Semiconductor and Technology Used in Our Machine
1. Power Semiconductor Devices Used in Our Products
●MOSFET
Characteristics: operating at high frequency, low switching losses and easy to drive
●IGBT(Insulated Gate Bipolar Transistor)
Characteristics: much lower conduction loss at high current lever compare with MOSFET, excellent ruggedness, low switching losses and tolerance of overloads.
●SCR (Silicon Controlled Rectifier)
Characteristics: It is a type of thyristor and semi controlled device.
●Rectifier
Characteristics: reliable quality with tolerance of overloads
2. LC Series Resonance Technology
Usually two types of circuits are used in Induction Heating machine:
Current Feedback -type LC parallel resonance:
Voltage Feedback- type LC series resonance
LC parallel resonance:
I OSC=QIDC VOSC=VDC
VOSC: Voltage at coil VDC: DC voltage after rectifying
I OSC: Current at coil IDC: DC current after rectifying
●Current feedback, high consumption duo to high Iosc
●Not switch on quickly at any load & temperature because voltage waveform is square wave.
LC Series Resonant Circuit
VOSC=QVDC I OSC=IDC
VOSC: Voltage at coil VDC: DC voltage after rectifying
I OSC: Current at coil IDC: DC current after rectifying
●Voltage feedback, low consumption duo to low I OSC
●Switch on quickly at any load & temperature, because Load current waveform is sine wave
All of our products use LC Series Resonance technology so that our machine can save energy up to 30%.
3. Diode Rectification Technology
Normally there are two types of Rectification: Diode Rectification and SCR Rectification.
SCR Rectification:
Output power adjust at rectification circuit
Chopped mode rectifying through SCR (Silicon Controlled Rectifier) cause:
●Bad power factor
●More effect to power grid.
●More ultra harmonic
Customers need add capacitance cabinet for power factor compensation
Diode Rectification
Output power adjust at oscillation circuit
Direct rectify through Diode without chopped mode rectifying, the advantage as follow:
●Good power factor
●Less effect to power grid
●Less ultra harmonic.
Customers no need add capacitance cabinet for power factor compensation and save cost.
Our products use Diode Rectification Technology so the power factor is never less 0.95
4. Phase-locked Loop Technology
Machine automatically tracks the frequency change at oscillation circuit, so that the frequency at oscillation circuit will always be conformable with switching frequency of IGBT. This Phase-locked technology used in our product that ensures oscillation circuit always staying resonance status. Hence the machine efficiency is always over 90%.
5. Soft-switching technology (PS-ZVZCS-PWM)
The reliability of power devices depend on consumption of themselves. Lower energy consumption on power devices ensures reliability of equipment at same time ensure power devices working on higher frequency. We have solved this problem through Soft-switching technology. Under this technology, Power device turn on at zero voltage and turn off at zero current.
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Post time: Feb-04-2021
