# US 10,483,967 B2 · Switching element driving circuit

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- Number: US 10,483,967 B2
- Document ID: US10483967B2
- Status: Granted
- Kind: B2
- Application number: 16/310,167
- Filed: 2017-07-26
- Published: 2019-10-24
- Granted: 2019-11-19
- Earliest claimed: 2016-09-23
- Assignees: Aisin Aw Co., Ltd.
- Applicants: Aisin Aw Co., Ltd.
- Inventors: Yuji Takakura; Yasushi Nakamura
- Web page: https://patentgrep.com/patent/US10483967B2

## CPC

- H03K 17/04123: {in field-effect transistor switches}
- 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
- H03K 17/16: Modifications for eliminating interference voltages or currents
- H03K 17/56: by the use, as active elements, of semiconductor devices (using diodes H03K17/74)
- H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)}
- H02M 7/53871: {with automatic control of output voltage or current}
- H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence)
- 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)
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

## Abstract

A switching element driving circuit that includes a push-pull buffer circuit driving a switching element to be driven, the push-pull buffer circuit amplifying electrical power of a switching control signal and transmitting the amplified switching control signal to a control terminal of the switching element to be driven; a compensation resistor that connects the input to the output; and an input-side pull-down resistor that connects the input to a negative polarity side of the switching element to be driven.

## Claims

### Claim 1

A switching element driving circuit comprising
a push-pull buffer circuit driving a switching element to be driven, the push-pull buffer circuit amplifying electrical power of a switching control signal and transmitting the amplified switching control signal to a control terminal of the switching element to be driven, wherein:
in the push-pull buffer circuit, switching elements of different polarities are connected in series, as buffer elements, between a first potential and a second potential lower in potential than the first potential;
a connecting point between control terminals of an upper-stage buffer on a side of the first potential and a lower-stage buffer on a side of the second potential serves as an input;
a connecting point between input and output terminals of the upper-stage buffer and the lower-stage buffer serves as an output;
an upper-stage current limiting resistor is provided between the first potential and the upper-stage buffer;
a lower-stage current limiting resistor is provided between the second potential and the lower-stage buffer;
the switching control signal is inputted to the input; and
the output is connected to the control terminal of the switching element to be driven,
a compensation resistor that connects the input to the output; and
an input-side pull-down resistor that connects the input to a negative polarity side of the switching element to be driven,
wherein a sum of a resistance value of the compensation resistor and a resistance value of the input-side pull-down resistor is set to be smaller than a resistance value between the control terminal of the switching element to be driven and an emitter terminal or a source terminal of the switching element, and to be larger than a resistance value of the lower-stage current limiting resistor.

### Claim 2 (depends on 1)

The switching element driving circuit according to claim 1, wherein
the second potential is connected to an output terminal of a negative power supply lower in potential than the negative polarity side of the switching element to be driven,
the negative power supply is a transformer circuit including a primary coil and a secondary coil,
an output-side circuit of the negative power supply includes the secondary coil; a rectifier diode connected in a forward direction, the forward direction being a direction going from the output terminal to a first end of the secondary coil; and a capacitor connected between a second end of the secondary coil and the output terminal, the second end being different from the first end, and
the second end is connected to the negative polarity side of the switching element to be driven.

### Claim 3 (depends on 1)

The switching element driving circuit according to claim 1, wherein the resistance value of the input-side pull-down resistor is set to be 100 or more times larger than the resistance value of the lower-stage current limiting resistor.