A drive voltage control circuit and an electric drive device

Abstract

The application discloses a driving voltage control circuit and an electric driving device, wherein the driving voltage control circuit comprises a master control subcircuit and a heating subcircuit; the heating subcircuit comprises a heating execution element and a heating control unit electrically connected with the heating execution element; the heating control unit comprises a heating relay and a heating temperature control assembly; the heating temperature control assembly is used for controlling the on-off of the heating relay according to the temperature of the electric driving device; the heating relay comprises a heating relay switch and a heating relay coil, and is used for transmitting a heating voltage to the heating execution element according to the control of the heating temperature control assembly; the master control subcircuit comprises a master control relay and a master control temperature control assembly; the master control temperature control assembly is used for controlling the on-off of the master control relay according to the temperature of the electric driving device. The technical scheme disclosed by the application can avoid the working failure of the electric driving device when starting in an ultralow-temperature environment or a high-temperature environment.

Description

Technical Field

[0001] This application relates to the field of drive control, and in particular to a drive voltage control circuit and an electric drive device. Background Technology

[0002] Electric drive equipment is a drive device that provides linear or rotary motion. It is typically used in conjunction with valves in fluid transport pipeline systems, primarily to control the opening and closing of valves and to regulate flow rate.

[0003] Currently, existing electric drive equipment generally operates in environments ranging from -40℃ to 70℃. However, in the northern regions of the Earth, the temperature difference between winter and summer is significant, with winter temperatures reaching as low as -70℃ and summer temperatures reaching 30℃. Since the SMT electronic components of electric drive equipment are difficult to operate normally under conditions of -70℃, designing and developing a drive voltage control circuit suitable for ultra-low temperatures to ensure the operation of electric drive equipment at extremely low temperatures is urgently needed. Summary of the Invention

[0004] To ensure that the SMT electronic components of the electric drive equipment can operate normally at ultra-low temperatures, this application provides a drive voltage control circuit and an electric drive equipment.

[0005] This application provides a drive voltage control circuit and an electric drive device, which adopt the following technical solution:

[0006] A drive voltage control circuit is provided for controlling the drive voltage transmitted to an electric actuator. The drive voltage control circuit includes a main control sub-circuit and a heating sub-circuit. The main control sub-circuit is used to control the on / off state of the drive voltage to control the start and stop of the electric actuator. The heating sub-circuit is used to heat the electric actuator before it is driven to work when the temperature of the electric actuator is lower than a preset low temperature heating start threshold.

[0007] The heating sub-circuit includes a heating actuator and a heating control unit electrically connected to the heating actuator. The heating control unit includes a heating relay and a heating temperature control component. The heating temperature control component is used to control the on / off state of the heating relay according to the temperature of the electric actuator. The heating relay includes a heating relay switch and a heating relay coil, and is used to transmit heating voltage to the heating actuator according to the control of the heating temperature control component.

[0008] The main control sub-circuit includes a main control relay and a main control temperature control component. The main control temperature control component is used to control the on / off state of the main control relay according to the temperature of the electric actuator. The main control relay includes a main control relay switch module and a main control relay coil, and is used to transmit the driving voltage to the electric actuator according to the control of the main control temperature control component.

[0009] The heating temperature control component and the main control temperature control component work together according to the temperature of the electric actuator, so that the main control sub-circuit transmits the drive voltage to the electric actuator only when the temperature of the electric actuator is higher than the preset threshold.

[0010] The above technical solution includes a heating sub-circuit and a main control sub-circuit. The heating sub-circuit transmits heating voltage to the heating actuator through a heating relay based on the temperature of the electric actuator sensed by the heating temperature control component, thereby changing the temperature of the electric actuator. Subsequently, the main control sub-circuit outputs drive voltage to the electric actuator through a main control relay based on the temperature of the electric actuator sensed by the main control temperature control component, thereby controlling the normal operation of the electric actuator.

[0011] The heating temperature control component in the heating sub-circuit senses the temperature of the electric actuator and controls the circuit containing the heating relay coil to conduct, causing the heating relay coil to generate a magnetic field. This alters the on / off state of the heating relay switch, thereby controlling the operation of the heating actuator element in the heating sub-circuit based on the temperature of the electric actuator. This ensures that the heating actuator operates even at extremely low temperatures, thus raising the overall temperature of the electric actuator. The main control sub-circuit controls the on / off state of the main control relay coil based on the detected temperature of the electric actuator. This changes the operating state of the main control relay switch module when the temperature is suitable, thereby driving the electric actuator to operate normally.

[0012] By adopting the above technical solution, the heating sub-circuit can automatically heat up to change the temperature of the electric actuator, and control the operation of the electric actuator based on the temperature. This ensures that the SMT electronic components in the electric actuator work in a suitable temperature environment, and avoids damage to the SMT electronic components due to forced operation at excessively high or low temperatures.

[0013] Optionally, the heating relay switch has a first input terminal, a second input terminal, and an output terminal. The heating temperature control component includes a first temperature control switch and a second temperature control switch. The first input terminal of the heating relay switch is electrically connected to a first voltage source, and the output terminal of the heating relay switch is electrically connected to the heating actuator. One end of the heating relay coil is electrically connected to one end of the first temperature control switch, and the other end of the heating relay coil is electrically connected to a second voltage source. The other end of the first temperature control switch is grounded, and one end of the second temperature control switch is electrically connected to the second input terminal of the heating relay switch. The other end of the second temperature control switch is electrically connected to a third voltage source.

[0014] By adopting the above technical solution, a first temperature control switch is used to control the on / off state of the circuit containing the heating relay coil. After the heating relay coil becomes conductive, it generates a magnetic field that controls the heating relay switch to change its operating state. The heating relay switch has two switchable operating states. In one state, a first voltage source supplies power to the heating actuator to increase the temperature of the electric actuator. In the other state, a third voltage source supplies power to the heating actuator. Simultaneously, a second temperature control switch is also installed in the circuit where the third voltage source supplies power to the heating element to control the on / off state of this circuit. This achieves temperature control of the electric actuator, preventing the temperature from exceeding the tolerance of the SMT electronic components in the electric actuator, thus affecting the normal operation of the electric actuator.

[0015] Therefore, the first temperature control switch changes the working state of the heating relay switch by controlling whether the heating relay coil is energized or not, thereby switching between using the first voltage source or the third voltage source to heat the heating actuator.

[0016] Optionally, the first temperature control switch is open when the temperature of the electric actuator is lower than the high-temperature heating start threshold, and closed when the temperature of the electric actuator is not lower than the high-temperature heating start threshold; the second temperature control switch is open when the temperature of the electric actuator is lower than the low-temperature heating start threshold, and closed when the temperature of the electric actuator is not lower than the low-temperature heating start threshold; the high-temperature heating start threshold is less than the low-temperature heating start threshold; and the voltage provided by the first voltage source is higher than that of the third voltage source.

