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Soft starting switch circuit and electronic apparatus

A soft-start switch and circuit technology, applied in the direction of output power conversion devices, electrical components, etc., can solve the problem of surge current without discussing the circuit structure, and achieve the effect of reducing the surge current and reducing the generation

Active Publication Date: 2017-03-22
UNIVERSAL SCIENTIFIC INDUSTRIAL (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this case does not address the issue of inrush current generated when the circuit structure starts up

Method used

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  • Soft starting switch circuit and electronic apparatus
  • Soft starting switch circuit and electronic apparatus
  • Soft starting switch circuit and electronic apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0072] To improve as figure 1 The traditional soft-start switching circuit 1 shown in the figure is activated for the second time, that is, the input voltage V in When changing from a low potential to a high potential for the second time, the capacitor C cannot discharge electric energy at the moment of the previous step-down and cannot continue to be charged again, so the first transistor Q 1 will be fully turned on immediately, causing the output current I Q1 for an excessive instantaneous current. In other words, the surge current cannot be effectively suppressed after the traditional soft-start switch circuit 1 is started for the second time. The technical solution for effectively suppressing the surge current provided by the embodiments of the present invention will be further described below.

[0073] First, please refer to image 3 , image 3 It is the circuit diagram of the soft start switch circuit of the embodiment of the present invention. The soft start switc...

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Abstract

The invention relates to a soft starting switch circuit and an electronic apparatus. The soft starting switch circuit comprises an input end, an output end, a first transistor, a second transistor, a third transistor, a charge energy storage unit, a first resistor and a second resistor. When the input voltage received on the input end changes into high potential from low potential, the second transistor is connected to provide a charging path so that the charge energy storage unit can store electric energy. The voltage on the control end of the first transistor gradually decreases, so that the first transistor is connected gradually to send the input voltage of the input end to the output end to serve as output voltage. When the input voltage received on the input end changes into low potential from high potential, the third transistor is connected to provide a discharging path so that the charge energy storage unit can release the stored electric energy.

Description

technical field [0001] The present invention relates to a switch circuit, and in particular to a soft-start switch circuit capable of suppressing inrush current and an electronic device having the soft-start switch circuit. Background technique [0002] When the electrical product receives the power provided by the power supply, the power supply may output excessive instantaneous current (also called surge current) and cause damage to components in the electrical product. In order to avoid damage caused by excessive instantaneous current when the electrical product is started, the power supply can control the output power to gradually increase from a small value to a normal value at the beginning of the start-up, so as to avoid damage to the circuit. The above-mentioned start-up method This is called a soft start. For example, a pulse width modulation (PWM) controller can be used to control the duty cycle to gradually increase the power output to the electrical product to c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M1/32
Inventor 曾富祥
Owner UNIVERSAL SCIENTIFIC INDUSTRIAL (SHANGHAI) CO LTD
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