CN102625547B - Dimming signal interface circuit - Google Patents
Dimming signal interface circuit Download PDFInfo
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- CN102625547B CN102625547B CN201210121420.6A CN201210121420A CN102625547B CN 102625547 B CN102625547 B CN 102625547B CN 201210121420 A CN201210121420 A CN 201210121420A CN 102625547 B CN102625547 B CN 102625547B
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Abstract
The invention provides a dimming signal interface circuit which comprises a signal input end, a uniform amplitude module, an average value module, a signal type judgment module, a level gating module, a PWM (Pulse Width Modulation) gating module and a signal output end, wherein after the amplitude of a dimming signal is regulated into a preset value through the uniform amplitude module, the average value module outputs an average value of the signal; the signal type judgment module judges the type of the dimming signal and outputs a level gating signal to the level gating module or outputs a PWM gating signal to the PWM gating module; the level gating module outputs the dimming signal to the signal output end under the action of the level gating signal; and the PWM gating module outputs the output signal of the average value module to the signal output end under the action of the PWM gating signal. The dimming signal interface circuit provided by the invention can be suitable for various kinds of different dimming signals, thus the generality of the dimming circuit is increased.
Description
Technical field
The present invention relates to lighting field, particularly relate to the dim signal interface circuit for light source driving circuit.
Background technology
At lighting field, energy-conservation for realizing, need to for light source configuration, there is the light source driving circuit of dimming function, make the brightness of light source be subject to the control of dim signal.
Connect the light adjusting circuit schematic diagram of light source as shown in Figure 1, light adjusting circuit comprises power supply, light source driving circuit and dim signal input.Light source driving circuit is connected between power supply and light source, for power supply being converted to can driving light source normal luminous power supply, light source driving circuit generally disposes dim signal input, be used for receiving dim signal, according to dim signal, regulate the output of light source driving circuit, thereby adjusting light-source brightness, reaches the object of energy savings.
In prior art, light source driving circuit is directly accepted the dim signal of dim signal input input, the dim signal that can respond has certain restriction, for example, the dim signal that the dim signal of dim signal input input light source driving circuit is 0-10V, the brightness of light source can only change with the amplitude of the level signal between 0-10V, but, for dim signal, be PWM (Pulse Width Modulation, pulse width modulation) during dim signal, light source driving circuit can not regulate according to the variation of the duty ratio (ratio in square wave high level time and cycle) of such dim signal the brightness of light source.In order to adapt to PWM dim signal, need to design the light source driving circuit of corresponding PWM dim signal, increased the R&D costs of light source driving circuit.
Therefore, the existing versatility with the light source driving circuit of dimming function is restricted, and can not be suitable for multiple dim signal simultaneously.
Summary of the invention
The present invention aims to provide a kind of dim signal interface circuit, makes same light source driving circuit can respond multiple dim signal.
In order to achieve the above object, the invention provides a kind of dim signal interface circuit, comprising: signal input part, constant amplitude module, mean value module, signal type judge module, level gating module, pulse width modulation gating module and signal output part, wherein,
Described signal input part, for receiving dim signal;
Described constant amplitude module for receiving described dim signal, and is to export after preset value by the range-adjusting of described dim signal;
Described mean value module, for receiving the output signal of described constant amplitude module, and by the mean value output of described output signal;
Described signal type judge module, for judging the type of described dim signal, if while judgment result is that level signal, output level gating signal is to level gating module; If while judgment result is that pulse width modulating signal, output pulse width modulation gating signal is to pulse width modulation gating module;
Described level gating module, under the effect in described level gating signal, exports described dim signal to described signal output part;
Described pulse width modulation gating module, under the effect in described pulse width modulation gating signal, exports the output signal of described mean value module to described signal output part;
Signal output part, for exporting the output signal of described level gating module or pulse width modulation gating module.
Preferably, described dim signal interface circuit also comprises constant-current source, and the output of described constant-current source connects described signal input part, and described constant-current source is for when the external variable resistor of described signal input part, output current, through variable resistor, makes to produce a variable voltage on variable resistor.
Preferably, described dim signal interface circuit also comprises the first impedance matching module and the second impedance matching module, wherein,
Described the first impedance matching module is serially connected between signal input part and level gating module, or is serially connected between level gating module and signal output part;
Described the second impedance matching module is serially connected between mean value module and pulse width modulation gating module, or is serially connected between pulse width modulation gating module and signal output part;
Described the first impedance matching module and the second impedance matching module have voltage follow effect.
