CN210225272U - Direct current power supply for filament of vacuum electronic device - Google Patents
Direct current power supply for filament of vacuum electronic device Download PDFInfo
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- CN210225272U CN210225272U CN201921368987.7U CN201921368987U CN210225272U CN 210225272 U CN210225272 U CN 210225272U CN 201921368987 U CN201921368987 U CN 201921368987U CN 210225272 U CN210225272 U CN 210225272U
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Abstract
The utility model discloses a DC power supply for vacuum electron device filament, including electrical connection's input rectification filter circuit, LLC resonant circuit, output rectification filter circuit and BUCK converting circuit in proper order. The BUCK conversion circuit is used for adjusting the output gain, the defect that the gain adjustment range of the LLC resonant converter is narrow is overcome, the power supply can work in a working state that the switching frequency is fixed or only the switching frequency is adjusted in a small range, the advantage of the LLC resonant circuit is exerted, meanwhile, the wider output gain adjustment can be met, the high-frequency switching power supply enables the power supply waveform of a magnetron filament to be smooth and stable, and the magnetron microwave output is enabled to be stable. The BUCK conversion circuit regulates voltage on the secondary side of a transformer (the LLC resonant circuit contains the transformer), and the voltage resistance of selected devices of the circuit is lower.
Description
Technical Field
The utility model relates to a switching power supply technical field, in particular to a DC power supply for vacuum electron device filament.
Background
Vacuum electronic devices are devices that convert one form of electromagnetic energy into another form of electromagnetic energy. It has vacuum sealed tube shell and several electrodes, and the tube is vacuumed. Some vacuum electronic devices require recharging with a gas of a desired composition and pressure after the gas is evacuated from the tube. Vacuum electronic devices are widely used in the fields of broadcasting, communication, television, radar, navigation, automatic control, electronic countermeasure, computer terminal display, medical diagnosis and treatment, heating, drying, sterilization, vulcanization, thawing, microwave plasma devices, sewage treatment, asphalt pavement maintenance, medical waste treatment and the like.
The power supply of the vacuum electronic device is core corollary equipment for converting the power supply into other electromagnetic energy, most of the vacuum electronic devices are provided with filaments for generating electrons, and the filament power supply is required to be configured to generate the electrons. Most of the traditional filament power supplies are supplied with alternating current or direct current with large pulsation, the electronic variation generated by the filament changes along with the variation trend of power supply fluctuation, the output stability of other electromagnetic energy converted by a vacuum electronic device is influenced, and the stability or precision and other indexes of other subsequent equipment are further influenced.
In summary, there is a need for a technical solution to solve the problem that the output waveform of the conventional filament power supply of the vacuum electronic device is not stable enough, so as to facilitate the improvement of the production process of the subsequent equipment or the technical indexes such as the output accuracy, and to meet the various high index requirements of the market.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the problem that the output of the existing filament power supply is not stable enough, a direct current power supply for a filament of a vacuum electronic device is provided.
In order to realize the purpose, the utility model discloses a technical scheme be:
a direct current power supply for a filament of a vacuum electronic device comprises an input rectification filter circuit, an LLC resonance circuit, an output rectification filter circuit and a BUCK conversion circuit which are electrically connected in sequence.
Preferably, an EMI filter circuit is further disposed on an input side of the input rectifying and filtering circuit, and the EMI filter circuit includes a filter inductor and a filter capacitor.
Preferably, the input rectifying and filtering circuit comprises an input bridge rectifying circuit or a PFC circuit, and a first filtering circuit.
Preferably, the output rectifying and filtering circuit comprises a full-bridge rectifying circuit or a center-tap rectifying circuit, and a second filtering circuit.
Preferably, a first monitoring unit and a second monitoring unit are further arranged; the first monitoring unit is electrically connected with the input rectifying and filtering circuit and/or the LLC resonant circuit and is used for providing control signals required by each circuit and/or monitoring the working state and/or the operating parameters of each circuit; the second monitoring unit is electrically connected with the output rectifying and filtering circuit and/or the BUCK conversion circuit and is used for providing control signals required by each circuit and/or monitoring the working state and/or the operating parameters of each circuit.
Preferably, the first monitoring unit and the second monitoring unit are connected through an optical fiber.
Preferably, the second monitoring unit further comprises a filament current detection module, and signal sampling of the filament current detection module is derived from a current sensor on the output side.
Preferably, the input rectifying and filtering circuit comprises a controllable semiconductor switch device and/or a non-controllable semiconductor switch device; the output rectifying and filtering circuit comprises a controllable semiconductor switch device or an uncontrollable semiconductor switch device; the BUCK conversion circuit and the LLC resonant circuit both comprise controllable semiconductor switching devices.
And the driving signals output by the first monitoring unit and the second monitoring unit carry out switching control on the controllable semiconductor switching device.
Preferably, the controllable semiconductor switch device is an insulated gate bipolar transistor and/or a metal-oxide semiconductor field effect transistor and/or a thyristor; the non-controllable semiconductor switching device is a diode.
Preferably, the BUCK conversion circuit comprises a controllable semiconductor switching device, a diode, an inductor and a filter capacitor which are connected in sequence.
In conclusion, because the technical scheme is adopted, the utility model discloses a DC power supply's for vacuum electron device filament beneficial effect is:
the utility model discloses a DC power supply for vacuum electron device filament, including electric connection's input rectification filter circuit, LLC resonant circuit, output rectification filter circuit and BUCK converting circuit in proper order, reach first monitoring unit, second monitoring unit. The BUCK conversion circuit is used for adjusting the output gain, the defect that the gain adjustment range of the LLC resonant converter is narrow is overcome, the power supply can work in a working state that the switching frequency is fixed or only the switching frequency is adjusted in a small range, the advantage of the LLC resonant circuit is exerted, meanwhile, the wider output gain adjustment can be met, the high-frequency switching power supply enables the power supply waveform of a magnetron filament to be smooth and stable, and the magnetron microwave output is enabled to be stable. The BUCK conversion circuit regulates voltage on the secondary side of a transformer (an LLC resonant circuit contains the transformer), the voltage resistance of a device selected by the circuit is low (from a few volts to dozens of volts because the filament voltage is generally not high), the current of the BUCK conversion circuit is large, and the cost performance of the low-voltage device is high. The primary/secondary side isolation voltage of the transformer is high voltage of thousands of volts to dozens of kilovolts, the first monitoring unit monitors a circuit on the primary side of the transformer, the second monitoring unit monitors a circuit on the secondary side of the transformer, and high-voltage and low-voltage separation control is safe and reliable. The filament current and voltage detection elements are more common, the circuit is simple, the filament current and voltage detection elements are directly electrically connected with the second monitoring unit, and the cost of the current and voltage detection part is very low.
Drawings
Fig. 1 is a schematic diagram of a topological connection of a main circuit of a conventional filament power supply.
Fig. 2 is a schematic diagram of a topological connection of another conventional filament power supply main loop.
Fig. 3 is a schematic diagram of the topology connection of the main circuit of the filament power supply of the present invention.
Fig. 4 is a schematic diagram of a filament power supply connection including a first monitoring unit and a second monitoring unit.
Fig. 5 is a schematic diagram of a PFC rectifier circuit in embodiment 1.
Fig. 6 is a schematic diagram of a BUCK conversion circuit in embodiment 1.
Fig. 7 is a schematic diagram of an LLC resonant circuit in embodiment 1.
Fig. 8 is a schematic diagram of a filament power connection with EMI circuitry.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Referring to fig. 3, a dc power supply for a filament of a vacuum electronic device includes an input rectifying filter circuit, an LLC resonant circuit, an output rectifying filter circuit, and a BUCK conversion circuit electrically connected in sequence; the input side of the input rectifying and filtering circuit is connected with an input power supply; the input side of the LLC resonant circuit is connected with the output side of the input rectifying and filtering circuit; the output side of the LLC resonant circuit is connected with the input side of the output rectifying and filtering circuit; the input side of the BUCK conversion circuit is connected with the output side of the output rectifying filter circuit, and the output side of the BUCK conversion circuit provides a stable direct-current working power supply for a magnetron filament.
As shown in fig. 4, a first monitoring unit and a second monitoring unit are also provided; the first monitoring unit is electrically connected with the input rectifying and filtering circuit and/or the LLC resonant circuit and is used for providing control signals required by each circuit and/or monitoring the working state and/or the operating parameters of each circuit; the second monitoring unit is electrically connected with the output rectifying and filtering circuit and/or the BUCK conversion circuit and is used for providing control signals required by each circuit and/or monitoring the working state and/or the operating parameters of each circuit. The first monitoring unit is connected with the second monitoring unit through an optical fiber. The second monitoring unit further comprises a filament current detection module, the signal sampling of which is derived from a current sensor on the output side.
The input rectifying and filtering circuit is a PFC circuit or a combination of a bridge rectifying circuit and a filtering circuit; the PFC circuit comprises a controllable semiconductor switch device, the controllable semiconductor switch device comprises controllable devices such as an insulated gate bipolar transistor IGBT, a metal-oxide semiconductor field effect transistor MOSFET and a thyristor, and the controllable devices are controlled to be switched on/off by a driving signal from the first monitoring unit. The power factor of the power grid side is high, the harmonic wave is small, the output direct current is more stable and smooth, the output voltage can be set to be more matched with the LLC resonant circuit, so that the switching loss of the LLC resonant circuit is reduced, a semiconductor device with smaller current is selected as a switching device of the LLC resonant circuit, and the power supply is suitable for being selected and used as a high-performance power supply; the bridge rectifier circuit is simple, low in cost and suitable for high cost performance power supply.
The LLC resonant circuit consists of a controllable semiconductor switching device, an inductor, a capacitor and a high-frequency transformer. The controllable semiconductor switch device comprises controllable devices such as an insulated gate bipolar transistor IGBT, a metal-oxide semiconductor field effect transistor MOSFET and a thyristor, and is controlled to be switched on/off by a driving signal from the first monitoring unit. LLC resonant circuit: the conversion efficiency is high, the loss of the switching device is small, the heat generation is small, the switching frequency can be improved, the volume of the magnetic part is reduced, and the cost is reduced. The LLC resonant circuit is used in combination with the BUCK conversion circuit, so that the defect that the gain adjustment range of the LLC resonant circuit is narrow is overcome, the LLC resonant circuit can work in a working state that the switching frequency is fixed or only the switching frequency is adjusted in a small range, the working state enables the LLC resonant circuit to work at an optimal working point of efficiency, and the advantages of the LLC resonant circuit are fully exerted.
The output rectifying and filtering circuit is a combination of a full-bridge rectifying circuit or a center-tap rectifying circuit and a filtering circuit. The rectifying circuit is composed of a semiconductor rectifying device, the semiconductor rectifying device can be an uncontrollable device (such as a diode) or a controllable device (such as an IGBT, a MOSFET, a thyristor and the like), and when the controllable rectifying circuit is formed by the controllable device, a switch device driving signal needs to be provided for the controllable rectifying device through the second monitoring unit. The filter circuit is composed of a capacitor and/or an inductor and can be one of an LC or CLC or LCL filter circuit. The full-bridge rectifier circuit is simple in design of a high-frequency transformer, and is adapted to a power supply with higher output voltage; the center tap rectifying circuit has the advantages of small quantity of semiconductor switching devices, low loss and adaptation to a power supply with low output voltage.
The BUCK conversion circuit comprises a controllable semiconductor switching device, a diode, an inductor and a filter capacitor which are sequentially connected, and the effect of adjusting the output voltage is achieved by adjusting the on-off duty ratio of the controllable semiconductor switching device. The controllable semiconductor switch device comprises controllable devices such as an insulated gate bipolar transistor IGBT, a metal-oxide semiconductor field effect transistor MOSFET and a thyristor, and is controlled to be switched on/off by a driving signal from the second monitoring unit. BUCK voltage reduction circuit: the circuit is simple, the devices are few, the voltage reduction control conversion efficiency is high, and the gain adjustment range is wide.
Example 1
A direct current power supply for a filament of a vacuum electronic device comprises an input rectification filter circuit, an LLC resonance circuit, an output rectification filter circuit, a BUCK conversion circuit, a first monitoring unit and a second monitoring unit which are electrically connected in sequence; the first monitoring unit provides a driving signal for the LLC resonant circuit and detects LLC resonant cavity current, and the second monitoring unit provides a driving signal for the BUCK conversion circuit and detects the voltage and the current output by the BUCK conversion circuit, so that closed-loop control with comprehensive protection is formed.
As shown in fig. 5, the input rectifying and filtering circuit is a combination of a PFC rectifying circuit and a filtering circuit; the controllable semiconductor switch device in the PFC rectifying circuit selects an Insulated Gate Bipolar Transistor (IGBT) or a metal-oxide semiconductor field effect transistor (MOSFET), and is switched on/off controlled by a driving signal from the first monitoring unit, so that the power factor of the power supply is high and the harmonic wave is small; the output voltage is set to be more matched with the withstand voltage of the LLC resonant circuit, so that the switching loss of the LLC resonant circuit is reduced, and a controllable semiconductor device with smaller current is selected as a switching device of the LLC resonant circuit, so that the power supply cost is reduced.
As shown in fig. 7, the LLC resonant circuit is composed of a controllable semiconductor switching device, an inductor, a capacitor, and a high-frequency transformer, and a part of resonant parameters in the circuit directly utilizes parasitic parameters of the high-frequency transformer, which is beneficial to reducing the use of devices, thereby reducing the cost and reducing the volume of the power supply. The controllable semiconductor switch device is an Insulated Gate Bipolar Transistor (IGBT) or a metal-oxide semiconductor field effect transistor (MOSFET) and is controlled to be switched on/off by a driving signal from the first monitoring unit. The circuit has high conversion efficiency, small loss and small heat generation of the switching device, can improve the switching frequency and reduce the volume and the cost of the magnetic part. The circuit is combined with the BUCK conversion circuit for use, so that the defect that the gain adjustment range of the LLC resonant circuit is narrow is overcome, the LLC resonant circuit can work in a working state that the switching frequency is fixed or only the switching frequency is adjusted in a small range, the working state enables the LLC resonant circuit to work at an optimal working point of efficiency, and the advantages of the LLC resonant circuit are fully exerted.
The output rectifying and filtering circuit is a combination of a full-bridge rectifying circuit and a filtering circuit. The rectifier circuit is composed of diodes of integer multiple of four, and the filter circuit is composed of capacitors, so that the circuit is relatively simple, and the high-frequency transformer can be designed to be relatively simple.
As shown in fig. 6, the BUCK conversion circuit includes a controllable semiconductor switching device, a diode, an inductor and a filter capacitor, which are connected in sequence, and has a simple circuit and few devices. The effect of adjusting the output voltage is achieved by adjusting the on-off duty ratio of the insulated gate bipolar transistor IGBT or the metal-oxide semiconductor field effect transistor MOSFET, the voltage reduction control conversion efficiency is high, and the gain adjustment range is wide.
The control signal transmission of the first monitoring unit and the second monitoring unit can be realized through optical fibers. The second monitoring unit also comprises a filament current detection module, wherein signal sampling of the filament current detection module is from a Hall sensor for detecting the current of the output side, and closed-loop control is formed through the signal, so that the output current can be always kept constant according to a given numerical value, and the purpose of regulating and controlling the output current is achieved.
Example 2
Referring to fig. 8, the dc power supply for the filament of the vacuum electronic device is further provided with an EMI filter circuit on the input side of the input rectifying filter circuit, and the EMI filter circuit is formed by combining a filter inductor and a filter capacitor. The EMI filter circuit is arranged to inhibit and/or bypass high-frequency interference signals of the power grid and the power supply and/or block mutual crosstalk of the high-frequency interference signals of the power grid and the power supply, so that the interference signals of the power grid are prevented from influencing normal work of the power supply, the interference signals of the power supply are prevented from influencing normal work of other equipment in the power grid, and the application reliability and safety of electric equipment in a power grid system are improved.
The above embodiments are only used to illustrate the present invention and not to limit the technical solutions of the present invention, and although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above embodiments, therefore, any modifications or equivalent replacements of the present invention can be made, and all technical solutions and modifications without departing from the spirit and scope of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A direct current power supply for a filament of a vacuum electronic device is characterized by comprising an input rectification filter circuit, an LLC resonant circuit, an output rectification filter circuit and a BUCK conversion circuit which are electrically connected in sequence, and a first monitoring unit and a second monitoring unit are further arranged; the first monitoring unit is electrically connected with the input rectifying and filtering circuit and/or the LLC resonant circuit and is used for providing control signals required by each circuit and/or monitoring the working state and/or the operating parameters of each circuit; the second monitoring unit is electrically connected with the output rectifying and filtering circuit and/or the BUCK conversion circuit and is used for providing control signals required by each circuit and/or monitoring the working state and/or the operating parameters of each circuit.
2. The dc power supply for a filament of a vacuum electronic device as set forth in claim 1, wherein an EMI filter circuit is further provided on an input side of said input rectifying filter circuit, said EMI filter circuit including a filter inductance and a filter capacitance.
3. The dc power supply for a vacuum electronics filament of claim 1, wherein said input rectifying filter circuit comprises an input bridge rectifier circuit or PFC circuit, and a first filter circuit.
4. The dc power supply for a vacuum electronics filament of claim 1, wherein said output rectifying filter circuit comprises a full bridge or center tap rectifying circuit, and a second filter circuit.
5. The dc power supply for a vacuum electronics filament of claim 1, wherein the first monitoring unit and the second monitoring unit are connected by an optical fiber.
6. The dc power supply for a vacuum electronics filament of claim 1, wherein the second monitoring unit further comprises a filament current detection module whose signal samples are derived from a current sensor on the output side.
7. The dc power supply for a vacuum electronic filament according to claim 1, wherein said input rectifying filter circuit comprises controllable semiconductor switching devices and/or non-controllable semiconductor switching devices; the output rectifying and filtering circuit comprises a controllable semiconductor switch device or an uncontrollable semiconductor switch device; the BUCK conversion circuit and the LLC resonant circuit both comprise controllable semiconductor switching devices;
and the driving signals output by the first monitoring unit and the second monitoring unit carry out switching control on the controllable semiconductor switching device.
8. The dc power supply for vacuum electronic device filaments as claimed in claim 7, wherein the controllable semiconductor switching devices are insulated gate bipolar transistors and/or metal-oxide semiconductor field effect transistors and/or thyristors; the non-controllable semiconductor switching device is a diode.
9. The vacuum electronics filament dc power supply of claim 1, wherein the BUCK conversion circuit comprises a controllable semiconductor switching device, a diode, an inductor, and a filter capacitor connected in series.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921368987.7U CN210225272U (en) | 2019-08-21 | 2019-08-21 | Direct current power supply for filament of vacuum electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921368987.7U CN210225272U (en) | 2019-08-21 | 2019-08-21 | Direct current power supply for filament of vacuum electronic device |
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| CN210225272U true CN210225272U (en) | 2020-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111464035A (en) * | 2020-04-28 | 2020-07-28 | 青岛市中心医院 | Non-contact voltage regulating circuit and voltage regulating method of high-voltage isolation type medical power supply |
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2019
- 2019-08-21 CN CN201921368987.7U patent/CN210225272U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111464035A (en) * | 2020-04-28 | 2020-07-28 | 青岛市中心医院 | Non-contact voltage regulating circuit and voltage regulating method of high-voltage isolation type medical power supply |
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Address after: 618000, No.19 Tumenjiang Road, Deyang City, Sichuan Province Patentee after: Sichuan Yingjie New Energy Co.,Ltd. Address before: 618000 northeast corner of Minshan road and Tumenjiang Road, economic development zone, Deyang City, Sichuan Province Patentee before: SICHUAN WEIYU ELECTRIC Co.,Ltd. |