[0017] By adopting the above technical solution, when the temperature of the electric actuator is below the high-temperature heating start-up threshold, the first temperature control switch is open and the second temperature control switch is closed. At this time, the heating relay coil is not energized, and the first input terminal and output terminal of the heating relay switch are connected, allowing the first voltage source to power the heating actuator and achieve rapid heating. When the temperature of the electric actuator is higher than or equal to the high-temperature heating start-up threshold but lower than the low-temperature heating start-up threshold, the first temperature control switch and the second temperature control switch are closed. At this time, the circuit containing the heating relay coil is energized, and the second terminal of the heating relay switch is electrically connected to the output terminal, causing the circuit from the first voltage source to the heating actuator to be disconnected, and the circuit from the third voltage source to the heating actuator to be energized. The third voltage source is used to power the heating actuator, achieving low-speed energy-saving heating. When the temperature of the electric actuator is higher than or equal to the low-temperature heating start threshold, the first temperature control switch closes and the second temperature control switch opens. At this time, the circuit where the heating relay coil is located is turned on, and the second input terminal of the heating relay switch is connected to the output terminal. However, since the second temperature control switch is turned off, the circuit of the third voltage source to the heating actuator is also turned off, and the heating actuator stops working, interrupting the heating of the electric actuator. This prevents the temperature of the heating actuator from becoming too high and exceeding the temperature tolerance range of the STM circuit components, thus ensuring the working life of the STM circuit components in the entire electric actuator.

[0018] Optionally, the low-temperature heating start-up threshold is 50°C, the high-temperature heating start-up threshold is -30°C, the first voltage source outputs 380V AC, the second voltage source outputs 24V DC, and the third voltage source outputs 220V AC.

[0019] In this technical solution, when the temperature is above or equal to 50℃, both the first and second temperature control switches are open, indicating that the current temperature is too high for heating, and both the first and third voltage sources interrupt power supply to the heating actuator. When the temperature is above or equal to -30℃ but below 50℃, both the first and second temperature control switches are closed, and the circuit containing the heating relay coil is activated, connecting the second input and output terminals of the heating relay switch. Power is then supplied to the heating actuator from the second voltage source for low-temperature heating. When the temperature is below -30℃, the first temperature control switch is open, the heating relay coil is not energized, and the first and output terminals of the heating relay switch are electrically connected. Power is then supplied to the heating actuator from the first voltage source for high-temperature heating.

[0020] Optionally, the main control relay switch module includes a main control relay main switch and a main control relay auxiliary switch. The main control relay coil has an input terminal, a first output terminal, and a second output terminal. The main control temperature control component includes a third temperature control switch and a fourth temperature control switch. The first output terminal of the main control relay coil is electrically connected to one end of the main control relay auxiliary switch, and the second output terminal of the main control relay coil is electrically connected to one end of the third temperature control switch. The input terminal of the main control relay coil is electrically connected to a second voltage source. The other end of the main control relay auxiliary switch is electrically connected to one end of the fourth temperature control switch. The other ends of both the third and fourth temperature control switches are grounded. One end of the main control relay main switch is electrically connected to the fourth voltage source, and the other end of the main control relay main switch is electrically connected to the electric actuator.

[0021] By employing the above technical solution, and simultaneously using a third and fourth temperature control switch to control the on / off state of the circuit containing the coil of the main control relay, the opening and closing of the main switch of the main control relay is changed, thereby achieving control over the power supply from the fourth voltage source to the electric actuator. Furthermore, the third and fourth temperature control switches in this solution can form an interlock within a certain temperature range to ensure stable operation within that temperature range.

[0022] Optionally, the third temperature control switch is open when the temperature of the electric actuator is lower than the self-locking start threshold and closed when the temperature of the electric actuator is not lower than the self-locking start threshold; the fourth temperature control switch is open when the temperature of the electric actuator is lower than the self-locking minimum threshold and turned on when the temperature of the electric actuator is not lower than the self-locking minimum threshold; wherein the self-locking start threshold is greater than the self-locking minimum threshold.

[0023] By adopting the above technical solution, when the temperature of the electric actuator is lower than the minimum self-locking threshold, the third temperature control switch is disconnected, the fourth temperature control switch is disconnected, the auxiliary switch of the main control relay in the main control relay switch module is disconnected, the circuit where the main control relay coil is located is disconnected, and the main switch of the main control relay in the relay switch module is also disconnected accordingly. At this time, the fourth voltage source cannot supply the driving voltage to the electric actuator, thus realizing the self-protection of the electric actuator at low temperature.

[0024] When the temperature of the electric actuator exceeds the self-locking start threshold, the third temperature control switch closes, the fourth temperature control switch closes, and the circuit "second voltage source - main control relay coil - third temperature control switch - ground wire" is completed. After the main control relay coil conducts electricity, it generates a magnetic field, causing both the main control relay main switch and the main control relay auxiliary switch to switch from the open state to the closed state. This completes the circuit "fourth voltage source - main control relay main switch - electric actuator". The fourth voltage source supplies power to the electric actuator for normal operation. It also completes the circuit "second voltage source - heating relay coil - fourth temperature control switch - ground wire", thereby further ensuring that the main control relay coil is locked in the energized state.

[0025] When the temperature of the electric actuator is equal to or higher than the minimum self-locking threshold but lower than the self-locking start threshold, the third temperature control switch opens and the fourth temperature control switch closes. At this time, if the temperature of the electric actuator is currently rising, the opening of the third temperature control switch disconnects the "second voltage source - third temperature control switch - ground" circuit. The "second voltage source - main control circuit auxiliary switch - fourth temperature control switch - ground" circuit remains open even if the fourth temperature control switch is closed. The circuit containing the main control relay coil is not conductive, causing both the main control relay main switch and the main control relay auxiliary switch to remain open, preventing the fourth voltage source from supplying power to the electric actuator.

[0026] If the temperature of the electric actuator is decreasing, the third temperature control switch opens, breaking the circuit of "second voltage source - third temperature control switch - ground". In the previous time period, the auxiliary switch of the main control relay was closed, and at this time the fourth temperature control switch also closes, making the circuit of "second voltage source - main control circuit auxiliary switch - fourth temperature control switch - ground" conduct. The circuit where the main control relay coil is located is conducting, and the main control relay coil generates a magnetic field that causes the main control relay main switch to close. The fourth voltage source still supplies power to the electric actuator.

[0027] In the specific implementation of this case, as long as the temperature rises above the self-locking start threshold for the first time, even if the temperature fluctuates within the range of the self-locking start threshold to the minimum self-locking threshold, the main circuit auxiliary switch will remain closed to ensure that the electric actuator works normally under the driving voltage when the temperature drops slightly.

[0028] Optionally, the self-locking start threshold is -30℃, the self-locking minimum threshold is -45℃, and the second voltage source outputs 24V DC.

[0029] Optionally, the heating sub-circuit further includes a heating arc suppression component, which includes a first arc suppression component and a second arc suppression component. One end of the first arc suppression component is electrically connected to the first input terminal of the heating relay switch, and the other end of the first arc suppression component is electrically connected to the output terminal of the heating relay switch. One end of the second arc suppression component is electrically connected to the second input terminal of the heating relay switch, and the other end of the second arc suppression component is electrically connected to the output terminal of the heating relay switch. The first arc suppression component includes a first arc suppression capacitor and a second arc suppression capacitor connected in series, and the second arc suppression component includes a third arc suppression capacitor and a fourth arc suppression capacitor connected in series.

[0030] Considering that pulsed electric sparks can easily be generated during the state transition of the heating relay switch, the first arc suppression component is set between the first input terminal and the output terminal of the heating relay switch, so that the first arc suppression component can absorb the pulse voltage between the first input terminal and the output terminal to eliminate electric sparks. The second arc suppression component is set between the second input terminal and the output terminal of the heating relay switch, so that the second arc suppression component can absorb the pulse voltage between the second input terminal and the output terminal to eliminate electric sparks and improve the safety of the overall circuit.

[0031] Optionally, the main control sub-circuit further includes a main control arc suppression component. One end of the main control arc suppression component is electrically connected to one end of the main control relay main switch, and the other end of the main control arc suppression component is electrically connected to the other end of the main control relay main switch. The main control arc suppression component includes a fifth arc suppression capacitor and a sixth arc suppression capacitor connected in series.

[0032] By adopting the above technical solution, the main control arc suppression component absorbs the pulse current generated by the main control relay main switch at the moment of switching, thereby eliminating electric sparks and improving the safety of the overall circuit.

[0033] The present invention also provides an electric drive device, including an electric actuator, a power supply circuit, and any of the above-mentioned drive voltage control circuits. The electric actuator is electrically connected to the main control sub-circuit of the drive voltage control circuit to receive the drive voltage transmitted by the main control sub-circuit. The power supply circuit includes a first transformer, a second transformer, and a rectifier. One end of the first transformer is electrically connected to a total voltage source, and the other end of the first transformer is provided with a first output node and a second output node. The first output node outputs a first voltage source, and the second output node outputs a fourth voltage source. One end of the second transformer is connected to the first voltage source, and the other end of the second transformer is provided with a third output node and a fourth output node. The third output node outputs a third voltage source, and the fourth output node is electrically connected to the input terminal of the rectifier. The output terminal of the rectifier outputs a second voltage source.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The heating sub-circuit controls the on / off state of the heating relay according to the temperature of the heating temperature control component, and then transmits the heating voltage to the heating actuator, so that the heating element can work according to the heating voltage, thereby realizing the automatic heating operation of the heating actuator of the heating sub-circuit based on the temperature, so as to increase the temperature of the electric actuator.

[0036] 2. The main control sub-circuit transmits the drive voltage to the electric actuator according to the temperature control, and controls the electric actuator to operate normally or be used in a protective disconnection according to the temperature of the electric actuator, so as to avoid the use of the SMT electronic components of the electric actuator in ultra-low temperature environment or high temperature environment.

[0037] 3. In this case, the heating sub-circuit has two heating schemes: one uses a first voltage source to power the heating actuator, and the other uses a third voltage source. During heating, the heating temperature control component selects which voltage source to supply power to the heating actuator, thereby adjusting the heating voltage and changing the heating efficiency. Simultaneously, the second temperature control switch in this heating sub-circuit controls the interruption of power supply from the third voltage source to the heating actuator at high temperatures, thus stopping heating at high temperatures to prevent the electric actuator from overheating and damaging the SMT electronic components, affecting user experience.

[0038] 4. Considering that the heating temperature is significantly affected by the environment in practical applications, it is possible that after the heating sub-circuit has just raised the temperature to value a, the user moves the electric actuator to an area with a lower ambient temperature, causing the temperature to drop instantly to value b. During this movement, the electric actuator is required to maintain its working state as much as possible. Therefore, the main control circuit in this case is equipped with a main control relay main switch and a main control relay auxiliary switch in the main control switch module. The main control relay auxiliary switch ensures that even if the temperature drops after heating, the main control relay coil remains energized, ensuring that the fourth voltage source controlled by the relay main switch supplies power to the electric actuator, thereby maintaining the stable operation of the electric actuator.

[0039] 5. In this case, a first arc-suppression component is set between the first input terminal and the output terminal of the heating relay switch, and a second arc-suppression component is set between the second input terminal and the output terminal of the heating relay switch. The first and second arc-suppression components absorb the instantaneous pulse electric sparks that occur in the heating relay switch to ensure the safety and stability of the circuit. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the drive voltage control circuit provided in the first embodiment of the present invention;

[0041] Figure 2 yes Figure 1 A schematic diagram of the intermediate heating sub-circuit module;

[0042] Figure 3 yes Figure 1 A schematic diagram of the main control circuit module;

[0043] Figure 4 This is a circuit diagram of the heating sub-circuit in the driving voltage control circuit provided in the second embodiment of the present invention;

[0044] Figure 5 yes Figure 4 Circuit diagram of the heating relay;

[0045] Figure 6 This is a circuit diagram of the main control sub-circuit in the driving voltage control circuit provided in the second embodiment of the present invention;

[0046] Figure 7 yes Figure 4 Circuit diagram of the main control relay;

[0047] Figure 8 This is a schematic diagram of the electric drive device provided in the third embodiment of the present invention;

[0048] Figure 9 yes Figure 8 A circuit diagram of the power supply and distribution circuit. Detailed Implementation

[0049] The present application will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the application and are not intended to limit the scope of the application.

[0050] In the following description, numerous specific details are set forth for illustrative purposes in order to provide a thorough understanding of the inventive concept. As part of this specification, some of the accompanying drawings of this disclosure are block diagrams illustrating structures and devices to avoid complicating the disclosed principles. For clarity, not all features of the actual embodiment need to be described. References to “an embodiment” or “an embodiment” in this disclosure mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment, and multiple references to “an embodiment” or “an embodiment” should not be construed as necessarily referring to the same embodiment.

[0051] Unless explicitly defined, the terms “a,” “an,” and “the” are not intended to refer to a singular entity, but rather to include a general category whose specific examples can be used for illustration. Therefore, the use of the terms “a” or “an” can mean any number of at least one, including “a,” “one or more,” “at least one,” and “one or more.” The term “or” means any of the options and any combination of the options, including all options unless explicitly indicated that the options are mutually exclusive. The phrase “at least one of” when combined with a list of items refers to a single item in the list or any combination of items in the list. The phrase does not require all items listed unless explicitly defined as such.

[0052] First implementation method:

[0053] A first embodiment of the present invention provides a drive voltage control circuit 100 for controlling the drive voltage transmitted to the electric actuator 300. For example... Figure 1 As shown, the drive voltage control circuit 100 includes a main control sub-circuit 20 and a heating sub-circuit 10. The main control sub-circuit 20 is used to control the on / off state of the drive voltage to control the start and stop of the electric actuator 300. The heating sub-circuit 10 is used to heat the electric actuator 300 before it is driven to work when the temperature of the electric actuator 300 is lower than a preset low temperature heating start threshold.

[0054] The heating sub-circuit 10 includes a heating actuator 102 and a heating control unit 101 electrically connected to the heating actuator 102. The heating control unit 101 includes a heating relay 1021 and a heating temperature control component 1011. The heating temperature control component 1011 is used to control the on / off state of the heating relay 1021 according to the temperature of the electric actuator 300. The heating relay 1021 includes a heating relay switch and a heating relay coil, and is used to transmit heating voltage to the heating actuator 102 according to the control of the heating temperature control component 1011.

[0055] like Figure 1 and Figure 3 As shown, the main control sub-circuit 20 includes a main control relay 202 and a main control temperature control component 201. The main control temperature control component 201 is used to control the on / off state of the main control relay 202 according to the temperature of the electric actuator 300. The main control relay 202 includes a main control relay switch module and a main control relay coil, and is used to transmit the driving voltage to the electric actuator 300 according to the control of the main control temperature control component 201.

[0056] The heating temperature control component 1011 and the main control temperature control component 201 work together according to the temperature of the electric actuator 300, so that the main control sub-circuit 20 transmits the driving voltage to the electric actuator 300 only when the temperature of the electric actuator 300 is higher than the preset threshold.

[0057] In actual operation, the heating sub-circuit 10 transmits heating voltage to the heating actuator 102 through the heating relay 1021 based on the temperature of the electric actuator 300 sensed by the heating temperature control component 1011, thereby changing the temperature of the entire electric actuator 300; subsequently, the main control sub-circuit 20 outputs drive voltage to the electric actuator 300 through the main control relay 202 based on the temperature of the electric actuator 300 sensed by the main control temperature control component 201, thereby controlling the normal operation of the electric actuator 300.

[0058] The heating temperature control component 1011 in the heating sub-circuit 10 controls the circuit where the heating relay coil is located to conduct according to the temperature of the electric actuator 300, so that the heating relay coil generates a magnetic field and changes the on / off state of the heating relay switch. In this way, the heating actuator 102 of the heating sub-circuit 10 is controlled to work according to the temperature of the electric actuator 300, so as to ensure that the heating actuator 102 works to increase the temperature of the electric actuator 300 under ultra-low temperature conditions.

[0059] In other words, this solution enables the heating sub-circuit 10 to automatically heat up to change the temperature of the electric actuator 300, and to control the operation of the electric actuator 300 based on the temperature, thereby ensuring that the SMT electronic components in the electric actuator 300 operate in a suitable temperature environment and avoiding the situation where the SMT electronic components are damaged by forced operation due to excessively high or low temperatures.

[0060] In some examples, such as Figure 2As shown, the heating relay 1021 includes a heating relay switch 1021a and a heating relay coil 1021b. The heating relay switch 1021a has a first input terminal, a second input terminal, and an output terminal. The heating temperature control assembly 1011 includes a first temperature control switch 10111 and a second temperature control switch 10112. The first input terminal of the heating relay switch 1021a is electrically connected to a first voltage source 501, and the output terminal of the heating relay switch 1021a is electrically connected to the heating actuator 102. One end of the heating relay coil 1021b is electrically connected to one end of the first temperature control switch 10111, and the other end of the heating relay coil 1021b is electrically connected to a second voltage source 502. The other end of the first temperature control switch 10111 is grounded (GND). One end of the second temperature control switch 10112 is electrically connected to the second input terminal of the heating relay switch 1021a, and the other end of the second temperature control switch 10112 is connected to a third voltage source 503.

[0061] In this example, the first temperature control switch 10111 controls the switching on and off of the circuit "second voltage source 502 - heating relay coil 1021b - first temperature control switch 10111 - ground GND" where the heating relay coil 1021b is located. After the heating relay coil 1021b conducts electricity, it generates a magnetic field, which controls the heating relay switch 1021a to change its working state from the first working state to the second working state through electromagnetic attraction.

[0062] The heating relay switch 1021a has two operating states that can be switched:

[0063] (1) In the first working state, the first input terminal and the output terminal of the heating relay switch are electrically connected. The circuit "first voltage source 501-heating relay switch 1021a-heating actuator 102" is turned on, and the first voltage source 501 supplies power to the heating actuator 102. The heating actuator works according to the driving voltage corresponding to the first voltage source 501 to increase the temperature of the electric actuator 300.

[0064] (2) In the second working state, the second input terminal and the output terminal of the heating relay switch are electrically connected, and the heating actuator 102 is powered by the third voltage source 503, which supplies power to the heating actuator 102. At the same time, the second temperature control switch 10112 is also set in the circuit that uses the third voltage source 503 to power the heating element 102 to control the on and off of the circuit, thereby realizing the temperature control of the electric actuator 300 and avoiding the temperature from being too high and exceeding the tolerance of the SMT electronic components in the electric actuator 300, thus affecting the normal operation of the electric actuator 300.

[0065] In this example, the first temperature control switch 10111 controls the energization of the heating relay coil 1021b, changes the working state of the heating relay 1021 switch, and thus realizes the switching between using the first voltage source 501 or the third voltage source 503 to heat the heating actuator 102.

[0066] Furthermore, the first temperature control switch 1011 is open when the temperature of the electric actuator 300 is lower than the high-temperature heating start threshold T1, and closed when the temperature of the electric actuator 300 is not lower than the high-temperature heating start threshold T1. The second temperature control switch 10112 is open when the temperature of the electric actuator 300 is lower than the low-temperature heating start threshold T2, and closed when the temperature of the electric actuator 300 is not lower than the low-temperature heating start threshold T2. The high-temperature heating start threshold T1 is less than the low-temperature heating start threshold T2, and the voltage provided by the first voltage source 501 is higher than that of the third voltage source 503.

[0067] Specifically, when the temperature T of the electric actuator 300 is less than the high-temperature heating start threshold T1, the first temperature control switch 10111 is turned off and the second temperature control switch 10112 is also turned off. At this time, the circuit where the heating relay coil 1021b is located is not connected, and the first end of the heating relay switch 1021a is electrically connected to the output end. The first voltage source 501 supplies power to the heating actuator 102 to realize the rapid heating function.

[0068] When the high-temperature heating start threshold T1 is less than or equal to the temperature T of the electric actuator 300 and less than the low-temperature heating start threshold T2, the first temperature control switch 10111 and the second temperature control switch 10112 are closed. At this time, the circuit where the heating relay coil 1021b is located is turned on, the second terminal of the heating relay switch 1021a is electrically connected to the output terminal, the circuit from the first voltage source 501 to the heating actuator 102 is disconnected, and the circuit from the third voltage source 503 to the heating actuator 102 is turned on. The third voltage source 503 is used to power the heating actuator 102 to achieve low-speed energy-saving heating.

[0069] When the temperature T of the electric actuator 300 is greater than or equal to the low-temperature heating start-up threshold T2, the first temperature control switch 10111 closes and the second temperature control switch 10112 opens. At this time, the circuit where the heating relay coil 1021b is located is turned on, the second terminal of the heating relay switch 1021a is electrically connected to the output terminal, the circuit from the first voltage source 501 to the heating actuator 102 is disconnected, and the circuit from the third voltage source 503 to the heating actuator 102 is also disconnected because the second temperature control switch 10112 is open. The heating actuator 102 no longer works, interrupting the heating of the electric actuator 300, avoiding the temperature of the electric actuator 300 from becoming too high and exceeding the temperature tolerance range of the STM circuit components, and ensuring the working life of the STM circuit components in the entire electric actuator 300.

[0070] Furthermore, the high-temperature heating start-up threshold T1 is -30℃, the low-temperature heating start-up threshold is 50℃, the first voltage source outputs 380V AC, the second voltage source outputs 24V DC, and the third voltage source outputs 220V AC.

[0071] Specifically, the first temperature control switch 10111 is open when the temperature is below -30℃ and closed when the temperature is equal to or above -30℃; the second temperature control switch 10112 is closed when the temperature is below 50℃ and open when the temperature is equal to or above 50℃. The first voltage source outputs 380V AC, the second voltage source outputs 24V DC, and the third voltage source outputs 220V AC.

[0072] When the temperature is above or equal to 50℃, both the first temperature control switch 10111 and the second temperature control switch 10112 are open, indicating that the current temperature is too high for heating. Both the first voltage source (AC380V) and the third voltage source (AC220V) interrupt power supply to the heating actuator. When the temperature is above or equal to -30℃ and below 50℃, the first and second temperature control switches are closed. The circuit containing the heating relay coil 1021b is activated, connecting the second input terminal and the output terminal of the heating relay switch 1021a. Power is supplied to the heating actuator 102 from the second voltage source (DC24V) for low-temperature heating. When the temperature is below -30℃, the first temperature control switch is open, the heating relay coil 1021b is not energized, and the first terminal and the output terminal of the heating relay switch 1021a are electrically connected. Power is supplied to the heating actuator 102 from the first voltage source (AC380V) for high-temperature heating.

[0073] In some examples, such as Figure 3As shown, the main control relay includes a main control relay switch module and a main control relay coil 2021. The main control relay switch module includes a main control relay switch 2022a and a main control relay auxiliary switch 2022b. The main control relay coil 2021 has an input terminal, a first output terminal, and a second output terminal. The main control temperature control component 201 includes a third temperature control switch 2013 and a fourth temperature control switch 2014. The first output terminal of the main control relay coil 2021 is electrically connected to one end of the main control relay auxiliary switch 2022b, and the second output terminal of the main control relay coil 2021 is... The output terminal is electrically connected to one end of the third temperature control switch 2013. The input terminal of the main control relay coil 2021 is electrically connected to the second voltage source 502. The other end of the main control relay auxiliary switch 2022b is electrically connected to one end of the fourth temperature control switch 2014. The other ends of the third temperature control switch 2013 and the other ends of the fourth temperature control switch 2014 are both grounded to GND. One end of the main control relay main switch 2022a is electrically connected to the fourth voltage source 504. The other end of the main control relay main switch 2022a is electrically connected to the electric actuator 300.

[0074] In this technical solution, a third temperature control switch 2013 and a fourth temperature control switch 2014 are used simultaneously to control the on / off state of the circuit containing the coil of the main control relay 2021, thereby changing the opening and closing of the main switch 2022a of the main control relay and realizing the control of the power supply from the fourth voltage source 504 to the electric actuator 300. Furthermore, the third temperature control switch 2013 and the fourth temperature control switch 2014 in this solution can form an interlock within a certain temperature range to ensure stable operation within a certain temperature range.

[0075] In a further example, the third temperature control switch 2013 is open when the temperature of the electric actuator 300 is lower than the self-locking start threshold T3, and closed when the temperature of the electric actuator 300 is not lower than the self-locking start threshold T3; the fourth temperature control switch 2014 is open when the temperature of the electric actuator 300 is lower than the self-locking minimum threshold T4, and closed when the temperature of the electric actuator 300 is not lower than the self-locking minimum threshold T4; wherein the self-locking start threshold T3 is greater than the self-locking minimum threshold T4.

[0076] In specific implementation, when the temperature T of the electric actuator 300 is less than the minimum self-locking threshold T4, the third temperature control switch 2013 and the fourth temperature control switch 2014 are disconnected, the auxiliary switch 2022 of the main control relay in the main control relay switch module is disconnected, the circuit where the main control relay coil 2021 is located is disconnected, and the main switch 2022a of the main control relay in the relay switch module is also disconnected accordingly. At this time, the fourth voltage source 504 cannot supply the driving voltage to the electric actuator 300, thus realizing the self-protection of the electric actuator 300 at low temperature.

[0077] When the temperature T of the electric actuator 300 is greater than or equal to the self-locking start threshold, the third temperature control switch 2013 and the fourth temperature control switch 2014 are closed. The circuit "second voltage source 502 - main control relay coil 2021 - third temperature control switch 2013 - ground GND" is turned on. After the main control relay coil 2021 conducts electricity, it generates a magnetic field, causing the main control relay main switch 2022a and the main control relay auxiliary switch 2022b to switch from the open state to the closed state. This turns on the circuit "fourth voltage source 504 - main control relay main switch 2022a - electric actuator 300". The fourth voltage source 504 supplies power to the electric actuator 300 for normal operation. It also turns on the circuit "second voltage source 502 - heating relay coil 2021 - fourth temperature control switch 2022b - ground GND", thus further ensuring that the main control relay coil 2021 is locked in the energized state.

[0078] When the minimum self-locking threshold T4 ≤ temperature T of the electric actuator 300 < self-locking start threshold T3, the third temperature control switch 2013 is open and the fourth temperature control switch 2014 is closed. At this time, if the temperature of the electric actuator 300 is rising, the opening of the third temperature control switch 2013 disconnects the circuit "second voltage source 502 - third temperature control switch 2013 - ground GND". The circuit "second voltage source 502 - main control circuit auxiliary switch 2022b - fourth temperature control switch 2014 - ground GND" remains open even when the fourth temperature control switch 2014 is closed. The circuit where the main control relay coil 2021 is located is not conductive, so the main control relay main switch 2022a and the main control relay auxiliary switch 2022b remain open, and the fourth voltage source 504 cannot supply power to the electric actuator 300. If the temperature of the electric actuator 300 is decreasing, the third temperature control switch 2013 opens, breaking the circuit of "second voltage source 502 - third temperature control switch 2013 - ground GND". In the previous period, the main control relay auxiliary switch 2022b was closed. At this time, the fourth temperature control switch 2014 also closes, making the circuit of "second voltage source 502 - main control circuit auxiliary switch 2022b - fourth temperature control switch 2014 - ground GND" conduct. The circuit where the main control relay coil 2021 is located is conducting. The main control relay coil 2021 generates a magnetic field, causing the main control relay main switch 2022a to close. The fourth voltage source 504 continues to supply power to the electric actuator 300, and at the same time, it will also cause the main control relay auxiliary switch 2022b to close, restoring and ensuring that the circuit where the main control relay coil 2021 is located, which is powered by the second voltage source 502, remains conducting.

[0079] Therefore, in this example, as the temperature rises to a suitable temperature, the fourth voltage source 504 supplies power to the electric actuator 300 to ensure its normal operation. After the initial heating and even if there are small temperature fluctuations, the main circuit auxiliary switch 2022b will remain closed to ensure that the electric actuator 300 operates normally under the driving voltage when the temperature drops slightly. This achieves a certain degree of state interlocking (temperature fluctuations occur after the initial heating exceeds the self-locking start threshold T3, and the temperature is between the self-locking minimum threshold T4 and the self-locking start threshold T3), protecting other working components and preventing the temperature control switch from frequently switching at the critical point, thus reducing the service life of electronic components.

[0080] In a further example, the self-locking start threshold is -30℃, the self-locking minimum threshold is -45℃, and the second voltage source 502 outputs DC 24V.

[0081] In some examples, the heating subcircuit further includes a heating arc suppression component, which includes a first arc suppression component and a second arc suppression component. One end of the first arc suppression component is electrically connected to the first input terminal of the heating relay switch 1021a, and the other end of the first arc suppression component is electrically connected to the output terminal of the heating relay switch 1021a. One end of the second arc suppression component is electrically connected to the second input terminal of the heating relay switch 1021a, and the other end of the second arc suppression component is electrically connected to the output terminal of the heating relay switch 1021a. The first arc suppression component includes a first arc suppression capacitor and a second arc suppression capacitor connected in series, and the second arc suppression component includes a third arc suppression capacitor and a fourth arc suppression capacitor connected in series.

[0082] The first arc suppression component is disposed between the first input terminal and the output terminal of the heating relay switch 1021a, so that the first arc suppression component can absorb the pulse voltage between the first input terminal and the output terminal to eliminate electric sparks. The second arc suppression component is disposed between the second input terminal and the output terminal of the heating relay switch 1021a, so that the second arc suppression component absorbs the pulse voltage between the second input terminal and the output terminal to eliminate electric sparks and improve the safety of the overall circuit.

[0083] In some examples, the main control sub-circuit is equipped with a main control arc suppression component. One end of the main control arc suppression component is electrically connected to one end of the main control relay main switch 2022a, and the other end of the main control arc suppression component is electrically connected to the other end of the main control relay main switch 2022a. The main control arc suppression component includes a fifth arc suppression capacitor and a sixth arc suppression capacitor connected in series.

[0084] The main control arc suppression component absorbs the pulse current generated by the main control relay main switch 2022a at the moment of switching, eliminating electric sparks and improving the safety of the overall circuit.

[0085] Second implementation method:

[0086] A second embodiment of the present invention provides a drive voltage control circuit, such as... Figure 4 , Figure 5 and Figure 6 As shown, this embodiment is a specific example of the module diagram of the first embodiment. The specific details of the first embodiment are still valid in this embodiment and will not be repeated here.

[0087] like Figure 4 As shown, the heating sub-circuit includes a heating actuator and a heating control unit. The heating control unit includes a heating relay and a heating temperature control component. The heating relay includes a heating relay switch and a heating relay coil. The heating relay switch is actually a linkage switch k2, which has an upper switch and a lower switch. The upper and lower switches open and close synchronously, as shown in the following connection:

[0088] The first input terminal on the left side of the upper switch is electrically connected to the live wire of the first voltage source (AC380V), and the second input terminal on the left side of the upper switch is electrically connected to the live wire of the third voltage source (AC220V). The output terminal on the right side of the upper switch is electrically connected to the live wire of the heating actuator. The first input terminal on the left side of the lower switch is electrically connected to the neutral wire of the first voltage source (AC380V), and the second input terminal on the left side of the lower switch is electrically connected to the neutral wire of the third voltage source (AC220V). The output terminal on the right side of the lower switch is electrically connected to the neutral wire of the heating actuator.

[0089] like Figure 5 As shown, the heating relay is RELAY1 in the figure, model HF11F / 024-2ZS4. Pins 1 and 2 of this heating relay are the two terminals of the heating relay coil. Pin 1 is connected to one end of the first temperature control switch P3, and the other end of the first temperature control switch P3 is grounded. Pin 2 is connected to the second voltage source DC24V. The circuit of the heating relay coil is formed by "second voltage source DC24V - heating relay pin 2 - heating relay pin 1 - first temperature control switch P3 - ground".

[0090] Pins 3, 5, and 7 of the heating relay constitute the upper switch. Pin 3 is electrically connected to the live wire of the first voltage source AC380V, pin 5 is the output terminal and is electrically connected to the live wire of the heating actuator, and pin 7 is electrically connected to one end of the second temperature control switch P2. The other end of the second temperature control switch P2 is electrically connected to the live wire of the third voltage source AC220V. Pins 4, 6, and 8 of the heating relay constitute the lower switch. Pin 4 is electrically connected to the neutral wire of AC380V, pin 6 is electrically connected to the neutral wire of the heating actuator, and pin 8 is electrically connected to the neutral wire of the third voltage source AC220V.

[0091] like Figure 4 and Figure 5 As shown, the heating actuator includes multiple sets of heating elements and fuses. Each set of heating elements is connected in series with a fuse and then electrically connected to the output terminal of the heating relay switch. Fuse F1 is connected in series with heating element JP2, fuse F2 is connected in series with heating element JP3, and fuse F3 is connected in series with heating element JP5. The left ends of fuses F1, F2, and F3 are connected in parallel and then electrically connected to the output terminal of the heating relay switch. The fuses are slow-blow 380V fuses, and the heating elements are typically heating plates.

[0092] like Figure 4 and Figure 5As shown, the heating arc suppression assembly includes a first arc suppression component and a second arc suppression component. The first arc suppression component includes a first arc suppression capacitor C3 and a second arc suppression capacitor C4 connected in series. The left end of the first arc suppression capacitor C3 is electrically connected to the 380V live wire, and the right end of the first arc suppression capacitor C3 is connected to the left end of the second arc suppression capacitor C4. The right end of the second arc suppression capacitor C4 is electrically connected to the output live wire of the heating relay switch. The second arc suppression component includes a third arc suppression capacitor C1 and a second arc suppression capacitor C2 connected in series. The left end of the third arc suppression capacitor C1 is electrically connected to the 380V neutral wire, and the right end of the third arc suppression capacitor C1 is connected to the left end of the fourth arc suppression capacitor C2. The right end of the fourth arc suppression capacitor C2 is electrically connected to the output neutral wire of the heating relay switch.

