AC input/DC output power supply and control method thereof

• US 10,320,307 B2
• Filed: 08/01/2016
• Issued: 06/11/2019
• Est. Priority Date: 08/07/2015
• Status: Active Grant

• Current Assignee: NEC Platforms, Ltd. (NEC Corporation)
• Original Assignee: NEC Platforms, Ltd. (NEC Corporation)
• Inventors: Katagiri, Yoshihiko
• Primary Examiner(s): Rosario-Benitez, Gustavo A
• Application Number:
  US15/746,487
• Publication Number:
  US 20180219489A1
• Time in Patent Office: 1,044 Days
• CPC Class Codes: H02M 1/42 Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H02M 7/04 by static converters
• CPC Class Codes: H02M 7/217 using semiconductor devices only
• CPC Class Codes: H03K 12/00 Producing pulses by distorting or combining sinusoidal waveforms shaping pulses H03K5/01; combining sinewaves using elements operating in a non-switching manner H03B21/00

Abstract

[Issue] To provide a small size, low cost AC input/DC output power supply capable of supplying both a DC voltage and a high-precision clock signal.

[Solution] An AC input/DC output power supply of the present invention includes: a voltage conversion means for taking an AC voltage as input and generating a secondary voltage, splitting the secondary voltage into a first secondary AC voltage and a second secondary AC voltage, and outputting the first and second secondary voltages; a DC voltage generation means for receiving the first secondary AC voltage and outputting a predetermined DC voltage; a waveform shaping means for receiving the second secondary AC voltage and outputting a square wave voltage signal; and a frequency adjustment means for adjusting a frequency of the square wave voltage signal to be a predetermined frequency, and thereby outputting a clock signal.

Claims

1. An AC input/DC output power supply comprising:

a frequency converter for converting an input AC voltage into an AC voltage of a higher frequency than the frequency of the input AC voltage,

a voltage converter for taking the AC voltage from the frequency converter as input and generating a secondary voltage, splitting the secondary voltage into a first secondary AC voltage and a second secondary AC voltage, and outputting the first and second secondary AC voltages;

a DC voltage generator for receiving the first secondary AC voltage and outputting a predetermined DC voltage to the outside of the AC input/DC output power supply;

a waveform shaper for receiving the second secondary AC voltage and outputting a square wave voltage signal; and

a frequency adjuster for adjusting a frequency of the square wave voltage signal to be a predetermined frequency, and thereby outputting a clock signal to the outside of the AC input/DC output power supply.

2. The AC input/DC output power supply according to claim 1, wherein the frequency adjuster is provided with a frequency setter for setting the clock signal frequency from outside of the frequency adjuster.

3. The AC input/DC output power supply according to claim 1,

wherein the frequency adjuster comprises a PLL frequency division circuit provided with a variable frequency divider.

4. The AC input/DC output power supply according to claim 3,

wherein the variable frequency divider comprises:

a counter configured to count a pulse number of input pulses;

a coincidence circuit configured to output a coincidence signal when the counted pulse number reaches a predetermined value;

a predetermined count value setter for setting the predetermined value; and

a flip-flop configured to reverse its output when the coincidence signal is input to the flip-flop.

5. The AC input /DC output power supply according to claim 4,

wherein the predetermined count value setter is a group of switches configured to set the predetermined value by manual operation.

6. The AC input /DC output power supply according to claim 4,

wherein the predetermined count value setter is a register holding the predetermined value.

10. The AC input /DC output power supply according to claim 2,

wherein the frequency adjuster comprises a PLL frequency division circuit provided with a variable frequency divider.

11. The AC input /DC output power supply according to claim 10,

wherein the variable frequency divider comprises:

a counter configured to count a pulse number of input pulses;

a coincidence circuit configured to output a coincidence signal when the counted pulse number reaches a predetermined value;

a predetermined count value setter for setting the predetermined value; and

a flip-flop configured to reverse its output when the coincidence signal is input to the flip-flop.

12. The AC input /DC output power supply according to claim 11,

wherein the predetermined count value setter is a group of switches configured to set the predetermined value by manual operation.

13. The AC input /DC output power supply according to claim 11,

wherein the predetermined count value setter is a register holding the predetermined value.

7. An AC input/DC output power supply comprising:

a frequency converter for converting an input AC voltage into an AC voltage of a higher frequency than the frequency of the input AC voltage,

a voltage converter for taking the AC voltage from the frequency converter as input and generating a secondary voltage, splitting the secondary voltage into a first secondary AC voltage and a plurality of second secondary AC voltage, and outputting the first and second secondary AC voltages;

a DC voltage generator for receiving the first secondary AC voltage and outputting a predetermined DC voltage to the outside of the AC input/DC output power supply;

a plurality of waveform shaper each for receiving a corresponding one of the plurality of second secondary AC voltages and outputting a square wave voltage signal generated from the second secondary AC voltage; and

a plurality of frequency adjuster each for adjusting a frequency of a corresponding one of the square wave voltage signals to be a predetermined frequency, and thereby outputting a clock signal to the outside of the AC input/DC output power supply.

8. A control method of AC input /DC output power supply, the control method comprising:

converting an input AC voltage into an AC voltage of a higher frequency than the frequency of the input AC voltage;

converting the AC voltage into a secondary voltage;

splitting the secondary voltage into a first secondary AC voltage and a second secondary AC voltage, and outputting the first and second secondary AC voltages;

receiving the first secondary AC voltage and outputting a DC voltage of a predetermined voltage value;

shaping a waveform of the second secondary AC voltage and thereby outputting a square wave voltage signal ; and

receiving the square wave voltage signal and adjusting a frequency of the square wave voltage signal to be a predetermined frequency, thereby outputting a clock signal to the outside of the AC input/DC output power supply.

9. The control method of AC input /DC output power supply according to claim 8,

wherein a frequency of the clock signal is set from outside of the frequency adjuster.