TWI747014B - Redundant power supply device and its abnormal protection control method - Google Patents

Abstract

The redundant power supply device of the present invention includes a power output port, a power conversion unit, a comparison unit, and an output protection switch. The output protection switch is electrically connected between an output terminal of the power conversion unit and the power output port, and the comparison unit Compare the voltage at both ends of the output protection switch and control whether the output protection switch is turned on or not; the redundant power supply device also has a control module to implement the abnormal protection control method, when it is judged that the voltage of the power output port is greater than the set voltage value and the output current Less than the set current value, the control module outputs a short-term shutdown signal to the consistent end of the comparison unit to avoid the slow rise of the external abnormal voltage, which causes the comparison unit to fail to correctly compare the voltage at both ends of the output protection switch to ensure redundancy The power supply device operates normally.

Description

Redundant power supply device and its abnormal protection control method

A power supply device and its control method, especially a redundant power supply device and its abnormal protection control method.

The redundant power supply system of the prior art includes a plurality of power supply units and a load, and the plurality of power supply units are connected in parallel and output current at the same time to evenly share the electric energy required to provide the load. Among them, the power supply unit with hot plug and parallel function can be cut out of the system by cutting off the Oring output protection switch when the power supply unit has an abnormal state, and the other power supply units immediately increase the output power to maintain Power supply to the load. Please refer to 7, the redundant power supply system includes a first power supply unit 51 and a second power supply unit 52, the first power supply unit 51 has a first output port O/P1, and includes a second A voltage converter 511, a first output protection switch 512, and a first comparator 513, opposite ends of the first output protection switch 512 are electrically connected to the first output port O/P1 and the first voltage converter, respectively 511 is a first output terminal 510.

The first comparator 513 compares the voltages of the first output terminal 510 of the first voltage converter 511 and the first output port O/P1, that is, the voltages across the first output protection switch 512. When the voltage of the first output port O/P1 is greater than the voltage of the first output terminal 510 of the first voltage converter 511, it means that the current may be fed back into the first power supply unit 51 from the first output port O/P1. Then, the output terminal of the first comparator 513 outputs a shutdown signal to a control terminal G1 of the first output protection switch 51 to turn off the first output protection switch 512 to protect the first power supply unit 51. Similarly, the second power supply unit 52 has a second output port O/P2 and includes a second voltage converter 521, a second output protection switch 522 and a second comparator 523, opposite ends of the second output protection switch 522 are electrically connected to the second output port O/P2 and the second voltage converter 521 The output terminal 520. The first output port O/P1 of the first power supply unit 51 and the second output port O/P2 of the second power supply unit 52 are connected in parallel to an output bus BUS, and a load is provided through the output bus BUS power supply. The connection and operation of the second power supply unit 52 are similar to those of the first power supply unit 51, and will not be repeated here.

Please refer to FIG. 8 together, where Vo1 and Vo2 are the voltage of the output terminal 510 of the first voltage converter 511 and the voltage of the second output terminal 520 of the second voltage converter 521, respectively, and I1, I2 are the first The output currents of an output port O/P1 and the second output port O/P2, VG1 and VG2 are the control terminal voltages of the first output protection switch 512 and the second output protection switch 522, respectively.

It is assumed that when the second power supply unit 52 is aging due to internal components, for example, the components of the feedback module of the second voltage converter 521 are aging, which will cause its output voltage to rise slowly. When the load is extremely light or no-load, at about time t1, when the voltage Vo2 of the second output terminal 520 of the second voltage converter 521 starts to rise to exceed the rated output voltage, the first power supply The unit 51 stops outputting current; because the load is extremely light or no-load, the output current of the second power supply unit 52 is extremely small, and the output current of the second power supply unit 52 is fed back to the first power supply unit 51 and passed through the first output protection switch 512 in the reverse direction. The current is also extremely small, and the voltage at the second output terminal 520 of the second voltage converter 521 rises slowly, the voltage across the first output protection switch 512 is close to zero, and the first comparator 513 of the first power supply unit 51 cannot determine The voltage difference between the two ends of the first output protection switch 51, therefore the first comparator 513 will not output a shutdown signal to the control terminal of the first output protection switch 513, the first output protection switch 513 remains open, and the first voltage conversion The output voltage Vo1 of the voltage converter 511 is equal to the output voltage Vo2 of the second voltage converter 521; further, at time t4, when the output voltage Vo2 of the second voltage converter 521 continues to rise to the first power supply unit 51 The overvoltage protection threshold of the first power supply unit 51 is triggered, the first power supply unit 51 will stop working, and the first voltage converter 511 stops the voltage conversion, and the output voltage Vo1 drops to 0; at time t5, when the output voltage Vo2 of the second voltage converter 521 further rises to reach its own overvoltage protection threshold, the second power supply unit 52 will also stop working At this time, both the first power supply unit 51 and the second power supply unit 52 stop working, the load cannot receive any power input, and the redundant power supply system as a whole is down and loses its effectiveness.

In short, when the load of a redundant power supply system is extremely light, and the output voltage of one of the abnormal power supply units rises very slowly, it may eventually cause the system to be abnormal and the power supply unit that is actually functioning normally stops. Output electric energy, which in turn makes the redundant power supply system as a whole lose its function. Therefore, the redundant power supply system in the prior art must be further improved.

In order to solve the above-mentioned problems, the main purpose of the present invention is to provide a redundant power supply device, which can solve any redundant power supply device in the redundant power supply system due to the abnormal increase of the output port voltage due to the aging of the components, and the system may be paralyzed. The problem of all redundant power supply devices in the

The technical means adopted to achieve the foregoing objective is to make the redundant power supply device include a power output port, a power conversion unit, a comparison unit, an output protection switch and a control module. The power conversion unit has an output terminal, the output protection switch has a first terminal, a second terminal and a control terminal. The first terminal is electrically connected to the output terminal, and the second terminal is electrically connected to the power supply output port. The comparison unit has a positive input terminal, a negative input terminal, a consistent energy terminal and a comparison output terminal. The positive input terminal is electrically connected to the output terminal of the power conversion unit, and the negative input terminal is electrically connected to the power supply output port. The output terminal is electrically connected to the control terminal of the output protection switch. The control module is electrically connected to the power supply output port and the enable terminal of the comparison unit; wherein, when the voltage of the power supply output port is greater than a set voltage value, and an output current output by the power supply output port is lower than a set current Value, the control module outputs a brief shutdown signal to the enable terminal of the comparison unit.

When two or more of the aforementioned redundant power supply devices are connected in parallel to form a redundant power supply system, if one of the redundant power supply devices is abnormal and the output voltage rises slowly, the normal redundant power supply device can be very effective. Quickly turn off the output protection switch for a short time according to the output current drop and the output port voltage rise, and the over-voltage protection will not be triggered due to the abnormal external voltage, so as to avoid abnormally stopping the work of the power conversion unit. And after the control module outputs a brief shutdown signal to the enable terminal of the comparison unit, the comparison unit continues to operate normally, and continues to turn off the output according to the still higher output port voltage and lower internal output terminal voltage The protection switch is turned off until the abnormal redundant power supply device triggers its own overvoltage protection mechanism. The output port voltage drops, and the comparison unit of the normal redundant power supply device drops below the power conversion due to the output port voltage drop The output terminal voltage of the unit turns on the output protection switch again, so that the normal redundant power supply device continuously maintains the power supply of the load. In this way, it can be avoided that the load cannot receive power output when there is actually a normal redundant power supply device, and the function of the redundant power supply system is stable and normal.

Another object of the present invention is to provide a redundant power supply device abnormal protection control method that can ensure system stability.

To achieve the aforementioned technical means, the aforementioned method includes the following steps: detecting the voltage of a power output port; detecting the output current of the power output port; judging whether the voltage of the power output port is greater than a set voltage value, and determining Whether the output current is less than a set current value; when the power supply output port voltage is greater than the set voltage value and the output current is less than the set current value, a short-term shutdown signal is output to an output protection switch.

