Electronic system sharing power with doorbell and power-supply method thereof

Patent metadata

Field	Value
Publication number	US-2018190083-A1
Application number	US-201715610856-A
Country	US
Kind code	A1
Filing date	Jun 1, 2017
Priority date	Dec 30, 2016
Publication date	Jul 5, 2018
Grant date	—

Abstract

An electronic system sharing power with doorbell includes two power contacts, an AC switch, a first AC/DC conversion circuit, a DC switch, an electronic device, and a doorbell-driving device. The first AC/DC conversion circuit receives an AC power via the power contacts and generates a DC power according to the AC power. In a normal state, the AC switch is off and the DC switch is on. Therefore, the electronic device is powered by the DC power. When the electronic device receives an enabling signal, the electronic device controls the AC switch to be on, to cause the voltage of the doorbell contacts to change from a low voltage to a high voltage. The doorbell-driving device detects the voltage of the doorbell contacts and supplies the power to a doorbell according to the detected voltage.

First claim

What is claimed is:

1 . An electronic system sharing power with doorbell, comprising:
two power contacts, adapted to be coupled to two switch contacts, respectively; an alternate current (AC) switch, coupled between the two power contacts, wherein the AC switch is normal off; a first alternate current/direct current (AC/DC) conversion circuit, connected in parallel between the two power contacts together with the AC switch, and configured to receive an AC power via the two power contacts and generate a DC power according to the AC power; a DC switch, one end of the DC switch coupled to the first AC/DC conversion circuit, wherein the DC switch is configured to receive the DC power and the DC switch is normally on; an electronic device, coupled to another end of the DC switch, control end of the AC switch, and control end of the DC switch, and configured to provide a functional operation and to control the AC switch to be on according to an enabling signal, wherein the electronic device is powered with the DC power; and a doorbell-driving device, adapted to couple to two doorbell contacts and a doorbell, and configured to detect a voltage difference of the two doorbell contacts and to supply power to the doorbell according to the detected voltage, wherein one of the two doorbell contacts is coupled to one of the two switch contacts.

2 . The electronic system sharing power with doorbell according to claim 1 , wherein when the AC switch is off and the DC switch is on, the voltage difference of the doorbell contacts is a low voltage and the doorbell-driving device does not supply power to the doorbell; and wherein when the AC switch is on and the DC switch is on, the voltage difference of the doorbell contacts is a high voltage and the doorbell-driving device supplies power to the doorbell.

3 . The electronic system sharing power with doorbell according to claim 2 , wherein when the AC switch has been on for a predetermined time, the electronic device controls the AC switch to be off and controls the DC switch to be off, to cause the voltage difference of the two doorbell contacts to be zero so as to disable the doorbell-driving device, and wherein when the doorbell-driving device is restarted, the doorbell-driving device is reset to be a normal state.

4 . The electronic system sharing power with doorbell according to claim 1 , wherein the doorbell-driving device comprises:
a load unit, one end of the load unit coupled to one of the two doorbell contacts; a path-switching unit, coupled to another end of the load unit, the other of the two doorbell contacts, and the doorbell, and configured to connect the other doorbell contact to the load unit or the doorbell, wherein the patch switching unit normally connects the other doorbell contact to the load unit; a second AC/DC conversion circuit, adapted to be coupled between the two doorbell contacts, and configured to receive the voltage difference between the two doorbell contacts and generate a DC voltage according to the voltage difference; and a voltage detection circuit, coupled to the second AC/DC conversion circuit, and configured to receive the DC voltage and control the switching of the path-switching unit according to the value of the DC voltage.

5 . The electronic system sharing power with doorbell according to claim 4 , wherein when the AC switch is off and the DC switch is on, the voltage difference is a low voltage and the path-switching unit connects the other doorbell contact to the load unit, such that the doorbell-driving device does not supply power to the doorbell; and wherein when the AC switch is on and the DC switch is on, the voltage difference is a high voltage and the voltage detection circuit controls the path-switching unit to connect the other doorbell contact to the doorbell, such that the doorbell-driving device supplies power to the doorbell.

6 . The electronic system sharing power with doorbell according to claim 5 , wherein when the AC switch has been on for a predetermined time, the electronic device controls the AC switch and the DC switch to be off, to cause the voltage difference to be zero so as to disable the voltage detection circuit, and wherein when the voltage detection circuit is restarted, the voltage detection circuit resets the path-switching unit to be a normal state.

7 . The electronic system sharing power with doorbell according to claim 1 , further comprising:
an energy storage unit, coupled to a node between the DC switch and the electronic device.

8 . The electronic system sharing power with doorbell according to claim 7 , wherein when the AC switch and the DC switch are off, the energy storage unit discharges power to supply power to the electronic device.

9 . The electronic system sharing power with doorbell according to claim 1 , further comprising:
a doorbell actuator, coupled to the electronic device, and configured to generate the enabling signal.

10 . A power-supply method for sharing power with doorbell, comprising:
receiving an alternate current (AC) power via two switch contacts; generating a direct current (DC) power according to the AC power; supplying the DC power to an electronic device via a DC switch; generating a control signal according to an enabling signal generated by a doorbell actuator; connecting the two switch contacts to each other in response to the control signal to change a voltage difference between two doorbell contacts from a low voltage to a high voltage; detecting the voltage difference between the two doorbell contacts; dis-driving a doorbell when the voltage difference is detected to be the low voltage; and driving the doorbell according to the voltage difference when the voltage difference is detected to be the high voltage.

11 . The power-supply method for sharing power with doorbell according to claim 10 , further comprising:
charging an energy storage unit according to the DC power; and when the DC switch is off, supplying power to the electronic device by the energy storage unit.

12 . The power-supply method for sharing power with doorbell according to claim 10 , further comprising:
when the two switch contacts have been connected to each other for a predetermined time, switching the two switch contacts to be off and switching the DC switch to be off, to cause the voltage difference to be zero so as to disable the detection step; and after the detection step is disabled, switching the DC switch to be on to change the voltage difference from zero to the low voltage so as to restart the detection step.

13 . The power-supply method for sharing power with doorbell according to claim 10 , further comprising:
connecting one of the two doorbell contacts to one end of a load unit or the doorbell by a path-switching unit, wherein the other of the two doorbell contacts is coupled to another end of the load unit, and the one doorbell contact is normally connected to the one end of the load unit; and controlling the switching of the path-switching unit according to a DC voltage; wherein the detecting step comprises receiving the voltage difference between the two doorbell contacts and generating the DC voltage according to the voltage difference.

14 . The power-supply method for sharing power with doorbell according to claim 13 , wherein when the two switch contacts are not connected to each other and the DC switch is on, the path-switching unit connects the one doorbell contact to the load unit in the connecting step of the one doorbell contact, to perform the dis-driving step, and when the two switch contacts are connected to each other and the DC switch is

Assignees

• Chicony Electronics Co Ltd

Inventors

• Wu Jui-Ching

Classifications

• H02J3/02 Primary

  using a single network for simultaneous distribution of AC power at different frequencies · CPC title

• G08B3/10 Primary

  using electric transmission; using electromagnetic transmission · CPC title

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H02M1/0006

  Arrangements for supplying an adequate voltage to the control circuit of converters · CPC title