A power supply line protection circuit
A technology for power supply lines and protection circuits, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as difficult to accurately control instantaneous power failure of loads, and achieve the effect of precise control
Active Publication Date: 2018-10-23
ZHEJIANG ZHONGFU ELECTRIC
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] For this reason, the technical problem to be solved by the present invention is that it is difficult to accurately control in the prior art to realize the delayed power-off when the load is overloaded and the instantaneous power-off when the load is short-circuited
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
[0040] This embodiment provides a power supply line protection circuit, such as figure 1 As shown, it includes: a current transformer 11, a rectification unit 12, a detection unit 13 and a protection unit 14, the live wire of the power supply line passes through the magnetic ring of the current transformer 11, and the rectification unit 12 is used to convert the current The induced current generated by the coil of the transformer 11 is converted into a DC voltage, and the detection unit 13 obtains the DC voltage from the rectification unit 12, and outputs a first level when the power supply line is not overloaded or short-circuited; When the line is overloaded, the second level is delayed and output, and when the power supply detection line is short-circuited, the second level is output immediately, and the protection unit 14 controls the power supply when the detection unit 13 outputs the first level. The line remains on, and when the detection unit 13 outputs the second leve...
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 provides a protection circuit for a power supply line. The protection circuit comprises a current transducer, a rectifying unit, a detection unit and a protection unit, wherein a fire wire of the power supply line penetrates through a magnetic ring of the current transducer; the rectifying unit is used for converting induction current generated by a coil of the current transducer into direct current voltage; the detection unit is used for acquiring direct current voltage from the rectifying unit; when the power supply line has no overload or short-circuit faults, a first level is outputted by the detection unit; when the power supply line has the overload fault, a second level is outputted by the detection unit in a delay mode; when a power supply detection line has the short-circuit fault, the second level is immediately outputted by the detection unit; the protection unit is used for controlling the power supply line to keep conductive when the detection unit outputs the first level and controlling the power supply line to be broken off when the detection unit outputs the second level, so delay power outage of the load during overload and instant power outage of the load during short circuit can be realized by accurate control.
Description
technical field [0001] The invention relates to the technical field of relay protection, in particular to a power supply line protection circuit. Background technique [0002] When too many loads are connected in parallel in the circuit, the load power in the circuit will exceed the rated power that the wire can withstand, and the load resistance between the live wire and the neutral wire will be too small, which will cause the current in the circuit to be too large The device is hot. Long-term overloading of the line will reduce the insulation level of the line, and even burn the equipment or line. And if the live wire of the load in the circuit is in contact with the neutral wire, and the low-resistance short circuit between the live wire and the neutral wire will cause a short circuit, it is equivalent to that the power supply is directly connected to the live wire and the neutral wire to form a closed loop without passing through the load. The circuit burnt out due to ...
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 Patents(China)
IPC IPC(8): H02H7/26
Inventor 倪向勇陈志伟倪向宇
Owner ZHEJIANG ZHONGFU ELECTRIC