CN207636707U - A kind of high-voltage breakdown, low pressure ageing discharge tube test system - Google Patents
A kind of high-voltage breakdown, low pressure ageing discharge tube test system Download PDFInfo
- Publication number
- CN207636707U CN207636707U CN201721574611.2U CN201721574611U CN207636707U CN 207636707 U CN207636707 U CN 207636707U CN 201721574611 U CN201721574611 U CN 201721574611U CN 207636707 U CN207636707 U CN 207636707U
- Authority
- CN
- China
- Prior art keywords
- circuit
- voltage
- discharge tube
- input terminal
- transformer
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses the discharge tubes of a kind of high-voltage breakdown, low pressure ageing to test system; the primary coil of first transformer T1 connects voltage input end; the secondary coil of first transformer T1 is connected with concatenated discharge tube G to be measured and protection circuit; the sampling input terminal of the both ends connection voltage sampling circuit of circuit, the output end of voltage sampling circuit is protected to connect bleeder circuit；Current transformer L is equipped between secondary coil and discharge tube G, current transformer L connects PLC controller by current sampling circuit；Voltage input end passes through third transformer T3 connection bleeder circuits by the second transformer T2 connection voltage sampling circuits, voltage input end；Bleeder circuit connects current transformer L close to one end of secondary coil, and bleeder circuit also connects voltage input end by current-limiting circuit.The low-voltage that can be automatically switched to after high electrical breakdown discharge tube of the utility model carries out ageing to discharge tube.
Description
Technical field
The utility model belongs to discharge tube technical field of measurement and test, and in particular to a kind of high-voltage breakdown, the electric discharge of low pressure ageing
Pipe tests system.
Background technology
The ageing processing of discharge tube is the preceding necessary process of discharge tube manufacture.The method of ageing is added at discharge tube both ends
Voltage, when voltage reaches certain numerical value, discharge tube is breakdown, while keeping the discharge current of a period of time, reaches ageing effect
Fruit.Meanwhile discharge current at this time is detected, the quality of discharge tube is may determine that according to the size of electric current.
The discharge tube breakdown voltage of different model is different, and some breakdown voltages can reach 6000V, and ageing electric current is up to
7.5A, the way of the traditional forms of enterprises are to carry out ageing to discharge tube with the breakdown voltage.With this condition, in several seconds, discharge tube
A large amount of electric energy can be consumed.
Invention content：
The purpose of this utility model be to provide a kind of high-voltage breakdown, low pressure ageing discharge tube test system, can be in height
Low-voltage is automatically switched to after voltage breakdown discharge tube, ageing is carried out to discharge tube, to solve the problems, such as background technology.
To achieve the goals above, the technical solution of the utility model is：
A kind of high-voltage breakdown, low pressure ageing discharge tube test system, the primary coil of the first transformer T1 connects voltage
The secondary coil of input terminal, the first transformer T1 is connected with concatenated discharge tube G to be measured and protection circuit, protects the both ends of circuit
The sampling input terminal of voltage sampling circuit is connected, the output end of voltage sampling circuit connects bleeder circuit；Secondary coil and electric discharge
Current transformer L is equipped between pipe G, current transformer L connects PLC controller by current sampling circuit；Voltage input end is logical
The second transformer T2 connection voltage sampling circuits are crossed, voltage input end passes through third transformer T3 connection bleeder circuits；Partial pressure electricity
Road connects current transformer L close to one end of secondary coil, and bleeder circuit also connects voltage input end by current-limiting circuit.
Preferably, current-limiting circuit is multi gear position current-limiting circuit, include the current-limiting resistance of several parallel connections, each current-limiting resistance
(R1-R4) one driving switch of series connection.
Preferably, protection circuit includes the diode (D1, D2) of two reverse parallel connections.
Preferably, voltage sampling circuit includes two sampling input terminals, it is denoted as the first sampling input terminal and second respectively and adopts
Sample input terminal, the first sampling input terminal are set to protection circuit close to one end of discharge tube G, and the second sampling input terminal is set to guarantor
Protection circuit is close to one end of secondary coil；The conduct after the sampling input terminal confluences of resistance R6 and first of second sampling input terminal
The sampled signal input of voltage sampling circuit.