Preferably, described constant amplitude module comprises: constant pressure source, current limliting unit and break-make unit, wherein,
The output of described constant pressure source is connected with the input of described mean value module by current limliting unit, and described break-make unit is connected to the current output terminal of current limliting unit and with reference between ground, the dim signal of signal input part inputs on described break-make unit;
When described dim signal is pulse width modulating signal, the high level of pulse width modulating signal is controlled break-make unit and is turn-offed, break-make cell conduction described in the low level control of pulse width modulating signal.
Preferably, described constant amplitude module comprises: the first amplifying unit and the first clamp units that connect successively, wherein,
Described the first amplifying unit, for amplifying the amplitude of described dim signal with the first preset multiple;
Described the first clamp units, exports as the signal of described constant amplitude module after the default amplitude of clamp to the first for the amplitude of the output signal of the first amplifying unit is carried out.
Preferably, described the first amplifying unit is proportion operational amplifier; Described the first clamp units is voltage-stabiliser tube.
Preferably, described constant amplitude module comprises: the second clamp units and the second amplifying unit that connect successively, wherein,
Described the second clamp units, for presetting amplitude by the amplitude clamp to the second of described dim signal;
Described the second amplifying unit, exports as the signal of described constant amplitude module for the signal amplitude of the second clamp units output being usingd after the second preset multiple is amplified.
Preferably, described the second clamp units is voltage-stabiliser tube; Described the second amplifying unit is proportion operational amplifier.
Preferably, described signal type judge module comprises: square wave detecting unit, the first trigger element and the first state maintain unit, wherein,
Described square wave detecting unit, the rising edge while being pulse width modulating signal for detection of described dim signal or trailing edge are exported first and are controlled signal to described the first trigger element when the rising edge of pulse width modulating signal or trailing edge being detected; When described square wave detecting unit does not detect the rising edge of pulse width modulating signal or trailing edge, output second controls signal to described the first trigger element;
Described the first state maintains unit, for maintaining pulse width modulation gating signal, between two of pulse width modulating signal adjacent rising edges or trailing edge, remains unchanged;
Described the first trigger element, for exporting the judged result of described signal type decision circuitry, when receiving described the second control signal, output level gating signal; When receiving described the first control signal, output pulse width modulation gating signal.
Preferably, described square wave detecting unit is differential circuit unit; Described the first trigger element is switching tube; It is to be connected to described the first trigger element output and with reference to the electric capacity between ground that the first state maintains unit.
Preferably, described signal type judge module comprises: peak value holding unit, the second trigger element and the second state maintain unit, wherein,
Described peak value holding unit, for the maximum amplitude of described dim signal is kept to Preset Time, and inputs to described maximum amplitude the first input end of described the second trigger element; The second input of described the second trigger element receives described dim signal, the second trigger element compares the signal amplitude size of first input end and the second input, when comparative result is greater than or equal to default pressure reduction, output pulse width modulation gating signal, when comparative result is less than default pressure reduction, output level gating signal;
Described the second state maintains unit, for maintaining pulse width modulation gating signal, between two of pulse width modulating signal adjacent rising edges or trailing edge, remains unchanged.
Preferably, described peak value holding unit comprises diode, electric capacity and resistance, the anode of described diode is the input of described peak value holding unit, the negative electrode of described diode connects one end of described electric capacity and described resistance, the negative electrode of described diode is simultaneously as the output of described peak value holding unit, and the other end of described electric capacity and described resistance is connected with reference to ground; Described the second trigger element is switching tube; It is to be connected to described the second trigger element output and with reference to the electric capacity between ground that the second state maintains unit.
Preferably, described mean value module is filter circuit unit; Described level gating module and pulse width modulation gating module are switching tube.
Compared with prior art, method of the present invention has following advantages:
Dim signal interface circuit of the present invention, comprise: signal input part, constant amplitude module, mean value module, signal type judge module, level gating module, PWM gating module and signal output part, wherein, described constant amplitude module, is to export after preset value by the range-adjusting of described dim signal; Described mean value module, by the mean value output of the output signal of described constant amplitude module; Described signal type judge module judges described dim signal type, and output level gating signal is to level gating module or output PWM gating signal to PWM gating module; Described level gating module, under the effect of described level gating signal, exports described dim signal to described signal output part; Described PWM gating module, under the effect of described PWM gating signal, exports the output signal of described mean value module to described signal output part, and signal output part, by the output signal output of described level gating module or PWM gating module.Dim signal interface circuit of the present invention, convert various types of dim signals of signal input part (pwm signal, 0-10V level signal) to light adjusting circuit that unified 0-10V signal exports light source to, wherein, the output signal size of dim signal interface circuit is analogous to the duty ratio of PWM, irrelevant with the amplitude of pwm signal.Therefore dim signal interface circuit of the present invention, makes light adjusting circuit can be applicable to all kinds of different dim signals, has increased the versatility of light adjusting circuit.
