Great power IF power source with double parallel resonant inversion circuit

An intermediate frequency power supply, high power technology, applied in the output power conversion device, AC power input is converted into AC power output, AC power input is converted into DC power output and other directions, can solve the high voltage of inverter thyristor and resonant capacitor. , not suitable for high-power intermediate frequency furnace and other problems

Inactive Publication Date: 2004-06-23
NANKAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The inverter thyristor and resonant capacitor in this scheme must withstand too high

Method used

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  • Great power IF power source with double parallel resonant inversion circuit
  • Great power IF power source with double parallel resonant inversion circuit
  • Great power IF power source with double parallel resonant inversion circuit

Examples

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Embodiment Construction

[0018] Specific embodiments are given below in conjunction with the accompanying drawings to further illustrate how the present invention is realized.

[0019] Such as image 3 As shown, a high-power intermediate-frequency power supply using a double parallel resonant inverter circuit includes a rectifier SCR 1 ~SCR 5 Two groups of three-phase half-wave rectifiers are combined to form a thyristor full-wave rectifier bridge and smoothing reactor L d1 , L d2Two constant current sources and a double parallel resonant inverter circuit are formed, and the specific connection is through the rectification thyristor SCR 1 、SCR 3 、SCR 5 The positive half-wave pulsating DC of the input is connected to the smoothing reactance L d1 end of the L d1 The other end is connected to the resonant capacitor C 1 One end and the inverter SCR 7 anode, SCR 7 The cathode and the other inverter thyristor SCR 8 The anode is connected and becomes an output terminal A of the intermediate freque...

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PUM

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Abstract

The great power IF power source includes two, one positive and one negative, independent constant-current sources comprising triphase half-wave rectifier. In the case the parallel furnace load LC circuit is equivalent to an impedance R, each of the circuit comprising C1, SCR7, L1 and R and the circuit comprising C2, SCR8, L1 and R constitutes one parallel channel powered by the positive and the negative constant-current sources. Together with the altered conducting of SCR7 and SCR8, these two parallel channels complete the positive and the negative half-wave IF current resonance separately. The current resonance of C1L1 or C2L1 can turn off SCR7 or SCR8 naturally to avoid inversion turning and result in reliable starting of oscillation. The resonance capacitors C1 and C2 are powered separately by independent positive and negative constant-current sources without voltage accumulation and overvoltage.

Description

technical field [0001] The invention relates to an intermediate frequency power supply circuit for high-power smelting furnaces and diathermy loads, in particular to a high-power intermediate frequency power supply using double parallel resonance inverter circuits. Background technique [0002] At present, most of the thyristor intermediate frequency induction heating furnaces widely used in metal smelting and forging diathermy use parallel compensation inverter circuits. Traditional parallel compensation inverter circuits such as figure 1 As shown, it is composed of a three-phase thyristor full-wave rectifier bridge connected with a parallel compensating inverter through a smoothing reactor; the conducting thyristor 1 and thyristor 2 cannot be turned off by themselves, only by triggering another The thyristor 3 and thyristor 4 of a bridge arm can be forced to turn off by using the residual voltage on the capacitor C to reversely discharge the thyristor 1 and thyristor 2; S...

Claims

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Application Information

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IPC IPC(8): H02M5/45H02M7/521
Inventor 罗马苏玉民黄旭东高成群
Owner NANKAI UNIV
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