CN101860017B - Control device for high-voltage and high-power power electronic converter system - Google Patents
Control device for high-voltage and high-power power electronic converter system Download PDFInfo
- Publication number
- CN101860017B CN101860017B CN 201010172132 CN201010172132A CN101860017B CN 101860017 B CN101860017 B CN 101860017B CN 201010172132 CN201010172132 CN 201010172132 CN 201010172132 A CN201010172132 A CN 201010172132A CN 101860017 B CN101860017 B CN 101860017B
- Authority
- CN
- China
- Prior art keywords
- chip
- voltage
- circuit
- pin
- signal
- 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.)
- Active
Links
Images
Abstract
The invention discloses a control device for a high-voltage and high-power power electronic converter system, which comprises a detecting and protecting circuit (1), an optical fiber drive circuit (2) and an isolating power supply circuit (3). A programmable logic device (CPLD) controls the sampling of analogue-to-digital conversion (AD) and data of sampling and protective information are transmitted to a main control panel by using an optical transmitter in the optical fiber drive circuit (2). The acquired data are transmitted to the main control panel to participate in controlling and a fault signal is transmitted to an upper machine simultaneously by using transmitting optical fibers in the optical fiber drive circuit (2). The isolating power supply circuit (3) acquires power from a high-voltage fence through a transformer, passes through a voltage-type rectifier and provides a stable direct current voltage for an isolating buck converter, so that the control device acquires an isolated direct current power supply which is supplied to an external sensor (4) and the control device for use. In a high-voltage system, the electrical isolation can be realized.
Description
Technical field
The present invention relates to a kind of control device for high-voltage and high-power power electronic converter system, particularly signal isolation transmission device and insulating power supply in a kind of high-pressure system.
Background technology
Along with the continuous development of high-voltage and high-power power electronic device, the detection of signal must be isolated transmission, in order to avoid be interfered, also is a kind of requirement of security of system simultaneously.In case the fault that system's main circuit partly takes place will produce the protection action timely, fault message will be sent to host computer simultaneously and show, make things convenient for fault to judge and processing.Such as in high-voltage and high-power power electronic converter system, the main circuit topology of employing mainly contains: diode clamp formula multi-level converter, striding capacitance formula multi-level converter, Cascade H bridge type converter and modular multilevel transformer configuration.The present invention be directed to the control device of a kind of high-tension electricity electronic system of modular multilevel transformer configuration design.
In the present existing similar device, all carry out at certain part of functions, the driving circuit device at device for high-power power electronic is arranged specially, but so also want the independent outer power supply of joining, system can not realize modularized design; Also have the control supply unit of using at the high-power electric and electronic system specially, diverse ways is arranged, but the systematic comparison dispersion, reliability reduces, and anti-interference is undesirable.This device uses in the high-voltage and high-power power electronic system, and at modular system, with driving, the protection of high-power electronic device, the isolation detection of signal and transmission and power-supply system integrate, and reliability improves, compact conformation, strong interference immunity.
Chinese patent 200520093324.0 mainly is the drive circuit of an IGBT device, utilize a collector electrode complementary push-pull power amplification analog circuit as the driving of IGBT, circuit is simple, but system is subjected to the influence of transistor characteristic bigger, select the transistor of characterisitic parameter unanimity as far as possible for use, so just increased the unreliability of system, and the power supply of drive circuit needs the outside to provide separately, in large-power occasions, generally all need isolation drive, this circuit also needs external optical fiber to drive, like this more complicated of system with regard to becoming.We directly adopt existing driving chip, add optical fiber interface, make entire system more reliable, are fit to the high-power system and use.
Chinese patent 200710121174.3 relates to a kind of voltage-current sensor that is applied to electric power system, is directly to obtain signal on current signal and the resistance from conductor, passes the signal to computer supervisory control system through frequency-conversion circuit.Direct like this power taking from the conductor in the high-power system, is subjected to electromagnetic interference easily, causes the inaccurate of input, also may can not directly obtain signal from conductor in other high-pressure systems.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of existing modular multilevel converter, as the control device function singleness, realize that the control of system needs a lot of different devices to unite use.In the high-power system, the connection between the different device is easy to be subjected to outside electromagnetic interference, and the connection of a plurality of device, can cause the whole system complex structure, increases the unreliability of system, is not easy to modularized design.The present invention combines driving and the control power supply of the input of high-voltage and high-power power electronic converter system, defencive function, power device, realize isolation and reliable transmission of signal simultaneously, and the control power supply is realized isolating.The present invention is applicable to the high-power occasion.
