Circuit with current-limiting locking function
A technology for locking circuits and current control circuits, which is applied to emergency protection circuit devices, circuit devices, and emergency protection circuit devices for limiting overcurrent/overvoltage, and can solve the problems of high difficulty in circuit design, inability to shut down circuits, and high Hardware level and other issues, to achieve the effect of flexible setting of current value, simple and easy-to-use circuit, high reliability and stability
Active Publication Date: 2021-01-05
无锡格林通安全装备有限公司
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Problems solved by technology
The technical method of the current-limiting circuit is generally to apply a constant voltage on the current-limiting resistor to limit the maximum output power. The advantage is that the circuit is simple, and the disadvantage is that it will always output the maximum limited power when the load is short-circuited and cannot be turned off. circuit; the technical method of the cut-off circuit is generally to use the sampling resistor to monitor the current of the loop, and when the current exceeds the set maximum current, the power supply output is turned off. The advantage is that the shutdown speed is fast and there is no current output when the current is over-current. , the circuit design is more difficult and requires a higher level of hardware
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[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0029] A circuit with a current-limiting locking function proposed in an embodiment of the present invention includes: a current detection circuit, a current control circuit, a power supply switch control circuit and an over-current locking circuit;
[0030] The current detection circuit is used to detect the current value in the power supply circuit, convert the current signal into a voltage signal, and feed back to the current control circuit;
[0031] The current control circuit is used to convert the voltage signal provided by the current detection circuit into a switch signal. When the current...
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The invention provides a circuit with a current limiting locking function. The circuit comprises a current detection circuit, a current control circuit, a power supply switch control circuit and an overcurrent locking circuit, wherein the current detection circuit is used for detecting a current value in the power supply loop, converting a current signal into a voltage signal and feeding back thevoltage signal to the current control circuit; the current control circuit is used for converting the voltage signal provided by the current detection circuit into a switching signal, when the currentis normal, the switching signal is off, and when the current value exceeds a limit value, the switching signal is on, and the switching signal is fed back to the power supply switch control circuit;the power supply switch control circuit is used for realizing switch control on the power supply loop according to the switch signal provided by the current control circuit, opening the power supply loop when the switch signal is off, and closing the power supply loop and cutting off power supply output when the switch signal is on; in the circuit disclosed in the invention, the power supply loopis closed when current limiting is realized.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a circuit with a current limiting and locking function. Background technique [0002] With the development of electronic technology, power supply devices pay more and more attention to safety performance, among which current limiting technology is the core technology to ensure safety performance. There are two types of current limiting technology: current limiting type and intercepting type. The technical method of the current-limiting circuit is generally to apply a constant voltage on the current-limiting resistor to limit the maximum output power. The advantage is that the circuit is simple, and the disadvantage is that it will always output the maximum limited power when the load is short-circuited and cannot be turned off. circuit; the technical method of the cut-off circuit is generally to use the sampling resistor to monitor the current of the loop, and when t...
Claims
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IPC IPC(8): H02H9/02
CPCH02H9/02
Inventor 杨伟伟周永杰蔺宁宁周水淼
Owner 无锡格林通安全装备有限公司