Dual power switching control circuit, substrate and controller

Abstract

The application provides a dual power switching control circuit, a substrate and a controller, and relates to the technical field of controllers.The circuit comprises a power supply circuit, a phase failure detection circuit, a control signal generation circuit and a motor conversion control circuit.The power supply circuit comprises a normal power supply circuit and a backup power supply circuit.The motor conversion control circuit comprises a bidirectional thyristor.The power supply circuit converts normal power supply signals and backup power supply signals to generate normal voltage and backup voltage.The phase failure detection circuit detects the normal power supply signals to obtain a phase failure control signal.The control signal generation circuit outputs normal power supply switching signals and backup power supply switching signals according to the phase failure control signal.The motor conversion control circuit controls the state of the bidirectional thyristor according to the normal power supply switching signals and the backup power supply switching signals to make the motor rotate and control the switching between the normal power supply and the backup power supply, so as to reduce the complexity and power consumption of the circuit.

Description

Technical Field

[0001] This application relates to the field of controller technology, and in particular to a dual power supply switching control circuit, a base plate, and a controller. Background Technology

[0002] In related technologies, a microcontroller unit (MCU) and software control program are typically used to switch between primary and backup power supplies. This approach often involves complex circuit designs, a large number of electronic components, and requires software control programs for logic judgment and control, resulting in high costs and a high failure rate due to control logic errors.

[0003] On the other hand, when switching between the main power supply and the backup power supply for motor drives, the relevant technologies typically employ traditional electromagnetic devices such as electromagnetic relays or contactors. The forward and reverse rotation of the motor is achieved by controlling the engagement and disengagement of these electromagnetic devices, thereby controlling the switching action to switch between the main power supply and the backup power supply. However, the engagement and disengagement of electromagnetic devices generate momentary electric arcs, which can burn the contacts of the electromagnetic devices, shortening their lifespan. Furthermore, the continuous engagement of the electromagnetic devices requires energy from their internal coils, leading to overheating, increased temperature rise, and increased power consumption.

[0004] Therefore, when implementing the switching function between the main power supply and the backup power supply, how to reduce the complexity of the circuit and the power consumption is an important problem that needs to be solved. Utility Model Content

[0005] This application provides a dual power supply switching control circuit, a substrate, and a controller to reduce circuit complexity and power consumption.

[0006] In a first aspect, this application provides a dual power supply switching control circuit for switching between a primary power supply and a backup power supply. The dual power supply switching control circuit includes: a power supply circuit, a phase loss detection circuit, a control signal generation circuit, and a motor conversion control circuit; the power supply circuit includes a primary power supply circuit and a backup power supply circuit; the motor conversion control circuit includes a bidirectional thyristor. The control signal generation circuit is electrically connected to the main power supply circuit, the backup power supply circuit, the phase loss detection circuit, and the motor conversion control circuit, respectively. The power supply circuit is configured to convert the normal power supply signal and the backup power supply signal to generate the normal voltage and the backup voltage; and to provide power to the control signal generation circuit and the motor conversion control circuit. The phase loss detection circuit is configured to detect phase loss in the common power supply signal, obtain a phase loss control signal, and transmit the phase loss control signal to the control signal generation circuit. The control signal generation circuit is configured to output a normal power supply switching signal and a backup power supply switching signal according to the phase loss control signal; at the same time, one of the normal power supply switching signal and the backup power supply switching signal is at a high level and the other is at a low level. The motor switching control circuit is configured to control the state of the bidirectional thyristor according to the normal power supply switching signal and the backup power supply switching signal, so as to make the motor rotate and control the switching between the normal power supply and the backup power supply.

[0007] In one possible design, the commonly used power supply circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a first Zener diode, and a first rectifier bridge; the commonly used power supply signals include: commonly used A-phase voltage and commonly used N-phase voltage; The first end of the first resistor is used to connect to the common A-phase voltage. The second end of the first resistor is electrically connected to the first end of the second resistor. The second end of the second resistor is electrically connected to the first end of the first capacitor and the first end of the third resistor, respectively. The second end of the third resistor is electrically connected to the first end of the fourth resistor. The second end of the fourth resistor is electrically connected to the second end of the first capacitor and the first input end of the first rectifier bridge. The second input end of the first rectifier bridge is used to connect to the commonly used N-phase voltage. The first output terminal of the first rectifier bridge is electrically connected to the cathode of the first Zener diode, the positive terminal of the second capacitor, and the first terminal of the third capacitor, and serves as the output terminal of the common power supply circuit for outputting the common voltage. The second output terminal of the first rectifier bridge, the anode of the first Zener diode, the cathode of the second capacitor, and the second terminal of the third capacitor are all connected to the common power supply ground.

[0008] In one possible design, the backup power supply circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second Zener diode, and a second rectifier bridge; the backup power supply signal includes: a backup A-phase voltage and a backup N-phase voltage; The first end of the fifth resistor is used to connect to the spare phase A voltage, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor, and the second end of the sixth resistor is electrically connected to the first end of the fourth capacitor and the first end of the seventh resistor, respectively. The second end of the seventh resistor is electrically connected to the first end of the eighth resistor, and the second end of the eighth resistor is electrically connected to the second end of the fourth capacitor and the first input end of the second rectifier bridge. The second input end of the second rectifier bridge is used to connect to the spare N-phase voltage. The first output terminal of the second rectifier bridge is electrically connected to the cathode of the second Zener diode, the positive terminal of the fifth capacitor, and the first terminal of the sixth capacitor, and serves as the output terminal of the backup power supply circuit for outputting the backup voltage. The second output terminal of the second rectifier bridge, the anode of the second Zener diode, the cathode of the fifth capacitor, and the second terminal of the sixth capacitor are all connected to the backup power supply ground.

[0009] In one possible design, the phase loss detection circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first diode, a second diode, a third diode, and a first transistor; the commonly used power supply signal also includes: a commonly used B-phase voltage and a commonly used C-phase voltage; The first end of the ninth resistor is electrically connected to the first end of the eleventh resistor for connecting the common A-phase voltage; the second end of the ninth resistor is electrically connected to the first end of the tenth resistor; and the second end of the tenth resistor is electrically connected to the anode of the first diode. The cathode of the first diode is electrically connected to the second terminal of the first transistor, the first terminal of the ninth capacitor, the positive terminal of the tenth capacitor, the first terminal of the nineteenth resistor, and the first terminal of the twentieth resistor, respectively, and serves as the output terminal of the phase loss detection circuit for outputting the phase loss control signal. The second end of the eleventh resistor is electrically connected to the first end of the twelfth resistor, the first end of the thirteenth resistor is connected to the commonly used B-phase voltage, the second end of the thirteenth resistor is electrically connected to the first end of the fourteenth resistor, the first end of the fifteenth resistor is connected to the commonly used C-phase voltage, and the second end of the fifteenth resistor is electrically connected to the first end of the sixteenth resistor. The second end of the twelfth resistor is electrically connected to the second end of the fourteenth resistor, the second end of the sixteenth resistor, and the anode of the second diode, respectively; the cathode of the second diode is electrically connected to the first end of the seventeenth resistor. The second end of the seventeenth resistor is electrically connected to the first end of the eighteenth resistor, the first end of the seventh capacitor, the positive terminal of the eighth capacitor, and the control terminal of the first transistor. The second end of the twentieth resistor is electrically connected to the cathode of the third diode; The second end of the eighteenth resistor is electrically connected to the second end of the seventh capacitor, the negative terminal of the eighth capacitor, the first end of the first transistor, the second end of the ninth capacitor, the negative terminal of the tenth capacitor, the second end of the nineteenth resistor, and the anode of the third diode, and is used to connect to the commonly used N-phase voltage.

