Protective circuit of power supplier

A power supply and protection circuit technology, which is applied to emergency protection circuit devices, electrical components, etc., can solve problems such as cost increase and circuit complexity, and achieve the effect of reducing circuit costs

Active Publication Date: 2014-02-19
INFINNO TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] It can be seen from the above that although the protection circuit in the second figure depends on the working state of the primary side and the output voltage V OUT The state of the power supply can be accurately judged, but since the way to provide the working state of the primary side is to use an optocoupler or use a forward transformer output to transmit the signal, an additional circuit is required to achieve it, so that the circuit is more complicated, and increase in cost

Method used

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Embodiment Construction

[0080] In order to make the structural features of the present invention and the achieved effects have a further understanding and recognition, preferred embodiments and detailed descriptions are specially used, which are described as follows:

[0081] see image 3 , which is a circuit diagram of the power supply according to the first embodiment of the present invention. As shown in the figure, the power supply 10 of the present invention includes a bridge rectifier 101, a plurality of capacitors 102, 110, an inductor 109, a power transistor 104, a resistor 105, a plurality of diodes 107, 108, and a controller 106 And a transformer 103 having a primary side and a secondary side. The primary side includes a primary winding N P , the secondary side includes a secondary side winding N S . One end of the capacitor 102 is coupled to an output end of the bridge rectifier 101 and the primary side winding N P One end of the capacitor 102 is coupled to a ground end. The bridge r...

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PUM

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Abstract

The invention relates to a protective circuit of a power supplier. The protective circuit comprises a comparison circuit used for outputting a first control signal and a second control signal based on a first reference voltage, a second reference voltage and an output voltage of a power supplier; a charging circuit used for generating a charging voltage based on the first control signal; and a logic circuit used for outputting a protective signal based on the second control signal and the charging voltage so that the power supplier is shut off. The protective circuit detects the decrease speed of the output voltage of the power supplier to determine that the power supplier is in a short circuit state or an instantaneous AC cut-off state, such that the power supplier can be protected in the short circuit state and is not protected in the instantaneous AC cut-off state. Therefore, an extra circuit is not needed to detect working conditions at a primary side of the power supplier, so that costs are reduced.

Description

technical field [0001] The invention is a protection circuit, especially a protection circuit of a power supply. Background technique [0002] The power supply is used to provide the power required for the operation of the electronic device. Generally, power supplies have protection functions to protect the power supply and electronic devices. The protection functions of a general power supply include over-voltage protection, low-voltage protection, short-circuit protection, and overload protection. When the power supply is abnormal, the protection mechanism of the power supply will stop the operation of the power supply. A general protection circuit will detect the voltage level of the output voltage of the power supply, and if the output voltage is too low, it will consider the state of the power supply as a short circuit state, and then disable the power supply. However, when the input AC power of the power supply is cut off instantaneously, it will also cause the outp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/10
Inventor 杨慧聪
Owner INFINNO TECH CORP
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