Integrated vehicle power converter and battery charger
Responsive to a voltage across a capacitor being greater than a voltage across a traction battery, a controller may open switches such that charge current from a DC charger flows through a diode to the traction battery without following through coils of an electric machine and without flowing through an inverter.
1 . A vehicle comprising:
a traction battery;
an electric machine;
a bidirectional boost inverter electrically between the traction battery and electric machine;
input circuitry including a capacitor, a diode, and a pair of series connected switches, wherein the pair of switches are connected between an AC charger and the bidirectional boost inverter; and
one or more controllers programmed to, responsive to a voltage across the capacitor being greater than a voltage across the traction battery, open the pair of switches such that charge current from a DC charger electrically connected with the input circuitry flows through the diode to the traction battery without following through coils of the electric machine and without flowing through the inverter.
2 . The vehicle of claim 1 , wherein the one or more controllers are further programmed to, responsive to the voltage across the capacitor being less than the voltage across the traction battery, open one of the pair of switches and close the other of the pair of switches such that charge current from the DC charger electrically connected with the input circuitry flows through the coils and the inverter to the traction battery.
3 . The vehicle of claim 1 further comprising the AC charger.
4 . The vehicle of claim 3 , wherein the one or more controllers are further programmed to, responsive to indication the AC charger is activated, close the pair of switches such that charge current from the AC charger flows through the coils and the inverter to the traction battery.
5 . The vehicle of claim 1 , wherein the input circuitry further includes a connector for the DC charger and a connector for the AC charger.
6 . The vehicle of claim 1 , wherein the capacitor, an anode of the diode, and the pair of switches share a common node.
7 . The vehicle of claim 1 , wherein one of the pair of switches is directly electrically connected with the coils.
8 . The vehicle of claim 1 , wherein the capacitor is electrically in parallel with the DC charger.
9 . A method comprising:
responsive to an indication a DC charger is electrically connected with a vehicle, and a voltage across a capacitor of the vehicle, electrically in parallel with the DC charger and connected at a common node between a pair of series connected switches of the vehicle, is greater than a voltage across a traction battery of the vehicle, opening the pair of switches such that charge current from the DC charger flows through a diode of the vehicle to the traction battery without flowing through coils of an electric machine of the vehicle and a bidirectional boost inverter of the vehicle; and
responsive to the indication and the voltage across the capacitor being less than the voltage across the traction battery, opening one of the pair of switches and closing the other of the pair of switches such that charge current from the DC charger flows through the coils and the inverter to the traction battery.
10 . The method of claim 9 further comprising, responsive to the indication and the voltage across the capacitor being less than the voltage across the traction battery, operating the inverter in a boost mode.
11 . The method of claim 9 further comprising, responsive to indication an AC charger of the vehicle is activated, closing the pair of switches such that charge current from the AC charger flows through the coils and inverter to the traction battery.
12 . The method of claim 11 further comprising operating the inverter in a boost mode.
13 . An automotive power system comprising:
one or more controllers programmed to,
responsive to indication a DC charger is connected and a voltage across a capacitor is less than a voltage across a traction battery, open one of a pair of series connected switches and close another of the pair of switches such that charge current from the DC charger flows through coils of an electric machine and a bidirectional boost inverter to the traction battery, and
responsive to indication an AC charger is activated, close the pair of switches such that charge current from the AC charger flows through the coils and inverter to the traction battery.
14 . The system of claim 13 , wherein the one or more controllers are further programmed to operate the inverter in a boost mode.
15 . The system of claim 13 , wherein the one or more controllers are further programmed to, responsive to indication a DC charger is connected and the voltage across the capacitor is greater than the voltage across the traction battery, open the pair of switches such that charge current from the DC charger flows through a diode to the traction battery without flowing through the coils and the inverter.
16 . The system of claim 15 , wherein an anode of the diode is directly electrically connected with the pair of switches.
17 . The system of claim 13 , wherein one of the pair of switches is directly electrically connected with the coils.