CN210156316U - Novel magnetic latching relay drive circuit - Google Patents
Novel magnetic latching relay drive circuit Download PDFInfo
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- CN210156316U CN210156316U CN201920544527.9U CN201920544527U CN210156316U CN 210156316 U CN210156316 U CN 210156316U CN 201920544527 U CN201920544527 U CN 201920544527U CN 210156316 U CN210156316 U CN 210156316U
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Abstract
The utility model relates to a novel magnetic latching relay drive circuit, its characterized in that: the device comprises an MCU control module, a power supply module, a switch circuit module and a capacitor CE 1; the control end of the switch circuit module is connected with one output end of the MCU control module, one pole of the capacitor CE1 is connected with the output end of the switch circuit module, the other pole of the capacitor CE1 is connected with the control end QA of the magnetic latching relay, the power supply module is connected with the input end of the switch circuit module, and the switch circuit module controls the on-off of the power supply module and the capacitor CE 1. The circuit structure of the driving circuit is simple, only one I/O port of the MCU is occupied, software resources are saved, programs are simplified, and cost is saved.
Description
Technical Field
The utility model relates to a relay technical field especially relates to a novel magnetic latching relay drive circuit.
Background
Most of the existing magnetic latching relay driving circuits control the driving chip through two I/O ports of the MCU, so as to control the on-off of the magnetic latching relay, as shown in FIG. 2. The drive circuit of the magnetic latching relay needs to occupy two I/O ports of an MCU, the control program is complex, software resources are wasted, and a drive chip is needed, so that the circuit is complex and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of the above, an object of the present invention is to provide a novel magnetic latching relay driving circuit with simple circuit design, low cost and convenient control.
In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides a novel magnetic latching relay drive circuit which characterized in that:
the device comprises an MCU control module, a power supply module, a switch circuit module and a capacitor CE 1;
the control end of the switch circuit module is connected with one output end of the MCU control module, one pole of the capacitor CE1 is connected with the output end of the switch circuit module, the other pole of the capacitor CE1 is connected with the control end QA of the magnetic latching relay, the power supply module is connected with the input end of the switch circuit module, and the switch circuit module controls the on-off of the power supply module and the capacitor CE 1.
Further, the switch circuit module comprises a first switch module and a second switch module; the second switch module is arranged between the power supply module and the capacitor CE1 to control the on-off of the power supply module and the capacitor CE1, the control end of the second switch module is connected with the first switch module and provides a control signal for the on-off of the second switch module by the first switch module, and the control end of the first switch module is connected with the output end of the MCU control module and provides a control signal for the on-off of the first switch module by the MCU control module.
Further, the first switch module comprises an optical coupler E1, the anode of the light emitting diode of the optical coupler E1 is connected with the output end of the MCU control module, the cathode of the light emitting diode is grounded, and the light receiver of the optical coupler E1 is connected between the control end of the second switch module and ground.
Further, the second switch module comprises an electromagnetic relay K1, a normally open contact of the electromagnetic relay K1 is connected with the power supply module, a normally closed contact is grounded, a fixed end of the electromagnetic relay K1 is connected with a control end QA of the magnetic latching relay through a capacitor CE1, one end of a coil of the electromagnetic relay K1 is connected with the power supply module, and the other end of the coil is connected with a light receiver of the optical coupler E1.
Furthermore, a current limiting resistor R1 is connected between the anode of the light emitting diode of the optocoupler E1 and the output end of the MCU control module.
Furthermore, a first diode VD1 is connected in parallel with two ends of a coil of the electromagnetic relay K1, the anode of the first diode VD1 is connected with the other end of the coil of the electromagnetic relay K1, and the cathode of the first diode VD1 is connected with one end of the coil.
Furthermore, a second diode VD2 is connected in parallel with two ends of a light emitting diode of the optocoupler E1, the anode of the second diode VD2 is connected with the cathode of the light emitting diode of the optocoupler E1, and the cathode of the second diode VD2 is connected with the anode of the light emitting diode.
Further, a resistor R2 is connected between a light emitting diode of the optical coupler E1 and the ground in series.
Further, the power module is a 12V direct current power supply.
Compared with the prior art, the utility model has the advantages of: the drive circuit has a simple structure, does not need a drive chip, can realize on-off control of the magnetic latching relay by occupying at most one I/O port of the MCU, is convenient to control, simplifies the program and saves software resources; the driving circuit can be realized only by simple electronic components such as a resistor, a diode, an optocoupler and the like, the circuit is simple, the cost is saved, the PCB layout space is saved, and the single-board design of a single-surface patch single-surface plug-in is conveniently realized.
Drawings
Fig. 1 is a circuit diagram of an embodiment of the novel magnetic latching relay driving circuit of the present invention.
Fig. 2 is a block diagram of the overall structure of the novel magnetic latching relay driving circuit of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1-2, the preferred embodiment of the novel magnetic latching relay driving circuit of the present invention is shown, and as shown in the figure, the magnetic latching relay driving circuit includes an MCU control module, a power module, a switching circuit module and a capacitor CE 1; the control end of the switch circuit module is connected with one output end of the MCU control module, one pole of the capacitor CE1 is connected with the output end of the switch circuit module, the other pole of the capacitor CE1 is connected with the control end QA of the magnetic latching relay, the power supply module is connected with the input end of the switch circuit module, and the switch circuit module controls the on-off of the power supply module and the capacitor CE 1. In this embodiment, the power supply module includes a 12V dc power supply whose on/off is controlled by a front-end circuit. The MCU control module outputs an on-off control signal to the switch circuit module to control the on-off of the switch circuit module, the on-off of the switch circuit module enables a capacitor CE1 connected with the switch circuit module to be charged and discharged, and positive and negative pulses are provided for a magnetic latching relay control end QA by utilizing the charge-discharge characteristics of a capacitor CE1, so that the magnetic latching relay is switched on or off.
In this embodiment, the switch circuit module includes a first switch module 1 and a second switch module 2; the second switch module 1 is arranged between the power supply module and the capacitor CE1 to control the on-off of the power supply module and the capacitor CE1, the control end of the second switch module 2 is connected with the first switch module 1 and the first switch module 1 provides a control signal for controlling the on-off of the second switch module 2, and the control end of the first switch module 1 is connected with the output end of the MCU control module and the MCU control module provides a control signal for controlling the on-off of the first switch module 1.
Specifically, the first switch module 1 includes an optocoupler E1, an anode of a light emitting diode of the optocoupler E1 is connected to the one output end of the MCU control module, a cathode of the light emitting diode is grounded, and a light receiver of the optocoupler E1 is connected between the control end of the second switch module 2 and ground; the second switch module 2 comprises an electromagnetic relay K1, a normally open contact of the electromagnetic relay K1 is connected with a power supply module, a normally closed contact is grounded, a fixed end of the electromagnetic relay K1 is connected with a control end QA of a magnetic latching relay through a capacitor CE1, one end of a coil of the electromagnetic relay K1 is connected with the power supply module, and the other end of the coil is connected with a light receiver of the optical coupler E1.
In this embodiment, a current limiting resistor R1 is connected between the anode of the light emitting diode of the optocoupler E1 and the output end of the MCU control module to prevent the optocoupler from being damaged by excessive current.
In this embodiment, a first diode VD1 is connected in parallel with two ends of the coil of the electromagnetic relay K1, the anode of the first diode VD1 is connected with the other end of the coil of the electromagnetic relay K1, and the cathode of the first diode VD1 is connected with the one end of the coil. The parallel connection of the first diode VD1 can prevent the damage of large current to the electronic device at the moment of power failure of the coil.
In this embodiment, two ends of a light emitting diode of the optocoupler E1 are connected in parallel with a second diode VD2, an anode of the second diode VD2 is connected with a cathode of a light emitting diode of the optocoupler E1, a cathode of the second diode VD2 is connected with an anode of the light emitting diode, and a resistor R2 is further connected in series between the light emitting diode and the ground. The optocoupler E1 can be protected by the second diode VD2 connected in parallel, and the fact that the optocoupler E1 is damaged due to reverse voltage breakdown of the light emitting diode is prevented.
In the embodiment, the resistances of the resistor R1 and the resistor R2 are both 5.1K omega, the model of the first diode VD1 is RB160M-60TR, the model of the second diode is 1N4148, the model of the optocoupler E1 is LTV-816S-TP-D3-TXCU, the model of the electromagnetic relay is JQX118F-1ZS1, and the size of the capacitor CE1 is 2200 uF.
The utility model discloses a drive circuit's theory of operation does:
when an output end DI + of the MCU control module applies a forward electric signal to the optocoupler E1, E1 is conducted, a coil of the electromagnetic relay K1 is electrified, a normally open contact is closed, the capacitor CE1 is charged, the potential at two ends of the capacitor CE1 at the moment of electrification is 12V by utilizing the characteristic of the instantaneous potential of the capacitor, and a forward pulse, namely a high-level signal is generated to conduct the magnetic latching relay; when a negative electric signal is applied to the optocoupler E1 by the output end DI + of the MCU control module, the E1 is cut off, the K1 coil is powered off, the normally open contact is disconnected, the potential of the other electrode of the capacitor CE1 jumps instantaneously to-12V, and the potential of the QA control end of the magnetic latching relay correspondingly changes to-12V, so that a negative pulse, namely a low-level signal, is generated in the discharging process, and the magnetic latching relay is disconnected. Thus, the magnetic latching relay is driven to be switched on and off.
In addition to the above-mentioned modifications, other similar modifications are also included in the scope of the present invention, and are not described herein in detail. While embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. The utility model provides a novel magnetic latching relay drive circuit which characterized in that:
the device comprises an MCU control module, a power supply module, a switch circuit module and a capacitor CE 1;
the control end of the switch circuit module is connected with one output end of the MCU control module, one pole of the capacitor CE1 is connected with the output end of the switch circuit module, the other pole of the capacitor CE1 is connected with the control end QA of the magnetic latching relay, the power supply module is connected with the input end of the switch circuit module, and the switch circuit module controls the on-off of the power supply module and the capacitor CE 1.
2. The driving circuit according to claim 1, wherein:
the switch circuit module comprises a first switch module (1) and a second switch module (2); the second switch module (2) is arranged between the power supply module and the capacitor CE1 to control the on-off of the power supply module and the capacitor CE1, the control end of the second switch module (2) is connected with the first switch module (1) and provides a control signal for the on-off of the second switch module (2) through the first switch module (1), and the control end of the first switch module (1) is connected with the output end of the MCU control module and provides a control signal for the on-off of the first switch module (1) through the MCU control module.
3. The driving circuit according to claim 2, wherein:
the first switch module (1) comprises an optical coupler E1, the anode of a light emitting diode of the optical coupler E1 is connected with the output end of the MCU control module, the cathode of the light emitting diode is grounded, and a light receiver of the optical coupler E1 is connected between the control end of the second switch module (2) and the ground.
4. The driving circuit according to claim 3, wherein:
the second switch module (2) comprises an electromagnetic relay K1, a normally open contact of the electromagnetic relay K1 is connected with the power supply module, a normally closed contact is grounded, a fixed end of the electromagnetic relay K1 is connected with a control end QA of the magnetic latching relay through a capacitor CE1, one end of a coil of the electromagnetic relay K1 is connected with the power supply module, and the other end of the coil is connected with a light receiver of the optical coupler E1.
5. The driving circuit according to claim 3, wherein:
and a current-limiting resistor R1 is connected between the anode of the light-emitting diode of the optocoupler E1 and the output end of the MCU control module.
6. The driving circuit according to claim 4, wherein:
the coil both ends of electromagnetic relay K1 have first diode VD1 in parallel, the positive pole of first diode VD1 and electromagnetic relay K1's the other end is connected, first diode VD 1's negative pole and coil one end is connected.
7. The driving circuit according to claim 3, wherein:
the two ends of a light emitting diode of the optical coupler E1 are connected with a second diode VD2 in parallel, the anode of the second diode VD2 is connected with the cathode of the light emitting diode of the optical coupler E1, and the cathode of the second diode VD2 is connected with the anode of the light emitting diode.
8. The driving circuit according to claim 3, wherein:
and a resistor R2 is also connected between the light emitting diode of the optical coupler E1 and the ground in series.
9. The driving circuit according to claim 1, wherein:
the power supply module is a 12V direct-current power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920544527.9U CN210156316U (en) | 2019-04-19 | 2019-04-19 | Novel magnetic latching relay drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920544527.9U CN210156316U (en) | 2019-04-19 | 2019-04-19 | Novel magnetic latching relay drive circuit |
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| CN210156316U true CN210156316U (en) | 2020-03-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022077974A1 (en) * | 2020-10-16 | 2022-04-21 | 珠海格力电器股份有限公司 | Circuit system, control method of circuit system, controller and storage medium |
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2019
- 2019-04-19 CN CN201920544527.9U patent/CN210156316U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022077974A1 (en) * | 2020-10-16 | 2022-04-21 | 珠海格力电器股份有限公司 | Circuit system, control method of circuit system, controller and storage medium |
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