Device for surge control and open-phase detection

Abstract

The invention discloses a device for surge control and open-phase detection, and relates to the technical field of measurement. The motor driving circuit comprises a controller, a working power supply circuit, a motor driving circuit, a second diode D2, a charging switching circuit, a third electrolytic capacitor E3, a bus voltage detection circuit and a current detection circuit, wherein the motor driving circuit comprises first to sixth transistors M1 to M6 and first to third coils L1 to L3 of a motor; through the current detection circuit, the controller controls the opening degree of the transistor, so that the value of current entering a motor coil is controlled, a third electrolytic capacitor E3 can be stably charged, the coil in the motor is used for restraining surge, and the effect is better and more stable; and meanwhile, the bus voltage detection circuit is used for detecting the states of the power supply and the motor, and once the open-phase condition is detected, the controller can immediately take measures to give out an open-phase alarm.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, and in particular to a device for surge control and phase loss detection. Background Art

[0002] Generally, whether it is 220V or 380V, there is a need for surge suppression. The general method of surge suppression is to add an NTC or resistor in front to suppress the surge current rushing into the DC bus capacitor. Because the power is getting bigger and bigger, frequent start and stop cause the NTC or surge suppression resistor to heat up seriously, which can easily be damaged.

[0003] like Fig.11 As shown, the current common single-phase surge control is to limit the current through the NTC resistor R1. However, due to improper use by customers, the time from power failure to next power-on is not long enough, which will lead to insufficient heat dissipation time for the resistor R1, and the temperature of the resistor R1 is too high, which will eventually be damaged due to overpower.

[0004] like Fig.12 As shown, ordinary three-phase surge suppression uses the NTC resistor R2 to limit the current. However, due to improper use by the customer, the time from power failure to the next power-on is not long enough, which will lead to insufficient heat dissipation time for the resistor R2, and the temperature of the resistor R2 is too high, which will eventually be damaged due to overpower.

[0005] How to curb surges has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The invention provides a device for surge control and phase loss detection, which solves the technical problem of poor surge suppression effect.

[0007] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0008] A device for surge control and phase loss detection comprises a controller, a working power supply circuit, a motor drive circuit, a second diode D2, a charging switching circuit, a third electrolytic capacitor E3, a bus voltage detection circuit and a current detection circuit. The motor drive circuit comprises first to sixth transistors M1-M6 and first to third coils L1-L3 of the motor. The control end of the controller is electrically connected to the gate of each transistor separately, and the control end JDQ of the controller is electrically connected to the control end of the charging switching circuit; the collector of the first transistor M1, the collector of the second transistor M2 and the collector of the third transistor M3 are electrically connected, the emitter of the first transistor M1 is electrically connected to the collector of the fourth transistor M4, the emitter of the second transistor M2 is electrically connected to the collector of the fifth transistor M5, the emitter of the third transistor M3 is electrically connected to the collector of the sixth transistor M6, the emitter of the fourth transistor M4, the emitter of the fifth transistor M5 and the emitter of the sixth transistor M6 are electrically connected, one end of the first coil L1, one end of the second coil L2 and one end of the third coil L3 are electrically connected, and the other end of the first coil L1 is electrically connected to the first transistor M1 The emitter of the second coil L2 is electrically connected, the other end of the second coil L2 is electrically connected to the emitter of the second transistor M2, and the other end of the third coil L3 is electrically connected to the emitter of the third transistor M3; the input end of the power supply circuit is used to be electrically connected to the output end P1+ of the AC-DC converter circuit, the output end VCC of the power supply circuit is electrically connected to the controller and the charging switching circuit respectively, the collector of the first transistor M1 is electrically connected to the input end of the working power supply circuit; the emitter of the first transistor M1 is electrically connected to the anode of the second diode D2, and the cathode of the second diode D2 is electrically connected to the charging switching circuit in turn. The normally closed contact of the charging switching circuit and the third electrolytic capacitor E3 are grounded GND, one end of the normally open contact of the charging switching circuit is grounded GND via the third electrolytic capacitor E3, and the other end of the normally open contact of the charging switching circuit is electrically connected to the input end of the power supply circuit; the input end of the bus voltage detection circuit is electrically connected to the third electrolytic capacitor E3 on the charging switching circuit side, the sampling end of the bus voltage detection circuit is electrically connected to the input end VDC of the controller, the sampling end of the current detection circuit is electrically connected to the emitter of the fifth transistor M5, and the output end of the current detection circuit is electrically connected to the current sampling end of the controller.

[0009] A further technical solution is that the charging switching circuit includes a relay RLY1, a third diode D3 and a sixth resistor R6, the contact 3 and the contact 5 of the relay RLY1 form a normally closed contact, the contact 2 and the contact 5 of the relay RLY1 form a normally open contact, the cathode of the second diode D2 is electrically connected to the contact 3 of the relay RLY1, the contact 1 of the relay RLY1 is electrically connected to the output terminal VCC of the power supply circuit and the cathode of the third diode D3 respectively, the anode of the third diode D3 is electrically connected to the contact 4 of the relay RLY1, the contact 4 of the relay RLY1 is electrically connected to the control terminal JDQ of the controller via the sixth resistor R6, the contact 5 of the relay RLY1 is grounded GND via the third electrolytic capacitor E3, the contact 2 of the relay RLY1 is electrically connected to the collector of the first transistor M1, and the contact 2 of the relay RLY1 is used to be electrically connected to the output terminal P1+ of the AC-to-DC circuit.

[0010] A further technical solution is that the working power supply circuit includes a power supply circuit, a first diode D1, a first electrolytic capacitor E1 and a second electrolytic capacitor E2, the cathode of the first diode D1 is electrically connected to the input end of the power supply circuit, the input end of the power supply circuit is grounded GND via the first electrolytic capacitor E1, the output end VCC of the power supply circuit is grounded GND via the second electrolytic capacitor E2, the anode of the first diode D1 is the input end of the working power supply circuit, and the output end VCC of the power supply circuit is the output end of the working power supply circuit.

[0011] A further technical solution is that: the controller includes a single-chip computer U1, a transistor QA1, a tenth resistor R10 and a third capacitor C3, the control terminal JDQ of the single-chip computer U1 is electrically connected to the base of the transistor QA1 via the tenth resistor R10, the base of the transistor QA1 is grounded GND via the third capacitor C3, the emitter of the transistor QA1 is grounded GND, and the collector of the transistor QA1 is electrically connected to the control terminal of the charging switching circuit; the control terminal UH of the single-chip computer U1 is electrically connected to the gate of the first transistor M1, and the control terminal VH of the single-chip computer U1 is electrically connected to the gate of the second transistor The gate of M2 is electrically connected, the control terminal WH of the single-chip computer U1 is electrically connected to the gate of the third transistor M3, the control terminal UL of the single-chip computer U1 is electrically connected to the gate of the fourth transistor M4, the control terminal VL of the single-chip computer U1 is electrically connected to the gate of the fifth transistor M5, and the control terminal WL of the single-chip computer U1 is electrically connected to the gate of the sixth transistor M6; the first current sampling terminal OPA2_IP of the single-chip computer U1 is electrically connected to the first output terminal of the current detection circuit, and the second current sampling terminal OPA2_IN of the single-chip computer U1 is electrically connected to the second output terminal of the current detection circuit.

