Electronic system sharing power with doorbell and power-supply method thereof
An electronic system sharing power of a doorbell includes a switch circuit and an electronic device. The first and second connection terminals of the switch circuit are respectively coupled to two doorbell contacts. The second and third connection terminals of the switch circuit are respectively coupled to two ends of a doorbell. Two power terminals of the electronic device are respectively coupled to two switch contacts. A function circuit of the electronic device is coupled between the two power terminals. In a normal mode, the first connection terminal is conducted to the second connection terminal inside the switch circuit, and the two power terminals are disconnected from each other by a doorbell actuating unit of the electronic device. In a ringing mode, the doorbell actuating unit short-circuits the two power terminals, and the first connection terminal is conducted to the third connection terminal inside the switch circuit.
1. An electronic system sharing power with a doorbell, comprising:
a switch circuit, comprising:
a first connection terminal, configured to be coupled to a first doorbell contact;
a second connection terminal, configured to be coupled to a second doorbell contact, wherein the second doorbell contact is further coupled to a first end of a doorbell; and
a third connection terminal, configured to be coupled to a second end of the doorbell; and
an electronic device, comprising:
a first power terminal, configured to be coupled to a first switch contact;
a second power terminal, configured to be coupled to a second switch contact;
a doorbell actuating unit, coupled between the first switch contact and the second switch contact; and
a function circuit, coupled between the first power terminal and the second power terminal, and configured to provide a functional operation;
wherein in a normal mode, the first connection terminal is conducted to the second connection terminal inside the switch circuit, and the first power terminal is disconnected from the second power terminal by the doorbell actuating unit; and
wherein in a ringing mode, the doorbell actuating unit forms a short circuit between the first power terminal and the second power terminal, and the first connection terminal is conducted to the third connection terminal inside the switch circuit.
2. The electronic system sharing power with the doorbell according to claim 1 , wherein the switch circuit further comprises:
a relay, having a common terminal, a normally-closed terminal, and a normally-open terminal, wherein the common terminal is coupled to the first connection terminal, the normally-closed terminal is coupled to the second connection terminal, and the normally-open terminal is coupled to the third connection terminal;
wherein in the normal mode, the common terminal is conducted to the normally-closed terminal inside the relay, and wherein in the ringing mode, the common terminal is conducted to the normally-open terminal inside the relay.
3. The electronic system sharing power with the doorbell according to claim 1 , wherein the switch circuit further comprises:
a rectifying circuit, wherein a first end of the rectifying circuit is coupled to the first connection terminal;
a first light emitting element, coupled between a second end of the rectifying circuit and a ground;
a second light emitting element, coupled between the second end of the rectifying circuit and the ground;
a first light receiving element, coupled between the first connection terminal and the second connection terminal, wherein the first light receiving element is controlled by the first light emitting element; and
a second light receiving element, coupled between the first connection terminal and the third connection terminal, wherein the second light receiving element is controlled by the second light emitting element.
4. The electronic system sharing power with the doorbell according to claim 3 , wherein the switch circuit further comprises:
a current-limiting impedance, coupled between the first light emitting element and the second connection terminal.
5. The electronic system sharing power with the doorbell according to claim 4 wherein the switch circuit further comprises:
a voltage regulating element, coupled to the second end of the rectifying circuit.
6. The electronic system sharing power with the doorbell according to claim 3 , wherein the switch circuit further comprises:
a filtering circuit, coupled to the second end of the rectifying circuit.
7. The electronic system sharing power with the doorbell according to claim 6 , wherein the switch circuit further comprises:
a current-limiting impedance, coupled between the first light emitting element and the second connection terminal.
8. The electronic system sharing power with the doorbell according to claim 7 , wherein the switch circuit further comprises:
a voltage regulating element, coupled to the second end of the rectifying circuit.
9. The electronic system sharing power with the doorbell according to claim 3 , wherein the switch circuit further comprises:
an impedance element, coupled between the second end of the rectifying circuit and the first light emitting element, wherein the first light emitting element and the second light emitting element are forward connected between the impedance element and the ground in a same voltage direction.
10. The electronic system sharing power with the doorbell according to claim 9 , wherein the switch circuit further comprises:
a current-limiting impedance, coupled between the first light emitting element and the second connection terminal.
11. The electronic system sharing power with the doorbell according to claim 10 , wherein the switch circuit further comprises:
a voltage regulating element, coupled to the second end of the rectifying circuit.
12. The electronic system sharing power with the doorbell according to claim 3 , wherein the switch circuit further comprises:
a first impedance element, coupled between the second end of the rectifying circuit and a first end of the first light emitting element, wherein a second end of the first light emitting element is coupled to the ground; and
a second impedance element, coupled between the second end of the rectifying circuit and a first end of the second light emitting element, wherein a second end of the second light emitting element is coupled to the ground.
13. The electronic system sharing power with the doorbell according to claim 12 , wherein the switch circuit further comprises:
a current-limiting impedance, coupled between the first light emitting element and the second connection terminal.
14. The electronic system sharing power with the doorbell according to claim 13 , wherein the switch circuit further comprises:
a voltage regulating element, coupled to the second end of the rectifying circuit.
15. A power-supply method for sharing power with a doorbell, comprising:
normally conducting a first power supply loop by a switch circuit and breaking a second power supply loop by the switch circuit, so that a power supply is supplied to an electronic device through the first power supply loop and a doorbell is kept in an open-circuited state through the second power supply loop;
forming a short circuit between two power terminals of the electronic device; and
when the short circuit is formed, switching the switch circuit to break the first power supply loop and conduct the second power supply loop, so that the power supply is supplied to the doorbell through the second power supply loop.
16. The power-supply method for sharing power with the doorbell according to claim 15 , wherein the step of switching the switch circuit to break the first power supply loop and conduct the second power supply loop comprises:
generating a driving current according to the power supply; and
driving the switch circuit to be switched by the driving current.