CN108696972A - A kind of light modulating device and system - Google Patents
A kind of light modulating device and system Download PDFInfo
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- CN108696972A CN108696972A CN201710228864.2A CN201710228864A CN108696972A CN 108696972 A CN108696972 A CN 108696972A CN 201710228864 A CN201710228864 A CN 201710228864A CN 108696972 A CN108696972 A CN 108696972A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The invention belongs to power control field, a kind of light modulating device and system are provided;In the present invention, after the power is turned on, filter module generates first voltage according to the pulse-width signal that control module exports, drive module generates the first drive signal, circuit of reversed excitation module is connected according to the first drive signal and exports electric current and load voltage to be measured, current detection module generates the first ramp voltage risen according to electric current to be measured, when the first ramp voltage is more than first threshold, drive module generates the second drive signal according to the first ramp voltage, circuit of reversed excitation module is ended according to the second drive signal, and generate the second ramp voltage declined, when the second ramp voltage is less than second threshold, voltage detection module generates conductivity control signal;Switch module ends according to the second drive signal, and drive module generates the first drive signal so that circuit of reversed excitation module and switch module is connected according to conductivity control signal;Therefore light modulating device can be made to work normally.
Description
Technical field
The invention belongs to power control field more particularly to a kind of light modulating device and systems.
Background technology
In the prior art, as shown in Figure 1, light modulating device 10 is powered load 07 comprising control module 01, filter
Wave module 02, drive module 03 and circuit of reversed excitation module 04;After the power is turned on, the arteries and veins that filter module 02 is exported according to control module 01
Wide modulated signal generates first voltage, when circuit of reversed excitation module 04 is ended and stops output loading voltage, can generate delay
Conductivity control signal,;But due to the presence of first voltage, therefore drive module 03 can not be generated according to the conductivity control signal
First drive signal is to be connected circuit of reversed excitation module 04.
Therefore, the first voltage of prior art filter module output influences drive module always, so as to cause adjusting apparatus
The problem of can not work normally.
Invention content
The present invention provides a kind of light modulating device and systems, it is intended to solve the first electricity that the prior art is exported by filter module
The problem of pressure influences drive module, can not work normally so as to cause adjusting apparatus always.
The invention is realized in this way a kind of light modulating device comprising control module, filter module, drive module, flyback
Circuit module, current detection module, voltage detection module and switch module;
The output end of the control module is connect with the input terminal of the filter module, the output end of the filter module with
The first input end of the switch module connects, the second input terminal of the output end of the drive module and the switch module and
The input terminal of the circuit of reversed excitation module connects, the output end of the input terminal of the drive module and the switch module, described
The output end of current detection module and the connection of the output end of the voltage detection module, the first of the circuit of reversed excitation module are defeated
Outlet is connect with the input terminal of the current detection module, third output end and the voltage detecting of the circuit of reversed excitation module
The input terminal of module connects, and the second output terminal of the circuit of reversed excitation module is connected with the load;
After the power is turned on, the filter module generates first voltage, institute according to the pulse-width signal that the control module exports
It states drive module and generates the first drive signal, the circuit of reversed excitation module is connected and exports to be measured according to first drive signal
Electric current and load voltage, the load voltage are powered load, and the current detection module is given birth to according to the electric current to be measured
At the first ramp voltage of rising, when first ramp voltage is more than first threshold, the drive module is according to described the
One ramp voltage generates the second drive signal, and the circuit of reversed excitation module ends according to second drive signal and stops exporting
The load voltage, and the second ramp voltage declined is generated, the electricity when second ramp voltage is less than second threshold
Detection module is pressed to generate conductivity control signal, the switch module ends according to second drive signal, the drive module
First drive signal is generated so that the circuit of reversed excitation module and the switch module is connected according to the conductivity control signal.
The present invention also provides light adjusting systems comprising load and above-mentioned light modulating device.
The advantageous effect that technical solution provided by the invention is brought is:As can be seen from the above-mentioned present invention, due to light modulating device packet
Include control module, filter module, drive module, circuit of reversed excitation module, current detection module, voltage detection module and switching molding
Block;After the power is turned on, filter module generates first voltage according to the pulse-width signal that control module exports, and drive module generates first
Drive signal, circuit of reversed excitation module are connected according to the first drive signal and export electric current and load voltage to be measured, current detecting mould
Root tuber generates the first ramp voltage risen according to electric current to be measured, when the first ramp voltage is more than first threshold, drive module root
The second drive signal is generated according to the first ramp voltage, circuit of reversed excitation module is ended according to the second drive signal, and generates decline
Second ramp voltage, when the second ramp voltage is less than second threshold, voltage detection module generates conductivity control signal;Switching molding
Root tuber is ended according to the second drive signal so that drive module generates the first drive signal so that flyback is connected according to conductivity control signal
Circuit module and switch module;Since switch module ends according to the second drive signal, so that drive module is able to detect that electricity
It presses the conductivity control signal that detection module generates and generates the first drive signal circuit of reversed excitation module is connected, so tune can be made
Electro-optical device works normally.