[0012] A further technical solution is that the bus voltage detection circuit includes first to fifth resistors R1~R5 and a first capacitor C1, the third electrolytic capacitor E3 on the charging switching circuit side is electrically connected to the input terminal VDC of the controller via the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 in sequence, the input terminal VDC of the controller is grounded GND via the first capacitor C1, and the junction of the third resistor R3 and the fourth resistor R4 is grounded GND via the fifth resistor R5.

[0013] A further technical solution is that: the current detection circuit includes the seventh to ninth resistors R7~R9 and the second capacitor C2, the current sampling end of the controller includes the first current sampling end OPA2_IP and the second current sampling end OPA2_IN, the first current sampling end OPA2_IP of the controller is connected to the ground GND via the eighth resistor R8 and the seventh resistor R7 in sequence, the second current sampling end OPA2_IN of the controller is connected to the ground GND via the ninth resistor R9, the second capacitor C2 is electrically connected between the first current sampling end OPA2_IP and the second current sampling end OPA2_IN of the controller, the junction of the eighth resistor R8 and the second capacitor C2 is the first output end of the current detection circuit, and the junction of the ninth resistor R9 and the second capacitor C2 is the second output end of the current detection circuit; the junction of the seventh resistor R7 and the eighth resistor R8 is electrically connected to the emitter of the fifth transistor M5, the seventh resistor R7 is a sampling resistor, and the junction of the seventh resistor R7 and the eighth resistor R8 is the sampling end of the current detection circuit.

[0014] A further technical solution is: it also includes an AC-DC converter, and the input end of the power supply circuit is electrically connected to the output end P1+ of the AC-DC converter.

[0015] A further technical solution is that the AC-to-DC circuit is a single-phase AC-to-DC circuit, the single-phase AC-to-DC circuit includes a single-phase rectifier bridge BR1, a varistor MOV1 and a fuse FUSE1, one end of the single-phase AC power supply is electrically connected to contact 1 of the single-phase rectifier bridge BR1 via the fuse FUSE1, the other end of the single-phase AC power supply is electrically connected to contact 3 of the single-phase rectifier bridge BR1, the varistor MOV1 is electrically connected between contacts 1 and 3 of the single-phase rectifier bridge BR1, contact 2 of the single-phase rectifier bridge BR1 is the output end P1+ of the single-phase AC-to-DC circuit, and contact 4 of the single-phase rectifier bridge BR1 is grounded GND.

[0016] A further technical solution is that: the AC-to-DC circuit is a three-phase AC-to-DC circuit, and also includes a fourth electrolytic capacitor E4, which is connected between the third electrolytic capacitor E3 and the ground GND; the three-phase AC-to-DC circuit includes a three-phase rectifier bridge BR2, a first varistor MOV1, a second varistor MOV2, a third varistor MOV3 and a gas discharge tube DSA1, a first end L1 of the three-phase AC power supply is electrically connected to a contact 1 of the three-phase rectifier bridge BR2, a second end L2 of the three-phase AC power supply is electrically connected to a contact 2 of the three-phase rectifier bridge BR2, a third end L3 of the three-phase AC power supply is electrically connected to a contact 3 of the three-phase rectifier bridge BR2, one end of the first varistor MOV1 is electrically connected to the three-phase rectifier bridge BR2, and one end of the first varistor MOV1 is electrically connected to the three-phase rectifier bridge BR2. The contact 1 of the three-phase rectifier bridge BR2 is electrically connected, the other end of the first varistor MOV1 is electrically connected to the contact 3 of the three-phase rectifier bridge BR2 via the third varistor MOV3, one end of the second varistor MOV2 is electrically connected to the contact 2 of the three-phase rectifier bridge BR2, the other end of the second varistor MOV2 is connected to the junction of the first varistor MOV1 and the third varistor MOV3, one end of the gas discharge tube DSA1 is connected to the junction of the first varistor MOV1 and the third varistor MOV3, the other end of the gas discharge tube DSA1 is grounded EARTH, the contact 5 of the three-phase rectifier bridge BR2 is the output terminal P1+ of the three-phase AC to DC conversion circuit, and the contact 4 of the three-phase rectifier bridge BR2 is grounded GND.

[0017] The beneficial effects of adopting the above technical solution are:

[0018] A device for surge control and phase loss detection comprises a controller, a working power supply circuit, a motor drive circuit, a second diode D2, a charging switching circuit, a third electrolytic capacitor E3, a bus voltage detection circuit and a current detection circuit. The motor drive circuit comprises first to sixth transistors M1-M6 and first to third coils L1-L3 of the motor. The controller controls a transistor to conduct, controls the opening of the transistor to control the current value entering the motor coil, and then can charge the third electrolytic capacitor E3 steadily, and utilizes the coil in the motor to suppress surge, with better and more stable effect.

[0019] Furthermore, during the process of the controller controlling a transistor to conduct charging, the controller monitors and obtains the charging voltage on the third electrolytic capacitor E3. If the charging voltage is normal, it is known that the charging circuit corresponding to the coil is normal, thereby achieving corresponding phase loss detection.

[0020] Furthermore, the controller controls the transistor to turn off, and the current in the corresponding coil is discharged. The controller monitors and obtains the change process of the sampled current. If the change process is normal, the controller obtains the corresponding current to ensure the size of the transistor opening during the next charging.

[0021] Please refer to the detailed description of the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a circuit diagram of embodiment 1 of the present invention;

[0023] Figure 2 yes Figure 1 State diagram of current flow in the first charging circuit when single-phase AC is in positive direction;

[0024] Figure 3 yes Figure 1 The state diagram of the current flow in the first charging circuit when the single-phase AC is reversed;

[0025] Figure 4 yes Figure 1 State diagram of current flow in the single-phase AC first current detection circuit;

[0026] Figure 5 yes Figure 1 The state diagram of the current flow in the second charging circuit when the single-phase AC is in the forward direction;

[0027] Figure 6 yes Figure 1 The state diagram of the current flow in the second charging circuit when the single-phase AC is reversed;

[0028] Figure 7 yes Figure 1 State diagram of current flow in the single-phase AC second current detection circuit;

[0029] Figure 8 is a circuit schematic diagram of embodiment 2 of the present invention;

[0030] Fig. 9 yes Figure 8 State diagram of current flow in the first three-phase AC charging circuit;

[0031] Fig.10 yes Figure 8 The state diagram of the current flow in the first current detection circuit of the three-phase AC;

[0032] Fig.11 It is a circuit schematic diagram of a single-phase AC surge suppression circuit in the prior art;

[0033] Fig.12 The invention is a circuit principle diagram of a three-phase AC surge suppression circuit in the prior art. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] Embodiment 1:

[0037] like Figure 1 As shown, the present invention discloses a device for surge control and phase loss detection, including a controller, a working power supply circuit, a motor drive circuit, a second diode D2, a charging switching circuit, a third electrolytic capacitor E3, a bus voltage detection circuit and a current detection circuit. The working power supply circuit includes a power supply circuit, a first diode D1, a first electrolytic capacitor E1 and a second electrolytic capacitor E2. The cathode of the first diode D1 is electrically connected to the input end of the power supply circuit, the input end of the power supply circuit is grounded GND via the first electrolytic capacitor E1, the output end VCC of the power supply circuit is grounded GND via the second electrolytic capacitor E2, the anode of the first diode D1 is the input end of the working power supply circuit, and the output end VCC of the power supply circuit is the output end of the working power supply circuit.

[0038] When in use, the input end of the working power supply circuit is electrically connected to the output end P1+ of the single-phase AC to DC conversion circuit.

[0039] The single-phase AC-to-DC circuit includes a single-phase rectifier bridge BR1, a varistor MOV1 and a fuse FUSE1. One end of the single-phase AC power supply is electrically connected to a contact 1 of the single-phase rectifier bridge BR1 via the fuse FUSE1, and the other end of the single-phase AC power supply is electrically connected to a contact 3 of the single-phase rectifier bridge BR1. The varistor MOV1 is electrically connected between contacts 1 and 3 of the single-phase rectifier bridge BR1. Contact 2 of the single-phase rectifier bridge BR1 is the output end P1+ of the single-phase AC-to-DC circuit, and contact 4 of the single-phase rectifier bridge BR1 is grounded GND.

[0040] The controller includes a single-chip computer U1, a transistor QA1, a tenth resistor R10 and a third capacitor C3. The control end JDQ of the single-chip computer U1 is electrically connected to the base of the transistor QA1 via the tenth resistor R10. The base of the transistor QA1 is grounded GND via the third capacitor C3. The emitter of the transistor QA1 is grounded GND. The collector of the transistor QA1 is electrically connected to the control end of the charging switching circuit. The collector of the transistor QA1 is the control end of the controller, which is used to control the normally closed contact in the charging switching circuit to switch to the normally open contact, thereby switching from the charging state to the normal working state.

[0041] The motor drive circuit includes first to sixth transistors M1-M6 and first to third coils L1-L3 of the motor, a control terminal UH of the single-chip microcomputer U1 is electrically connected to the gate of the first transistor M1, a control terminal VH of the single-chip microcomputer U1 is electrically connected to the gate of the second transistor M2, a control terminal WH of the single-chip microcomputer U1 is electrically connected to the gate of the third transistor M3, a control terminal UL of the single-chip microcomputer U1 is electrically connected to the gate of the fourth transistor M4, a control terminal VL of the single-chip microcomputer U1 is electrically connected to the gate of the fifth transistor M5, and a control terminal WL of the single-chip microcomputer U1 is electrically connected to the gate of the sixth transistor M6; the collector of the first transistor M1, the collector of the second transistor M2 and the collector of the third transistor M3 are electrically connected and form an input terminal of the motor drive circuit, and the emitter of the first transistor M1 is electrically connected to the collector of the fourth transistor M4 , the emitter of the second transistor M2 is electrically connected to the collector of the fifth transistor M5, the emitter of the third transistor M3 is electrically connected to the collector of the sixth transistor M6, the emitter of the fourth transistor M4, the emitter of the fifth transistor M5 and the emitter of the sixth transistor M6 are electrically connected to form a sampling terminal IF of the motor drive circuit, one end of the first coil L1, one end of the second coil L2 and one end of the third coil L3 are electrically connected to form a common end of the coils, the other end of the first coil L1 is electrically connected to the emitter of the first transistor M1 and forms a junction U, the other end of the second coil L2 is electrically connected to the emitter of the second transistor M2 and forms a junction V, the other end of the third coil L3 is electrically connected to the emitter of the third transistor M3 and forms a junction W, and the emitter of the first transistor M1 is the output end of the motor drive circuit. The collector of the first transistor M1 is electrically connected to the anode of the first diode D1, that is, the input end of the motor drive circuit is electrically connected to the input end of the working power supply circuit.

[0042] The contact 1 of each transistor is the gate, the contact 2 is the collector, and the contact 3 is the emitter.

[0043] An anode of the second diode D2 is electrically connected to the emitter of the first transistor M1 .

[0044] The charging switching circuit includes a relay RLY1, a third diode D3 and a sixth resistor R6, a contact 1 of the relay RLY1 is electrically connected to the output end VCC of the power supply circuit, a contact 1 of the relay RLY1 is electrically connected to the cathode of the third diode D3, a contact 2 of the relay RLY1 is electrically connected to the output end P1+ of the single-phase AC to DC conversion circuit, that is, a contact 2 of the relay RLY1 is electrically connected to the input end of the motor drive circuit and the input end of the working power supply circuit, a contact 4 of the relay RLY1 is electrically connected to the anode of the third diode D3, a contact 4 of the relay RLY1 is electrically connected to the collector of the transistor QA1 via the sixth resistor R6, and a junction of the sixth resistor R6 and the collector of the transistor QA1 is a control end of the charging switching circuit; a contact 3 of the relay RLY1 is electrically connected to the cathode of the second diode D2, a contact 5 of the relay RLY1 is grounded GND via the third electrolytic capacitor E3, and a contact 5 of the relay RLY1 is an output end P2+ of the charging switching circuit.

[0045] The bus voltage detection circuit includes first to fifth resistors R1~R5 and a first capacitor C1. The contact 5 of the relay RLY1 is electrically connected to the input terminal VDC of the single-chip computer U1 via the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 in sequence. The input terminal VDC of the single-chip computer U1 is grounded GND via the first capacitor C1, the junction of the third resistor R3 and the fourth resistor R4 is grounded GND via the fifth resistor R5, and the junction of the fourth resistor R4 and the first capacitor C1 is the bus voltage sampling terminal VDC.

[0046] The current detection circuit includes seventh to ninth resistors R7~R9 and a second capacitor C2. The first current sampling terminal OPA2_IP of the single-chip computer U1 is connected to the ground GND via the eighth resistor R8 and the seventh resistor R7 in sequence. The second current sampling terminal OPA2_IN of the single-chip computer U1 is connected to the ground GND via the ninth resistor R9. The second capacitor C2 is electrically connected between the first current sampling terminal OPA2_IP and the second current sampling terminal OPA2_IN of the single-chip computer U1. The junction of the seventh resistor R7 and the eighth resistor R8 is electrically connected to the emitter of the fifth transistor M5. The seventh resistor R7 is a sampling resistor. The junction of the seventh resistor R7 and the eighth resistor R8 is the sampling terminal of the current detection circuit, that is, the sampling terminal of the current detection circuit is electrically connected to the sampling terminal IF of the motor drive circuit.

[0047] illustrate:

[0048] Generally speaking, there are three aspects of current limiting: the first aspect is the impedance of the resistor, the second aspect is the inductive reactance of the inductor, and the third aspect is the capacitive reactance of the capacitor. The circuit of this application uses the inductive reactance of the motor to limit the current.

[0049] The circuit of the present application utilizes the coil in the motor to suppress the surge.

[0050] Working process of embodiment 1:

[0051] Step S1: the first charging and current detection step.

[0052] like Figure 2 to Figure 4 The figure shows the state diagram of the first charging and detection process.

[0053] Step S101: charging and powering on for the first time.

