CN110504134B - Relay control circuit and relay control device - Google Patents
Relay control circuit and relay control device Download PDFInfo
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- CN110504134B CN110504134B CN201910683700.8A CN201910683700A CN110504134B CN 110504134 B CN110504134 B CN 110504134B CN 201910683700 A CN201910683700 A CN 201910683700A CN 110504134 B CN110504134 B CN 110504134B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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Abstract
The application discloses a relay control circuit, which comprises a relay power supply circuit and a first control circuit; the relay power supply circuit is used for outputting a first voltage to the first control circuit; the first control circuit comprises an energy storage capacitor, and is used for clamping a low potential end of the energy storage capacitor to the first voltage to obtain a second voltage and outputting the second voltage to the relay coil to close the relay when the relay power supply circuit outputs the first voltage and the controller outputs a driving signal; wherein the second voltage is higher than the first voltage. The relay control circuit can quickly close the relay. The application also discloses a relay control device, and the relay control device also has the technical effects.
Description
Technical Field
The application relates to the technical field of automatic control, in particular to a relay control circuit; still relate to a relay control device.
Background
As an electric control device, a relay is generally applied to an automatic control circuit, and is an automatic switch which controls a large current operation through a small current, and plays roles of automatic adjustment, safety protection, conversion circuit and the like in the automatic control circuit. As a key device in an automation control circuit, the closing speed of a relay is related to the automation control efficiency, and in view of this, how to provide a relay control scheme and achieve rapid control of the relay has become a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The application aims at providing a relay control circuit and a relay control device, which can realize rapid closing of a relay.
In order to solve the above technical problem, the present application provides a relay control circuit, including:
the relay power supply circuit and the first control circuit;
the relay power supply circuit is used for outputting a first voltage to the first control circuit;
the first control circuit comprises an energy storage capacitor, is used for providing the energy storage capacitor for charging when the relay power supply circuit outputs the first voltage, and obtains a second voltage by clamping a low potential end of the energy storage capacitor to the first voltage and outputs the second voltage to the relay coil when the controller outputs a driving signal so as to close the relay; wherein the second voltage is higher than the first voltage.
Optionally, the first control circuit further includes:
the circuit comprises a first diode, a first controllable switch, a second controllable switch, a first resistor, a second resistor, a third resistor and a fourth resistor;
the anode of the first diode is respectively connected with the output end of the relay power supply circuit and the first end of the first controllable switch, the cathode of the first diode is connected with the first end of the energy storage capacitor, the second end of the first controllable switch is connected with the second end of the energy storage capacitor, the control end of the first controllable switch is connected with the second end of the second controllable switch after being connected with the third resistor in series, the first end of the energy storage capacitor is also connected with one end of the relay coil, the second end of the energy storage capacitor is also connected with the second resistor in series and then grounded, two ends of the first resistor are respectively connected with the first end and the control end of the first controllable switch, the second end of the second controllable switch is also connected with the other end of the relay coil, the first end of the second controllable switch is grounded, and the control end of the second controllable switch is connected with the controller after being connected with the fourth resistor in series.
Optionally, the method further includes:
the second control circuit is used for delaying a preset time length and then outputting a level signal to the relay power supply circuit when the controller outputs the driving signal, so that the relay power supply circuit stops outputting the first voltage and the first control circuit outputs a third voltage to the relay coil to maintain the closed state of the relay; wherein the third voltage is lower than the first voltage.
Optionally, the second control circuit includes:
the second diode, the fifth resistor, the sixth resistor, the first capacitor and the comparator;
the second diode with the fifth resistance is parallelly connected, just the positive pole of second diode is connected respectively the one end of first electric capacity with the reverse input end of comparator, the negative pole of second diode is connected the controller, the other end ground connection of first electric capacity, the syntropy input end of comparator connects the fourth voltage, the output of comparator is connected the one end of sixth resistance and relay supply circuit, the other end connection power of sixth resistance.
Optionally, the first power supply circuit, of which the output voltage is the fourth voltage, includes:
a seventh resistor, an eighth resistor and a second capacitor;
one end of the seventh resistor is connected with a power supply, the other end of the seventh resistor is connected with a first common end of the eighth resistor and the second capacitor in parallel and serves as an output end of the first power supply circuit, and a second common end of the eighth resistor and the second capacitor in parallel is grounded.
Optionally, the relay power supply circuit includes:
a third controllable switch, a fourth controllable switch, a ninth resistor, a tenth resistor, and an eleventh resistor;
the first end of the third controllable switch is connected with a power supply, the control end of the third controllable switch is connected with the second end of the fourth controllable switch after being connected with the tenth resistor in series, the second end of the third controllable switch serves as the output end of the relay power supply circuit, the control end of the fourth controllable switch is connected with the second control circuit after being connected with the eleventh resistor in series, the first end of the fourth controllable switch is grounded, and two ends of the ninth resistor are respectively connected with the first end and the control end of the third controllable switch.
Optionally, the second power supply circuit, of which the output voltage is the third voltage, includes:
a buck converter, an inductor and a third diode;
the input end of the buck converter is connected with a power supply, the output end of the buck converter is connected with one end of the inductor, the other end of the inductor is connected with the anode of the third diode, and the cathode of the third diode is used as the output end of the second power supply circuit.
Optionally, each controllable switch is specifically a triode.
In order to solve the technical problem, the present application further provides a relay control device, which includes a controller and the relay control circuit as described in any one of the above.
The relay control circuit comprises a relay power supply circuit and a first control circuit; the relay power supply circuit is used for outputting a first voltage to the first control circuit; the first control circuit comprises an energy storage capacitor, and is used for clamping a low potential end of the energy storage capacitor to the first voltage to obtain a second voltage and outputting the second voltage to the relay coil to close the relay when the relay power supply circuit outputs the first voltage and the controller outputs a driving signal; wherein the second voltage is higher than the first voltage.
Therefore, on the basis that the relay power supply circuit outputs the first voltage, after the first control circuit receives the driving signal output by the controller, the first control circuit can clamp the low potential end of the energy storage capacitor to the first voltage, and then obtain the second voltage higher than the first voltage, so that the second voltage with a higher voltage value is provided for the coil of the relay, the relay is enabled to be rapidly closed under the driving of the second voltage, the action time of the relay is shortened, and the rapid control of the relay is realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the prior art and the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a relay control circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit schematic diagram of a first control circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another relay control circuit provided in the embodiment of the present application;
FIG. 4 is a diagram of a second control circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of a relay power supply circuit according to an embodiment of the present disclosure;
fig. 6 is a circuit schematic diagram of a second power supply circuit according to an embodiment of the present disclosure.
Detailed Description
The core of the application is to provide a relay control circuit and a relay control device, which can realize the rapid closing of a relay.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a circuit schematic diagram of a relay control circuit according to an embodiment of the present disclosure; referring to fig. 1, the relay control circuit includes: the relay power supply circuit 10 and the first control circuit 20; a relay power supply circuit 10 for outputting a first voltage to the first control circuit 20; the first control circuit 20 comprises an energy storage capacitor C, and is used for providing the energy storage capacitor with charging when the relay power supply circuit 10 outputs a first voltage, obtaining a second voltage by clamping a low potential end of the energy storage capacitor C to the first voltage when the controller outputs a driving signal, and outputting the second voltage to the relay coil so as to close the relay; wherein the second voltage is higher than the first voltage.
Specifically, the relay power supply circuit 10 is mainly responsible for outputting a first voltage to the first control circuit 20, so that the first control circuit 20 charges the energy storage capacitor C on the basis of accessing the first voltage, and after the first control circuit 20 receives a driving signal output by the controller, the first control circuit 20 can clamp the low potential end of the energy storage capacitor C therein to the first voltage to obtain a second voltage higher than the first voltage, and further output the second voltage to the relay coil, so as to drive the relay to be closed by using the second voltage.
The first control circuit 20 is mainly used for clamping a low potential end of an energy storage capacitor C in the first control circuit 20 to a first voltage to obtain a second voltage higher than the first voltage after receiving a driving signal output by a controller on the basis of accessing the first voltage output by the relay power supply circuit 10, and outputting the second voltage to a relay coil, so that the relay is driven by the second voltage to quickly operate and close the relay.
The circuit structure of the first control circuit 20 is not specifically limited in this application, and may be set differently according to actual application needs.
In a specific embodiment, the first control circuit 20 may further include a first diode D1, a first controllable switch, a second controllable switch, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4 in addition to the energy storage capacitor C; the anode of the first diode D1 is connected with the output end of the relay power supply circuit and the first end of the first controllable switch respectively, the cathode of the first diode D1 is connected with the first end of the energy storage capacitor C, the second end of the first controllable switch is connected with the second end of the energy storage capacitor C, the control end of the first controllable switch is connected with the second end of the second controllable switch after being connected with the third resistor R3 in series, the first end of the energy storage capacitor C is also connected with one end of the relay coil, the second end of the energy storage capacitor C is also connected with the second resistor R2 in series and then is grounded, the two ends of the first resistor R1 are connected with the first end and the control end of the first controllable switch respectively, the second end of the second controllable switch is also connected with the other end of the relay coil, the first end of the second controllable switch is grounded in series, and the control end of the second controllable switch is connected with the controller after being connected with the fourth resistor R4.
Based on the above circuit configuration, the operating state of the first control circuit 20 is as follows:
before the controller outputs a high-level driving signal, that is, when the level of the control terminal of the second controllable switch in the first control circuit 20 is a low level, the first controllable switch and the second controllable switch are in an off state, at this time, a first voltage output by the relay power supply circuit 10 and the first diode D1, the energy storage capacitor C and the second resistor R2 of the first control circuit 20 form a charging loop, and the first voltage charges the energy storage capacitor C, so that the voltage difference between the high potential terminal and the low potential terminal of the energy storage capacitor C is close to the first voltage. When the controller outputs a high-level driving signal to the control end of the second controllable switch in the first control circuit 20, the first controllable switch and the second controllable switch are both turned on, and the low-potential end of the energy-storage capacitor C is instantly clamped to the first voltage because the low-potential end of the energy-storage capacitor C is instantly connected to the first voltage, so that the voltage of the high-potential end of the energy-storage capacitor C is instantly boosted to a voltage close to twice the first voltage, that is, the second voltage, from the voltage close to the first voltage on the basis that the voltage difference between the high-potential end and the low-potential end of the energy-storage capacitor C is close to the first voltage, and the relay is driven to be rapidly closed by the second voltage.
Further, referring to fig. 2, in a specific embodiment, the first controllable switch and the second controllable switch may be specifically transistors, wherein an emitter of the transistor is a first end, a collector of the transistor is a second end, and a base of the transistor is a control end. The transistor Q1 is a PNP transistor, and the transistor Q2 is an NPN transistor. In addition, the base and the emitter of the transistor Q2 can be connected in parallel with a resistor and a capacitor for filtering processing. In fig. 2, 12V _ RLY represents the first voltage, and RLY _ DR represents the driving signal output by the controller. In another embodiment, the first controllable switch and the second controllable switch may be MOS transistors (Metal-Oxide-Semiconductor Field-Effect transistors) or IGBT transistors (Insulated Gate Bipolar transistors).
Further, referring to fig. 3, in a specific embodiment, the relay control circuit may further include a second control circuit 30, configured to output a level signal to the relay power supply circuit 10 after delaying for a preset time period when the controller outputs the driving signal, so that the relay power supply circuit 10 stops outputting the first voltage and the first control circuit outputs a third voltage to the relay coil to maintain the closed state of the relay; wherein the third voltage is lower than the first voltage.
Specifically, the second control circuit 30 is mainly used for controlling the voltage output state of the relay power supply circuit 10. Specifically, after the second control circuit 30 receives the driving signal output by the controller, the second control circuit 30 delays for a preset time period (the relay is closed) and outputs a level signal to the relay power supply circuit 10, so that the relay power supply circuit 10 stops outputting the first voltage even if the voltage value output by the relay power supply circuit 10 becomes zero. And then the first control circuit 20 outputs a third voltage lower than the first voltage to the relay coil (at this time, the high potential end of the energy storage capacitor C in the first control circuit 20 is connected with the third voltage, such as 7V shown in fig. 2, and the high potential end of the energy storage capacitor C is connected with the third voltage after being connected with the diode D in series, the anode of the specific diode D is connected with the third voltage, and the cathode is connected with the high potential end of the energy storage capacitor C), so as to maintain the closed state of the relay by using the third voltage, that is, the closed state of the relay is maintained by replacing the high voltage with the low voltage, thereby effectively reducing the power consumption of the relay. The specific voltage value of the third voltage can be adaptively set by combining with the operation parameters of the relay, and on the basis of maintaining the relay closed, preferably, the third voltage is set to be a lower voltage value as much as possible, so as to reduce the power consumption of the relay to the maximum extent.
Referring to fig. 4, in a specific embodiment, the second control circuit 30 may include a second diode D2, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a comparator; the second diode D2 is connected in parallel with the fifth resistor R5, the anode of the second diode D2 is connected with one end of the first capacitor C1 and the reverse input end of the comparator respectively, the cathode of the second diode D2 is connected with the controller, the other end of the first capacitor C1 is grounded, the same-direction input end of the comparator is connected with the fourth voltage, the output end of the comparator is connected with one end of the sixth resistor R6 and the control end of the relay power supply circuit, and the other end of the sixth resistor R6 is connected with the power supply.
Based on the above circuit configuration, the operating state of the second control circuit 30 is as follows:
when the controller does not output the driving signal of the high level to the second control circuit 30, the voltage of the non-inverting input terminal of the comparator, i.e., the fourth voltage, in the second control circuit 30 is higher than the voltage of the inverting input terminal, so that the comparator outputs the high level. When the controller outputs a high-level driving signal to the second control circuit 30, the first capacitor C1 in the second control circuit 30 charges, so that the voltage at the inverting input terminal of the comparator is higher than the voltage at the non-inverting input terminal, and the comparator outputs a low level.
In a specific embodiment, the first power supply circuit with the output voltage being the fourth voltage may include a seventh resistor R7, an eighth resistor R8, and a second capacitor C2; one end of the seventh resistor R7 is connected to the power supply, the other end of the seventh resistor R7 is connected to the first common terminal of the eighth resistor R8 connected in parallel to the second capacitor C2 and serves as the output terminal of the first power supply circuit, and the second common terminal of the eighth resistor R8 connected in parallel to the second capacitor C2 is grounded. As shown in fig. 4, the first power supply circuit is connected to a power supply, and performs resistance voltage division by using the seventh resistor R7 and the eighth resistor R8, so that the voltage of the eighth resistor R8 is connected to the unidirectional input terminal of the comparator as a fourth voltage. Since the high level of the normal controller output is 3.3V, the fourth voltage may be set to a voltage value lower than the 3.3V, and the voltage value of the power supply connected to the first power supply circuit and the resistance values of the tenth resistor R10 and the eleventh resistor R11 may be determined according to the set voltage value of the fourth voltage. For example, the fourth voltage is set to 2.6V, the voltage value of the correspondingly connected power source may be 7V, and the resistance values of the seventh resistor R7 and the eighth resistor R8 may be 10K Ω and 6.2K Ω, respectively.
Further, based on the above-mentioned embodiments, in a specific implementation, the relay power supply circuit 10 may include a third controllable switch, a fourth controllable switch, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11; the first end of the third controllable switch is connected with the power supply, the control end of the third controllable switch is connected with the second end of the fourth controllable switch after being connected with the tenth resistor R10 in series, the second end of the third controllable switch is used as the output end of the relay power supply circuit, the control end of the fourth controllable switch is connected with the second control circuit 30 after being connected with the eleventh resistor R11 in series, the first end of the fourth controllable switch is grounded, and the two ends of the ninth resistor R9 are respectively connected with the first end and the control end of the third controllable switch.
Based on the above circuit configuration, the relay power supply circuit 10 operates as follows:
when the level of the control end of the relay power supply circuit 10, that is, the control end of the fourth controllable switch, is a high level, the third controllable switch and the fourth controllable switch are turned on, and the relay power supply circuit 10 outputs the first voltage. When the level of the control end of the relay power supply circuit 10 is a low level, the third controllable switch and the fourth controllable switch are both turned off, so that the relay power supply circuit 10 does not output the first voltage any more, that is, the voltage value output by the relay power supply circuit 10 becomes zero. The voltage value of the first voltage is related to the voltage value of the power supply connected to the relay power supply circuit 10, and as for the specific value of the first voltage, a corresponding power supply may be set according to actual needs. For example, when the relay power supply circuit is connected to a 12V power supply, the corresponding first voltage is 12V.
Further, referring to fig. 5, in a specific embodiment, the third controllable switch and the fourth controllable switch may be specifically transistors, and similarly, the emitter of the transistor is a first terminal, the collector of the transistor is a second terminal, and the base of the transistor is a control terminal. The transistor Q3 is a PNP transistor, and the transistor Q4 is an NPN transistor. In addition, the output end of the relay power supply circuit 10, i.e., the collector of the transistor Q3, may also be connected to a filter capacitor.
It should be understood that the specific type of the controllable switch in the above embodiments is only one specific implementation provided in the present application, and is not limited only, and a person skilled in the art may also select other types of controllable switches, such as a MOS Transistor (Metal-Oxide-Semiconductor Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), and the like, on the basis that the above functions of the relay power supply circuit 10 can be implemented.
In addition, in a specific embodiment, the second power supply circuit whose output voltage is the third voltage may include a buck converter, an inductor, and a third diode D3; the input end of the buck converter is connected with a power supply, the output end of the buck converter is connected with one end of an inductor, the other end of the inductor is connected with the anode of a third diode D3, and the cathode of a third diode D3 serves as the output end of the second power supply circuit.
Specifically, referring to fig. 6, in the present embodiment, a step-down conversion manner is adopted to provide the third voltage (7V as shown in fig. 6) to the first control circuit 20, specifically, the third voltage is output via the inductor and the third diode D3 after a power supply connected to the second power supply circuit is stepped down by the step-down converter. In order to ensure the stability of the output third voltage, a filter capacitor may be connected between the input end of the buck converter and the inductor and the third diode D3. As shown in fig. 6, a VIN pin of the buck converter is connected to a first filtering branch formed by a diode and a filtering capacitor connected in parallel, a SW pin of the buck converter is connected to one end of an inductor L, and the other end of the inductor L is connected to a second filtering branch formed by a filtering capacitor connected in parallel and an anode of a third diode D3.
In summary, according to the relay control circuit provided by the application, on the basis that the relay power supply circuit outputs the first voltage, after the first control circuit receives the driving signal output by the controller, the first control circuit can clamp the low potential end of the energy storage capacitor therein to the first voltage, so as to obtain the second voltage higher than the first voltage, and thus the second voltage with a higher voltage value is provided to the relay coil, so that the relay is driven by the second voltage to be quickly closed, the action time of the relay is shortened, and the quick control of the relay is realized.
The present application also provides a relay control device including a controller and a relay control circuit as described in the above embodiments. For the relay control device, the description of the relay control device is omitted, and the description of the relay control circuit can be referred to.
Because the situation is complicated and cannot be illustrated by a list, those skilled in the art can appreciate that there can be many examples in combination with the actual situation under the basic principle of the embodiments provided in the present application and that it is within the scope of the present application without sufficient inventive effort.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The relay control circuit and the relay control device provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (8)
1. A relay control circuit, comprising:
the relay power supply circuit and the first control circuit;
the relay power supply circuit is used for outputting a first voltage to the first control circuit;
the first control circuit comprises an energy storage capacitor, is used for providing the energy storage capacitor for charging when the relay power supply circuit outputs the first voltage, and obtains a second voltage by clamping a low potential end of the energy storage capacitor to the first voltage and outputs the second voltage to the relay coil when the controller outputs a driving signal so as to close the relay; wherein the second voltage is higher than the first voltage;
further comprising:
the second control circuit is used for outputting a level signal to the relay power supply circuit after delaying a preset time length when the controller outputs the driving signal, so that the relay power supply circuit stops outputting the first voltage and the first control circuit outputs a third voltage to the relay coil to maintain the closed state of the relay; wherein the third voltage is lower than the first voltage.
2. The relay control circuit of claim 1, wherein the first control circuit further comprises:
the circuit comprises a first diode, a first controllable switch, a second controllable switch, a first resistor, a second resistor, a third resistor and a fourth resistor;
the anode of the first diode is respectively connected with the output end of the relay power supply circuit and the first end of the first controllable switch, the cathode of the first diode is connected with the first end of the energy storage capacitor, the second end of the first controllable switch is connected with the second end of the energy storage capacitor, the control end of the first controllable switch is connected with the second end of the second controllable switch after being connected with the third resistor in series, the first end of the energy storage capacitor is also connected with one end of the relay coil, the second end of the energy storage capacitor is also connected with the second resistor in series and then grounded, two ends of the first resistor are respectively connected with the first end and the control end of the first controllable switch, the second end of the second controllable switch is also connected with the other end of the relay coil, the first end of the second controllable switch is grounded, and the control end of the second controllable switch is connected with the controller after being connected with the fourth resistor in series.
3. The relay control circuit of claim 1, wherein the second control circuit comprises:
the second diode, the fifth resistor, the sixth resistor, the first capacitor and the comparator;
the second diode with the fifth resistance is parallelly connected, just the positive pole of second diode is connected respectively the one end of first electric capacity with the reverse input end of comparator, the negative pole of second diode is connected the controller, the other end ground connection of first electric capacity, the syntropy input end of comparator connects the fourth voltage, the output of comparator is connected the one end of sixth resistance and relay supply circuit, the other end connection power of sixth resistance.
4. The relay control circuit of claim 3, wherein the first power supply circuit outputting the fourth voltage comprises:
a seventh resistor, an eighth resistor and a second capacitor;
one end of the seventh resistor is connected with a power supply, the other end of the seventh resistor is connected with a first common end of the eighth resistor and the second capacitor in parallel and serves as an output end of the first power supply circuit, and a second common end of the eighth resistor and the second capacitor in parallel is grounded.
5. The relay control circuit of claim 1, wherein the relay power supply circuit comprises:
a third controllable switch, a fourth controllable switch, a ninth resistor, a tenth resistor, and an eleventh resistor;
the first end of the third controllable switch is connected with a power supply, the control end of the third controllable switch is connected with the second end of the fourth controllable switch after being connected with the tenth resistor in series, the second end of the third controllable switch serves as the output end of the relay power supply circuit, the control end of the fourth controllable switch is connected with the second control circuit after being connected with the eleventh resistor in series, the first end of the fourth controllable switch is grounded, and two ends of the ninth resistor are respectively connected with the first end and the control end of the third controllable switch.
6. The relay control circuit according to claim 1, wherein the second power supply circuit that outputs the third voltage comprises:
a buck converter, an inductor and a third diode;
the input end of the buck converter is connected with a power supply, the output end of the buck converter is connected with one end of the inductor, the other end of the inductor is connected with the anode of the third diode, and the cathode of the third diode is used as the output end of the second power supply circuit.
7. The relay control circuit according to claim 2 or 5, wherein each controllable switch is embodied as a triode.
8. A relay control device, characterized in that it comprises a controller and a relay control circuit according to any one of claims 1 to 7.
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| DE1276125B (en) * | 1963-12-10 | 1968-08-29 | Licentia Gmbh | Circuit arrangement for reducing or counting pulses |
| CN2596535Y (en) * | 2002-09-04 | 2003-12-31 | 正泰集团公司 | Controller of general contactor electromagnetic system |
| CN1840788A (en) * | 2005-04-01 | 2006-10-04 | Smc株式会社 | Solenoid-operated valve and solenoid-operated valve-driving circuit |
| CN101728819A (en) * | 2009-11-20 | 2010-06-09 | 深圳市科陆电子科技股份有限公司 | Intelligent switch and control method thereof |
| CN101950709A (en) * | 2010-09-17 | 2011-01-19 | 上海诺雅克电气有限公司 | Low-voltage holding contactor |
| CN102420078A (en) * | 2012-01-04 | 2012-04-18 | 北京馨容纵横科技发展有限公司 | Synchronous switch control circuit for common electromagnetic contactor |
| CN102709119A (en) * | 2012-06-01 | 2012-10-03 | 华为技术有限公司 | Relay driving device |
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| CN110504134A (en) | 2019-11-26 |
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