When the voltage of the power output port of the redundant power supply device is greater than a set voltage value, and its output current is less than the set current value, it means that the voltage of the power output port is higher than the rated voltage. The output voltage from the redundant power supply device itself, but from the output voltage of another redundant power supply device connected in parallel, causes the output port voltage to rise and the output current to drop. Therefore, a shutdown signal is output to the output protection switch for a short time. When the output protection switch is temporarily closed to form a circuit break, the redundant power supply device no longer receives abnormally high voltage from the outside, so that a voltage is generated across the output protection switch. And trigger the output protection mechanism of the redundant power supply device to turn off the output protection switch to avoid being triggered by an abnormal high voltage from other redundant power supply devices to trigger its own overvoltage protection mechanism to shut down the entire redundant power supply device. Since the redundant power supply device still operates normally inside, when the external abnormal high voltage drops, the redundant power supply device can output electric energy as long as the output protection switch is turned on again, ensuring the normal operation of the entire redundant power supply system.

10: Redundant power supply device

O/P: Power output port

11: Power conversion unit

110: output

12: Comparison unit

op: amplifier

inv: inverter

Q1: The first switch

Vin1: High potential signal input terminal

Vin2: Low potential signal input terminal

R1: first resistance

R2: second resistor

gnd: ground terminal

13: Control module

131: current sensing unit

Rt: Sensing resistance

1311: current sensing processor

132: Processor

Qout: output protection switch

Qout’: Switching element

G1: Control terminal

BUS: output bus

20: The second redundant power supply device

O/P2: The second power supply output port

21: The second power conversion unit

210: second output

22: The second comparison unit

23: The second control module

Qout2: The second output protection switch

G2: Control terminal

51: The first power supply unit

O/P1: The first output port

511: The first voltage converter

510: First output

512: First output protection switch

513: first comparator

52: The second power supply unit

O/P2: second output port

521: second voltage converter

520: second output

522: Second output protection switch

523: second comparator

Fig. 1 is a schematic circuit diagram of a redundant power supply device of the present invention.

Fig. 2 is a schematic diagram of a redundant power supply system circuit applying the redundant power supply device of the present invention.

FIG. 3 is a schematic diagram of the waveforms of the use state of the redundant power supply system applying the redundant power supply device of the present invention.

4 is a schematic circuit diagram of a first preferred embodiment of the redundant power supply device of the present invention.

FIG. 5 is a schematic flowchart of the abnormal protection control method of the redundant power supply device of the present invention.

6 is a schematic flowchart of a first preferred embodiment of the abnormal protection control method of the redundant power supply device of the present invention.

Fig. 7 is a circuit diagram of a redundant power supply system in the prior art.

FIG. 8 is a schematic diagram of waveforms of the use state of a redundant power supply system in the prior art.

Please refer to FIG. 1, the redundant power supply device 10 of the present invention includes a power output port O/P, a power conversion unit 11, an output protection switch Qout, a comparison unit 12 and a control module 13. Wherein, the power conversion unit 11 is used to convert an input voltage and output a converted voltage, and has There is an output terminal 110. The output protection switch Qout has a first terminal, a second terminal, and a control terminal G1. The first terminal is electrically connected to the output terminal 110 of the power conversion unit 11, and the second terminal is electrically connected to The power supply output port O/P enables the output end of the power conversion unit 11 to be electrically connected to the power supply output port O/P through the output protection switch Qout to output electric energy. The comparison unit 12 has a positive input terminal, a negative input terminal, a consistent energy terminal and a comparison output terminal. The positive input terminal is electrically connected to the power supply output port O/P, the negative input terminal is electrically connected to the output terminal of the power conversion unit 11, and the comparison output terminal is electrically connected to the control terminal G1 of the output protection switch Qout. The control module 13 is electrically connected to the power output port O/P and the enable terminal of the comparison unit 12. When the voltage of the power supply output port O/P is greater than a set voltage value, and the output current output by the power supply output port O/P is lower than a set current value, the control module 13 enables the comparison unit 12 A short turn-off signal is output.

Wherein, preferably, the set voltage value is greater than a range of a rated output voltage of the redundant power supply device 10 and lower than an overvoltage protection threshold of the redundant power supply device 10. In this way, before the voltage of the power output port O/P increases to the overvoltage protection threshold, the judgment condition of the control module 13 can be met, so as to prevent the overvoltage protection mechanism of the redundant power supply device 10 from being triggered. the goal of.

In addition, the set current value is preferably set according to the current withstand value of a parasitic diode of the output protection switch Qout to avoid the output current being greater than the rated withstand current value of the parasitic diode when the output protection switch Qout is turned off. The output protection switch Qout is damaged.

Hereinafter, the operation mode of the redundant power supply device of the present invention will be described in further detail, and a redundant power supply system with two sets of redundant power supply devices will be taken as an example to illustrate the effects achieved by the present invention.

Please refer to FIG. 2 which is a schematic circuit diagram of a redundant power supply system, which includes two redundant power supply devices of the present invention, the redundant power supply device 10 and a second redundant power supply device 20 respectively. Wherein, the second redundant power supply device 20 includes a second power output port O/P2, and a second Two power conversion units 21, a second output protection switch Qout2, a second comparison unit 11, and a second control module 23. The structure of the second redundant power supply device 20 is the same as that of the redundant power supply device 10, which The connection method will not be repeated here. In the redundant power supply system, the redundant power supply device 10 and the second redundant power supply device 20 are commonly electrically connected to an output bus BUS, and power is provided to a load through the output bus BUS.

Assuming that the redundant power supply device 10 is operating normally, the second redundant power supply device 20 has an abnormally slow rise in output voltage due to aging of components.

Please also refer to FIG. 3, which is a voltage and current waveform diagram of multiple related nodes in the redundant power supply system. Among them, VBUS is the output bus BUS voltage and is equal to the voltage of the power supply output port O/P and the second power supply output port O/P2, Vo1 is the voltage of the output terminal 110 of the redundant power supply device 10, and Vo2 is the first The voltage of the output terminal 210 of the second power conversion unit 21, I1 is the output current of the power output port O/P, I2 is the output current of the second power output port O/P2, VG1 is the voltage of the control terminal G1 of the output protection switch Qout, VG2 Is the voltage of a control terminal G2 of the second output protection switch Qout2, Ven1 is the enable terminal voltage of the comparison unit 12, and Ven2 is the enable terminal voltage of the second comparison unit 12.

The following describes the states of voltage and current at different points in the redundant power supply system.

0<T<t1: The redundant power supply device 10 and the second redundant power supply device 20 are normal, the output terminal 110 voltage Vo1 of the power conversion unit 11 and the output terminal 210 voltage Vo2 of the second power conversion unit 21 When the voltages are equal, the first output current I1 and the second output current I2 are also equal.

t1<T<t2: The voltage Vo2 of the output terminal 210 of the second power conversion unit 21 starts to rise slowly due to abnormal conditions, and when the voltage Vo2 of the output terminal 210 of the second power conversion unit 21 increases to slightly higher than the power conversion The output terminal 110 voltage Vo1 of the unit 11, the power output port O/P of the redundant power supply device 10 can no longer output current, and the output current I1 drops to 0. The current output from the output bus BUS to the load is completely determined by this The second redundant power supply device 20 is provided. Since there is no current at this time, the output protection switch When Qout passes, the output terminal voltage Vo1 of the power conversion unit 11 is equal to the output terminal 210 voltage Vo2 of the second power conversion unit 21, and slowly rises with the output terminal 210 voltage Vo2 of the second power conversion unit 21.

