# US 2010/0165673 A1 · Power supply having a two-way DC to DC converter

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- Number: US 2010/0165673 A1
- Document ID: US20100165673A1
- Status: Published application
- Kind: A1
- Application number: 12/459,428
- Filed: 2009-07-01
- Published: 2010-07-01
- Earliest claimed: 2008-12-29
- Assignees: Acbel Polytech Inc.
- Inventors: Shun-Te Chang; Wei-Liang Lin
- Web page: https://patentgrep.com/patent/US20100165673A1

## CPC

- H02M 1/10: Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A power supply having a two-way DC to DC converter has an AC to DC converter and a two-way DC to DC converter. When an AC power is input to the AC to DC converter, the AC to DC converter transforms the AC power to a middle level DC power and the two-way DC to DC converter transforms the middle level DC power to a low level DC power. When the AC power is unavailable and the two-way DC to DC converter obtains an external DC power, the two-way DC to DC converter transforms the external DC power to the middle level DC power. Therefore, if the power supply obtains the external DC power, the power supply can still output the middle level DC power even the AC power is unavailable.

## Claims

### Claim 1

A power supply having a two-way DC to DC converter comprising:
an AC to DC converter having
an input terminal obtaining an AC power so the AC to DC converter rectifies and filters the AC power and converts the AC power to a middle level DC power; and
an output terminal outputting the middle level DC power;
a two-way DC to DC converter having
a first input and output (I/O) terminal being connected to the output terminal of the AC to DC converter; and
a second I/O terminal; and
wherein when the AC to DC converter outputs the middle level DC power, the two-way DC to DC converter transforms the middle level DC power to a low level DC power, and the second I/O terminal of the two-way DC to DC converter outputs the low level DC power; and
wherein when the AC to DC converter stops outputting the middle level DC power and the second I/O terminal of the two-way DC to DC converter obtains an external DC power, the two-way DC to DC converter transforms the external DC power to the middle level DC power, and the first I/O terminal of the two-way DC to DC converter outputs the middle level DC power to the output terminal of the AC to DC converter.

### Claim 2 (depends on 1)

The power supply as claimed in claim 1, wherein the two-way DC to DC converter comprises:
an output inductor having a first end and a second end;
an output capacitor being connected to the second end of the output inductor;
a first electronic switch being connected between the output terminal of the AC to DC converter and the first end of the output inductor;
a second electronic switch being connected to the first electronic switch and the first end of the output inductor;
a control module having
a first switch control terminal being connected to the first electronic switch;
a second switch control terminal being connected to the second electronic switch;
a feedback selection detection terminal being connected to the AC to DC converter so the control module determines whether the AC to DC converter outputs the middle level DC power through the feedback selection detection terminal;
a first feedback terminal being connected to and obtaining a second feedback voltage on the first I/O terminal of the two-way DC to DC converter; and
a second feedback terminal being connected to and obtaining a first feedback voltage on the second I/O terminal of the two-way DC to DC converter;
wherein when the control module determines that the AC to DC converter outputs the middle level DC power, the control module treats the first second electronic switch as an active switch, obtains the first feedback voltage and adjusts a turn on period of the first electronic switch to maintain the low level DC power stably output from the two-way DC to DC converter based on the first feedback voltage so the two-way DC to DC converter operates as a buck converter; and
wherein when the control module determines that the AC to DC converter does not output the middle level DC power and the second I/O terminal of the two-way DC to DC converter obtains an external DC power, the control module treats the second electronic switch as an active switch, obtains the second feedback voltage and adjusts a turn on period of the second electronic switch to maintain the middle level DC power stably output from the two-way DC to DC converter based on the second feedback voltage so the two-way DC to DC converter operates as a boost converter.

### Claim 3 (depends on 2)

The power supply as claimed in claim 2, wherein the control module is a programmable processor.

### Claim 4 (depends on 2)

The power supply as claimed in claim 2, wherein the control module comprises:
a dual output pulse width modulation (PWM) controller having the first switch control terminal, the second switch control terminal and a feedback input terminal;
a rectifier diode having
an anode performing the feedback selection detection terminal to connect to the AC to DC converter; and
a cathode;
a charging capacitor being connected to the cathode of the rectifier diode;
a resistor being connected to the charging capacitor in parallel;
a feedback selector having
a selection input terminal being connected to the charging capacitor and the resistor;
the first feedback terminal being connected to the first I/O terminal of the two-way DC to DC converter;
the second feedback terminal being connected to the second I/O terminal of the two-way DC to DC converter; and
a feedback output terminal being connected to the feedback input terminal of the dual output PWM controller; and
wherein the feedback selector assists the dual output PWM controller in obtaining either the first feedback voltage or the second feedback voltage based on whether the AC to DC converter outputs the middle level DC power.

### Claim 5 (depends on 4)

The power supply as claimed in claim 4, wherein the feedback selector is a transistor switch having:
a gate terminal performing the selection input terminal;
a source terminal performing the first feedback terminal and the feedback output terminal; and
a drain terminal performing the second feedback terminal.

### Claim 6 (depends on 4)

The power supply as claimed in claim 4, wherein the dual output PWM controller controls the first and the second electronic switches to turn on based on duty cycles both under 50%.

