CN108924997A - A kind of second level light adjustment circuit - Google Patents
A kind of second level light adjustment circuit Download PDFInfo
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- CN108924997A CN108924997A CN201810729699.3A CN201810729699A CN108924997A CN 108924997 A CN108924997 A CN 108924997A CN 201810729699 A CN201810729699 A CN 201810729699A CN 108924997 A CN108924997 A CN 108924997A
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- circuit
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- signal
- triode
- power supply
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
Abstract
The present invention relates to LED light regulating technology fields, specifically disclose a kind of second level light adjustment circuit, including MCU, the MCU is equipped with power supply enable end (P) and brightness adjustment control end (S), further includes light modulation output sub-circuit (3) brightness adjustment control sub-circuit (2) power supply control sub-circuit (1).A kind of second level light adjustment circuit provided by the invention, different night pwm signal or pwm signal on daytime, which are exported, by the triode driving effect of brightness adjustment control sub-circuit and the control action of MCU carries out the light modulation of LED, and pass through the pressure stabilization function of pressure stabilizing sub-circuit, prevent light modulation output sub-circuit brownout in low pressure, MCU appearance is effectively improved to the correct judgment of LED state, reliability, the stability of circuit are improved, so that the second level light adjustment to LED light is accurate in place；The lamplight brightness of LED can make further adjustment according to the requirement of user of service in the present invention, and more humane, the scope of application is wider.
Description
Technical field
The present invention relates to LED light regulating technology field more particularly to a kind of second level light adjustment circuits.
Background technique
Automotive electronics is increasingly stringenter the lighting demand of air-conditioner controller at present, due to LED lamplight according to daylight not
With day mode and night mode this second level light is equipped with, the display brightness of LED light is adjusted by exporting single pwm signal,
The state (off state, short-circuit condition and normal operating conditions) of LED light is unstable, be easy to cause MCU occur wrong diagnosis again into
One step feeds back the pwm signal to output, vicious circle occurs, and LED light is caused to show entanglement.
Summary of the invention
The technical issues of present invention provides a kind of second level light adjustment circuit, solution, it is existing to be believed by exporting single PWM
Number adjust LED light display brightness, be easy to cause MCU occur wrong diagnosis further feed back to export pwm signal, dislike
Property circulation, cause LED light show entanglement.
In order to solve the above technical problems, the present invention provides a kind of second level light adjustment circuit, including MCU, and the MCU is equipped with
Power supply enable end and brightness adjustment control end；
It further include the power supply control sub-circuit for accessing power supply signal and connecting the power supply enable end, it is described for receiving
Be switched on or switched off control signal and the power supply signal of MCU exports power supply signal from the power output end of itself or blocks letter
Number；
It further include the brightness adjustment control sub-circuit for connecting the brightness adjustment control end and the power output end, for according to reception
The power supply signal and the dimming control signal of the MCU export night dim signal or daytime from the light modulation output end of itself
Dim signal；It is exported alternatively, being separated according to the disabling signal；
It further include light modulation output for connecting the light modulation output end of the power output end and the brightness adjustment control sub-circuit
Circuit, for the night dim signal based on the received and dim signal on daytime output night pwm signal or PWM on daytime letter
Number；It is exported alternatively, being separated according to the disabling signal.
Preferably, the brightness adjustment control sub-circuit includes triode drive sub-circuits and pressure stabilizing sub-circuit, the triode
The input terminal and output end of drive sub-circuits are separately connected the driving input terminal at the brightness adjustment control end and the pressure stabilizing sub-circuit,
The energization input and output end of pressure-stabilizing of the pressure stabilizing sub-circuit are separately connected the power output end and light modulation output
The pwm signal input terminal of circuit.
Preferably, the triode drive sub-circuits include first resistor and the first triode；The one of the first resistor
The input terminal of end namely the triode drive sub-circuits connects the brightness adjustment control end, and the other end connects first triode
Base stage；The emitter of first triode is grounded, the output end connection of collector namely the triode drive sub-circuits
The driving input terminal of the pressure stabilizing sub-circuit.