The present invention includes detection and protective circuit, optical fiber driving circuit and insulating power supply circuit.
Described detection and protective circuit comprise testing circuit and protective circuit.Described testing circuit is made up of a slice modulus conversion chip and a slice programmable logic device chip.Control the work of modulus conversion chip by programmable logic device, by parallel data line, sampled data is write the programmable logic device chip.Modulus conversion chip is selected parallel conversion chip for use, to realize the quick conversion of data.In order to reach the isolation on electric, image data transfers data to host computer by optical fiber.Namely carry out the parallel-to-serial conversion of image data in programmable logic device, transmission rate as required and respective transmissions agreement send data by optical fiber again.
Protective circuit in described detection and the protective circuit will be installed in the signal of the voltage sensor output on the high-voltage and high-power power electronic converter system radiator and protect threshold ratio; obtain fault-signal; block the trigger impulse of high-power insulated gate bipolar transistor IGBT in the main circuit of high-voltage and high-power power electronic converter system rapidly with this fault-signal; protect high-power edge grid bipolar transistor IGBT not to be damaged; simultaneously fault-signal is delivered in the programmable logic device; signal with sampling sends to host computer, realizes fault alarm; the storage of demonstration and fault.Protective circuit is made of a comparison circuit; the outside analog sampling voltage signal that inserts of described control device is connected to the anode input port of comparator; the negative terminal input port of comparator connects the voltage signal of a fixed voltage value of protection threshold value requirement; when the analog sampling voltage signal values greater than the protection threshold value; comparator just overturns; the output high level; this high level signal and driving signal are passed through one and door combination; the pulse width modulated wave that drives insulated gate bipolar transistor in the main circuit is blocked; simultaneously this level signal is connected to input/output port of programmable logic device (CPLD); deliver to host computer by optical fiber, produce alarm prompt.
The power supply of described insulating power supply circuit is independently, High-Voltage Insulation simultaneously.The present invention adopts independently power supply design, by the high-voltage fence power taking, through the transformer step-down, realize electric high pressure isolation, by a voltage-type Switching Power Supply, produce a stable VD then, offer the isolated form decompression converter circuit among the present invention, produce and independently control power supply to the use of the circuit in the device, return transducer simultaneously power supply is provided, control power supply reliably working.
The control power supply that the optical fiber interface of signals collecting that the present invention is integrated, protection, main circuit power device drives and isolates is realized modularized design, compact conformation, signal strong interference immunity, reliability height.
The present invention has following characteristics:
1. can realize fast, reliably gathering and isolating transmission of high voltage occasion signal;
2. to the analog signal of transducer input, directly handle, compare, obtain the protection enable signal, directly remove to block the driving signal of power device, play the effect of protection rapidly, by optical fiber fault-signal is sent to host computer simultaneously, carry out demonstration and the storage of fault, be convenient to maintenance and the maintenance of system;
3. equipment is integrated control power circuit has been realized electrical isolation, control system modularized design, good reliability.
4. can realize some function of electronic circuit by programming, realize Digital Control, make device reliability higher, integrated level is stronger.
Description of drawings
Fig. 1 structured flowchart of the present invention;
Fig. 2 is input and protective circuit;
Fig. 3 is the insulating power supply circuit;
Fig. 4 is optical fiber driving circuit.
Embodiment
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Show as Fig. 1, the present invention includes detection and protective circuit, insulating power supply circuit and optical fiber driving circuit.Detection and protective circuit comprise testing circuit and protective circuit.Described testing circuit is made up of analog-to-digital conversion sampling A AD and programmable logic device (CPLD).
The insulating power supply circuit adopts an isolated form decompression converter circuit to produce a galvanic current to press among the present invention, the circuit supply in the present invention.Testing circuit receives outside analog signal, realizes data transaction, by fiber optic circuit information is sent out; Protective circuit is used outside analog signal; compare; produce one for the protection of level signal; realize hardware protection; simultaneously this level signal is input in the programmable logic device (CPLD) of testing circuit; form a packet, be sent to host computer by the transmission optical fiber in the power device optical fiber driving circuit.
As shown in Figure 2, in testing circuit, outside analog signal is connected to the analog signal input pin of AD chip, and the output port of CPLD links to each other with the pin that enables of AD chip, starts AD and carries out analog-to-digital conversion.The data wire of AD chip is connected with input port, the output port of CPLD chip respectively with address wire, realizes that parallel data transmits.The AD chip convert another input port that signal is connected to the CPLD chip, the convert signal judgment of CPLD chip by the AD chip is sent carried out the read data operation.The AD chip receive the amplitude that is installed in the output of voltage sensor on the high-voltage and high-power power electronic converter system radiator for+5V and-analog voltage signal between the 5V, this analog voltage signal is input to the input port of AD chip, send control command by programmable logic device (CPLD), start modulus conversion chip AD and carry out analog-to-digital conversion.
The present invention selects the modulus conversion chip AD of parallel data acquisition for use, by programmable logic device (CPLD) the data transaction that modulus conversion chip AD gathers is become serial data.Carry out exchanges data by data wire between modulus conversion chip AD and the programmable logic device (CPLD), data realize parallel-to-serial conversion in programmable logic device (CPLD).Realize the agreement that serial data sends by programming, by the delivery outlet of programmable logic device (CPLD), be sent to the optical fiber interface of optical fiber driving circuit, by sending optical fiber data are sent to host computer, through data check, finish collection, transmission and the receiving course of data.
Protective circuit as shown in Figure 2 comprises that voltage reference produces circuit and comparison circuit.Voltage reference produces the reference voltage source LM336 chip that circuit adopts a 3.6V.2 pin of LM336 chip by the pull-up resistor of a 5k receive+the 15V power supply on, 1 pin of LM336 chip connects simulation ground, reference voltage of 3 pin output of LM336 chip is as the protection threshold voltage.Through capacitor filtering, this benchmark simulation voltage signal is transferred to 5 pin of comparator LM339 chip, 4 pin of LM339 chip receive the analog signal that the external sensor transmission comes, 3 pin of LM339 chip are power end, 12 pin of LM339 chip are earth terminal, and 2 pin of LM339 chip are output, from level signal of 2 pin output of LM339 chip, this level signal is fault-signal: low level is unfaulty conditions, and high level is for there being malfunction.2 pin of LM339 chip are connected to an input port of CPLD chip, this level signal as control signal, is produced with master controller Digital Signal Processing dsp chip, and the pulse-width modulation PWM signal that sends out by optical fiber makes up, in case high level occurs, just expression is broken down.The pulse-width modulation PWM signal is received a port of CPLD chip; in the CPLD chip, pulse-width modulation PWM signal and fault-signal are made up with a logic OR not gate; in case fault-signal is high level; the driving signal that will be transferred to the power device gate pole in the main circuit of high-voltage and high-power power electronic converter system immediately becomes low level; can't the conducting power device; guarantee can not cause the misoperation of power device, reach hardware protection function fast.Also by the transmission optical fiber of optical fiber driving circuit, fault message is sent to host computer simultaneously, show and the fault storage, be conducive to maintenance and the maintenance of system.
In the high-power system, the topology of main circuit is selected, and determined to adopt multilevel hierarchy, and the control power supply between each grade must be independent and isolate mutually.The present invention obtains low-voltage AC by AC transformer from high-voltage fence.Described AC transformer plays the effect of step-down and electrical isolation.Utilize the low-voltage AC of described AC transformer output, give an outside voltage-type Switching Power Supply power supply, the output galvanic current is pressed, for providing galvanic current, the insulating power supply in the control device presses, by the isolated form buck converter, realize the direct current output of different electric pressures, offer control device and use, also provide power supply for sensor external simultaneously.Each level has an independently power supply like this, simultaneously, also can realize the exploitation of modular in the design.
Figure 3 shows that the insulating power supply circuit.The insulating power supply circuit adopts isolated form voltage-dropping type circuit topology, is input as+the 30V direct current.Transformer fe in the insulating power supply circuit has three windings in the heart: winding N1, a secondary winding N3 and magnetic-reset winding N2.Stain is represented the end of the same name of three winding induced electromotive forces.Among Fig. 3 in the black surround is the insulating power supply circuit, outside input+the 30V DC power supply connects the end of the same name of a winding N1 and the negative electrode of diode D1, the non-same polarity of a winding N1 is connected to the drain electrode of field effect transistor M OSFET, the source electrode of field effect transistor M OSFET is connected to the ground end of external dc power, the anode of diode D1 is connected to the non-same polarity of secondary winding N2, the end of the same name of secondary winding N2 is held with being connected to, the end of the same name of three winding N3 is connected to the anode of diode D2, the non-same polarity of three winding N3 is received simulation ground, the negative electrode of diode D2 is connected to the negative electrode of diode D3, the anode of diode D3 is received simulation ground, diode D2, the negative electrode of D3 is connected to the end of filter inductance L, the other end of filter inductance L is received an end of filter capacitor, the other end of filter capacitor is received simulation ground, and the two ends of filter capacitor are the output of insulating power supply.Switch S 1 controlled square wave triggers, periodic conducting, disconnection.When the S1 conducting, input 30V supply voltage is added on winding N1, by linear rising of winding N1 winding current, transformer flux is linear to be increased, and the induced electromotive force of a winding N1 and three winding N3 all greater than zero, makes diode D2 conducting, diode D3 ends, the meritorious output of power supply.Simultaneously, the induced electromotive force of secondary winding N2 ends diode D1 greater than zero.When switch S 1 was turn-offed, transformer flux reduced, and at this moment the induced potential of three windings of transformer is all reverse, diode D2 is ended, and load current is through diode D3 afterflow, diode D3 conducting, diode D1 conducting, with the magnetic energy feedback that voltage device exciting current produces, transformer flux reduces.
Optical fiber driving circuit as shown in Figure 4.Optical fiber is to use in pairs, the optical fiber of reception is arranged and send optical fiber.An I/O port of CPLD chip is connected to 2 pin of AND SN7451 chip, 3 pin of SN7451 chip are connected to 1 pin of the fiber optic transmitter HFBR-1521 device among Fig. 4, convert the electrical signal to light signal by fiber optic transmitter HFBR-1521 device, send out through sending optical fiber; Fiber optic receiver HFBR-2521 device is transformed into the signal of telecommunication with the light signal that receives, and by the 1 pin output of fiber optic receiver HFBR-2521 device, 1 pin of fiber optic receiver HFBR-2521 device connects pull-up resistor.2 pin of fiber optic receiver HFBR-2521 device connect digitally, and 3 pin of fiber optic receiver HFBR-2521 device connect digitally by electric capacity.
The present invention is applied in the modular multilevel changer system in the subelement.The topological structure of modular multilevel converter can be according to different electric pressures and power requirement, is made of the IGBT modular unit of varying number, and each IGBT modular unit independently uses a control device of the present invention.Detection and protective circuit are by detecting the voltage at electric capacity two ends in the IGBT modular unit, and sampled data is sent to host computer by optical fiber, plays the effect of hardware protection simultaneously.The insulating power supply circuit provides stable control power supply to use for the present invention and external sensor.Optical fiber driving circuit is realized the isolation transmission of data.
Claims (5)
1. control device that high-voltage and high-power power electronic converter system is used is characterized in that: described control device comprises and detects and protective circuit (1) optical fiber driving circuit (2) and insulating power supply circuit (3); Described detection and protective circuit (1) comprise testing circuit and protective circuit; Described testing circuit is made of analog-to-digital conversion AD chip and programmable logic device (CPLD) chip, the sampling of programmable logic device (CPLD) control analog-to-digital conversion AD, data are existed in the programmable logic device (CPLD), will sample and protect information data to be sent to the master control borad of host computer by the fiber optic transmitter in the optical fiber driving circuit (2); Described protective circuit is made of a comparison circuit, the outside analog sampling voltage signal that inserts of described control device is connected to the anode input port of comparator, the negative terminal input port of comparator connects the voltage signal of a fixed voltage value, when the analog sampling voltage signal values greater than the protection threshold value, comparator just overturns, the output high level, this high level signal and driving signal are passed through one and door combination, the pulse width modulated wave that drives insulated gate bipolar transistor in the main circuit is blocked, simultaneously this level signal is connected to I/O port of programmable logic device (CPLD), deliver to host computer by optical fiber, produce alarm prompt; Described optical fiber driving circuit (2) is made of optical fiber driving circuit, transmission optical fiber and reception optical fiber; Send optical fiber the data that collect are sent to the master board of host computer and participate in control, also fault-signal is sent to host computer simultaneously; Insulating power supply circuit (3) passes through the transformer power taking from high-voltage fence, through the voltage-type rectifier, for providing a galvanic current, the isolated form buck converter presses, make described control device obtain the DC power supply of isolating, offering sensor external (4) and described control device uses, in high-pressure system, realize electric isolation.
2. the control device used of high-voltage and high-power power electronic converter system as claimed in claim 1, it is characterized in that in the described signal deteching circuit, outside analog signal is connected to the analog signal input pin of analog-to-digital conversion AD chip, and an output port of programmable logic device (CPLD) links to each other with the pin that enables of analog-to-digital conversion AD chip; The data wire of analog-to-digital conversion AD chip is connected with input port, the output port of programmable logic device (CPLD) chip respectively with address wire; Analog-to-digital conversion AD chip convert another input port that signal is sent to the programmable logic device (CPLD) chip, the convert signal judgment of programmable logic device (CPLD) chip by analog-to-digital conversion AD chip is sent carried out the read data operation; Analog-to-digital conversion AD chip receive the amplitude that is installed in the output of voltage sensor on the described high-voltage and high-power power electronic converter system radiator for+5V and-analog voltage signal between the 5V, this analog voltage signal is input to the input port of analog-to-digital conversion AD chip, send control command by programmable logic device (CPLD), start analog-to-digital conversion AD chip and carry out analog-to-digital conversion.
3. the control device used of high-voltage and high-power power electronic converter system as claimed in claim 1 is characterized in that described protective circuit comprises that voltage reference produces circuit and comparison circuit; Voltage reference produces the reference voltage source LM336 chip that circuit adopts a 3.6V; 2 pin of LM336 chip by the pull-up resistor of a 5k receive+the 15V power supply on; 1 pin of LM336 chip connects simulation ground; reference voltage of 3 pin output of LM336 chip; as the protection threshold voltage; this benchmark simulation voltage signal is through capacitor filtering; be transferred to 5 pin of comparator LM339 chip; 4 pin of LM339 chip receive the analog signal that the external sensor transmission comes; 3 pin of LM339 chip are power end; 12 pin of LM339 chip are earth terminal; 2 pin of LM339 chip are output, and 2 pin of LM339 chip are connected to an input port of CPLD chip.
4. the control device used of high-voltage and high-power power electronic converter system as claimed in claim 1, it is characterized in that in the described insulating power supply circuit (3), outside input+the 30V DC power supply connects the end of the same name of a winding N1 of isolating transformer and the negative electrode of diode D1, and the non-same polarity of a winding N1 is connected to the drain electrode of field effect transistor M OSFET; The source electrode of field effect transistor M OSFET is connected to the ground end of external dc power, and the anode of diode D1 is connected to the non-same polarity of isolating transformer secondary winding N2, and the end of the same name of secondary winding N2 is held with being connected to; The end of the same name of three winding N3 of isolating transformer is connected to the anode of diode D2, and the non-same polarity of three winding N3 of isolating transformer is received simulation ground; The negative electrode of diode D2 is connected to the negative electrode of diode D3, the anode of diode D3 is received simulation ground, the negative electrode of diode D2 and diode D3 is connected to the end of filter inductance L, the other end of filter inductance L is received an end of filter capacitor, the other end of filter capacitor is received simulation ground, and the two ends of filter capacitor are the output of insulating power supply.
5. the control device used of high-voltage and high-power power electronic converter system as claimed in claim 1, it is characterized in that in the described optical fiber driving circuit (2), an I/O port of programmable logic device (CPLD) chip is connected to 2 pin of AND SN7451 chip, 3 pin of SN7451 chip are connected to 1 pin of fiber optic transmitter HFBR-1521 device, fiber optic receiver HFBR-2521 device is transformed into the signal of telecommunication with the light signal that receives, by the 1 pin output of fiber optic receiver HFBR-2521 device, 1 pin of fiber optic receiver HFBR-2521 device connects pull-up resistor; 2 pin of fiber optic receiver HFBR-2521 device connect digitally, and 3 pin of fiber optic receiver HFBR-2521 device connect digitally by electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010172132 CN101860017B (en) | 2010-05-07 | 2010-05-07 | Control device for high-voltage and high-power power electronic converter system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010172132 CN101860017B (en) | 2010-05-07 | 2010-05-07 | Control device for high-voltage and high-power power electronic converter system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101860017A CN101860017A (en) | 2010-10-13 |
| CN101860017B true CN101860017B (en) | 2013-08-21 |
Family
ID=42945742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010172132 Active CN101860017B (en) | 2010-05-07 | 2010-05-07 | Control device for high-voltage and high-power power electronic converter system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101860017B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660369A (en) * | 2013-11-25 | 2015-05-27 | 北京卓越信通电子股份有限公司 | Method for velocity self-adaption of industrial serial port optical fiber transceiver |
| CN111313666B (en) * | 2019-10-18 | 2021-10-22 | 苏州浪潮智能科技有限公司 | High-reliability control device and system of high-power output channel |
| CN112003479B (en) * | 2020-09-01 | 2021-07-30 | 中车青岛四方车辆研究所有限公司 | Digital quantity acquisition circuit and acquisition method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5258758A (en) * | 1991-01-31 | 1993-11-02 | Crystal Semiconductor Corporation | DAC shutdown for low power supply condition |
| CN2836340Y (en) * | 2005-11-02 | 2006-11-08 | 张继科 | IGBT module drive circuit |
| CN101109771A (en) * | 2007-08-31 | 2008-01-23 | 清华大学 | Analog signal separating and transferring system used for high voltage measuring |
-
2010
- 2010-05-07 CN CN 201010172132 patent/CN101860017B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5258758A (en) * | 1991-01-31 | 1993-11-02 | Crystal Semiconductor Corporation | DAC shutdown for low power supply condition |
| CN2836340Y (en) * | 2005-11-02 | 2006-11-08 | 张继科 | IGBT module drive circuit |
| CN101109771A (en) * | 2007-08-31 | 2008-01-23 | 清华大学 | Analog signal separating and transferring system used for high voltage measuring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101860017A (en) | 2010-10-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102739234B (en) | Multi-channel digital signal input/output isolating box and power control system | |
| CN103326325A (en) | Short-circuit and low-voltage protective circuit of output of switching power source | |
| CN104485756A (en) | Electricity picking device for high-voltage power transmission line | |
| CN102253331A (en) | Method and board for photoelectric trigger detection based on parallel thyristors | |
| CN104269893B (en) | Charge control method and charging system | |
| CN105871218A (en) | Driving method and device for IGBT provided with push-and-pull isolating power source | |
| CN103293985A (en) | Zero-power-consumption standby circuit | |
| CN105067901A (en) | Method and circuit of detecting attachment and detachment between a portable device and a power converter | |
| CN102684652A (en) | Synchronous pulse control circuit for preventing faults of microprogrammed control unit (MCU) or driving integrated circuit (IC) | |
| CN201541118U (en) | Three-phase power protecting device of power load | |
| CN109600046A (en) | Failure automatically switches DC-DC converter | |
| CN101860017B (en) | Control device for high-voltage and high-power power electronic converter system | |
| CN102769336B (en) | Single-phase inverter for emergency power supply | |
| CN204928349U (en) | Automatic uninterrupted power source device of monocell | |
| CN105958844A (en) | Intelligent soft switching power supply realization method and intelligent soft switching power supply | |
| CN209746083U (en) | Offline simulation debugging device for arc suppression coil | |
| CN105356564A (en) | Wireless energy receiving system | |
| CN102386902A (en) | Fail to safe relay and driving method thereof | |
| CN104635272A (en) | Distributed high-density electrical method instrument | |
| CN108052041A (en) | Remote on-off control device and system | |
| CN101232278A (en) | Gate circuit transistor valve electropositive potential electronic plate | |
| CN105811741A (en) | Power interface circuit | |
| CN203027250U (en) | Pulse width modulation signal isolation conversion electric signal output module | |
| CN211296561U (en) | Reverse connection prevention high-current switching high-voltage box circuit | |
| CN204290507U (en) | A kind of electricity getting device of ultra-high-tension power transmission line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |