Power converting circuit
A power converting circuit for supplying power to an inductive load, includes an inductance, a switching circuit and an energy saving circuit. The inductance is charged when the switching circuit is conductive and discharges energy to the energy saving circuit and the inductive load when the switching circuit is nonconductive. The energy saving circuit discharges energy to the inductive load when the switching circuit is conductive.
1. A power converting circuit for supplying power to an inductance load, comprising:
a converter for converting an AC voltage to a DC voltage, comprising first and second input terminals adapted to connect to an AC power supply and first and second DC terminals for outputting a DC voltage;
a first inductance comprising first and second connecting terminals, the first connecting terminal being connected to the first DC terminal;
a switching circuit comprising first and second controlled terminals and a control terminal for controlling a connection between the first and second controlled terminals;
a control circuit supplying a control signal the control terminal to control the connection between the first controlled terminal and the second controlled terminal; and
an energy saving circuit connected to the second connecting terminal and the second DC terminal and comprising first and second output terminals for supplying power to the inductive load;
wherein the first inductance is adapted to store energy when the first and second controlled terminals are connected to each other and to discharge energy to the energy saving circuit and the inductive load when the first and second controlled terminals are disconnected from each other, and the energy saving circuit is adapted to discharge energy to the inductive load when the first and second controlled terminals are connected to each other.
2. The power converting circuit of claim 1 , wherein the control circuit comprises a PWM signal generator.
3. The power converting circuit of claim 1 , further comprises a filtering circuit connected between the first and second DC terminals.
4. The power converting circuit of claim 3 , wherein the filtering circuit comprises a first capacitor connected between the first and second DC terminals.
5. The power converting circuit of claim 4 , wherein the energy saving circuit comprises a second capacitor connected between the first and second output terminals.
6. The power converting circuit of claim 5 , wherein the energy saving circuit further comprises a diode, one of the first and second output terminals being connected to one of the second connecting terminal and the second DC terminal via the diode, and the other one of the first and second output terminals being directly connected to the other one of the second connecting terminal and the second DC terminal.
7. The power converting circuit of claim 5 , wherein the energy saving circuit further comprises a third capacitor connected between the second connecting terminal and the first output terminal and a second inductance connected between the second DC terminal and one end of the third capacitor adjacent the first output terminal.
8. The power converting circuit of claim 7 , wherein the energy saving circuit further comprises a diode, one of the first and second output terminals being connected to one of the second DC terminal and one end of the third capacitor adjacent the first output terminal via the diode, the other one of the first and second output terminals being connected to the other one of the second DC terminal and one end of the third capacitor adjacent the first output terminal.
9. A power converting circuit for supplying power to an inductive load, comprising an inductance, a switching circuit and an energy saving circuit;
wherein the inductance is connected between a DC voltage and the switching circuit;
wherein the inductance is charged when the switching circuit is conductive and discharges energy to the energy saving circuit and the inductive load when the switching circuit is nonconductive, and the energy saving circuit discharges energy to the inductive load when the switching circuit is conductive.
10. The power converting circuit of claim 9 , wherein the switching circuit is connected in parallel with the energy saving circuit.
11. The power converting circuit of claim 9 , wherein the inductive load includes an electric motor.
12. The power converting circuit of claim 9 , wherein the inductive load includes a BLDC motor and the power converting circuit further comprises an inverter connected between the energy saving circuit and the BLDC motor.
13. The power converting circuit of claim 12 , wherein the inverter is a H-bridge drive circuit.
14. The power converting circuit of claim 9 , wherein the energy saving circuit is connected between the switching circuit and the inductive load.