A simple current mode preamplifier for electron multipliers with high voltage biased anode

1996 ◽  
Vol 67 (12) ◽  
pp. 4120-4123 ◽  
Author(s):  
Seong‐Heon Seo ◽  
Hong‐Young Chang ◽  
S. K. Kim
Keyword(s):  
High Voltage ◽  
Current Mode

A Dual-Mode High-Voltage High-Efficiency Peak-Current-Mode Asynchronous Buck Converter

2016 ◽  
Vol 25 (11) ◽  
pp. 1650136 ◽  
Author(s):  
Zhaohan Li ◽  
Yongcheng Ji ◽  
Shu Yang ◽  
Yuchun Chang
Keyword(s):  
High Voltage ◽  
High Efficiency ◽  
Load Condition ◽  
Reducing Power ◽  
Current Mode ◽  
Buck Converter ◽  
Maximum Efficiency ◽  
Maximum Output ◽  
Peak Current ◽  
Light Load

This paper proposes a high-voltage high-efficiency peak-current-mode asynchronous DC–DC step-down converter operating with dual operation modes. The asynchronous buck converter achieves higher efficiency in light load condition compared to synchronous buck converters. Furthermore, the proposed buck converter switches operation mode automatically from pulse-width modulation (PWM) mode to pulse-skipping mode (PSM). By reducing power MOS on-state resistance and optimizing rise/fall time of switches, the proposed buck converter also obtains high efficiency under heavy load condition. The maximum efficiency of the proposed buck converter is 92.9%, implemented with 0.35[Formula: see text][Formula: see text]m BCDMOS 2P3M process, and the total size is 1.1[Formula: see text] 1.2[Formula: see text]mm2. The input range and output range of the converter are 6–30 V, and ([Formula: see text]–3) V, respectively, with the maximum output current of 3 A. Moreover, its built-in current loop leads to good transient response characteristics. Therefore, it can be used widely in communication system and 12 V/24 V distributed power system.

scholarly journals Study of the operating modes of the high voltage power source for barrier type discharge excitation

Doklady BGUIR ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 46-51
Author(s):  
A. L. Barakhoev ◽  
O. I. Tikhon ◽  
V. V. Tuboltsev
Keyword(s):  
High Voltage ◽  
Atmospheric Pressure ◽  
Output Voltage ◽  
Current Mode ◽  
Voltage Divider ◽  
Power Source ◽  
Operating Frequency ◽  
Switching Frequency ◽  
Lc Circuit ◽  
Barrier Type

The issues related to the features of operation and modes setting of a high-voltage switching power source based on a sequential autonomous resonant inverter with reverse diodes used to excite an atmospheric pressure barrier type discharge are discussed in the article. It is indicated that the characteristic features of the autonomous resonant inverters operation are the occurrence of damped voltage fluctuations in the LC circuit of the inverter, as well as the dependence of the output alternating voltage on the ratio of the inverter operating frequency (thyristor switching frequency) to the natural resonant frequency of the LC circuit. Depending on this ratio, the inverter can operate in discontinuous, boundary and continuous current mode. The amplitude and shape of the inverter output voltage were controlled using a 1:1000 voltage divider with a C1-65A oscilloscope. The shape of the gate trigger pulses was obtained using a C1-167 oscilloscope. It is established that when the gate trigger pulses are asymmetrical relative to each other due to the operation features of the step-up transformers, the value of the alternating high-voltage at the inverter output is insufficient to excite the atmospheric pressure barrier type discharge. In the case of the gate trigger pulses symmetry, the output voltage of the inverter stage reaches the values required for the breakdown of the dielectric medium. Oscillograms of the inverter output voltage while adjusting its operating frequency are obtained. It is shown that the amplitude value of the voltage at the gas-discharge load increases as the operating frequency of the inverter increases. For the gate trigger pulses frequency of 250 Hz the value of the inverter output voltage amplitude was 3.4 kV, for 460 Hz – 4.0 kV, and for 550 Hz – 4.2 kV.

scholarly journals Slope Compensation Design for a Peak Current-Mode Controlled Boost-Flyback Converter

2018 ◽  
Author(s):  
Juan-Guillermo Muñoz ◽  
Guillermo Gallo ◽  
Fabiola Angulo ◽  
Gustavo Osorio
Keyword(s):  
High Voltage ◽  
High Efficiency ◽  
Power Converters ◽  
Mathematical Expression ◽  
Current Mode ◽  
Input Voltage ◽  
Switching Frequency ◽  
Peak Current ◽  
Flyback Converter ◽  
Coupled Inductors

Power converters with coupled inductors are very promising due to the high efficiency and high voltage gain. Apart from the aforementioned advantages, the boost-flyback converter reduces the voltage stress on the semiconductors. However, to obtain good performance with high voltage gains, the controller must include two control loops (current and voltage), and a compensation ramp. One of the most used control techniques for power converters is the peak current-mode control with compensation ramp. However, in the case of a boost-flyback converter there is no mathematical expression in the literature, to compute the slope of the compensation ramp. In this paper, a formula to compute the slope of the compensation ramp is proposed in such a way that a stable period-1 orbit is obtained. This formula is based on the values of the circuit parameters, such as inductances, capacitances, input voltage, switching frequency and includes some assumptions related to internal resistances, output voltages, and some other electrical properties related with the physical construction of the circuit. The formula is verified numerically using the saltation matrix and experimentally using a test circuit.

scholarly journals A Hybridization of Cuk and Boost Converter Using Single Switch with Higher Voltage Gain Compatibility

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2312 ◽  
Author(s):  
M. Karthikeyan ◽  
R. Elavarasu ◽  
P. Ramesh ◽  
C. Bharatiraja ◽  
P. Sanjeevikumar ◽  
...  
Keyword(s):  
High Voltage ◽  
Simulation Study ◽  
Circuit Complexity ◽  
Current Mode ◽  
Boost Converter ◽  
Maximum Efficiency ◽  
Voltage Gain ◽  
High Voltage Gain ◽  
Circuit Components ◽  
And Performance

In the current era, the desire for high boost DC-to-DC converter development has increased. Notably, there has been voltage gain improvement without adding extra power switches, and a large number of passive components have advanced. Magnetically coupled isolated converters are suggested for the higher voltage gain. These converters use large size inductors, and thus the non-isolated traditional boost, Cuk and Sepic converters are modified to increase their gain by adding an extra switch, inductors and capacitors. These converters increase circuit complexity and become bulky. In this paper, we present a hybrid high voltage gain non-isolated single switch converter for photovoltaic applications. The proposed converter connects the standard conventional Cuk and boost converter in parallel for providing continuous current mode operation with the help of a single power switch, which gives less voltage stress on controlled switch and diodes. The proposed hybrid topology uses a single switch with a lower component-count and provides a higher voltage gain than non-isolated traditional converters. The converter circuit mode of operation, operating performance, mathematical derivations and steady-state exploration and circuit parameters design procedures are deliberated in detail. The proposed hybrid converter circuit components, voltage gain and performance, were compared with other topologies in the literature. The MATLAB/Simulink simulation study and microcontroller-based experimental laboratory prototype of 150 W were implemented. The simulation study and experimentation results were confirmed to be a satisfactory agreement with the theoretical analysis. This topology produced non-inverting output in continuous input current mode using a single switch with high voltage gain (≈5.116 gain) with a maximum efficiency of 92.2% under full load.

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