Pulse generation circuit, current detection circuit, switching power supply and pulse generation method

Abstract

The invention discloses a pulse generation circuit, a current detection circuit, a switching power supply and a pulse generation method. An input pulse signal and a periodic signal become valid from invalid at a same moment; the time when the periodic signal is valid is longer than the time when the pulse signal is valid; the pulse signal and the periodic signal have a same cycle; a first control signal and a second control signal are invalid when the input pulse signal is valid; a first voltage is linearly increased when the input pulse signal is valid; when the periodic signal is valid and the input pulse signal is invalid, the voltage keeps unchanged; when the periodic signal becomes invalid from valid, the voltage starts to be linearly decreased and the first control signal becomes valid from invalid; when the first voltage is decreased to a fixed voltage, the first control signal becomes invalid from valid, and the second control signal becomes valid from invalid; the first voltage is kept at the fixed voltage till the input pulse signal becomes valid from invalid, and the second control signal becomes invalid from valid; and the first control signal is a signal for characterizing a specific pulse width.

Description

Technical field [0001] The invention relates to the technical field of power electronics, in particular to a pulse generation circuit, a current detection circuit, a switching power supply and a pulse generation method. Background technique [0002] In a circuit, it is often necessary to find a specific moment of an input pulse and generate another specific pulse. In the prior art, the input pulse signal is delayed by an RC circuit to find a specific moment of the input pulse, thereby generating another pulse. However, because the resistance value of the resistor and the capacitance value of the capacitor are discrete and have a large deviation, it is impossible to accurately find the specific moment of the input pulse. Moreover, in integrated circuits, the discrete type of RC parameters is larger than the discrete type of discrete component RC parameters, and the resistance and capacitance areas are large, which enlarges the area of ​​the entire chip and increases the productio...

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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a pulse generation circuit, a current detection circuit, a switching power supply and a pulse generation method to solve the problem in the prior art that it is impossible to accurately find the specific moment of the input pulse and generate another pulse

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