CN114977113A - AC-DC converter control method and device - Google Patents

Abstract

The present application discloses an AC-DC converter control method and device, wherein the method includes outputting a first DC voltage after rectifying according to a first preset mode, and outputting a second DC voltage after performing rectification according to a second preset mode , wherein the first DC voltage is not greater than the second DC voltage, the first preset mode and the second preset mode are the same or different modes; the temperature parameter value during the discharge process of the capacitor is detected; when the detection In the event of an abnormality, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor. The circuit abnormality problem is solved by this application.

Description

AC-DC converter control method and device

technical field

The present application relates to the field of AC-DC converters, and in particular, to an AC-DC converter control method and device.

Background technique

An AC-DC converter refers to a component that converts an AC voltage into a DC voltage. AC-DC converters can be used in communication, network, railway signal, railway locomotive, finance, military, LED display, electric power, industrial control and other systems and fields.

The AC-DC converter includes a transformer method and a switching method. The transformer method first needs to step down the AC voltage to an appropriate AC voltage through a transformer. This is an AC/AC conversion, and the step-down value is set by the winding ratio of the transformer. Next, the AC voltage stepped down by the transformer is full-wave rectified by a diode bridge rectifier and converted into a pulse voltage. Finally, the capacitor smoothes and outputs a DC voltage with a small ripple, which is the most traditional AC/DC conversion method. The switching method is a method in which a control circuit is used to control the switching element to obtain a stable and expected DC output. Compared with the transformer method, the switching method is composed of switching elements and control circuits, and the circuit structure is more complicated. However, since a small transformer can be used based on high-frequency control, it contributes to the miniaturization of the equipment, which is a great advantage of it.

For the problem of abnormal circuit temperature in the related art, no effective solution has been proposed yet.

SUMMARY OF THE INVENTION

The main purpose of the present application is to provide an AC-DC converter control method and device to solve the problem of abnormal circuit temperature.

In order to achieve the above object, according to an aspect of the present application, there is provided a control method for an AC-DC converter, comprising: outputting a first DC voltage after performing rectification according to a first preset mode and outputting a first DC voltage after performing rectification according to a second preset mode outputting a second DC voltage, wherein the first DC voltage is not greater than the second DC voltage, the first preset mode and the second preset mode are the same or different modes; detecting the temperature during the discharge process of the capacitor parameter value; when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor.

Further, the AC-DC converter includes a modular high-frequency switching power supply, and further includes: when the modular high-frequency switching power supply is a high load driven by a high frequency, using PWM control with a constant period; The modular high-frequency switching power supply uses the PFM control of periodic variation when the current is less used and the load is low; wherein, the PWM is used as a control method in which the frequency is constant and the output part is fetched from the input voltage through the switch , the PFM is used to fetch the output part by fixing the opening time and changing the frequency.

Further, the outputting the first DC voltage after rectifying according to the first preset mode includes: converting the negative voltage component of the input voltage into a positive voltage through a diode bridge circuit structure according to the first preset mode and then rectifying it into a DC voltage ; the outputting the second DC voltage after performing rectification according to the second preset mode includes: using a diode to eliminate the input negative voltage component according to the second preset mode and then rectifying it into a DC voltage; the capacitor of the second preset mode The capacity and load are different from the first preset mode capacitor capacity and load.

Further, when the abnormality is detected, the switching element is controlled to be disconnected, wherein the switching element is used to connect the transformer and the capacitor, and further comprises: the output voltage isolation proportional signal circuit and the transformer or the output freewheeling inductor use the same magnetic circuit; The voltage ratio of each winding on the road is the same as the turns ratio of each winding. The output voltage of the output voltage isolation proportional signal circuit is proportional to the voltage output by the secondary power circuit. The current voltage can be used as the output voltage isolation proportional signal to transmit Give the output overvoltage signal circuit connected to the output voltage isolation proportional signal circuit; when the output voltage isolation proportional signal reaches a predetermined value, the output overvoltage signal circuit outputs the overvoltage protection signal, and transmits the overvoltage protection signal to the switching element control switch Power off.

Further, when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor, and further includes: the signal delay control circuit can control the switching element control end through the level signal input by the output voltage sampling circuit. Breaking, thereby controlling the opening and closing of the response terminal of the controllable switching device, and controlling the connection between the current sharing circuit of the switching element power supply and the current sharing bus, wherein a current sharing control circuit is added to the power supply of each switching element, and the response of the switching element is changed. The terminal is connected to the current sharing circuit of the switching element power supply, and at the same time, the output voltage of the switching power supply after power-on is used as the input signal of the current sharing control circuit. The control terminal of the controllable switching device is powered off, and the response terminal of the controllable switching device is turned off, so that the current sharing circuit of the switching element power supply is disconnected from the current sharing bus; when the output voltage of the switching element power supply is established and stabilized Then, the control terminal of the switching element in the current sharing control circuit of the switching element power supply is powered on, and the response terminal of the switching element is controlled to be in a connected state, so that the current sharing circuit of the switching element power supply is connected to the current sharing bus.

Further, the detecting the temperature parameter value during the discharge process of the capacitor includes: detecting whether the temperature parameter value during the discharge process of the capacitor exceeds the rated temperature; when the abnormality is detected, controlling the switching element to be disconnected, wherein the switching element is used for connecting The transformer and the capacitor include: when it is detected that the temperature parameter value exceeds the rated temperature, it is judged as abnormal, and the switching element between the transformer and the capacitor is controlled to be disconnected.

Further, the outputting the first DC voltage after performing rectification according to the first preset mode and outputting the second DC voltage after performing rectification according to the second preset mode includes: confirming the actual output of the first DC or the second DC voltage. Two direct current DC voltage values, and control the switching element according to the voltage information, so as to ensure stable realization of the specified first direct current DC or second direct current DC voltage output.

In order to achieve the above object, according to another aspect of the present application, a computer-readable storage medium is provided, where a computer program is stored in the computer-readable storage medium, wherein the computer program is configured to execute the method.

In order to achieve the above object, according to yet another aspect of the present application, an electronic device is provided, comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the computer program. method described.

In the AC-DC converter control method and device in the embodiments of the present application, the first DC voltage is output after rectification according to the first preset mode, and the second DC voltage is output after rectification according to the second preset mode, and then the discharge of the capacitor is detected. The temperature parameter value in the process; when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor. The fault abnormality detection and related control are realized by the method in the present application.

Description of drawings

The accompanying drawings, which constitute a part of this application, are used to provide a further understanding of the application and make other features, objects and advantages of the application more apparent. The accompanying drawings and descriptions of the exemplary embodiments of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic flowchart of an AC-DC converter control method according to an embodiment of the present application;

2 is a schematic structural diagram of an AC-DC converter control device according to an embodiment of the present application;

FIG. 3 is a schematic flowchart of an AC-DC converter control method according to an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances for the embodiments of the application described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", The orientation or positional relationship indicated by "vertical", "horizontal", "horizontal", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are primarily used to better describe the present application and its embodiments, and are not intended to limit the fact that the indicated device, element, or component must have a particular orientation, or be constructed and operated in a particular orientation.

In addition, some of the above-mentioned terms may be used to express other meanings besides orientation or positional relationship. For example, the term "on" may also be used to express a certain attachment or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific situations.

Furthermore, the terms "installed", "set up", "provided with", "connected", "connected", "socketed" should be construed broadly. For example, it may be a fixed connection, a detachable connection, or a unitary structure; it may be a mechanical connection, or an electrical connection; it may be directly connected, or indirectly connected through an intermediary, or between two devices, elements, or components. internal communication. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

As shown in FIG. 1 , the control method in the embodiment of the present application includes the following steps:

Step S101, outputting a first DC voltage after performing rectification according to a first preset mode and outputting a second DC voltage after performing rectification according to a second preset mode, wherein the first DC voltage is not greater than the second DC voltage, so The first preset mode and the second preset mode are the same or different modes.

The first DC voltage is output after rectification according to the first preset mode, and the second DC voltage is output after rectification according to the second preset mode.

There are three stages of power conversion: Input Rectification: This process takes the AC supply voltage and converts it into a DC rectified wave using a diode bridge. Add a capacitor to the output of the bridge to reduce the ripple voltage. Power Factor Correction (PFC): The harmonic content of the current is considerable due to the non-linear current in the rectifier. There are two ways to solve this problem. The first is passive PFC, which uses filters to suppress the effects of harmonics, but is not very efficient. The second option, called active PFC, uses a switching boost converter to make the current waveform follow the shape of the input voltage. Active power factor correction (PFC) is the only way to design power converters that meet current size and efficiency standards. Isolation: Switching power supplies can be isolated or not. When the input and output of the power supply are not physically connected, the device needs to be isolated. Isolation is done by using a transformer, which electrically isolates the two parts of the circuit. However, a transformer can only transmit power when the current changes, so the rectified DC voltage is converted into a high-frequency square wave, which is then transmitted to the secondary circuit, where it is rectified again, and finally transmitted to the output.

It should be noted that the first DC voltage is not greater than the second DC voltage, and the first preset mode and the second preset mode are the same or different modes. That is, there may be two identical preset modes or different preset modes.

Step S102, detecting the temperature parameter value during the discharge process of the capacitor.

The first DC voltage is output after rectification according to the first preset mode, and the second DC voltage is output after rectification according to the second preset mode.

Step S103, when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used for connecting the transformer and the capacitor.

When an abnormality is detected, the switching element for connecting the transformer and the capacitor is controlled to be turned off.

That is to say, under abnormal conditions, the connection with the transformer or the connection with the capacitor will be disconnected.

As a preference in this embodiment, the AC-DC converter includes a modular high-frequency switching power supply, and further includes: in the case that the modular high-frequency switching power supply is a high-frequency driven high load, using a constant cycle PWM control; PFM control with periodic variation is used when the modular high frequency switching power supply is a low load with less current usage; wherein the PWM is used as a constant frequency and is fetched from the input voltage through the switch The control method of the output part, the PFM is used to call the output part by fixing the opening time and changing the frequency.

In specific implementation, when the modular high-frequency switching power supply is a high-load high-frequency drive, a PWM control with a constant period is used, and at the same time, when the modular high-frequency switching power supply is a low-load power supply that uses less current In this case, use cycle-changing PFM control.

It should be noted that the PWM is used as a control method in which the frequency is constant and the output portion is retrieved from the input voltage through switches, and the PFM is used as a method in which the output portion is retrieved by changing the frequency by fixing the ON time.

As a preference in this embodiment, the outputting the first DC voltage after rectifying according to the first preset mode includes: converting the negative voltage component of the input voltage into a positive voltage through a diode bridge circuit structure according to the first preset mode After rectifying into a DC voltage; the outputting a second DC voltage after the rectification according to the second preset mode includes: using a diode to eliminate the input negative voltage component according to the second preset mode and then rectifying it into a DC voltage; the second The capacitor capacity and load of the preset mode are different from the capacitor capacity and load of the first preset mode.

During specific implementation, according to the first preset mode, the negative voltage component of the input voltage is converted into a positive voltage through a diode bridge circuit structure and then rectified into a DC voltage, and according to the second preset mode, a diode is used to eliminate the input negative voltage component and then rectified is the DC voltage. For different preset modes, different DC voltages can be obtained, mainly for different scenarios and working conditions, which can be applied to different scenarios or adjusted in different scenarios.

As a preference in this embodiment, when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor, and further includes: the output voltage isolation proportional signal circuit and the transformer or the output freewheeling inductor use the same magnetic The voltage ratio of each winding on the same magnetic circuit is the same as the turns ratio of each winding, the output voltage of the output voltage isolation proportional signal circuit is proportional to the voltage output by the secondary power circuit, and the current voltage can be used as the output voltage The isolated proportional signal is transmitted to the output overvoltage signal circuit connected to the output voltage isolated proportional signal circuit; when the output voltage isolated proportional signal reaches a predetermined value, the output overvoltage signal circuit outputs the overvoltage protection signal and transmits the overvoltage protection signal Give the switching element to control the switching power off.

In specific implementation, according to the principle that the voltage of each winding on the same magnetic circuit is proportional to the number of turns, the output voltage isolation proportional signal is generated from the isolated winding on the magnetic circuit through which the output current passes, as an output overvoltage protection signal. The use of optocoupler isolators in the output overvoltage protection circuit is omitted, and the power density is improved. The magnetic circuit here refers to the magnetic circuit in the transformer or output freewheeling inductor. This isolation winding ratio signal is not specially set up for overvoltage protection, but it is combined with the primary input voltage of the power supply.

The output voltage isolation proportional signal circuit uses the same magnetic circuit as the transformer or output freewheeling inductor. Since the voltage ratio of each winding on the same magnetic circuit is the same as the turns ratio of each winding, the output voltage of the output voltage isolation proportional signal circuit is different from the secondary power. The output voltage of the circuit is proportional, and this voltage can be used as the output voltage isolation proportional signal, which is transmitted to the output overvoltage signal circuit connected to the output voltage isolation proportional signal circuit. When the output voltage isolation proportional signal reaches a predetermined value, the output overvoltage signal is output. The voltage signal circuit outputs an overvoltage protection signal, and transmits the overvoltage protection signal to the switching device to control the switching power supply to be turned off.

As a preference in this embodiment, when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor, and further includes: the signal delay control circuit can output the level signal input by the voltage sampling circuit Control the opening and closing of the control terminal of the switching element, thereby controlling the opening and closing of the response terminal of the controllable switching device, and controlling the connection between the current sharing circuit of the switching element power supply and the current sharing bus, wherein a current sharing control circuit is added to each switching element power supply, and The response end of the switching element is connected to the current sharing circuit of the switching element power supply, and the output voltage of the switching power supply after power-on is used as the input signal of the current sharing control circuit. At the moment when the switching element power supply is powered on, the current sharing of the switching element power supply The control terminal of the controllable switching device in the control circuit is powered off, and the response terminal of the controllable switching device is turned off, so that the current sharing circuit of the switching element power supply is disconnected from the current sharing bus; After the output voltage is established and stabilized, the control terminal of the switching element in the current sharing control circuit of the switching element power supply is powered on, and the response terminal of the control switching element is in a connected state, so that the current sharing circuit of the switching element power supply is connected to the current sharing bus.

In the specific implementation, the input terminal of the voltage output sampling circuit is connected to the voltage output terminal of the switching power supply after power-on. When multiple power supplies operate in parallel, the instantaneous output voltage of the switching power supply after power-on is merged into the power supply system is zero, and after a period of time , the output voltage of the switching power supply after power-on tends to be stable, and the voltage output sampling circuit can collect the voltage change of the switching power supply after power-on, and transmit the collected voltage signal to the subsequent circuit. The signal delay control circuit and The upper-level circuit, that is, the output voltage sampling circuit is connected in series, and its input end is connected with a delay capacitor in parallel with the output voltage sampling circuit. When the switching power supply is connected to the power system after power-on, the instantaneous output voltage is zero, and the signal delay control circuit is at this time. The control terminal of the controllable switching device connected in series with its output terminal is in the off state, so the response terminal of the controllable switching device is in the off state, that is, between the current sharing circuit and the current sharing bus of the switching power supply after power-on In the disconnected state, the power-on switching power supply and the power-on first switching power supply are independent of each other. After the output voltage of the power-on switching power supply is stable, the output voltage sampling circuit transmits the voltage signal to the signal delay control circuit, and the signal delays. The time delay control circuit controls the control end of the controllable switching device connected to the output end of the signal delay control circuit through the delay capacitor connected to its input end. When the delay capacitor is charged, the signal delay control circuit The output terminal of the controllable switching device powers up the control terminal of the controllable switching device, and then the response terminal of the controllable switching device is turned on, and the current sharing circuit of the post-power-on switching power supply is connected to the current sharing bus, so that the post-power-on switching power supply is connected. It is connected with the current sharing bus of the first power supply power supply after the output voltage of the second power supply switching power supply is stably established.

By adding a current sharing control circuit to each post-power-on switching power supply, and connecting the response terminal of the controllable switching device to the current-sharing circuit of the post-power-on switching power supply, at the same time, the output voltage of the post-power-on switching power supply is used as The input signal of the current sharing control circuit, at the moment of power-on of the post-power-on switching power supply, the control terminal of the controllable switching device in the current sharing control circuit of the post-powering switching power supply is powered off, thereby controlling the response of the controllable switching device. The terminal is in the off state, so that the current sharing circuit of the post-power-on switching power supply is disconnected from the current-sharing bus. When the output voltage of the post-power-on switching power supply is established and stabilized, the current sharing control circuit of the post-power-on switching power supply The control terminal of the controllable switch type device is powered on, so that the response terminal of the controllable switch type device is controlled to be in a connected state, so that the current sharing circuit of the switching power supply after being powered on is connected to the current sharing bus.

As a preference in this embodiment, the detecting the temperature parameter value during the capacitor discharge process includes: detecting whether the temperature parameter value during the capacitor discharge process exceeds the rated temperature; when abnormality is detected, controlling the switch element to turn off, wherein the The switch element is used to connect the transformer and the capacitor, including: when the detected temperature parameter value exceeds the rated temperature, it is determined as abnormal, and the switch element between the transformer and the capacitor is controlled to be disconnected.

During specific implementation, it is detected whether the temperature parameter value during the discharge process of the capacitor exceeds the rated temperature, and if the detected abnormality is detected, the switching element between the control transformer and the capacitor is disconnected.

Preferably in this embodiment, the outputting the first DC voltage after performing rectification according to the first preset mode and outputting the second DC voltage after performing rectification according to the second preset mode includes: confirming the actual output of the first DC voltage Direct current DC or second direct current DC voltage value, and control the switching element according to the voltage information, so as to ensure stable realization of the specified first direct current DC or second direct current DC voltage output.

During specific implementation, in order to ensure the stable realization of the specified first DC or second DC voltage output, the first DC or second DC voltage value of the actual output is confirmed, and the switching element is adjusted according to the voltage information. Take control.

Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present application can be implemented by a general-purpose computing device, and they can be centralized on a single computing device, or distributed in a network composed of multiple computing devices Alternatively, they can be implemented with program codes executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or they can be integrated into The multiple modules or steps are fabricated into a single integrated circuit module. As such, the present application is not limited to any particular combination of hardware and software.

As shown in FIG. 2, another embodiment of the present application also provides an AC-DC converter control device, including:

The first conversion module 210 is configured to output the first DC voltage after rectifying according to the first preset mode;

The second conversion module 220 is configured to output a second DC voltage after rectifying according to a second preset mode, wherein the first DC voltage is not greater than the second DC voltage, and the first preset mode is the same as the first DC voltage. Two preset modes are the same or different modes;

It also includes: a temperature sensor 240 for detecting the temperature parameter value during the discharge process of the capacitor;

The control module 230 is configured to control the switching element to be turned off when an abnormality is detected, wherein the switching element is used to connect the transformer and the capacitor.

The first conversion module 210 and the second conversion module 220 output a first DC voltage after rectification according to a first preset mode, and output a second DC voltage after rectification according to a second preset mode.

In the control module 230, when an abnormality is detected, the switch element is controlled to be disconnected, wherein the switch element is used to connect the transformer and the capacitor.

That is to say, under abnormal conditions, the connection with the transformer or the connection with the capacitor will be disconnected.

The temperature sensor 240 outputs a first DC voltage after rectification according to a first preset mode, and outputs a second DC voltage after rectification according to a second preset mode.

Embodiments of the present application further provide a storage medium, where a computer program is stored in the storage medium, wherein the computer program is configured to execute the steps in any one of the above method embodiments when running.

Optionally, in this embodiment, the above-mentioned storage medium may be configured to store a computer program for executing the following steps:

S1, outputting a first DC voltage after performing rectification according to a first preset mode and outputting a second DC voltage after performing rectification according to a second preset mode, wherein the first DC voltage is not greater than the second DC voltage, and the the first preset mode and the second preset mode are the same or different modes;

S2, detect the temperature parameter value during the discharge process of the capacitor;

S3, when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor.

Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), Various media that can store computer programs, such as removable hard disks, magnetic disks, or optical disks.

Embodiments of the present application further provide an electronic device, including a memory and a processor, where a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

Optionally, the above-mentioned electronic device may further include a transmission device and an input-output device, wherein the transmission device is connected to the above-mentioned processor, and the input-output device is connected to the above-mentioned processor.

Optionally, in this embodiment, the above-mentioned processor may be configured to execute the following steps through a computer program:

S1, outputting a first DC voltage after performing rectification according to a first preset mode and outputting a second DC voltage after performing rectification according to a second preset mode, wherein the first DC voltage is not greater than the second DC voltage, and the the first preset mode and the second preset mode are the same or different modes;

S2, detect the temperature parameter value during the discharge process of the capacitor;

S3, when an abnormality is detected, the switching element is controlled to be turned off, wherein the switching element is used to connect the transformer and the capacitor.

Optionally, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementation manners, and details are not described herein again in this embodiment.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims (10)

1. An AC-DC converter control method, comprising:

the method comprises the steps of outputting a first direct current voltage after rectification according to a first preset mode and outputting a second direct current voltage after rectification according to a second preset mode, wherein the first direct current voltage is not greater than the second direct current voltage, and the first preset mode and the second preset mode are the same or different;

detecting a temperature parameter value in the discharging process of the capacitor;

and when the abnormity is detected, controlling the switching element to be switched off, wherein the switching element is used for connecting the transformer and the capacitor.

2. The method of claim 1, wherein the AC-DC converter comprises a modular high frequency switching power supply, further comprising:

under the condition that the modularized high-frequency switching power supply is a high load driven by high frequency, PWM control with constant period is used;

using a periodically varying PFM control when the modular high frequency switching power supply uses less low load for current;

the PWM is used as a control method in which a frequency is constant and an output portion is called from an input voltage by a switch, and the PFM is used as a method in which an output portion is called by fixing an on time and changing a frequency.

3. The method of claim 1, wherein:

the outputting of the first direct current voltage after the rectification according to the first preset mode includes:

converting a negative voltage component of an input voltage into a positive voltage through a diode bridge circuit structure according to a first preset mode, and then rectifying the positive voltage component into a direct-current voltage;

the outputting the second direct current voltage after the rectification according to the second preset mode includes:

according to a second preset mode, eliminating an input negative voltage component by using a diode and rectifying the negative voltage component into direct current voltage;

the capacitor capacity and load of the second predetermined pattern are different from the capacitor capacity and load of the first predetermined pattern.

4. The method of claim 1, wherein when an anomaly is detected, controlling a switching element to open, wherein the switching element is used to connect a transformer and a capacitor, further comprising:

the output voltage isolation proportion signal circuit and the transformer or the output follow current inductor use the same magnetic circuit;

the voltage proportion of each winding on the same magnetic circuit is the same as the turn ratio of each winding, the output voltage of the output voltage isolation proportion signal circuit is in proportion to the voltage output outwards by the secondary power circuit, and the current voltage can be used as an output voltage isolation proportion signal and is transmitted to an output overvoltage signal circuit connected with the output voltage isolation proportion signal circuit;

when the output voltage isolation proportion signal reaches a preset value, the output overvoltage signal circuit outputs an overvoltage protection signal and transmits the overvoltage protection signal to the switching element to control the switching power supply to be switched off.

5. The method of claim 1, wherein when an anomaly is detected, controlling a switching element to open, wherein the switching element is used to connect a transformer and a capacitor, further comprising:

the signal delay control circuit can control the on-off of the control end of the switch element through the level signal input by the output voltage sampling circuit, thereby controlling the on-off of the response end of the controllable switch device and controlling the communication between the current-sharing circuit of the switch element power supply and the current-sharing bus bar, wherein, the current-sharing control circuit is added on each switch element power supply, the response end of the switch element is connected into the current-sharing circuit of the switch element power supply, and the output voltage of the later power-on switch power supply is taken as the input signal of the current-sharing control circuit,

at the moment of electrifying the switching element power supply, the control end of a controllable switching device in a current-sharing control circuit of the switching element power supply is powered off, and the response end of the controllable switching device is controlled to be in a turn-off state, so that the current-sharing circuit of the switching element power supply is disconnected with a current-sharing bus;

when the output voltage of the switching element power supply is established and stabilized, the control end of the switching element in the current-sharing control circuit of the switching element power supply is electrified, and the response end of the switching element is controlled to be in a connected state, so that the current-sharing circuit of the switching element power supply is connected with the current-sharing bus.

6. The method of claim 1, wherein said detecting a temperature parameter value during the discharge of the capacitor comprises:

detecting whether a temperature parameter value in a capacitor discharging process exceeds a rated temperature or not;

when detecting an abnormality, controlling a switching element for connecting a transformer and a capacitor to be turned off, comprising:

and when the temperature parameter value exceeds the rated temperature, judging that the temperature parameter value is abnormal, and controlling a switching element between the transformer and the capacitor to be switched off.

7. The method of claim 1, wherein outputting the first dc voltage after the rectifying according to the first preset mode and outputting the second dc voltage after the rectifying according to the second preset mode comprises:

the first direct current DC or the second direct current DC voltage value which is actually output is confirmed, and the switching element is controlled according to the voltage information, so that the first direct current DC or the second direct current DC voltage output which is regulated is ensured to be stably realized.

8. An AC-DC converter control apparatus, comprising:

the first conversion module is used for outputting a first direct-current voltage after rectification according to a first preset mode;

the second conversion module is used for outputting a second direct current voltage after rectification is performed according to a second preset mode, wherein the first direct current voltage is not greater than the second direct current voltage, and the first preset mode and the second preset mode are the same or different;

further comprising: the temperature sensor is used for detecting a temperature parameter value in the discharging process of the capacitor;

and the control module is used for controlling the switching element to be switched off when the abnormity is detected, wherein the switching element is used for connecting the transformer and the capacitor.

9. A computer-readable storage medium, in which a computer program is stored, wherein the computer program is arranged to perform the method of any of claims 1 to 7 when executed.

10. An electronic device comprising a memory and a processor, wherein the memory has stored therein a computer program, and wherein the processor is arranged to execute the computer program to perform the method of any of claims 1 to 7.

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