Alternating-current pile grounding detection system and control method
A grounding detection and AC pile technology, applied in the field of AC pile grounding detection system and control, can solve the problems of misjudgment of grounding detection, insufficient consideration, inability to guarantee insulation withstand voltage requirements, etc., and achieves high reliability, simple circuit and low cost. controllable effect
Pending Publication Date: 2021-09-24
SHANGHAI ENNEAGON ENERGY TECH CO LTD
View PDF0 Cites 1 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
At present, there are many grounding detection methods for existing AC charging piles, but some methods have disadvantages, such as the inability to guarantee the insulation and withstand voltage requirements of the AC L and N incoming lines to the earth PE; When the L and N connections fail, the ground detection will be misjudged, etc.
[0003] Therefore, it is necessary to design an AC pile grounding detection system and control method, which can avoid the grounding detection misjudgment caused by the abnormal connection of L and N, and ensure the insulation and withstand voltage requirements of the AC L and N incoming lines to the earth PE
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
[0033] Example: such as Figure 5 As shown, after the start of the detection, when the main power determination module 2 is diagnosing, if the live wire L and the neutral wire N are normally connected and energized, the sine wave is converted into a steamed bun wave through the rectifier diode 3 D3, and applied to the first signal of the photocoupler U1 Pin, when the voltage exceeds the critical point, the photocoupler U1 is turned on, and the output is low. When the voltage is below the critical voltage, the photocoupler U1 is turned off, and the output is high. Repeat this, and the output pulse wave is given to Controller 5; if the live wire L and the neutral wire N are not normally connected and energized, the No. 1 pin and the No. 2 pin of the photocoupler U1 cannot form a path, and the photocoupler U1 remains in the cut-off state, and the power supply No. 1 passes through the No. 4 pin. The pin inputs +3.3V to the controller 5; Schmidt judges that when the isolation modul...
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 belongs to the technical field of charging piles, and particularly relates to an alternating-current pile grounding detection system and a control method, and the system comprises a single-phase input module, a main electricity judgment module, a resistance-capacitance voltage division module, a Schmidt judgment isolation module and a controller. Compared with the prior art, the invention is advantageous in that: the resistance-capacitance voltage division module and the Schmidt judgment isolation module are adopted, due to symmetrical voltage division circuits, when grounding connection is normal, the voltage of the zero line to the grounding end is 0V, and when the grounding connection is disconnected, the grounding end becomes the midpoint of the live line and the zero line voltage, the voltage of the zero line to the grounding end is changed into 110V sine waves, the voltage is input into a Schmidt judgment isolation module, a comparator connected with positive feedback is used for realizing a Schmidt trigger, and the positive feedback outputs the digital signal, so that the controller only needs to have an input detection function; and a main power judgment module is adopted to judge whether the live wire and the zero wire are effectively connected, so that misjudgment of grounding detection caused by abnormal connection of the live wire and the zero wire is avoided.
Description
technical field [0001] The invention belongs to the technical field of charging piles, in particular to an AC pile grounding detection system and a control method. Background technique [0002] Ground detection technology is a technology that increases charging safety and is an essential safety protection function in AC charging piles. At present, there are many grounding detection methods for existing AC charging piles, but some methods have disadvantages, such as the inability to guarantee the insulation and withstand voltage requirements of the AC L and N incoming lines to the earth PE; When the L and N connections fail, the ground detection will be misjudged. [0003] Therefore, it is necessary to design an AC pile grounding detection system and control method, which can avoid the grounding detection misjudgment caused by the abnormal connection of L and N, and ensure the insulation and withstand voltage requirements of the AC L and N incoming lines to the earth PE. C...
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): G01R31/52
CPCG01R31/52
Inventor 邓思维闫寒明凌凯王鹏超翟刚锋岑广钊唐智翀崔鹏举张健陈豹李景云王苏杰冯敏邹一君李倩
Owner SHANGHAI ENNEAGON ENERGY TECH CO LTD