CN216531860U - PWM (pulse-width modulation) dimming receiving circuit - Google Patents
PWM (pulse-width modulation) dimming receiving circuit Download PDFInfo
- Publication number
- CN216531860U CN216531860U CN202122941219.XU CN202122941219U CN216531860U CN 216531860 U CN216531860 U CN 216531860U CN 202122941219 U CN202122941219 U CN 202122941219U CN 216531860 U CN216531860 U CN 216531860U
- Authority
- CN
- China
- Prior art keywords
- triode
- electrically connected
- pwm
- resistor
- pwm signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a PWM dimming receiving circuit which is electrically connected with a control input end of a PWM dimmer; the constant current module comprises a resistor R2, a triode Q1, a triode Q2 and a voltage-withstanding resistor group, one end of the resistor R2 is electrically connected with the output end of the PWM signal generation module, the other end of the resistor R2 is electrically connected with a base B of the triode Q1 and an emitter E of the triode Q2 respectively, the emitter E of the triode Q1 is electrically connected with the output end of the PWM signal generation module, a collector C of the triode Q1 is electrically connected with a base B of the triode Q2, and a collector C of the triode Q1 is grounded through the voltage-withstanding resistor group; the dimming output module comprises an optical coupler, the positive electrode of the transmitting end UIA of the optical coupler is electrically connected with the collector electrode C of the triode Q2, the negative electrode of the transmitting end UIA of the optical coupler is grounded, and the receiving end UIB of the optical coupler is electrically connected with the PWM dimmer. The utility model solves the problem that the existing PWM light modulator can not be connected with a plurality of power supplies at the same time.
Description
Technical Field
The utility model relates to the technical field of lamp dimming, in particular to a PWM dimming receiving circuit.
Background
PWM control is a pulse width modulation technique that equivalently obtains a desired waveform by modulating the width of a series of pulses. The PWM dimming is a mainstream technology of lamp dimming, the technology is widely applied, but the PWM signal has the defects of weak energy and low withstand voltage, the existing PWM dimmers have certain output current limitation, and if the current consumption of the PWM signal is excessive before the PWM signal is input into the PWM dimmer, one PWM dimmer cannot be simultaneously connected with a plurality of power supplies.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks, an object of the present invention is to provide a PWM dimming receiving circuit, which solves the problem that the existing PWM dimmer cannot connect multiple power supplies at the same time.
In order to achieve the purpose, the utility model adopts the following technical scheme: a PWM dimming receiving circuit is electrically connected with a control input end of a PWM dimmer, comprises a PWM signal generating module, a dimming output module and a constant current module, wherein the output end of the PWM signal generating module is electrically connected with the dimming output module through the constant current module;
the constant current module comprises a resistor R2, a triode Q1, a triode Q2 and a voltage-resistant resistor group, one end of the resistor R2 is electrically connected with the output end of the PWM signal generation module, the other end of the resistor R2 is respectively electrically connected with a base B of the triode Q1 and an emitter E of the triode Q2, the emitter E of the triode Q1 is electrically connected with the output end of the PWM signal generation module, a collector C of the triode Q1 is electrically connected with a base B of the triode Q2, and a collector C of the triode Q1 is also grounded through the voltage-resistant resistor group;
the dimming output module comprises an optical coupler, the anode of the emission end UIA of the optical coupler is electrically connected with the collector C of the triode Q2, the cathode of the emission end UIA of the optical coupler is grounded, and the receiving end UIB of the optical coupler is electrically connected with the PWM dimmer.
It should be noted that the PWM signal generator further includes a rectifier bridge BD1, the positive terminal B1 of the rectifier bridge BD1 is electrically connected to the positive terminal of the output terminal of the PWM signal generation module, the negative terminal B4 of the rectifier bridge BD1 is electrically connected to the negative terminal of the output terminal of the PWM signal generation module, one ac terminal B2 of the rectifier bridge BD1 is electrically connected to one end of the resistor R2, and the other ac terminal B3 of the rectifier bridge BD1 is grounded.
