CN206099747U - Computer power module's undervoltage protection circuit excessively - Google Patents
Computer power module's undervoltage protection circuit excessively Download PDFInfo
- Publication number
- CN206099747U CN206099747U CN201621104945.9U CN201621104945U CN206099747U CN 206099747 U CN206099747 U CN 206099747U CN 201621104945 U CN201621104945 U CN 201621104945U CN 206099747 U CN206099747 U CN 206099747U
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- under
- comparison circuit
- resistance
- 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
Landscapes
- Power Sources (AREA)
Abstract
The utility model provides a computer power module's undervoltage protection circuit excessively, including test section and transfer unit branch, the test section includes at least one detection module, detection module includes under -voltage comparison circuit, excessive pressure comparison circuit and warning circuit, under -voltage comparison circuit and excessive pressure comparison circuit respectively are a hysteresis comparator, two comparison circuit of test voltage simultaneous input and reference voltage compare, comparison circuit's output connection warning circuit, the transmission circuit includes microcontroller and LAN bus module, comparison circuit's output connection microcontroller, microcontroller passes through LAN bus module and connects the host computer. The utility model discloses can carry out excessive pressure and undervoltage protection to computer power module simultaneously, small, the precision is high, and safe and reliable is convenient general, transmits more intelligently.
Description
Technical field
This utility model belongs to field of circuit technology, is related to computer power protection, and particularly overvoltage/undervoltage protection is a kind of micro-
The over under-voltage protection circuit of electromechanical source module.
Background technology
Microcomputer protection system is the important component part of power system, and the malfunction or tripping of microcomputer protecting device all can be to electricity
Guipure carrys out strong influence, and its importance is self-evident.And the working power protected is then that whole microcomputer protecting device correctly may be used
By the driving force of action.At present when actual motion is overhauled, in order to ensure the reliable correct operation of microcomputer protecting device, in routine
In maintenance process, take perfect repair process periodically to verify to protection device, and when taking repair based on condition of component strategy, adopt more
Take central processing unit (CPU, Central Processing Unit) calculating and logical judgment ability to protection device each
Unit status is detected that failure judgement simultaneously sends warning information.But whether routine is overhauled or repair based on condition of component, is lacked
Real-time monitoring and alarm to protection device working power, when when overtension, too low or even direct power down, CPU cannot
Work, the self-checking function of device also cannot be run.Additionally due to protection device running environment is severe, the hardware of power insert is old
Change, the phenomenon of voltage instability or direct power down easily occurs in device working power.The thing followed can cause the work of device unstable
The problems such as fixed, work efficiency is low, working life is greatly shortened, cost also inevitably increases.
At present, many power modules all have overvoltage/undervoltage defencive function, however, the overvoltage/undervoltage of these power modules is protected but
There are many limitation, for example：First, inside power module, manufacturer makes in process of production for overvoltage/undervoltage protection packaging, user
Cannot according to demand Adjustment precision and protection electric pressure；2nd, universal defencive function precision is too low, and has high-precision protection
Circuit cost is higher；3rd, each power supply is required for individually overvoltage or a under-voltage protecting circuit, and cost is very high.Existing mistake
Under-voltage protection scheme is not suitable for the use demand of the power detecting of microcomputer protecting device, it is impossible to the maintenance with microcomputer protecting device
Docking is used, in addition, protection circuit of the prior art is only capable of being adjusted power module inside, user cannot obtain power supply
Work state information, power management personnel lack warning message detailed enough to system mode.Therefore, how safe and reliable,
The abnormal operating state of protection device power module under multiple electric pressures must be promptly and accurately detected, and to testing staff
Give a warning until power module recovers normal work, be computer power protection one, field problem demanding prompt solution.
The content of the invention
Problem to be solved in the utility model is：For the deficiency of microcomputer protection system in prior art, design in time
Accurately, volume is less, general context wider, the more intelligentized computer power overvoltage/undervoltage protection module of signal transmission, so as to reality
The safe and reliable operation of existing computer power.This programme is solved by the cooperation using digital control chip and digital regulation resistance
The free configuration adjustment current potential of user and degree of regulation problem, by data bus transmission, solve warning signal to host computer
Transmission problem, and circuit high precision, it is cheap, it is adaptable to all kinds of power-supply systems.
