CN214101870U - Constant voltage dimming circuit - Google Patents
Constant voltage dimming circuit Download PDFInfo
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- CN214101870U CN214101870U CN202022716472.0U CN202022716472U CN214101870U CN 214101870 U CN214101870 U CN 214101870U CN 202022716472 U CN202022716472 U CN 202022716472U CN 214101870 U CN214101870 U CN 214101870U
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Abstract
The utility model discloses a constant voltage dimming circuit, including adjustable constant voltage output module and processing module, processing module includes the sense terminal, regulation end and output, processing module's sense terminal is connected in order to acquire the output voltage signal with adjustable constant voltage output module's output, processing module's regulation end can acquire external dimming control signal, processing module's output can be exported according to the feedback control signal who handles in order to reacing output voltage signal and the integration of dimming control signal, processing module's output and adjustable constant voltage output module's controlled end are connected the size of adjusting output voltage with the adjustable constant voltage output module of control, this design is adjusted luminance stably, can reduce the light source stroboscopic.
Description
Technical Field
The utility model relates to a lighting dimming technology field, in particular to constant voltage dimming circuit.
Background
Traditional constant voltage dimming circuit, generally by constant voltage output module, control chip and switch module constitute, through the modulation setting to constant voltage output module, output suitable voltage level, be the light source power supply through switch module, control chip again according to user's the demand output PWM duty cycle signal of adjusting luminance, control switch module adjusts the on-time, thereby adjust the output voltage for the light source power supply, in order to reach the purpose of adjusting luminance, but, dimming circuit structure in the past is difficult to solve at the relatively serious problem of low-voltage section light source stroboscopic.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a constant voltage dimming circuit, it is stable to adjust luminance.
According to the utility model discloses a constant voltage dimming circuit of first aspect embodiment, include: an adjustable constant voltage output module; processing module, including sense terminal, regulation end and output, processing module's sense terminal with adjustable constant voltage output module's output is connected in order to acquire the output voltage signal, processing module's regulation end can acquire external dimming control signal, processing module's output can be exported according to the feedback control signal who handles in order to reacing output voltage signal and dimming control signal integration, processing module's output with adjustable constant voltage output module's controlled end is connected with control adjustable constant voltage output module adjusts output voltage's size.
According to the utility model discloses constant voltage dimming circuit has following beneficial effect at least:
the utility model discloses constant voltage dimming circuit, can export the constant voltage of different grades through controlling adjustable constant voltage output module, insert the light source load and for its power supply operation at adjustable constant voltage output module, processing module's sense terminal is connected with adjustable constant voltage output module's output in order to learn the output voltage this moment, and processing module's regulation end can acquire the dimming control signal that user input set for, learn whether output voltage satisfies user's the requirement of adjusting luminance through handling, and then export relevant feedback control signal to adjustable constant voltage output module by processing module, the size of output constant voltage is adjusted in order to reach the purpose of adjusting luminance to control adjustable constant voltage output module, it is stable to adjust luminance, can reduce the light source stroboscopic.
According to the utility model discloses a some embodiments, processing module is comparison module, comparison module includes sense terminal, regulation end and output, comparison module's sense terminal with adjustable constant voltage output module's output is connected in order to acquire the output voltage signal, comparison module's regulation end can acquire external dimming control signal, comparison module's output can be exported according to the feedback control signal who compares in order to reacing output voltage signal and dimming control signal, comparison module's output with adjustable constant voltage output module's controlled end is connected in order to control adjustable constant voltage output module adjusts output voltage's size.
According to the utility model discloses a some embodiments, the comparison module includes optoelectronic coupler and signal voltage regulation unit, the signal voltage regulation unit can acquire external dimming control signal and form reference voltage according to dimming control signal, optoelectronic coupler includes illuminator and photic ware, the positive pole of illuminator with adjustable constant voltage output module's output is connected, the negative pole of illuminator with the output of signal voltage regulation unit is connected, the photic ware with adjustable constant voltage output module's controlled end is connected.
According to some embodiments of the present invention, the signal voltage regulating unit is an operational amplifier circuit.
According to some embodiments of the present invention, the signal voltage regulating unit includes an operational amplifier U2, a diode D1, a resistor R5, a resistor R6, a resistor R12, a resistor R34, a resistor R55, a resistor R13, an adjustable voltage regulator U5, and a capacitor C15, an anode of the diode D1 is connected to a cathode of the light emitter, an output terminal of the operational amplifier U2 is connected to a cathode of the diode D1 and one end of the capacitor C15, another end of the capacitor C15 is connected to one end of the resistor R6, another end of the resistor R6 is connected to a first input terminal of the operational amplifier U2, one end of the resistor R34, and one end of the resistor R55, a second input terminal of the operational amplifier U2 is connected to one end of the resistor R12 and one end of the resistor R13, another end of the resistor R13 is capable of acquiring an external dimming control signal, and another end of the resistor R12 is connected to one end of the resistor R5, The controlled pole of the adjustable voltage-stabilizing source U5 is connected with the cathode of the adjustable voltage-stabilizing source U5, the other end of the resistor R34 and the other end of the resistor R5 are both connected with an external power supply, and the other end of the resistor R55 and the anode of the adjustable voltage-stabilizing source U5 are both grounded.
According to the utility model discloses a some embodiments still include the overcurrent protection module, the overcurrent protection module with the output of adjustable constant voltage output module is connected in order to detect operating current, the overcurrent protection module with the controlled end of adjustable constant voltage output module is with control adjustable constant voltage output module adjusts output voltage's size.
According to some embodiments of the invention, the over-current protection module is connected to the cathode of the light emitter.
According to some embodiments of the present invention, the over-current protection module includes a comparator U6, a resistor R4, a resistor R8, a resistor R28, a resistor R46, a capacitor C1, a capacitor C2, a controllable regulator U4, and a diode D2, an anode of the diode D2 is connected to a cathode of the light emitter, a cathode of the diode D2 is connected to an output terminal of the comparator U6 and an end of the capacitor C2, respectively, another end of the capacitor C2 is connected to an end of the resistor R46, another end of the resistor R46 is connected to an end of the capacitor C1, a first input terminal of the comparator U6, and an output terminal of the adjustable constant voltage output module, a second input terminal of the comparator U6 is connected to an end of the resistor R8 and an end of the resistor R4, another end of the resistor R4 is connected to a controlled pole of the controllable regulator U4, an end of the controllable regulator U4, and an end of the resistor R28, the other end of the resistor R28 is connected with an external power supply, and the anode of the controllable voltage-stabilizing source U4, the other end of the capacitor C1 and the other end of the resistor R8 are all grounded.
According to the utility model discloses a some embodiments, adjustable constant voltage output module includes main control unit and constant voltage modulation unit, processing module's output with the main control unit is connected, the main control unit with the constant voltage modulation unit is connected with control the size that constant voltage modulation unit adjusted output voltage, processing module's sense terminal with the output of constant voltage modulation unit is connected.
According to some embodiments of the utility model, still include control module and energy supply module, energy supply module with control module connects with the power supply, through control module can form multiple dimming control signal, control module with processing module's regulation end is connected.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural block diagram of one embodiment of the constant voltage dimming circuit of the present invention;
fig. 2 is a schematic circuit diagram of an adjustable constant voltage output module and a filter module of the constant voltage dimming circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a processing module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of an energy supply module according to an embodiment of the present invention.
Reference numerals:
the constant voltage control circuit comprises an adjustable constant voltage output module 100, a main control unit 110, a constant voltage modulation unit 120, a processing module 200, a photoelectric coupler 210, a signal voltage regulation unit 220, an operation and control module 300, an energy supply module 400, a voltage stabilization module 500 and an overcurrent protection module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the orientation description, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., is the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplicity of description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1-4, according to the utility model discloses a constant voltage dimming circuit of first aspect embodiment, including adjustable constant voltage output module 100 and processing module 200, processing module 200 includes the sense terminal, adjust end and output, processing module 200's sense terminal is connected in order to acquire the output voltage signal with adjustable constant voltage output module 100's output, processing module 200's regulation end can acquire external dimming control signal, processing module 200's output can be exported according to the feedback control signal who handles in order to reach output voltage signal and the integration of dimming control signal, processing module 200's output and adjustable constant voltage output module 100's controlled end are connected in order to control adjustable constant voltage output module 100 and adjust the size of output voltage.
Wherein, in some embodiments of the present invention, the adjustable constant voltage output module 100 includes a main control unit 110 and a constant voltage modulation unit 120, the output end of the processing module 200 is connected to the main control unit 110, the main control unit 110 is connected to the constant voltage modulation unit 120 to control the magnitude of the output voltage adjusted by the constant voltage modulation unit 120, and the detection end of the processing module 200 is connected to the output end of the constant voltage modulation unit 120.
The main control unit 110 may be composed of a CPU, an MCU or other processing chip and its peripheral circuits, and the constant voltage modulation unit 120 may be selected from a conventional constant voltage modulation circuit or an integrated adjustable digital constant voltage source.
In some embodiments of the present invention, the energy supply module 400 is connected to the control module 300 to supply power, the control module 300 can form a plurality of dimming control signals, and the control module 300 is connected to the adjustment end of the processing module 200.
The control module 300 may be an encoder or a multi-step resistive knob, and the energy supply module 400 may be a constant voltage circuit as shown in fig. 4, which outputs a voltage, for example, 10V, to the control module 300, and a user may form different voltage levels as the dimming control signal through the control module 300 and output the dimming control signal to the processing module 200.
As shown in fig. 2, in some embodiments of the present invention, the output end of the adjustable constant voltage output module 100 may further be connected to components such as a voltage stabilizing module 500 and a common mode inductor LF4, and the output end is connected to the light source through the components such as the voltage stabilizing module 500 and the common mode inductor LF4 for power supply.
The utility model discloses constant voltage dimming circuit, can export the constant voltage of different grades through the adjustable constant voltage output module 100 of control, when adjustable constant voltage output module 100 inserts the light source load and for its power supply operation, processing module 200's sense terminal is connected with adjustable constant voltage output module 100's output in order to learn the output voltage this moment, and processing module 200's regulation end can acquire the dimming control signal that user input set for, whether output voltage satisfies user's requirement of adjusting luminance through handling, and then export relevant feedback control signal to adjustable constant voltage output module 100 by processing module 200, the size of the adjustable constant voltage output module 100 of control output constant voltage is in order to reach the purpose of adjusting luminance, adjust luminance stably, can reduce the light source stroboscopic.
In some embodiments of the utility model, processing module 200 is comparison module, comparison module includes the sense terminal, regulation end and output, comparison module's sense terminal is connected in order to acquire the output voltage signal with adjustable constant voltage output module 100's output, comparison module's regulation end can acquire external dimming control signal, comparison module's output can be exported according to the feedback control signal who compares in order to reacing output voltage signal and dimming control signal, comparison module's output is connected with adjustable constant voltage output module 100's controlled end and adjusts output voltage's size with control adjustable constant voltage output module 100.
In some embodiments of the present invention, the processing module 200 may also be a processing chip, and performs logic judgment on the dimming control signal and the output voltage signal.
In the embodiment that the processing module 200 is a comparing module, as shown in fig. 3, the adjusting terminal of the comparing module can obtain the dimming control signal, and the dimming control signal is used to know the voltage level that needs to be set by the user, and the detecting terminal of the comparing module obtains the output voltage signal, and when the output voltage signal is higher than the set voltage level, the adjustable constant voltage output module 100 is controlled to continuously decrease the output voltage.
The utility model discloses an in some embodiments, the comparison module includes optoelectronic coupler 210 and signal pressure regulating unit 220, signal pressure regulating unit 220 can acquire external dimming control signal and form the reference voltage of different grades according to dimming control signal, optoelectronic coupler 210 includes illuminator and photic ware, the positive pole of illuminator is connected with adjustable constant voltage output module 100's output, the negative pole of illuminator is connected with signal pressure regulating unit 220's output, the photic ware is connected with adjustable constant voltage output module 100's controlled end.
The utility model discloses an in some embodiments, the comparison module can also be constituted by the comparator, and dimming control signal and output voltage signal are inserted respectively to the first input and the second input of comparator, form output voltage signal output after comparing.
In some embodiments of the present invention, the signal voltage regulating unit 220 is an operational amplifier circuit, and the different dimming control signals form different levels of reference voltage through operational amplification of the dimming control signal.
Specifically, the signal voltage regulating unit 220 includes an operational amplifier U2, a diode D1, a resistor R5, a resistor R6, a resistor R12, a resistor R34, a resistor R55, a resistor R13, an adjustable regulator U5, and a capacitor C15, an anode of the diode D1 is connected to a cathode of the light emitter, an output terminal of the operational amplifier U2 is connected to a cathode of the diode D1 and one end of the capacitor C15, another end of the capacitor C15 is connected to one end of the resistor R6, another end of the resistor R6 is connected to a first input terminal of the operational amplifier U2, one end of the resistor R34, and one end of the resistor R55, a second input terminal of the operational amplifier U2 is connected to one end of the resistor R12 and one end of the resistor R13, another end of the resistor R13 is capable of obtaining an external dimming control signal, another end of the resistor R12 is connected to one end of the resistor R5, a controlled pole of the regulator U5, and a cathode of the adjustable regulator U5, the other end of the resistor R34 and the other end of the resistor R5 are both connected with an external power supply, and the other end of the resistor R55 and the anode of the adjustable voltage-stabilizing source U5 are both grounded.
Further, the other end of the resistor R13 is connected to the control module 300 after being divided by the resistors R14 and R15, for example, the control module 300 may input a voltage of 0-10V as a dimming control signal at one end of the resistor R14, and after being amplified by the operational amplifier U2, the dimming control signal forms a voltage level corresponding to the dimming control signal and is provided to the photocoupler 210 as a reference voltage for comparison.
The utility model discloses an in some embodiments, still include overcurrent protection module 600, overcurrent protection module 600 is connected with adjustable constant voltage output module 100's output in order to detect operating current, and overcurrent protection module 600 and adjustable constant voltage output module 100's controlled end are with the size that control adjustable constant voltage output module 100 adjusted output voltage.
The overcurrent protection module 600 can be connected to the output end of the adjustable constant voltage output module 100 and a power supply loop of the light source through the resistor R33, and when the detected current is too large, a signal can be fed back to the adjustable constant voltage output module 100 to adjust the output voltage down, so that the current is reduced.
In some embodiments of the present invention, the over-current protection module 600 can be connected to the cathode of the light emitter, and when the current is too large, the voltage of the cathode of the light emitter can be pulled down, so that the light emitter is turned on and lighted, and the signal is fed back to the adjustable constant voltage output module 100.
In some embodiments of the present invention, the overcurrent protection module 600 can also be directly connected to the adjustable constant voltage output module 100 to directly feed back the signal to the adjustable constant voltage output module 100.
Specifically, as shown in fig. 3, the overcurrent protection module 600 includes a comparator U6, a resistor R4, a resistor R8, a resistor R28, a resistor R46, a capacitor C1, a capacitor C2, a controllable regulator U4, and a diode D2, an anode of the diode D2 is connected to a cathode of the light emitter, a cathode of the diode D2 is connected to an output terminal of the comparator U6 and one end of the capacitor C2, another end of the capacitor C2 is connected to one end of the resistor R46, another end of the resistor R46 is connected to one end of the capacitor C1, a first input terminal of the comparator U6, and an output terminal of the adjustable constant voltage output module 100, a second input terminal of the comparator U6 is connected to one end of the resistor R8 and one end of the resistor R4, another end of the resistor R4 is connected to a controlled electrode of the controllable regulator U4, a cathode of the controllable regulator U4, and one end of the resistor R28, another end of the resistor R28 is connected to an external power supply (the adjustable constant voltage output module 100), the anode of the controllable voltage regulator source U4, the other end of the capacitor C1 and the other end of the resistor R8 are all grounded.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A constant voltage dimming circuit, comprising:
an adjustable constant voltage output module;
processing module, including sense terminal, regulation end and output, processing module's sense terminal with adjustable constant voltage output module's output is connected in order to acquire the output voltage signal, processing module's regulation end can acquire external dimming control signal, processing module's output can be exported according to the feedback control signal who handles in order to reacing output voltage signal and dimming control signal integration, processing module's output with adjustable constant voltage output module's controlled end is connected with control adjustable constant voltage output module adjusts output voltage's size.
2. The constant-voltage dimming circuit according to claim 1, wherein: the processing module is comparison module, comparison module includes sense terminal, regulation end and output, comparison module's sense terminal with adjustable constant voltage output module's output is connected in order to acquire the output voltage signal, comparison module's regulation end can acquire external dimming control signal, comparison module's output can be exported according to the feedback control signal who compares in order to reacing output voltage signal and dimming control signal, comparison module's output with adjustable constant voltage output module's controlled end is connected in order to control adjustable constant voltage output module adjusts output voltage's size.
