CN202840988U - High voltage cathode power supply with high precision - Google Patents
High voltage cathode power supply with high precision Download PDFInfo
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- CN202840988U CN202840988U CN 201220272693 CN201220272693U CN202840988U CN 202840988 U CN202840988 U CN 202840988U CN 201220272693 CN201220272693 CN 201220272693 CN 201220272693 U CN201220272693 U CN 201220272693U CN 202840988 U CN202840988 U CN 202840988U
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Abstract
The utility model relates to a high voltage cathode power supply with high precision. The high voltage cathode power supply with high precision comprises a BUCK circuit, wherein an output end of the BUCK circuit is connected with an input end of a full bridge circuit, an output end of the full bridge circuit is connected with an input end of a filter circuit through an isolation voltage boost circuit and a rectification circuit in order, an output end of the filter circuit is respectively connected with input ends of load and a linear voltage stabilizing circuit, an output end of the linear voltage stabilizing circuit is connected with an input end of the control circuit, and an output end of the control circuit is respectively connected with input ends of the BUCK circuit and the full bridge circuit. According to the high voltage cathode power supply, the pi-type filter circuit is employed for filtration in the filter circuit, and a linear voltage stabilizing tube is connected in series in the pi-type filer circuit, so high frequency ripple waves are effectively filtered; double closed loop adjustment is realized in control circuit by employing a PID controller to realize performances of low ripple and high precision of the high voltage stabilized voltage cathode power supply.
Description
Technical field
The utility model relates to the high voltage source field, especially a kind of high-precision cathode high voltage power supply.
Background technology
At present, high voltage source has been widely used in the checkout equipments such as medical science, also is widely used in military fields such as travelling-wave tube amplifier, radar transmitter.The efficient work of travelling-wave tube amplifier and radar transmitter, accuracy and high maneuverability are high performance a special kind of skill of research power supply, comprising indexs such as the stability of power supply, high efficiency, miniaturizations.In the working power of domestic and international existing travelling-wave tube amplifier and transmitter, its working power has filament supply, positive bias power supply, back bias voltage power supply, cathode high voltage power supply and collector high voltage source, usually the cathode high voltage power supply ripple is the key factor that affects transmitter spectrum, so the performance index such as the ripple of target high voltage source, precision propose higher requirement.
Traditional high voltage source volume is large, heavy, has had a strong impact on the development of institute's corollary equipment.The problems such as along with the development of power electronic technology, present high voltage source adopts the Switching Power Supply form more, and its circuit block diagram although greatly reduce volume weight, has improved power, efficient as shown in Figure 1, still exists the ripple of power supply still very large, and precision is lower.
The utility model content
The purpose of this utility model is to provide the high-precision cathode high voltage power supply that a kind of precision is high, power supply ripple is little.
For achieving the above object, the utility model has adopted following technical scheme: a kind of high-precision cathode high voltage power supply, comprise the BUCK circuit, its output links to each other with the input of full-bridge circuit, the output of full-bridge circuit links to each other with the input of filter circuit by isolation boosting circuit, rectification circuit successively, the output of filter circuit links to each other with the input of load, linear voltage-stabilizing circuit respectively, the output of linear voltage-stabilizing circuit links to each other with the input of control circuit, and the output of control circuit links to each other with the input of BUCK circuit, full-bridge circuit respectively.
As shown from the above technical solution, the utility model adopts the BUCK circuit to combine with full-bridge circuit as the main circuit form, adopt soft switch harmonic technology to reduce the power switch pipe loss, realized the switch change-over of zero-voltage state, efficiently solve the switching loss problem under the high frequency condition, better improved the conversion efficiency of power supply; Not only adopt π type filter circuit to carry out filtering in the filter circuit, and seal in the linear voltage stabilization pipe at π type filter circuit, more effective filtering output high frequency ripple; In control circuit, adopt the two closed loop adjustment of PID controller, realize the high accuracy of cathode high voltage stabilized voltage power supply, the performance of low ripple.
