WO2023078432A1

WO2023078432A1 - Power supply apparatus and power supply control method

Info

Publication number: WO2023078432A1
Application number: PCT/CN2022/130110
Authority: WO
Inventors: 冯雷
Original assignee: 锐捷网络股份有限公司
Priority date: 2021-11-05
Filing date: 2022-11-04
Publication date: 2023-05-11
Also published as: CN113972702B; CN113972702A

Abstract

A power supply apparatus and a power supply control method. The apparatus comprises at least two power supply input ends (2001), a switching module (2003), a control module (2004), a suppression module (2005), a switch module (2006), a power factor correction module (2007), and a power supply output end (2010). The capacitance voltage of the power factor correction module (2007) is sufficient to maintain voltages at two ends of the apparatus greater than a peak value of the voltage of any power supply input end (2001) when the apparatus operates normally, and when a power supply (101) is switched, the voltage of the power factor correction module (2007) can be maintained close to a peak value of an input voltage of the current power supply input end (2001). Moreover, since the suppression module (2005) is also provided in a circuit to suppress an impact current during switching, a current, which is generated at the moment when a new power supply input end (2001) is connected, is very small. When the voltage on an energy storage capacitor (20071) is close to or equal to an input peak voltage, the switch module (2006) is started without zero-cross detection, such that zero-current switching is achieved, a whole power supply switching process is completed, the waiting time during switching is shortened, and the switching efficiency is improved.

Description

Power supply device and power supply control method

Cross References to Related Applications

This application claims the priority of a Chinese patent application with application number 202111303946.1 and application title "power supply device and power supply control method" submitted to the China Patent Office on November 05, 2021, the entire contents of which are incorporated in this application by reference.

technical field

The present application relates to the field of electric power technology, in particular to power supply technology, and provides a power supply device and a power supply control method.

Background technique

In scenarios where stable power supply is required, the conventional way to ensure power supply reliability is to implement redundant power supply through two or more power supply devices connected to different input power supplies, but this method requires a large number of power supply devices and takes up The space is large, and the overall cost is relatively high. In order to solve these problems, a single power supply device supporting dual-input power supply mode products began to appear. This product can not only realize redundant power supply, but also takes up less space and lowers the total cost compared with the above power supply mode.

In products with a single power supply that supports dual-input power supply, in order to prevent the relay from generating an inrush current that is much greater than the normal operating current at the moment of power supply when the power supply is switched, and damage the devices on the circuit, a zero-crossing detection circuit is required. Switching is performed when the voltage reaches zero crossing, which increases the detection time.

Contents of the invention

Embodiments of the present application provide a power supply device and a power supply control method, which are used for suppressing an inrush current generated when a power supply is switched in a multi-power supply scenario.

In one aspect, a power supply device is provided, wherein the power supply device includes at least two power supply input terminals, a switching module, a control module, a suppression module, a switch module, a power factor correction module, and a power supply output terminal;

The at least two power supply input terminals are respectively connected to different power supply sources, the input terminal of the switching module is connected to the at least two power supply input terminals, and the first output terminal of the switching module is connected to the suppression module. The input terminal, the output terminal of the suppression module is respectively connected to the first input terminal of the power factor correction module, the switch module is connected in parallel to both ends of the suppression module, and the second output terminal of the switching module is connected to the power The second input terminal of the factor correction module, and the output terminal of the power factor correction module is connected to the power supply output terminal, and the control module is respectively connected to the control terminals of the switching module and the switching module;

When switching the power supply, the control module controls the switching module to perform a switching action to switch to another power supply input terminal for power supply, and the switched power signal output by the switching module passes through the suppression module for all The power factor correction module is charged, and when the voltage across the power factor correction module is greater than or equal to the voltage peak value of the switched power supply signal, the control module controls the switch module to turn on, so that the switched The power supply signal is input to the power supply output terminal through the switch module to supply power to the load.

In a possible implementation, the power factor correction module includes a power factor correction subcircuit and an energy storage capacitor, the first input terminal of the power factor correction subcircuit is connected to the output terminal of the suppression module, and the power The second input end of the factor correction sub-circuit is connected to the second output end of the switching module, the two output ends of the power factor correction sub-circuit are connected to the power supply output end, and the two ends of the energy storage capacitor are respectively connected to the two output terminals of the power factor correction sub-circuit, and the control module is connected to the control terminal of the power factor correction sub-circuit;

When switching the power supply, when the voltage across the energy storage capacitor is greater than or equal to the peak voltage of the switched power supply signal, the control module controls the switch module to turn on, and the control module also controls The power factor correction sub-circuit starts to work, so that the switched power supply signal is output to the power supply output terminal after being corrected by the power factor of the power factor correction sub-circuit.

In a possible implementation, the device further includes a detection module, the input terminal of the detection module is electrically connected to the at least two power supply input terminals, and the output terminal of the detection module is electrically connected to the control module ;

Wherein, the detection module is used to detect the power signals of the at least two power supply input terminals, and output the power detection result to the control module, and the control module selects the qualified power signal based on the power detection result power supply.

In a possible implementation, the detection module includes at least two detection chips, the detection end of each detection chip is connected to a power supply input end, and the communication end of each detection chip is connected to the control module ;

Each detection chip is used to detect the power signal input by the detection terminal, and output the power detection result to the control module through the communication terminal.