Preferably, the pressure stabilizing sub-circuit includes zener diode and second resistance；The positive terminal of the zener diode
The collector of first triode is connected, negative pole end connects one end of the second resistance；The other end of the second resistance
Connect the power output end；The zener diode connects light modulation output with the common connection end of the second resistance
The pwm signal input terminal of circuit.
Preferably, power supply control sub-circuit include 3rd resistor, the 4th resistance, the 5th resistance, the second triode and
Third transistor；One end of the 3rd resistor connects the power supply enable end, and the other end connects the base of second triode
Pole；The emitter of second triode is grounded, and collector connects one end that the 5th resistance is connected after the 4th resistance
With the common connection end of the base stage of the third transistor, the other end of the third transistor emitter and the 5th resistance
Access the power supply signal, the collector of the third transistor namely the power output end.
Preferably, the light modulation output sub-circuit includes the 4th triode；Base stage, that is, PWM of 4th triode
Signal input part, collector connect the power output end, emitter as light modulation output end export the night pwm signal or
Daytime pwm signal.
Preferably, the driving input terminal of the light modulation external LED illuminating circuit of output end, the shape of the LED illuminating circuit
State monitoring side connects the MCU, and the MCU is according to former control information and the LED state information at the status monitoring end from described
Power supply enable end, which issues the connection control signal and the dimming control signal or issues the disconnection, controls signal.
Specifically, the LED state information is one of off state, short-circuit condition and normal operating conditions.
Preferably, the MCU is the MCU of on-board air conditioner controller.
A kind of second level light adjustment circuit provided by the invention, by the triode driving effect of brightness adjustment control sub-circuit and
The control action of MCU exports different night pwm signal or pwm signal on daytime and carries out the light modulation of LED, and passes through pressure stabilizing son electricity
The pressure stabilization function on road prevents light modulation output sub-circuit brownout in low pressure, effectively improves MCU and occur to LED state
Correct judgment improves reliability, the stability of circuit, so that the second level light adjustment to LED light is accurate in place；
The lamplight brightness of LED can make further adjustment according to the requirement of user of service in the present invention, more humane, fit
It is wider with range.
Detailed description of the invention
Fig. 1 is a kind of electrical connection diagram of second level light adjustment circuit provided in an embodiment of the present invention.
Specific embodiment
Embodiments of the present invention are specifically illustrated with reference to the accompanying drawing, embodiment is only given for illustrative purposes,
It can not be interpreted as limitation of the invention, type selecting and value size and attached drawing including component are only preferred embodiment, only
For reference with illustrate use, the limitation to the invention patent protection scope is not constituted, because not departing from spirit of that invention and model
On the basis of enclosing, many changes can be carried out to the present invention.
A kind of functional block diagram for second level light adjustment circuit that inventive embodiments provide, as shown in Figure 1.In the present embodiment
In, a kind of second level light adjustment circuit includes MCU, and the MCU is equipped with power supply enable end P and brightness adjustment control end S, as
One preferred embodiment, the MCU are the MCU of on-board air conditioner controller；
A kind of second level light adjustment circuit further includes access power supply signal VCC and the connection power supply enable end P
Power supply control sub-circuit 1, for receive the MCU be switched on or switched off control signal and the power supply signal VCC from itself
Power output end P1 output power supply signal or disabling signal；
And the brightness adjustment control sub-circuit 2 of the brightness adjustment control end S and the power output end P1 are connected, it is used for basis
The dimming control signal of the received power supply signal and the MCU are dimmed from the brightness adjustment control output end S1 of itself output night
Signal or dim signal on daytime；It is exported alternatively, being separated according to the disabling signal；
And connect the tune of the brightness adjustment control output end S1 of the power output end P1 and the brightness adjustment control sub-circuit 2
Light output sub-circuit 3 exports night pwm signal or white for the night dim signal based on the received and dim signal on daytime
Its pwm signal；It is exported alternatively, being separated according to the disabling signal.
