Multi-phase alternating current power supply control circuit and solid-state relay

Abstract

The invention relates to a multi-phase alternating current power supply control circuit and a solid-state relay, the circuit comprises at least one MOSFET circuit and at least one gate pole driving power supply circuit correspondingly connected with the MOSFET circuit, and the MOSFET circuit is connected in series in any phase of alternating current power supply access; the circuit also comprises an input control circuit, an MOSFET drive circuit and a zero crossing point detection circuit. The zero crossing point detection circuit is connected with the multi-phase AC power supply access. The zero crossing point detection circuit outputs a zero crossing point signal when the multi-phase alternating current output by the multi-phase alternating current power supply path passes through a zero point; the MOSFET driving circuit controls the gate driving power supply circuit to provide a driving power supply signal to the corresponding MOSFET circuit based on an enable signal sent by the input control circuit under the triggering of the zero crossing point signal; the MOSFET circuit controls the conduction of the corresponding AC power supply path based on the driving power supply signal, and solves the problem that the impact current in the circuit on-off process is too large, which is not beneficial to the long-term use of the MOSFET.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a multi-phase AC power supply control circuit and a solid-state relay. Background Art

[0002] In the field of power electronics, contactors are generally used for power-on control of high-power equipment, which have the advantages of low cost, mature technology, and simple control methods. However, in some sub-segments, the shortcomings of contactors have hindered their application, such as large size, high noise, large start-stop impact current, and high power consumption. As MOSFET (metal oxide semiconductor field effect transistor) has evolved from silicon (Si) materials to silicon carbide (SiC) materials, MOSFET devices have the advantages of high thermal conductivity, high critical breakdown electric field and high carrier mobility, low power consumption and high efficiency, making them widely used. At present, MOSFET devices are mainly used in the DC field, such as MOSFET-based DC solid-state relays and SiC-based MOSFET applications in electric vehicles. For two-phase and three-phase AC power supply circuits, since the voltage and current values ​​at the moment of circuit conduction are uncertain, it is possible that the current value is at the peak value when the circuit is turned on, resulting in excessive impact current during the circuit on-off process, which is not conducive to the long-term use of MOSFET. Summary of the invention

[0003] In this embodiment, a multi-phase AC power supply control circuit and a solid-state relay are provided to solve the problem in the related art that the impact current during the circuit switching process is too large, which is not conducive to the long-term use of MOSFET.

[0004] In a first aspect, a multi-phase AC power supply control circuit is provided in this embodiment, the circuit comprising at least one MOSFET circuit and at least one gate drive power supply circuit correspondingly connected to the MOSFET circuit, the MOSFET circuit being connected in series in any phase AC power supply path; the circuit further comprising an input control circuit, a MOSFET drive circuit and a zero-crossing detection circuit, the zero-crossing detection circuit being connected to the multi-phase AC power supply path; The zero-crossing detection circuit outputs a zero-crossing signal when the multi-phase AC power supply path outputs the multi-phase AC power supply path through the zero point; The MOSFET driving circuit, under the triggering of the zero-crossing signal, controls the gate driving power supply circuit to provide a driving power supply signal to the corresponding MOSFET circuit based on the enable signal sent by the input control circuit; The MOSFET circuit controls the corresponding AC power supply path to be turned on based on the driving power signal.

[0005] In some embodiments, the MOSFET drive circuit includes a trigger, which outputs an on-off control signal corresponding to the enable signal when receiving the zero-crossing signal, and the on-off control signal is used to turn on or off the connection between the gate drive power supply circuit and the corresponding MOSFET circuit.

[0006] In some of the embodiments, the gate drive power circuit outputs the drive power signal through transformer isolation, and the ground of the gate drive power circuit is connected to the source of the MOSFET in the corresponding MOSFET circuit.

[0007] In some embodiments, the multi-phase AC power supply path includes a first-phase power supply path and a second-phase power supply path, and the zero-crossing detection circuit includes a resistor R4, a resistor R5 and a bidirectional optocoupler chip U1, one end of the resistor R4 is connected to the input end of the first-phase power supply path, the other end of the resistor R4 is connected to the first end of the bidirectional optocoupler chip U1, the second end of the bidirectional optocoupler chip U1 is connected to the input end of the second-phase power supply path, the third end of the bidirectional optocoupler chip U1 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U1 outputs the zero-crossing signal and is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded.

[0008] In some embodiments, the multi-phase AC power supply control circuit includes a first MOSFET circuit and a first gate drive power supply circuit. The first MOSFET circuit is connected in series between the input end and the output end of the first phase power supply path, the ground of the first gate drive power supply circuit is connected to the source of the first MOSFET circuit, and the input end and the output end of the second phase power supply path are directly connected; The MOSFET driving circuit includes a D trigger U2, an optocoupler chip U3, a light emitting diode LED1 and a resistor R9, the clock end of the D trigger U2 is connected to the zero-crossing signal, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the anode of the input end of the optocoupler chip U3, the cathode of the input end of the optocoupler chip U3 is grounded through the light emitting diode LED1 and the resistor R9, and the collector of the output end of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit G -1, the output end emitter output signal G-CTRL1 of the optical coupling chip U3 is connected to the gate of the first MOSFET circuit.

[0009] In some of the embodiments, the multi-phase AC power supply control circuit includes a first MOSFET circuit, a second MOSFET circuit, a first gate drive power supply circuit, and a second gate drive power supply circuit; The first MOSFET circuit is connected in series between the input end and the output end of the first phase power supply path, and the ground of the first gate drive power supply circuit is connected to the source of the first MOSFET circuit; the second MOSFET circuit is connected in series between the input end and the output end of the second phase power supply path, and the ground of the second gate drive power supply circuit is connected to the source of the second MOSFET circuit; The MOSFET driving circuit includes a D trigger U2, an optocoupler chip U3, an optocoupler chip U4, a light emitting diode LED1 and a resistor R9, wherein the clock end of the D trigger U2 is connected to the zero-crossing signal, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the anode of the input end of the optocoupler chip U3, the cathode of the input end of the optocoupler chip U3 is connected to the anode of the input end of the optocoupler chip U4, and the cathode of the input end of the optocoupler chip U4 is grounded through the light emitting diode LED1 and the resistor R9; the collector of the output end of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit G -1, the output end emitter output signal G-CTRL1 of the optical coupling chip U3 is connected to the gate of the first MOSFET circuit; the output end collector of the optical coupling chip U4 is connected to the driving power supply signal V output by the second gate driving power supply circuit G -2, the output end emitter output signal G-CTRL2 of the optocoupler chip U4 is connected to the gate of the second MOSFET circuit.