In addition, apply dim signal interface circuit of the present invention, need to not design separately corresponding light adjusting circuit for all kinds of different dim signals, reduced R&D costs, simplified light adjusting circuit, reduced the volume of light adjusting circuit.
Accompanying drawing explanation
Shown in accompanying drawing, above-mentioned and other object of the present invention, Characteristics and advantages will be more clear.In whole accompanying drawings, identical Reference numeral is indicated identical part.
Fig. 1 is the light adjusting circuit schematic diagram that connects light source in prior art;
Fig. 2 adopts dim signal interface circuit the first embodiment schematic diagram of the present invention in light adjusting circuit;
Fig. 3 to Fig. 6 is other embodiment schematic diagrames of dim signal interface circuit of the present invention;
Fig. 7 to Fig. 9 is the embodiment schematic diagram of the constant amplitude module of dim signal interface circuit of the present invention;
Figure 10 and Figure 11 are the embodiment schematic diagram of the signal type judge module of dim signal interface circuit of the present invention;
Figure 12 is the embodiment schematic diagram of the peak value holding unit of signal type judge module in the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.For ease of explanation, described schematic diagram is example, and it should not limit the scope of protection of the invention at this.
As described in background, the dim signal that light source driving circuit of the prior art can respond has certain restriction, and the versatility of light source driving circuit is restricted, and can not be suitable for multiple dim signal simultaneously.In order to make light source driving circuit can be applicable to all kinds of different dim signals, increase the versatility of light source driving circuit, the invention provides a kind of dim signal interface circuit, described circuit comprises: signal input part, constant amplitude module, mean value module, signal type judge module, level gating module, pulse width modulation (PWM) gating module and signal output part, wherein
Signal input part, for receiving dim signal;
Constant amplitude module for receiving described dim signal, and is to export after preset value by the range-adjusting of described dim signal;
Mean value module, for receiving the output signal of described constant amplitude module, and by the mean value output of described output signal;
Signal type judge module, for judging the type of described dim signal, if while judgment result is that level signal, output level gating signal is to level gating module; If while judgment result is that pulse width modulating signal, output pulse width modulation gating signal is to pulse width modulation gating module;
Level gating module, under the effect in described level gating signal, the dim signal that described signal input part is received exports signal output part to;
PWM gating module, under the effect in described PWM gating signal, exports the output signal of described mean value module to signal output part;
Signal output part, for exporting the output signal of described level gating module or PWM gating module.
Below in conjunction with accompanying drawing, introduce in detail the embodiment of dim signal interface circuit of the present invention.
Embodiment mono-:
In light adjusting circuit, adopt the schematic diagram of dim signal interface circuit of the present invention referring to Fig. 2, described dim signal interface circuit (shown in dotted line frame) comprising: signal input part In, constant amplitude module 10, mean value module 20, signal type judge module 30, level gating module 40, PWM gating module 50 and signal output part Out.Wherein,
Signal input part In, for receiving dim signal Vin.Described dim signal can be level dim signal, or is PWM dim signal.Visible, be that level dim signal or PWM dim signal all unify to input to same signal input part In.
Constant amplitude module 10, the dim signal Vin receiving for receiving signal input part In, and be to export after preset value by the range-adjusting of described dim signal Vin.No matter the amplitude of dim signal Vin is greater than, is less than or equal the amplitude of V1, and constant amplitude module 10 is converted to this dim signal Vin the signal V1 of default amplitude, but does not change other characteristics of dim signal Vin.Such as, dim signal Vin is pwm signal, be also pwm signal, and the cycle of signal V1 is all identical with Vin with duty ratio through the signal V1 of constant amplitude module output.
Mean value module 20, for receiving the output signal V1 of constant amplitude module 10, and by the average value signal V2 output of described output signal V1.Mean value module 20 is for extracting the average value signal V2 output of constant amplitude module 10 output signal V1; When the dim signal Vin receiving as signal input part In is pwm signal, the amplitude of the output signal V2 of mean value module 20 is analogous to the duty ratio size of pwm signal; When the dim signal Vin receiving as signal input part In is level signal, the amplitude of the output signal V2 of mean value module 20 equals the amplitude of level signal.Described mean value module 20 can be filter circuit.
