Nonlinear Modeling and Analysis of Resonant Inverter Tuning Loops With Voltage-Pump Phase-Frequency Detector

Karaca, H.; Kılınç, Selçuk

doi:10.1109/tpel.2005.854037

Cited by 11 publications

(20 citation statements)

References 12 publications

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“…3(b) shows the equivalent circuit model of the class-D inverter. The switches of the class-D inverter are operated at above the resonant frequency in order to achieve ZVS during turn off [24], [25]. Conventionally, class-D inverter switches are operated with pulse width modulated gate pulses.…”

Section: B Analysis Of a Class-d Invertermentioning

confidence: 99%

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Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications

Nagarajan¹,

Sathi²

2015

Journal of Power Electronics

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Resonant converters are well suited for induction heating (IH) applications due to their advantages such as efficiency and power density. The control systems of these appliances should provide smooth and wide power control with fewer losses. In this paper, a simple phase locked loop (PLL) based variable duty cycle (VDC) pulse density modulation (PDM) power control scheme for use in class-D inverters for IH loads is proposed. This VDC PDM control method provides a wide power control range. This control scheme also achieves stable and efficient Zero-Voltage-Switching (ZVS) operation over a wide load range. Analysis and modeling of an IH load is done to perform a time domain simulation. The design and output power analysis of a class-D inverter are done for both the conventional pulse width modulation (PWM) and the proposed PLL based VDC PDM methods. The control principles of the proposed method are described in detail. The validity of the proposed control scheme is verified through MATLAB simulations. The PLL loop maintains operation closer to the resonant frequency irrespective of variations in the load parameters. The proposed control scheme provides a linear output power variation to simplify the control logic. A prototype of the class-D inverter system is implemented to validate the simulation results.

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Section: B Analysis Of a Class-d Invertermentioning

confidence: 99%

“…Typically, the class-D operation mode implies that C s is much lower than C r [25]- [28] . As a result, the switching waveforms in the inverter have a direct impact on all of the inverter losses.…”

Section: Design Procedures Of the Circuit Constraintsmentioning

confidence: 99%

Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications

Nagarajan¹,

Sathi²

2015

Journal of Power Electronics

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“…In this condition the charge-pump circuit is charging the capacitor of the loop filter. The processes of charging and discharging the loop filter's capacitor are nonlinear and depend on the resonant tank parameters and the charge-pump circuit [11]. However, in this paper the input voltage has a low slew rate and helps the PLL to track the resonant frequency at the start-up or zero crossing intervals.…”

Section: Principle Of Operationmentioning

confidence: 99%

“…The important parameters of the PLL circuit are the pump voltage V p , the LF's resistor and capacitor, the center frequency f c and the gain of the VCO unit, K VCO [11].…”

Section: Principle Of Operationmentioning

confidence: 99%

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Single-Phase Current Source Induction Heater with Improved Efficiency and Package Size

Namadmalan¹,

Moghani²

2013

Journal of Power Electronics

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This paper presents a modified Current Source Parallel Resonant Push-pull Inverter (CSPRPI) for single phase induction heating applications. One of the most important problems associated with current source parallel resonant inverters is achieving ZVS in transient intervals. This paper shows that a CSPRPI with the integral cycle control method has dynamic ZVS. According to this method, it is the Phase Locked Loop (PLL) circuit that tracks the switching frequency. The advantages of this technique are a higher efficiency, a smaller package size and a low EMI in comparison with similar topologies. Additionally, the proposed modification results in a low THD of the ac-line current. It has been measured as less than %2. To show the validity of the proposed method, a laboratory prototype is implemented with an operating frequency of 80 kHz and an output power of 400 W. The experimental results confirm the validity of the proposed single phase induction heating system.

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Powering Implantable Telemetry Devices from Localized Magnetic Fields

McCormick

Nielsen

et al. 2007

2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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This paper presents a novel method of inductively powering an implantable telemetry device over a large area. The system is based around an array of individually tuned series resonant circuits distributed across a charging pad. By varying the frequency of the driving voltage, the location of the charging field is changed. Presented are a method of controlling the resonant frequency and techniques for determining the geometry of the charging pad. Results from a nine coil system operating between 97 kHz and 209 kHz are given which can deliver 100 mW to an implanted telemeter at a height of 5cm above the charging pad.

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Nonlinear Modeling and Analysis of Resonant Inverter Tuning Loops With Voltage-Pump Phase-Frequency Detector

Cited by 11 publications

References 12 publications

Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications

Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications

Single-Phase Current Source Induction Heater with Improved Efficiency and Package Size

Powering Implantable Telemetry Devices from Localized Magnetic Fields

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