CN221842725U - Low-cost dimming circuit - Google Patents

Abstract

The utility model discloses a low-cost dimming circuit, comprising a dimming control module, a circuit serial port and a common driving module, wherein the circuit serial port comprises a VCC interface, a signal interface and a GND interface, the dimming control module is electrically connected to one end of the circuit serial port, and the common driving module is electrically connected to the other end of the circuit serial port in a one-to-one correspondence, with a simple structure and low cost.

Description

A low-cost dimming circuit

Technical Field

The utility model relates to the technical field of LED dimming, in particular to a low-cost dimming circuit.

Background Art

LED loads generally require a dimming circuit to perform dimming control. Existing dimming circuits generally include a dimming control module and a driving circuit module. The dimming control module uses wired dimming control (such as DALI, 0/1-10V, thyristor, DMX) or wireless dimming control (such as Zigbee, Bluetooth, WiFi, LoRa, etc.). The driving circuit module matching the wired or wireless dimming control module generally uses a more complex driving circuit (including a complex thyristor unit, feedback unit, etc.), resulting in a complex circuit structure and high cost.

Utility Model Content

The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a low-cost dimming circuit with a simple circuit structure.

According to the low-cost dimming circuit of the embodiment of the utility model, it includes a dimming control module, a circuit serial port and a common drive module, the circuit serial port includes a VCC interface, a signal interface and a GND interface, the dimming control module is electrically connected to one end of the circuit serial port, and the common drive module is electrically connected to the other end of the circuit serial port in a one-to-one correspondence.

According to some embodiments of the utility model, the common driving module includes a rectifier and filter unit, a power conversion unit and a PWM chip unit, the input end of the rectifier and filter unit is electrically connected to the mains, the output end of the rectifier and filter unit is electrically connected to the output end of the power conversion unit and the power supply end of the PWM chip unit respectively, the output end of the PWM chip unit is electrically connected to the power conversion unit, the signal end of the PWM chip unit is electrically connected to the signal end of the dimming control module through the signal interface of the circuit serial port, the power conversion unit supplies power to the dimming control module through the VCC interface of the circuit serial port, and the output end of the power conversion unit is electrically connected to the LED load.

According to some embodiments of the present invention, the dimming control module includes a wired dimming control module and a wireless dimming control module.

According to some embodiments of the utility model, the rectifier and filter unit includes a rectifier bridge BD1, a capacitor C1, a capacitor C2 and an inductor L1, the AC end of the rectifier bridge BD1 is electrically connected to the mains, the positive DC end of the rectifier bridge BD1 is electrically connected to one end of the capacitor C1, one end of the inductor L1 and one end of the capacitor C2, respectively, the negative DC end of the rectifier bridge BD1 is electrically connected to the other end of the capacitor C1 and the other end of the capacitor C2, and the other end of the inductor L1 is electrically connected to the power conversion unit.

According to some embodiments of the utility model, the rectification and filtering unit also includes a diode D1 and a diode D2, the anode of the diode D1 is electrically connected to one end of the inductor L1, the anode of the diode D2 is electrically connected to the other end of the inductor L1, and the cathode of the diode D1 is electrically connected to the cathode of the diode D2 and the power conversion module respectively.

According to some embodiments of the present utility model, the power conversion unit includes a transformer T1, the primary side of the transformer T1 includes a coil T1A and a coil T1C, the secondary side of the transformer T1 includes a coil T1B, one end of the coil T1A is electrically connected to the cathode of the diode D1 and the cathode of the diode D2, respectively, the other end of the coil T1A is electrically connected to the ground end of the PWM chip unit, the coil T1C is electrically connected to the feedback end of the PWM chip unit, and the coil T1B is electrically connected to the LED load.

According to some embodiments of the present utility model, the PWM chip unit includes a PWM chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6, one end of the resistor R1 is electrically connected to the coil T1C, the other end of the resistor R1 is electrically connected to the resistor R2 and the FB pin of the PWM chip U1 respectively, the PWM pin of the PWM chip U1 is electrically connected to the PWM end of the dimming control module via the series resistor R3, the resistor R4, the resistor R5 and the resistor R6 are connected in parallel to form a parallel circuit, and the CS pin of the PWM chip U1 is electrically connected to the ground end of the dimming control module via the series connection of the parallel circuit.

According to some embodiments of the present invention, a feedback unit is also included, which includes a feedback chip U2, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, the FB pin of the feedback chip is electrically connected to one end of the resistor R7 and the resistor R8, respectively, the other end of the resistor R8 is electrically connected to the output end of the rectifier and filter unit, and the CS pin of the feedback chip U2 is electrically connected to the resistor R9 and the resistor R10, respectively.

According to some embodiments of the present invention, an output filter unit is also included, which includes a capacitor C3 and a power coil LF1. The capacitor C3 is electrically connected to the output end of the power conversion unit and the input end of the power coil LF1 respectively, and the output end of the power coil LF1 is electrically connected to the LED load.

