CN105404603B - A kind of anti-interference driving circuit of USB interface - Google Patents
A kind of anti-interference driving circuit of USB interface Download PDFInfo
- Publication number
- CN105404603B CN105404603B CN201510702614.9A CN201510702614A CN105404603B CN 105404603 B CN105404603 B CN 105404603B CN 201510702614 A CN201510702614 A CN 201510702614A CN 105404603 B CN105404603 B CN 105404603B
- Authority
- CN
- China
- Prior art keywords
- circuit
- usb interface
- data line
- counnter attack
- filter circuit
- 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
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0042—Universal serial bus [USB]
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Details Of Connecting Devices For Male And Female Coupling (AREA)
Abstract
The invention discloses a kind of anti-interference driving circuits of USB interface for making USB interface be applied to industrial environment, including：USB interface, USB interface are provided with supply pin, data line positive and negative electrode, device type detection foot and grounding leg, are connected on the supply pin of the USB interface：Filter circuit, anti-circnit NOT and counnter attack post filtering circuit before power supply static release circuit, counnter attack；The data line anode of the USB interface is connected with negative data static release circuit, negative data signal attenuation circuit and negative data signal filter circuit, and the data line anode of the USB interface is connected with：Correction data static release circuit, positive data signal attenuator circuit, positive data signal filter circuit and high-speed communication switching on/off circuit；It is connected on the device type detection foot of the USB interface：Detect signal attenuation circuit, detection signal clamper and filter circuit.The USB interface for using the anti-interference driving circuit can be widely applied in various industrial environments.
Description
Technical field
The present invention relates to a kind of driving of a kind of driving circuit of communication interface more particularly to USB communication interface electricity
Road.
Background technology
With the fast development of today's society electronic technology, the application of microprocessor is more and more extensive, all embedded in interface
Microprocessor so that the function of interface is more and more abundant, moreover, also there are many novel communication interfaces, wherein USB
Interface had become current general one of communication interface already.But when applying it to industrial environment, due under industrial environment
Power-supply fluctuation it is big, electromagnetic radiation is big, interference signal is more etc., and well-known reason, conventional USB interface can not be reliable and stable
Ground works, and especially in high speed transmission data, this phenomenon is particularly evident.
Invention content
The technical problem to be solved by the present invention is to：A kind of USB interface for making USB interface be applied to industrial environment is provided
Anti-interference driving circuit.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of anti-interference driving circuit of USB interface,
Including：USB interface, USB interface are provided with supply pin, a pair of of data pin i.e. data line anode and data line cathode, device type
Foot and grounding leg are detected, the grounding leg of USB interface is grounded, is connected with by power bus on the supply pin of the USB interface：Electricity
Filter circuit and anti-circnit NOT and counnter attack post filtering circuit before source static release circuit, counnter attack, wherein anti-circnit NOT is serially connected in
In power bus, power bus is separated into power bus after power bus before counnter attack and counnter attack, the power supply Electro-static Driven Comb
Filter circuit is attempted by before counnter attack between power bus and ground wire before circuit and counnter attack, and the counnter attack post filtering circuit is attempted by
After counnter attack between power bus and ground wire, filter circuit includes before counnter attack：Low frequency is filtered before high-frequency filter circuit and counnter attack before counnter attack
Wave circuit, the counnter attack post filtering circuit include：Low-frequency filter circuit after high-frequency filter circuit and counnter attack after counnter attack；It is described
The data line cathode of USB interface is connected with by negative data line：Negative data static release circuit, negative data signal attenuation circuit and
Negative data signal filter circuit, wherein negative data signal attenuation circuit is serially connected in negative data line, by the partition of negative data line at declining
Negative data line after subtracting preceding negative data line and decaying, the negative data static release circuit are attempted by negative data line and ground before decaying
Between line, the negative data signal filter circuit is attempted by after decaying between negative data line and ground wire；The number of the USB interface
It is connected with by correction data line according to line anode：Correction data static release circuit, positive data signal attenuator circuit, positive data signal filter
Wave circuit and high-speed communication switching on/off circuit, wherein positive data signal attenuator circuit is serially connected in correction data line, by correction data line
Correction data line is attempted by positive number before decaying with correction data line after decaying, the correction data static release circuit before separating into decaying
According between line and ground wire, the positive data signal filter circuit and high-speed communication switching on/off circuit are attempted by correction data line after decaying
Between ground wire；The positive and negative data-signal filter circuit is high-frequency filter circuit；The high-speed communication switching on/off circuit
Include：The one of first pull down resistor, the second pull down resistor and start and stop driving circuit, the first pull down resistor and the second pull down resistor
End is connected, and the other end of the first pull down resistor is connected to correction data line after decaying, and the other end of the second pull down resistor is grounded, and first
The junction of pull down resistor and the second pull down resistor is connected by the anode of a controllable electronic switch and working power, this is controllable
The control terminal of electronic switch is connected with the start and stop driving circuit；Pass through equipment on the device type detection foot of the USB interface
Detection line is connected with：Detect signal attenuation circuit, detection signal clamper and filter circuit.
As a preferred embodiment, in the anti-interference driving circuit of USB interface, the controllable electronic switch is
PNP type triode, the collector of the triode are connected with the anode of working power, the emitter of triode and the first pull down resistor
It is connected with the junction of the second pull down resistor；It corresponds, the start and stop driving circuit includes：Start and stop driving limit resistance
Pull-up resistor, one end of start and stop driving pull-up resistor is driven to be connected with the anode of working power with start and stop, start and stop driving pull-up electricity
The other end of resistance is connected with the base stage of the triode, the base stage phase of one end and the triode of start and stop driving limit resistance
Even, the other end is connected with the start and stop drive level for controlling the triode break-make.
As a preferred embodiment, in the anti-interference driving circuit of USB interface, the detection signal clamper and
Filter circuit includes：Upper detection divider resistance and lower detection divider resistance, upper detection divider resistance and lower detection divider resistance
One end, which is connected, is used as device type test point, and the device type of the other end and the USB interface of lower detection divider resistance detects
Foot is connected, and the other end of upper detection divider resistance is connected with the anode of working power, and the device type test point passes through one
Clamper and filter capacitor ground connection.
As a preferred embodiment, in the anti-interference driving circuit of USB interface, the anti-circnit NOT includes：P
The source electrode of channel MOS tube, the grounded-grid of P-channel metal-oxide-semiconductor, P-channel metal-oxide-semiconductor is connected with power bus before counnter attack, P-channel MOS
The drain electrode of pipe is connected with power bus after counnter attack.
As a preferred embodiment, in the anti-interference driving circuit of USB interface, the power supply Electro-static Driven Comb electricity
Road is two-way Transient Suppression Diode, and one end of two-way Transient Suppression Diode is connected with the supply pin of the USB interface, another
End ground connection.
As a preferred embodiment, in the anti-interference driving circuit of USB interface, the number with USB interface
A pair of of the data static release circuit being connected with data line cathode according to line anode is made of two-way Transient Suppression Diode array, double
The anode of supply pin and working power to Transient Suppression Diode array is connected, which connects
Lower margin is grounded, a pair of of output pin of the two-way Transient Suppression Diode array respectively with the data line anode of the USB interface and
Data line cathode is connected.
The beneficial effects of the invention are as follows：Anti-interference driving circuit of the present invention has widened the application of USB interface significantly
Occasion so that its can it is big in power-supply fluctuation, electromagnetic radiation is big, reliablely and stablely works under the industrial environment more than interference signal；Especially
It is the introducing of high-speed communication switching on/off circuit, not only ensure that the stability of the waveform in low speed transmissions data, but also is substantially improved
Waveform when high speed transmission data, to which the accuracy rate of data transmission greatly improved.
Description of the drawings
Fig. 1 is the electric theory structure block diagram of the present invention.
Fig. 2 is electric principle assumption diagram corresponding with Fig. 1.
Reference numeral in Fig. 1 is respectively：10, USB interface, 11, power supply static release circuit, 12, filtered electrical before counnter attack
Road, 13, anti-circnit NOT, 14, counnter attack post filtering circuit, 21, negative data static release circuit, 22, negative data signal attenuation circuit,
23, negative data signal filter circuit, 31, correction data static release circuit, 32, positive data signal attenuator circuit, 33, positive number it is believed that
Number filter circuit, 34, high-speed communication switching on/off circuit, 41, detection signal attenuation circuit, 42, detection signal clamper and filter circuit.
Specific implementation mode
Below in conjunction with the accompanying drawings, a kind of specific implementation of the anti-interference driving circuit of USB interface of the present invention is described in detail
Scheme：
As shown in Figure 1, the anti-interference driving circuit of a kind of USB interface of the present invention, including：Usb 10, USB connects
Mouth 10 is provided with supply pin (1 foot), a pair of of data pin i.e. data line positive (3 foot) and data line cathode (2 foot), device type inspection
Foot (4 foot) and grounding leg (5 foot) are surveyed, is connected with by power bus on the supply pin of the usb 10：Power supply Electro-static Driven Comb
Filter circuit 12 and anti-circnit NOT 13 and counnter attack post filtering circuit 14 before circuit 11, counnter attack, wherein anti-circnit NOT 13 concatenates
In power bus, power bus is separated into power bus after power bus before counnter attack and counnter attack, the power supply electrostatic is released
Filter circuit 12 is attempted by before counnter attack between power bus and ground wire before electric discharge road 11 and counnter attack, the counnter attack post filtering circuit
14 are attempted by after counnter attack between power bus and ground wire, and filter circuit includes before the counnter attack：High frequency filter electricity before counnter attack
Low-frequency filter circuit before road and counnter attack, the counnter attack post filtering circuit include：After counnter attack after high-frequency filter circuit and counnter attack
Low-frequency filter circuit；As shown in Fig. 2, the power supply static release circuit 11 is the two-way wink of a model SMBJ5.0CA
State inhibits diode D1, one end of the two-way Transient Suppression Diode D1 to be connected with the supply pin of usb 10, another termination
Ground；Filter circuit includes before the counnter attack：High frequency filter electricity before the counnter attack be made of the polarity free capacitor C2 that capacity is 0.1UF
Road and by low-frequency filter circuit before the counnter attacks that constitute of electrolytic capacitor C3 that capacity is 10UF, the counnter attack post filtering circuit packet
It includes：High-frequency filter circuit and the electrolysis electricity for being 10UF by capacity after the counnter attack that the polarity free capacitor C1 for being 0.1UF by capacity is constituted
Low-frequency filter circuit after the counnter attack that appearance C4 is constituted, the anti-circnit NOT include：The P-channel metal-oxide-semiconductor of model SI2371EDS
Q1, the grounded-grid of P-channel metal-oxide-semiconductor Q1, the source electrode of P-channel metal-oxide-semiconductor Q1 are connected with power bus before counnter attack, P-channel metal-oxide-semiconductor
The drain electrode of Q1 is connected with power bus after counnter attack；The data line cathode (2 foot) of the usb 10 is connected by negative data line
Have：Negative data static release circuit 21, negative data signal attenuation circuit 22 and negative data signal filter circuit 23, wherein negative
It is serially connected in negative data line according to signal attenuation circuit 22, by the partition of negative data line at negative data after negative data line before decaying and decaying
Line, the negative data static release circuit 21 are attempted by before decaying between negative data line and ground wire, the negative data signal
Filter circuit 23 is attempted by after decaying between negative data line and ground wire；The data line of the usb 10 positive (3 foot) is by just
Data line is connected with：Correction data static release circuit 31, positive data signal attenuator circuit 32, positive data signal filter circuit 33 with
And high-speed communication switching on/off circuit 34, wherein positive data signal attenuator circuit 32 is serially connected in correction data line, and correction data line is separated
At correction data line after correction data line before decaying and decaying, correction data static release circuit 31 is attempted by correction data line and ground before decaying
Between line, the positive data signal filter circuit 33 and high-speed communication switching on/off circuit 34 are attempted by correction data line and ground after decaying
Between line；As shown in Fig. 2, the positive and negative data-signal filter circuit is high-frequency filter circuit, respectively by the electrodeless of 22PF
Property capacitance C5 and C6 constitute, i.e.,：Positive data signal filter circuit is made of polarity free capacitor C5, negative data signal filter circuit by
Polarity free capacitor C6 is constituted；The correction data static release circuit 31 and negative data static release circuit 21 is by model
The two-way Transient Suppression Diode battle array IC1 row of NUP2202W1 are constituted, the supply pin of the two-way Transient Suppression Diode array IC1