T=t2: The voltage Vo1 of the output terminal 110 of the power conversion unit 11 reaches the set voltage value VPRO, and the output current I1 of the power output port O/P is close to 0, so it is less than the set current value.

t2<T<t3: The control module 13 outputs a short turn-off signal to the enable terminal of the comparison unit 12, as shown by the waveform of the enable terminal voltage Ven1, because the enable terminal of the comparison unit 12 outputs a The shutdown signal, the comparison output terminal of the comparison unit 12 is a low-level shutdown signal, and the control terminal G1 voltage VG1 of the output protection switch Qout also receives the shutdown signal. When the output protection switch Qout is not turned on, the output voltage Vo1 of the power conversion unit 11 is no longer affected by the output voltage Vo2 of the second redundant power supply device 20, and the output voltage Vo1 of the power conversion unit 11 returns to power conversion Normal output voltage of unit 11.

t3<T<t4: The short turn-off signal of the enable terminal of the comparison unit 12 ends, the control module 13 outputs an on signal to the comparison unit 12, and the voltage of the power supply output port O/P is equal to the output bus voltage VBUS, that is, the voltage Vo2 of the output terminal 210 of the abnormal second power conversion unit 21, the comparison unit 12 according to the power supply output port O/P voltage is greater than the output voltage Vo1 of the power conversion unit 11, the comparison unit 12 continues to The control terminal G1 of the output protection switch Qout outputs a shutdown signal, as shown by the VG1 waveform.

T=t5: The output voltage Vo2 of the second redundant power supply device 20 reaches the overvoltage protection threshold Vop, the second redundant power supply device 20 is turned off and no longer outputs current and voltage, and the output bus voltage VBUS drops , The power output port O/P voltage is lower than the output terminal voltage Vo1 of the power conversion unit 11, the comparison unit 12 again outputs an on signal to the control terminal G1 of the output protection switch Qout, the output protection switch Qout is turned on, the The redundant power supply device 10 continues to the second redundant power supply device 20 that was shut down due to overvoltage and continues to output electrical energy to the output bus BUS.

It can be seen from the above description that when one of the redundant power supply devices 20 causes the output voltage to rise slowly due to an abnormal situation, so that the other normal redundant power supply device 10 cannot output current and cannot trigger the shutdown of the output protection switch Qout, by checking The enable terminal of the comparison unit 12 of the normal redundant power supply device 10 outputs a short turn-off signal to actively trigger the cut-off of the output protection switch Qout. In this way, when the output voltage of the redundant power supply device 20 is abnormal When the overvoltage protection is triggered and turned off, the normal redundant power supply device 10 can turn on the output protection switch Qout again to maintain the power supply to the load through the output bus BUS. Therefore, as shown by the output bus BUS voltage VBUS in FIG. 3, the output bus BUS maintains electrical energy output to ensure that the electrical energy supply to the load is not interrupted.

Please refer to FIG. 4, which is a circuit diagram of a preferred embodiment of the redundant power supply device of the present invention. The control module 13 includes a current sensing unit 131 and a processor 132. The current sensing unit 131 is electrically connected between the output terminal of the power conversion unit 11 and the power output port O/P. The unit 131 generates a current sensing signal according to the current flowing from the output terminal to the first terminal of the output protection switch Qout. The processor 132 is electrically connected to the enable terminal of the comparison unit 12, the power output port O/P, and is electrically connected to the current sensing unit 131 to receive the current sensing signal. The processor 132 determines the output current of the power output port O/P according to the current sensing signal, and determines the voltage of the power output port O/P, when the output current is lower than the set current value, and the power output port When the O/P voltage is greater than the set voltage value, the processor 132 generates the temporary shutdown signal and outputs it to the enable terminal of the comparison unit 12.

In this preferred embodiment, the output protection switch Qout includes a plurality of switching elements Qout' connected in parallel to reduce the output load and improve the efficiency of electric energy output. Preferably, each of the switching elements Qout' is an N-channel metal oxide semiconductor field effect transistor (NMOS), which has a drain, a source, and a gate, respectively. And the drain of each switch element Qout’ is electrically connected to the output protection switch Qout The source of each switching element Qout’ is electrically connected to the second end of the output protection switch Qout, and the gate of each switching element Qout’ is electrically connected to the control terminal G1 of the output protection switch Qout.