Description of drawings
Fig. 1 is the circuit block diagram of existing high voltage source;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
A kind of high-precision cathode high voltage power supply, comprise BUCK circuit 1, its output links to each other with the input of full-bridge circuit 2, the output of full-bridge circuit 2 links to each other with the input of filter circuit 5 by isolation boosting circuit 3, rectification circuit 4 successively, the output of filter circuit 5 links to each other with the input of load 6, linear voltage-stabilizing circuit 7 respectively, the output of linear voltage-stabilizing circuit 7 links to each other with the input of control circuit 8, the output of control circuit 8 links to each other with the input of BUCK circuit 1, full-bridge circuit 2 respectively, as shown in Figure 1.The input of described isolation boosting circuit 3 links to each other with the output of full-bridge circuit 2, the output of isolation boosting circuit 3 links to each other with the input of rectification circuit 4, the output of rectification circuit 4 links to each other with the input of filter circuit 5, and described rectification circuit 4 adopts full bridge rectifier or voltage doubling rectifing circuit.Described main switch V2 adopts metal-oxide-semiconductor, and described switching tube V4, V5, V6, V7 are metal-oxide-semiconductor.During work, direct current for full-bridge circuit 2 provides voltage, is connected with high frequency transformer elementary behind the full-bridge high-frequency high-efficiency inversion and carries out isolation boosting after BUCK circuit 1 carries out step-down, carries out rectification circuit 4 rectifying and wave-filterings behind the isolation boosting.
As shown in Figure 1, described BUCK circuit 1 comprises the rectifier bridge V1 that connects the 220V alternating current, and rectifier bridge V1 is transformed to 300V left and right sides direct current with 220V alternating current in the electrical network, for follow-up BUCK circuit 2; The positive pole of rectifier bridge V1 with link to each other with negative electrode, resistance R 1 and the parallel connected end of filter capacitor C1 of fly-wheel diode V3 respectively, the negative pole of rectifier bridge V1 links to each other with the source S of main switch V2, the drain electrode of main switch V2 links to each other with the anode of fly-wheel diode V3, the end of energy storage inductor L1 respectively, the other end connecting resistance R1 of energy storage inductor L1 and the parallel connected end of filter capacitor C1, the output of the grid connection control circuit 8 of fly-wheel diode V3; Described full-bridge circuit 2 comprises switching tube V4, V5, V6, V7, switching tube V4, the base stage of V5 links to each other, switching tube V6, the base stage of V7 links to each other, switching tube V4, V5, V6, the output of the equal connection control circuit 8 of the base stage of V7, switching tube V4, after linking, the collector electrode of V6 connects the output of BUCK circuit 1, the emitter of switching tube V4 and the input that connects isolation boosting circuit 3 after the collector electrode of switching tube V5 links to each other, the emitter of switching tube V6 and the input that connects isolation boosting circuit 3 after the collector electrode of switching tube V7 links to each other, switching tube V5, after linking, the emitter of V7 connects the output of BUCK circuit 1.
BUCK circuit 1 combines as the main circuit form with driving force full-bridge circuit 2 strong, that efficient is higher, adopt soft switch technique to reduce the power switch pipe loss, realized the switch change-over of zero-voltage state, efficiently solve the switching loss problem under the high frequency condition, greatly reduce volume, the weight reduction of cathode high voltage power supply, and minimizing provides the basis of necessity to the technostress of cooling system for the miniaturization of travelling-wave tube amplifier and radar transmitter.When the impedance of input voltage variation or load 6 changed, control circuit 8 was regulated the duty ratios of main switch V2 automatically, makes output voltage stabilization.
As shown in Figure 1, described filter circuit 5 comprises resistance R 2, the one end links to each other with the output of rectification circuit 4, its other end and resistance R 3, the R6 series connection, one end of resistance R 4 links to each other with the output of rectification circuit 4, the other end of resistance R 4 links to each other with resistance R 5, one of capacitor C 2 terminates at resistance R 2, between the R3, the other end is connected on resistance R 4, between the R5, resistance R 5 respectively with the drain D of linear voltage stabilization pipe V8, the input of linear voltage-stabilizing circuit 7 links to each other, the grid of linear voltage stabilization pipe V8 links to each other with the input of linear voltage-stabilizing circuit 7, the source electrode of linear voltage stabilization pipe V8 respectively with capacitor C 3, resistance R 7 links to each other, resistance R 6, R7 respectively with resistance R 16, R17 links to each other, resistance R 16, be attempted by the two ends of load 6 after the R17 series connection, the input of linear voltage-stabilizing circuit 7 is connected on resistance R 16, between the R17.Resistance R 2, R4, R6, R7 carry out the current spike compacting, the π type filter circuit that is comprised of capacitor C 2, resistance R 3, resistance R 5, capacitor C 3 again carries out filtering, and in π type filter circuit, seal in linear voltage stabilization pipe V8, high frequency ripple is exported in more effective filtering, and thump and hypobaric are had preferably adaptability.
As shown in Figure 1, described linear voltage-stabilizing circuit 7 comprises amplifier N1, its normal phase input end meets adjustable reference voltage Vref1, its inverting input links to each other with capacitor C 6, capacitor C 7, resistance R 14, resistance R 15 respectively, capacitor C 6 is connected with resistance R 13, resistance R 13, capacitor C 7, resistance R 14 all connect the output of amplifier N1, the output of amplifier N1 links to each other with the grid G of linear voltage stabilization pipe V8, resistance R 15 is connected between resistance R 16, the R17, resistance R 11 is connected with resistance R 12, the drain D of the linear voltage-stabiliser tube V8 of one termination of resistance R 11, an end ground connection of resistance R 12.Described control circuit 8 comprises amplifier N2, its normal phase input end meets adjustable reference voltage Vref2, its inverting input links to each other with capacitor C 5, capacitor C 4, resistance R 8 respectively, capacitor C 5 is connected with resistance R 9, resistance R 9, capacitor C 4, resistance R 8 all link to each other with the output of amplifier N2, capacitor C 5 links to each other with an end of resistance R 10, the other end of resistance R 10 is connected between resistance R 11, the resistance R 12, the output of amplifier N2 links to each other with the input of PWM chip, and the output of PWM chip links to each other with the base stage of the grid G of main switch V2, switching tube V4, V5, V6, V7 respectively.
Amplifier N1 and resistance R 15, capacitor C 6, resistance R 13, capacitor C 7, resistance R 14 have formed a PID controller circuitry, are used for voltage between control switch mosfet pipe V8 drain-source; Resistance R 15 is closed loop gain resistance, and the input potential value is Vo-sample1; Current potential Vo-sample1 is cathode high voltage through resistance R 17, R16 line sampling dividing potential drop and gained current potential after oppositely amplifying on year-on-year basis.The output voltage of the one PID controller circuitry control cathode high voltage source, that grid voltage Ug by metal-oxide-semiconductor Characteristics Control linear voltage stabilization pipe V8 realizes, the grid voltage Ug of linear voltage stabilization pipe V8 controls the drain-source voltage Vds of linear voltage-stabiliser tube V8 again, linear voltage stabilization pipe V8 drain-source voltage Vds obtains sampled voltage Vmos_sample through resistance R 12, R11 linear scale dividing potential drop, and sampled voltage Vmos_sample connects with an end of closed loop gain resistance R 10.The output of described amplifier N2 connects with the PWM chip, the driving of PWM chip controls BUCK circuit 1 and the driving of full-bridge circuit 2.Amplifier N2 and resistance R 10, capacitor C 5, resistance R 9, capacitor C 4, resistance R 8 form the 2nd PID controller circuitry, and the output that is used for control PWM chip drives pulsewidth.
Embodiment one
This example is-30kV that output current is the cathode power of 20mA for output voltage.This Power Management Design is the AC220V power supply, and the resistance of output loading 6 is 1.5M Ω.
When circuit is started working, after at first being isolated by the driving signal of the frequency more than the generation 100kHz in the control circuit 8 and pulsewidth, driving is provided for the main switch V2 in the BUCK circuit 1.Provide driving to switching tube V4, V5, V6, V7 in the full-bridge circuit 2 after being isolated by the driving signal of the same frequency pulsewidth that produces in the control circuit 8 simultaneously.
When+300V direct current after BUCK circuit 1 carries out step-down, again through full-bridge circuit 2 high-efficiency inversions, be connected with the high frequency transformer of 30kV elementary and carry out isolation boosting, carry out two voltage doubling rectifying circuit behind the isolation boosting and carry out overlapped in series, voltage after the stack carries out filtering through π type filter circuit again, again with linear voltage-stabilizing circuit 7 coupled in series.
When input voltage changes or load impedance when changing, control circuit 8 is regulated the duty ratios of main switch V2 automatically, makes output voltage stabilization.
This supply voltage maintenance process is comprised of two processes:
When circuit is started working, at first control circuit control main switch V2 is open-minded, fly-wheel diode V3 instead ends partially, input voltage is powered to resistance R 1 by energy storage inductor L1, charge to filter capacitor C1 simultaneously, the interior electric current of energy storage inductor L1 this moment increases gradually, and the magnetic field energy of storage also increases gradually; Secondly, through after certain ON time, when the current potential of control main switch V2 is low level, main switch V2 cut-off, because the electric current of energy storage inductor L1 can't suddenly change, so the two ends at it produce a self-induction electromotive force, make fly-wheel diode V3 conducting, this moment, energy storage inductor L1 passed to resistance R 1 and filter capacitor C1 to the magnetic field energy of storage.
In a word, the utility model adopts BUCK circuit 1 to combine as the main circuit form with full-bridge circuit 2, adopt soft switch harmonic technology to reduce the power switch pipe loss, realized the switch change-over of zero-voltage state, efficiently solve the switching loss problem under the high frequency condition, better improved the conversion efficiency of power supply; Not only adopt π type filter circuit to carry out filtering in the filter circuit 5, and seal in the linear voltage stabilization pipe at π type filter circuit, more effective filtering output high frequency ripple; In control circuit 8, adopt the two closed loop adjustment of PID controller, realize the high accuracy of cathode high voltage stabilized voltage power supply, the performance of low ripple.
Claims (7)
1. high-precision cathode high voltage power supply, it is characterized in that: comprise BUCK circuit (1), its output links to each other with the input of full-bridge circuit (2), the output of full-bridge circuit (2) is successively by isolation boosting circuit (3), rectification circuit (4) links to each other with the input of filter circuit (5), the output of filter circuit (5) respectively with load (6), the input of linear voltage-stabilizing circuit (7) links to each other, the output of linear voltage-stabilizing circuit (7) links to each other with the input of control circuit (8), the output of control circuit (8) respectively with BUCK circuit (1), the input of full-bridge circuit (2) links to each other.
2. high-precision cathode high voltage power supply according to claim 1, it is characterized in that: described BUCK circuit (1) comprises the rectifier bridge V1 that connects the 220V alternating current, the positive pole of rectifier bridge V1 with respectively with the negative electrode of fly-wheel diode V3, resistance R 1 links to each other with the parallel connected end of filter capacitor C1, the negative pole of rectifier bridge V1 links to each other with the source S of main switch V2, the drain electrode of main switch V2 respectively with the anode of fly-wheel diode V3, the end of energy storage inductor L1 links to each other, the other end connecting resistance R1 of energy storage inductor L1 and the parallel connected end of filter capacitor C1, the output of the grid connection control circuit (8) of fly-wheel diode V3; Described full-bridge circuit (2) comprises switching tube V4, V5, V6, V7, switching tube V4, the base stage of V5 links to each other, switching tube V6, the base stage of V7 links to each other, switching tube V4, V5, V6, the output of the equal connection control circuit of the base stage of V7 (8), switching tube V4, after linking, the collector electrode of V6 connects the output of BUCK circuit (1), the emitter of switching tube V4 and the input that connects isolation boosting circuit (3) after the collector electrode of switching tube V5 links to each other, the emitter of switching tube V6 and the input that connects isolation boosting circuit (3) after the collector electrode of switching tube V7 links to each other, switching tube V5, after linking, the emitter of V7 connects the output of BUCK circuit (1).
3. high-precision cathode high voltage power supply according to claim 1, it is characterized in that: the input of described isolation boosting circuit (3) links to each other with the output of full-bridge circuit (2), the output of isolation boosting circuit (3) links to each other with the input of rectification circuit (4), the output of rectification circuit (4) links to each other with the input of filter circuit (5), and described rectification circuit (4) adopts full bridge rectifier or voltage doubling rectifing circuit.
4. high-precision cathode high voltage power supply according to claim 2 is characterized in that: described main switch V2 adopts metal-oxide-semiconductor, and described switching tube V4, V5, V6, V7 are metal-oxide-semiconductor.
5. high-precision cathode high voltage power supply according to claim 2, it is characterized in that: described filter circuit (5) comprises resistance R 2, the one end links to each other with the output of rectification circuit (4), its other end and resistance R 3, the R6 series connection, one end of resistance R 4 links to each other with the output of rectification circuit (4), the other end of resistance R 4 links to each other with resistance R 5, one of capacitor C 2 terminates at resistance R 2, between the R3, the other end is connected on resistance R 4, between the R5, resistance R 5 respectively with the drain D of linear voltage stabilization pipe V8, the input of linear voltage-stabilizing circuit (7) links to each other, the grid of linear voltage stabilization pipe V8 links to each other with the input of linear voltage-stabilizing circuit (7), the source electrode of linear voltage stabilization pipe V8 respectively with capacitor C 3, resistance R 7 links to each other, resistance R 6, R7 respectively with resistance R 16, R17 links to each other, resistance R 16, be attempted by the two ends of load (6) after the R17 series connection, the input of linear voltage-stabilizing circuit (7) is connected on resistance R 16, between the R17.
6. high-precision cathode high voltage power supply according to claim 5, it is characterized in that: described linear voltage-stabilizing circuit (7) comprises amplifier N1, its normal phase input end meets adjustable reference voltage Vref1, its inverting input respectively with capacitor C 6, capacitor C 7, resistance R 14, resistance R 15 links to each other, capacitor C 6 is connected with resistance R 13, resistance R 13, capacitor C 7, resistance R 14 all connects the output of amplifier N1, the output of amplifier N1 links to each other with the grid G of linear voltage stabilization pipe V8, resistance R 15 is connected on resistance R 16, between the R17, resistance R 11 is connected with resistance R 12, the drain D of the linear voltage-stabiliser tube V8 of one termination of resistance R 11, an end ground connection of resistance R 12.
7. high-precision cathode high voltage power supply according to claim 6, it is characterized in that: described control circuit (8) comprises amplifier N2, its normal phase input end meets adjustable reference voltage Vref2, its inverting input respectively with capacitor C 5, capacitor C 4, resistance R 8 links to each other, capacitor C 5 is connected with resistance R 9, resistance R 9, capacitor C 4, resistance R 8 all links to each other with the output of amplifier N2, capacitor C 5 links to each other with an end of resistance R 10, the other end of resistance R 10 is connected on resistance R 11, between the resistance R 12, the output of amplifier N2 links to each other with the input of PWM chip, the output of PWM chip respectively with the grid G of main switch V2, switching tube V4, V5, V6, the base stage of V7 links to each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220272693 CN202840988U (en) | 2012-06-11 | 2012-06-11 | High voltage cathode power supply with high precision |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220272693 CN202840988U (en) | 2012-06-11 | 2012-06-11 | High voltage cathode power supply with high precision |
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| CN202840988U true CN202840988U (en) | 2013-03-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9831793B2 (en) | 2013-12-06 | 2017-11-28 | General Electric Technology Gmbh | Control apparatus for a power converter |
| CN109343628A (en) * | 2018-11-08 | 2019-02-15 | 深圳航天科技创新研究院 | A kind of high-voltage linear source of stable pressure |
| CN109412433A (en) * | 2018-12-14 | 2019-03-01 | 中国电子科技集团公司第四十三研究所 | A kind of linear regulation circuit and method of adjustment suitable for three road output switch power sources |
| CN113541449A (en) * | 2021-09-16 | 2021-10-22 | 深圳英集芯科技股份有限公司 | Current detection device and boost conversion system |
| CN115692138A (en) * | 2023-01-03 | 2023-02-03 | 华中科技大学 | Cathode high-voltage power supply for frequency modulation of terahertz gyrotron |
-
2012
- 2012-06-11 CN CN 201220272693 patent/CN202840988U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9831793B2 (en) | 2013-12-06 | 2017-11-28 | General Electric Technology Gmbh | Control apparatus for a power converter |
| CN109343628A (en) * | 2018-11-08 | 2019-02-15 | 深圳航天科技创新研究院 | A kind of high-voltage linear source of stable pressure |
| CN109412433A (en) * | 2018-12-14 | 2019-03-01 | 中国电子科技集团公司第四十三研究所 | A kind of linear regulation circuit and method of adjustment suitable for three road output switch power sources |
| CN109412433B (en) * | 2018-12-14 | 2023-10-24 | 中国电子科技集团公司第四十三研究所 | Linear adjusting circuit and adjusting method suitable for three-way output switching power supply |
| CN113541449A (en) * | 2021-09-16 | 2021-10-22 | 深圳英集芯科技股份有限公司 | Current detection device and boost conversion system |
| CN115692138A (en) * | 2023-01-03 | 2023-02-03 | 华中科技大学 | Cathode high-voltage power supply for frequency modulation of terahertz gyrotron |
| CN115692138B (en) * | 2023-01-03 | 2023-04-07 | 华中科技大学 | Cathode high-voltage power supply for frequency modulation of terahertz gyrotron |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20190611 |