3. The constant-voltage dimming circuit according to claim 2, wherein: the comparison module includes optoelectronic coupler and signal voltage regulation unit, the signal voltage regulation unit can acquire external dimming control signal and form reference voltage according to dimming control signal, optoelectronic coupler includes illuminator and photic ware, the positive pole of illuminator with adjustable constant voltage output module's output is connected, the negative pole of illuminator with the output of signal voltage regulation unit is connected, photic ware with adjustable constant voltage output module's controlled end is connected.
4. The constant-voltage dimming circuit according to claim 3, wherein: the signal voltage regulating unit is an operational amplifying circuit.
5. The constant-voltage dimming circuit according to claim 4, wherein: the signal voltage regulating unit comprises an operational amplifier U2, a diode D1, a resistor R5, a resistor R6, a resistor R12, a resistor R34, a resistor R55, a resistor R13, an adjustable voltage-stabilizing source U5 and a capacitor C15, wherein the anode of the diode D1 is connected with the cathode of the light emitter, the output end of the operational amplifier U2 is respectively connected with the cathode of the diode D1 and one end of the capacitor C15, the other end of the capacitor C15 is connected with one end of the resistor R6, the other end of the resistor R6 is respectively connected with the first input end of the operational amplifier U2, one end of a resistor R34 and one end of a resistor R55, the second input end of the operational amplifier U2 is respectively connected with one end of the resistor R12 and one end of the resistor R13, the other end of the resistor R13 is capable of acquiring an external dimming control signal, the other end of the resistor R12 is respectively connected with one end of the resistor R5, one end of the adjustable voltage-stabilizing source U5 and the cathode 5, the other end of the resistor R34 and the other end of the resistor R5 are both connected with an external power supply, and the other end of the resistor R55 and the anode of the adjustable voltage-stabilizing source U5 are both grounded.
6. The constant-voltage dimming circuit according to claim 3, wherein: the overcurrent protection module is connected with the output end of the adjustable constant voltage output module to detect working current, and the controlled end of the overcurrent protection module and the controlled end of the adjustable constant voltage output module are used for controlling the adjustable constant voltage output module to adjust the output voltage.
7. The constant-voltage dimming circuit according to claim 6, wherein: the overcurrent protection module is connected with the cathode of the light emitter.
8. The constant-voltage dimming circuit according to claim 7, wherein: the over-current protection module comprises a comparator U6, a resistor R4, a resistor R8, a resistor R28, a resistor R46, a capacitor C1, a capacitor C2, a controllable voltage-stabilizing source U4 and a diode D2, wherein the anode of the diode D2 is connected with the cathode of the light emitter, the cathode of the diode D2 is respectively connected with the output end of the comparator U6 and one end of the capacitor C2, the other end of the capacitor C2 is connected with one end of the resistor R46, the other end of the resistor R46 is respectively connected with one end of the capacitor C1, the first input end of the comparator U6 and the output end of the adjustable constant voltage output module, the second input end of the comparator U6 is respectively connected with one end of the resistor R8 and one end of the resistor R4, the other end of the resistor R4 is respectively connected with the controlled pole of the controllable voltage-stabilizing source U4, the cathode of the controllable voltage-stabilizing source U4 and one end of the resistor R28, the other end of the resistor R28 is connected with an external power supply, and the anode of the controllable voltage-stabilizing source U4, the other end of the capacitor C1 and the other end of the resistor R8 are all grounded.
9. The constant-voltage dimming circuit according to claim 1, wherein: the adjustable constant voltage output module comprises a main control unit and a constant voltage modulation unit, the output end of the processing module is connected with the main control unit, the main control unit is connected with the constant voltage modulation unit to control the constant voltage modulation unit to adjust the output voltage, and the detection end of the processing module is connected with the output end of the constant voltage modulation unit.
10. The constant-voltage dimming circuit according to claim 1, wherein: still including controlling module and energy supply module, energy supply module with control the module connection with the power supply, through control the module and can form multiple dimming control signal, control the module with processing module's regulation end is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022716472.0U CN214101870U (en) | 2020-11-20 | 2020-11-20 | Constant voltage dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022716472.0U CN214101870U (en) | 2020-11-20 | 2020-11-20 | Constant voltage dimming circuit |
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| Publication Number | Publication Date |
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| CN214101870U true CN214101870U (en) | 2021-08-31 |
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| CN202022716472.0U Active CN214101870U (en) | 2020-11-20 | 2020-11-20 | Constant voltage dimming circuit |
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| CN (1) | CN214101870U (en) |
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