A voltage detection circuit for motor-driven adaptive dead-time control
By detecting the gate voltage of the high-side power transistor through an adaptive dead-time control circuit, the problem of increased power loss in traditional motor drive circuits is solved, adaptive dead-time control is achieved, and power consumption is reduced.
CN115940583BActive Publication Date: 2026-05-26WUXI I CORE ELECTRONICS
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Patent Information
- Application Number
- CN202211576348.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-09
- Publication Date
- 2026-05-26
- Estimated Expiration
- 2042-12-09
AI Technical Summary
Technical Problem
The fixed dead time design in traditional motor drive circuits leads to increased power loss and cannot adapt to the needs under different power supply voltages.
Method used
Design an adaptive dead-time control voltage detection circuit for motor drive. By detecting the gate voltage of the high-side power transistor, output logic control signal to control the conduction state of the low-side power transistor. Adaptive control of dead time is achieved using only one high-voltage device.
Benefits of technology
It reduces power loss caused by excessively long dead time, has a wide applicable voltage range, low power consumption, and is suitable for systems with special requirements.
✦ Generated by Eureka AI based on patent content.
Abstract
This invention discloses a voltage detection circuit for adaptive dead-time control of motor drives. The system includes AND gates AND1 and AND2, inverters INV1, INV2, and INV3, a high-side driver, a low-side driver, a voltage detection circuit, a high-side power transistor N1, and a low-side power transistor N2. The voltage detection circuit includes a high-voltage transistor NM_H, bias currents I1, I2, and I3, a power supply voltage VDD, constant-voltage transistors PM1 and PM2, constant-voltage transistor NM1, and an inverter INV4. This voltage detection circuit detects the gate voltage of the high-side power transistor. The low-side power transistor only turns on when the gate voltage drops very low, preventing shoot-through between the high and low-side power transistors. This invention can detect high-voltage signals. Its detection principle and circuit implementation are simple, using only one high-voltage device, with a small area, low power consumption, and a wide applicable voltage range. Applying this circuit enables adaptive dead-time control.
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