Residual current protection circuit
A technology for protecting circuits and residual current, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as being susceptible to electromagnetic interference, circuit breaker protection function cannot operate normally, and residual current protection circuit diversification restrictions, etc.
Inactive Publication Date: 2012-03-28
WUXI ZIZO ELECTRIC
View PDF0 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In the existing step-down circuits with residual current protection circuit breakers, resistors are used to step down the voltage. Although this solution is simple, when the load power changes slightly, it will not work normally, and it is also susceptible to electromagnetic interference, causing the circuit breaker to fail. The protection function cannot operate normally, and even cause an accident
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0010] Please refer to figure 1 as shown, figure 1 It is a specific circuit diagram of the residual current protection circuit of the present invention. In this embodiment, a residual current protection circuit includes a tripping circuit and a step-down circuit, wherein the tripping circuit includes a tripping coil L1 connected to the pre-stage power supply VCC1, two coils of the tripping coil L1 A diode D1 is connected in parallel with the terminal, the anode of the diode D1 is connected in series with a resistor R1, a thyristor SCR1, and a diode D2 in sequence, the anode of the diode D2 is connected to the cathode of the thyristor SCR1, the cathode of the diode D2 is connected to the ground terminal, the thyristor SCR1 The control electrode of the thyristor SCR2 is connected between the thyristor SCR2 and the grounding capacitor C1, the positive electrode series resistor R2 of the thyristor SCR2 is connected to the subsequent power supply VCC2, and the control electrode of...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a residual current protection circuit, which comprises a tripping circuit and a voltage reduction circuit, wherein the tripping circuit is controlled by a high-voltage resistant thyristor SCR1; a diode D2 combined to the cathode of the thyristor SCR1 and diodes D1 at two ends of a tripping coil absolutely can prevent damage of double voltage and electromagnetic interference which are generated on the tripping coil at the moment of power off to a component; the voltage reduction circuit is subjected to voltage splitting and reducing treatment by a triode, and the latter-stage power supply voltage can be adjusted by U1 to provide a preceding-stage guarantee for using power supplies of single chip microcomputers with various voltage; besides, the working current of the triode can be adjusted according to requirements of a latter-stage load so as to obtain a power supply with required power. With the adoption of the residual current protection circuit, a circuit can stably work at any voltage value in a specified range.
Description
technical field [0001] The invention relates to the technical field of electricity safety protection for electrical equipment, in particular to a residual current protection circuit for protecting a circuit breaker. Background technique [0002] At present, the residual current protector used in the three-phase power supply circuit needs to realize the reliable operation of the residual current protection function in the voltage range of 86V-460V. In the existing step-down circuits with residual current protection circuit breakers, resistors are used to step down the voltage. Although this solution is simple, when the load power changes slightly, it will not work normally, and it is also susceptible to electromagnetic interference, causing the circuit breaker to fail. The protection function cannot operate normally, and even cause an accident. Moreover, the use of resistance step-down can only be used for a dedicated residual current protection chip circuit, and it is diffi...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/22
Inventor 王建忠戈浩吴振锋
Owner WUXI ZIZO ELECTRIC