System for respond to a demand response, control circuit for electric vehicles to respond to a demand response and method for driving the same
The present disclosure relates to a system for respond to a demand response, a control circuit for electric vehicles, and a method for driving the same capable of efficiently responding to a demand response. The system includes an on board diagnostic configured to receive a demand response signal directly from a distributed energy resource management system and output a command signal according to the demand response signal from the distributed energy resource management system, a charging device configured to charge a battery of an electric vehicle, and a charge reference change circuit configured to modulate a pilot signal supplied from a charging equipment to the charging device according to a command signal from the on board diagnostic.
1 . A control circuit for electric vehicles to respond to a demand response, comprising:
an on board diagnostic configured to receive a demand response signal directly from a distributed energy resource management system and output a command signal according to the demand response signal from the distributed energy resource management system;
a charging device configured to charge a battery of an electric vehicle; and
a charge reference change circuit configured to modulate a pilot signal supplied from a charging equipment to the charging device according to a command signal from the on board diagnostic;
wherein the charge reference change circuit includes:
an impedance matching unit and a duty ratio modulation unit,
wherein the impedance matching unit includes:
a first switching element configured to be controlled according to a command signal from the on board diagnostic and connected between a first node and a second node; and
a first resistor and a second resistor configured to be connected in parallel between the second node and a third node,
wherein the duty ratio modulation unit includes:
a third resistor;
a second switching element configured to be controlled according to a command signal from the on board diagnostic and connected between the first node and one terminal of the third resistor; and
a pulse generator configured to be connected between the other terminal of the third resistor and the third node.
2 . The control circuit of claim 1 , wherein the charge reference change circuit modulates a pilot signal supplied from the charging equipment to the charging device by modulating a duty ratio of the pilot signal.
3 . The control circuit of claim 2 , wherein the charge reference change circuit includes:
the impedance matching unit configured to match impedances between the charging equipment and the charge reference change circuit according to the command signal from the on board diagnostic; and
the duty ratio modulation unit configured to transmit the pilot signal of a modulated duty ratio to the charging device according to a command signal from the on board diagnostic.
4 . The control circuit of claim 1 , wherein the charge reference change circuit is disposed in either an electric vehicle or a charging cable connecting the electric vehicle and the charging equipment.
5 . A system for responding to a demand response, comprising:
a distributed energy resource management system;
an electric vehicle configured to directly receive a demand response signal from the distributed energy resource management system; and
a charging equipment,
wherein a control circuit of the electric vehicle includes:
an on board diagnostic configured to receive the demand response signal directly from the distributed energy resource management system and output a command signal according to the demand response signal;
a charging device configured to charge a battery of the electric vehicle; and
a charge reference change circuit configured to modulate a pilot signal supplied from a charging equipment to the charging device according to a command signal from the on board diagnostic;
wherein the charge reference change circuit includes:
an impedance matching unit and a duty ratio modulation unit,
wherein the impedance matching unit includes:
a first switching element configured to be controlled according to a command signal from the on board diagnostic and connected between a first node and a second node; and
a first resistor and a second resistor configured to be connected in parallel between the second node and a third node,
wherein the duty ratio modulation unit includes:
a third resistor;
a second switching element configured to be controlled according to a command signal from the on board diagnostic and connected between the first node and one terminal of the third resistor; and
a pulse generator configured to be connected between the other terminal of the third resistor and the third node.
6 . The system of claim 5 , wherein the charge reference change circuit modulates a pilot signal supplied from the charging equipment to the charging device by modulating a duty ratio of the pilot signal.
7 . The system of claim 6 , wherein the charge reference change circuit includes:
the impedance matching unit configured to match impedances between the charging equipment and the charge reference change circuit according to the command signal from the on board diagnostic; and
the duty ratio modulation unit configured to transmit the pilot signal of a modulated duty ratio to the charging device according to a command signal from the on board diagnostic.
8 . The system of claim 5 , wherein the charge reference change circuit is disposed in either an electric vehicle or a charging cable connecting the electric vehicle and the charging equipment.
9 . A method for driving a control circuit for electric vehicles to respond to a demand response, comprising:
receiving a demand response signal directly from a distributed energy resource management system, and outputting a command signal according to the demand response signal; and
modulating a pilot signal supplied from a charging equipment to a charging device for automatically charging a battery according to the command signal;
wherein the modulating of the pilot signal turns on a switching element according to the command signal of an on-board diagnostic device and modulates a duty ratio of the pilot signal from a pulse generator, and
wherein the modulating of the pilot signal includes:
controlling a first switching element connected between a first node and a second node according to the command signal;
controlling an impedance matching unit that includes a first resistor and a second resistor connected in parallel between the second node and a third node;
controlling a second switching element connected between the first node and one terminal of a third resistor according to the command signal; and
modulating the duty ratio of the pilot signal using the pulse generator, the pulse generator being connected between the other terminal of the third resistor and the third node.