Electric power current control circuit
A technology for controlling circuits and power currents, applied in circuit devices, emergency protection circuit devices, and protection against overcurrents, etc., can solve problems such as poor anti-interference ability, and achieve strong anti-interference ability, simple circuit structure, and low cost. low effect
Inactive Publication Date: 2017-11-21
HUAIYIN TEACHERS COLLEGE
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Problems solved by technology
Many existing electric equipment current limiting protection circuits are controlled by chip components, and the anti-interference ability is poor, especially in high-power electric equipment.
Method used
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[0009] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, 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.
[0010] see figure 1 , in an embodiment of the present invention, a power current control circuit includes a current transformer U1, a current transformer U2, a rectifier bridge Q1, a rectifier bridge Q2, a resistor R3, a capacitor C1, and a potentiometer RP1, the primary of the current transformer U1 The two ends of the coil are connected to phase A of the three-phase power supply, the two ends of the secondary coil of the current transformer U1 are respective...
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The invention discloses an electric power current control circuit comprising a current transformer U1, a current transformer U2, a rectifier bridge Q1, a rectifier bridge Q2, a resistor R3, a capacitor C1 and a potentiometer RP1, wherein two ends of a primary wire coil of a current transformer U1 are connected with a phase A of a three phase power source, and two ends of a secondary wire coil of the current transformer U1 are respectively connected with a lead pin 1 of the rectifier bridge Q1 and a lead pin 3 of the rectifier bridge Q1; a lead pin 2 is connected with the resistor R3, the capacitor C1 and a lead pin 2 of the rectifier bridge Q2; a lead pin 4 of the rectifier bridge Q2 is connected with the other end of the capacitor C1 and one end of the potentiometer RP1, a lead pin 1 of the rectifier bridge Q2 and a lead pin 3 of the rectifier bridge Q2 are respectively connected with two ends of a secondary wire coil of the current transformer, and two ends of a primary wire coil of the current transformer U2 are respectively connected with a phase C of the three phase power source. The electric power current control circuit disclosed in the invention is simple in circuit structure, low in cost and small in size; no chip element is used, strong anti-interference capability can be realized, and the electric power current control circuit is suitable for electric power equipment which is large in power.
Description
technical field [0001] The invention relates to a control circuit, in particular to a power current control circuit. Background technique [0002] Many electronic devices have a rated current, and it is not allowed to exceed the rated current, otherwise the device will be burned. So some equipment has a current protection module. When the current exceeds the set current, the device will automatically power off to protect the device. Such as the motherboard usb generally has usb overcurrent protection to protect the motherboard from being burned. When a short circuit occurs in the line, one of the important features is that the current in the line increases sharply. When the current flows through a predetermined value, the protection device that responds to the increase in the current is called overcurrent protection. Many existing current-limiting protection circuits of power equipment are controlled by chip components, and the anti-interference ability is poor, especiall...
Claims
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IPC IPC(8): H02H3/08H02H3/04
CPCH02H3/08H02H3/04
Inventor 姬保卫陈贵宾孙红兵陈华宝戴金桥
Owner HUAIYIN TEACHERS COLLEGE