CN211481491U - Relay control circuit, drive circuit and electrical equipment - Google Patents
Relay control circuit, drive circuit and electrical equipment Download PDFInfo
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- CN211481491U CN211481491U CN202020232894.8U CN202020232894U CN211481491U CN 211481491 U CN211481491 U CN 211481491U CN 202020232894 U CN202020232894 U CN 202020232894U CN 211481491 U CN211481491 U CN 211481491U
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- switch tube
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Abstract
The utility model relates to a relay control circuit, drive circuit and electrical equipment, relay control circuit control switch pipe, current-limiting resistance subassembly and protective resistance subassembly, the input of control switch pipe is used as the coil of connecting the relay, and the control end of control switch pipe passes through current-limiting resistance subassembly connection director, and the output of control switch pipe passes through protective resistance subassembly ground connection. The output end of the control switch tube is connected with the protection resistor assembly in series, the protection resistor assembly fails due to the increased current after the control switch tube is broken down, the purpose of stopping the relay is achieved, the relay can be guaranteed not to continuously work when the circuit fails, and compared with a traditional relay control circuit, the control reliability is improved.
Description
Technical Field
The application relates to the technical field of intelligent electrical equipment, in particular to a relay control circuit, a driving circuit and electrical equipment.
Background
With the development of science and technology and the continuous progress of society, more and more household appliances appear in the daily life of people. At present many cooking utensils all can use the relay to control the heat-generating body, and traditional relay control circuit is controlled by the triode mostly, when triode CE utmost point was punctured by overvoltage such as static, then the relay can be in the normally closed state, and the uncontrollable unanimity of heat-generating body can be in the heating state and there is the risk. The traditional relay control circuit has the defect of low control reliability.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide a relay control circuit, a drive circuit, and an electric device, which can improve control reliability, in order to solve the problem of low control reliability of the conventional relay control circuit.
The utility model provides a relay control circuit, includes control switch pipe, current-limiting resistance subassembly and protection resistance subassembly, the input of control switch pipe is used as the coil of connecting the relay, the control end of control switch pipe passes through current-limiting resistance subassembly connection director, the output of control switch pipe passes through protection resistance subassembly ground connection.
In one embodiment, the control switch tube is a triode or a MOS tube.
In one embodiment, the current-limiting resistor assembly comprises a current-limiting resistor, and the control end of the control switch tube is connected with the controller through the current-limiting resistor.
In one embodiment, the protection resistor assembly includes a protection resistor, and the output end of the control switch tube is grounded through the protection resistor.
In one embodiment, the protection resistor is a wire-wound resistor.
In one embodiment, the relay control circuit further includes a capacitor and a diode, a cathode of the diode is connected to a first end of the coil of the relay, an anode of the diode is connected to a second end of the coil of the relay, two ends of the capacitor are respectively connected to a cathode and an anode of the diode, and an input end of the control switch tube is connected to the second end of the coil of the relay.
A driving circuit comprises a controller, a relay and the relay control circuit, wherein the controller is connected with a control end of a control switch tube, an input end of the control switch tube is connected with a coil of the relay, and a contact switch of the relay is used for being connected with a controlled device.
In one embodiment, the controller is an MCU (Micro Control Unit).
The electric appliance equipment comprises a controlled device and the driving circuit, wherein the contact switch of the relay is connected with the controlled device.
In one embodiment, the electrical appliance is a cooking appliance, and the controlled device is a heating body.
According to the relay control circuit, the drive circuit and the electrical equipment, the protection resistor assembly is connected in series at the output end of the control switch tube, the protection resistor assembly fails due to the increased current after the control switch tube is broken down, the purpose of stopping the relay to work is achieved, the relay can be guaranteed not to continuously work when the circuit fails, and compared with the traditional relay control circuit, the control reliability is improved.
Drawings
FIG. 1 is a block diagram of a relay control circuit according to an embodiment;
fig. 2 is a schematic diagram of a relay control circuit in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, a relay control circuit is provided, as shown in fig. 1, including a control switch tube 110, a current limiting resistor assembly 120, and a protection resistor assembly 130, wherein an input terminal of the control switch tube 110 is used as a coil connected to the relay 210, a control terminal of the control switch tube 110 is connected to the controller 220 through the current limiting resistor assembly 120, and an output terminal of the control switch tube 110 is grounded through the protection resistor assembly 130.
