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US 12,255,641 B2Granted
Isolated drive circuit and isolated driving method with improved magnetic field immunity
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorNaixing Kuang
Life of this patent
Estimating the term…
Abstract
A drive circuit configured to drive a power stage including a high voltage power switch device. The drive circuit has a transmitter configured to send a control signal, and a receiver configured to transfer a received signal to a drive signal by a first isolated capacitor loop and a second isolated capacitor loop. The first isolated capacitor loop has a same area as the second isolated capacitor loop.
Claims19
An isolated drive circuit, comprising:
- a transmitter at a primary side, configured to send a control signal;
- a first isolated capacitor loop and a second isolated capacitor loop placed between the transmitter and a receiver;
- and
- the receiver at a secondary side, configured to sample a voltage difference between a first voltage indicative of the control signal delivered by the first isolated capacitor loop and a second voltage indicative of the control signal delivered by the second isolated capacitor loop;
- wherein
- the first isolated capacitor loop comprises a first capacitor pair and a second capacitor pair placed between the primary side and the secondary side;
- and wherein
- the first capacitor pair and the second capacitor pair perform a differential transmission.
5 more elements
An isolated drive circuit, comprising:
- a first transmit circuit and a second transmit circuit, respectively configured to provide a first control signal and a second control signal;
- a first isolated capacitor loop, placed between the first transmit circuit and a receiver;
- a second isolated capacitor loop, placed between the second transmit circuit and the receiver;
- and
- the receiver, configured to sample a voltage difference between a first voltage indicative of the first control signal delivered by the first isolated capacitor loop and a second voltage indicative of the second control signal delivered by the second isolated capacitor loop;
- wherein
- the first isolated capacitor loop comprises a first capacitor pair and a second capacitor pair placed between the primary side and the secondary side;
- and
- wherein the first capacitor pair and the second capacitor pair perform a differential transmission.
6 more elements
An isolated driving method, comprising:
- sending a control signal at a primary side, and delivering the control signal to a secondary side by way of a first isolated capacitor loop to obtain a first signal;
- sending the control signal at the primary side, and delivering the control signal to the secondary side by way of a second isolated capacitor loop to obtain a second signal;
- and
- sampling a voltage difference between the first signal and the second signal;
- wherein
- the first isolated capacitor loop comprises a first capacitor pair and a second capacitor pair placed between the primary side and the secondary side;
- and wherein
- the first capacitor pair and the second capacitor pair perform a differential transmission.
5 more elements
Dependencies are inferred from the claim text.