Description of the drawings
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
The function structure chart of the light modulating device of Fig. 1 prior arts;
Fig. 2 is a kind of function structure chart of light modulating device provided in an embodiment of the present invention;
Fig. 3 is a kind of exemplary circuit structure chart of light modulating device provided in an embodiment of the present invention.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 2 shows the modular structures of light modulating device provided in an embodiment of the present invention, for convenience of description, illustrate only with
The relevant part of the embodiment of the present invention, details are as follows:
A kind of light modulating device 10 comprising control module 01, filter module 02, drive module 03, circuit of reversed excitation module 04,
Current detection module 05, voltage detection module 06 and switch module 08.
Wherein, the input terminal of the output end with filter module 02 of control module 01 is connect, the output end of filter module 02 with
The first input end of switch module 08 connects, the output end of drive module 03 and the second input terminal of switch module 08 and flyback electricity
The input terminal of road module 04 connects, the input terminal of drive module 03 and the output end of switch module 08, current detection module 05
Output end and the connection of the output end of voltage detection module 06, the first output end and current detection module of circuit of reversed excitation module 04
05 input terminal connection, the third output end of circuit of reversed excitation module 04 are connect with the input terminal of voltage detection module 06, flyback electricity
The second output terminal of road module 04 is connect with load 07.
After the power is turned on, filter module 02 generates first voltage according to the pulse-width signal that control module 01 exports, and drives mould
Block 03 generates the first drive signal, and circuit of reversed excitation module 04 is connected according to the first drive signal and exports electric current to be measured and load electricity
Pressure, load voltage are powered load 07, and current detection module 05 generates the first ramp voltage risen according to electric current to be measured,
When the first ramp voltage is more than first threshold, drive module 03 generates the second drive signal, flyback according to the first ramp voltage
Circuit module 04 ends according to the second drive signal and stops output loading voltage, and generates the second ramp voltage declined, when
Voltage detection module 06 generates conductivity control signal when second ramp voltage is less than second threshold,
Switch module 08 ends according to the second drive signal, and drive module 03 generates the first driving according to conductivity control signal
Signal is to be connected circuit of reversed excitation module 04 and switch module 08.
In above-mentioned light modulating device 10, when institute's circuit of reversed excitation module 04 and the conducting of switch module 08, switch module 08 is given birth to
At second voltage, circuit of reversed excitation module 04 exports electric current and load voltage to be measured, and current detection module 05 is given birth to according to electric current to be measured
At the first ramp voltage of rising, second voltage and the first ramp voltage are superimposed to form tertiary voltage, when tertiary voltage is more than the
When one threshold value, drive module 03 generates the second drive signal according to tertiary voltage.
In above-mentioned light modulating device 10, the duty ratio of 01 adjusting pulsewidth modulated signal of control module adjusts first voltage, the
Two voltages and tertiary voltage are to control the turn-on time of circuit of reversed excitation module 04.
It can be seen that can increase control module 01 output pulse-width signal duty ratio, increase first voltage and
Second voltage, and then increase tertiary voltage, to make the conducting of circuit of reversed excitation module 04 in advance, so that the power of load voltage increases
Greatly;The duty ratio that the pulse-width signal of the output of control module 01 can also be reduced, reduces first voltage and second voltage, in turn
Reduce tertiary voltage, to postpone the conducting of circuit of reversed excitation module 04, so that the power of load voltage reduces.
Fig. 3 shows a kind of exemplary circuit structure of light modulating device 10 provided in an embodiment of the present invention, for convenience of description,
Illustrate only with the relevant part of the embodiment of the present invention, details are as follows:
Switch module 08 includes the first field-effect tube Q1, the second field-effect tube Q2, first resistor R1 and 3rd resistor R3;
The source electrode of first field-effect tube Q1 is connect with the first end of 3rd resistor R3, and the second end of 3rd resistor R3 is switch module 08
The drain electrode of output end, the first field-effect tube Q1 is connect with the drain electrode of the second field-effect tube Q2, and the source electrode of the second field-effect tube Q2 is
The first input end of switch module 08, the grid and first resistor of the grid of the first field-effect tube Q1 and the second field-effect tube Q2
The first end of R1 connects, and the second end of first resistor R1 is the second input terminal of switch module 08.
Filter module 02 includes second resistance R2 and the first capacitance C1;The first end of second resistance R2 is filter module 02
The first end of input terminal, the second end of second resistance R2 and the first capacitance C1 are the output end of filter module 02, the first capacitance C1
Second end connect with power ground.
Drive module 03 is power supply control chip U1;The voltage and current test side Zx& of power supply control chip U1;Isense
For the input terminal of drive module 03, the driving voltage output end Driver of power supply control chip U1 is the output of drive module 03
End.
Circuit of reversed excitation module 04 includes transformer T1 and third field-effect tube Q3;The first end of the primary side winding of transformer T1
It is connect with external power supply, the second end of the primary side winding of transformer T1 is connect with the source electrode of third field-effect tube Q3, third field effect
Should pipe Q3 grid be circuit of reversed excitation module 04 input terminal, the drain electrode of third field-effect tube Q3 is the of circuit of reversed excitation module 04
One output end, the first end of the first vice-side winding of transformer T1 are the second output terminal of circuit of reversed excitation module 04, transformer T1
The second vice-side winding first end be circuit of reversed excitation module 04 third output end, the of the first vice-side winding of transformer T1
The second end of the second vice-side winding of two ends and transformer T1 is connected to power ground altogether.
Current detection module 05 includes the 4th resistance R4 and the 5th resistance R5;The first end and the 5th resistance of 4th resistance R4
The first end of R5 is the input terminal of current detection module 05, and the second end of the 5th resistance R5 is the output of current detection module 05
End, the second end of the 4th resistance R4 are connect with power ground.
Light modulating device 10 shown in Fig. 3 is described further below in conjunction with operation principle:
After the power is turned on, the first capacitance C1 generates first voltage, power supply control according to the pulse-width signal that control module 01 exports
Coremaking piece U1 generates the first drive signal (high level signal) and is exported from driving voltage output end Driver, third field-effect tube
Q3 is connected according to the first drive signal and exports electric current to be measured, the first secondary side of transformer T1 from the drain electrode of third field-effect tube Q3
The first end output loading voltage of winding, load voltage are powered load 07, and the 4th resistance R4 is generated according to electric current to be measured
First ramp voltage of rising is simultaneously exported from the second end of the 5th resistance R5, when the first ramp voltage is more than first threshold, electricity
Source controls chip U1 and generates the second drive signal (low level signal) according to the first ramp voltage, and third field-effect tube Q3 is according to the
Two driving signal ends, and transformer T1 simultaneously stops output loading voltage, and the first end of the second vice-side winding in transformer T1
The second ramp voltage declined is generated, voltage detection module 06 generates conducting control when the second ramp voltage is less than second threshold
Signal (low level signal);First field-effect tube Q1 and the second field-effect tube Q2 end according to the second drive signal, power supply control
Chip U1 according to conductivity control signal generate the first drive signal be connected the first field-effect tube Q1, the second field-effect tube Q2 and
Third field-effect tube Q3.
As the first field-effect tube Q1, the second field-effect tube Q2 and the Q3 conductings of third field-effect tube, 3rd resistor R3
Second end export second voltage, the drain electrode of third field-effect tube Q3 exports electric current to be measured, the first vice-side winding of transformer T1
First end output loading voltage, the 4th resistance R4 according to electric current to be measured generate rise the first ramp voltage, second voltage and
First ramp voltage is superimposed to form tertiary voltage, and when tertiary voltage is more than first threshold, power supply control chip U1 is according to third
Voltage generates the second drive signal and is exported from driving voltage output end Driver.
Normal work is realized based on above-mentioned light modulating device 10, therefore the embodiment of the present invention also provides a kind of light adjusting system,
It includes load and above-mentioned light modulating device 10.
In conclusion the embodiment of the present invention includes control module, filter module, drive module, circuit of reversed excitation mould by it
Block, current detection module, voltage detection module and switch module;After the power is turned on, the arteries and veins that filter module is exported according to control module
Wide modulated signal generates first voltage, and drive module generates the first drive signal, and circuit of reversed excitation module is according to the first drive signal
Electric current and load voltage to be measured are connected and export, current detection module generates the first ramp voltage risen according to electric current to be measured,
When the first ramp voltage is more than first threshold, drive module generates the second drive signal, flyback electricity according to the first ramp voltage
Road module is ended according to the second drive signal, and generates the second ramp voltage declined, when the second ramp voltage is less than the second threshold
Voltage detection module generates conductivity control signal when value;Switch module ended according to the second drive signal so that drive module according to
Conductivity control signal generates the first drive signal so that circuit of reversed excitation module and switch module is connected;Since switch module is according to second
Drive signal ends, and is driven so that drive module is able to detect that the conductivity control signal that voltage detection module generates and generates first
Dynamic signal is to be connected circuit of reversed excitation module, so light modulating device can be made to work normally.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (9)
1. a kind of light modulating device, which is characterized in that the light modulating device includes control module, filter module, drive module, flyback
Circuit module, current detection module, voltage detection module and switch module;
The output end of the control module is connect with the input terminal of the filter module, the output end of the filter module with it is described
The first input end of switch module connects, the second input terminal of the output end of the drive module and the switch module and described
The input terminal of circuit of reversed excitation module connects, output end, the electric current of the input terminal of the drive module and the switch module
The output end of detection module and the connection of the output end of the voltage detection module, the first output end of the circuit of reversed excitation module
It is connect with the input terminal of the current detection module, third output end and the voltage detection module of the circuit of reversed excitation module
Input terminal connection, the second output terminal of the circuit of reversed excitation module and the load connection;
After the power is turned on, the filter module generates first voltage, the drive according to the pulse-width signal that the control module exports
Dynamic model block generates the first drive signal, and the circuit of reversed excitation module is connected according to first drive signal and exports electric current to be measured
And load voltage, the load voltage are powered load, the current detection module is generated according to the electric current to be measured
The first ramp voltage risen, when first ramp voltage is more than first threshold, the drive module is oblique according to described first
Wave voltage generates the second drive signal, and the circuit of reversed excitation module is ended according to second drive signal and stopped described in output
Load voltage, and the second ramp voltage declined is generated, the voltage inspection when second ramp voltage is less than second threshold
Survey module and generate conductivity control signal, the switch module ends according to second drive signal, the drive module according to
The conductivity control signal generates first drive signal so that the circuit of reversed excitation module and the switch module is connected.
