: the power module starts to be precharged, and the power module capacitor CMThe voltage begins to rise, and the input undervoltage of the power board card is not started; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging;
step 2: power module capacitor CMThe voltage rises above the starting voltage of the power supply board card, the power supply board card works normally, and the energy storage capacitor C is supplied to the bypass switchBCharging, namely supplying power to the control board card; energy storage capacitor C for secondary supply bypass switch of redundant energy supply circuitBThe charging state is automatically exited;
and step 3:
the following conditions are: the control board card detection protection unit detects that the power module is in fault and the power board card is normal;
case two: when the power supply board card fails, the power loss of the board card is controlled, and the power module capacitor CMThe voltage rises to the first breakdown diode DBOBreakdown voltage, first breakdown diode DBOBreakdown action is carried out, and the board card is controlled to recover to work; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are divided and then automatically put into the bypass switch energy storage capacitor C through the connecting moduleBContinuing to charge;
and 4, step 4: the control board card sends fault state information to a superior control system; the superior control system receives the fault state information and then issues a bypass command, and the control board card detection protection unit detects the bypass switch energy storage capacitor CBThe voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, the control board card sends a bypass switch K to the superior control systemBA position signal; the system continues to operate.
The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and various modifications or changes made with reference to the above embodiments are within the scope of the present invention.

Claims (6)

1. A power module redundant energy supply circuit based on a breakdown diode is disclosed, wherein the power module comprises a power semiconductor unit and a power module capacitor CMBypass switch KBA power supply board card and a control board card, and a bypass switch KBComprises a control coil and a bypass switch energy storage capacitor CBThe power supply board card supplies the control board card and the bypass switch energy storage capacitor CBThe power supply is realized, the output positive end of the power supply board card is connected with a bypass switch energy storage capacitor CBThe positive pole and the negative output terminal of the capacitor are connected with a bypass switch energy storage capacitor CBA negative electrode, characterized in that: the power module redundant energy supply circuit based on the breakdown diode is composed of a first resistor R1, a second resistor R2, a third resistor R3, a first voltage regulator tube VD1 and a first breakdown diode DBOAnd a connection module;
the connecting module is a diode, a lead, a mechanical switch, a relay, an electronic switch or a semiconductor controllable device;
one end of the first resistor R1 and the power module capacitor CMThe anode is connected, the other end of the first resistor R1 is connected with one end of the second resistor R2, and the other end of the second resistor R2 is connected with the anodeAnd a power module capacitor CMThe negative electrodes are connected;
one end of the connecting module is connected to the connection point of the first resistor R1 and the second resistor R2, and the other end of the connecting module is connected to the bypass switch energy storage capacitor CBEnergy storage capacitor C of anode and bypass switchBThe negative electrode is connected to the power module capacitor CMA negative electrode;
one end of the third resistor R3 is connected to the power module capacitor CMThe other end of the anode of the third resistor R3 is connected to the first breakdown diode DBOAnode, first breakdown diode DBOThe cathode is connected to the cathode of a first voltage regulator tube VD1, the anode of the first voltage regulator tube VD1 is connected to a power module capacitor CMA negative electrode; the cathode of the first voltage-stabilizing tube VD1 is connected to the positive input end of the control board card, and the anode of the first voltage-stabilizing tube VD1 is connected to the negative input end of the control board card.
2. The breakdown diode based power module redundant power supply circuit of claim 1, wherein: the control board card comprises a communication unit, a bypass trigger unit and a detection protection unit, and the bypass switch KBOne end of the control coil is connected to the bypass switch energy storage capacitor CBPositive pole, bypass switch KBThe other end of the control coil is connected to a controllable switch QBPositive pole of (2), controllable switch QBIs connected to the bypass switch energy storage capacitor CBNegative pole, the bypass trigger unit controls the controllable switch QBOn and off.
3. The breakdown diode based power module redundant power supply circuit of claim 1, wherein: the first resistor R1 and the second resistor R2 are respectively a single resistor or a structure formed by connecting a plurality of resistors in series and in parallel.
4. The breakdown diode based power module redundant power supply circuit of claim 1, wherein: the power semiconductor unit is in a half-bridge connection mode at least comprising two power semiconductor devices and in a full-bridge connection mode at least comprising four power semiconductor devices.
5. The method of controlling a breakdown diode based power module redundant power supply circuit of any one of claims 1-4, wherein: before the power module is started, the power board card fails, and the implementation of the bypass function comprises the following steps;
step 1: the power module starts to be precharged, and the power module capacitor CMThe voltage begins to rise, and the power board card fails to work; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging;
step 2: power module capacitor CMThe voltage rises to the first breakdown diode DBOBreakdown voltage, first breakdown diode DBOBreakdown action is carried out, and the board card is controlled to work in a charged mode; bypass switch energy storage capacitor CBContinuing to charge;
and step 3: the control board card detection protection unit detects that the power module has a fault, and sends fault state information to the superior control system, and the superior control system sends a bypass command after receiving the fault state information;
and 4, step 4: bypass switch energy storage capacitor C detected by control board card detection protection unitBAfter the voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, the control board card communication unit sends a bypass switch K to a superior control systemBA position signal; the system continues to operate.
6. The method of controlling a breakdown diode based power module redundant power supply circuit of any one of claims 1-4, wherein: when the power module is in a fault in the operation process, the implementation of the bypass function comprises the following steps;
step 1: the power module starts to be precharged, and the power module capacitor CMThe voltage begins to rise, and the input undervoltage of the power board card is not started; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are automatically switched in through the connecting module after voltage division, and the energy storage capacitor C of the bypass switch is suppliedBCharging;
step 2: power module capacitor CMThe voltage rises above the starting voltage of the power supply board card, the power supply board card works normally, and the energy storage capacitor C is supplied to the bypass switchBCharging, namely supplying power to the control board card; energy storage capacitor C for secondary supply bypass switch of redundant energy supply circuitBThe charging state is automatically exited;
and step 3:
the following conditions are: the control board card detection protection unit detects that the power module is in fault and the power board card is normal;
case two: when the power supply board card fails, the power loss of the board card is controlled, and the power module capacitor CMThe voltage rises to the first breakdown diode DBOBreakdown voltage, first breakdown diode DBOBreakdown action is carried out, and the board card is controlled to recover to work; the first resistor R1 and the second resistor R2 of the redundant energy supply circuit are divided and then automatically put into the bypass switch energy storage capacitor C through the connecting moduleBContinuing to charge;
and 4, step 4: the control board card sends fault state information to a superior control system; the superior control system receives the fault state information and then issues a bypass command, and the control board card detection protection unit detects the bypass switch energy storage capacitor CBThe voltage meets the closing condition, the bypass trigger unit triggers the bypass switch KBSwitching on, the control board card sends a bypass switch K to the superior control systemBA position signal; the system continues to operate.
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CN108111007B (en) * 2018-01-31 2020-09-08 南京南瑞继保电气有限公司 Power module redundancy energy-taking circuit and control method
CN108539968B (en) * 2018-03-21 2020-04-14 华为技术有限公司 Switching power supply and control method thereof

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