Yangzhou Kaihong Power Technology Co., Ltd. (Yangzhou Headquarters)
Sales phone: 0514-87979963
Sales Straight 1: 13773587351
Sales line 2: 18932373905
Sales line 3: 15190420406
Company Fax: 0514-87580922
Sales email: email@example.com
Company address: Xi'an Jiaotong University Pioneer Park, East Wuzhou Road, Yangzhou
High-voltage power supply manufacturer Kaihong Technology introduces that this product technology specifically relates to an electronic gun power output circuit that is connected in series with the superimposed output after the AC voltage classification of the output voltage, classification rectification, and DC switch tube classification output.
BACKGROUND An electron gun is a device that works under vacuum and accelerates and extracts an electron cloud by accelerating high voltage. Widely used in the smelting and evaporation of refractory metals. With the melting and evaporation of metal materials by electron beams, ionizing gas or impurity dust particles will inevitably frequently be discharged and short-circuited between the high voltage electrode and the low potential, resulting in instant breakdown of high voltage to ground. . If the short-circuit overshoot is not suppressed and protected in time, the huge energy release will cause severe impact or even damage to the electron gun system and related production equipment. This puts forward specific requirements for the protection and recovery characteristics of the power supply of the electron gun. In the conventional thyristor electron gun power supply, the electron gun protection circuit quickly judges and protects the short-circuit current, and at the same time blocks the thyristor trigger pulse to achieve the purpose of closing the output. After the blocking protection is lifted, the SCR triggers pulse recovery. However, the integration time must be set, and excessive recovery will cause overshoot and overshoot. In the conventional thyristor electron gun power circuit, it is feasible to turn off the thyristor to achieve protection. However, since the thyristor is a zero-crossing shutdown device, once the thyristor is turned on within the same half-wave of the AC, it will be lost even if it is turned off. Trigger pulse, the thyristor maintains conduction before zero crossing, which will cause that after the output short circuit, after the protection circuit successfully judges and gives an action signal at the same time, the thyristor has less than half a cycle before the protective blocking is implemented ( IOmS). During this out of control time, if the design margin of the suppression current overshoot current is insufficient, it will cause severe current overshoot, cause great interference to the power grid, and have a great impact on the normal operation of surrounding electrical equipment. The overcurrent caused a trip, which caused the system to lose power. In the conventional thyristor electron gun power circuit, it is feasible to restore the DC high voltage by restoring the thyristor trigger pulse after the blocking protection is removed. However, since the integration time must be set, the time to reestablish the high voltage must be in seconds. On the order of time, this is detrimental to the continuous and stable working state of the electron gun.
Summary of the invention
In order to overcome the shortcomings of the prior art, its purpose is to provide an electron gun power output circuit. This product technology is an electron gun power output circuit, which includes the primary three-phase winding of the main loop step-up transformer and a multi-stage total output circuit composed of multiple single-stage output circuits. Each single-stage output circuit consists of a single-stage module transformer secondary winding, a single-stage module rectification filter circuit, a single-stage module DC output switch, a control protection circuit, and a single-stage module DC output circuit. The output of the secondary winding of the single-stage module transformer is in communication with the input of the single-stage module rectifier and filter circuit. The output of the single-stage module rectifier and filter circuit is in communication with the input of the single-stage module DC output switch. The output is in communication with the input of the DC output circuit of the single-stage module. The DC output switch of the single-stage module is provided with a control protection circuit. The driving signal of the DC output switch 2.3 is input by the main control circuit through port II. The DC output switch is composed of an insulated gate bipolar transistor IGBTQ1 and a triode Q1.
The DC output circuit is composed of bypass diodes D17 and D18, a voltage sharing resistor R15 and R18, and a current sharing capacitor C26 and C27.
When the electron gun power supply is over-current protected, the reaction delay from the protection circuit to the protection circuit signal to the high-voltage output cut-off is measured to be only Ιμμε, which is much smaller than the unavoidable protection of the circuit by only the thyristor cut-off. The protection of the blind zone greatly reduces the current overshoot of the electron gun during short-circuit protection, which greatly reduces the interference of the operation of the electron gun on the operation of the power grid and other equipment. The fastest recovery time of the DC high voltage after the overcurrent protection action of this product is 50mS, which is far less than the level of the unit of time per second, and through the control circuit, it can achieve multi-level (up to 36 levels) step-by-step superimposed conduction, or Realize multi-level simultaneous conduction, high-voltage recovery at the fastest speed, and the DC voltage of each stage can reach 1000Vo
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