In addition, the current sensing unit 131 includes a sensing resistor Rt and a current sensing processor 1311. The output terminal of the power conversion unit 11 is electrically connected to the first terminal of the output switch through the sensing resistor Rt. The current sensing processor 1311 generates the current sensing signal according to the voltage difference between the two ends of the sensing resistor Rt.

Preferably, the comparison unit 12 includes an amplifier op, an inverter inv, a first switch Q1, a high potential signal input terminal Vin1, a low potential signal input terminal Vin2, a first resistor R1, a second Resistance R2. The amplifier op has a first input terminal, a second input terminal and an amplified output terminal. The first input terminal and the second input terminal of the amplifier op are electrically connected to the first terminal and the second terminal of the output protection switch Qout, respectively. The high potential signal input terminal Vin1 is electrically connected to the control terminal G1 of the output protection switch Qout through the first resistor R1, and the first switch Q1 is electrically connected to the control terminal G1 of the output protection switch Qout and the low potential signal input terminal Vin2 In between, the amplified output terminal of the amplifier op is electrically connected to a control terminal of the first switch Q1.

The inverter inv has a uniform energy signal input terminal, a uniform energy control terminal, and a ground terminal gnd. The enable signal input terminal is the enable terminal of the comparison unit 12, and the enable control terminal is electrically connected through the second resistor R2. Connect the control terminal G1 of the output protection switch Qout. When the inverter inv receives a shutdown signal of the control module 13 from the enable signal input terminal, the inverter inv turns on the enable control terminal and the ground terminal gnd, so that the output protection switch Qout The voltage of the control terminal G1 is a divided voltage of the high potential signal input terminal Vin1 through the first resistor R1 and the second resistor R2, and the divided voltage is lower than the turn-on voltage of the output protection switch Qout, the output protection switch Qout is not turned on And form an open circuit.

In general, when the voltage of the power output port O/P is greater than the voltage of the output terminal of the power conversion unit 11, it means that the power output port O/P receives an abnormally high voltage greater than the set voltage value, and the amplifier op is turned on The first switch Q1, the first switch Q1 turns on the output protection switch The control terminal G1 of Qout and the low potential signal input terminal Vin2 enable the control terminal G1 of the output protection switch Qout to receive a low potential signal and form an open circuit to ensure that the abnormal high voltage received by the power output port O/P will not The reverse flow into the power conversion unit 11 causes damage to the power conversion unit 11 or other internal circuits.

In the aforementioned abnormal situation, that is, the output voltage of another parallel redundant power supply device rises slowly, and the voltage of the output bus BUS rises slowly and makes the normal redundant power supply device unable to output current, even if The voltage of the power output port O/P of the normal redundant power supply device rises to slightly greater than the rated output voltage, because there is no current through the output protection switch Qout, or the abnormal redundant power supply device flows in reversely. The output current is extremely small, and the voltage difference between the two ends of the output protection switch Qout cannot actually trigger the amplifier op and outputs a signal to the first switch Q1 to turn off the output protection switch Qout; at this time, the processor 132 determines the power supply output Port O/P is greater than the set voltage value voltage, and the output current is judged to be lower than the set current value according to the current sensing signal, so the processor 132 outputs a short turn-off signal to the enable signal input terminal of the inverter inv , The inverter inv turns on the ground terminal gnd, and makes the voltage of the control terminal G1 of the output protection switch Qout lower than its turn-on voltage, the output protection switch Qout forms an open circuit, and the voltage difference between the two ends of the output protection switch Qout is The difference between the O/P voltage of the power supply output port and the output terminal voltage of the power conversion unit 11.

Further, when the short turn-off signal ends, the inverter inv no longer turns on the ground terminal gnd, because the voltage difference between the two ends of the output protection switch Qout is the difference between the O/P voltage of the power supply output port and the power conversion unit 11 The output terminal voltage difference, so the amplifier op turns on the first switch Q1, the control terminal G1 voltage of the output protection switch Qout is equal to the low-level signal input terminal Vin2, and the output protection switch Qout remains in an open state , Until the abnormal redundant power supply device triggers its own over-voltage protection mechanism and shuts down, the voltage of the output bus BUS and the power output port O/P drops below the output terminal voltage of the voltage conversion unit, and the amplifier op turns off the first switch again Q1, the output protection switch Qout is turned on, and the normal redundant power supply device continues to supply power to the output bus BUS.

