Protection device and electric balance valve

Abstract

The invention discloses a protection device and an electric balance valve, and the protection device comprises a power supply connecting end which is used for connecting a power supply; the driving circuit connecting end is used for connecting a driving circuit; the motor connecting end is used for connecting a motor, and the motor is connected with a transmission assembly provided with a crank; the control end is used for being connected with the controller; and the switching circuit is configured to establish the connection between the power supply connection end and the drive circuit connection end and the motor connection end when the control end supplies high level, and disconnect the connection between the motor connection end and the power supply connection end and the drive circuit connection end when the control end supplies low level. The protection device can effectively isolate the power supply of the motor from the power supply of the driving circuit through the switching circuit, and the control of the motor on the transmission assembly is not influenced while the driving circuit is prevented from being burnt out by the reverse electromotive force generated in the process of manually controlling the transmission assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of electric balance valves, and in particular to a protection device and an electric balance valve. Background Art

[0002] With the development of the heating industry and the rise of the Internet of Things, electric balance valves have emerged. Through remote precise control and adjustment technology, the electric balance valve is controlled to achieve the regulation of the opening degree of the heating pipeline.

[0003] However, in actual use scenarios or production debugging scenarios, it is still necessary to manually rotate the transmission components of the electric balance valve separately to change the valve opening. However, during the process of manually controlling the electric balance valve, the components of the circuit board of the electric balance valve are often damaged. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems in the related art to some extent. For this purpose, an object of the present invention is to propose a protection device, which can effectively isolate the power supply of the motor from the power supply of the drive circuit through a switching circuit, prevent the back electromotive force generated during the process of manually controlling the transmission components from burning out the drive circuit, and at the same time, does not affect the control of the motor over the transmission components.

[0005] A second object of the present invention is to propose an electric balance valve.

[0006] To achieve the above object, an embodiment of the first aspect of the present invention proposes a protection device, the device includes: a power connection end for connecting to a power supply; a drive circuit connection end for connecting to a drive circuit; a motor connection end for connecting to a motor, the motor being connected to a transmission component provided with a crank; a control end for connecting to a controller; a switching circuit, a first end of the switching circuit is connected to the power connection end, a second end of the switching circuit is connected to the drive circuit connection end, a third end of the switching circuit is connected to the motor connection end, a fourth end of the switching circuit is connected to the control end, and the switching circuit is configured to establish a connection between the power connection end and the drive circuit connection end and the motor connection end when a high level is supplied to the control end, and disconnect the connection between the motor connection end and the power connection end and the drive circuit connection end when a low level is supplied to the control end.

[0007] According to the protection device of the embodiment of the present invention, the power supply of the motor can be effectively isolated from the power supply of the drive circuit through the switching circuit, preventing the back electromotive force generated during the process of manually controlling the transmission components from burning out the drive circuit, and at the same time, does not affect the control of the motor over the transmission components.

[0008] In addition, the protection device proposed according to the above embodiment of the present invention may further have the following additional technical features:

[0009] According to an embodiment of the present invention, the switching circuit includes: a first switching unit, a first end of the first switching unit is connected to a first end of the switching circuit, a second end of the first switching unit is connected to a second end of the switching circuit, a third end of the first switching unit is connected to a fourth end of the switching circuit, and the first switching unit is configured to conduct the connection between the power connection end and the drive circuit connection end when a high level is supplied to the control end, and disconnect the connection between the power connection end and the drive circuit connection end when a low level is supplied to the control end; a second switching unit, a first end of the second switching unit is connected to a third end of the switching circuit, a second end of the second switching unit is connected to a second end of the switching circuit, a third end of the second switching unit is connected to a fourth end of the switching circuit, and is configured to conduct the connection between the motor connection end and the drive circuit connection end when a high level is supplied to the control end, and disconnect the connection between the motor connection end and the drive circuit connection end when a low level is supplied to the control end.

[0010] According to an embodiment of the present invention, the first switching unit includes a first switching transistor, a first resistor, and a first control transistor. A first end of the first switching transistor and a first end of the first resistor are both connected to a first end of the first switching unit. A second end of the first switching transistor is connected to a second end of the first switching unit. A third end of the first switching transistor and a second end of the first resistor are both connected to a first end of the first control transistor. A second end of the first control transistor is grounded, and a third end of the first control transistor is connected to a third end of the first switching unit.

[0011] According to an embodiment of the present invention, the first switching transistor is a PMOS transistor. A source electrode of the PMOS transistor serves as the first end of the first switching transistor. A drain electrode of the PMOS transistor serves as the second end of the first switching transistor. A gate electrode of the PMOS transistor serves as the third end of the first switching transistor. The first control transistor is an NPN transistor. A collector of the NPN transistor serves as the first end of the first control transistor. An emitter of the NPN transistor serves as the second end of the first control transistor. A base of the NPN transistor serves as the third end of the first control transistor.

[0012] According to an embodiment of the present invention, the second switch unit includes a second switch tube, a second resistor, a second control tube, and a third resistor. The first end of the second switch tube and the first end of the second resistor are connected to the first end of the second switch unit. The second end of the second switch tube is connected to the second end of the second switch unit. The third end of the second switch tube and the second end of the second resistor are connected to the first end of the second control tube. The second end of the second control tube is grounded. The third end of the second control tube is connected to the third end of the second switch unit, and the third end of the second control tube is grounded through the third resistor.

[0013] According to an embodiment of the present invention, the second switch tube is a PMOS tube. The source electrode of the PMOS tube serves as the first end of the second switch tube. The drain electrode of the PMOS tube serves as the second end of the second switch tube. The gate electrode of the PMOS tube serves as the third end of the second switch tube. The second control tube is an NPN triode. The collector of the NPN triode serves as the first end of the second control tube. The emitter of the NPN triode serves as the second end of the second control tube. The base of the NPN triode serves as the third end of the second control tube.

[0014] According to an embodiment of the present invention, the device further includes a filtering capacitor. The first end of the filtering capacitor is connected to the motor connection end, and the second end of the filtering capacitor is grounded.

[0015] According to an embodiment of the present invention, the driving end of the motor is connected to one end of the transmission assembly to drive the transmission assembly to rotate, and the crank is connected to the other end of the transmission assembly to drive the transmission assembly to rotate.

[0016] According to an embodiment of the present invention, the driving circuit includes a current detection unit, and the current detection unit is used to detect the working current of the motor.

[0017] To achieve the above object, an embodiment of the second aspect of the present invention provides an electric balance valve, which includes a power supply, a driving circuit, a motor, a controller, and a protection device as proposed in the embodiment of the first aspect of the present invention. The motor is connected to a transmission assembly provided with a crank.

[0018] The electric balance valve according to the embodiment of the present invention can effectively isolate the power supply of the motor from the power supply of the driving circuit, prevent the electric balance valve circuit board from being burned out during the process of manually controlling the opening of the electric balance valve, and at the same time, does not affect the remote control of the opening of the electric balance valve.

[0019] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0020] Figure 1 is a schematic diagram of a protection device according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of a switching circuit according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of a first switching unit and a second switch according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of a switching circuit according to a specific embodiment of the present invention;

[0024] Figure 5 is a principle block diagram of the related art for realizing the switching between a power supply and a motor by using a relay;

[0025] Figure 6 is a principle block diagram of the first modification of the present invention to a MOS transistor control circuit;

[0026] Figure 7 is a principle block diagram of the second modification of the present invention to a MOS transistor control circuit;

[0027] Figure 8 is a schematic diagram of an electric balance valve according to an embodiment of the present invention. Detailed implementation manners

[0028] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] It should be noted that through the analysis of the process of controlling the opening degree of the electric balance valve by the hand-cranked transmission assembly, the inventor found that the hand-cranked transmission assembly would drive the motor at the other end of the valve reducer to rotate, and when the hand crank of the hand-cranked transmission assembly was turned, the speed of the hand crank might be inconsistent. Once the speed was too high, it would cause damage to the components on the circuit board of the electric balance valve. Studying the cause of the damage, due to the reduction ratio, the speed at the motor end was very fast, and the output instantaneous voltage was very large, exceeding the limit safety voltage of the components on the circuit board of the electric balance valve.

