CN219697936U - LED light modulator circuit - Google Patents
LED light modulator circuit Download PDFInfo
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- CN219697936U CN219697936U CN202320157477.5U CN202320157477U CN219697936U CN 219697936 U CN219697936 U CN 219697936U CN 202320157477 U CN202320157477 U CN 202320157477U CN 219697936 U CN219697936 U CN 219697936U
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- 230000001360 synchronised effect Effects 0.000 abstract description 5
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- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
The utility model discloses an LED dimmer circuit which comprises a voltage reference chip, a voltage dividing resistor and a voltage regulating resistor module, wherein the voltage reference chip is connected with the voltage dividing resistor module; the voltage dividing resistor and the voltage regulating resistor module are connected in series; the voltage regulating resistor module is arranged between the cathode of the voltage reference chip and the reference input end in parallel, and the voltage regulating resistor module is connected with the cathode of the voltage reference chip to form a first common end; the voltage dividing resistor is arranged between the anode of the voltage reference chip and the reference input end in parallel, and the voltage dividing resistor is connected with the anode of the voltage reference chip to form a second common end, and the second common end is grounded. The utility model provides a novel dimmer, which allows dimming input ends of one or more LED driving power supplies to be connected between a first public end and a second public end in parallel, realizes multi-path convenient and stable synchronous dimming, and has simple and reliable regulation mode without additional power supply.
Description
Technical Field
The utility model relates to the field of dimmers, in particular to an LED dimmer circuit.
Background
The LED driving power supply can be used for converting commercial power supply into direct current constant current to drive the LED load to emit light. Most LED driving power supplies can be externally connected with a dimmer to adjust the current output to the LED load so as to change the brightness of illumination, i.e. dimming. Commercial lighting requires a large use of LED driving power. If the dimming equipment is configured for each LED driving power supply independently, the dimming equipment needs to be controlled one by one during dimming, so that synchronous dimming consistent with coordination cannot be completed through a plurality of LED driving power supplies, and the cost is increased.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an LED dimmer circuit for realizing synchronous dimming of a plurality of LED driving power supplies.
The technical scheme adopted for solving the technical problems is as follows: an LED dimmer circuit is provided for regulating the voltage of dimming input ends of a plurality of LED driving power supplies connected in parallel with the LED dimmer circuit, so as to simultaneously dim LED loads connected with the LED driving power supplies, and is characterized by comprising a voltage reference chip, a voltage dividing resistor and a voltage regulating resistor module;
the voltage dividing resistor and the voltage regulating resistor module are connected in series;
the voltage regulating resistor module is arranged between the cathode of the voltage reference chip and the reference input end in parallel, and the voltage regulating resistor module is connected with the cathode of the voltage reference chip to form a first common end;
the voltage dividing resistor is arranged between the anode of the voltage reference chip and the reference input end in parallel, the voltage dividing resistor is connected with the anode of the voltage reference chip to form a second common end, and the second common end is grounded;
the reference input end of the voltage reference chip is connected with the voltage dividing resistor and the voltage regulating resistor module to form a third common end;
when the input is a constant current source, the voltage between the first common terminal and the third common terminal is regulated by regulating the resistance value of the voltage regulating resistor module, so that the voltage of the dimming input terminal of the LED driving power supply connected in parallel between the first common terminal and the second common terminal is regulated; and the reference input end of the voltage reference chip acquires a feedback voltage signal of the third common end and stabilizes the regulated voltage between the first common end and the second common end.
Preferably, the voltage regulating resistor module comprises a variable resistor;
the first fixed end of the variable resistor is connected with the first common end, and the adjusting end of the variable resistor is connected with the third common end; or (b)
The first fixed end of the variable resistor is connected with the third common end, and the adjusting end of the variable resistor is connected with the first common end.
Preferably, the voltage regulating resistor module comprises a single-pole multi-throw switch and a plurality of voltage regulating resistors with different resistance values;
each fixed contact of the single-pole multi-throw switch is connected with the first common end through one voltage regulating resistor, and the movable contact of the single-pole multi-throw switch is connected with the third common end; or (b)
Each fixed contact of the single-pole multi-throw switch is connected with the third common end through one voltage regulating resistor, and the movable contact of the single-pole multi-throw switch is connected with the first common end.
Preferably, the voltage at the third common is, for example, 1.25V or 2.5V when the input is a constant current source.