In a possible implementation, the device further includes at least two protection subcircuits, the input end of each protection subcircuit is connected to one of the power supply input ends, and the output end is connected to the corresponding detection chip. The detection terminal is connected, and each of the protection sub-circuits includes a fuse;

Wherein, the power signal input by each of the power supply input terminals is input to the detection terminal of the corresponding detection chip through the protection sub-circuit, and the fuse of each protection sub-circuit passes through a current greater than the set current. disconnected at a certain threshold.

In a possible implementation, when the power supply detection result indicates that the power signal corresponding to the currently connected power supply input terminal is abnormal, the control module sends a shutdown signal to the power factor correction module, indicating that the power factor correction The module stops working; after the power factor correction module stops working, the control module sends a disconnection signal to the switching module, and the switching module disconnects the connection with the currently connected power supply input terminal, and when the When the switch module is disconnected from the currently connected power supply input terminal, the control module controls the switch module to close, and sends a switch signal to the switch module.

In a possible implementation, the power supply device includes a first power supply input terminal and a second power supply input terminal, and the switching module includes a first relay, a second relay, a third relay and a fourth relay, and the first Both the relay and the second relay include a pair of input contacts and a pair of output contacts, and the third relay and the fourth relay both include a pair of input contacts and an output contact;

Wherein, the first power supply input end is connected to a pair of input contacts of the first relay, and one output contact of the first relay is connected to one input contact of the third relay, and the first The other output contact of a relay is connected to an input contact of the fourth relay; the second power supply input terminal is connected to a pair of input contacts of the second relay, and one of the second relays The output contact is connected to the other input contact of the third relay, the other output contact of the second relay is connected to the other input contact of the fourth relay, and the third relay is connected to the other input contact of the fourth relay. The output contact of the fourth relay is connected to the input terminal of the suppression module and the switch module, and the control terminals of the first relay, the second relay, the third relay and the fourth relay are all connected to the control module .

In one possible implementation,

In the case of power supply by the first power signal input through the first power supply input terminal, the input contact and output contact of the first relay are connected, and the input contact and output contact of the second relay disconnected, the input contact connected to the output contact of the first relay in the third relay and the fourth relay is connected to the output contact, and the first power signal is input to the suppression module and the the switch module;

In the case of power supply by the second power signal input through the second power supply input terminal, the input contact and output contact of the first relay are disconnected, and the input contact and output contact of the second relay connected, the input contact connected to the output contact of the second relay among the third relay and the fourth relay is connected to the output contact, and the second power supply signal is input to the suppression module and the switch module.

In a possible implementation, the device further includes an output transformation module;

Wherein, the power factor correction module is electrically connected to the power supply output terminal through the output conversion module;

The output conversion module performs voltage conversion on the power signal output by the power factor correction module, and outputs the converted power signal to the power supply output terminal.

In one aspect, a power supply control method is provided, which is applied to the above power supply device, and the method includes:

When switching the power supply, the control module sends a switching signal to the switching module to control the switching module to perform a switching action to switch to another power supply input terminal for power supply, and the switched power signal output by the switching module passes through The suppression module charges the power factor correction module;

When the voltage across the power factor correction module is greater than or equal to the peak voltage of the switched power signal, the control module controls the switch module to be turned on, so that the switched power signal is input through the switch module to the power supply output to supply power to the load.

In a possible implementation, when switching the power supply, before the control module sends a switching signal to the switching module, the method further includes:

The control module receives the power detection signal output by the detection module;

When the power supply detection signal indicates that the power supply signal corresponding to the currently connected power supply input terminal is abnormal, the control module sends a shutdown signal to the power factor correction sub-circuit in the power factor correction module, so that the power factor The syndrome sub-circuit stops working, and the control module sends a disconnection signal to the switching module, so that the switching module disconnects the connection with the currently connected power supply input terminal;

When detecting that the switch module has disconnected from the currently connected power supply input terminal, the control module instructs the switch module to turn off.

In a possible implementation, after the control module receives the power detection signal output by the detection module, the method further includes:

If the power supply detection result indicates that there is only one power supply input terminal corresponding to a normal power supply signal, the control module instructs the switching module to connect to the power supply input terminal;

If the power supply detection result indicates that there are multiple power supply input terminals corresponding to normal power supply signals, the control module instructs the switching module to connect to the power supply input terminal with the highest input voltage;

If the power supply detection result indicates that there are multiple power supply input terminals that are normal and have the same input voltage, the control module instructs the switching module to connect to the power supply input terminal that is powered on first, or, according to the preset priority A level indicates that the switching module is connected to a corresponding power supply input.

In a possible implementation, after the control module controls the switch module to turn on, it further includes:

The control module sends a starting signal to the power factor correction sub-circuit, so that the power factor correction sub-circuit starts to work.

