Power conversion device and overcurrent protection method thereof

A power conversion and overcurrent technology, which is used in output power conversion devices, emergency protection circuit devices, and conversion of AC power input to DC power output.

Inactive Publication Date: 2014-02-05
POWER FOREST TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of this, the present invention proposes a power conversion device and its over-current protection method using a variable-slope over-current protection reference signal to determine whether to activate the over-current protection mechanism, so as to solve the problems mentioned in the prior art

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  • Power conversion device and overcurrent protection method thereof
  • Power conversion device and overcurrent protection method thereof
  • Power conversion device and overcurrent protection method thereof

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Embodiment Construction

[0045] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements / members using the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0046] image 3 It is a schematic diagram of a power conversion device 30 according to an embodiment of the present invention. Please refer to image 3 , the power conversion apparatus (powerconversionapparatus) 30 can be applied in the occasion of wide range AC input (widerangeACinput), such as 90V ~ 264V AC input voltage, but not limited thereto, and it includes a transformer (transformer) T, a power switch ( powerswitch) Q, resistor (resistor) Rs, feedback unit (feedback unit) 301, pulse width modulation control chip (PWMcontrolchip) 303, diode (diode) D, and capacitor (capacitor) C.

[0047] In this embodiment, the transformer T has a primary side (primaryside) P and a secondary s...

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Abstract

The invention provides a power conversion device and an overcurrent protection method thereof. The overcurrent protection method comprises the following steps of: generating a pulse width modulation signal according to a load state of an electronic device, so as to switch a power switch in the power conversion device, so that the power conversion device supplies an output voltage to the electronic device; generating a variable slope overcurrent protection reference signal according to a feedback signal associated with the load state of the electronic device and a system operation voltage of a pulse width modulation control chip for generating a pulse width modulation signal in the power conversion device; and comparing a detecting voltage of current flowing through the power switch, reflected on a resistor, with the variable slope overcurrent protection reference signal so as to determine whether to start an overcurrent protection mechanism to control whether the pulse width modulation control chip generates the pulse width modulation signal.

Description

technical field [0001] The present invention relates to a power conversion device, in particular to a power conversion device using a variable slope over-current protection reference signal to determine whether to activate the over-current protection mechanism. Background technique [0002] The main purpose of the power conversion apparatus is to convert the high-voltage and low-stability AC input voltage (ACinput voltage) provided by the power company into a low-voltage and stable DC output voltage suitable for various electronic devices (electronic devices). (DC output voltage). Therefore, the power conversion device is widely used in electronic devices such as computers, office automation equipment, industrial control equipment, and communication equipment. [0003] figure 1 It is a schematic diagram of a conventional power conversion device 10 . Please refer to figure 1 , generally speaking, the pulse width modulation signal generator (PWMsignalgenerator) 103 in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02H7/125
Inventor 许智雄贾儒林
Owner POWER FOREST TECH
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