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Dual-bus dual-power-tube current-limiting circuit, chip and electronic device

A technology of current-limiting circuits and electronic equipment, applied in the field of circuits, can solve the problems of low reliability and high cost of current-limiting protection, and achieve the effects of cost reduction, reliability improvement, and phase deviation avoidance

Active Publication Date: 2019-05-31
ZHANGZHOU KEHUA ELECTRIC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the embodiment of the present invention provides a dual-bus dual-power tube current-limiting circuit, chip and electronic equipment to solve the problem of high cost and reliable current-limiting protection of dual-bus dual-power tube current-limiting protection in the prior art. lower sex problems

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  • Dual-bus dual-power-tube current-limiting circuit, chip and electronic device
  • Dual-bus dual-power-tube current-limiting circuit, chip and electronic device
  • Dual-bus dual-power-tube current-limiting circuit, chip and electronic device

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Embodiment Construction

[0028] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0029] In order to illustrate the technical solutions of the present invention, specific examples are used below to illustrate.

[0030] The embodiment of the present invention provides a dual-bus dual-power tube current limiting circuit, such as figure 1 As shown, the current-limiting circuit with dual busbars and dual power transistors may include a first power resistor R1, a second power resis...

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Abstract

The invention belongs to the technical field of circuits and provides a dual-bus dual-power-tube current-limiting circuit, a chip and an electronic device. The dual-bus dual-power-tube current-limiting circuit comprises a first power resistor, a second power resistor, a pull-up resistor, a first triode, a second triode, a third triode, and a controller. According to the dual-bus dual-power-tube current-limiting circuit, the chip and the electronic device provided by the embodiment of the invention, by means of the voltage drops generated by the two power resistors when the two external power tubes are turned on, the first triode or the second triode is turned on such that the third triode is turned on. Thus, a high-level signal is input into the feedback signal input end of the controller,so that the controller, by controlling the duty ratio of a rectangular wave driving signal output by itself, achieves current-limiting protection of the two external power tubes.

Description

technical field [0001] The invention belongs to the technical field of circuits, and in particular relates to a current-limiting circuit with dual busbars and dual power tubes, chips and electronic equipment. Background technique [0002] In a common current limiting circuit with dual busbars and dual power tubes, current sampling is required, and current sampling often uses transformers, or the method of combining resistors and transformers for current sampling. The cost of the transformer sampling circuit is relatively high, and the circuit structure is relatively cumbersome, and there is a phase deviation between the transformer and the resistance sampling in the sampling circuit where the resistance and the transformer are used together. The current limiting protection of the power tube causes interference, which reduces the reliability of the current limiting protection to a certain extent. Contents of the invention [0003] In view of this, the embodiment of the pre...

Claims

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Application Information

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IPC IPC(8): H02H9/02
Inventor 陈坤裕李育刚
Owner ZHANGZHOU KEHUA ELECTRIC TECH CO LTD
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