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Good morning, ladies and gentlemen. Let me introduce myself. I'm Aliona Prokhorova from a group ME-101.

The subject of my presentation is energy efficiency analysis in the electronic switch of parallel quasi-resonant pulse converter with serial resonant circuit. The topic is very important for you because at the present stage of development of electronic devices, great attention is paid to the development and improvement of the network of power supplies and AC/DC converters.

My presentation will take about 20 minutes. I`ve divided my presentation into three parts. First, I'll review the principles of work, their advantages and disadvantages, and the basic problems in the circuit. The second part describes the main features of the dynamics of processes taking into account the parasitic parameters in switch. In addition, calculated currents, voltages, power dissipation on the switch. Finally, I`ll show you results of simulations and experimental research processes occurring in the real scheme. There will be time for question after my presentation.

Part 1

As you know, a necessary part of most electronic devices is the power source. Usually used without transformer source. I'd like to highlight that they have a high coefficient of performance (COP) and compatibility with the mains. High COP reached by means of a translation regulatory element in pulse mode. Therefore, an integral part of the pulse converter is a switch. Reduction of power losses can be achieved by changing the switching mode. The resonant circuit include to the diagram for this. So on the switch will be allocated the least amount of energy, if it's going to switch at zero current or voltage. So there were the quasi-resonant switching converters, which are switched at zero current or voltage (QRC ZCS, QRC ZVS).

The next slide demonstrated the schematic diagram of parallel QRC-ZCS with serial resonance circuit.

The pulse-frequency modulation is the most common means of regulating the QRC. However, this mode has a number of serious disadvantages from the point of view of the switching mode.

The disadvantages QRC include:

1) the mode, when the switching is not while zero current or voltage;

2) the effect of the parasitic values of the elements while the large switching frequency;

3) high-level dynamic power losses in the electronic switch.

Therefore, great attention should be paid to the design of the resonant circuit.

Part 2

I'd like to point out that before performing the calculation were made some assumptions. To simplify the calculation of the selected full switching period is divided into the following intervals:

a) interval of the opening VT (t0-t1);

b) interval of open state VT when the current flowing through the channel (t1-t2);

c) interval of open state VT (t2-t3);

d) interval of the closing VT (t3-t4)

The calculation allows to give numerical evaluation of the dynamics of processes at different intervals work ZCS QRC. The formula for calculate the dissipated power in the switch ZCS QRC will help to manifest that dynamic losses in zero current mode is small compared with the PWM mode. This is the main advantage QRC ZCS.

Part 3

In the study of processes that occur in the switch will be made simulation of the circuit using the program. The resulting charts and ratios will be presented in the presentation. Thank you for your attention. You can ask questions concerning my presentation.

The subject of my presentation is energy efficiency analysis in the electronic switch of parallel quasi-resonant pulse converter with serial resonant circuit. The topic is very important for you because at the present stage of development of electronic devices, great attention is paid to the development and improvement of the network of power supplies and AC/DC converters.

My presentation will take about 20 minutes. I`ve divided my presentation into three parts. First, I'll review the principles of work, their advantages and disadvantages, and the basic problems in the circuit. The second part describes the main features of the dynamics of processes taking into account the parasitic parameters in switch. In addition, calculated currents, voltages, power dissipation on the switch. Finally, I`ll show you results of simulations and experimental research processes occurring in the real scheme. There will be time for question after my presentation.

Part 1

As you know, a necessary part of most electronic devices is the power source. Usually used without transformer source. I'd like to highlight that they have a high coefficient of performance (COP) and compatibility with the mains. High COP reached by means of a translation regulatory element in pulse mode. Therefore, an integral part of the pulse converter is a switch. Reduction of power losses can be achieved by changing the switching mode. The resonant circuit include to the diagram for this. So on the switch will be allocated the least amount of energy, if it's going to switch at zero current or voltage. So there were the quasi-resonant switching converters, which are switched at zero current or voltage (QRC ZCS, QRC ZVS).

The next slide demonstrated the schematic diagram of parallel QRC-ZCS with serial resonance circuit.

The pulse-frequency modulation is the most common means of regulating the QRC. However, this mode has a number of serious disadvantages from the point of view of the switching mode.

The disadvantages QRC include:

1) the mode, when the switching is not while zero current or voltage;

2) the effect of the parasitic values of the elements while the large switching frequency;

3) high-level dynamic power losses in the electronic switch.

Therefore, great attention should be paid to the design of the resonant circuit.

Part 2

I'd like to point out that before performing the calculation were made some assumptions. To simplify the calculation of the selected full switching period is divided into the following intervals:

a) interval of the opening VT (t0-t1);

b) interval of open state VT when the current flowing through the channel (t1-t2);

c) interval of open state VT (t2-t3);

d) interval of the closing VT (t3-t4)

The calculation allows to give numerical evaluation of the dynamics of processes at different intervals work ZCS QRC. The formula for calculate the dissipated power in the switch ZCS QRC will help to manifest that dynamic losses in zero current mode is small compared with the PWM mode. This is the main advantage QRC ZCS.

Part 3

In the study of processes that occur in the switch will be made simulation of the circuit using the program. The resulting charts and ratios will be presented in the presentation. Thank you for your attention. You can ask questions concerning my presentation.

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