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Paper Abstract and Keywords
Presentation 2020-08-06 13:00
A control circuit design of power converter with time-division input impedance modulation for energy transducer with high output impedance
Kazuma Koketsu, Toru Tanzawa (Shizuoka Univ.)
Abstract (in Japanese) (See Japanese page) 
(in English) This paper proposes a practical control circuit design of power converter for energy transducer with high output impedance. In conventional control circuit systems, the input voltage of the power converter is set so that the output power becomes maximum. In reality, this operating point voltage can be lower than the lower limit of the supply voltage at whicih the power converter can work. A proposed control circuit enables the power converter to operate when the output voltage is lower than V_PP and the input voltage is higher than a specified voltage V_DD. As a result, the input impedance Z_CPin of the power converter can be low enough to extract power from the energy transducer via a power supply capacitor C_DD when the power converter is enabled. The power is input from the power supply capacitor C_DD to the converter with low impedance. On the other hand, Z_CPin can be high enough to charge up C_DD via the energy transducer when the power converter is disabled. As a result, 1) the operating point of the input voltage can be controlled to be higher than the minimum supply voltage, 2) a maximum power can be extracted, and 3) the output voltage is controlled to be the target voltage. The proposed circuit system was fabricated in 65nm 1V CMOS and its operation was verified. As a result, the proposed integrated circuit converts an output power of 50µW at an output voltage of 2.5V from a thermoelectric energy transducer with an open circuit voltage of 0.9V and output impedance of 400Ω.
Keyword (in Japanese) (See Japanese page) 
(in English) IoT / Energy harvesting / Thermoelectric generator / DC/DC / Charge pump / / /  
Reference Info. ITE Tech. Rep.
Paper #  
Date of Issue  
ISSN Print edition: ISSN 1342-6893  Online edition: ISSN 2424-1970
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Conference Information
Conference Date 2020-08-06 - 2020-08-07 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Analog, Mixed Analog and Digital, RF, and Sensor Interface, Low Voltage/Low Power Techniques, Novel Devices/Circuits, and the Applications 
Paper Information
Registration To IEICE-ICD 
Conference Code 2020-08-ICD-SDM-IST 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A control circuit design of power converter with time-division input impedance modulation for energy transducer with high output impedance 
Sub Title (in English)  
Keyword(1) IoT  
Keyword(2) Energy harvesting  
Keyword(3) Thermoelectric generator  
Keyword(4) DC/DC  
Keyword(5) Charge pump  
1st Author's Name Kazuma Koketsu  
1st Author's Affiliation Shizuoka University (Shizuoka Univ.)
2nd Author's Name Toru Tanzawa  
2nd Author's Affiliation Shizuoka University (Shizuoka Univ.)
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Date Time 2020-08-06 13:00:00 
Presentation Time 25 
Registration for IEICE-ICD 
Paper #  
Volume (vol) ITE-44 
Number (no)  
#Pages ITE- 
Date of Issue  

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