[0054] like Figure 2 As shown, when the power is turned on and the single-phase AC is in the forward direction, the contact 2 of the single-phase rectifier bridge BR1 outputs a DC voltage P1+ to the input end of the working power supply circuit, and the output end of the working power supply circuit outputs the microcontroller working voltage VCC to the microcontroller U1. The microcontroller U1 starts to work after being powered on, and the control end VH of the microcontroller U1 is set to a high level, and the control ends UH, WH, UL, VL and WL of the microcontroller U1 are set to a low level. The control end VH of the microcontroller U1 controls the second transistor M2 to be turned on with an initially set opening value, and the current of the L phase of the single-phase AC power supply flows through the contact 1 of the single-phase rectifier bridge BR1, the contact 2 of the single-phase rectifier bridge BR1, the second transistor M2, the second coil L2, the first coil L1, the second diode D2, and the relay RLY1 in sequence. Contact 3 and contact 5, the third electrolytic capacitor E3, contact 4 of the single-phase rectifier bridge BR1 and contact 3 of the single-phase rectifier bridge BR1 return to the N phase of the single-phase AC power supply, and are sequentially connected to contact 2 of the turned-on single-phase rectifier bridge BR1, the second transistor M2, the second coil L2, the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3 and the contact 4 of the single-phase rectifier bridge BR1 and the single-phase AC power supply to form a first charging circuit in the forward direction of the single-phase AC. The current output from contact 2 of the single-phase rectifier bridge BR1 charges the third electrolytic capacitor E3, and a bus voltage P2+ is obtained on the third electrolytic capacitor E3, that is, the output voltage of the output end P2+ of the charging switching circuit.

[0055] The output voltage of the output terminal P2+ of the charging switching circuit is divided by the bus voltage detection circuit, and the bus sampling voltage VDC is obtained at the bus voltage sampling terminal VDC of the bus voltage detection circuit, and the bus sampling voltage VDC is obtained at the input terminal VDC of the single-chip computer U1, and the voltage value is monitored in real time. The single-chip computer U1 controls the opening of the second transistor M2 according to the voltage value of the bus sampling voltage VDC, and then controls the current value in the first charging circuit, so that the current in the first charging circuit is relatively stable, and the third electrolytic capacitor E3 is charged steadily, so that the bus voltage P2+ rises slowly, and the surge is effectively suppressed.

[0056] Details are as follows:

[0057] like Figure 2As shown, on the left side of the figure, a single-phase rectifier bridge BR1 is connected between the AC terminals L and N, and the rectifier outputs a DC voltage value P1+, which is then stepped down through the working power supply circuit to obtain a voltage VCC for the single-chip microcomputer. The single-chip microcomputer working power supply VCC is the working power supply, so that the single-chip microcomputer can work normally. The DC voltage P1+ has come in, but because the third electrolytic capacitor E3 connected to the bus is behind the motor drive circuit, the third electrolytic capacitor E3 connected to the bus is not charged yet. At this time, the single-chip microcomputer working voltage VCC charges the lower bridge. Assuming that the second transistor M2 is turned on, that is, the V phase is turned on, the current flows from L→fuse FUSE1→rectifier bridge→second transistor M2→second coil L2→first coil L1→second diode D2→relay RLY1→third electrolytic capacitor E3 connected to the bus→rectifier bridge→N, and the above is the charging process. The size of this current depends on the turn-on time of the second transistor M2 on the upper bridge, which is achieved by adjusting the duty cycle of the control terminal VH of the single-chip microcomputer U1.

[0058] like Figure 3 As shown, when the single-phase AC is reversed, the contact 2 of the single-phase rectifier bridge BR1 outputs a DC voltage P1+ to the input end of the working power supply circuit, and the output end of the working power supply circuit outputs the microcontroller working voltage VCC to the microcontroller U1, the microcontroller U1 is kept powered, the control end VH of the microcontroller U1 is kept at a high level, the control ends UH, WH, UL, VL and WL of the microcontroller U1 are kept at a low level, the control end VH of the microcontroller U1 keeps controlling the second transistor M2 to be turned on, and the current of the N phase of the single-phase AC power supply flows through the contact 3 of the single-phase rectifier bridge BR1, the contact 2 of the single-phase rectifier bridge BR1, the second transistor M2, the second coil L2, the first coil L1, the second transistor M2, the second coil L3, the first coil L4, the second coil L5, the second coil L6, the second coil L7, the second coil L8, the second coil L9, the second coil L1, the second coil L1, the second coil L2, the second coil L3, the first coil L1, the second coil L2, the second coil L3, the second coil L4, the first coil L5, the second coil L6, the second coil L7, the second coil L8, the second coil L9, the second coil L9, the second coil L1, the second coil L2, the second coil L2, the first coil L2, the second ... The second diode D2, contact 3 and contact 5 of relay RLY1, the third electrolytic capacitor E3, contact 4 of the single-phase rectifier bridge BR1, and contact 1 of the single-phase rectifier bridge BR1 return to the L phase of the single-phase AC power supply, and are sequentially connected to contact 2 of the turned-on single-phase rectifier bridge BR1, the second transistor M2, the second coil L2, the first coil L1, the second diode D2, contact 3 of relay RLY1, contact 5 of relay RLY1, the third electrolytic capacitor E3 and contact 4 of the single-phase rectifier bridge BR1 and the single-phase AC power supply in series to form a first charging circuit when the single-phase AC is reversed. The current output from contact 2 of the single-phase rectifier bridge BR1 continuously charges the third electrolytic capacitor E3.

[0059] Details are as follows:

[0060] like Figure 3 As shown, there are differences on the left side of the figure, and the same parts are not repeated. The current flows from N→rectifier bridge→second transistor M2→second coil L2→first coil L1→second diode D2→relay RLY1→third electrolytic capacitor E3 connected to the busbar→rectifier bridge→fuse FUSE1→L.

[0061] Step S102: Fully charge for the first time.

[0062] The current output from contact 2 of the single-phase rectifier bridge BR1 continuously charges the third electrolytic capacitor E3. When the bus voltage P2+ obtained on the third electrolytic capacitor E3 remains stable and no longer changes, the bus sampling voltage VDC obtained at the input terminal VDC of the single-chip microcomputer U1 will also remain stable and no longer change. The single-chip microcomputer U1 compares the bus sampling voltage VDC with the bus sampling voltage threshold. When the bus sampling voltage VDC falls within the bus sampling voltage threshold range, the single-chip microcomputer U1 knows that the first charging is completed and is fully charged. The single-chip microcomputer U1 knows that the first charging circuit is connected normally during single-phase AC forward direction, and the first charging circuit is connected normally during single-phase AC reverse direction, and the conduction is normal, thereby realizing the first charging circuit detection during single-phase AC forward direction and the first charging circuit detection during single-phase AC reverse direction.

[0063] Details are as follows:

[0064] After the above process, the voltage of the third electrolytic capacitor E3 is slowly charged from 0V to the required bus voltage value. Due to the bus voltage detection, when the charging voltage no longer rises after 100MS of power-on, it is considered that the charging is completed. The length of 100MS can be adjusted as needed. This bus voltage value can be detected by the bus voltage detection circuit, and whether it is fully charged can be known by the single-chip microcomputer U1, so that the charging is completed.

[0065] Phase loss detection: If any phase of U, V, or W is missing, assuming that the current flows in from V and U is disconnected, there will be no voltage on the U phase during charging, and the bus voltage detection will not reach the preset value, indicating a phase loss. When charging, use the motor to flow current through each phase to charge the third electrolytic capacitor E3. If the capacitor voltage does not rise and there is no charging current, it means a phase loss.

[0066] Step S103: first current detection.

[0067] like Figure 4 As shown, when the single-chip computer U1 learns that the first charging is completed and fully charged, the control terminal VH of the single-chip computer U1 is set to a low level, the second transistor M2 is disconnected, the coil is discharged, and the current flows through the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the sampling resistor seventh resistor R7 of the current detection circuit, the fifth transistor M5 and the second coil L2 in sequence for circular discharge, and the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the sampling resistor seventh resistor R7 of the current detection circuit, the fifth transistor M5 and the second coil L2 are connected in sequence to form a single-phase AC first current detection loop.

[0068] The first current sampling terminal OPA2_IP and the second current sampling terminal OPA2_IN of the single-chip microcomputer U1 obtain the sampling voltage on the seventh resistor R7 of the sampling resistor of the current detection circuit, thereby obtaining the sampling current. During the coil discharge process, the single-chip microcomputer U1 obtains the sampling current in real time, and learns the change process of the sampling current. If the change process is normal, it is known that the single-phase AC first current detection loop is connected normally and the conduction is normal, thereby realizing the detection of the single-phase AC first current detection loop.

[0069] Details are as follows:

[0070] like Figure 4 As shown, when the second transistor M2 of the upper bridge is turned off, the inductor current will not change suddenly and starts to flow, from the first coil L1 → the second diode D2 → the relay RLY1 → the third electrolytic capacitor E3 connected to the bus → the sampling resistor R7 → the fifth transistor M5 → the second coil L2.

[0071] When the upper bridge is disconnected, there is no current in the upper bridge, but the lower bridge can continue to flow, because the inductor current cannot change suddenly, and the current when it is turned off is equal to the continuous current. The seventh resistor R7 is a sampling resistor, which will be connected to the control terminals OPA2_IP and OPA2_IN of the microcontroller U1 to detect the voltage. After the voltage is known, the current can be determined, and the current can be obtained by the opening time of the upper tube, so that the input current can be detected, and the surge current is suppressed by the inductive reactance, allowing the current of the bus capacitor to increase slowly.

[0072] Step S2: the second charging and current detection step.

[0073] like Figure 5 to Figure 7 The figure shows the state diagram of the second charging and detection process.

[0074] Step S201: charging and powering on for the second time.

[0075] like Figure 5As shown, when the single-chip computer U1 learns that step S1: the first charging and current detection steps are completed, the control terminal WH of the single-chip computer U1 is set to a high level, and the control terminals UH, VH, UL, VL and WL of the single-chip computer U1 remain at a low level. The control terminal WH of the single-chip computer U1 controls the third transistor M3 to be turned on at the initially set opening value, and the current of the L phase of the single-phase AC power supply flows through the contact 1 of the single-phase rectifier bridge BR1, the contact 2 of the single-phase rectifier bridge BR1, the third transistor M3, the third coil L3, the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, the third electrolytic capacitor E3, and the contact of the single-phase rectifier bridge BR1 in sequence. 4 and the contact 3 of the single-phase rectifier bridge BR1 return to the N phase of the single-phase AC power supply, and sequentially connect the contact 2 of the turned-on single-phase rectifier bridge BR1, the third transistor M3, the third coil L3, the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3 and the contact 4 of the single-phase rectifier bridge BR1 in series with the single-phase AC power supply to form a second charging circuit when the single-phase AC is in the forward direction. The current output from the contact 2 of the single-phase rectifier bridge BR1 charges the third electrolytic capacitor E3, and the bus voltage P2+ is obtained on the third electrolytic capacitor E3, that is, the output voltage of the output end P2+ of the charging switching circuit.

[0076] The output voltage of the output terminal P2+ of the charging switching circuit is divided by the bus voltage detection circuit, and the bus sampling voltage VDC is obtained at the bus voltage sampling terminal VDC of the bus voltage detection circuit, and the bus sampling voltage VDC is obtained at the input terminal VDC of the single-chip computer U1, and the voltage value is monitored in real time. The single-chip computer U1 controls the opening of the third transistor M3 according to the voltage value of the bus sampling voltage VDC, and then controls the current value in the second charging circuit, so that the current in the second charging circuit is relatively stable, and the third electrolytic capacitor E3 is charged steadily, so that the bus voltage P2+ rises slowly, and the surge is effectively suppressed.

[0077] like Figure 6As shown, when the single-phase AC is reversed, the contact 2 of the single-phase rectifier bridge BR1 outputs a DC voltage P1+ to the input end of the working power supply circuit, and the output end of the working power supply circuit outputs the microcontroller working voltage VCC to the microcontroller U1, the microcontroller U1 is kept powered, the control end WH of the microcontroller U1 is kept at a high level, the control ends UH, VH, UL, VL and WL of the microcontroller U1 are kept at a low level, the control end WH of the microcontroller U1 keeps controlling the third transistor M3 to be turned on, and the current of the N phase of the single-phase AC power supply flows through the contact 3 of the single-phase rectifier bridge BR1, the contact 2 of the single-phase rectifier bridge BR1, the third transistor M3, the third coil L3, the first coil L ... The second diode D2, contact 3 and contact 5 of relay RLY1, the third electrolytic capacitor E3, contact 4 of the single-phase rectifier bridge BR1, and contact 1 of the single-phase rectifier bridge BR1 return to the L phase of the single-phase AC power supply, and are sequentially connected to contact 2 of the turned-on single-phase rectifier bridge BR1, the third transistor M3, the third coil L3, the first coil L1, the second diode D2, contact 3 of relay RLY1, contact 5 of relay RLY1, the third electrolytic capacitor E3 and contact 4 of the single-phase rectifier bridge BR1 and the single-phase AC power supply in series to form a second charging circuit when the single-phase AC is reversed. The current output from contact 2 of the single-phase rectifier bridge BR1 continues to charge the third electrolytic capacitor E3.

[0078] Step S202: Fully charge for the second time.

[0079] The current output from contact 2 of the single-phase rectifier bridge BR1 continuously charges the third electrolytic capacitor E3. When the bus voltage P2+ obtained on the third electrolytic capacitor E3 remains stable and no longer changes, the bus sampling voltage VDC obtained by the input terminal VDC of the single-chip microcomputer U1 will also remain stable and no longer change. The single-chip microcomputer U1 compares the bus sampling voltage VDC with the bus sampling voltage threshold. When the bus sampling voltage VDC falls into the bus sampling voltage threshold range, the single-chip microcomputer U1 knows that the second charging is completed and is fully charged. The single-chip microcomputer U1 knows that the second charging circuit is connected normally during single-phase AC forward direction, and the second charging circuit is connected normally during single-phase AC reverse direction, and the conduction is normal, thereby realizing the second charging circuit detection during single-phase AC forward direction and the second charging circuit detection during single-phase AC reverse direction.

[0080] Step S203: Second current detection.

