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Protective device of equipment power source interface circuit

A power interface and circuit protection technology, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve problems such as equipment damage

Inactive Publication Date: 2014-01-29
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a device power interface circuit protection device for the problem of equipment damage due to surge voltage

Method used

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  • Protective device of equipment power source interface circuit
  • Protective device of equipment power source interface circuit
  • Protective device of equipment power source interface circuit

Examples

Experimental program
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Embodiment Construction

[0014] The following describes in detail various embodiments of the device power supply interface circuit protection device of the present invention.

[0015] Such as figure 1 As shown, it is a schematic structural diagram of Embodiment 1 of the device power interface circuit protection device of the present invention, including: a voltage detection control circuit 110, a current limiter 120 and a shunt 130;

[0016] The input terminal of the current limiter 120 is connected to the equipment voltage input terminal, the output terminal of the current limiter 120 is respectively connected to the voltage detection control circuit 110 and the equipment voltage output terminal, and the voltage detection control circuit 110 is respectively connected to the shunt 130, the equipment voltage output terminal, and ground terminal, and the shunt 130 is respectively connected to the device voltage output terminal and the ground terminal. Of course, one end of the device power interface ci...

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Abstract

Disclosed is a protective device of an equipment power source interface circuit. The protective device of the equipment power source interface circuit comprises a voltage detection control circuit, a current limiter and a current divider. The input end of the current limiter is connected with an equipment voltage input end. The output end of the current limiter is respectively connected with the voltage detection control circuit and an equipment voltage output end. The voltage detection control circuit is respectively connected with the current divider, the equipment voltage output end and a ground terminal. The current divider is respectively connected with the equipment voltage output end and the ground terminal. The voltage detection control circuit is used for controlling the current divider to reduce an output voltage value of the equipment voltage output end to be a second preset voltage value when an input voltage value is larger than a first preset voltage value. According to the protective device of the equipment power source interface circuit, damage, caused when equipment is charged by an external DC power source or is in the working process with the external power source, to the equipment power source interface circuit is prevented, and damage, caused when main equipment supplies power to external equipment through a USB interface or a DC interface, to a main equipment power source interface circuit can also be prevented.

Description

technical field [0001] The invention relates to the technical field of equipment maintenance, in particular to a device power supply interface circuit protection device. Background technique [0002] Due to the small size of electronic devices such as mobile phones and tablet computers, the capacity of the internal integrated battery is limited, and it must be charged by an external DC power supply or work with an external power supply from time to time. However, due to the variety of external power supplies, it is easy to cause improper voltage access. There is an instantaneous surge voltage during the hot swapping process, causing equipment damage or more serious safety accidents. In addition, many electronic devices can supply power to external devices through a USB interface or a DC interface, such as supplying power to the outside through a computer. However, if there is a fault such as a short circuit in the external device, it will seriously affect the power supply o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H02H9/02
Inventor 周冬生聂永智张耀林
Owner GUANGDONG VTRON TECH CO LTD
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