CN108124362B - A kind of Switching Power Supply and brightness regulating apparatus - Google Patents
A kind of Switching Power Supply and brightness regulating apparatus Download PDFInfo
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- CN108124362B CN108124362B CN201711346094.8A CN201711346094A CN108124362B CN 108124362 B CN108124362 B CN 108124362B CN 201711346094 A CN201711346094 A CN 201711346094A CN 108124362 B CN108124362 B CN 108124362B
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- reference voltage
- operational amplifier
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/105—Controlling the light source in response to determined parameters
- H05B47/11—Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light
-
- 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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The present invention provides a kind of Switching Power Supply and the brightness regulating apparatus including the Switching Power Supply, its first switch tube and second switch complementation conducting, make the received voltage of the non-inverting input terminal of operational amplifier, is the Complementary input structure result of the first reference voltage and the second reference voltage；When the duty ratio of pwm signal is too low, first reference voltage is input to the ratio very little of the non-inverting input terminal of operational amplifier, but the second reference voltage is input to the ratio then corresponding increase of the non-inverting input terminal of operational amplifier, supporting role is played to the received voltage of the non-inverting input terminal of operational amplifier, the received brownout of non-inverting input terminal of operational amplifier is avoided and influences the output of Switching Power Supply, leads to the problem of turning off the light.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of Switching Power Supply and brightness regulating apparatus.
Background technique
With the popularization of intelligent terminals, most intelligent terminals are provided with that automatically adjust screen with ambient brightness bright
The function of degree.For example, in many cases, the user of smart phone can see the mobile phone under night or dim environment；In such feelings
Under condition, smart phone can issue the extremely low pwm signal of duty ratio by PWM interface, carry out the output of control switch power supply, to adjust
Itself screen intensity, protection eyes.
But in above-mentioned adjustment process, when the duty ratio of pwm signal is too low (such as 1% or less), so that influencing switch
When the output of power supply, it will lead to screen blank screen, be unfavorable for the application of smart phone；Similarly, other application Switching Power Supply is set
Standby, under the control of extremely low duty ratio pwm signal, the brightness regulating apparatus such as backlight or illumination also will appear the problem of turning off the light.
Summary of the invention
The present invention provides a kind of Switching Power Supply and brightness regulating apparatus, to solve the duty ratio of pwm signal in the prior art
The problem of turning off the light when too low.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of Switching Power Supply, comprising: first switch tube, second switch, filter module and operational amplifier；Wherein:
The input terminal of the first switch tube receives the first reference voltage；
The input terminal or output end of the second switch receive the second reference voltage；Second reference voltage is greater than the
One preset value and less than the second preset value；
The output end of the first switch tube is connected with the output end of the second switch, and tie point passes through the filtering
Module is connected with the non-inverting input terminal of the operational amplifier；
The control terminal of the first switch tube receives pwm signal；
The control terminal of the second switch receives the pwm signal by NOT gate；
The inverting input terminal of the operational amplifier receives feedback signal；
The output end of the operational amplifier exports comparison signal.
Preferably, the output end of the second switch receives the second benchmark electricity by the second benchmark generative circuit
Pressure, the second benchmark generative circuit includes: constant-current source, resistance and third switching tube；Wherein:
The anode of the constant-current source is connected with power supply；
The cathode of the constant-current source is defeated by one end of the third switching tube and the resistance and the filter module
Enter end to be connected；
The control terminal of the third switching tube is connected with the control terminal of the second switch；
The other end of the resistance is connected with the output end of the output end of the first switch tube and the second switch.
Preferably, the filter module is single order RC filter circuit.
A kind of brightness regulating apparatus, comprising: the first benchmark generative circuit, the second benchmark generative circuit, control module and open
Powered-down source；Wherein:
The first benchmark generative circuit is for generating and exporting the first reference voltage；
The second benchmark generative circuit is for generating and exporting the second reference voltage；Second reference voltage is greater than the
One preset value and less than the second preset value；
The control module is for generating simultaneously output pwm signal；
The Switching Power Supply includes: first switch tube, second switch, filter module and operational amplifier；Wherein:
The input terminal of the first switch tube receives first reference voltage；
The input terminal or output end of the second switch receive second reference voltage；
The output end of the first switch tube is connected with the output end of the second switch, and tie point passes through the filtering
Module is connected with the non-inverting input terminal of the operational amplifier；
The control terminal of the first switch tube receives the pwm signal；
The control terminal of the second switch receives the pwm signal by NOT gate；
The inverting input terminal of the operational amplifier receives feedback signal；
The output end of the operational amplifier exports comparison signal.
Preferably, the second benchmark generative circuit includes: constant-current source, resistance and third switching tube；Wherein:
The anode of the constant-current source is connected with power supply；
The cathode of the constant-current source is defeated by one end of the third switching tube and the resistance and the filter module
Enter end to be connected；
The control terminal of the third switching tube is connected with the control terminal of the second switch；
The other end of the resistance is connected with the output end of the output end of the first switch tube and the second switch.
Preferably, the filter module is single order RC filter circuit.
Switching Power Supply provided by the invention, first switch tube and second switch complementation conducting, make operational amplifier
The received voltage of non-inverting input terminal is the Complementary input structure result of the first reference voltage and the second reference voltage；When accounting for for pwm signal
Sky than it is too low when, the first reference voltage is input to the ratio very little of the non-inverting input terminal of operational amplifier, but the second benchmark is electric
Pressure is input to the ratio then corresponding increase of the non-inverting input terminal of operational amplifier, received to the non-inverting input terminal of operational amplifier
Voltage plays supporting role, avoids the received brownout of non-inverting input terminal of operational amplifier and influences Switching Power Supply
It exports, lead to the problem of turning off the light.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the circuit diagram of Switching Power Supply provided in an embodiment of the present invention；
Fig. 2 be another embodiment of the present invention provides brightness regulating apparatus partial circuit schematic diagram.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The present invention provides a kind of Switching Power Supply, and the duty ratio to solve pwm signal in the prior art is turned off the light when too low
The problem of.
Specifically, the Switching Power Supply includes: first switch tube S1, second switch S2, filter module and fortune referring to Fig. 1
Calculate amplifier EA；Wherein:
The input terminal of first switch tube S1 receives the first reference voltage VREF1；
It is big that the input terminal or output end of second switch S2 receives the second reference voltage VREF2, the second reference voltage VREF2
In the first preset value and less than the second preset value；
The output end of first switch tube S1 is connected with the output end of second switch S2, and tie point passes through filter module and fortune
The non-inverting input terminal for calculating amplifier EA is connected；
The control terminal of first switch tube S1 receives pwm signal；
The control terminal of second switch S2 receives pwm signal by NOT gate；
The inverting input terminal of operational amplifier EA receives feedback signal FB；
The output end of operational amplifier EA exports comparison signal COMP, for realizing rear class brightness regulation.
Preferably, referring to Fig. 1, which is single order RC filter circuit, comprising: first resistor R1 and first capacitor
C1。
Assuming that the duty ratio of pwm signal is D, then it is (1- that the control terminal of second switch S2, which receives the duty ratio of signal,
D)；That is, first switch tube S1 is connected when pwm signal is 1, second switch S2 is connected when pwm signal is 0；Operation amplifier
The calculation formula of the received voltage VREFT of the non-inverting input terminal of device EA are as follows:
VREFT=[VREF1 × D × T+VREF2 × (1-D) × T] ÷ T=VREF1 × D+VREF2 × (1-D).
When the duty ratio D very little of pwm signal, VREF1 × D levels off to 0, and VREF2 × (1-D) levels off to
VREF2 is able to maintain that the received voltage VREFT of the non-inverting input terminal of operational amplifier EA will not be too low.
Setting for the second reference voltage VREF2, needs to be larger than the first preset value, it is ensured that in accounting for for pwm signal
When sky ratio D very little, it can make the received voltage VREFT of the non-inverting input terminal of operational amplifier EA will not be by the mistake of operational amplifier EA
It adjusts voltage to eat up, and then operational amplifier EA is made to maintain output；The specific value of second reference voltage VREF2 can be according to specific
Depending on application environment, within the scope of protection of this application.
The Switching Power Supply provided in this embodiment, first switch tube S1 and second switch S2 complementation conducting, make operation
The received voltage of the non-inverting input terminal of amplifier EA is the Complementary input structure result of the first reference voltage and the second reference voltage；When
When the duty ratio of pwm signal is too low, the first reference voltage is input to the ratio very little of the non-inverting input terminal of operational amplifier EA, but
It is the ratio then corresponding increase for the non-inverting input terminal that the second reference voltage is input to operational amplifier EA, to operational amplifier EA's
The received voltage of non-inverting input terminal plays supporting role, avoids the received voltage mistake of non-inverting input terminal of operational amplifier EA
Output that is low and influencing Switching Power Supply leads to the problem of turning off the light.
