CN109039084A - A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit - Google Patents
A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit Download PDFInfo
- Publication number
- CN109039084A CN109039084A CN201810825698.9A CN201810825698A CN109039084A CN 109039084 A CN109039084 A CN 109039084A CN 201810825698 A CN201810825698 A CN 201810825698A CN 109039084 A CN109039084 A CN 109039084A
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- Prior art keywords
- power
- liquid crystal
- crystal instrument
- voltage
- module
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 54
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 37
- 238000002955 isolation Methods 0.000 claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims description 24
- 230000005764 inhibitory process Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000013500 data storage Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit, which is specifically included: the first Voltage stabilizing module, for carrying out pressure stabilizing to Battery power circuit；Second Voltage stabilizing module, for carrying out pressure stabilizing to IGN signal；Power supply logics control module, for controlling the output of the IGN signal voltage after two-way enable signal voltage and pressure stabilizing；Isolation module, for Battery power circuit and power end to be isolated；Filter module, for being filtered to the voltage that isolation module exports.Cost is relatively low, result is simple for liquid crystal instrument for automobile bootstrapping power-supplying circuit of the invention, the common mode interference of power end can be substantially improved, and the present invention, after the disconnection of IGN signal, control enable signal exports high level, so that liquid crystal instrument is still maintained at 12V power voltage supply state.
Description
Technical field
The present invention relates to control system technical field more particularly to a kind of liquid crystal instrument for automobile bootstrapping power-supplying circuits.
Background technique
Liquid crystal instrument for automobile refers to that tradition machinery instrument, which is substituted for LCD screen, shows vehicle traveling information to driver
Equipment, eliminate traditional physical indicator, all show that its advantages are not only only capable of being communicated to driver by electronic curtain
Tradition machinery is so as to essential informations such as the Vehicle Speed of displaying, transmitter revolving speed, Fuel Oil Remainings, moreover it is possible to make display effect more
Good gorgeous, realization personal settings, display content are richer.
Traditional liquid crystal instrument electrifying control circuit is made of two-way circuit, is IGN sample circuit and Battery respectively
Power circuit.As shown in Figure 1, traditional liquid crystal instrument electrifying control circuit successively includes switching diode, inhibits diode, is total
Mould inductance, inductance, divider resistance, BAV99, electrolytic capacitor.IGN signal is then protected always as sampled signal, Battery among these
It holds in 12V or so.With vapour instrument towards liquid-crystalize, the direction of virtualization is developed, as shown in Figure 2 in order to realize liquid crystal instrument
Power supply power supply and the work mould interference for improving power supply power supply generation, Battery and IGN signal are needed by switching diode pressure stabilizing,
Common mode inductance improves common mode interference, inductance and electrolytic capacitor filtering, divider resistance partial pressure, although to a certain degree after improving
On improve the common mode interference of power supply power supply generation, but use common mode inductance to make circuit in liquid crystal instrument electrifying control circuit
It is at high cost, and can not effectively improve the common mode interference of power end.
The patent of Publication No. CN 103400556A discloses a kind of liquid crystal instrument circuit of electric automobile, including terminals
Mouth, power circuit, current amplification circuit, system processor, data storage, backlight luminescence plate, liquid crystal display drive IC, liquid crystal
Display screen, external tapping isolation optocoupler, reset circuit, crystal oscillating circuit and buzzer circuit；The system processor respectively with power supply
Circuit, current amplification circuit, data storage, liquid crystal display driving IC, external tapping isolation optocoupler, reset circuit, crystal oscillating circuit with
And buzzer circuit is connected；The Wiring port connects external tapping isolation optocoupler；The liquid crystal display connection liquid crystal display drives
Dynamic IC, the backlight luminescence plate are combined with liquid crystal display.The present invention shows all operation contents by full liquid crystal display, beautiful
Intuition；Supply voltage is not selected, 20V to 100V can be with the work of normal table；Low energy consumption, and consumption electric energy is machinery instrument
1/3 or less；And have the function of parking alarm and undervoltage warning.Liquid crystal instrument power circuit in the program does not do any
The processing for eliminating common mode interference, is unable to improve the common mode interference of power end.
Summary of the invention
Liquid crystal instrument electrifying control circuit is at high cost, component is complicated in order to solve by the present invention, can not be effectively improved common mode
The problem of interference, providing one kind, cost is relatively low, result is simple, and can substantially improve the liquid crystal instrument bootstrapping of common mode interference
Power-supplying circuit.
In order to achieve the goal above, the invention adopts the following technical scheme:
A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit, comprising:
First Voltage stabilizing module, for carrying out pressure stabilizing to Battery power circuit；
Second Voltage stabilizing module, for carrying out pressure stabilizing to IGN signal；
Power supply logics control module, for controlling the output of the IGN signal voltage after two-way enable signal voltage and pressure stabilizing；
Isolation module, for Battery power circuit and power end to be isolated；
Filter module, for being filtered to the voltage that isolation module exports.
Further, first Voltage stabilizing module include switching diode and inhibit diode, the switching diode with
The inhibition diodes in parallel.
Further, second Voltage stabilizing module includes a switching diode and two patch capacitors, one to open
It is in parallel with described two patch capacitors to close diode.
Further, described for circuit Logic control module includes current-limiting resistance, NPN type triode, pull down resistor and two
The anode of a switching diode, described two switching diodes is connected with the two-way enable signal respectively, described two switches
It connects after diode is in parallel with the pull down resistor with the current-limiting resistance, 1 foot of the NPN type triode connects the current limliting
Resistance, 2 feet ground connection, 3 feet are connected to the isolation module.
Further, the two-way enable signal is provided by MCU or CAN transceiver.
Further, the duration of the two-way enable signal voltage output is controlled by MCU.
Further, the isolation module includes P-Mos pipe and pull-up resistor, and 1 foot of the P-Mos pipe connects on described
2 feet of 3 feet of one end of pull-up resistor and the NPN type triode, the P-Mos pipe connect the another of the pull-up resistor
End, 3 feet of the P-Mos pipe are connected to the filter module.
Further, the filter module includes an electrolytic capacitor and two patch capacitors, the electrolytic capacitor and patch
Chip capacitor is in parallel.
Compared with prior art, the invention has the following advantages that
(1) liquid crystal instrument of the invention is booted power-supplying circuit because eliminating inductance and common mode inductance, at
This significant decrease, and route result is also simplified.
(2) present invention by IGN signal and Battery power circuit become with after logic all the way only when there is IGN signal
The 12V voltage that Battery power circuit provides could be managed by P-Mos, and whole liquid crystal just has 12V together, is managed by P-Mos
The common mode interference that can effectively improve power end after being isolated is done.
(3) invention increases after two-way enable signal, after the disconnection of IGN signal, control enable signal exports high level,
Making liquid crystal instrument still may remain in 12V power voltage supply, therefore liquid crystal instrument still can be in low-power consumption mode by the present invention
Work.
Detailed description of the invention
Fig. 1 is traditional liquid crystal instrument electrifying control circuit a kind of in the prior art provided by the invention；
Fig. 2 is traditional liquid crystal instrument electrifying control circuit another in the prior art provided by the invention；
A kind of Fig. 3 liquid crystal instrument for automobile bootstrapping power-supplying circuit provided by the invention.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.It should be noted that in the absence of conflict, following embodiment and implementation
Feature in example can be combined with each other.
It should be noted that illustrating the basic structure that only the invention is illustrated in a schematic way provided in following embodiment
Think, only shown in schema then with related component in the present invention rather than component count, shape and size when according to actual implementation
Draw, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its assembly layout kenel
It is likely more complexity.
With reference to the accompanying drawing and embodiment, the present invention will be described in further detail, it should be understood that the tool of this description
Body embodiment is used only for explaining the present invention, is not intended to limit the present invention.
As shown in figure 3, the invention discloses a kind of liquid crystal instrument for automobile bootstrapping power-supplying circuits, comprising:
First Voltage stabilizing module, for carrying out pressure stabilizing to Battery power circuit.
Specifically, first Voltage stabilizing module includes switching diode and inhibits diode, the switching diode and institute
Inhibition diodes in parallel is stated, as shown in figure 3, it is described first that D4, which is switching diode, the D5 of first Voltage stabilizing module, in figure
The inhibition diode of Voltage stabilizing module can be very good to carry out pressure stabilizing to Battery power circuit by the two parallel connection, guarantee circuit
It works normally.
Second Voltage stabilizing module, for carrying out pressure stabilizing to IGN signal.
Specifically, second Voltage stabilizing module includes a switching diode and two patch capacitors, one switch
Diode is in parallel with described two patch capacitors, as shown in figure 3, in figure D7 be second Voltage stabilizing module switching diode,
C14 and C15 is the patch capacitor of second Voltage stabilizing module, and the pressure stabilizing to IGN signal may be implemented.
Power supply logics control module, for controlling the output of the IGN signal voltage after two-way enable signal voltage and pressure stabilizing.
Specifically, the two-way enable signal is provided by MCU or CAN transceiver, so that after the disconnection of IGN signal, MCU
Or CAN transceiver control MCU_BAT enable signal exports high level, makes liquid crystal instrument still and may remain in the confession of 12V voltage
Electricity, so liquid crystal instrument still can work in low-power consumption mode.
It should be noted that enable signal similar to a trigger signal, is to guarantee circuit or proper device operation
Switching signal, two-way enable signal is arranged in the present invention can be after the disconnection of IGN signal, the still normal work of holding circuit,
Liquid crystal instrument still may remain in 12V power voltage supply in this way.Enable signal of the invention can by MCU (micro-control unit,
Microcontroller Unit), also known as single-chip microcontroller provides, and can also be provided by CAN transceiver.
It for circuit Logic control module include current-limiting resistance, NPN type triode, pull down resistor and two specifically, described
The anode of switching diode, described two switching diodes is connected with the two-way enable signal respectively, described two switches two
It connects after pole pipe is in parallel with the pull down resistor with the current-limiting resistance, 1 foot of the NPN type triode connects the current limliting electricity
Resistance, 2 feet ground connection, 3 feet are connected to the isolation module, as shown in figure 3, D3 and D8 is respectively the power supply logics control mould in figure
Two switching diodes of block, the anode connection MCU_BAT enable signal of D3, the anode connection CANO_INH enable signal of D8,
R5 is the pull down resistor of the power supply logics control module, and R7 is that current-limiting resistance, the Q1 of the power supply logics control module are institute
The NPN type triode of power supply logics control module is stated, the 1 foot connection R7 of Q1 is connected through the IGN after the second voltage regulator circuit pressure stabilizing
Signal and the two-way enable signal for passing through switching diode, the 2 feet ground connection of Q1,3 feet of Q1 are connected to isolation module, such Q1
The output of IGN signal voltage after two-way enable signal voltage and pressure stabilizing can be controlled.
Specifically, the duration of the two-way enable signal voltage output is controlled by MCU, liquid crystal instrument thus can control
The table duration that liquid crystal instrument works in low-power consumption mode.
Isolation module, for Battery power circuit and power end to be isolated.
Specifically, the isolation module includes P-Mos pipe and pull-up resistor, 1 foot of the P-Mos pipe connects the pull-up
2 feet of 3 feet of one end of resistance and the NPN type triode, the P-Mos pipe connect the other end of the pull-up resistor,
3 feet of the P-Mos pipe are connected to the filter module, as shown in figure 3, Q76 is that the P-Mos of the isolation module is managed in figure,
R15 be the isolation module pull-up resistor, Q76 1 foot connection power supply logics control module in NPN type triode 3 feet with
And one end of R15, the other end and the Battery power circuit after the first Voltage stabilizing module pressure stabilizing of the 2 feet connection R15 of Q76
Output end, so only when having IGN signal or two-way enable signal, Q76 could be connected, and just be had on liquid crystal instrument
12V voltage thus can effectively improve the common mode interference of power end.
Filter module, for being filtered to the voltage that isolation module exports.
Specifically, the filter module includes an electrolytic capacitor and two patch capacitors, the electrolytic capacitor and patch
Capacitor is in parallel, as shown in figure 3, C598 is the electrolytic capacitor of the filter module in figure, C5 and C6 are the patch of the filter module
Chip capacitor, three capacitors form filter module, can effectively filter out the alternating component in circuit, keep the direct current of output more flat
It is sliding.
The working principle of the invention is described in detail below:
For automobile when inactive, Battery power circuit can be maintained at always 12V or so, but at this time because there is no IGN
Signal and two-way enable signal, P-Mos is managed and (Q76) and is not turned at this time, so at this time on liquid crystal instrument there is no 12V voltage,
Car key is gone into ING ON (engine is opened in starting) state at this moment, IGN signal will be generated at this time then by switch
Diode (D7) and current-limiting resistance (R7), and the voltage of 0.7V, at this time NPN type can be formed in 1 foot of NPN type triode (Q1)
2 feet of triode (Q1) and the conducting of 3 feet, and 1 foot (G point) of P-Mos pipe (Q76) is pulled down into ground, it is formed at 1 foot (G point) low
Level, P-Mos, which manages 2 feet (S point) of (Q76) and 3 feet (D point) conducting, the voltage of Battery power circuit, at this time can pass through P-
Mos pipe (Q76) then becomes VCC_12V0 after filter module, and liquid crystal instrument just has the power supply of 12V voltage at this time.
In vehicle stall, car key goes to ING OFF (flame-out) state, at this time because of 1 foot of NPN type triode (Q1)
There is no high level, so 2 feet and 3 feet of NPN type triode (Q1) can not be connected, 1 foot (G point) that P-Mos manages (Q76) can not shape
At low level, therefore 2 feet (S point) of P-Mos pipe (Q76) and 3 feet (D point) can not be connected, and Battery power circuit can not at this time
It powers to liquid crystal instrument.
If needing 12V to power in ING OFF (flame-out) state, at this time MCU can control MCU_BAT this all the way enable letter
Number output high level, 1 foot of NPN type triode (Q1) generates high level at this time, and 2 feet and 3 feet of NPN type triode (Q1) lead
Logical, 1 foot (G point) that P-Mos manages (Q76) forms low level, therefore 2 feet (S point) of P-Mos pipe (Q76) and 3 feet (D point) conducting,
Battery power circuit continues as liquid crystal instrument and provides 12V power supply at this time, and power-on time and opportunity are determined by MCU.
Because there is P-Mos pipe (Q76), common mode interference says goodbye to 2 feet (S point) that gear manages (Q76) in P-Mos, can not
Interference is generated to liquid crystal instrument subsequent conditioning circuit.
Liquid crystal instrument bootstrapping power-supplying circuit of the invention, because eliminating inductance and common mode inductance, in cost
It significantly reduces, and route result is also simplified, and IGN signal and Battery power circuit is become with after logic all the way
The 12V voltage that only Battery power circuit provides when there is IGN signal could be managed by P-Mos, and whole liquid crystal just can together
There is 12V, can effectively improve the common mode interference of power end after having done isolation by P-Mos pipe, and increase two-way
After enable signal, after the disconnection of IGN signal, control enable signal exports high level, and liquid crystal instrument is made still to may remain in 12V
Power voltage supply, therefore present invention liquid crystal instrument in low-power consumption mode still can work.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (8)
- The power-supplying circuit 1. a kind of liquid crystal instrument for automobile is booted characterized by comprisingFirst Voltage stabilizing module, for carrying out pressure stabilizing to Battery power circuit；Second Voltage stabilizing module, for carrying out pressure stabilizing to IGN signal；Power supply logics control module, for controlling the output of the IGN signal voltage after two-way enable signal voltage and pressure stabilizing；Isolation module, for Battery power circuit and power end to be isolated；Filter module, for being filtered to the voltage that isolation module exports.
- The power-supplying circuit 2. a kind of liquid crystal instrument for automobile according to claim 1 is booted, which is characterized in that described first Voltage stabilizing module includes switching diode and inhibits diode, the switching diode and the inhibition diodes in parallel.
- The power-supplying circuit 3. a kind of liquid crystal instrument for automobile according to claim 1 is booted, which is characterized in that described second Voltage stabilizing module includes a switching diode and two patch capacitors, one switching diode and described two patch capacitors It is in parallel.
- The power-supplying circuit 4. a kind of liquid crystal instrument for automobile according to claim 1 is booted, which is characterized in that the power supply Road Logic control module includes current-limiting resistance, NPN type triode, pull down resistor and two switching diodes, described two switches The anode of diode is connected with the two-way enable signal respectively, after described two switching diodes are in parallel with the pull down resistor It connects with the current-limiting resistance, 1 foot of the NPN type triode connects the current-limiting resistance, 2 feet ground connection, and 3 feet are connected to described Isolation module.
- The power-supplying circuit 5. a kind of liquid crystal instrument for automobile according to claim 1 is booted, which is characterized in that the two-way Enable signal is provided by MCU or CAN transceiver.
- The power-supplying circuit 6. a kind of liquid crystal instrument for automobile according to claim 5 is booted, which is characterized in that the two-way The duration of enable signal voltage output is controlled by MCU.
- The power-supplying circuit 7. a kind of liquid crystal instrument for automobile according to claim 4 is booted, which is characterized in that the isolation Module include P-Mos pipe and pull-up resistor, 1 foot of the P-Mos pipe connect the pull-up resistor one end and the NPN type 3 feet of triode, 2 feet of the P-Mos pipe connect the other end of the pull-up resistor, and 3 feet of the P-Mos pipe are connected to institute State filter module.
- The power-supplying circuit 8. a kind of liquid crystal instrument for automobile according to claim 1 is booted, which is characterized in that the filtering Module includes that an electrolytic capacitor and two patch capacitors, the electrolytic capacitor are in parallel with patch capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810825698.9A CN109039084A (en) | 2018-07-25 | 2018-07-25 | A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810825698.9A CN109039084A (en) | 2018-07-25 | 2018-07-25 | A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109039084A true CN109039084A (en) | 2018-12-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810825698.9A Pending CN109039084A (en) | 2018-07-25 | 2018-07-25 | A kind of liquid crystal instrument for automobile bootstrapping power-supplying circuit |
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| CN (1) | CN109039084A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110920392A (en) * | 2019-11-19 | 2020-03-27 | 珠海格力电器股份有限公司 | Power supply control circuit, power supply control method and new energy automobile |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202463589U (en) * | 2012-01-22 | 2012-10-03 | 东风襄樊仪表系统有限公司 | Low-cost economical automotive electronic combined instrument |
| CN204257178U (en) * | 2014-10-13 | 2015-04-08 | 国网山东省电力公司青岛供电公司 | LCD backlight ON-OFF control circuit |
-
2018
- 2018-07-25 CN CN201810825698.9A patent/CN109039084A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202463589U (en) * | 2012-01-22 | 2012-10-03 | 东风襄樊仪表系统有限公司 | Low-cost economical automotive electronic combined instrument |
| CN204257178U (en) * | 2014-10-13 | 2015-04-08 | 国网山东省电力公司青岛供电公司 | LCD backlight ON-OFF control circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110920392A (en) * | 2019-11-19 | 2020-03-27 | 珠海格力电器股份有限公司 | Power supply control circuit, power supply control method and new energy automobile |
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Application publication date: 20181218 |