# US 9,882,468 B2 · Power conversion device and controlling method thereof

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- Number: US 9,882,468 B2
- Document ID: US9882468B2
- Status: Granted
- Kind: B2
- Application number: 14/930,011
- Filed: 2015-11-02
- Published: 2016-07-21
- Granted: 2018-01-30
- Earliest claimed: 2015-01-16
- Assignees: Delta Electronics, Inc.
- Applicants: Delta Electronics, Inc.
- Inventors: Sheng-Hua Li
- Web page: https://patentgrep.com/patent/US9882468B2

## CPC

- H02M 3/04: by static converters
- H02M 1/0032: {Control circuits allowing low power mode operation, e.g. in standby mode}
- 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
- 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

## Abstract

A power conversion device includes a power supplying terminal, a switching converter, a signal injector, a coupler circuit, a detecting circuit and a controller. After an input voltage is converted into an output voltage by the switching converter, the output voltage is outputted to a load through the power supplying terminal. The signal injector provides a signal. When the load is connected with the power supplying terminal, an operating parameter at the first end of the coupler circuit has a first variation value in response to the signal. When the load is disconnected from the power supplying terminal, the operating parameter at the first end of the coupler circuit has a second variation value in response to the signal. According to the detecting result of the detecting circuit, a switching action of the switching element is selectively enabled or disabled by the controller.

## Claims

### Claim 1

A power conversion device, comprising:
a power supplying terminal detachably connected with a load;
a switching converter electrically connected with the power supplying terminal, and comprising at least one switch element, wherein an input voltage is converted into an output voltage by the switching converter and the output voltage is outputted to the load through the power supplying terminal;
a signal injector providing a signal;
a coupler circuit, wherein a first end of the coupler circuit receives the signal, and a second end of the coupler circuit transmits the signal to the power supplying terminal, wherein when the load is connected with the power supplying terminal, an operating parameter at the first end of the coupler circuit has a first variation value in response to the signal, wherein when the load is disconnected from the power supplying terminal, the operating parameter at the first end of the coupler circuit has a second variation value in response to the signal;
a detecting circuit for detecting the operating parameter; and
a controller electrically connected with the detecting circuit and the at least one switch element,
wherein when the detecting circuit judges that the operating parameter at the first end of the coupler circuit has the first variation value, a switching action of the at least one switching element is enabled, wherein when the detecting circuit judges that the operating parameter at the first end of the coupler circuit has the second variation value, the switching action of the at least one switching element is disabled;
wherein the coupler circuit comprises:
a transformer, wherein a primary winding assembly of the transformer is electrically connected with the signal injector for receiving the signal, and the primary winding assembly of the transformer is served as the first end of the coupler circuit; and
a capacitor having a first end electrically connected with a secondary winding assembly of the transformer and a second end electrically connected with the power supplying terminal, wherein the second end of the capacitor is served as the second end of the coupler circuit.

### Claim 2 (depends on 1)

The power conversion device according to claim 1, wherein the signal is a frequency signal.

### Claim 3 (depends on 2)

The power conversion device according to claim 2, wherein the frequency signal is a high frequency signal.

### Claim 4 (depends on 1)

The power conversion device according to claim 1, wherein the input voltage is provided by a battery.

### Claim 5 (depends on 1)

The power conversion device according to claim 1, wherein the transformer is a high frequency transformer.

### Claim 6 (depends on 1)

The power conversion device according to claim 1, wherein the detecting circuit comprises:
an impedance circuit having a first end electrically connected with the primary winding assembly of the transformer and a second end electrically connected with a ground terminal, wherein the impedance circuit has an impedance value, and a voltage at the first end of the impedance circuit is the operating parameter, wherein when the load is connected with the power supplying terminal, the operating parameter has the first variation value in response to the signal, wherein when the load is disconnected from the power supplying terminal, the operating parameter has the second variation value in response to the signal; and
a voltage detector, wherein a first end of the voltage detector is electrically connected with the primary winding assembly of the transformer and the first end of the impedance circuit, and a second end of the voltage detector is electrically connected with the controller, wherein the voltage detector detects whether the voltage at the first end of the voltage detector has the first variation value or the second variation value.

### Claim 7 (depends on 6)

The power conversion device according to claim 6, wherein the impedance circuit comprises a resistor.

### Claim 8 (depends on 1)

The power conversion device according to claim 1, wherein the load is an AC load, and the switching converter is a DC-to-AC converter.

### Claim 9 (depends on 1)

The power conversion device according to claim 1, wherein the power conversion device is an uninterrupted power supply or a charger.

### Claim 10 (depends on 1)

The power conversion device according to claim 1, wherein the power conversion device further comprises an electromagnetic interference filter, wherein the electromagnetic interference filter is connected between the switching converter and the power supplying terminal so as to filter off a frequency component of the output voltage.

### Claim 11

A controlling method of a power conversion device, the power conversion device comprising a power supplying terminal, a switching converter, a signal injector, a coupler circuit, a detecting circuit and a controller, the power supplying terminal being detachably connected with a load, the switching converter being electrically connected with the power supplying terminal and comprising at least one switch element, a first end of the coupler circuit being electrically connected with the signal injector, a second end of the coupler circuit being electrically connected with the power supplying terminal, the detecting circuit being electrically connected with the first end of the coupler circuit, the controller being electrically connected with the detecting circuit and the at least one switch element, the controlling method comprising steps of:
(a) activating the power conversion device;
(b) allowing the signal injector to provide a signal;
(c) transmitting the signal to the power supplying terminal through the coupler circuit, wherein depending on whether the load is connected with the power supplying terminal or disconnected from the power supplying terminal, an operating parameter at the first end of the coupler circuit has a first variation value or a second variation value in response to the signal;
(d) the detecting circuit detecting whether the operating parameter at the first end of the coupler circuit has the first variation value or the second variation value; and
(e) the controller selectively enabling or disabling a switching action of the at least one switch element according to a detecting result of the detecting circuit, wherein when the switching action of the at least one switch element is enabled, an input voltage is converted into an output voltage by the switching converter and the output voltage is outputted to the load through the power supplying terminal;
wherein the coupler circuit comprises:
a transformer, wherein a primary winding assembly of the transformer is electrically connected with the signal injector for receiving the signal, and the primary winding assembly of the transformer is served as the first end of the coupler circuit; and
a capacitor having a first end electrically connected with a secondary winding assembly of the transformer and a second end electrically connected with the power supplying terminal, wherein the second end of the capacitor is served as the second end of the coupler circuit.

### Claim 12 (depends on 11)

The controlling method according to claim 11, wherein when the load is connected with the power supplying terminal, the operating parameter at the first end of the coupler circuit has the first variation value, wherein when the load is disconnected from the power supplying terminal, the operating parameter at the first end of the coupler circuit has the second variation value.

### Claim 13 (depends on 11)

The controlling method according to claim 11, wherein when the operating parameter at the first end of the coupler circuit has the first variation value, the switching action of the at least one switch element is enabled by the controller in the step (e), wherein when the operating parameter at the first end of the coupler circuit has the second variation value, the switching action of the at least one switch element is disabled by the controller in the step (e).