Socket

Abstract

The utility model discloses a socket, comprising a rectification filter circuit, a DC-DC first step-down circuit, an H-bridge circuit, a sine wave calibration circuit and a first jack which are electrically connected in sequence, and a control circuit which is electrically connected with the rectification filter circuit and the H-bridge circuit. The rectifying and filtering circuit is used for rectifying and filtering input commercial power and converting the commercial power into direct current with a first preset voltage value; the DC-DC first step-down circuit is used for carrying out step-down processing on the direct current output by the rectification filter circuit to obtain direct current with a second preset voltage value; and the control circuit is used for controlling the H-bridge circuit to convert the direct current output by the DC-DC first step-down circuit into alternating current matched with the target frequency and the target voltage value. And the sine wave calibration circuit is used for carrying out waveform correction and amplitude adjustment on the alternating current output by the H-bridge circuit. By adopting the scheme, the problem that the use of equipment is limited due to different power grid standards in different regions is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of power sockets, in particular to a socket. Background Art

[0002] With the development of global economic integration and tourism, the demand for cross-regional use of electronic equipment has increased significantly.

[0003] Take the United States and China as an example. There are significant differences in the power grid standards of the two countries: the United States uses a 110-120V / 60Hz power supply system, and China uses a 220-240V / 50Hz system. This difference causes 110V / 60Hz devices (such as laptops, small appliances, etc.) carried by American users to burn out or damage their performance due to voltage incompatibility when used in China, or cause motor equipment (such as fans, compressors, etc.) to operate abnormally due to frequency differences, or even shorten their service life.

[0004] Therefore, how to provide a socket with voltage conversion and frequency adaptation is a technical problem that needs to be solved urgently. Utility Model Content

[0005] The main purpose of the utility model is to provide a socket with the functions of voltage conversion and frequency adaptation, aiming to solve the problem of limited use of equipment due to different power grid standards in different regions.

[0006] To achieve the above object, the utility model provides a socket, comprising: a rectifier filter circuit, a DC to DC converter (Direct Current to Direct Current) electrically connected in sequence A first step-down circuit, an H-bridge circuit and a first socket of a DC-DC converter, and a control circuit electrically connected to the rectifier and filter circuit and the H-bridge circuit; wherein the rectifier and filter circuit is used to rectify and filter the input mains power and convert it into a direct current of a first preset voltage value; the DC-DC first step-down circuit is used to step down the direct current output by the rectifier and filter circuit to obtain a direct current with a second preset voltage value; the control circuit is used to control the H-bridge circuit to convert the direct current output by the DC-DC first step-down circuit into an alternating current matching a target frequency and a target voltage value, wherein the target frequency and the target voltage value match the standard frequency and the standard voltage value specified by the power supply system of the target country / region; at least one of the target frequency and the target voltage value is different from the frequency and the voltage value of the input mains power; the structure and electrical parameters of the first socket meet the plug-in requirements of electrical equipment under the power supply system of the target country / region, and is used for plugging in electrical equipment that meets the power supply system of the target country / region, and providing adapted electric energy for the electrical equipment.

[0007] This solution can convert the input city electricity into the electricity required by the power supply system of the target country / region, solving the problem of limited equipment use due to different power grid standards in different regions and meeting the needs of cross-regional use of electronic equipment between countries.

[0008] In combination with the first aspect, in a first possible implementation manner of the first aspect, the control circuit includes: a DC-DC second step-down circuit and a microcontroller unit (MCU) circuit; the DC-DC second step-down circuit is used to step down the direct current output by the rectifier and filter circuit to provide the MCU circuit with a voltage that matches its working requirements; the MCU circuit is used to generate a control signal to control the H-bridge circuit to convert the direct current output by the DC-DC first step-down circuit into alternating current with the target frequency and the target voltage value.

[0009] Based on the above scheme, the DC-DC second step-down circuit is used to ensure the stable operation of the MCU circuit. The MCU circuit accurately controls the H-bridge circuit, which improves the accuracy and stability of voltage and frequency conversion, and is conducive to ensuring the safe and stable operation of electrical equipment.

[0010] In combination with the first aspect, in a second possible implementation of the first aspect, the socket also includes: a sine wave calibration circuit, which is electrically connected to the H-bridge circuit and the first socket respectively; the sine wave calibration circuit is used to perform waveform correction and amplitude adjustment on the alternating current output by the H-bridge circuit so that it conforms to the waveform parameters of the standard sine wave and the standard frequency and the standard voltage value of the power supply system of the target country / region.