Based on the above, the present invention also provides a redundant power supply device abnormal protection method, which is executed by the aforementioned redundant power supply device. Please refer to FIG. 5. The method includes the following steps: detecting the power supply output port O /P voltage (S501); detect the output current of the power output port O/P (S502); determine whether the power output port O/P voltage is greater than a set voltage value, and determine whether the output current is less than a set current Value (S503); when the power output port O/P voltage is greater than the set voltage value and the output current is less than the set current value, a short-term shutdown signal is output to the output protection switch (S504).

When the redundant power supply device is extremely light-loaded or no-load, and the voltage of its power output port O/P is greater than the set voltage value, and its output current is less than the set current, it means that the power output port O/P The voltage higher than the rated voltage does not come from the output voltage of the redundant power supply device itself, but from the output voltage of another redundant power supply device connected in parallel, which causes the output port voltage to rise and the output current to drop. Therefore, the control module temporarily outputs a shutdown signal to the output protection switch Qout, and the time of the shutdown signal is determined according to the shutdown delay time in the specifications of the output protection switch Qout, that is, the shutdown signal only needs to be sufficient to make the The output protection switch Qout is turned off to form an open circuit. The internal voltage of the redundant power supply device no longer receives abnormally high voltage from the outside. The output protection switch Qout generates a voltage difference between both ends, so the redundant power supply device's output protection The mechanism will be triggered. In this way, when the short turn-off signal ends, the output protection switch Qout is still closed due to the output protection mechanism, and remains closed when another abnormal redundant power supply device still outputs an abnormally higher voltage. Preferably, in the step of determining that the current of the power supply output port is less than the set current value, it is determined that the current of the power supply output port is between zero current and the set current value.

Please refer to FIG. 6, the redundant power supply device abnormal protection method further includes the following steps: after the redundant power supply device outputs a short turn-off signal to the output protection switch Qout, the output protection switch Qout is continuously maintained In the closed state (S505).

The closed state is an output protection mechanism implemented based on the O/P voltage of the power output port being higher than the internal voltage of the redundant power supply device at this time.

Continuing to refer to FIG. 6, further, the redundant power supply device abnormal protection method further includes the following steps: determining whether the voltage of the power supply output port O/P is lower than the set voltage value (S506); when the power supply output port The O/P voltage is lower than the set voltage value, and an on signal is output to the output protection switch (S507).

When the voltage of the power supply output port O/P drops back to the set voltage value, this situation may be when the abnormal redundant power supply device triggers its own over-voltage protection mechanism and shuts down due to the continuous rise of the output voltage. The output bus voltage drops, and the output protection switch outputs an open signal at this time, so that the normal redundant power supply device outputs electrical energy to connect the power supply to the load through the output bus BUS, so as to maintain the redundant power supply The overall normal operation of the supply system ensures the purpose of power supply.

The above are only the preferred embodiments of the present invention and do not limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the professional technology Personnel, without departing from the scope of the technical solution of the present invention, when the technical content disclosed above can be used to make slight changes or modification into equivalent embodiments with equivalent changes, but any content that does not deviate from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes, and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

10: Redundant power supply device

11: Power conversion unit

110: output

12: Comparison unit

13: Control module

Qout: output protection switch

G1: Control terminal

O/P: Power output port

Claims (10)

