• Title/Summary/Keyword: Charge Pump

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A New Capacitive Sensing Circuit using Modified Charge Transfer Scheme

  • Yeo, Hyeop-Goo
    • Journal of information and communication convergence engineering
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    • v.9 no.1
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    • pp.78-82
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    • 2011
  • This paper proposes a new circuit for capacitive sensing based on Dickson's charge pump. The proposed touch sensing circuit includes three stages of NMOS diodes and capacitors for charge transfer. The proposed circuit which has a simplified capacitive touch sensor model has been analyzed and simulated by Spectre using Magna EDMOS technology. Looking from the simulation results, the proposed circuit can effectively be used as a capacitive touch sensing circuit. Moreover, a simple structure can provide maximum flexibility for making a digitally-controlled touch sensor driver with lowpower operations.

Design of Charge Pump Circuit for Floating Gate Power Supply of Intelligent Power Module (Intelligent Power Module의 플로팅 게이트 전원 공급을 위한 전하 펌프 회로의 설계)

  • Lim, Jeong-Gyu;Chung, Se-Kyo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.13 no.2
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    • pp.135-144
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    • 2008
  • A bootstrap circuit is widely used for the floating gate power supply of Intelligent power module (IPM). A bootstrap circuit is simple and inexpensive. However, the duty cycle and on-time are limited by the requirement to refresh the charge in the bootstrap capacitor. And the value of the bootstrap capacitor should be increased as the switching frequency decreases. A charge pump circuit can be used to overcome the problems. This paper deals with an analysis and design of a charge pump circuit for the floating gate power supply of an IPM. The simulation and experiment are carried out for an induction motor drive system. The results well verifies the validity of the proposed circuit and design method.

Phase-Locked Loop with a loop filter consisting of a capacitor and a charge pump functioned as resistor (저항 역할을 하는 전하펌프와 하나의 커패시터로 구성된 루프 필터를 가진 위상고정루프)

  • Park, Jong-Youn;Choi, Hyek-Hwan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.11
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    • pp.2495-2502
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    • 2012
  • This paper presents a new structure of phase looked loop (PLL) for replacing a process sensitive resistor in loop filter with an additional charge pump (CP). The additional charge pump works as a resistor in a loop filter. The output of two charge pumps changes same direction according to process variation. The simulation results according to process conditions(SS/TT/FF) demonstrate that the proposed PLL works properly with process variations. It has been designed with a 1.8V $0.18{\mu}m$ CMOS process and proved by simulation with HSPICE.

Design of a Bidirectional AC-DC Converter using Charge Pump Power Factor Correction Circuit (전하펌프 역률개선 회로를 적용한 양방향성 AC-DC Converter 설계)

  • Ko, Seok-Cheol;Lim, Sung-Hun;Han, Byoung-Sung
    • Proceedings of the KIEE Conference
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    • 2001.04a
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    • pp.227-230
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    • 2001
  • This paper deals with a bidirectional ac-dc converter used in ups system application. We propose a Voltage-Source-Charge-Pump-Power-Factor-Correction(VS-CPPFC) ac-dc converters. First of all, we propose a charge pump power-factor-correction converter. Secondly, we derive and analyse a unity power factor condition. The proposed topology is based on a half-bridge for the primary and a current-fed push pull for the secondary side of a high frequency isolation transformer. The advantage of bidirectional flow of power achieved by using the same power components is that the circuit is simple and efficient. And the galvanically isolated topology is specially attractive in battery charge/discharge circuits in ups system. We design equivalent model for the steady-state circuit and analyse operation waveforms for each mode. We show that the proposed model can be applied to ups system by simulation processes.

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The Performance of a Heat Pump with a Variation of Expansion Valve at Various Charging Conditions (냉매 충전량과 팽창장치 변화에 따른 열펌프 시스템의 성능특성에 관한 연구)

  • 최종민;김용찬
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.8
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    • pp.661-666
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    • 2003
  • Constant area expansion devices such as capillary tubes, short tube orifices are being gradually replaced with electronic expansion valves (EEVs) because of increasing focus on comfort and energy conservation. In this study, the performance of a water-to-water heat pump as a function of refrigerant charge is investigated in steady state, cooling mode operation with expansion devices of a capillary tube and an EEV. The performance of the capillary tube system varies drastically according to the change of refrigerant charge amount and inlet temperature of the secondary fluid in the condenser. Cooling capacity and COP of the EEV system show little dependence on the refrigerant charge, while those are strongly dependent on the secondary fluid temperature at the condenser inlet. In general, for a wide range of operating conditions the EEV system shows much higher performance as compared with the capillary tube system. The performance of the EEV system can be optimized by adjusting EEV opening to maintain a constant superheat at all test conditions.

