There are bandits gentleman, such as cutting, such as consultations, such as cut, such as grinding. - "Book of Wei Qi Austria"
I recorded this blog knowledge about the pit of my knowledge and experience to accumulate in the simulation study.
Part I: Knowledge section
1. Why series resistance and inductance waveforms of current in the circuit than the sinusoidal waveform voltage?
A: Because the inductor is an energy storage element. When the current, the voltage rises from 0, the current waveform in the circuit at R, L cooperate to approximately sinusoidal variation varies (almost a constant phase angle difference), but due to the storage voltage waveform (to induced hindered voltage increases voltage) is changed to change the hysteresis effect of the sine wave; when the current, the voltage begins to drop from a height, the current waveform in the circuit to be reduced approximately sinusoidal variations in R, L interaction (difference the same phase angle), and the voltage waveform of a voltage because of the release of the stored energy of the coil (voltage across the coil induced voltages impede reduction) acting on the hysteresis of the sinusoidal becomes smaller. The induced voltage is increased, the stronger the more, when most of the induced voltage close to the voltage of the release has also been released 0 Upon completion, so that the voltage waveform peak slant is deformed, and the current waveform is substantially sinusoidal. So it is a current waveform closer to a sine wave than the waveform of the voltage.
2. Why is it called a chopper circuit?
A: DC-DC switching converter is a DC power supply and a load indirect constituted by a power semiconductor device, with which the main control circuit is turned on and off, a constant DC to "cut" into discontinuous (discrete) of square wave, and then filtered into direct current supplied to the load voltage is adjustable. It is a device for converting a DC voltage amplitude, also known as choppers.
3. Boost boost circuit applications used in motor braking why?
Recovering energy booster circuit can be realized. Specific calculations are in the book of Mr. Wang Zhao's.
Second part: the use of some of the modules
1. Constant module
Constant module generates a real or complex constant signal. Using this module provides a constant input signal.
2. Pulse Pulse Generator (Thyristor, 6-Pulse ) module
Pulse Pulse Generator (Thyristor, 6-Pulse ) module alpha is the firing angle a, is provided here, 0 °, i.e. 0 degree gradually opened thyristor. Delay angle signal, the unit is degree. This input can be connected to a constant block may be connected to a system controller to control the pulse generator.
Wt, the angle, in radians, vary between 0 and 2 * pi, substantially synchronized (positive sequence) of a voltage converter Phase A zero. Wavelet transform signal is typically obtained by the PLL (PLL) system.
PY, supplied with the output signal of a six-pulse converter Y secondary winding six-pulse thyristor is connected. When the generator 12 is set to a pulse type parameter named output PY, a type parameter to generate a pulse output 6 named PY.
RD, the output signals to the six-pulse converter Delta (D) of the secondary windings of a six-pulse thyristor is connected. When the generator type parameter is set to 6-pulse, this output does not exist.
Block whether the blocking pulse, the pulse generator is provided to open 0, a trigger pulse with a constant off module.
3.Three-PhaseV-I Measurement模块
Three-PhaseV-I Measurement In use a label using the label can not control, it need not.
Selection voltage phase, wherein A, B, C, is the measured line voltage. Selecting the phase of voltage, wherein A, B, C is the measured voltage of each phase. a, b, c is an electrical connection in series ABC, abcc, in order to measure the phase currents.
Part III: Hang encounter
1. Algorithm Select: modeling physical nature of the system, the behavior may be generally described by the differential equations describing the system behavior modeling language. If the solution of the equation system of rapid change (quick change), and the difference between the relatively poor, often referred to as a class of equations stiff equation, compared with the model corresponding to the rigid model, also known as Stiff equation.
Briefly: Solution of the system is that there is a mutation, such as impact, like a step.
This place needs to read the requirements. Different models of different selection algorithms, this point must pay attention! ! ! !
2. The inductive load which has positive and negative stuff. matlab simulation library base element having one end marked red is positive, must pay attention to the correct connection! ! !
3. The average pay attention Take a look at the frequency set with no time RMS measurement! ! !
4. Sometimes the simulation is a simulation of the algorithm may incorrectly, there may be an average value or effective value of the frequency setting module problem. Some attention! ! !
Note: This is what I read some information and posted it to the finish. But because it did not record the primary IP address, so please see my main relevant right after finishing, if the feeling of some of the content of this article and his blog are similar, please private letter to me. I will indicate the source.