CN105636307B - The offset voltage of dimming device protection mechanism eliminates circuit structure - Google Patents
The offset voltage of dimming device protection mechanism eliminates circuit structure Download PDFInfo
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- CN105636307B CN105636307B CN201410699558.3A CN201410699558A CN105636307B CN 105636307 B CN105636307 B CN 105636307B CN 201410699558 A CN201410699558 A CN 201410699558A CN 105636307 B CN105636307 B CN 105636307B
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Abstract
A kind of offset voltage elimination circuit structure of dimming device protection mechanism, specifically include that a constant current source that can export stabling current, the output end of the constant current source connects a dim signal input terminal via a current-limiting resistance, the dim signal input terminal dimmer output terminals traditional with an outside are connected, when electric current passes through current-limiting resistance, the current-limiting resistance voltage for causing variation can be generated, one subtracter is connected to constant current source with an input terminal, another input terminal of subtracter can import a deflection reference voltage, one hysteresis comparator is connected to the output end of subtracter with non-inverting input, the inverting input terminal of hysteresis comparator can then input a sawtooth wave；Current-limiting resistance voltage is made it equal to by setting deflection reference voltage, eliminates the current-limiting resistance voltage using subtracter, makes hysteresis comparator that can obtain correct dimming signal voltage, and export the GD pulse signal of an adjustable light brightness.
Description
Technical field:
The present invention is that the offset voltage in relation to a kind of dimming device protection mechanism eliminates circuit structure, and particularly relating to one kind can
Electric current output is provided when linking external electrical resistance type light modulator, and effectively eliminates protection circuit electricity produced by external current-limiting resistance
The circuit structure of pressure difference (offset).
Background technique:
Light-emitting diode LED has the characteristics that low power consuming, long service life, therefore gradually by maturation and has been widely applied
In various lighting demand occasions；But since LED light source component and conventional light source component (such as: osram lamp) have great physics
Property difference, and be suitable for the light adjusting circuit of conventional light source component and the change that LED light source component generates brightness can not be directly controlled
Change, so be connected between LED light source component and traditional light adjusting circuit using a conversion circuit, by the control of traditional light adjusting circuit
The control voltage that making mechanism is converted to controllable LED light source component is for a feasible embodiment.
The light modulator of general traditional lighting is rough to be divided into voltage-type, resistor-type and PWM type, but either any shape
Formula is to export the one 0 simulation light modulation signal to 10V mostly, this voltage represents 0%~100% brightness；And the conversion electricity
Road must then receive the simulation dim signal of 0~10V of above-mentioned conventional dimming apparatus output, and be converted to 0%~100%
The control signal of variation provides different voltages to LED light source component with the additional power supply circuit of driving one, makes LED light source
Component generates different brightness changes.
As shown in Figure 1, being a conversion circuit that can be connected with traditional dimmers, a constant current source A and one is specifically included that
The part such as hysteresis comparator CMP1, wherein the constant current source A be by symmetrical P-type crystal MP1, MP2, MP3, MP4 and
A string of stacked current mirroring circuits of one N-type crystal MN1 composition, it is another with unification the first operational amplifier OPA1, a first resistor R1
Formed, in the first operational amplifier OPA1 non-inverting input for input voltage a V1, the first operational amplifier OPA1
Inverting input terminal be connected to the pole G of N-type crystal MN1, and be grounded via first resistor R1, the pole S of P-type crystal MP4 then links
One output end Pout, output end Pout separately connect a dim signal input terminal Adj_in.
The hysteresis comparator CMP1 is that Pout (i.e. dim signal input terminal is connected to the output with non-inverting input
Adj_in), and the inverting input terminal of hysteresis comparator CMP1 is then for inputting a sawtooth wave.
Please join shown in Fig. 2, foregoing circuit structure in practical application, if in the electricity of dim signal input terminal Adj_in connection one
The output (can be considered a variable resistance RT) of resistance type traditional dimmers, then the constant current source A can be controlled and be exported an electric current I
=V1/R1, the electric current I, which flow through variable resistance RT, can produce a voltage VT=RT*V1/R1, and the voltage VT be can be through
Changed by the resistance value of adjustment variable resistance RT；And voltage VT can be input to hysteresis comparator via output end Pout
CMP1, and compared with the sawtooth wave, and then it is defeated by the GD pulse that hysteresis comparator CMP1 exports an adjustable light brightness
Out, the duty cycle size of the GD output pulse is directly proportional to VT.