A Design of Power Management IC for CCD Image Sensor (CCD 이미지 센서용 Power Management IC 설계)

  • Koo, Yong-Seo;Lee, Kang-Yoon;Ha, Jae-Hwan;Yang, Yil-Suk
    • Journal of IKEEE
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    • v.13 no.4
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    • pp.63-68
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    • 2009
  • The power management integrated circuit(PMIC) for CCD image sensor is presented in this study. A CCD image sensor is very sensitive against temperature. The temperature, that is heat, is generally generated by the PMIC with low efficiency. Since the generated heat influences performance of CCD image sensor, it should be minimized by using a PMIC which has a high efficiency. In order to develop the PMIC with high efficiency, the input stage is designed with synchronous type step down DC-DC converter. The operating range of the converter is from 5V to 15V and the converter is controlled using PWM method. The PWM control circuit consists of a saw-tooth generator, a band-gap reference circuit, an error amplifier and a comparator circuit. The saw-tooth generator is designed with 1.2MHz oscillation frequency. The comparator is designed with the two stages OP Amp. And the error amplifier has 40dB DC gain and $77^{\circ}$ phase margin. The output of the step down converter is connected to input stage of the charge pump. The output of the charge pump is connected to input of the LDO which is the output stage of the PMIC. Finally, the PMIC, based on the PWM control circuit and the charge pump and the LDO, has output voltage of 15V, -7.5V, 3.3V and 5V. The PMIC is designed with a 0.35um process.

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A PLL with an unipolar charge pump and a loop filter consisting of sample-hold capacitor and 2nd-order RC filter (2차-RC 필터와 Sample-Hold 커패시터로 구성된 루프 필터와 단방향 전하펌프를 가진 PLL)

  • Baek, Seung-Ha;Choi, Young-Shig
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.10
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    • pp.2380-2386
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    • 2013
  • A PLL with an unipolar charge pump and a loop filter consisting of sample-hold capacitor and 2nd-order RC filter has been proposed. The goal of the proposed PLL is the suppression of reference spur which is caused by charge pump mismatch. It also improves phase noise characteristic. It has been designed with a 1.8V $0.18{\mu}m$ CMOS process and proved by HSPICE simulation.

Mixed-Mode Simulations of Touch Screen Panel Driver with Capacitive Sensor using Modified Charge Pump Circuit (Charge pump 기반 정전 센싱 회로를 이용한 터치스크린 패널 드라이버의 혼성모드 회로 분석)

  • Yeo, Hyeop-Goo;Jung, Seung-Min
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2011.10a
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    • pp.875-877
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    • 2011
  • This paper introduces a touch screen panel driver using modified charge pump circuit. The touch screen panel driver is composed of an analog circuit part which senses a touch and a digital circuit which analyse the sensed signal. To verify the functions the touch screen panel driver, a mixed-mode circuit was built and simulated using Cadence Spectre. The digital circuits were modeled with Verilog-A in order to interface with the analog circuits and verify the functionalities of the driver with less simulation time. From the simulation results, we can verify the reliable operations of the simple structured touch screen panel driver which does not include an ADC.

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A Study on the Optimum Design of Charge Pump PLL with Dual Phase Frequency Detectors (두 개의 Frequency Detector를 가지고 있는 Charge Pump PLL 의 최적설계에 관한 연구)

  • Woo, Young-Shin;Jang, Young-Min;Sung, Man-Young
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.50 no.10
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    • pp.479-485
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    • 2001
  • In this paper, we introduce a charge pump phase-locked loop (PLL) architecture which employs a precharge phase frequency detector (PFD) and a sequential PFD to achieve a high frequency operation and a fast acquisition. Operation frequency is increased by using the precharge PFD when the phase difference is within $-{\pi}{\sim}{\pi}$ and acquisition time is shortened by using the sequential PFD and the increased charge pump current when the phase difference is larger than ${\pm}{\pi}$. So error detection range of the proposed PLL structure is not limited to $-{\pi}{\sim}{\pi}$ and a high frequency operation and a higher speed lock-up time can be achieved. The proposed PLL was designed using 1.5 ${\mu}m$ CMOS technology with 5V supply voltage to verify the lock in process. The proposed PLL shows successful acquisition for 200 MHz input frequency. On the other hand, the conventional PLL with the sequential PFD cannot operate at up to 160MHz. Moreover, the lock-up time is drastically reduced from 7.0 ${\mu}s\;to\;2.0\;{\mu}s$ only if the loop bandwidth to input frequency ratio is regulated by the divide-by-4 counter during the acquisition process. By virtue of this dual PFDs, the proposed PLL structure can improve the trade-off between acquisition behavior and locked behavior.

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The performance of a heat pump with 3-piping system at various charging conditions (3관식 시스템 히트펌프의 충전량 변화에 따른 성능 특성에 관한 연구)

  • Song, In-Sik;Choi, Jong-Min;Joo, Young-Ju;Chung, Hyun-Joon;Kang, Hoon;Kim, Yong-Chan
    • Proceedings of the SAREK Conference
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    • 2008.06a
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    • pp.288-293
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    • 2008
  • The cooling load in winter is significant in many commercial buildings and hotels because of the usage of office equipments and the high efficiency of wall insulation. The development of a multi-heat pump that can cover heating and cooling simultaneously for each indoor unit is required. In this study, the performance of a multi-heat pump with 3-piping system was investigated as a function of refrigerant charge and its performance was analyzed in cooling mode, heating mode, and heat recovery mode. COP in the heating or cooling mode showed little dependence on refrigerant charge at overcharge conditions, while those were strongly dependent on refrigerant charge at undercharge conditions and outdoor inlet temperature. In the heat recovery mode, the performance of the system was very sensitive to charge amount at all conditions. Optimum charge amount in the heat recovery mode was 14% lower than that in the cooling mode at the standard condition because the refrigerant only passed the indoor units. It is required to store the excessive refrigerant charge in a storage tank to optimize the system performance at operating modes.

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