Circuit structure for automatically adjusting output voltage of peak current circuit
A circuit output and automatic adjustment technology, which is applied in the direction of adjusting electric variable, output power conversion device, DC power input to DC power output, etc. It can solve the problems affecting the normal use of the converter and the damage of the converter, so as to ensure the use The effect of safety, prolonging the service life and reducing the cost of use
Inactive Publication Date: 2015-10-21
南京星霸科技有限公司
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- Application Information
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Problems solved by technology
However, when the converter works in an abnormal condition, such as a short circuit, it will keep working at the maximum peak current for a long time, which will cause damage to the converter and affect the normal use of the converter
Method used
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[0008] The present application will be further described below in conjunction with specific drawings and embodiments.
[0009] Such as figure 1 As shown: in order to automatically adjust the output voltage of the peak current circuit, the application includes an operational amplifier 1, the output terminal of the operational amplifier 1 is connected to the gate terminal of the third MOS transistor M3, and the inverting terminal of the operational amplifier 1 is connected to the third The source terminals of the MOS transistor M3 are connected, and the non-inverting terminal of the operational amplifier 1 forms a feedback voltage input terminal FB; the operational amplifier 1 is connected with the third MOS transistor M3 to form a voltage follower. The source terminal of the third MOS transistor M3 is grounded through the first resistor R1, the drain terminal of the third MOS transistor M3 is connected to the drain terminal of the first MOS transistor M1, the gate terminal of t...
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The invention relates to a circuit structure for automatically adjusting output voltage of peak current circuit. The circuit structure comprises an operation amplifier. The output end of the operation amplifier is connected with the grid end of a third MOS transistor; the source end of the third MOS transistor is connected with the phase reverse end of the operation amplifier and then is grounded through a first resistor; the drain end of the third MOS transistor is connected with the drain end of a first MOS transistor, the grid end of the first MOS transistor and the grid end of a second MOS transistor respectively; the source ends of the first MOS transistor and the second MOS transistor are correspondingly connected and then are connected with a power supply IDC; the power supply IDC is connected with the drain end of the second MOS transistor corresponding to the other end which is connected with the source end of the second MOS transistor; and the drain end of the second MOS transistor is grounded through a second resistor. The circuit structure is simple, convenient to adjust, and safe and reliable, ensures the use safety of a converter, prolongs the service life of the converter, and reduces the use cost of the converter.
Description
technical field [0001] This application relates to a circuit structure, especially a circuit structure for automatically adjusting the output voltage of a peak current circuit, specifically a circuit structure for automatically adjusting the output voltage of a current mode DC-DC converter peak current circuit, which belongs to the current mode The technical field of DC-DC converters. Background technique [0002] DC-DC converters can be divided into voltage mode and current mode according to the feedback mode adopted. Among them, the voltage feedback control is the most basic control technology of the switching power supply, which belongs to the single-loop feedback control method. Voltage feedback control realizes negative feedback of the entire circuit through only one voltage feedback signal, and there is only one feedback loop in the entire control circuit, which is a single-loop control system. Current control can be divided into average current and peak current feed...
Claims
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Inventor 何利伟
Owner 南京星霸科技有限公司