[0010] In some embodiments, the multi-phase AC power supply path includes a first-phase power supply path, a second-phase power supply path, and a third-phase power supply path. The zero-crossing detection circuit includes a resistor R4, a resistor R5, resistors R10~R13, a bidirectional optocoupler chip U1, and a bidirectional optocoupler chip U7. One end of the resistor R4 is connected to the input end of the first-phase power supply path, the other end of the resistor R4 is connected to the first end of the bidirectional optocoupler chip U1, the second end of the bidirectional optocoupler chip U1 is connected to the input end of the second-phase power supply path, the third end of the bidirectional optocoupler chip U1 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U1 outputs a zero-crossing signal TRIG-1 and is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded; One end of the resistor R10 is connected to the input end of the third-phase power supply path, the other end of the resistor R10 is connected to the first end of the bidirectional optocoupler chip U7, the second end of the bidirectional optocoupler chip U7 is connected to the input end of the first-phase power supply path through the resistor R11, and is connected to the input end of the second-phase power supply path through the resistor R12; the third end of the bidirectional optocoupler chip U7 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U7 outputs the zero-crossing signal TRIG-2 and is connected to one end of the resistor R13, and the other end of the resistor R13 is grounded; wherein the resistance values ​​of the resistor R10, the resistor R11 and the resistor R12 are the same.

[0011] In some of the embodiments, the multi-phase AC power supply control circuit includes a first MOSFET circuit, a second MOSFET circuit, a third MOSFET circuit, a first gate drive power circuit, a second gate drive power circuit, and a third gate drive power circuit; The first MOSFET circuit is connected in series between the input end and the output end of the first phase power supply path, and the ground of the first gate drive power supply circuit is connected to the source of the first MOSFET circuit; the second MOSFET circuit is connected in series between the input end and the output end of the second phase power supply path, and the ground of the second gate drive power supply circuit is connected to the source of the second MOSFET circuit; the third MOSFET circuit is connected in series between the input end and the output end of the third phase power supply path, and the ground of the third gate drive power supply circuit is connected to the source of the third MOSFET circuit; The MOSFET driving circuit includes a D trigger U2, a D trigger U5, an optocoupler chip U3, an optocoupler chip U4, an optocoupler chip U6, a light emitting diode LED1, a light emitting diode LED2, a resistor R9, and a resistor R14. The clock end of the D trigger U2 is connected to the zero-crossing signal TRIG-1, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the D end of the D trigger U5 and the input anode of the optocoupler chip U3, the input cathode of the optocoupler chip U3 is connected to the input anode of the optocoupler chip U4, and the input cathode of the optocoupler chip U4 is grounded through the light emitting diode LED1 and the resistor R9; the output collector of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit G -1, the output end emitter output signal G-CTRL1 of the optical coupling chip U3 is connected to the gate of the first MOSFET circuit; the output end collector of the optical coupling chip U4 is connected to the driving power supply signal V output by the second gate driving power supply circuitG -2, the output end emitter output signal G-CTRL2 of the optical coupling chip U4 is connected to the gate of the second MOSFET circuit; The clock end of the D flip-flop U5 is connected to the zero-crossing signal TRIG-2, the power end of the D flip-flop U5 is connected to the power supply VDD, the GND end of the D flip-flop U5 is grounded, the output end of the D flip-flop U5 is connected to the anode of the input end of the optocoupler chip U6, the cathode of the input end of the optocoupler chip U6 is grounded through the light-emitting diode LED2 and the resistor R14, and the collector of the output end of the optocoupler chip U6 is connected to the driving power signal V output by the third gate driving power circuit. G -3, the output end emitter output signal G-CTRL3 of the optocoupler chip U6 is connected to the gate of the third MOSFET circuit.

[0012] In some of the embodiments, the multi-phase AC power supply control circuit includes a second MOSFET circuit, a third MOSFET circuit, a second gate drive power circuit, and a third gate drive power circuit; The second MOSFET circuit is connected in series between the input end and the output end of the second phase power supply path, and the ground of the second gate drive power supply circuit is connected to the source of the second MOSFET circuit; the third MOSFET circuit is connected in series between the input end and the output end of the third phase power supply path, and the ground of the third gate drive power supply circuit is connected to the source of the third MOSFET circuit; the input end and the output end of the first phase power supply path are directly connected; The MOSFET driving circuit includes a D trigger U2, a D trigger U5, an optocoupler chip U4, an optocoupler chip U6, a light emitting diode LED1, a light emitting diode LED2, a resistor R9, and a resistor R14. The clock end of the D trigger U2 is connected to the zero-crossing signal TRIG-1, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the D end of the D trigger U5 and the anode of the input end of the optocoupler chip U4, and the cathode of the input end of the optocoupler chip U4 is grounded through the light emitting diode LED1 and the resistor R9; the collector of the output end of the optocoupler chip U4 is connected to the driving power signal V output by the second gate driving power circuit. G -2, the output end emitter output signal G-CTRL2 of the optical coupling chip U4 is connected to the gate of the second MOSFET circuit; The clock end of the D flip-flop U5 is connected to the zero-crossing signal TRIG-2, the power end of the D flip-flop U5 is connected to the power supply VDD, the GND end of the D flip-flop U5 is grounded, the output end of the D flip-flop U5 is connected to the anode of the input end of the optocoupler chip U6, the cathode of the input end of the optocoupler chip U6 is grounded through the light-emitting diode LED2 and the resistor R14, and the collector of the output end of the optocoupler chip U6 is connected to the driving power signal V output by the third gate driving power circuit. G -3, the output end emitter output signal G-CTRL3 of the optocoupler chip U6 is connected to the gate of the third MOSFET circuit.

[0013] In a second aspect, a solid-state relay is provided in this embodiment, and the solid-state relay includes the multi-phase AC power supply control circuit as described in the first aspect.

[0014] Compared with the related art, the multi-phase AC power supply control circuit provided in the present embodiment outputs a zero-crossing signal through a zero-crossing detection circuit when the multi-phase AC power outputted by the multi-phase AC power supply path passes through the zero point; under the triggering of the zero-crossing signal, the MOSFET drive circuit controls the gate drive power supply circuit to provide a drive power supply signal to the corresponding MOSFET circuit based on the enable signal sent by the input control circuit; the MOSFET circuit controls the corresponding AC power supply path to be turned on based on the drive power supply signal, that is, by detecting the zero-crossing moment of the AC power, the corresponding AC power supply path is controlled to be turned on or off at the zero-crossing moment, thereby suppressing the impact current during the on-off process, solving the problem that the impact current during the on-off process of the circuit is too large, which is not conducive to the long-term use of the MOSFET, and effectively protecting the MOSFET device and the load.

[0015] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 is a connection diagram of a multi-phase AC power supply control circuit in some embodiments of the present application; Figure 2 is a schematic diagram of a MOSFET circuit of some embodiments of the present application; Figure 3 It is a connection diagram of a MOSFET circuit and a gate drive power supply circuit in a two-phase (L1, L2) AC power supply control circuit of Embodiment 1 of the present application; Figure 4 This is a schematic diagram of a first zero-crossing detection circuit in Embodiment 1 of the present application; Figure 5 is a schematic diagram of an input control circuit and a first MOSFET driving circuit of Embodiment 1 of the present application; Figure 6 It is a connection diagram of a MOSFET circuit and a gate drive power supply circuit in a two-phase (L1, L2) AC power supply control circuit of Embodiment 2 of the present application; Figure 7 This is a schematic diagram of the input control circuit and the second MOSFET drive circuit of the second embodiment of the present application; Figure 8 It is a connection diagram of a MOSFET circuit and a gate drive power supply circuit in a three-phase (L1, L2, L3) AC power supply control circuit of Embodiment 3 of the present application; Fig. 9 This is a schematic diagram of a second zero-crossing detection circuit of Embodiment 3 of the present application; Fig.10 is a schematic diagram of an input control circuit and a third MOSFET driving circuit of Embodiment 3 of the present application; Fig.11 It is a connection diagram of a MOSFET circuit and a gate drive power supply circuit in a three-phase (L1, L2, L3) AC power supply control circuit of a fourth embodiment of the present application; Fig.12 This is a schematic diagram of the input control circuit and the fourth MOSFET drive circuit of the fourth embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with general skills in the technical field to which this application belongs. The words "one", "a", "the", "these" and the like in this application do not indicate a quantitative limitation, and they may be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone. Generally, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0019] Figure 1 This is a connection diagram of a multi-phase AC power supply control circuit in some embodiments of the present application. Figure 1 As shown, the multi-phase AC power supply control circuit includes at least one MOSFET circuit 11 and at least one gate drive power supply circuit 14 correspondingly connected to the MOSFET circuit. The MOSFET circuit 11 is connected in series in any phase AC power supply path ( Figure 1 2 AC power supply paths, 2 MOSFET circuits and corresponding 2 gate drive power supply circuits are shown in FIG); the multi-phase AC power supply control circuit also includes an input control circuit 17, a MOSFET drive circuit 16 and a zero-crossing detection circuit 15, and the zero-crossing detection circuit 15 is connected to the input terminals L1 to LN of the multi-phase AC power supply path. Those skilled in the art can understand that Figure 1 The structure shown is only for illustration and does not limit the structure of the multi-phase AC power supply control circuit. Figure 1 More AC phases, and more or less MOSFET circuits 11 and gate drive power supply circuits 14 are shown.

[0020] The zero-crossing detection circuit 15 outputs a zero-crossing signal when the multi-phase AC power output by the multi-phase AC power supply path passes through the zero point; the MOSFET drive circuit 16, under the triggering of the zero-crossing signal, controls the gate drive power circuit 14 to provide a drive power signal to the corresponding MOSFET circuit 11 based on the enable signal sent by the input control circuit 17; the MOSFET circuit 11 controls the corresponding AC power supply path to be turned on based on the drive power signal.

[0021] The multi-phase AC power supply control circuit of this embodiment may include a two-phase (L1, L2) AC power supply control circuit and a three-phase (L1, L2, L3) AC power supply control circuit. The number of MOSFET circuits 11 and gate drive power supply circuits 14 may be less than or equal to the number of phases of the AC power. Specifically, when the AC power is two-phase, the number of MOSFET circuits 11 and gate drive power supply circuits 14 may be 1 or 2; when the AC power is three-phase, the number of MOSFET circuits 11 and gate drive power supply circuits 14 may be 2 or 3. The MOSFET circuit 11 may be connected in series between the input terminal L1~LN and the corresponding output terminal O1~ON of any phase AC power supply path.

[0022] The zero-crossing detection circuit 15 is connected to the input terminals L1 to LN of each phase AC power supply path, and detects whether the multi-phase AC passes through the zero point according to the voltage of each phase AC, and outputs a zero-crossing signal when passing through the zero point. The input control circuit 17 can convert the external input control signal into an enable signal that matches the voltage level of the subsequent circuit and forms a certain signal isolation. The control signal is in a valid state when the low level is low and in an invalid state when the high level is high; the enable signal is in an invalid state when the low level is low and in a valid state when the high level is high.

[0023] When the enable signal changes from invalid to valid, the MOSFET drive circuit 16 is triggered by the zero-crossing signal to control the gate drive power circuit 14 to provide a drive power signal to the corresponding MOSFET circuit 11, and the drive power signal is used to control the conduction of the corresponding AC power supply path; when the enable signal changes from valid to invalid, the MOSFET drive circuit 16 is triggered by the zero-crossing signal to control the gate drive power circuit 14 to stop providing the drive power signal to the corresponding MOSFET circuit 11, and the corresponding AC power supply path is disconnected.

[0024] The multi-phase AC power supply control circuit provided in this embodiment detects the zero-crossing moment of the AC power and controls the corresponding AC power supply path to be turned on or off when the AC power passes through the zero point, thereby suppressing the impact current during the on-off process, solving the problem that the impact current during the on-off process of the circuit is too large, which is not conducive to the long-term use of MOSFET, and effectively protecting the MOSFET device and the load.

[0025] In some embodiments, the MOSFET driving circuit 16 includes a trigger, which outputs an on-off control signal corresponding to the enable signal when receiving a zero-crossing signal. The on-off control signal is used to turn on or off the connection between the gate driving power supply circuit 14 and the corresponding MOSFET circuit 11.

[0026] The trigger in this embodiment can be a D trigger, which includes a clock terminal, a D input terminal and a Q output terminal, wherein the clock terminal is connected to a zero-crossing signal, the D input terminal is connected to an enable signal, and the Q output terminal outputs an on-off control signal. When the enable signal connected to the D input terminal is at a high level, when the zero-crossing signal is received, the high-level signal of the D input terminal is output to the Q output terminal, and the on-off control signal is at a high level. The high-level on-off control signal is used to control the connection between the gate drive power supply circuit 14 and the corresponding MOSFET circuit 11, provide a drive power supply signal, and turn on the corresponding AC power supply path.

[0027] When the enable signal connected to the D input terminal is at a low level, when a zero-crossing signal is received, the low-level signal of the D input terminal is output to the Q output terminal, and the on-off control signal is at a low level. The low-level on-off control signal is used to control the disconnection between the gate drive power circuit 14 and the corresponding MOSFET circuit 11. The gate drive power circuit 14 stops providing the drive power signal to the corresponding MOSFET circuit 11, thereby disconnecting the corresponding AC power supply path.

[0028] In some embodiments, the gate drive power circuit 14 outputs a drive power signal through transformer isolation, and the ground of the gate drive power circuit 14 is connected to the source of the MOSFET in the corresponding MOSFET circuit 11 .

[0029] The gate drive power supply circuit 14 is used to provide a gate drive voltage to the corresponding MOSFET circuit 11. Since the field effect tube is turned on and off by the voltage between the source and the gate, and the source in the MOSFET circuit 11 is in a floating state, an independent power supply is required. The gate drive power supply circuit 14 can be configured to generate a drive power supply signal after being isolated by a transformer. By connecting the ground of the gate drive power supply circuit 14 to the source of the MOSFET in the MOSFET circuit 11, the drive power supply signal output by the gate drive power supply circuit 14 can be applied to the gate of the MOSFET of the corresponding MOSFET circuit 11 to achieve conduction control.