[0093] In some examples, such as Figure 6 As shown, the main control sub-circuit includes a main control relay and a main control temperature control component. The main control relay includes a main control coil and a main control switch component K1. The main control switch component includes an upper switch and a lower switch. The upper switch serves as the main switch for the main control relay, and the lower switch serves as the auxiliary switch for the main control relay. The upper and lower switches open and close synchronously.

[0094] The left end of the upper switch is used to electrically connect to the electric actuator, and the right end of the upper switch is used to electrically connect to the fourth voltage source JP6. The left end of the lower switch is used to electrically connect to the right end of the main control relay coil, and the right end of the lower switch is used to electrically connect to pin 2 of the fourth temperature control switch P4. Pin 1 of the fourth temperature control switch P4 is grounded. The left end of the main control relay coil is used to electrically connect to the second voltage source DC24V, and the right end of the main control relay coil is also used to electrically connect to pin 2 of the third temperature control switch P5. Pin 1 of the third temperature control switch P5 is grounded. The third temperature control switch P5 and the fourth temperature control switch P4 are connected in parallel and then grounded.

[0095] Specifically, such as Figure 7 As shown, the main control relay is RELAY2 in the figure, model HF115 / 024-2ZS4, and the relay coil is set between pin 1 and pin 2 of the main control relay.

[0096] Pins 7 and 5 of the main control relay are configured as the upper switch (i.e., the main switch of the main control relay). Pin 7 is electrically connected to the electric actuator, and pin 5 is electrically connected to the fourth voltage source AP4 to transmit the drive voltage.

[0097] Pins 6 and 8 of the main control relay are set as the lower switch (i.e., the auxiliary switch of the main control relay). Pin 1 on the left end of the relay coil is electrically connected to the third temperature control switch P5 and then grounded. At the same time, pin 1 is also electrically connected to pin 8. Pin 6 is electrically connected to the fourth temperature control switch P4 and then grounded. Pin 2 on the right end of the relay coil is electrically connected to the second voltage source DC24V.

[0098] Furthermore, such as Figure 6As shown, the main control sub-circuit is equipped with a main control arc suppression component. The main control arc suppression component includes a fifth arc suppression capacitor C5 and a sixth arc suppression capacitor C6 connected in series. The left end of the fifth arc suppression capacitor C5 is electrically connected to the left end of the main control relay coil, the right end of the fifth arc suppression capacitor C5 is electrically connected to the left end of the sixth arc suppression capacitor C6, and the right end of the sixth arc suppression capacitor C6 is electrically connected to the right end of the main control relay coil.

[0099] Detailed, such as Figure 7 As shown, the left end of the fifth arc-suppression capacitor C5 is electrically connected to pin 7 of the main control relay, the right end of the fifth arc-suppression capacitor C5 is electrically connected to the left end of the sixth arc-suppression capacitor C6, and the right end of the sixth arc-suppression capacitor C6 is electrically connected to pin 5 of the main control relay.

[0100] It is worth mentioning that the first, second, third, and fourth temperature control switches can all use KSD9700 temperature control switches. The high-temperature heating start threshold, low-temperature heating start threshold, self-locking start threshold, and self-locking minimum threshold are input as fixed temperatures to the first, second, third, and fourth temperature control switches respectively. During use, the ambient temperature is detected to trigger the switching of these temperature control switches. The first capacitor C3, second capacitor C4, third capacitor C1, fourth capacitor C2, fifth capacitor C5, and sixth capacitor C6 are all safety-grade capacitors to avoid electrical sparks caused by the pulse current during high-voltage switching of the relay switches. The spacing between the first capacitor C3 and the second capacitor C4 should meet the circuit board design standards; similarly, the spacing between the third capacitor C1 and the fourth capacitor C2, and the spacing between the fifth capacitor C5 and the sixth capacitor C6 should meet the circuit board design standards.

[0101] Third implementation method:

[0102] The third embodiment of the present invention provides an electric drive device 400, such as... Figure 8As shown, the electric drive device 400 includes an electric actuator 300, a power supply circuit 500, and a drive voltage control circuit 100 as described above. The electric actuator 300 is electrically connected to the main control sub-circuit 20 in the drive voltage control circuit 100 to receive the drive voltage transmitted by the main control sub-circuit 20. The power supply circuit 500 includes a first transformer 511, a second transformer 512, and a rectifier 513. One end of the first transformer 511 is electrically connected to a total voltage source 510. The other end of the first transformer 511 is provided with a first output node and a second output node. The first output node outputs a first voltage source 501, and the second output node outputs a fourth voltage source 504. One end of the second transformer 512 is connected to the first voltage source 501. The other end of the second transformer is provided with a third output node and a fourth output node. The third output node outputs a third voltage source 503, and the fourth output node is electrically connected to the input terminal of the rectifier 513. The output terminal of the rectifier 513 outputs a second voltage source 502. Among them, the first voltage source 501, the second voltage source 502, and the third voltage source 503 all supply power to the drive voltage control circuit 100, and the fourth voltage source 504 supplies power to the electric actuator 300 under the control of the drive voltage control circuit 100.

[0103] Specifically, such as Figure 9 As shown, the main voltage source is input from the right side of the first transformer T2. The left side of the first transformer has a first output node and a second output node. The first output node outputs AC380V to the first voltage source AP1, and the second output node outputs the fourth voltage source AP4. The first voltage source AP1 is input from the left side of the second transformer T1. The right side of the second transformer T1 has a third output node and a fourth output node. The third output node outputs AC220V as the third voltage source AP3, and the fourth output node outputs AC20V. This AC20V is input to the AC interface of rectifier D1. Pin 3 of rectifier D1 is grounded, and the V+ output of rectifier D1 is DC24V as the second voltage source AP2. A protective capacitor E1 is also installed between the ground wire and the V+ pin of rectifier D1. The minimum operating temperature of this protective capacitor E1 is -60℃.

[0104] In practical implementation, the heating sub-circuit 10 and the power supply circuit 500 are mounted on the same circuit board, referred to as the heating board; the main control sub-circuit is mounted on another circuit board, referred to as the control board; a thermally conductive silicone layer and a silicone rubber heating layer are placed between the control board and the heating board. The silicone rubber heating layer is laid on the heating circuit board, the thermally conductive silicone layer is laid on the silicone heating layer, and the control board is laid on the silicone heating layer. This ensures that the heating sub-circuit 10 provides uniform heating for the power supply circuit.

[0105] The electric drive device 400 has a cavity containing the aforementioned interconnected heating plate and control plate. Electronic components in the electric actuator connected to the control plate that have temperature limitations or cannot withstand extremely low temperatures can also be placed closer to the heating plate. For example, a potentiometer in the electric actuator, whose specifications state it is unsuitable for low-temperature operation, is placed near the heating plate in practical applications. Another example is an AC contactor in the electric actuator, which controls the forward and reverse rotation of the three-phase motor of the actuator and is not suitable for operation at -40°C; therefore, it is also placed near the heating plate to ensure normal operation.

[0106] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A drive voltage control circuit for controlling a drive voltage to an electric actuator, characterized by The driving voltage control circuit comprises a master sub-circuit and a heating sub-circuit, the master sub-circuit is used for controlling the on-off of the driving voltage to control the start-stop of the electric actuator, and the heating sub-circuit is used for heating the electric actuator before driving the electric actuator to work when the temperature of the electric actuator is lower than a preset low-temperature heating start threshold. The heating sub-circuit comprises a heating execution element and a heating control unit electrically connected with the heating execution element, the heating control unit comprises a heating relay and a heating temperature control assembly, the heating temperature control assembly is used for controlling the on-off of the heating relay according to the temperature of the electric actuator, and the heating relay comprises a heating relay switch and a heating relay coil, which are used for delivering a heating voltage to the heating execution element according to the control of the heating temperature control assembly. The master sub-circuit comprises a master control relay and a master temperature control assembly, the master temperature control assembly is used for controlling the on-off of the master control relay according to the temperature of the electric actuator, and the master control relay comprises a master control relay switch module and a master control relay coil, which are used for delivering the driving voltage to the electric actuator according to the control of the master temperature control assembly. The heating temperature control assembly and the master temperature control assembly work cooperatively according to the temperature of the electric actuator, so that the master sub-circuit delivers the driving voltage to the electric actuator only when the temperature of the electric actuator is higher than a preset threshold.

2. The drive voltage control circuit according to claim 1, characterized by The heating relay switch has a first input end, a second input end and an output end, the heating temperature control assembly comprises a first temperature control switch and a second temperature control switch, the first input end of the heating relay switch is electrically connected with a first voltage source, the output end of the heating relay switch is electrically connected with the heating execution element, one end of the heating relay coil is electrically connected with one end of the first temperature control switch, the other end of the heating relay coil is electrically connected with a second voltage source, the other end of the first temperature control switch is grounded, one end of the second temperature control switch is electrically connected with the second input end of the heating relay switch, and the other end of the second temperature control switch is electrically connected with a third voltage source.

3. The drive voltage control circuit according to claim 2, characterized by The first temperature control switch is opened when the temperature of the electric actuator is lower than a high-temperature heating start threshold, and is closed when the temperature of the electric actuator is not lower than the high-temperature heating start threshold, the second temperature control switch is opened when the temperature of the electric actuator is lower than a low-temperature heating start threshold, and is closed when the temperature of the electric actuator is not lower than the threshold, the high-temperature heating start threshold is lower than the low-temperature heating start threshold, and the voltage provided by the first voltage source is higher than the third voltage source.

4. The drive voltage control circuit according to claim 3, characterized by The low-temperature heating start threshold is 50℃, the high-temperature heating start threshold is -30℃, the first voltage source outputs 380V alternating current, the second voltage source outputs 24V direct current, and the third voltage source outputs 220V alternating current.

5. The drive voltage control circuit according to claim 2, wherein The master relay switch module includes a master relay main switch and a master relay auxiliary switch, the master relay coil has an input end, a first output end and a second output end, the master temperature control assembly includes a third temperature control switch and a fourth temperature control switch, the first output end of the master relay coil is electrically connected with one end of the master relay auxiliary switch, the second output end of the master relay coil is electrically connected with one end of the third temperature control switch, the input end of the master relay coil is electrically connected with the second voltage source, the other end of the master relay auxiliary switch is electrically connected with one end of the fourth temperature control switch, the other end of the third temperature control switch and the other end of the fourth temperature control switch are both grounded, one end of the master relay main switch is electrically connected with a fourth voltage source, and the other end of the master relay main switch is electrically connected with the electric actuator.

6. The drive voltage control circuit according to claim 5, wherein The third temperature control switch is opened when the temperature of the electric actuator is lower than a self-locking starting threshold, and is closed when the temperature of the electric actuator is not lower than the self-locking starting threshold, the fourth temperature control switch is opened when the temperature of the electric actuator is lower than a self-locking minimum threshold, and is turned on when the temperature of the electric actuator is not lower than the self-locking minimum threshold, and the self-locking starting threshold is greater than the self-locking minimum threshold.

7. The drive voltage control circuit according to claim 6, characterized by The self-locking starting threshold is -30°C, the self-locking minimum threshold is -45°C, and the second voltage source outputs 24V direct current.

8. The drive voltage control circuit according to claim 2, wherein The heating sub-circuit further includes a heating arc elimination assembly, the heating arc elimination assembly includes a first arc elimination assembly and a second arc elimination assembly, one end of the first arc elimination assembly is electrically connected with the first input end of the heating relay switch, the other end of the first arc elimination assembly is electrically connected with the output end of the heating relay switch, one end of the second arc elimination assembly is electrically connected with the second input end of the heating relay switch, and the other end of the second arc elimination assembly is electrically connected with the output end of the heating relay switch, the first arc elimination assembly includes a first arc elimination capacitor and a second arc elimination capacitor connected in series with each other, and the second arc elimination assembly includes a third arc elimination capacitor and a fourth arc elimination capacitor connected in series with each other.

9. The drive voltage control circuit according to claim 5, wherein The master sub-circuit further includes a master arc elimination assembly, one end of the master arc elimination assembly is electrically connected with one end of the master relay main switch, and the other end of the master arc elimination assembly is electrically connected with the other end of the master relay main switch, and the master arc elimination assembly includes a fifth arc elimination capacitor and a sixth arc elimination capacitor connected in series with each other.

10. An electrically driven device, characterized by The electric drive device includes an electric actuator, a power supply and distribution circuit, and a drive voltage control circuit as claimed in any one of claims 1-9, the electric actuator is electrically connected with the master sub-circuit to receive the drive voltage transmitted by the master sub-circuit; The power supply circuit comprises a first transformer, a second transformer and a rectifier, a primary coil of the first transformer is electrically connected with an external voltage source, a secondary coil of the first transformer is provided with a first output node and a second output node, the first output node is used as a first voltage source, the second output node is used as a fourth voltage source, a primary coil of the second transformer is electrically connected with the first voltage source, a secondary coil of the second transformer is provided with a third output node and a fourth output node, the third output node is used as a third voltage source, the fourth output node is electrically connected with an input end of the rectifier, and an output end of the rectifier is used as a second voltage source.

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