[0081] like Figure 7As shown, when the single-chip computer U1 learns that the second charging is completed and fully charged, the control terminal WH of the single-chip computer U1 is set to a low level, the third transistor M3 is disconnected, the coil is discharged, and the current flows through the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the sampling resistor seventh resistor R7 of the current detection circuit, the sixth transistor M6 and the third coil L3 in sequence to discharge in a circular manner, and the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the sampling resistor seventh resistor R7 of the current detection circuit, the sixth transistor M6 and the third coil L3 are connected in sequence to form a single-phase AC second current detection loop.

[0082] The first current sampling terminal OPA2_IP and the second current sampling terminal OPA2_IN of the single-chip microcomputer U1 obtain the sampling voltage on the seventh resistor R7 of the sampling resistor of the current detection circuit, thereby obtaining the sampling current. During the coil discharge process, the single-chip microcomputer U1 obtains the sampling current in real time, and learns the change process of the sampling current. If the change process is normal, it is known that the single-phase AC second current detection loop is connected normally and the conduction is normal, thereby realizing the detection of the single-phase AC second current detection loop.

[0083] Step S3: Normal working step.

[0084] When the single-chip computer U1 learns that step S2: the second charging and current detection steps are completed, the control terminal JDQ of the single-chip computer U1 is set to a high level, and the contact 2 and the contact 5 of the control relay RLY1 are turned on and work normally.

[0085] Explanation of the use of the second diode D2:

[0086] Because when the power is off, the motor may be dragged by external force to run, and the back electromotive force charging will be input into the third electrolytic capacitor E3. Therefore, if it is positive, the motor will be charged, and if it is negative, it will be blocked by the second diode D2.

[0087] During normal operation, one end of the second diode D2 is suspended without any effect.

[0088] Embodiment 2:

[0089] like Figure 8 As shown, the present invention discloses a device for surge control and phase loss detection, including a controller, a working power supply circuit, a motor drive circuit, a second diode D2, a charging switching circuit, a third electrolytic capacitor E3, a fourth electrolytic capacitor E4, a bus voltage detection circuit and a current detection circuit.

[0090] The difference between the second embodiment and the first embodiment is that a fourth electrolytic capacitor E4 is added, and the fourth electrolytic capacitor E4 is connected between the third electrolytic capacitor E3 and the ground GND. The similarities are not repeated here.

[0091] In Example 2 and Example 1, the structures of the controller, working power supply circuit, motor drive circuit, charging switching circuit, bus voltage detection circuit and current detection circuit are respectively the same. The difference is that the resistance values ​​of the resistors are different, the capacitance values ​​of the capacitors are different, and the withstand voltage values ​​of the resistors and capacitors are different according to the needs of use.

[0092] When in use, the input end of the working power supply circuit is electrically connected to the output end P1+ of the three-phase AC to DC conversion circuit.

[0093] The three-phase AC to DC circuit includes a three-phase rectifier bridge BR2, a first varistor MOV1, a second varistor MOV2, a third varistor MOV3 and a gas discharge tube DSA1. The first end L1 of the three-phase AC power supply is electrically connected to the contact 1 of the three-phase rectifier bridge BR2, the second end L2 of the three-phase AC power supply is electrically connected to the contact 2 of the three-phase rectifier bridge BR2, the third end L3 of the three-phase AC power supply is electrically connected to the contact 3 of the three-phase rectifier bridge BR2, one end of the first varistor MOV1 is electrically connected to the contact 1 of the three-phase rectifier bridge BR2, and the other end of the first varistor MOV1 is electrically connected to the contact 3 of the three-phase rectifier bridge BR2 via the third varistor MOV3. OV3 is electrically connected to the contact 3 of the three-phase rectifier bridge BR2, one end of the second varistor MOV2 is electrically connected to the contact 2 of the three-phase rectifier bridge BR2, the other end of the second varistor MOV2 is connected to the junction of the first varistor MOV1 and the third varistor MOV3, one end of the gas discharge tube DSA1 is connected to the junction of the first varistor MOV1 and the third varistor MOV3, the other end of the gas discharge tube DSA1 is grounded EARTH, the contact 5 of the three-phase rectifier bridge BR2 is the output terminal P1+ of the three-phase AC to DC circuit, and the contact 4 of the three-phase rectifier bridge BR2 is grounded GND.

[0094] Working process of embodiment 2:

[0095] Step S1': the first charging and current detection step.

[0096] Step S101 ′: charging and powering on for the first time.

[0097] like Fig. 9As shown, power is turned on, three-phase AC power is input to the three-phase rectifier bridge BR2, and the contact 5 of the three-phase rectifier bridge BR2 outputs a DC voltage P1+ to the input end of the working power supply circuit. The output end of the working power supply circuit outputs the microcontroller working voltage VCC to the microcontroller U1. The microcontroller U1 is powered on and starts working. The control end VH of the microcontroller U1 is set to a high level, and the control ends UH, WH, UL, VL and WL of the microcontroller U1 are set to a low level. The control end VH of the microcontroller U1 controls the second transistor M2 to be turned on with an initially set opening value. The current of the L1 phase passes through the contact 1 of the three-phase rectifier bridge BR2, the contact 5 of the three-phase rectifier bridge BR2, the second transistor M2, the second coil L2, the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, The third electrolytic capacitor E3, the fourth electrolytic capacitor E4, the contact 4 of the three-phase rectifier bridge BR2 and the contact 3 of the three-phase rectifier bridge BR2 return to the L3 phase, and the contact 5 of the three-phase rectifier bridge BR2, the second transistor M2, the second coil L2, the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4 and the contact 4 of the three-phase rectifier bridge BR2 are connected in series with the three-phase AC power supply to form a first charging circuit of the three-phase AC. The current output from the contact 5 of the three-phase rectifier bridge BR2 charges the third electrolytic capacitor E3 and the fourth electrolytic capacitor E4, and the bus voltage P2+ is obtained on the third electrolytic capacitor E3, that is, the output voltage of the output end P2+ of the charging switching circuit.

[0098] The similarities will not be repeated here.

[0099] Step S102 ′: Fully charge for the first time.

[0100] The current output from the contact 5 of the three-phase rectifier bridge BR2 continuously charges the third electrolytic capacitor E3 and the fourth electrolytic capacitor E4. When the bus voltage P2+ obtained on the third electrolytic capacitor E3 remains stable and no longer changes, the bus sampling voltage VDC obtained by the input terminal VDC of the single-chip microcomputer U1 will also remain stable and no longer change. The single-chip microcomputer U1 compares the bus sampling voltage VDC with the bus sampling voltage threshold. When the bus sampling voltage VDC falls within the bus sampling voltage threshold range, the single-chip microcomputer U1 knows that the first charging is completed and fully charged. The single-chip microcomputer U1 knows that the first charging circuit of the three-phase AC is connected normally and the conduction is normal, thereby realizing the detection of the first charging circuit of the three-phase AC.

[0101] The similarities will not be repeated here.

[0102] Step S103 ′: first current detection.