Please join shown in Fig. 3, foregoing circuit structure in practical application, if in dim signal input terminal Adj_in connection one electricity
The output (can be considered a DC voltage VA) of die mould traditional dimmers, then DC voltage VA can be input to via output end Pout
Hysteresis comparator CMP1, and an adjustable light brightness is exported compared with the sawtooth wave, and then by hysteresis comparator CMP1
GD pulse output.
Please join shown in Fig. 4, foregoing circuit structure in practical application, if in dim signal input terminal Adj_in connection one
The output of PWM type traditional dimmers can then add an electricity between dim signal input terminal Adj_in and the output end Pout
Rf is hindered, is separately grounded by output end Pout through a capacitor C, a RC oscillating circuit is formed using the resistance Rf and capacitor C, makes PWM
Signal can be through capacitor C charge and discharge and in generating an effective DC voltage VA1 on output end Pout, the voltage VA1 can be via
Output end Pout is input to hysteresis comparator CMP1, and compared with the sawtooth wave, and then defeated by hysteresis comparator CMP1
The GD pulse output of an adjustable light brightness out.
However, in practical application, would generally in above-mentioned dim signal input terminal Adj_in be arranged a current-limiting resistance, with
Protection constant current source A and interlock circuit avoid too high voltages or polarity of voltage be reversely connected and caused by damage；Therefore, in normal use
(especially resistive dimmers are by determining electricity by the dimming signal voltage that dim signal input terminal Adj_in is inputted under situation
Stream source A exports an electric current and is formed by a variable resistance RT), any electric current, which flows through current-limiting resistance, will necessarily generate a limit
Galvanic electricity resistance drop, this current-limiting resistance voltage drop are added with the dim signal input terminal Adj_in voltage for importing or generating, meeting
It generates a variation (offset), it is defeated that such variation will affect the GD pulse that subsequent hysteresis comparator CMP1 is exported
(dimming control voltage) out, it is therefore necessary to be eliminated, can just obtain really necessary dimming signal voltage input.
There is disadvantages mentioned above when application in view of the conversion circuit commonly seen, inventor is for the disadvantage Improvement
Method, have generation of the present invention finally.
Summary of the invention:
The main purpose of the present invention is to provide a kind of offset voltages of dimming device protection mechanism to eliminate circuit structure, is
It is equipped with a subtracter inside circuit, can be eliminated produced by the additional current-limiting resistance of circuit protection mechalusm using the subtracter
Variation (Offset), to obtain correct dimming signal voltage.
Another object of the present invention is to provide a kind of offset voltages of dimming device protection mechanism to eliminate circuit structure, is
It to promote the independence used and convenience, and can be effectively reduced whole by main circuit package in single IC for both
Volume, room for promotion utilization efficiency.
To reach above-mentioned purpose and effect, technological means practiced by the present invention includes: a constant current source, and having one can be defeated
The output end of stabling current out, the output end connect a dim signal input terminal, the dim signal via a current-limiting resistance
The input terminal dimmer output terminals traditional with an outside are connected；One subtracter is by a third operational amplifier and identical
Second and third, four, five resistance formed, second and third described resistance is mutually to concatenate, and is linked to third at second and third resistance concatenation
The non-inverting input of operational amplifier, the other end of second resistance are connected to the output end, another termination of 3rd resistor
Ground, fourth, fifth resistance is mutually to concatenate, and to concatenate the inverting input terminal that position is linked to third operational amplifier,
The other end of four resistance is linked to the output end of third operational amplifier, and the other end of the 5th resistance is for importing deflection reference electricity
Pressure；One hysteresis comparator, has a non-inverting input and an inverting input terminal, and the non-inverting input is connected to third fortune
The output end of amplifier is calculated, the inverting input terminal is then for inputting a sawtooth wave, and the hysteresis comparator separately has an energy defeated
The output end of GD pulse signal out.