[0010] In one possible design, the control signal generating circuit includes: a 21st resistor, a 22nd resistor, a 23rd resistor, a 24th resistor, a 25th resistor, a 26th resistor, a 27th resistor, a 28th resistor, a 29th resistor, a 30th resistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a 34th resistor, an 11th capacitor, a 12th capacitor, a 4th diode, a 5th diode, a 6th diode, a 2nd transistor, a 3rd transistor, a 4th transistor, a 5th transistor, a 6th transistor, a 1st optocoupler, and a 2nd optocoupler; The first end of the 21st resistor is used to receive the phase loss control signal, and the second end of the 21st resistor is electrically connected to the cathode of the fourth diode and the first end of the first optocoupler, respectively. The second end of the first optocoupler is electrically connected to the first end of the second optocoupler, and the anode of the fourth diode is electrically connected to the second end of the second optocoupler and is used to connect to the commonly used N-phase voltage; The fourth terminal of the first optocoupler is electrically connected to the first terminal of the 22nd resistor and the first terminal of the 23rd resistor, respectively. The second terminal of the 22nd resistor is electrically connected to the first terminal of the 25th resistor and is used to connect to the common voltage. The second end of the 23rd resistor is electrically connected to the second end of the second transistor, the first end of the 26th resistor, and the control end of the third transistor, respectively. The third terminal of the first optocoupler is electrically connected to the first terminal of the 24th resistor, and the second terminal of the 24th resistor is electrically connected to the control terminal of the second transistor. The second end of the 25th resistor is electrically connected to the second end of the third transistor, the anode of the fifth diode, and the second end of the fourth transistor, and serves as the first output terminal of the control signal generation circuit for outputting the common power supply switching signal. The cathode of the fifth diode is electrically connected to the first end of the second seventeenth resistor, and the second end of the second seventeenth resistor is electrically connected to the first end of the second eighteenth resistor, the positive terminal of the eleventh capacitor, and the control terminal of the fourth transistor. The first terminal of the second transistor, the second terminal of the second sixteenth resistor, the first terminal of the third transistor, the second terminal of the second eighteenth resistor, the negative terminal of the eleventh capacitor, and the first terminal of the fourth transistor are all connected to the common power supply ground. The third end of the second optocoupler is electrically connected to the first end of the thirtieth resistor, the fourth end of the second optocoupler is electrically connected to the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is electrically connected to the first end of the thirty-second resistor, and is connected to the backup voltage; The second terminal of the thirty-second resistor is electrically connected to the anode of the sixth diode, the second terminal of the fifth transistor, and the second terminal of the sixth transistor, respectively, and serves as the second output terminal of the control signal generation circuit for outputting the backup power switching signal; The cathode of the sixth diode is electrically connected to the first end of the thirty-third resistor, and the second end of the thirty-third resistor is electrically connected to the first end of the thirty-fourth resistor, the positive terminal of the twelfth capacitor, and the control terminal of the sixth transistor. The second end of the thirtieth resistor is electrically connected to the first end of the thirty-first resistor and the control terminal of the fifth transistor, respectively. The second terminal of the thirty-first resistor, the first terminal of the fifth transistor, the second terminal of the thirty-fourth resistor, the negative terminal of the twelfth capacitor, and the first terminal of the sixth transistor are all connected to the backup power supply ground.

[0011] In one possible design, the motor conversion control circuit includes: a bidirectional thyristor control circuit and a motor drive circuit; The bidirectional thyristor control circuit is configured to control the bidirectional thyristor to conduct according to the normal power supply switching signal and the backup power supply switching signal; The motor drive circuit is configured to drive the motor to rotate when the bidirectional thyristor is turned on, so as to control the switching between the main power supply and the backup power supply.

[0012] In one possible design, the bidirectional thyristor control circuit includes: a 35th resistor, a 36th resistor, a 37th resistor, a 38th resistor, a 39th resistor, a 40th resistor, a 41st resistor, a 42nd resistor, a 43rd resistor, a 44th resistor, a 45th resistor, a 46th resistor, a 47th resistor, a 48th resistor, a first thyristor driver chip, a second thyristor driver chip, a third thyristor driver chip, a fourth thyristor driver chip, a seventh transistor, an eighth transistor, a first bidirectional thyristor, a second bidirectional thyristor, a third bidirectional thyristor, and a fourth bidirectional thyristor; The first end of the thirty-fifth resistor is connected to the common voltage, the second end of the thirty-fifth resistor is electrically connected to the first end of the first thyristor driver chip, the second end of the first thyristor driver chip is electrically connected to the first end of the second thyristor driver chip, and the second end of the second thyristor driver chip is electrically connected to the second end of the seventh transistor. The first end of the thirty-eighth resistor is used to connect to the common power supply switching signal. The second end of the thirty-eighth resistor is electrically connected to the first end of the thirty-ninth resistor and the control terminal of the seventh transistor. The second end of the thirty-ninth resistor and the first end of the seventh transistor are both connected to the common power supply ground. The sixth terminal of the first thyristor driver chip is electrically connected to the first terminal of the thirty-sixth resistor, and the fourth terminal of the first thyristor driver chip is electrically connected to the first terminal of the thirty-seventh resistor and the control terminal of the first bidirectional thyristor. The second end of the thirty-sixth resistor is electrically connected to the first end of the first bidirectional thyristor and the motor drive circuit, respectively; the second end of the thirty-seventh resistor is electrically connected to the second end of the first bidirectional thyristor and the motor drive circuit, respectively. The sixth terminal of the second thyristor driver chip is electrically connected to the first terminal of the fortieth resistor, and the fourth terminal of the second thyristor driver chip is electrically connected to the first terminal of the forty-first resistor and the control terminal of the second bidirectional thyristor. The second end of the fortieth resistor is electrically connected to the first end of the second bidirectional thyristor and the motor drive circuit, respectively. The second end of the forty-first resistor is electrically connected to the second end of the second bidirectional thyristor and is used to connect to the commonly used N-phase voltage. The first end of the forty-second resistor is connected to the backup voltage, the second end of the forty-second resistor is electrically connected to the first end of the third thyristor driver chip, the second end of the third thyristor driver chip is electrically connected to the first end of the fourth thyristor driver chip, and the second end of the fourth thyristor driver chip is electrically connected to the second end of the eighth transistor. The first end of the forty-fifth resistor is used to receive the backup power switching signal. The second end of the forty-fifth resistor is electrically connected to the first end of the forty-sixth resistor and the control terminal of the eighth transistor. The second end of the forty-sixth resistor and the first end of the eighth transistor are both connected to the backup power ground. The sixth terminal of the third thyristor driver chip is electrically connected to the first terminal of the forty-third resistor, and the fourth terminal of the third thyristor driver chip is electrically connected to the first terminal of the forty-fourth resistor and the control terminal of the third bidirectional thyristor. The second end of the forty-third resistor is electrically connected to the first end of the third bidirectional thyristor and the motor drive circuit, respectively; the second end of the forty-fourth resistor is electrically connected to the second end of the third bidirectional thyristor and the motor drive circuit, respectively. The sixth terminal of the fourth thyristor driver chip is electrically connected to the first terminal of the forty-seventh resistor, and the fourth terminal of the fourth thyristor driver chip is electrically connected to the first terminal of the forty-eighth resistor and the control terminal of the fourth bidirectional thyristor. The second end of the forty-seventh resistor is electrically connected to the first end of the fourth bidirectional thyristor and the motor drive circuit, respectively. The second end of the forty-eighth resistor is electrically connected to the second end of the fourth bidirectional thyristor and is used to connect to the spare N-phase voltage.

[0013] In one possible design, the motor drive circuit includes: a first micro switch, a second micro switch, a motor, and a mode switch; The first terminal of the first micro switch is used to connect to the commonly used A-phase voltage, the third terminal of the first micro switch is electrically connected to the first terminal of the first bidirectional thyristor, the first terminal of the motor is electrically connected to the second terminal of the first bidirectional thyristor, and the second terminal of the motor is electrically connected to the second terminal of the third bidirectional thyristor. The first terminal of the second micro switch is used to connect to the backup phase A voltage, and the third terminal of the second micro switch is electrically connected to the first terminal of the third bidirectional thyristor. The third terminal of the motor is electrically connected to the first terminal of the mode switch, and the second terminal of the mode switch is electrically connected to the first terminal of the second bidirectional thyristor and the first terminal of the fourth bidirectional thyristor.

[0014] In a second aspect, this application provides a substrate comprising: a dual power supply switching control circuit as described in the first aspect.

[0015] Thirdly, this application provides a controller, including: a substrate as described in the second aspect.

[0016] The beneficial effects of the embodiments of this application are as follows: In this embodiment, the forward or reverse rotation control of the motor is achieved through a hardware circuit consisting of a power supply circuit, a phase loss detection circuit, a control signal generation circuit, and a motor switching control circuit. This enables switching between the main power supply and the backup power supply. Compared to schemes using microcontroller units and software control programs, the control circuit, composed of discrete components, has a simpler circuit structure, fewer components, and does not require software control programs. Furthermore, the main power supply switching signal and the backup power supply switching signal are interlocked, which can avoid errors in the motor drive control logic, reduce the product's failure rate, and lower the circuit complexity. On the other hand, by controlling the state of the bidirectional thyristor to make the motor rotate, instantaneous arcing is prevented. Moreover, the bidirectional thyristor is a semi-controlled device, which can maintain its conduction state automatically without a control signal after it is turned on, which can reduce the power consumption of the circuit and solve the problems of contact life and coil power consumption that exist when using electromagnetic devices, thus reducing the power consumption of the circuit. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the circuit structure of a dual power supply switching control circuit provided in an embodiment of this application; Figure 2 A schematic diagram of a commonly used power supply circuit provided for an embodiment of this application; Figure 3 A schematic diagram of the circuit structure of a backup power supply circuit provided in an embodiment of this application; Figure 4 A schematic diagram of the circuit structure of a phase loss detection circuit provided in an embodiment of this application; Figure 5 A schematic diagram of the circuit structure of a control signal generation circuit provided in an embodiment of this application; Figure 6 This is a schematic diagram of the circuit structure of a motor conversion control circuit provided in an embodiment of this application. Detailed Implementation

[0019] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0022] To address the issues of high circuit complexity and high power consumption in related technologies, this application provides a dual-power supply switching control circuit for switching between a primary power supply and a backup power supply. See also... Figure 1 , Figure 1 This is a schematic diagram of the circuit structure of a dual power supply switching control circuit provided in an embodiment of this application, as shown below. Figure 1 As shown, the dual power supply switching control circuit 1000 may include: a power supply circuit 100, a phase loss detection circuit 200, a control signal generation circuit 300, and a motor conversion control circuit 400; the power supply circuit 100 includes a main power supply circuit 10 and a backup power supply circuit 11; the motor conversion control circuit 400 includes a bidirectional thyristor.

[0023] The control signal generation circuit 300 is electrically connected to the main power supply circuit 10, the backup power supply circuit 11, the phase loss detection circuit 200, and the motor conversion control circuit 400, respectively.

[0024] The power supply circuit 100 is configured to convert the normal power supply signal and the backup power supply signal to generate the normal voltage N_VCC and the backup voltage R_VCC; and to provide power to the control signal generation circuit 300 and the motor conversion control circuit 400.

[0025] The phase loss detection circuit 200 is configured to perform phase loss detection on the common power supply signal, obtain the phase loss control signal phase_detect, and transmit the phase loss control signal phase_detect to the control signal generation circuit 300.

[0026] The control signal generation circuit 300 is configured to output a normal power supply switching signal TURN_TO_N and a backup power supply switching signal TURN_TO_R based on the phase loss control signal phase_detect; at the same time, one of the normal power supply switching signal TURN_TO_N and the backup power supply switching signal TURN_TO_R is at a high level and the other is at a low level.

[0027] The motor switching control circuit 400 is configured to control the state of the bidirectional thyristor according to the main power supply switching signal TURN_TO_N and the backup power supply switching signal TURN_TO_R, so as to make the motor rotate and control the switching between the main power supply and the backup power supply.

[0028] Dual power supply switching control circuits can be applied in controllers to switch between a primary power supply and a backup power supply. By controlling the motor to rotate forward or backward, and using a linkage device connected to the motor to control the switch action, the switching between the primary and backup power supplies is achieved. When the primary power supply fails, it switches to the backup power supply; when the primary power supply fault is resolved and normal operation is restored, it switches back to the primary power supply.

[0029] The main power signal is the output signal of the main power supply, and the backup power signal is the output signal of the backup power supply. Both the main power signal and the backup power signal are AC. AC includes the neutral wire and the live wire. The live wire includes phase A, phase B, and phase C, and the neutral wire is also called the N phase.

[0030] The power supply circuit 100 converts the normal power supply signal and the backup power supply signal, and generates the normal voltage N_VCC and the backup voltage R_VCC after rectification and voltage regulation. When the normal power supply or the backup power supply is working, it provides power to the control signal generation circuit 300 and the motor conversion control circuit 400.

[0031] A phase loss in a power supply system refers to an electrical fault caused by an abnormal voltage or open circuit in any phase of the power supply. A phase loss can lead to serious consequences such as equipment damage and operational abnormalities. Therefore, a phase loss detection circuit is needed to detect phase loss in the primary power supply signal. By sampling the phase vector sum of the three-phase voltages in real time, it determines whether a phase loss fault exists in the primary power supply. The phase loss control signal `phase_detect` output by the phase loss detection circuit is used to characterize whether a phase loss fault exists in the primary power supply. When a phase loss fault exists in the primary power supply, the circuit switches to the backup power supply.

[0032] The control signal generation circuit outputs a primary power switching signal TURN_TO_N and a backup power switching signal TURN_TO_R based on the phase loss control signal phase_detect. The primary power switching signal TURN_TO_N controls the motor rotation to switch to the primary power supply, while the backup power switching signal TURN_TO_R controls the motor rotation to switch to the backup power supply. At any given time, one of the primary power switching signals TURN_TO_N and TURN_TO_R is high, and the other is low, forming an interlocked state. This prevents errors in the motor drive control logic and reduces the product's failure rate.

[0033] The motor switching control circuit controls the state of the bidirectional thyristor based on the primary power supply switching signal TURN_TO_N and the backup power supply switching signal TURN_TO_R, thereby causing the motor to rotate, either forward or reverse, and controlling the switching between the primary power supply and the backup power supply to achieve the power switching function. By controlling the state of the bidirectional thyristor to drive the motor, this replaces the solution of driving the motor with electromagnetic devices in related technologies, eliminating the need for coils to consume electrical energy and reducing the power consumption of the circuit.

[0034] In this embodiment, the forward or reverse rotation control of the motor is achieved through a hardware circuit consisting of a power supply circuit, a phase loss detection circuit, a control signal generation circuit, and a motor switching control circuit. This enables switching between the main power supply and the backup power supply. Compared to solutions using a microcontroller unit (MCU) and software control program, the control circuit, composed of discrete components, has a simpler circuit structure, fewer components, and requires no software control program. Furthermore, the main power supply switching signal and the backup power supply switching signal are interlocked, which can prevent errors in the motor drive control logic, reduce the product failure rate, and lower the circuit complexity. On the other hand, by controlling the state of the bidirectional thyristor to make the motor rotate, instantaneous arcing is prevented. Moreover, the bidirectional thyristor is a semi-controlled device, which can maintain its conduction state without control signals after it is turned on, thereby reducing the power consumption of the circuit. This solves the problems of contact life and coil power consumption that exist when using electromagnetic devices, thus reducing the power consumption of the circuit.

[0035] In one possible embodiment, see Figure 2 , Figure 2 A schematic diagram of a commonly used power supply circuit provided in the embodiments of this application is shown below. Figure 2 As shown, the commonly used power supply circuit 10 may include: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first Zener diode ZD1, and a first rectifier bridge DB1; the commonly used power supply signals include: the commonly used A-phase voltage NA and the commonly used N-phase voltage NN.

[0036] The first end of the first resistor R1 is used to connect to the common A-phase voltage NA. The second end of the first resistor R1 is electrically connected to the first end of the second resistor R2. The second end of the second resistor R2 is electrically connected to the first end of the first capacitor C1 and the first end of the third resistor R3, respectively.

[0037] The second end of the third resistor R3 is electrically connected to the first end of the fourth resistor R4. The second end of the fourth resistor R4 is electrically connected to the second end of the first capacitor C1 and the first input end of the first rectifier bridge DB1. The second input end of the first rectifier bridge DB1 is used to connect to the commonly used N-phase voltage NN.

[0038] The first output terminal of the first rectifier bridge DB1 is electrically connected to the cathode of the first Zener diode ZD1, the positive terminal of the second capacitor C2, and the first terminal of the third capacitor C3, and serves as the output terminal of the common power supply circuit 10 to output the common voltage N_VCC.

[0039] The second output terminal of the first rectifier bridge DB1, the anode of the first Zener diode ZD1, the cathode of the second capacitor C2, and the second terminal of the third capacitor C3 are all connected to the common power supply ground GND_N.

[0040] The common power supply circuit provides power to the control signal generation circuit 300 and the motor conversion control circuit 400 when the common power supply is working. The common power supply signal consists of phases A and N of the common power supply, namely the common phase A voltage NA and the common phase N voltage NN. After being current-limited by the current-limiting resistors (i.e., the first resistor R1 and the second resistor R2), it is input to the first capacitor C1 for voltage reduction and then transmitted to the first rectifier bridge DB1 to convert the AC voltage to DC voltage. After being regulated by the first Zener diode ZD1, the voltage is filtered by the second capacitor C2 and the third capacitor C3 to obtain the common voltage N_VCC.

[0041] In one example, the common power supply circuit 10 can convert a 220VAC common power supply signal into a 12VDC common voltage N_VCC.

[0042] It should be noted that the commonly used power supply signal refers to phases A and N of the commonly used power supply, namely the commonly used phase A voltage NA and the commonly used phase N voltage NN. This is only one example of this application. The commonly used power supply signal in this application can also be phases B and N or phases C and N of the commonly used power supply. No specific limitation is made in this regard.

[0043] In one possible embodiment, see Figure 3 , Figure 3 A schematic diagram of a backup power supply circuit provided in an embodiment of this application is shown below. Figure 3 As shown, the backup power supply circuit 11 may include: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a second Zener diode ZD2, and a second rectifier bridge DB2; the backup power supply signals include: backup A-phase voltage RA and backup N-phase voltage RN.

[0044] The first end of the fifth resistor R5 is used to connect the standby A-phase voltage RA. The second end of the fifth resistor R5 is electrically connected to the first end of the sixth resistor R6. The second end of the sixth resistor R6 is electrically connected to the first end of the fourth capacitor C4 and the first end of the seventh resistor R7, respectively.

[0045] The second end of the seventh resistor R7 is electrically connected to the first end of the eighth resistor R8. The second end of the eighth resistor R8 is electrically connected to the second end of the fourth capacitor C4 and the first input end of the second rectifier bridge DB2. The second input end of the second rectifier bridge DB2 is used to connect the spare N-phase voltage RN.

[0046] The first output terminal of the second rectifier bridge DB2 is electrically connected to the cathode of the second Zener diode ZD2, the positive terminal of the fifth capacitor C5, and the first terminal of the sixth capacitor C6, respectively, and serves as the output terminal of the backup power supply circuit 11 to output the backup voltage R_VCC.

[0047] The second output terminal of the second rectifier bridge DB2, the anode of the second Zener diode ZD2, the cathode of the fifth capacitor C5, and the second terminal of the sixth capacitor C6 are all connected to the backup power ground GND_R.

[0048] The backup power supply circuit provides power to the control signal generation circuit 300 and the motor conversion control circuit 400 when the backup power supply is working. The backup power supply signal consists of phases A and N of the backup power supply, namely the backup phase A voltage RA and the backup phase N voltage RN. After being current-limited by the current-limiting resistors (i.e., the fifth resistor R5 and the sixth resistor R6), it is input to the fourth capacitor C4 for voltage reduction and then transmitted to the second rectifier bridge DB2 to convert the AC voltage to DC voltage. After being regulated by the second Zener diode ZD2, the backup voltage R_VCC is obtained after filtering by the fifth capacitor C5 and the sixth capacitor C6.

[0049] In one example, the backup power circuit 11 can convert a 220VAC backup power signal into a 12VDC backup voltage R_VCC.

[0050] It should be noted that the backup power signal refers to phases A and N of the backup power supply, namely the backup phase A voltage RA and the backup phase N voltage RN. This is only one example of this application. The backup power signal in this application can also be phases B and N or phases C and N of the backup power supply. No specific limitation is made in this regard.

[0051] In one possible embodiment, see Figure 4 , Figure 4 This is a schematic diagram of the circuit structure of a phase loss detection circuit provided in an embodiment of this application, as shown below. Figure 4 As shown, the phase loss detection circuit 200 includes: a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, a first diode D1, a second diode D2, a third diode D3, and a first transistor Q1; the commonly used power supply signals also include: the commonly used B-phase voltage NB and the commonly used C-phase voltage NC.

[0052] The first end of the ninth resistor R9 is electrically connected to the first end of the eleventh resistor R11, and is used to connect the commonly used A-phase voltage NA. The second end of the ninth resistor R9 is electrically connected to the first end of the tenth resistor R10, and the second end of the tenth resistor R10 is electrically connected to the anode of the first diode D1.

[0053] The cathode of the first diode D1 is electrically connected to the second terminal of the first transistor Q1, the first terminal of the ninth capacitor C9, the positive terminal of the tenth capacitor C10, the first terminal of the nineteenth resistor R19, and the first terminal of the twentieth resistor R20, respectively, and serves as the output terminal of the phase loss detection circuit 200, used to output the phase loss control signal phase_detect.

[0054] The second end of the eleventh resistor R11 is electrically connected to the first end of the twelfth resistor R12. The first end of the thirteenth resistor R13 is connected to the commonly used B-phase voltage NB. The second end of the thirteenth resistor R13 is electrically connected to the first end of the fourteenth resistor R14. The first end of the fifteenth resistor R15 is connected to the commonly used C-phase voltage NC. The second end of the fifteenth resistor R15 is electrically connected to the first end of the sixteenth resistor R16.

[0055] The second end of the twelfth resistor R12 is electrically connected to the second end of the fourteenth resistor R14, the second end of the sixteenth resistor R16, and the anode of the second diode D2. The cathode of the second diode D2 is electrically connected to the first end of the seventeenth resistor R17.

[0056] The second terminal of the seventeenth resistor R17 is electrically connected to the first terminal of the eighteenth resistor R18, the first terminal of the seventh capacitor C7, the positive terminal of the eighth capacitor C8, and the control terminal of the first transistor Q1.

[0057] The second terminal of the twentieth resistor R20 is electrically connected to the cathode of the third diode D3.

[0058] The second terminal of the eighteenth resistor R18 is connected to the second terminal of the seventh capacitor C7, the negative terminal of the eighth capacitor C8, the first terminal of the first transistor Q1, the second terminal of the ninth capacitor C9, the negative terminal of the tenth capacitor C10, the second terminal of the nineteenth resistor R19, and the anode of the third diode D3, and is used to connect to the commonly used N-phase voltage NN.

[0059] In this application, the first transistor Q1 can be a bipolar transistor or a field-effect transistor (FET). For example, when the first transistor Q1 is a bipolar transistor, its control terminal refers to the base of the bipolar transistor, and the first terminal can be the collector or emitter of the bipolar transistor, while the corresponding second terminal can be the emitter or collector of the bipolar transistor. When the first transistor Q1 is a field-effect transistor, its control terminal refers to the gate of the field-effect transistor, and the first terminal can be the drain or source of the field-effect transistor, while the corresponding second terminal can be the source or drain of the field-effect transistor.

[0060] See Figure 4When the first transistor Q1 is an NPN transistor, the control terminal of the first transistor Q1 refers to the base of the NPN transistor, the first terminal of the first transistor Q1 refers to the emitter of the NPN transistor, and the corresponding second terminal of the first transistor Q1 refers to the collector of the NPN transistor.

[0061] The phase loss detection circuit detects phase loss in the main power supply. By sampling the phase vector sum of the three-phase voltages in real time, it determines whether there is a phase loss fault in the main power supply. If there is a phase loss fault in the main power supply, it switches to the backup power supply.

[0062] See Figure 4 The phase loss detection circuit samples the A, B, C, and N phases of the commonly used power supply, namely the commonly used A phase voltage NA, commonly used B phase voltage NB, commonly used C phase voltage NC, and commonly used N phase voltage NN. After passing through the balancing resistors (i.e., the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor R16), the voltage is transmitted to the second diode D2. Then, after being divided by the seventeenth resistor R17 and the eighteenth resistor R18, and filtered by the seventh capacitor C7 and the eighth capacitor C8, the voltage is input to the base of the first transistor Q1.

[0063] Another path in the phase loss detection circuit samples the A phase of the common power supply (i.e., the common A phase voltage NA), and after being stepped down by the ninth resistor R9 and the tenth resistor R10, it is rectified by the first diode D1. After being filtered by the ninth capacitor C9 and the tenth capacitor C10, the phase loss control signal phase_detect is obtained.

[0064] When the main power supply is normal (i.e., three-phase balanced, no phase loss fault), the anode of the second diode D2 has no voltage, the base of the first transistor Q1 has no current, the first transistor Q1 is cut off, and the phase loss control signal phase_detect has voltage. When the main power supply is abnormal (i.e., three-phase unbalanced, with a phase loss fault), the anode of the second diode D2 has voltage, the base of the first transistor Q1 has current, the first transistor Q1 is turned on, and the collector of the first transistor Q1 is pulled low to the main N-phase voltage NN, and the phase loss control signal phase_detect has no voltage. The phase loss control signal phase_detect changes voltage when the main power supply has a phase loss fault and when there is no phase loss fault. Transmitting the phase loss control signal phase_detect to the control signal generation circuit 300 generates a main power supply switching signal and a backup power supply switching signal, realizing the switching between the main power supply and the backup power supply.

[0065] In one possible embodiment, see Figure 5 , Figure 5 This is a schematic diagram of the circuit structure of a control signal generation circuit provided in an embodiment of this application, as shown below. Figure 5 As shown, the control signal generation circuit 300 includes: a 21st resistor R21, a 22nd resistor R22, a 23rd resistor R23, a 24th resistor R24, a 25th resistor R25, a 26th resistor R26, a 27th resistor R27, a 28th resistor R28, a 29th resistor R29, a 30th resistor R30, a 31st resistor R31, a 32nd resistor R32, a 33rd resistor R33, a 34th resistor R34, an 11th capacitor C11, a 12th capacitor C12, a 4th diode D4, a 5th diode D5, a 6th diode D6, a 2nd transistor Q2, a 3rd transistor Q3, a 4th transistor Q4, a 5th transistor Q5, a 6th transistor Q6, a 1st optocoupler U1, and a 2nd optocoupler U2.

[0066] The first end of the twenty-first resistor R21 is used to receive the phase loss control signal phase_detect, and the second end of the twenty-first resistor R21 is electrically connected to the cathode of the fourth diode D4 and the first end of the first optocoupler U1, respectively.

[0067] The second end of the first optocoupler U1 is electrically connected to the first end of the second optocoupler U2, and the anode of the fourth diode D4 is electrically connected to the second end of the second optocoupler U2 and is used to connect to the commonly used N-phase voltage NN.

[0068] The fourth terminal of the first optocoupler U1 is electrically connected to the first terminal of the twenty-second resistor R22 and the first terminal of the twenty-third resistor R23, respectively. The second terminal of the twenty-second resistor R22 is electrically connected to the first terminal of the twenty-fifth resistor R25 and is used to connect to the common voltage N_VCC.

[0069] The second terminal of the twenty-third resistor R23 is electrically connected to the second terminal of the second transistor Q2, the first terminal of the twenty-sixth resistor R26, and the control terminal of the third transistor Q3, respectively.

[0070] The third terminal of the first optocoupler U1 is electrically connected to the first terminal of the twenty-fourth resistor R24, and the second terminal of the twenty-fourth resistor R24 ​​is electrically connected to the control terminal of the second transistor Q2.

[0071] The second terminal of the 25th resistor R25 is electrically connected to the second terminal of the third transistor Q3, the anode of the fifth diode D5, and the second terminal of the fourth transistor Q4, respectively, and serves as the first output terminal of the control signal generation circuit 300, used to output the common power supply switching signal TURN_TO_N.

[0072] The cathode of the fifth diode D5 is electrically connected to the first terminal of the twenty-seventh resistor R27. The second terminal of the twenty-seventh resistor R27 is electrically connected to the first terminal of the twenty-eighth resistor R28, the positive terminal of the eleventh capacitor C11, and the control terminal of the fourth transistor Q4.

[0073] The first terminal of the second transistor Q2, the second terminal of the twenty-sixth resistor R26, the first terminal of the third transistor Q3, the second terminal of the twenty-eighth resistor R28, the negative terminal of the eleventh capacitor C11, and the first terminal of the fourth transistor Q4 are all connected to the common power supply ground GND_N.

[0074] The third terminal of the second optocoupler U2 is electrically connected to the first terminal of the thirtieth resistor R30, the fourth terminal of the second optocoupler U2 is electrically connected to the first terminal of the twenty-ninth resistor R29, the second terminal of the twenty-ninth resistor R29 is electrically connected to the first terminal of the thirty-second resistor R32, and is connected to the backup voltage R_VCC.

[0075] The second terminal of the 32nd resistor R32 is electrically connected to the anode of the 6th diode D6, the second terminal of the 5th transistor Q5, and the second terminal of the 6th transistor Q6, respectively, and serves as the second output terminal of the control signal generation circuit 300, used to output the backup power switching signal TURN_TO_R.

[0076] The cathode of the sixth diode D6 is electrically connected to the first terminal of the thirty-third resistor R33. The second terminal of the thirty-third resistor R33 is electrically connected to the first terminal of the thirty-fourth resistor R34, the positive terminal of the twelfth capacitor C12, and the control terminal of the sixth transistor Q6.

[0077] The second terminal of the thirtieth resistor R30 is electrically connected to the first terminal of the thirty-first resistor R31 and the control terminal of the fifth transistor Q5, respectively.

[0078] The second terminal of the thirty-first resistor R31, the first terminal of the fifth transistor Q5, the second terminal of the thirty-fourth resistor R34, the negative terminal of the twelfth capacitor C12, and the first terminal of the sixth transistor Q6 are all connected to the backup power ground GND_R.

[0079] In this application, the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 can be bipolar transistors or field-effect transistors (FETs). For example, when the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are bipolar transistors, their control terminal refers to the base of the bipolar transistor, and the first terminal can be the collector or emitter of the bipolar transistor, while the corresponding second terminal can be the emitter or collector of the bipolar transistor. When the second transistor Q2, the third transistor Q3, the fourth transistor Q4, the fifth transistor Q5, and the sixth transistor Q6 are field-effect transistors (FETs), their control terminal refers to the gate of the field-effect transistor, and the first terminal can be the drain or source of the field-effect transistor, while the corresponding second terminal can be the source or drain of the field-effect transistor.

[0080] See Figure 5When the second transistor Q2, the third transistor Q3, and the fifth transistor Q5 are NPN transistors, the control terminal of the second transistor Q2, the third transistor Q3, and the fifth transistor Q5 refers to the base of the NPN transistor, the first terminal of the second transistor Q2, the third transistor Q3, and the fifth transistor Q5 refers to the emitter of the NPN transistor, and the corresponding second terminal of the second transistor Q2, the third transistor Q3, and the fifth transistor Q5 refers to the collector of the NPN transistor.

[0081] See Figure 5 When the fourth transistor Q4 and the sixth transistor Q6 are N-type MOS transistors, the control terminal of the fourth transistor Q4 and the sixth transistor Q6 refers to the gate of the N-type MOS transistor, the first terminal of the fourth transistor Q4 and the sixth transistor Q6 is the source of the N-type MOS transistor, and the corresponding second terminal of the fourth transistor Q4 and the sixth transistor Q6 is the drain of the N-type MOS transistor.

[0082] See Figure 5 When the normal power supply is normal (i.e., three-phase balanced, no phase loss fault), the phase loss control signal phase_detect has voltage. The phase loss control signal phase_detect is input to the first optocoupler U1, and the first optocoupler U1 is turned on. The normal voltage N_VCC is input to the fourth terminal of the first optocoupler U1 through the twenty-second resistor R22, and then through the third terminal of the first optocoupler U1 and the twenty-fourth resistor R24 ​​to the base of the second transistor Q2. The second transistor Q2 is turned on, and the third transistor Q3 is turned off. The normal voltage N_VCC generates the normal power supply switching signal TURN_TO_N through the twenty-fifth resistor R25. The normal power supply switching signal TURN_TO_N is at a high level.

[0083] See Figure 5 When the phase loss control signal phase_detect has voltage, it is input to the second optocoupler U2, which turns on. The backup voltage R_VCC is input to the fourth terminal of the second optocoupler U2 through the twenty-ninth resistor R29, and then to the base of the fifth transistor Q5 through the third terminal of the second optocoupler U2 and the thirtieth resistor R30. The fifth transistor Q5 turns on, and the backup voltage R_VCC generates the backup power switching signal TURN_TO_R through the thirty-second resistor R32. The backup power switching signal TURN_TO_R is low.

[0084] At the same time, one of the primary power switching signal TURN_TO_N and the backup power switching signal TURN_TO_R is at a high level and the other is at a low level. The primary power switching signal TURN_TO_N and the backup power switching signal TURN_TO_R form an interlocked state, which can avoid errors in the motor drive control logic and reduce the product failure rate.

[0085] The fifth diode D5, the twenty-seventh resistor R27, the twenty-eighth resistor R28, and the eleventh capacitor C11 form a delay circuit. After a certain delay, the fourth transistor Q4 pulls the normal power switching signal TURN_TO_N low, and the voltage will be zero, reducing the system's power consumption. Similarly, the sixth diode D6, the thirty-third resistor R33, the thirty-fourth resistor R34, and the twelfth capacitor C12 form a delay circuit. After a certain delay, the sixth transistor Q6 pulls the backup power switching signal TURN_TO_R low, and the voltage will be zero, reducing the system's power consumption.

[0086] In one possible embodiment, see Figure 6 , Figure 6 This is a schematic diagram of the circuit structure of a motor conversion control circuit provided in an embodiment of this application, as shown below. Figure 6 As shown, the motor conversion control circuit 400 includes a bidirectional thyristor control circuit 40 and a motor drive circuit 41.

[0087] The bidirectional thyristor control circuit 40 is configured to control the bidirectional thyristor to conduct according to the normal power switching signal TURN_TO_N and the backup power switching signal TURN_TO_R.

[0088] The motor drive circuit 41 is configured to drive the motor to rotate when the bidirectional thyristor is turned on, so as to control the switching between the main power supply and the backup power supply.

[0089] In one possible embodiment, see Figure 6 The bidirectional thyristor control circuit 40 includes: resistors R35 (35th), R36 (36th), R37 (37th), R38 (38th), R39 (39th), R40 (40th), R41 (41st), R42 (42nd), R43 (43rd), R44 (44th), R45 (45th), R46 (46th), R47 (47th), and R48 (48th); a first thyristor driver chip UD1; a second thyristor driver chip UD2; a third thyristor driver chip UD3; a fourth thyristor driver chip UD4; a seventh transistor Q7; an eighth transistor Q8; a first bidirectional thyristor VD1; a second bidirectional thyristor VD2; a third bidirectional thyristor VD3; and a fourth bidirectional thyristor VD4.

[0090] The first terminal of the 35th resistor R35 is connected to the common voltage N_VCC. The second terminal of the 35th resistor R35 is electrically connected to the first terminal of the first thyristor driver chip UD1. The second terminal of the first thyristor driver chip UD1 is electrically connected to the first terminal of the second thyristor driver chip UD2. The second terminal of the second thyristor driver chip UD2 is electrically connected to the second terminal of the seventh transistor Q7.

[0091] The first terminal of the thirty-eighth resistor R38 is used to connect to the common power supply switching signal TURN_TO_N. The second terminal of the thirty-eighth resistor R38 is electrically connected to the first terminal of the thirty-ninth resistor R39 and the control terminal of the seventh transistor Q7, respectively. The second terminal of the thirty-ninth resistor R39 and the first terminal of the seventh transistor Q7 are both connected to the common power supply ground GND_N.

[0092] The sixth terminal of the first thyristor driver chip UD1 is electrically connected to the first terminal of the thirty-sixth resistor R36, and the fourth terminal of the first thyristor driver chip UD1 is electrically connected to the first terminal of the thirty-seventh resistor R37 and the control terminal of the first bidirectional thyristor VD1, respectively.

[0093] The second end of the thirty-sixth resistor R36 is electrically connected to the first end of the first bidirectional thyristor VD1 and the motor drive circuit 41, respectively. The second end of the thirty-seventh resistor R37 is electrically connected to the second end of the first bidirectional thyristor VD1 and the motor drive circuit 41, respectively.

[0094] The sixth terminal of the second thyristor driver chip UD1 is electrically connected to the first terminal of the fortieth resistor R40, and the fourth terminal of the second thyristor driver chip UD1 is electrically connected to the first terminal of the forty-first resistor R41 and the control terminal of the second bidirectional thyristor VD2.

[0095] The second end of the fortieth resistor R40 is electrically connected to the first end of the second bidirectional thyristor VD2 and the motor drive circuit 41, respectively. The second end of the forty-first resistor R41 is electrically connected to the second end of the second bidirectional thyristor VD2 and is used to connect to the commonly used N-phase voltage NN.

[0096] The first terminal of the forty-second resistor R42 is connected to the backup voltage R_VCC. The second terminal of the forty-second resistor R42 is electrically connected to the first terminal of the third thyristor driver chip UD3. The second terminal of the third thyristor driver chip UD3 is electrically connected to the first terminal of the fourth thyristor driver chip UD4. The second terminal of the fourth thyristor driver chip UD4 is electrically connected to the second terminal of the eighth transistor Q8.

[0097] The first end of the forty-fifth resistor R45 is used to connect to the backup power switching signal TURN_TO_R. The second end of the forty-fifth resistor R45 is electrically connected to the first end of the forty-sixth resistor R46 and the control terminal of the eighth transistor Q8, respectively. The second end of the forty-sixth resistor R46 and the first end of the eighth transistor Q8 are both connected to the backup power ground GND_R.

[0098] The sixth terminal of the third thyristor driver chip UD3 is electrically connected to the first terminal of the forty-third resistor R43, and the fourth terminal of the third thyristor driver chip UD3 is electrically connected to the first terminal of the forty-fourth resistor R44 and the control terminal of the third bidirectional thyristor VD3, respectively.

[0099] The second end of the forty-third resistor R43 is electrically connected to the first end of the third bidirectional thyristor VD3 and the motor drive circuit 41, respectively. The second end of the forty-fourth resistor R44 is electrically connected to the second end of the third bidirectional thyristor VD3 and the motor drive circuit 41, respectively.

[0100] The sixth terminal of the fourth thyristor driver chip UD4 is electrically connected to the first terminal of the forty-seventh resistor R47, and the fourth terminal of the fourth thyristor driver chip UD4 is electrically connected to the first terminal of the forty-eighth resistor R48 and the control terminal of the fourth bidirectional thyristor VD4.

[0101] The second end of the forty-seventh resistor R47 is electrically connected to the first end of the fourth bidirectional thyristor VD4 and the motor drive circuit 41, respectively. The second end of the forty-eighth resistor R48 is electrically connected to the second end of the fourth bidirectional thyristor VD4 and is used to connect the spare N-phase voltage RN.

[0102] In this application, the seventh transistor Q7 and the eighth transistor Q8 can be bipolar transistors or field-effect transistors (FETs). For example, when the seventh transistor Q7 and the eighth transistor Q8 are bipolar transistors, their control terminals refer to the base of the bipolar transistor, the first terminal can be the collector or emitter of the bipolar transistor, and the corresponding second terminal can be the emitter or collector of the bipolar transistor; when the seventh transistor Q7 and the eighth transistor Q8 are field-effect transistors (FETs), their control terminals refer to the gate of the field-effect transistor, the first terminal can be the drain or source of the field-effect transistor, and the corresponding second terminal can be the source or drain of the field-effect transistor.

[0103] See Figure 6 When the seventh transistor Q7 and the eighth transistor Q8 are NPN transistors, the control terminal of the seventh transistor Q7 and the eighth transistor Q8 refers to the base of the NPN transistor, the first terminal of the seventh transistor Q7 and the eighth transistor Q8 refers to the emitter of the NPN transistor, and the corresponding second terminal of the seventh transistor Q7 and the eighth transistor Q8 refers to the collector of the NPN transistor.

[0104] In one possible embodiment, see Figure 6 The motor drive circuit 41 includes: a first micro switch N_AUX, a second micro switch R_AUX, a motor MOTOR, and a mode switch MODE.

[0105] The first terminal of the first micro switch N_AUX is used to connect to the common A-phase voltage NA. The third terminal of the first micro switch N_AUX is electrically connected to the first terminal of the first bidirectional thyristor VD1. The first terminal of the motor MOTOR is electrically connected to the second terminal of the first bidirectional thyristor VD1. The second terminal of the motor MOTOR is electrically connected to the second terminal of the third bidirectional thyristor VD3.

[0106] The first terminal of the second micro switch R_AUX is used to connect the backup phase A voltage RA, and the third terminal of the second micro switch R_AUX is electrically connected to the first terminal of the third bidirectional thyristor VD3.

[0107] The third terminal of the motor is electrically connected to the first terminal of the mode switch MODE, and the second terminal of the mode switch MODE is electrically connected to the first terminals of the second bidirectional thyristor VD2 and the fourth bidirectional thyristor VD4, respectively.

[0108] The second terminal of the first micro switch N_AUX is left floating, and its first and third terminals are electrically connected. After the motor rotates to its designated position, the first and second terminals of the first micro switch N_AUX are electrically connected, disconnecting the motor's power supply. Similarly, the second terminal of the second micro switch R_AUX is left floating, and its first and third terminals are electrically connected. After the motor rotates to its designated position, the first and second terminals of the second micro switch R_AUX are electrically connected, disconnecting the motor's power supply.

[0109] The mode switch MODE is in the ON state in automatic mode and in the OFF state in manual mode, requiring manual operation to switch it to the ON state. In this application, the default is automatic mode, with the mode switch MODE in the ON state.

[0110] It should be noted that the voltage connected to the first terminal of the first micro switch N_AUX and the first terminal of the second micro switch R_AUX is for supplying power to the motor. The first terminal of the first micro switch N_AUX is used to connect to the normal A-phase voltage NA, and the first terminal of the second micro switch R_AUX is used to connect to the backup A-phase voltage RA. This is merely one example in this application; the first terminal of the first micro switch N_AUX in this application can also be connected to the B-phase or C-phase of the normal power supply; the first terminal of the second micro switch R_AUX can also be connected to the B-phase or C-phase of the backup power supply. This application does not specifically limit this connection.

[0111] See Figure 6The working process of the motor switching control circuit is as follows: The normal power switching signal TURN_TO_N generated by the control signal generation circuit is transmitted to the seventh transistor Q7 through the thirty-eighth resistor R38. When the normal power switching signal TURN_TO_N is at a high level, the seventh transistor Q7 is turned on. The normal voltage N_VCC is triggered by the thirty-fifth resistor R35, the first thyristor driver chip UD1, and the second thyristor driver chip UD2. After triggering, the first bidirectional thyristor VD1 and the second bidirectional thyristor VD2 are turned on. At this time, the normal A-phase voltage NA flows through the first and third terminals of the first micro switch N_AUX, the first bidirectional thyristor VD1, the third terminal of the motor MOTOR, the forward rotation coil inside the motor, the first terminal of the motor MOTOR, the first and second terminals of the mode switch MODE, and the second bidirectional thyristor VD2, finally reaching the normal N-phase voltage NN, forming the power supply circuit for the motor, causing the motor to rotate. The linkage device connected to the motor controls the switch to switch the normal power supply to the backup power supply. Once switched to the correct position, the first and second terminals of the first micro switch N_AUX are electrically connected via a mechanical structure, disconnecting the path between the normal voltage N_VCC and the motor. As a result, the normal voltage N_VCC cannot supply power to the motor, and the motor stops rotating.

[0112] The motor switching control circuit is a symmetrical circuit. Based on the above principle, the backup power switching signal TURN_TO_R generated by the control signal generation circuit is transmitted to the eighth transistor Q8 through the forty-fifth resistor R45. When the backup power switching signal TURN_TO_R is high, the eighth transistor Q8 is turned on. The backup voltage R_VCC is triggered by the forty-second resistor R42, the third thyristor driver chip UD3, and the fourth thyristor driver chip UD4. After triggering, the third bidirectional thyristor VD3 and the fourth bidirectional thyristor VD4 are turned on. At this time, the backup A-phase voltage RA flows through the first and third terminals of the second micro switch R_AUX, the third bidirectional thyristor VD3, the second terminal of the motor MOTOR, the reverse coil inside the motor, the third terminal of the motor MOTOR, the first and second terminals of the mode switch MODE, and the fourth bidirectional thyristor VD4, finally reaching the backup N-phase voltage RN, forming the power supply circuit for the motor, causing the motor to rotate. The linkage device connected to the motor controls the switch to switch, realizing the switching from backup power to mains power. Once switched to the correct position, the first and second terminals of the second micro switch R_AUX are electrically connected via a mechanical structure, disconnecting the path between the backup voltage R_VCC and the motor. As a result, the backup voltage R_VCC cannot supply power to the motor, and the motor stops rotating.

[0113] This application also provides a substrate, including: the dual power supply switching control circuit as described above.

[0114] This application also provides a controller, including: a substrate as described above.

[0115] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dual-power supply switching control circuit for switching between a primary power supply and a backup power supply, characterized in that, The dual power supply switching control circuit includes: a power supply circuit, a phase loss detection circuit, a control signal generation circuit, and a motor conversion control circuit; the power supply circuit includes a main power supply circuit and a backup power supply circuit; the motor conversion control circuit includes a bidirectional thyristor. The control signal generation circuit is electrically connected to the main power supply circuit, the backup power supply circuit, the phase loss detection circuit, and the motor conversion control circuit, respectively. The power supply circuit is configured to convert the normal power supply signal and the backup power supply signal to generate the normal voltage and the backup voltage; and to provide power to the control signal generation circuit and the motor conversion control circuit. The phase loss detection circuit is configured to detect phase loss in the common power supply signal, obtain a phase loss control signal, and transmit the phase loss control signal to the control signal generation circuit. The control signal generation circuit is configured to output a normal power supply switching signal and a backup power supply switching signal according to the phase loss control signal; at the same time, one of the normal power supply switching signal and the backup power supply switching signal is at a high level and the other is at a low level. The motor switching control circuit is configured to control the state of the bidirectional thyristor according to the normal power supply switching signal and the backup power supply switching signal, so as to make the motor rotate and control the switching between the normal power supply and the backup power supply.

2. The dual power supply switching control circuit according to claim 1, characterized in that, The commonly used power supply circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor, a third capacitor, a first Zener diode, and a first rectifier bridge; the commonly used power supply signals include: commonly used A-phase voltage and commonly used N-phase voltage; The first end of the first resistor is used to connect to the common A-phase voltage. The second end of the first resistor is electrically connected to the first end of the second resistor. The second end of the second resistor is electrically connected to the first end of the first capacitor and the first end of the third resistor, respectively. The second end of the third resistor is electrically connected to the first end of the fourth resistor. The second end of the fourth resistor is electrically connected to the second end of the first capacitor and the first input end of the first rectifier bridge. The second input end of the first rectifier bridge is used to connect to the commonly used N-phase voltage. The first output terminal of the first rectifier bridge is electrically connected to the cathode of the first Zener diode, the positive terminal of the second capacitor, and the first terminal of the third capacitor, and serves as the output terminal of the common power supply circuit for outputting the common voltage. The second output terminal of the first rectifier bridge, the anode of the first Zener diode, the cathode of the second capacitor, and the second terminal of the third capacitor are all connected to the common power supply ground.

3. The dual power supply switching control circuit according to claim 2, characterized in that, The backup power supply circuit includes: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a second Zener diode, and a second rectifier bridge; the backup power supply signals include: backup A-phase voltage and backup N-phase voltage; The first end of the fifth resistor is used to connect to the spare phase A voltage, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor, and the second end of the sixth resistor is electrically connected to the first end of the fourth capacitor and the first end of the seventh resistor, respectively. The second end of the seventh resistor is electrically connected to the first end of the eighth resistor, and the second end of the eighth resistor is electrically connected to the second end of the fourth capacitor and the first input end of the second rectifier bridge. The second input end of the second rectifier bridge is used to connect to the spare N-phase voltage. The first output terminal of the second rectifier bridge is electrically connected to the cathode of the second Zener diode, the positive terminal of the fifth capacitor, and the first terminal of the sixth capacitor, and serves as the output terminal of the backup power supply circuit for outputting the backup voltage. The second output terminal of the second rectifier bridge, the anode of the second Zener diode, the cathode of the fifth capacitor, and the second terminal of the sixth capacitor are all connected to the backup power supply ground.

4. The dual power supply switching control circuit according to claim 2, characterized in that, The phase loss detection circuit includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, a first diode, a second diode, a third diode, and a first transistor; the commonly used power supply signals also include: commonly used B-phase voltage and commonly used C-phase voltage; The first end of the ninth resistor is electrically connected to the first end of the eleventh resistor for connecting the common A-phase voltage; the second end of the ninth resistor is electrically connected to the first end of the tenth resistor; and the second end of the tenth resistor is electrically connected to the anode of the first diode. The cathode of the first diode is electrically connected to the second terminal of the first transistor, the first terminal of the ninth capacitor, the positive terminal of the tenth capacitor, the first terminal of the nineteenth resistor, and the first terminal of the twentieth resistor, respectively, and serves as the output terminal of the phase loss detection circuit for outputting the phase loss control signal. The second end of the eleventh resistor is electrically connected to the first end of the twelfth resistor, the first end of the thirteenth resistor is connected to the commonly used B-phase voltage, the second end of the thirteenth resistor is electrically connected to the first end of the fourteenth resistor, the first end of the fifteenth resistor is connected to the commonly used C-phase voltage, and the second end of the fifteenth resistor is electrically connected to the first end of the sixteenth resistor. The second end of the twelfth resistor is electrically connected to the second end of the fourteenth resistor, the second end of the sixteenth resistor, and the anode of the second diode, respectively; the cathode of the second diode is electrically connected to the first end of the seventeenth resistor. The second end of the seventeenth resistor is electrically connected to the first end of the eighteenth resistor, the first end of the seventh capacitor, the positive terminal of the eighth capacitor, and the control terminal of the first transistor. The second end of the twentieth resistor is electrically connected to the cathode of the third diode; The second end of the eighteenth resistor is electrically connected to the second end of the seventh capacitor, the negative terminal of the eighth capacitor, the first end of the first transistor, the second end of the ninth capacitor, the negative terminal of the tenth capacitor, the second end of the nineteenth resistor, and the anode of the third diode, and is used to connect to the commonly used N-phase voltage.

5. The dual power supply switching control circuit according to claim 3, characterized in that, The control signal generating circuit includes: a 21st resistor, a 22nd resistor, a 23rd resistor, a 24th resistor, a 25th resistor, a 26th resistor, a 27th resistor, a 28th resistor, a 29th resistor, a 30th resistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a 34th resistor, an 11th capacitor, a 12th capacitor, a 4th diode, a 5th diode, a 6th diode, a 2nd transistor, a 3rd transistor, a 4th transistor, a 5th transistor, a 6th transistor, a 1st optocoupler, and a 2nd optocoupler; The first end of the 21st resistor is used to receive the phase loss control signal, and the second end of the 21st resistor is electrically connected to the cathode of the fourth diode and the first end of the first optocoupler, respectively. The second end of the first optocoupler is electrically connected to the first end of the second optocoupler, and the anode of the fourth diode is electrically connected to the second end of the second optocoupler and is used to connect to the commonly used N-phase voltage; The fourth terminal of the first optocoupler is electrically connected to the first terminal of the 22nd resistor and the first terminal of the 23rd resistor, respectively. The second terminal of the 22nd resistor is electrically connected to the first terminal of the 25th resistor and is used to connect to the common voltage. The second end of the 23rd resistor is electrically connected to the second end of the second transistor, the first end of the 26th resistor, and the control end of the third transistor, respectively. The third terminal of the first optocoupler is electrically connected to the first terminal of the 24th resistor, and the second terminal of the 24th resistor is electrically connected to the control terminal of the second transistor. The second end of the 25th resistor is electrically connected to the second end of the third transistor, the anode of the fifth diode, and the second end of the fourth transistor, and serves as the first output terminal of the control signal generation circuit for outputting the common power supply switching signal. The cathode of the fifth diode is electrically connected to the first end of the second seventeenth resistor, and the second end of the second seventeenth resistor is electrically connected to the first end of the second eighteenth resistor, the positive terminal of the eleventh capacitor, and the control terminal of the fourth transistor. The first terminal of the second transistor, the second terminal of the second sixteenth resistor, the first terminal of the third transistor, the second terminal of the second eighteenth resistor, the negative terminal of the eleventh capacitor, and the first terminal of the fourth transistor are all connected to the common power supply ground. The third end of the second optocoupler is electrically connected to the first end of the thirtieth resistor, the fourth end of the second optocoupler is electrically connected to the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is electrically connected to the first end of the thirty-second resistor, and is connected to the backup voltage; The second terminal of the thirty-second resistor is electrically connected to the anode of the sixth diode, the second terminal of the fifth transistor, and the second terminal of the sixth transistor, respectively, and serves as the second output terminal of the control signal generation circuit for outputting the backup power switching signal; The cathode of the sixth diode is electrically connected to the first end of the thirty-third resistor, and the second end of the thirty-third resistor is electrically connected to the first end of the thirty-fourth resistor, the positive terminal of the twelfth capacitor, and the control terminal of the sixth transistor. The second end of the thirtieth resistor is electrically connected to the first end of the thirty-first resistor and the control terminal of the fifth transistor, respectively. The second terminal of the thirty-first resistor, the first terminal of the fifth transistor, the second terminal of the thirty-fourth resistor, the negative terminal of the twelfth capacitor, and the first terminal of the sixth transistor are all connected to the backup power supply ground.

6. The dual power supply switching control circuit according to claim 3, characterized in that, The motor conversion control circuit includes: a bidirectional thyristor control circuit and a motor drive circuit; The bidirectional thyristor control circuit is configured to control the bidirectional thyristor to conduct according to the normal power supply switching signal and the backup power supply switching signal; The motor drive circuit is configured to drive the motor to rotate when the bidirectional thyristor is turned on, so as to control the switching between the main power supply and the backup power supply.

7. The dual power supply switching control circuit according to claim 6, characterized in that, The bidirectional thyristor control circuit includes: a 35th resistor, a 36th resistor, a 37th resistor, a 38th resistor, a 39th resistor, a 40th resistor, a 41st resistor, a 42nd resistor, a 43rd resistor, a 44th resistor, a 45th resistor, a 46th resistor, a 47th resistor, a 48th resistor, a first thyristor driver chip, a second thyristor driver chip, a third thyristor driver chip, a fourth thyristor driver chip, a seventh transistor, an eighth transistor, a first bidirectional thyristor, a second bidirectional thyristor, a third bidirectional thyristor, and a fourth bidirectional thyristor; The first end of the thirty-fifth resistor is connected to the common voltage, the second end of the thirty-fifth resistor is electrically connected to the first end of the first thyristor driver chip, the second end of the first thyristor driver chip is electrically connected to the first end of the second thyristor driver chip, and the second end of the second thyristor driver chip is electrically connected to the second end of the seventh transistor. The first end of the thirty-eighth resistor is used to connect to the common power supply switching signal. The second end of the thirty-eighth resistor is electrically connected to the first end of the thirty-ninth resistor and the control terminal of the seventh transistor. The second end of the thirty-ninth resistor and the first end of the seventh transistor are both connected to the common power supply ground. The sixth terminal of the first thyristor driver chip is electrically connected to the first terminal of the thirty-sixth resistor, and the fourth terminal of the first thyristor driver chip is electrically connected to the first terminal of the thirty-seventh resistor and the control terminal of the first bidirectional thyristor. The second end of the thirty-sixth resistor is electrically connected to the first end of the first bidirectional thyristor and the motor drive circuit, respectively; the second end of the thirty-seventh resistor is electrically connected to the second end of the first bidirectional thyristor and the motor drive circuit, respectively. The sixth terminal of the second thyristor driver chip is electrically connected to the first terminal of the fortieth resistor, and the fourth terminal of the second thyristor driver chip is electrically connected to the first terminal of the forty-first resistor and the control terminal of the second bidirectional thyristor. The second end of the fortieth resistor is electrically connected to the first end of the second bidirectional thyristor and the motor drive circuit, respectively. The second end of the forty-first resistor is electrically connected to the second end of the second bidirectional thyristor and is used to connect to the commonly used N-phase voltage. The first end of the forty-second resistor is connected to the backup voltage, the second end of the forty-second resistor is electrically connected to the first end of the third thyristor driver chip, the second end of the third thyristor driver chip is electrically connected to the first end of the fourth thyristor driver chip, and the second end of the fourth thyristor driver chip is electrically connected to the second end of the eighth transistor. The first end of the forty-fifth resistor is used to receive the backup power switching signal. The second end of the forty-fifth resistor is electrically connected to the first end of the forty-sixth resistor and the control terminal of the eighth transistor. The second end of the forty-sixth resistor and the first end of the eighth transistor are both connected to the backup power ground. The sixth terminal of the third thyristor driver chip is electrically connected to the first terminal of the forty-third resistor, and the fourth terminal of the third thyristor driver chip is electrically connected to the first terminal of the forty-fourth resistor and the control terminal of the third bidirectional thyristor. The second end of the forty-third resistor is electrically connected to the first end of the third bidirectional thyristor and the motor drive circuit, respectively; the second end of the forty-fourth resistor is electrically connected to the second end of the third bidirectional thyristor and the motor drive circuit, respectively. The sixth terminal of the fourth thyristor driver chip is electrically connected to the first terminal of the forty-seventh resistor, and the fourth terminal of the fourth thyristor driver chip is electrically connected to the first terminal of the forty-eighth resistor and the control terminal of the fourth bidirectional thyristor. The second end of the forty-seventh resistor is electrically connected to the first end of the fourth bidirectional thyristor and the motor drive circuit, respectively. The second end of the forty-eighth resistor is electrically connected to the second end of the fourth bidirectional thyristor and is used to connect to the spare N-phase voltage.

8. The dual power supply switching control circuit according to claim 7, characterized in that, The motor drive circuit includes: a first micro switch, a second micro switch, a motor, and a mode switch; The first terminal of the first micro switch is used to connect to the commonly used A-phase voltage, the third terminal of the first micro switch is electrically connected to the first terminal of the first bidirectional thyristor, the first terminal of the motor is electrically connected to the second terminal of the first bidirectional thyristor, and the second terminal of the motor is electrically connected to the second terminal of the third bidirectional thyristor. The first terminal of the second micro switch is used to connect to the backup phase A voltage, and the third terminal of the second micro switch is electrically connected to the first terminal of the third bidirectional thyristor. The third terminal of the motor is electrically connected to the first terminal of the mode switch, and the second terminal of the mode switch is electrically connected to the first terminal of the second bidirectional thyristor and the first terminal of the fourth bidirectional thyristor.

9. A substrate, characterized in that, include: The dual power supply switching control circuit as described in any one of claims 1-8.

10. A controller, characterized in that, include: The substrate as described in claim 9.

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