2. light modulating device as described in claim 1, which is characterized in that when institute's circuit of reversed excitation module and the switch module are connected
When, the switch module generates second voltage, and the circuit of reversed excitation module exports the electric current to be measured and the load voltage, institute
It states current detection module and generates first ramp voltage risen according to the electric current to be measured, the second voltage and described the
One ramp voltage is superimposed to form tertiary voltage, and when the tertiary voltage is more than first threshold, the drive module is according to
Tertiary voltage generates second drive signal.
3. light modulating device as described in claim 1, which is characterized in that the control module adjusts the pulse-width signal
Duty ratio adjusts the first voltage, the second voltage and the tertiary voltage to control the circuit of reversed excitation module
Turn-on time.
4. light modulating device as described in claim 1, which is characterized in that the switch module includes the first field-effect tube, second
Field-effect tube, first resistor and 3rd resistor;
The source electrode of first field-effect tube is connect with the first end of the 3rd resistor, and the second end of the 3rd resistor is institute
The output end of switch module is stated, the drain electrode of first field-effect tube is connect with the drain electrode of second field-effect tube, and described
The source electrode of two field-effect tube be the switch module first input end, the grid of first field-effect tube with described second
The first end of the grid of effect pipe and the first resistor connects, and the second end of the first resistor is the switch module
Second input terminal.
5. light modulating device as claimed in claim 4, which is characterized in that the filter module includes second resistance and the first electricity
Hold;
The first end of the second resistance is the input terminal of the filter module, the second end of the second resistance and described first
The first end of capacitance is the output end of the filter module, and the second end of first capacitance is connect with power ground.
6. light modulating device as described in claim 1, which is characterized in that the drive module is power supply control chip;
The voltage and current test side of the power supply control chip is the input terminal of the drive module, the power supply control chip
Driving voltage output end be the drive module output end.
7. light modulating device as described in claim 1, which is characterized in that the circuit of reversed excitation module includes transformer and third field
Effect pipe;
The first end of the primary side winding of the transformer is connect with external power supply, the second end of the primary side winding of the transformer with
The source electrode of the third field-effect tube connects, and the grid of the third field-effect tube is the input terminal of the circuit of reversed excitation module,
The drain electrode of the third field-effect tube is the first output end of the circuit of reversed excitation module, the first vice-side winding of the transformer
First end be the circuit of reversed excitation module second output terminal, the first end of the second vice-side winding of the transformer is described
The third output end of circuit of reversed excitation module, the second end of the first vice-side winding of the transformer and the second pair of the transformer
The second end of side winding is connected to power ground altogether.
8. light modulating device as described in claim 1, which is characterized in that the current detection module includes the 4th resistance and the 5th
Resistance;
The first end of 4th resistance and the input terminal that the first end of the 5th resistance is the current detection module, it is described
The second end of 5th resistance is the output end of the current detection module, and the second end of the 4th resistance is connect with power ground.
9. a kind of light adjusting system, which is characterized in that the light adjusting system includes loading and as described in any one of claim 1 to 8
Light modulating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710228864.2A CN108696972B (en) | 2017-04-10 | 2017-04-10 | A kind of dimming device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710228864.2A CN108696972B (en) | 2017-04-10 | 2017-04-10 | A kind of dimming device and system |
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| Publication Number | Publication Date |
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| CN108696972A true CN108696972A (en) | 2018-10-23 |
| CN108696972B CN108696972B (en) | 2019-12-03 |
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