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Switch power circuit

A technology of switching power supply circuit and slow start unit, which is applied in the direction of electrical components, electronic switches, output power conversion devices, etc., which can solve the problems of slow start circuit volume and large switching power supply circuit, and achieve the effect of small size

Inactive Publication Date: 2009-08-19
INNOCOM TECH (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of the excessive volume of the switching power supply circuit caused by the excessive volume of the slow start circuit in the prior art, it is necessary to provide a slow start unit for the switching power supply circuit with a small volume

Method used

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Embodiment Construction

[0015] see figure 2 , is a partial circuit diagram of a preferred embodiment of the switching power supply circuit of the present invention. The switching power supply circuit 20 includes a first input terminal 21, a second input terminal 22, a voltage dividing unit 23, a voltage stabilizing unit 24, a slow start unit 25, a power main control chip 26 and a power output terminal 27 . The first input terminal 21 and the second input terminal 22 respectively provide +5V and +12V operating voltages for the switching power supply circuit 20 . The voltage dividing unit 23 outputs a divided voltage value to the voltage stabilizing unit 24 , and the divided voltage value is a voltage stabilizing reference value of the voltage stabilizing unit 24 . When the current flowing through the slow start unit 25 is too small to cause the output voltage of the switching power supply circuit 20 to be too large, the voltage stabilizing unit 24 controls and adjusts the current size flowing throu...

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Abstract

The invention relates to a slow start unit for a switching power supply circuit. The switching power supply circuit includes a first power supply input terminal and a main power supply control chip. The power supply input terminal provides working voltage for the switching power supply circuit. The slow start unit includes a first resistor, a second resistor, a capacitor, an optocoupler and a first transistor working in an amplifying state. The base of the first transistor is connected to the first power input terminal through the second resistor and the capacitor, the collector is connected to the first power input terminal through the optocoupler and the first resistor, and the emitter is grounded. The main control chip of the power supply performs pulse width modulation on the output current of the optocoupler, so as to output the output voltage of the switching power supply circuit.

Description

technical field [0001] The invention relates to a slow start unit for a switching power supply circuit. Background technique [0002] Due to the advantages of lightness, thinness, and low power consumption, switching power supplies have been widely used in electronic products such as portable products, aviation and automation products, and instrumentation. However, at the moment of switching transition, due to the presence of reactive components in the circuit, as the energy of the reactive components is charged and discharged, the power components will be impacted by excessive current and thermal energy, resulting in component failure and reduced reliability of the switching power supply circuit. Therefore, in order to improve the reliability of the switching power supply circuit, a snubber circuit needs to be provided to suppress the generation of overcurrent and effectively protect the circuit components. [0003] figure 1 It is a partial circuit diagram of a switching ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H03K17/28
Inventor 颜怀柱周通
Owner INNOCOM TECH (SHENZHEN) CO LTD