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Relay control circuit with current detecting function

A current control circuit and relay control technology, applied in the electrical field, can solve the problems that the relay control circuit has no current feedback and the detection circuit cannot be used universally.

Inactive Publication Date: 2011-06-01
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention mainly solves the problem that the relay control circuit has no current feedback and the problem that the detection circuit under the condition of different AC and DC voltages cannot be used universally

Method used

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  • Relay control circuit with current detecting function
  • Relay control circuit with current detecting function

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Embodiment Construction

[0010] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0011] Such as figure 1 As shown, a relay control circuit with current detection function is composed of a current control circuit 1, a current sampling circuit 2, and a current signal isolation detection circuit 3. The current control circuit 1 is used to complete the on-off control of low-voltage power to high-voltage power , the current sampling circuit 2 is connected in series in the high-voltage electric circuit, the current sampling is completed through a diode, and the current signal isolation detection circuit 3 performs photoelectric isolation output on the current output by the current sampling circuit 2 through the optocoupler U1,

[0012] The current control circuit 1 mainly uses the relay K1 as the control element, and the output pin of the relay K1 is connected in series with the current sampling circuit 2; the current sampling circuit 2 i...

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Abstract

A relay control circuit with current detecting function comprises a current control circuit, a current sampling circuit and a current signal isolating and detecting circuit, wherein the current control circuit is used for controlling connection and disconnection of high-voltage current by low-voltage current, the current sampling circuit pair is connected in the high-voltage current circuit in series and samples current by diodes, and the current signal isolating and detecting circuit is used for photoelectric isolation output of current output by the current sampling circuit by an optical coupler U1; and the relay control circuit mainly solves the problems of no current feedback and non-universality of detecting circuit for alternating-current or direct-current of different voltage. The designed circuit is arranged on a pair of wiring terminals for not only being used as output for controlling other equipments, but also being used for detecting the existence of the loop current of the controlled equipments; and the power supply of the controlled equipments can be direct-current or alternating-current, and is applicable at the voltage of 24V to 220V.

Description

technical field [0001] The invention relates to a relay control circuit with a current detection function, which mainly uses a diode and an optocoupler to realize the integration of output and input detection on the same pair of terminals, and belongs to the electrical field. Background technique [0002] Relay control is a commonly used control circuit in industrial control, which can control large current and high voltage with small signal. The usual relay control circuit can only output the control signal, does not detect the controlled circuit, and cannot feedback the state of the controlled object. In the industrial field, the voltage of the object controlled by the relay is both AC and DC, and the voltage is different (24V~220V). The usual current detection circuit cannot be used universally. Contents of the invention [0003] The object of the present invention is to provide a relay control circuit with current detection function. [0004] The invention mainly sol...

Claims

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Application Information

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IPC IPC(8): H01H47/00
Inventor 胡佳文
Owner ZHEJIANG OCEAN UNIV
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