[0011] Based on the above scheme, through the sine wave calibration circuit, the output AC power is made to approach the standard sine wave parameters and the power supply standards of the target country / region, thereby reducing harmonic interference, improving the power supply quality, reducing damage to electrical equipment, and extending the service life of electrical equipment.

[0012] In combination with the first aspect, in a third possible implementation of the first aspect, the socket also includes: an H-bridge pre-drive circuit, which is electrically connected to the MCU circuit and the H-bridge circuit respectively; the H-bridge pre-drive circuit is used to filter, level convert and power amplify the control signal output by the MCU circuit, and provide a control signal that meets the driving characteristics of the power switching device in the H-bridge circuit.

[0013] Based on the above scheme, the H-bridge pre-driver circuit provides a suitable drive signal for the power switch device in the H-bridge circuit, ensuring the normal operation of the H-bridge circuit, improving the circuit conversion efficiency and stability, and enhancing the overall performance of the socket.

[0014] In combination with the first aspect, in a fourth possible implementation of the first aspect, the socket also includes: an overcurrent and overvoltage detection circuit, which is electrically connected to the MCU circuit and the first socket respectively; the overcurrent and overvoltage detection circuit is used to monitor the current and voltage of the first socket in real time, and when an overcurrent and / or overvoltage condition is detected, a signal is sent to the MCU circuit to trigger the MCU circuit to perform a protection operation.

[0015] Based on the above scheme, when overcurrent and / or overvoltage occurs, the overcurrent and overvoltage detection circuit can promptly trigger the MCU circuit to perform protection operations, thereby preventing electrical equipment from being damaged by abnormal current and voltage, thereby improving the safety of socket use and helping to protect user equipment.

[0016] In combination with the first aspect, in some possible implementations, the H-bridge circuit includes: a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a first half-bridge driver chip, and a second half-bridge driver chip; the drain of the first MOS tube is connected to the positive pole of the power supply, and the source of the first MOS tube is connected to the drain of the third MOS tube; the drain of the second MOS tube is connected to the positive pole of the power supply, the source of the second MOS tube is connected to the drain of the fourth MOS tube, the source of the third MOS tube is grounded, and the source of the fourth MOS tube is grounded; the high-side drive signal output pin of the first half-bridge driver chip is connected to the gate of the first MOS tube, the low-side drive signal output pin of the first half-bridge driver chip is connected to the gate of the third MOS tube, and the A half-bridge driver chip is used to control the conduction and cutoff of the first MOS tube and the third MOS tube; a high-side drive signal output pin of the second half-bridge driver chip is connected to the gate of the second MOS tube, and a low-side drive signal output pin of the second half-bridge driver chip is connected to the gate of the fourth MOS tube, and the second half-bridge driver chip is used to control the conduction and cutoff of the second MOS tube and the fourth MOS tube; under the coordinated control of the first half-bridge driver chip and the second half-bridge driver chip, by regulating the conduction and cutoff timing of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube, the direct current output by the DC-DC first step-down circuit is converted into alternating current with the target frequency and the target voltage value.

[0017] Based on the above scheme, the H-bridge circuit of this structure can efficiently convert DC power into AC power of target frequency and voltage value, with high conversion efficiency and good stability, providing reliable guarantee for realizing voltage conversion and frequency adaptation of the socket.

[0018] In combination with the first aspect, in some possible implementations, the output end of the H-bridge circuit is connected to a sine wave calibration circuit, and the sine wave calibration circuit includes: a first inductor and a first capacitor, the first inductor and the first capacitor constitute an LC resonant circuit, one end of the first inductor is connected to the connection point of the source of the first MOS tube and the drain of the third MOS tube in the H-bridge circuit, the other end of the first inductor is connected to the neutral line of the first socket and one end of the first capacitor; the other end of the first capacitor is connected to the live line of the first socket and the connection point of the source of the second MOS tube and the drain of the fourth MOS tube.

[0019] By adopting this solution, through the use of a sine wave calibration circuit, the waveform correction and amplitude adjustment of the alternating current output by the H-bridge circuit can be performed more accurately, which is beneficial to improving the quality of electric energy and ensuring the stable operation of electrical equipment.

[0020] In combination with the first aspect, in some possible implementations, the DC-DC first step-down circuit includes: a first switch tube, a second switch tube, a second inductor and a second capacitor; wherein the second switch tube is a MOS tube with a low on-resistance characteristic, one end of the first switch tube is connected to the output end of the rectifier and filter circuit, the other end of the first switch tube is connected to one end of the second inductor and the drain of the second switch tube, the other end of the second inductor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; a line is led out at the connection point of the second inductor and the second capacitor as an output end; when the first switch tube is turned off and the circuit enters the freewheeling stage, the second switch tube provides a freewheeling path for the current of the second inductor.

[0021] The DC-DC first step-down circuit provided by the solution is beneficial to improving step-down efficiency, reducing energy loss, enhancing circuit stability, and ensuring efficient operation of the entire socket power supply system.

[0022] In combination with the first aspect, in some possible implementations, the socket also includes: a first circuit for converting the input AC power into a power source that is compatible with the output specifications of a Type C socket, and a Type C socket connected to the first circuit; and / or, a second circuit for converting the input AC power into a power source that is compatible with the output specifications of a USB socket, and a USB socket connected to the second circuit.

[0023] This solution meets the charging needs of various electronic devices by increasing the types of socket interfaces, thereby improving the practicality and convenience of the socket.

[0024] In combination with the first aspect, in some possible implementations, the socket further includes: a third circuit for converting input AC power into an electrical device adapted to the input AC power, and a socket adapted to the input AC power standard electrically connected to the third circuit.

[0025] This solution takes into account the usage requirements of equipment in the country / region where the input mains power is located, allowing the socket to directly power local equipment, improving the versatility and applicability of the socket and meeting the usage requirements of different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1A This is a schematic diagram of the appearance structure of a socket in one embodiment of the utility model;

[0027] Figure 1B This is a schematic diagram of the appearance structure of a socket in another embodiment of the utility model;

[0028] Figure 1C A schematic diagram of the circuit structure of a socket provided in one embodiment of the utility model;

[0029] Figure 1D A schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0030] Figure 1E A schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0031] Figure 1F A schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0032] Figure 2A A schematic diagram of the circuit structure of a socket provided in one embodiment of the utility model;

[0033] Figure 2B for Figure 2A A schematic diagram of circuit signal conversion of the illustrated embodiment;

[0034] Figure 2C A schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0035] Figure 2D A schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0036] Figure 2E A schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0037] Figure 2FA schematic diagram of the circuit structure of a socket provided in another embodiment of the utility model;

[0038] Figure 3A A schematic diagram of the circuit structure of a socket provided in one embodiment of the utility model;

[0039] Figure 3B for Figure 3A A schematic diagram of circuit signal conversion of the illustrated embodiment;

[0040] Figure 4A A partial circuit diagram of an H-bridge circuit and a sine wave calibration circuit in one embodiment;

[0041] Figure 4B FIG. 4 is a partial circuit diagram of a DC-DC first step-down circuit in an embodiment. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the scheme in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that all directional indications (such as up, down, left, right, front and back) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0045] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0046] One application scenario applicable to the utility model includes: when an American user travels to the People's Republic of China, the rated voltage of the electronic device D1 carried by the user is 110V and the rated frequency is 60Hz. Since the specifications of the mains electricity in the People's Republic of China are 220V and 50Hz, which do not match the rated parameters of the electronic device D1, direct connection will cause safety hazards. Therefore, D1 cannot be directly connected to the mains electricity of the People's Republic of China. The socket provided by the utility model can solve this cross-domain use problem and meet the needs of users to use the electronic device in the People's Republic of China.

[0047] It should be noted that the utility model provides a solution, and the mains electricity in its applicable scenarios is not limited to the mains electricity of the People's Republic of China, but can also be the mains electricity of other countries / regions, for example, it can also be the mains electricity of the United Kingdom (230V, 50Hz), etc. Similarly, the target country / region is not limited to the United States, for example, it can also be Canada, Japan, etc., and the utility model does not limit this. At least one of the target frequency and the target voltage value is different from the frequency and voltage value of the input mains electricity. For the convenience of description, in the embodiments of the utility model, the mains electricity is described by taking the mains electricity of the People's Republic of China as an example, and the target country / region is described by taking the United States as an example.

[0048] A feasible implementation method of the socket provided by the utility model is as follows Figure 1A As shown, the socket 100 has two sockets, namely a first socket 101 and a second socket 102 . The electronic device D1 is connected to the socket 100 via the first socket 101 , and the socket 100 is connected to the 220V / 50Hz mains electricity via the second socket 102 .

[0049] Figure 1B The socket shown is a schematic diagram of the appearance structure of another feasible implementation of the utility model. This socket 110 is provided with two third sockets 111, which are suitable for connecting electronic devices with a rated voltage of 110V and a rated frequency of 60Hz. A Type C socket 112 and three USB sockets 113 are provided on the side of the socket 110, which are convenient for charging a variety of devices. A fourth socket 114 is provided on the other side of the socket, and the fourth socket 114 is used to connect to the 220V, 50Hz mains power of the People's Republic of China to achieve voltage conversion and device access functions.

[0050] Understandably, as a feasible solution, Figure 1B The number and position of the third socket, the fourth socket, the Type C socket and the USB socket can be arranged according to actual needs. In addition, to improve practicality, sockets suitable for 220V, 50Hz electronic devices can be added to the socket to meet the power requirements of electronic devices of different specifications.

[0051] Based on the above utility model concept, Figure 1C As shown, in one embodiment, the socket 120 includes: a rectifying and filtering circuit 121 , a DC-DC first buck circuit 122 , an H-bridge circuit 123 , a first socket 124 and a control circuit 125 .

[0052] The rectifier and filter circuit 121 is used to rectify and filter the mains electricity of the People's Republic of China and convert it into direct current with a first preset voltage value; the DC-DC first step-down circuit 122 is used to step down the direct current output by the rectifier and filter circuit to obtain direct current with a second preset voltage value; the control circuit 125 is used to control the H-bridge circuit 123 to convert the direct current output by the DC-DC first step-down circuit 122 into alternating current matching the target frequency and target voltage value, wherein the target frequency and target voltage value match the standard frequency and standard voltage value specified by the power supply system of the target country / region; the structure and electrical parameters of the first socket 124 meet the plug-in requirements of electrical equipment under the power supply system of the target country / region, and are used for plugging in electrical equipment that meets the power supply system of the target country / region and providing adaptive electrical energy to the electrical equipment.

[0053] In one implementation scenario, Figure 1C The working principle of the socket shown includes: after the 220V, 50Hz AC mains power supply is connected, it first passes through the rectifier and filter circuit 121 to convert the AC mains power into a DC power with a voltage value of 311V. Then, the DC-DC first step-down circuit 122 reduces the voltage of the rectified and filtered 311V DC power to a DC power of 155V. When the target country is the United States, the H-bridge circuit 123, under the control of the control circuit 125, converts the 155V DC power into an AC power with a frequency of 60Hz and a voltage of 110V, and outputs it through the first socket 124.

[0054] It should be noted that the first preset voltage value and the second preset voltage value are not limited to 311V and 155V described in this example. In actual implementation, they can be configured as needed, and this application does not limit their specific values.

[0055] This solution can convert the city electricity of the People's Republic of China into the electricity required by the power supply system of the target country / region, solving the problem of limited equipment use due to different power grid standards in different regions and meeting the needs of cross-regional use of electronic equipment between countries.

[0056] like Figure 1DAs shown, in some possible implementations, the control circuit 125 may include: a DC-DC second step-down circuit 1251 and an MCU circuit 1252; the DC-DC second step-down circuit 1251 is used to step down the DC power output by the rectifier and filter circuit 121 to provide the MCU circuit 1252 with a voltage that matches its working requirements; the MCU circuit 1252 is used to generate a control signal to control the H-bridge circuit 123 to convert the DC power output by the DC-DC first step-down circuit 122 into AC power that matches the target frequency and target voltage value.

[0057] Based on the above scheme, the DC-DC second step-down circuit is used to ensure the stable operation of the MCU circuit. The MCU circuit accurately controls the H-bridge circuit, which improves the accuracy and stability of voltage and frequency conversion, and is conducive to ensuring the safe and stable operation of electrical equipment.

[0058] like Figure 1E As shown, in some possible implementations, the socket 130 includes: a rectifier and filter circuit 131, a DC-DC first step-down circuit 132, an H-bridge circuit 133, a first socket 134, a control circuit 135, and a conversion circuit 136 and a second socket 137 electrically connected to the conversion circuit 136, wherein the second socket 137 can be a Type C socket and / or a USB socket.

[0059] The rectifier and filter circuit 131 is used to rectify and filter the mains electricity of the People's Republic of China and convert it into direct current with a first preset voltage value; the DC-DC first step-down circuit 132 is used to step down the direct current output by the rectifier and filter circuit to obtain direct current with a second preset voltage value; the control circuit 135 is used to control the H-bridge circuit 133 to convert the direct current output by the DC-DC first step-down circuit 132 into alternating current matching the target frequency and target voltage value, wherein the target frequency and target voltage value match the standard frequency and standard voltage value specified by the power supply system of the target country / region; the structure and electrical parameters of the first socket 134 meet the plug-in requirements of electrical equipment under the power supply system of the target country / region, and are used for plugging in electrical equipment that meets the power supply system of the target country / region and providing adaptive electrical energy to the electrical equipment.

[0060] In some possible implementations, when the second socket is a Type C socket, the conversion circuit is used to convert the mains power of the People's Republic of China so that its output parameters adapt to the power requirements of the Type C socket; when the second socket is a USB socket, the conversion circuit is used to convert the mains power of the People's Republic of China into electrical energy that meets the power standards of the USB socket.

[0061] This solution meets the charging needs of various electronic devices by increasing the types of socket interfaces, thereby improving the practicality and convenience of the socket.

[0062] like Figure 1F As shown, in some possible implementations, the socket 140 includes: a third socket 141, a rectifier filter circuit 142, a DC-DC first buck circuit 143, an H-bridge circuit 144, a first socket 145, a control circuit 146, and a first conversion circuit 147 and a second socket 148 electrically connected to the first conversion circuit 147, the second socket 148 can be a Type C socket and / or a USB socket, the socket 140 also includes a second conversion circuit 149, and a fourth socket 1410 electrically connected to the second conversion circuit 149. The second conversion circuit 149 is used to convert the mains electricity of the People's Republic of China into electrical energy that meets the power consumption standard of the mains standard socket of the People's Republic of China.

[0063] This solution takes into account the usage needs of domestic equipment, so that the socket can directly power local equipment when used domestically, improving the versatility and applicability of the socket and meeting the usage needs of different scenarios.

[0064] like Figure 2A As shown, in one embodiment, the socket 200 includes: a rectifier and filter circuit 201, a DC-DC first buck circuit 202, an H-bridge circuit 203, a first socket 204, a DC-DC second buck circuit 205 and an MCU circuit 206.

[0065] Combination Figure 2B right Figure 2A The working process is described in detail, taking the target country as the United States as an example, the corresponding target voltage is 110V and the target frequency is 60Hz. In actual use, after the 220V, 50Hz AC mains power supply is connected, it first passes through the rectifier and filter circuit 201 to convert the AC power into a DC power with a voltage value of 311V. Then, the DC-DC first step-down circuit 202 reduces the voltage of the rectified and filtered 311V DC power to 155V DC power.

[0066] The DC-DC second step-down circuit 205 steps down the 311V DC power to 5V DC power, providing the MCU circuit 206 with a voltage that matches its working requirements; under the control of the sinusoidal pulse width modulation (SPWM) signal output by the MCU circuit 206, the H-bridge circuit 203 converts the 155V DC power into an AC power with a frequency of 60Hz and a voltage of 110V, and outputs it through the first socket 204.

[0067] like Figure 2C As shown, in one embodiment, the socket 210 is relative to Figure 2AThe socket shown has an additional sine wave calibration circuit 207. The sine wave calibration circuit 207 is electrically connected to the H-bridge circuit and the first socket respectively; the sine wave calibration circuit 207 is used to perform waveform correction and amplitude adjustment on the alternating current output by the H-bridge circuit so that it complies with the waveform parameters of the standard sine wave and the standard frequency and standard voltage values ​​of the power supply system of the target country / region.

[0068] This embodiment uses a sine wave calibration circuit to make the output AC power approach standard sine wave parameters and the power supply standard of the target country / region, thereby reducing harmonic interference, improving power supply quality, reducing damage to electrical equipment, and extending the service life of electrical equipment.

[0069] like Figure 2D As shown, in one embodiment, the socket 220 is relative to Figure 2A The socket shown has an additional H-bridge pre-driver circuit 208. The H-bridge pre-driver circuit 208 is electrically connected to the MCU circuit and the H-bridge circuit respectively; the H-bridge pre-driver circuit 208 is used to filter, level convert, and power amplify the control signal output by the MCU circuit, and provide the power switch device in the H-bridge circuit with a control signal that meets its driving characteristics.

[0070] This embodiment provides a suitable drive signal for the power switch device in the H-bridge circuit through the H-bridge pre-drive circuit, thereby ensuring the normal operation of the H-bridge circuit, improving the circuit conversion efficiency and stability, and enhancing the overall performance of the socket.

[0071] like Figure 2E As shown, in one embodiment, the socket 230 is relative to Figure 2A The socket 200 shown has an additional overcurrent and overvoltage detection circuit 209, which is electrically connected to the MCU circuit and the first socket respectively; the overcurrent and overvoltage detection circuit 209 is used to monitor the current and voltage of the first socket in real time, and when an overcurrent and / or overvoltage condition is detected, a signal is sent to the MCU circuit to trigger the MCU circuit to perform a protection operation. In some possible implementations, the protection operation performed by the MCU circuit may include: controlling the H-bridge circuit to cut off the output, reduce the output power, etc., which is conducive to protecting the socket itself and the electrical equipment connected to the first socket, and preventing the electrical equipment from being damaged due to overcurrent and overvoltage.

[0072] By adopting this embodiment, when overcurrent and / or overvoltage occurs, the overcurrent and overvoltage detection circuit can promptly trigger the MCU circuit to perform protection operations, thereby preventing electrical equipment from being damaged due to abnormal current and voltage, improving the safety of socket use, and helping to protect user equipment.

[0073] like Figure 2F As shown, in one embodiment, the socket 240 is relative to Figure 2EThe socket shown has an additional H-bridge pre-driver circuit 211. The H-bridge pre-driver circuit 211 is electrically connected to the MCU circuit and the H-bridge circuit respectively; the H-bridge pre-driver circuit 211 is used to filter, level convert, and power amplify the control signal output by the MCU circuit, and provide the power switch device in the H-bridge circuit with a control signal that meets its driving characteristics.

[0074] This embodiment takes into account Figure 2D and Figure 2E The advantages and beneficial effects of each socket in the illustrated embodiment are described above and will not be repeated here.

[0075] like Figure 3A As shown, in one embodiment, the socket 300 includes: an electrically connected rectifier and filter circuit 301, a DC-DC first buck circuit 302, an H-bridge circuit 303, a sine wave calibration circuit 304 and a first socket 305, and a DC-DC second buck circuit 306, an MCU circuit 307 and an H-bridge pre-drive circuit 308 connected between the rectifier and filter circuit 301 and the H-bridge circuit 303, and an overcurrent and overvoltage detection circuit 309 electrically connected to the MCU circuit 307 and the first socket 305.

[0076] Combination Figure 3B right Figure 3AThe working process is described in detail, taking the target country as the United States as an example, the corresponding target voltage is 110V and the target frequency is 60Hz. In actual use, after the 220V, 50Hz AC mains power supply is connected, it first passes through the rectifier and filter circuit 301 to convert the AC power into a DC power with a voltage value of 311V. Then, the DC-DC first step-down circuit 302 reduces the voltage of the rectified and filtered 311V DC power to a DC power of 155V. The DC-DC second step-down circuit 306 reduces the voltage of the 311V DC power to a DC power of 5V, providing the MCU circuit 307 with a voltage that matches its working requirements; under the control of the SPWM signal output by the MCU circuit 307, the H-bridge circuit 303 converts the 155V DC power into an AC power with a frequency of 60Hz and a voltage of 110V, and outputs it through the first socket 305. The sine wave calibration circuit 304 is used to perform waveform correction and amplitude adjustment on the alternating current output by the H-bridge circuit 303, so that it conforms to the waveform parameters of the standard sine wave and the standard frequency and standard voltage value of the power supply system of the target country / region. The H-bridge pre-drive circuit 308 is used to filter, level convert, and power amplify the control signal output by the MCU circuit 307, and provide the power switch device in the H-bridge circuit 303 with a control signal that conforms to its driving characteristics. The overcurrent and overvoltage detection circuit 309 is used to monitor the current and voltage of the first socket 305 in real time, and when an overcurrent and / or overvoltage condition is detected, a signal is sent to the MCU circuit 307 to trigger the MCU circuit 307 to perform a protection operation. In some possible implementations, the protection operation performed by the MCU circuit may include: controlling the H-bridge circuit 303 to cut off the output, reduce the output power, etc., so as to protect the socket itself and the electrical equipment connected to the first socket, and avoid the electrical equipment from being damaged due to overcurrent and overvoltage.

[0077] like Figure 4AAs shown, in one embodiment, the H-bridge circuit includes: a first MOS transistor QS1, a second MOS transistor QS2, a third MOS transistor QS3, a fourth MOS transistor QS4, a first half-bridge driver chip U1 and a second half-bridge driver chip U2. The drain of QS1 is connected to the positive pole of the power supply, and the source of QS1 is connected to the drain of QS3; the drain of QS2 is connected to the positive pole of the power supply, the source of QS2 is connected to the drain of QS4, the source of QS3 is grounded, and the source of QS4 is grounded; the high-side drive signal output pin of U1 is connected to the gate of QS1, and the low-side drive signal output pin of U1 is connected to the gate of QS3, and U1 is used to control the conduction and cutoff of QS1 and QS3; the high-side drive signal output pin of U2 is connected to the gate of QS2, and the low-side drive signal output pin of U2 is connected to the gate of QS4, and U2 is used to control the conduction and cutoff of QS2 and QS4; under the coordinated control of U1 and U2, by adjusting the conduction and cutoff timing of QS1, QS2, QS3 and QS4, the direct current output by the DC-DC first step-down circuit is converted into alternating current matching the target frequency and target voltage value.

[0078] like Figure 4A As shown, in one embodiment, the sine wave calibration circuit connected to the output end of the H-bridge circuit includes: a first inductor L1 and a first capacitor C1, the first inductor L1 and the first capacitor C1 constitute an LC resonant circuit, one end of the first inductor L1 is connected to the connection point of the source of the first MOS tube and the drain of the third MOS tube in the H-bridge circuit, the other end of the first inductor L1 is connected to the neutral line of the first socket and one end of the first capacitor C1; the other end of the first capacitor C1 is connected to the live line of the first socket and the connection point of the source of QS2 and the drain of QS4.

[0079] like Figure 4B As shown, in one embodiment, the DC-DC first buck circuit includes: a first switch tube Q1, a second switch tube Q2, a second inductor L2 and a second capacitor C2; wherein the second switch tube Q2 is a MOS tube with a low on-resistance characteristic, one end of the first switch tube Q1 is connected to the output end VBUS+ of the rectifier and filter circuit, the other end of the first switch tube Q1 is connected to one end of the second inductor L2 and the drain of the second switch tube Q2, the other end of the second inductor L2 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is grounded; a line is led out at the connection point of the second inductor L2 and the second capacitor C2 as an output end; when the first switch tube Q1 is turned off and the circuit enters the freewheeling stage, the second switch tube Q2 provides a freewheeling path for the current of the second inductor L2.

[0080] The DC-DC first buck circuit provided by this solution is conducive to improving buck efficiency, reducing energy loss, enhancing circuit stability, and ensuring efficient operation of the entire socket power supply system. It should be noted that in the conventional technical solutions in this field, the second switch tube of the buck circuit often uses a freewheeling diode. This solution uses a MOS tube with low on-resistance characteristics to reduce the conduction loss in the freewheeling stage compared to the freewheeling diode, especially in low output voltage (such as below 1V) or high current scenarios, the efficiency can be improved by 5%~15%.

[0081] It should be noted that, for some possible implementations, the socket may also include other branches, such as: a branch from the AC power supply to the Type C socket, a branch from the AC power supply to the USB socket, and a branch from the AC power supply to the 220V socket, which are not shown in the drawings of some embodiments of the present application. During actual implementation, they can be configured as needed. The specific circuit corresponding to these branches can adopt circuits that implement related functions, and this part of the circuit will not be repeated here.

[0082] The above embodiments of the utility model are merely examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description, such as the positions of each module are not fixed and cannot be changed. It is impossible to list all implementation methods here. All obvious changes or modifications derived from the technical solution of the utility model are still within the scope of protection of the utility model.

Claims

1. A socket, comprising: A rectifier and filter circuit and a DC-DC first step-down circuit electrically connected, the rectifier and filter circuit is used to rectify and filter the input AC power and convert it into DC power with a first preset voltage value; the DC-DC first step-down circuit is used to step down the DC power output by the rectifier and filter circuit to obtain DC power with a second preset voltage value; it is characterized in that the socket also includes: an H-bridge circuit, a sine wave calibration circuit and a first socket electrically connected to the output end of the DC-DC first step-down circuit in sequence, and a control circuit electrically connected to the rectifier and filter circuit and the H-bridge circuit; wherein, The control circuit is used to control the H-bridge circuit to convert the direct current output by the DC-DC first step-down circuit into alternating current matching a target frequency and a target voltage value, wherein the target frequency and the target voltage value match a standard frequency and a standard voltage value specified by a power supply system of a target country / region; and at least one of the target frequency and the target voltage value is different from a frequency and a voltage value of the input mains power; The sine wave calibration circuit is used to perform waveform correction and amplitude adjustment on the alternating current output by the H-bridge circuit so as to make it conform to the waveform parameters of the standard sine wave and the standard frequency and the standard voltage value of the power supply system of the target country / region; The structure and electrical parameters of the first socket meet the plug-in requirements of electrical equipment under the power supply system of the target country / region.

2. The socket according to claim 1, characterized in that: The control circuit comprises: a DC-DC second step-down circuit and an MCU circuit; The DC-DC second step-down circuit is used to step down the direct current output by the rectifier and filter circuit to provide the MCU circuit with a voltage that matches its working requirements; The MCU circuit is used to generate a control signal to control the H-bridge circuit to convert the direct current output by the DC-DC first step-down circuit into alternating current with the target frequency and the target voltage value.

3. The socket according to claim 2, characterized in that: The socket further comprises: an H-bridge pre-drive circuit, wherein the H-bridge pre-drive circuit is electrically connected to the MCU circuit and the H-bridge circuit respectively; The H-bridge pre-drive circuit is used to filter, level-convert and power-amplify the control signal output by the MCU circuit, and provide the power switch device in the H-bridge circuit with a control signal that meets its driving characteristics.

4. The socket according to claim 3, characterized in that: The socket further comprises: an overcurrent and overvoltage detection circuit, wherein the overcurrent and overvoltage detection circuit are electrically connected to the MCU circuit and the first socket respectively; The overcurrent and overvoltage detection circuit is used to monitor the current and voltage of the first socket in real time. When overcurrent and / or overvoltage is detected, a signal is sent to the MCU circuit to trigger the MCU circuit to perform a protection operation.

5. The socket according to any one of claims 1 to 4, characterized in that: The DC-DC first step-down circuit includes: a first switch tube, a second switch tube, a second inductor and a second capacitor; wherein the second switch tube is a MOS tube with a low on-resistance characteristic, one end of the first switch tube is connected to the output end of the rectifier and filter circuit, the other end of the first switch tube is connected to one end of the second inductor and the drain of the second switch tube, the other end of the second inductor is connected to one end of the second capacitor, and the other end of the second capacitor is grounded; a line is led out at the connection point of the second inductor and the second capacitor as an output end; when the first switch tube is turned off and the circuit enters the freewheeling stage, the second switch tube provides a freewheeling path for the current of the second inductor.

6. The socket according to claim 5, characterized in that: The H-bridge circuit comprises: a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a first half-bridge driver chip and a second half-bridge driver chip; The drain of the first MOS tube is connected to the positive electrode of the power supply, and the source of the first MOS tube is connected to the drain of the third MOS tube; the drain of the second MOS tube is connected to the positive electrode of the power supply, and the source of the second MOS tube is connected to the drain of the fourth MOS tube, the source of the third MOS tube is grounded, and the source of the fourth MOS tube is grounded; The high-side drive signal output pin of the first half-bridge driver chip is connected to the gate of the first MOS tube, the low-side drive signal output pin of the first half-bridge driver chip is connected to the gate of the third MOS tube, and the first half-bridge driver chip is used to control the conduction and cutoff of the first MOS tube and the third MOS tube; the high-side drive signal output pin of the second half-bridge driver chip is connected to the gate of the second MOS tube, the low-side drive signal output pin of the second half-bridge driver chip is connected to the gate of the fourth MOS tube, and the second half-bridge driver chip is used to control the conduction and cutoff of the second MOS tube and the fourth MOS tube; Under the coordinated control of the first half-bridge driver chip and the second half-bridge driver chip, the direct current output by the DC-DC first step-down circuit is converted into alternating current with the target frequency and the target voltage value by regulating the on and off timings of the first MOS tube, the second MOS tube, the third MOS tube and the fourth MOS tube.

7. The socket according to claim 6, characterized in that: The output end of the H-bridge circuit is connected to a sine wave calibration circuit, which includes: a first inductor and a first capacitor, wherein the first inductor and the first capacitor constitute an LC resonant circuit, wherein one end of the first inductor is connected to a connection point between a source of the first MOS tube and a drain of the third MOS tube in the H-bridge circuit, and the other end of the first inductor is connected to a neutral line of the first socket and one end of the first capacitor; and the other end of the first capacitor is connected to a live line of the first socket and a connection point between a source of the second MOS tube and a drain of the fourth MOS tube.

8. The socket according to any one of claims 1 to 4, characterized in that: The socket also includes: A first circuit for converting input AC power into a first circuit adapted to the output specification of the Type C socket, and a Type C socket connected to the first circuit; and / or, A second circuit for converting input AC power into output specifications adapted to a USB socket, and a USB socket connected to the second circuit.

9. The socket according to any one of claims 1 to 4, characterized in that: The socket also includes: A third circuit for converting input mains power into an electrical device adapted to the input mains power, and a socket adapted to the input mains power standard electrically connected to the third circuit.

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