Anti-leakage supply circuit

Patent metadata

Field	Value
Publication number	US-2016197548-A1
Application number	US-201514600724-A
Country	US
Kind code	A1
Filing date	Jan 20, 2015
Priority date	Jan 6, 2015
Publication date	Jul 7, 2016
Grant date	—

Abstract

An anti-leakage supply circuit includes a power supply unit, an output unit, a control unit, and a control circuit. The control unit is configured to output a control signal. The output unit is configured to be switched on after receiving the control signal and to output an output voltage after being switched on and receiving a voltage from the power supply unit. The control circuit is configured to be switched on after an electronic device is in a normal state. The output unit is configured to connect to the interface after the control circuit is switched on, thereby enabling the output unit to output the output voltage to supply to an interface. The control circuit is further configured to be switched off after the electronic device is in a shutdown state, thereby disabling the output voltage supply to the interface.

First claim

What is claimed is:

1 . An anti-leakage supply circuit comprising:
a power supply unit configured to supply a supply voltage; an output unit coupled to the power supply unit; a control unit coupled to the output unit; and a control circuit couplable to an interface and the output unit; wherein the control unit is configured to output a control signal; wherein the output unit is configured to be switched on upon receiving the control signal, and to output an output voltage after being switched on and receiving the supply voltage; wherein the output unit is also configured to output an output voltage after being switched on and receiving the supply voltage; wherein the control circuit is further configured to be switched on after an electronic device is in a normal state; wherein the output unit is further configured to connect to the interface after the control circuit is switched on, thereby enabling the output unit to output the output voltage to supply to the interface; and wherein the control circuit is further configured to be switched off after the electronic device is in a shutdown state, thereby disabling the output voltage from the output unit to the interface.

2 . The supply circuit of claim 1 , wherein the control circuit comprises a switch member, one end of the switch member is coupled to the output unit, the other end of the switch member is configured to couple to the interface, and the switch member is configured to disconnect the output unit and the interface when the electronic device is shutdown.

3 . The supply circuit of claim 2 , wherein the output unit comprises an output terminal coupled to a first node and the first node is coupled to one end of the switch member.

4 . The supply circuit of claim 3 , wherein the switch member is a silicon diode, the first node is coupled to an anode of the silicon diode, and the cathode of the silicon diode is configured to couple to the interface.

5 . The supply circuit of claim 4 , wherein the control circuit further comprises a fuse, the first node is coupled to one end of the fuse, and the other end of the fuse is coupled to the anode of silicon diode.

6 . The supply circuit of claim 5 , wherein one end of the fuse is grounded via a first capacitor, the other end of the fuse is grounded via a second capacitor.

7 . The supply circuit of claim 6 , wherein the anode of the silicon diode is grounded via the second capacitor.

8 . The supply circuit of claim 3 , wherein the output unit further comprises an input terminal coupled to a second node and the second node is coupled to the power supply unit.

9 . The supply circuit of claim 3 , wherein the control unit comprises a power supply and the output unit further comprises a control terminal coupled to the power supply via a first resistor.

10 . The supply circuit of claim 9 , wherein the control terminal of the output unit is grounded via a second resistor.

11 . An anti-leakage supply circuit being used in an electronic device and comprising:
an interface; a power supply unit configured to supply a supply voltage; an output unit coupled to the power supply unit; a control unit coupled to the output unit; and a control circuit coupled to the output unit and the interface; wherein the control unit is configured to output a control signal; wherein the output unit is configured to be switched on upon receiving the control signal; wherein the output unit is also configured to output an output voltage after being switched on and receiving the supply voltage; wherein the control circuit is configured to be switched on after the electronic device is in a normal state; wherein the output unit is configured to connect to the interface after the control circuit is switched on, thereby the output unit outputs the output voltage to supply to the interface; and wherein the control circuit is further configured to be switched off after the electronic device is in a shutdown state, thereby disabling the output voltage from the output unit to the interface.

12 . The supply circuit of claim 11 , wherein the control circuit comprises a switch member, one end of the switch member is coupled to the output unit, the other end of the switch member is coupled to the interface, and the switch member is configured to disconnect the output unit and the interface when the electronic device is shutdown.

13 . The supply circuit of claim 12 , wherein the output unit comprises two output terminals coupled to a first node and the first node is coupled to one end of the switch member.

14 . The supply circuit of claim 13 , wherein the switch member is a silicon diode, the first node is coupled to an anode of the silicon diode, and the cathode of the silicon diode is configured to couple to the interface.

15 . The supply circuit of claim 14 , wherein the control circuit further comprises a fuse, the first node is coupled to one end of the fuse, and the other end of the fuse is coupled to the anode of silicon diode.

16 . The supply circuit of claim 15 , wherein one end of the fuse is grounded via a first capacitor, the other end of the fuse is grounded via a second capacitor.

17 . The supply circuit of claim 11 , wherein the output unit is a switch and a type of the output unit is TPS2296.

18 . The supply circuit of claim 11 , wherein the interface is a HDMI interface.

19 . The supply circuit of claim 13 , wherein the output unit further comprises two input terminals coupled to a second node and the second node is coupled to the power supply unit.

20 . The supply circuit of claim 13 , wherein the control unit comprises a power supply and the output unit further comprises a control terminal coupled to the power supply via a resistor.

Assignees

• Hongfujin Prec Ind Wuhan
• Hon Hai Prec Ind Co Ltd

Inventors

• Chang Gui
• Chen Chun-Sheng

Classifications

• H02M3/04 Primary

  by static converters · CPC title

• G06F1/26 Primary

  Power supply means, e.g. regulation thereof (for memories G11C) · CPC title