# US 10,771,055 B2 · Switching device and power conversion device

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- Number: US 10,771,055 B2
- Document ID: US10771055B2
- Status: Granted
- Kind: B2
- Application number: 16/321,096
- Filed: 2017-07-25
- Published: 2019-05-30
- Granted: 2020-09-08
- Earliest claimed: 2016-08-05
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Nikolay Nikolayevich Olyunin; Alexander Nikolayevich Khripkov; Alexander Gennadyevich Chernokalov
- Web page: https://patentgrep.com/patent/US10771055B2

## CPC

- H03K 17/687: the devices being field-effect transistors
- H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M 3/335: using semiconductor devices only
- H03K 17/04123: {in field-effect transistor switches}
- H03K 17/04163: {in field-effect transistor switches}
- H03K 17/063: {in field-effect transistor switches}
- H03K 17/08104: {in field-effect transistor switches (H03K17/0812, H03K17/0814 take precedence)}
- H03K 17/08142: {in field-effect transistor switches}
- H03K 17/102: {in field-effect transistor switches}
- H02M 1/0058: {by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826)}
- H02M 3/33538: {of the forward type (H02M3/3353, H02M3/33569 take precedence)}
- 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
- H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M)
- 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

Provided is a switching device including: a cascode switch including at least two transistors connected in series and receiving a switching control signal; and a third switch receiving the switching control signal, wherein the at least two transistors include a first transistor receiving the switching control signal through a control terminal and a second transistor having a control terminal connected to a first voltage source, and wherein the third switch is connected between the control terminal and the first terminal of the second transistor, is turned off when the first transistor is turned on, and is turned on when the first transistor is turned off.

## Claims

### Claim 1

A switching device comprising:
a cascode switch comprising at least two transistors connected in series and receiving a switching control signal; and
a third switch receiving the switching control signal,
wherein the at least two transistors comprise a first transistor receiving the switching control signal through a control terminal and a second transistor comprising a control terminal connected to a first voltage source, and
wherein the third switch is connected between the control terminal of the second transistor and a first terminal of the second transistor, is turned off when the first transistor is turned on, and is turned on when the first transistor is turned off.

### Claim 2 (depends on 1)

The switching device of claim 1, wherein the cascode switch is connected between a ground node and an output node, a first terminal of the first transistor is connected to the ground node, and a second terminal of the second transistor is connected to the output node.

### Claim 3 (depends on 1)

The switching device of claim 1, wherein each of the first transistor, the second transistor, and the third switch is a Metal Oxide Silicon Field Effect Transistor (MOSFET),
wherein the control terminal of the first transistor, the second transistor, and the third switch is a gate of the MOSFET, and
wherein the first terminal of the second transistor is a source of the MOSFET.

### Claim 4 (depends on 3)

The switching device of claim 3, wherein each of the first transistor and the second transistor is an N-type MOSFET, and the third switch is a P-type MOSFET.

### Claim 5 (depends on 1)

The switching device of claim 1, wherein each of the first transistor, the second transistor, and the third switch is a bipolar transistor, the control terminal of the first transistor and the second transistor is a base, and the first terminal of the second transistor is an emitter.

### Claim 6 (depends on 1)

The switching device of claim 1, wherein each of the first transistor and the second transistor are an npn transistor, and the third switch is a pnp transistor.

### Claim 7 (depends on 1)

The switching device of claim 1, wherein the cascode switch comprises at least one transistor connected between a second terminal of the first transistor and the first terminal of the second transistor.

### Claim 8 (depends on 1)

The switching device of claim 1, wherein a power capacity of the second transistor is greater than that of the first transistor, and
wherein a power capacity of the third switch is smaller than that of the second transistor.

### Claim 9 (depends on 1)

The switching device of claim 1, further comprising: a first diode comprising a cathode connected to the control terminal of the second transistor and an anode connected to a second terminal of the second transistor, and being connected with the third switch in parallel between the control terminal and the second terminal of the second transistor.

### Claim 10 (depends on 1)

The switching device of claim 1, wherein the switching control signal is an alternating current (AC) signal and an output node outputs an AC current synchronized with a frequency of the switching control signal.

### Claim 11 (depends on 1)

The switching device of claim 1, wherein the first voltage source is a direct current (DC) voltage source having a voltage level lower than a high level voltage of an output node.

### Claim 12 (depends on 1)

The switching device of claim 1, wherein the switching control signal has a frequency between 50 MHz and 60 MHz.

### Claim 13 (depends on 1)

A power conversion device comprising the switching device according to claim 1.

### Claim 14 (depends on 13)

The power conversion device of claim 13, wherein the power conversion device comprises:
a first AC-DC converter configured to receive a first AC current and convert the first AC current into a first DC current having a first voltage level;
an inverter configured to convert the first DC current output from the first AC-DC converter into a second AC current of a first frequency;
a transformer configured to convert the second AC current output from the inverter into a third AC current having a second voltage level and outputting the third AC current; and
a second AC-DC converter configured to convert the third AC current output from the transformer into a second DC current having a rated output voltage level,
wherein the inverter comprises the switching device and the switching device receives the switching control signal of the first frequency.

### Claim 15 (depends on 14)

The power conversion device of claim 14, wherein the first DC current output from the first AC-DC converter has a voltage level higher than that of the first AC current.