In addition, the setting for the second reference voltage VREF2, it is also necessary to make it less than the second preset value, and then become one
A minimum value, the received electricity of the non-inverting input terminal of operational amplifier EA can be made when the duty ratio D of pwm signal is very big
Pressure VREFT is similar to VREF1 × D, that is, does not influence the normal big space rate of chip and adjust work.Therefore, the present embodiment mentions
The Switching Power Supply supplied, the problem of turning off the light when both can solve small duty ratio, while nor affecting on normal big space rate and adjusting
Work.
On the basis of above-described embodiment, it is preferred that the output end of its second switch S2 is generated by the second benchmark
Circuit receives the second reference voltage VREF2, and referring to fig. 2, which includes: constant-current source, resistance R2 and third
Switching tube S3；Wherein:
The anode of constant-current source is connected with power supply；
The cathode of constant-current source is connected by third switching tube S3 with the input terminal of one end of resistance R2 and filter module；
The control terminal of third switching tube S3 is connected with the control terminal of second switch S2；
The other end of resistance R2 is connected with the output end of the output end of first switch tube S1 and second switch S2.
Assuming that the output electric current of constant-current source is I, the then received voltage of the non-inverting input terminal of operational amplifier EA in Fig. 2
The calculation formula of VREFT are as follows:
VREFT=[VREF1 × D × T+I × R2 × (1-D) × T] ÷ T=VREF1 × D+I × R2 × (1-D).
By above formula formula it is found that I × R2 i.e. the second reference voltage VREF2.
The present embodiment on the basis of above-described embodiment, gives the presentation mode of the second reference voltage VREF2 of one kind,
But it is not necessarily limited to this, can also be changed depending on its specific application environment, within the scope of protection of this application.
Another embodiment of the present invention additionally provides a kind of brightness regulating apparatus, comprising: the first benchmark generative circuit, the second base
Quasi- generative circuit, control module and Switching Power Supply；Wherein:
First benchmark generative circuit is for generating and exporting the first reference voltage VREF1；
Second benchmark generative circuit is for generating and exporting the second reference voltage VREF2；
Control module is for generating simultaneously output pwm signal；
The Switching Power Supply is as shown in Figure 1, comprising: first switch tube S1, second switch S2, filter module and operation amplifier
Device EA；Wherein:
The input terminal of first switch tube S1 receives the first reference voltage VREF1；
The input terminal or output end of second switch S2 receives the second reference voltage VREF2；
The output end of first switch tube S1 is connected with the output end of second switch S2, and tie point passes through filter module and fortune
The non-inverting input terminal for calculating amplifier EA is connected；
The control terminal of first switch tube S1 receives pwm signal；
The control terminal of second switch S2 receives pwm signal by NOT gate；
The inverting input terminal of operational amplifier EA receives feedback signal FB；
The output end of operational amplifier EA exports comparison signal COMP, for realizing rear class brightness regulation.
Preferably, referring to fig. 2, which includes: constant-current source, resistance and third switching tube S3；Wherein:
The anode of constant-current source is connected with power supply；
The cathode of constant-current source is connected by third switching tube S3 with the input terminal of one end of resistance and filter module；
The control terminal of third switching tube S3 is connected with the control terminal of second switch S2；
The other end of resistance is connected with the output end of the output end of first switch tube S1 and second switch S2.
Preferably, filter module is single order RC filter circuit.
Specific working principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (6)
1. a kind of Switching Power Supply characterized by comprising first switch tube, second switch, filter module and operation amplifier
Device；Wherein:
The input terminal of the first switch tube receives the first reference voltage；
The input terminal or output end of the second switch receive the second reference voltage；It is pre- that second reference voltage is greater than first
If being worth and less than the second preset value；
The output end of the first switch tube is connected with the output end of the second switch, and tie point passes through the filter module
It is connected with the non-inverting input terminal of the operational amplifier；
The control terminal of the first switch tube receives pwm signal；
The control terminal of the second switch receives the pwm signal by NOT gate；
The inverting input terminal of the operational amplifier receives feedback signal；
The output end of the operational amplifier exports comparison signal.
2. Switching Power Supply according to claim 1, which is characterized in that the output end of the second switch passes through the second base
Quasi- generative circuit receives second reference voltage, and the second benchmark generative circuit includes: constant-current source, resistance and third switch
Pipe；Wherein:
The anode of the constant-current source is connected with power supply；
The cathode of the constant-current source passes through the third switching tube and one end of the resistance and the input terminal of the filter module
It is connected；
The control terminal of the third switching tube is connected with the control terminal of the second switch；
The other end of the resistance is connected with the output end of the output end of the first switch tube and the second switch.
3. Switching Power Supply according to claim 1 or 2, which is characterized in that the filter module is single order RC filter circuit.
4. a kind of brightness regulating apparatus characterized by comprising the first benchmark generative circuit, the second benchmark generative circuit, control
Module and Switching Power Supply；Wherein:
The first benchmark generative circuit is for generating and exporting the first reference voltage；
The second benchmark generative circuit is for generating and exporting the second reference voltage；It is pre- that second reference voltage is greater than first
If being worth and less than the second preset value；
The control module is for generating simultaneously output pwm signal；
The Switching Power Supply includes: first switch tube, second switch, filter module and operational amplifier；Wherein:
The input terminal of the first switch tube receives first reference voltage；
The input terminal or output end of the second switch receive second reference voltage；
The output end of the first switch tube is connected with the output end of the second switch, and tie point passes through the filter module
It is connected with the non-inverting input terminal of the operational amplifier；
The control terminal of the first switch tube receives the pwm signal；
The control terminal of the second switch receives the pwm signal by NOT gate；
The inverting input terminal of the operational amplifier receives feedback signal；
The output end of the operational amplifier exports comparison signal, for realizing rear class brightness regulation.
5. brightness regulating apparatus according to claim 4, which is characterized in that the second benchmark generative circuit includes: perseverance
Stream source, resistance and third switching tube；Wherein:
The anode of the constant-current source is connected with power supply；
The cathode of the constant-current source passes through the third switching tube and one end of the resistance and the input terminal of the filter module
It is connected；
The control terminal of the third switching tube is connected with the control terminal of the second switch；
The other end of the resistance is connected with the output end of the output end of the first switch tube and the second switch.
6. brightness regulating apparatus according to claim 4 or 5, which is characterized in that the filter module is single order RC filtering
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711346094.8A CN108124362B (en) | 2017-12-15 | 2017-12-15 | A kind of Switching Power Supply and brightness regulating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711346094.8A CN108124362B (en) | 2017-12-15 | 2017-12-15 | A kind of Switching Power Supply and brightness regulating apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN108124362A CN108124362A (en) | 2018-06-05 |
| CN108124362B true CN108124362B (en) | 2019-11-01 |
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| CN201711346094.8A Active CN108124362B (en) | 2017-12-15 | 2017-12-15 | A kind of Switching Power Supply and brightness regulating apparatus |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393776A (en) * | 2011-09-30 | 2012-03-28 | 电子科技大学 | Serial connection type AC voltage stabilizer |
| CN105704857A (en) * | 2016-02-18 | 2016-06-22 | 无锡市芯茂微电子有限公司 | Led control chip and led constant current control circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090214243A1 (en) * | 2008-02-26 | 2009-08-27 | Kyocera Mita | Fixing Device and Image Forming Apparatus |
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2017
- 2017-12-15 CN CN201711346094.8A patent/CN108124362B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102393776A (en) * | 2011-09-30 | 2012-03-28 | 电子科技大学 | Serial connection type AC voltage stabilizer |
| CN105704857A (en) * | 2016-02-18 | 2016-06-22 | 无锡市芯茂微电子有限公司 | Led control chip and led constant current control circuit |
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| Publication number | Publication date |
|---|---|
| CN108124362A (en) | 2018-06-05 |
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Address after: 201199 Room 1201, Lane 908, Xiuwen Road, Minhang District, Shanghai Patentee after: SHANGHAI AWINIC ELECTRONIC TECHNOLOGY CO., LTD. Address before: Room 303-39, 33 Block 680 Guiping Road, Xuhui District, Shanghai, 2003 Patentee before: SHANGHAI AWINIC ELECTRONIC TECHNOLOGY CO., LTD. |
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