### Claim 7 (depends on 5)

The power supply as claimed in claim 5, wherein the dual output PWM controller controls the first and the second electronic switches to turn on based on duty cycles both under 50%.

### Claim 8 (depends on 2)

The power supply as claimed in claim 2, wherein the control module comprises:
a rectifier diode having
an anode performing the feedback selection detection terminal to connect to the AC to DC converter; and
a cathode;
a charging capacitor being connected to the cathode of the rectifier diode;
a resistor being connected to the charging capacitor in parallel;
a boost PWM controller having
an enable terminal being connected to the charging capacitor and the resistor through an inverter;
the first feedback terminal being connected to the first I/O terminal of the two-way DC to DC converter;
the first switch control terminal being connected to the first electronic switch; and
the second switch control terminal being connected to the second electronic switch;
a buck PWM controller having
an enable terminal being connected to the charging capacitor and the resistor;
the second feedback terminal being connected to the second I/O terminal of the two-way DC to DC converter;
the first switch control terminal being connected to the first electronic switch; and
the second switch control terminal being connected to the second electronic switch;
wherein when the AC to DC converter outputs the middle level DC power, the boost PWM controller does not work but the buck PWM controller works normally to control the two-way DC to DC to operate as a buck converter; and
wherein when the AC to DC converter does not output the middle level DC power and the second I/O terminal of the two-way DC to DC converter obtains an external DC power, the buck PWM controller does not work but the boost PWM controller works normally to control the two-way DC to DC to operate as a boost converter.

### Claim 9 (depends on 1)

The power supply as claimed in claim 1, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power; and
a switch DC to DC converter being connected to the full-wave rectifier and the output terminal of the AC to DC converter, converting the DC power from the full-wave rectifier to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 10 (depends on 2)

The power supply as claimed in claim 2, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power; and
a switch DC to DC converter being connected to the full-wave rectifier and the output terminal of the AC to DC converter, converting the DC power from the full-wave rectifier to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 11 (depends on 4)

The power supply as claimed in claim 4, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power; and
a switch DC to DC converter being connected to the full-wave rectifier and the output terminal of the AC to DC converter, converting the DC power from the full-wave rectifier to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 12 (depends on 5)

The power supply as claimed in claim 5, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power; and
a switch DC to DC converter being connected to the full-wave rectifier and the output terminal of the AC to DC converter, converting the DC power from the full-wave rectifier to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 13 (depends on 7)

The power supply as claimed in claim 7, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power; and
a switch DC to DC converter being connected to the full-wave rectifier and the output terminal of the AC to DC converter, converting the DC power from the full-wave rectifier to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 14 (depends on 8)

The power supply as claimed in claim 8, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power; and
a switch DC to DC converter being connected to the full-wave rectifier and the output terminal of the AC to DC converter, converting the DC power from the full-wave rectifier to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 15 (depends on 1)

The power supply as claimed in claim 1, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power;
a power factor correction (PFC) circuit being connected to the full-wave rectifier and correcting power factors of the DC power from the full-wave rectifier; and
a switch DC to DC converter being connected to the PFC circuit and the output terminal of the AC to DC converter, converting the corrected DC power from the PFC circuit to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 16 (depends on 2)

The power supply as claimed in claim 2, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power;
a power factor correction (PFC) circuit being connected to the full-wave rectifier and correcting power factors of the DC power from the full-wave rectifier; and
a switch DC to DC converter being connected to the PFC circuit and the output terminal of the AC to DC converter, converting the corrected DC power from the PFC circuit to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 17 (depends on 4)

The power supply as claimed in claim 4, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power;
a power factor correction (PFC) circuit being connected to the full-wave rectifier and correcting power factors of the DC power from the full-wave rectifier; and
a switch DC to DC converter being connected to the PFC circuit and the output terminal of the AC to DC converter, converting the corrected DC power from the PFC circuit to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 18 (depends on 5)

The power supply as claimed in claim 5, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power;
a power factor correction (PFC) circuit being connected to the full-wave rectifier and correcting power factors of the DC power from the full-wave rectifier; and
a switch DC to DC converter being connected to the PFC circuit and the output terminal of the AC to DC converter, converting the corrected DC power from the PFC circuit to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 19 (depends on 7)

The power supply as claimed in claim 7, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power;
a power factor correction (PFC) circuit being connected to the full-wave rectifier and correcting power factors of the DC power from the full-wave rectifier; and
a switch DC to DC converter being connected to the PFC circuit and the output terminal of the AC to DC converter, converting the corrected DC power from the PFC circuit to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.

### Claim 20 (depends on 8)

The power supply as claimed in claim 8, wherein the AC to DC converter comprises:
a full-wave rectifier being connected to the input terminal of the AC to DC converter and obtaining and rectifying the AC power to a DC power;
a power factor correction (PFC) circuit being connected to the full-wave rectifier and correcting power factors of the DC power from the full-wave rectifier; and
a switch DC to DC converter being connected to the PFC circuit and the output terminal of the AC to DC converter, converting the corrected DC power from the PFC circuit to a middle level DC power and transmits the middle level DC power to the output terminal of the AC to DC converter.