Surge voltage and current protective device

A surge voltage and current protection technology, which is applied in the protection of overcurrent and overvoltage, etc., can solve the problems of high cost and complicated circuit, improve circuit reliability and save hardware resources. , The effect of reducing circuit cost

Inactive Publication Date: 2011-04-13
SHENZHEN H&T INTELLIGENT CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The disadvantage of the above method is: the circuit is more compl

Method used

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Embodiment Construction

[0027] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] refer to figure 2 , an embodiment of a surge voltage and current protection device of the present invention is proposed. In this embodiment, the surge voltage and current protection device is connected to the working circuit of the electrical equipment to protect the surge voltage and current. The above-mentioned devices include:

[0029] The voltage detection circuit 21 performs voltage sampling on the working circuit of the electrical equipment to obtain sampling data;

[0030] The current detection circuit 22 performs current sampling on the working circuit of the electrical equipment to obtain sampling data;

[0031] A reference setting circuit 23, which sets a reference voltage or a reference current;

[0032] The control circuit 24 compares the acquired sampling data with the reference voltage or refe...

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Abstract

The invention discloses a surge voltage and current protective device, which is connected with a working circuit of electrical equipment for protecting surge voltage and current. The device comprises a voltage detection circuit, a current detection circuit, a reference setting circuit, a control circuit and the working circuit, wherein the voltage detection circuit performs voltage sampling on the working circuit of the electrical equipment to acquire sampling data; the current detection circuit performs current sampling on the working circuit of the electrical equipment to acquire sampling data; the reference setting circuit sets a reference voltage or a reference current; the control circuit respectively compares the acquired sampling data with the reference voltage or the reference current to judge whether a surge voltage or a surge current appears or not; and the working circuit switches off the electrical equipment when the surge voltage or the surge current appears. The surge voltage and current protective device protects the surge voltage and the surge current at the same time by using one comparison unit in LM339, saves hardware resource, reduces the circuit cost and improves the reliability of the circuit.

Description

technical field [0001] The invention relates to the field of surge voltage and current protection, in particular to a surge voltage and current protection device. Background technique [0002] refer to figure 1 , In the prior art, the surge voltage and surge current protection circuit of induction cooker is commonly used. Generally, the surge voltage and surge current are protected separately. It needs to use two comparison units of LM339, and then connect them to the interrupt pin of the single chip microcomputer in parallel. The LM339 has four independent voltage comparators, and various voltage comparator circuits and oscillator circuits can be easily formed by using the LM339. [0003] The disadvantage of the above method is that the circuit is more complicated, and two comparison units in the LM339 are used, and the cost is higher. Contents of the invention [0004] The main purpose of the present invention is to provide a surge voltage and current protection device...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H3/08
Inventor 伍炎军冯世荣苏勇庆
Owner SHENZHEN H&T INTELLIGENT CONTROL
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