(5 foot) is connected with the anode of working power, and grounding leg (2 foot) ground connection of the two-way Transient Suppression Diode array IC1, this is two-way
A pair of of output pin (6 feet and 1 foot) of Transient Suppression Diode array IC1 respectively with the data line anode of the usb 10 and
Data line cathode is connected；The positive data signal attenuator circuit 32 is made of the resistance R12 of 20 Europe mother, the negative it is believed that
Number attenuator circuit 22 is made of the resistance R9 of 20 Europe mother；The high-speed communication switching on/off circuit 34 includes：Resistance value is the of 1K
One pull down resistor R2, the second pull down resistor R6 and start and stop driving circuit that resistance value is 10K, the drop-downs of the first pull down resistor R2 and second
One end of resistance R6 is connected, and the other end of the first pull down resistor R2 is connected to correction data line after decaying, the second pull down resistor R6's
The type that controllable electronic switch is used as in the junction of other end ground connection, the first pull down resistor R2 and the second pull down resistor R6 by one
Number for 9012 triode Q2 (PNP type triode) collector and emitter and working power anode connect, triode Q2
Base stage be connected with the start and stop driving circuit, the start and stop driving circuit includes：Start and stop driving limit resistance R5 and start and stop
Pull-up resistor R4, one end of start and stop driving pull-up resistor R4 is driven to be connected with the anode of working power, start and stop drive pull-up resistor
The other end of R4 is connected with the base stage of triode Q2, and one end of start and stop driving limit resistance R5 is connected with the base stage of triode Q2,
The other end of start and stop driving limit resistance R5 is connected with the start and stop drive level for controlling triode Q2 break-makes；The USB connects
It is connected with by equipment detection line on the device type detection foot (5 foot) of mouth 10：Detect signal attenuation circuit, detection signal clamper
And filter circuit；As shown in Fig. 2, the detection signal clamper and filter circuit include：Upper detection divider resistance R1 and lower detection point
Piezoresistance R3, upper detection divider resistance R1 are connected with one end of lower detection divider resistance R3 is used as device type test point, lower inspection
The other end for surveying divider resistance R3 is connected with the device type of the usb 10 detection foot (4 foot), upper detection divider resistance R1
The other end be connected with the anode of working power, the device type test point is used as clamper and the appearance of filter capacitor by one
The polarity free capacitor C7 ground connection that amount is 0.1UF.
In conclusion only presently preferred embodiments of the present invention, is not used for limiting the scope of implementation of the present invention, it is all according to
Equivalent changes and modifications made by shape, construction, feature and spirit described in scope of the invention as claimed should all be included in this
In the right of invention.
Claims (4)
1. a kind of anti-interference driving circuit of USB interface, including：USB interface, USB interface are provided with supply pin, a pair of of data pin i.e.
Data line anode and data line cathode, device type detection foot and grounding leg, the grounding leg ground connection of USB interface, which is characterized in that
It is connected with by power bus on the supply pin of the USB interface：Filter circuit and anti-before power supply static release circuit, counnter attack
Circnit NOT and counnter attack post filtering circuit, wherein anti-circnit NOT is serially connected in power bus, by power bus partition at electric before counnter attack
Power bus after source bus and counnter attack, filter circuit is attempted by power supply before counnter attack before the power supply static release circuit and counnter attack
Between bus and ground wire, the counnter attack post filtering circuit is attempted by after counnter attack between power bus and ground wire, is filtered before counnter attack
Circuit includes：Low-frequency filter circuit, the counnter attack post filtering circuit include before high-frequency filter circuit and counnter attack before counnter attack：Counnter attack
Low-frequency filter circuit after high-frequency filter circuit and counnter attack afterwards；The data line cathode of the USB interface is connected with by negative data line：
Negative data static release circuit, negative data signal attenuation circuit and negative data signal filter circuit, wherein negative data signal is decayed
Circuit is serially connected in negative data line, and by the partition of negative data line at negative data line after negative data line before decaying and decaying, described is negative
Data static release circuit is attempted by before decaying between negative data line and ground wire, and the negative data signal filter circuit is attempted by
After decaying between negative data line and ground wire；The data line anode of the USB interface is connected with by correction data line：Correction data electrostatic
Release circuit, positive data signal attenuator circuit, positive data signal filter circuit and high-speed communication switching on/off circuit, wherein positive number
It is serially connected in correction data line according to signal attenuation circuit, by the partition of correction data line at correction data after correction data line before decaying and decaying
Line, the correction data static release circuit are attempted by before decaying between correction data line and ground wire, positive data signal filter
Wave circuit and high-speed communication switching on/off circuit are attempted by after decaying between correction data line and ground wire；The positive and negative data-signal filter
Wave circuit is high-frequency filter circuit；The high-speed communication switching on/off circuit includes：First pull down resistor, the second pull down resistor
With start and stop driving circuit, one end of the first pull down resistor and the second pull down resistor is connected, the other end connection of the first pull down resistor
Correction data line after to decaying, the other end ground connection of the second pull down resistor, the junction of the first pull down resistor and the second pull down resistor
It is connected by the anode of a controllable electronic switch and working power, the control terminal of the controllable electronic switch drives with the start and stop
Circuit is connected；It is connected with by equipment detection line on the device type detection foot of the USB interface：Detection signal attenuation circuit,
Detect signal clamper and filter circuit；The controllable electronic switch is PNP type triode, the collector of the triode and work
The anode of power supply is connected, and the emitter of triode is connected with the junction of the first pull down resistor and the second pull down resistor；Phase therewith
Corresponding, the start and stop driving circuit includes：Start and stop driving limit resistance and start and stop drive pull-up resistor, start and stop driving pull-up electricity
One end of resistance is connected with the anode of working power, and the other end of start and stop driving pull-up resistor is connected with the base stage of the triode,
Start and stop driving limit resistance one end be connected with the base stage of the triode, the other end and be used for control the triode break-make
Start and stop drive level is connected；The detection signal clamper and filter circuit include：Upper detection divider resistance and lower detection partial pressure
Resistance, upper detection divider resistance is connected with one end of lower detection divider resistance is used as device type test point, lower detection partial pressure electricity
The other end of resistance is connected with the device type of USB interface detection foot, the other end and working power of upper detection divider resistance
Anode be connected, the device type test point pass through a clamper and filter capacitor ground connection.
2. the anti-interference driving circuit of USB interface as described in claim 1, it is characterised in that：The anti-circnit NOT includes：P
The source electrode of channel MOS tube, the grounded-grid of P-channel metal-oxide-semiconductor, P-channel metal-oxide-semiconductor is connected with power bus before counnter attack, P-channel MOS
The drain electrode of pipe is connected with power bus after counnter attack.
3. the anti-interference driving circuit of USB interface as claimed in claim 1 or 2, it is characterised in that：The power supply Electro-static Driven Comb
Circuit is two-way Transient Suppression Diode, and one end of two-way Transient Suppression Diode is connected with the supply pin of the USB interface, separately
One end is grounded.
4. the anti-interference driving circuit of USB interface as claimed in claim 1 or 2, it is characterised in that：It is described with USB interface
A pair of of data static release circuit that data line anode is connected with data line cathode is made of two-way Transient Suppression Diode array,
The supply pin of the two-way Transient Suppression Diode array is connected with the anode of working power, the two-way Transient Suppression Diode array
Grounding leg ground connection, a pair of of output pin of the two-way Transient Suppression Diode array respectively with the data line of the USB interface just
Pole is connected with data line cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510702614.9A CN105404603B (en) | 2015-10-26 | 2015-10-26 | A kind of anti-interference driving circuit of USB interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510702614.9A CN105404603B (en) | 2015-10-26 | 2015-10-26 | A kind of anti-interference driving circuit of USB interface |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105404603A CN105404603A (en) | 2016-03-16 |
| CN105404603B true CN105404603B (en) | 2018-10-09 |
Family
ID=55470098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510702614.9A Active CN105404603B (en) | 2015-10-26 | 2015-10-26 | A kind of anti-interference driving circuit of USB interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105404603B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183605B (en) * | 2018-01-02 | 2020-12-08 | 深圳市智行畅联科技有限公司 | Anti-conductivity interference circuit for vehicle-mounted primary power supply |
| CN110825682B (en) * | 2019-11-05 | 2022-08-02 | 维沃移动通信有限公司 | USB control method and electronic equipment |
| CN111159068B (en) * | 2019-12-30 | 2022-04-22 | 联想(北京)有限公司 | Information processing method and electronic device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2643382Y (en) * | 2003-06-05 | 2004-09-22 | 同星实业股份有限公司 | USB interface identifier |
| CN201837990U (en) * | 2010-10-22 | 2011-05-18 | 华为终端有限公司 | Detection circuit and mobile terminal |
| CN202631999U (en) * | 2012-04-20 | 2012-12-26 | 上海蓝钥智能科技有限公司 | Lower computer system based on USB interface board card |
| CN104135148A (en) * | 2014-07-17 | 2014-11-05 | 青岛歌尔声学科技有限公司 | USB (Universal Serial Bus) interface circuit |
| CN204314872U (en) * | 2014-12-30 | 2015-05-06 | 浙江海利普电子科技有限公司 | Adapter |
| CN204316137U (en) * | 2014-12-30 | 2015-05-06 | 德尔福中央电气（上海）有限公司 | A kind of vehicle-mounted double-H groove weld SB charger |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7671630B2 (en) * | 2005-07-29 | 2010-03-02 | Synopsys, Inc. | USB 2.0 HS voltage-mode transmitter with tuned termination resistance |
-
2015
- 2015-10-26 CN CN201510702614.9A patent/CN105404603B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2643382Y (en) * | 2003-06-05 | 2004-09-22 | 同星实业股份有限公司 | USB interface identifier |
| CN201837990U (en) * | 2010-10-22 | 2011-05-18 | 华为终端有限公司 | Detection circuit and mobile terminal |
| CN202631999U (en) * | 2012-04-20 | 2012-12-26 | 上海蓝钥智能科技有限公司 | Lower computer system based on USB interface board card |
| CN104135148A (en) * | 2014-07-17 | 2014-11-05 | 青岛歌尔声学科技有限公司 | USB (Universal Serial Bus) interface circuit |
| CN204314872U (en) * | 2014-12-30 | 2015-05-06 | 浙江海利普电子科技有限公司 | Adapter |
| CN204316137U (en) * | 2014-12-30 | 2015-05-06 | 德尔福中央电气（上海）有限公司 | A kind of vehicle-mounted double-H groove weld SB charger |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105404603A (en) | 2016-03-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105404603B (en) | A kind of anti-interference driving circuit of USB interface | |
| CN202583311U (en) | Alternating current zero-crossing detection circuit | |
| CN102890184A (en) | Zero-crossing detection circuit based on optocoupler | |
| CN103390878A (en) | Lamp power output overvoltage protection circuit and lamp | |
| CN103414332A (en) | Fault detection and control circuit, method and system for power supply chip | |
| CN201892702U (en) | Zero cross detection circuit | |
| CN203759106U (en) | Commercial power zero cross detection circuit | |
| CN105356437B (en) | A kind of anti-surge circuit | |
| CN204189161U (en) | A kind of hot plug-pull control system | |
| CN107979362A (en) | A kind of circuit system and power device Drive Protecting Circuit | |
| CN207037594U (en) | A kind of equipment for realizing Auto Power On | |
| CN206147508U (en) | Reset circuit and intelligent system | |
| CN203504786U (en) | Electromagnetic heating control circuit and electric pressure cooker | |
| CN202995351U (en) | Buzzer and switch-assembly multiplexing system | |
| CN204789859U (en) | Mutual -inductor state detection circuitry | |
| CN103076512A (en) | Switching value detection circuit | |
| CN209151406U (en) | The protection circuit of low ripple LED control device | |
| CN209041081U (en) | A kind of protection circuit of air compressor machine long-distance monitorng device | |
| CN202488111U (en) | Overcurrent detection and protection device for inverter | |
| CN203301380U (en) | An AC null line and live wire intelligent identifying and converting circuit | |
| CN105911904A (en) | Touch switch device circuit, control circuit and control method | |
| CN202435347U (en) | Control circuit for restricting carrier wave transmission by controlling voltage | |
| CN202918402U (en) | Circuit reset system of television set | |
| CN202773148U (en) | Backlight LED driving protective circuit under 3D state and television set | |
| CN202488417U (en) | Anti-jamming protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |