Electrical power supply apparatus and controlling method thereof
View Patent ↗Disclosed is an electrical power supply apparatus, comprising a switch circuit, an output circuit, single-direction pass circuit and a control circuit. The output circuit is used for outputting a supply of main power source. The standby circuit is used for providing a supply of standby power source. The control circuit is for being capable of controlling the switch circuit according to a state of the external power source, wherein when the external power source is on, the switch circuit is in a cutoff state for allowing a first period or a second period of a power signal of the external power source transferred to the standby circuit through the single-direction pass circuit.
1. An electrical power supply apparatus, comprising:
a switch circuit;
an output circuit, connected to an external power source, for outputting a supply of main power source;
a standby circuit, connected to the external power source and the output circuit, for providing a supply of standby power source;
a single-direction pass circuit, connected to the external power source, the output circuit and the standby circuit; and
a control circuit, connected to the external power source, the control circuit controlling a conduction state of the switch circuit according to a state of the external power source,
wherein when the external power source is on, the switch circuit is in a cutoff state for allowing a first period or a second period of a power signal of the external power source transferred to the standby circuit through the single-direction pass circuit.
2. The electrical power supply apparatus according to claim 1 , further comprising:
a rectifying circuit, connected between the switch circuit and the output circuit;
wherein when the output circuit is in a conduction state and the external power source is on, the switch circuit is in the conduction state for allowing the first period or the second period of the power signal of the external power source transferred to the output circuit through the single-direction pass circuit or the rectifying circuit.
3. The electrical power supply apparatus according to claim 2 , wherein the single-direction pass circuit includes:
A first diode, connected to the external power source by way of an anode terminal thereof, connected to the output circuit and the standby circuit by way of cathode terminal thereof, for allowing the first period or the second period of the power signal of the external power source transferred to the output circuit and the standby circuit.
4. The electrical power supply apparatus according to claim 3 , wherein the first period is a positive half cycle period, the second period is a negative half cycle period, and the external power signal is an AC power signal.
5. The electrical power supply apparatus according to claim 1 , wherein the control circuit includes:
a first transistor, connected to the external power source by way of a control terminal thereof, for being controlled by the power signal from the external power source;
a second transistor, connected to a first terminal of the first transistor by way of a control terminal thereof, for being cutting off in response to the conduction of the first transistor;
a third transistor, connected to a first terminal of the second transistor by way of a control terminal thereof, for being cutting off in response to the cutoff of the second transistor; and
a first DC power source, connected to a first terminal of the third transistor, for controlling the switch circuit by the third transistor.
6. The electrical power supply apparatus according to claim 1 , further including:
a discharge circuit, connected between the output circuit and the external power source, for discharging an external capacitor parallel to the external power source by means of controlling the discharge circuit to be in a conduction state by the control circuit as the external power source is being removed.
7. The electrical power supply apparatus according to claim 6 , wherein the discharge circuit includes:
a fourth transistor, connected to the third transistor by way of a control terminal thereof, for conducting in response to the conduction of the third transistor; and
a resistor, connected to a first terminal of the fourth transistor by way of a first terminal thereof, connected to the output circuit by way of a second terminal thereof.
8. The electrical power supply apparatus according to claim 5 , wherein the control circuit further includes:
a fifth transistor, connected to the control terminal of the second transistor by way of a first terminal thereof;
a sixth transistor, connected to the control terminal of the first transistor by way of a control terminal thereof, connected to a ground voltage and a second terminal of the first transistor by way of a second terminal thereof,
connected to a control terminal of the fifth transistor by way of a first terminal thereof; and
a second DC power source, connected to the ground voltage by way of a negative terminal thereof, connected to the first terminal of the fifth transistor by way of a positive terminal thereof.
9. The electrical power supply apparatus according to claim 8 , wherein if the external power signal is during the second period as the external power source is removed, the first transistor and the sixth transistor maintain in a conduction state, the fifth transistor is in a cutoff state, the second DC power source drives the second transistor to be conducted, and then the third transistor is conducted, such that the second DC power source drives the discharge circuit and the switch circuit to be conducted by way of the third transistor.
