CN109757007A - Power circuit - Google Patents
Power circuit Download PDFInfo
- Publication number
- CN109757007A CN109757007A CN201910136666.2A CN201910136666A CN109757007A CN 109757007 A CN109757007 A CN 109757007A CN 201910136666 A CN201910136666 A CN 201910136666A CN 109757007 A CN109757007 A CN 109757007A
- Authority
- CN
- China
- Prior art keywords
- frequency
- circuit
- power circuit
- output end
- resistor
- 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.)
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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
- H05B44/00—Circuit arrangements for operating electroluminescent light sources
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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]
- H05B45/30—Driver circuits
- H05B45/305—Frequency-control circuits
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- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Electronic Switches (AREA)
- Amplifiers (AREA)
Abstract
A kind of power circuit includes: driving chip, frequency setting circuit and frequency regulating circuit.Driving chip includes frequency input, the driving end for connecting load and the output end for feedback load variation.Frequency setting circuit rate of connections input terminal, for setting the working frequency of driving chip.Frequency regulating circuit rate of connections initialization circuit, frequency input and output end, for adjusting the working frequency of driving chip according to the signal of output end.
Description
Technical field
The present invention relates to power technique fields more particularly to a kind of power circuits.
Background technique
Existing power supply device usually has fixed working frequency.When power circuit starts or loads generation variation,
The work shape of power circuit can only be adjusted by changing the duty ratio of PWM (pulse width modulation) signal source
State, so that metal-oxide-semiconductor (the metal-oxide-semiconductor field-effect in power circuit
Transistor) in the state of hard switching.In the state of hard switching, the temperature of metal-oxide-semiconductor and loss increase, and lead to power supply
The working efficiency of circuit and less reliable.Meanwhile being switched fast for metal-oxide-semiconductor can bring serious electromagnetic interference
(electromagnetic interference), so that other electronic equipments can not work normally.
Therefore, it is necessary to a kind of power circuit be provided, to solve the above problems.
Summary of the invention
The purpose of the present invention is to provide a kind of power circuits, can be to avoid metal-oxide-semiconductor loss and electromagnetic interference.
To achieve the above object, the present invention provides a kind of power circuit characterized by comprising driving chip, including frequency
Rate input terminal, the driving end for connecting load and the output end for feeding back the load variation；Frequency setting circuit, connection
The frequency input, for setting the working frequency of the driving chip；And frequency regulating circuit, it connects the frequency and sets
Circuit, the frequency input and the output end are determined, for adjusting the driving chip according to the signal of the output end
Working frequency.
In some embodiments, when the signal enhancing of the output end, the frequency regulating circuit adjusts the driving
The working frequency of chip gradually decreases.
In some embodiments, when the signal of the output end weakens, the frequency regulating circuit adjusts the driving
The working frequency of chip gradually rises.
In some embodiments, the driving end connects the load by switching circuit, wherein the switching circuit packet
Include at least one transistor.
In some embodiments, the frequency setting circuit includes first resistor, wherein the first end of the first resistor
Connect the frequency input, the second end ground connection of the first resistor.
In some embodiments, the frequency regulating circuit includes second resistance and three polar bodys, wherein the second resistance
The base stage of the output end and three polar body is connected, the emitter-base bandgap grading of three polar body connects the first end of the first resistor, institute
State the collector ground connection of three polar bodys.
In some embodiments, the power circuit further includes 3rd resistor and at least one capacitor, wherein the third
The first end of resistance connects the output end, and the second end of the 3rd resistor connects the anode of at least one capacitor, institute
State the cathode ground connection of at least one capacitor.
In some embodiments, the frequency input is RT pin.
In some embodiments, the driving end is DRV pin.
In some embodiments, the output end is SSTCMP pin.
For feature and technology contents of the invention can be clearer and more comprehensible, please refer to below in connection with it is of the invention specifically
Bright and attached drawing, however attached drawing is only provided with reference to using, and is not intended to limit the present invention.
Detailed description of the invention
Fig. 1 is the functional block diagram of power circuit provided in an embodiment of the present invention；
Fig. 2 is the electrical block diagram according to embodiment illustrated in fig. 1.
Specific embodiment
In order to keep the purpose of the present invention, technological means and its effect more explicit, below with reference to attached drawing to this hair
It is bright further to illustrate.It should be appreciated that embodiment described herein is only a part of the embodiment of the present invention, rather than it is complete
The embodiment in portion, is not intended to limit the present invention.
Fig. 1 is the functional block diagram of power circuit provided in an embodiment of the present invention.Fig. 2 is the electricity according to embodiment illustrated in fig. 1
Line structure schematic diagram.It please also refer to Fig. 1 and Fig. 2, power circuit 1 includes: driving chip 10, frequency setting circuit 12 and frequency
Adjustment circuit 13.Driving chip 10 include frequency input 100, for connect load 11 driving end 101 and for feeding back it is negative
Carry the output end 102 of 11 variations.In some embodiments, load 11 includes at least one light emitting diode element.In this implementation
In example, frequency input 100 is timing resistor pin (timing resistor, RT), and driving end 101 is boosting driving pin
(voltage driving, DRV), output end 102 are Sofe Switch loop compensation (softswitching and loop
Compensation, SSTCMP) pin.When load 11 increases sharply, the voltage of output end 102 can also increase sharply；Conversely,
When load 11 reduces rapidly, the voltage of output end 102 can also be reduced rapidly.
12 rate of connections input terminal 100 of frequency setting circuit, is used to set the working frequency of driving chip 10.Such as Fig. 2
Shown, frequency setting circuit 12 includes first resistor R1, wherein the first end rate of connections input terminal 100 of first resistor R1, the
The second end of one resistance R1 is grounded.
13 rate of connections initialization circuit 12 of frequency regulating circuit, frequency input 100 and output end 102, are used for basis
The working frequency of the signal adjustment driving chip 10 of output end 102.As shown in Fig. 2, frequency regulating circuit 13 includes second resistance
R2 and three polar body T1, the wherein base stage of second resistance R2 connection output end 102 and three polar body T1, the emitter-base bandgap grading connection of three polar body T1 the
The first end of one resistance R1, and the collector ground connection of three polar body T1.In the present embodiment, the signal of output end 102 is voltage signal,
Three polar body T1 are three polar body of positive-negative-positive, and frequency regulating circuit 13 can be equivalent to be parallel to the variable resistance of first resistor R1.Cause
This, when the signal enhancing of output end 102, the working frequency of the adjustable driving chip 10 of frequency regulating circuit 13 gradually drops
It is low；Conversely, when the signal of output end 102 weakens, the working frequency of the adjustable driving chip 10 of frequency regulating circuit 13 by
Edge up height.That is, the voltage of output end 102 can also increase sharply when load 11 increases sharply, but driving chip 10
Working frequency can gradually decrease；Conversely, the voltage of output end 102 can also reduce rapidly when load 11 reduces rapidly, but drive
The working frequency of chip 10 can gradually rise.
As shown in Figure 1 and Figure 2, driving end 101 is by the connection of switching circuit 14 load 11, and wherein switching circuit 14 includes extremely
A few transistor Q1.In the present embodiment, transistor Q1 is metal-oxide-semiconductor.Furthermore power circuit 1 further includes filter circuit 15.Filter
Wave circuit 15 includes 3rd resistor R3 and at least one capacitor C1, and wherein the first end of 3rd resistor R3 connects output end 102, the
The anode of the second end connection capacitor C1 of three resistance R3, and the cathode ground connection of capacitor C1.In the present embodiment, when power circuit 1
When starting, capacitor C1 is electrically charged, so that the voltage of output end 102 is gradually increasing.Then, frequency regulating circuit 13 is according to output end
The working frequency of 102 voltage adjustment driving chip 10 gradually decreases.
In conclusion power circuit provided by the invention passes through frequency when power circuit starts or load generation variation
Adjustment circuit immediately and Serial regulation driving chip working frequency, thus avoid metal-oxide-semiconductor be lost and electromagnetic interference.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of power circuit characterized by comprising
Driving chip, the driving end including frequency input, for connecting load and the output for feeding back the load variation
End；
Frequency setting circuit connects the frequency input, for setting the working frequency of the driving chip；And
Frequency regulating circuit connects the frequency setting circuit, the frequency input and the output end, for according to
The signal of output end adjusts the working frequency of the driving chip.
2. power circuit as described in claim 1, which is characterized in that when the signal enhancing of the output end, the frequency
The working frequency that adjustment circuit adjusts the driving chip gradually decreases.
3. power circuit as described in claim 1, which is characterized in that when the signal of the output end weakens, the frequency
The working frequency that adjustment circuit adjusts the driving chip gradually rises.
4. power circuit as described in claim 1, which is characterized in that the driving end is connected described negative by switching circuit
It carries, wherein the switching circuit includes at least one transistor.
5. power circuit as described in claim 1, which is characterized in that the frequency setting circuit includes first resistor, wherein
The first end of the first resistor connects the frequency input, the second end ground connection of the first resistor.
6. power circuit as claimed in claim 5, which is characterized in that the frequency regulating circuit includes second resistance and three poles
Body, wherein the second resistance connects the base stage of the output end and three polar body, described in the emitter-base bandgap grading connection of three polar body
The first end of first resistor, the collector ground connection of three polar body.
7. power circuit as described in claim 1, which is characterized in that it further include 3rd resistor and at least one capacitor, wherein
The first end of the 3rd resistor connects the output end, and the second end of the 3rd resistor connects at least one capacitor
Anode, the cathode ground connection of at least one capacitor.
8. power circuit as described in claim 1, which is characterized in that the frequency input is RT pin.
9. power circuit as described in claim 1, which is characterized in that the driving end is DRV pin.
10. power circuit as described in claim 1, which is characterized in that the output end is SSTCMP pin.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910136666.2A CN109757007B (en) | 2019-02-25 | 2019-02-25 | Power supply circuit |
| PCT/CN2019/082619 WO2020172961A1 (en) | 2019-02-25 | 2019-04-15 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910136666.2A CN109757007B (en) | 2019-02-25 | 2019-02-25 | Power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109757007A true CN109757007A (en) | 2019-05-14 |
| CN109757007B CN109757007B (en) | 2020-08-11 |
Family
ID=66407654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910136666.2A Active CN109757007B (en) | 2019-02-25 | 2019-02-25 | Power supply circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109757007B (en) |
| WO (1) | WO2020172961A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201396582Y (en) * | 2009-03-20 | 2010-02-03 | 凹凸电子（武汉）有限公司 | Portable illumination device |
| CN103280190A (en) * | 2013-05-20 | 2013-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
| CN205232038U (en) * | 2015-12-16 | 2016-05-11 | 深圳Tcl数字技术有限公司 | Variable frequency power supply circuit and TV set |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201639826U (en) * | 2010-01-26 | 2010-11-17 | 上海创月能源科技有限公司 | LED lamp driving power circuit |
| CN101932158B (en) * | 2010-08-17 | 2013-01-23 | 深圳市洲明科技股份有限公司 | Led circuit |
-
2019
- 2019-02-25 CN CN201910136666.2A patent/CN109757007B/en active Active
- 2019-04-15 WO PCT/CN2019/082619 patent/WO2020172961A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201396582Y (en) * | 2009-03-20 | 2010-02-03 | 凹凸电子（武汉）有限公司 | Portable illumination device |
| CN103280190A (en) * | 2013-05-20 | 2013-09-04 | 深圳市华星光电技术有限公司 | Backlight driving circuit, liquid crystal display device and backlight driving method |
| CN205232038U (en) * | 2015-12-16 | 2016-05-11 | 深圳Tcl数字技术有限公司 | Variable frequency power supply circuit and TV set |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109757007B (en) | 2020-08-11 |
| WO2020172961A1 (en) | 2020-09-03 |
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