1. Digital signal processor microcomputer
The device adopts the high speed digital control processor as the output core, and the 32-bit double-precision algorithm is applied to produce the high-precision waveform of each phase. Because of the integrated structure, the parts are closely combined, the data transmission is short and the structure is compact. The problem of short output waveform points caused by long and narrow band of data communication lines is overcome in the direct control of notebook computer.
2. D/A conversion and low pass filtering
High precision D/A converter is used to ensure the accuracy and linearity of current and voltage across the whole range.
Due to the high density of fitting points and high fidelity of waveform, harmonic component is small, the requirement of low pass filter is very low, which has good transient characteristics and phase frequency characteristics, the amplitude frequency characteristics, easy to realize accurate phase shift, harmonic superposition, high frequency can assure very high precision.
3. Voltage, current amplifier
Has been sticking to adopt high performance linear amplifier output phase current, voltage, current, voltage source can output directly from dc to contain various frequency components of waveform, such as the combination of square wave, every harmonic superposition waveform, fault transient waveform, etc。, and the output waveform is clean and smooth, the adjacent equipment without interference, high frequency radiation can better simulate all kinds of short circuit fault current, voltage characteristics。
The power amplifier circuit adopts high - power high fidelity module power device for power output level, which combines with careful and reasonable design of heat dissipation structure with sufficient power redundancy and heat capacity。 The amplifier circuit has complete overheat, overcurrent, overpressure and short circuit protection。 When the current circuit appears overcurrent, when the voltage circuit is overloaded or short-circuited, the output power is automatically restricted, the whole amplifier circuit is shut off, and the alarm signal is displayed。 In order to prevent the large current from running down the power amplifier circuit overheating, the device set up a large current software limit。 When the current exceeds 10A, the software will be activated when the current exceeds 10A。 When the time is limited, the software will automatically turn off the power output and give warning instructions。 The larger the output current, the shorter the time limit。
4. Drive in and out
The device has eight roads and four roads。
The switching volume input circuit is compatible with the null junction and 0 ~ 250V potential contact。 In the potential way, 0 ~ 6V is the sum, 11 ~ 250V is divided。 The switching volume can be used to measure the time difference of the action time and action of each phase switch。
The driving part is isolated from the working power supply and power supply of the main engine. IN the field of suspension, there is no connection between the public end and current, the voltage part of the public end, IN and so on.
The switching potential input is directional, and the common terminal potential is positive, and the terminal potential is negative, so the potential of the public terminal is higher than that of the open terminal. When the wiring is in place, it shall be connected to the public terminal and connected to the terminal. If it is reversed, it will not be properly detected.
5. Dedicated dc power output
The device is equipped with a special adjustable dc power output, which can be used as a field test auxiliary power supply. The rated working current of the power supply is 1.5a, which can be used as the dc working power of the protective device, as well as the power of the jumper circuit. If the power supply is overloaded or short-circuited, the corresponding insurance (2A / 250V) will be burnt.