The technical solution of the utility model is：A kind of over under-voltage protection circuit of computer power module, including detection part
And hop, detection part include at least one detection module, detection module include under-voltage comparison circuit, overvoltage comparison circuit
And warning circuit, under-voltage comparison circuit and overvoltage comparison circuit are respectively a hysteresis comparator, and test voltage is defeated with reference voltage
Enter two comparison circuits, the output connection warning circuit of comparison circuit, transmission circuit includes microcontroller and local area network bus mould
Block, the output connection microcontroller of comparison circuit, microcontroller connects host computer by local area network bus module.
Preferably, in under-voltage comparison circuit, test voltage VaConnection resistance R1With the first digital regulation resistance R7
The under-voltage bleeder circuit of composition, partial pressure output port is INA, port INA and reference voltage VrefInput Schmidt trigger A, applies
The output Jing not gates of schmitt trigger A, metal-oxide semiconductor (MOS) compare the under-voltage detection letter of output port OUTA outputs to under-voltage
Number；In overvoltage comparison circuit, test voltage VaConnection resistance R2With the second digital regulation resistance R8The over-pressed bleeder circuit of composition, point
Pressure output port is INB, port INB and reference voltage VrefInput Schmidt trigger B, the output Jing of Schmidt trigger B are non-
Door, metal-oxide semiconductor (MOS) compare output port OUTB output overvoltage detection signals to under-voltage.
Further, warning circuit is correspondingly provided with undervoltage warning circuit and over voltage alarm circuit, and undervoltage warning circuit includes
Pull-up resistor R3, protective resistance R4With diode D1, detection part is by source voltage VbPower supply, VbWith the indirect filter capacitor C on ground1It is anti-
Interference High frequency filter, protective resistance R4With diode D1Series connection, then with pull-up resistor R3It is connected in parallel on source voltage VbWith port OUTA it
Between, over voltage alarm circuit is identical with undervoltage warning circuit structure.
Further, detection voltage grade, each detection are arranged by the resistance of microcontroller regulation digital regulation resistance
The supply voltage of the electric pressure of module correspondence detection setting.
Further, by adjusting digital regulation resistance, change the threshold voltage for activating alarm, set protection precision etc.
Level.
Preferably, the protection circuit is integrated on a chip.
This utility model efficiently solves microsystem in prior art because equipment power module breaks down and deposits
Problem.Microcontroller is according to test voltage VaSetting digital regulation resistance numerical value, in under-voltage protection detection process, test electricity
Pressure VaWith reference voltage VrefIn OUTA port output signals after relatively, when voltage drops to negative sense threshold voltage VIT-(A)Below
When, OUTA output low levels, R4Make protective resistance, diode D1Conducting is luminous, generates alarm；When voltage rises to positive threshold values
Voltage VIT+(A)During the above, OUTA port signals are pulled up resistance R3Clamper is eliminated in high level, alarm.In the same manner, in overvoltage protection
In detection process, when voltage rises to positive threshold voltage VIT+(B)During the above, diode D2Conducting sends alarm；When under voltage
Drop to negative sense threshold voltage VIT-(B)When following, alarm is eliminated.Detection signal and caution signalss can in time be conveyed to microcontroller,
And by the incoming host computer of local area network bus, testing staff completes right according to the signal adjustment microsystem supply voltage for receiving
The overvoltage/undervoltage protection of computer power module.
The defect of protection scheme is protected for line under-voltage in prior art, the utility model proposes being changed with microcontroller
Digital regulation resistance resistance, adjusts divider resistance to meet the detection requirement of current voltage grade, makes the overvoltage/undervoltage detection and protects
Circuit is applied to the power module of free voltage grade and protects；Simultaneously the signal that detection module sends is received using microcontroller,
By local area network bus it is timely, it is accurate must be transferred to host computer, whole system is more intelligent.
Compared with prior art, this utility model can carry out overvoltage and under-voltage protection, body to computer power module simultaneously
Little, the high precision of product, it is safe and reliable, facilitate general, transmit more intelligent.The beneficial effects of the utility model are as follows：
1st, the circuit in the present invention is few using device, and all circuits can be integrated on one chip, small volume；
2nd, the computer power module protection detection part in the present invention can simultaneously detect over-pressed and under-voltage two kinds of anon-normal
Normal working condition simultaneously sends warning signal, and when supply voltage recovers in setting working range, alarm is eliminated automatically, can be effective
The voltage instability phenomenon of reply device working power, it is more detailed to the status display of working power；
3rd, the computer power module in the present invention can simultaneously detect the running voltage of various electric pressures, be adjusted by programming
Integer word potentiometer resistance, without the need for manually adjusting to circuit, generalization is high, low cost；Circuit can be transmitted using digital control
Signal is to host computer, while the configuration data of host computer can be received, by the value that the target detection Voltage Cortrol of circuit is needs, nothing
Any adjustment physically need to be carried out to circuit, is used and is more convenient, more versatility；
4th, each road signal detected in the present invention not public domain, separate, each road voltage signal of detection, through every
From eliminating the danger of personal injury that high-voltage signal is likely to result in；Circuit adopts modularized design, while multiple signals are detected,
Each module not altogether, is independent of each other, and can as needed extend any multimode；And while each detection module share control unit,
Cost is not additionally increased；
5th, using microcontroller and local area network bus (CAN, Controller Area Network) transmission inspection in the present invention
Survey signal and receive configuration data to host computer, from host computer, be directly used in the Strategies of Maintenance of microcomputer protecting device, intelligence degree
It is high.
Description of the drawings
Fig. 1 is this utility model voltage detection module inside comparison circuit schematic diagram.
Fig. 2 is this utility model voltage detection module circuit diagram.
Fig. 3 is this utility model microcontroller and local area network bus signal transmission module topology.
Fig. 4 is this utility model computer power modularity overvoltage/undervoltage protection integrated circuit figure.
Fig. 5 is the connection of detection part and microcontroller in this utility model computer power modularity over under-voltage protection circuit
Circuit diagram.
Specific embodiment
As shown in figure 4, this utility model modularity over under-voltage protection circuit includes detection part and hop, test section
Dividing includes at least one detection module, and detection module includes under-voltage comparison circuit, overvoltage comparison circuit and warning circuit, under-voltage ratio
It is respectively a hysteresis comparator compared with circuit and overvoltage comparison circuit, test voltage is input into two comparison circuits and reference voltage ratio simultaneously
Compared with the output connection warning circuit of comparison circuit, transmission circuit includes microcontroller and local area network bus module, comparison circuit
Output connection microcontroller, microcontroller connects host computer by local area network bus module.
In order that those skilled in the art more fully understands the technical solution of the utility model, below with reference to accompanying drawing and
Specific embodiment, is described in detail to the technical solution of the utility model.
Such as Fig. 1, be voltage detection module comparison circuit schematic diagram shown in, including under-voltage comparison circuit and overvoltage it is more electric
Road, its structure mainly by the hysteresis comparator using Schmidt trigger, logic inverter, metal-oxide semiconductor (MOS) (metal-oxide-semiconductor,
Mental Oxide Semiconductor) constitute.The signal to carry out under-voltage detection of under-voltage signal input part INA inputs,
The signal to carry out over-pressed detection of over-pressed signal end input INB inputs, both and reference voltage VrefInput sluggishness compares
Device, hysteresis comparator output NAND gate connection, not gate is connected with metal-oxide-semiconductor, and the output mode of metal-oxide-semiconductor is open-drain output.
(1) under-voltage protection
In under-voltage comparison circuit, the positive threshold voltage V of Schmidt trigger AIT+(A)To recover voltage, negative sense threshold values electricity
Pressure VIT-(A)For reference voltage, for under-voltage protection, when comparison voltage initial value is less than reference voltage VrefWhen, sluggishness compares
Device export low level, through not gate metal-oxide-semiconductor grid input high level, metal-oxide-semiconductor drain electrode is under-voltage protection control signal OUTA
Port is grounded.Comparison voltage is increased to into recovery voltage (i.e. higher than reference voltage Vref), hysteresis comparator output under-voltage protection control
Signal processed is high level, through not gate metal-oxide-semiconductor grid input low level, metal-oxide-semiconductor is not turned on, and OUTA ports are in high resistant
State.If comparison voltage initial value is more than reference voltage, hysteresis comparator directly exports high level, and OUTA ports are in high resistant
State.
By shown in Fig. 2 voltage detection module circuit diagrams, under under-voltage protection state, test voltage VaThrough the under-voltage inspection of resistance
Survey divider resistance R1With the first digital regulation resistance R7Partial pressure is input into comparison voltage in INA ports, when comparison voltage initial value is less than ginseng
Examine voltage VrefWhen, OUTA ground connection, undervoltage alarm diode D1Forward conduction lights, and sends alarm；Protective resistance R4Current limliting, prevents
The excessive damage of diode current, source voltage VbWith the indirect filter capacitor C on ground1Anti-interference High frequency filter.When comparison voltage is increased to
When recovering voltage, OUTA ports are through pull-up resistor R3With source voltage VbIt is connected, OUTA is high level, diode extinguishes, and alarm disappears
Remove.If comparison voltage initial value is more than reference voltage VrefWhen, OUTA is high level, and diode does not light, and sends without alarm.
According to industrial quarters design experiences, under under-voltage protection state, source voltage V is takenbFor 5V, filter capacitor C1For 0.1 μ F,
Pull-up resistor R3With protective resistance R4For 1k Ω.The positive threshold voltage V of Schmidt trigger AIT+(A)For 0.405V, negative sense threshold values
Voltage VIT-(A)For 0.4V, reference voltage V is chosenrefFor the negative sense threshold voltage 0.4V of Schmidt trigger A.Digital regulation resistance R7
With resistance R1Value relation be
When test voltage is 5V, R1With digital regulation resistance R70.405V is input in INA after partial pressure, R is taken1For 20k Ω, numeral
Potentiometer value is 1763 Ω.Recover the corresponding test voltage of voltage through R1With digital regulation resistance R7It is input in INA after partial pressure
0.4V, then recovering the corresponding test voltage of voltage is
When test voltage initial value is less than 4.938V, OUTA output low levels, diode D1Conducting sends alarm, works as survey
When examination voltage increases to 5V, INA input 0.405V reach Schmidt trigger forward direction threshold voltage, and OUTA output high level is alert
Report is eliminated.When test voltage initial value is more than 4.938V, comparison voltage is more than reference voltage 0.4V, and OUTA directly exports high electricity
It is flat, there is no alarm.The accuracy class of test voltage can be by changing the first digital regulation resistance R7Resistance realize, when first
Digital regulation resistance R7Resistance raise, recover corresponding test voltage V of voltagea' reduce, precise decreasing, otherwise work as R7Resistance drop
Low, precision is improved.
(2) overvoltage protection
In the same manner, in for overvoltage comparison circuit, under overvoltage protection state, the positive threshold voltage of Schmidt trigger B
VIT+(B)For reference voltage, negative sense threshold voltage VIT-(B)To recover voltage, test voltage VaThrough overvoltage protection divider resistance R2With
Second digital regulation resistance R8Partial pressure is input into comparison voltage in over-pressed signal input part INB ports, when comparison voltage initial value is more than
Reference voltage VrefWhen, overvoltage protection control signal OUTB port ground connection, diode D2Forward conduction lights, and sends alarm.When than
When being reduced to recovery voltage compared with voltage, overvoltage protection control signal OUTB is in high-impedance state, and alarm is eliminated.If at the beginning of comparison voltage
Initial value is less than reference voltage VrefWhen, diode does not send alarm.
Second digital regulation resistance R8With resistance R2Value relation be
In present case, when test voltage is 5V, R2With digital regulation resistance R80.395V is input in INB after partial pressure, R is taken2For
20k Ω, digital regulation resistance R8Value is 1763 Ω.
Recover the corresponding test voltage of voltage through R2With digital regulation resistance R80.4V is input in INB after partial pressure, then recovers electricity
The corresponding test voltage is pressed to be
When test voltage initial value is more than 5.062V, comparison voltage is more than reference voltage 0.4V, diode D2Lead
Logical to send alarm, when test voltage is reduced to 5V, alarm is eliminated.Do not warn when test voltage initial value is less than 5.062V
Report.The precision of test voltage is adjusted, works as R8Resistance raise, precision improve；Conversely, working as R8Resistance reduce, precision reduce.
Above-mentioned parameter is selected only to show a kind of situation, can designed for any of this over under-voltage protection circuit according to this method
DC voltage level over under-voltage protection circuit parameter, adjusts microcontroller and changes digital regulation resistance according to test voltage ideal value
Resistance.Overvoltage/undervoltage is protected jointly by test voltage VaIt is limited in accuracy rating, is realized by finely tuning digital regulation resistance.Electricity
Part shown in the schematic diagram of pressure detection module inside can complete Schmidt trigger using such as TPS3701 chips replacement, not gate and
Metal-oxide-semiconductor function.
Shown in Fig. 3 microcontrollers and local area network bus signal transmission module topology, microcontroller receives detection module and sends out
The signal that goes out simultaneously is transferred to host computer by local area network bus, improves whole computer power modularity overvoltage/undervoltage protection system
Intellectuality, wherein computer power module can be led to using such as STM32 chips, local area network bus using controller local area network
Letter；Programmable microcontroller input signal, configures digital regulation resistance so as to be operated in the state of needs, with needs detection
Supply voltage grade matches.
In sum, this utility model proposes the equal base of overvoltage/undervoltage protected mode all working circuit of computer power module
In silicon device, one single chip can be integrated in, small volume, integrated level is high；Digital regulation resistance can be carried out by microcontroller
Parameter is selected, and matches any computer power running voltage protection class and precision, and in overvoltage and under-voltage condition alarm is sent, extensive
Multiple to eliminate to alarm in normal range, high precision is easy to generalization；By microcontroller and local area network bus transmission signal, intelligence
Energyization is high.
Above example is only intended to help and understands method of the present utility model and core concept, to the general of the art
For logical technical staff, on the premise of without departing from this utility model principle, can be associated naturally with citing by above description
Other equivalent application schemes, and some improvement for carrying out to this utility model and modification each fall within power of the present utility model
The protection domain of sharp claim.
Claims (6)
1. a kind of over under-voltage protection circuit of computer power module, is characterized in that including detection part and hop, test section
Dividing includes at least one detection module, and detection module includes under-voltage comparison circuit, overvoltage comparison circuit and warning circuit, under-voltage ratio
It is respectively a hysteresis comparator compared with circuit and overvoltage comparison circuit, test voltage is input into two comparison circuits with reference voltage, than
Connect warning circuit compared with the output of circuit, transmission circuit includes microcontroller and local area network bus module, the output of comparison circuit
Connection microcontroller, microcontroller connects host computer by local area network bus module.
2. the over under-voltage protection circuit of computer power module according to claim 1, in it is characterized in that under-voltage comparison circuit,
Test voltage VaConnection resistance R1With the first digital regulation resistance R7The under-voltage bleeder circuit of composition, partial pressure output port is INA, is held
Mouth INA and reference voltage VrefInput Schmidt trigger A, the output Jing not gates of Schmidt trigger A, metal-oxide are partly led
Body compares output port OUTA output brown-out detection signals to under-voltage；In overvoltage comparison circuit, test voltage VaConnection resistance R2With
Second digital regulation resistance R8The over-pressed bleeder circuit of composition, partial pressure output port is INB, port INB and reference voltage VrefInput
The output Jing not gates of Schmidt trigger B, Schmidt trigger B, metal-oxide semiconductor (MOS) compare output port to under-voltage
OUTB output overvoltage detection signals.
3. a kind of over under-voltage protection circuit of computer power module according to claim 2, is characterized in that warning circuit pair
Undervoltage warning circuit and over voltage alarm circuit should be provided with, undervoltage warning circuit includes pull-up resistor R3, protective resistance R4And diode
D1, detection part is by source voltage VbPower supply, VbWith the indirect filter capacitor C on ground1Anti-interference High frequency filter, protective resistance R4With two poles
Pipe D1Series connection, then with pull-up resistor R3It is connected in parallel on source voltage VbAnd the OUTA of port between, over voltage alarm circuit and undervoltage warning circuit
Structure is identical.
4. the over under-voltage protection circuit of the computer power module according to Claims 2 or 3, is characterized in that by microcontroller
The resistance for adjusting digital regulation resistance arranges detection voltage grade, the power supply of the electric pressure of each detection module correspondence detection setting
Voltage.
5. the over under-voltage protection circuit of the computer power module according to Claims 2 or 3, is characterized in that by adjusting first
Digital regulation resistance R7With the second digital regulation resistance R8, change the threshold voltage for activating alarm, set the grade of protection precision.
6. the over under-voltage protection circuit of computer power module according to claim 1, is characterized in that the protection circuit collection
On Cheng Yuyi chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621104945.9U CN206099747U (en) | 2016-09-30 | 2016-09-30 | Computer power module's undervoltage protection circuit excessively |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621104945.9U CN206099747U (en) | 2016-09-30 | 2016-09-30 | Computer power module's undervoltage protection circuit excessively |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206099747U true CN206099747U (en) | 2017-04-12 |
Family
ID=58482105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621104945.9U Active CN206099747U (en) | 2016-09-30 | 2016-09-30 | Computer power module's undervoltage protection circuit excessively |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206099747U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253651A (en) * | 2016-09-30 | 2016-12-21 | 国网江苏省电力公司南京供电公司 | A kind of numerically controlled modularized microcomputer source over under-voltage protection circuit |
| CN107886981A (en) * | 2017-11-28 | 2018-04-06 | 晶晨半导体(上海)股份有限公司 | A kind of power down process method applied to embedded system |
-
2016
- 2016-09-30 CN CN201621104945.9U patent/CN206099747U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253651A (en) * | 2016-09-30 | 2016-12-21 | 国网江苏省电力公司南京供电公司 | A kind of numerically controlled modularized microcomputer source over under-voltage protection circuit |
| CN107886981A (en) * | 2017-11-28 | 2018-04-06 | 晶晨半导体(上海)股份有限公司 | A kind of power down process method applied to embedded system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106253651A (en) | A kind of numerically controlled modularized microcomputer source over under-voltage protection circuit | |
| CN102916689B (en) | Digital value acquisition circuit with fault diagnosis capacity | |
| CN104133131B (en) | A kind of IGBT driving malfunctions detection and diagnostic method | |
| CN206099747U (en) | Computer power module's undervoltage protection circuit excessively | |
| CN109301919A (en) | A kind of uninterruptible power supply bypass adapter tube control method | |
| CN106924925B (en) | A kind of active output driving circuit and its implementation of input/output module | |
| CN103529281B (en) | Voltage detecting circuit, electronic equipment and the automobile of the real-time OBD of a kind of all standing | |
| CN107607777A (en) | A kind of double indicator lamp automatically retractable high voltage testing devices | |
| CN207397036U (en) | A kind of line running state monitoring system | |
| CN203929852U (en) | A kind of novel weak voltage detecting circuit | |
| CN105067927A (en) | Servo driver brake resistor loop detection method | |
| CN104037752A (en) | Sensor power-supplying device used for ship | |
| CN204479726U (en) | The indicating fault control circuit of the two redundant electrical pow er supply system of a kind of airplane signal lamp | |
| CN106405408A (en) | Monitoring device for preventing direct-current reverse mode operation power losing and detection method thereof | |
| CN104244542B (en) | Vcehicular tunnel LED illumination light adjusting and controlling device fault detect response circuit | |
| CN203166465U (en) | Overvoltage protection circuit | |
| CN105006884A (en) | Intrinsically-safe direct current system | |
| CN201444189U (en) | Anomaly identification framework of redundant power supply system | |
| CN205105192U (en) | Drive controller fault -signal output circuit based on two -stage opto -coupler combination judgement mode | |
| CN103474953A (en) | Single-phase mains voltage controller | |
| CN206894282U (en) | Charging gun electric energy protection device | |
| CN209182386U (en) | The airborne device looses power offline inspection circuit of direct current | |
| CN202077226U (en) | Electric power carrier wave lighting control device | |
| CN104133132B (en) | A kind of IGBT driving malfunctions detection and diagnostic system | |
| CN201352681Y (en) | Electronic noncontacting central electrical box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |