Power conversion circuit and socket

Abstract

The utility model provides a power conversion circuit and a socket, and belongs to the technical field of power supplies. According to the power conversion circuit, the multiplexed DC voltage output by the AC-DC conversion circuit is used as the input voltage provided by the DC-DC conversion circuit, and is also multiplexed for supplying power to the relay opening and closing circuit, so that an AC-DC conversion circuit does not need to be additionally arranged for supplying power to the relay opening and closing circuit. Therefore, the power conversion circuit provided by the embodiment of the utility model is simple in structure, low in preparation cost, relatively low in heat productivity, and beneficial to long-time use of the power conversion circuit.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a power conversion circuit and a socket. Background Art

[0002] In order to meet the needs of multiple electronic devices to use electricity at the same time, existing power strips usually add a DC charging port (such as a USB charging port). However, due to the addition of a DC charging module inside the power strip, the distance between the AC charging ports on the power strip is relatively close, which poses a potential safety hazard to electricity use. For this reason, existing power strips usually add a relay between the AC input and AC output terminals of the power strip. If an abnormality occurs at the AC output terminal, the relay can disconnect the connection between the AC input and AC output terminals to improve electricity safety.

[0003] However, in the existing power strips, the addition of relays also requires the corresponding addition of power supply modules and control modules for the relays, which not only increases the manufacturing cost of the power strips, but also increases the heat generated during use of the power strips, which is not conducive to long-term use of the power strips.

[0004] The above description is merely the technology known to the inventor of the present application and does not constitute the prior art of the present application simply because it appears in the background technology. Utility Model Content

[0005] In order to solve the existing technical problems, the present application provides a power conversion circuit and a socket with low manufacturing cost and low heat generation.

[0006] A power conversion circuit comprises an AC input terminal, an AC output terminal, a DC output terminal, a relay opening and closing circuit, an AC-DC conversion circuit and a DC-DC conversion circuit;

[0007] The AC input terminal is connected to the AC output terminal through the relay opening and closing circuit;

[0008] The AC-DC conversion circuit is connected to the relay opening and closing circuit and the DC-DC conversion circuit respectively, and is used to convert the AC voltage input through the AC input terminal into a multiplexed DC voltage to serve as the input voltage of the DC-DC conversion circuit and to be multiplexed to power the relay opening and closing circuit;

[0009] The DC-DC conversion circuit is connected to the DC output terminal, and is used to convert the multiplexed DC voltage into a target DC voltage, and output it via the DC output terminal.

[0010] Optionally, the number of the DC output terminals is multiple, and the power conversion circuit further includes an MCU connected to the relay opening and closing circuit;

[0011] The DC-DC conversion circuit is connected to the plurality of DC output terminals respectively, and the MCU is connected to the DC-DC conversion circuit, and is used to distribute the output power of the plurality of DC output terminals, and is reused to control the switch state of the relay opening and closing circuit; or;

[0012] The AC-DC conversion circuit and the DC-DC conversion circuit are respectively connected to corresponding DC output terminals among the multiple DC output terminals, and the MCU is respectively connected to the AC-DC conversion circuit and the DC-DC conversion circuit, and is used to distribute the output power of the multiple DC output terminals and is reused to control the switching state of the relay opening and closing circuit.

[0013] Optionally, the power conversion circuit further includes a current sensor connected to the AC output terminal and the MCU respectively;

[0014] The current sensor is used to collect the output current of the AC output end and send the output current to the MCU;

[0015] The MCU controls the opening and closing state of the relay opening and closing circuit according to the output current.

[0016] Optionally, the power conversion circuit further includes a power switch key connected to the MCU, and the MCU is further used to control the opening and closing state of the relay opening and closing circuit according to the state of the power switch key.

[0017] Optionally, the relay opening and closing circuit includes a relay connected between the AC input terminal and the AC output terminal, and a drive circuit and a power supply circuit respectively connected to the relay;

[0018] When the relay is in an open state, the electrical connection path between the AC input terminal and the AC output terminal is disconnected, and when the relay is in a closed state, the electrical connection path between the AC input terminal and the AC output terminal is connected;

[0019] The driving circuit is connected to the MCU and is used to drive the opening and closing state of the relay;

[0020] The power supply circuit is connected to the AC-DC conversion circuit and is used to convert the multiplexed DC voltage into a power supply voltage for the relay.

[0021] Optionally, the power conversion circuit also includes a relay opening and closing indicator light circuit connected to the MCU, and the relay opening and closing indicator light circuit is used to indicate the opening and closing state of the relay opening and closing circuit.

[0022] Optionally, the power supply circuit is also connected to the relay opening and closing indicator light circuit to supply power to the relay opening and closing indicator light circuit.

[0023] Optionally, the DC output terminal includes a first DC output terminal and a second DC output terminal, and the DC-DC conversion circuit includes a first DC-DC converter connected to the first DC output terminal and a second DC-DC converter connected to the second DC output terminal;

[0024] The first DC-DC converter is used to convert the multiplexed DC voltage into a first target DC voltage and output it via the first DC output terminal;

[0025] The second DC-DC converter is used to convert the multiplexed DC voltage into a second target DC voltage and output it via the second DC output terminal.

[0026] Optionally, at least one of the first DC-DC converter and the second DC-DC converter is a synchronous step-down DC-DC converter; and / or,

[0027] At least one of the first DC output terminal and the second DC output terminal includes a plurality of charging interface circuits and a plurality of output switch circuits;

[0028] Each of the charging interface circuits is connected to a corresponding target DC voltage output terminal through each of the output switch circuits. When the output switch circuit is turned on, the corresponding charging interface circuit outputs a corresponding target DC voltage.

[0029] A socket, comprising a housing, a plug connected to the housing, an AC charging port and a DC charging port provided on the housing, and a circuit board provided in the housing, wherein the circuit board is provided with any one of the power conversion circuits described above;

[0030] The AC input end is connected to the plug, the AC output end is connected to the AC charging port, and the DC output end is connected to the DC charging port.

[0031] The power conversion circuit provided in the embodiment of the present application uses the reused DC voltage output by the AC-DC conversion circuit as the input voltage for the DC-DC conversion circuit, and is also reused to power the relay opening and closing circuit, so there is no need to set up an additional AC-DC conversion circuit to power the relay opening and closing circuit. Therefore, the power conversion circuit provided in the embodiment of the present application has a simple structure, low preparation cost, and relatively low heat generation, which is conducive to the long-term use of the power conversion circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are only used to illustrate the embodiments and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings. In the accompanying drawings:

[0033] Figure 1 A structural block diagram of a power conversion circuit provided according to some embodiments of the present application;

[0034] Figure 2 A structural block diagram of a power conversion circuit provided in another embodiment of the present application;

[0035] Figure 3 A schematic diagram of an achievable circuit structure of a first DC-DC converter and a corresponding first DC output terminal in a power conversion circuit provided in some embodiments of the present application;

[0036] Figure 4 A schematic diagram of an achievable circuit structure of a second DC-DC converter and a corresponding second DC output terminal in a power conversion circuit provided in some embodiments of the present application;

[0037] Figure 5 A schematic diagram of an achievable circuit structure of a power conversion circuit provided in some embodiments of the present application;

[0038] Figure 6 A schematic diagram of an achievable circuit structure of a power supply circuit in a power conversion circuit provided according to some embodiments of the present application;

[0039] Figure 7 A schematic diagram of the appearance of a socket provided according to some embodiments of the present application;

[0040] Figure 8 This is a schematic diagram of the internal structure of a socket after the shell is disassembled according to some embodiments of the present application. DETAILED DESCRIPTION

[0041] The technical solution of the present application is further elaborated in detail below in conjunction with the accompanying drawings and specific embodiments of the specification.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the implementation of this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0043] See also Figure 1As shown, it is a structural block diagram of a power conversion circuit provided according to some embodiments of the present application. The power conversion circuit provided in some embodiments of the present application can be used in a power converter that can provide both AC charging and DC charging for electrical equipment, wherein the power converter can be specifically a socket, such as a fixed socket or a movable socket. The movable socket can further be a multi-position socket with a power cord and a plug that can be moved, that is, a power strip. In some embodiments, the power conversion circuit provided in the present application specifically includes an AC input terminal 1, an AC output terminal 2, a DC output terminal 3, a relay opening and closing circuit 4, an AC-DC conversion circuit 5, and a DC-DC conversion circuit 6. The AC input terminal 1 is connected to the AC output terminal 3 through the relay opening and closing circuit 4. The AC-DC conversion circuit 5 is respectively connected to the relay opening and closing circuit 4 and the DC-DC conversion circuit 6, and is used to convert the AC voltage input 1 via the AC input terminal into a multiplexed DC voltage, as the input voltage of the DC-DC conversion circuit 6 and reused to power the relay opening and closing circuit 4. The DC-DC conversion circuit 6 is connected to the DC output terminal 3 , and is used for converting the multiplexed DC voltage into a target DC voltage, and outputting it via the DC output terminal 3 .

[0044] The AC input terminal 1, the AC output terminal 2, and the DC output terminal 3 are not limited to wiring terminals, for example, the AC input terminal 1 may include an AC input circuit, the AC output terminal 2 may include an AC output circuit, and the DC output terminal may include a DC output circuit. The AC input circuit may be an AC input protection circuit such as a lightning protection circuit, the AC output circuit may be an AC output detection circuit, and the DC output circuit may be a DC output interface circuit.

[0045] The AC input terminal 1 is used to receive an externally input AC voltage (such as 220V AC mains electricity). The electrical connection path between the AC input terminal 1 and the AC output terminal 2 is conductive. When the relay opening and closing circuit 4 is in a closed state, the AC voltage is input to the AC output terminal 2 via the relay opening and closing circuit 4, and is output via the AC output terminal 2 to provide an AC power supply voltage for the electrical equipment. When the relay opening and closing circuit 4 is in an open state, the electrical connection path between the AC input terminal 1 and the AC output terminal 2 is disconnected. In some embodiments, the AC output terminal 2 may include a plurality of AC output ports. When the AC output port is electrically connected to an external electrical equipment, the AC voltage provides AC power to the electrical equipment via the AC output port.

[0046] The power conversion circuit provided in the embodiment of the present application uses the reused DC voltage output by the AC-DC (alternating current to direct current) conversion circuit 5 as the input voltage for the DC-DC (direct current to direct current) conversion circuit 6, and is also reused to power the relay opening and closing circuit 4, so that there is no need to set up an additional AC-DC conversion circuit 5 to power the relay opening and closing circuit 4. Therefore, the power conversion circuit provided in the embodiment of the present application has a simple structure, low preparation cost, and relatively low heat generation, which is conducive to the long-term use of the power conversion circuit.

[0047] Specifically, the number of DC output terminals in the power conversion circuit provided by the present application is multiple, and the power conversion circuit further includes an MCU for allocating the output power of multiple DC output terminals. Therefore, the power conversion circuit provided in the embodiment of the present application can provide DC charging or DC power supply of different powers for electrical equipment. Furthermore, in the power conversion circuit provided by the present application, the MCU for allocating the output power of multiple DC output terminals is also connected to the relay opening and closing circuit 4 to be reused to control the opening and closing state of the relay opening and closing circuit 4. Therefore, the structure of the power conversion circuit provided in the embodiment of the present application is simplified, the preparation cost is further reduced, and it has a lower heat generation, which is conducive to the long-term use of the power conversion circuit.

[0048] In some embodiments, the DC voltage output by the multiple DC output terminals can all be provided by the DC-DC conversion circuit 6, and the DC-DC conversion circuit 6 is respectively connected to the multiple DC output terminals to provide a corresponding DC voltage to each DC output terminal. The MCU for distributing the output power of the multiple DC output terminals is connected to the DC-DC conversion circuit 6, and is used to control the DC-DC conversion circuit 6 to output a corresponding DC voltage to each DC output terminal, so that each DC output terminal can output a DC power of the corresponding output power to charge or supply power to the electrical equipment. Specifically, the DC-DC conversion circuit 6 can further include a plurality of DC-DC converters, each of which is connected to the above-mentioned MCU and to a corresponding DC output terminal, so as to output a corresponding DC voltage to the corresponding DC output terminal under the control of the above-mentioned MCU.

[0049] In other embodiments, the DC voltage output by the multiple DC output terminals can be provided by the AC-DC conversion circuit 5 and the DC-DC conversion circuit 6, and the AC-DC conversion circuit 5 and the DC-DC conversion circuit 6 are respectively connected to the corresponding DC output terminals of the multiple DC output terminals to provide the corresponding DC voltage to each DC output terminal. The MCU used to distribute the output power of the multiple DC output terminals is respectively connected to the AC-DC conversion circuit 5 and the DC-DC conversion circuit 6, and is used to control the AC-DC conversion circuit 5 and the DC-DC conversion circuit 6 to output the corresponding DC voltage to the corresponding DC output terminal, so that each DC output terminal can output the DC power of the corresponding output power to charge or supply power to the electrical equipment. Specifically, the number of DC output terminals connected to the DC-DC conversion circuit 6 can be one or more, and the DC-DC conversion circuit 6 can further include one or more DC-DC converters, each of which is connected to the above-mentioned MCU and to a corresponding DC output terminal, so as to output the corresponding DC voltage to the corresponding DC output terminal under the control of the above-mentioned MCU.

[0050] See also Figure 2 As shown, it is a structural block diagram of a power conversion circuit provided in another embodiment of the present application. In other embodiments, the DC output terminal 3 connected to the DC-DC conversion circuit 6 includes a first DC output terminal 31 and a second DC output terminal 32. The DC-DC conversion circuit 6 includes a first DC-DC converter 61 connected to the first DC output terminal 31 and a second DC-DC converter 62 connected to the second DC output terminal 32. The first DC-DC converter 61 is used to convert the multiplexed DC voltage into a first target DC voltage and output it via the first DC output terminal 31. The second DC-DC converter 62 is used to convert the multiplexed DC voltage into a second target DC voltage and output it via the second DC output terminal 32.

[0051] The first DC-DC converter 61 and the second DC-DC converter 62 can be synchronous step-down DC-DC converters to convert the multiplexed DC voltage into different target DC voltages to provide DC power supply for the electrical equipment. Specifically, the first DC output terminal 31 and the second DC output terminal 32 are DC output terminals for outputting different target DC voltages, and the first DC output terminal 31 and the second DC output terminal 32 can further include multiple charging interface circuits and multiple output switch circuits. Each charging interface circuit is connected to the corresponding target DC voltage output terminal through each output switch circuit, and when the output switch circuit is turned on, the corresponding charging interface circuit outputs the corresponding target DC voltage (first target DC voltage or second target DC voltage). That is, the charging interface circuit for outputting the first target DC voltage and the charging interface circuit for outputting the second target DC voltage can include multiple, and each charging interface circuit is used to connect to a DC charging interface. When the electrical equipment is connected to one of the DC charging interfaces, the corresponding target DC voltage is output via the charging interface circuit connected to the DC charging port, and is input to the electrical equipment via the DC charging port to provide DC charging for the electrical equipment. The power conversion circuit provided in the embodiment of the present application can not only provide AC power supply for the power-consuming device, but also output different target DC voltage outputs through the charging interface circuit to provide DC power supply for power-consuming devices with different power requirements, and each target DC voltage can be output by multiple charging interface circuits, so that multiple power-consuming devices with the same power supply requirements can be powered at the same time, which can meet the needs of different application scenarios. It should be noted that in the present application, charging the battery in the power-consuming device or directly supplying power to the power-consuming device is referred to as charging the power-consuming device.

[0052] See also Figure 3As shown, it is a schematic diagram of a circuit structure that can be realized in the first DC-DC converter 61 and the corresponding first DC output terminal 31 in the power conversion circuit provided in some embodiments of the present application. In some embodiments, the first DC-DC converter 61 includes a first synchronous buck conversion chip 611 and a first power stage circuit 612. The first power stage circuit 612 includes a main power switch tube Q11, a synchronous rectifier switch tube Q12, an energy storage inductor L11 and a capacitor C11. The current input end of the main power switch tube Q11 is connected to the output end of the AC-DC conversion circuit 5 for receiving the multiplexed DC voltage VCP. The current output end of the main power switch tube Q11 is connected to the current input end of the synchronous rectifier tube Q12, and the current output end of the synchronous rectifier tube Q12 is grounded. The first end of the energy storage inductor L11 is connected to the current output end of the main power switch tube Q11, and the second end of the energy storage inductor L11 and the first end of the capacitor C11 are connected to the first target DC voltage output end of the first DC-DC converter 61. The second end of the capacitor C11 is grounded. The synchronous buck conversion chip 611 includes a first voltage input terminal connected to the output terminal of the AC-DC conversion circuit 5, and is used to receive the multiplexed DC voltage ACP. The first synchronous buck conversion chip 611 also includes a first gate control terminal connected to the switch control terminal of the main power switch tube Q11 and a second gate control terminal connected to the synchronous rectification switch tube Q12, and the first gate control terminal and the second gate control terminal are respectively used to output the switch control signal DG11 of the main power switch tube Q11 and the switch control signal DG12 of the synchronous rectification switch tube Q12. In addition, the first main power stage circuit 612 also includes an RC circuit connected between the end of the energy storage inductor L11 and the ground terminal, and the RC circuit is formed by a resistor R11 and a capacitor C12 connected in series. The main power switch tube Q11 and the synchronous rectification switch tube Q12 can be enhanced NMOS tubes respectively.

[0053] The first DC output terminal 31 includes a first output switch circuit 311 and a first charging interface circuit 312. The first output switch circuit 311 is connected between the first target DC voltage output of the first DC-DC converter 61 and the first charging interface circuit 312. When the first charging interface circuit 312 is connected to the power-consuming device, the first output switch circuit 311 is turned on, and the first target DC voltage output by the first DC-DC converter 61 charges the power-consuming device via the first charging interface circuit 312. Specifically, the first output switch circuit 311 includes an output switch tube Q13 and a capacitor C13. The current input end of the output switch tube Q13 is connected to the first target DC voltage output end of the first DC-DC converter 61, the current output and the first end of the capacitor C13 are connected to one end of the first charging interface circuit 312, and the second end of the capacitor C13 is grounded. The first charging interface circuit 312 can be a USB interface circuit, a type-c interface circuit or a lightning interface circuit. The switch tube Q13 can be a single NMOS tube or one of the dual NMOS tubes.

[0054] The switch control terminal of the switch tube Q13 is connected to the third gate control terminal of the first synchronous buck conversion chip 611. The third gate control terminal of the first synchronous buck conversion chip 611 is used to output the switch control signal DG13 of the switch tube Q13. The first synchronous buck conversion chip 611 also includes a first detection terminal connected to the first end of the capacitor C13. The first synchronous buck conversion chip 611 determines whether the first charging interface circuit 312 is connected to the electrical device according to the voltage at the first end of the capacitor C13. If so, the switch tube Q13 is controlled to be turned on. The first synchronous buck conversion chip 611 can be a buck control chip with a built-in fast charging protocol, such as but not limited to the Zhirong SW3556 chip.

[0055] See also Figure 4As shown, it is a schematic diagram of a circuit structure that can be realized in the second DC-DC converter 62 and the corresponding second DC output terminal 32 in the power conversion circuit provided in some embodiments of the present application. In some embodiments, the second DC-DC converter 62 includes a second synchronous buck conversion chip 621 and a second power stage circuit 622. The second power stage circuit 622 includes a main power switch tube Q21, a synchronous rectifier switch tube Q22, an energy storage inductor L21 and a capacitor C21. The current input end of the main power switch tube Q21 is connected to the output end of the AC-DC conversion circuit 5 for receiving the multiplexed DC voltage VCP. The current output end of the main power switch tube Q21 is connected to the current input end of the synchronous rectifier tube Q22, and the current output end of the synchronous rectifier tube Q22 is grounded. The first end of the energy storage inductor L21 is connected to the current output end of the main power switch tube Q21, and the second end of the energy storage inductor L21 and the first end of the capacitor C21 are connected to the second target DC voltage output end of the second DC-DC converter 62. The second end of the capacitor C21 is grounded. The synchronous buck conversion chip 621 includes a second voltage input terminal connected to the output terminal of the AC-DC conversion circuit 5, and is used to receive the multiplexed DC voltage ACP. The second synchronous buck conversion chip 621 also includes a fourth gate control terminal connected to the switch control terminal of the main power switch tube Q21 and a fifth gate control terminal connected to the synchronous rectification switch tube Q22, and the fourth gate control terminal and the fifth gate control terminal are respectively used to output the switch control signal DG21 of the main power switch tube Q21 and the switch control signal DG22 of the synchronous rectification switch tube Q22. In addition, the second main power stage circuit 622 also includes an RC circuit connected between the end of the energy storage inductor L21 and the ground terminal, and the RC circuit is formed by a resistor R21 and a capacitor C22 connected in series. The main power switch tube Q21 and the synchronous rectification switch tube Q22 can be enhanced NMOS tubes.

[0056] The second DC output terminal 32 includes a second output switch circuit 321, a second charging interface circuit 322, a third output switch circuit 323 and a third charging interface circuit 324. The second output switch circuit 321 is connected between the second target DC voltage output of the second DC-DC converter 62 and the second charging interface circuit 322. The third output switch circuit 323 is connected between the second target DC voltage output of the second DC-DC converter 62 and the third charging interface circuit 324. When the second charging interface circuit 322 is connected to the power-consuming device, the second output switch circuit 321 is turned on, and the second target DC voltage output by the second DC-DC converter 62 is charged to the power-consuming device via the second charging interface circuit 322. When the third charging interface circuit 324 is connected to the power-consuming device, the third output switch circuit 323 is turned on, and the second target DC voltage output by the second DC-DC converter 62 is charged to the power-consuming device via the third charging interface circuit 324.

[0057] The second output switch circuit 321 includes an output switch tube Q23 and a capacitor C23. The current input end of the output switch tube Q23 is connected to the second target DC voltage output end of the second DC-DC converter 62, the current output and the first end of the capacitor C23 are connected to one end of the second charging interface circuit 322, and the second end of the capacitor C23 is grounded. The third output switch circuit 323 includes an output switch tube Q24 and a capacitor C24. The current input end of the output switch tube Q24 is connected to the second target DC voltage output end of the second DC-DC converter 62, the current output and the first end of the capacitor C24 are connected to one end of the third charging interface circuit 324, and the second end of the capacitor C24 is grounded. The second charging interface circuit 322 and the third charging interface circuit 324 can be USB interface circuits, type-c interface circuits, or lightning interface circuits, respectively. The switch tube Q23 and the switch tube Q24 can be single NMOS tubes, or two corresponding NMOS tubes in a dual NMOS tube.

[0058] The switch control terminal of the switch tube Q23 is connected to the fourth gate control terminal of the second synchronous buck conversion chip 621. The fourth gate control terminal of the second synchronous buck conversion chip 621 is used to output the switch control signal DG23 of the switch tube Q23. The switch control terminal of the switch tube Q24 is connected to the fifth gate control terminal of the second synchronous buck conversion chip 621. The fifth gate control terminal of the second synchronous buck conversion chip 621 is used to output the switch control signal DG24 of the switch tube Q24. The second synchronous buck conversion chip 621 also includes a second detection terminal connected to the first end of the capacitor C23. The second synchronous buck conversion chip 621 determines whether the second charging interface circuit 322 is connected to the electrical device according to the voltage of the first end of the capacitor C23, and if so, controls the switch tube Q23 to be turned on. The second synchronous buck conversion chip 621 also includes a third detection terminal connected to the first end of the capacitor C24. The second synchronous buck converter chip 621 determines whether the third charging interface circuit 324 is connected to the power-consuming device according to the voltage at the first end of the capacitor C24, and if so, controls the switch tube Q24 to be turned on. The second synchronous buck converter chip 621 can be a buck control chip with a built-in fast charging protocol, such as but not limited to the Zhirong SW3556 chip.

[0059] Please continue reading Figure 2As shown, the power conversion circuit provided according to other embodiments of the present application also includes an MCU7 connected to the relay opening and closing circuit 4, the first DC-DC converter 61 and the second DC-DC converter 62 respectively. MCU7 is used to control the output power of the first DC output terminal 31 and the second DC output terminal 32, and is reused to control the opening and closing state of the relay opening and closing circuit 4. The distribution of the output power of the first DC output terminal 31 and the second DC output terminal 32 is controlled by MCU7 to meet the needs of different electrical equipment. At the same time, MCU7 is reused as the controller of the relay opening and closing circuit 4, and there is no need to configure an additional controller for the relay opening and closing circuit 4, which is beneficial to reduce the power consumption module of the power conversion circuit. Therefore, the power conversion circuit provided in the embodiment of the present application has low heat generation and low manufacturing cost, which is conducive to long-term use.

[0060] For details, please continue to refer to Figure 3 and Figure 4 As shown, MCU7 is connected to the first synchronous buck conversion chip 611 and the second synchronous buck conversion chip 612 respectively, and is used to input corresponding power allocation instructions to the first synchronous buck conversion chip 611 and the second synchronous buck conversion chip 612 to allocate the output power of the first DC-DC converter 61 and the second DC-DC converter 62.

[0061] Please continue reading Figure 2 As shown, in other embodiments, the power conversion circuit further includes a current sensor 8 connected to the AC output terminal 2 and the MCU7 respectively. The current sensor 8 is used to collect the output current of the AC output terminal, and send the output current to the MCU7, and the MCU7 controls the opening and closing state of the relay opening and closing circuit 4 according to the output current. When the output current reaches or exceeds the threshold current, the MCU7 controls the relay opening and closing circuit 4 to open, and the connection between the AC input terminal 1 and the AC output terminal 2 is disconnected to avoid causing power safety accidents. When the output current does not reach the threshold current, the MCU7 controls the relay opening and closing circuit 4 to close, and the AC input terminal 1 inputs an AC voltage to the AC output terminal 2 through the relay opening and closing circuit 4, and the AC voltage provides AC power to the electrical equipment via the AC output terminal 2.

[0062] Please continue reading Figure 2 As shown, in other embodiments, the power conversion circuit also includes a relay opening and closing indicator light circuit 9 connected to the MCU7, which is used to indicate the opening and closing state of the relay opening and closing circuit 4, so that the user can know the current state of the power conversion circuit and improve the safety of electricity use. Specifically, when the relay opening and closing circuit 4 is closed, the MCU7 controls the indicator light in the relay opening and closing indicator light circuit to light up, and when the relay opening and closing circuit 4 is opened, the MCU7 controls the indicator light in the relay opening and closing indicator light circuit to go out.

[0063] See also Figure 5As shown, it is a schematic diagram of a circuit structure that can be realized according to some embodiments of the present application. In some embodiments, the power conversion circuit also includes a power switch key SW connected to the MCU7, and the MCU7 is also used to control the opening and closing state of the relay opening and closing circuit 4 according to the state of the power switch key SW. Specifically, when the power switch key SW is executed by the first operation, the MCU7 controls the relay opening and closing circuit 4 to close, and when the power switch key SW is executed by the second operation, the MCU7 controls the relay opening and closing circuit 4 to open. The power switch key SW can be a mechanical key or a touch key.

[0064] Please continue reading Figure 5 As shown, in some embodiments, the relay opening and closing circuit 4 includes a relay 41 connected between the AC input terminal 1 and the AC output terminal 2, and a drive circuit 42 and a power supply circuit 43 respectively connected to the relay 41. When the relay 41 is in an open state, the electrical connection path between the AC input terminal 1 and the AC output terminal 2 is disconnected, and when the relay 41 is closed, the electrical connection path between the AC input terminal 1 and the AC output terminal 2 is connected. Specifically, the relay 41 can be a normally open relay, one of which is connected to the AC input terminal 1, and the other is connected to the AC output terminal 2. One end of the coil is connected to the drive circuit 42, and the other end is connected to the power supply circuit 43. When the coil of the relay 41 is energized, its two normally open contacts are closed, and the connection path between the AC input terminal 1 and the AC output terminal 2 is connected, and vice versa.

[0065] The driving circuit 42 is connected to the MCU7 and is used to drive the opening and closing state of the relay 41. Specifically, the driving circuit 42 includes a transistor Q31, a diode D31, resistors R31, R32 and a capacitor C31. Among them, the collector of the transistor Q31 is connected to the first end of the coil of the relay 41, the emitter is grounded, the base is connected to the MCU7 through the resistor R31, and the second end of the coil of the relay 41 receives the power supply voltage VP output by the power supply circuit. The MCU7 is used to control the switching state of the transistor Q13 according to the output current collected by the current sensor 8. When the transistor Q31 is turned on, the coil of the relay 41 is energized, and the relay 41 is closed. When the transistor Q31 is turned off, the coil of the relay 41 is de-energized, and the relay 41 is opened. The two ends of the resistor R32 are respectively connected to the base and the ground terminal of the transistor Q31, and the capacitor C31 is connected in parallel with the resistor R32.

[0066] See also Figure 6As shown, it is a schematic diagram of an achievable circuit structure of a power supply circuit 43 in a power conversion circuit provided according to some embodiments of the present application. The power supply circuit 43 is specifically a DC-DC circuit, and its input end is connected to the output end of the AC-DC conversion circuit 5, and is used to receive the multiplexed DC voltage VCP, and convert the multiplexed DC voltage VCP into the power supply voltage VP of the relay 41. Specifically, the power supply circuit 43 includes a buck conversion chip and a third power stage circuit, and the buck conversion chip is used to control the third power stage circuit to perform power conversion, that is, to convert the multiplexed DC voltage into the power supply voltage VP output. The third power stage circuit includes a main power switch tube integrated in the buck conversion chip, an energy storage inductor L51, an input filter circuit, an output filter circuit and an output capacitor. As shown Figure 5 As shown, the input filter circuit includes a capacitor C51 and a capacitor C52 connected in parallel between the input end and the ground end of the buck converter chip, and the output filter circuit includes an RC circuit connected between the first end of the energy storage inductor L51 and the ground end, and the RC circuit is formed by connecting a resistor R51 and a capacitor C53 in series. The first end of the energy storage inductor L51 is connected to the current output end of the main power switch tube integrated in the buck converter chip, and the current input end of the main power switch tube in the buck converter chip receives the reused DC voltage VCP. The second end of the energy storage inductor L51 and the first end of the output capacitor are connected to the power supply voltage output end to output the power supply voltage VP, and the second end of the output capacitor is grounded. Specifically, the output capacitor includes but is not limited to an electrolytic capacitor C54 and a capacitor C55 connected in parallel between the power supply voltage output end and the ground end.

[0067] In this embodiment, the buck conversion chip is a chip that integrates a buck conversion controller and a main power switch tube. In other embodiments, the buck conversion chip can also be just a buck conversion control chip, and the main power switch tube is arranged on the periphery of the buck conversion control chip.

[0068] Furthermore, the power supply circuit 43 also includes a current sampling resistor R52 connected between the second end of the energy storage inductor L51 and the power supply voltage output terminal, which is used to collect the output current of the power supply circuit 43 and feed it back to the buck converter chip. The power supply circuit 43 also includes an output voltage feedback circuit connected to the power supply voltage output terminal, which is used to collect the power supply voltage VP and feed it back to the buck converter chip. The voltage feedback circuit is such as a resistor divider circuit composed of a resistor R53 and a resistor R54. The buck converter chip controls the switching state of the main power switch tube according to the output current and output voltage fed back to convert the reused DC voltage VCP into the power supply voltage VP output. Specifically, the reused DC voltage VCP can be a voltage of 21V, and the power supply voltage VP can be a voltage of 5V.

[0069] In some embodiments, the power supply circuit 43 is also connected to the relay opening and closing indicator light circuit 9 to supply power to the relay opening and closing indicator light circuit 9. Figure 5 As shown, the relay opening and closing indicator light circuit 9 includes a light emitting diode D91, a switch tube Q32, a resistor R35 and a resistor R36. The anode of the light emitting diode D91 is connected to the power supply voltage output terminal of the power supply circuit 43 for receiving the power supply voltage VP. The cathode of the light emitting diode D91 is connected to the current input terminal of the switch tube Q32. The current output terminal of the switch tube Q32 is grounded, the switch control terminal is connected to the MCU7 through the resistor R35, and the resistor R36 is connected between the switch control terminal and the ground terminal of the switch tube Q32. When the MCU7 controls the relay 41 to be closed, the switch tube Q32 is turned on, and the light emitting diode D91 is lit. When the MCU7 controls the relay 41 to be opened, the switch tube Q32 is turned off, and the light emitting diode D91 is extinguished.

[0070] Please continue reading Figure 5 As shown, in some embodiments, the current sensor 8 includes a current sensor chip 81, a resistor R33, a diode D32, a resistor R34 and a capacitor C32. The sensor chip 81 is used to collect the output current of the AC output terminal 2, the first end of the resistor R33 is connected to the collection output terminal of the current sensor chip 81, and the second end is connected to the anode of the diode D32. The cathode of the diode D32 is connected to the MCU7 to input the output current collected by the current sensor chip 81 to the MCU7. The first end of the resistor R43 is connected to the anode of the diode D32, and the second end is grounded. The first end of the capacitor C32 is connected to the cathode of the diode D32, and the second end is grounded. In the present application, when the switch tube is a MOS tube, the current input end of the switch tube is one of the source terminal and the drain terminal, the current output end of the switch tube is the other of the source terminal and the drain terminal, and the switch control end of the switch tube is the gate terminal.

[0071] In some embodiments, the present application further provides a socket, including a housing, a plug connected to the housing, an AC charging port and a DC charging port provided on the housing, and a circuit board provided in the housing, on which a power conversion circuit provided in accordance with any embodiment of the present application is provided. Among them, the AC input terminal is connected to the plug, the AC output terminal is connected to the AC charging port, and the DC output terminal is connected to the DC charging port. The socket provided in accordance with the embodiment of the present application and the power conversion circuit provided in the embodiment of the present application can achieve the same technical effect, and will not be repeated again.

[0072] See also Figure 7As shown, it is a schematic diagram of the appearance of a socket provided according to some embodiments of the present application. In some embodiments, the socket provided in the present application is specifically a power strip, which includes a housing composed of a detachable front cover 10 and a rear cover 20, and a plug 40 with a power cord 30, and the plug 40 is used to connect to an external AC power source to receive an AC voltage. The AC charging port 50, the DC charging port 60 and the power switch 70 are respectively arranged on the front cover 10. Specifically, the DC charging port 60 is arranged on the side opposite to the front cover 10 and the rear cover 20, and the AC charging port 50 is arranged on the side adjacent to the charging port 60. The number of AC charging ports 50 and DC charging ports 60 can be multiple respectively. The AC of the AC charging port 50 is specifically an AC jack (AC jack), which is used to provide AC power supply to the electrical device. The DC charging port can be specifically a DC jack (DC jack), which is used to provide DC power supply to the electrical device, wherein the DC jack can be a jack corresponding to a USB interface, a type-c interface and / or a light igning interface. Specifically, the number of AC jacks may be but is not limited to two, and the number of DC jacks may be but is not limited to three. Figure 8 As shown. The circuit board 80 and the relay 41 are respectively located inside the housing of the socket. The AC socket under the AC port is located on one side of the housing, and the relay 41 and the circuit board 80 are located on the other side of the housing to separate the high-voltage components from the low-voltage components and improve the electrical safety of the socket. The socket provided in the embodiment of the present application is not limited to Figure 7 and Figure 8 The structure shown will not be described again here.

[0073] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A power conversion circuit, characterized in that: It includes an AC input terminal, an AC output terminal, a DC output terminal, a relay opening and closing circuit, an AC-DC conversion circuit, and a DC-DC conversion circuit; The AC input terminal is connected to the AC output terminal through the relay opening and closing circuit; The AC-DC conversion circuit is connected to the relay opening and closing circuit and the DC-DC conversion circuit respectively, and is used to convert the AC voltage input through the AC input terminal into a multiplexed DC voltage to serve as the input voltage of the DC-DC conversion circuit and to be multiplexed to power the relay opening and closing circuit; The DC-DC conversion circuit is connected to the DC output terminal, and is used to convert the multiplexed DC voltage into a target DC voltage, and output it via the DC output terminal.

2. The power conversion circuit according to claim 1, characterized in that: The number of the DC output terminals is multiple, and the power conversion circuit further includes an MCU connected to the relay opening and closing circuit; The DC-DC conversion circuit is connected to the plurality of DC output terminals respectively, and the MCU is connected to the DC-DC conversion circuit, and is used to distribute the output power of the plurality of DC output terminals, and is reused to control the switch state of the relay opening and closing circuit; or; The AC-DC conversion circuit and the DC-DC conversion circuit are respectively connected to corresponding DC output terminals among the multiple DC output terminals, and the MCU is respectively connected to the AC-DC conversion circuit and the DC-DC conversion circuit, and is used to distribute the output power of the multiple DC output terminals and is reused to control the switching state of the relay opening and closing circuit.

3. The power conversion circuit according to claim 2, characterized in that: Also included are current sensors connected to the AC output terminal and the MCU respectively; The current sensor is used to collect the output current of the AC output end and send the output current to the MCU; The MCU controls the opening and closing state of the relay opening and closing circuit according to the output current.

4. The power conversion circuit according to claim 2, characterized in that: It also includes a power switch key connected to the MCU, and the MCU is also used to control the opening and closing state of the relay opening and closing circuit according to the state of the power switch key.

5. The power conversion circuit according to claim 2, characterized in that: The relay opening and closing circuit includes a relay connected between the AC input terminal and the AC output terminal, and a drive circuit and a power supply circuit respectively connected to the relay; When the relay is in an open state, the electrical connection path between the AC input terminal and the AC output terminal is disconnected, and when the relay is in a closed state, the electrical connection path between the AC input terminal and the AC output terminal is connected; The driving circuit is connected to the MCU and is used to drive the opening and closing state of the relay; The power supply circuit is connected to the AC-DC conversion circuit and is used to convert the multiplexed DC voltage into a power supply voltage for the relay.

6. The power conversion circuit according to claim 5, characterized in that: It also includes a relay opening and closing indicator light circuit connected to the MCU, and the relay opening and closing indicator light circuit is used to indicate the opening and closing state of the relay opening and closing circuit.

7. The power conversion circuit according to claim 6, characterized in that: The power supply circuit is also connected to the relay opening and closing indicator light circuit to supply power to the relay opening and closing indicator light circuit.

8. The power conversion circuit according to any one of claims 1 to 7, characterized in that: The DC output terminal includes a first DC output terminal and a second DC output terminal, and the DC-DC conversion circuit includes a first DC-DC converter connected to the first DC output terminal and a second DC-DC converter connected to the second DC output terminal; The first DC-DC converter is used to convert the multiplexed DC voltage into a first target DC voltage and output it via the first DC output terminal; The second DC-DC converter is used to convert the multiplexed DC voltage into a second target DC voltage and output it via the second DC output terminal.

9. The power conversion circuit according to claim 8, characterized in that: At least one of the first DC-DC converter and the second DC-DC converter is a synchronous step-down DC-DC converter; and / or, At least one of the first DC output terminal and the second DC output terminal includes a plurality of charging interface circuits and a plurality of output switch circuits; Each of the charging interface circuits is connected to a corresponding target DC voltage output terminal through each of the output switch circuits. When the output switch circuit is turned on, the corresponding charging interface circuit outputs a corresponding target DC voltage.

10. A socket, characterized in that: It comprises a housing, a plug connected to the housing, an AC charging port and a DC charging port provided on the housing, and a circuit board provided in the housing, wherein the circuit board is provided with a power conversion circuit according to any one of claims 1 to 9; The AC input end is connected to the plug, the AC output end is connected to the AC charging port, and the DC output end is connected to the DC charging port.

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