Power detection and transmission circuit coupling analog input signal on primary side to secondary side for power information calculation and related power supply apparatus

Patent metadata

Field	Value
Publication number	US-9859790-B2
Application number	US-201715469590-A
Country	US
Kind code	B2
Filing date	Mar 27, 2017
Priority date	Mar 31, 2016
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

A power detection and transmission circuit is provided. The power detection and transmission circuit includes a first conversion circuit, a second conversion circuit and a signal coupling circuit. The first conversion circuit is electrically connected to a power supply module to receive an analog input signal, and is arranged for converting the analog input signal to a first pulse width modulation (PWM) signal. The second conversion circuit is arranged for converting a second PWM signal to an analog regenerated signal, and transmitting the analog regenerated signal to a microcontroller, wherein the microcontroller calculates power information of the power supply module according to the analog regenerated signal. The signal coupling circuit is coupled between the first conversion circuit and the second conversion circuit, and is arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the second PWM signal.

First claim

What is claimed is:

1. A power detection and transmission circuit, comprising:
a first conversion circuit, electrically connected to a power supply module to receive an analog input signal, the first conversion circuit arranged for converting the analog input signal to a first pulse width modulation (PWM) signal;
a second conversion circuit, for converting a second PWM signal to an analog regenerated signal, and transmitting the analog regenerated signal to a microcontroller, wherein the microcontroller calculates power information of the power supply module according to the analog regenerated signal; and
a signal coupling circuit, coupled between the first conversion circuit and the second conversion circuit, the signal coupling circuit arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the second PWM signal.

2. The power detection and transmission circuit of claim 1 , wherein the first conversion circuit comprises:
a signal processing circuit, for processing the analog input signal to generate a preprocessed signal;
an oscillator, for generating an oscillation signal; and
a comparator, coupled to the signal processing circuit and the oscillator, the comparator arranged for comparing the preprocessed signal with the oscillation signal to generate the first PWM signal.

3. The power detection and transmission circuit of claim 2 , wherein the analog input signal comprises a line voltage signal and a neutral voltage signal, and the signal processing circuit subtracts one of the line voltage signal and the neutral voltage signal from the other of the line voltage signal and the neutral voltage signal to generate the preprocessed signal.

4. The power detection and transmission circuit of claim 2 , wherein the analog input signal comprises an input current signal, the signal processing circuit amplifies the input current signal to generate the preprocessed signal, and the input current signal is generated by a sensing resistor of the power supply module.

5. The power detection and transmission circuit of claim 1 , wherein the second conversion circuit is a low pass filter circuit.

6. The power detection and transmission circuit of claim 1 , wherein the signal coupling circuit further isolates the second PWM signal from the first PWM signal.

7. The power detection and transmission circuit of claim 6 , wherein the signal coupling circuit is a photocoupler circuit.

8. A power detection and transmission circuit, comprising:
a first conversion circuit, for detecting an input voltage signal and an input current signal of a power supply module, converting the input voltage signal to a first pulse width modulation (PWM) signal, and converting the input current signal to a second PWM signal, wherein the input voltage signal and the input current signal have the same phase;
a second conversion circuit, for converting a third PWM signal to a first analog regenerated signal, converting a fourth PWM signal to a second analog regenerated signal, and transmitting the first analog regenerated signal and the second analog regenerated signal to a microcontroller, wherein the microcontroller calculates power information of the power supply module according to the first analog regenerated signal and the second analog regenerated signal; and
a signal coupling circuit, coupled between the first conversion circuit and the second conversion circuit, the signal coupling circuit arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the third PWM signal, and coupling the second PWM signal to the second conversion circuit and accordingly generating the fourth PWM signal.

9. The power detection and transmission circuit of claim 8 , wherein the input voltage signal comprises a line voltage signal and a neutral voltage signal; and the first conversion circuit comprises:
a signal subtractor, for subtracting one of the line voltage signal and the neutral voltage signal from the other of the line voltage signal and the neutral voltage signal to generate a first preprocessed signal;
a signal amplifier, for amplifying the input current signal to generate a second preprocessed signal, wherein the input current signal is generated by a sensing resistor of the power supply module;
an oscillator, for generating an oscillation signal;
a first comparator, coupled to the signal subtractor and the oscillator, the first comparator arranged for comparing the first preprocessed signal with the oscillation signal to generate the first PWM signal; and
a second comparator, coupled to the signal amplifier and the oscillator, the second comparator arranged for comparing the second preprocessed signal with the oscillation signal to generate the second PWM signal.

10. A power supply apparatus, comprising:
a power supply module, comprising an electromagnetic interference filter, a rectifier circuit, a power factor correction circuit and a DC/DC converter circuit;
a power detection and transmission circuit, comprising:
a first conversion circuit, electrically connected to the power supply module to receive an analog input signal, the first conversion circuit arranged for converting the analog input signal to a first pulse width modulation (PWM) signal;
a second conversion circuit, for converting a second PWM signal to an analog regenerated signal; and
a signal coupling circuit, coupled between the first conversion circuit and the second conversion circuit, the signal coupling circuit arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the second PWM signal; and

a microcontroller, coupled to the second conversion, the microcontroller arranged for receiving the analog regenerated signal to calculate power information of the power supply module.

11. The power supply apparatus of claim 10 , wherein the first conversion circuit comprises:
a signal processing circuit, for processing the analog input signal to generate a preprocessed signal;
an oscillator, for generating an oscillation signal; and
a comparator, coupled to the signal processing circuit and the oscillator, the comparator arranged for comparing the preprocessed signal with the oscillation signal to generate the first PWM signal.

12. The power supply apparatus of claim 11 , wherein the signal processing circuit is electrically connected to an input side of the rectifier circuit; the analog input signal comprises a line voltage signal and a neutral voltage signal; and the signal processing circuit subtracts one of the line voltage signal and the neutral voltage signal from the other of the line voltage signal and the neutral voltage signal to generate the preprocessed signal.

13. The power supply apparatus of claim 11 , wherein the signal processing circuit is electrically connected to a sensing resistor of the power factor correction circuit; the analog input signal comprises an input current signal; and the signal processing circuit amplifies the input current signal to generate the preprocessed signal, and the input current signal is generated by the sensing resistor.

14. The power supply apparatus of claim 10 , wherein the microcontroller detects if a voltage level of the analog regenerated signal is less than or equal to a predetermined level for more than a predetermined period of time; and when the voltage level of the analog regenerated signal is less than or equal to the predetermined level for more than the predetermined period of time, the microcontroller outputs an alert signal to a load, and accordingly enables the load to instructs an external power source to

Assignees

• Fsp Tech Inc

Inventors

• Lin Kuo-Fan
• Tu Fu-Kai

Classifications

• H02M3/04 Primary

  by static converters · CPC title

• H02M1/42

  Circuits or arrangements for compensating for or adjusting power factor in converters or inverters · CPC title

• G01R21/06 Primary

  by measuring current and voltage (G01R21/08 - G01R21/133 take precedence) · CPC title

• G01R21/127

  by using pulse modulation (G01R21/133 takes precedence) · CPC title

• H02M1/44

  Circuits or arrangements for compensating for electromagnetic interference in converters or inverters · CPC title