发明申请
WO2022015366A1 METHOD, SYSTEM AND APPARATUS FOR CONSTANT, HIGH SWITCHING FREQUENCY AND NARROW DUTY RATIO PWM CONTROL OF DC-DC CONVERTERS AND ACCURATE PFM CONTROL AT LIGHT LOAD
审中-公开
基本信息:
- 专利标题： METHOD, SYSTEM AND APPARATUS FOR CONSTANT, HIGH SWITCHING FREQUENCY AND NARROW DUTY RATIO PWM CONTROL OF DC-DC CONVERTERS AND ACCURATE PFM CONTROL AT LIGHT LOAD
- 申请号：PCT/US2021/013806 申请日：2021-01-18
- 公开(公告)号：WO2022015366A1 公开(公告)日：2022-01-20
- 发明人： DEARBORN, Scott , OU, Jiong
- 申请人： MICROCHIP TECHNOLOGY INCORPORATED
- 申请人地址： 2355 West Chandler Blvd.
- 专利权人： MICROCHIP TECHNOLOGY INCORPORATED
- 当前专利权人： MICROCHIP TECHNOLOGY INCORPORATED
- 当前专利权人地址： 2355 West Chandler Blvd.
- 代理机构： SLAYDEN, Bruce W., II
- 优先权： US17/145,944 2021-01-11
- 主分类号： H03K3/017
- IPC分类号： H03K3/017 ; G05F1/561 ; H02M1/0025 ; H02M1/0041 ; H02M3/157 ; H03K3/037
摘要：
DC-DC power converter control comprises current starved delay lines for phase shifting control signals that set and reset a RS flip-flop to provide controllable PWM pulse widths from narrow to wide at a clock frequency. Precise pulse width control and a guaranteed minimum pulse width for pulse frequency modulation (PFM) control the DC-DC power converter during low power demand is also provided. PFM control maintains the same pulse width while decreasing the number of pulses per second when the output voltage exceeds an upper value and increases the number of pulses per second when the output voltage is less than a lower value. Voltage-to-current converters provide control currents to the current starved delay lines that provide the control signals to the SET and RESET inputs of the RS flip-flop. A D-flip-flop may further be used to improved circuit operation when generating high duty cycle (> 50 percent) pulse widths.