CN208175052U - A kind of control circuit and lighting circuit of lighting circuit - Google Patents
A kind of control circuit and lighting circuit of lighting circuit Download PDFInfo
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- CN208175052U CN208175052U CN201820679058.7U CN201820679058U CN208175052U CN 208175052 U CN208175052 U CN 208175052U CN 201820679058 U CN201820679058 U CN 201820679058U CN 208175052 U CN208175052 U CN 208175052U
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Abstract
The utility model discloses a kind of control circuits of lighting circuit, rectified voltage is obtained after exchange input is rectified, wherein the cold end of rectified voltage is used as with reference to ground, the load of the lighting circuit is composed in series by N number of lamp string, N is the natural number more than or equal to 2, when the control circuit detects exchange input access light modulator, control N number of lamp string is simultaneously turned on；When the control circuit detects that exchange input controls N number of lamp string and be respectively turned on without access light modulator according to the rectified voltage.High Power Factor, and compatible light modulator may be implemented in the utility model, and scheme is simple, is easy to implement.
Description
Technical field
The utility model relates to power electronics fields, and in particular to a kind of control circuit and power for illumination of lighting circuit
Road.
Background technique
LED light due to its environmental protection more more energy efficient than traditional fluorescent lamp and incandescent lamp, so LED light slowly replacing it is existing
Fluorescent lamp and incandescent lamp.In the incandescent lamp with light modulator, similarly wish to use LED light to replace, thus LED need to be simultaneous
Hold light modulator.Linear LED drive circuit realizes advantage simple, at low cost with it, is used widely.But linear LED drives
Circuit is moved due to constant current conduction mode inherent characteristics, the main product power factor of linearity light adjusting system currently on the market is low,
A large amount of harmonic pollution is generated to power grid, reduces power grid quality, interference is generated to other electrical equipments.Therefore, how linear
The problem of being compatible with light modulator in LED drive circuit, and realizing High Power Factor, be current urgent need to resolve.
Utility model content
In view of this, being used the purpose of this utility model is to provide a kind of control circuit of lighting circuit and lighting circuit
To solve the problems, such as that linear drive circuit power factor is low in the prior art and incompatible light modulator.
The technical solution of the utility model is to provide a kind of control circuit of lighting circuit, and exchange input is rectified
After obtain rectified voltage, wherein the cold end of rectified voltage be used as with reference to ground, the load of the lighting circuit is by N number of lamp string string
Connection composition, N are the natural number more than or equal to 2, exchange input access light modulator when the control circuit detects, control the N
A lamp string simultaneously turns on；When the control circuit detects exchange input without access light modulator, according to the rectified voltage, control
N number of lamp string is made to be respectively turned on.
As optional, including voltage detecting circuit and current control circuit, two input terminals of the voltage detecting circuit
It is connected respectively to the hot end and cold end of the rectified voltage, the current control circuit receives the voltage detecting electricity
The output voltage on road；The high voltage end of the rectified voltage is connected to the first end of the first lamp string, institute by one-way conduction element
The second end for stating the first lamp string is connected to by first switch module with reference to ground, and the second end of 2~N lamp string passes through the 2nd respectively
~N one-way conduction element is connected to 2~N switch module, and the output voltage of the current control circuit is connected to the described 1st~
The control terminal of N switch module；
The voltage detecting circuit judges whether the ac input end accesses light modulation by detecting the rectified voltage
Device, when detecting access light modulator, the current control circuit controls the N switch module and is connected, and control the described 1st~
(N-1) switch module turns off；When detecting that the current control circuit is according to the voltage detecting electricity when not accessing light modulator
The output on road controls one of switch module conducting in 1~N switch module, controls remaining shutdown.
As optional, when the voltage detecting circuit, which detects, does not access light modulator, when the rectified voltage is in
When in kth voltage range, current control circuit control kth switch module conducting, remaining shutdown, wherein k be 1~N from
So number.
As optional, 1~N switch module is 1~N MOS, and the grid of 1~N MOS is the described 1st
The control terminal of~N switch module.
As optional, the lighting circuit includes N number of sampling resistor, and the first end of the N MOS is adopted by the N
Sample resistance is connected to the reference ground, and the first end of the described 1st~(N-1) MOS passes through the described 1st~(N-1) sampling electricity respectively
Resistance is connected to the first end of the N MOS, and the current control circuit receives the first end voltage of 1~N MOS.
As optional, when detecting access light modulator, first end electricity of the current control circuit to the N MOS
Pressure carries out operation amplifier, and the grid voltage for controlling the N MOS makes the first end voltage of N MOS close to N with reference to electricity
Pressure；When detecting that the current control circuit is according to the output of the voltage detecting circuit, to described when not accessing light modulator
The first end voltage of 1~N MOS carries out operation amplifier, and the grid voltage for controlling 1~N MOS respectively makes 1~N
The first end voltage of MOS is close to 1~N reference voltage.
The another technical solution of the utility model is to provide a kind of control method of lighting circuit, exchange input warp
Rectified voltage is obtained after rectification, wherein the cold end of rectified voltage is used as with reference to ground, and the load of the lighting circuit is by N number of lamp
String is composed in series, and N is the natural number more than or equal to 2, and when detecting exchange input access light modulator, it is same to control N number of lamp string
When be connected；When detecting exchange input without access light modulator, according to the rectified voltage, control N number of lamp string is led respectively
It is logical.
As optional, the high voltage end of the rectified voltage is connected to the first of the first lamp string by one-way conduction element
The second end at end, first lamp string is connected to by first switch module with reference to ground, and the second end of 2~N lamp string is led to respectively
It crosses 2~N one-way conduction element and is connected to 2~N switch module；
The rectified voltage is detected, and judges whether the ac input end accesses light modulator, accesses light modulation when detecting
When device, the N switch module conducting is controlled, controls the 1st~(N-1) the switch module shutdown；It is not accessed when detecting
When light modulator, one of switch module conducting in 1~N switch module is controlled, remaining shutdown is controlled.
As optional, when detect do not access light modulator when, when the rectified voltage is in kth voltage range,
The conducting of kth switch module is controlled, remaining shutdown, wherein k is the natural number of 1~N.
As optional, 1~N switch module is 1~N MOS, and the grid of 1~N MOS is the described 1st
The control terminal of~N switch module.
As optional, the lighting circuit includes N number of sampling resistor, and the first end of the N MOS is adopted by the N
Sample resistance is connected to the reference ground, and the first end of the described 1st~(N-1) MOS passes through the described 1st~(N-1) sampling electricity respectively
Resistance is connected to the first end of the N MOS, and the current control circuit receives the first end voltage of 1~N MOS.
As optional, when detecting access light modulator, operation amplifier is carried out to the first end voltage of the N MOS,
The grid voltage for controlling the N MOS makes the first end voltage of N MOS close to N reference voltage；Do not have when detecting
When accessing light modulator, operation amplifier is carried out to the first end voltage of 1~N MOS, controls 1~N MOS respectively
Grid voltage make the first end voltage of 1~N MOS close to 1~N reference voltage.
Another technical solution of the utility model is to provide a kind of lighting circuit.
It is had the following advantages that compared with prior art using the circuit structure and method of the utility model：Height may be implemented
Power factor, and compatible light modulator, scheme is simple, is easy to implement.
Detailed description of the invention
Fig. 1 is the realization block diagram of the utility model lighting circuit and its control circuit；
Fig. 2 (a) is the capacitance connection mode of an embodiment of the present invention；
Fig. 2 (b) is the capacitance connection mode of another embodiment of the utility model；
Fig. 3 is the lighting circuit and its control circuit of an embodiment of the present invention；
Fig. 4 is the circuit diagram of the sampling resistor of an embodiment of the present invention；
Fig. 5 is the circuit diagram of the sampling resistor of another embodiment of the utility model；
Fig. 6 is a kind of embodiment of the utility model current control circuit 420；
Fig. 7 is a kind of embodiment of the utility model lamp string；
Fig. 8 is rectified voltage VREC when the utility model input terminal does not access light modulator, the first lamp string to N lamp string
Voltage VF and input current iin waveform；
Fig. 9 is that the utility model input terminal accesses light modulator, and the rectified voltage VREC, the first lamp string when being big light modulation angle are arrived
The voltage VF and input current iin waveform of N lamp string；
Figure 10 is that the utility model input terminal accesses light modulator, rectified voltage VREC, the first lamp string when being ditty optic angle
To the voltage VF and input current iin waveform of N lamp string；
Specific embodiment
It is described in detail below in conjunction with preferred embodiment of the attached drawing to the utility model, but the utility model is not merely
It is limited to these embodiments.The utility model covers any substitution made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and that this can also be understood completely is practical new for description without these details for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing
It is all made of more simplified form and uses non-accurate ratio, only to facilitate, lucidly aid in illustrating the utility model
The purpose of embodiment.
The utility model provides a kind of control circuit of lighting circuit, obtains rectified voltage after exchange input is rectified
VREC, wherein the cold end of rectified voltage is used as with reference to ground, and the load of the lighting circuit is composed in series by N number of lamp string, and N is
Natural number more than or equal to 2, when the control circuit detects exchange input access light modulator, control N number of lamp string is simultaneously
Conducting；When the control circuit detects that exchange input controls described N number of without access light modulator according to the rectified voltage
Lamp string is respectively turned on.That is, rectified voltage VREC in different voltage ranges, then different lamp strings is connected.As one
Kind embodiment, rectified voltage is high, and the lamp string quantity of conducting is more；Rectified current is forced down, and the lamp string quantity of conducting is few.
High Power Factor, and compatible light modulator may be implemented in the utility model, and scheme is simple, is easy to implement.
It please refers to shown in Fig. 1, the control circuit 400 of lighting circuit includes voltage detecting circuit 410 and current control circuit
420, two input terminals of the voltage detecting circuit 400 are connected respectively to the hot end and low electricity of the rectified voltage VREC
Position end, the current control circuit 420 receive the output voltage of the voltage detecting circuit 410；The rectified voltage VREC's
High voltage end is connected to the first end of the first lamp string LED1 by one-way conduction element D01, and the second of the first lamp string LED1
End is connected to by first switch module SW1 with reference to ground, and the second end of 2~N lamp string LED2~LEDN passes through 2~N respectively
One-way conduction element D02~D0N is connected to 2~N switch module SW2~SWN, the output electricity of the current control circuit 420
Pressure is connected to the control terminal of 1~N switch module SW1~SWN；The second end of m lamp string LEDk is connected to m+1 lamp string
The first end of LED (m+1), wherein m is the natural number of 1~(N-1)；The voltage detecting circuit 410 is by detecting the rectification
Voltage VREC, and judge whether the ac input end accesses light modulator, when detecting access light modulator, the current control
Electric 410 tunnels control the N switch module SWN conducting, control the 1st~(N-1) switch module SW1~SW (N-1) shutdown；
When detecting that the current control circuit is according to the output of the voltage detecting circuit, described in control when not accessing light modulator
One of switch module conducting in 1~N switch module SW1~SWN, controls remaining shutdown.
As an implementation, when the voltage detecting circuit 410, which detects, does not access light modulator, when described whole
When galvanic electricity pressure VREC is in kth voltage range, the current control circuit 420 controls kth switch module SWk conducting, remaining
Shutdown, wherein k is the natural number of 1~N.
Please refer to shown in Fig. 2 (a), the both ends of capacitor C00 be connected to the first lamp string first end and N lamp string the
Two ends.Capacitor C00 is added, reduces load ripple.
It please refers to shown in Fig. 2 (b), is the capacitance connection mode of another embodiment, capacitor C01~C0N is respectively with first
LED1~N lamp string LEDN is in parallel.
As an implementation, 1~N switch module is 1~N MOS, the grid of 1~N MOS
For the control terminal of 1~N switch module.Metal-oxide-semiconductor can be NMOS and be also possible to PMOS.It is illustrated by taking NMOS as an example.
The first end and second end of the MOS is respectively the source electrode and drain electrode of NMOS.
It please refers to shown in Fig. 3,1~N switch module SW1~SWN is 1~N NMOS, 1~N NMOS
Grid be 1~N switch module SW1~SWN control terminal.
With continued reference to shown in Fig. 3, lighting circuit includes N number of sampling resistor, and the source electrode of the N NMOS passes through the N
Sampling resistor R0N is connected to the reference ground, and the source electrode of the described 1st~(N-1) NMOS passes through first sampling resistor respectively
R01~the (N-1) sampling resistor R0 (N-1) is connected to the source electrode of the N NMOS, and the current control circuit 420 receives institute
State the source voltage of 1~N NMOS.
Refering to what is shown in Fig. 4, being another connection type of sampling resistor, the source electrode of N NMOS is sampled by the N
Resistance R0N is connected to described with reference to ground, and the source electrode of the m NMOS is connected to described the by the m sampling resistor R0k
(m+1) source electrode of NMOS, the current control circuit 420 receive source voltage S01~S0N of 1~N NMOS, wherein
M is the natural number of 1~(N-1).
It please refers to shown in Fig. 5, is another connection type of sampling resistor, the source electrode of 1~N NMOS passes through the described 1st
~N sampling resistor R01~R0N is connected to the reference ground, and the current control circuit 420 receives 1~N NMOS's
Source voltage S01~S0N.
When detecting access light modulator, the current control circuit 420 to the source voltage S0N of the N NMOS into
Row operation amplifier, the grid voltage G0N for controlling the N NMOS refer to the source voltage S0N of N NMOS close to N
Voltage；When detect do not access light modulator when, the current control circuit 420 according to the size of the rectified voltage VREC,
Operation amplifier is carried out to source voltage S01~S0N of 1~N NMOS, controls the grid voltage of 1~N NMOS
G01~G0N makes source voltage S01~S0N of 1~N NMOS close to 1~N reference voltage.
It please refers to shown in Fig. 6, is a kind of embodiment of current control circuit 420.The source voltage of 1~N NMOS
S01~S0N is connected respectively to the negative input end of 421~42N of operational amplification circuit, 1~N reference voltage REF1~REFN difference
It is connected to the positive input terminal of operational amplification circuit A, voltage detecting circuit 410 exports enable signal EN1~ENN, is connected respectively to
It is connected to the enable end of 421~42N of operational amplification circuit, the output end of 421~42N of operational amplification circuit is connected to 1~N
Grid voltage G01~G0N of NMOS.The output end of operational amplifier 42N is connected to by capacitor C421 with reference to ground.
It please refers to shown in Fig. 7, the m lamp string is the LED of multiple sequential series.The quantity of different LED light strings can not
It is equal.
In order to be compatible with light modulator, lighting circuit further includes leadage circuit 300, and the both ends of leadage circuit 300 are connected respectively to
The output of the hot end and cold end of rectified voltage, voltage detecting circuit 410 controls leadage circuit.
Please refer to shown in Fig. 8, Fig. 9 and Figure 10, respectively N=2, input terminal do not access light modulator, light modulator wide-angle,
The voltage VF and input current iin waveform of rectified voltage VREC, the first lamp string to N lamp string when light modulator low-angle.When
Voltage detecting circuit 410 detects that input side does not access light modulator, then controls leadage circuit 300 and do not generate leakage current.When
Voltage detecting circuit 410 detects that input side accesses light modulator, then controls leadage circuit 300 and generate leakage current, to maintain to adjust
The conducting of light device.
The utility model provides a kind of lighting circuit, including above-mentioned control circuit 400.
The utility model also provides a kind of control method of lighting circuit, obtains rectified voltage after exchange input is rectified,
Wherein the cold end of rectified voltage is used as with reference to ground, and the load of the lighting circuit is composed in series by N number of lamp string, N be greater than
Natural number equal to 2 controls N number of lamp string and simultaneously turns on when detecting exchange input access light modulator；It is exchanged when detecting
Input controls N number of lamp string and is respectively turned on without access light modulator according to the rectified voltage.
The high voltage end of the rectified voltage is connected to the first end of the first lamp string by one-way conduction element, and described first
The second end of lamp string is connected to by first switch module with reference to ground, and it is unidirectional that the second end of 2~N lamp string passes through 2~N respectively
Breakover element is connected to 2~N switch module；
The rectified voltage is detected, and judges whether the ac input end accesses light modulator, accesses light modulation when detecting
When device, the N switch module conducting is controlled, controls the 1st~(N-1) the switch module shutdown；It is not accessed when detecting
When light modulator, one of switch module conducting in 1~N switch module is controlled, remaining shutdown is controlled.
When detect do not access light modulator when, when the rectified voltage is in kth voltage range, control kth open
Module conducting is closed, remaining shutdown, wherein k is the natural number of 1~N.
1~N switch module is 1~N MOS, and the grid of 1~N MOS is 1~N switching molding
The control terminal of block.
The lighting circuit includes N number of sampling resistor, and the first end of the N MOS connects by the N sampling resistor
It is connected to the reference ground, the first end of the described 1st~(N-1) MOS is passed through the described 1st~(N-1) sampling resistor respectively and is connected to
The first end of the N MOS, the current control circuit receive the first end voltage of 1~N MOS.
When detecting access light modulator, operation amplifier is carried out to the first end voltage of the N MOS, controls described the
The grid voltage of N MOS makes the first end voltage of N MOS close to N reference voltage；Light modulator is not accessed when detecting
When, operation amplifier is carried out to the first end voltage of 1~N MOS, controls the grid voltage of 1~N MOS respectively
So that the first end voltage of 1~N MOS is close to 1~N reference voltage.
In addition to this, although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in this field
Those of ordinary skill apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and record is not known
Content, then can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (7)
1. a kind of control circuit of lighting circuit, it is characterised in that：Rectified voltage is obtained after exchange input is rectified, wherein rectifying
The cold end of voltage is used as with reference to ground, and the load of the lighting circuit is composed in series by N number of lamp string, N be more than or equal to 2 from
So number accesses light modulator when the control circuit detects that exchange inputs, controls N number of lamp string and simultaneously turn on；When the control
Circuit processed detects that exchange input controls N number of lamp string and be respectively turned on without access light modulator according to the rectified voltage.
2. the control circuit of lighting circuit according to claim 1, it is characterised in that：Including voltage detecting circuit and electric current
Control circuit, two input terminals of the voltage detecting circuit are connected respectively to the hot end and low potential of the rectified voltage
End, the current control circuit receive the output voltage of the voltage detecting circuit；The high voltage end of the rectified voltage passes through
One-way conduction element is connected to the first end of the first lamp string, and the second end of first lamp string is connected to by first switch module
With reference to ground, the second end of 2~N lamp string passes through 2~N one-way conduction element respectively and is connected to 2~N switch module, described
The output voltage of current control circuit is connected to the control terminal of 1~N switch module；
The voltage detecting circuit judges whether the ac input end accesses light modulator by detecting the rectified voltage,
When detecting access light modulator, the current control circuit controls the N switch module conducting, controls the 1st~(N-
1) switch module turns off；When detecting that the current control circuit is according to the voltage detecting circuit when not accessing light modulator
Output, control one of switch module conducting in 1~N switch module, control remaining shutdown.
3. the control circuit of lighting circuit according to claim 2, it is characterised in that：When the voltage detecting circuit detects
When to no access light modulator, when the rectified voltage is in kth voltage range, the current control circuit controls kth
Switch module conducting, remaining shutdown, wherein k is the natural number of 1~N.
4. the control circuit of lighting circuit according to claim 2, it is characterised in that：1~N switch module is the
The grid of 1~N MOS, 1~N MOS are the control terminal of 1~N switch module.
5. the control circuit of lighting circuit according to claim 4, it is characterised in that：The lighting circuit includes N number of adopts
Sample resistance, the first end of the N MOS are connected to described with reference to ground, the described 1st~(N-1) by the N sampling resistor
The first end of MOS passes through the first end that the described 1st~(N-1) sampling resistor is connected to the N MOS, the electric current control respectively
Circuit processed receives the first end voltage of the 1~NMOS.
6. the control circuit of lighting circuit according to claim 5, it is characterised in that：When detecting access light modulator,
The current control circuit carries out operation amplifier to the first end voltage of the N MOS, controls the grid electricity of the N MOS
Pressure so that the first end voltage of N MOS close to N reference voltage；When detect do not access light modulator when, the electric current control
Circuit processed carries out operation amplifier to the first end voltage of 1~N MOS according to the output of the voltage detecting circuit, point
The grid voltage for not controlling 1~N MOS makes the first end voltage of 1~N MOS close to 1~N reference voltage.
7. a kind of lighting circuit, it is characterised in that：Including the control circuit as described in claim 1~6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820679058.7U CN208175052U (en) | 2018-05-08 | 2018-05-08 | A kind of control circuit and lighting circuit of lighting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820679058.7U CN208175052U (en) | 2018-05-08 | 2018-05-08 | A kind of control circuit and lighting circuit of lighting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208175052U true CN208175052U (en) | 2018-11-30 |
Family
ID=64366027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820679058.7U Withdrawn - After Issue CN208175052U (en) | 2018-05-08 | 2018-05-08 | A kind of control circuit and lighting circuit of lighting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208175052U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449843A (en) * | 2018-05-08 | 2018-08-24 | 杰华特微电子（杭州）有限公司 | A kind of control circuit of lighting circuit, control method and lighting circuit |
-
2018
- 2018-05-08 CN CN201820679058.7U patent/CN208175052U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108449843A (en) * | 2018-05-08 | 2018-08-24 | 杰华特微电子（杭州）有限公司 | A kind of control circuit of lighting circuit, control method and lighting circuit |
| CN108449843B (en) * | 2018-05-08 | 2024-05-28 | 杰华特微电子股份有限公司 | Control circuit and control method of lighting circuit and lighting circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181130 Effective date of abandoning: 20240528 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181130 Effective date of abandoning: 20240528 |