An input voltage slow-down undervoltage protection circuit and method for a switching power supply
An undervoltage protection, switching power supply technology, applied in electrical components, output power conversion devices, conversion equipment with intermediate conversion to AC, etc. At the same time, it can meet the requirements of interruption and slow drop, and achieve the effect of increasing interruption duration, reducing the probability of secondary equipment logic errors or malfunctions, and improving input adaptability.
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[0035] The present invention will be further described below. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.
[0036] see figure 1 , the input side circuit of a common switching power supply usually includes a filter unit, a rectifier unit (rectifier bridge or anti-reverse diode) and an energy storage capacitor (usually an electrolytic capacitor).
[0037] An embodiment of the present invention provides an undervoltage protection circuit for switching power supply input voltage drop slowly, including:
[0038] exist figure 1 The front end and back end of the rectifier unit (rectifier bridge or anti-reverse diode) are respectively provided with voltage sampling circuits, such as figure 2 As shown, the front-end voltage sampling circuit obtains the sampling voltage V1 through the voltage dividing resistors R1 and R2; the back-end voltage sampling ...
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