When the power supply enable end P of the MCU exports high level (logical value 1), the power supply signal VCC starts
Power supply, if opposite output is low level (logical value 0), the power supply signal VCC stops power supply.The power supply signal VCC
It powers in normal situation, when the brightness adjustment control end S of the MCU exports high level, into night mode, the light modulation
It exports sub-circuit 3 and exports night pwm signal.When the brightness adjustment control end S of the MCU exports low level, into mould on daytime
Formula, the light modulation output sub-circuit 3 export night pwm signal.
As a preferred embodiment, in Fig. 1, the brightness adjustment control sub-circuit 2 includes triode drive sub-circuits
21 and pressure stabilizing sub-circuit 22, the input terminal and output end of the triode drive sub-circuits 21 be separately connected the brightness adjustment control end
The driving input terminal of S and the pressure stabilizing sub-circuit 22, energization input and the output end of pressure-stabilizing difference of the pressure stabilizing sub-circuit 22
Connect the pwm signal input terminal of the power output end P1 and the light modulation output sub-circuit 3.
In Fig. 1, the triode drive sub-circuits 21 include first resistor R1 and the first triode Q1；First electricity
The input terminal of one end namely the triode drive sub-circuits 21 for hindering R1 connects the brightness adjustment control end S, and the other end connects institute
State the base stage b of the first triode Q1；The emitter e of the first triode Q1 is grounded GND, collector c namely the triode
The output end of drive sub-circuits 21 connects the driving input terminal of the pressure stabilizing sub-circuit 22.
In Fig. 1, the pressure stabilizing sub-circuit 22 includes zener diode D and second resistance R2；The zener diode D's
Positive terminal connects the collector c of the first triode Q1, and negative pole end connects one end of the second resistance R2；Second electricity
The other end for hindering R2 connects the power output end P1；The common connection end of the zener diode D and the second resistance R2
Connect the pwm signal input terminal of the light modulation output sub-circuit 3.
In Fig. 1, the power supply control sub-circuit 1 includes 3rd resistor R3, the 4th resistance R4, the 5th resistance R5, second
Triode Q2 and third transistor Q3；One end of the 3rd resistor R3 connects the power supply enable end P, described in other end connection
The base stage b of second triode Q2；The emitter e of the second triode Q2 is grounded GND, collector c connection the 4th resistance
Connect the common connection end of one end of the 5th resistance R5 and the base stage b of the third transistor Q3 after R4, the described 3rd 3
The other end of pole pipe Q3 emitter e and the 5th resistance R5 access the power supply signal VCC, the collection of the third transistor Q3
The electrode c namely power output end P1.
In Fig. 1, the light modulation output sub-circuit 3 includes the 4th triode Q4；The base stage b of the 4th triode Q4 is
The pwm signal input terminal, the collector c connection power output end P1, emitter e export institute as light modulation output end OUT
Night pwm signal or pwm signal on daytime are stated, the night pwm signal or pwm signal on daytime act on the display brightness of LED not
Together, it is mainly realized by adjusting the duty ratio of pwm signal, in the present embodiment, the duty ratio of the night pwm signal can be with
It is 20%, the duty ratio of the pwm signal on daytime can be 80%.
In Fig. 1, the driving input terminal of the light modulation external LED illuminating circuit 4 of output end OUT, the LED illuminating circuit
The 4 status monitoring end CHECK connection MCU, the MCU is according to the former LED for controlling information and the status monitoring end CHECK
Status information issues the connection control signal and the dimming control signal from the power supply enable end P or issues described disconnected
Open control signal.The LED state information is specially one of off state, short-circuit condition and normal operating conditions.
