High-reliability starting circuit

A start-up circuit and reliability technology, which is applied in the field of start-up circuits to improve the reliability of switching power supplies, can solve the problem of current stress, first diode reverse recovery current transient pull-down, control IC short-circuit protection logic confusion, and protection intermittent cycle Abnormalities and other problems, to achieve the effect of improved short-circuit reliability performance, wide selection and tolerance range, and improved consistency

Inactive Publication Date: 2019-01-01
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this circuit has some drawbacks: the control IC voltage feedback pin has the risk of overvoltage, current stress and being pulled down by the reverse recovery current transient of the first diode
At high temperature, it is very easy to cause confusion in the control IC short-circuit protection logic, abnormal protection intermittent cycle, and high-temperature short-circuit failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] figure 1 A schematic circuit diagram of the present invention is shown.

[0021] Embodiment 1 of the present invention includes: an AC signal port AC SIGN (BOS pin), an output port FB, a ground wire port GND, a first capacitor C1, a second capacitor C2, a first resistor R1, a second resistor R2, a second capacitor a diode D1. The AC SIGN port is connected to the first capacitor C1, and connected to the first diode anode through the first capacitor C1; the first diode cathode is connected to the output port FB through the second resistor R2; the output port FB is connected to the second capacitor C2 connected to the ground port GND; the first resistor R1 is connected in parallel with the first capacitor.

[0022] Embodiment 1 The principle of improving the short-circuit reliability of the start-up circuit is as follows: before the short-circuit, because the product works normally, ACSIGN is at a low level, and the start-up circuit is not conducted; the voltage of the f...

Embodiment 2

[0026] Embodiment 2 of the present invention is adjusted on the basis of Embodiment 1. The AC signal input port is connected to the anode of the first diode, and the cathode of the first diode is connected to the first diode. One end of the resistor and one end of the first capacitor; the other end of the first resistor and the other end of the first capacitor are connected to one end of the second resistor, and the other end of the second resistor is connected to the output port ; The output port is connected to the ground port through the second capacitor.

[0027] The working principle of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

Embodiment 3

[0029] Embodiment 2 of the present invention is also adjusted on the basis of Embodiment 1. The AC SIGN port is connected to one end of the second resistor through the first capacitor C1; the other end of the second resistor is connected to the anode of the diode D1, and the cathode of the diode D1 connected to the output port FB; the output port FB is connected to the ground port GND through the second capacitor C2; the first resistor R1 is connected in parallel with the first capacitor.

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PUM

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Abstract

The invention discloses a high-reliability starting circuit. The circuit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, a first diode, an alternating-current signal port, an output port, and a ground line port. With the high-reliability circuit disclosed by the invention adopted, the stress problem of the over-current and overvoltage of theoutput port can be effectively suppressed; the start port voltage driven down by the reverse recovery current of the first diode during operation can be effectively solved; the risk of a product shortcircuit abnormality under high temperature is lowered; and the optionality of circuit parameters is further improved, and therefore, the debugging of the starting circuit is easy, and the consistencyof mass production products can be greatly improved.

Description

technical field [0001] The invention relates to a starting circuit, in particular to a starting circuit for improving the reliability performance of a switching power supply. Background technique [0002] In a switching power supply, the general control IC will have the following functions or pins: power supply pin, current detection pin, voltage feedback pin, duty cycle output pin, soft start pin, etc. [0003] During the normal power-on process, the power supply pin reaches the opening threshold from the undervoltage protection voltage, the control IC starts to work, and the soft-start pin voltage begins to climb. At the same time, because the output voltage of the voltage feedback pin is very low, the optocoupler for isolated feedback has no current. The voltage of the voltage feedback pin will rise with the potential of the soft start pin. At this time, the duty cycle will increase with the voltage feedback pin. high and increased. When the output voltage reaches the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
CPCH02M1/32H02H7/008
Inventor 尹显泓王国云冯刚
Owner MORNSUN GUANGZHOU SCI & TECH
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