In the embodiment of the present application, the input end of the switch module in the power supply device is connected to multiple power supply input ends, and the first output end is electrically connected to the input end of the suppression module and the switch module, and the second output end is connected to the power factor correction module One end of the suppression module and the switch module are connected to the other end of the power factor correction module, and the control module is electrically connected to the switching module and the control end of the suppression circuit respectively. When the power supply is switched, because there is a suppression module in the circuit to suppress the inrush current, the current generated at the moment when the new power supply input is connected is very small, and zero current switching is realized, and the capacitance of the power factor correction module can be large enough to make The voltage difference between the voltage at the power supply input terminal and the voltage at both ends of the power factor correction module is very small. By charging the power factor correction module, only when the voltage at both ends of the power factor correction module is greater than or equal to the input peak voltage, turn on the switch module to short-circuit the suppression module , the power signal is output to the subsequent circuit through the switch module to complete the entire power switching process. There is no need for zero-crossing detection in this process, which reduces the switching waiting time and improves switching efficiency. It can also be applied to AC power and DC power.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

FIG. 1 is a schematic diagram of a power supply architecture provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a power supply device provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a detection sub-circuit provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a protection sub-circuit provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of an output conversion module provided in an embodiment of the present application;

Fig. 6 is a schematic structural diagram of a dual-input switching power supply device provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram when InputA is powered by an embodiment of the present application;

FIG. 8 is a schematic structural diagram when the power is supplied by InputB provided by the embodiment of the present application;

FIG. 9 is a schematic flowchart of a power supply control method provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the application clearer, the technical solutions in the embodiments of the application will be clearly and completely described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

Redundant power supply means that two or more power supplies cooperate to supply power. When one power supply fails, the other power supply can immediately take over its work. In this way, continuous and stable power supply can be provided.

Commonly, in order to prevent a large inrush current from being generated during power switching and damage various devices in the circuit, it is necessary to perform zero-crossing detection on the input AC voltage, and switch when the input voltage crosses zero, but this method requires The waiting time is long, the switching efficiency is low, and it can only be applied to the situation of AC power supply.

In the embodiment of the present application, the input end of the switch module in the power supply device is connected to multiple power supply input ends, and the first output end is electrically connected to the input end of the suppression module and the switch module, and the second output end is connected to the power factor correction module One end of the suppression module and the switch module are connected to the other end of the power factor correction (English: Power Factor Correct, abbreviated as PFC) module, and the control module is electrically connected to the switching module and the control terminal of the suppression circuit respectively. Among them, the capacitance voltage of the energy storage capacitor included in the PFC module is sufficient to maintain the voltage of the power factor correction module greater than the peak voltage input by any power supply input terminal when the device is working normally, and can maintain the power factor correction module when the power supply is switched. The voltage is close to the peak input voltage of the current power supply input terminal, and because there is a suppression module in the circuit to suppress the inrush current when switching, so the current generated at the moment of connection of the new power supply input terminal is very small. When the voltage on the energy storage capacitor is close to or equal to Turn on the switch module when the peak voltage is input, no need for zero-crossing detection, realize zero-current switching, complete the entire power switching process, reduce the switching waiting time, improve switching efficiency, and can be applied to both AC power and DC power.

After introducing the design idea of the embodiment of the present application, the following briefly introduces the applicable application scenarios of the technical solution of the embodiment of the present application. It should be noted that the application scenarios introduced below are only used to illustrate the embodiment of the application and not limited. In the specific implementation process, the technical solutions provided by the embodiments of the present application can be flexibly applied according to actual needs.

The solution provided by the embodiment of the present application can be applied to most scenarios that require redundant power supply. As shown in FIG. 102. An electric load 103.

Wherein, the power supply 101 can be an AC power supply or a DC power supply, and the power supply device 102 can be powered by connecting the input port of the power supply device 102 to each power supply source 101 .

The output port of the power supply device 102 is connected to the power receiving load 103 to realize power transmission from the power supply device 102 to the power receiving load 103. When the current power supply 101 is abnormal, the power supply device 102 uses another normal power supply 101 for the power receiving load. The electric load 103 transmits power to realize redundant power supply. Wherein, the power receiving load may be any load that needs power supply.

Please refer to FIG. 2, which is a schematic structural diagram of a power supply device provided by the embodiment of the present application. As shown in FIG. 2005 , a switch module 2006 , a PFC module 2007 and a power supply output terminal 2010 .

Wherein, each power supply input 2001 is connected to a power supply, the input of the switching module 2003 is electrically connected to each power supply input 2001, an output of the switching module 2003 is connected to the suppression module 2005 and the switch module 2006, and the switching module 2003 The other output end is connected with an input end of the PFC module 2007, the output end of the suppression module 2005 is connected with the other input end of the PFC module 2007, the control module 2004 and the switching module 2003, the switch module 2006 and the control end of the PFC module 2007 are all connect.

When power switching is required, the control module 2004 sends a switching signal to the switching module 2003, and the switching module 2003 establishes a connection with the new power supply input terminal 2001 in response to the switching signal, so that the power supply signal output by the new power supply input terminal 2001 passes through the suppression The module 2005 is input to the PFC module 2007. Since the voltage at both ends of the PFC module 2007 is greater than the maximum voltage input at any power supply input terminal when the PFC module 2007 is in normal operation, the voltage difference between the input voltage at the power supply input terminal 2001 and the voltage at both ends of the PFC module 2007 is very small. In addition, a suppression module 2005 is connected in series in the circuit to suppress the inrush current, so the current generated during the switching process is very small and will not cause damage to the circuit. When the control module 2004 detects that the voltage at both ends of the PFC module 2007 reaches or approaches the input peak voltage, The switch module 2006 is controlled to be turned on, and the switch module 2006 is in a connected state at this time, so that the suppression module 2005 is short-circuited to complete the power switching, and the zero-crossing detection of the input voltage is not required during the whole process, which speeds up the switching speed.

In a possible implementation, the suppression module 2005 can be realized by a resistor, for example, a thermistor can be used, and its resistance value increases with the increase of temperature, that is, when a large current is generated in the circuit, its resistance value will increase. Then it becomes extremely large, which can effectively reduce the size of the inrush current in the circuit.

In a possible implementation, the switch module 2006 can be realized by a switch, for example, a single-pole single-throw switch or other switching devices with the same function, such as a relay, can be used.

In the embodiment of this application, the suppression module 2005 and the switch module 2006 essentially constitute a current suppression circuit. When the power supply is switched, the switch module 2006 is turned off. The inrush current in the circuit turns on the switch module 2006 when the circuit tends to be stable, so that the suppression module 2005 is short-circuited, and the power signal is sent to the subsequent circuit through the switch module 2006 .

In a specific application, the PFC module 2007 is used to reduce the phase difference between the input voltage and the current in the power supply input terminal 2001, and improve the utilization rate of electric energy. The voltage across the terminal is higher than the voltage at the input terminal of the power supply. When the electrical signal at the input terminal of the current power supply is abnormal, the control module 2004 controls the PFC module 2007 to stop running, and controls the PFC module 2007 to restart running after the entire switching process is completed.

In a possible implementation, the PFC module 2007 may include an energy storage capacitor 20071 and a PFC sub-circuit 20072, and the voltage at both ends of the energy storage capacitor 20071 is greater than the maximum voltage input by any power supply input terminal during normal operation. Wherein, the first input terminal of the PFC subcircuit 20072 is connected to the output terminal of the suppression module 2005, the second input terminal of the PFC subcircuit 20072 is connected to the second output terminal of the switching module 2003, and the two output terminals of the PFC subcircuit 20072 are connected to To the power supply output terminal 2010 , the two output terminals of the PFC sub-circuit 20072 are also connected to both ends of the energy storage capacitor 20071 , and the control module 2004 is connected to the control terminal of the PFC sub-circuit 20072 .

When switching the power supply, when the voltage across the energy storage capacitor 20071 is greater than or equal to the peak voltage of the switched power supply signal, the control module 2004 controls the switch module 2006 to turn on, and the control module 2004 also controls the PFC sub-circuit 20072 to start working , so that the switched power supply signal is output to the power supply output terminal 2010 after being corrected by the PFC sub-circuit 20072 for power factor.

In the power supply device provided by the embodiment of the present application, as shown in FIG. 2 , a detection module 2002 may also be included. The input terminal of the detection module 2002 is electrically connected to the power supply input terminal 2001 , and the output terminal is electrically connected to the control module 2004 . The detection module 2002 is responsible for detecting the power signal input by each power supply input terminal 2001, judging whether it can supply power normally, and sending the detection result to the control module 2004, so that the control module 2004 can select an available power signal for access based on the detection result .

In a specific application, the detection module 2002 may include multiple detection subcircuits, each detection subcircuit includes a detection chip, the detection end of each detection chip is connected to a power supply input end 2001 , and the communication end is connected to the control module 2004 . Wherein, each detection chip outputs the power detection result to the control module 2004 through the communication terminal after detecting the power signal input from the detection terminal.

Since the detection sub-circuits corresponding to each power supply input terminal 2001 are similar, one circuit is specifically introduced here. Please refer to FIG. 3 , which is a schematic structural diagram of the detection subcircuit provided by the embodiment of the present application. The detection subcircuit may include a plurality of diodes, an integrated chip IC5 and a plurality of resistors, and the plurality of diodes include the diode D29 shown in FIG. 3 , D33, D30, D34, D35, etc., and the multiple resistors include R59, R61, R63, R71, R74, R75, R79, etc. shown in Figure 3.

Among them, the anodes of D29 and D30 are respectively connected to N1-1A and L1-1A, L1-1A/N1-1A are two input terminals, both of which are connected to a power supply input terminal 2001, and the cathodes are respectively connected to the anodes of D33 and D34, D33 and the cathode of D34 are connected to four series resistors R59/R63/R71/R75, the other end of R75 is connected to pin 15 of IC5, and one end of C42/R82, the other end of C42/R82 is grounded, and 4 of IC5 The pin is connected to the peak-to-peak voltage (English: Voltage Peak-Peak, abbreviated as VPP) terminal through R73, and the VPP terminal can output the transformed voltage.

In addition, pin 18 and pin 19 of the integrated chip IC5 are connected to P_PGD1 and P_PGC1 respectively, and P_PGD1 and P_GC1 are the programming pins of IC5. Program, L1-1A/N1-1A through the following D29/D30/D33/D34, R59/R63/R71/R75 and R82/C42 devices to collect power signal input and send it to pin 15 of IC5, through the voltage division of multiple resistors, so that The input voltage of the pin 15 of the integrated chip IC and the power supply voltage form a proportional relationship after stepping down, so that the actual value of the input voltage can be judged by the input voltage of the pin 15 of the integrated chip IC, and the power supply detection result is passed through the integrated chip IC5 The communication terminal, that is, the pin 10 shown in Figure 3 is output to the control module.

Pin 1 of IC5 is connected to the high voltage end of the chip power supply through R61, pin 20 of IC5 is connected to the reference voltage end, both ends of C37 are connected to pin 20 and R61 respectively, pin 11 is connected to the high voltage end through R66, and pin 16 is connected to the high voltage end through R74 And diodes are connected to the reference voltage terminal to form a power supply loop through

pins

1, 11, 16 and 20 to supply power to IC5.

In actual application, each detection chip sends its detection result to the control module 2004, and when the control module 2004 receives the abnormal signal sent by the detection chip corresponding to the currently used power supply input terminal 2001, it will send a shutdown signal to the PFC module 2007, Instruct the PFC module 2007 to stop working, and then send a disconnection signal to the switching module 2003, instructing the switching module 2003 to disconnect from the current power supply input terminal 2001. Since the voltage at both ends of the energy storage capacitor 20071 will remain for a period of time at this time, the input The voltage at the terminal 2001 is lower than the voltage on the energy storage capacitor 20071, so there will be no current flowing to the energy storage capacitor 20071, and the switching module 2003 can realize zero current disconnection. After the disconnection is completed, the control module 2004 controls the switch module 2006 to close, and sends a switch signal to the switch module 2003, instructing the switch module 2003 to connect to the new power supply input terminal 2001 .

Specifically, after the control module 2004 receives the abnormal signal, it can select the power supply input terminal 2001 with a normal power supply signal to supply power to the circuit. If there are multiple ports with normal power supply signals, it can select the power supply input terminal 2001 with the highest input voltage. If the input voltages of multiple ports are equal, the port powered on first is selected, or the corresponding power supply input terminal 2001 is selected according to the preset port priority.

In order to prevent a large current from damaging the components in the detection sub-circuit when the circuit is abnormal, the embodiment of the present application also includes a plurality of protection sub-circuits, and each protection sub-circuit corresponds to a power supply input terminal 2001. Since each protection sub-circuit The structures are similar, here only one protection sub-circuit is taken as an example for introduction.

Please refer to FIG. 4 , which is a schematic structural diagram of a protection sub-circuit provided by an embodiment of the present application. The protection sub-circuit may include multiple capacitors, multiple resistors, multiple piezoresistors, anti-electric tubes, and multiple fuses. A plurality of capacitors includes capacitor CY1, capacitor CY2, and capacitor CY3 as shown in Figure 4, a plurality of resistors includes resistors R1-R6 as shown in Figure 4, and a plurality of varistors includes resistors MOV1 and resistors as shown in Figure 4. MOV2, resistor MOV3, anti-electricity tube includes FDG1, multiple fuses include fuse F1 and fuse F2 as shown in FIG. 4 .

Among them, the two input terminals L1 and N1 of the protection sub-circuit are respectively connected to one end of capacitor CY1 and capacitor CY2 and one end of fuse F1 and fuse F2, the other end of capacitor CY1 and capacitor CY2 is grounded, and fuse F1 and fuse The other end of F2 is respectively connected to the two ends of the capacitor CY3, the two ends of the three series-connected resistors R1/R3/R5, and the two ends of the three series-connected resistors R2/R4/R6 and respectively connected to the two output ports L1-1 and N1-1.

In specific applications, the two inputs L1/N1 of the circuit are connected to the same power supply input terminal 2001, and the output after passing through the protection circuit is L1-1/N1-1, whose size remains basically unchanged, and the two output terminals L1-1 and N1-1 are respectively connected to the two input terminals L1-1A and N1-1A of the detection sub-circuit. When the circuit is abnormal and generates a large current, the fuse in the protection circuit will be disconnected in time to protect other components in the circuit.

The power supply device provided by the embodiment of the present application also includes an output transformation module 2009, see FIG. 5, which is a schematic structural diagram of the output transformation module 2009 provided by the embodiment of the present application. The circuit includes multiple capacitors, resistors, multiple transistors, and inductors. coils and transformers. Multiple capacitors include capacitor C4, capacitor C7, and capacitor C8 as shown in Figure 5, multiple transistors include transistor Q9 and transistors Q13-Q15 as shown in Figure 5, the transformer is T4 as shown in Figure 5, and the inductance coil is as shown in Figure 5. L5 shown in Figure 5, the resistance is R4 shown in Figure 5.

Among them, the input terminal Vin is connected to one end of C4 and Q9, the other end of C4 is connected to pin 2 of T4, and is connected to one end of C7, the other end of Q9 is connected to pin 1 of T4, and is connected to one end of Q13, Q13 The other end of is connected to the other end of C7 and grounded. Pin 3 of T4 is connected to one end of L5, pin 4 of T4 is connected to one end of Q14, pin 5 of T4 is connected to one end of Q15, the other ends of Q14 and Q15 are connected to C8 and one end of R4 and grounded, the other end of L5 One end is connected with the other end of C8 and R4 and connected with the output terminal Vout.

In actual application, the input terminal Vin of the module is electrically connected to the output terminal of the PFC module 2007, and the output terminal Vout is electrically connected to the power supply output terminal 2010, and its main function is to convert the output of the PFC module 2007 into the final desired output voltage .

In the power supply device provided by the embodiment of the present application, as shown in FIG. 6, the device may also include at least two electromagnetic interference filtering (English: Electro Magnetic Interference, abbreviated as EMI) modules, and the input end of each EMI module is connected to a power supply The input terminal 2001 and the output terminal are connected to the detection module 2002 and the switching module 2003 .

Among them, each EMI module filters the input power signal to effectively suppress the interference of harmful electromagnetic waves on its own working circuit or other sensitive equipment.

In order to facilitate the further introduction of the switching module 2003, two power supply sources are used as examples for introduction here. Please refer to FIG. 6 , which is a schematic structural diagram of a dual-input switching power supply device provided by an embodiment of the present application. Wherein, the power supply device includes a first power supply input terminal 20011 and a second power supply input terminal 20012, the switching module 2003 includes a first relay Relay1A, a second relay Relay1B, a third relay Relay2A and a fourth relay Relay2B, the first relay Relay1A and the second relay The relays Relay2A each include a pair of input contacts and a pair of output contacts, as shown in Figure 6, the first relay Relay1A includes input contacts A1-1 and A1-3 and output contacts A1-2 and A1-4, The second relay Relay1B includes input contacts B1-1 and B1-3 and output contacts B1-2 and B1-4, the third relay and the fourth relay both include a pair of input contacts and an output contact, the input contacts They are A2-1/A2-3 and B2-1/B2-3 respectively, and the output contacts are A2-2 and B2-2 respectively.

Referring to Fig. 6, the first power supply input terminal 20011 is connected to the power supply inputA, the first power supply input terminal 20012 is connected to the power supply inputB, and inputA and inputB are respectively input to EMIA and EMIB for filtering processing, and the two output terminals of EMIA are connected to The input terminal of detection subcircuit A and contacts A1-1 and A1-3, the two output terminals of EMIB are connected to the input terminal of detection subcircuit B and contacts B1-1 and B1-3, detection subcircuit A and detection subcircuit The output terminal of circuit B is connected to the control module, and the contacts A2-2 and B2-2 are connected to the PFC sub-circuit through the parallel resistance RT and the switch ES, and the control terminals of the switch ES, four relays and the PFC sub-circuit are all Connect to control module 2004.

InputA and InputB respectively represent two power supply signals, InputA and InputB are respectively filtered by EMIA and EMIB and then input to the subsequent circuit, detection sub-circuit A and detection sub-circuit B represent the detection module 2002 corresponding to the two power supply input terminals 2001 , which are used to detect whether the voltages of InputA and InputB are normal, and transmit the detection signal to the control module 2004. The four switching relays Relay1A, Relay2A, Relay1B and Relay2B form the switching module 2003. The switch ES represents the switching module 2006, and the resistance RT represents the suppression Module 2005, the switch ES and the resistor RT together form a surge suppression circuit.

For specific applications, refer to Figure 7, which is a schematic structural diagram of the power supply provided by Input A in the embodiment of the present application. If Input A has a normal voltage and Input B does not have a normal voltage, the control module sends a relay drive (Relay Drive) signal , drive Relay1A to close, and at the same time, the A2-1 and A2-2 of Relay2A and the B2-1 and B2-2 contacts of Relay2B are closed, and InputA passes through EMIA, Relay1A, A2-1 and A2-2 contacts of Relay2A and B2 of Relay2B -1 and B2-2 contacts supply power to the surge suppression circuit, PFC module 2007 and output conversion module 2009 to form a power supply loop.

Similarly, see Figure 8, which is a schematic diagram of the structure of the power supply provided by Input B in the embodiment of the present application. If Input B has a normal voltage and Input A does not have a normal voltage, the control module sends a Relay Drive signal to drive Relay1B to close. At the same time, A2-3 and A2-2 of Relay2A and B2-3 and B2-2 of Relay2B are closed, Input B passes through EMI B, Relay1B, A2-3 and A2-2 of Relay 2A and B2-3 of Relay2B and the B2-2 contact supply power to the surge suppression circuit, the PFC module 2007 and the output conversion module 2009 to form a power supply loop.

Taking the current power supply from InputA as an example, when the detection sub-circuit A detects that the current power signal is abnormal, and the detection result of the detection sub-circuit B is normal, the detection sub-circuit A sends an abnormal signal to the control module 2004, and the control module 2004 immediately turns off the PFC Module 2007, and control A2-1 and A2-2 of Relay1A, Relay2A and B2-1 and B2-2 of Relay2B to disconnect, then control switch ES to disconnect, return to the situation shown in Figure 5, and then control Relay1B is closed, and contacts A2-3 and A2-2 of Relay2A and B2-3 and B2-2 of Relay2B are closed at the same time. When the control module 2004 detects the voltage of the PFC module 2007, that is, the voltage at both ends of the energy storage capacitor 20071 reaches the power supply When the peak value of the input voltage at the input terminal is reached, the control switch ES is closed to start the PFC module 2007 .

The process of switching from InputB to InputA is the same and will not be repeated here.

Referring to FIG. 9 , based on the same inventive concept, the embodiment of the present application also proposes a power supply control method, which can be executed by a control module of a power supply device, and the flow of the method is introduced as follows.

Step 901: When switching the power supply, the control module sends a switching signal to the switching module.

Specifically, when the power supply needs to be switched, the control module controls the switching module to perform a switching action to switch from the current power supply input terminal to another power supply input terminal for power supply, and the switching module outputs the switched power supply signal, and the switched power supply signal Charge the PFC module through the suppression module transmission;

Step 902: When the voltage across the PFC module is greater than or equal to the peak voltage of the switched power signal, the control module controls the switch module to turn on, so that the switched power signal is input to the power supply output terminal through the switch module to supply power to the load.

Specifically, when the voltage at both ends of the PFC module is greater than or equal to the voltage peak value of the switched power signal, that is, the voltage at both ends of the energy storage capacitor included in the PFC is greater than or equal to the voltage peak value of the switched power signal, then it can be controlled The switch module is turned on, so that the suppression module is short-circuited, and the switched power supply signal is input to the subsequent stage circuit through the switch module to realize power supply for the load.

In the embodiment of the present application, the detection module can also detect each power supply signal, and the output power detection signal is input to the control module, and the control module determines that the power detection signal indicates that the power signal corresponding to the currently connected power supply input terminal is abnormal , it is judged that power switching is required, so that the control module sends a shutdown signal to the PFC sub-circuit, so that the PFC sub-circuit stops working, and the control module sends a disconnection signal to the switching module, so that the switching module is disconnected from the currently connected power supply input end connection.

When the control module detects that the switch module has been disconnected from the currently connected power supply input terminal, the control module instructs the switch module to close and sends a switch signal to the switch module, wherein the switch signal is used to instruct the switch module to switch to a new power supply input.

In specific applications, if the power supply detection result indicates that there is only one power supply input corresponding to a normal power signal, the control module instructs the switching module to connect to the power supply input; if the power supply detection result indicates that there are multiple power supply input corresponding to the power signal When normal, the control module instructs the switching module to connect to the power supply input terminal with the highest input voltage; The input terminal is connected, or the switching module is connected with the corresponding power supply input terminal according to the preset priority instruction.

In the embodiment of the present application, the switched power supply signal gradually charges the energy storage capacitor. When it is detected that the voltage across the energy storage capacitor is greater than the set voltage peak value, the control module instructs the switch module to turn off, and after the switch module is turned off, Send a starting signal to the PFC sub-circuit, so that the PFC sub-circuit starts to work for power factor correction, and transmits the corrected power supply signal to the subsequent stage circuit.

Since the specific implementation manner of each step in the above method has been introduced in detail when the above power supply device was introduced, it will not be repeated here.

While preferred embodiments of the present application have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, the appended claims are intended to be construed to cover the preferred embodiment and all changes and modifications which fall within the scope of the application.

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

Claims

A power supply device, wherein the power supply device includes at least two power supply input terminals, a switching module, a control module, a suppression module, a switch module, a power factor correction module, and a power supply output terminal;

The at least two power supply input terminals are respectively connected to different power supply sources, the input terminal of the switching module is connected to the at least two power supply input terminals, and the first output terminal of the switching module is connected to the suppression module. The input terminal, the output terminal of the suppression module is respectively connected to the first input terminal of the power factor correction module, the switch module is connected in parallel to both ends of the suppression module, and the second output terminal of the switching module is connected to the power The second input terminal of the factor correction module, and the output terminal of the power factor correction module is connected to the power supply output terminal, and the control module is respectively connected to the control terminals of the switching module and the switching module;

When switching the power supply, the control module controls the switching module to perform a switching action to switch to another power supply input terminal for power supply, and the switched power signal output by the switching module passes through the suppression module for all The power factor correction module is charged, and when the voltage across the power factor correction module is greater than or equal to the voltage peak value of the switched power supply signal, the control module controls the switch module to turn on, so that the switched The power supply signal is input to the power supply output terminal through the switch module to supply power to the load.
The device according to claim 1, wherein the power factor correction module comprises a power factor correction subcircuit and an energy storage capacitor, the first input terminal of the power factor correction subcircuit is connected to the output terminal of the suppression module, The second input end of the power factor correction sub-circuit is connected to the second output end of the switching module, the two output ends of the power factor correction sub-circuit are connected to the power supply output end, and the energy storage capacitor The two ends are respectively connected to the two output terminals of the power factor correction sub-circuit, and the control module is connected to the control terminal of the power factor correction sub-circuit;

When switching the power supply, when the voltage across the energy storage capacitor is greater than or equal to the peak voltage of the switched power supply signal, the control module controls the switch module to turn on, and the control module also controls The power factor correction sub-circuit starts to work, so that the switched power supply signal is output to the power supply output terminal after being corrected by the power factor of the power factor correction sub-circuit.
The device according to claim 1, wherein the device further comprises a detection module, the input terminal of the detection module is electrically connected to the at least two power supply input terminals, and the output terminal of the detection module is connected to the control module electrical connection;

Wherein, the detection module is used to detect the power signals of the at least two power supply input terminals, and output the power detection result to the control module, and the control module selects the qualified power signal based on the power detection result power supply.
The device according to claim 3, wherein the detection module comprises at least two detection chips, the detection end of each detection chip is connected to a power supply input end, and the communication end of each detection chip is connected to the said control module;

Each detection chip is used to detect the power signal input by the detection terminal, and output the power detection result to the control module through the communication terminal.
The device according to claim 4, wherein said device further comprises at least two protection sub-circuits, the input of each said protection sub-circuit is connected to one of said power supply input terminals, and the output terminal is connected to the corresponding said The detection end of the detection chip is connected, and each of the protection sub-circuits includes a fuse;

Wherein, the power signal input by each of the power supply input terminals is input to the detection terminal of the corresponding detection chip through the protection sub-circuit, and the fuse of each protection sub-circuit passes through a current greater than the set current. disconnected at a certain threshold.
The device according to claim 3, wherein when the power supply detection result indicates that the power supply signal corresponding to the currently connected power supply input terminal is abnormal, the control module sends a shutdown signal to the power factor correction module to instruct the The power factor correction module stops working; after the power factor correction module stops working, the control module sends a disconnection signal to the switching module, and the switching module disconnects the connection with the currently connected power supply input terminal, And when the connection between the switch module and the currently connected power supply input terminal is disconnected, the control module controls the switch module to turn off, and sends a switch signal to the switch module.
The device according to any one of claims 1-6, wherein the power supply device comprises a first power supply input terminal and a second power supply input terminal, and the switching module comprises a first relay, a second relay, a third relay and a fourth relay , the first relay and the second relay each include a pair of input contacts and a pair of output contacts, and the third relay and the fourth relay each include a pair of input contacts and an output contact;

Wherein, the first power supply input end is connected to a pair of input contacts of the first relay, and one output contact of the first relay is connected to one input contact of the third relay, and the first The other output contact of a relay is connected to an input contact of the fourth relay; the second power supply input terminal is connected to a pair of input contacts of the second relay, and one of the second relays The output contact is connected to the other input contact of the third relay, the other output contact of the second relay is connected to the other input contact of the fourth relay, and the third relay is connected to the other input contact of the fourth relay. The output contact of the fourth relay is connected to the input terminal of the suppression module and the switch module, and the control terminals of the first relay, the second relay, the third relay and the fourth relay are all connected to the control module .
The apparatus of claim 7, wherein,

In the case of power supply by the first power signal input through the first power supply input terminal, the input contact and output contact of the first relay are connected, and the input contact and output contact of the second relay disconnected, the input contact connected to the output contact of the first relay in the third relay and the fourth relay is connected to the output contact, and the first power signal is input to the suppression module and the the switch module;

In the case of power supply by the second power signal input through the second power supply input terminal, the input contact and output contact of the first relay are disconnected, and the input contact and output contact of the second relay connected, the input contact connected to the output contact of the second relay among the third relay and the fourth relay is connected to the output contact, and the second power supply signal is input to the suppression module and the switch module.
The apparatus of claim 1, further comprising an output transformation module;

Wherein, the power factor correction module is electrically connected to the power supply output terminal through the output conversion module;

The output conversion module performs voltage conversion on the power signal output by the power factor correction module, and outputs the converted power signal to the power supply output terminal.
A power supply control method applied to the power supply device according to any one of claims 1-9, the method comprising:

When switching the power supply, the control module sends a switching signal to the switching module to control the switching module to perform a switching action to switch to another power supply input terminal for power supply, and the switched power signal output by the switching module passes through The suppression module charges the power factor correction module;

When the voltage across the power factor correction module is greater than or equal to the peak voltage of the switched power signal, the control module controls the switch module to be turned on, so that the switched power signal is input through the switch module to the power supply output to supply power to the load.
The method according to claim 10, when switching the power supply, before the control module sends a switching signal to the switching module, the method further includes:

The control module receives the power detection signal output by the detection module;

When the power supply detection signal indicates that the power supply signal corresponding to the currently connected power supply input terminal is abnormal, the control module sends a shutdown signal to the power factor correction sub-circuit in the power factor correction module, so that the power factor The syndrome sub-circuit stops working, and the control module sends a disconnection signal to the switching module, so that the switching module disconnects the connection with the currently connected power supply input terminal;

When detecting that the switch module has disconnected from the currently connected power supply input terminal, the control module instructs the switch module to turn off.
The method according to claim 11, after the control module receives the power detection signal output by the detection module, the method further comprises:

If the power supply detection result indicates that there is only one power supply input terminal corresponding to a normal power supply signal, the control module instructs the switching module to connect to the power supply input terminal;

If the power supply detection result indicates that there are multiple power supply input terminals corresponding to normal power supply signals, the control module instructs the switching module to connect to the power supply input terminal with the highest input voltage;

If the power supply detection result indicates that there are multiple power supply input terminals that are normal and have the same input voltage, the control module instructs the switching module to connect to the power supply input terminal that is powered on first, or, according to the preset priority A level indicates that the switching module is connected to a corresponding power supply input.
The method according to any one of claims 10-12, wherein, after the control module controls the switch module to be turned on, further comprising:

The control module sends a starting signal to the power factor correction sub-circuit, so that the power factor correction sub-circuit starts to work.