The low-cost dimming circuit according to the embodiment of the utility model has at least the following beneficial effects: since the circuit includes an existing dimming control module with good dimming effect and an ordinary driving module with a simple circuit structure, the dimming control module can be electrically connected to each port of the ordinary driving module one by one through the circuit serial port. Therefore, compared with the current dimming driving circuit with a complex overall circuit structure, it can not only achieve good dimming, but also has a simple structure and low cost.

Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The specific implementation of the utility model is further described below in conjunction with the accompanying drawings;

FIG1 is a block diagram of a low-cost dimming circuit;

FIG2 is a schematic diagram showing the electrical connection between a wired dimming control module and a common driving module of a low-cost dimming circuit;

FIG. 3 is a schematic diagram showing the electrical connection between a wireless dimming control module and a common driving module of a low-cost dimming circuit.

DETAILED DESCRIPTION

This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

1 to 3, the utility model discloses a low-cost dimming circuit, including a dimming control module, a circuit serial port 10 and a common driving module. The dimming control module is an existing module using wired or wireless dimming. The circuit serial port includes a VCC interface, a signal interface and a GND interface. The dimming control module is electrically connected to one end of the circuit serial port, and the common driving module is electrically connected to the other end of the circuit serial port in a one-to-one correspondence.

As shown in Figures 2 and 3, in some embodiments, the common driving module includes a rectifier and filter unit 21, a power conversion unit 22 and a PWM chip unit 23. The input end of the rectifier and filter unit 21 is electrically connected to the mains, the output end of the rectifier and filter unit 21 is electrically connected to the output end of the power conversion unit 22 and the power supply end of the PWM chip unit 23 respectively, the output end of the PWM chip unit 23 is electrically connected to the power conversion unit 22, the signal end of the PWM chip unit 23 is electrically connected to the signal end of the dimming control module through the signal interface of the circuit serial port, the power conversion unit 22 supplies power to the dimming control module through the VCC interface of the circuit serial port, the output end of the power conversion unit 22 is electrically connected to the LED load, the structure is simple, and the cost is low. The existing dimming control module controls the operation of the PWM chip unit 23 through the circuit serial port, and the power conversion unit 22 supplies power to the dimming control module through the VCC interface, thereby effectively realizing dimming drive.

The rectifier and filter unit 21 includes a rectifier bridge BD1, a capacitor C1, a capacitor C2 and an inductor L1. The AC end of the rectifier bridge BD1 is electrically connected to the mains, the positive DC end of the rectifier bridge BD1 is electrically connected to one end of the capacitor C1, one end of the inductor L1 and one end of the capacitor C2 respectively, the negative DC end of the rectifier bridge BD1 is electrically connected to the other end of the capacitor C1 and the other end of the capacitor C2, and the other end of the inductor L1 is electrically connected to the power conversion unit 22. The rectifier and filter unit 21 also includes a diode D1 and a diode D2. The anode of the diode D1 is electrically connected to one end of the inductor L1, the anode of the diode D2 is electrically connected to the other end of the inductor L1, and the cathode of the diode D1 is electrically connected to the cathode of the diode D2 and the power conversion module respectively.

The power conversion unit 22 includes a transformer T1, the primary side of the transformer T1 includes a coil T1A and a coil T1C, the secondary side of the transformer T1 includes a coil T1B, one end of the coil T1A is electrically connected to the cathode of the diode D1 and the cathode of the diode D2 respectively, the other end of the coil T1A is electrically connected to the ground end of the PWM chip unit 23, the coil T1C is electrically connected to the feedback end of the PWM chip unit 23, and the coil T1B is electrically connected to the LED load.

The PWM chip unit 23 includes a PWM chip U1, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6. One end of the resistor R1 is electrically connected to the coil T1C, and the other end of the resistor R1 is electrically connected to the resistor R2 and the FB pin of the PWM chip U1 respectively. The PWM pin of the PWM chip U1 is electrically connected to the PWM end of the dimming control module via the series resistor R3. The resistors R4, R5 and R6 are connected in parallel to form a parallel circuit. The CS pin of the PWM chip U1 is electrically connected to the ground end of the dimming control module via the series parallel circuit.

It also includes a feedback unit 24, which includes a feedback chip U2, a resistor R7, a resistor R8, a resistor R9 and a resistor R10. The FB pin of the feedback chip is electrically connected to one end of the resistor R7 and the resistor R8 respectively, and the other end of the resistor R8 is electrically connected to the output end of the rectifier and filter unit 21. The CS pin of the feedback chip U2 is electrically connected to the resistor R9 and the resistor R10 respectively, and the DC output of the power conversion unit 22 is regulated according to the voltage signal on the voltage-dividing resistors R7 and R8.

It also includes an output filter unit 25, which includes a capacitor C3 and a power coil LF1. The capacitor C3 is electrically connected to the output end of the power conversion unit 22 and the input end of the power coil LF1 respectively. The output end of the power coil LF1 is electrically connected to the LED load to effectively filter the output end.

Since the circuit includes an existing dimming control module with good dimming effect and an ordinary driving module with a simple circuit structure, the dimming control module can be electrically connected to each port of the ordinary driving module one by one through the circuit serial port. Therefore, compared with the current dimming driving circuit with a complex overall circuit structure, it can not only achieve good dimming, but also has a simple structure and low cost.

It is easy for those skilled in the art to understand that the above preferred embodiments can be freely combined and superimposed without conflict.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention specification and drawings under the utility model concept, or directly or indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims (9)

1. A low cost dimming circuit comprising:

The circuit serial port (10) comprises a VCC interface, a signal interface and a GND interface, wherein the dimming control module is electrically connected with one end of the circuit serial port (10), and the common driving module is electrically connected with the other end of the circuit serial port (10) in one-to-one correspondence.

2. The low cost dimming circuit of claim 1, wherein:

The common driving module comprises a rectifying and filtering unit (21), a power conversion unit (22) and a PWM chip unit (23), wherein the input end of the rectifying and filtering unit (21) is connected with mains supply, the output end of the rectifying and filtering unit (21) is respectively and electrically connected with the output end of the power conversion unit (22) and the power supply end of the PWM chip unit (23), the output end of the PWM chip unit (23) is electrically connected with the power conversion unit (22), the signal end of the PWM chip unit (23) is electrically connected with the signal end of the dimming control module through a signal interface of the circuit serial port (10), the power conversion unit (22) supplies power to the dimming control module through a VCC interface of the circuit serial port (10), and the output end of the power conversion unit (22) is electrically connected with an LED load.

3. The low cost dimming circuit of claim 1, wherein:

The dimming control module comprises a wired dimming control module and a wireless dimming control module.

4. The low cost dimming circuit of claim 2, wherein:

The rectifying and filtering unit (21) comprises a rectifying bridge BD1, a capacitor C2 and an inductor L1, wherein an alternating current end of the rectifying bridge BD1 is connected with mains supply, a positive direct current end of the rectifying bridge BD1 is respectively connected with one end of the capacitor C1, one end of the inductor L1 and one end of the capacitor C2, a negative direct current end of the rectifying bridge BD1 is electrically connected with the other end of the capacitor C1 and the other end of the capacitor C2, and the other end of the inductor L1 is electrically connected with the power conversion unit (22).

5. The low cost dimming circuit of claim 4, wherein:

The rectifying and filtering unit (21) further comprises a diode D1 and a diode D2, wherein the anode of the diode D1 is electrically connected with one end of the inductor L1, the anode of the diode D2 is electrically connected with the other end of the inductor L1, and the cathode of the diode D1 is electrically connected with the cathode of the diode D2 and the power conversion unit respectively.

6. The low cost dimming circuit of claim 5, wherein:

The power conversion unit (22) comprises a transformer T1, a primary side of the transformer T1 comprises a coil T1A and a coil T1C, a secondary side of the transformer T1 comprises a coil T1B, one end of the coil T1A is respectively and electrically connected with a cathode of the diode D1 and a cathode of the diode D2, the other end of the coil T1A is electrically connected with a grounding end of the PWM chip unit (23), the coil T1C is electrically connected with a feedback end of the PWM chip unit (23), and the coil T1B is electrically connected with an LED load.

7. The low cost dimming circuit of claim 6, wherein:

The PWM chip unit (23) comprises a PWM chip U1, a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a resistor R6, one end of the resistor R1 is electrically connected with a coil T1C, the other end of the resistor R1 is respectively electrically connected with the resistor R2 and a FB pin of the PWM chip U1, the PWM pin of the PWM chip U1 is electrically connected with a PWM end of the dimming control module through a series resistor R3, the resistor R4, the resistor R5 and the resistor R6 are connected in parallel to form a parallel circuit, and a CS pin of the PWM chip U1 is electrically connected with a grounding end of the dimming control module through the series circuit.

8. The low cost dimming circuit of claim 2, wherein: the feedback unit (24) comprises a feedback chip U2, a resistor R7, a resistor R8, a resistor R9 and a resistor R10, FB pins of the feedback chip are respectively and electrically connected with one ends of the resistor R7 and the resistor R8, the other ends of the resistor R8 are electrically connected with the output end of the rectifying and filtering unit (21), and CS pins of the feedback chip U2 are respectively and electrically connected with the resistor R9 and the resistor R10.

9. The low cost dimming circuit of claim 2, wherein: the LED power conversion device further comprises an output filter unit (25), the output filter unit (25) comprises a capacitor C3 and a power coil LF1, the capacitor C3 is respectively and electrically connected with the output end of the power conversion unit (22) and the input end of the power coil LF1, and the output end of the power coil LF1 is electrically connected with an LED load.