A Novel Buck Converter with Constant Frequency Controlled Technique

Chou, Hsiao-Hsing; Chen, Hsin-Liang

doi:10.3390/en14185911

Cited by 5 publications

(15 citation statements)

References 28 publications

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“…(B) Constant frequency mechanism [28] The work of this module mainly makes the switching frequency constant. The module is composed of a frequency detector.…”

Section: Proposed Control Schemementioning

confidence: 99%

“…Many studies [29][30][31][32] about modeling ways are proposed. Chou et al [22,28] presents the design procedure in detail. The mathematical model is built through Reference [32] in this paper.…”

Section: Theoretical Analysis 41 Mathematical Modelmentioning

confidence: 99%

“…Therefore, we choose a suitable wp to make the system stable. The design procedure is described in [22,28] and is verified by MathCAD and SIMPLIS. In Figure 14, the K i , R O , R 3 , and C 1 are the key parameters, and the relations are shown in Equations ( 1)-( 3).…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Therefore, we choose a suitable w p to make the system stable. The design procedure is described in [22,28] and is verified by MathCAD and SIMPLIS.…”

Section: Mathematical Modelmentioning

confidence: 99%

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Design of the Buck Converter without Inductor Current Sensor

Chou

2022

Electronics

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This paper proposes a novel control scheme for the buck converter without an inductor current sensor. The architecture of the proposed buck converter is simple and suitable for integration and mass production. It employs an output-voltage-measurement method to determine the switch ON time; therefore, the current sensor is not required. The design specification targets the application with a standard battery power source to generate the low voltages for low-power MCU or ASIC. The load current range aims for several hundred milliamps. The proposed control scheme is analyzed and simulated by SIMPLIS. The control scheme, theoretical analysis, circuit realization, contributions, advantages, and simulation results are presented in this paper. Furthermore, the circuit can be fabricated by a 0.35 μm CMOS process.

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“…(B) Constant frequency mechanism [28] The work of this module mainly makes the switching frequency constant. The module is composed of a frequency detector.…”

Section: Proposed Control Schemementioning

confidence: 99%

Section: Theoretical Analysis 41 Mathematical Modelmentioning

confidence: 99%

Section: Mathematical Modelmentioning

confidence: 99%

“…Therefore, we choose a suitable w p to make the system stable. The design procedure is described in [22,28] and is verified by MathCAD and SIMPLIS.…”

Section: Mathematical Modelmentioning

confidence: 99%

See 2 more Smart Citations

Design of the Buck Converter without Inductor Current Sensor

Chou

2022

Electronics

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“…Frequency control techniques have been employed in DC-DC converters to keep the switching frequency constant, instead of a phase-locked loop (PLL) [13]. The objective of frequency response identification for DC-DC converters is to ensure high accuracy, flexible operation in open or closed loop modes, and the optimal performance of the converter [14].…”

Section: Introductionmentioning

confidence: 99%

Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application

2021

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In this paper, a comparative analysis of the average switch/inductor current between ideal and non-ideal buck and synchronous buck converters is performed and verified against a standard LTspice model. The mathematical modeling of the converters was performed using volt-sec and amp-sec balance equations and analyzed using MATLAB/Simulink. The transients in the output voltage and the inductor current were observed. The transfer function of the switch current to the duty cycle (Gid) in open loop configuration for low-power converters operating in continuous conduction mode (CCM) was modeled using thestate space averaging (SSA) technique and analyzed using MATLAB/Simulink. Initially, using the volt-sec and amp-sec, balance equations for the converters were modeled. The switch current to duty ratio (Gid) was derived using the SSA technique and verified using standard average models available in LTspice software. Though the Gid was derived using various methods in earlier works, the analyses of parameters such as low frequency gain, stability, resonant frequency and the location of poles and zeros were not presented. It was observed that the converters were stable, and the non-ideal converter showed smaller resonant frequency than the ideal converter due to the equivalent series resistances (ESR) of the inductor and the capacitor. The non-ideal converters showed higher stability than the ideal converters due to the placement of the poles closer to the s-plane. However, the Gid of the non-ideal converters remained the same in the open loop configuration.

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A New Control Scheme for the Buck Converter

et al. 2023

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In this paper, a new control scheme for buck converters was proposed. The buck converter utilizes the dual control loop to improve transient response and has the constant switching frequency. The control scheme is mainly as follows: (a) The switch-ON time is regulated by the constant frequency mechanism. (b) The switch-OFF time is regulated by the output voltage. The spec/features of the proposed converter are listed as: (1) The buck converter has an output of 1.0–2.5 V for the input of 3.0–3.6 V. The load current ranges from 100 mA to 500 mA. (2) The actual current sensor is not required. (3) The simulation results show that the recovery time is less than 1.6 μs during load changes. (4) The variation in switching frequency is smaller than 1.05% over the output range of 1.0–2.5 V. (5) This circuit can be fabricated in future by UMC 0.18 μm 1P6M CMOS processes. This paper depicts the control scheme, theoretical analysis, and implementation.

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A Novel Buck Converter with Constant Frequency Controlled Technique

Cited by 5 publications

References 28 publications

Design of the Buck Converter without Inductor Current Sensor

Design of the Buck Converter without Inductor Current Sensor

Modeling of Average Current in Non-Ideal Buck and Synchronous Buck Converters for Low Power Application

A New Control Scheme for the Buck Converter

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