According to above structure, wherein the constant current source is to be divided into two groups by four P-type crystals symmetrically to concatenate, wherein one
Group P-type crystal point concatenates a string of stacked current mirroring circuits of N-type crystal composition again, and the N-type crystal separately connects one first
Operational amplifier and a resistance are formed, and the inverting input terminal of first operational amplifier is grounded via aforementioned first resistor,
And another group of P-type crystal then connects an output end.
According to above structure, the 5th resistance connects a four-operational amplifier in one end far from the 4th resistance, described
Four-operational amplifier imports the deflection reference voltage with non-inverting input, and the output end of four-operational amplifier and anti-
Phase input terminal is connected to the 5th resistance simultaneously.
One second operation is equipped with according to above structure, between the output end of the constant current source and the second resistance of subtracter to put
Big device, the second operational amplifier non-inverting input connect the output end of the constant current source, and second operational amplifier
The inverting input terminal of OPA2 connects the output end and second resistance of second operational amplifier simultaneously.
To make above-mentioned purpose of the invention, effect and feature that can obtain more specific understanding, hereby such as according to following drawings explanation
Under:
Schema explanation:
Fig. 1 is one can to dim conversion circuit figure with LED that traditional dimmers are connected.
Fig. 2 is the main circuit diagram of the conversion circuit connection resistance-type traditional dimmers of the 1st figure.
Fig. 3 is the main circuit diagram of the conversion circuit connection voltage-type traditional dimmers of the 1st figure.
Fig. 4 is the main circuit diagram of the conversion circuit connection PWM formula traditional dimmers of the 1st figure.
Fig. 5 is main circuit structure diagram of the invention.
Fig. 6 is the main circuit diagram of present invention connection resistance-type traditional dimmers.
Fig. 7 is the main circuit diagram of present invention connection voltage-type traditional dimmers.
Fig. 8 is the main circuit diagram of present invention connection PWM formula traditional dimmers.
Specific embodiment:
It please join shown in Fig. 5, it is known that circuit structure of the invention specifically includes that a constant current source A, a subtracter B and a magnetic
The part such as stagnant comparator CMP1, wherein constant current source A is brilliant by symmetrical P-type crystal MP1, MP2, MP3, MP4 and a N-type
A string of stacked current mirroring circuits of body MN1 composition, it is another to be formed with the first operational amplifier OPA1 of unification, a first resistor R1,
In the first operational amplifier OPA1 non-inverting input for inputting a voltage V1, the reverse phase of the first operational amplifier OPA1 is defeated
Entering end can be connected to the pole G of N-type crystal MN1, and be grounded via first resistor R1, and the pole S of P-type crystal MP4 then links an output
Pout is held, output end Pout is separately via one dim signal input terminal Adj_in of a current-limiting resistance RL connection.
Subtracter B be by a third operational amplifier OPA3 and it is identical second and third, four, five resistance R2, R3, R4, R5 groups
At described second and third resistance R2, R3 can be concatenated mutually, and be linked to the non-anti-of third operational amplifier OPA3 to concatenate position
Phase input terminal, the other end of second resistance R2 can be connected to output end Pout, the other end ground connection of 3rd resistor R3, and described the
Four, five resistance R4, R5 can be concatenated mutually, and to concatenate the inverting input terminal that position is linked to third operational amplifier OPA3, the
The other end of four resistance R4 can be linked to the output end of third operational amplifier OPA3, and the other end of the 5th resistance R5 is for importing
One deflection reference voltage Voffset.
In a feasible embodiment, one can be connected according to need in the one end of the 5th resistance R5 far from the 4th resistance R4
Four-operational amplifier OPA4, four-operational amplifier OPA4 can import the deflection reference voltage with non-inverting input
Voffset, and the output end of four-operational amplifier OPA4 and inverting input terminal can be connected to the 5th resistance R5 simultaneously；Separately in fixed
It is equipped with a second operational amplifier OPA2 between the second resistance R2 of the output end Pout and subtracter B of current source A, described second
The non-inverting input of operational amplifier OPA2 can connect the output end Pout of constant current source A, and second operational amplifier OPA2
Inverting input terminal can connect the output end and second resistance R2 of second operational amplifier OPA2 simultaneously.