Preferably, operational amplifier U1 and electricity are passed through in sampled signal input connection two-way output, first via output successively
The negative input of R7 connection voltage comparators U4 is hindered, the electrode input end of voltage comparator U4 connects the defeated of the second transformer T2
Outlet, the output end connecting triode Q3 and Light-emitting diode LED 1 of voltage comparator U4；
The output of second tunnel connects voltage comparator after passing through operational amplifier U2, sign-changing amplifier U3 and resistance R8 successively
The negative input of U5, the electrode input end of voltage comparator U5 connect the output end of the second transformer T2, voltage comparator U5
Output end connecting triode Q4 and Light-emitting diode LED 2.
Preferably, bleeder circuit includes several silicon controlled modules, the silicon-controlled input terminal of several silicon controlled modules is in parallel, number
The silicon-controlled output end of a silicon controlled module is connected.
Preferably, silicon controlled module includes photoelectrical coupler U6 and photoelectrical coupler U7, the input terminal of photoelectrical coupler U6
Connecting triode Q4 and Light-emitting diode LED 2, the base stage and collector of the output end connecting triode Q5 of photoelectrical coupler U6；
The output end of the input terminal connecting triode Q3 and Light-emitting diode LED 1 of photoelectrical coupler U7, photoelectrical coupler U7 connect three poles
The base stage and collector of pipe Q6；
For triode Q5 by the negative pole end of resistance R9 connection diodes D4, the positive terminal of diode D4 is silicon controlled module
Silicon controlled module input terminal；For triode Q6 by the negative pole end of resistance R10 connection diodes D3, the positive terminal of diode D3 is can
Control the silicon controlled module output end of silicon module；
Triode Q5 connects the output of third transformer T3 with the collector of triode Q6 by a rectification circuit respectively
End；
Filtering is additionally provided between diode D3 and diode D4 and silicon controlled module input terminal and silicon controlled module output end
Circuit.
Preferably, the silicon controlled module input terminal positioned at the silicon controlled module of bleeder circuit input terminal connects current-limiting circuit,
Current transformer L is connected close to secondary coil positioned at the silicon controlled module output end of the silicon controlled module of bleeder circuit output end
One end；From bleeder circuit input terminal to the silicon controlled module output end of each silicon controlled module bleeder circuit output end with
The silicon controlled module input terminal of adjacent silicon controlled module connects.
Preferably, being additionally provided with inverter circuit, inverter circuit between the output end and voltage sampling circuit of the second transformer T2
Including two diodes, two three-terminal voltage-stabilizing integrated chips and several electrolytic capacitors.
Preferably, current sampling circuit is included in the rectified current being arranged between the coil and PLC controller of current transformer L
Road G3, electrolytic capacitor C1 and resistance R11.
The beneficial effects of the utility model are：The utility model provides a kind of circuit, can discharge in high electrical breakdown
Low-voltage is automatically switched to after pipe, ageing is carried out to discharge tube, after high-voltage breakdown discharge tube, be switched to low-voltage progress rapidly
Ageing can be a large amount of electric energy of link saving that enterprise carries out discharge tube test.
Description of the drawings
Fig. 1 is the integrated circuit structural schematic diagram of the utility model embodiment,
Fig. 2 be the utility model embodiment voltage sampling circuit in silicon controlled module structural schematic diagram,
Fig. 3 is the bleeder circuit structural schematic diagram of the utility model embodiment,
Fig. 4 is the inverter circuit structural schematic diagram of the utility model embodiment.
In figure：1- voltage sampling circuits, 2- bleeder circuits, 3- current-limiting circuits, 4- current sampling circuits, 5- protect circuit.
Specific implementation mode
The utility model is described further with reference to the accompanying drawings and examples.
As shown in Figure 1 a kind of high-voltage breakdown, low pressure ageing discharge tube test system, the primary coil of the first transformer T1
Voltage input end is connected, the secondary coil of the first transformer T1 is connected with concatenated discharge tube G to be measured and protection circuit, protection electricity
The sampling input terminal of the both ends connection voltage sampling circuit on road, the output end of voltage sampling circuit connect bleeder circuit；Secondary wire
Current transformer L is equipped between circle and discharge tube G, current transformer L connects PLC controller by current sampling circuit；Voltage
Input terminal divides electricity by the second transformer T2 connection voltage sampling circuits, voltage input end by the T3 connections of third transformer
Road；Bleeder circuit connects current transformer L close to one end of secondary coil, and it is defeated that bleeder circuit also connects voltage by current-limiting circuit
Enter end.
Current-limiting circuit is multi gear position current-limiting circuit, includes the current-limiting resistance of several parallel connections, each current-limiting resistance (R1-R4) string
Join a driving switch.
Protection circuit includes the diode (D1, D2) of two reverse parallel connections.
As shown in Fig. 2, voltage sampling circuit includes two sampling input terminals, it is denoted as the first sampling input terminal and second respectively
Input terminal is sampled, the first sampling input terminal is set to protection circuit close to one end of discharge tube G, and the second sampling input terminal is set to
Protect circuit close to one end of secondary coil；Second sampling input terminal is made after the sampling input terminal confluences of resistance R6 and first
For the sampled signal input of voltage sampling circuit.
Sampled signal input connects two-way output, and first via output is connected by operational amplifier U1 with resistance R7 successively
The negative input of voltage comparator U4, the electrode input end of voltage comparator U4 connect the output end of the second transformer T2, electricity
Press the output end connecting triode Q3 and Light-emitting diode LED 1 of comparator U4；
The output of second tunnel connects voltage comparator after passing through operational amplifier U2, sign-changing amplifier U3 and resistance R8 successively
The negative input of U5, the electrode input end of voltage comparator U5 connect the output end of the second transformer T2, voltage comparator U5
Output end connecting triode Q4 and Light-emitting diode LED 2.
Bleeder circuit includes several silicon controlled modules, and the silicon-controlled input terminal of several silicon controlled modules is in parallel, several controllable
The silicon-controlled output end of silicon module is connected.
Silicon controlled module as shown in Figure 3 includes photoelectrical coupler U6 and photoelectrical coupler U7, the input of photoelectrical coupler U6
Hold connecting triode Q4 and Light-emitting diode LED 2, the base stage and current collection of the output end connecting triode Q5 of photoelectrical coupler U6
Pole；The output end of the input terminal connecting triode Q3 and Light-emitting diode LED 1 of photoelectrical coupler U7, photoelectrical coupler U7 connect
The base stage and collector of triode Q6；
For triode Q5 by the negative pole end of resistance R9 connection diodes D4, the positive terminal of diode D4 is silicon controlled module
Silicon controlled module input terminal；For triode Q6 by the negative pole end of resistance R10 connection diodes D3, the positive terminal of diode D3 is can
Control the silicon controlled module output end of silicon module；
Triode Q5 connects the output of third transformer T3 with the collector of triode Q6 by a rectification circuit respectively
End；
Filtering is additionally provided between diode D3 and diode D4 and silicon controlled module input terminal and silicon controlled module output end
Circuit.
Bleeder circuit input terminal is the silicon controlled module input terminal connection current-limiting circuit of silicon controlled module, is located at partial pressure electricity
The silicon controlled module output end of the silicon controlled module of road output end connects current transformer L close to one end of secondary coil；From point
Volt circuit input terminal to each silicon controlled module between bleeder circuit output end silicon controlled module output end with it is adjacent controllable
The silicon controlled module input terminal of silicon module connects.
It is additionally provided with inverter circuit between the output end and voltage sampling circuit of second transformer T2, as shown in figure 4, inversion is electric
Road includes two diodes, two three-terminal voltage-stabilizing integrated chips (7812 and 7912) and several electrolytic capacitors.
Current sampling circuit is included in rectification circuit G3, the electricity being arranged between the coil and PLC controller of current transformer L
Solve capacitance C1 and resistance R11.
It is additionally provided with current-limiting resistance R5 between current transformer L and the first transformer T1.
The operation principle of circuit described in the present embodiment is as follows：
After powering on, the 400V alternating currents of voltage input end are by U, V dual-point entry circuit, by the first transformer T1
Become 6000V；
The voltage of 6000V is by current-limiting resistance R5 successively through over-current sensor L, discharge tube G and protection circuit discharging pipe G
Input terminal and protect circuit output end between there are voltage difference, guiding discharge pipe G is started to discharge by 6000V voltage breakdowns.
After 6000V voltage breakdown discharge tubes G, discharge tube G conducting, the input terminal of discharge tube still with the presence of residual voltage,
According to the difference of discharge tube G, residual voltage is different, about in 200V or so.
