Positive bias high-end current detection circuit and electrical equipment applying same

Abstract

The invention discloses a positive bias high-end current detection circuit and electrical equipment using the same. The circuit comprises a current transformer sampling module for isolating and sampling a high-end current, and a positive bias detection module for carrying out the positive bias output of the high-end current sampled by the current transformer sampling module. The current transformer sampling module is electrically connected with the positive bias detection module. According to the positive bias high-end current detection circuit, high-end current is isolated and sampled throughthe current transformer sampling module, and positive bias output detection is carried out on the high-end current sampled by the current transformer sampling module through the positive bias detection module, so that a single-resistor low-end current sampling mode is abandoned, the sampling inaccuracy caused by ground potential fluctuation is avoided, the sampling current distortion is reduced,the output uncertainty when the load is zero is avoided, the cost is low, the accuracy is high, and the product reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of current detection, and in particular relates to a positive bias high-end current detection circuit and electrical equipment using the same. Background technique [0002] Regarding the current detection circuit in the market, the method of "sampling the voltage with a series resistor" is generally adopted to obtain the instantaneous current of the relevant load. [0003] However, this kind of current detection circuit has risk problems such as inaccurate sampling due to fluctuations in the sampling voltage and low sampling resolution due to too small voltage drop on the sampling resistor when the load is light. Raising the limit while ignoring the innovation and improvement of this part of the application directly leads to objective phenomena such as low product reliability, high development process costs, and brand quality decline. Contents of the invention [0004] In order to solve the above problems...

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Problems solved by technology

[0003] However, this kind of current detection circuit has risk problems such as inaccurate sampling due to fluctuations in the sampling voltage and low sampling resolution due to too small voltage drop on the sampling resistor when the load is light. Raising the limit while ignoring the innovation and improvement of this part of the application directly leads to objective phenomena such as low product reliability, high development process costs, and brand quality decline.

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