[0030] Specifically, Figure 2 Schematic diagram of MOSFET circuits of some embodiments of the present application. Figure 2As shown, the MOSFET circuit 11 includes two MOSFET devices T1 and MOSFET device T2 connected back to back, as well as a capacitor C1, a resistor R2, a resistor R3 and a varistor R1. The source S of T1 is connected to the source S of T2, the gate G of T1 is connected to the gate G of T2, and the source S and the gate G are connected through the resistor R3; the capacitor C1 is connected in series with the resistor R2 and then connected between the drain D of T1 and the drain D of T2, and is connected in parallel with the varistor R1; the drain D of T1 is connected to the input end of the MOSFET circuit 11, and the drain D of T2 is connected to the output end of the MOSFET circuit 11.

[0031] The semiconductor device makes no sound when turned on and off, and is voltage driven, so it has the advantages of low noise and low power consumption. In order to achieve bidirectional on and off control, the source S of T1 is connected to the source S of T2, and the common end after connection serves as the source of MOSFET circuit 11. The gate G of T1 is connected to the gate G of T2, and the gate G and the source S are connected through a resistor R3. In order to protect T1 and T2, the safety capacitor C1 is connected in series with the resistor R2 and then connected in parallel between the drain D of T1 and the drain D of T2, and the varistor R1 is connected in parallel between the drain D of T1 and the drain D of T2. The drain D of T1 is connected to the input end of the MOSFET circuit 11, and the drain D of T2 is connected to the output end of the MOSFET circuit 11.

[0032] Embodiment 1: Figure 3 Schematic diagram of the connection between the MOSFET circuit and the gate drive power supply circuit in the two-phase (L1, L2) AC power supply control circuit of the first embodiment of the present application, such as Figure 3 As shown, the multi-phase AC power supply control circuit of this embodiment includes a first MOSFET circuit 1 and a first gate drive power supply circuit 4, and the multi-phase AC power supply path includes a first-phase power supply path and a second-phase power supply path. The first MOSFET circuit 1 is connected in series between the input terminal L1 and the output terminal O1 of the first-phase power supply path, the ground Gs-1 of the first gate drive power supply circuit 4 is connected to the source S of the first MOSFET circuit 1, and the input terminal L2 of the second-phase power supply path is directly connected to the output terminal O2.

[0033] The multi-phase AC power supply control circuit of this embodiment further includes an input control circuit 7, a first MOSFET driving circuit and a first zero-crossing detection circuit. Figure 4 is a schematic diagram of the first zero-crossing detection circuit of the first embodiment of the present application, such as Figure 4As shown, the first zero-crossing detection circuit includes a resistor R4, a resistor R5 and a bidirectional optocoupler chip U1. One end of the resistor R4 is connected to the input end L1 of the first-phase power supply path, the other end of the resistor R4 is connected to the first end of the bidirectional optocoupler chip U1, the second end of the bidirectional optocoupler chip U1 is connected to the input end L2 of the second-phase power supply path, the third end of the bidirectional optocoupler chip U1 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U1 outputs the zero-crossing signal TRIG-1 and is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded.

[0034] The first zero-crossing detection circuit is used to detect the voltage zero-crossing point, and outputs a zero-crossing signal TRIG-1 each time L1 and L2 pass through a zero-crossing point.

[0035] Figure 5 : is a schematic diagram of the input control circuit and the first MOSFET driving circuit of the first embodiment of the present application, such as Figure 5 As shown, the first MOSFET driving circuit includes a D trigger U2, an optocoupler chip U3, a light emitting diode LED1 and a resistor R9, the clock terminal CLK of the D trigger U2 is connected to the zero-crossing signal TRIG-1, the D input terminal of the D trigger U2 is connected to the input control circuit 7, the power supply terminal VCC of the D trigger U2 is connected to the power supply VDD, the GND terminal of the D trigger U2 is grounded, the Q output terminal of the D trigger U2 is connected to the anode of the input terminal of the optocoupler chip U3, the cathode of the input terminal of the optocoupler chip U3 is grounded through the light emitting diode LED1 and the resistor R9, and the collector of the output terminal of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit 4 G -1, the output end emitter output signal G-CTRL1 of the optocoupler chip U3 is connected to the gate S of the first MOSFET circuit 1.

[0036] like Figure 5 As shown, the input control circuit 7 includes resistors R6, R7, R8 and transistor Q1, wherein the transistor Q1 is a PNP transistor. The external control signal CTRL is connected to the base of the transistor Q1 through the resistor R7, the emitter of the transistor Q1 is connected to the power supply VDD, the resistor R6 is connected in parallel between the base and the emitter of the transistor Q1, the collector of the transistor Q1 is connected to the resistor R8, and the other end of the resistor R8 is grounded.

[0037] The input control circuit 7 is used to convert the external control signal CTRL into the voltage level required by the subsequent circuit and form a certain signal isolation; when the external control signal CTRL is at a low level, the PNP transistor Q1 is turned on and the collector outputs a high level. When the external control signal CTRL is valid (low level), the D input terminal of the D flip-flop U2 is at a high level, but it needs to wait until the zero-crossing signal TRIG-1 provides a jump signal before the Q output terminal of the D flip-flop U2 becomes valid, outputs the high level of the D terminal to the Q output terminal, and turns on the optocoupler chip U3, and the output V G -1 is applied to the gate of the first MOSFET circuit 1 through the emitter to control the conduction of the AC power supply path, while the light emitting diode LED1 provides a visual display of the conduction state.

[0038] When the external control signal CTRL changes from valid to invalid (high level or high impedance state), the zero-crossing signal TRIG-1 is also required to trigger, turn off the optocoupler chip U3, disconnect the first gate drive power circuit 4 from the first MOSFET circuit 1, and control the AC power supply path to be disconnected.

[0039] In this embodiment, the input terminal L1 of the first phase power supply path is connected to the output terminal O1 through the first MOSFET circuit 1, and the input terminal L2 of the second phase power supply path is directly connected to the output terminal O2, so as to realize the operation control of the load.

[0040] Embodiment 2: Figure 6 : is a connection diagram of the MOSFET circuit and the gate drive power supply circuit in the two-phase (L1, L2) AC power supply control circuit of the second embodiment of the present application, such as Figure 6 As shown, the multi-phase AC power supply control circuit of this embodiment includes a first MOSFET circuit 1, a second MOSFET circuit 2, a first gate drive power supply circuit 4, and a second gate drive power supply circuit 5. The multi-phase AC power supply path includes a first-phase power supply path and a second-phase power supply path. The first MOSFET circuit 1 is connected in series between the input terminal L1 and the output terminal O1 of the first-phase power supply path, and the ground Gs-1 of the first gate drive power supply circuit 4 is connected to the source S of the first MOSFET circuit 1; the second MOSFET circuit 2 is connected in series between the input terminal L2 and the output terminal O2 of the second-phase power supply path, and the ground Gs-2 of the second gate drive power supply circuit 5 is connected to the source S of the second MOSFET circuit 2.

[0041] The multi-phase AC power supply control circuit of this embodiment also includes an input control circuit, a second MOSFET drive circuit and a first zero-crossing detection circuit. The first zero-crossing detection circuit is consistent with the first zero-crossing detection circuit of the first embodiment. Every time L1 and L2 pass through a zero-crossing point, the emitter of the bidirectional optocoupler chip U1 will output a zero-crossing signal TRIG-1. The input control circuit is consistent with the input control circuit 7 of the first embodiment.

[0042] Figure 7 : is a schematic diagram of the input control circuit and the second MOSFET drive circuit of the second embodiment of the present application, such as Figure 7 As shown, the second MOSFET driving circuit includes a D trigger U2, an optocoupler chip U3, an optocoupler chip U4, a light-emitting diode LED1 and a resistor R9, the clock terminal CLK of the D trigger U2 is connected to the zero-crossing signal TRIG-1, the D input terminal of the D trigger U2 is connected to the input control circuit, the power supply terminal VCC of the D trigger U2 is connected to the power supply VDD, the GND terminal of the D trigger U2 is grounded, the Q output terminal of the D trigger U2 is connected to the anode of the input terminal of the optocoupler chip U3, the cathode of the input terminal of the optocoupler chip U3 is connected to the anode of the input terminal of the optocoupler chip U4, and the cathode of the input terminal of the optocoupler chip U4 is grounded through the light-emitting diode LED1 and the resistor R9; the collector of the output terminal of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit 4 G -1, the output end emitter output signal G-CTRL1 of the optocoupler chip U3 is connected to the gate of the first MOSFET circuit 1; the output end collector of the optocoupler chip U4 is connected to the driving power supply signal V output by the second gate driving power supply circuit 5 G -2, the output end emitter output signal G-CTRL2 of the optocoupler chip U4 is connected to the gate of the second MOSFET circuit 2.

[0043] The first MOSFET circuit 1 and the first gate drive power supply circuit 4 in this embodiment are respectively consistent with the first MOSFET circuit 1 and the first gate drive power supply circuit 4 in Example 1. The second MOSFET circuit 2 in this embodiment is consistent with the first MOSFET circuit 1, and the second gate drive power supply circuit 5 is consistent with the first gate drive power supply circuit 4.

[0044] When the control signal CTRL is valid (low level), the D input terminal of the D flip-flop U2 is high level. When the zero-crossing signal TRIG-1 provides a jump signal, the Q output terminal of the D flip-flop U2 becomes valid, and the high level of the D input terminal is output to the Q output terminal of the D flip-flop U2, turning on the optocoupler chips U3 and U4. At this time, the output V G -1 is applied to the gate of the first MOSFET circuit 1 through the output emitter of the optocoupler chip U3, and the output VG -2 is applied to the gate of the second MOSFET circuit 2 through the output emitter of the optocoupler chip U4, controlling the corresponding AC power supply path to be turned on, while the light emitting diode LED1 provides a visual display of the conduction state.

[0045] When the control signal CTRL changes from valid to invalid (high level or high impedance state), the zero-crossing signal TRIG-1 is also required to trigger, so that the optocoupler chips U3 and U4 are turned off, and the first gate drive power circuit 4 and the second gate drive power circuit 5 stop providing the MOSFET drive power supply, resulting in the corresponding AC power supply path being disconnected.

[0046] In this embodiment, the input end L1 of the first phase power supply path is connected to the output end O1 through the first MOSFET circuit 1, and the input end L2 of the second phase power supply path is connected to the output end O2 through the second MOSFET circuit 2, which can achieve comprehensive control of the output ends O1 and O2 and improve the safety of AC power supply.

[0047] Embodiment three: Figure 8 : is a connection diagram of the MOSFET circuit and the gate drive power supply circuit in the three-phase (L1, L2, L3) AC power supply control circuit of the third embodiment of the present application, such as Figure 8 As shown, the multi-phase AC power supply control circuit of this embodiment includes a first MOSFET circuit 1, a second MOSFET circuit 2, a third MOSFET circuit 3, a first gate drive power supply circuit 4, a second gate drive power supply circuit 5, and a third gate drive power supply circuit 6. The multi-phase AC power supply path includes a first phase power supply path, a second phase power supply path, and a third phase power supply path.

[0048] Among them, the first MOSFET circuit 1 is connected in series between the input terminal L1 and the output terminal O1 of the first phase power supply path, and the ground Gs-1 of the first gate drive power supply circuit 4 is connected to the source S of the first MOSFET circuit 1; the second MOSFET circuit 2 is connected in series between the input terminal L2 and the output terminal O2 of the second phase power supply path, and the ground Gs-2 of the second gate drive power supply circuit 5 is connected to the source S of the second MOSFET circuit 2; the third MOSFET circuit 3 is connected in series between the input terminal L3 and the output terminal O3 of the third phase power supply path, and the ground Gs-3 of the third gate drive power supply circuit 6 is connected to the source S of the third MOSFET circuit 3.

[0049] In this embodiment, the first MOSFET circuit 1, the second MOSFET circuit 2, and the third MOSFET circuit 3 are all consistent with the first MOSFET circuit 1 of the first embodiment, and the first gate drive power supply circuit 4, the second gate drive power supply circuit 5, and the third gate drive power supply circuit 6 are all consistent with the first gate drive power supply circuit 4 of the first embodiment.

[0050] The multi-phase AC power supply control circuit of this embodiment further includes an input control circuit, a third MOSFET driving circuit and a second zero-crossing detection circuit. The input control circuit is consistent with the input control circuit 7 of the first embodiment.

[0051] Fig. 9 : is a schematic diagram of the second zero-crossing detection circuit of the third embodiment of the present application. Fig. 9 As shown, the second zero-crossing detection circuit includes a resistor R4, a resistor R5, resistors R10-R13, a bidirectional optocoupler chip U1, and a bidirectional optocoupler chip U7. One end of the resistor R4 is connected to the input end L1 of the first-phase power supply path, the other end of the resistor R4 is connected to the first end of the bidirectional optocoupler chip U1, the second end of the bidirectional optocoupler chip U1 is connected to the input end L2 of the second-phase power supply path, the third end of the bidirectional optocoupler chip U1 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U1 outputs the zero-crossing signal TRIG-1, and is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded. The zero-crossing signal TRIG-1 is a zero-crossing signal between the first-phase power supply path and the second-phase power supply path.

[0052] One end of the resistor R10 is connected to the input end L3 of the third phase power supply path, the other end of the resistor R10 is connected to the first end of the bidirectional optocoupler chip U7, the second end of the bidirectional optocoupler chip U7 is connected to the input end L1 of the first phase power supply path through the resistor R11, and is connected to the input end L2 of the second phase power supply path through the resistor R12; the third end of the bidirectional optocoupler chip U7 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U7 outputs the zero-crossing signal TRIG-2, and is connected to one end of the resistor R13, and the other end of the resistor R13 is grounded; wherein the resistance values ​​of the resistors R10, R11 and R12 are the same. The zero-crossing signal TRIG-2 is the zero-crossing signal between L3 and L1 and L2.

