Multi-rated voltage control circuit and control device for switch operating coil

Abstract

The present invention discloses a multi-rated voltage control circuit and a control device for a switch operating coil, wherein the multi-rated voltage control circuit for the switch operating coil comprises: a rectifying and filtering unit, used for rectifying and filtering an input voltage to output a DC voltage; a main control unit, used for adaptively detecting the input voltage to determine the voltage state of the input voltage and outputting a corresponding control signal; a DC-DC step-down unit, used for stepping down the DC voltage; a switch switching unit, used for controlling the DC voltage to directly supply power to the switch operating coil or the DC voltage to supply power to the switch operating coil after being stepped down by the DC-DC step-down unit, thereby broadening the rated voltage range of the switch operating coil, making one rated voltage coil suitable for multiple other rated voltages, thereby reducing the inventory and operation and maintenance costs of the switch.

Description

Technical Field

[0001] The present invention relates to the technical field of switch operating coil applications, and in particular to a multi-rated voltage control circuit for a switch operating coil and a control device having the multi-rated voltage control circuit. Background Art

[0002] In the related art, the same switch operating coil, such as a contactor coil, generally has only one rated voltage. Assuming that the rated control voltage of a contactor is AC24V, its maximum voltage range for normal operation is AC18V-AC30V; however, in actual applications, different contactor coils have different rated voltage specifications. Due to the voltage diversity of the contactor coil, inventory waste increases, maintenance and replacement are inconvenient, and the power consumption of the contactor coil itself is greatly wasted. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, one object of the present invention is to provide a multi-rated voltage control circuit for a switch operating coil, which selects different circuits according to different input voltages to output voltages that can meet the working conditions of switch operating coils with multiple different rated voltages, so that one rated voltage coil is suitable for multiple other rated voltages, thereby reducing switch inventory and operation and maintenance costs.

[0004] Another object of the present invention is to provide a control device.

[0005] To achieve the above-mentioned purpose, the present invention proposes a multi-rated voltage control circuit for a switch operation coil on one hand, comprising: a rectifier and filter unit, which performs rectifier and filter processing on an input voltage to output a DC voltage; a main control unit, wherein an input end of the main control unit is connected to an input end of the rectifier and filter unit, and the main control unit adaptively determines a voltage state of the input voltage by detecting the input voltage, and outputs a corresponding control signal; a DC-DC step-down unit, wherein an input end of the DC-DC step-down unit is connected to an output end of the rectifier and filter unit to step down the DC voltage; a switch switching unit, wherein an input end of the switch switching unit is respectively connected to an output end of the rectifier and filter unit and an output end of the DC-DC step-down unit, and an output end of the switch switching unit is connected to a first end of the switch operation coil, so as to control the DC voltage to directly power the switch operation coil or to power the switch operation coil after the DC voltage is stepped down by the DC-DC step-down unit.

[0006] According to the multi-rated voltage control circuit of the switch operating coil proposed in the present invention, the input voltage is rectified and filtered by the rectification and filtering unit to output a DC voltage, the main control unit determines the voltage state of the input voltage by detecting the input voltage and outputs a corresponding control signal, the DC-DC step-down unit steps down the DC voltage, and the switch switching unit controls the DC voltage to directly power the switch operating coil or the DC voltage is stepped down by the DC-DC step-down unit before powering the switch operating coil; thus, different circuits are selected according to different input voltages to output a voltage that can meet the working requirements of the switch operating coil, thereby broadening the rated voltage range of the switch operating coil, so that one rated voltage coil can replace multiple other rated voltage coils, thereby reducing inventory and operation and maintenance costs.

[0007] In addition, the multi-rated voltage control circuit of the switch operating coil proposed in the present invention may also have the following additional technical features:

[0008] Optionally, the switch switching unit controls the DC voltage to directly supply power to the switch operation coil according to a corresponding control signal output by the main control unit, or the DC voltage is stepped down by the DC-DC step-down unit before supplying power to the switch operation coil.

[0009] Optionally, the main control unit detects the size of the input voltage, and when the input voltage is less than a preset first threshold, controls the DC voltage to directly power the switch operation coil; when the input voltage is greater than or equal to the preset first threshold, controls the DC voltage to be stepped down by the DC-DC step-down unit before powering the switch operation coil.

[0010] Optionally, the multi-rated voltage control circuit of the switch operating coil also includes: a multi-channel detection unit, the input end of the multi-channel detection unit is connected to the voltage input end, the output end of the multi-channel detection unit is connected to the input end of the main control unit, the multi-channel detection unit performs branching processing on the input voltage to output the voltage value corresponding to each channel, and the main control unit adaptively screens the received voltage value of each channel to determine the selected voltage value as the final input voltage.

[0011] Optionally, the main control unit predefines the input voltage range corresponding to each channel, so that when the voltage value of each channel is received, it is determined whether it is within the corresponding input voltage range according to the received voltage value of each channel. If so, the corresponding voltage value within the input voltage range is determined as the final input voltage.

[0012] Optionally, the switch switching unit controls the DC voltage to directly supply power to the switch operation coil according to the manual switching signal, or the DC voltage is stepped down by the DC-DC step-down unit before supplying power to the switch operation coil.

[0013] Optionally, the multi-rated voltage control circuit of the switch operating coil also includes: a power supply unit, the input end of the power supply unit is connected to the output end of the rectifier and filter unit, and the power supply unit is used to step down the DC voltage so as to provide a stable driving voltage for the main control unit and the switch switching unit.

[0014] Optionally, the multi-rated voltage control circuit of the switch operating coil also includes: a driving unit, wherein the input end of the driving unit is connected to the first output end of the main control unit, the output end of the driving unit is connected to the second end of the switch operating coil, and the driving unit controls the on and off state of the switch operating coil according to the control signal output by the main control unit.

[0015] Optionally, the main control unit detects the size of the input voltage and determines the corresponding rated voltage based on the size of the input voltage. When the input voltage is greater than a second threshold value of the corresponding rated voltage, or is less than or equal to a third threshold value of the corresponding rated voltage, the switch operating coil is controlled to be released; otherwise, the switch operating coil is controlled to be attracted; wherein, the main control unit also generates a reverse potential demagnetization when the switch operating coil is released to accelerate the release of the switch operating coil.

[0016] Optionally, the main control unit controls the on and off of the switch operation coil through a PWM control signal.

[0017] Optionally, the multi-rated voltage control circuit of the switch operating coil further includes: a display unit, the input end of the display unit is connected to the second output end of the main control unit, and the display unit is used to display the current power supply, voltage and working status of the coil.

[0018] In order to achieve the above object, the present invention further proposes a control device on the other hand, which includes the multi-rated voltage control circuit of the switch operating coil.

[0019] According to the control device proposed in the present invention, through the multi-rated voltage control circuit of the switch operating coil, different circuits are selected according to different input voltages to output voltages that can meet the working requirements of the switch operating coil, thereby broadening the rated voltage range of the switch operating coil, making one rated voltage coil suitable for multiple rated voltages, thereby reducing switch inventory and operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A block diagram of a multi-rated voltage control circuit for a switch operating coil according to an embodiment of the present invention;

[0021] Figure 2 A circuit schematic diagram of a multi-channel detection unit in a multi-rated voltage control circuit of a switch operating coil according to an embodiment of the present invention;

[0022] Figure 3 A block diagram of a power supply unit in a multi-rated voltage control circuit for a switch operating coil according to an embodiment of the present invention;

[0023] Figure 4 4 is a block diagram of a control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0026] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] The following describes a multi-rated voltage control circuit for a switch operating coil and a control device having the multi-rated voltage control circuit according to an embodiment of the present invention with reference to the accompanying drawings.

[0028] refer to Figure 1 As shown, the multi-rated voltage control circuit of the switch operation coil proposed in the embodiment of the present invention includes a rectification and filtering unit 10, a main control unit 20, a DC-DC buck unit 30 and a switch switching unit 40.

[0029] Among them, the rectifier and filter unit 10 performs rectification and filtering on the input voltage to output a DC voltage; the input end of the main control unit 20 is connected to the input end of the rectifier and filter unit 10, and the main control unit 20 adaptively determines the voltage state of the input voltage by detecting the input voltage, and outputs a corresponding control signal; the input end of the DC-DC buck unit 30 is connected to the output end of the rectifier and filter unit 10 to buck the DC voltage; the input end of the switch switching unit 40 is respectively connected to the output end of the rectifier and filter unit 10 and the output end of the DC-DC buck unit 30, and the output end of the switch switching unit 40 is connected to the first end of the switch operating coil, so as to control the DC voltage to directly power the switch operating coil or the DC voltage is bucked by the DC-DC buck unit 30 before powering the switch operating coil.

[0030] As an embodiment, the switch operating coil may be a contactor coil.

[0031] That is to say, the DC-DC step-down unit 30 switches the power supply circuit according to the input voltage, so that the input voltage is directly powered to the contactor coil after being processed by the rectification and filtering unit 10; or the input voltage is processed by the rectification and filtering unit 10, and then stepped down by the DC-DC step-down unit 30 before being powered to the contactor coil.

[0032] As an embodiment, the switch switching unit 40 controls the DC voltage to directly power the switch operation coil according to the corresponding control signal output by the main control unit 20, or the DC voltage is stepped down by the DC-DC step-down unit 30 before powering the switch operation coil.

[0033] That is to say, the main control unit 20 monitors the input voltage signal in real time to obtain the input voltage magnitude, and adaptively determines the state of the input voltage according to the input voltage magnitude, and outputs a corresponding control signal to control the switch switching unit 40 to perform corresponding circuit switching.

[0034] As a specific embodiment, the main control unit 20 detects the size of the input voltage. When the input voltage is less than a preset first threshold, the DC voltage is controlled to directly power the switch operation coil; when the input voltage is greater than or equal to the preset first threshold, the DC voltage is controlled to be stepped down by the DC-DC step-down unit 30 before powering the switch operation coil.

[0035] As an example, the preset first threshold may be 50V, which is not specifically limited in the present invention.

[0036] That is to say, when the input voltage obtained by the main control unit 20 is less than 50V, it is judged that the voltage state of the input voltage is low voltage, and the main control unit 20 outputs a control signal to the switch switching unit 40, so that the switch switching unit 40 switches to the low-voltage power supply circuit, so that the input voltage is processed by the rectification and filtering unit 10 and directly supplies power to the contactor coil; when the input voltage obtained by the main control unit 20 is greater than or equal to 50V, it is judged that the voltage state of the input voltage is high voltage, and the main control unit 20 outputs a control signal to the switch switching unit 40, so that the switch switching unit 40 switches to the high-voltage power supply circuit, so that the input voltage is processed by the rectification and filtering unit 10, and then the DC-DC step-down unit 30 is used for step-down processing before powering the contactor coil.

[0037] It should be noted that by connecting a low-voltage direct power supply circuit in parallel to the DC-DC step-down unit 30, a two-way power supply mode is realized, and the high voltage and low voltage are processed separately, so that when the input voltage is low, the contactor coil also has a sufficient operating voltage value, so it has a lower voltage control performance, and thus adapts to the operation control of contactors with a variety of different rated voltages.

[0038] As an embodiment, the multi-rated voltage control circuit of the above-mentioned switch operating coil also includes a multi-channel detection unit, the input end of the multi-channel detection unit is connected to the voltage input end, the output end of the multi-channel detection unit is connected to the input end of the main control unit 20, and the multi-channel detection unit branches the input voltage to output the voltage value corresponding to each channel. The main control unit 20 adaptively screens the received voltage value of each channel to determine the selected voltage value as the final input voltage.

[0039] It should be noted that the main control unit 20 predefines the input voltage range corresponding to each channel, so that when the voltage value of each channel is received, it is determined whether it is within the corresponding input voltage range based on the voltage value received for each channel. If so, the voltage value corresponding to the input voltage range is determined as the final input voltage.

[0040] As a specific example, Figure 2 As shown, the input voltage is divided into three paths through a multi-path detection unit, and each path is connected to the input end of the main control unit 20 through a corresponding comparator. Assuming that the total range of the input voltage is 0-300V, the input voltage range corresponding to each path is pre-defined in the main control unit 20. For example, the input voltage range corresponding to the first path is defined as 0-100V, the input voltage range corresponding to the second path is defined as 101-200V, and the input voltage range corresponding to the third path is defined as 201-300V.

[0041] Assuming that the actual input voltage is 120V at this time, the 120V input voltage is branched through the multi-channel detection unit, and the main control unit 20 obtains the corresponding voltage value of each channel respectively. Assuming that the voltage value received by the main control unit 20 through the first channel is 110V, the voltage value received through the second channel is 120V, and the voltage value received through the third channel is 115V. The main control unit 20 determines whether the voltage value is within the corresponding input voltage range based on each received voltage value. If so, the voltage value is determined as the final input voltage. Obviously, from the above, it can be seen that the voltage value received by the second channel is 120V within the input voltage range of 101-200V corresponding to the second channel, and the voltage values ​​received by other channels are not within the corresponding input voltage range, so 120V is determined as the final input voltage.

[0042] It should be noted that, assuming that the three voltage values ​​received by the main control unit 20 are in a critical state, for example, the first voltage value received is 190V, the second voltage value received is 199V, and the third voltage value received is 201V, then the second and third voltage values ​​received are both within the corresponding input voltage range, and the larger value of the second and third voltage values, that is, 201V, can be selected as the final input voltage; since the deviation of the voltage values ​​in this critical state is small, it does not matter which voltage value is selected as the final input voltage.

[0043] In addition, the present invention does not specifically limit the number of paths that the multi-path detection unit divides the input voltage into, and the number of paths can be set according to actual needs.

[0044] It should be noted that since the input voltage range that can be inputted by the present invention is relatively wide, the input voltage detection circuit also needs to have a wide detection range. However, the wider the range, the lower the accuracy. For this reason, the present invention implements a single-channel input voltage multi-channel output signal method through the above-mentioned multi-channel detection unit, and processes the input voltage in a wider range in segments, thereby greatly improving the detection accuracy and making the input voltage detected by the main control unit closer to the actual input voltage.

[0045] As an embodiment, the switch switching unit 40 controls the DC voltage to directly supply power to the switch operation coil according to the manual switching signal, or the DC voltage is stepped down by the DC-DC step-down unit 30 before supplying power to the switch operation coil.

[0046] That is, before the power is turned on, the user can select the corresponding power supply circuit by manually toggling the conversion switch of the switch switching unit 40 according to the rated voltage input.

[0047] It should be noted that, because the user knows the input voltage in advance, the user can manually switch the switch of the switch switching unit 40 before turning on the power supply to select the corresponding power supply circuit.

[0048] Therefore, through the above-mentioned multi-rated voltage control circuit, the rated voltage range of the switch operating coil can be increased from the existing AC18V-AC30V to AC16V-300V (or DC16V-425V), thereby realizing a low-rated voltage coil suitable for multiple rated voltages, reducing switch inventory and operation and maintenance costs.

[0049] As an example, Figure 3 As shown, the multi-rated voltage control circuit of the above-mentioned switch operating coil also includes a power supply unit, the input end of the power supply unit is connected to the output end of the rectifier and filter unit 10, and the power supply unit is used to step down the DC voltage so as to provide a stable driving voltage for the main control unit 20 and the switch switching unit 40.

[0050] As an example, Figure 3 As shown, the power supply unit adds some auxiliary and feedback circuits based on the buck step-down circuit, so that when the input voltage range is wide, it can stably output the driving voltage to power the main control unit 20 and the switch switching unit 40.

[0051] It should be noted that, affected by the internal resistance of the switching power supply MOS and the power-on output time, the input voltage support range of a general wide voltage circuit is only 85-265V; while the input voltage of the present invention supports a wide range of 16V-300V; at low voltage, in order to ensure the reliable operation of the drive switch operating coil, a high-power output capability is required.

[0052] Therefore, the multi-rated voltage control circuit of the switch-operated coil proposed by the present invention can maintain high power output when the input voltage is low.

[0053] As an example, Figure 1 As shown, the multi-rated voltage control circuit of the above-mentioned switch operating coil also includes a driving unit 50, the input end of the driving unit is connected to the first output end of the main control unit 20, the output end of the driving unit 20 is connected to the second end of the switch operating coil, and the driving unit 50 controls the on and off state of the switch operating coil according to the control signal output by the main control unit 20.

[0054] As a specific embodiment, the main control unit 20 detects the size of the input voltage and determines the corresponding rated voltage based on the size of the input voltage. When the input voltage is greater than the second threshold of the corresponding rated voltage, or is less than or equal to the third threshold of the corresponding rated voltage, the switch operating coil is controlled to be released; otherwise, the switch operating coil is controlled to be attracted; wherein, the main control unit also generates a reverse potential demagnetization when the switch operating coil is released to accelerate the release of the switch operating coil.

[0055] That is to say, the main control unit 20 monitors the input voltage signal in real time to obtain the input voltage size, judges the state of the input voltage according to the input voltage size, and outputs the corresponding control signal. After the main control unit 20 obtains the input voltage size, it determines the corresponding rated voltage according to the input voltage size. When the input voltage is greater than the second threshold value of the corresponding rated voltage, it is judged that the voltage state of the input voltage is overvoltage, and the contactor coil is controlled to be released; when the input voltage is less than or equal to the third threshold value of the corresponding rated voltage, it is judged that the voltage state of the input voltage is undervoltage, and the contactor coil is controlled to be released; otherwise, it is judged that the voltage state of the input voltage is neither overvoltage nor undervoltage, and the contactor coil is controlled to be attracted; wherein, the main control unit also generates reverse potential demagnetization when the switch operation coil is released to accelerate the release of the switch operation coil.

[0056] It should be noted that after the device is powered on, the main control unit 20 obtains the first input voltage, determines the corresponding rated voltage according to the size of the first input voltage, and can set the corresponding rated voltage as a fixed rated voltage, so that each time the device is powered on and off, the fixed rated voltage is used to judge whether the voltage state of the input voltage is overvoltage or undervoltage; the rated voltage may not be fixed, and each time the device is powered on and off, the corresponding rated voltage is re-determined according to the input voltage, and the voltage state of the input voltage is judged whether it is overvoltage or undervoltage based on the rated voltage.

[0057] As an example, multiple gears of rated voltage are pre-set, such as 10V, 20V, 30V and 40V, and the rated voltage corresponding to the input voltage range is set. For example, if the input voltage is 15-25V, the corresponding rated voltage is 20V; if it exceeds 25V and reaches 35V, the corresponding rated voltage is 30V; if it exceeds 35V and reaches 45V, the corresponding rated voltage is 40V, and so on; assuming that the main control unit 20 obtains an input voltage of 35.5V, the corresponding rated voltage is 40V, wherein the second threshold value is +35% of the corresponding rated voltage, i.e. 54V; the third threshold value is -35% of the corresponding rated voltage, i.e. 26V; when the input voltage obtained by the main control unit 20 in real time is greater than 54V, it is judged that the voltage state of the input voltage is overvoltage, and the contactor coil is controlled to be released; when the input voltage obtained by the main control unit 20 in real time is less than or equal to 26, it is judged that the voltage state of the input voltage is undervoltage, and the contactor coil is controlled to be released.

[0058] It should be noted that the above ±35% is preset according to actual needs. In addition, the rated voltage of the contactor coil is determined by the actually connected contactor coil, and the present invention does not make any specific limitation on this.

[0059] Therefore, the input voltage can be monitored in real time through the above-mentioned multi-rated voltage control circuit, and disconnection protection can be performed when overvoltage or undervoltage occurs, thereby greatly increasing the safety performance of the multi-rated voltage control circuit during use.

[0060] As an embodiment, the driving unit includes a field effect transistor (MOSFET), and the main control unit 20 outputs the processed DC low voltage to the switch operation coil through the MOSFET, and controls the on and off of the switch operation coil through a PWM control signal.

[0061] Therefore, by keeping the PWM duty cycle low, energy saving is achieved.

[0062] As an embodiment, the multi-rated voltage control circuit of the switch operating coil further includes a display unit 60, the input end of the display unit 60 is connected to the second output end of the main control unit 20, and the display unit 60 is used to display the current power supply, voltage and working status of the coil.

[0063] As a specific example, Figure 1 As shown, the red light of the display unit 60 is used to display the power status. When the power is turned on, the red light of the display unit 60 is on, otherwise it is off; the yellow light of the display unit 60 is used to display the abnormal state of the voltage. When the voltage is abnormal, such as overvoltage or undervoltage, the yellow light is on, otherwise it is off; the green light of the display unit 60 is used to display the working status. When the contactor coil is energized, the green light is on, and when the contactor coil is released, the green light is off.

[0064] Therefore, by adding a display unit, users can understand the power supply, voltage status and coil working status more intuitively and clearly, thereby greatly improving the user experience.

[0065] In summary, according to the multi-rated voltage control circuit of the switch operating coil proposed in the present invention, the input voltage is rectified and filtered by the rectification and filtering unit to output a DC voltage, the main control unit detects the input voltage to determine the voltage state of the input voltage and outputs a corresponding control signal, the DC-DC step-down unit steps down the DC voltage, and the switch switching unit controls the DC voltage to directly power the switch operating coil or the DC voltage is stepped down by the DC-DC step-down unit before powering the switch operating coil; thereby, by selecting different circuits according to different input voltages to output a voltage that can meet the working requirements of the switch operating coil, the rated voltage range of the switch operating coil is broadened, so that one rated voltage coil is suitable for multiple rated voltages, thereby reducing switch inventory and operation and maintenance costs.

[0066] In addition, if Figure 4 As shown, the embodiment of the present invention further proposes a control device 100, which includes the multi-rated voltage control circuit 200 of the switch operating coil mentioned above.

[0067] According to the control device of the embodiment of the present invention, through the multi-rated voltage control circuit of the switch operating coil, different circuits are selected according to different input voltages to output voltages that can meet the working requirements of the switch operating coil, thereby broadening the rated voltage range of the switch operating coil, making one rated voltage coil suitable for multiple rated voltages, thereby reducing switch inventory and operation and maintenance costs.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A multi-rated voltage control circuit for a switch operating coil, characterized in that: include: A rectifying and filtering unit, wherein the rectifying and filtering unit performs rectification and filtering on the input voltage to output a DC voltage; A main control unit, wherein an input end of the main control unit is connected to an input end of the rectifying and filtering unit, and the main control unit determines a voltage state of the input voltage by detecting the input voltage and outputs a corresponding control signal; A DC-DC step-down unit, wherein the input end of the DC-DC step-down unit is connected to the output end of the rectifying and filtering unit to perform a step-down process on the DC voltage; A switch switching unit, wherein the input end of the switch switching unit is respectively connected to the output end of the rectifier and filter unit and the output end of the DC-DC step-down unit, and the output end of the switch switching unit is connected to the first end of the switch operating coil, so as to control the DC voltage to directly power the switch operating coil or control the DC voltage to be stepped down by the DC-DC step-down unit before powering the switch operating coil.

2. The multi-rated voltage control circuit for a switch operating coil according to claim 1, characterized in that: The switch switching unit controls the DC voltage to directly supply power to the switch operation coil according to the corresponding control signal output by the main control unit, or the DC voltage is stepped down by the DC-DC step-down unit before supplying power to the switch operation coil.

3. The multi-rated voltage control circuit for a switch operating coil according to claim 2, characterized in that: The main control unit adaptively detects the size of the input voltage. When the input voltage is less than a preset first threshold, the DC voltage is controlled to directly supply power to the switch operation coil; when the input voltage is greater than or equal to the preset first threshold, the DC voltage is controlled to be stepped down by the DC-DC step-down unit before supplying power to the switch operation coil.

4. The multi-rated voltage control circuit of the switch operating coil according to any one of claims 1 to 3, characterized in that: Also includes: A multi-channel detection unit, wherein the input end of the multi-channel detection unit is connected to the voltage input end, the output end of the multi-channel detection unit is connected to the input end of the main control unit, the multi-channel detection unit performs branching processing on the input voltage to output the voltage value corresponding to each channel, and the main control unit adaptively screens the received voltage value of each channel to determine the selected voltage value as the final input voltage.

5. The multi-rated voltage control circuit for a switch operating coil according to claim 4, characterized in that: The main control unit predefines the input voltage range corresponding to each channel, so that when receiving the voltage value of each channel, it adaptively determines whether it is within the corresponding input voltage range according to the voltage value received for each channel. If so, the voltage value corresponding to the input voltage range is determined as the final input voltage.

6. The multi-rated voltage control circuit for a switch operating coil according to claim 1, characterized in that: The switch switching unit controls the DC voltage to directly supply power to the switch operation coil according to the manual switching signal, or the DC voltage is stepped down by the DC-DC step-down unit before supplying power to the switch operation coil.

7. The multi-rated voltage control circuit for a switch operating coil according to claim 1, characterized in that: Also includes: A power supply unit, wherein the input end of the power supply unit is connected to the output end of the rectifying and filtering unit, and the power supply unit is used to step down the DC voltage so as to provide a stable driving voltage for the main control unit and the switching unit.

8. The multi-rated voltage control circuit for a switch operating coil according to claim 1, characterized in that: Also includes: A driving unit, wherein the input end of the driving unit is connected to the first output end of the main control unit, the output end of the driving unit is connected to the second end of the switch operation coil, and the driving unit controls the on-off state of the switch operation coil according to the control signal output by the main control unit.

9. The multi-rated voltage control circuit for a switch operating coil according to claim 8, characterized in that: The main control unit detects the size of the input voltage and determines the corresponding rated voltage according to the size of the input voltage. When the input voltage is greater than a second threshold value of the corresponding rated voltage, or is less than or equal to a third threshold value of the corresponding rated voltage, the switch operating coil is controlled to be released; otherwise, the switch operating coil is controlled to be attracted; wherein, the main control unit also generates a reverse potential demagnetization when the switch operating coil is released to accelerate the release of the switch operating coil.

10. The multi-rated voltage control circuit for a switch operating coil according to claim 8, characterized in that: The main control unit controls the on and off of the switch operation coil through a PWM control signal.

11. The multi-rated voltage control circuit for a switch operating coil according to claim 1, characterized in that: Also includes: A display unit, wherein the input end of the display unit is connected to the second output end of the main control unit, and the display unit is used to display the current power supply, voltage and working status of the coil.

12. A control device, characterized in that: A multi-rated voltage control circuit comprising a switch operating coil as claimed in any one of claims 1 to 11.

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