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A relay control circuit and relay

A relay control and control circuit technology, applied in relays, circuits, electrical components, etc., can solve the problems of high current in relay coils, small voltage variable range, and waste of energy in power, so as to achieve precise control of output current and avoid serious heat generation. The effect of reducing power

Active Publication Date: 2022-07-22
XIAMEN HUALIAN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing relay control circuit uses a fixed voltage power supply. In order to achieve pull-in, the fixed voltage is relatively high, and the resistance of the relay coil is usually constant. After pull-in, the relay coil will always maintain a large current , and its defects are: 1. The relay generates serious heat, which affects reliability; 2. The relay coil maintains a large current, and the power is high, wasting energy; 3. The output current is uncontrollable; 4. The input voltage is fixed, and the voltage variable range is small

Method used

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  • A relay control circuit and relay
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Embodiment 1

[0026] like figure 1 As shown, a relay control circuit includes a power conversion module 1, a single square wave trigger circuit 2, an operational amplifier control circuit 3 and a current sampling circuit 4, and the output ends Coil1 and Coil2 of the power conversion module 1 are used to connect the relay coil ( (not shown in the figure), power supply for the relay coil, the current sampling circuit 4 is used to sample the current size flowing through the relay coil, and is converted into a voltage size for output, the output terminal of the single square wave trigger circuit 2 and the current sampling The output terminals of circuit 4 are respectively connected to the two input terminals of the operational amplifier control circuit 3. The output terminal of the operational amplifier control circuit 3 is connected to the feedback pin VSNS of the power conversion module 1. The operational amplifier control circuit 3 is used for triggering a single square wave. The output sign...

Embodiment 2

[0041] like figure 2 As shown, the difference between this specific embodiment and the first embodiment is that this embodiment further includes a disconnecting circuit 5, which is serially arranged in the loop of the relay coil and is configured to Disconnect circuit 5 is turned off.

[0042] In this specific embodiment, the disconnecting circuit 5 is realized by using the NMOS transistor Q1, including the NMOS transistor Q1, the resistor R1, the resistor R3 and the voltage regulator ZD1. For details on the circuit connection relationship, please refer to figure 2 , this will not go into detail. By using the disconnecting circuit 5, the sensitivity is high and the energy consumption is low, but it is not limited to this. In other embodiments, other switching circuits can also be used to implement.

[0043] In this specific embodiment, the disconnecting circuit 5 is provided with an RC absorption loop, which includes a capacitor C2 and a resistor R2, and the capacitor C2 a...

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Abstract

The invention discloses a relay control circuit and a relay. The relay control circuit includes a power conversion module, a single square wave trigger circuit, an operational amplifier control circuit and a current sampling circuit. The output end of the power conversion module is connected to a relay coil, and the current sampling circuit is used for sampling The magnitude of the current flowing through the relay coil, the output end of the single square wave trigger circuit and the output end of the current sampling circuit are respectively connected to the two input ends of the op amp control circuit, the output end of the op amp control circuit is connected to the feedback pin of the power conversion module, the op amp The control circuit is used to perform the following operations on the output signal of the single square wave trigger circuit and the sampling signal of the current sampling circuit and output: V OUT =k 1 V s ‑k 2 V in . The invention has the advantages of avoiding serious heating of the relay, high reliability, low power, energy saving, precise control of output current, high reliability, wide voltage input, and can cope with various complex environments.

Description

technical field [0001] The invention belongs to the technical field of relays, and in particular relates to a relay control circuit and a relay. Background technique [0002] Relay is an automatic switching element with isolation function. It is widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronic equipment. It is one of the most important control elements. [0003] According to the load of the relay, it can be divided into micro power relay, weak power relay, medium power relay and high power relay. High-power relays require a large voltage or current at the moment of pull-in, but the holding current required after pull-in does not need to be large. However, the existing relay control circuit is powered by a fixed voltage. In order to achieve pull-in, the fixed voltage is relatively high, and the resistance of the relay coil is usually unchanged. After the pull-in, the relay coil will always maintain a large current....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H47/02H01H47/32
CPCH01H47/02H01H47/32H01H2047/025
Inventor 吴文勇张志军钟天禄
Owner XIAMEN HUALIAN ELECTRONICS CO LTD