CN209375463U - A kind of New single-phase sine wave variable-frequency variable-voltage power supply system - Google Patents
A kind of New single-phase sine wave variable-frequency variable-voltage power supply system Download PDFInfo
- Publication number
- CN209375463U CN209375463U CN201920280155.3U CN201920280155U CN209375463U CN 209375463 U CN209375463 U CN 209375463U CN 201920280155 U CN201920280155 U CN 201920280155U CN 209375463 U CN209375463 U CN 209375463U
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- power supply
- circuit
- bridge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Abstract
The utility model relates to power technique fields, more particularly to a kind of New single-phase sine wave variable-frequency variable-voltage power supply system, the system is using FGPA and single-chip microcontroller as control core, using based on half-bridge structure BOOST boost module and full-bridge inverting module as main circuit design made input 10-15V direct current, inversion exports 30-36V exchange, the Single-Phase Inverter Source of rated power 72W.Power-efficient is higher than 90%, and for load regulation less than 0.5%, output AC voltage virtual value 30-36V is adjustable, and frequency 20-100Hz stepping is adjustable.System generates PWM wave control BOOST booster circuit using FPGA, SPWM wave controls full-bridge circuit.This further includes voltage and current sampling module, auxiliary power module, protective module, Keysheet module, display module, has the function of input undervoltage overvoltage protection, output overcurrent protection, display input voltage, output voltage, frequency, electric current etc..
Description
Technical field
The utility model belongs to power technique fields more particularly to a kind of New single-phase sine wave variable-frequency variable-voltage power supply system
System.
Background technique
Mainly there are traditional type inverter and digital inverter on the market at present, traditional type inverter uses transformation
Device, circuit heaviness and low efficiency, output voltage is unstable, and without all kinds of safeguard measures, part number formula inverter can not be adjusted
Save frequency, can not monitoring and regulation output voltage, and it is expensive, it is therefore necessary to design it is a can input dc power, output
Offer high quality alternating current, high-efficient, noise is small, voltage is adjustable, frequency is adjustable, has all kinds of protections and self-recovering function, people
Good, the cheap middle low power sine-wave inverter of machine interaction.
Utility model content
The purpose of the utility model is to provide one kind to input for a certain range direct current, output offer high quality alternating current,
It is high-efficient, noise is small, voltage is adjustable, frequency is adjustable, have all kinds of protections and self-recovering function, the good medium and small function of human-computer interaction
Rate sine-wave inverter.
A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: New single-phase sine wave variable-frequency variable-voltage
Power-supply system, including based on half-bridge structure BOOST boost module, full-bridge inverting module, voltage and current sampling module, FPGA and
Single chip control module, auxiliary power module, protective module, Keysheet module, display module；Protective module, BOOST boosting mould
Block, full-bridge inverting module are sequentially connected as major loop；Voltage and current sampling module is to input terminal voltage and output end voltage electricity
Stream is sampled；FPGA and single chip control module are sampled with BOOST boost module, full-bridge inverting module, voltage and current respectively
Module is connected with protective module realizes circuit control, connect with Keysheet module and display module and realizes human-computer interaction；Accessory power supply
Module takes electricity from input terminal, voltage needed for each chip operation in generation system.
In above-mentioned New single-phase sine wave variable-frequency variable-voltage power supply system, the BOOST boosting based on half-bridge structure
Module includes the 1mH inductance that a magnetic core is EE55/28/25,3 bursts of 1.2mm diameter enameled wire coilings, a 10mF pressure resistance 100V
Electrolytic capacitor, the half-bridge driven chip of two switch mosfet pipe CSD19536 and one based on grid bootstrapping driving principle
UCC27211, FPGA and the adjustable PWM wave of duty ratio of single chip control module output control half-bridge driven chip.
In above-mentioned New single-phase sine wave variable-frequency variable-voltage power supply system, the full-bridge inverting module includes full-bridge circuit
With LC filter circuit；Full-bridge circuit includes that four switch mosfet pipes constitute full-bridge, two half-bridge drive circuit drivings；LC filtering
Circuit includes the 1mH inductance and 10 μ F CBB electric capacities that magnetic core is EE55/28/25,3 bursts of 1.2mm diameter enameled wire coilings, for filtering
The radio-frequency component for going full-bridge circuit to export.
In above-mentioned New single-phase sine wave variable-frequency variable-voltage power supply system, the voltage and current sampling module main body is mould
Number conversion circuit, chip TLC3578, reference voltage chip REF5040 and linear voltage regulator including ± 10V sample range
LM1117 samples input terminal DC voltage and output end alternating voltage, alternating current, and collected data are sent to
Control module is as electronic feedback；Wherein input terminal voltage is direct current, is sampled again after electric resistance partial pressure, output end voltage, electricity
Stream is exchange, respectively by there are two the amplifier chip OPA2227 of operational amplifier in mutual inductor TV1013, TA1015 and two
The mutual induction of voltage circuit and Current Mutual Inductance circuit built, then sampled.
In above-mentioned New single-phase sine wave variable-frequency variable-voltage power supply system, the protective module includes 5V supply relay
SRD-05VDC-SL-C, triode S9013, diode 1N4148 and light emitting diode 3RR4-Y-T；Relay is serially connected in system
The control terminal of input terminal, protective module is connected with FPGA and single chip control module.
In above-mentioned New single-phase sine wave variable-frequency variable-voltage power supply system, the FPGA and single chip control module include
Single-chip microcontroller MSP430F6638 is the FPGA development board of core with cyclone II；For receiving the output of voltage and current sampling module
Data, the frequency of duty ratio and SPWM wave to PWM wave is adjusted, and passes through control protective module and realizes circuit protection.
In above-mentioned New single-phase sine wave variable-frequency variable-voltage power supply system, the auxiliary power module is powered including+12V
Circuit ,+5V power supply circuit and -5V power supply circuit；Auxiliary power module takes electricity, input+5V power supply circuit from input terminal, and+12V is supplied
After circuit and -5V power supply circuit are attempted by+5V power supply circuit；+ 5V power supply circuit will be inputted using buck converter TPS5430
For voltage step-down to+5V DC voltage ,+5V voltage inversion is obtained -5V direct current using electric pressure converter LM2663 by -5V power supply circuit
Voltage ,+12V power supply circuit boost+5V using boost converter TPS61081 to obtain+12V DC voltage.
The utility model has the beneficial effects that having input adaptive, 10V-15V DC input voitage can be realized automatically
Stablize output.Output AC voltage virtual value 30-36V is adjustable, frequency 20-100Hz is adjustable, and precision is high.Stability is good, right
10-15V input and 30-36V output, system load regulation are respectively less than 0.5%.It is high-efficient, to 10-15V input and 30-36V
Output, when rated power, efficiency is all larger than 90%.Have the function of that Current Voltage is shown and overcurrent protection and under-voltage/over-voltage protection, people
Machine friendly interface.It is cheap, it is small in size.
Detailed description of the invention
Fig. 1 is the utility model one embodiment integrated circuit module frame chart；
Fig. 2 is BOOST boost module circuit diagram of the utility model one embodiment based on half-bridge structure；
Fig. 3 is the utility model one embodiment full-bridge inverting module circuit diagram；
Fig. 4-1 is the utility model one embodiment mutual induction of voltage circuit diagram, and Fig. 4-2 is the utility model one embodiment
Current Mutual Inductance circuit diagram, Fig. 4-3 are the utility model one embodiment analog to digital conversion circuit figures；
Fig. 5 is the utility model one embodiment protective module circuit diagram；
Fig. 6-1 is the utility model one embodiment+12V power supply circuit, and Fig. 6-2 is the utility model one embodiment
+ 5V power supply circuit, Fig. 6-3 are the utility model one embodiment-5V power supply circuits.
Specific embodiment
The embodiments of the present invention is described in detail with reference to the accompanying drawing.
As shown in Figure 1, a kind of New single-phase sine wave variable-frequency variable-voltage power supply system of the present embodiment, including it is based on half-bridge structure
BOOST boost module, full-bridge inverting module, voltage and current sampling module, FPGA and single chip control module, accessory power supply mould
Block, protective module, Keysheet module, display module.Protective module, BOOST boost module, full-bridge inverting module are sequentially connected conduct
Major loop, voltage and current sampling module sample input terminal DC voltage and output end alternating voltage electric current, FPGA and list
Piece machine control module connect respectively with BOOST boost module, full-bridge inverting module, voltage and current sampling module and protective module into
Row circuit control connect with Keysheet module and display module and carries out human-computer interaction, and auxiliary power module takes electricity from input terminal, generates
Voltage needed for each chip operation in system.
As shown in Fig. 2, two switch mosfet pipes select CSD19536 in the BOOST boost module based on half-bridge structure,
Two switching tubes constitute half-bridge structure, half-bridge driven chip of the switching tube driving selection based on grid bootstrapping driving principle
Main inductance selects EE55/28/25 magnetic core in UCC27211, BOOST topology, by the inductance of 3 bursts of 1.2mm diameter enameled wire coilings,
Main capacitance selects 100V pressure resistance 10mF electrolytic capacitor, the low side of switch half-bridge in BOOST topology in inductance value 1mH, BOOST topology
Switching tube realizes that the diode half-bridge high side switches pipe in topology is replaced to reduce circuit loss.Input voltage anode is through master
Inductance is connect with the drain electrode of the source electrode of high side switches pipe Q1, lower edge switch pipe Q2, and the source electrode ground connection of lower edge switch pipe Q2, flash is opened
The drain electrode for closing pipe Q1 is connect with 10mF main capacitance C1 anode, and main capacitance C1 cathode ground connection, main capacitance both end voltage is BOOST liter
The output voltage of die block.The end VSS of half-bridge driven chip UCC27211 is grounded, and VDD meets+12V in auxiliary power module and exports,
And decoupling capacitor decoupling is connect, two input port LI, HI receives two mirror images each other of FPGA and single chip control module output respectively
PWM wave, HB connect the both ends of 150nF bootstrap capacitor C2 with HS, and the tie point of the end HS connection Q1Q2, the end HO pass through driving electricity
Resistance is connect with the grid of high side switches pipe Q1, and the end LO drives resistance by driving resistance to connect with the grid of lower edge switch pipe Q2
Equal parallel diode, to shorten the switching tube shut-in time.It is connect between high side switches pipe Q1 and the grid source electrode of lower edge switch pipe Q2
Bleeder resistance.
As shown in figure 3, full-bridge inverting module is made of full-bridge circuit and LC filter circuit.Full-bridge circuit is mainly driven by half-bridge
Dynamic chip UCC27211U1, U2, the first half-bridge high side switches pipe CSD19536Q1, the first half-bridge lower edge switch pipe
CSD19536Q2, the second half-bridge high side switches pipe CSD19536Q3, the second half-bridge high side switches pipe CSD19536Q4 are constituted；LC filter
Wave circuit is by EE55/28/25 magnetic core the 1mH inductance L1 and 10 μ F CBB electric capacity C1 structures of 3 bursts of 1.2mm diameter enameled wire coilings
At.BOOST boost module direct current output anode connection Q1 and Q3 drain electrode, the ground of the direct current output of BOOST boost module and
Q2 is connected with the source electrode of Q4, and the source electrode of Q1 is connected with the drain electrode of Q2, and the inductance connection with the end U1HS, LC filter circuit, Q3's
Source electrode is connected with the drain electrode of Q4, and the capacitance connection with the end U2HS, LC filter circuit.The vdd terminal of U1 and U2 is and accessory power supply
+ 12V output connection in module, the end VSS ground connection, the LI of the HI and U2 of U1 meet the same SPWM wave control signal, the LI and U2 of U1
HI connect the SPWM wave control signal of another mirror image, the HB and HS of U1, U2 are separately connected the both ends of bootstrap capacitor, the HO of U1
It is connect by driving resistance with Q1 grid, for the LO of U1 by driving resistance to connect with Q2, the HO of U2 passes through driving resistance and Q3 grid
Pole connection, the LO of U2 drive resistance and diodes in parallel by driving resistance to connect with Q4.The grid source electrode of Q1, Q2, Q3, Q4
Connect bleeder resistance.
As shown in Fig. 4-1,4-2,4-3, voltage and current sampling module includes mutual induction of voltage circuit, Current Mutual Inductance circuit and mould
Number conversion circuit carries out sampled measurements to input voltage, output voltage, output electric current.+ the 5V, -5V of auxiliary power module output
Voltage indicates corresponding voltage value into figure through 10uF tantalum capacitor, 0.1uF patch capacitor parallel connection decoupled and powers everywhere to chip.
Input voltage is direct current, carries out analog-to-digital conversion with modulus conversion chip TLC3578 after electric resistance partial pressure；Output voltage electric current is to hand over
Stream, respectively after output voltage electric current is converted into weak electric signal by mutual induction of voltage circuit and Current Mutual Inductance circuit, uses analog-to-digital conversion
Chip TLC3578 samples waveform.Mutual induction of voltage circuit includes mutual inductor TV1013-1H and interior there are two operational amplifier
Amplifier chip OPA2227.Output voltage is input to the amplifier that amplifier chip OPA2227U4 is built through mutual inductor TV1013-1H
Circuit and three rank filter circuits obtain the sampled voltage of output voltage.Current Mutual Inductance circuit is input to fortune through mutual inductor TA1015-2
It puts operational amplifier circuit that chip OPA2227U5 is built and three rank filter circuits obtains the sampled voltage of output electric current.Analog-to-digital conversion electricity
Road includes 14,8 channel low-power consumption modulus conversion chip TLC3578U1, reference voltage chip REF5040U2 and linear voltage regulator
LM1117U3.Reference voltage chip provides the reference voltage of the low drift 4.096V of high-precision low noise, linear voltage regulator offer+3.3V electricity
Pressure.SCLK, SDI, EOC, SDO, CS pin of modulus conversion chip LTC3578 passes through 10 Ω resistance and FPGA and single-chip microcontroller control
The connection of molding block I/O port, FS and CSTART pin set height through 10K Ω current-limiting resistance by+3.3V supply voltage, and COMP pin connects
0.1uF capacitor is to simulation ground, and with connecing simulation, REFP pin meets the 4.096V of reference voltage chip REF5040 output to REFM pin
Reference voltage, sampled voltage input through 100 Ω resistance and 10uF capacitor low pass wave incoming analog signal input pin.
Further, FPGA and single chip control module include single-chip microcontroller MSP430F6638, are core with cyclone II
FPGA development board；For receiving the data of voltage and current sampling module output, input voltage is calculated and output electric current is effective
Value is the no deficient over-voltage of input to input voltage judgement, to output current effective value judge to export whether overcurrent, if there is exception
Situation is adjusted by the frequency of duty ratio and SPWM wave to PWM wave, starting protection module, output high level to protection mould
Block makes the input of major loop anode disconnect realization circuit protection.
Further, the voltage effective value and frequency of 4*4 matrix keyboard input requirements, FPGA and single chip control module pass through
The virtual value that output voltage is calculated in output voltage sampling is compared with setting value, is given using pid algorithm adjustment output
The PWM wave of BOOST booster circuit makes output voltage stabilization in desired voltage effective value.FPGA and single chip control module according to
According to setpoint frequency setting output to the frequency of the SPWM wave of full bridge inverter, the frequency for requiring output signal.And it will
The information such as input voltage, output voltage, electric current, frequency show that on the lcd screen, human-computer interaction is good.
As shown in figure 5, protective module use relay SRD-05VDC-SL-C, one of FPGA and single chip control module
I/O mouthfuls of output voltages control voltage as Vcon, control triode S9013 by I/O mouthfuls of output high level and drive relay disconnected
Input anode is opened, realizes overcurrent protection.
As shown in Fig. 6-1,6-2,6-3, auxiliary power module includes+12V power supply circuit ,+5V power supply circuit ,-5V power supply
Circuit.Auxiliary power module takes electricity, input+5V power supply circuit from input terminal, and+12V power supply circuit and -5V power supply circuit are attempted by
After+5V power supply circuit.Input voltage is depressured to+5V DC voltage, -5V using buck converter TPS5430 by+5V power supply circuit
+ 5V voltage inversion is obtained -5V DC voltage using electric pressure converter LM2663 by power supply circuit, and+12V power supply circuit utilizes boosting
Converter TPS61081 boosts to obtain
+ 12V DC voltage.+ 12V DC voltage is given to three driving chip UCC27211 power supplies ,+5V DC voltage
FPGA, single-chip microcontroller, modulus conversion chip TLC3578, reference voltage chip REF5040, linear regulator chip LM1117, amplifier core
Piece OPA2227, relay power supply, -5V DC voltage is to OPA2227 for negative voltage.
It should be understood that the part that this specification does not elaborate belongs to the prior art.
Although being described in conjunction with the accompanying specific embodiment of the present utility model above, those of ordinary skill in the art
It should be appreciated that these are merely examples, various deformation or modification can be made to these embodiments, it is practical without departing from this
Novel principle and essence.The scope of the utility model is only limited by the claims that follow.
Claims (7)
1. a kind of New single-phase sine wave variable-frequency variable-voltage power supply system, characterized in that including the BOOST boosting based on half-bridge structure
Module, full-bridge inverting module, voltage and current sampling module, FPGA and single chip control module, auxiliary power module, protection mould
Block, Keysheet module, display module；Protective module, BOOST boost module, full-bridge inverting module are sequentially connected as major loop；Electricity
Current voltage sampling module samples input terminal voltage and output end voltage electric current；FPGA and single chip control module respectively with
BOOST boost module, full-bridge inverting module, voltage and current sampling module are connected with protective module realizes circuit control, with keyboard
Module is connected with display module realizes human-computer interaction；Auxiliary power module takes electricity, each chip operation in generation system from input terminal
Required voltage.
2. New single-phase sine wave variable-frequency variable-voltage power supply system as described in claim 1, characterized in that described to be based on half-bridge knot
The BOOST boost module of structure includes the 1mH inductance that a magnetic core is EE55/28/25,3 bursts of 1.2mm diameter enameled wire coilings, and one
The electrolytic capacitor of a 10mF pressure resistance 100V, two switch mosfet pipe CSD19536 and one are based on grid bootstrapping driving principle
Half-bridge driven chip UCC27211, FPGA and the adjustable PWM wave of duty ratio of single chip control module output control half-bridge driven
Chip.
3. New single-phase sine wave variable-frequency variable-voltage power supply system as described in claim 1, characterized in that the full-bridge inverting mould
Block includes full-bridge circuit and LC filter circuit；Full-bridge circuit includes that four switch mosfet pipes constitute full-bridge, two half-bridge drivens
Circuit drives；LC filter circuit includes the 1mH inductance and 10 μ F that magnetic core is EE55/28/25,3 bursts of 1.2mm diameter enameled wire coilings
CBB electric capacity, for filtering off the radio-frequency component of full-bridge circuit output.
4. New single-phase sine wave variable-frequency variable-voltage power supply system as described in claim 1, characterized in that the voltage and current is adopted
Original mold block main body is analog to digital conversion circuit, chip TLC3578, reference voltage chip REF5040 including ± 10V sample range and
Linear voltage regulator LM1117 samples input terminal DC voltage and output end alternating voltage, alternating current, will be collected
Data are sent to control module as electronic feedback；Wherein input terminal voltage is direct current, is sampled again after electric resistance partial pressure, is exported
Holding voltage, electric current is exchange, respectively by there are two the amplifier cores of operational amplifier in mutual inductor TV1013, TA1015 and two
The mutual induction of voltage circuit and Current Mutual Inductance circuit that piece OPA2227 is built, then sampled.
5. New single-phase sine wave variable-frequency variable-voltage power supply system as described in claim 1, characterized in that the protective module packet
Include 5V supply relay SRD-05VDC-SL-C, triode S9013, diode 1N4148 and light emitting diode 3RR4-Y-T；After
Electric appliance is serially connected in system input, and the control terminal of protective module is connected with FPGA and single chip control module.
6. New single-phase sine wave variable-frequency variable-voltage power supply system as claimed in claim 2, characterized in that the FPGA and monolithic
Machine control module includes single-chip microcontroller MSP430F6638, is the FPGA development board of core with cyclone II；For receiving voltage electricity
The data of sampling module output are flowed, the frequency of duty ratio and SPWM wave to PWM wave is adjusted, real by control protective module
Existing circuit protection.
7. New single-phase sine wave variable-frequency variable-voltage power supply system as claimed in claim 2, characterized in that the accessory power supply mould
Block includes+12V power supply circuit ,+5V power supply circuit and -5V power supply circuit；Auxiliary power module takes electricity, input+5V from input terminal
After power supply circuit ,+12V power supply circuit and -5V power supply circuit are attempted by+5V power supply circuit；+ 5V power supply circuit utilizes decompression conversion
Input voltage is depressured to+5V DC voltage by device TPS5430, and -5V power supply circuit utilizes electric pressure converter LM2663 by+5V voltage
Reverse phase obtains -5V DC voltage, and+12V power supply circuit boosts+5V using boost converter TPS61081 to obtain+12V DC electricity
Pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920280155.3U CN209375463U (en) | 2019-03-06 | 2019-03-06 | A kind of New single-phase sine wave variable-frequency variable-voltage power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920280155.3U CN209375463U (en) | 2019-03-06 | 2019-03-06 | A kind of New single-phase sine wave variable-frequency variable-voltage power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209375463U true CN209375463U (en) | 2019-09-10 |
Family
ID=67823657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920280155.3U Expired - Fee Related CN209375463U (en) | 2019-03-06 | 2019-03-06 | A kind of New single-phase sine wave variable-frequency variable-voltage power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209375463U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116073500A (en) * | 2023-04-04 | 2023-05-05 | 齐鲁工业大学(山东省科学院) | Super capacitor charge and discharge control system and control method for robot |
| CN116317032A (en) * | 2023-05-17 | 2023-06-23 | 中国人民解放军国防科技大学 | Faraday capacitor electric energy constant power storage and release control method |
-
2019
- 2019-03-06 CN CN201920280155.3U patent/CN209375463U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116073500A (en) * | 2023-04-04 | 2023-05-05 | 齐鲁工业大学(山东省科学院) | Super capacitor charge and discharge control system and control method for robot |
| CN116317032A (en) * | 2023-05-17 | 2023-06-23 | 中国人民解放军国防科技大学 | Faraday capacitor electric energy constant power storage and release control method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105099188B (en) | Dc-dc converter | |
| CN105932880A (en) | Magnetizing Current Based Control Of Resonant Converters | |
| CN106533152B (en) | A kind of device and method improving Boost three-level converter PF | |
| CN106936319A (en) | A kind of two-way DC DC converters in the port of isolated form three | |
| CN104104248A (en) | Dual-power photovoltaic inverter and control method thereof | |
| CN209375463U (en) | A kind of New single-phase sine wave variable-frequency variable-voltage power supply system | |
| CN102148566B (en) | Boost-type voltage balance converter | |
| CN110165888A (en) | Three level Boost circuits, multiple-channel output parallel system | |
| TWI382640B (en) | Global switched power supply and its serial - to - parallel DC - to - DC power conversion circuit | |
| CN109120153A (en) | A kind of BUCK circuit and Switching Power Supply | |
| CN209030101U (en) | A kind of energy back feed device based on Boost flyback booster circuit | |
| CN109672339A (en) | A kind of multi-channel digital power supply | |
| CN206099788U (en) | Novel sinusoidal invertion power supply system of full -bridge | |
| CN207732643U (en) | Boost DC switching power supply | |
| CN107395015A (en) | A kind of low ripple Sofe Switch synchronous rectification Buck converters based on coupling inductance | |
| CN106329909A (en) | Push-pull soft switching control circuit | |
| CN207664872U (en) | A kind of novel wide scope input power translation circuit | |
| CN109617407A (en) | A kind of series-parallel complex resonance Switching capacitors of boost type | |
| CN107885128A (en) | The high-power resistive load of continuously adjustabe based on alternating expression PWM | |
| CN207896874U (en) | Expansible parallel operation DC-DC power source device | |
| CN209029928U (en) | A kind of energy back feed device in current transformer load test | |
| CN208112510U (en) | A kind of constant voltage outputting circuit of twin-stage input inverter | |
| CN206196097U (en) | Lighting device , control chip and linear dimming system | |
| CN206099812U (en) | Single -phase sinusoidal wave variable frequency power supply system | |
| CN201910738U (en) | Voltage balance circuit and boost regulation circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20190910 Termination date: 20200306 |