[0053] Fig.10 : is a schematic diagram of the input control circuit and the third MOSFET driving circuit of the third embodiment of the present application, such as Fig.10 As shown, the third MOSFET driving circuit includes a D flip-flop U2, a D flip-flop U5, an optocoupler chip U3, an optocoupler chip U4, an optocoupler chip U6, a light emitting diode LED1, a light emitting diode LED2, a resistor R9, and a resistor R14.

[0054] The clock terminal CLK of the D flip-flop U2 is connected to the zero-crossing signal TRIG-1, the D input terminal of the D flip-flop U2 is connected to the input control circuit, the power supply terminal VCC of the D flip-flop U2 is connected to the power supply VDD, the GND terminal of the D flip-flop U2 is grounded, the Q output terminal of the D flip-flop U2 is connected to the D input terminal of the D flip-flop U5 and the input anode of the optocoupler chip U3, the input cathode of the optocoupler chip U3 is connected to the input anode of the optocoupler chip U4, and the input cathode of the optocoupler chip U4 is grounded through the light-emitting diode LED1 and the resistor R9.

[0055] The output collector of the optocoupler chip U3 is connected to the drive power signal V output by the first gate drive power circuit 4. G -1, the output end emitter output signal G-CTRL1 of the optocoupler chip U3 is connected to the gate S of the first MOSFET circuit 1. The output end collector of the optocoupler chip U4 is connected to the drive power signal V output by the second gate drive power circuit 5 G -2, the output end emitter output signal G-CTRL2 of the optocoupler chip U4 is connected to the gate S of the second MOSFET circuit 2.

[0056] The clock terminal CLK of the D flip-flop U5 is connected to the zero-crossing signal TRIG-2, the power terminal VCC of the D flip-flop U5 is connected to the power supply VDD, the GND terminal of the D flip-flop U5 is grounded, the Q output terminal of the D flip-flop U5 is connected to the anode of the input terminal of the optocoupler chip U6, the cathode of the input terminal of the optocoupler chip U6 is grounded through the light-emitting diode LED2 and the resistor R14, and the collector of the output terminal of the optocoupler chip U6 is connected to the driving power signal V output by the third gate driving power circuit 6 G -3, the output end emitter output signal G-CTRL3 of the optocoupler chip U6 is connected to the gate S of the third MOSFET circuit 3.

[0057] When the control signal CTRL is valid (low level), the D input terminal of the D flip-flop U2 is high level. When the zero-crossing signal TRIG-1 provides a jump signal, the Q output terminal of the D flip-flop U2 is valid, and the high level of the D input terminal is output to the Q output terminal, and the optocoupler chips U3 and U4 are turned on, and the output V G -1 is applied to the gate of the first MOSFET circuit 1 through the emitter of the optocoupler chip U3, and the output V G -2 is applied to the gate of the second MOSFET circuit 2 through the emitter of the optocoupler chip U4, controlling the corresponding AC power supply path to be turned on. At the same time, the light-emitting diode LED1 provides a visual display of the conduction state. At this time, the two-phase power supply of L1 and L2 is turned on, and the current impact at the moment of connection is small.

[0058] Next, when the zero-crossing signal TRIG-2 provides a jump signal, the high level of the D input terminal of the D flip-flop U5 is output to the Q output terminal, and the optocoupler chip U6 is turned on, and the output V G -3 is applied to the gate of the third MOSFET circuit 3 through the emitter of the optocoupler chip U6, controlling the corresponding AC power supply path to be turned on, and at the same time the light emitting diode LED2 provides a visual display of the conduction state. At this time, the L3 power supply is turned on, and the instantaneous current impact is small.

[0059] When the control signal CTRL changes from valid to invalid (high level or high impedance state), the zero-crossing signals TRIG-1 and TRIG-2 are also required to trigger, and the optocoupler chips U3, U4 and U6 are turned off in sequence, and the three-phase output terminals O1, O2, O3 are disconnected from the power supply.

[0060] Embodiment 4: Fig.11 : is a connection diagram of the MOSFET circuit and the gate drive power supply circuit in the three-phase (L1, L2, L3) AC power supply control circuit of the fourth embodiment of the present application, such as Fig.11 As shown, the multi-phase AC power supply control circuit of this embodiment includes a second MOSFET circuit 2, a third MOSFET circuit 3, a second gate drive power supply circuit 5, and a third gate drive power supply circuit 6; the multi-phase AC power supply path includes a first phase power supply path, a second phase power supply path and a third phase power supply path.

[0061] Among them, the second MOSFET circuit 2 is connected in series between the input terminal L2 and the output terminal O2 of the second phase power supply path, and the ground Gs-2 of the second gate drive power supply circuit 5 is connected to the source S of the second MOSFET circuit 2; the third MOSFET circuit 3 is connected in series between the input terminal L3 and the output terminal O3 of the third phase power supply path, and the ground Gs-3 of the third gate drive power supply circuit 6 is connected to the source S of the third MOSFET circuit 3; the input terminal L1 of the first phase power supply path is directly connected to the output terminal O1.

[0062] In this embodiment, the second MOSFET circuit 2 and the third MOSFET circuit 3 are consistent with the first MOSFET circuit 1 of the first embodiment, and the second gate drive power supply circuit 5 and the second gate drive power supply circuit 6 are consistent with the first gate drive power supply circuit 4 of the first embodiment.

[0063] The multi-phase AC power supply control circuit of this embodiment also includes an input control circuit, a fourth MOSFET drive circuit and a second zero-crossing detection circuit. The second zero-crossing detection circuit is consistent with the second zero-crossing detection circuit of embodiment 3. The input control circuit is consistent with the input control circuit 7 of embodiment 1.

[0064] Fig.12 : is a schematic diagram of the input control circuit and the fourth MOSFET driving circuit of the fourth embodiment of the present application, such as Fig.12 As shown, the fourth MOSFET driving circuit includes a D flip-flop U2, a D flip-flop U5, an optocoupler chip U4, an optocoupler chip U6, a light emitting diode LED1, a light emitting diode LED2, a resistor R9, and a resistor R14.

[0065] The clock terminal CLK of the D flip-flop U2 is connected to the zero-crossing signal TRIG-1, the D input terminal of the D flip-flop U2 is connected to the input control circuit, the power supply terminal VCC of the D flip-flop U2 is connected to the power supply VDD, the GND terminal of the D flip-flop U2 is grounded, the Q output terminal of the D flip-flop U2 is connected to the D input terminal of the D flip-flop U5 and the anode of the input terminal of the optocoupler chip U4, and the cathode of the input terminal of the optocoupler chip U4 is grounded through the light-emitting diode LED1 and the resistor R9; the collector of the output terminal of the optocoupler chip U4 is connected to the drive power signal V output by the second gate drive power circuit 5 G -2, the output end emitter output signal G-CTRL2 of the optocoupler chip U4 is connected to the gate S of the second MOSFET circuit 2.

