3 Phase AC Variable Power Supply Static Frequency Converter
1.1 General descriptions
HZDBP Series intelligent variable-frequency power supply is the new-generation variable-frequency and stable-frequency power supply equipment developed by our Company. It satisfies the special requirements on the use of imported equipment in China as it can simulate the power supply environment of different countries in the world. It can also provide power supply for test of exported domestic equipment.
1.2 Design philosophy
The primary circuit of HZDBP Series variable-frequency power supply is designed according to the working principle of AC-DC-AC and mainly comprises rectifier, DC filter capacitor bank, inverter, output resistor, isolation transformer and AC filter capacitor bank
1st-stage AC-DC rectifier part: the input AC voltage is buffered by the current-limiting resistance and converted into DC voltage via the full-bridge rectifier module.
2nd-stage DC-AC inverter part: heavy-duty IGBT (insulated gate bipolar transistor) is adopted as the inversion element. Advanced sine-wave pulse-width modulation (SPWM) technology is adopted to compare the modulation wave (base sine-wave power supply) and carrier wave (base triangular wave power supply). When the carrier wave and the modulation wave cross each other, the switching time of the inverter switch tube IGBT and its on/off status are determined via the crossing point to acquire a series of positive and negative rectangular SPWM with different widths. This series of pulses is characterized by equal breadth and unequal width. Its width changes in a sine wave. In half cycle of sine wave, the total area of positive and negative pulses is the same as the area of sine wave. The output pulse width modulation wave is filtered via the LC filter circuit to obtain pure sine wave AC voltage. The output is furnished with an isolation transformer to increase the general stability of the equipment.
1.3 Product features
★High impact resistance: Imported IGBT power module
★High accuracy of stable frequency: Spatial vector pulse width modulation, frequency stability <>
★High accuracy of stable voltage: PID algorithm control, voltage stability <>
★Fast response: AD synchronous sampling, response speed <>
★Good output waveform: SPWM sine-wave pulse-width modulation, output sine wave THD<>
★Wide voltage range: Step-up voltage output in an isolated manner
★Good interference immunity: Complete I/O isolation
Parameters
Input | Rated voltage | AC380V/400V |
Range of fluctuation | Rated voltage±15% | |
Frequency | 40-70Hz | |
Output | Modulation mode | IGBT/SPWM |
Voltage | 3Φ4W+PE, AC0-520V | |
Voltage stability | ≤1.0% | |
Total harmonic distortion (THD) | ≤3.0% (linear load) | |
Frequency | 43-73Hz phaseless regulation; 50/60Hz phased regulation | |
Frequency stability | ≤0.1% | |
Response time | 2ms for input voltage fluctuation | |
Display diagnostic system | Electric parameter display | Input voltage and frequency; output phase voltage, mean line voltage, current, frequency, apparent power, active power, reactive power and power factor |
Electric parameter display resolution | Voltage resolution 0.1V, current resolution 0.1A | |
Fault diagnosis and display | Overload fault, IGBT module fault, fuse fault, over-temperature fault | |
Display media | Touch screen | |
Alarm function | Overload alarm, IGBT alarm, fuse alarm, temperature alarm (85℃±5℃) | |
Note: the foregoing technical parameters are for reference only and they shall be determined otherwise according to the technical requirements of order for non-standard products.
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