The implementation of the utility model has the following beneficial effects: the dimming input ends of one or more LED driving power supplies are allowed to be connected between the first public end and the second public end in parallel, the voltage between the first public end and the second public end is regulated by regulating the resistance value of the voltage regulating resistor module, and then multipath convenient and stable synchronous dimming can be realized on LED loads connected with the LED driving power supplies, and the regulating mode is simple and reliable.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a circuit diagram of one embodiment of an LED dimmer circuit of the present utility model;
fig. 2 is a circuit diagram of an embodiment of an LED dimmer circuit of the present utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
The LED dimmer circuit is used for regulating the voltage of a plurality of LED driving power supplies connected in parallel with the LED dimmer circuit, so as to regulate the light of an LED load connected with the LED driving power supplies. And a part of common LED driving power supply is provided with a 0-10V dimming signal line for sending a dimming signal with the voltage range of 0-10V to the ground, so that the output current is regulated. The inside of which comprises a constant current source of 0.1 mA. The constant current sources of the plurality of LED driving power supplies generate voltage drops through the LED dimmer circuit, and the obtained voltage drops serve as dimming voltages for dimming. The dimming voltage is transmitted to the LED driving power supply through the 0-10V dimming signal line, the higher the dimming voltage is, the larger the current output to the LED load by the LED driving power supply is, the brighter the LED load is, and the full brightness is achieved when the dimming voltage is 10V.
Referring to fig. 1, in an embodiment, the LED dimmer circuit of the present embodiment includes a voltage reference chip T, a voltage dividing resistor R2, and a voltage adjusting resistor module R1.
The voltage dividing resistor R2 and the voltage regulating resistor module R1 are arranged in series. The voltage dividing resistor R2 is arranged between the anode of the voltage reference chip T and the reference input end in parallel, and the voltage dividing resistor R2 and the anode of the voltage reference chip T are connected to form a second common end GND which is grounded. The voltage regulating resistor module R1 is arranged between the cathode of the voltage reference chip T and the reference input end in parallel, and the voltage regulating resistor module R1 is connected with the cathode of the voltage reference chip T to form a first common end DIM. The reference input end of the voltage reference chip T is connected with the voltage dividing resistor R2 and the voltage regulating resistor module R1 to form a third common end 3. The second common terminal GND is a wire ground terminal, and the second common terminal GND is grounded, so that the voltage at the second common terminal GND is 0V, and the voltage value at the third common terminal 3 is equal to the voltage drop generated by the voltage dividing resistor R2.
In the LED dimmer circuit of the present embodiment, the reference input end of the voltage reference chip T obtains the feedback voltage signal of the third common terminal 3, and stabilizes the voltage between the adjusted first common terminal DIM and the second common terminal GND.
Specifically, dimming signal lines of one or more LED driving power supplies are connected in parallel between a first common terminal DIM and a second common terminal GND, and constant current sources inside the power supplies input constant current through the dimming signal lines, and voltage between the first common terminal DIM and the second common terminal GND is a dimming voltage output to the LED driving power supplies. And the voltage reference chip is used for stabilizing the voltage between the first common terminal DIM and the second common terminal GND, so that the dimming voltage is stabilized, and the stable dimming of the LED load is realized.
The voltage at the third common terminal 3 acts as a feedback voltage signal, which is equal to the reference voltage Vref due to the action of the voltage reference chip T. In an alternative embodiment, the voltage at the third common is Vref, for example 1.25V or 2.5V, when the input is a constant current source. According to actual needs, voltage reference chips with different reference voltages can be selected to control the voltage at the third common terminal. When the voltage required at the third common terminal is 1.25V, a TLV431 type voltage reference chip may be selected; when the voltage required at the third common terminal is 2.5V, a TL431 type voltage reference chip may be selected. It will be appreciated that other types of voltage reference chips may be selected.
Therefore, the dimming voltage Vout between the first common terminal DIM and the second common terminal GND is also in a regulated state, expressed as:
in the above formula, the dimming voltage is only related to the reference voltage, the voltage regulating resistor module R1 and the voltage dividing resistor R2, and is not related to the number of parallel LED driving power sources.
In the LED dimmer circuit of the present embodiment, when the input is a constant current source, the voltage between the first common terminal DIM and the third common terminal GND is adjusted by adjusting the resistance value of the voltage adjusting resistor module R1, so as to adjust the voltage of the dimming input terminal of the LED driving power supply connected in parallel between the first common terminal DIM and the second common terminal GND. When the reference voltage and the voltage dividing resistor R2 are determined, the dimming voltage input into the LED driving power supply from the dimming signal line can be changed through the resistance value of the voltage regulating resistor module R1, so that the current input into the LED load is changed, and dimming is realized.
In an alternative embodiment, the voltage regulating resistor module R1 includes a variable resistor. The first fixed end of the variable resistor is connected with the first common end DIM, and the adjusting end of the variable resistor is connected with the third common end 3; the first fixed end of the variable resistor is connected to the third common terminal 3 and the adjusting end of the variable resistor is connected to the first common terminal DIM.
Specifically, a potentiometer or a sliding rheostat can be used as a variable resistor, and is connected into a circuit, and the position of a contact on a resistor body is changed by rotating or sliding an adjusting end so as to adjust the resistance value of the voltage-adjusting resistor module R1, thereby adjusting the dimming voltage between the first common end DIM and the second common end GND. Further, the other fixed end of the variable resistor may be selectively connected or disconnected.
