CN201051719Y - Controllable digital high-voltage power supply for current conversion technology - Google Patents
Controllable digital high-voltage power supply for current conversion technology Download PDFInfo
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- CN201051719Y CN201051719Y CNU2007200074509U CN200720007450U CN201051719Y CN 201051719 Y CN201051719 Y CN 201051719Y CN U2007200074509 U CNU2007200074509 U CN U2007200074509U CN 200720007450 U CN200720007450 U CN 200720007450U CN 201051719 Y CN201051719 Y CN 201051719Y
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Abstract
The utility model relates to a controllable digital high voltage power source which is applied to the electrorheological technology, wherein the main circuit structure of the power source comprises an input commutating filtration circuit, a BUCK voltage pre-stabilization circuit, a semi-bridge contravariant boost pressure circuit, and an output commutating filtration circuit. The digital controlled portion of the power source uses an advanced single chip microcomputer dsPIC30F3011 with the DSP function which is produced by the Microsoft Company as the controlling nucleus. The power source adopts the digital controlled circuit, which reduces the number of periphery components and reduces unstable factors, and the system has better robustness. The processor dsPIC30F3011 of the power source adopts the PID controlling algorithm approach, which improves the preciseness of the power source. And the power source adopts the RS 232 and communicates with a PC computer, users can conveniently read parameters such as voltage and the like on the computer, and voltage of the power source can be regulated according to the variation of the keyboard input signal, and the regulation of the voltage has reversibility and consistency.
Description
Technical field:
The utility model relates to a kind of controllable digital high voltage source that is applied to electro-rheological technology.
Background technology:
A micro numerical high voltage source of Tsing-Hua University's development (is seen document [1] Dong Yuzhen, Jin Dewen, Tang Xikuan, the Zhang Ji river. the research of micro numerical high voltage source. high voltage technique, the 20th the 4th phase of volume of December in 1994 .), its characteristics are as follows: power supply is controlled by Single Chip Microcomputer (SCM) program, with the small battery is the energy, the voltage that is up to 2000V output is provided, adopt two high-frequency step-up transformers to boost, the step-up ratio of each transformer is 30, changes by extraneous control variables, imports single-chip microcomputer into through the AD conversion, export an aanalogvoltage by single-chip microcomputer through the DA mouth again, after power amplification and HF switch translation circuit become the primary coil that high frequency rectangle pulsating voltage is added on high frequency transformer, boosting obtains the rectangular pulse of required amplitude, obtains required voltage through rectifying and wave-filtering.Power supply open loop control, the push-pull type inversion, power is very little, is 0.5W.
A micro numerical high voltage source of Northwestern Polytechnical University's development (see document [2] Yang Jungang. electrorheological particle phase dielectric property method of testing and high-pressure mini power supply are made. the Master's thesis .P46-54. of Northwestern Polytechnical University), its characteristics are as follows: with the piezoelectricity high pressure generator as stepup transformer, with the 6V powered battery, reduced the volume of power supply greatly, by variable resistance the high pressure generator input terminal voltage is regulated control continuously, to obtain exporting the continually varying high voltage, circuit open loop control, peak power output 1W, output voltage 0～10kV.
A high voltage source of north Polytechnics development (see document [3] Xie Feng. current transformation vibration damper and suspension control system research thereof. Beijing Institute of Technology's master thesis, .P52～55. in 2003), its characteristics are as follows: circuit adopts single-ended flyback DC-DC inversion, with the integrated output transformer of television set as step-up transformer, utilize three terminal regulator to regulate the transformer input terminal voltage, thereby obtain required output voltage, system's open loop control, maximum output voltage 8kV.
A numerical control high voltage power supply of University Of Xiangtan's development (is seen document [4] Liu Qiyuan, Zhu Shisha, Wang Qixin, Wei Kexiang, Zhang Jianchun. a kind of CNC high-pressure source design based on technology. University Of Xiangtan's natural science journal, the 26th the 1st phase of volume of March in 2004 .), its characteristics are as follows: power supply is by Single-chip Controlling, and the aanalogvoltage of output 0～5V is regulated pwm signal by pulse-width regulated special chip SG3524 again, the duty ratio time of control single-ended reverse exciting circuit, realization is to the adjustment of output voltage, and the integrated line output transformation that adopts television set is adjusted turn ratio position 1000 as step-up transformer, system's closed-loop control, output voltage 0～3900V.