A kind of second level light adjustment circuit provided in an embodiment of the present invention is driven by the triode of brightness adjustment control sub-circuit 2
Movement carries out the light modulation of LED with different night pwm signal or pwm signal on daytime is exported with the control action of MCU, and passes through
The pressure stabilization function of pressure stabilizing sub-circuit 22 prevents the light modulation output brownout in low pressure of sub-circuit 3, effectively improves MCU appearance
To the correct judgment of LED state, reliability, the stability of circuit are improved, so that the second level light adjustment to LED light is precisely arrived
Position；
The lamplight brightness of LED can make further adjustment according to the requirement of user of service in the embodiment of the present invention, pass through
The duty ratio for adjusting the night pwm signal or pwm signal on daytime may be implemented, and more humane, the scope of application is wider.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (9)
1. a kind of second level light adjustment circuit, which is characterized in that including MCU, the MCU is equipped with power supply enable end (P) and dims
Control terminal (S) further includes：
The power supply for accessing power supply signal (VCC) and the connection power supply enable end (P) controls sub-circuit (1), described for receiving
Be switched on or switched off control signal and the power supply signal (VCC) of MCU exports power supply signal from the power output end (P1) of itself
Or disabling signal；
And the brightness adjustment control sub-circuit (2) of the brightness adjustment control end (S) and the power output end (P1) is connected, it is used for root
Night is exported from the brightness adjustment control output end (S1) of itself according to the dimming control signal of the received power supply signal and the MCU
Dim signal or dim signal on daytime；It is exported alternatively, being separated according to the disabling signal；
And connect the brightness adjustment control output end (S1) of the power output end (P1) and the brightness adjustment control sub-circuit (2)
Light modulation output sub-circuit (3) exports night pwm signal for the night dim signal based on the received and dim signal on daytime
Or pwm signal on daytime；It is exported alternatively, being separated according to the disabling signal.
2. a kind of second level light adjustment circuit as described in claim 1, it is characterised in that：The brightness adjustment control sub-circuit (2)
Including triode drive sub-circuits (21) and pressure stabilizing sub-circuit (22), the input terminal of the triode drive sub-circuits (21) and defeated
Outlet is separately connected the driving input terminal of the brightness adjustment control end (S) and the pressure stabilizing sub-circuit (22), the pressure stabilizing sub-circuit
(22) energization input and output end of pressure-stabilizing is separately connected the power output end (P1) and light modulation output sub-circuit (3)
Pwm signal input terminal.
3. a kind of second level light adjustment circuit as claimed in claim 2, it is characterised in that：The triode drive sub-circuits
It (21) include first resistor (R1) and the first triode (Q1)；One end of the first resistor (R1) namely triode driving
The input terminal of sub-circuit (21) connects the brightness adjustment control end (S), and the other end connects the base stage of first triode (Q1)
(b)；The emitter (e) of first triode (Q1) is grounded (GND, collector (c) namely the triode drive sub-circuits
(21) output end connects the driving input terminal of the pressure stabilizing sub-circuit (22).
4. a kind of second level light adjustment circuit as claimed in claim 3, it is characterised in that：The pressure stabilizing sub-circuit (22) includes
Zener diode (D) and second resistance (R2)；The positive terminal of the zener diode (D) connects first triode (Q1)
Collector (c), negative pole end connect one end of the second resistance (R2)；The other end of the second resistance (R2) connects the electricity
Source output terminal (P1)；The zener diode (D) connects the light modulation output with the common connection end of the second resistance (R2)
The pwm signal input terminal of sub-circuit (3).
5. a kind of second level light adjustment circuit as claimed in claim 4, it is characterised in that：The power supply controls sub-circuit (1)
Including 3rd resistor (R3), the 4th resistance (R4), the 5th resistance (R5), the second triode (Q2) and third transistor (Q3)；Institute
The one end for stating 3rd resistor (R3) connects the power supply enable end (P), and the other end connects the base stage of second triode (Q2)
(b)；The emitter (e) of second triode (Q2) is grounded (GND), and collector (c) connects after connecting the 4th resistance (R4)
Connect the common connection end of one end of the 5th resistance (R5) and the base stage (b) of the third transistor (Q3), the described 3rd 3
Pole pipe (Q3) emitter (e) and the other end of the 5th resistance (R5) access the power supply signal (VCC), the three or three pole
Manage (collector (c) of Q3 namely the power output end (P1).
6. a kind of second level light adjustment circuit as described in claim 1, it is characterised in that：The light modulation exports sub-circuit (3)
Including the 4th triode (Q4)；The i.e. described pwm signal input terminal of the base stage (b) of 4th triode (Q4), collector (c) is even
The power output end (P1) is met, (e) emitter exports the night pwm signal or PWM on daytime as light modulation output end (OUT)
Signal.
7. a kind of second level light adjustment circuit as claimed in claim 6, it is characterised in that：The light modulation output end (OUT) is outside
The driving input terminal of LED illuminating circuit (4) is connect, the status monitoring end of the LED illuminating circuit (4) connects the MCU, described
MCU issues the connection from the power supply enable end (P) according to former control information and the LED state information at the status monitoring end
It controls signal and the dimming control signal or issues the disconnection and control signal.
8. a kind of second level light adjustment circuit as described in claim 1, it is characterised in that：The LED state information is open circuit
One of state, short-circuit condition and normal operating conditions.
9. a kind of second level light adjustment circuit as described in claim 1, it is characterised in that：The MCU is on-board air conditioner control
The MCU of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810729699.3A CN108924997B (en) | 2018-07-05 | 2018-07-05 | Two-stage light adjusting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810729699.3A CN108924997B (en) | 2018-07-05 | 2018-07-05 | Two-stage light adjusting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN108924997A true CN108924997A (en) | 2018-11-30 |
| CN108924997B CN108924997B (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810729699.3A Active CN108924997B (en) | 2018-07-05 | 2018-07-05 | Two-stage light adjusting circuit |
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| CN (1) | CN108924997B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110636664A (en) * | 2019-08-02 | 2019-12-31 | 惠州市德赛西威汽车电子股份有限公司 | Indicator lamp driving circuit with diagnosis function |
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| CN204795685U (en) * | 2015-05-21 | 2015-11-18 | 中广核核电运营有限公司 | Pilot lamp supply circuit and distribution system |
| CN105792416A (en) * | 2016-03-16 | 2016-07-20 | 浙江双宇电子科技有限公司 | Control circuit of switch light-dimming type LED lamp |
| CN207408568U (en) * | 2017-10-16 | 2018-05-25 | 惠州市德赛西威汽车电子股份有限公司 | A kind of car power supply voltage detection circuit of tape light |
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2018
- 2018-07-05 CN CN201810729699.3A patent/CN108924997B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202404876U (en) * | 2011-12-16 | 2012-08-29 | 惠州市德赛西威汽车电子有限公司 | Vehicular backlight driving circuit |
| CN202799276U (en) * | 2012-07-11 | 2013-03-13 | 惠州市德赛西威汽车电子有限公司 | Novel car-audio secondary light control circuit |
| CN204795685U (en) * | 2015-05-21 | 2015-11-18 | 中广核核电运营有限公司 | Pilot lamp supply circuit and distribution system |
| CN105792416A (en) * | 2016-03-16 | 2016-07-20 | 浙江双宇电子科技有限公司 | Control circuit of switch light-dimming type LED lamp |
| CN207408568U (en) * | 2017-10-16 | 2018-05-25 | 惠州市德赛西威汽车电子股份有限公司 | A kind of car power supply voltage detection circuit of tape light |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110636664A (en) * | 2019-08-02 | 2019-12-31 | 惠州市德赛西威汽车电子股份有限公司 | Indicator lamp driving circuit with diagnosis function |
| CN110636664B (en) * | 2019-08-02 | 2022-11-11 | 惠州市德赛西威汽车电子股份有限公司 | Indicator lamp driving circuit with diagnosis function |
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| CN108924997B (en) | 2020-03-24 |
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