Signal type judge module 30, for judging the dim signal type of described signal input part, and according to judged result output level gating signal or PWM gating signal to level gating module or PWM gating module.Especially, signal type judge module 30 is for judging that dim signal Vin is level signal or pwm signal, and export corresponding gating signal, if judgement dim signal Vin is level signal, signal type judge module 30 output gating signal S1 are to level gating module 40, if judgement dim signal Vin is pwm signal, signal type judge module output gating signal S2 to PWM gating module 50.
Signal type judge module 30 can directly obtain dim signal Vin for judging dim signal type from signal input part In, and as shown in Figure 2, the input of signal type judge module 30 is directly connected to signal input part In.In addition, because 10 of constant amplitude modules are adjusted the amplitude of dim signal Vin and do not changed signal type, therefore, signal type judge module 30 also can obtain the output signal V1 of constant amplitude module 10 for judging dim signal type, shown in Figure 3, the input of signal type judge module 30 is directly connected to the output of constant amplitude module 10.
Level gating module 40, under the effect at level gating signal S1, the dim signal Vin that described signal input part In is received exports signal output part Out to, and output signal is designated as Vo1.PWM gating module 50, under the effect at described PWM gating signal S2, exports the average value signal V2 of described mean value module 20 outputs to signal output part Out, and output signal is designated as Vo2.Level gating module 40 and PWM gating module 50 comprise switching tube separately, the switching tube conducting under the effect of level gating signal in level gating module, the switching tube conducting under the effect of PWM gating signal in PWM gating module.Because the amplitude of the average value signal V2 of mean value module 20 output is analogous to the duty ratio size of pwm signal, therefore, the large group of amplitude of the output signal Vo2 of PWM gating module 50 is also than the duty ratio size when dim signal Vin is pwm signal.
Signal output part Out, for exporting output signal Vo1 or the Vo2 of described level gating module 40 or PWM gating module 50 to light source driving circuit.Light source driving circuit is converted to can driving light source normal luminous power supply by power supply, and regulates light-source brightness according to the output signal of the signal output part Out of dim signal interface circuit, reaches the object of energy savings.
Preferably, the dim signal interface circuit of the present embodiment also comprises the constant-current source that is connected in signal input part, referring to Fig. 4, while connecting variable resistor when signal input part with between with reference to ground, the electric current of constant-current source output is through variable resistor, produce a variable voltage thereon, the variable voltage producing on described variable resistor inputs to the signal input part of dim signal interface circuit, through level gating module, export this variable voltage to signal output part, thereby light source driving circuit can respond the brightness that variable-resistance resistance removes to regulate light source.Visible, the variable voltage producing on described variable resistor belongs to level dim signal.
The dim signal interface circuit of the present embodiment is for replacing the dim signal input of Fig. 1, exports light source driving circuit to after being converted to level signal Vo by various types of dim signals (pwm signal and level signal) are unified.Therefore,, as long as light source driving circuit can response levels signal Vo regulates the brightness of light source, in conjunction with described dim signal interface circuit, thereby light source driving circuit also can respond the brightness that pwm signal regulates light source in the situation that not making any change.
Embodiment bis-:
Referring to Fig. 5 and Fig. 6, on the basis of embodiment mono-, the dim signal interface circuit of the present embodiment (shown in dotted line frame), comprising: signal input part, constant amplitude module 10, mean value module 20, signal type judge module 30, level gating module 40, PWM gating module 50, the first impedance matching module 60 and the second impedance matching module 70 and signal output part.Wherein, function and the result of constant amplitude module 10, mean value module 20, signal type judge module 30, signal type judge module 40 and PWM gating module 50 are identical with embodiment mono-, here repeat no more.
Described the first impedance matching module 60 is serially connected between signal input part and level gating module 40, or described the first impedance matching circuit 60 is serially connected between level gating module 40 and signal output part.Level gating module 40 is under the effect of level gating signal S1, and the dim signal Vin that described signal input part is received exports signal output part to, and output signal is designated as Vo3.
Described the second impedance matching module 70 is serially connected between mean value module 20 and PWM gating module 50, or described the second impedance matching module 70 is serially connected between PWM gating module 50 and signal output part.PWM gating module 50, under the effect of described PWM gating signal S2, exports the average value signal V2 of described mean value module 20 outputs to signal output part, and output signal is designated as Vo4.
Increase that the first impedance matching module 60 and the second impedance matching module 70 can avoid being positioned at rear class module after impedance matching module or the impedance magnitude of light source driving circuit affect the dim signal size of signal input part, thereby avoid the precision of impact adjusting light-source brightness.
It should be noted that, the first impedance matching module and the second impedance matching module have voltage follow effect, input voltage and the output voltage of impedance matching module are equated, described the first impedance matching module and the second impedance matching module can be the voltage follower circuit of amplifier or triode composition.
In embodiment mono-and embodiment bis-, the constant amplitude module in dimming interface circuit has various structures.
Embodiment tri-:
Referring to Fig. 7, structural representation for the constant amplitude module in dimming interface circuit, described constant amplitude module 101 (shown in dotted line frame) comprising: constant pressure source, current limliting unit and break-make unit, the output of constant pressure source is connected with the input of described mean value module by current limliting unit, break-make unit is connected to the output of current limliting unit and with reference between ground, the dim signal Vin of signal input part inputs to break-make unit, for controlling the break-make of break-make unit.
In the present embodiment, when dim signal Vin is level signal, the conducting of level gating module, PWM gating module shuts down, the output signal size of constant amplitude module 101 that now it doesn't matter, therefore, repeating no more described break-make unit is here the break-make situation under level signal effect at dim signal Vin.When dim signal Vin is pwm signal, the high level of pwm signal is controlled break-make unit and is turn-offed, the low level control break-make cell conduction of pwm signal.
Illustrate, when dim signal Vin is pwm signal, the high level of pwm signal is controlled break-make unit and is turn-offed, and the output voltage V 1 of constant amplitude module 101 is about the output voltage V d of constant pressure source, presents the fixing high level of amplitude; The low level control break-make cell conduction of pwm signal, the output voltage V 1 of constant amplitude module 101 be pulled to reference to present low level.Therefore, the pwm signal of amplitude can be converted to amplitude through constant amplitude module and approach constant pressure source output voltage V d, the pwm signal that duty ratio is constant arbitrarily.
Current limliting unit in the present embodiment can be resistance; Break-make unit can be switching tube.
Embodiment tetra-:
Referring to Fig. 8, structural representation for constant amplitude module in dimming interface circuit, described constant amplitude module 102 (shown in dotted line frame) comprising: the first amplifying unit and the first clamp units that connect successively, wherein, the first amplifying unit is for amplifying the amplitude of the dim signal Vin of signal input part with the first preset multiple; The first clamp units is exported as the signal of constant amplitude module 102 after the default amplitude of clamp to the first for the amplitude of the output signal of the first amplifying unit is carried out.
Because the amplitude of the pwm signal of signal input part input is fixing, in order to make the signal amplitude of signal output part output be analogous to the duty ratio of pwm signal, and irrelevant with the amplitude of pwm signal, need through constant amplitude the regulation of electrical circuit, be the first default amplitude by the amplitude of pwm signal.The operation principle of the constant amplitude module 101 in the present embodiment is: the first default amplitude V
fmaximum for the level signal of signal output part.Such as, the level signal scope of signal output part is 0-10V, the described first default amplitude is 10V.If the amplitude excursion of pwm signal is [V
f1, V
f2], the first multiplication factor of the first amplifying unit is greater than or equal to V
f/ V
f1the amplitude of pwm signal is at [V
f1, V
f2] between while changing, the output signal amplitude of the first amplifying unit is more than or equal to V all the time
f, through the first clamp units, the amplitude clamp of pwm signal is to V
f.Visible, no matter the amplitude size of the pwm signal of signal input part is to be greater than V
fstill be less than V
f, through constant amplitude module, can unify to be adjusted into V
f.
Described the first amplifying unit can be general proportion operational amplifier, and described the first clamp units can be voltage-stabiliser tube, and the threshold values of voltage-stabiliser tube is the first default amplitude V
f.
Preferably, referring to Fig. 9, another example structure schematic diagram for constant amplitude module in the dimming interface circuit of this reality invention, described constant amplitude module 103 (shown in dotted line frame) comprising: the second clamp units and the second amplifying unit that connect successively, wherein, the second clamp units is for by the default amplitude of the amplitude clamp to the second of the dim signal Vin of signal input part, the second amplifying unit for the signal amplitude of the second clamp units output is usingd the second preset multiple amplify after as the signal V1 output of constant amplitude module 103.
The described second default amplitude V
gthe minimum amplitude when dim signal that is less than or equal to signal input part is PWM, such as, the amplitude excursion of pwm signal is [V
f1, V
f2], the second default amplitude V
gbe less than or equal to V
f1, it is V by amplitude that the second amplifying unit be take the second multiplication factor
gpwm signal to be amplified to amplitude be V
fpwm signal, wherein, V
fmaximum for the level signal of signal output part.Such as, the level signal scope of signal output part is 0-10V, V
fbe 10V.
Described the second clamp units can be voltage-stabiliser tube, and the second amplifying unit can be proportion operational amplifier.
In embodiment mono-, embodiment bis-, embodiment tri-and embodiment tetra-, the signal type judge module in dimming interface circuit has various structures.
Embodiment five:
Referring to Figure 10, be the structural representation of signal type judge module in dimming interface circuit, described signal type judge module 301 (shown in dotted line frame) comprising: square wave detecting unit, the first trigger element and the first state maintain unit; Rising edge or trailing edge when square wave detecting unit is PWM for detection of the dim signal Vin of signal input part are exported first and are controlled signal to the first trigger element when the rising edge of pwm signal or trailing edge being detected; When described square wave detecting unit does not detect the rising edge of pwm signal or trailing edge, export second and control signal to the first trigger element.The first trigger element is used for exporting the judged result of described signal type decision circuitry, when receiving the second control signal of square wave detecting unit output, and output level gating signal; When receiving the first control signal of square wave detecting unit output, output PWM gating signal.The first state maintains unit and remains unchanged in two of pwm signal adjacent rising edges or trailing edge interval time (being the one-period of pwm signal) for maintaining PWM gating signal.
Described PWM gating signal remains unchanged and refers in two of pwm signal adjacent rising edges or trailing edge interval time (being the one-period of pwm signal), in one-period when dim signal is pwm signal, the PWM gating signal of signal type decision circuitry output can not become level gating signal.
For pedestal level gating signal and PWM gating signal, can be by the corresponding PWM gating signal of the high level signal of the first trigger element output, by the corresponding level gating signal of the low level signal of the first trigger element output.Described square wave detecting unit can be differential circuit unit, output pulse signal when the rising edge of square-wave signal or trailing edge being detected.The first state maintains unit can be for being connected to the first trigger element and with reference to the electric capacity between ground, in cycle when being greater than dim signal the discharge time of electric capacity and being pwm signal by arranging, guarantee that PWM gating signal remains unchanged in two of pwm signal adjacent rising edges or trailing edge interval time (being the cycle of pwm signal).Described the first trigger element comprises switching tube, and this switching tube is break-make under the first control signal of square wave detecting unit output and the effect of the second control signal.The course of work of described signal type judge module is as follows: when the dim signal Vin of signal input part is level signal, it is 0, the first trigger element output low level, i.e. output level gating signal that differential circuit is exported the second control signal; When the dim signal Vin of signal input part is pwm signal, differential circuit is at rising edge or the falling edge output pulse signal of pwm signal, this pulse signal acts on the first trigger element, make its output high level (PWM gating signal) and maintain the capacitor charging in unit to the first state, due to the cycle arranging when being greater than dim signal the discharge time of electric capacity and being pwm signal, electric capacity can maintain this high level until the arriving of next pulse signal again to described capacitor charging.
Embodiment six:
Referring to Figure 11, structural representation for signal type judge module in dimming interface circuit, described signal type judge module 302 (shown in dotted line frame) comprising: peak value holding unit, the second trigger element and the second state maintain unit, wherein, peak value holding unit is used for the maximum amplitude of the dim signal Vin of signal input part to keep Preset Time, and this maximum amplitude is inputed to the first input end 303 of the second trigger element; The second input 304 of the second trigger element receives the dim signal Vin of signal input part, the second trigger element compares the signal amplitude size of first input end and the second input, when comparative result is greater than or equal to default pressure reduction, output PWM gating signal, when comparative result is less than default pressure reduction, output level gating signal; The second state maintains unit and remains unchanged in two of pwm signal adjacent rising edges or trailing edge interval time (being the one-period of pwm signal) for maintaining PWM gating signal.Described PWM gating signal remains unchanged and refers in two of pwm signal adjacent rising edges or trailing edge interval time (being the one-period of pwm signal), in one-period when dim signal is pwm signal, the PWM gating signal of signal type decision circuitry output can not become level gating signal.