[0030] The embodiments of the present invention are to prevent the circuit board of the electric balance valve from being burned out during the process of controlling the opening degree of the electric balance valve by hand, and not to affect the remote control of the opening degree of the electric balance valve. The embodiments of the present invention provide a protection device and an electric balance valve. The protection device and the electric balance valve according to the embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification and the specific implementation manners.

[0031] Figure 1 is a schematic diagram of a protection device according to an embodiment of the present invention. As Figure 1 shown, the protection device may include:

[0032] a power connection terminal for connecting to a power source;

[0033] a drive circuit connection terminal for connecting to a drive circuit;

[0034] a motor connection terminal for connecting to a motor, and the motor is connected to a transmission component provided with a crank;

[0035] a control terminal for connecting to a controller;

[0036] a switch circuit, a first end of the switch circuit is connected to the power connection terminal, a second end of the switch circuit is connected to the drive circuit connection terminal, a third end of the switch circuit is connected to the motor connection terminal, and a fourth end of the switch circuit is connected to the control terminal. The switch circuit is configured to establish a connection between the power connection terminal and the drive circuit connection terminal and the motor connection terminal when a high level is supplied to the control terminal, and to disconnect the connection between the motor connection terminal and the power connection terminal and the drive circuit connection terminal when a low level is supplied to the control terminal.

[0037] The protection device in the embodiment of the present invention includes a power connection terminal, a drive circuit connection terminal, and a motor connection terminal. The switch circuit is respectively connected to the power connection terminal, the drive circuit connection terminal, and the motor connection terminal. At the same time, the switch circuit is also connected to a control terminal. By controlling the level of the input control terminal, the switch circuit is controlled to establish or disconnect the connection between the power connection terminal and the drive circuit connection terminal and the motor connection terminal.

[0038] Specifically, the power connection terminal of the protection device is connected to a power source, the drive circuit connection terminal of the protection device is connected to a drive circuit, and the motor connection terminal of the protection device is connected to a motor. The power source is used to supply voltage to the drive circuit and the motor. Under the action of the voltage provided by the power source, the motor can drive the transmission component provided with a crank to rotate. Among them, the transmission component can also be driven by manually turning the crank. During the process of manually turning the crank to drive the transmission component to rotate, a back electromotive force will be generated in the motor.

[0039] To prevent the back electromotive force generated by the motor from burning out the drive circuit during the process of manually controlling the transmission component, the embodiment of the present invention provides a switch circuit connected to the power connection end, the drive circuit connection end, and the motor connection end. When it is necessary to manually drive the transmission component to work, the controller can be controlled to output a low level. When the control end receives the low level output by the controller, the switch circuit is controlled to disconnect the connection between the motor connection end and the power connection end and the drive circuit connection end. When it is necessary for the motor to drive the transmission component to work, the controller can be controlled to output a high level. When the control end receives the high level output by the controller, the switch circuit is controlled to establish the connection between the motor connection end and the power connection end and the drive circuit connection end.

[0040] The protection device in the embodiment of the present invention can effectively isolate the motor from the drive circuit through the control of the switch circuit, preventing the back electromotive force generated during the process of manually controlling the transmission component from burning out the drive circuit, and at the same time, not affecting the control of the motor over the transmission component.

[0041] When the protection device in the embodiment of the present invention is used for an electric balance valve, it can effectively isolate the motor in the electric balance valve from the drive circuit in the electric balance valve, preventing the circuit board of the electric balance valve from being burned out during the process of manually controlling the opening of the electric balance valve, and at the same time, not affecting the remote control of the opening of the electric balance valve.

[0042] In an embodiment of the present invention, the drive circuit includes a current detection unit, and the current detection unit is used to detect the working current of the motor.

[0043] Specifically, a current detection unit is provided in the drive circuit, and the current detection unit is used to detect the current of the motor when the motor drives the transmission component to work.

[0044] In an embodiment of the present invention, the drive end of the motor is connected to one end of the transmission component to drive the transmission component to rotate, and the crank is connected to the other end of the transmission component to drive the transmission component to rotate.

[0045] In a specific embodiment, the transmission component is a gear transmission component.

[0046] Specifically, the drive end of the motor is meshed and connected to one end of the gear transmission component to drive the gear transmission component to rotate through the drive end of the motor. The crank is connected to the other end of the gear transmission component to drive the gear transmission component to rotate by manually turning the crank.

[0047] It should be noted that the embodiment of the present invention does not limit the transmission method of the transmission component.

[0048] In an embodiment of the present invention, as Figure 2 shown, the switch circuit may include:

[0049] The first switching unit, the first end of the first switching unit is connected to the first end of the switching circuit, the second end of the first switching unit is connected to the second end of the switching circuit, the third end of the first switching unit is connected to the fourth end of the switching circuit, and the first switching unit is configured to conduct the connection between the power connection end and the drive circuit connection end when a high level is supplied to the control end, and disconnect the connection between the power connection end and the drive circuit connection end when a low level is supplied to the control end;

[0050] The second switching unit, the first end of the second switching unit is connected to the third end of the switching circuit, the second end of the second switching unit is connected to the second end of the switching circuit, the third end of the second switching unit is connected to the fourth end of the switching circuit, and is used to conduct the connection between the motor connection end and the drive circuit connection end when a high level is supplied to the control end, and disconnect the connection between the motor connection end and the drive circuit connection end when a low level is supplied to the control end.

[0051] Specifically, the first switching unit is connected between the power connection end and the drive circuit connection end, and the second switching unit is connected between the drive circuit connection end and the motor connection end.

[0052] When it is necessary to manually drive the transmission component to work, control the controller to output a low level. Under the action of the low level input at the control ends of the first switching unit and the second switching unit, the first switching unit disconnects the connection between the motor connection end and the drive circuit connection end, and the second switching unit disconnects the connection between the drive circuit connection end and the power connection end.

[0053] When it is necessary to drive the transmission component to work by the motor, control the controller to output a high level. Under the action of the high level input at the control ends of the first switching unit and the second switching unit, the first switching unit establishes the connection between the motor connection end and the drive circuit connection end, and the second switching unit establishes the connection between the drive circuit connection end and the power connection end.

[0054] In an embodiment of the present invention, as Figure 3 and Figure 4 shown, the first switching unit may include a first switching transistor Q1, a first resistor R1, and a first control transistor Q2. The first end of the first switching transistor Q1 and the first end of the first resistor R1 are both connected to the first end of the first switching unit. The second end of the first switching transistor Q1 is connected to the second end of the first switching unit. The third end of the first switching transistor Q1 and the second end of the first resistor R1 are both connected to the first end of the first control transistor Q2. The second end of the first control transistor Q2 is grounded, and the third end of the first control transistor Q2 is connected to the third end of the first switching unit.

[0055] Specifically, when the level signal MOTOR_ON input at the control end is at a low level, the first control transistor Q2 can control the first switching transistor Q1 to turn off. When the level signal MOTOR_ON input at the control end is at a high level, the first control transistor Q2 can control the first switching transistor Q1 to turn on.

[0056] In a specific embodiment, as Figure 4 shown, the first switching transistor Q1 is a PMOS transistor. The source (S) of the PMOS transistor serves as the first end of the first switching transistor Q1, the drain (D) of the PMOS transistor serves as the second end of the first switching transistor Q1, the gate (G) of the PMOS transistor serves as the third end of the first switching transistor Q1. The first control transistor Q2 is an NPN transistor. The collector (C) of the NPN transistor serves as the first end of the first control transistor Q2, the emitter (E) of the NPN transistor serves as the second end of the first control transistor Q2, and the base (B) of the NPN transistor serves as the third end of the first control transistor Q2.

[0057] Implementably, a PMOS transistor is used as the first switching transistor Q1, and an NPN transistor is used as the first control transistor Q2.

[0058] In an embodiment of the present invention, as Figure 3 and Figure 4 shown, the second switching unit may include a second switching transistor Q3, a second resistor R2, a second control transistor Q4, and a third resistor R3. The first end of the second switching transistor Q3 and the first end of the second resistor R2 are connected to the first end of the second switching unit. The second end of the second switching transistor Q3 is connected to the second end of the second switching unit. The third end of the second switching transistor Q3 and the second end of the second resistor R2 are connected to the first end of the second control transistor Q4. The second end of the second control transistor Q4 is grounded. The third end of the second control transistor Q4 is connected to the third end of the second switching unit. The third end of the second control transistor Q4 is grounded through the third resistor R3.

