CN112953190B - PFC power supply module starting surge suppression method - Google Patents

PFC power supply module starting surge suppression method Download PDF

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Publication number
CN112953190B
CN112953190B CN202011641339.1A CN202011641339A CN112953190B CN 112953190 B CN112953190 B CN 112953190B CN 202011641339 A CN202011641339 A CN 202011641339A CN 112953190 B CN112953190 B CN 112953190B
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voltage
power supply
input
supply module
output
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CN112953190A (en
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宋栋梁
臧晓敏
崔荣明
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Shenzhen Haowen Electronics Co ltd
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Shenzhen Haowen Electronics 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
    • H02M1/36—Means for starting or stopping 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • 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
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The invention relates to a method for inhibiting starting surge of a PFC power supply module, which comprises the following steps: selecting or obtaining a first set value; continuously collecting voltage values of output voltage and input voltage; after the input voltage reaches the peak value, comparing whether the difference value between the current input voltage and the output voltage is larger than the first set value or not, and if so, executing the next step; outputting a control signal to control a rectifier device of the power supply to be connected into a rectifier circuit and charge a first capacitor; and if the current input voltage is smaller than the difference between the current output voltage and the first set value, turning off the rectifying device, and if not, maintaining the control signal. The implementation of the method for inhibiting the starting surge of the PFC power supply module has the following beneficial effects: the surge suppression can be performed without using a surge switch, and the waveform distortion is small.

Description

PFC power supply module starting surge suppression method
Technical Field
The invention relates to the field of power electronics, in particular to a method for restraining starting surge of a PFC power supply module.
Background
In the prior art, a main power circuit of a PFC (power factor correction) power module mostly adopts a diode as a rectifying device (D1, D2, D3, D4) of a rectifying bridge, and simultaneously, a surge suppression resistor R1 and a surge switch Q3 are also used in the power supply to realize a surge protection function, as shown in fig. 1. When the circuit of the PFC power supply module is started, alternating-current voltage at an input end charges an output large capacitor C1 through a diode rectifier bridge (D1, D2, D3, D4) and a bypass diode D5, a surge switch Q3 is in a disconnected state in the starting-up process, and a surge suppression resistor R1 and the output large capacitor are connected in series to achieve the purpose of current limiting; after the surge suppression is completed, the microcontroller (the control unit may also be a hardware circuit formed by separate elements and implementing the same function) as the control unit outputs a control signal, closes the surge switch Q3, and shields the surge suppression resistor R1 from short circuit, thereby entering a loop control stage (i.e., a normal power supply operating state). However, in the actual use process of the prior art, the surge switch Q3 is very easy to break down due to a high-voltage on-off condition; in addition, the surge switch Q3 is generally implemented by a MOS transistor, and its parasitic resistance and parasitic capacitance will affect the performance of the PFC circuit to a certain extent, resulting in severe current distortion and reduced power factor. In addition, in the above scheme, if an overcurrent or output short circuit fault occurs, due to the adoption of diode rectification, the rectification part still outputs direct-current voltage, so that alternating-current input voltage cannot be cut off, and the over-temperature generated by short circuit directly causes the inductance enameled wire to melt, so that turn-to-turn short circuit is caused, and the module power supply is damaged.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for starting the surge suppression of a PFC power supply module with small waveform distortion without using a surge switch aiming at the defects that the surge switch in the prior art is easy to damage and the waveform distortion is serious.
The technical scheme adopted by the invention for solving the technical problems is as follows: a starting surge suppression method of a PFC power supply module is constructed, and the method comprises the following steps:
a) Making the auxiliary power supply work, and selecting or obtaining a first set value;
b) Continuously collecting voltage values of output voltage and input voltage;
c) After the input voltage is judged to reach the peak value, comparing whether the difference value of the current input voltage and the output voltage is larger than the first set value, if so, executing the next step, and if not, returning to the step B);
d) Outputting a control signal, controlling a rectifying device of the power supply module to be connected into a rectifying circuit, and charging a first capacitor;
e) And if the current input voltage is smaller than the difference between the current output voltage and the first set value, if so, disconnecting the rectifying device and returning to the step C), and if not, returning to the step D).
Further, after the step E), the following steps are also included:
f) Judging whether the difference between the current input voltage value and the output voltage is smaller than the first set value, if so, opening the rectifier all the time to enable the PFC power supply module to enter a normal working mode; if not, returning to the step C) to continue the input surge suppression.
Still further, the method comprises the following steps:
the controller is used for monitoring the output voltage and the output current, and when the load is short-circuited or the output current exceeds a set threshold value, the control signal is switched off, so that the rectifying device stops working in the next alternating current period of the input voltage, and the input alternating current voltage is switched off.
Furthermore, in the step a), the first capacitor is charged through a pre-charging circuit, so that the auxiliary power supply starts to operate; the pre-charging circuit is directly connected to one end of the first capacitor through the alternating current input end.
Furthermore, the pre-charging circuit obtains voltage from the alternating current input end through the diode, converts the input voltage from the alternating current voltage into direct current voltage and carries out small-current constant-current charging on the first capacitor.
Furthermore, the step C) determines whether the input voltage reaches a peak value by comparing the currently collected input voltage value with the set peak voltage value.
Further, in the step D), the first capacitor is charged through a bypass diode; the bypass diode is connected to one end of the first capacitor through the output end of the rectifying circuit.
Furthermore, converting the input alternating voltage into direct voltage through an isolated voltage sensor, and acquiring the voltage value of the input voltage; the output voltage value is obtained by dividing the output voltage at the output terminal.
Still further, the rectifying device includes a thyristor, and the control signal includes a control signal connected to a gate of the thyristor.
Furthermore, the rectifier devices are connected to form a full-bridge topology, so that the input alternating current signal is converted into a direct current signal, and a thyristor and a rectifier diode are respectively arranged on two bridge arms of the full-bridge topology.
The implementation of the method for inhibiting the starting surge of the PFC power supply module has the following beneficial effects: the pre-charging circuit is used for charging the first capacitor when the PFC power supply module is started, so that the auxiliary power supply can provide a running power supply for the control unit, the control unit runs to detect input and output voltages and output control signals, the control unit can control the rectifying device according to the detected parameter characteristics of the input and output voltages, the connection or disconnection of the rectifying device is realized, and the PFC power supply module can avoid or inhibit starting surge when in working. Therefore, surge suppression can be performed without using a surge switch, and waveform distortion is small.
Drawings
Fig. 1 is a schematic structural diagram of a PFC power module in the prior art;
fig. 2 is a flowchart of a start-up surge suppression method in an embodiment of the start-up surge suppression method of the PFC power module of the present invention;
fig. 3 is a schematic structural diagram of the PFC power module in the embodiment;
FIG. 4 is a circuit diagram of the first branch circuit in the embodiment;
fig. 5 is a schematic diagram of the ac input and the output waveform of the input rectification in the embodiment.
Detailed Description
The embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in fig. 2, in an embodiment of the method for suppressing start-up surge of the PFC power supply module according to the present invention, a method for suppressing start-up surge of the PFC power supply module includes the following steps:
step S11, the auxiliary power supply starts to operate, and the first setting value is selected: in this step, the PFC power module is powered on, the auxiliary power supply starts to operate to provide power to the control unit, and when the control unit starts to operate, the first setting value is selected or called. In this embodiment, the first setting value is a constant set in advance, and in this embodiment, the first setting value is stored in the control unit and called out from the storage location of the control unit when the control unit is powered on and starts operating. In the present embodiment, the first set value is a set value representing a difference between the collected input voltage and the output voltage that does not cause an excessive inrush current to occur. The value range of the first set value is generally selected from 0 to 5, because if the first set value is larger, the impulse current is large because the input voltage minus the output voltage is divided by the impedance on the loop (mainly comprising the voltage drop of a power grid and a thyristor, the voltage drop of a bypass diode, the impedance of the loop and the like), and thus the impulse current of each power frequency cycle is large in the starting process, and the inhibition on the impulse current cannot be realized.
It is worth mentioning that, although the control unit is also used in the prior art, the control signal output by the control unit is completely different from that in the present embodiment in the prior art because the surge switch is present and the controlled rectifying unit is not used (the rectifying diode is directly used). For example, in the prior art, a control signal of the surge switch needs to be output to be turned off, so that the capacitor can be charged through the current limiting resistor R1 (see fig. 1); then, the surge switch needs to be turned on to transmit the converted input voltage to the output terminal of the power module. In the present embodiment, the surge switch is not present in the conversion transmission path of the input voltage, and the control unit is not required to output the corresponding control signal. In contrast, in the present embodiment, the surge is eliminated and suppressed by the control of the rectifying device. In other words, although the method in the present embodiment can suppress the input surge to some extent as compared with the method in the related art, the suppression method and the circuit configuration used by the both are completely different.
Step S12 the control unit continuously obtains the collected input voltage value and output voltage value: in this step, the input voltage value and the output voltage value are obtained by sampling the input voltage and the output voltage, and these sampled values are transmitted to the control unit. In this embodiment, the sampling is performed continuously. It should be noted that, in the present embodiment, the input voltage is an ac voltage, and therefore, an isolated voltage sensor is adopted to convert the input ac voltage into a dc voltage and obtain the input voltage value. For example, the input voltage value may be obtained by using a hall voltage sensor. For the output voltage value, the output voltage value is direct current voltage, and the output voltage value can be obtained through simple voltage division and sampling.
Step S13, if the input voltage reaches the peak value, executing the next step; otherwise, returning to the previous step. In this embodiment, since the sampling is continuously performed, that is, the sampling of step S12 is continuously performed regardless of whether the input voltage reaches the peak value, in this step, it is actually continuously determined whether the input voltage reaches the peak value, and if so, the next step is performed. In this embodiment, whether the input voltage reaches the peak value is determined by comparing the input voltage with a set effective value of the peak voltage, and if the sampled input voltage value reaches the set effective value of the peak voltage, the input voltage is considered to reach the peak value.
And step S14, if the difference value between the current input voltage and the current output voltage is larger than the first set value, executing the next step, otherwise, returning to the step S12. In this step, the currently obtained input voltage value and the output voltage value are subtracted, and whether the obtained difference value is greater than a first set value or not is determined. In fact, this step is to determine whether the input voltage is higher than the output voltage by a set value, and once this condition is met, the next step is executed, otherwise, the step returns to step S12.
Step S15 outputs a control signal to cause the rectifier device to be connected: in this step, the control unit outputs a control signal to enable the rectifying device to be connected to a voltage conversion channel (or to be connected to a rectifying circuit) of the PFC power supply module, that is, to enable the rectifying device to achieve a function of rectifying the input ac voltage. When the rectifying device begins to output the rectified DC level along with the input AC voltage, the DC level charges the first capacitor through the bypass diode.
Step S16, if the current input voltage is smaller than the difference value between the current output voltage and the first set value, if so, returning to the step S15, and continuing to maintain the control signal to enable the rectifying device to continue to rectify; if not, the output of the control signal is stopped, so that the voltage conversion on-off between the rectifying device and the PFC power supply module is disconnected, namely the rectifying device cannot realize the rectifying function, and the step returns to the step S12. In fact, in this step, it is also determined whether the condition for turning on the thyristor exists, if so, the thyristor is continuously controlled, otherwise, the thyristor is turned off.
It should be noted that, in the present embodiment, after the step S16 is executed, the following steps are further included: judging whether the difference between the current input voltage value and the output voltage is smaller than the first set value, if so, opening the rectifier all the time to enable the PFC power supply module to enter a normal working mode; if not, the process returns to step S13 to continue the input surge suppression. In this embodiment, the above-mentioned step of determining is the key to whether the PFC power module stays in the surge suppression mode or enters the normal operating mode, and if the step returns to step S13 after executing this step, the PFC power module still stays in the surge suppression mode; when the PFC power supply module enters the normal operating mode, the control unit needs to maintain the connection of the rectifier device (realized by maintaining the control signal), and also needs to operate the power switching device of the PFC power supply module to perform switching conversion on the rectified output voltage. In other words, before the step S13 is executed and the operating mode is entered, the power switch device (for example, the MOS transistor Q1 in fig. 3) of the PFC power module in the present embodiment may be inactive, and the control unit thereof may not output the driving waveform or the control signal of the power switch device. In general, what is called an input surge is nothing but the impact of the input voltage on the devices on the voltage conversion channel of the power supply, i.e. there is a certain voltage difference between the two, so that the devices receive the impact of voltage or current. Under the condition that the input voltage and the output voltage are not different, the impact basically does not exist or does not influence a device or a subsequent device, so that when the real-time voltage difference between the input voltage and the output voltage is reduced to a certain degree, the PFC power supply module can be converted into a normal working mode from a surge suppression mode.
In addition, in this embodiment, after the PFC power module enters the operating mode, the method may further include the following steps: the controller is used for monitoring the output voltage and the output current, and when the load is short-circuited or the output current exceeds a set threshold value, the control signal is switched off, so that the rectifying device stops working in the next alternating current period of the input voltage, and the input alternating current voltage is switched off.
In one case of this embodiment, when the control signal is at a high level, the rectifier device is connected to a voltage conversion channel of the PFC power module, so as to implement a rectification function; when the control signal is at a low level, the rectifier module does not work, which is equivalent to disconnection from the voltage conversion channel.
Fig. 3 shows a schematic structural diagram of the PFC power supply in one case of the present embodiment. In fig. 3, the PFC power supply module includes a controlled input rectification unit 1, an auxiliary power supply 2, a control unit 3, an input voltage acquisition circuit 4, an output voltage acquisition circuit 5, a first capacitor C1, and a pre-charging branch 6; the control unit 3 outputs a rectification control signal when the PFC power supply module is started, so that the PFC power supply module enters a surge suppression mode, the controlled input rectification unit 1 rectifies and cuts off the AC input and does not output DC voltage, and meanwhile, a switch control signal is not output, so that a switch device of the PFC power supply module does not work; that is, when the PFC power supply module is powered up to start operating, there is an input surge voltage or current in most cases. In order to avoid or suppress such a surge, in the present embodiment, by using the controlled input rectifying unit 1 and by using the control unit 3, the controlled input rectifying unit 1 does not operate, that is, the controlled input rectifying unit 1 is disconnected from the conversion channel of the entire PFC power module, so that it does not output the rectified voltage, and at the same time, the control unit 3 does not output the switching control signal, so that the main switching device of the PFC power module also does not operate, that is, the entire PFC power module enters the surge suppression mode, so that the impact of the surge voltage or current on the PFC power module is minimized, thereby achieving the suppression of the input surge. In this case, the PFC power supply module has no voltage output, but in order to maintain the control of the controlled input rectifying unit 1 and the switching device (for example, to maintain an off state and start operating it at an appropriate time), the operation of the control unit 3 must be maintained, and thus, in the present embodiment, the pre-charging branch 6 and the auxiliary power supply 2 are provided, and in the surge suppression mode, the auxiliary power supply 2 supplies power to the control unit, and the normal operation of the control unit 3 is maintained. In this embodiment, the pre-charging branch 6 obtains a voltage from the ac input terminal or the output terminal of the controlled rectifying unit 1 and charges the first capacitor C1, so that a certain voltage exists on the first capacitor C1; since the first capacitor C1 is connected in parallel to the output terminal of the PFC power supply module, and has one end connected to the input terminal of the auxiliary power supply 2 and the other end grounded or equipotential, it is possible to provide a supply voltage to the auxiliary power supply 2 when the PFC power supply module is in the surge suppression mode; the input voltage acquisition circuit 4 and the output voltage acquisition circuit 5 respectively acquire the input voltage and the output voltage of the PFC power module and transmit the input voltage and the output voltage to the control unit 3, and the control unit 3 respectively outputs a rectification control signal or a switch control signal according to the acquired input voltage and output voltage to control the controlled input rectification unit 1 and a switch device (a MOS transistor Q1 in fig. 3) of the PFC power module, so that the PFC power module stays in the surge suppression mode or enters the working mode.
In order to ensure power supply to the control unit 3 during and after power-on for a period of time, the pre-charging branch 6 includes a first branch and a second branch, one end of the first branch is connected to the ac input end of the PFC power module, and the other end of the first branch is connected to the positive output end of the PFC power module; that is, the first branch circuit directly obtains the voltage from the ac input terminal and does not charge the first capacitor C1; one end of the second branch is connected to the output end of the controlled rectifying unit 1, and the other end of the second branch is connected to the positive output end of the PFC power supply module; that is, the second branch is used for charging the first capacitor C1 when the controlled input rectifying unit 1 has a rectified output and the entire PFC power module does not have a dc output yet.
