Power supply detecting circuit

Patent metadata

Field	Value
Publication number	US-9740262-B2
Application number	US-201414459941-A
Country	US
Kind code	B2
Filing date	Aug 14, 2014
Priority date	Aug 21, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A power supply detecting circuit includes a first voltage detecting module configured to detect an input voltage of a power supply module; a micro control unit (MCU) connected to the first voltage detecting module; a display module connected to the MCU; a second voltage detecting module configured to detect an output voltage of the power supply module; and a current detecting module configured to detect an output current of the power supply module. The MCU is capable of comparing the detected input voltage, the detected output voltage, and the detected output current of the power supply module with corresponding predetermined parameters and calculating an output power of the power supply module. The display module is capable of displaying the detected input voltage, the detected output voltage, the detected output current, and the output power of the power supply module.

First claim

What is claimed is:

1. A power supply detecting circuit comprising:
a first voltage detecting module, connected to an input terminal of a power supply module, and configured to detect an input voltage of the power supply module;
a micro control unit (MCU) connected to the first voltage detecting module;
a display module connected to the MCU;
a second voltage detecting module, connected to an output terminal of the power supply module, and configured to detect an output voltage of the power supply module; and
a current detecting module, connected to the output terminal of the power supply module, and configured to detect an output current of the power supply module;
wherein the current detecting module comprises a transformer, a second amplifier, and a current detecting circuit; the current detecting circuit comprises a resistor, a capacitor, and two diodes; the transformer is connected to the input terminal of the power supply module; the transformer comprises a secondary coil; the resistor of the current detecting circuit is connected between two output terminals of the secondary coil; the two diodes and the capacitor of the current detecting circuit are capable of rectifying and filtering a signal output by the transformer and sending the rectified and filtered signal to the second amplifier; the MCU is capable of comparing the detected input voltage of the power supply module, the detected output voltage of the power supply module, and the detected output current of the power supply module with corresponding predetermined parameters and calculating an output power of the power supply module; and the display module is capable of displaying the detected input voltage of the power supply module, the detected output voltage of the power supply module, the detected output current of the power supply module, and the output power of the power supply module.

2. The power supply detecting circuit of claim 1 , wherein the second voltage detecting module comprises a voltage detecting unit and a first amplifier connected to the voltage detecting unit; the voltage detecting unit is capable of rectifying and filtering the output voltage of the power supply module, and the first amplifier is capable of amplifying a voltage output by the voltage detecting unit and sending the amplified voltage to the MCU.

3. The power supply detecting circuit of claim 2 , wherein the voltage detecting unit comprises a capacitor and two diodes, the capacitor of the voltage detecting unit is connected to the output terminal of the power supply module and the two diodes of the voltage detecting unit, and the two diodes and capacitor of the voltage detecting unit are capable of rectifying and filtering the output voltage of the power supply module and sending the rectified and filtered voltage to the first amplifier.

4. The power supply detecting circuit of claim 1 , wherein the transformer is connected to an alternating current (AC) power source which supplies the input voltage to the power supply module, the transformer is capable of transforming an input current flowing from the AC power source to the transformer to an output current.

5. The power supply detecting circuit of claim 4 , wherein the transformer further comprises a primary coil, the primary coil is connected to the input terminal of the power supply module.

6. The power supply detecting circuit of claim 1 , wherein the first voltage detecting module comprises a voltage converting circuit and a switch circuit, the voltage converting circuit is connected to the power supply module and capable of rectifying and filtering the input voltage of the power supply module, and the switch circuit is connected between the voltage detecting circuit and the MCU.

7. The power supply detecting circuit of claim 6 , wherein the voltage converting circuit comprises a plurality of capacitors configured to filtering the AC input voltage of the power supply module and a plurality of diodes configured to rectifying the AC input voltage of the power supply module.

8. The power supply detecting circuit of claim 7 , wherein the switch circuit comprises a first transistor and a second transistor, a base terminal of the first transistor is connected to an output terminal of the voltage converting circuit; an emitting terminal of the first transistor is connected to the output terminal of the power supply module, a collector terminal of the first transistor is connected to ground via a first resistor; a base terminal of the second transistor is connected to the collector terminal of the first transistor via a second resistor, a collector terminal of the second transistor is connected to the output terminal of the power supply module via a third resistor, and an emitter terminal of the second transistor is grounded.

9. The power supply detecting circuit of claim 8 , wherein the first transistor is a PNP-type transistor, and the second transistor is an NPN-type transistor.

10. The power supply detecting circuit of claim 1 , further comprising a fourth resistor connected to the output terminal of the power supply module and a switch connected to the fourth resistor.

11. A power supply detecting circuit comprising:
a power supply module capable of converting an alternating current (AC) input voltage supplied by an AC power source to a direct current (DC) output voltage;
a first voltage detecting module, connected to an input terminal of the power supply module, and configured to detect the AC input voltage;
a second voltage detecting module, connected to an output terminal of the power supply module, and configured to detect an output voltage of the power supply module;
a current detecting module, connected to the output terminal of the power supply module, and configured to detect an output current of the power supply module;
a micro control unit (MCU) connected to the first voltage detecting module, the second voltage detecting module, and the current detecting module; and
a display module connected to the MCU;
wherein the current detecting module comprises a transformer, a second amplifier, and a current detecting circuit; the current detecting circuit comprises a resistor, a capacitor, and two diodes; the transformer is connected to the input terminal of the power supply module; the transformer comprises a secondary coil; the resistor of the current detecting circuit is connected between two output terminals of the secondary coil; the two diodes and the capacitor of the current detecting circuit are capable of rectifying and filtering a signal output by the transformer and sending the rectified and filtered signal to the second amplifier; the MCU is capable of comparing the detected input voltage of the power supply module, the detected output voltage of the power supply module, and the detected output current of the power supply module with corresponding predetermined parameters and calculating an output power of the power supply module; and the display module is capable of displaying the detected input voltage of the power supply module, the detected output voltage of the power supply module, the detected output current of the power supply module, and the output power of the power supply module.

12. The power supply detecting circuit of claim 11 , wherein the second voltage detecting module comprises a voltage detecting unit connected to the output terminal of the power supply module and a first amplifier connected to the voltage detecting unit; the voltage detecting unit is capable of rectifying and filtering the output voltage of the power supply module, and the first amplifier is capable of amplifying a voltage output by the voltage detecting unit and sending the amplified

Assignees

• Hon Hai Prec Ind Co Ltd

Inventors

• Lin Ching-Chung

Classifications

• G01R31/40

  Testing power supplies (testing photovoltaic devices H02S50/10) · CPC title

• H02M7/217

  using semiconductor devices only · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• G05F1/573

  with overcurrent detector · CPC title

• G06F1/28

  Supervision thereof, e.g. detecting power-supply failure by out of limits supervision · CPC title