[0059] Specifically, when the level signal MOTOR_ON input at the control end is at a low level, the second control transistor Q4 can control the second switching transistor Q3 to turn off. When the level signal MOTOR_ON input at the control end is at a high level, the second control transistor Q4 can control the second switching transistor Q3 to turn on.

[0060] In a specific embodiment, as Figure 4As shown, the second switching transistor Q3 is a PMOS transistor. The source (S) of the PMOS transistor serves as the first terminal of the second switching transistor Q3, the drain (D) of the PMOS transistor serves as the second terminal of the second switching transistor Q3, and the gate (G) of the PMOS transistor serves as the third terminal of the second switching transistor Q3. The second control transistor Q4 is an NPN transistor. The collector (C) of the NPN transistor serves as the first terminal of the second control transistor Q4, the emitter (E) of the NPN transistor serves as the second terminal of the second control transistor Q4, and the base (B) of the NPN transistor serves as the third terminal of the second control transistor Q4.

[0061] Implementable, a PMOS transistor is used as the second switching transistor Q3, and an NPN transistor is used as the second switching transistor Q3.

[0062] It should be noted that the first switching transistor Q1 and the second switching transistor Q3 are PMOS transistors because when the PMOS transistors are fully turned on, their resistance becomes very small. This enables current to flow smoothly between the drain (D) and source (S) of the PMOS transistor, and the voltage drop generated is also small, thereby effectively reducing the conduction loss. When both the first switching transistor Q1 and the second switching transistor Q3 are turned on, the voltage MOTOR_VCC applied to the motor and the power supply voltage VCC are almost the same.

[0063] It should be noted that when the driving voltage of the motor decreases, the output power of the motor will decrease accordingly, which may not meet the requirements of the load, resulting in a slower operating speed of the device, overheating of the motor due to overload, increased starting difficulty, or inability to operate normally.

[0064] As follows Figure 4 The principle of the switching circuit in the implementation of the present invention will be described in detail with reference to the specific schematic diagram shown below:

[0065] Refer to Figure 4 , when the level signal MOTOR_ON input at the control terminal is high, the NPN transistors Q2 and Q4 are turned on, and the gates (G) of the PMOS transistors Q1 and Q3 are at low level, and the PMOS transistors Q1 and Q3 are fully turned on. Thus, the voltage MOTOR_VCC applied to the motor and the power supply VCC are almost the same. When the level signal MOTOR_ON input at the control terminal is low, since the NPN transistors Q2 and Q4 are cut off and the PMOS transistors Q1 and Q3 are cut off, at this time, the hand crank drives the transmission component to rotate, and the back electromotive force generated by the motor reaches the motor connection end, and the back electromotive force generated by the motor cannot reach the drive circuit connection end INA_VCC. Due to the reverse cut-off block of the body diode in the PMOS transistor Q3 and the drain-gate voltage being much smaller than the conduction voltage, the back electromotive force cannot be transmitted to the drive circuit connection end INA_VCC. The back electromotive force caused by the crank is completely isolated, achieving the effect of protecting the drive circuit board.

[0066] In one embodiment of the present invention, as Figure 4 shown, the protection device may further include: a filter capacitor C1, a first end of the filter capacitor C1 is connected to the motor connection end, and a second end of the filter capacitor C1 is grounded.

[0067] The embodiment of the present invention realizes effective isolation between the power supply MOTOR_VCC of the motor and the power supply INA_VCC of the drive circuit through the idea of symmetric protection for input and output.

[0068] It should be noted that the following is the evolution process of the entire design process of the switch circuit in the embodiment of the present invention:

[0069] As Figure 5 shown, the related art uses a relay to realize the switching connection between the power supply and the motor. The related art controls the on / off of the triode Q5 through MOTOR_ON of the IO of the microcontroller, thereby controlling the suction of the relay K1 and controlling the switch of the control board power supply VCC and the motor power supply MOTOR_VCC. The power supply of the current detection circuit is supplied by VCC. In this solution, the relay needs to be sucked in when the motor works and disconnected when it does not work. At this time, the back electromotive force of the motor cannot be transmitted to the drive board. Disadvantages: 1. The cost of the relay is high; 2. The current detection circuit works all the time, increasing the power consumption of the control board.

