Switch power supply circuit
AssigneeCrm Icbg (Wuxi) Co., Ltd.
InventorsJin Li, Yong You
Life of this patent
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Abstract
The present disclosure provides a switch power supply circuit, which includes a step-down transistor, a control module, a first switch transistor, a second switch transistor, a third switch transistor, and a power switch transistor. In the switch power supply circuit of the present disclosure, the first terminal of the second switch transistor is directly coupled with the input voltage, and the second switch transistor can directly obtain sufficient driving current from the input voltage to drive the power switch transistor. The present application can ensure the reliability and efficiency of the system without an additional energy storage capacitor, which reduces the costs of the system.
Claims10
A switch power supply circuit, comprising:
- a step-down transistor, including a first terminal, a second terminal, and a third terminal, the first terminal of the step-down transistor is coupled with an input voltage, and the second terminal of the step-down transistor is grounded;
- a first switch transistor, including a first terminal, a second terminal, and a control terminal, the control terminal of the first switch transistor is coupled with a reference voltage signal, the first terminal of the first switch transistor is coupled with the third terminal of the step-down transistor;
- a control module, including an input terminal, an output terminal, and a grounded terminal, the input terminal of the control module is coupled with the second terminal of the first switch transistor, and the grounded terminal of the control module is grounded, the control module is configured to generate a first control signal and a second control signal, which are output through the output terminal of the control module;
- a power switch transistor, including a first terminal, a second terminal, and a control terminal;
- a second switch transistor, including a first terminal, a second terminal, and a control terminal, the control terminal of the second switch transistor is coupled with the output terminal of the control module to receive the first control signal, the first terminal of the second switch transistor is coupled with the input voltage, and the second terminal of the second switch transistor is coupled with the control terminal of the power switch transistor;
- and
- a third switch transistor, including a first terminal, a second terminal, and a control terminal, and the control terminal of the third switch transistor is coupled with the output terminal of the control module to receive the second control signal, the first terminal of the third switch transistor is coupled with the control terminal of the power switch transistor, and the second terminal of the third switch transistor is grounded.
Dependencies are inferred from the claim text.