Specifically, in the present embodiment, as shown in fig. 4, the first branch forms a rectifying circuit through two low current diodes D7, D8 and power rectifying diodes D3, D4 (D3 and D4 in fig. 4 are D3 and D4 in fig. 3), and takes power from the ac input. The reference ground of the first branch circuit is a positive output end of the main circuit and is a suspension end. After power-on, the starting chip generates power supply to supply power to the operational amplifier, so that the first branch circuit charges the large capacitor at the output end according to the set constant current and small current, and a power-on process is established. If the output of the main circuit is short-circuited or works normally, the voltage of the output end is higher than the rectified voltage, the starting chip cannot generate power supply voltage for the operational amplifier, and the charging MOS tube Q3 is in a cut-off state. The starting chip is an integrated circuit that can use a wide range of voltage as an input voltage and supply a set voltage to power devices such as a controller before the main power supply starts to operate, for example, SCM 9601A; the second branch circuit comprises a bypass diode D5, an anode of the bypass diode D5 is connected to the output end of the controlled rectifying unit 1, and a cathode of the bypass diode D5 is connected to the positive output end of the PFC power module, that is, to one end of the first capacitor C1, when the controlled rectifying unit 1 has a rectified output, the voltage of the rectified output charges the first capacitor C1 through the bypass diode D5; when the controlled rectifying unit 1 does not have a rectified output, the voltage may be directly obtained from the ac input terminal through the first branch line to charge the first capacitor C1.
In this embodiment, the controlled rectifying unit 1 includes a bridge rectifier circuit formed by thyristors, control electrodes of the thyristors are connected to a signal output end of the control unit 3, that is, a thyristor control signal output end, and the thyristors are controlled by the control signal output by the control unit 3 whether to be connected to the bridge rectifier circuit to participate in rectification. Referring to fig. 3, in this embodiment, the upper tubes of the two bridge arms of the bridge rectifier circuit are thyristors, the lower tubes of the two bridge arms are diodes, cathodes of the two thyristors are connected to the positive output terminal of the bridge rectifier circuit, and anodes of the two thyristors are respectively connected to cathodes of the diodes on the bridge arms where the thyristors are located and are respectively connected to the two ac input terminals. In fig. 2, the thyristor T1 and the diode D3 constitute one arm, the thyristor T2 and the diode D4 constitute the other arm, and the input ac voltages are respectively input from the connection points of the two devices of the two arms. In one bridge arm, the device connected to the output of the rectifier is the upper tube and the device connected to ground potential or equipotential is the lower tube. For example, in one arm, thyristor T1 is the upper tube and diode D3 is the lower tube. In fig. 3, when the level of the control electrode of the row thyristor is low, the thyristor does not operate, and regardless of the state of the voltage applied to the two ends of the thyristor, the two ends of the thyristor both present a high-impedance state, which is equivalent to being disconnected from the circuit. The thyristor exhibits the diode characteristic only when the control signal of the thyristor is high. That is, the controlled input rectifying unit 1 is turned on when a forward voltage is applied and turned off when a reverse voltage is applied, that is, the thyristor participates in input rectification as a unidirectional conducting element only when the gate level of the thyristor is a high signal, and the controlled input rectifying unit is output from the rectified voltage. It should be noted that in this embodiment, the input is an ac voltage, so that the voltage on the gate of the thyristor needs to be kept high in each ac cycle, and the thyristor will participate in input rectification as a unidirectional conducting element in this cycle.
In addition, in this embodiment, the control electrodes of the two thyristors are controlled by the same thyristor control signal output by the control unit. That is, the control signals for the two thyristors in fig. 3 are the same signal, so for the two thyristors in fig. 3, the input rectification is synchronously engaged or exited.
