Overcurrent detection circuit, overcurrent detection method and DC conversion system
A technology of overcurrent detection and DC converter, which is applied in the direction of measuring electrical variables, converting DC power input into DC power output, and adjusting electrical variables, etc. Application and other issues, achieve excellent compatibility and flexibility, avoid circuit glitches, and avoid circuit damage
Active Publication Date: 2022-04-12
天宜微电子(北京)有限公司
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[0005] However, the current sampled by the above two structures is the sum of multiple currents. This current is the pulse peak current and changes with the input voltage. Therefore, it is difficult to achieve accurate quantitative protection for output overload, and only qualitative detection of overcurrent; Furthermore, when the power tube is integrated and used outside the chip, due to the different device characteristics, the structure of the current mirror is difficult to put into practice
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[0064] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.
[0065] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0066] figure 1 A schematic diagram of a DC conversion system according to an embodiment of the present invention is shown. The DC conversion system can be applied, for example, to circuits that require high ripple such as display driver chips and automotive chips, and can also be applied to any circuit that requires DC conversion. This application does not limit its application scenarios. Further, the DC conversion system may be an independent device, or a circuit structure integrated inside or...
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The application discloses an overcurrent detection circuit, an overcurrent detection method and a direct current conversion system. The overcurrent detection circuit includes: a detection capacitor, the upper plate is connected to the low potential end of the first resistor through the first switch, the lower plate is connected to the high potential end of the second resistor through the second switch, and the lower plate is also connected to the high potential end of the second resistor through the third switch. The switch is connected to the positive pole of the power supply; the early warning module is connected to the upper plate of the detection capacitor via the fourth switch, wherein, in the first stage, the upper plate of the detection capacitor receives the first voltage of the first resistor, and the lower plate receives the power supply Voltage; in the second stage, the lower plate of the detection capacitor receives the second voltage of the second resistor, the voltage value of the upper plate of the detection capacitor becomes corresponding to the load current of the load module, and the early warning module receives the voltage value for overcurrent detection. The overcurrent detection circuit can accurately sample the voltage value corresponding to the load current, realize the quantitative detection of the overcurrent detection, and improve the accuracy of the overcurrent detection.
Description
technical field [0001] The present invention relates to the technical field of electronic circuits, and more specifically, to an overcurrent detection circuit, an overcurrent detection method and a DC conversion system. Background technique [0002] As an important part of the electronic circuit field, DC-DC (direct current-direct current) converter is suitable for applications with large voltage changes, and its input voltage may be higher than the output voltage or lower than the output voltage. Common non-isolated buck-boost DC converters include Flyback, Cuk, isolated Sepic, and isolated Zeta circuits. Among them, the Cuk-type negative voltage switching converter has the characteristics of low ripple and is very suitable for display driver chips, automotive chips, etc. Circuits with high requirements for ripple are widely used. [0003] If the undervoltage protection is not triggered, once the output current of the DC converter exceeds the rated range or is short-circui...
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IPC IPC(8): G01R19/165H02M3/156
CPCG01R19/16538H02M3/156
Inventor 刘建孙丽娜
Owner 天宜微电子(北京)有限公司