Optionally, the PWM signal generating module further comprises a resistor R1, one end of the resistor R1 is electrically connected to the positive electrode of the output end of the PWM signal generating module, and the other end of the resistor R1 is electrically connected to the positive electrode pin B1 of the rectifier bridge.
Specifically, the dimming output module further comprises a clamping regulator DZ1, a cathode of the clamping regulator DZ1 is electrically connected with a collector C of the triode Q2, and an anode of the clamping regulator DZ1 is grounded.
Preferably, the voltage-resistant resistor group comprises a plurality of resistors R3, and all the resistors R3 are connected in series.
It should be noted that the transistor Q1 is a PNP transistor.
Optionally, the transistor Q2 is a PNP transistor.
One of the above technical solutions has the following beneficial effects: in the PWM dimming receiving circuit, the PWM signal generated by the PWM signal generating module fixes the current of the PWM signal through the constant current module, and the current output by the constant current regulating module is I ═ VBEthe/R2 can adjust the current output by the constant current adjusting module by adjusting the resistance value of the resistor R2 of the constant current module, and because the conduction current of the optical coupler is very small, 1mA can be conducted enough, the current output by the constant current adjusting module is reduced by selecting the resistor R2 with a large resistance value, the current consumed by the PWM dimming receiving circuit can be effectively reduced, and the number of the power supplies which can be connected with the PWM dimmer can be increased.
Drawings
FIG. 1 is a circuit diagram of one embodiment of the present invention;
wherein: 1 constant current module.
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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A PWM dimming receiving circuit according to an embodiment of the present invention is described below with reference to fig. 1, and is electrically connected to a control input terminal of a PWM dimmer, and includes a PWM signal generating module and a dimming output module, where the PWM signal generating module is configured to generate a PWM signal, and the PWM signal includes PWM + and PWM-; the output end of the PWM signal generation module is electrically connected with the dimming output module through the constant current module 1; the constant current module 1 comprises a resistor R2, a triode Q1, a triode Q2 and a voltage-resistant resistor group, wherein one end of the resistor R2 is electrically connected with the output end of the PWM signal generation module, the other end of the resistor R2 is respectively electrically connected with a base B of the triode Q1 and an emitter E of the triode Q2, the emitter E of the triode Q1 is electrically connected with the output end of the PWM signal generation module, a collector C of the triode Q1 is electrically connected with a base B of the triode Q2, and a collector C of the triode Q1 is also grounded through the voltage-resistant resistor group; the dimming output module comprises an optical coupler, the anode of the emission end UIA of the optical coupler is electrically connected with the collector C of the triode Q2, the cathode of the emission end UIA of the optical coupler is grounded, and the receiving end UIB of the optical coupler is electrically connected with the PWM dimmer. Specifically, the constant current module 1 is used to ensure that the current output to the optocoupler is kept constant and does not change due to the current change of the PWM signal generated by the PWM signal generation module.
When the dimming lamp is used, the PWM dimming receiving circuit generates a processed low-current adjusting signal at the receiving end UIB of the optocoupler, and inputs the processed low-current adjusting signal to the control input end of the PWM dimmer, and in addition, a power supply is connected to the power supply input end of the PWM dimmer, and then a lamp to be dimmed is connected to the output point of the PWM dimmer, so that the illuminance of the lamp can be adjusted by adjusting the low-current adjusting signal. In the PWM dimming receiving circuit, the PWM signal generated by the PWM signal generating module fixes the current of the PWM signal through the constant current module 1, and the current output by the constant current regulating module is I ═ VBE/R2, wherein VBEIs the voltage between the base electrode B and the emitter electrode E of the triode Q1, R2 is the resistance value of the resistor R2, and I is the constant current regulating modeThe current output by the block can be adjusted by adjusting the resistance value of the resistor R2 of the constant current module 1, and the conduction current of the optical coupler is very small, so that 1mA is enough conducted, and the current output by the constant current adjusting module is reduced by selecting the resistor R2 with a large resistance value, so that the current consumed by the PWM dimming receiving circuit can be effectively reduced, and the number of power supplies which can be connected with the PWM dimmer can be increased.