Hysteresis comparator CMP1, has a non-inverting input and an inverting input terminal, and the non-inverting input can connect
It is connected to the output end of third operational amplifier OPA3, and inverting input terminal is then for inputting a sawtooth wave, hysteresis comparator CMP1
Separately there is an output end.
It please join shown in Fig. 6, it is known that when the present invention links a resistance-type traditional dimmers, can be considered and inputted in dim signal
One variable resistance RT of Adj_in connection is held, then the constant current source A can be exported a stable electric current I1 (electric current I1 by control
It can cannot be adjusted, can also be set through resistance R1 for fixation)；It, can after electric current I1 flows through current-limiting resistance RL and variable resistance RT
Generating a current-limiting resistance voltage VL=I1*RL and a variable resistance VT1=I1*RT respectively, (the voltage VT1 is can be with
Change via the resistance value of adjustment variable resistance RT), therefore, the voltage V2=VL+VT1 as derived from output end Pout, wherein
Really necessary dimming signal voltage is for variable resistance VT1, and current-limiting resistance voltage VL is then an offset (Offset)
Voltage.
Assuming that the operational amplifier OPA2 and one voltage V3 (V2=V3) of output of voltage V2 input buffering；And operation amplifier
The exportable deflection reference voltage Voffset of device OPA4；And the reverse phase of operational amplifier OPA3 and noninverting defeated in subtracter B
Enter end and inputs an a voltage V5 and voltage V4 respectively, and the output end of operational amplifier OPA3 has an output voltage Vout；Then
There is Vout=[(1+R4/R5) * V4]-(R4/R5) * Voffset=2V4-Voffset, and
V4=[R3/ (R2+R3)] * V3=0.5*V3, so Vout=V3-Voffset, and because
V2=V3=VL+VT1, so, Vout=VL+VT1-Voffset, if enabling
Voffset=VL can then make Vout=VT1
Therefore, if the non-inverting input importing one in four-operational amplifier OPA4 is equal to current-limiting resistance voltage VL
The deflection reference voltage Voffset of (i.e. I1*RL) size can then effectively eliminate described offset (Offset) voltage (due to electric current
I1 and current-limiting resistance RL is all it is known that therefore learning that the numerical value of current-limiting resistance voltage VL is for simple possible) so that final
The dimming signal voltage VT1 that output voltage Vout=is inputted by dim signal input terminal Adj_in；Then, the output voltage
Vout can be input to hysteresis comparator CMP1, and compared with the sawtooth wave, and then by hysteresis comparator CMP1 output one
The GD pulse of adjustable light brightness exports, and the duty cycle size of the GD pulse output is directly proportional to VT1.
It please join shown in Fig. 7, it is known that when the present invention connects a voltage-type traditional dimmers, can be considered and inputted in dim signal
Adj_in is held to import a DC voltage VA2；When circuit conducting, an electric current is had by current-limiting resistance RL to generate current limliting electricity
Voltage VL1 is hindered, the current-limiting resistance voltage VL1 is to deviate (Offset) voltage.
It therefore, can be by identical mode, if the non-inverting input importing one in four-operational amplifier OPA4 is equal
In the deflection reference voltage Voffset of current-limiting resistance voltage VL1, then it can effectively eliminate described offset (Offset) voltage and (limit
Leakage resistance voltage VL1) so that the dim signal that final output voltage Vout=is inputted by dim signal input terminal Adj_in
Voltage VA2；Then, output voltage Vout can be input to hysteresis comparator CMP1, and compared with the sawtooth wave, Jin Eryou
Hysteresis comparator CMP1 exports the GD pulse output of an adjustable light brightness.
It please join shown in Fig. 8, it is known that when the present invention links a PWM formula traditional dimmers, then can separately be passed through in output end Pout
It is grounded by a capacitor C, forms a RC oscillating circuit using current-limiting resistance RL and capacitor C, make pwm signal can be through capacitor C charge and discharge
And in generating an effective DC voltage VA3 on output end Pout, when circuit conducting, electric current is generated by current-limiting resistance RL
One current-limiting resistance voltage VL3, the current-limiting resistance voltage VL3 is to deviate (Offset) voltage.
