Power supply apparatus with input voltage detection and method of operating the same

Patent metadata

Field	Value
Publication number	US-9450507-B2
Application number	US-201414532547-A
Country	US
Kind code	B2
Filing date	Nov 4, 2014
Priority date	May 16, 2014
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

A power supply apparatus with input voltage detection includes a power input side and an input detection module. The power input side has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are electrically connected to a live wire and a neutral wire of an AC power source, respectively. The input detection module has two input terminals, which are corresponding electrically connected to the first input terminal and the second input terminal. The input detection module generates a detection signal to shut down the power supply apparatus when the input detection module detects that the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal.

First claim

What is claimed is:

1. A power supply apparatus with input voltage detection, comprising:
a power input side having a first input terminal and a second input terminal; the first input terminal electrically connected to a live wire of an AC power source, and the second input terminal electrically connected to a neutral wire of the AC power source; and
an input detection module having a first detection terminal and a second detection terminal; the first detection terminal electrically connected to the first input terminal, and the second detection terminal electrically connected to the second input terminal;
wherein the input detection module is configured to generate a detection signal to shut down the power supply apparatus so as to protect the power supply apparatus when the input detection module detects that the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal,
wherein the input detection module comprises:
a full-wave rectifier further having the first detection terminal, the second detection terminal, a first rectifying output terminal and a second rectifying output terminal;
a diode electrically connected to the first rectifying output terminal;
a first transistor switch electrically connected to the diode and the first rectifying output terminal;
a photoelectric coupler having an anode and a cathode, the anode electrically connected to the diode;
a second transistor switch electrically connected to the cathode of the photoelectric coupler; and
a capacitor having a first terminal electrically connected to the anode of the photoelectric coupler; and a second terminal electrically connected to first transistor switch, the second transistor switch and the second rectifying output terminal.

2. The power supply apparatus with input voltage detection of claim 1 , wherein
the full-wave rectifier comprises a first rectifying input terminal, and a second rectifying input terminal, the first rectifying input terminal is the first detection terminal, and the second rectifying input terminal is the second detection terminal;
the diode comprises an anode and a cathode, and the anode of the diode electrically connected to the first rectifying output terminal;
the first transistor switch comprises a source, a drain, and a gate, the gate of the first transistor switch electrically connected to the first rectifying output terminal and the anode of the diode;
the second transistor switch comprises a source, a drain, and a gate; and
the first terminal of the capacitor is electrically connected to the cathode of the diode, and the second terminal of the capacitor, the source of the first transistor switch, the source of the second transistor switch, and the second rectifying output terminal are connected to a grounding module,
wherein the input detection module further comprises:
a first resistor having a first terminal and a second terminal; the drain of the first transistor switch electrically connected to the first terminal of the first resistor, the second terminal of the first resistor electrically connected to the cathode of the diode; and
a second resistor having a first terminal and a second terminal; the drain of the second transistor switch electrically connected to the first terminal of the second resistor, the second terminal of the second resistor electrically connected to the cathode of the photoelectric coupler, and the gate of the second transistor switch electrically connected to the drain of the first transistor switch and the first terminal of the first resistor.

3. The power supply apparatus with input voltage detection of claim 1 , wherein the AC power source is rectified by the full-wave rectifier to output a rectified voltage, and the rectified voltage is configured to turn on the first transistor switch and charge the capacitor so that the second transistor switch and the photoelectric coupler are turned off when the AC power source normally supplies power to the power supply apparatus; or the AC power source is not output to the full-wave rectifier to turn off the first transistor switch, and the capacitor is discharged via a discharging path formed by the photoelectric coupler, the second resistor, and the second transistor switch so that the detection signal outputted from the photoelectric coupler is an abnormal detection signal to shut down the power supply apparatus and protect the power supply apparatus when the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal.

4. The power supply apparatus with input voltage detection of claim 1 , wherein the grounding module is different from a grounding of the power supply apparatus, and the input detection module is not commonly grounded with the rest of the power supply apparatus.

5. A method of operating a power supply apparatus with input voltage detection, the method comprising following steps of:
(a) providing the power supply apparatus having a power input side, and the power input side having a first input terminal and a second input terminal; the first input terminal electrically connected to a live wire of an AC power source, and the second input terminal electrically connected to a neutral wire of the AC power source;
(b) providing an input detection module having a first detection terminal and a second detection terminal; the first detection terminal electrically connected to the first input terminal, and the second detection terminal electrically connected to the second input terminal; and
(c) generating a detection signal by the input detection module to shut down the power supply apparatus so as to protect the power supply apparatus when the input detection module detects that the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal,
wherein the input detection module comprises:
a full-wave rectifier further having the first detection terminal, the second detection terminal, a first rectifying output terminal and a second rectifying output terminal;
a diode electrically connected to the first rectifying output terminal;
a first transistor switch electrically connected to the diode and the first rectifying output terminal;
a photoelectric coupler having an anode and a cathode, the anode electrically connected to the diode;
a second transistor switch electrically connected to the cathode of the photoelectric coupler; and
a capacitor having a first terminal electrically connected to the anode of the photoelectric coupler; and a second terminal electrically connected to first transistor switch, the second transistor switch and the second rectifying output terminal.

6. The method of operating the power supply apparatus with input voltage detection of claim 5 , wherein
the full-wave rectifier comprises a first rectifying input terminal, and a second rectifying input terminal, the first rectifying input terminal is the first detection terminal, and the second rectifying input terminal is the second detection terminal;
the diode comprises an anode and a cathode, and the anode of the diode electrically connected to the first rectifying output terminal;
the first transistor switch comprises a source, a drain, and a gate, the gate of the first transistor switch electrically connected to the first rectifying output terminal and the anode of the diode;
the second transistor switch comprises a source, a drain, and a gate; and
the first terminal of the capacitor is electrically connected to the cathode of the diode, and the second terminal of the capacitor, the source of the first transistor switch, the source of the second transistor switch, and the second rectifying output terminal are connected to a grounding module,
wherein the input detection module further com

Assignees

• Delta Electronics Inc

Inventors

• Pwu Jong-Wei
• Hsu Wen-Kuan
• Lu Jia-Dian
• Lin Kun-Chi

Classifications

• H02M2001/007

  Electricity · mapped topic

• H02M3/33507

  with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence) · CPC title

• H02M1/32 Primary

  Means for protecting converters other than automatic disconnection · CPC title

• H02M7/06

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

• H02M7/217 Primary

  using semiconductor devices only · CPC title