Relay driving circuit

Abstract

The utility model discloses a relay driving circuit, belongs to the field of electrical control, and solves the problem that the service life of a relay is affected due to frequent actuation and disconnection operations of the relay in the prior art. In the application, a relay driving circuit is electrically connected with an action coil and a reset coil of a relay; the relay driving circuit comprises a power supply circuit, an actuating coil circuit and a reset coil circuit; anodes of the actuating coil and the reset coil are connected with a direct-current power supply through a power circuit; the actuating coil circuit comprises a switch end T1 of the power switch chip, and the cathode of the actuating coil is grounded through the switch end T1 of the power switch chip; the reset coil circuit comprises a switch end T2 of the power switch chip, and the negative electrode of the reset coil is grounded through the switch end T2 of the power switch chip. According to the relay driving circuit, through a simple circuit structure, the control chip drives the relay to be closed and opened, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to a relay driving circuit and belongs to the field of electrical control. Background Art

[0002] As a common electrical control component, relays are widely used in control circuits. Relays are generally composed of an iron core, a coil, an armature, and a contact spring. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect. The armature will overcome the pulling force of the return spring under the action of the electromagnetic force and be attracted to the iron core, thereby driving the moving contact of the armature to close with the static contact (normally open contact). When the coil is powered off, the electromagnetic attraction disappears, and the armature returns to its original position under the reaction force of the spring, causing the moving contact to close with the original static contact (normally closed contact). In this way, the attraction and release achieve the purpose of conduction and disconnection in the circuit.

[0003] Relays are used to control large currents with smaller currents, thereby automatically connecting and disconnecting the circuit. The normally closed or normally open state of the relay is completely dependent on the action of the permanent magnet. However, in actual use, due to the frequent closing and disconnecting operations of the relay, the relay coil is easily burned, which will inevitably affect the service life of the relay. Utility Model Content

[0004] The utility model provides a relay driving circuit, which realizes the closing and opening of a control chip driving a relay through a simple circuit structure.

[0005] The technical solution adopted by the utility model is a relay driving circuit, comprising a relay, the relay having an action coil and a reset coil, and the relay driving circuit is electrically connected to the action coil and the reset coil of the relay;

[0006] The relay driving circuit includes a power supply circuit, an action coil circuit and a reset coil circuit;

[0007] The positive electrodes of the action coil and the reset coil are connected to a DC power supply through a power circuit;

[0008] The action coil circuit includes a switch terminal T1 of a power switch chip, and the negative electrode of the action coil is grounded through the switch terminal T1 of the power switch chip;

[0009] The reset coil circuit includes a switch terminal T2 of a power switch chip, and a negative electrode of the reset coil is grounded through the switch terminal T2 of the power switch chip.

[0010] Optimized, the above relay drive circuit, the power supply circuit includes a resistor R3, the positive electrodes of the action coil and the reset coil are connected in series with resistor R3 and then connected to a 12V DC power supply.

[0011] Optimally, in the relay drive circuit, the switch terminal T1 and the switch terminal T2 are two switch terminals of the same power switch chip;

[0012] Or the switch end T1 and the switch end T2 are switch ends of two power switch chips respectively.

[0013] Optimally, in the above relay driving circuit, the action coil circuit further includes a capacitor C1, and the capacitor C1 is connected in parallel to both ends of the switch terminal T1 of the power switch chip.

[0014] Optimized, the above relay drive circuit, the action coil circuit also includes a resistor R1 and a resistor R2, the resistor R1 is connected in series to the switch signal input end of the switch end T1 of the power switch chip; the switch end T1 of the power switch chip and the resistor R1 are grounded through the resistor R2.

[0015] Optimally, in the above relay drive circuit, the reset coil circuit further includes a second capacitor C2, and the second capacitor C2 is connected in parallel to both ends of the switch terminal T2 of the power switch chip.

[0016] Optimized, the above-mentioned relay drive circuit, the reset coil circuit also includes a resistor four R4 and a resistor five R5, the resistor four R4 is connected in series to the switch signal input end of the switch end T2 of the power switch chip; the switch end T2 of the power switch chip and the resistor four R4 are grounded through the resistor five R5.

[0017] The advantages of the present application are: through a simple circuit structure, the control chip drives the relay to close and open, the relay is protected, the control is simple, and the drive circuit is simple and easy to implement.

[0018] The coil of a conventional electromagnetic relay needs to be powered on continuously to remain closed or disconnected, but a magnetic latching relay does not require continuous power supply to maintain the switch state. It only needs to apply a certain pulse signal to the coil, which can effectively drive the switch circuit and achieve a certain energy saving purpose. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of this application. DETAILED DESCRIPTION

[0020] The technical features of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] As shown in the figure, the utility model is a relay driving circuit, comprising a relay, wherein the relay has an action coil and a reset coil, and the relay driving circuit is electrically connected to the action coil and the reset coil of the relay.

[0022] In the present application, the relay driving circuit is divided into a power supply circuit, an action coil circuit and a reset coil circuit.

[0023] The positive poles of the action coil and the reset coil (relay power supply terminal P3) are connected to the DC power supply through the power supply circuit. The power supply circuit includes a resistor R3. The positive poles of the action coil and the reset coil are connected in series with the resistor R3 and then connected to the 12V DC power supply.

[0024] The action coil circuit includes the switch terminal T1 of the power switch chip, capacitor C1, resistor R1 and resistor R2, and the negative electrode P4 of the action coil is grounded through the switch terminal T1 of the power switch chip. Capacitor C1 is connected in parallel to both ends of the switch terminal T1 of the power switch chip. Resistor R1 is connected in series to the switch signal input end of the switch terminal T1 of the power switch chip; the switch terminal T1 of the power switch chip and resistor R1 are grounded through resistor R2.

[0025] The reset coil circuit includes the switch terminal T2 of the power switch chip, the capacitor C2, the resistor R4 and the resistor R5, and the negative electrode P5 of the reset coil is grounded through the switch terminal T2 of the power switch chip. The capacitor C2 is connected in parallel to both ends of the switch terminal T2 of the power switch chip. The resistor R4 is connected in series to the switch signal input end of the switch terminal T2 of the power switch chip; the switch terminal T2 of the power switch chip and the resistor R4 are grounded through the resistor R5.

[0026] In this embodiment, the switch terminal T1 and the switch terminal T2 are two switch terminals of the same power switch chip. Another option is that the switch terminal T1 and the switch terminal T2 are switch terminals of two power switch chips respectively.

[0027] The working process of the present application is as follows: when the closing pulse signal P1 of the control chip is sent to the switch terminal T1 of the power switch chip, the switch terminal T1 of the power switch chip is closed and turned on, the negative pole of the relay action coil is connected to the ground, a voltage is generated at both ends of the relay coil, and the contacts of the relay are closed.

[0028] When the disconnect pulse signal P2 of the control chip is sent to the switch terminal T2 of the power switch chip, the switch terminal T2 of the power switch chip is closed and turned on, the negative pole of the relay reset coil is connected to the ground, and voltage is generated at both ends of the coil. At this time, the contacts of the relay are disconnected. The control chip controls the driving relay to realize its on and off.

[0029] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. A relay drive circuit, comprising a relay, wherein the relay has an action coil and a reset coil, and the relay drive circuit is electrically connected to the action coil and the reset coil of the relay; characterized in that: The relay driving circuit includes a power supply circuit, an action coil circuit and a reset coil circuit; The positive electrodes of the action coil and the reset coil are connected to a DC power supply through a power circuit; The action coil circuit includes a switch terminal T1 of a power switch chip, and the negative electrode of the action coil is grounded through the switch terminal T1 of the power switch chip; The reset coil circuit includes a switch terminal T2 of a power switch chip, and a negative electrode of the reset coil is grounded through the switch terminal T2 of the power switch chip.

2. The relay drive circuit according to claim 1, characterized in that: The power supply circuit includes a resistor R3, and the positive electrodes of the action coil and the reset coil are connected in series with the resistor R3 and then connected to a 12V DC power supply.

3. The relay drive circuit according to claim 1, characterized in that: The switch terminal T1 and the switch terminal T2 are two switch terminals of the same power switch chip; Or the switch end T1 and the switch end T2 are switch ends of two power switch chips respectively.

4. The relay driving circuit according to claim 1, characterized in that: The action coil circuit further includes a capacitor C1, which is connected in parallel to two ends of a switch terminal T1 of a power switch chip.

5. The relay driving circuit according to claim 1, characterized in that: The action coil circuit also includes a resistor R1 and a resistor R2. The resistor R1 is connected in series to a switch signal input terminal of a switch terminal T1 of a power switch chip. The switch terminal T1 of the power switch chip and the resistor R1 are grounded through the resistor R2.

6. The relay drive circuit according to claim 5, characterized in that: The reset coil circuit further includes a second capacitor C2, and the second capacitor C2 is connected in parallel to two ends of the switch terminal T2 of the power switch chip.

7. The relay drive circuit according to claim 5, characterized in that: The reset coil circuit also includes a resistor four R4 and a resistor five R5, wherein the resistor four R4 is connected in series to a switch signal input terminal of a switch terminal T2 of a power switch chip; the switch terminal T2 of the power switch chip and the resistor four R4 are grounded through the resistor five R5.

Images