In an alternative embodiment, referring to fig. 2, the voltage regulating resistor module R1 includes a single pole, multi-throw switch S and several voltage regulating resistors of different resistance values. Each fixed contact of the single-pole multi-throw switch S is connected with a first common terminal DIM through a voltage regulating resistor, and the movable contact of the single-pole multi-throw switch S is connected with a third common terminal 3. In another alternative embodiment, each stationary contact of the single-pole multi-throw switch S is connected to the third common terminal 3 through a voltage regulating resistor, and the movable contact of the single-pole multi-throw switch S is connected to the first common terminal DIM.
Specifically, the number of single pole multiple throw switches S and voltage regulating resistors of different resistance values is determined according to the number of dimming stages required. For example, if six-gear dimming is required, six voltage-regulating resistors with different resistance values may be selected. Each fixed contact of the single-pole multi-throw switch S is respectively connected with a voltage regulating resistor, the resistance value of each voltage regulating resistor is different, and the movable contact and different fixed contacts are closed, so that dimming with different brightness can be realized.
The LED dimmer circuit in this embodiment does not need to provide an additional power supply, and only needs to be connected in parallel with the dimming signal lines of one or more LED driving power supplies, the constant current source current provided in the power supply flows in from the first common terminal DIM via the dimming signal lines, flows out from the second common terminal GND, and the obtained voltage drop is used as the dimming voltage sent to the dimming signal lines of the LED driving power supplies. The light-adjusting voltage obtained by the circuit cannot change no matter how many constant-current sources are connected in parallel, so that the LED light-adjusting circuit in the embodiment can adjust a single LED driving power supply or synchronously adjust a plurality of LED driving power supplies. The dimming voltage is regulated by regulating the voltage regulating resistor module R1, and the regulated dimming voltage is stabilized by the voltage reference chip T, so that the convenient and stable synchronous dimming of the LED load connected with the LED driving power supply can be realized.
It is to be understood that the above examples illustrate only a portion of the embodiments of the utility model and are therefore not to be considered limiting of its scope; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (4)
1. An LED dimmer circuit for adjusting the voltage of the dimming input ends of a plurality of LED driving power supplies connected in parallel with the LED dimmer circuit so as to simultaneously dim LED loads connected with the LED driving power supplies is characterized by comprising a voltage reference chip, a voltage dividing resistor and a voltage regulating resistor module;
the voltage dividing resistor and the voltage regulating resistor module are connected in series;
the voltage regulating resistor module is arranged between the cathode of the voltage reference chip and the reference input end in parallel, and the voltage regulating resistor module is connected with the cathode of the voltage reference chip to form a first common end;
the voltage dividing resistor is arranged between the anode of the voltage reference chip and the reference input end in parallel, the voltage dividing resistor is connected with the anode of the voltage reference chip to form a second common end, and the second common end is grounded;
the reference input end of the voltage reference chip is connected with the voltage dividing resistor and the voltage regulating resistor module to form a third common end;
when the input is a constant current source, the voltage between the first common terminal and the third common terminal is regulated by regulating the resistance value of the voltage regulating resistor module, so that the voltage of the dimming input terminal of the LED driving power supply connected in parallel between the first common terminal and the second common terminal is regulated; and the reference input end of the voltage reference chip acquires a feedback voltage signal of the third common end and stabilizes the regulated voltage between the first common end and the second common end.
2. The LED dimmer circuit of claim 1, wherein the voltage regulator resistor module comprises a variable resistor;
the first fixed end of the variable resistor is connected with the first common end, and the adjusting end of the variable resistor is connected with the third common end; or (b)
The first fixed end of the variable resistor is connected with the third common end, and the adjusting end of the variable resistor is connected with the first common end.
3. The LED dimmer circuit of claim 1, wherein the voltage regulator resistor module comprises a single pole, multi-throw switch and a plurality of voltage regulator resistors of different resistance values;
each fixed contact of the single-pole multi-throw switch is connected with the first common end through one voltage regulating resistor, and the movable contact of the single-pole multi-throw switch is connected with the third common end; or (b)
Each fixed contact of the single-pole multi-throw switch is connected with the third common end through one voltage regulating resistor, and the movable contact of the single-pole multi-throw switch is connected with the first common end.
4. The LED dimmer circuit of claim 1, wherein the voltage at the third common terminal is 1.25V or 2.5V when the input is a constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320157477.5U CN219697936U (en) | 2023-02-08 | 2023-02-08 | LED light modulator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320157477.5U CN219697936U (en) | 2023-02-08 | 2023-02-08 | LED light modulator circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219697936U true CN219697936U (en) | 2023-09-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320157477.5U Active CN219697936U (en) | 2023-02-08 | 2023-02-08 | LED light modulator circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219697936U (en) |
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2023
- 2023-02-08 CN CN202320157477.5U patent/CN219697936U/en active Active
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