Switching power supply controlling circuit and controlling method thereof
AssigneeJoulwatt Technology (Hangzhou) Co., Ltd.
InventorsYongji He, Xunjin Dou, Xunwei Zhou
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Abstract
This invention provides a switching power supply controlling circuit, the switching power supply comprises an upper transistor and a lower transistor, the switching power supply controlling circuit comprises a boost circuit, an input terminal of the boost circuit is connected to an input terminal of the switching power supply, the boost circuit output a first voltage to control a working state of the boost circuit, driving the upper transistor to be in an on state. The switching power supply controlling circuit adopts a boost circuit to provide a driving power for the upper transistor, and there is no need to set a bootstrap pin or a bootstrap capacitor.
Claims14
A switching power supply controlling circuit, wherein a switching power supply comprises an upper transistor and a lower transistor, the switching power supply controlling circuit comprises a boost circuit, an input terminal of the boost circuit is connected to an input terminal of the switching power supply, the boost circuit output a first voltage to drive the upper transistor to be in an on state;
- wherein the switching power supply controlling circuit further comprises an auxiliary circuit the auxiliary circuit receives the first voltage, and an output terminal of the auxiliary circuit is connected to a control terminal of the upper transistor to control the upper transistor to be in an off stat.
A switching power supply controlling method, wherein the switching power supply comprises an upper transistor and a lower transistor, wherein the controlling method comprises:
- connecting an input terminal of the switching power supply with an input terminal of a boost circuit, outputting an first voltage from the boost circuit to control a working state of the boost circuit, driving the upper transistor to be in an on state;
- and
- receiving the first voltage by an auxiliary circuit, connecting a control terminal of the upper transistor with an output terminal of the auxiliary circuit to control the upper transistor to be in an off state.
Dependencies are inferred from the claim text.