[0066] The clock terminal CLK of the D flip-flop U5 is connected to the zero-crossing signal TRIG-2, the power terminal VCC of the D flip-flop U5 is connected to the power supply VDD, the GND terminal of the D flip-flop U5 is grounded, the Q output terminal of the D flip-flop U5 is connected to the anode of the input terminal of the optocoupler chip U6, the cathode of the input terminal of the optocoupler chip U6 is grounded through the light-emitting diode LED2 and the resistor R14, and the collector of the output terminal of the optocoupler chip U6 is connected to the driving power signal V output by the third gate driving power circuit 6 G -3, the output end emitter output signal G-CTRL3 of the optocoupler chip U6 is connected to the gate S of the third MOSFET circuit 3.

[0067] When the control signal CTRL is valid (low level), the D terminal of the D flip-flop U2 is high level. When the zero-crossing signal TRIG-1 provides a jump signal, the Q output terminal of the D flip-flop U2 is valid, and the high level of the D input terminal is output to the Q output terminal, and the optocoupler chip U4 is turned on, and the output V G -2 is applied to the gate of the second MOSFET circuit 2 through the emitter of the optocoupler chip U4, controlling the conduction of the second phase power supply path, and at the same time the light emitting diode LED1 provides a visual display of the conduction state. At this time, L1 and L2 are powered in two phases, and the instantaneous current impact of connection is small.

[0068] Next, when the zero-crossing signal TRIG-2 provides a jump signal, the high level of the D input terminal of the D flip-flop U5 is output to the Q output terminal, and the optocoupler chip U6 is turned on, and the output VG -3 is applied to the gate of the third MOSFET circuit 3 through the emitter of the optocoupler chip U6, controlling the conduction of the third phase power supply path, and at the same time the light emitting diode LED2 provides a visual display of the conduction state. At this time, the L3 power supply is turned on, and the instantaneous current impact of the connection is small.

[0069] When the control signal CTRL changes from valid to invalid (high level or high impedance state), the zero-crossing signals TRIG-1 and TRIG-2 are also required to trigger, and the optocoupler chips U4 and U6 are turned off in sequence, and the output terminals O2 and O3 are disconnected from power supply.

[0070] In this embodiment, the input terminal L1 of the first phase power supply path is directly connected to the output terminal O1, while L2 is connected to the output terminal O2 through the second MOSFET circuit 2, and L3 is connected to the output terminal O3 through the third MOSFET circuit 3, so as to realize the operation control of the load.

[0071] Some embodiments of the present application further provide a solid-state relay, which includes the multi-phase AC power supply control circuit in the above-mentioned embodiment.

[0072] The solid-state relay of this embodiment is suitable for two-phase and three-phase AC power supply circuits. By detecting the zero-crossing moment of the AC power, the corresponding AC power supply path is controlled to be turned on or off when the AC power passes through the zero point, thereby suppressing the impact current during the on-off process, solving the problem of excessive impact current during the on-off process of the circuit, which is not conducive to the long-term use of MOSFET, and effectively protecting the MOSFET device and the load.

[0073] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementation modes, and will not be repeated in this embodiment.

[0074] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0075] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0076] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0077] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A multi-phase AC power supply control circuit, It is characterized in that The circuit includes at least one MOSFET circuit and at least one gate drive power supply circuit corresponding to the MOSFET circuit, wherein the MOSFET circuit is connected in series in any phase AC power supply path; the circuit also includes an input control circuit, a MOSFET drive circuit and a zero-crossing detection circuit, wherein the zero-crossing detection circuit is connected to the multi-phase AC power supply path; The zero-crossing detection circuit outputs a zero-crossing signal when the multi-phase AC power supply path outputs the multi-phase AC power supply path through the zero point; The MOSFET driving circuit, under the triggering of the zero-crossing signal, controls the gate driving power supply circuit to provide a driving power supply signal to the corresponding MOSFET circuit based on the enable signal sent by the input control circuit; The MOSFET circuit controls the corresponding AC power supply path to be turned on based on the driving power signal.

2. The multi-phase AC power supply control circuit according to claim 1, It is characterized in that The MOSFET drive circuit includes a trigger, which outputs an on-off control signal corresponding to the enable signal when receiving the zero-crossing signal, and the on-off control signal is used to turn on or off the connection between the gate drive power supply circuit and the corresponding MOSFET circuit.

3. The multi-phase AC power supply control circuit according to claim 1, It is characterized in that The gate drive power circuit outputs the drive power signal through transformer isolation, and the ground of the gate drive power circuit is connected to the source of the MOSFET in the corresponding MOSFET circuit.

4. The multi-phase AC power supply control circuit according to any one of claims 1 to 3, It is characterized in that The multi-phase AC power supply path includes a first-phase power supply path and a second-phase power supply path, and the zero-crossing detection circuit includes a resistor R4, a resistor R5 and a bidirectional optocoupler chip U1, one end of the resistor R4 is connected to the input end of the first-phase power supply path, the other end of the resistor R4 is connected to the first end of the bidirectional optocoupler chip U1, the second end of the bidirectional optocoupler chip U1 is connected to the input end of the second-phase power supply path, the third end of the bidirectional optocoupler chip U1 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U1 outputs the zero-crossing signal and is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded.

5. The multi-phase AC power supply control circuit according to claim 4, It is characterized in that The multi-phase AC power supply control circuit includes a first MOSFET circuit and a first gate drive power supply circuit. The first MOSFET circuit is connected in series between the input end and the output end of the first phase power supply path, the ground of the first gate drive power supply circuit is connected to the source of the first MOSFET circuit, and the input end and the output end of the second phase power supply path are directly connected; The MOSFET driving circuit includes a D trigger U2, an optocoupler chip U3, a light emitting diode LED1 and a resistor R9, the clock end of the D trigger U2 is connected to the zero-crossing signal, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the anode of the input end of the optocoupler chip U3, the cathode of the input end of the optocoupler chip U3 is grounded through the light emitting diode LED1 and the resistor R9, and the collector of the output end of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit G -1, the output end emitter output signal G-CTRL1 of the optical coupling chip U3 is connected to the gate of the first MOSFET circuit.

6. The multi-phase AC power supply control circuit according to claim 4, It is characterized in that The multi-phase AC power supply control circuit includes a first MOSFET circuit, a second MOSFET circuit, a first gate drive power supply circuit, and a second gate drive power supply circuit; The first MOSFET circuit is connected in series between the input end and the output end of the first phase power supply path, and the ground of the first gate drive power supply circuit is connected to the source of the first MOSFET circuit; the second MOSFET circuit is connected in series between the input end and the output end of the second phase power supply path, and the ground of the second gate drive power supply circuit is connected to the source of the second MOSFET circuit; The MOSFET driving circuit includes a D trigger U2, an optocoupler chip U3, an optocoupler chip U4, a light emitting diode LED1 and a resistor R9, wherein the clock end of the D trigger U2 is connected to the zero-crossing signal, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the anode of the input end of the optocoupler chip U3, the cathode of the input end of the optocoupler chip U3 is connected to the anode of the input end of the optocoupler chip U4, and the cathode of the input end of the optocoupler chip U4 is grounded through the light emitting diode LED1 and the resistor R9; the collector of the output end of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit G -1, the output end emitter output signal G-CTRL1 of the optical coupling chip U3 is connected to the gate of the first MOSFET circuit; the output end collector of the optical coupling chip U4 is connected to the driving power supply signal V output by the second gate driving power supply circuit G -2, the output end emitter output signal G-CTRL2 of the optocoupler chip U4 is connected to the gate of the second MOSFET circuit.

