Power converting circuit
A power conversion circuit for supplying power to an inductive load, includes a switching circuit and an energy saving circuit. The inductive load is supplied with electrical power and the energy saving circuit is charged when the switching circuit is conductive, and the inductive load is disconnected from the electrical power supply and the energy stored in the energy saving circuit is discharged to the inductive load when the switching circuit is nonconductive.
1. A power conversion circuit for supplying power to an inductive load, comprising:
a converter for converting an AC voltage to a DC voltage, comprising first and second input terminals for connecting to an AC power supply and first and second DC terminals outputting a DC voltage;
a switching circuit comprising first and second controlled terminals and switchable between a conductive state in which the first and second controlled terminals are connected together and a nonconductive state in which the first and second controlled terminals are disconnected, and a control terminal for controlling the switching of the switching circuit between the conductive and nonconductive states;
a control circuit providing a control signal to switch the switching circuit between the conductive and nonconductive states; and
an energy saving circuit connected to the second controlled terminal and the second DC terminal and comprising first and second output terminals for supplying power to the inductive load, the energy saving circuit storing energy when the switching circuit is conduction and discharging energy to the inductive load when the switching circuit is nonconductive.
2. The power conversion circuit of claim 1 , wherein the control circuit comprises a PWM signal generator.
3. The power conversion circuit of claim 1 , further comprises a filtering circuit connected between the first and second DC terminals.
4. The power conversion circuit of claim 3 , wherein the filtering circuit comprises a first capacitor connected between the first and second DC terminals.
5. The power conversion circuit of claim 1 , wherein the energy saving circuit comprises a diode connected between the second controlled terminal and the second DC terminal and an inductance connected between the second controlled terminal and the first output terminal or between the second DC terminal and the second output terminal.
6. The power conversion circuit of claim 5 , wherein the energy saving circuit further comprises a second capacitor connected between the first and second output terminals.
7. The power conversion circuit of claim 1 , wherein the first and second output terminals are respectively connected to the second controlled terminal and the second DC terminal.
8. The power conversion circuit of claim 7 , wherein the energy saving circuit further comprises an inductance connected between the second controlled terminal and the second DC terminal and a diode connected between the second controlled terminal and the first output terminal or between the second DC terminal and the second output terminal.
9. A power conversion circuit for supplying power to an inductive load, comprising a switching circuit and an energy saving circuit;
wherein the inductive load is supplied with an electrical power and the energy saving circuit is charged when the switching circuit is conductive, and the energy stored in the energy saving circuit is discharged to the inductive load when the switching circuit is nonconductive, and
wherein the switching circuit is connected in series with the energy saving circuit.
10. The power conversion circuit of claim 9 , wherein the inductive load includes an electric motor.
11. The power conversion circuit of claim 9 , wherein the inductive load includes a BLDC motor and the power conversion circuit further comprises an inverter connected between the energy saving circuit and the BLDC motor.
12. The power conversion circuit of claim 11 , wherein the inverter is a H-bridge drive circuit.
13. The power conversion circuit of claim 9 , wherein the switching circuit is connected between a DC voltage and the energy saving circuit.
14. The power conversion circuit of claim 9 , wherein the energy saving circuit is connected between the switching circuit and the inductive load.