PWM gating signal is the high level signal of the second trigger element output, and level gating signal is the low level signal of the second trigger element output.Referring to Figure 12, described peak value holding unit 305 comprises diode D1, capacitor C 1 and resistance R 1, the anode of diode D1 is the input of described peak value holding unit, the negative electrode of diode D1 connects one end of capacitor C 1 and resistance R 1, the negative electrode of diode D1 connects described the second trigger element as the output of described peak value holding unit simultaneously, and the other end of capacitor C 1 and resistance R 1 is connected with reference to ground.Visible, the dim signal Vin of signal input part charges to capacitor C 1 through diode D1, the voltage magnitude of capacitor C 1 is the maximum amplitude of dim signal Vin, capacitor C 1 is discharged by resistance R 1,, by the size of resistance R 1 is set, can determine that capacitor C 1 keeps the Preset Time of described maximum amplitude.It can be electric capacity that the second state maintains unit, in cycle when being greater than dim signal the discharge time of electric capacity and being pwm signal by arranging, guarantee that PWM gating signal remains unchanged in two of pwm signal adjacent rising edges or trailing edge interval time (being the cycle of pwm signal).Described the second trigger element comprises switching tube.The operation principle of described signal type judge module is as follows: when the dim signal of signal input part is level signal, the output signal amplitude of peak value holding unit is identical with its input end signal amplitude, the signal amplitude of the first input end of the second trigger element and the second input equates, the second trigger element output low level, i.e. level gating signal, when the signal of signal input part is pwm signal, the high level amplitude that the output signal amplitude of peak value holding unit is pwm signal and maintain Preset Time, when the second input of the second trigger element receives the low level of pwm signal, because peak value holding unit still maintains the high level of output pwm signal, between the first input end of the second trigger element and the second input, exist pressure reduction to control the second trigger element output high level, and maintain the capacitor charging in unit to the second state, due to the cycle arranging when being greater than dim signal the discharge time of electric capacity and being pwm signal, this electric capacity can maintain this high level until described capacitor charging is given in the arriving of next pulse signal again, therefore, during the signal of signal input part is pwm signal, signal type decision circuitry can continue to export PWM gating signal.
It should be noted that, in embodiment five and embodiment six, the input of described signal type judge module be all the dim signal that receives signal input part be that example describes, but be not limited thereto, also can obtain the output signal V1 of constant amplitude module 10 for judging dim signal type.
Light source described in the present invention can be LED.
Switching tube described in the present invention can be triode, metal-oxide-semiconductor, IGBT etc.
The above, be only the preferred embodiment of dim signal interface circuit provided by the present invention, not the present invention done to any pro forma restriction.Any those of ordinary skill in the art, do not departing from technical solution of the present invention scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible changes and modification to technical solution of the present invention, or be revised as the equivalent embodiment of equivalent variations.Therefore, every content that does not depart from technical solution of the present invention, to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs to the scope of technical solution of the present invention protection according to technical spirit of the present invention.
Claims (13)
1. a dim signal interface circuit, after being converted to level signal, dim signal unification exports light source driving circuit to, it is characterized in that, comprise: signal input part, constant amplitude module, mean value module, signal type judge module, level gating module, pulse width modulation gating module and signal output part, wherein
Described signal input part, for receiving dim signal, described dim signal is level dim signal, or is pulse width modulation (PWM) dim signal;
Described constant amplitude module, for receiving described dim signal, and is the signal output after preset value by the range-adjusting of described dim signal, is specially: constant amplitude module is converted to this dim signal the signal of default amplitude, but does not change other characteristics of dim signal;
Described mean value module, for receiving the output signal of described constant amplitude module, and by the average value signal output of described output signal;
Described signal type judge module, for judging the type of described dim signal, if while judgment result is that level signal, output level gating signal is to level gating module; If while judgment result is that pulse width modulating signal, output pulse width modulation gating signal is to pulse width modulation gating module;
Described level gating module, under the effect in described level gating signal, exports described level dim signal to described signal output part;
Described pulse width modulation gating module, under the effect in described pulse width modulation gating signal, exports the output signal of described mean value module to described signal output part;
Signal output part, for exporting the output signal of described level gating module or pulse width modulation gating module.
2. dim signal interface circuit according to claim 1, it is characterized in that, also comprise constant-current source, the output of described constant-current source connects described signal input part, described constant-current source is for when the external variable resistor of described signal input part, output current, through variable resistor, makes to produce a variable voltage on variable resistor.
3. dim signal interface circuit according to claim 1, is characterized in that, also comprises the first impedance matching module and the second impedance matching module, wherein,
Described the first impedance matching module is serially connected between signal input part and level gating module, or is serially connected between level gating module and signal output part;
Described the second impedance matching module is serially connected between mean value module and pulse width modulation gating module, or is serially connected between pulse width modulation gating module and signal output part;
Described the first impedance matching module and the second impedance matching module have voltage follow effect.
4. according to the dim signal interface circuit described in claim 1-3 any one, it is characterized in that, described constant amplitude module comprises: constant pressure source, current limliting unit and break-make unit, wherein,
The output of described constant pressure source is connected with the input of described mean value module by current limliting unit, and described break-make unit is connected to the current output terminal of current limliting unit and with reference between ground, the dim signal of signal input part inputs on described break-make unit;
When described dim signal is pulse width modulating signal, the high level of pulse width modulating signal is controlled break-make unit and is turn-offed, break-make cell conduction described in the low level control of pulse width modulating signal.
5. according to the dim signal interface circuit described in claim 1-3 any one, it is characterized in that, described constant amplitude module comprises: the first amplifying unit and the first clamp units that connect successively, wherein,
Described the first amplifying unit, for amplifying the amplitude of described dim signal with the first preset multiple;
Described the first clamp units, exports as the signal of described constant amplitude module after the default amplitude of clamp to the first for the amplitude of the output signal of the first amplifying unit is carried out.
6. dim signal interface circuit according to claim 5, is characterized in that,
Described the first amplifying unit is proportion operational amplifier; Described the first clamp units is voltage-stabiliser tube.
7. according to the dim signal interface circuit described in claim 1-3 any one, it is characterized in that, described constant amplitude module comprises: the second clamp units and the second amplifying unit that connect successively, wherein,
Described the second clamp units, for presetting amplitude by the amplitude clamp to the second of described dim signal;
Described the second amplifying unit, exports as the signal of described constant amplitude module for the signal amplitude of the second clamp units output being usingd after the second preset multiple is amplified.
8. dim signal interface circuit according to claim 7, is characterized in that,
Described the second clamp units is voltage-stabiliser tube; Described the second amplifying unit is proportion operational amplifier.
9. according to the dim signal interface circuit described in claim 1-3 any one, it is characterized in that, described signal type judge module comprises: square wave detecting unit, the first trigger element and the first state maintain unit, wherein,
Described square wave detecting unit, the rising edge while being pulse width modulating signal for detection of described dim signal or trailing edge are exported first and are controlled signal to described the first trigger element when the rising edge of pulse width modulating signal or trailing edge being detected; When described square wave detecting unit does not detect the rising edge of pulse width modulating signal or trailing edge, output second controls signal to described the first trigger element;
Described the first state maintains unit, for maintaining pulse width modulation gating signal, between two of pulse width modulating signal adjacent rising edges or trailing edge, remains unchanged;
Described the first trigger element, for exporting the judged result of described signal type judge module, when receiving described the second control signal, output level gating signal; When receiving described the first control signal, output pulse width modulation gating signal.
10. dim signal interface circuit according to claim 9, is characterized in that,
Described square wave detecting unit is differential circuit unit; Described the first trigger element is switching tube; It is to be connected to described the first trigger element output and with reference to the electric capacity between ground that the first state maintains unit.
11. according to the dim signal interface circuit described in claim 1-3 any one, it is characterized in that, described signal type judge module comprises: peak value holding unit, the second trigger element and the second state maintain unit, wherein,
Described peak value holding unit, for the maximum amplitude of described dim signal is kept to Preset Time, and inputs to described maximum amplitude the first input end of described the second trigger element; The second input of described the second trigger element receives described dim signal, the second trigger element compares the signal amplitude size of first input end and the second input, when comparative result is greater than or equal to default pressure reduction, output pulse width modulation gating signal, when comparative result is less than default pressure reduction, output level gating signal;
Described the second state maintains unit, for maintaining pulse width modulation gating signal, between two of pulse width modulating signal adjacent rising edges or trailing edge, remains unchanged.
12. dim signal interface circuits according to claim 11, is characterized in that,
Described peak value holding unit comprises diode, electric capacity and resistance, the anode of described diode is the input of described peak value holding unit, the negative electrode of described diode connects one end of described electric capacity and described resistance, the negative electrode of described diode is simultaneously as the output of described peak value holding unit, and the other end of described electric capacity and described resistance is connected with reference to ground; Described the second trigger element is switching tube; It is to be connected to described the second trigger element output and with reference to the electric capacity between ground that the second state maintains unit.
13. according to the dim signal interface circuit described in claim 1-3 any one, it is characterized in that, described mean value module is filter circuit unit; Described level gating module and pulse width modulation gating module are switching tube.
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| US10830880B2 (en) * | 2018-03-20 | 2020-11-10 | Panosense Inc. | Selecting LIDAR pulse detector depending on pulse type |
| TWI718845B (en) * | 2020-01-16 | 2021-02-11 | 立錡科技股份有限公司 | Dimmer interface circuit and buffer stage circuit thereof |
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