[0070] Figure 6 is the principle block diagram of the first modification of the present invention into a MOS transistor control circuit. Refer to Figure 6 , this embodiment is built by discrete components, and uses the conduction direction of the body diode of the MOS transistor Q7 to control the on / off of the power supply to the motor. When MOTOR_ON of the IO of the microcontroller is at a low level, the MOS transistor Q6 conducts, and the power supply INA_VCC of the current detection circuit works. The body diode of the MOS transistor Q7 conducts forward, and the power supply voltage MOTOR_VCC of the motor is connected to the power supply, and the motor runs normally. When the microcontroller controls the IO port MOTOR_ON to be at a high level, the MOS transistor Q7 on the drive board does not work at this time. When the gear end is shaken, the motor generates a back electromotive force. Since the body diode of the MOS transistor Q7 is reversely cut off and the diode D2 is reversely cut off, the back electromotive force generated by the motor cannot reach the control terminal power supply, playing a protective role for other components of the common power supply. The disadvantages of this solution: Due to the reverse cut-off characteristic of the diode D2, the MOS transistor Q7 is not fully conducted, and there is a voltage drop when the body diode of the MOS transistor Q7 conducts forward, resulting in the motor power supply not reaching the rated voltage.

[0071] Figure 7 is the principle block diagram of the second modification of the present invention into a MOS transistor control circuit. Refer to Figure 7 , in order to solve Figure 6When the MOS transistor Q7 is not fully conducting, there is a voltage drop problem. The gates of MOS transistors Q6 and Q7 are connected in parallel to the collector of transistor Q8. When MOTOR_ON is at a high level and the MOS transistor conducts, the gates of MOS transistors Q6 and Q7 are directly at a low level, and MOS transistors Q6 and Q7 are fully conducting. The voltages of MOTOR_VCC and VCC are almost the same. When MOS transistors Q6 and Q7 are cut off, at this time, when the gear end is shaken, the motor generates a back electromotive force and cannot reach VCC. However, at this time, the current detection circuit has been damaged. Analyzing the reason, the body diode of MOS transistor Q7 conducts forward, introducing the back electromotive force into the access terminal INA_VCC of the current detection circuit, exceeding the safety voltage, and the current detection circuit is damaged.

[0072] In the embodiment of the present invention, the protection device built by discrete components replaces the original relay switching scheme, which can reduce the back electromotive force generated by the motor caused by the shaking of the electric valve and burn out the circuit components. The present invention adds a protection circuit of a drive circuit board composed of discrete components to prevent the instantaneous back electromotive force impact generated by the motor.

[0073] In the protection device in the embodiment of the present invention, according to the requirement, the switch circuit is controlled to switch the on and off between the motor connection end and the drive circuit connection end, effectively preventing the back electromotive force of the motor from burning out the drive board circuit; the simple switch circuit structure of discrete components can replace the relay, reducing the product cost while also reducing the electromagnetic interference to the drive circuit; by switching the motor power supply through the switch circuit, the power consumption during the non-working time of the electric balance valve is reduced.

[0074] The present invention provides an electric balance valve.

[0075] Figure 8 It is a schematic diagram of an electric balance valve according to an embodiment of the present invention. As Figure 8 shown, the electric balance valve may include a power supply, a drive circuit, a motor, a controller, and the protection device as described above. The motor is connected to a transmission component provided with a crank.

[0076] In an embodiment of the present invention, the drive circuit may include a current detection unit.

[0077] Specifically, the current detection unit is used to detect the current when the motor drives the transmission component to work.

[0078] In the electric balance valve in the embodiment of the present invention, by using the above protection device, the power supply MOTOR_VCC of the motor in the electric balance valve and the power supply INA_VCC of the drive circuit in the electric balance valve can be effectively isolated, preventing the electric balance valve circuit board from being burned out during the process of manually controlling the opening of the electric balance valve, and at the same time, not affecting the remote control of the opening of the electric balance valve, and also having the advantages of low cost and low power consumption.

[0079] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0080] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0081] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0082] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "connected to", "fixed" etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0083] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact via an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher level height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level height than the second feature.