In some embodiments, the PWM signal generating module further comprises a rectifier bridge BD1, wherein the positive terminal B1 of the rectifier bridge BD1 is electrically connected to the positive terminal of the output terminal of the PWM signal generating module, the negative terminal B4 of the rectifier bridge BD1 is electrically connected to the negative terminal of the output terminal of the PWM signal generating module, one ac terminal B2 of the rectifier bridge BD1 is electrically connected to one end of the resistor R2, and the other ac terminal B3 of the rectifier bridge BD1 is grounded. The rectification module can enable PWM signals generated by the PWM signal generation module to be in stepless access, so that the convenience in assembling the PWM signal generation module is improved.
It should be noted that the PWM signal generator further includes a resistor R1, one end of the resistor R1 is electrically connected to the positive electrode of the output end of the PWM signal generating module, and the other end of the resistor R1 is electrically connected to the positive electrode pin B1 of the rectifier bridge. The resistor R1 plays a role of current limiting safety, and the resistor R1 is used for limiting the maximum current input to the PWM dimming receiving circuit from the positive pole of the output end of the PWM signal generation module, so that the diode in the rectifier bridge BD1 is prevented from being broken down.
Optionally, the dimming output module further includes a clamping regulator DZ1, a cathode of the clamping regulator DZ1 is electrically connected to the collector C of the transistor Q2, and an anode of the clamping regulator DZ1 is grounded. The clamping regulator tube DZ1 is used for clamping the voltage of the optical coupler, thereby avoiding the damage of the optical coupler caused by the overhigh voltage applied to the optical coupler.
Specifically, the voltage-resistant resistor group comprises a plurality of resistors R3, and all resistors R3 are connected in series. The resistors R3 are connected in series, so that the total resistance of the voltage-resistant resistor group can be finely adjusted, and the current output by the constant current adjusting module can be finely adjusted.
Preferably, the transistor Q1 is a PNP transistor. The voltage V between the collector C and the emitter E of the triode Q1CEAnd the withstand voltage value of the rectifier bridge BD1 determines the withstand voltage of the PWM dimming receiving circuit, and the withstand voltage value of the PWM dimming receiving circuit can be improved by selecting the triode Q1 and the rectifier bridge BD1 with high withstand voltage.
In some embodiments, the transistor Q2 is a PNP transistor. The PNP triode is a triode formed by clamping an N-type semiconductor between two P-type semiconductors, and the current of the PNP triode flows into the PNP triode from an emitter E.
Other configurations and operations of a PWM dimming receiving circuit according to an embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the utility model 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 utility model, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The utility model provides a PWM adjusts luminance receiving circuit, is connected with the control input electricity of PWM dimmer, includes PWM signal generation module and adjusts luminance output module, its characterized in that: the output end of the PWM signal generation module is electrically connected with the dimming output module through the constant current module;
the constant current module comprises a resistor R2, a triode Q1, a triode Q2 and a voltage-resistant resistor group, one end of the resistor R2 is electrically connected with the output end of the PWM signal generation module, the other end of the resistor R2 is respectively electrically connected with a base B of the triode Q1 and an emitter E of the triode Q2, the emitter E of the triode Q1 is electrically connected with the output end of the PWM signal generation module, a collector C of the triode Q1 is electrically connected with a base B of the triode Q2, and a collector C of the triode Q1 is also grounded through the voltage-resistant resistor group;
the dimming output module comprises an optical coupler, the anode of the emission end UIA of the optical coupler is electrically connected with the collector C of the triode Q2, the cathode of the emission end UIA of the optical coupler is grounded, and the receiving end UIB of the optical coupler is electrically connected with the PWM dimmer.
2. The PWM dimming receiving circuit according to claim 1, wherein: the PWM signal generating circuit further comprises a rectifier bridge BD1, a positive electrode pin B1 of the rectifier bridge BD1 is electrically connected with a positive electrode of an output end of the PWM signal generating module, a negative electrode pin B4 of the rectifier bridge BD1 is electrically connected with a negative electrode of the output end of the PWM signal generating module, an alternating current pin B2 of the rectifier bridge BD1 is electrically connected with one end of the resistor R2, and the other alternating current pin B3 of the rectifier bridge BD1 is grounded.
3. The PWM dimming receiving circuit according to claim 2, wherein: the PWM signal generating circuit further comprises a resistor R1, one end of the resistor R1 is electrically connected with the positive electrode of the output end of the PWM signal generating module, and the other end of the resistor R1 is electrically connected with the positive electrode pin B1 of the rectifier bridge.
4. The PWM dimming receiving circuit according to claim 1, wherein: the dimming output module further comprises a clamping voltage regulator tube DZ1, the cathode of the clamping voltage regulator tube DZ1 is electrically connected with the collector C of the triode Q2, and the anode of the clamping voltage regulator tube DZ1 is grounded.
5. The PWM dimming receiving circuit according to claim 1, wherein: the voltage-resistant resistor group comprises a plurality of resistors R3, and all the resistors R3 are connected in series.
6. The PWM dimming receiving circuit according to claim 1, wherein: the triode Q1 is a PNP triode.
7. The PWM dimming receiving circuit according to claim 1, wherein: the triode Q2 is a PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122941219.XU CN216531860U (en) | 2021-11-25 | 2021-11-25 | PWM (pulse-width modulation) dimming receiving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122941219.XU CN216531860U (en) | 2021-11-25 | 2021-11-25 | PWM (pulse-width modulation) dimming receiving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216531860U true CN216531860U (en) | 2022-05-13 |
Family
ID=81463552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122941219.XU Active CN216531860U (en) | 2021-11-25 | 2021-11-25 | PWM (pulse-width modulation) dimming receiving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216531860U (en) |
-
2021
- 2021-11-25 CN CN202122941219.XU patent/CN216531860U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101605413B (en) | LED drive circuit suitable for controlled silicon light adjustment | |
| TWI404452B (en) | Current supply circuit and current control circuit for led | |
| CN101916548B (en) | Control circuit of light-emitting diode (LED) lamp tube of liquid crystal display | |
| CN101977469B (en) | Adjustable LED drive power supply | |
| US10517151B1 (en) | Linear constant-current LED light circuit | |
| CN201854486U (en) | Constant-current LED (light-emitting diode) driving power supply | |
| CN101795519A (en) | Dimming control circuit suitable for front-edge and/or rear-edge dimmer of light emitting diode (LED) | |
| CN201467538U (en) | LED driving circuit for controlled silicon dimming | |
| CN216531860U (en) | PWM (pulse-width modulation) dimming receiving circuit | |
| CN203120217U (en) | LED control circuit and LED lighting device | |
| CN112738951B (en) | LED control method and circuit | |
| CN214315691U (en) | Dimming conversion circuit, dimming circuit and lighting equipment | |
| CN211959621U (en) | LED lamp with dimming function | |
| CN113993244A (en) | Dimming circuit and light emitting device | |
| CN207070412U (en) | Constant current driving device and light fixture | |
| CN103200744B (en) | Silicon controlled rectifier dimming circuit, dimming method and light emitting diode (LED) driver applied silicon controlled rectifier dimming circuit | |
| CN201758474U (en) | LED light tube controlling circuit of LCD (liquid crystal display) | |
| CN114423118B (en) | Three-in-one dimming circuit and LED (light emitting diode) lighting system | |
| CN211859956U (en) | Half-bridge LLC constant power circuit of adjusting luminance | |
| CN217428401U (en) | Adjustable light linear circuit capable of adjusting constant output current | |
| CN210986527U (en) | Linear constant-current L ED lamp circuit | |
| CN213462413U (en) | Dimming LED lamp circuit | |
| CN217563813U (en) | 0-10V light-adjusting color-temperature-adjusting non-stroboscopic power supply | |
| CN218920650U (en) | Single live wire light modulator circuit | |
| CN112105124B (en) | Loop type low-power-consumption constant-current control circuit and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |