CN220653567U - Deep dimming circuit - Google Patents
Deep dimming circuit Download PDFInfo
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- CN220653567U CN220653567U CN202322189133.5U CN202322189133U CN220653567U CN 220653567 U CN220653567 U CN 220653567U CN 202322189133 U CN202322189133 U CN 202322189133U CN 220653567 U CN220653567 U CN 220653567U
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Abstract
The utility model discloses a deep dimming circuit which comprises an AC/DC input module, an LED constant current driving module, a deep dimming circuit module, an LED module and a PWM signal input module electrically connected with the deep dimming circuit module, wherein the AC/DC input module, the LED constant current driving module, the deep dimming circuit module and the PWM signal input module are sequentially and electrically connected, the deep dimming circuit module comprises a shunt regulating circuit, the shunt regulating circuit is connected with the LED module in parallel, a further dimming function is provided by shunting LED constant current driving output through a load, and the current of the shunt regulating circuit is controlled by a PWM signal through a clamping circuit, so that the high-precision and high-depth dimming effect is realized with lower cost on the premise of changing an LED driving main control chip, the popularization of LED intelligent lighting application and the upgrading of the dimming effect are realized, and a good promoting effect is realized.
Description
Technical Field
The utility model relates to the field of LED intelligent illumination, in particular to a deep dimming circuit.
Background
Along with the development and the application of intelligent illumination, users need the dimming performance of the LED products with a deeper range to cope with the use requirements of different scenes, most of the LED products existing in the market at present are limited by the precision and the cost of control chips, the minimum dimming brightness is 1%, and the requirements of subdivision are presented to the users, so that the LED products are difficult to realize.
In the prior art, the application number is CN201420351137.7, and the patent with the publication date of 2014, 11 and 12 discloses an LED dimming circuit, which comprises a sampling resistor, a comparator, an optocoupler unit, an RC negative feedback control loop and a PWM control unit; the PWM control unit comprises a PWM control chip, a transformer and peripheral elements; the output end of the transformer of the PWM control unit is connected with the LED; the sampling resistor is connected between the LED and the ground; the positive phase input end of the comparator is connected between the sampling resistor and the LED, the negative phase input end of the comparator is connected to an ADJ pin of the television main chip, the output end of the comparator is connected to the input end of the optocoupler unit, the input end of the optocoupler unit is also connected to the negative phase input end of the comparator through the RC negative feedback control loop, and the output end of the optocoupler unit is connected with the feedback pin of the PWM control chip of the PWM control unit.
The utility model patent with the application number of CN201410259076.6 and the publication date of 2014, 6 and 12 discloses a PWM dimming circuit for an LED lamp, which comprises an LED load, a constant current control circuit and a PWM signal generator; the PWM signal generator is connected with the constant current control circuit; the constant current control circuit comprises a switching device which is connected with one end of the LED load and used for controlling the current of the LED load; when the PWM signal generator sends out a high level signal, the switching device is turned on, and the constant current control circuit further includes: the feedback circuit is connected between the base electrode and the emitter electrode of the switching device, feeds back the voltage drop of the switching device to the switching device, keeps the current of the switching device constant, and keeps the current of the LED load constant.
Disclosure of Invention
The utility model provides a deep dimming circuit to solve the problems, which not only can realize dimming control below ten thousandth, but also can realize fine control on the color temperature of an LED in a multi-module parallel connection mode, can well solve the higher requirements of a user on dimming and color mixing of an LED product, has a simple structure, has the advantages of strong applicability, low cost and the like, and has good promotion effects on popularization of intelligent LED lighting application and upgrading of dimming effect.
The utility model provides a degree of depth dimming circuit, its characterized in that, including AC/DC input module, LED constant current drive module, degree of depth dimming circuit module, LED module and with the PWM signal input module that degree of depth dimming circuit module electricity is connected, degree of depth dimming circuit module includes the reposition of redundant personnel governing circuit, reposition of redundant personnel governing circuit with the LED module is parallelly connected, PWM signal input module passes through clamping circuit and is connected with reposition of redundant personnel governing circuit control end electricity.
Preferably, the output end of the AC/DC input module is electrically connected with the input end of the LED constant current driving module, the output end of the LED constant current driving module is electrically connected with the input end of the deep dimming circuit module, and the output end of the deep dimming circuit module is electrically connected with the input end of the LED module.
