CN111525675A - An AC-DC switching power supply circuit, method and circuit breaker - Google Patents

Abstract

The embodiment of the invention discloses an alternating current-direct current switching power supply circuit, a method and a circuit breaker. The alternating current-direct current switching power supply circuit comprises a switching circuit, a power supply switch, an arc extinguishing circuit, an alternating current power supply input end, a direct current power supply input end and a power supply output end; when the switching circuit controls the connection between the input end of the alternating current power supply and the power supply switch, the switching circuit controls the disconnection between the arc extinguishing circuit and the power supply output end, so that when the input end of the alternating current power supply is connected with the power supply switch, the direct current power supply is disconnected with the power supply output end, and alternating current power supply is realized when the power supply switch is closed; and when the direct current power supply input end is controlled to be conducted with the power supply switch, the arc extinguishing circuit is controlled to be conducted with the power supply output end, so that the direct current power supply is conducted with the power supply output end, and direct current power supply is achieved when the power supply switch is closed. Therefore, the alternating current power supply and the direct current power supply can be conveniently switched by only one switching circuit, and the power supply efficiency and the power supply reliability of the load are improved.

Description

An AC-DC switching power supply circuit, method and circuit breaker

technical field

Embodiments of the present invention relate to the field of electrical technology, and in particular, to an AC-DC switching power supply circuit, method, and circuit breaker.

Background technique

The AC/DC hybrid distribution network combines the advantages of AC and DC, and can provide users with a more reliable and efficient power supply method. DC power shows certain advantages in efficiency, and AC power is dominant in cost and stability. At present and for a long time in the future, AC and DC will still have different advantages and coexist.

Now, various electrical devices are gradually supporting DC power input while still adapting to AC power input, such as air conditioners, TVs, IT servers, charging piles, etc. In the switching power supply of AC and DC power supply, separate power supply circuits are usually designed for the DC power supply and the AC power supply, and circuit breakers are also required in their respective circuits to realize the use of DC circuit breakers to switch to DC circuits when DC power supply is required. , when the AC power supply is required to switch to the AC circuit through the AC circuit breaker, the separate design of the circuit and the use of multiple circuit breakers often cause the switching power supply of the entire AC and DC power supply to be complicated and inefficient.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide an AC-DC switching power supply circuit, method, and circuit breaker, so as to realize convenient switching between AC power and DC power through only one switching circuit, and improve power supply efficiency and reliability of power supply to loads.

In a first aspect, an embodiment of the present invention provides an AC-DC switching power supply circuit, including: a switching circuit, a power supply switch, an arc extinguishing circuit, an AC power input terminal, a DC power input terminal and a power output terminal, and the power output terminal is used to connect load;

The power supply switch includes a first end and a second end, and the second end is electrically connected with the power output end;

The arc extinguishing circuit includes a third end and a fourth end, and the third end is electrically connected to the input end of the DC power supply;

The switching circuit is respectively electrically connected with the AC power input terminal, the first terminal, the second terminal, the third terminal and the fourth terminal, and is used to control the conduction state between the AC power input terminal and the first terminal, the third terminal and the third terminal The conduction state between one end and the conduction state between the fourth end and the second end; and when controlling the conduction between the AC power input end and the first end, the fourth end and the second end are controlled to be disconnected; and when the third end is controlled to be connected to the first end, the fourth end is controlled to be connected to the second end.

Optionally, the switching circuit includes a first switching switch and a second switching switch;

The first switch includes a first contact, a second contact and a common contact, and the second switch includes a third contact and a fourth contact;

The first contact is electrically connected to the input end of the AC power supply, the second contact is electrically connected to the third end of the arc extinguishing circuit, the common contact is electrically connected to the first end of the power supply switch; the third contact is electrically connected to the third end of the arc extinguishing circuit. The four terminals are electrically connected, and the fourth contact is connected to the second terminal of the power supply switch.

Optionally, the first switch and the second switch are mechanical linkage switches.

Optionally, it also includes a controller, the controller includes a first detection terminal, a second detection terminal, a first output terminal and a second output terminal; the first switch and the second switch both include a control terminal;

The first detection terminal is electrically connected to the first contact, the first output terminal is electrically connected to the control terminal of the first switch, the second detection terminal is electrically connected to the second contact, and the second output terminal is electrically connected to the control terminal of the second switch. terminal electrical connection.

The controller is used to output a first control signal through the first output terminal to control the disconnection of the first contact and the common contact, and control the second contact to be connected to the common contact when the first voltage detection signal of the first detection terminal is less than the first threshold voltage. The common contact is connected; and the second control signal is output through the second output terminal to control the connection of the fourth contact and the third contact;

The controller is further configured to output a third control signal through the first output terminal to control the disconnection of the second contact from the common contact and control the first contact when the second voltage detection signal of the second detection terminal is less than the second threshold voltage. The point is connected with the common contact, and a fourth control signal is output through the second output terminal to control the fourth contact to be disconnected from the third contact.

Optionally, it also includes a controller, the controller includes a first detection end, a second detection end and an output end; the first switch includes a control end;

The first detection terminal is electrically connected to the first contact, the second detection terminal is electrically connected to the second contact, the output terminal is electrically connected to the control terminal of the first switch, and the controller is used to detect the first voltage at the first detection terminal. When the voltage is less than the first threshold value, the first control signal is output through the output terminal to control the disconnection of the first contact and the common contact, and the second contact is connected to the common contact;

The controller is also used for outputting a second control signal through the output terminal to control the connection between the first contact and the common contact, and the second contact and the common contact when the second voltage detection signal at the second detection terminal is less than the second threshold voltage. point disconnect;

Wherein, when the first contact is connected with the common contact, the third contact is disconnected from the fourth contact; when the second contact is connected with the common contact, the third contact is connected with the fourth contact.

Optionally, the arc extinguishing circuit includes an absorption circuit and a coupling negative voltage circuit; the absorption circuit and the coupling negative voltage circuit are connected in parallel.

In a second aspect, an embodiment of the present invention further provides an AC-DC switching power supply method, which is applied to any AC-DC switching power supply circuit in the above-mentioned first aspect, and the AC-DC switching power supply method includes:

When the AC power input terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be disconnected from the second terminal; and when the third terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be connected to the second terminal. .

Optionally, the AC-DC switching power supply circuit further includes a controller, and the controller includes a first detection terminal, a second detection terminal, a first output terminal and a second output terminal; both the first switch and the second switch include a control terminal. The first detection terminal is electrically connected to the first contact, the first output terminal is electrically connected to the control terminal of the first switch, the second detection terminal is electrically connected to the second contact, and the second output terminal is electrically connected to the control terminal of the second switch. The control terminal is electrically connected;

When the AC power input terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be disconnected from the second terminal; and when the third terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be connected to the second terminal. ,include:

When the first voltage detection signal of the first detection terminal is less than the first threshold voltage, the controller outputs a first control signal through the first output terminal to control the disconnection of the first contact and the common contact, and control the second contact to be connected to the common contact. contact connection; and outputting a second control signal through the second output terminal to control the connection between the fourth contact and the third contact;

When the second voltage detection signal of the second detection terminal is less than the second threshold voltage, the controller outputs a third control signal through the first output terminal to control the disconnection between the second contact and the common contact, and control the first contact and the common contact The contacts are connected, and a fourth control signal is output through the second output terminal to control the connection between the fourth contact and the third contact.

Optionally, the AC-DC switching power supply circuit further includes a controller, the controller includes a first detection terminal, a second detection terminal and an output terminal; the first switch includes a control terminal; the first detection terminal is electrically connected to the first contact, The second detection terminal is electrically connected to the second contact, and the output terminal is electrically connected to the control terminal of the first switch; the first switch and the second switch are mechanical linkage switches;

When the AC power input terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be disconnected from the second terminal; and when the third terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be connected to the second terminal. ,include:

When the first voltage detection signal of the first detection terminal is less than the first threshold voltage, the controller outputs a first control signal through the output terminal to control the disconnection of the first contact and the common contact, and the second contact is connected to the common contact ;

When the second voltage detection signal of the second detection terminal is less than the second threshold voltage, the controller outputs a second control signal through the output terminal to control the connection between the first contact and the common contact, and the second contact is disconnected from the common contact ;

Wherein, when the first contact is connected with the common contact, the third contact is disconnected from the fourth contact; when the second contact is connected with the common contact, the third contact is connected with the fourth contact.

In a third aspect, an embodiment of the present invention further provides an AC-DC power supply circuit breaker, including any AC-DC switching power supply circuit as described in the first aspect above.

In the AC-DC switching power supply circuit provided by the embodiment of the present invention, the input terminal of the AC power supply and the input terminal of the DC power supply are arranged to be connected to the same switching circuit. Through the switching circuit, when the control AC power input terminal and the first terminal of the power supply switch are turned on, the arc extinguishing circuit is controlled to be disconnected from the second terminal (connected to the power output terminal) of the power supply switch, so that the AC power input terminal is connected to the power supply switch. When the power supply is switched on, the DC power supply can be disconnected from the output terminal of the power supply, so as to realize the AC power supply when the power supply switch is closed; The four terminals are connected with the second terminal of the power supply switch, so that the DC power supply can be connected with the output terminal of the power supply, so that the DC power supply is realized when the power supply switch is closed. It solves the problems of cumbersome circuit and inefficiency of power supply caused by the need to set up a separate control circuit when providing AC and DC power to the load, that is, to set up two circuits of DC and AC power separately. The switching circuit provides convenient switching of AC and DC power to the load, which improves the power supply efficiency to the load and the reliability of the power supply.

Description of drawings

1 is a schematic structural diagram of an AC-DC switching power supply circuit according to an embodiment of the present invention;

2 is a schematic structural diagram of another AC-DC switching power supply circuit provided by an embodiment of the present invention;

3 is a schematic structural diagram of another AC-DC switching power supply circuit provided by an embodiment of the present invention;

4 is a schematic structural diagram of another AC-DC switching power supply circuit provided by an embodiment of the present invention;

FIG. 5 is a flowchart of an AC-DC switching power supply method according to an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

All of the AC-DC switching power supply circuits, AC-DC switching methods, and AC-DC power supply circuit breakers provided in the following embodiments of the present invention can be applied to power supply equipment according to actual needs for AC power supply and DC power supply. in any switching situation.

FIG. 1 is a schematic structural diagram of an AC/DC switching power supply circuit provided by an embodiment of the present invention. As shown in FIG. 1 , the AC/DC switching power supply circuit includes: a switching circuit 10, a power supply switch K, an arc extinguishing circuit 20, an AC power input Terminal A, DC power input terminal B and power output terminal C, power output terminal C is used to connect the load;

The power supply switch K includes a first end q1 and a second end q2, and the second end q2 is electrically connected to the power output end C;

The arc extinguishing circuit 20 includes a third end q3 and a fourth end q4, and the third end q3 is electrically connected to the DC power input end B;

The switching circuit 10 is respectively electrically connected with the AC power input terminal A, the first terminal q1, the second terminal q2, the third terminal q3 and the fourth terminal q4, and is used to control the conduction between the AC power input terminal A and the first terminal q1. The conduction state, the conduction state between the third terminal q3 and the first terminal q1, and the conduction state between the fourth terminal q4 and the second terminal q2; and the control AC power input terminal A and the first terminal q1 are turned on When the fourth end q4 and the second end q2 are controlled to be disconnected; and when the third end q3 and the first end q1 are controlled to be turned on, the fourth end q4 and the second end q2 are controlled to be turned on.

Specifically, the AC power input terminal A is used to input AC power to the AC-DC switching power supply circuit, and the DC power input terminal B is used to input DC power to the AC-DC switching power supply circuit.

When the AC power supply needs to be supplied to the load or the load cannot be supplied with power through the DC power input terminal B, the power supply switch K is closed, and the switching circuit 10 controls the connection between the AC power input terminal A and the first terminal q1 of the power supply switch K to turn on or off. The third terminal q3 of the arc circuit 20 is disconnected from the first terminal q1 of the power supply switch K, and the fourth terminal q4 of the arc extinguishing circuit 20 is disconnected from the second terminal q2 of the power supply switch K, or the switching circuit 10 is manually switched. action to make the connection between the AC power input terminal A and the first terminal q1 of the power supply switch K, the disconnection between the third terminal q3 of the arc extinguishing circuit 20 and the first terminal q1 of the power supply switch K, and the disconnection of the arc extinguishing circuit 20 The fourth terminal q4 is disconnected from the second terminal q2 of the power supply switch K. In this way, a path is formed between the AC power input terminal A, the power supply switch K and the power supply output terminal C, and the AC power supply provides AC power to the load through the AC power input terminal A and the power supply output terminal C.

When the DC power supply needs to be supplied to the load or the load cannot be powered through the AC power input terminal A, the power supply switch K is closed, and the switching circuit 10 controls the disconnection and arc extinguishing circuit between the AC power input terminal A and the first terminal q1 of the power supply switch K The conduction between the third terminal q3 of the 20 and the first terminal q1 of the power supply switch K and the conduction between the fourth terminal q4 of the arc extinguishing circuit 20 and the second terminal q2 of the power supply switch K, or the switching circuit 10 is artificially switched. action, so that the AC power input terminal A and the first terminal q1 of the power supply switch K are disconnected, the third terminal q3 of the arc-extinguishing circuit 20 and the first terminal q1 of the power supply switch K are connected, and the arc-extinguishing circuit 20 is connected. The connection between the fourth terminal q4 and the second terminal q2 of the power supply switch K is conducted. In this way, a path is formed between the DC power input terminal B, the power supply switch K and the power output terminal C, and the DC power supply provides the load with AC power through the DC power input terminal B and the power output terminal C.

Wherein, the power supply switch K may be a vacuum switch, and the control mode of the power supply switch K may be a remote control mode or manual manual operation control. When the switching circuit 10 controls the connection between the power supply switch K and the AC input terminal, or between the DC input terminal and the DC input terminal, an arc effect will be generated in the path where the DC power supply input terminal B is located. The power supply affects the power supply, and the arc extinguishing circuit 20 is provided to eliminate the arc effect and ensure the reliability of the DC power supply to supply power to the load. Optionally, the arc extinguishing circuit 20 includes an absorption circuit 21 and a coupling negative voltage circuit 22; the absorption circuit 21 and the coupling negative voltage circuit 22 are connected in parallel.

In the AC-DC switching power supply circuit provided by the embodiment of the present invention, the input terminal of the AC power supply and the input terminal of the DC power supply are arranged to be connected to the same switching circuit. When the switching circuit controls the conduction between the AC power input terminal and the first terminal of the power supply switch, it controls the disconnection between the arc extinguishing circuit and the second terminal of the power supply switch, so that when the AC power input terminal is connected with the power supply switch, the DC power supply and the power supply output When the power supply switch is closed, the AC power supply is realized; and when the third end of the control arc extinguishing circuit and the first end of the power supply switch are turned on, the fourth end of the arc extinguishing circuit and the second end of the power supply switch are controlled The terminal is turned on, so that the DC power supply and the output terminal of the power supply are connected, so as to realize the DC power supply when the power supply switch is closed. Accordingly, convenient switching is realized when the AC and DC power supplies are provided to the load through only one switching circuit, and the power supply efficiency to the load and the reliability of the power supply are improved.

Continuing to refer to FIG. 1 , optionally, the switching circuit 10 includes a first switching switch K1 and a second switching switch K2;

The first switch K1 includes a first contact t1, a second contact t2 and a common contact t, and the second switch K2 includes a third contact t3 and a fourth contact t4;

The first contact t1 is electrically connected to the input terminal A of the AC power supply, the second contact t2 is electrically connected to the third terminal q3 of the arc extinguishing circuit 20, and the common contact t is electrically connected to the first terminal q1 of the power supply switch; The point t3 is electrically connected to the fourth end q4 of the arc extinguishing circuit 20, and the fourth contact t4 is connected to the second end q2 of the power supply switch.

Specifically, when the load needs to be supplied with AC power or cannot supply power to the load through the DC power input terminal B, the power supply switch is closed to control the first contact t1 of the first switch K1 and the common contact of the first switch K1 t is turned on, the second contact t2 of the first switch K1 is controlled to be disconnected from the common contact t of the first switch K1, and the third contact t3 of the second switch K2 is controlled to be disconnected from the fourth contact t4 In this way, a path is formed between the AC power input terminal A, the power supply switch and the power supply output terminal C, and the AC power supply provides AC power for the load through the AC power input terminal A and the power supply output terminal C.

When it is necessary to provide DC power to the load or it is impossible to supply power to the load through the AC power input terminal A, the power supply switch is closed to control the second contact t2 of the first switch K1 and the common contact t of the first switch K1 to conduct , control the first contact t1 of the first switch K1 to be disconnected from the common contact t of the first switch K1, and control the third contact t3 and the fourth contact t4 of the second switch K2 to conduct. In this way, a path is formed between the DC power input terminal B, the power supply switch and the power supply output terminal C, and the DC power supply provides AC power for the load through the DC power supply input terminal B and the power supply output terminal C. At the same time, the arc extinguishing circuit 20 is also in this The circuit is connected, and the arc effect when the power switch is turned on or off is eliminated, so as to ensure the reliability of the DC power supply to the load.

Wherein, both the first switch K1 and the second switch K2 may be mechanical switches, for example, the first switch K1 may be an automatic switch including two contacts. In addition, the first switch K1 and the second switch K2 may be controlled by remote control, or the first switch K1 and the second switch K2 may be controlled by manual operation, or the When either of the AC power input and output terminals and the DC power input terminal B cannot supply power to the load normally, the first switch K1 and the second switch K2 automatically operate to realize automatic switching between the AC power input terminal A and the DC power input terminal B. Switch to ensure uninterrupted power supply to the load.

FIG. 2 is a schematic structural diagram of another AC-DC switching power supply circuit according to an embodiment of the present invention. As shown in FIG. 2 , optionally, the first switch K1 and the second switch K2 are mechanical linkage switches.

Specifically, the linkage between the first switch K1 and the second switch K2 can be set, so that when only one of the first switch K1 or the second switch K2 is controlled, the other is linked accordingly, so that the switching The control of the DC switching power supply circuit is further simplified, the delay caused by the asynchronous control of the two switching switches is reduced, and the power supply efficiency is further improved. Specifically, the linkage setting between the first switch K1 and the second switch K2 can be achieved by using a control program inside the circuit, or by using a mechanical and electrical connection in the circuit to achieve the linkage between the two switches.

FIG. 3 is a schematic structural diagram of another AC-DC switching power supply circuit provided by an embodiment of the present invention. As shown in FIG. 3 , optionally, the AC-DC switching power supply circuit further includes a controller 30, and the controller 30 includes a first detection terminal m1, the second detection terminal m2, the first output terminal r1 and the second output terminal r2; the first switch K1 and the second switch K2 both include control terminals;

The first detection terminal m1 is electrically connected to the first contact t1, the first output terminal r1 is electrically connected to the control terminal of the first switch K1, the second detection terminal m2 is electrically connected to the second contact t2, and the second output terminal r2 It is electrically connected to the control terminal of the second switch K2.

The controller 30 is configured to output a first control signal through the first output terminal r1 to control the disconnection between the first contact t1 and the common contact t when the first voltage detection signal of the first detection terminal m1 is less than the first threshold voltage , control the second contact t2 to connect with the common contact t; and output the second control signal through the second output terminal r2 to control the fourth contact t4 to connect with the third contact t3;

The controller 30 is further configured to output a third control signal through the first output terminal r1 to control the disconnection between the second contact t2 and the common contact t when the second voltage detection signal at the second detection terminal m2 is less than the second threshold voltage. open, the first contact t1 is controlled to be connected with the common contact t, and the fourth control signal is output through the second output terminal r2 to control the fourth contact t4 to be disconnected from the third contact t3.

Specifically, referring to FIG. 2 , in the case where the first switch K1 and the second switch K2 are not set in linkage. When the controller 30 detects through its first detection terminal m1 that the first voltage detection signal at the first contact t1 of the first switch K1 is smaller than the first threshold voltage, it indicates that the AC power input terminal A cannot normally supply the load at this time. Provide AC power, the controller 30 outputs a first control signal through the first output terminal r1 to control the first contact t1 to be disconnected from the common contact t, the second contact t2 to be connected to the common contact t, and the second output The terminal r2 outputs a second control signal to control the connection between the fourth contact t4 of the second switch K2 and the third contact t3 to provide DC power to the load through the DC power input terminal B to ensure uninterrupted power supply to the load.

When the controller 30 detects through its second detection terminal m2 that the second voltage signal at the second contact t2 of the first switch K1 is smaller than the second threshold voltage, it indicates that the DC power input terminal B cannot provide the load normally at this time. DC power supply, the controller 30 outputs a third control signal through the first output terminal r1 to control the disconnection of the second contact t2 and the common contact t, control the connection between the first contact t1 and the common contact t, and through the second output The terminal r2 outputs a fourth control signal to control the fourth contact t4 of the second switch K2 to disconnect from the third contact t3, so as to provide DC power to the load through the AC power input terminal A to ensure uninterrupted power supply to the load.

The first threshold voltage and the second threshold voltage may be preset in the controller 30. For example, the first threshold voltage or the second threshold voltage may be set to zero volts or close to zero volts, indicating that the first switching switch K1 at this time A contact t1 or a second contact t2 has almost no voltage and cannot supply power to the load normally. The first control signal, the second control signal, the third control signal and the fourth control signal may be serial port command control signals, or may be valid high and low level signals.

The AC-DC switching circuit provided by the embodiment of the present invention is provided with a first switching switch and a second switching switch to conveniently switch the AC power input terminal and the DC power input terminal in the same circuit, and a controller is provided. Detect the voltage at the first contact and the second contact of the first switch, and output the corresponding control signal in time according to the detection result to control the first switch and the second switch, so as to efficiently control the AC power input and the DC Flexible switching between input terminals ensures efficient and reliable power supply to the load and uninterrupted power supply.

FIG. 4 is a schematic structural diagram of another AC-DC switching power supply circuit provided by an embodiment of the present invention. As shown in FIG. 4 , optionally, the AC-DC switching power supply circuit further includes a controller 30, and the controller 30 includes a first detection terminal m1, a second detection terminal m2 and an output terminal r; the first switch K1 includes a control terminal;

The first detection terminal m1 is electrically connected to the first contact t1, the second detection terminal m2 is electrically connected to the second contact t2, and the output terminal r is electrically connected to the control terminal of the first switch K1. When the first voltage detection signal of a detection terminal m1 is less than the first threshold voltage, a first control signal is output through the output terminal r to control the disconnection between the first contact t1 and the common contact t, and the second contact t2 and the common contact point t connection;

The controller 30 is further configured to output a second control signal through the output terminal r to control the connection between the first contact t1 and the common contact t when the second voltage detection signal at the second detection terminal m2 is less than the second threshold voltage, and the first The two contacts t2 are disconnected from the common contact t;

Wherein, when the first contact t1 is connected with the common contact t, the third contact t3 is disconnected from the fourth contact t4; when the second contact t2 is connected with the common contact t, the third contact t3 is connected with the fourth contact Contact t4 is connected.

Specifically, referring to FIG. 3 , in the case where the first switch K1 and the second switch K2 are set in linkage. After the controller 30 detects the voltage at the first contact t1 or the second contact t2 of the first switch K1 through the first detection terminal m1 or the second detection terminal m2, it can output the corresponding first contact through only one output terminal r. A control signal or a second control signal to control the switching of the circuit where the AC power input terminal A is located and the path where the DC power supply input terminal B is located, ensuring that the load is powered off without interruption, reducing the possible asynchronous problems in separate control, and improving switching Speed, efficient power supply.

Based on the above technical solution of the AC-DC switching power supply circuit, the embodiment of the present invention further provides an AC-DC power supply circuit breaker, the AC-DC power supply circuit breaker includes any of the AC-DC switching power supply circuits in any of the above technical solutions, and thus can It achieves the same technical effect as the corresponding AC-DC switching power supply circuit, realizes the convenient switching of the AC power supply and the DC power supply through only one switching circuit, and improves the power supply efficiency to the load and the reliability of the power supply. It avoids that when supplying power to loads such as electrical equipment in the prior art, an AC circuit breaker and a DC circuit breaker need to be set up to switch the AC power supply and the DC power supply. The final circuit design is complicated and complicated, and the embodiment of the present invention provides a switching function. It only needs one circuit breaker to switch the AC power supply and the DC power supply to the power supply equipment, which is simple and reliable, the power supply is efficient, and the cost is low.

An embodiment of the present invention further provides an AC-DC switching power supply method, which is applied to the AC-DC switching power supply circuit provided in any of the above-mentioned embodiments. FIG. 5 is a flowchart of an AC-DC switching power supply method provided by an embodiment of the present invention, as shown in FIG. 5, the AC-DC switching power supply method includes:

S100, when the AC power input terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be disconnected from the second terminal; and when the third terminal is controlled to be connected to the first terminal, the fourth terminal is controlled to be connected to the second terminal. on.

Specifically, referring to FIG. 1 , when AC power needs to be provided to the load or the load cannot be powered through the DC power input terminal B, the power supply switch is closed to control the conduction between the AC power input terminal A and the first terminal q1 of the power supply switch K. The connection between the third end q3 of the arc extinguishing circuit 20 and the first end q1 of the power supply switch K is disconnected, and the fourth end q4 of the arc extinguishing circuit 20 and the second end q2 of the power supply switch K are disconnected. In this way, a path is formed between the AC power input terminal A, the power supply switch K and the power supply output terminal C, and the AC power supply provides AC power to the load through the AC power input terminal K and the power supply output terminal C.

When it is necessary to provide DC power to the load or the load cannot be powered through the AC power input terminal A, the power supply switch K is closed to control the disconnection between the AC power input terminal A and the first terminal q1 of the power supply switch K, and the first terminal q1 of the arc extinguishing circuit 20 is controlled. The connection between the third terminal q3 and the first terminal q1 of the power supply switch K and the conduction between the fourth terminal q4 of the arc extinguishing circuit 20 and the second terminal q2 of the power supply switch K are conducted. In this way, a path is formed between the DC power input terminal B, the power supply switch K and the power output terminal C, and the DC power supply provides the load with AC power through the DC power input terminal B and the power output terminal C.

Referring to FIG. 3 , optionally, the AC/DC switching power supply circuit further includes a controller 30, and the controller 30 includes a first detection terminal m1, a second detection terminal m2, a first output terminal r1 and a second output terminal r2; The switch K1 and the second switch K2 both include control terminals; the first detection terminal m1 is electrically connected to the first contact t1, the first output terminal r1 is electrically connected to the control terminal of the first switch K1, and the second detection terminal m2 is electrically connected to the second contact t2, and the second output terminal r2 is electrically connected to the control terminal of the second switch K2;

When the AC power input terminal is controlled to be turned on with the first terminal q1, the fourth terminal q4 is controlled to be disconnected from the second terminal q2; and when the third terminal q3 is controlled to be turned on with the first terminal q1, the fourth terminal q4 is controlled Conduction with the second terminal q2, including:

When the first voltage detection signal of the first detection terminal m1 is smaller than the first threshold voltage, the controller 30 outputs a first control signal through the first output terminal r1 to control the disconnection between the first contact t1 and the common contact t, and control the The second contact t2 is connected with the common contact t; and the second control signal is output through the second output terminal r2 to control the connection between the fourth contact t4 and the third contact t3;

When the second voltage detection signal of the second detection terminal m2 is smaller than the second threshold voltage, the controller 30 outputs a third control signal through the first output terminal r1 to control the disconnection between the second contact t2 and the common contact t, and control the The first contact t1 is connected with the common contact t, and a fourth control signal is output through the second output terminal r2 to control the fourth contact t4 to be connected with the third contact t3.

Referring to FIG. 4, optionally, the AC-DC switching power supply circuit further includes a controller 30, the controller 30 includes a first detection terminal m1, a second detection terminal m2 and an output terminal r; the first switch K1 includes a control terminal; A detection terminal m1 is electrically connected to the first contact t1, the second detection terminal m2 is electrically connected to the second contact t2, and the output terminal r is electrically connected to the control terminal of the first switch K1; the first switch K1 and the second switch K1 are electrically connected to The switch K2 is a mechanical linkage switch;

When the AC power input terminal is controlled to be turned on with the first terminal q1, the fourth terminal q4 is controlled to be disconnected from the second terminal q2; and when the third terminal q3 is controlled to be turned on with the first terminal q1, the fourth terminal q4 is controlled Conduction with the second terminal q2, including:

When the first voltage detection signal of the first detection terminal m1 is less than the first threshold voltage, the controller 30 outputs a first control signal through the output terminal r to control the disconnection of the first contact t1 and the common contact t, and the second contact The point t2 is connected with the common contact t;

When the second voltage detection signal of the second detection terminal m2 is smaller than the second threshold voltage, the controller 30 outputs a second control signal r through the output terminal to control the connection between the first contact t1 and the common contact t, and the second contact t2 is disconnected from the common contact t;

Wherein, when the first contact t1 is connected with the common contact t, the third contact t3 is disconnected from the fourth contact t4; when the second contact t2 is connected with the common contact t, the third contact t3 is connected with the fourth contact Contact t4 is connected.

To sum up, the AC-DC switching power supply method provided by the embodiment of the present invention can be applied to any AC-DC switching power supply circuit as in the above-mentioned embodiment, and can achieve the same technical effect as the AC-DC switching power supply circuit, and solve the problem of the current situation. Some control circuits need to be set up separately when providing AC and DC power to the load, that is, the circuit is cumbersome and the power supply is inefficient due to the separate setting of two DC and AC power circuits. The convenient switching between AC and DC power supplies improves the power supply efficiency to the load and the reliability of the power supply.

Note that the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

1. An AC/DC switching power supply circuit, comprising: the arc extinguishing device comprises a switching circuit, a power supply switch, an arc extinguishing circuit, an alternating current power supply input end, a direct current power supply input end and a power supply output end, wherein the power supply output end is used for being connected with a load;

the power supply switch comprises a first end and a second end, and the second end is electrically connected with the power supply output end;

the arc extinguishing circuit comprises a third end and a fourth end, and the third end is electrically connected with the input end of the direct current power supply;

the switching circuit is electrically connected with the alternating current power supply input end, the first end, the second end, the third end and the fourth end respectively, and is used for controlling the conduction state between the alternating current power supply input end and the first end, the conduction state between the third end and the first end and the conduction state between the fourth end and the second end; when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when the third end is controlled to be conducted with the first end, the fourth end is controlled to be conducted with the second end.

2. The ac-dc switched-supply circuit according to claim 1, wherein the switching circuit comprises a first switch and a second switch;

the first change-over switch comprises a first contact, a second contact and a common contact, and the second change-over switch comprises a third contact and a fourth contact;

the first contact is electrically connected with the input end of the alternating current power supply, the second contact is electrically connected with the third end of the arc extinguishing circuit, and the common contact is electrically connected with the first end of the power supply switch; the third contact is electrically connected with the fourth end of the arc extinguishing circuit, and the fourth contact is connected with the second end of the power supply switch.

3. The ac-dc switching power supply circuit according to claim 2, wherein the first switch and the second switch are mechanical ganged switches.

4. The ac-dc switching power supply circuit according to claim 2, further comprising a controller, wherein the controller comprises a first detection terminal, a second detection terminal, a first output terminal, and a second output terminal; the first change-over switch and the second change-over switch comprise control ends;

the first detection end is electrically connected with the first contact, the first output end is electrically connected with the control end of the first change-over switch, the second detection end is electrically connected with the second contact, and the second output end is electrically connected with the control end of the second change-over switch.

The controller is used for outputting a first control signal through the first output end to control the disconnection of the first contact and the common contact and control the connection of the second contact and the common contact when a first voltage detection signal of the first detection end is smaller than a first threshold voltage; and outputting a second control signal through the second output terminal to control the fourth contact to be connected with the third contact;

the controller is further configured to output a third control signal through the first output terminal to control the second contact to be disconnected from the common contact, control the first contact to be connected to the common contact, and output a fourth control signal through the second output terminal to control the fourth contact to be disconnected from the third contact when a second voltage detection signal of the second detection terminal is smaller than a second threshold voltage.

5. The AC-DC switching power supply circuit according to claim 3, further comprising a controller, wherein the controller comprises a first detection terminal, a second detection terminal and an output terminal; the first switch comprises a control end;

the first detection end is electrically connected with the first contact, the second detection end is electrically connected with the second contact, the output end is electrically connected with the control end of the first change-over switch, the controller is used for outputting a first control signal through the output end to control the disconnection of the first contact and the common contact when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, and the second contact is connected with the common contact;

the controller is further configured to output a second control signal through the output terminal to control connection between the first contact and the common contact when a second voltage detection signal of the second detection terminal is smaller than a second threshold voltage, and the second contact is disconnected from the common contact;

wherein the third contact is disconnected from the fourth contact when the first contact is connected to the common contact; and when the second contact is connected with the common contact, the third contact is connected with the fourth contact.

6. The switched supply circuit of claim 1, wherein the arc quenching circuit comprises an absorption circuit and a coupled negative circuit; the absorption circuit and the coupling negative voltage circuit are connected in parallel.

7. An ac/dc switching power supply method applied to the ac/dc switching power supply circuit according to any one of claims 1 to 6, the ac/dc switching power supply method comprising:

when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when the third end is controlled to be conducted with the first end, the fourth end is controlled to be conducted with the second end.

8. The ac-dc switching power supply method according to claim 7, wherein the ac-dc switching power supply circuit further comprises a controller, the controller comprising a first detection terminal, a second detection terminal, a first output terminal, and a second output terminal; the first change-over switch and the second change-over switch comprise control ends; the first detection end is electrically connected with the first contact, the first output end is electrically connected with the control end of the first change-over switch, the second detection end is electrically connected with the second contact, and the second output end is electrically connected with the control end of the second change-over switch;

when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when controlling the third terminal to be conducted with the first terminal, controlling the fourth terminal to be conducted with the second terminal, including:

when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, the controller outputs a first control signal through the first output end to control the disconnection of the first contact and the common contact and control the connection of the second contact and the common contact; and outputting a second control signal through the second output terminal to control the fourth contact to be connected with the third contact;

when a second voltage detection signal of the second detection end is smaller than a second threshold voltage, the controller outputs a third control signal through the first output end to control the disconnection of the second contact and the common contact, control the connection of the first contact and the common contact, and outputs a fourth control signal through the second output end to control the connection of the fourth contact and the third contact.

9. The ac-dc switching power supply method according to claim 7, wherein the ac-dc switching power supply circuit further comprises a controller, the controller comprising a first detection terminal, a second detection terminal, and an output terminal; the first switch comprises a control end; the first detection end is electrically connected with the first contact, the second detection end is electrically connected with the second contact, and the output end is electrically connected with the control end of the first change-over switch; the first change-over switch and the second change-over switch are mechanical linkage switches;

when the input end of the alternating current power supply is controlled to be connected with the first end, the fourth end and the second end are controlled to be disconnected; and when controlling the third terminal to be conducted with the first terminal, controlling the fourth terminal to be conducted with the second terminal, including:

when a first voltage detection signal of the first detection end is smaller than a first threshold voltage, the controller outputs a first control signal through the output end to control the disconnection of the first contact and the common contact, and the second contact is connected with the common contact;

when a second voltage detection signal of the second detection end is smaller than a second threshold voltage, the controller outputs a second control signal through the output end to control the connection between the first contact and the common contact, and the second contact is disconnected with the common contact;

wherein the third contact is disconnected from the fourth contact when the first contact is connected to the common contact; and when the second contact is connected with the common contact, the third contact is connected with the fourth contact.

10. A circuit breaker for AC/DC power supply, comprising a circuit for AC/DC switched power supply according to any one of claims 1 to 6.

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