Integrated DC/DC and AC/DC converter system
Provided is an integrated DC/DC and AC/DC converter system including a main relay selectively connected to any one of an AC power supply unit and a DC power supply unit and a controller connecting the main relay to the AC power supply unit or the DC power supply unit. Electrical energy based on the AC power output from the AC power supply and electrical energy based on DC power output from the DC power supply unit may be selectively provided to a load.
1. An integrated DC/DC and AC/DC converter system comprising:
a first inductor having one end connected to an AC power supply unit;
a second inductor having one end connected to a DC power supply unit;
a first switch having one end connected to the other end of the first inductor and the other end of the second inductor;
a second switch having one end connected to the other end of the first inductor, the other end of the second inductor, and the one end of the first switch;
a main relay having one end connected to the other end of the first switch and the other end of the second switch and the other end selectively connected to any one of the AC power supply unit and the DC power supply unit;
a controller controlling a switching operation of the first switch, the second switch, and the main relay to provide, to a load, an AC power-based electrical energy output from the AC power supply unit or a DC power-based electrical energy output from the DC power supply unit;
a link capacitor having one end connected to the other end of the first switch and the other end connected to the other end of the second switch, and storing the AC power-based electrical energy output from the AC power supply unit or the DC power-based electrical energy output from the DC power supply unit according to the switching operation controlled by the controller;
an inverter converting a link voltage of an electrical energy stored in the link capacitor into an AC voltage;
a transformer transforming the AC voltage converted by the inverter;
an AC-DC converter unit converting the AC voltage transformed by the transformer into a DC voltage and providing the DC voltage to the load;
a first sub-relay having one end connected to the one end of the link capacitor and the other end selectively connected to any one of the inverter and one end of a bypass path; and
a second sub-relay having one end connected to one end of the load and the other end selectively connected to any one of the rectifier and the other end of the bypass path,
wherein the load is provided with electrical energy stored in the link capacitor, and
wherein;
when the controller connects the other end of the main relay to the AC power supply unit, the controller connects the other end of the first sub-relay to the inverter and connects the other end of the second sub-relay to the rectifier, so that the electrical energy is provided to the load in a state in which the link voltage of the electrical energy stored in the link capacitor is converted by the AC-DC converter unit, and
when the controller connects the other end of the main relay to the DC power supply unit, the controller connects the other end of the first sub-relay to the one end of the bypass path and connects the other end of the second sub-relay to the other end of the bypass path, so that the electrical energy is provided to the load in a state in which the link voltage of the electrical energy stored in the link capacitor is not converted by the AC-DC converter unit.
2. The integrated DC/DC and AC/DC converter system of claim 1 , wherein the controller connects the other end of the main relay to the AC power supply unit and alternately turns the first switch and the second switch on or off so that the AC power-based electrical energy output from the AC power supply unit is provided to the load.
3. The integrated DC/DC and AC/DC converter system of claim 1 , wherein the controller connects the other end of the main relay to the DC power supply unit and alternately turns the first switch and the second switch on or off so that the DC power-based electrical energy output from the DC power supply unit is provided to the load.
4. The integrated DC/DC and AC/DC converter system of claim 3 , wherein the controller controls a duty ratio of the first switch and the second switch so that DC power generated by the DC power supply unit is maximized according to a temperature of the DC power supply unit and an amount of insolation incident on the DC power supply unit.
5. The integrated DC/DC and AC/DC converter system of claim 1 , further comprising:
a first diode including an anode electrode connected to the one end of the main relay and a cathode electrode connected to the other end of the first switch; and
a second diode including an anode electrode connected to the other end of the second switch and a cathode electrode connected to the one end of the main relay.
6. The integrated DC/DC and AC/DC converter system of claim 1 , wherein the first inductor and the second inductor share the same core and are magnetically coupled to each other.
7. The integrated DC/DC and AC/DC converter system of claim 1 , wherein the main relay, the first sub-relay, and the second sub-relay are implemented as a 3-pole double-through (3PDT) relay.