[0103] like Fig.10As shown, when the single-chip computer U1 learns that the first charging is completed and fully charged, the control terminal VH of the single-chip computer U1 is set to a low level, the second transistor M2 is disconnected, the coil is discharged, and the current flows through the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4, the sampling resistor seventh resistor R7 of the current detection circuit, the fifth transistor M5 and the second coil L2 in sequence for circular discharge, and the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4, the sampling resistor seventh resistor R7 of the current detection circuit, the fifth transistor M5 and the second coil L2 are connected in sequence to form a three-phase AC first current detection loop.

[0104] The first current sampling terminal OPA2_IP and the second current sampling terminal OPA2_IN of the single-chip microcomputer U1 obtain the sampling voltage on the seventh resistor R7 of the sampling resistor of the current detection circuit, thereby obtaining the sampling current. During the coil discharge process, the single-chip microcomputer U1 obtains the sampling current in real time, and learns the change process of the sampling current. If the change process is normal, it is known that the three-phase AC first current detection loop is connected normally and the conduction is normal, thereby realizing the detection of the three-phase AC first current detection loop.

[0105] The similarities will not be repeated here.

[0106] Step S2': a second charging and current detection step.

[0107] Step S201 ′: charging and powering on for the second time.

[0108] When the single-chip computer U1 learns that step S1': the first charging and current detection steps are completed, the control terminal WH of the single-chip computer U1 is set to a high level, and the control terminals UH, VH, UL, VL and WL of the single-chip computer U1 remain at a low level. The control terminal WH of the single-chip computer U1 controls the third transistor M3 to be turned on with an initially set opening value, and the current of the L1 phase passes through the contact 1 of the three-phase rectifier bridge BR2, the contact 5 of the three-phase rectifier bridge BR2, the third transistor M3, the third coil L3, the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4, the contact 4 of the three-phase rectifier bridge BR2 and the three-phase The contact 3 of the rectifier bridge BR2 returns to the L3 phase, and the contact 5 of the three-phase rectifier bridge BR2, the third transistor M3, the third coil L3, the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4 and the contact 4 of the three-phase rectifier bridge BR2 are connected in series with the three-phase AC power supply to form a second charging circuit of the three-phase AC. The current output from the contact 5 of the three-phase rectifier bridge BR2 charges the third electrolytic capacitor E3 and the fourth electrolytic capacitor E4, and the bus voltage P2+ is obtained on the third electrolytic capacitor E3, that is, the output voltage of the output end P2+ of the charging switching circuit.

[0109] The similarities will not be repeated here.

[0110] Step S202 ′: fully charge for the second time.

[0111] The current output from the contact 5 of the three-phase rectifier bridge BR2 continuously charges the third electrolytic capacitor E3 and the fourth electrolytic capacitor E4. When the bus voltage P2+ obtained on the third electrolytic capacitor E3 remains stable and no longer changes, the bus sampling voltage VDC obtained by the input terminal VDC of the single-chip microcomputer U1 will also remain stable and no longer change. The single-chip microcomputer U1 compares the bus sampling voltage VDC with the bus sampling voltage threshold. When the bus sampling voltage VDC falls within the bus sampling voltage threshold range, the single-chip microcomputer U1 knows that the second charging is completed and fully charged. The single-chip microcomputer U1 knows that the second charging circuit of the three-phase AC is connected normally and the conduction is normal, thereby realizing the second charging circuit detection of the three-phase AC.

[0112] Step S203 ′: second current detection.

[0113] When the single-chip computer U1 learns that the second charging is completed and fully charged, the control terminal WH of the single-chip computer U1 is set to a low level, the third transistor M3 is disconnected, the coil is discharged, and the current flows through the first coil L1, the second diode D2, the contact 3 and the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4, the sampling resistor seventh resistor R7 of the current detection circuit, the sixth transistor M6 and the third coil L3 in turn to discharge in a circular manner, and the first coil L1, the second diode D2, the contact 3 of the relay RLY1, the contact 5 of the relay RLY1, the third electrolytic capacitor E3, the fourth electrolytic capacitor E4, the sampling resistor seventh resistor R7 of the current detection circuit, the sixth transistor M6 and the third coil L3 are connected in turn to form a three-phase AC second current detection loop.

[0114] The first current sampling terminal OPA2_IP and the second current sampling terminal OPA2_IN of the single-chip microcomputer U1 obtain the sampling voltage on the seventh resistor R7 of the sampling resistor of the current detection circuit, thereby obtaining the sampling current. During the coil discharge process, the single-chip microcomputer U1 obtains the sampling current in real time, and learns the change process of the sampling current. If the change process is normal, it is known that the three-phase AC second current detection loop is connected normally and the conduction is normal, thereby realizing the detection of the three-phase AC second current detection loop.

[0115] Step S3': a normal working step.

[0116] When the single-chip computer U1 learns that step S2': the second charging and current detection steps are completed, the control terminal JDQ of the single-chip computer U1 is set to a high level, and the contact 2 and the contact 5 of the control relay RLY1 are connected to work normally.

[0117] In the above embodiment, the transistor may be an insulated gate bipolar transistor IGBT.

Claims

1. A device for surge control and phase loss detection, characterized in that: The invention comprises a controller, a working power supply circuit, a motor driving circuit, a second diode D2, a charging switching circuit, a third electrolytic capacitor E3, a bus voltage detection circuit and a current detection circuit. The motor driving circuit comprises first to sixth transistors M1-M6 and first to third coils L1-L3 of the motor. The control end of the controller is electrically connected to the gate of each transistor respectively, and the control end JDQ of the controller is electrically connected to the control end of the charging switching circuit. The collector of the first transistor M1, the collector of the second transistor M2 and the collector of the third transistor M3 are electrically connected. The emitter of the first transistor M1 is electrically connected to the collector of the fourth transistor M4, the emitter of the second transistor M2 is electrically connected to the collector of the fifth transistor M5, the emitter of the third transistor M3 is electrically connected to the collector of the sixth transistor M6, the emitter of the fourth transistor M4, the emitter of the fifth transistor M5 and the emitter of the sixth transistor M6 are electrically connected. One end of the first coil L1, one end of the second coil L2 and one end of the third coil L3 are electrically connected. The other end of the first coil L1 is electrically connected to the emitter of the first transistor M1. The other end of the second coil L2 is electrically connected to the emitter of the second transistor M2, and the other end of the third coil L3 is electrically connected to the emitter of the third transistor M3; the input end of the power supply circuit is used to be electrically connected to the output end P1+ of the AC-DC converter circuit, the output end VCC of the power supply circuit is electrically connected to the controller and the charging switching circuit respectively, and the collector of the first transistor M1 is electrically connected to the input end of the working power supply circuit; the emitter of the first transistor M1 is electrically connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the ground GND via the normally closed contact of the charging switching circuit and the third electrolytic capacitor E3 in sequence, one end of the normally open contact of the charging switching circuit is connected to the ground GND via the third electrolytic capacitor E3, and the other end of the normally open contact of the charging switching circuit is electrically connected to the input end of the power supply circuit; the input end of the bus voltage detection circuit is electrically connected to the third electrolytic capacitor E3 on the charging switching circuit side, the sampling end of the bus voltage detection circuit is electrically connected to the input end VDC of the controller, the sampling end of the current detection circuit is electrically connected to the emitter of the fifth transistor M5, and the output end of the current detection circuit is electrically connected to the current sampling end of the controller.

2. The device for surge control and phase loss detection according to claim 1, characterized in that: The charging switching circuit includes a relay RLY1, a third diode D3 and a sixth resistor R6, the contact 3 and the contact 5 of the relay RLY1 form a normally closed contact, the contact 2 and the contact 5 of the relay RLY1 form a normally open contact, the cathode of the second diode D2 is electrically connected to the contact 3 of the relay RLY1, the contact 1 of the relay RLY1 is electrically connected to the output terminal VCC of the power supply circuit and the cathode of the third diode D3 respectively, the anode of the third diode D3 is electrically connected to the contact 4 of the relay RLY1, the contact 4 of the relay RLY1 is electrically connected to the control terminal JDQ of the controller via the sixth resistor R6, the contact 5 of the relay RLY1 is grounded GND via the third electrolytic capacitor E3, the contact 2 of the relay RLY1 is electrically connected to the collector of the first transistor M1, and the contact 2 of the relay RLY1 is used to be electrically connected to the output terminal P1+ of the AC-to-DC circuit.

3. The device for surge control and phase loss detection according to claim 1, characterized in that: The working power supply circuit includes a power supply circuit, a first diode D1, a first electrolytic capacitor E1 and a second electrolytic capacitor E2. The cathode of the first diode D1 is electrically connected to the input end of the power supply circuit. The input end of the power supply circuit is grounded GND via the first electrolytic capacitor E1. The output end VCC of the power supply circuit is grounded GND via the second electrolytic capacitor E2. The anode of the first diode D1 is the input end of the working power supply circuit. The output end VCC of the power supply circuit is the output end of the working power supply circuit.

4. The device for surge control and phase loss detection according to claim 1, characterized in that: The controller includes a single-chip computer U1, a transistor QA1, a tenth resistor R10 and a third capacitor C3. The control terminal JDQ of the single-chip computer U1 is electrically connected to the base of the transistor QA1 via the tenth resistor R10. The base of the transistor QA1 is grounded GND via the third capacitor C3. The emitter of the transistor QA1 is grounded GND. The collector of the transistor QA1 is electrically connected to the control terminal of the charging switching circuit. The control terminal UH of the single-chip computer U1 is electrically connected to the gate of the first transistor M1. The control terminal VH of the single-chip computer U1 is electrically connected to the gate of the second transistor M2. The control terminal WH of the single-chip computer U1 is electrically connected to the gate of the third transistor M3, the control terminal UL of the single-chip computer U1 is electrically connected to the gate of the fourth transistor M4, the control terminal VL of the single-chip computer U1 is electrically connected to the gate of the fifth transistor M5, and the control terminal WL of the single-chip computer U1 is electrically connected to the gate of the sixth transistor M6; the first current sampling terminal OPA2_IP of the single-chip computer U1 is electrically connected to the first output terminal of the current detection circuit, and the second current sampling terminal OPA2_IN of the single-chip computer U1 is electrically connected to the second output terminal of the current detection circuit.

5. The device for surge control and phase loss detection according to claim 1, characterized in that: The bus voltage detection circuit includes first to fifth resistors R1~R5 and a first capacitor C1. The third electrolytic capacitor E3 on the charging switching circuit side is electrically connected to the input terminal VDC of the controller via the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 in sequence. The input terminal VDC of the controller is grounded GND via the first capacitor C1, and the junction of the third resistor R3 and the fourth resistor R4 is grounded GND via the fifth resistor R5.

6. The device for surge control and phase loss detection according to claim 1, characterized in that: The current detection circuit includes seventh to ninth resistors R7~R9 and a second capacitor C2, the current sampling end of the controller includes a first current sampling end OPA2_IP and a second current sampling end OPA2_IN, the first current sampling end OPA2_IP of the controller is connected to the ground GND via the eighth resistor R8 and the seventh resistor R7 in sequence, the second current sampling end OPA2_IN of the controller is connected to the ground GND via the ninth resistor R9, the second capacitor C2 is electrically connected between the first current sampling end OPA2_IP and the second current sampling end OPA2_IN of the controller, the combination of the eighth resistor R8 and the second capacitor C2 is the first output end of the current detection circuit, and the combination of the ninth resistor R9 and the second capacitor C2 is the second output end of the current detection circuit; the combination of the seventh resistor R7 and the eighth resistor R8 is electrically connected to the emitter of the fifth transistor M5, the seventh resistor R7 is a sampling resistor, and the combination of the seventh resistor R7 and the eighth resistor R8 is the sampling end of the current detection circuit.

7. The device for surge control and phase loss detection according to claim 1, characterized in that: It also includes an AC-DC converter circuit, and the input end of the power supply circuit is electrically connected to the output end P1+ of the AC-DC converter circuit.

8. The device for surge control and phase loss detection according to claim 7, characterized in that: The AC-to-DC circuit is a single-phase AC-to-DC circuit, which includes a single-phase rectifier bridge BR1, a varistor MOV1 and a fuse FUSE1. One end of the single-phase AC power supply is electrically connected to contact 1 of the single-phase rectifier bridge BR1 via the fuse FUSE1, and the other end of the single-phase AC power supply is electrically connected to contact 3 of the single-phase rectifier bridge BR1. The varistor MOV1 is electrically connected between contacts 1 and 3 of the single-phase rectifier bridge BR1. Contact 2 of the single-phase rectifier bridge BR1 is the output end P1+ of the single-phase AC-to-DC circuit, and contact 4 of the single-phase rectifier bridge BR1 is grounded GND.

9. The device for surge control and phase loss detection according to claim 7, characterized in that: The AC-DC circuit is a three-phase AC-DC circuit, and also includes a fourth electrolytic capacitor E4, which is connected between the third electrolytic capacitor E3 and the ground GND; the three-phase AC-DC circuit includes a three-phase rectifier bridge BR2, a first varistor MOV1, a second varistor MOV2, a third varistor MOV3 and a gas discharge tube DSA1, a first end L1 of the three-phase AC power supply is electrically connected to a contact 1 of the three-phase rectifier bridge BR2, a second end L2 of the three-phase AC power supply is electrically connected to a contact 2 of the three-phase rectifier bridge BR2, a third end L3 of the three-phase AC power supply is electrically connected to a contact 3 of the three-phase rectifier bridge BR2, one end of the first varistor MOV1 is electrically connected to a contact 4 of the three-phase rectifier bridge BR2, and one end of the first varistor MOV1 is electrically connected to a contact 5 of the three-phase rectifier bridge BR2. Contact 1 is electrically connected, the other end of the first varistor MOV1 is electrically connected to the contact 3 of the three-phase rectifier bridge BR2 via the third varistor MOV3, one end of the second varistor MOV2 is electrically connected to the contact 2 of the three-phase rectifier bridge BR2, the other end of the second varistor MOV2 is connected to the junction of the first varistor MOV1 and the third varistor MOV3, one end of the gas discharge tube DSA1 is connected to the junction of the first varistor MOV1 and the third varistor MOV3, the other end of the gas discharge tube DSA1 is grounded EARTH, the contact 5 of the three-phase rectifier bridge BR2 is the output end P1+ of the three-phase AC to DC circuit, and the contact 4 of the three-phase rectifier bridge BR2 is grounded GND.

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