A dynamic control circuit for optimizing the inverter efficiency of gyrotron traveling wave tube power module

Abstract

The present invention discloses a dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module, and belongs to the technical field of high-power vacuum electronic devices. The dynamic control circuit comprises an MCU single-chip computer, a frequency conversion control circuit, and a PWM control chip. The present invention introduces a frequency conversion control circuit as a frequency parameter adjustment condition of a PWM signal, and adjusts the switching frequency of the PWM signal in real time according to different output powers and cathode voltages of the power module, thereby effectively improving the overall efficiency of the power module.

Description

Technical Field

[0001] The invention belongs to the technical field of high-power vacuum electronic devices, and in particular relates to a dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module. Background Art

[0002] As a high-power vacuum electronic device working in the millimeter wave frequency band, the gyrotron traveling wave tube usually has a series of characteristics such as high power, wide bandwidth, and high gain. It has been widely used in radar, millimeter wave communication, electronic countermeasures and other fields.

[0003] When the gyrotron traveling wave tube is used, in order to improve the efficiency of the power module and reduce the power consumption of the power module, the efficiency of the power module needs to be optimized in real time. The traditional method is to use the PWM control chip to output a PWM signal with a fixed switching frequency to stabilize the output voltage of the power module. However, in a high-power working environment, the resonant circuit parameters will change with the increase of power, resulting in a change in the optimal operating frequency. At this time, if the switching frequency is not adjusted in time, the overall efficiency of the power module will be reduced, and the heat will also be aggravated. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module, comprising an MCU single chip computer, a frequency conversion control circuit, and a PWM control chip;

[0007] The MCU single chip is used to collect the cathode voltage and cathode current output by the power module, obtain the average voltage and average current, and calculate the average output power based on the average voltage and average current, and finally send the average output power to the host computer for real-time display and storage; at the same time, the MCU single chip is also used to output the reference cathode voltage to the PWM control chip;

[0008] The variable frequency control circuit includes a multiplier and a triode; wherein the multiplier is used to receive the instantaneous cathode voltage and instantaneous cathode current of the power module, and calculate the control signal based on the instantaneous cathode voltage and instantaneous cathode current; the triode is used to receive the control signal, obtain the variable frequency control signal according to the control signal and send it to the PWM control chip;

[0009] The PWM control chip is used to receive a reference cathode voltage and a variable frequency control signal, and adjust the duty cycle and frequency of the PWM signal in real time according to the reference cathode voltage and the variable frequency control signal to obtain a variable frequency PWM signal; the variable frequency PWM signal is sent to the power module to control the switching frequency of the output voltage of the power module, thereby improving the overall working efficiency of the power module.

[0010] Preferably, in the PWM control chip, the frequency conversion control signal is used to adjust the frequency of the PWM signal; and the reference cathode voltage is used to control the duty cycle of the PWM signal.

[0011] Preferably, the multiplier is used to multiply the instantaneous cathode voltage and the instantaneous cathode current to obtain the instantaneous output power, and then add the instantaneous output power to the instantaneous cathode voltage to obtain the control signal.

[0012] Preferably, the base of the transistor is connected to the output end of the multiplier, the collector is connected to the PWM control chip, and the emitter is grounded; when the voltage of the control signal changes, the emitter current and collector current of the transistor change accordingly, and the collector outputs a variable frequency control signal.

[0013] Preferably, the instantaneous cathode voltage and the instantaneous cathode current are both input into the multiplier after the voltage and current values ​​are reduced by a voltage divider circuit.

[0014] Preferably, the control signal output by the multiplier passes through a voltage divider circuit and a current limiting resistor connected in series and then connected to the base of the transistor switch.

[0015] Preferably, the model of the multiplier is AD633JRZ.

[0016] The beneficial effects of the present invention are as follows:

[0017] In the prior art, a fixed switching frequency is generally used to stabilize the output voltage of the power module. However, when the power increases, the optimal operating frequency will also change, resulting in a mismatch in the switching frequency, which will reduce the overall efficiency of the power module and increase the heat generation. The present invention introduces a variable frequency control circuit as a frequency parameter adjustment condition for the PWM signal, and adjusts the switching frequency of the PWM signal in real time according to the different output powers and cathode voltages of the power module, thereby effectively improving the overall efficiency of the power module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is the frequency conversion control circuit diagram in the embodiment. DETAILED DESCRIPTION

[0020] Below, in order to facilitate those skilled in the art to understand and implement the present invention, the technical solution of the present invention is further described in detail with reference to the accompanying drawings.

[0021] like Figure 1 As shown, the present embodiment provides a dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module, including an MCU single chip computer, a frequency conversion control circuit, and a PWM control chip.

[0022] The MCU single chip is used to collect the cathode voltage and cathode current output by the power module to obtain the average voltage and average current, calculate the average output power based on the average voltage and average current, and send the average output power to the host computer for real-time display and storage; it is also used to detect whether the collected average voltage and average current exceed the preset threshold value, and if so, send an alarm signal to the PWM control chip; at the same time, the MCU single chip is also used to output a reference cathode voltage to the PWM control chip.

[0023] The frequency conversion control circuit is as follows: Figure 2 As shown, it includes a multiplier, a triode, a voltage-dividing resistor and four voltage-dividing circuits; wherein the model of the multiplier is AD633JRZ, two instantaneous cathode voltages are respectively divided by a voltage-dividing circuit and then input into the multiplier, and the instantaneous cathode current is also divided by a voltage-dividing circuit and then input into the multiplier; the multiplier multiplies one instantaneous cathode voltage and the instantaneous cathode current to obtain an instantaneous output power, and then adds the instantaneous output power to the instantaneous cathode voltage of another path to obtain a control signal; the control signal is transmitted to the base of the triode after being connected in series with the voltage-dividing circuit and the voltage-dividing resistor; the collector of the triode is connected to the PWM control chip, and the emitter is grounded. When the voltage of the control signal changes, that is, the voltage transmitted to the base of the triode changes, the emitter current and the collector current of the triode change accordingly, and the collector current that changes according to the change of the control signal voltage is the variable frequency control signal.

[0024] The PWM control chip is used to receive the reference cathode voltage and the variable frequency control signal, and adjust the duty cycle and frequency of the PWM signal in real time according to the reference cathode voltage and the variable frequency control signal to obtain a variable frequency PWM signal; the variable frequency PWM signal is sent to the power module to control the switching frequency of the output voltage of the power module, thereby improving the overall working efficiency of the power module. At the same time, the PWM control chip is also used to receive an alarm signal, and when the alarm signal is received, the high voltage power supply is controlled to be turned off.

[0025] The present invention introduces a variable frequency control circuit as a frequency parameter adjustment condition of a PWM signal, multiplies the instantaneous cathode voltage and the instantaneous cathode current output by the power module to obtain the instantaneous output power, adds the instantaneous output power to the instantaneous cathode voltage to obtain a control signal; then inputs the control signal to the base of the transistor, and finally obtains a variable frequency control signal that is positively correlated with the output power of the power module; finally, the frequency of the PWM signal is adjusted using the variable frequency control signal, so as to achieve the purpose of adjusting the switching frequency in real time and improving the overall working efficiency of the power module.

Claims

1. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module, characterized in that: Including MCU single chip, frequency conversion control circuit, PWM control chip; The MCU single chip is used to collect the cathode voltage and cathode current output by the power module, obtain the average voltage and average current, and calculate the average output power based on the average voltage and average current, and finally send the average output power to the host computer for real-time display and storage; at the same time, the MCU single chip is also used to output the reference cathode voltage to the PWM control chip; The variable frequency control circuit includes a multiplier and a triode; wherein the multiplier is used to receive the instantaneous cathode voltage and instantaneous cathode current of the power module, and calculate the control signal based on the instantaneous cathode voltage and instantaneous cathode current; the triode is used to receive the control signal, obtain the variable frequency control signal according to the control signal and send it to the PWM control chip; The PWM control chip is used to receive a reference cathode voltage and a variable frequency control signal, and adjust the duty cycle and frequency of the PWM signal in real time according to the reference cathode voltage and the variable frequency control signal to obtain a variable frequency PWM signal; the variable frequency PWM signal is sent to the power module to control the switching frequency of the output voltage of the power module, thereby improving the overall working efficiency of the power module.

2. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module as claimed in claim 1, characterized in that: In the PWM control chip, the variable frequency control signal is used to adjust the frequency of the PWM signal; and the reference cathode voltage is used to control the duty cycle of the PWM signal.

3. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module as claimed in claim 2, characterized in that: The multiplier is used to multiply the instantaneous cathode voltage and the instantaneous cathode current to obtain the instantaneous output power, and then add the instantaneous output power to the instantaneous cathode voltage to obtain the control signal.

4. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module as claimed in claim 3, characterized in that: The base of the transistor is connected to the output end of the multiplier, the collector is connected to the PWM control chip, and the emitter is grounded; when the voltage of the control signal changes, the emitter current and collector current of the transistor change accordingly, and the collector outputs a variable frequency control signal.

5. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module as claimed in claim 4, characterized in that: The instantaneous cathode voltage and the instantaneous cathode current are both input into the multiplier after the voltage and current values ​​are reduced by the voltage divider circuit.

6. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module as claimed in claim 4 or 5, characterized in that: The control signal output by the multiplier passes through a voltage divider circuit and a current limiting resistor connected in series and then is connected to the base of the transistor switch.

7. A dynamic control circuit for optimizing the inverter efficiency of a gyrotron traveling wave tube power module as claimed in claim 6, characterized in that: The model of the multiplier is AD633JRZ.

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