scholarly journals Power Efficient Current Driver Based on Negative Boosting for High-Speed Lasers

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1309
Author(s):  
Saad Arslan ◽  
Syed Asmat Ali Shah ◽  
HyungWon Kim
Keyword(s):  
Rise Time ◽  
High Speed ◽  
Supply Voltage ◽  
Cavity Surface ◽  
Switching Frequency ◽  
Parasitic Inductance ◽  
Sensing Applications ◽  
High Switching Frequency ◽  
The Wire ◽  
Short Rise Time

Vertical-cavity surface-emitting lasers (VCSELs) are commonly used in high-speed optical communication and 3D sensing applications. Both of these applications require high switching frequency and a short rise time of the VCSEL current. The parasitic inductance of the wire (connecting the driver with VCSEL) makes it challenging to achieve a short rise time, which often incur increased supply voltage and excessive power consumption. This paper utilizes a momentary boosting in supply voltage to overcome the parasitic inductance of the wire with minimal power overhead. The proposed technique uses a precalculated boosting capacitance to produce negative voltage for common-anode VCSELs. The boosting capacitance provides the required amount of charge during the rising transition and automatically disconnects itself in steady-state. Circuit simulations reveal up to three times shorter rise time at the negligible cost of less than 10% power overhead.

Design of a Crank-Slider Spool Valve for Switch-Mode Circuits With Experimental Validation

2017 ◽  
Vol 140 (6) ◽  
Author(s):  
Shaun E. Koktavy ◽  
Alexander C. Yudell ◽  
James D. Van de Ven
Keyword(s):  
Flow Rate ◽  
High Speed ◽  
Experimental Validation ◽  
Viscous Friction ◽  
Transition Time ◽  
Switching Frequency ◽  
Experimental Demonstration ◽  
High Switching Frequency ◽  
Switch Mode ◽  
Spool Valve

A challenge in realizing switch-mode hydraulic circuits is the need for a high-speed valve with fast transition time and high switching frequency. The work presented includes the design and modeling of a suitable valve and experimental demonstration of the prototype in a hydraulic boost converter. The design consists of two spools driven by crank-sliders, designed for 120 Hz maximum switching frequency at a flow rate of 22.7 lpm. The fully open throttling loss is designed for <2% of the rated pressure of 34.5 MPa. The transition time is less than 5% (0.42 ms at 120 Hz) of the total cycle and the duty cycle is adjustable from 0 to 1. Leakage and viscous friction losses in the design are less than 2% of the rated hydraulic energy per cycle. The experimental results agreed well with the model resulting in a 3% variation in transition time. The use of the high-speed valve in a pressure boosts converter demonstrated boost ratio capabilities of 1.08–2.06.

A Highly Integrated GaAs-based Module for DC-DC Regulators

2013 ◽  
Vol 2013 (1) ◽  
pp. 000604-000610 ◽  
Author(s):  
Greg J. Miller
Keyword(s):  
High Speed ◽  
Low Voltage ◽  
Field Effect Transistors ◽  
Cost Effective ◽  
Switching Frequency ◽  
Critical Element ◽  
High Current ◽  
High Switching Frequency ◽  
Gate Driver ◽  
High Level

There is a need and desire to push low voltage point-of-load voltage regulators (POL VRs) to higher switching frequencies. The main reason for this is to increase power density. Silicon MOSFET-based solutions are rapidly approaching their technology limits and are not capable of providing multi-MHz switching frequency for high current (&gt;10A) applications. Gallium Arsenide (GaAs) field effect transistors (FETs) can switch much faster, enabling cost-effective, high-current, high switching frequency POL VRs. Recent advances in GaAs technologies have enabled the demonstration of 5MHz VRs and provide a path to even higher frequency (&gt;50MHz) Power Supply in Package (PSiP) solutions. The high-speed GaAs power FETs are the “engine” to enable efficient high switching frequency POL VRs, but certain key elements must be designed appropriately to realize the desired performance. The gate driver and power path impedances must be minimized. To do this, a high level of integration is required, thus packaging is a critical element. New embedded die packaging solutions enable this high level of integration, dramatically reducing key parasitic impedances that can otherwise throttle performance, while also facilitating very compact multi-chip modules.

Experimental Investigation of a Switched Inertance Hydraulic System

2014 ◽  
Author(s):  
Min Pan ◽  
James Robertson ◽  
Nigel Johnston ◽  
Andrew Plummer ◽  
Andrew Hillis
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Small Diameter ◽  
Switched System ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Switching Frequency ◽  
Rotary Valve ◽  
High Switching Frequency ◽  
Flow Loss

