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US 9,866,126 B2Granted
Galvanic isolator and circuit using galvanic isolation
AssigneeRenesas Electronics America Inc.
InventorTetsuo Sato
Life of this patent
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Abstract
A method and apparatus for isolating voltages while transmitting data signals. In one embodiment of the method, a modulation circuit modulates a carrier signal using an input data signal. A demodulation circuit receives the modulated carrier signal via a first capacitor coupled in series between the modulation circuit and the demodulation circuit. The demodulation circuit also receives the carrier signal via a second capacitor coupled in series between the demodulation circuit and the circuit that generates the carrier signal. The demodulation circuit demodulates the modulated carrier signal using the carrier signal.
Claims18
An apparatus comprising:
- a first switch coupled between a first voltage node and a common node;
- a second switch coupled between the common node and a second voltage node;
- a third switch coupled between the first voltage node and another common node;
- a fourth switch coupled between the other common node and the second voltage node;
- an inductor coupled to the common node and the other common node
- a first circuit for generating a pulse width modulation (PWM) signal;
- a second circuit for generating complementary, non-overlapping first and second PWM signals in response to the generation of the PWM signal, wherein the first and second PWM signals are used for controlling the first and second switches, respectively;
- a first galvanic isolation (GI) circuit coupled between the first circuit and the second circuit.
5 more elements
An apparatus comprising:
- a first switch coupled between a first voltage node and a common node;
- a second switch coupled between the common node and a second voltage node;
- a first circuit for generating a pulse width modulation (PWM) signal;
- a second circuit for generating complementary, non-overlapping first and second PWM signals in response to the generation of the PWM signal, wherein the first and second PWM signals are used for controlling the first and second switches, respectively;
- a first galvanic isolation (GI) circuit coupled between the first circuit and the second circuit;
- a first driver comprising an output node coupled to the first switch;
- a second GI circuit coupled between the second circuit and an input node to the first driver.
4 more elements
An apparatus comprising:
- a first switch coupled between a first voltage node and a common node;
- a second switch coupled between the common node and a second voltage node;
- a first circuit for generating a pulse width modulation (PWM) signal;
- a second circuit for generating complementary, non-overlapping first and second PWM signals in response to the generation of the PWM signal, wherein the first and second PWM signals are used for controlling the first and second switches, respectively;
- a first galvanic isolation (GI) circuit coupled between the first circuit and the second circuit;
- wherein the first GI circuit comprises a first capacitor coupled in series between the first circuit and the second circuit;
- wherein the first GI circuit comprises a modulator and a demodulator with the first capacitor coupled in series between the modulator and the demodulator, wherein the modulator is configured to receive and modulate a first carrier signal using the PWM signal.
4 more elements
An apparatus comprising:
- a first galvanic isolation (GI) circuit comprising:
- a carrier signal generator for generating a carrier signal;
- a modulator for modulating the carrier signal using a signal received at an input of the modulator;
- a demodulator;
- a first capacitor coupled in series between the modulator and the demodulator;
- a second capacitor coupled in series between the carrier signal generator and the demodulator.
3 more elements
A method comprising:
- a carrier signal generating circuit generating a carrier signal;
- a modulation circuit receiving an input signal and modulating the carrier signal using the input signal;
- a demodulation circuit demodulating a signal it receives from the modulation circuit via a first capacitor coupled in series between the modulation circuit and the demodulation circuit, using a signal the demodulation circuit receives from the carrier signal generating circuit via a second capacitor, which is coupled in series between the carrier signal generating circuit and the demodulation circuit.
Dependencies are inferred from the claim text.