| Summary: | 碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 95 === In this thesis, we design switching mode DC-DC current converter based on hysteresis-controlled technique. This structure is a novel and original circuit. There is not relative circuit presented in the paper, and this technology get better driving to apply to current mode loading like Motor or OLED etc. DC-DC current converter can decrease the noise due to stray inductance effect which is generated by conducting wire. As a result, we use current converter to current mode loading will reduce the interference of noise, and increase stability and accuracy of power supply.
In the proposed DC-DC current converter is consist of power switch transistors, a comparator, a hysteresis circuit, a non-overlapping circuit and a driver circuit. The concept of hysreresis circuit is used the voltage of capacitor to be a control signal, and compare with up and down limited-voltage that be generated by hysteresis circuit, and control of power switch transistors to get output current that we expected. The control driving circuit provides non-overlapping signals that are used to switch power switch transistors in order to avoid the short-current between power switch transistors.
Hysteresis-controlled buck/boost current converter are implemented with TSMC 0.35μm 2P4M CMOS processes. The experimental results show that the buck/ buck-boost converter operation range of input current is 100mA~800mA, and the output current is 100mA~800mA. The current converter maximum efficiency could reach to 88%.
The other chip, we design novel boost circuit, and one characteristic is through closed-loop design to get expected output voltage. The other characteristic can detect the state of output current, when there is no output current, it will shut down control circuit to saving power consumption. In this work, because each pumping capacitor of charge pump is designed to 4pF that can design on-chip, so that can save circuit size. These characteristics are suitable to apply to portable electronic products. It consists of a charge pump, a load sensing circuit, a comparator, a non-overlapped circuit and a driver circuit. The charge transfer switches in this charge pump can be completely turn on and turn off, so its pumping efficiency is higher than that of the traditional designs. Moreover, the maximum gate-source and gate-drain voltages of all devices do not exceed the normal operating power supply voltage. A load sensing circuit can detect the state of output current, and shut down control circuit to saving power consumption.
In the proposed regulated charge pump is implemented with TSMC 0.35μm 2P4M CMOS processes. Under 1.5V power supply, the results of simulation show that operation range of output voltage is 1.5V~5.5V. The power consumption of circuit under no output current is 16uW
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