Preferably, the shunt regulating circuit comprises a load resistor R3, one end of the load resistor R3 is electrically connected with the anode of the LED constant current driving module, the other end of the load resistor R3 is electrically connected with the first non-control end of the switching device Q1, the second non-control end of the switching device Q1 is electrically connected with the cathode of the LED constant current driving module, and the control end is electrically connected with the clamping circuit.
Preferably, the clamping circuit comprises a start pull-up resistor R1, one end of the start pull-up resistor R1 is electrically connected with the anode of the LED constant current driving module, the other end of the start pull-up resistor R1 is electrically connected with the control end of the switching device Q1 and one end of a pull-down bleeder resistor R2 respectively, the other end of the pull-down bleeder resistor R2 is electrically connected with the first non-control end of the switching device Q2, the control end of the switching device Q2 is electrically connected with the PWM signal input module, and the second non-control end of the switching device Q2 is grounded.
Preferably, a zener diode ZD1 is electrically connected between the control terminal and the second non-control terminal of the switching device Q1.
Preferably, the types of the switching device Q1 and the switching device Q2 include, but are not limited to, MOSFETs, triodes, thyristors, relays.
Preferably, the deep dimming circuit module may be electrically connected with one or more of the AC/DC input module, the LED constant current driving module, the LED module, and the PWM signal input module.
Compared with the prior art, the utility model has the beneficial effects that:
the light-adjusting effect and the light-adjusting precision in a wider range can be realized without being influenced by the precision and the performance of the chip, and the accurate control of the brightness of the LED product below one ten thousandth is realized.
The minimum output current of the circuit can be controlled by selecting the load resistors R3 with different resistance values, so that the dimming depth of the dimming circuit is changed.
The circuit has the advantages of simple structure, strong applicability, low cost and the like, and has good promotion effect on popularization of LED intelligent lighting application.
Drawings
FIG. 1 is a schematic circuit diagram of a first embodiment of the present utility model;
fig. 2 is a circuit schematic of a second embodiment of the present utility model.
Detailed Description
The following describes a specific embodiment of the technical scheme of the present utility model by way of examples and with reference to the accompanying drawings.
Embodiment one:
referring to fig. 1, a circuit schematic diagram of a first embodiment of the present utility model is shown, and a basic circuit block diagram in the present embodiment includes an AC/DC input module, an LED constant current driving module, a deep dimming module, an LED module, and a PWM signal input module. The AC/DC input module output end is electrically connected with the LED constant current driving module input end, the LED constant current driving module output end is electrically connected with the deep dimming circuit module input end, and the deep dimming circuit module output end is electrically connected with the LED module input end. The circuit main body of the embodiment is a deep dimming circuit module; in addition, one or more of an AC/DC input module, an LED constant current driving module, an LED module, and a PWM signal input module part may be included.
And in the deep dimming circuit module, the deep dimming circuit module comprises a shunt regulating circuit, wherein the shunt regulating circuit comprises a load resistor R3, one end of the load resistor R3 is electrically connected with the anode of the LED constant current driving module, and the other end of the load resistor R3 is electrically connected with the first non-control end of the switching device Q1.
The shunt regulating circuit is connected with the LED module in parallel and is used for shunting the current output by the LED constant current driving module. Wherein the switching device Q1 is of a type including, but not limited to, MOSFET, triode (BJT), thyristor, relay, etc.
The second non-control end of the switching device Q1 is grounded together with the LED constant current driving module, so that the safety of the module is improved. Whether the LED constant current driving module is grounded or not is related to the design of the LED constant current driving module, and the LED constant current driving module used in the embodiment is commonly grounded with the deep dimming circuit module.
In this embodiment, the control end of the switching device Q1 is directly electrically connected to the output end of the PWM signal input module, and the on time of the switching device Q1 is controlled by changing the duty ratio of the input PWM signal, so as to adjust the current of the shunt regulator circuit. Because the output current of the LED constant current driving module is constant, and the current value is equal to the sum of the current flowing through the shunt regulating circuit and the current of the LED module, the current of the LED module can be controlled by controlling the current flowing through the shunt regulating circuit, and the dimming function is further realized.
When the signal output by the PWM signal input module is at a high level, the switching device Q1 is turned on, the current flowing through the load resistor R3 is large, the current obtained by the LED module is small, the lamp is dark, and the dimming is deep; on the contrary, when the signal output by the PWM signal input module is at a low level, the switching device Q1 is turned off, the current flowing through the load resistor R3 is 0, the current of the LED constant current driving module completely flows into the LED module, and the lamp is brighter; in summary, by changing the duty ratio of the PWM signal input module in a certain period, the on time of the switching device Q1 is changed, so that the current flowing through the LED module can be changed in a certain range, and the dimming function is realized.
The deep dimming circuit provided in the embodiment has the advantages of simple structure, low cost and good dimming effect. The minimum output current of the circuit depends on the magnitude of the current flowing through the shunt regulating circuit, namely, the smaller the resistance value of the load resistor R3 is, the larger the current flowing through the LED module is, the smaller the current flowing through the LED module is, and the deeper the dimming depth is; the circuit is not limited by the performance and control precision of the control chip in the LED constant current driving module, and can realize the dimming effect and the dimming precision in a wider range.
Embodiment two:
referring to fig. 2, a circuit diagram of a second embodiment of the present utility model is shown, and a basic circuit diagram in the present embodiment includes an AC/DC input module, an LED constant current driving module, a deep dimming module, an LED module, and a PWM signal input module. The AC/DC input module output end is electrically connected with the LED constant current driving module input end, the LED constant current driving module output end is electrically connected with the deep dimming circuit module input end, and the deep dimming circuit module output end is electrically connected with the LED module input end. The circuit main body of the embodiment is a deep dimming circuit module; in addition, one or more of an AC/DC input module, an LED constant current driving module, an LED module, and a PWM signal input module part may be included.
And in the deep dimming circuit module, the deep dimming circuit module comprises a shunt regulating circuit, the shunt regulating circuit comprises a load resistor R3, one end of the load resistor R3 is electrically connected with the anode of the LED constant current driving module, the other end of the load resistor R3 is electrically connected with the first non-control end of the switching device Q1, and the second non-control end of the switching device Q1 is electrically connected with the cathode of the LED constant current driving module.
The shunt regulating circuit is connected with the LED module in parallel and is used for shunting the current output by the LED constant current driving module. Wherein the switching device Q1 is of a type including, but not limited to, MOSFET, triode (BJT), thyristor, relay, etc.
The scenario applied in the embodiment is in the scenario that the LED constant current driving module and the deep dimming circuit module are not commonly grounded.
In this embodiment, the switching device Q1 is electrically connected to the PWM signal input module through a clamping circuit, where the clamping circuit includes a pull-up resistor R1, a pull-down bleeder resistor R2, and a switching device Q2.
One end of a starting pull-up resistor R1 is electrically connected with the anode of the LED constant current driving module, the other end of the starting pull-up resistor R1 is electrically connected with the control end of the switching device Q1, and the starting pull-up resistor R1 is used for providing a high-level input signal for the switching device Q1.
One end of the pull-down bleeder resistor R2 is electrically connected with the control end of the switching device Q1, the other end of the pull-down bleeder resistor R2 is electrically connected with the first non-control end of the switching device Q2, and the second non-control end of the switching device Q2 is grounded. The pull-down bleeder resistor R2 is used to provide a low level input signal to the switching device Q1 when the switching device Q2 is on.
The control end of the switching device Q2 is electrically connected with the PWM signal input module, and the on time of the switching device Q1 can be indirectly controlled by changing the on time of the switching device Q2. Wherein the switching device Q2 is of a type including, but not limited to, MOSFET, triode (BJT), thyristor, relay, etc.
And a zener diode ZD1 is electrically connected between the control end of the switching device Q1 and the second non-control end and is used for maintaining voltage stability and ensuring the accuracy of level control on the control end of the switching device Q1.
In a certain period time, the PWM signal input module inputs PWM square wave signals with different duty ratios according to a certain frequency to control the on and off of the switching device Q2, so that the on and off of the switching device Q1 can be controlled, and the current flowing through the shunt regulating circuit is regulated. Because the output current of the LED constant current driving module is constant, and the current value is equal to the sum of the current flowing through the shunt regulating circuit and the current of the LED module, the current of the LED module can be controlled by controlling the current flowing through the shunt regulating circuit, and the dimming function is further realized.
When the signal output by the PWM signal input module is low level, the switching device Q2 is closed, the control end of the switching device Q1 receives high level output by the starting pull-up resistor R1, at the moment, the switching device Q1 is opened, the current flowing through the load resistor R3 is larger, the current obtained by the LED module is small, the lamp is dark, and the dimming is deep; on the contrary, when the signal output by the PWM signal input module is at a high level, the switching device Q2 is turned on, the control end of the switching device Q1 receives a low level output by the pull-down bleeder resistor R2, at this time, the switching device Q1 is turned off, the current flowing through the load resistor R3 is 0, the current of the LED constant current driving module completely flows into the LED module, and the lamp is relatively bright.
In summary, by changing the duty ratio of the PWM signal input module in a certain period, the on time of the switching device Q1 and the switching device Q2 is changed, so that the current of the LED module can be changed in a certain range, and the dimming function is realized.
The deep dimming circuit provided in the embodiment has the advantages of simple structure, low cost and good dimming effect. The minimum output current of the circuit depends on the magnitude of the current flowing through the shunt regulating circuit, namely, the smaller the resistance value of the load resistor R3 is, the larger the current flowing through the shunt regulating circuit is, the smaller the current flowing through the LED module is, and the deeper the dimming depth is. The circuit is not limited by the performance and control precision of the control chip in the LED constant current driving module, and the PWM signal input is used for directly controlling the switch, so that the dimming effect and the dimming precision in a wider range can be realized, and the accurate control of the brightness of the LED product below ten thousandth can be realized.
In addition to the above embodiments, the technical features or technical data of the present utility model may be rearranged and combined within the scope of the claims and the description of the present utility model to constitute new embodiments, which may be implemented without inventive effort by those skilled in the art, and thus, embodiments of the present utility model not described in detail should be considered as embodiments of the present utility model within the scope of the protection of the present utility model.
Claims (7)
1. The utility model provides a degree of depth dimming circuit, its characterized in that, including AC/DC input module, LED constant current drive module, degree of depth dimming circuit module, LED module and with the PWM signal input module that degree of depth dimming circuit module electricity is connected, degree of depth dimming circuit module includes the reposition of redundant personnel governing circuit, reposition of redundant personnel governing circuit with the LED module is parallelly connected, PWM signal input module passes through clamping circuit and is connected with reposition of redundant personnel governing circuit control end electricity.
2. The deep dimming circuit of claim 1, wherein the AC/DC input module output is electrically connected to an LED constant current drive module input, the LED constant current drive module output is electrically connected to the deep dimming circuit module input, and the deep dimming circuit module output is electrically connected to the LED module input.
3. The deep dimming circuit according to claim 1, wherein the shunt regulating circuit comprises a load resistor R3, one end of the load resistor R3 is electrically connected with the anode of the LED constant current driving module, the other end of the load resistor R3 is electrically connected with a first non-control end of the switching device Q1, a second non-control end of the switching device Q1 is electrically connected with the cathode of the LED constant current driving module, and the control end is electrically connected with the clamping circuit.
4. A deep dimming circuit as claimed in claim 3, wherein the clamping circuit comprises a start pull-up resistor R1, one end of the start pull-up resistor R1 is electrically connected with the positive electrode of the LED constant current driving module, the other end is electrically connected with the control end of the switching device Q1 and one end of a pull-down bleeder resistor R2, the other end of the pull-down bleeder resistor R2 is electrically connected with the first non-control end of the switching device Q2, the control end of the switching device Q2 is electrically connected with the PWM signal input module, and the second non-control end of the switching device Q2 is grounded.
5. The deep dimming circuit of claim 4, wherein a zener diode ZD1 is electrically connected between the control terminal of the switching device Q1 and the second non-control terminal.
6. The deep dimming circuit of claim 4, wherein the types of switching devices Q1 and Q2 include, but are not limited to, MOSFETs, transistors, thyristors, relays.
7. The deep dimming circuit of claim 1 or 2, wherein the deep dimming circuit module is electrically connectable to one or more of the AC/DC input module, LED constant current driving module, LED module and PWM signal input module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322189133.5U CN220653567U (en) | 2023-08-15 | 2023-08-15 | Deep dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322189133.5U CN220653567U (en) | 2023-08-15 | 2023-08-15 | Deep dimming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220653567U true CN220653567U (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322189133.5U Active CN220653567U (en) | 2023-08-15 | 2023-08-15 | Deep dimming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220653567U (en) |
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2023
- 2023-08-15 CN CN202322189133.5U patent/CN220653567U/en active Active
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