# US 9,520,747 B2 · Two-input uninterruptible voltage converting device and method thereof

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- Number: US 9,520,747 B2
- Document ID: US9520747B2
- Status: Granted
- Kind: B2
- Application number: 13/699,650
- Filed: 2010-05-27
- Published: 2013-03-14
- Granted: 2016-12-13
- Earliest claimed: 2010-05-27
- Assignees: Jageson Electronic Technology (Shenzhen) Co., Ltd.; Frank Mau Shin Yim
- Applicants: Frank Mau Shin Yim
- Inventors: Frank Mau Shin Yim
- Web page: https://patentgrep.com/patent/US9520747B2

## CPC

- H02J 9/061: {for DC powered loads}
- H02J 9/062: {for AC powered loads}
- 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 3/33592: {having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer}
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- Y02B 70/30: Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y04S 20/20: End-user application control systems
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS

## Abstract

The invention relates to a two-input uninterruptible voltage converting device and a method thereof. The device comprises a first conversion circuit, a second conversion circuit, an energy storage unit, a fly-wheel switch tube and a control unit. The method comprises the following steps of: converting a PWM signal outputted by a pulse width modulator into first, second, third and fourth PWM signals in phase via a pulse transformer; driving the first conversion circuit and the second conversion circuit respectively to operate synchronously; converting a high voltage DC (Direct Current) and a low voltage DC into two pulse voltages in phase to adaptively perform mutual energy compensation via an intersection; and supplying a load with an uninterruptible stable voltage via the back-end energy storage unit and free-wheel circuit. The two-input uninterruptible voltage converting device has the advantages of high circuit conversion efficiency, high reliability and low power consumption.

## Claims

### Claim 1

A two-input uninterruptible voltage converting device, comprising:
a first conversion circuit, in which the first conversion circuit having a high-voltage DC (Direct Current) source, a main power transformer, an upper switch tube and a lower switch tube connected to a primary winding of the main power transformer, and a switch-type rectifying tube connected to a secondary winding of the main power transformer; and an output end of the switch-type rectifying tube taken as an intersection;
a second conversion circuit, in which the second conversion circuit formed by a low-voltage DC source, an isolating diode and a low-voltage switch tube connected with each other in series in turn; an output end of the second conversion circuit connected to the intersection; the minimum allowable voltage of the low-voltage DC source being more than the rated output voltage of the device; and the maximum voltage of the low-voltage DC source being less than the voltage peak of the secondary winding of the main power transformer when the high-voltage DC is the minimum allowable value;
an energy storage unit, in which the energy storage unit consisting of an inductance and a capacitance and directly connected between the intersection and a load end;
a fly-wheel switch tube, in which the fly-wheel switch tube connected between the intersection and the ground; and
a control unit, in which the control unit used for outputting first, second, third and fourth PWM (Pulse-Width Modulation) signals in phase to drive the upper switch tube, the lower switch tube, the switch-type rectifying tube and the low-voltage switch tube respectively to operate synchronously and outputting a fifth PWM signal in opposite phase with the first PWM signal to drive the fly-wheel switch tube to operate.

### Claim 2 (depends on 1)

The device according to claim 1, wherein the switch-type rectifying tube in the first conversion circuit is an MOSFET and is driven by the third PWM signal outputted by the control unit to operate synchronously with the upper and lower switch tubes.

### Claim 3 (depends on 2)

The device according to claim 2, wherein the control unit has a central control unit, a pulse width modulator and a pulse transformer; and a PWM signal outputted by the pulse width modulator is converted into the first, second, third, fourth and fifth PWM signals via the isolation of the pulse transformer.

### Claim 4 (depends on 1)

The device according to claim 1, wherein the switch-type rectifying tube in the first conversion circuit is an MOSFET and is driven by a bootstrap winding of the main power transformer to operate synchronously with the upper and lower switch tubes.

### Claim 5 (depends on 4)

The device according to claim 4, wherein the control unit has a central control unit, a pulse width modulator and a pulse transformer; and a PWM signal outputted by the pulse width modulator is converted into the first, second, fourth and fifth PWM signals via the isolation of the pulse transformer.

### Claim 6 (depends on 2)

The device according to claim 2, wherein the upper end of the primary winding of the main power transformer in the first conversion circuit is connected with a source electrode of the upper switch tube and the lower end is connected with a drain electrode of the lower switch tube; a drain electrode of the upper switch tube is connected with a positive electrode of the high-voltage DC source; a source electrode of the lower switch tube is connected with a negative electrode of the high-voltage DC source; a first capacitance is connected between the source electrode and the drain electrode of the upper switch tube; and a second capacitance is connected between the source electrode and the drain electrode of the lower switch tube.

### Claim 7 (depends on 1)

The device according to claim 1, wherein the switch-type rectifying tube in the first conversion circuit adopts a Schottky diode.

### Claim 8 (depends on 7)

The device according to claim 7, wherein the upper end of the primary winding of the main power transformer in the first conversion circuit is connected with the source electrode of the upper switch tube and the lower end is connected with the drain electrode of the lower switch tube; the drain electrode of the upper switch tube is connected with the positive electrode of the high-voltage DC source; the source electrode of the lower switch tube is connected with the negative electrode of the high-voltage DC source; the first capacitance is connected between the source electrode and the drain electrode of the upper switch tube; and the second capacitance is connected between the source electrode and the drain electrode of the lower switch tube.

### Claim 9 (depends on 1)

The device according to claim 1, wherein the fly-wheel switch tube is a Schottky diode or an MOSFET.

### Claim 10 (depends on 1)

The device according to claim 1, wherein the fly-wheel switch is a Schottky diode; and the switch-type rectifying tube in the first conversion circuit is another Schottky diode.

### Claim 11

A two-input uninterruptible voltage converting method, comprising the following steps of:
converting a PWM signal outputted by a pulse width modulator into a first, second, third and fourth PWM signals in phase via a pulse transformer; driving an upper switch tube and a lower switch tube on a primary side of a main power transformer in a first conversion circuit, a switch-type rectifying tube on a secondary side, and a low-voltage switch tube in a second conversion circuit respectively to operate synchronously; converting a high-voltage DC and a low-voltage DC into two pulse voltages in phase; adaptively selecting one pulse voltage to supply a back-end energy storage unit with a current after the intersection of an output end of the switch-type rectifying tube;
allowing a pulse transformer to output a fifth PWM signal in opposite phase and mutual pulse width compensation with the first PWM signal simultaneously to drive a fly-wheel switch tube to operate; supplying a fly-wheel channel for a BEMF (Back Electromotive Force) on an inductance in the energy storage unit during the shutdown of the upper switch tube, the lower switch tube and a low-voltage switch tube; and
allowing a central control unit to sample a voltage at a load end and control the pulse width of the PWM signal outputted by the pulse width modulator after analysis and determination, so that the DC voltage outputted by the load end can be kept stable.

### Claim 12 (depends on 11)

The method according to claim 11, wherein the second conversion circuit simultaneously supplies the switch-type rectifying tube with energy when supplying the back-end energy storage unit with electrical energy; the energy is subjected to backcoupling of the main power transformer and rectification of diodes in turn to generate a non-voltage-regulation high-frequency voltage and form a DC high voltage on a capacitance of a high-voltage bus, so that the energy can be supplied for a load which operates under high voltage.