An integrated switching tube overcurrent detection circuit
An overcurrent detection, integrated switch technology, applied in the direction of measuring electricity, measuring only current, measuring electrical variables, etc., can solve the problems of power loss, high price of sampling resistor R4, reducing circuit conversion efficiency, etc., to achieve the effect of simple and rigorous structure
Active Publication Date: 2021-07-23
GUANGDONG CHIGO HEATING & VENTILATION EQUIP CO LTD
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Problems solved by technology
[0002] In the field of power control, it is necessary to perform over-current protection on the switching tube connected to the main power circuit, and the primary task of over-current protection is to monitor the current on the switching tube. In the prior art, the current detection on the switching tube is usually used such as figure 1 In the sampling resistor voltage drop detection circuit shown, in this circuit, the high-power and high-precision sampling resistor R4 is expensive, and the large current will cause power loss when flowing through the resistor R6, reducing the conversion efficiency of the circuit
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[0022] The embodiment of the present invention provides an integrated switching tube overcurrent detection circuit, which can realize overcurrent protection for the switching tube by detecting the voltage at one point, has low cost and can improve the conversion efficiency of the main power circuit.
[0023] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0024] see figure 2 , the present i...
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The invention provides an integrated switching tube overcurrent detection circuit, comprising: a switching tube, a diode, a first resistor, a voltage stabilizing source and a voltage detection unit; the drain of the switching tube is connected to the main power circuit, and the source of the switching tube is grounded ; The cathode of the diode is connected to the drain of the switch tube, the anode of the diode is connected to the first end of the first resistor, the second end of the first resistor is connected to the first end of the voltage regulator, and the second end of the voltage regulator is grounded ; The voltage detection unit is connected between the diode and the first resistor; wherein, the output voltage of the stabilized voltage source is higher than the saturation conduction voltage drop of the switch tube. In the switching tube overcurrent detection circuit provided by the present invention, the overcurrent protection of the switching tube can be realized by detecting the voltage at one point, the cost is low, and the conversion efficiency of the main power circuit can be improved.
Description
technical field [0001] The invention relates to the field of power supply control, in particular to an integrated switching tube overcurrent detection circuit. Background technique [0002] In the field of power control, it is necessary to perform over-current protection on the switching tube connected to the main power circuit, and the primary task of over-current protection is to monitor the current on the switching tube. In the prior art, the current detection on the switching tube is usually used such as figure 1 As shown in the sampling resistor voltage drop detection circuit, in this circuit, the high-power and high-precision sampling resistor R4 is expensive, and when a large current flows through the resistor R6, power loss will occur, reducing the conversion efficiency of the circuit. [0003] Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a switching tube overcurrent detection circuit with low cost and low impact on...
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IPC IPC(8): G01R31/26G01R19/00
CPCG01R19/0092G01R31/2637
Inventor 冯尚华蒲志成
Owner GUANGDONG CHIGO HEATING & VENTILATION EQUIP CO LTD