Voltage of the voltage sampling circuit to the electromagnetic coil of mutual inductor L close to stimulating coil one end is acquired, after acquisition
Voltage sampling signal is amplified by the resistance R7 of LM324 operational amplifiers U1 to 1K all the way, by LM393 operation amplifiers
Device U4 carries out voltage comparison, outputs voltage signal to the emitter formation of the negative pole end and triode Q3 of Light-emitting diode LED 1
Port.Another way is carried out reversely, then passing through LM393 ratios by LM324 sign-changing amplifiers U3 after the U2 amplifications of LM324 amplifiers
Stronger U5 carries out voltage comparison, and the emitter of the negative pole end and triode Q4 that output voltage signal to Light-emitting diode LED 2 is formed
Port.Wherein triode Q3 and Q4 plays the role of signal amplification driving, and two Light-emitting diode LED 1 and LED2 are instructions
Lamp.
The corresponding terminal of each silicon controlled module in two output ports access bleeder circuit of voltage sampling circuit, makes light
Electric coupler U6 and U7 conducting, two rectification circuit G1 and G2 are accessed exchanges 12V electricity by what the secondary side of third transformer T3 exported
Source, after rectification circuit G1 and G2, DC voltage is input to the collector of triode Q5 and Q6, is amplified to signal, drives
Move the silicon-controlled D3 and D4 of subsequent one group of Opposite direction connection so that respectively there are one lead D3 and D4 in the positive-negative half-cycle of supply voltage
It is logical, in this way by the first output end of one group of silicon controlled module and second output terminal series connection after, it is multigroup silicon-controlled by 6000V high pressures
Partial pressure, high-pressure energy are released.In silicon controlled module, resistance R9, R10 after Q1, Q2 play metering function, diode
U8, U9, R12 and U10, U11, R13 protect silicon-controlled D3 and D4 respectively, prevent its reverse breakdown, the resistance capacitance C3 on the right,
C2, R14, R15, R16, R17 play the role of filtering and protection circuit.
Bleeder circuit conducting after, 400V voltages by voltage input end arrive current-limiting circuit input terminal, by adjusting R1 to
R4 distinguishes concatenated each driving switch, and 400V voltages is made to reach the input terminal of bleeder circuit by different stalls current-limiting resistance,
Again by the output end of bleeder circuit bleeder circuit and current transformer L that have been turned on close to one end of current-limiting resistance R5.
Since the residual voltage of discharge tube G input terminals is about 200V<400V, so 400V voltages pass through current transformer L
Input terminal to the input terminal of discharge tube G, be added on the discharge tube G punctured, persistently generate discharge current, to discharge tube G
Carry out ageing.
Due to silicon-controlled one-way conduction, and pressure voltage is higher than 6000V, so 6000V high pressures are mutual without going past electric current
Sensor L to bleeder circuit output end and reflux return bleeder circuit input terminal, damage low-voltage circuit.
Protection circuit includes high current the diode D1 and D2 of parallel connection, and conducting voltage is about 0.7V, this voltage is sampling
The sampled voltage of circuit board A7.
Test circuit in the utility model is detected, in actual production simultaneously with after in equipment in kind for six roads
Ageing speed is 70/minute.It is 3s by the burning-in period of every discharge tube, ageing electric current is pressed average 3A and calculated, then in 1 minute
Result of calculation is as follows：
The electric energy of traditional ageing test circuit consumption is about：
70*6000V*3A*3/3600H=1.05Kwh,
After the utility model ageing test circuit, the electric energy consumed under similarity condition is about：
70*400V*3A*3/3600H=0.07Kwh,
The electric energy then saved in 1 minute is about 0.98Kwh.The electric energy that manufacturing enterprise saves for 24 hours is 1411.2Kwh.It presses
It is calculated within 300 days according to the annual production of the enterprise, electricity price is calculated by 0.6 yuan/Kwh, then the electric energy that single device is saved for 1 year is about
254016 yuan, the very considerable electricity charge are saved for manufacturing enterprise.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.Do not make in this specification in detail
What is carefully described partly belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. the discharge tube of a kind of high-voltage breakdown, low pressure ageing tests system, it is characterised in that：The primary coil of first transformer T1
Voltage input end is connected, the secondary coil of the first transformer T1 is connected with concatenated discharge tube G to be measured and protection circuit, institute
State the sampling input terminal of the both ends connection voltage sampling circuit of protection circuit, the output end connection partial pressure of the voltage sampling circuit
Circuit；Pass through current sample equipped with current transformer L, the current transformer L between the secondary coil and the discharge tube G
Circuit connects PLC controller；The voltage input end passes through the second transformer T2 connections voltage sampling circuit, the voltage
Input terminal passes through the third transformer T3 connections bleeder circuit；The bleeder circuit connects the current transformer L close to institute
One end of secondary coil is stated, the bleeder circuit also connects the voltage input end by current-limiting circuit.
2. the discharge tube of a kind of high-voltage breakdown according to claim 1, low pressure ageing tests system, it is characterised in that：Institute
It is multi gear position current-limiting circuit to state current-limiting circuit, includes the current-limiting resistance of several parallel connections, one shelves of each current-limiting resistance series connection
Bit switch.
3. the discharge tube of a kind of high-voltage breakdown according to claim 1, low pressure ageing tests system, it is characterised in that：Institute
State the diode that protection circuit includes two reverse parallel connections.
4. the discharge tube of a kind of high-voltage breakdown according to claim 1, low pressure ageing tests system, it is characterised in that：Institute
It includes two sampling input terminals to state voltage sampling circuit, is denoted as the first sampling input terminal and the second sampling input terminal respectively,
The first sampling input terminal is set to the protection circuit close to one end of the discharge tube G, the second sampling input terminal
The protection circuit is set to close to one end of the secondary coil；The second sampling input terminal is by resistance R6 and described the
Sampled signal input after one sampling input terminal confluence as the voltage sampling circuit.
5. the discharge tube of a kind of high-voltage breakdown according to claim 4, low pressure ageing tests system, it is characterised in that：Institute
Sampled signal input connection two-way output is stated, first via output connects voltage ratio with resistance R7 by operational amplifier U1 successively
Compared with the negative input of device U4, the electrode input end of the voltage comparator U4 connects the output end of the second transformer T2,
The output end connecting triode Q3 and Light-emitting diode LED 1 of the voltage comparator U4；
The output of second tunnel connects voltage comparator U5's after passing through operational amplifier U2, sign-changing amplifier U3 and resistance R8 successively
Negative input, the electrode input end of the voltage comparator U5 connect the output end of the second transformer T2, the voltage
The output end connecting triode Q4 and Light-emitting diode LED 2 of comparator U5.
6. the discharge tube of a kind of high-voltage breakdown according to claim 5, low pressure ageing tests system, it is characterised in that：Institute
It includes several silicon controlled modules to state bleeder circuit, and the silicon-controlled input terminals of several silicon controlled modules is in parallel, it is several it is described can
Control the silicon-controlled output end series connection of silicon module.
7. the discharge tube of a kind of high-voltage breakdown according to claim 6, low pressure ageing tests system, it is characterised in that：Institute
State the input terminal connection described three that silicon controlled module includes photoelectrical coupler U6 and photoelectrical coupler U7, the photoelectrical coupler U6
Pole pipe Q4 and the Light-emitting diode LED 2, the base stage and current collection of the output end connecting triode Q5 of the photoelectrical coupler U6
Pole；The input terminal of the photoelectrical coupler U7 connects the triode Q3 and the Light-emitting diode LED 1, the photoelectric coupling
The base stage and collector of the output end connecting triode Q6 of device U7；
For the triode Q5 by the negative pole end of resistance R9 connection diodes D4, the positive terminal of the diode D4 is described controllable
The silicon controlled module input terminal of silicon module；The triode Q6 passes through the negative pole end of resistance R10 connection diodes D3, two pole
The positive terminal of pipe D3 is the silicon controlled module output end of the silicon controlled module；
The triode Q5 connects the third transformer by a rectification circuit respectively with the collector of the triode Q6
The output end of T3；
The diode D3 and diode D4 and the silicon controlled module input terminal and the silicon controlled module output end it
Between be additionally provided with filter circuit.
8. the discharge tube of a kind of high-voltage breakdown according to claim 7, low pressure ageing tests system, it is characterised in that：Position
The current-limiting circuit is connected in the silicon controlled module input terminal of the silicon controlled module of the bleeder circuit input terminal, is located at described point
The silicon controlled module output end of the silicon controlled module of volt circuit output end connects the current transformer L close to the secondary coil
One end；From the bleeder circuit input terminal to the silicon-controlled mould of each silicon controlled module the bleeder circuit output end
Block output end is connect with the silicon controlled module input terminal of adjacent silicon controlled module.
9. the discharge tube of a kind of high-voltage breakdown according to claim 5, low pressure ageing tests system, it is characterised in that：Institute
It states and is additionally provided with inverter circuit between the output end and the voltage sampling circuit of the second transformer T2, the inverter circuit includes two
A diode, two three-terminal voltage-stabilizing integrated chips and several electrolytic capacitors.
10. system is tested according to the discharge tube of a kind of high-voltage breakdown of claim 1-9 any one of them, low pressure ageing, it is special
Sign is：The current sampling circuit be included between the coil and the PLC controller of the current transformer L be arranged it is whole
Current circuit G3, electrolytic capacitor C1 and resistance R11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721574611.2U CN207636707U (en) | 2017-11-22 | 2017-11-22 | A kind of high-voltage breakdown, low pressure ageing discharge tube test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721574611.2U CN207636707U (en) | 2017-11-22 | 2017-11-22 | A kind of high-voltage breakdown, low pressure ageing discharge tube test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207636707U true CN207636707U (en) | 2018-07-20 |
Family
ID=62857551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721574611.2U Expired - Fee Related CN207636707U (en) | 2017-11-22 | 2017-11-22 | A kind of high-voltage breakdown, low pressure ageing discharge tube test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207636707U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533898A (en) * | 2021-07-23 | 2021-10-22 | 中国振华集团永光电子有限公司（国营第八七三厂） | Batch photoelectric coupler aging circuit |
-
2017
- 2017-11-22 CN CN201721574611.2U patent/CN207636707U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113533898A (en) * | 2021-07-23 | 2021-10-22 | 中国振华集团永光电子有限公司（国营第八七三厂） | Batch photoelectric coupler aging circuit |
| CN113533898B (en) * | 2021-07-23 | 2023-07-14 | 中国振华集团永光电子有限公司（国营第八七三厂） | Aging circuit of batch photoelectric coupler |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206321697U (en) | A kind of over-voltage detection circuit and switching power circuit | |
| CN207636707U (en) | A kind of high-voltage breakdown, low pressure ageing discharge tube test system | |
| CN102545578A (en) | Single-phase half-bridge voltage-multiplying rectification PFC (power factor correction) circuit | |
| CN104184109B (en) | A kind of over-pressure safety device of light fixture burn-in test | |
| CN205812466U (en) | LED drives control circuit | |
| CN205792328U (en) | A kind of motor of rolling shutter door inverter controls device | |
| CN104280592B (en) | A kind of passive and nondestructive high frequency Magnetic isolation type DC voltage detects circuit | |
| CN106300532A (en) | Intelligent battery repairs charger charging circuit | |
| CN205901576U (en) | Igbt drive circuit | |
| CN105425022A (en) | Simple detection circuit for mains voltage | |
| CN206196097U (en) | Lighting device , control chip and linear dimming system | |
| CN209882164U (en) | Single-lamp control system of street lamp | |
| CN209030117U (en) | A kind of single-phase Sinusoidal Inverter system adjusted based on feed forward approach | |
| CN107040143A (en) | Power circuit, method of supplying power to and its measuring instrument being made | |
| CN107390083A (en) | A kind of portable cable verification and cable live detection instrument | |
| CN209432886U (en) | A kind of current detection circuit and current detecting system based on BUCK circuit | |
| CN105450053B (en) | Gasoline engine parallel connection rectifying and pressure-regulating control circuit | |
| CN202735478U (en) | Device for testing rectifier bridges | |
| CN105517243A (en) | LED (light emitting diode) automatic-control serial and parallel circuit for alternating current direct-drive LED and method | |
| CN107567133B (en) | Work in the LED constant current control device under a variety of line voltages | |
| CN206820660U (en) | A kind of intelligent half-bridge amendment wave voltage change-over circuit based on PFC | |
| CN204859676U (en) | LED drive arrangement | |
| CN205193149U (en) | Simple and easy detection circuitry of line voltage | |
| CN205941856U (en) | Electricity source plate input voltage automatic switch -over aging device | |
| CN206077757U (en) | Direct current input LED power drives module |
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: 20180720 Termination date: 20191122 |