[0084] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A protection device, characterized in that, The device includes: A power connection terminal for connecting to a power source; A drive circuit connection terminal for connecting to a drive circuit; A motor connection terminal for connecting to a motor, and the motor is connected to a transmission component provided with a crank; A control terminal for connecting to a controller; A switch circuit, wherein a first end of the switch circuit is connected to the power connection terminal, a second end of the switch circuit is connected to the drive circuit connection terminal, a third end of the switch circuit is connected to the motor connection terminal, and a fourth end of the switch circuit is connected to the control terminal. The switch circuit is configured to establish a connection between the power connection terminal and the drive circuit connection terminal and the motor connection terminal when the control terminal supplies a high level, and disconnect the connection between the motor connection terminal and the power connection terminal and the drive circuit connection terminal when the control terminal supplies a low level.

2. The protection device according to claim 1, characterized in that, The switch circuit includes: A first switch unit, a first end of the first switch unit is connected to the first end of the switch circuit, a second end of the first switch unit is connected to the second end of the switch circuit, and a third end of the first switch unit is connected to the fourth end of the switch circuit. The first switch unit is configured to conduct the connection between the power connection terminal and the drive circuit connection terminal when the control terminal supplies a high level, and disconnect the connection between the power connection terminal and the drive circuit connection terminal when the control terminal supplies a low level; A second switch unit, a first end of the second switch unit is connected to the third end of the switch circuit, a second end of the second switch unit is connected to the second end of the switch circuit, and a third end of the second switch unit is connected to the fourth end of the switch circuit, and is configured to conduct the connection between the motor connection terminal and the drive circuit connection terminal when the control terminal supplies a high level, and disconnect the connection between the motor connection terminal and the drive circuit connection terminal when the control terminal supplies a low level.

3. The protection device according to claim 2, characterized in that, The first switch unit includes a first switch tube, a first resistor, and a first control tube. A first end of the first switch tube and a first end of the first resistor are both connected to the first end of the first switch unit. A second end of the first switch tube is connected to the second end of the first switch unit. A third end of the first switch tube and a second end of the first resistor are both connected to a first end of the first control tube. A second end of the first control tube is grounded, and a third end of the first control tube is connected to the third end of the first switch unit.

4. The protection device according to claim 3, wherein, The first switch tube is a PMOS tube. A source of the PMOS tube serves as the first end of the first switch tube. A drain of the PMOS tube serves as the second end of the first switch tube. A gate of the PMOS tube serves as the third end of the first switch tube. The first control tube is an NPN triode. A collector of the NPN triode serves as the first end of the first control tube. An emitter of the NPN triode serves as the second end of the first control tube. A base of the NPN triode serves as the third end of the first control tube.

5. The protection device according to claim 2, characterized in that, The second switch unit includes a second switch tube, a second resistor, a second control tube, and a third resistor. The first end of the second switch tube and the first end of the second resistor are connected to the first end of the second switch unit. The second end of the second switch tube is connected to the second end of the second switch unit. The third end of the second switch tube and the second end of the second resistor are connected to the first end of the second control tube. The second end of the second control tube is grounded. The third end of the second control tube is connected to the third end of the second switch unit, and the third end of the second control tube is grounded through the third resistor.

6. The protection device according to claim 5, characterized in that, The second switch tube is a PMOS tube. The source of the PMOS tube serves as the first end of the second switch tube. The drain of the PMOS tube serves as the second end of the second switch tube. The gate of the PMOS tube serves as the third end of the second switch tube. The second control tube is an NPN triode. The collector of the NPN triode serves as the first end of the second control tube. The emitter of the NPN triode serves as the second end of the second control tube. The base of the NPN triode serves as the third end of the second control tube.

7. The protection device according to claim 1, characterized in that, The device further includes: A filter capacitor. The first end of the filter capacitor is connected to the motor connection end, and the second end of the filter capacitor is grounded.

8. The protection device according to claim 1, wherein The driving end of the motor is connected to one end of the transmission assembly to drive the transmission assembly to rotate. The crank is connected to the other end of the transmission assembly to drive the transmission assembly to rotate.

9. The protection device according to claim 1, characterized in that The driving circuit includes a current detection unit for detecting the working current of the motor.

10. An electric balance valve, characterized in that, It includes a power supply, a driving circuit, a motor, a controller, and a protection device as described in any one of claims 1-9. The motor is connected to a transmission assembly provided with a crank.

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