Quick current-limiting protection circuit of negative electrode modulator
A cathode modulation and current-limiting protection technology, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices with automatic disconnection, etc., can solve problems such as easy damage, and achieve fast current-limiting response speed, simple circuit, and reliability high effect
Active Publication Date: 2018-03-30
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide a fast current-limiting protection circuit for the cathode modulator to overcome the fault that the existing cathode modulator is easily damaged when the klystron is ignited. It has simple circuit, fast current-limiting response speed, The advantages of stable and reliable work
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[0025] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.
[0026] Such as figure 1 As shown, a cathode modulator fast current limiting protection circuit includes a current sampling circuit and a gate voltage clamping circuit. Terminal 1 of the current sampling circuit is connected to the input terminal of the modulator and terminal 2 of the gate voltage clamping circuit, terminal 2 of the current sampling circuit is connected to the negative terminal of the cathode high-voltage power supply, and terminal 3 of the grid voltage clamping circuit, and the gate voltage Terminal 1 of the clamping circuit is connected to the gate of the switch tube inside the modulator.
[002...
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The invention discloses a quick current-limiting protection circuit of a negative electrode modulator. The quick current-limiting protection circuit comprises a current sampling circuit and a gate voltage clamping circuit; the 1 end of the current sampling circuit is connected with the input end of the modulator and the 2 end of the gate voltage clamping circuit; the 2 end of the current samplingcircuit is connected with the negative end of a negative electrode high-voltage power supply and the 3 end of the gate voltage clamping circuit; and the 1 end of the gate voltage clamping circuit is connected with a gate of an internal switching tube of the modulator. Compared with the prior art, the quick current-limiting protection circuit has the following advantages: by virtue of the current-limiting protection circuit, the gate voltage of the internal switching tube of the negative electrode modulator is controlled, so that quick and effective current-limiting protection on the modulatorcan be performed; and a simple circuit, high current-limiting response speed and high reliability are achieved, so that it is ensured that the negative electrode modulator can perform current limitingwithout being damaged when the modulator suffers from sparking and overcurrent.
Description
technical field [0001] The invention relates to the technical field of radar transmitters, in particular to a cathode current overcurrent protection method for a cathode modulation klystron. Background technique [0002] Klystron is widely used in radar, electronic countermeasures and other fields, and is a commonly used power amplifier device. Generally speaking, a klystron has multiple electrodes, such as filament, cathode, collector and anode, etc. When a suitable power supply voltage is applied to each electrode of the klystron, the input microwave signal is effectively amplified. [0003] The vast majority of klystron radar transmitters work in pulse mode, so it is necessary to modulate and output the power supply of a certain electrode of the klystron through a pulse modulator. Commonly used are grid modulation, anode modulation, focus electrode modulation, control Electrode modulation, cathode modulation, etc. Among them, cathode modulation, only during the duration...
Claims
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IPC IPC(8): H02H3/087
CPCH02H3/087
Inventor 李可王一农汪平
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST