CN210490742U - Direct current power supply of vacuum electronic device filament - Google Patents
Direct current power supply of vacuum electronic device filament Download PDFInfo
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- CN210490742U CN210490742U CN201921366750.5U CN201921366750U CN210490742U CN 210490742 U CN210490742 U CN 210490742U CN 201921366750 U CN201921366750 U CN 201921366750U CN 210490742 U CN210490742 U CN 210490742U
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Abstract
The utility model discloses a DC power supply of vacuum electron device filament, including electrical connection's input rectification filter circuit, BUCK converting circuit, LLC resonant circuit and output rectification filter 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 primary side of a transformer (the LLC resonant circuit contains the transformer), and has the advantages of low current, low heat generation and high efficiency.
Description
Technical Field
The utility model relates to a switching power supply technical field, in particular to direct current power supply of 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: the direct current power supply of the vacuum electronic device filament is provided for solving the problem that the output of the existing filament power supply is not stable enough.
In order to realize the purpose, the utility model discloses a technical scheme be:
a direct current power supply of a filament of a vacuum electronic device comprises an input rectification filter circuit, a BUCK conversion circuit, an LLC resonance circuit and an output rectification filter 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; the first filter circuit comprises a capacitor and/or an inductor.
Preferably, the BUCK conversion circuit comprises a controllable semiconductor switching device, a diode, an inductor and a filter capacitor which are connected in sequence.
Preferably, the LLC resonant circuit includes an inductor, a capacitor, and a high-frequency transformer.
Preferably, the output rectifying and filtering circuit comprises a full-bridge rectifying circuit or a center-tap rectifying circuit, and a second filtering circuit; the second filter circuit comprises a capacitor and/or an inductor.
Preferably, a monitoring unit is further provided, and the monitoring unit is electrically connected to the input rectifying and filtering circuit and/or the BUCK conversion circuit and/or the LLC resonant circuit and/or the output rectifying and filtering circuit, and is configured to provide a control signal required by each circuit and/or monitor an operating state and/or an operating parameter of each circuit.
Preferably, the monitoring unit further comprises a filament current detection module, the signal sampling of which 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 signal output by the monitoring unit carries 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.
To sum up, owing to adopted above-mentioned technical scheme, the utility model discloses a DC power supply of vacuum electron device filament's beneficial effect is:
the utility model discloses a DC power supply of vacuum electron device filament, including the control unit, and electric connection's input rectification filter circuit, BUCK converting circuit, LLC resonant circuit and output rectification filter 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 primary side of a transformer (the LLC resonant circuit contains the transformer), and has the advantages of low current, low heat generation and high efficiency. The monitoring unit is simple to control, the control is not directly in electrical connection with high voltage, safety and reliability are realized, and debugging, maintenance, repair and detection are very convenient.
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 the filament power supply connection with the monitoring unit and the main loop topology according to the present invention.
Fig. 5 is a schematic diagram of another filament power supply connection with a monitoring unit and a main loop topology according to the present invention.
Fig. 6 is a schematic diagram of a PFC rectifier circuit in embodiment 1.
Fig. 7 is a schematic diagram of a BUCK conversion circuit in embodiment 1.
Fig. 8 is a schematic diagram of an LLC resonant circuit in embodiment 1.
Fig. 9 is a schematic diagram of the connection of the filament power supply with the EMI circuit of embodiment 2.
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 comprises an input rectifying filter circuit, a BUCK converter circuit, an LLC resonant circuit, and an output rectifying filter circuit; the input side of the input rectifying and filtering circuit is connected with an input power supply; the input side of the BUCK conversion circuit is connected with the output side of the input rectifying and filtering circuit; the input side of the LLC resonant circuit is connected with the output side of the BUCK conversion circuit; the input side of the output rectifying filter circuit is connected with the output side of the LLC resonant circuit, and the output side of the output rectifying filter circuit provides a stable direct-current working power supply for a magnetron filament;
as shown in fig. 5, the monitoring unit is further included, and the monitoring unit is electrically connected with the input rectifying and filtering circuit and/or the BUCK conversion circuit and/or the LLC resonant circuit and/or the output rectifying and filtering circuit, provides control signals required by each circuit and/or monitors the working state and/or the operating parameters of each circuit.
Preferably, the input rectifying and filtering circuit is a PFC circuit or a combination of a bridge rectifier circuit and a filter circuit; the PFC circuit comprises a controllable semiconductor switch device, the controllable semiconductor switch device comprises an insulated gate bipolar transistor IGBT, a metal-oxide semiconductor field effect transistor MOSFET, a thyristor and other similar controllable devices, and the on/off control is carried out by a driving signal from a monitoring unit. The power factor of the power grid side is high, harmonic waves are small, the output direct current is more stable and smooth, the output voltage can be set to be more matched with the BUCK conversion circuit, so that the switching loss of the BUCK conversion circuit is reduced, a semiconductor device with smaller current is selected as a switching device of the BUCK conversion circuit, and the power grid conversion circuit is suitable for a high-performance power supply; the bridge rectifier circuit is simple, low in cost and suitable for high cost performance power supply.
Preferably, the BUCK conversion circuit comprises a controllable semiconductor switching device, a diode, an inductor and a filter capacitor which are connected in sequence, 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 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.
Preferably, the LLC resonant circuit is composed 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 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.
Preferably, a part of resonance parameters in the LLC resonance circuit directly utilize 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.
Preferably, the output rectifying and filtering circuit is a combination of a full-bridge rectifying circuit or a center-tapped 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 is required to be provided for the controllable rectifying device through the 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.
Preferably, the monitoring unit is made of a PCB and an electronic circuit arranged on the PCB in a combined mode, and is high in integration degree, safety and reliability. The monitoring unit further comprises a filament current detection module, as shown in fig. 4, signal sampling of the filament current detection module is from a sensor for detecting current at an 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 value, and the purpose of regulating and controlling the output current is achieved.
Preferably, the monitoring unit is further provided with a communication module for the power supply system to monitor the working condition of the filament power supply; the communication module is made by combining a wireless communication circuit and/or a wired communication circuit, and the wireless communication comprises one or more of mobile communication, WLAN, UWB, Bluetooth, infrared, NFC and other similar wireless communication modes; the wired communication comprises one or more of CAN communication, RS485 communication, RS232 communication, Ethernet communication and other similar wired communication modes. Different communication modes are suitable for application in different places, so that the intelligent charging power distribution system has wider application scenes.
Preferably, all electronic circuits of the monitoring unit are arranged on the same PCB or are made by combining a plurality of PCBs. When the PCB is a PCB, the manual workload can be reduced to the minimum, and the production efficiency and the product reliability are greatly improved; when being many PCB boards, the priority considers to use the functional module to set up the PCB board as the unit, can add or reduce relevant functional module like this according to the demand, realizes the filament power that has different functions to satisfy different customers' demand. The PCB boards are electrically connected in a board inserting mode and/or a board-to-board wiring mode, the filament power supply can be arranged more compactly in a multi-PCB mode, and the size is controlled to be the minimum.
Preferably, an EMI filter circuit is further provided on the input side of the input rectifying/smoothing circuit, and 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 utility model discloses a DC power supply of vacuum electron device filament, owing to with rectification filter circuit, BUCK converting circuit, LLC resonant circuit, output rectification filter circuit and the high frequency switching power supply that the monitoring unit connects gradually the formation, it is wide to have the gain control scope, power conversion efficiency is high, output voltage ripple, characteristics such as control accuracy height, especially BUCK converting circuit and LLC resonant circuit's combination is used, but make the power work just do the operating condition of minizone regulation at fixed switching frequency or switching frequency, full play LLC resonant circuit's advantage can satisfy the output gain regulation of broad simultaneously again, this switching power supply makes magnetron filament power supply waveform become level and smooth stable, make magnetron microwave output become steady, do benefit to the rapid development who impels high performance microwave source trade.
Example 1
A direct current power supply of a filament of a vacuum electronic device comprises an input rectification filter circuit, a BUCK conversion circuit, an LLC resonance circuit, an output rectification filter circuit and a monitoring unit which are electrically connected in sequence; the monitoring unit provides driving signals for the BUCK conversion circuit and the LLC resonant circuit, detects the voltage and current output by the BUCK conversion circuit, the LLC resonant cavity current and the output current of the output rectifying and filtering circuit, and forms closed-loop control with comprehensive protection.
As shown in fig. 6, 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 by a driving signal from the 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 BUCK conversion circuit, so that the switching loss of the BUCK conversion circuit is reduced, and a controllable semiconductor device with smaller current is selected as a switching device of the BUCK conversion circuit, so that the cost of a power supply is reduced.
As shown in fig. 7, 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.
As shown in fig. 8, 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 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.
The monitoring unit is composed of a PCB and an electronic circuit arranged on the PCB into a circuit board, and is high in integration degree, safety and reliability. The 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 aim of regulating and controlling the output current is fulfilled.
Example 2
As shown in fig. 9, a dc power supply for a filament of a vacuum electronic device has the same circuit topology as that of embodiment 1, except that: an EMI filter circuit is also arranged on the input side of the input rectifying filter circuit and 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 (8)
1. A direct current power supply of a filament of a vacuum electronic device is characterized by comprising an EMI filter circuit, an input rectification filter circuit, a BUCK conversion circuit, an LLC resonance circuit and an output rectification filter circuit which are electrically connected in sequence;
the monitoring unit is electrically connected with the input rectifying and filtering circuit and/or the BUCK conversion circuit and/or the LLC resonant circuit and/or the output rectifying and filtering circuit and is used for providing control signals required by the circuits and/or monitoring the working state and/or the operating parameters of the circuits.
2. The vacuum electronic filament dc power supply of claim 1, wherein the input rectifying filter circuit comprises an input bridge rectifying circuit or a PFC circuit, and a first filter circuit; the first filter circuit comprises a capacitor and/or an inductor.
3. 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.
4. The vacuum electronics filament dc power supply of claim 1, wherein the LLC resonant circuit comprises an inductor, a capacitor, and a high frequency transformer.
5. The vacuum electronics filament dc power supply of claim 1 wherein the output rectifier filter circuit comprises a full bridge rectifier circuit or a center tap rectifier circuit, and a second filter circuit; the second filter circuit comprises a capacitor and/or an inductor.
6. The vacuum electronics filament dc power supply of claim 1 wherein the monitoring unit further comprises a filament current detection module whose signal samples are derived from a current sensor on the output side.
7. The vacuum electronics filament dc power supply of claim 1, wherein the input rectifying filter circuit comprises a controllable semiconductor switching device and/or a non-controllable semiconductor switching 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 signal output by the monitoring unit carries out switching control on the controllable semiconductor switching device.
8. The vacuum electronic device filament dc power supply according to claim 7, wherein the controllable semiconductor switching 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921366750.5U CN210490742U (en) | 2019-08-21 | 2019-08-21 | Direct current power supply of vacuum electronic device filament |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921366750.5U CN210490742U (en) | 2019-08-21 | 2019-08-21 | Direct current power supply of vacuum electronic device filament |
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| CN210490742U true CN210490742U (en) | 2020-05-08 |
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| CN201921366750.5U Active CN210490742U (en) | 2019-08-21 | 2019-08-21 | Direct current power supply of vacuum electronic device filament |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115826664A (en) * | 2023-02-21 | 2023-03-21 | 苏州浪潮智能科技有限公司 | Voltage regulation circuit, method and device, and server power supply |
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2019
- 2019-08-21 CN CN201921366750.5U patent/CN210490742U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115826664A (en) * | 2023-02-21 | 2023-03-21 | 苏州浪潮智能科技有限公司 | Voltage regulation circuit, method and device, and server power supply |
| CN115826664B (en) * | 2023-02-21 | 2023-05-12 | 苏州浪潮智能科技有限公司 | Voltage regulation circuit, method and device and server power supply |
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Address after: 618000 No.19 Tumenjiang Road, 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. |