Protection circuit and circuit protection device
A protection circuit and overcurrent protection technology, applied in the field of circuits, can solve the problems of irreversibility, single function, slow response, etc., to achieve the effect of improving the response speed and accuracy, and solving the single function
Pending Publication Date: 2021-12-03
SHENZHEN BENCENT ELECTRONICS CO LTD
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Problems solved by technology
[0003] At present, the more commonly used fuses are fuses, thermal fuses, PPTC, etc., and the blown fuses have the disadvantages of single function, slow response, inaccurate response and non-recoverable
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[0021] 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, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.
[0022] figure 1 A schematic circuit diagram of a protection circuit provided for an embodiment of the present invention, such as figure 1 As shown, a protection circuit includes: a control unit 1, an undervoltage protection unit 2, an overvoltage protection unit 3 and an overcurrent protection unit 4;
[0023] The control unit 1 is a first MOS transistor Q1, the source S of the first MOS transistor Q1 is connected to the current input terminal, and the drain D of the first MOS transistor Q1 is connected to the pr...
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The invention discloses a protection circuit and a circuit protection device. The protection circuit comprises a control unit, an under-voltage protection unit, an over-voltage protection unit and an over-current protection unit; the control unit is a first MOS tube, the source electrode of the first MOS tube is connected with the current input end, and the drain electrode of the first MOS tube is connected with a protected electric load and used for controlling the on and off of the electric load; the under-voltage protection unit is formed by connecting a first resistor and a first voltage stabilizing diode in series and then connecting the first resistor and the first voltage stabilizing diode to a grid electrode of a first MOS tube; the overvoltage protection unit is formed by connecting a second resistor and a second voltage stabilizing diode in series and then connecting to the base electrode of a triode; and the overcurrent protection unit is composed of a second MOS tube, a fourth resistor and a silicon controlled rectifier. The problems that a fuse is single in function, slow in response, inaccurate in response and unrecoverable are solved, overvoltage, undervoltage, overcurrent, over-temperature and short-circuit protection functions are achieved, and the effect of improving the response speed and accuracy is achieved.
Description
technical field [0001] Embodiments of the present invention relate to circuit technology, and in particular to a protection circuit and a circuit protection device. Background technique [0002] A fuse is also called a current fuse. The IEC127 standard defines it as a "fuse-link", which is mainly placed in the circuit to limit the current carried by each power circuit to a safe range. Inside. When the circuit fails or is abnormal, the fuse will fuse itself and cut off the current when the current abnormally rises to a certain height and heat, thus protecting the circuit and electrical equipment. [0003] At present, the more commonly used fuses are fuses, thermal fuses, PPTC, etc., and the blown fuses have the disadvantages of single function, slow response, inaccurate response and non-recoverable. Contents of the invention [0004] The invention provides a protection circuit and a circuit protection device to realize over-voltage, under-voltage, over-current, over-tempe...
Claims
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IPC IPC(8): H02H3/20H02H3/24H02H3/08H02H3/10H02H5/04H02H9/00
CPCH02H3/20H02H3/24H02H3/08H02H3/10H02H5/042H02H9/005
Inventor 蔡锦波沈能文
Owner SHENZHEN BENCENT ELECTRONICS CO LTD