In this embodiment, the output voltage acquisition circuit includes a voltage dividing module, the voltage dividing module includes two resistors connected in series and then connected in parallel to the output terminal of the PFC power supply module, and the control unit obtains the sampling value of the output voltage from the connection point of the two resistors. In the present embodiment, the sampling value of the output voltage is directly transmitted to the control unit 3, and since the voltage dividing ratio (i.e., the ratio between the two voltage dividing resistors) of the voltage dividing module is determined, in the case of direct input, the control unit 3 can restore the output voltage value by expanding the input sampling value by the value corresponding to the voltage dividing ratio. In this embodiment, the input voltage acquisition circuit comprises
The switching device of the PFC power supply module includes an MOS transistor Q1, a gate of the MOS transistor Q1 is electrically connected to a switching signal output end of the control unit 3, a source of the MOS transistor Q1 is at ground potential or equipotential (i.e., a node labeled-Vo in fig. 3), and a drain of the MOS transistor Q1 is connected to an output positive terminal of the bridge rectifier through an inductor L1, and is connected to an output end of the PFC power supply module (i.e., a node labeled + Vo in fig. 3) through a rectifying diode D6.
Fig. 5 shows the correspondence of the input waveform and the rectified output waveform in this embodiment, which can be clearly seen. In fig. 5, the voltage value in the waveform of the rectified output gradually increases with time, that is, specifically, for the ac input, the rectified input corresponding to each ac cycle gradually increases with time, and this input rectification is controlled by controlling the connection time of the controlled input rectification unit in one ac cycle. In the embodiment, the on-off of the thyristor only occurs from the peak value of the alternating current to the overcurrent time, namely, the interval from 90 degrees to 180 degrees and the interval from 270 degrees to 360 degrees in one period, and each power frequency period is only turned on once, so that the surge voltage or current at the moment of starting the computer is well inhibited by the control.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A starting surge suppression method for a PFC power supply module is characterized by comprising the following steps:
a) Making the auxiliary power supply work, and selecting or obtaining a first set value;
b) Continuously collecting voltage values of output voltage and input voltage;
c) After the input voltage is judged to reach the peak value, comparing whether the difference value of the current input voltage and the output voltage is larger than the first set value, if so, executing the next step, and if not, returning to the step B);
d) Outputting a control signal to control a rectifier device of the power supply module to be connected into a rectifier circuit and charge a first capacitor;
e) And if the current input voltage is smaller than the difference between the current output voltage and the first set value, if so, disconnecting the rectifying device and returning to the step C), and if not, returning to the step D).
2. The method for starting up surge suppression for a PFC power supply module according to claim 1, further comprising the following steps after performing step E):
f) Judging whether the difference between the current input voltage value and the output voltage is smaller than the first set value, if so, opening the rectifier all the time to enable the PFC power supply module to enter a normal working mode; if not, returning to the step C) to continue the input surge suppression.
3. The method for starting surge suppression for a PFC power supply module according to claim 2, further comprising the steps of:
the controller is used for monitoring the output voltage and the output current, and when the load is short-circuited or the output current exceeds a set threshold value, the control signal is switched off, so that the rectifying device stops working in the next alternating current period of the input voltage, and the input alternating current voltage is switched off.
4. The method for starting surge suppression by a PFC power supply module according to claim 3, wherein in the step A), the first capacitor is charged by a pre-charging circuit, so that the auxiliary power supply starts to operate; the pre-charging circuit is directly connected to one end of the first capacitor through an alternating current input end.
5. The method of claim 4, wherein the pre-charge circuit obtains voltage from the AC input terminal through a diode, converts the input voltage from AC to DC, and performs low current constant current charging on the first capacitor.
6. The method for suppressing startup surge of a PFC power supply module according to claim 3, wherein in the step C), whether the input voltage reaches a peak value is determined by comparing a currently collected input voltage value with a set peak voltage value.
7. The method for suppressing startup surge of a PFC power supply module according to claim 3, wherein in the step D), the first capacitor is charged through a bypass diode; the bypass diode is connected to one end of the first capacitor through the output end of the rectifying circuit.
8. The method for suppressing startup surge of a PFC power supply module according to any one of claims 1-7, wherein an input AC voltage is converted into a DC voltage by an isolated voltage sensor, and a voltage value of the input voltage is obtained; the output voltage value is obtained by dividing the output voltage at the output terminal.
9. The method of any of claims 1-7, wherein the rectifying device comprises a thyristor, and the control signal comprises a control signal coupled to a gate of the thyristor.
10. The method according to claim 9, wherein the rectifying device is connected in a full-bridge topology such that an input ac signal is converted into a dc signal, and a thyristor and a rectifying diode are respectively disposed on two arms of the full-bridge topology.
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