7. The multi-phase AC power supply control circuit according to any one of claims 1 to 3, It is characterized in that The multi-phase AC power supply path includes a first-phase power supply path, a second-phase power supply path, and a third-phase power supply path. The zero-crossing detection circuit includes a resistor R4, a resistor R5, resistors R10-R13, a bidirectional optocoupler chip U1, and a bidirectional optocoupler chip U7. One end of the resistor R4 is connected to the input end of the first-phase power supply path, the other end of the resistor R4 is connected to the first end of the bidirectional optocoupler chip U1, the second end of the bidirectional optocoupler chip U1 is connected to the input end of the second-phase power supply path, the third end of the bidirectional optocoupler chip U1 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U1 outputs a zero-crossing signal TRIG-1 and is connected to one end of the resistor R5, and the other end of the resistor R5 is grounded; One end of the resistor R10 is connected to the input end of the third-phase power supply path, the other end of the resistor R10 is connected to the first end of the bidirectional optocoupler chip U7, the second end of the bidirectional optocoupler chip U7 is connected to the input end of the first-phase power supply path through the resistor R11, and is connected to the input end of the second-phase power supply path through the resistor R12; the third end of the bidirectional optocoupler chip U7 is connected to the power supply VDD, the fourth end of the bidirectional optocoupler chip U7 outputs the zero-crossing signal TRIG-2 and is connected to one end of the resistor R13, and the other end of the resistor R13 is grounded; wherein the resistance values ​​of the resistor R10, the resistor R11 and the resistor R12 are the same.

8. The multi-phase AC power supply control circuit according to claim 7, It is characterized in that The multi-phase AC power supply control circuit includes a first MOSFET circuit, a second MOSFET circuit, a third MOSFET circuit, a first gate drive power circuit, a second gate drive power circuit, and a third gate drive power circuit; The first MOSFET circuit is connected in series between the input end and the output end of the first phase power supply path, and the ground of the first gate drive power supply circuit is connected to the source of the first MOSFET circuit; the second MOSFET circuit is connected in series between the input end and the output end of the second phase power supply path, and the ground of the second gate drive power supply circuit is connected to the source of the second MOSFET circuit; the third MOSFET circuit is connected in series between the input end and the output end of the third phase power supply path, and the ground of the third gate drive power supply circuit is connected to the source of the third MOSFET circuit; The MOSFET driving circuit includes a D trigger U2, a D trigger U5, an optocoupler chip U3, an optocoupler chip U4, an optocoupler chip U6, a light emitting diode LED1, a light emitting diode LED2, a resistor R9, and a resistor R14. The clock end of the D trigger U2 is connected to the zero-crossing signal TRIG-1, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the D end of the D trigger U5 and the input anode of the optocoupler chip U3, the input cathode of the optocoupler chip U3 is connected to the input anode of the optocoupler chip U4, and the input cathode of the optocoupler chip U4 is grounded through the light emitting diode LED1 and the resistor R9; the output collector of the optocoupler chip U3 is connected to the driving power signal V output by the first gate driving power circuit G -1, the output end emitter output signal G-CTRL1 of the optical coupling chip U3 is connected to the gate of the first MOSFET circuit; the output end collector of the optical coupling chip U4 is connected to the driving power supply signal V output by the second gate driving power supply circuit G -2, the output end emitter output signal G-CTRL2 of the optical coupling chip U4 is connected to the gate of the second MOSFET circuit; The clock end of the D flip-flop U5 is connected to the zero-crossing signal TRIG-2, the power end of the D flip-flop U5 is connected to the power supply VDD, the GND end of the D flip-flop U5 is grounded, the output end of the D flip-flop U5 is connected to the anode of the input end of the optocoupler chip U6, the cathode of the input end of the optocoupler chip U6 is grounded through the light-emitting diode LED2 and the resistor R14, and the collector of the output end of the optocoupler chip U6 is connected to the driving power signal V output by the third gate driving power circuit. G -3, the output end emitter output signal G-CTRL3 of the optocoupler chip U6 is connected to the gate of the third MOSFET circuit.

9. The multi-phase AC power supply control circuit according to claim 7, It is characterized in that The multi-phase AC power supply control circuit includes a second MOSFET circuit, a third MOSFET circuit, a second gate drive power supply circuit, and a third gate drive power supply circuit; The second MOSFET circuit is connected in series between the input end and the output end of the second phase power supply path, and the ground of the second gate drive power supply circuit is connected to the source of the second MOSFET circuit; the third MOSFET circuit is connected in series between the input end and the output end of the third phase power supply path, and the ground of the third gate drive power supply circuit is connected to the source of the third MOSFET circuit; the input end and the output end of the first phase power supply path are directly connected; The MOSFET driving circuit includes a D trigger U2, a D trigger U5, an optocoupler chip U4, an optocoupler chip U6, a light emitting diode LED1, a light emitting diode LED2, a resistor R9, and a resistor R14. The clock end of the D trigger U2 is connected to the zero-crossing signal TRIG-1, the D end of the D trigger U2 is connected to the input control circuit, the power end of the D trigger U2 is connected to the power supply VDD, the GND end of the D trigger U2 is grounded, the output end of the D trigger U2 is connected to the D end of the D trigger U5 and the anode of the input end of the optocoupler chip U4, and the cathode of the input end of the optocoupler chip U4 is grounded through the light emitting diode LED1 and the resistor R9; the collector of the output end of the optocoupler chip U4 is connected to the driving power signal V output by the second gate driving power circuit. G -2, the output end emitter output signal G-CTRL2 of the optical coupling chip U4 is connected to the gate of the second MOSFET circuit; The clock end of the D flip-flop U5 is connected to the zero-crossing signal TRIG-2, the power end of the D flip-flop U5 is connected to the power supply VDD, the GND end of the D flip-flop U5 is grounded, the output end of the D flip-flop U5 is connected to the anode of the input end of the optocoupler chip U6, the cathode of the input end of the optocoupler chip U6 is grounded through the light-emitting diode LED2 and the resistor R14, and the collector of the output end of the optocoupler chip U6 is connected to the driving power signal V output by the third gate driving power circuit. G -3, the output end emitter output signal G-CTRL3 of the optocoupler chip U6 is connected to the gate of the third MOSFET circuit.

10. A solid state relay, It is characterized in that The solid-state relay includes a multi-phase AC power supply control circuit as described in any one of claims 1 to 9.

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