It therefore, can be by identical mode, if the non-inverting input importing one in four-operational amplifier OPA4 is equal
In the deflection reference voltage Voffset of current-limiting resistance voltage VL3, then it can effectively eliminate described offset (Offset) voltage and (limit
Leakage resistance voltage VL3) so that the dim signal that the voltage Vout=of final output is inputted by dim signal input terminal Adj_in
Voltage VA3；Then, the output voltage Vout can be input to hysteresis comparator CMP1, and compared with the sawtooth wave, into
And it is exported by the GD pulse that hysteresis comparator CMP1 exports an adjustable light brightness.
Really it may achieve effectively in summary, the offset voltage of dimming device protection mechanism of the present invention eliminates circuit structure
The effect of eliminating voltage difference (offset) produced by external current-limiting resistance.The deep well-off progress applied in the purpose of the present invention and effect
Property, great value of industrial utilization, and be new invention not seen before on the market at present meets Patent Law novelty and progressive
Important document proposes patent application in accordance with the law.
Claims (2)
1. a kind of offset voltage of dimming device protection mechanism eliminates circuit structure, include at least:
One constant current source, including four P-type crystals, four P-type crystals are divided into two groups symmetrically concatenated, wherein one group
P-type crystal concatenates a string of stacked current mirroring circuits of N-type crystal composition, and the N-type crystal connects one first operational amplifier
And first resistor, the inverting input terminal of first operational amplifier is grounded via the first resistor, and another group of P-type crystal
An output end is then connected, the output end connects a dim signal input terminal, the dim signal input via a current-limiting resistance
The dimmer output terminals traditional with an outside are held to be connected；
One subtracter, by a third operational amplifier and it is identical second and third, four, five resistance formed, it is described second and third
Resistance is mutually to concatenate, and the non-inverting input of third operational amplifier, second resistance are connected at second and third resistance concatenation
The other end be connected to aforementioned output end, the other end ground connection of 3rd resistor, fourth, fifth resistance be mutually concatenate, and with
Concatenation position is connected to the inverting input terminal of third operational amplifier, and the other end of the 4th resistance is linked to third operation amplifier
The output end of device, the other end of the 5th resistance subtract for importing a deflection reference voltage, the output end of the constant current source with described
A second operational amplifier is equipped between the second resistance of musical instruments used in a Buddhist or Taoist mass, the connection of this second operational amplifier non-inverting input is described fixed
The output end of current source, and the inverting input terminal of second operational amplifier OPA2 connects the output end of second operational amplifier simultaneously
And second resistance；
One hysteresis comparator, has a non-inverting input and an inverting input terminal, and the non-inverting input is connected to third
The output end of operational amplifier, for the inverting input terminal then for inputting a sawtooth wave, this hysteresis comparator separately has one can export
The output end of GD pulse signal.
2. the offset voltage according to dimming device protection mechanism described in claim 1 eliminates circuit structure, it is characterised in that: institute
It states the 5th resistance and connects a four-operational amplifier in one end far from the 4th resistance, this four-operational amplifier is with noninverting defeated
Enter end and imports the deflection reference voltage, and the output end of four-operational amplifier and inverting input terminal are connected to the 5th electricity simultaneously
Resistance.
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| CN201410699558.3A CN105636307B (en) | 2014-11-28 | 2014-11-28 | The offset voltage of dimming device protection mechanism eliminates circuit structure |
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| CN201410699558.3A CN105636307B (en) | 2014-11-28 | 2014-11-28 | The offset voltage of dimming device protection mechanism eliminates circuit structure |
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| CN105636307B true CN105636307B (en) | 2019-06-21 |
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| JP2012227155A (en) * | 2012-07-11 | 2012-11-15 | Mitsubishi Electric Corp | Light source lighting device and illuminating fixture |
| CN104247573A (en) * | 2012-04-27 | 2014-12-24 | 株式会社巨晶片 | Dimming system, dimming method, program and computer readable memory |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101480105A (en) * | 2006-06-26 | 2009-07-08 | 皇家飞利浦电子股份有限公司 | Drive circuit for driving a load with constant current |
| CN101304237A (en) * | 2007-05-09 | 2008-11-12 | 联詠科技股份有限公司 | Amplifier apparatus capable of eliminating migration voltage |
| CN101340762A (en) * | 2008-08-18 | 2009-01-07 | 友达光电股份有限公司 | Lamp tube detection driving system and related detection driving method |
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