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An overcurrent protection circuit, method and electronic device
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An overcurrent protection circuit and circuit technology, applied in the direction of adjusting electrical variables, instruments, control/regulation systems, etc., can solve problems such as current detection and protection of HSD drive power tubes, and achieve the effect of reducing design difficulty
Active Publication Date: 2022-01-11
ZHEJIANG GEOFORCECHIP TECH CO LTD
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Abstract
Description
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Problems solved by technology
[0004] In order to solve the technical problem that the existing technology cannot solve the current detection and protection of the HSD driving power tube under high voltage, the application provides an overcurrent protection circuit, including a current mirror module, a switch control module, a high and low voltage isolation module, a bias Set the current output module, the second current mirror, and the reference current output module:
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Embodiment 1
[0067] Such as figure 1 Shown:
[0068] The application provides an overcurrent protection circuit, including:
[0069] An overcurrent protection circuit, including a current mirror module 101, a switch control module 102, a high and low voltage isolation module 103, a bias current output module 105, a second current mirror 106, and a reference current output module 104:
[0070] The switch control module 102 is connected to the current mirror module 101 and the high and low voltage isolation module 103, and the high and low voltage isolation module 103 is connected to the bias current output module 105 and one end of the second current mirror 106, so The other end of the second current mirror 106 and the reference current output module 104 are commonly connected to the comparison current output end;
[0071] The current mirror module 101 includes:
[0072] first current mirror;
[0073] The first current mirror is composed of a first PMOS transistor and a second PMOS tran...
Embodiment 2
[0114] The present application can also provide an electronic device equipped with the overcurrent protection circuit described in Embodiment 1 above.
Embodiment 3
[0116] The present application can also provide an overcurrent protection method, which is applied to the overcurrent protection circuit described in the above-mentioned embodiment, including:
[0117] Based on the current mirror module, the current intensity output by the high-power output tube is collected, and the current mirror copy is performed on it and the working state is judged. The working state judgment includes judging whether the collected current exceeds the preset threshold;
[0118] When the current flowing through the current mirror module does not exceed the preset threshold, the switch control module is closed, and its current branch cannot flow to the subsequent circuit through the switch control module, and the second current mirror cannot be opened, showing a high-impedance state. At this time, the second The current mirror and the reference current output module jointly input the current to the comparison output terminal, and the result after comparison a...
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Abstract
This application relates to an overcurrent protection circuit, including a current mirror module, a switch control module, a high and low voltage isolation module, a bias current output module, a second current mirror, and a reference current output module: the switch control module and the current mirror module and the high and low voltage isolation module, the high and low voltage isolation module is connected to the bias current output module and one end of the second current mirror, and the other end of the second current mirror is in common with the reference current output module Connect to the comparative current output. The design of this application realizes the voltage and current detection and protection of the HSD driving power tube under high voltage; including the sampling and processing of the high-power tube current, the control circuit of high-low voltage conversion and low-voltage comparison output.
Description
technical field [0001] The present application relates to the technical field of power management chips, and more specifically, the present application relates to an overcurrent protection circuit, method and electronic equipment. Background technique [0002] In industrial production, according to the safe working characteristics of circuit components, any device with a determined width and length has its specific safe working voltage and safe working current range. In a high-voltage working environment, if the HSD power tube is to work normally, it is required to have a certain ability to flow a large current, and at the same time ensure that the voltage and current are within the safe operating range. [0003] In order to achieve this purpose, it is necessary to detect the current flowing through the HSD power tube synchronously during the circuit operation. When the current exceeds the safe operating range of the components, the high-voltage power tube can be turned off ...
Claims
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Application Information
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