10. The electrical power supply apparatus according to claim 8 , wherein if the external power signal is during the first period as the external power source is removed, the first transistor and the sixth transistor are in a cutoff state, the fifth transistor is in a conduction state, the first DC power source drives the second transistor to be conducted, and then the third transistor is conducted, such that the second DC power source drives the discharge circuit and the switch circuit to be conducted by way of the third transistor.
11. A controlling method of an electrical power supply apparatus, comprising the steps of:
transferring a power signal to a output circuit through a single-direction pass circuit or a rectifying circuit when the electrical power supply apparatus is in a normal operating mode; and
controlling a switch circuit by way of a control circuit when the electrical power supply apparatus is in a standby operating mode, such that a first period or a second period of the power signal is transferred to a standby circuit through the single-direction pass circuit.
12. The controlling method according to claim 11 , further including the steps of:
the control circuit conducts a discharge circuit and the switch circuit when an external power source is removed, such that an external capacitor connected with the external power source in parallel is discharged by means of the discharge circuit.
13. The controlling method according to claim 11 , further including the steps of:
when the external power source is on, the switch circuit is in a cutoff state for allowing a first period or a second period of the power signal of the external power source transferred to the standby circuit through the single-direction pass circuit.
14. The controlling method according to claim 11 , further including the steps of:
wherein when the output circuit is in a conduction state and the external power source is on, the switch circuit is in the conduction state for allowing the first period or the second period of the power signal of the external power source transferred to the output circuit through the single-direction pass circuit or the rectifying circuit.
15. The controlling method according to claim 11 , wherein the single-direction pass circuit includes:
A first diode, connected to the external power source by way of an anode terminal thereof, connected to the output circuit and the standby circuit by way of cathode terminal thereof, for allowing the first period or the second period of the power signal of the external power source transferred to the output circuit and the standby circuit.
16. The controlling method according to claim 12 , wherein the control circuit includes:
a first transistor, connected to the external power source by way of a control terminal thereof, for being controlled by the power signal from the external power source;
a second transistor, connected to a first terminal of the first transistor by way of a control terminal thereof, for being cutting off in response to the conduction of the first transistor;
a third transistor, connected to a first terminal of the second transistor by way of a control terminal thereof, for being cutting off in response to the cutoff of the second transistor; and
a first DC power source, connected to a first terminal of the third transistor, for controlling the switch circuit by the third transistor.
17. The controlling method according to claim 12 , wherein the discharge circuit includes:
a fourth transistor, connected to the third transistor by way of a control terminal thereof, for conducting in response to the conduction of the third transistor; and
a resistor, connected to a first terminal of the fourth transistor by way of a first terminal thereof, connected to the output circuit by way of a second terminal thereof.
18. The controlling method according to claim 16 , wherein the control circuit further includes:
a fifth transistor, connected to the control terminal of the second transistor by way of a first terminal thereof;
a sixth transistor, connected to the control terminal of the first transistor by way of a control terminal thereof, connected to a ground voltage and a second terminal of the first transistor by way of a second terminal thereof, connected to a control terminal of the fifth transistor by way of a first terminal thereof; and
a second DC power source, connected to the ground voltage by way of a negative terminal thereof, connected to the first terminal of the fifth transistor by way of a positive terminal thereof.
19. The controlling method according to claim 18 , wherein if the external power signal is during the second period as the external power source is removed, the first transistor and the sixth transistor maintain in a conduction state, the fifth transistor is in a cutoff state, the second DC power source drives the second transistor to be conducted, and then the third transistor is conducted, such that the second DC power source drives the discharge circuit and the switch circuit to be conducted by way of the third transistor.
20. The controlling method according to claim 18 , wherein if the external power signal is during the first period as the external power source is removed, the first transistor and the sixth transistor are in a cutoff state, the fifth transistor is in a conduction state, the first DC power source drives the second transistor to be conducted, and then the third transistor is conducted, such that the second DC power source drives the discharge circuit and the switch circuit to be conducted by way of the third transistor.