A redundant power supply device abnormal protection control method includes the following steps: detecting the voltage of a power supply output port; detecting the output current of the power supply output port; judging whether the voltage of the power supply output port is greater than a set voltage value, and judging Whether the output current is less than a set current value; when the voltage of the power supply output port is greater than the set voltage value, and the output current is less than the set current value, a short shutdown signal is output to an output protection switch to trigger the redundancy An output protection mechanism of the power supply device; after outputting the brief shutdown signal to the output protection switch, when the voltage of the power output port is greater than an internal voltage of the redundant power supply device, the output protection mechanism keeps the output The protection switch maintains a closed state; wherein, in the step of determining that the current of the power output port is less than the set current value, it is determined that the current of the power output port is between zero current and the set current value. The redundant power supply device abnormal protection control method according to claim 1, further comprising the following steps: determining whether the voltage of the power supply output port is lower than the set voltage value; when the voltage of the power supply output port is lower than the set voltage value , Output a turn-on signal to the output protection switch. The redundant power supply device abnormal protection control method according to claim 1, wherein, when the redundant power supply device is light-loaded or no-load, the voltage of the power supply output port is greater than the set voltage value, and the output current is less than The set current value will output the short shutdown signal. The redundant power supply device abnormal protection control method according to claim 1, wherein in the step of determining that the voltage of the power output port is greater than the set voltage value, it is determined that the voltage of the power output port is greater than the set voltage value and less than one Overvoltage protection value. The redundant power supply device abnormal protection control method according to claim 1, wherein the set current value is set according to a parasitic diode current withstand value of the output protection switch. The redundant power supply device abnormal protection control method according to claim 1, wherein the time length of the short turn-off signal is determined according to the turn-off delay time of the output protection switch. A redundant power supply device includes: a power output port; a power conversion unit with an output terminal; an output protection switch with a first terminal, a second terminal and a control terminal, the first terminal is electrically connected The output terminal, the second terminal is electrically connected to the power supply output port; a comparison unit having a positive input terminal, a negative input terminal, a consistent energy terminal and a comparison output terminal, the positive input terminal is electrically connected to the power conversion unit The output terminal, the negative input terminal is electrically connected to the power supply output port, the comparison output terminal is electrically connected to the control terminal of the output protection switch; a control module is electrically connected to the power supply output port and the enable terminal of the comparison unit; wherein, When the voltage of the power supply output port is greater than a set voltage value, and an output current output by the power supply output port is less than a set current value, the control module outputs a brief shutdown signal to the enable terminal of the comparison unit, so that the The comparison unit outputs a brief shutdown signal to the control terminal of the output protection switch; and after outputting the brief shutdown signal to the output protection switch, when the voltage of the power supply output port is greater than the voltage of the output terminal of the power conversion unit, the The comparison unit continues to maintain the output protection switch in the off state. The redundant power supply device according to claim 7, wherein the control module includes: A current sensing unit is electrically connected between the output terminal of the power conversion unit and the power supply output port, and generates a current sensing signal according to the current from the output terminal to the power supply output port; a processor is electrically connected to the The enabling terminal of the comparing unit, the current sensing unit and the power supply output port; wherein the processor determines the output current of the output port according to the current sensing signal, when the processor determines that the voltage of the power supply output port is greater than When the set voltage value and the output current are lower than the set current value, the processor generates the brief shutdown signal. In the redundant power supply device according to claim 7, the comparison unit includes: an amplifier having a first input terminal, a second input terminal, and an amplified output terminal, the first input terminal is electrically connected to the output protection switch The second input terminal is electrically connected to the second terminal of the output protection switch; a low-potential signal input terminal; a first switch is electrically connected to the control terminal of the output protection switch and the low-potential signal input terminal There is a control terminal which is electrically connected to the amplified output terminal of the amplifier; a first resistor; a high-potential signal input terminal which is electrically connected to the control terminal of the output protection switch through the first resistor; When the voltage of the second input terminal of the amplifier exceeds the voltage-output protection threshold value of the first input terminal, the amplifier turns on the first switch. According to the redundant power supply device according to claim 9, the comparing unit further includes: a second resistor; An inverter has a uniform energy signal input terminal, a uniform energy control terminal, and a ground terminal. The enable signal input terminal is the enable terminal of the comparison unit, and the enable control terminal is electrically connected to the second resistor through the The control terminal of the output protection switch; wherein, when the inverter receives the shutdown signal of the control module from the enable signal input terminal, the inverter conducts the enable control terminal and the ground terminal.

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