# US 10,320,236 B2 · Wireless power transmission apparatus and method of controlling the same

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- Number: US 10,320,236 B2
- Document ID: US10320236B2
- Status: Granted
- Kind: B2
- Application number: 15/200,266
- Filed: 2016-07-01
- Published: 2017-05-04
- Granted: 2019-06-11
- Earliest claimed: 2015-10-28
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Applicants: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Seung Won Park; Sang Ho Cho; Eun Young Shin; Jae Suk Sung; Chang Ik Kim
- Web page: https://patentgrep.com/patent/US10320236B2

## CPC

- H02J 50/12: of the resonant type
- H02M 3/015: {with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuit}
- H02M 3/33571: {Half-bridge at primary side of an isolation transformer}
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J 7/70: characterised by the mechanical construction
- H02J 2207/20: Charging or discharging characterised by the power electronics converter
- 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
- 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

## Abstract

A wireless power transmission apparatus includes a resonator configured to be magnetically coupleable to a wireless power reception apparatus; an inverter configured to operate the resonator; and a resonant frequency controller configured to control a resonant frequency of the resonator in response to a change in operating frequency of the inverter.

## Claims

### Claim 1

A power transmission apparatus, comprising:
a resonator configured to magnetically couple to a power reception apparatus;
an inverter configured to operate the resonator; and
a resonant frequency controller configured to:
detect an operating frequency of the inverter,
determine whether the operating frequency is in a range between a lower limit and an upper limit,
in a case in which the operating frequency is less than the lower limit, increase a resonant frequency of the resonator, and
in a case in which the operating frequency is greater than the upper limit, decrease the resonant frequency of the resonator.

### Claim 2 (depends on 1)

The power transmission apparatus of claim 1, wherein the resonant frequency controller is configured to vary a capacitance of the resonator to increase or decrease the resonant frequency.

### Claim 3 (depends on 1)

The power transmission apparatus of claim 1, further comprising: a controller configured to determine a power requirement of the power reception apparatus and adaptively adjust the operating frequency of the inverter based on the power requirement.

### Claim 4 (depends on 3)

The power transmission apparatus of claim 3, wherein the controller is configured to decrease the operating frequency in response to an increase in the power requirement.

### Claim 5 (depends on 1)

The power transmission apparatus of claim 1, wherein the resonant frequency controller comprises:
a variable capacitor configured to vary capacitance of the resonator; and
a capacitance controller configured to:
control capacitance of the variable capacitor based on whether the operating frequency is in a range between a lower limit and an upper limit.

### Claim 6 (depends on 5)

The power transmission apparatus of claim 5, wherein the capacitance controller is configured to increase the capacitance of the variable capacitor in the case in which the operating frequency is greater than the upper limit.

### Claim 7 (depends on 5)

The power transmission apparatus of claim 5, wherein the capacitance controller is configured to decrease the capacitance of the variable capacitor in the case in which the operating frequency is less than the lower limit.

### Claim 8

A method of controlling a power transmission apparatus, the method comprising:
determining a power requirement of a power reception apparatus;
controlling an operating frequency of an inverter connected to a resonator based on the power requirement, the resonator being configured to magnetically couple to the power reception apparatus;
determining whether the operating frequency is in a range between a lower limit and an upper limit;
in a case in which the operating frequency is less than the lower limit, increasing a resonant frequency of the resonator; and
in a case in which the operating frequency is greater than the upper limit, decreasing the resonant frequency of the resonator.

### Claim 9 (depends on 8)

The method of claim 8, wherein the controlling of the operating frequency of the inverter comprises:
decreasing the operating frequency in response to an increase in the power requirement; and
increasing the operating frequency in response to a decrease in the power requirement.

### Claim 10 (depends on 9)

The method of claim 9, further comprising:
increasing capacitance of the resonator in the case in which the operating frequency is greater than the upper limit.

### Claim 11 (depends on 9)

The method of claim 9, further comprising:
decreasing capacitance of the resonator in the case in which the operating frequency is less than the lower limit.

### Claim 12

A power transmission apparatus, comprising:
an inverter and a resonator;
a power supply configured to supply power to the resonator; and
a resonant frequency controller configured to control a resonant frequency of the resonator in response to a detected operational frequency of the inverter such that the resonant frequency of the resonator is increased in a case in which the detected operational frequency is less than a lower limit, and the resonant frequency of the resonator is decreased in a case in which the detected operational frequency is greater than an upper limit.

### Claim 13 (depends on 12)

The apparatus of claim 12, wherein the resonant frequency controller is configured to detect a load on the power supply and adaptively adjust the resonant frequency of the resonator in response to the detection.

### Claim 14 (depends on 12)

The apparatus of claim 12, further comprising a power controller configured to adaptively adjust an operational characteristic of the power supply based on a detected operational characteristic of a power reception apparatus.

### Claim 15 (depends on 12)

The apparatus of claim 12, further comprising a power controller configured to adaptively adjust the operational frequency of the inverter based on a power requirement of a power reception apparatus.