A Single Inductor Dual Output Step-Up/Down DC-DC Converter with Hysteretic Current Control
A single-inductor dual-output, DC-DC technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve the problem that the converter cannot respond to load changes, channel crosstalk is large, Problems such as large fluctuations in the inductor current of the converter, to achieve the effects of improving conversion efficiency, reducing crosstalk, and fast transient response speed
Active Publication Date: 2019-07-26
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0003] Transient response speed and conversion efficiency are important indicators to measure the performance of DC-DC converters. The traditional PWM control method needs to wait for the next clock to respond to load changes; the existing charge pump controlled converter has the last The problem of large channel crosstalk; the control method of constant on-time or constant off-time requires a fixed period of time for charging or discharging the inductor, during which the converter cannot respond to changes in the load; the converter with tail current control exists The problem of large inductor current fluctuations
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[0028] The present invention will be described in detail below by taking the actual signal conversion process as an example.
[0029] Such as figure 1 As shown, a hysteretic current-controlled single-inductance dual-output step-up / down DC-DC converter described in this embodiment includes a first channel and a second channel, and includes a power stage, and the power stage includes a first Six PMOS tubes S 1 and the seventh PMOS transistor S 2 , the inductor current passes through the sixth PMOS transistor S 1 to the output of the first channel V o1 power supply, the inductor current passes through the seventh PMOS transistor S 2 to the output of the second channel V o2 Power supply; also includes a first charge pump circuit 21 for controlling the first channel and a second charge pump circuit 22 for controlling the second channel; also includes a hysteresis window generation circuit 3 and a state machine 4, the hysteresis The window generation circuit 3 and the state ma...
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The invention discloses a single-inductor dual-output buck / boost DC-DC converter with hysteretic current control. The single-inductor dual-output buck / boost DC-DC converter comprises a first channel,a second channel, and a power stage, wherein the power stage comprises a sixth MOS transistor S1 and a seventh MOS transistor S2, an inductive current flows through the sixth MOS transistor S1 and supplies power to an output Vo1 of a first channel, and an inductive current flows through the seventh MOS transistor S2 and supplies power to an output Vo2 of a second channel. The single-inductor dual-output buck / boost DC-DC converter further comprises a first charge pump circuit used for controlling the first channel, a second charge pump circuit used for controlling the second channel, a hysteresis window generating circuit and a state machine, wherein the hysteresis window generating circuit and the state machine are used for modulating the inductive current. The single-inductor dual-outputbuck / boost DC-DC converter has the advantages of fast transient response speed, large input and output voltage range and low crosstalk between channels.
Description
technical field [0001] The invention relates to a DC-DC converter, in particular to a hysteretic current-controlled single-inductance double-output step-up / down DC-DC converter. Background technique [0002] For those portable devices that need multiple supply voltages, a single-inductance multi-output DC-DC, that is, a DC converter with multiple switching channels, is a good choice, and because the battery voltage of portable devices will vary with The time of use changes, so the converter needs to have the function of automatic buck-boost. [0003] Transient response speed and conversion efficiency are important indicators to measure the performance of DC-DC converters. The traditional PWM control method needs to wait for the next clock to respond to load changes; the existing charge pump controlled converter has the last The problem of large channel crosstalk; the control method of constant on-time or constant off-time requires a fixed period of time for charging or disc...
Claims
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IPC IPC(8): H02M3/158
CPCH02M3/1584
Inventor 郑彦祺谢谱敏陈志坚
Owner SOUTH CHINA UNIV OF TECH