CN206879151U - A kind of VCO dims linear multi-stage constant current drive circuit - Google Patents
A kind of VCO dims linear multi-stage constant current drive circuit Download PDFInfo
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- CN206879151U CN206879151U CN201720787132.2U CN201720787132U CN206879151U CN 206879151 U CN206879151 U CN 206879151U CN 201720787132 U CN201720787132 U CN 201720787132U CN 206879151 U CN206879151 U CN 206879151U
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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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Abstract
The utility model discloses a kind of VCO and dims linear multi-stage constant current drive circuit, including：Rectification circuit, segment circuit, pwm circuit or simulation light modulator and dimmer switch linear circuit；The pin 1 of dimmer switch linear circuit is connected with constant current tube Q1 grid G, the pin 2 of dimmer switch linear circuit is grounded by resistance R6, the pin 3 of dimmer switch linear circuit is connected with pwm circuit or simulation light modulator, the pin 4 of dimmer switch linear circuit is grounded, and the pin 5 of dimmer switch linear circuit is connected with the output end of rectification circuit；Constant current tube Q1 drain D and the output end of segment circuit are connected, and constant current tube Q1 source S is connected with the pin 2 of dimmer switch linear circuit.The utility model is simple in construction, combines both linear segmented constant-current circuit and switch constant-current circuit advantage, accomplishes invariable power, tunable optical, overvoltage protection, overheat protector etc., while can also reduce Q1 power consumption.
Description
Technical field
It the utility model is related to electronic drive circuit control technology field, and in particular to a kind of linear point of VCO light modulation
Section constant-current drive circuit.
Background technology
LED is as a kind of efficient new light sources, because with long lifespan, energy consumption is low, energy-conserving and environment-protective, is just being widely used in each
Field illuminates.When LED drivings are in excess temperature, overvoltage, light modulation, linear power supply work has a disadvantage that：
1) linear constant current circuit power consumption increases, and makes adjustment pipe Q1 heatings severe；
2) normal linear circuit overheat protector, overvoltage protection, light modulation when all be change reference level amplitude reach protection and
Purpose is dimmed, the block switch device in segment circuit is closed the phenomenon that certain section of LED does not work due to amplitude reduction；
3) constant current adjustment pipe Q1 is fully operational in linear amplification region during common piecewise linearity light modulation, therefore it is very strict to generate heat
Evil, has a strong impact on the driver life-span.
Switching Power Supply is used for LED drivings advantage：Wide input voltage range, line efficiency height, outputting current steadily, ripple
It is small, the features such as switching tube is low in energy consumption, technology maturation；Shortcoming is cost height, and device is more, and assembling is complicated, easy failure.
Utility model content
In order to overcome existing LED linear drive part by part circuit light regulating technology Shortcomings, the utility model provides one kind
VCO dims linear multi-stage constant current drive circuit, makes both linear segmented constant-current circuit and switch constant-current circuit advantage knot
Close, accomplish invariable power, tunable optical, overvoltage protection, overheat protector etc., while Q1 power consumption can also be reduced.
In order to achieve the above object, the technical solution of the utility model is as follows：
A kind of VCO dims linear multi-stage constant current drive circuit, including：Rectification circuit and segment circuit, rectification circuit
Input electrically connected with city, the connection of the input of its output end and segment circuit, in addition to：Pwm circuit or simulation light modulator
And dimmer switch linear circuit；The pin 1 of dimmer switch linear circuit is connected with constant current tube Q1 grid G, dimmer switch line
Property circuit pin 2 be grounded by resistance R6, the pin 3 of dimmer switch linear circuit is connected with pwm circuit or simulation light modulator,
The pin 4 of dimmer switch linear circuit is grounded, and the pin 5 of dimmer switch linear circuit is connected with the output end of rectification circuit；It is permanent
Flow tube Q1 drain D and the output end of segment circuit connect, constant current tube Q1 source S and the pin 2 of dimmer switch linear circuit
Connection.
A kind of linear multi-stage constant current driving circuit structure of VCO light modulation of the utility model is simple, makes linear segmented constant current
Both circuit and switch constant-current circuit advantage combine, and accomplish invariable power, tunable optical, overvoltage protection, overheat protector etc., while can also
Reduce Q1 power consumption.
On the basis of above-mentioned technical proposal, following improvement can be also done：
As preferable scheme, the pin 6 of dimmer switch linear circuit is grounded by electric capacity C2.
Using above-mentioned preferable scheme, protection circuit.
As preferable scheme, segment circuit includes：Multiple LED being connected in parallel.
Using above-mentioned preferable scheme, segmentation is realized.
As preferable scheme, dimmer switch linear circuit includes：Frequency generating circuit and with frequency generating circuit connect
The constant-current circuit connect.
It is simple in construction using above-mentioned preferable scheme.
As preferable scheme, frequency generating circuit includes：Amplifier A, resistance R2, resistance R3, resistance R4, resistance R5,
Diode D1, diode D2 and electric capacity C1；Amplifier A negative input is by two branch roads of parallel connection with amplifier A's
Output end connects, resistance R4 and diode D1, another resistance R5 for series connection and two poles of two branch roads one for series connection
Pipe D2；Amplifier A negative input is grounded by electric capacity C1；Amplifier A electrode input end by resistance R3 with amplification
Device A output end connection；Amplifier A electrode input end is grounded by resistance R2.
Using above-mentioned preferable scheme, reference level can be effectively produced.
As preferable scheme, constant-current circuit includes：Amplifier B and resistance R7；
Amplifier B electrode input end is connected with amplifier A output end；
Amplifier B negative pole is grounded by resistance R6；
Amplifier B output end is connected by resistance R7 with constant current tube Q1 grid G.
Using above-mentioned preferable scheme, constant current is realized.
As preferable scheme, amplifier A electrode input ends are connected by resistance R1 and pwm circuit or simulation light modulator
Connect.
Using above-mentioned preferable scheme, pwm circuit or simulation light modulator realize the duty cycle adjustment of level.
As preferable scheme, frequency generating circuit produces the reference level between 0KHZ~100KHZ frequencies.
It is stable using above-mentioned preferable scheme, reference level.
As preferable scheme, the dutycycle of pwm circuit or simulation light modulator for adjusting reference level.
Using above-mentioned preferable scheme, it is convenient for dimming.
As preferable scheme, connected between rectification circuit and civil power by mu balanced circuit, mu balanced circuit is used to keep
Voltage is steady.
It is more stable using above-mentioned preferable scheme, performance.
Brief description of the drawings
Fig. 1 is the structural representation that the VCO that the utility model embodiment provides dims linear multi-stage constant current drive circuit
Figure.
Fig. 2 is the structural representation for the dimmer switch linear circuit that the utility model embodiment provides.
Fig. 3 is one of reference level Vref oscillogram that the utility model embodiment provides.
Fig. 4 is the two of the oscillogram for the reference level Vref that the utility model embodiment provides.
Fig. 5 is the three of the oscillogram for the reference level Vref that the utility model embodiment provides.
Fig. 6 is the normal linear constant current topology schematic diagram that the utility model embodiment provides.
Fig. 7 is the switched linear constant current topology schematic diagram that the utility model embodiment provides.
Wherein：1 rectification circuit, 2 segment circuits, 3PWM circuits, 4 dimmer switch linear circuits, 5 frequency generating circuits, 6 perseverances
Current circuit.
Embodiment
Describe preferred embodiment of the present utility model in detail below in conjunction with the accompanying drawings.
In order to reach the purpose of this utility model, a kind of VCO dims wherein the one of linear multi-stage constant current drive circuit
In a little embodiments,
As shown in figure 1, a kind of VCO dims linear multi-stage constant current drive circuit, including：Rectification circuit 1, Segmented electrical
Road 2, pwm circuit 3 and dimmer switch linear circuit 4.
The input of rectification circuit 1 is electrically connected with city, and its output end is connected with the input of segment circuit 2.
The pin 1 of dimmer switch linear circuit 4 is connected with constant current tube Q1 grid G；The pin of dimmer switch linear circuit 4
2 are grounded by resistance R6, and resistance R6 is detection resistance；The pin 3 of dimmer switch linear circuit 4 is connected with pwm circuit 3；Light modulation
The pin 4 of switched linear circuit 4 is grounded；The pin 5 of dimmer switch linear circuit 4 is connected with the output end of rectification circuit 1；Light modulation
The pin 6 of switched linear circuit 4 is grounded by electric capacity C2.
Segment circuit 2 includes：Multiple LED being connected in parallel.
Constant current tube Q1 drain D is connected with the output end of segment circuit 2, and constant current tube Q1 source S and dimmer switch is linear
The pin 2 of circuit 4 connects.
A kind of linear multi-stage constant current driving circuit structure of VCO light modulation of the utility model is simple, and dimmer switch is linearly electric
The reference level on road 4 can also can be produced by pwm circuit 3 by dimmer switch linear circuit 4 itself, and reference level frequency is
Between 0KHZ~100KHZ, 0-100% dutycycle level is produced during light modulation, is output to the reference pin of dimmer switch linear circuit 4,
Duty ratio control the constant current tube Q1, constant current tube Q1 that different proportion is produced when pwm circuit 3 dims are operated in HF switch constant current shape
State, it is therefore constant by the current peak of segment circuit 2 due to being dimmed using high frequency duty cycle, segment circuit 2 can be kept during light modulation
Every section of all average luminescence, and constant current tube Q1 temperature rise can be reduced.
A kind of VCO of the utility model dims linear multi-stage constant current drive circuit, makes linear segmented constant-current circuit and opens
Close both constant-current circuit advantages to combine, accomplish invariable power, tunable optical, overvoltage protection, overheat protector etc. while Q1 work(can be reduced
Consumption.
As shown in Fig. 2 in order to further optimize implementation result of the present utility model, in other embodiment,
Remaining feature technology is identical, and difference is, dimmer switch linear circuit 4 includes：Frequency generating circuit 5 and with frequency send out
The constant-current circuit 6 that raw circuit 5 connects.
Frequency generating circuit 5 includes：Amplifier A, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, diode
D2 and electric capacity C1；Amplifier A negative input is connected by two branch roads of parallel connection with amplifier A output end, and this two
The individual one resistance R4 and diode D1, another resistance R5 and diode D2 for series connection for series connection of branch road；Amplifier A's is negative
Pole input is grounded by electric capacity C1；Amplifier A electrode input end is connected by resistance R3 with amplifier A output end；
Amplifier A electrode input end is grounded by resistance R2.
Constant-current circuit 6 includes：Amplifier B and resistance R7；Amplifier B electrode input end and amplifier A output end
Connection；Amplifier B negative pole is grounded by resistance R6；Amplifier B output end is connected by resistance R7 and constant current tube Q1 grid G
Connect.
Amplifier A electrode input ends are connected by resistance R1 with pwm circuit or simulation light modulator.
Frequency generating circuit 5 produces the reference level between 0KHZ~100KHZ frequencies.Pwm circuit 3 is used to adjust benchmark
The dutycycle of level.
Frequency generating circuit 5 produces fixed frequency, the dutycycle level as corresponding to outside pwm circuit 3 adjusts generation, output
Reference level of the dutycycle level as the comparison amplifier B of constant-current circuit 6.
Segment circuit 2 connects constant current tube Q1 drain electrode, constant current tube Q1 source electrode connecting detections resistance R6, resistance R6 detect voltage by
The comparison amplifier B negative terminals of constant-current circuit 6 compare with reference level.
Frequency generating circuit 5 can be exported by the outside modulation duty cycle of pwm circuit 3 of resistance R1 connections, frequency generating circuit 5
The reference level Vref signal of 0-100% dutycycles, as seen in figures 3-5.
The signal modulation frequency generating circuit 5 of pwm circuit 3, constant-current circuit 6, constant-current circuit 6 are controlled by frequency generating circuit 5
Connect constant current tube Q1.
As Fig. 6 and Fig. 7 are respectively shown in normal linear and switched linear maximum different principle topology.
A kind of the utility model linear multi-stage constant current drive circuit of voltage-controlled light modulation has the beneficial effect that：
With linear segmented constant current and constant power, overvoltage protection can be used as, PWM light modulations can be used as and simulates light modulation, entirely
Constant current unit is to be operated in the warbled on off states of 0-100KHZ, really realizes linear switch LED actuation techniques, this practicality
The advantages of new linear power supply, there is the characteristic of Switching Power Supply again, therefore the utility model has been broken linear power supply and can only applied
Drive, can be applied in single channel peak power 50W drivings in low-power LED.
Because utility model works are in linear on off state, output LED current peak value is to maintain constant, LED electricity
Stream size be by duty cycle adjustment, therefore linear multistage application in make power limitation control, brightness adjustment control, overvoltage control when not
The LED sections of phenomenon not worked can be made.
In order to further optimize implementation result of the present utility model, in other embodiment, remaining feature skill
Art is identical, and difference is, pwm circuit 3 can also be simulation light modulator.Frequency generating circuit 5 can be connected by resistance R1
External analog light modulator modulation duty cycle；Can also be by the outside modulation duty cycle of pwm circuit 3 of resistance R1 connections, both dim
Function automatically switches, and frequency generating circuit 5 exports the base-level signal of Vref 0-100% dutycycles.
In order to further optimize implementation result of the present utility model, in other embodiment, remaining feature skill
Art is identical, and difference is, is connected between rectification circuit and civil power by mu balanced circuit, and mu balanced circuit is used to keep voltage
Steadily.
It is more stable using above-mentioned preferable scheme, performance.
The above is only preferred embodiment of the present utility model, it is noted that for one of ordinary skill in the art
For, on the premise of not departing from the utility model and creating design, various modifications and improvements can be made, these belong to this
The protection domain of utility model.
Claims (10)
1. a kind of VCO dims linear multi-stage constant current drive circuit, including：Rectification circuit and segment circuit,
The input of the rectification circuit is electrically connected with city, and its output end is connected with the input of the segment circuit, its feature
It is, in addition to：Pwm circuit or simulation light modulator and dimmer switch linear circuit；
The pin 1 of the dimmer switch linear circuit is connected with constant current tube Q1 grid G, and the dimmer switch linear circuit draws
Pin 2 is grounded by resistance R6, and the pin 3 of the dimmer switch linear circuit is connected with the pwm circuit or simulation light modulator, institute
The pin 4 for stating dimmer switch linear circuit is grounded, the pin 5 of the dimmer switch linear circuit and the output of the rectification circuit
End connection；
The drain D of the constant current tube Q1 is connected with the output end of the segment circuit, source S and the tune of the constant current tube Q1
The pin 2 of photoswitch linear circuit connects.
2. VCO according to claim 1 dims linear multi-stage constant current drive circuit, it is characterised in that the light modulation
The pin 6 of switched linear circuit is grounded by electric capacity C2.
3. VCO according to claim 2 dims linear multi-stage constant current drive circuit, it is characterised in that the segmentation
Circuit includes：Multiple LED being connected in parallel.
4. the VCO according to claim any one of 1-3 dims linear multi-stage constant current drive circuit, it is characterised in that
The dimmer switch linear circuit includes：Frequency generating circuit and the constant-current circuit being connected with the frequency generating circuit.
5. VCO according to claim 4 dims linear multi-stage constant current drive circuit, it is characterised in that the frequency
Generation circuit includes：Amplifier A, resistance R2, resistance R3, resistance R4, resistance R5, diode D1, diode D2 and electric capacity C1；
Amplifier A negative input is connected by two branch roads of parallel connection with the output end of the amplifier A, two branch roads
The one resistance R4 and diode D1, another resistance R5 and diode D2 for series connection for series connection；
Amplifier A negative input is grounded by electric capacity C1；
Amplifier A electrode input end is connected by resistance R3 with the output end of the amplifier A；
Amplifier A electrode input end is grounded by resistance R2.
6. VCO according to claim 5 dims linear multi-stage constant current drive circuit, it is characterised in that the constant current
Circuit includes：Amplifier B and resistance R7；
Amplifier B electrode input end is connected with amplifier A output end；
Amplifier B negative pole is grounded by resistance R6；
Amplifier B output end is connected by resistance R7 with constant current tube Q1 grid G.
7. VCO according to claim 6 dims linear multi-stage constant current drive circuit, it is characterised in that the amplification
Device A electrode input ends are connected by resistance R1 with the pwm circuit or simulation light modulator.
8. VCO according to claim 7 dims linear multi-stage constant current drive circuit, it is characterised in that the frequency
The reference level between circuit generation 0KHZ~100KHZ frequencies occurs.
9. VCO according to claim 8 dims linear multi-stage constant current drive circuit, it is characterised in that the PWM
Circuit or simulation light modulator are used for the dutycycle for adjusting reference level.
10. VCO according to claim 9 dims linear multi-stage constant current drive circuit, it is characterised in that described
Connected between rectification circuit and the civil power by mu balanced circuit, the mu balanced circuit is used to keep voltage steady.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720787132.2U CN206879151U (en) | 2017-06-30 | 2017-06-30 | A kind of VCO dims linear multi-stage constant current drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720787132.2U CN206879151U (en) | 2017-06-30 | 2017-06-30 | A kind of VCO dims linear multi-stage constant current drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206879151U true CN206879151U (en) | 2018-01-12 |
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|---|---|---|---|
| CN201720787132.2U Expired - Fee Related CN206879151U (en) | 2017-06-30 | 2017-06-30 | A kind of VCO dims linear multi-stage constant current drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107182149A (en) * | 2017-06-30 | 2017-09-19 | 苏州菲达旭微电子有限公司 | A kind of VCO dims linear multi-stage constant current drive circuit |
-
2017
- 2017-06-30 CN CN201720787132.2U patent/CN206879151U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107182149A (en) * | 2017-06-30 | 2017-09-19 | 苏州菲达旭微电子有限公司 | A kind of VCO dims linear multi-stage constant current drive circuit |
| CN107182149B (en) * | 2017-06-30 | 2019-10-25 | 苏州菲达旭微电子有限公司 | A kind of linear multi-stage constant current driving circuit of voltage controlled oscillation light modulation |
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Granted publication date: 20180112 |