Power detecting circuit

• US 9,651,588 B2
• Filed: 09/17/2014
• Issued: 05/16/2017
• Est. Priority Date: 09/17/2013
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Lin, Ching-Chung
• Primary Examiner(s): Laxton, Gary L
• Assistant Examiner(s): Moody, Kyle J
• Application Number:
  US14/488,557
• Publication Number:
  US 20150078048A1
• Time in Patent Office: 972 Days
• Field of Search: 323207, 323222, 363 78, 363 79, 363 80, 363 89, 324119, 324120
• CPC Class Codes: G01R 21/00 Arrangements for measuring electric power or power factor G01R7/12 takes precedence
• CPC Class Codes: G01R 21/06 by measuring current and voltage G01R21/08 - G01R21/133 take precedence
• CPC Class Codes: G06F 1/26 Power supply means, e.g. regulation thereof for memories G11C

Abstract

A power detecting circuit for a power supply module is disclosed. The power detecting circuit includes a current detecting module, a micro control unit (MCU), a correcting circuit. The current detecting module is electrically coupled to the power supply module and configured to detect an output current value of the power supply module. The micro control unit (MCU) is electrically coupled to the current detecting module. The correcting circuit is electrically coupled to the MCU and configured to correct the output current value of the power supply module. The MCU is configured to calculate an output power value of the power supply module according to the output current value and a preset output voltage value or a tested output voltage value of the power supply module and display the output power value via a display module.

Claims

1. A power detecting circuit for a power supply module, the power detecting circuit comprising

a current detecting module coupled to the power supply module and configured to detect an output current value thereof;

a micro control unit (MCU) coupled to the current detecting module;

a load coupled to the MCU; and

a correcting circuit coupled to the MCU, the correcting circuit configured to correct the output current value of the power supply module when the load is turned off;

wherein the MCU is configured to calculate an output power value of the power supply module according to a corrected output current value of the power supply module and a preset output voltage value or a tested output voltage value of the power supply module;

the load displays the output power value;

and the correcting circuit comprises a first transistor, a second transistor, and a third transistor;

a base terminal of the first transistor is electrically coupled to the MCU via a first resistor, a collector terminal of the first transistor is electrically coupled to the current detecting module via a second resistor, and an emitter terminal of the first transistor is grounded;

an emitter terminal of the second transistor is electrically coupled to the current detecting module, one terminal of a third resistor is electrically coupled to the current detecting module, and another terminal of the third resistor is electrically coupled to a base terminal of the second transistor via a fourth resistor, a collector terminal of the second transistor is electrically coupled to the load;

one terminal of a fifth resistor is electrically coupled to the base terminal of the second transistor via the fourth resistor, and another terminal of the fifth resistor is electrically coupled to a collector terminal of the third transistor; and

a base terminal of the third transistor is electrically coupled to the MCU via a sixth resistor, and an emitter of the third transistor is grounded.

2. The power detecting circuit of claim 1, wherein the first transistor is an NPN-type transistor, the second transistor is a PNP-type transistor, and the third transistor is the NPN-type transistor.

3. A power detecting circuit for a power supply module, the power detecting circuit comprising:

an alternating current (AC) power source configured to provide an AC voltage to the power supply module;

a current detecting module electrically coupled to the power supply module and configured to detect an output current value of the power supply module;

a micro control unit (MCU) electrically coupled to the current detecting module;

a load coupled to the MCU; and

a correcting circuit coupled to the MCU and configured to correct the output current value of the power supply module when the load is turned off;

wherein the MCU is configured to calculate an output power value of the power supply module according to a corrected output current value and a preset output voltage value or a tested output voltage value of the power supply module;

the correcting circuit comprises a first transistor, a second transistor, and a third transistor;

a base terminal of the first transistor is electrically coupled to the MCU via a first resistor, a collector terminal of the first transistor is electrically coupled to the current detecting module via a second resistor, and an emitter terminal of the first transistor is grounded;

an emitter terminal of the second transistor is electrically coupled to the current detecting module, one terminal of a third resistor is electrically coupled to the current detecting module, and another terminal of the third resistor is electrically coupled to a base terminal of the second transistor via a fourth resistor, a collector terminal of the second transistor is electrically coupled to a load;

one terminal of a fifth resistor is electrically coupled to the base terminal of the second transistor via the fourth resistor, and another terminal of the fifth resistor is electrically coupled to a collector terminal of the third transistor; and

a base terminal of the third transistor is electrically coupled to the MCU via a sixth resistor, and an emitter of the third transistor is grounded.

4. The power detecting circuit of claim 3, wherein the first transistor is an NPN-type transistor, the second transistor is a PNP-type transistor, and the third transistor is the NPN-type transistor.