Power converter with common DC power source and power supply apparatus having the same
A power converter with a common DC power source includes a DC power source and at least two power modules. Each of the power modules is coupled with each other and coupled to the DC power source. Each of the power module includes a coupled inductive component coupled to the DC power source, a DC output conversion unit coupled to the coupled inductive component, and a capacitor group having a coupling point. By using the coupled inductive component, it is to solve the problem of return current between the power modules caused by coupling multiple coupling points to each other.
1. A power converter with a common DC power source comprising:
a DC power source, and
at least two power modules coupled to the DC power source; each of the power modules is coupled to each other, and each of the power modules comprising:
a coupled inductive component coupled to the DC power source,
a DC output conversion unit coupled to the coupled inductive component, and the DC output conversion unit comprising an input inductor, and
a capacitor group coupled to the DC output conversion unit, the capacitor group having two capacitors coupled in series and a coupling point is between the two capacitors,
wherein the at least two power modules are coupled to each other through the coupling points, and
wherein the coupled inductive component comprises a first input end, a second input end, a first output end, and a second output end; the first input end and the second output end are respectively coupled to the DC power source, the first output end and the second input end are respectively coupled to the DC output conversion unit, wherein a polarity of the first input end is identical to that of the second output end, and a polarity of the second input end is identical to that of the first output end.
2. The power converter with the common DC power source in claim 1 , wherein each of the first input ends is coupled to a positive polarity of the DC power source, and each of the second output ends is coupled to a negative polarity of the DC power source.
3. The power converter with the common DC power source in claim 2 , wherein a current flowing into the first input end is equal to a current flowing out of the second output end.
4. The power converter with the common DC power source in claim 1 , wherein the coupled inductive component is a common mode choke.
5. The power converter with the common DC power source in claim 1 , wherein each of the DC output conversion units comprises:
a first diode and a second diode, the second diode and the first diode are coupled at a first common contact to form a first branch, wherein one end of the input inductor is coupled to the first common contact,
a first power switch and a second power switch, the second power switch and the first power switch are coupled at a second common contact to form a second branch, wherein the second branch is coupled in parallel to the first branch,
a third diode coupled to the first diode and the first power switch, and
a fourth diode is coupled to the second diode and the second power switch.
6. The power converter with the common DC power source in claim 5 , wherein the other end of the input inductor is coupled to the first output end of the coupled inductive component; the second diode, the second power switch, and the fourth diode are coupled to the second input end of the coupled inductive component; the second common contact is coupled to the coupling point; the third diode is coupled between the first power switch and the capacitor group; the fourth diode is coupled between the second power switch and the capacitor group.
7. The power converter with the common DC power source in claim 1 , wherein the DC power source is one of a lithium battery and a lead-acid battery.
8. A power supply apparatus for supplying power to a load, comprising:
a power converter with a common DC power source comprising:
a DC power source,
at least two power modules coupled to the DC power source; each of the power modules is coupled to each other, and each of the power modules comprising:
a coupled inductive component coupled to the DC power source;
a DC output conversion unit coupled to the coupled inductive component, and the DC output conversion unit comprising an input inductor; and
a capacitor group coupled to the DC output conversion unit, the capacitor group having two capacitors coupled in series and a coupling point is between the two capacitors,
wherein the at least two power modules are coupled to each other through the coupling points; and
at least two DC input conversion units, each of the DC input conversion units has an input end and an output end, the input end is correspondingly coupled to each of the DC output conversion units and each of the capacitor groups, and the output end is coupled to the load,
wherein the coupled inductive component comprises a first input end, a second input end, a first output end, and a second output end; the first input end and the second output end are respectively coupled to the DC power source, the first output end and the second input end are respectively coupled to the DC output conversion unit, wherein a polarity of the first input end is identical to that of the second output end, and a polarity of the second input end is identical to that of the first output end.
9. The power supply apparatus in claim 8 , wherein each of the DC input conversion units is correspondingly coupled to each of the coupled inductive components, each of the DC output conversion units and each of the capacitor groups to form a power conversion module, and each of the power conversion modules is coupled in parallel with each other.
10. The power supply apparatus in claim 8 , wherein each of the DC input conversion units is a DC-to-AC converter.
11. The power supply apparatus in claim 10 , wherein each of the coupling points is coupled to a neutral line end of the load.
12. The power supply apparatus in claim 8 , wherein each of the DC input conversion units is a DC-to-DC converter.