Specifically, the control switch tube 110 may be a transistor or a MOS tube. Taking a triode as an example, as shown in fig. 2, the control switch tube 110 includes a triode Q1, a base of the triode Q1 is used as a control terminal, and is connected to the controller 220 through the current limiting resistor component 120, a collector of the triode Q1 is used as an input terminal connected to one end of the coil of the relay 210, the other end of the coil of the relay 210 is connected to the power supply input terminal, and the contact switch of the relay 210 is used as a connection controlled device. The emitter of the transistor Q1 is connected as an output terminal to ground through the protection resistor 130. The controller 220 controls the on/off of the control switch tube 110 through the output level signal, when the control switch tube 110 is turned on, the coil of the relay 210 is electrified, and the contact switch is closed, so that the controlled device is electrified to work.
The structures of the current limiting resistor assembly 120 and the protection resistor assembly 130 are not unique, and a single resistor may be used, or a plurality of resistors may be connected in series. In one embodiment, as shown in fig. 2, the current limiting resistor assembly 120 includes a current limiting resistor R1, and the control terminal of the control switch Q1 is connected to the controller 220 through the current limiting resistor R1. The current limiting protection is carried out through the current limiting resistor R1, and the control switch tube 110 is prevented from being damaged by overhigh current.
Further, in one embodiment, the protection resistor assembly 130 includes a protection resistor R2, and the output terminal of the control switch tube 110 is grounded through the protection resistor R2. When the control switch tube 110 is broken down, the voltage and the current at two ends of the protection resistor R2 increase, and when the flowing current is too large, the protection resistor R2 fails and is in an open state, so that the relay 210 cannot normally operate and is not always in a normally closed state. The type of the protection resistor R2 is not exclusive and any resistor can be selected so long as the actual power used by the resistor exceeds the nominal power of the resistor, the resistor will fail to blow due to the excessive power. In this embodiment, the protection resistor R2 is a wire resistor. The winding resistor is used as a protection resistor, the action is sensitive, and the fire cannot be generated after the failure.
In addition, in one embodiment, the relay control circuit further includes a capacitor C1 and a diode D1, a cathode of the diode D1 is connected to a first end of the coil of the relay 210, an anode of the diode D1 is connected to a second end of the coil of the relay 210, two ends of the capacitor C1 are respectively connected to a cathode and an anode of the diode D1, and an input end of the control switch tube 110 is connected to the second end of the coil of the relay 210. Wherein, a first end of the coil of the relay 210 is connected to the power input terminal. When the on-off of the relay 210 is controlled by controlling the switch tube 110, the capacitor C1 and the diode D1 are used for absorbing the transient voltage spike generated by the coil of the relay 210, so that the transient voltage spike is prevented from damaging electronic components, and the operation reliability of the circuit is improved.
According to the relay control circuit, the protection resistor assembly 130 is connected in series at the output end of the control switch tube 110, the protection resistor assembly 130 fails due to the increased current generated after the control switch tube 110 is broken down, so that the relay 210 stops working, the relay 210 does not continuously work when the circuit fails, and compared with the traditional relay control circuit, the control reliability is improved.
In one embodiment, a driving circuit is provided, as shown in fig. 1, and includes a controller 220, a relay 210 and the above-mentioned relay control circuit, the controller 220 is connected to the control terminal of the control switch tube 110, the input terminal of the control switch tube 110 is connected to the coil of the relay 210, and the contact switch of the relay 210 is used for connecting the controlled device. Specifically, the contact switch of the relay 210 forms a loop with the power supply and the controlled device, and when the contact switch is closed, the controlled device is electrified to work. The controlled device can be a heating body, and also can be a lighting lamp or a fan and other devices. The specific type of the controller 220 is not exclusive, and in the present embodiment, the controller 220 is an MCU.
According to the driving circuit, the protection resistor assembly 130 is connected in series at the output end of the control switch tube 110, and the increased current after the control switch tube 110 is broken down enables the protection resistor assembly 130 to fail so as to stop the relay 210 to work, so that the relay 210 can be ensured not to continuously work when the circuit fails, and the control reliability is improved.
In one embodiment, an electrical apparatus is also provided, which includes a controlled device and the above driving circuit, and the contact switch of the relay 210 is connected to the controlled device. Specifically, one end of the contact switch is connected to a power supply, the other end of the contact switch is connected to one end of the controlled device, and the other end of the controlled device is grounded. The controlled device can be any device needing to be electrified to work, in the embodiment, the electrical equipment is a cooking appliance, and the controlled device is a heating body. The controller 220 controls the on/off of the switch tube 110 to change the state of the relay 210. When the contact switch of the relay 210 is closed, the heating body is energized in a heating state. The heating body can be a heating wire, a heating plate and the like.
According to the electrical equipment, the protection resistor assembly 130 is connected in series at the output end of the control switch tube 110, the protection resistor assembly 130 fails due to the increased current after the control switch tube 110 is broken down, so that the purpose of stopping the relay 210 from working is achieved, the relay 210 can be ensured not to continuously work when a circuit fails, and the control reliability is improved.
In order to better understand the relay control circuit, the driving circuit and the electrical equipment, the following detailed explanation is provided with specific embodiments.
The conventional relay is controlled by a triode, when the triode B is at a high level, the triode CE is conducted, and then a power supply, the relay, the triode and the ground form a loop, and the relay works. In the failure mode of the triode, if a CE electrode is broken down by external factors such as static electricity and the like, a B electrode of the triode cannot control a CE electrode switch, the relay is always in an on state, and a heating device is always in a heating state, so that potential safety hazards exist. The relay control circuit provided by the application is characterized in that a protective resistor R2 is additionally arranged between the E pole of a triode Q1 and the ground, and when the triode Q1 breaks down due to external factors, the protective resistor R2 fails to ensure that the relay 210 is not turned on for a long time. The CE pole of the transistor Q1 has a certain voltage drop (different types of transistor voltage drops) when it is normally turned on, and the voltage across the protective resistor R2 is the power voltage minus the voltage divided by the winding resistor of the coil of the relay 210 minus the voltage drop of the CE pole of the transistor Q1 when it is normal. By selecting a proper protection resistor R2, when the triode Q1 is broken down, the voltage of the CE electrode is zero, the voltage at the two ends of the protection resistor R2 is increased, the current is increased, the protection resistor R2 just cannot bear the increased current at the moment, the protection resistor R2 fails, the relay 210 cannot normally work, and the heating appliance also stops working due to the failure of the triode Q1.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The relay control circuit is characterized by comprising a control switch tube, a current-limiting resistor assembly and a protection resistor assembly, wherein the input end of the control switch tube is used as a coil for connecting a relay, the control end of the control switch tube is connected with a controller through the current-limiting resistor assembly, and the output end of the control switch tube is grounded through the protection resistor assembly.
2. The relay control circuit according to claim 1, wherein the control switch tube is a triode or a MOS tube.
3. The relay control circuit of claim 1, wherein the current limiting resistor assembly comprises a current limiting resistor, and the control terminal of the control switch tube is connected to a controller through the current limiting resistor.
4. The relay control circuit of claim 1, wherein the protective resistor assembly comprises a protective resistor through which the output of the control switch tube is grounded.
5. The relay control circuit of claim 4, wherein the protection resistor is a wire-wound resistor.
6. The relay control circuit according to claim 1, further comprising a capacitor and a diode, wherein a cathode of the diode is connected to the first end of the coil of the relay, an anode of the diode is connected to the second end of the coil of the relay, two ends of the capacitor are respectively connected to the cathode and the anode of the diode, and an input end of the control switch tube is connected to the second end of the coil of the relay.
7. A driving circuit, comprising a controller, a relay and a relay control circuit as claimed in any one of claims 1 to 6, wherein the controller is connected to the control end of the control switch tube, the input end of the control switch tube is connected to the coil of the relay, and the contact switch of the relay is used for connecting a controlled device.
8. The driver circuit of claim 7, wherein the controller is an MCU.
9. An electrical apparatus, characterized in that it comprises a controlled device and a drive circuit according to claim 7 or 8, the contact switch of the relay being connected to the controlled device.
10. The electrical apparatus according to claim 9, wherein the electrical apparatus is a cooking appliance and the controlled device is a heat-generating body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020232894.8U CN211481491U (en) | 2020-02-28 | 2020-02-28 | Relay control circuit, drive circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020232894.8U CN211481491U (en) | 2020-02-28 | 2020-02-28 | Relay control circuit, drive circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211481491U true CN211481491U (en) | 2020-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020232894.8U Active CN211481491U (en) | 2020-02-28 | 2020-02-28 | Relay control circuit, drive circuit and electrical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211481491U (en) |
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2020
- 2020-02-28 CN CN202020232894.8U patent/CN211481491U/en active Active
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