A power supply device (1) converting received power signals to direct current signals to ensure a load to work normally. The power supply device includes a transformer circuit (10), a rectifier circuit (11), and an inrush current control circuit (12). The transformer circuit converts the received power signals to alternating current signals. The rectifier circuit is connected to the transformer circuit, and converts the alternating current signals to direct current signals. The inrush current control circuit is connected to the rectifier circuit, for limiting inrush current from the power supply device. The inrush current control circuit includes a voltage divider resistor (R1) and a filter capacitor (C1). The filter capacitor is connected to the voltage divider resistor in series. In the invention, the power supply device uses the inrush current control circuit to limit the inrush current, thus life of the components is lengthened, and the power supply device is stable.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a power supply device of an exemplary embodiment of the present invention;
FIG. 2 is a detail circuit diagram of FIG. 1 of the present invention; and
FIG. 3 is a waveform diagram of a power supply device of FIG. 2.
Claims
1. A power supply device, for converting received power signals to direct current signals to a load, comprising:
a transformer circuit, for converting the received power signals to alternating current signals;a rectifier circuit, connected to the transformer circuit, for converting the alternating current signals to direct current signals; andan inrush current control circuit, connected to the rectifier circuit, for limiting inrush current from the power supply device, comprising:a voltage divider resistor; anda filter capacitor, connected to the voltage divider resistor in series.
2. The power supply device as claimed in claim 1, wherein the transformer circuit comprises a transformer comprising a primary winding and a secondary winding; the primary winding is an input of the power supply device for receiving power signals, and the secondary winding is connected to the rectifier circuit.
3. The power supply device as claimed in claim 2, wherein the rectifier circuit comprises:
a first diode;a second diode, wherein an anode of the second diode and a cathode of the first diode are jointly connected to a high voltage terminal of the secondary winding of the transformer;a third diode, wherein a cathode of the third diode is connected to a cathode of the second diode; anda fourth diode, wherein a cathode of the fourth diode and an anode of the third diode are jointly connected to a low voltage terminal of the secondary winding of the transformer, and an anode of the fourth diode is connected to an anode of the first diode.
4. The power supply device as claimed in claim 3, wherein the filter capacitor and the voltage divider resistor are connected between the anode of the first diode and the cathode of the second diode.
5. The power supply device as claim in claim 3, wherein the load comprises a storage capacitor, connected between the anode of the first diode and the cathode of the second diode.
6. The power supply device as claimed in claim 1, wherein the rectifier circuit is a full-bridge rectifier circuit or a half-bridge rectifier circuit.
7. The power supply device as claimed in claim 1, wherein a range of the resistance of the voltage divider resistor is from 0 to 1.5 ohm.
8. A power supply device for powering a load, comprising:
a power source providing power signals;a transformer circuit electrically connectable with said power source so as to convert said power signals received from said power source to alternating current signals;a rectifier circuit electrically connectable with said transformer circuit to accept said alternating current signals, and to further convert said alternating current signals to direct current signals;a capacitor electrically connectable between said rectifier circuit and a load to accept said direct current signals from said rectifier circuit, and to further filter said direct current signals for outputting to said load; andat least one resistor electrically and serially connectable with said capacitor.
9. The power supply device as claimed in claim 8, wherein said rectifier circuit is a selective one of a full-bridge rectifier circuit and a half-bridge rectifier circuit.
10. A circuit assembly comprising:
a load to be powered;a power source providing power signals for said load;a transformer circuit electrically connectable between said power source and said load to convert said power signals from said power source to alternating current signals;a rectifier circuit electrically connectable between said transformer circuit and said load to convert said alternating current signals from said transformer circuit to direct current signals; andan inrush current control circuit electrically connectable between said rectifier circuit and said load to filter said direct current signals before said filtered direct current signals are output to said load, said inrush current control circuit comprising at least one resistor to increase equivalent impedance of said inrush current control circuit for outputting.
11. The circuit assembly as claimed in claim 10, wherein said inrush current control circuit comprises a capacitor to filter said direct current signals for outputting, and said at least one resistor is electrically and serially connectable with said capacitor in said inrush current control circuit.
Patent Application
20070223260
