A switching power supply and its voltage protection method
A technology of voltage protection and switching power supply, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of increasing the cost and volume of switching power supply, and achieve the effect of reducing cost and volume and reducing withstand voltage requirements.
Active Publication Date: 2016-04-20
XUJI GRP +3
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Problems solved by technology
If the existing switching power supply scheme with only undervoltage and overvoltage protection is used, it is necessary to select a rectifying voltage stabilizing capacitor and a power switch tube with a high withstand voltage value, which will increase the cost and size of the switching power supply
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[0016] The present invention will be further introduced below in conjunction with the accompanying drawings and specific embodiments.
[0017] Such as figure 1 Shown is the schematic diagram of the embodiment of the switching power supply of the present invention. It can be seen from the figure that the rectifying voltage stabilizing capacitor is connected in series in the voltage stabilizing branch connected to the rectifier and its output terminal, and the two ends of the rectifying voltage stabilizing capacitor are connected with switch control circuit, the switch control circuit is enabled and controlled by the voltage protection control circuit, the output of the rectifier is connected with a voltage threshold comparison circuit, the voltage threshold comparison circuit is used to compare the set voltage threshold with the output voltage of the rectifier, and send the comparison result to the voltage protection The control circuit serves as the control basis of the voltag...
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The invention discloses a switching power supply and a protection method thereof. An access switch controlled by a voltage protection control circuit is serially arranged in a series branch for a rectifier and a commutating and voltage stabilizing capacitor of the switching power supply, the voltage of the commutating and voltage stabilizing capacitor is connected into a switching control circuit, commutating voltage is compared with a preset voltage threshold by a voltage threshold circuit, the enabling state of the switching control circuit of the switching power supply and the state of the access switch are controlled by the voltage protection control circuit, namely, a withstanding voltage protection function realized by the access switch is added, and under-voltage, over-voltage and withstanding voltage protection functions are realized. Voltage protection for the commutating and voltage stabilizing capacitor, the switching control circuit and an internal power switch tube is realized by controlling off of the switch in an access manner, requirements on withstanding voltage of the elements are lowered, and the cost and the size of the switching power supply are reduced.
Description
technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a switching power supply and a voltage protection method thereof. Background technique [0002] With the development of power electronics technology, switching power supply is widely used in various electronic and electrical equipment fields, and switching power supply technology is also developing rapidly. At present, the existing switching power supply design only sets the undervoltage and overvoltage protection according to the input AC voltage variation range. According to the "Data Book and Design Guide" of the American PI company (Power Integrations Inc.) on switching power supply chips, the existing switching power supply circuits such as figure 1 As shown, a rectifying voltage stabilizing capacitor is connected in series in the voltage stabilizing branch connected to the output terminal of the rectifier, and a switch control circuit is connec...
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IPC IPC(8): H02H7/125
Inventor 金言庞浩张长江黄明山
Owner XUJI GRP