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Thyristor jumper trigger circuit with negative resistance characteristics

A technology of trigger circuit and thyristor, which is applied in the electronic field, can solve problems such as the influence of action correctness and poor anti-interference, and achieve the effect of reliable operation and good repeatability of threshold contact

Inactive Publication Date: 2010-06-02
GUANGZHOU KINTE ELECTRIC APPLIANCE CONTROL INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some trigger circuits of this type also use low-current thyristors internally, but their anti-interference is poor, and the correctness of action is also affected by the trigger parameters of low-current thyristors.

Method used

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  • Thyristor jumper trigger circuit with negative resistance characteristics
  • Thyristor jumper trigger circuit with negative resistance characteristics
  • Thyristor jumper trigger circuit with negative resistance characteristics

Examples

Experimental program
Comparison scheme
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Embodiment

[0009] Example: U AO is the monitored overvoltage. Put resistor R 1 , R 2 Connect to AO after connecting in series. The detection voltage is sent from the contact B of the two resistors and the reference zero level O point, which is the first loop. The input end of the second loop is the regulator tube V connected to point B 1 of the cathode. Put the voltage regulator V 1 with opto-isolator V 2 The common anode of the light-emitting tubes is connected in series, and the photoisolator V 2 The output is connected in parallel with V 1 Upper (transistor collector connected to V 1 Cathode, emitter connected to V 1 anode), the opto-isolator V 2 Light-emitting tube and guiding diode D 3 Forward in series, the cathode of the third diode D3 is connected to the control pole G of the thyristor SCR; then the series diode D used to clamp the current limit 1 、D 2 and leakage resistance R 4 while paralleling the opto-isolator V 2 On the luminous tube, the anti-interference re...

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Abstract

A thyristor jumper trigger is composed of voltage detecting return circuit and current drive return circuit. Said voltage detecting return circuit consists of R1 and R2 to form a resister-type voltagedivider and the voltage (Ubo) across the R2 is used as test voltage. Said current drive relurn circuit has a key feedback circuit consisting of voltage-stabilizing tube and photoelectric isolator. When Ubo is higher than the stabilized voltage value, it can drive current (I3) to quickly increase. The Ubo-I3 shows negative resistance characteristics. Its advantages include high repeatability of threshold and reliability.

Description

technical field [0001] The invention relates to a thyristor jumper trigger circuit with negative resistance characteristics, which belongs to the field of electronic technology. Background technique [0002] Thyristor jumpers are widely used in rotor overvoltage protection of synchronous generators and synchronous motors. The jumper consists of a thyristor and a power dissipating device. When the amplitude of the rotor overvoltage is greater than the set threshold, the jumper triggers the circuit to turn on the thyristor, and incorporates the energy-consuming device into the rotor circuit, thereby achieving the purpose of limiting the amplitude of the overvoltage. For this kind of trigger circuit, it is required that the wiring is simple, the work is reliable, the threshold touch-on repeatability is good, and the action value is not affected by the trigger parameters of the thyristor as much as possible. Existing jumper trigger circuits often use figure 1 The simple trigg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/04
Inventor 竺厥衫
Owner GUANGZHOU KINTE ELECTRIC APPLIANCE CONTROL INDAL