This article reports on experimental investigations of a switched inertance hydraulic system (SIHS), which is designed to control the flow and pressure of a hydraulic supply. The switched system basically consists of a switching element, an inductance and a capacitance. Two basic modes, a flow booster and a pressure booster, can be configured in a three-port SIHS. It is capable of boosting the pressure or flow with a corresponding drop in flow or pressure respectively. This technique makes use of the inherent reactive behaviour of hydraulic components. A high-speed rotary valve is used to provide sufficiently high switching frequency and minimise the pressure and flow loss at the valve orifice, and a small diameter tube is used to provide an inductive effect. In this article, a flow booster is introduced as the switched system for investigation. The measured steady state and dynamic characteristics of the rotary valve are presented, and the dynamics characteristics of the flow booster are investigated in terms of pressure loss, flow loss and system efficiency. The speed of sound is measured by analysis of the measured dynamic pressures in the inertance tube. A detailed analytical model of a SIHS is applied to analyse the experimental results. Experimental results on a flow booster rig show a very promising performance for the SIHS.

scholarly journals 40 kW/L High Switching Frequency Three-Phase AC 400 V All-SiC Inverter

2013 ◽  
Vol 740-742 ◽  
pp. 1081-1084 ◽  
Author(s):  
Kensuke Sasaki ◽  
Shinji Sato ◽  
Kohei Matsui ◽  
Yoshinori Murakami ◽  
Satoshi Tanimoto ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Output Power ◽  
High Speed ◽  
Switching Frequency ◽  
Test Results ◽  
Circuit Boards ◽  
High Switching Frequency ◽  
Three Phase ◽  
Drive Circuit ◽  
Forced Air

We, the R&D Partnership for Future Power Electronics Technology (FUPET), have reported a forced-air-cooled DC 600 V three-phase AC 400 V inverter built with SiC-JFETs and SiC-SBDs and designed to attain an output power density (OPD) of 40 kW/L with a switching frequency (fSW) of 50 kHz. This paper reports the test results of this inverter attaining an OPD of 40 kW/L in operating a 3-phase motor with fSW = 50 kHz, and an OPD of more than 60 kW/L in operating an equivalent circuit with fSW = 20 kHz by adopting specialized high speed drive circuit boards.

Experimental Investigation of a Switched Inertance Hydraulic System With a High-Speed Rotary Valve

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
Min Pan ◽  
Nigel Johnston ◽  
James Robertson ◽  
Andrew Plummer ◽  
Andrew Hillis ◽  
...  
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Small Diameter ◽  
Switched System ◽  
Experimental Results ◽  
Experimental Investigations ◽  
Switching Frequency ◽  
Rotary Valve ◽  
High Switching Frequency ◽  
Flow Loss

This paper reports on experimental investigations of a switched inertance hydraulic system (SIHS), which is designed to control the flow and pressure of a hydraulic supply. The switched system basically consists of a switching element, an inductance (inertance), and a capacitance. Two basic modes, a flow booster and a pressure booster, can be configured in a three-port SIHS. It is capable of boosting the pressure or flow with a corresponding drop in flow or pressure, respectively. This technique makes use of the inherent reactive behavior of hydraulic components. A high-speed rotary valve is used to provide sufficiently high switching frequency and to minimize the pressure and flow loss at the valve orifice, and a small diameter tube is used to provide an inductive effect. In this paper, a flow booster is introduced as the switched system for investigation. The measured steady-state and dynamic characteristics of the rotary valve are presented, and the dynamics characteristics of the flow booster are investigated in terms of pressure loss, flow loss, and system efficiency. The speed of sound is measured by analysis of the measured dynamic pressures in the inertance tube. A detailed analytical model of an SIHS is applied to analyze the experimental results. Experimental results on a flow booster rig show a very promising performance for the SIHS.

scholarly journals Expansion of Operating Speed Range of High-Speed BLDC Motor Using Hybrid PWM Switching Method Considering Dead Time

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5212
Author(s):  
Ho-Jin Kim ◽  
Hyung-Seok Park ◽  
Jang-Mok Kim
Keyword(s):  
High Speed ◽  
Control Algorithm ◽  
Pulse Width Modulation ◽  
Dead Time ◽  
Control Method ◽  
Supply Voltage ◽  
Switching Frequency ◽  
Bldc Motor ◽  
Brushless Dc ◽  
Output Torque

In vehicle electrical systems with limited battery power, the output torque and speed of high-speed brushless DC (BLDC) motors can decrease due to unstable and reduced supply voltage or manufacturing errors in the motor back electromotive force (EMF). This paper presents a method that can guarantee the output performance of an inverter through a control algorithm without a separate power supply system and DC-link voltage increase. The proposed control algorithm can increase the output torque and speed of a high-speed BLDC motor by using appropriate selection and change of the inverter’s pulse width modulation (PWM) control method. In this paper, the operation and electrical characteristics of various PWM methods of BLDC motors are analyzed, and the optimal PWM method for improving the control performance of high-speed BLDC motors is presented. In addition, the relationship between the switching frequency, dead time, and voltage utilization was mathematically analyzed. Based on the results of this analysis, the proposed control algorithm automatically changes the PWM switching mode at the point where the output torque and speed need to be extended. The effectiveness and feasibility of the control method proposed in this paper is verified through the experimental results on the designed and manufactured high-speed BLDC motor system for vehicles.

Sign in / Sign up

Export Citation Format

Share Document