IGBT Heating Steel Bar Making Machine Frequency Sweep Harmonic
IGBT Induction heating power supply inverter side control
- Give full play to the advantages of the parallel inverter and the
parallel harmonic oscillatio tank circuit, high power efficiency of
- Inverter main circuit parameters are of the optimization design,
rational circuit design, high reliability, power device layout is
compact, be easy in maintenance of the equipment.
- The inverter control circuit uses a high - speed intelligent
programmable devices - CPLD to achieve fixed – angle and
phase-locked control. CPLD real-time detects the converter state of
IGBT, calculate the optimal control angle point via fixed-angle and
phase-locking, and adjust the parallel resonant inverter’s
phase-locked frequency and phase output to ensure that the inverter
has been working in the best capacitive quasi-resonant state.
- Digital control circuit with CPLD is with higher integration,
better stability. Compared with the other analog phase-locked
circuit, digital control technology can solve the analog circuit’s
disadvantages like Parameter matching difficulties/Temperature
drift/Un-flexible in control. CPLD gate delay is only 5ns , it can
be accurate in fast controlling the inverter pulse. The inverter
voltage of IGBT heating power supply with Fixed-angle control can
be stabilized at a relative minimum value. The power of security is improved.
Start-oscillation type: frequency sweep
When IGBT solid-state heating power supply start to work, the
control circuit output separate-excitation pulse signals with
changing frequency from high to low to trigger inverter IGBT. When
the tank circuit signal is set up, automatically smoothly excess to
self-excited state. Sweep frequency&Phase locking control
circuit has a 100% start – up success ratio. The start process has
no attach to elements, improve the performance of the frequent
starting of the IGBT solid-state heating power supply.
- Adopt plate structure to put the control power supply and control
circuits in a plate, this greatly simplifies the external line,
reducing the point of failure, improved anti-jamming capability of
the small signal control circuitry.
- With frequency display and fault display, frequency display
accuracy can be controlled within ± 5Hz , which greatly facilitates
commissioning and maintenance.
- IGBT drive signals use advanced opto-isolation technology, the
driving signal transmission has no attenuation, greatly ensure the
consistency of the driving signal.
- IGBT driver board device has function of over current, IGBT fault
detection, pulse detection, load detection, to ensure the safety of