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PWM signal optimization method and device for charging process of charging pile, equipment and medium

A PWM signal and charging process technology, applied in charging stations, electric vehicle charging technology, electric vehicles, etc., can solve the problems of difficult control of the grounding quality of the power distribution system, PWM signal inclusions, noise and glitches, etc., to achieve easy computer implementation, The effect of long filter delay time and small memory usage

Pending Publication Date: 2020-12-22
珠海兴诺能源技术有限公司
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AI Technical Summary

Problems solved by technology

[0002] During the AC charging process of electric vehicles, the charging pile is connected to the vehicle socket through the connection mode C, and the vehicle handshake confirmation is carried out by judging the voltage change between the CP and PE of the connector. During the charging process, the controller of the charging pile sends out a PWM frequency of 1KHZ signal, on-board chargers and charging pile controllers judge the maximum output current and connection status by judging the amplitude and duty cycle of the PWM signal. Due to the different lengths of charging cables in the actual use environment and the difficulty in controlling the grounding quality of the power distribution system, it leads to The PWM signal is mixed with interference such as noise and glitches

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  • PWM signal optimization method and device for charging process of charging pile, equipment and medium
  • PWM signal optimization method and device for charging process of charging pile, equipment and medium
  • PWM signal optimization method and device for charging process of charging pile, equipment and medium

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Embodiment Construction

[0043] Below, the present invention will be further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of not conflicting, the various embodiments described below or the technical features can be combined arbitrarily to form new embodiments. .

[0044]In one embodiment, the maximum output power of the electric vehicle AC charging pile is 7KW, and the specific specification is 220V32A connection mode C, which meets the relevant national standards and energy standards of charging piles such as GB / T18487.1GB / T20234.2NB / T33002 and other related standards. The main functional architecture is as figure 1 shown. The energy output direction of the whole system is AC->AC, and the whole process is monitored by the control unit. The control unit and the on-board charger interact through the change of the CP (control guide line) signal before, mainly to collect CP to PE (ground wire) The PWM signal betw...

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Abstract

The invention provides a PWM signal optimization method for a charging process of a charging pile. The PWM signal optimization method comprises the steps of initializing a prediction equation, carrying out prediction processing and updating a state. The invention relates to electronic equipment and a storage medium which are used to execute the PWM signal optimization method for the charging process of a charging pile. The invention further relates to a PWM signal optimization device for the charging process of the charging pile. A Kalman filtering algorithm used by the invention can process the sampling data in real time, occupies a small memory, does not need to reserve other historical data except the previous state quantity, is high in calculation speed, and conducts new value estimation of the current state according to a specified recursion method only by combining the estimated value calculated by combining the previous state on the basis of the state equation of the system andthe measured value after new data is measured.

Description

technical field [0001] The invention relates to the technical field of AC charging for electric vehicles, in particular to a PWM signal optimization method, equipment, medium and device in the charging process of a charging pile. Background technique [0002] During the AC charging process of electric vehicles, the charging pile is connected to the vehicle socket through the connection mode C, and the vehicle handshake confirmation is carried out by judging the voltage change between the CP and PE of the connector. During the charging process, the controller of the charging pile sends out a PWM frequency of 1KHZ signal, on-board chargers and charging pile controllers judge the maximum output current and connection status by judging the amplitude and duty cycle of the PWM signal. Due to the different lengths of charging cables in the actual use environment and the difficulty in controlling the grounding quality of the power distribution system, it leads to The PWM signal is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/04G01R29/02B60L53/14
CPCG01R19/04G01R29/02B60L53/14Y02T10/70Y02T10/7072Y02T90/14
Inventor 何立林魏强
Owner 珠海兴诺能源技术有限公司
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