CN-121986036-A - Charging device for electric vehicle

Abstract

An electric vehicle charging device according to an embodiment of the present invention includes a connection unit to receive a Control Pilot (CP) signal of a Pulse Width Modulation (PWM) type, a first voltage detection unit to detect a first voltage of the CP signal, a second voltage detection unit to detect a second voltage of the CP signal, and a control unit to calculate a third voltage that is a difference between the first voltage and the second voltage, and determine a charging state of the charging device by using the detected first voltage and the calculated third voltage, wherein the first voltage is a maximum voltage of the CP signal, the second voltage is a difference between the maximum voltage and a minimum voltage of the CP signal, and the third voltage is a minimum voltage of the CP signal.

Inventors

• SONG YIZHONG

Assignees

• LG伊诺特有限公司

Dates

Publication Date

20260505

Application Date

20241004

Priority Date

20231005

Claims (10)

1. 1. A charging device for an electric vehicle, comprising: A connector configured to receive a Control Pilot (CP) signal in a Pulse Width Modulation (PWM) form; a first voltage detector configured to detect a first voltage of the CP signal; a second voltage detector configured to detect a second voltage of the CP signal, and A controller configured to calculate a third voltage that is a difference between the first voltage and the second voltage, and determine a state of charge of the charging device by using the detected first voltage and the calculated third voltage; wherein the first voltage is a maximum voltage of the CP signal, the second voltage is a difference between the maximum voltage and a minimum voltage of the CP signal, and the third voltage is a minimum voltage of the CP signal.
2. 2. The charging device of claim 1, wherein a state of charge of the charging device is one of a charger off state, a charger connected state, a state of charge, and an error state.
3. 3. The charging device of claim 1, wherein: Determining a charger off state when a first voltage detected by the first voltage detector is +11V to +13V and a second voltage detected by the second voltage detector is +23V to +25V; Determining a charger connection state when a first voltage detected by the first voltage detector is +8V to +10V and a second voltage detected by the second voltage detector is +20V to +22V; Determining as a charged state when the first voltage detected by the first voltage detector is +5V to +7V and the second voltage detected by the second voltage detector is +17V to +19V, or when the first voltage detected by the first voltage detector is +2V to +4V and the second voltage detected by the second voltage detector is +14V to +16V, and An error state is determined when the first voltage detected by the first voltage detector is-1V to +1V and the second voltage detected by the second voltage detector is +11V to +13V, or when the first voltage detected by the first voltage detector is-13V to-11V and the second voltage detected by the second voltage detector is-1V to +1V.
4. 4. The charging device of claim 1, wherein the second voltage detector comprises a first capacitor having one end connected to a first node between the connector and the first voltage detector, a first diode having one end connected to the other end of the first capacitor and the other end connected to ground, a second diode having one end connected to one end of the first diode, and a second capacitor having one end connected to the other end of the second diode and the other end connected to ground.
5. 5. The charging device of claim 4, wherein the second voltage detector further comprises a resistor connected between the other end of the second diode and one end of the second capacitor.
6. 6. The charging device of claim 4, wherein the first voltage detector comprises a third diode having one end connected to the first node, and a third capacitor having one end connected to the other end of the third diode and the other end connected to ground.
7. 7. The charging device of claim 6, wherein a second node between a second diode and a second capacitor of the second voltage detector and a third node between a third diode and a third capacitor of the first voltage detector are connected to the controller, respectively.
8. 8. The charging device of claim 1, further comprising a filter unit disposed between the connector and the first node.
9. 9. A control method of a charging device for an electric vehicle, comprising: receiving a Control Pilot (CP) signal in a Pulse Width Modulation (PWM) form; detecting a first voltage of the CP signal; detecting a second voltage of the CP signal; calculating a third voltage as a difference between the first voltage and the second voltage, and Determining a state of charge of the charging device by using the detected first voltage and the calculated third voltage, Wherein the first voltage is a maximum voltage of the CP signal, the second voltage is a difference between the maximum voltage and a minimum voltage of the CP signal, and the third voltage is a minimum voltage of the CP signal.
10. 10. The control method according to claim 9, wherein the state of charge of the charging device is one of a charger off state, a charger connected state, a state of charge, and an error state.

Description

Charging device for electric vehicle Technical Field The present invention relates to electric vehicles, and more particularly to charging of electric vehicles. Background An eco-friendly vehicle such as an Electric Vehicle (EV) or a plug-in hybrid electric vehicle (PHEV) charges a battery with an Electric Vehicle Supply Equipment (EVSE) installed at a charging station. To charge the EV, the EV and the EVSE communicate through a charging connector connected between the EVSE and the EV. When the charging connector is connected between the EVSE and the EV, charging is started after signaling for charging is performed between the EVSE and the EV. A CP (control pilot) pin is present in the charging connector, and a CP signal in PWM (pulse width modulation) form is transmitted from the EVSE to the EV through the CP pin. Interaction between the EVSE and the EV may be monitored and controlled by the CP signal, and the voltage amplitude of the CP signal may vary for each state of charge. Therefore, the charging device of the EV must detect the voltage amplitude of the CP signal. The charging device of the EV needs a method to accurately and efficiently detect the voltage amplitude of the CP signal. Disclosure of Invention [ Technical problem ] The technical problem to be solved by the present invention is to provide a charging device for charging an Electric Vehicle (EV). [ Technical solution ] The charging device for an electric vehicle according to one embodiment of the present invention includes a connector that receives a Control Pilot (CP) signal in a Pulse Width Modulation (PWM) form, a first voltage detector that detects a first voltage of the CP signal, a second voltage detector that detects a second voltage of the CP signal, and a controller that calculates a third voltage that is a difference between the first voltage and the second voltage, and determines a charging state of the charging device by using the detected first voltage and the calculated third voltage, wherein the first voltage is a maximum voltage of the CP signal, the second voltage is a difference between the maximum voltage and a minimum voltage of the CP signal, and the third voltage is a minimum voltage of the CP signal. The state of charge of the charging device may be one of a charger off state, a charger connected state, a charged state, and an error state. The charger off state may be determined when the first voltage detected by the first voltage detector is +11V to +13V and the second voltage detected by the second voltage detector is +23V to +25V, the charger on state may be determined when the first voltage detected by the first voltage detector is +8V to +10V and the second voltage detected by the second voltage detector is +20V to +22V, the charger on state may be determined when the first voltage detected by the first voltage detector is +5V to +7V and the second voltage detected by the second voltage detector is +17V to +19V, or the first voltage detected by the first voltage detector is +2V to +4V and the second voltage detected by the second voltage detector is +14V to +16V, and the first voltage detected by the first voltage detector is +5V to +7V and the second voltage detected by the second voltage detector is +17V to +19, or the second voltage detected by the second voltage detector is +1 to + V to +3252 and the second voltage detected by the second voltage detector is 3243 to +3243, or the first voltage detected by the second voltage detector is +14 to +3243 and the second voltage detected by the second voltage detector is + V to + V. The second voltage detector may include a first capacitor having one end connected to a first node between the connector and the first voltage detector, a first diode having one end connected to the other end of the first capacitor and the other end connected to ground, a second diode having one end connected to one end of the first diode, and a second capacitor having one end connected to the other end of the second diode and the other end connected to ground. The second voltage detector may further include a resistor connected between the other end of the second diode and one end of the second capacitor. The first voltage detector may include a third diode having one end connected to the first node, and a third capacitor having one end connected to the other end of the third diode and the other end connected to ground. A second node between the second diode and the second capacitor of the second voltage detector and a third node between the third diode and the third capacitor of the first voltage detector may be connected to the controller, respectively. A filter unit disposed between the connector and the first node may also be included. A control method of a charging device for an electric vehicle according to one embodiment of the present invention includes receiving a Control Pilot (CP) signal in a Pulse Width Modulation (PWM) form, detecting a first voltage of the CP signal, detect