DC chopper circuit of Matlab / Simulink Simulation
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0 Introduction
In power electronics technology, will be a DC voltage through the power electronic converter transform to another fixed or adjustable voltage value of the transform, known as the DC-DC conversion. DC conversion circuit uses a very wide range, including the DC motor drive, switching power supply, single-phase power factor correction, as well as other areas for AC-DC power supply.
Discussed here PWM (pulse width modulation) control circuit of the step-down (Buck Chopper), and visualization applications matlab simulation tool Simulink, the buck-boost circuit and the circuit (Boost-Buck Chopper) conducted a modeling, Simulation results and analysis, not only to avoid the cumbersome process of mapping and calculating, but also try to be a kind of intuitive, efficient DC analysis of the new method of circuit transformation.
1 Working principle of DC chopper
DC step-down chopper circuit schematic in Figure 1 (a) as shown. Map with an ideal switch S on behalf of the actual power electronic switching devices; R for pure resistive load. When the switch S connected in time ton, the added load on the resistance of the voltage U. DC power supply equal to Ud. When the switch S in the off time toff, the output voltage to zero, DC transform waveform in Figure 1 (b) below.
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Average output voltage as follows:
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Where: ton for the chopper switch S in a cycle of on-time; toff for the chopper switch S in a cycle time of the turn-off; Ts for the chopper cycle, T = ton + t0ff; D for the duty cycle, D = ton / Ts.
This shows that the change in on-duty cycle D, Chopper will be able to control the output voltage U. Size. Because D is between 0 ~ 1, the coefficient changes, so the output voltage U. The total is less than the input voltage Ud, which is step-down output.
DC chopper 2 Modeling and Simulation
2.1 Simulation Model and Parameter Settings
(1) constituted by the IGBT DC step-down chopper circuit (Buck Chop-per) modeling and parameter setting
Figure 2, composed of the grounds of IGBT simulation model Buck DC-DC converter, IGBT according to the default parameter settings, and to remove the buffer circuit, that is, Rs = 5 ΩQ, Cs = 0; voltage source parameters from Us = 200 V, E = 80 V; load parameters R = 10 Ω, L = 5 mH.
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(2) DC step-down chopper circuit simulation
Open the Simulation Parameters window, select ode23tb algorithm, relative error is set to 1e-03, the beginning of simulation time is set to O, stop the simulation time is set to O.01 s, the control pulse cycle is set to O.001 s (frequency of 1 000Hz), control 50% duty cycle pulse. After setting the parameters, start simulation, the simulation results of Figure 3.
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As can be seen from Figure 3, the load on the voltage of 100 V, 160 V, 80 V, to meet the
2.2 DC Buck Chopper (. Boost-Buck Chopper) Simulation
Buck Chopper average output voltage as follows:
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Where: negative sign that the output voltage and input voltage RP. When D = O.5 pm, U. = Ud; when D> O.5 when, U. > Ud, for step-up transform; when D <0.5 pm, u. <Ud, for step-down transformation.
Figure 4 gives the composition of the IGBT components Buck Chopper circuit simulation model, IGBT parameters set by default and to remove the buffer circuit, load R = 50 Ω, c = 3e-05 F, slip inductance L = 5 mH. Start simulation, the simulation results of Figure 5.
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As can be seen from Figure 5, the load on the voltage of 100 V, 33 V, 300 V, to meet the
Buck chopper and with theoretical analysis.
3 Conclusion
Through the above analysis of the simulation process can be obtained the following conclusions: (1) DC Converter mainly controlled the whole power electronic devices as the switching device, by controlling the main circuit and disconnect the connection will be a constant of the DCintermittent square wave, the post-filter into a voltage adjustable DC output voltage. The use of Simulink to buck Buck Chopper Chopper and the simulation results carried out a detailed analysis, using conventional circuit analysis method has been to compare the output voltage waveform, and further verified the correctness of simulation results.
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