Guangdong Maoming College development be that the DC high-voltage power supply of a automatic Regulation on a large scale (is seen document [5] Wang Anmin, Li Jianxin, Huang Chonglin. the research of automatic Regulation direct current pulse power source on a large scale. power electronic technology, the 38th the 1st phase of volume of February in 2004 .), its characteristics are as follows: be mainly used on the electrorheological fluid damping vibration attenuation Digit Control Machine Tool, circuit adopts the Two Stages structure, prime is controlled the PWM output of pulse-width modulation special chip SG3524 by the certain aanalogvoltage of single-chip microcomputer output, realization is to the adjusting of step-up transformer input voltage, the second level adopts the single-ended flyback structure to carry out the DC-DC inversion, system's closed-loop control, maximum output voltage 20kV, maximum output current 5mA, peak power output has reached 100W.
The electrorheological of Zhejiang University's development (is seen document [6] Xu Cangsu with the controllable high-voltage power supply; Li Guangming. electrorheological controllable high-voltage power supply. the number of applying for a patent: 200410018587.5), the vibration of being made up of two-way DC-voltage supply circuit, integrated pulse width modulator and relay and the voltage doubling rectifing circuit of protective circuit, inverter main circuit and output high-tension electricity are formed.Can in time respond according to the change of external control signal, required voltage is provided, and in the voltage-regulation process, have invertibity and continuity, output voltage 0～50kV, output current 0:1mA.
Published or the situation of the technology of public use from existing, the control method that is applied to the power supply of electro-rheological technology also need be improved.Above-mentioned power supply adopts simulation control basically; though the explanation of some of them power-supply system has utilized digital control method; but in these structures; the closed-loop control of main power circuit and error protection are all realized by analog circuit; single-chip microcomputer is responsible for the collection of circuit parameter and fault-signal; and these data are passed to the external world; receive extraneous order and data simultaneously; single-chip microcomputer be not used in generate the required drive signal of power switch pipe with realize relevant control algorithm, do not participate in the control of main circuit directly.Therefore, these power supplys can only be called " numeral is auxiliary " product, the still traditional simulation control of the main circuit control of power supply.
There are some shortcomings in the traditional simulation control of power supply: (1) analog control circuit is owing to using a large amount of components and parts to need very large space, the parameter of these components and parts itself also can change along with the variation of service time, temperature and other environmental conditions, and the stability of a system and responding ability are caused negative effect.(2) the simulation control loop is towards a certain loads that the range of definition is narrow.The control response characteristic of simulation control is by the parameter decision of discrete component, therefore can't provide optimized control response for all power values or POL.If the load variations wide ranges then is difficult in and adjusts analogue loop in the whole excursion of load.(3) analog control circuit is difficult for introducing relevant control algorithm, is unfavorable for the raising of power supply precision.
Summary of the invention:
The purpose of this utility model is to provide a kind of controllable digital high voltage source that is applied to electro-rheological technology, thereby shortcomings such as this power supply adopts that digital control circuit has overcome that the traditional analog control circuit takes up room greatly, stability of a system difference and responding ability difference guarantee to improve the performance of high voltage source.
The utility model adopts following design: this power supply is made up of digital control structure two parts of main circuit structure and power supply, described main circuit structure comprises input rectifying filter circuit, the pre-voltage stabilizing circuit of BUCK, semi-bridge inversion booster circuit, output rectifier and filter, and the AC power of input is exported high pressure through semi-bridge inversion booster circuit, output rectifier and filter again through the pre-voltage stabilizing circuit of current rectifying and wave filtering circuit input BUCK; The digital control part of power supply comprises single-chip microcomputer dsPIC30F3011 and keyboard input circuit, LCD liquid crystal display circuit, PC communication interface, overvoltage crowbar, driving isolation module, output voltage feedback circuit; the keyboard input circuit is connected to the input of single-chip microcomputer; the LCD liquid crystal display circuit is connected to the output of single-chip microcomputer; the communication interface of single-chip microcomputer is connected with PC by RS232; the output of single-chip microcomputer is connected to the input that drives isolation module, and the output that drives isolation module is connected to pre-voltage stabilizing circuit of BUCK and semi-bridge inversion booster circuit again.
The utility model is made up of digital control structure two parts of main circuit structure and power supply.The main circuit structure of power supply comprises input rectifying filter circuit, the pre-voltage stabilizing circuit of BUCK, semi-bridge inversion booster circuit, output rectifier and filter.It is by the BUCK circuit 220V civil power of input to be carried out lowering and stabilizing blood pressure that electric power main circuit adopts two-layer configuration, first order structure, and pressure regulation that can be in a big way; The second level is by the half-bridge circuit inversion boosting.Adopt the two-dimensional transform structure can obtain the higher precision of voltage regulation, pressure regulating performance is also better.The digital control part of power supply selects for use the senior single-chip microcomputer dsPIC30F3011 with DSP function that little core company produces as the control core, mainly finishes the keyboard input, and the LCD liquid crystal display is regulated control main circuit voltage, with PC communication, functions such as overvoltage protection.Its remarkable advantage: the one, the digital control part of power supply selects for use the senior single-chip microcomputer dsPIC30F3011 with DSP function that little core company produces as the control core, and adopts pid control algorithm so can improve the power supply precision greatly; The 2nd, adopt RS232 to communicate by letter with PC, make the user can read parameters such as voltage very easily on computers.The 3rd, supply voltage is according to the change scalable of keyboard input signal, and the adjusting of voltage has invertibity and continuity.
Below in conjunction with drawings and Examples the utility model is specifically described.
Description of drawings:
Fig. 1 is the utility model circuit general structure block diagram.
Fig. 2 is input rectifying filter circuit of the present utility model and the pre-voltage stabilizing circuit figure of BUCK.
Fig. 3 is semi-bridge inversion booster circuit of the present utility model and output rectifier and filter figure.
Fig. 4 is the digital control partial circuit figure of the utility model power supply.
Fig. 5 is the circuit diagram of the utility model accessory power supply part.
Embodiment:
The utility model is to constitute like this: this power supply is made up of digital control structure two parts of main circuit structure and power supply, described main circuit structure comprises input rectifying filter circuit, the pre-voltage stabilizing circuit of BUCK, semi-bridge inversion booster circuit, output rectifier and filter, and the AC power of input is exported high pressure through semi-bridge inversion booster circuit, output rectifier and filter again through the pre-voltage stabilizing circuit of current rectifying and wave filtering circuit input BUCK; The digital control part of power supply comprises single-chip microcomputer dsPIC30F3011 and keyboard input circuit, LCD liquid crystal display circuit, PC communication interface, overvoltage crowbar, driving isolation module, output voltage feedback circuit; the keyboard input circuit is connected to the input of single-chip microcomputer; the LCD liquid crystal display circuit is connected to the output of single-chip microcomputer; the communication interface of single-chip microcomputer is connected with PC by RS232; the output of single-chip microcomputer is connected to the input that drives isolation module, and the output that drives isolation module is connected to pre-voltage stabilizing circuit of BUCK and semi-bridge inversion booster circuit again.
The input rectifying filter circuit of the main circuit structure of above-mentioned power supply is by fuse FUSE1, and rectifier bridge B1 and input filter capacitor C105 form, and its effect is the direct voltage that obtains the 358V effect.Adopt the input of civil power 220V alternating current in the design, through the direct voltage that obtains pulsing after the rectifier bridge B1 full-bridge rectification, input electrolytic capacitor filter C105 is used for level and smooth this direct voltage, and its pulsation is reduced.In order to remove the high frequency voltage spike, in the good noninductive capacitor C 106 of CBB of the two ends of alminium electrolytic condenser difference high frequency performance in parallel.
The pre-voltage stabilizing circuit of the BUCK of the main circuit structure of power supply is by power switch pipe Q1 (model IRFPE60), drive circuit, inverse parallel diode D1 (model MUR860), afterflow diode D5 (model MUR860), inductance L 2 and output filter capacitor C110, C111, C112 form, the effect of the pre-voltage stabilizing circuit of BUCK is that the direct voltage that rectification obtains is carried out lowering and stabilizing blood pressure, realizes pressure regulation in a big way.L2 and C110, C111, C112 constitute the LC filter, and D5 realizes afterflow when Q1 turn-offs.The drive circuit that is connected with Q1 is by resistance R103, grid voltage amplitude limit resistance R 102, and voltage stabilizing didoe DZ1, DZ2 and diode D2 constitute.R103 is used to improve the drive characteristic of Q1, and D2 is used for clamper, and R102, DZ1, DZ2 realize limiting the gate-source voltage of Q1 jointly.It is the KD101L that Beijing Luo Muyuan company produces that driver for isolating adopts signal driver.The drive circuit that is connected with single-chip microcomputer dsPIC30F3011 is by triode Q4, Q5 (model 9013,9012), diode D3, D4 (model SR260), and resistance R 104, capacitor C 108, C109 form.The driving pulse control triode Q4 that single-chip microcomputer dsPIC30F3011 produces, the break-make of Q5 alternately produce the voltage of 15V, 0V at 1,2 ends of KD101L, and KD101L is transferred to 4,6 ends with it.Basic functional principle according to the BUCK topology knows, the size that the duty ratio of the driving pulse by regulating power switch pipe Q1 can control output voltage, and the duty ratio size of control PWM2L promptly reaches the control purpose on single-chip microcomputer dsPIC30F3011.
The semi-bridge inversion booster circuit of the main circuit structure of power supply is by resistance R 105, R106, capacitor C 113, C114, and power switch pipe Q2, Q3 (model is IRFP460), buffer circuit, diode D14, D15, drive circuit and high frequency high voltage transformer T2 form.Wherein the effect of R105, R106 and C113, C114 is a dividing potential drop.Buffer circuit is made up of D12, R111, C115 and D13, R112, C116, and its effect is the loss that reduces Q2, brings when Q3 turns on and off.The effect of D14, D15 is that voltage clamp with Q2, Q3 two ends is in input voltage.T2 is raised to required high voltage with elementary low-voltage.The drive circuit that is connected with Q2, Q3 is by resistance R107, R108, diode D6, D7, and grid voltage amplitude limit resistance R 109, R110, voltage stabilizing didoe DZ3, DZ4, DZ5, DZ6 constitute.It is the KD301L that Beijing Luo Muyuan company produces that driver for isolating adopts signal driver.The drive circuit that is connected with single-chip microcomputer dsPIC30F3011 is by triode Q6, Q7, Q8, Q9, diode D8, D9, D10, D11, and resistance R 113, capacitor C 119, C120 form.The effect of above-mentioned each components and parts is similar to the effect of the components and parts of drive circuit in the pre-voltage stabilizing circuit of BUCK.The break-make of the driving pulse control triode Q6 that single-chip microcomputer dsPIC30F3011 produces, Q7, Q8, Q9 alternately produces the voltage of 15V, 0V at 4,5 and 6,5 ends of KD301L, and KD301L is transferred to 1,2 and 8,9 ends with it.Basic functional principle according to the semi-bridge inversion topology is known, controls the elementary generation rectangular-wave alternating-current low-voltage of the break-make of Q2, Q3 at T2 by the driving pulse of drive circuit, by boosting at secondary generation rectangular-wave alternating-current high voltage of T2.
The output rectifier and filter of the main circuit structure of power supply is by D16, D17, D18, D19 (model 2CL), high-frequency and high-voltage electric capacity C123, and bleeder circuit is formed.D16, D17, D18, D19 form the rectification full-bridge, and C123 is used for filtering.That adopt in the bleeder circuit design is 10 1M Ω, withstand voltage 1414V, the resistance series connection of rated power 2W.Maximum output voltage is 6kV, and the A/D acquisition module maximum voltage of dsPIC chip can only be exported 5V, so sampled voltage must be controlled in the 5V, the metalfilmresistor that adopts 5.1K here is a sampling resistor.Repack the electric current gauge outfit of 100 μ A into the voltmeter demonstration, itself and 80M Ω are connected, during full scale, output voltage is 8KV.
The digital control part of power supply selects for use the senior single-chip microcomputer dsPIC30F3011 with DSP function that little core company produces as the control core, has in the used major control of the design:
1. utilize the level of dsPIC chip to change interrupt function design button, can setting voltage value, but and real time modifying magnitude of voltage, in design, level is imported change notification pin (CNX) be set to input state, and initial value is high level, enables to draw function on CN pin weak, so just can save outside pull-up resistor.And other four common I/O mouth pins (RFX) are set to output state, output low level always, when button is pressed, level on the CN pin will be low from hypermutation, thereby interrupt, scan line by line again after taking place to interrupt and look into key, so both can save a large amount of cpu time, can simplify the structure of peripheral circuit again.The voltage of output can be set by keyboard, also can regulate and manage power-supply system, set magnitude of voltage can show by the LCD LCDs, that use in the design is WM-C1602N, the inside is integrated controller, driver, three parts of display are therefore as long as just can show the character code input.And LCD is parallel port input, because the I/O mouth of dsPIC3011 is limited, therefore can only send serial data by the SPI module, utilizes string to change again and chip 74LS164 becomes serial data into parallel data and is input in the middle of the LCD module.
2. utilize the CCPWM module output PWM waveform of dsPIC chip that the BUCK circuit is carried out pre-voltage regulation of voltage regulation control, utilize the PWM waveform of a pair of complementary symmetry of MCPWM module output of dsPIC chip, Dead Time can be set flexibly, thereby the control half-bridge inverter carries out the DC-DC inversion.The power switch pipe of the PWM drive waveform semi-bridge inversion booster circuit of a pair of complementary symmetry of the PWM1L of dsPIC3011, PWM1H output, the power switch pipe of the pre-voltage stabilizing circuit of PWM2L output PWM drive waveform BUCK.
3. utilize 10 AD modules of multichannel of dsPIC chip to gather the output voltage sampled signal, regulate the output pulse width of CCPWM by pid algorithm according to sampling voltage, regulate the output voltage of BUCK circuit, thereby the input voltage of control half-bridge inversion circuit is realized the output voltage negative feedback.Voltage sample circuit adopts isolation feedback circuit, adopts the IS0122 isolated amplifier of U.S. BB company design not only to finish insulating effect but also finish the signal amplification, shown in Fig. 2 circuit accompanying drawing (b).
4. utilize dsPIC chip UART module and computer to carry out communication, can control voltage by Computer signal.The chip that can realize RS232 communication is a lot, and what the design adopted is the MAX232/MAX232A reception/transmitter of MAXIM company.
In addition, accessory power supply provides driver for isolating KD101L, and KD301L, feedback chip and the required voltage of senior single-chip microcomputer dsPIC30F3011, accessory power supply be by transformer, rectifier bridge, and voltage-stabiliser tube and filter capacitor constitute.
The utility model course of work is as follows: at first, for power supply connects the civil power of 220V, then, set the size of required voltage on keyboard, at this moment, voltage swing also shows on Liquid Crystal Module LCD.Then, control chip dsPIC30F3011 produces corresponding duty ratio data according to the voltage swing of setting, the power switch pipe at the pre-voltage stabilizing circuit of the pulsed drive BUCK place that produces according to these duty ratio data and the power switch pipe at semi-bridge inversion booster circuit place.Judge the voltage that the sample circuit collection is returned, if driving pulse is then closed in overvoltage, promptly powered-down reaches the overvoltage protection purpose.If not overvoltage is then relatively asked voltage error with sampled voltage with setting reference voltage, adopt pid algorithm to calculate new dutyfactor value according to error, if dutyfactor value is excessive, then maximum duty cycle value output to set; If dutyfactor value can be not excessive, then revise duty cycle register with regulation voltage according to new dutyfactor value.Voltage-regulation is circulation again and again in control chip, up to the error of voltage in allowed band.Voltage data also can upload in the PC by RS232.If electric current is excessive in the course of the work, fuse burns, and reaches overcurrent protection.The technical performance of the utility model product is as follows:
Input voltage: AC220V
Output voltage: 500V-6KV is adjustable continuously
Peak power output: 60W
Maximal input: 90W
Regulative mode: button is regulated
Output current: maximum 10mA
Circuit overall efficiency: greater than 75%
Voltage ripple: less than 1%
The advantage of the utility model product and purposes.
This power supply advantage have following some:
(1) reduced peripheral component quantity, reduced destabilizing factor, system has robustness preferably.
(2) processor dsPIC30F3011 adopts pid control algorithm to improve the power supply precision.
(3) adopt RS232 to communicate by letter with PC, the user can read parameters such as voltage very easily on computers.
(4) supply voltage is according to the change scalable of keyboard input signal, and the adjusting of voltage has invertibity and continuity.
The research that is mainly used in electro-rheological technology and the experiment of power supply.
Claims (1)
1. controllable digital high voltage source that is applied to electro-rheological technology, it is characterized in that: this power supply is made up of digital control structure two parts of main circuit structure and power supply, described main circuit structure comprises input rectifying filter circuit, the pre-voltage stabilizing circuit of BUCK, semi-bridge inversion booster circuit, output rectifier and filter, and the AC power of input is exported high pressure through semi-bridge inversion booster circuit, output rectifier and filter again through the pre-voltage stabilizing circuit of current rectifying and wave filtering circuit input BUCK; The digital control part of power supply comprises single-chip microcomputer dsPIC30F3011 and keyboard input circuit, LCD liquid crystal display circuit, PC communication interface, overvoltage crowbar, driving isolation module, output voltage feedback circuit; the keyboard input circuit is connected to the input of single-chip microcomputer; the LCD liquid crystal display circuit is connected to the output of single-chip microcomputer; the communication interface of single-chip microcomputer is connected with PC by RS232; the output of single-chip microcomputer is connected to the input that drives isolation module, and the output that drives isolation module is connected to pre-voltage stabilizing circuit of BUCK and semi-bridge inversion booster circuit again.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2007200074509U CN201051719Y (en) | 2007-06-26 | 2007-06-26 | Controllable digital high-voltage power supply for current conversion technology |
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| CNU2007200074509U CN201051719Y (en) | 2007-06-26 | 2007-06-26 | Controllable digital high-voltage power supply for current conversion technology |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101742793B (en) * | 2009-12-25 | 2013-01-02 | 东文高压电源（天津）有限公司 | Special high-voltage power supply of zinc element hollow cathode lamp |
| CN102944259A (en) * | 2012-10-25 | 2013-02-27 | 天津大学 | Wireless passive measuring device |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| CN105932989A (en) * | 2016-03-23 | 2016-09-07 | 西安建筑科技大学 | Adjustable pulse signal generating device |
| CN106026698A (en) * | 2016-07-28 | 2016-10-12 | 钟燏 | Digital controlled switching power supply with adjustable voltage |
| CN106610685A (en) * | 2015-10-26 | 2017-05-03 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Method and device for adjusting output current of power source |
| CN108233749A (en) * | 2018-02-01 | 2018-06-29 | 昆明理工大学 | A kind of isolated adjustable three phase inverter |
| CN108282105A (en) * | 2017-12-27 | 2018-07-13 | 耿丙印 | RF ablation power supply |
| CN109687733A (en) * | 2017-10-19 | 2019-04-26 | 江苏扬航光电科技有限公司 | A kind of power supply unit for making alternating current be transformed into direct current |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101742793B (en) * | 2009-12-25 | 2013-01-02 | 东文高压电源（天津）有限公司 | Special high-voltage power supply of zinc element hollow cathode lamp |
| CN102944259A (en) * | 2012-10-25 | 2013-02-27 | 天津大学 | Wireless passive measuring device |
| CN102944259B (en) * | 2012-10-25 | 2015-05-20 | 天津大学 | Wireless passive measuring device |
| CN104167724A (en) * | 2014-09-08 | 2014-11-26 | 南京宁普防雷设备制造有限公司 | Isolating-type bidirectional communication signal lighting protection device |
| CN104167724B (en) * | 2014-09-08 | 2017-06-20 | 南京宁普防雷设备制造有限公司 | A kind of isolation type bidirectional signal of communication lightning protection device |
| CN106610685A (en) * | 2015-10-26 | 2017-05-03 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Method and device for adjusting output current of power source |
| CN105932989A (en) * | 2016-03-23 | 2016-09-07 | 西安建筑科技大学 | Adjustable pulse signal generating device |
| CN105932989B (en) * | 2016-03-23 | 2019-07-05 | 西安建筑科技大学 | A kind of adjustable pulse signal generation apparatus |
| CN106026698A (en) * | 2016-07-28 | 2016-10-12 | 钟燏 | Digital controlled switching power supply with adjustable voltage |
| CN109687733A (en) * | 2017-10-19 | 2019-04-26 | 江苏扬航光电科技有限公司 | A kind of power supply unit for making alternating current be transformed into direct current |
| CN108282105A (en) * | 2017-12-27 | 2018-07-13 | 耿丙印 | RF ablation power supply |
| CN108282105B (en) * | 2017-12-27 | 2019-12-24 | 耿丙印 | Radio frequency ablation power supply |
| CN108233749A (en) * | 2018-02-01 | 2018-06-29 | 昆明理工大学 | A kind of isolated adjustable three phase inverter |
| CN108233749B (en) * | 2018-02-01 | 2023-10-20 | 昆明理工大学 | Isolated adjustable three-phase inverter power supply |
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