CN214756999U

CN214756999U - LED dimming control circuit and LED lamp

Info

Publication number: CN214756999U
Application number: CN202120576019.6U
Authority: CN
Inventors: 钟友兴; 黄浩
Original assignee: Shenzhen Haozhi Technology Co ltd
Current assignee: Shenzhen Haozhi Technology Co ltd
Priority date: 2021-03-22
Filing date: 2021-03-22
Publication date: 2021-11-16
Anticipated expiration: 2031-03-22

Abstract

The utility model discloses a LED dimming control circuit and LED lamp, the LED dimming control circuit comprises a LED dimming control circuit, a controller, an ambient light sensor, a plurality of LED lamp strings and a driving circuit which is in one-to-one correspondence with the LED lamp strings; the ambient light sensor is connected to a signal input end of the controller; the plurality of LED lamp strings are connected in series between the power output end of the power conversion circuit and the driving end of the driving circuit; and the controlled end of the driving circuit is connected to the signal output end of the controller. LED dimming control circuit, through set up the change that ambient light sensor detected the ambient light in LED dimming control circuit, the controller of being convenient for adjusts the luminance and the colour of each way LED lamp cluster dynamically in real time and forms dynamic colour mixture transform according to the change of ambient light.

Description

LED dimming control circuit and LED lamp

Technical Field

The utility model relates to a LED drive technical field especially relates to a LED dimming control circuit and LED lamps and lanterns.

Background

At present, LED lamps in the market are various in variety, one of the LED lamps is an LED color mixing lamp which can be applied to outdoor lighting, advertising lamps, landscape lamps, home atmosphere lamps, network intelligent lamps and the like. Generally, a method for controlling an LED color mixing lamp includes: and a plurality of color mixing schemes are prestored on the controller, and the brightness, the color and the duration of each path of LED lamp bead are controlled by the controller to realize color mixing change. However, the control method of the color mixing lamp can only realize a few pre-stored changing effects, and cannot perform dynamic real-time follow-up control according to the on-site ambient light.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model aims to provide a LED dimming control circuit and LED lamps and lanterns provides, can control each way LED lamp pearl according to the change of site environment light for LED lamps and lanterns can follow the change of site environment light and change.

According to a first aspect of the present invention, there is provided an LED dimming control circuit, comprising a controller, an ambient light sensor, a plurality of LED lamp strings, and a driving circuit corresponding to each LED lamp string one to one; the ambient light sensor is connected to a signal input end of the controller; the plurality of LED lamp strings are connected in series between the power output end of the power conversion circuit and the driving end of the driving circuit; the controlled end of the driving circuit is connected to the signal output end of the controller;

the driving circuit comprises a driving chip; the driving chip is provided with a power supply voltage end, a dimming control end and a switch output end, wherein the power supply voltage end is connected to the power supply output end of the power supply conversion circuit, the dimming control end is the controlled end of the driving circuit and is connected to the signal output end of the controller, the switch output end is the driving end of the driving circuit, and the LED lamp string is connected in series between the switch output end and the power supply output end of the power supply conversion circuit.

In an optional embodiment, an energy storage inductor is further connected in series between the negative electrode of the LED light string and the switch output end of the driving chip; and the power output end of the power conversion circuit is sequentially connected with the LED lamp string, the energy storage inductor, the switch output end of the driving chip and the negative electrode of the power conversion circuit to form a closed charging loop.

In an optional embodiment, the driving circuit further comprises a freewheeling diode connected in anti-parallel between the switch output terminal and the power supply voltage terminal of the driving chip; and the discharge end of the energy storage inductor is sequentially connected with the freewheeling diode, the LED lamp string and the charge end of the energy storage inductor to form a closed discharge loop.

In an optional embodiment, the driving circuit further comprises a sampling resistor, the sampling resistor is connected in series between the power output end of the power conversion circuit and the anode of the LED light string, and a connection node of the sampling resistor and the anode of the LED light string forms a voltage sampling node; and the voltage sampling node is connected to the voltage sampling end of the driving chip.

In an optional embodiment, the system further comprises a wireless communication module; the wireless communication module is electrically connected with the data transmission end of the controller.

In an alternative embodiment, the display device further comprises a display panel; the display panel is electrically connected with the display signal output end of the controller.

In an optional embodiment, the system further comprises a key control module; the key control module is connected to the signal input end of the controller.

According to a second aspect of the present invention, there is provided an LED lamp, comprising the LED dimming control circuit and the power conversion circuit as described in any one of the above embodiments; the power conversion circuit is provided with an alternating current input end and a direct current output end, the alternating current input end of the power conversion circuit is connected to alternating current commercial power to obtain electricity, and the direct current output end of the power conversion circuit is connected to the LED dimming control circuit to provide direct current power.

Use the technical scheme of the utility model, through set up the change that the ambient light sensor detected the ambient light in LED dimming control circuit, the controller of being convenient for adjusts the luminance and the colour of each way LED lamp cluster in real time developments ground and forms dynamic colour mixture transform according to the change of ambient light.

For a better understanding and an implementation, the present invention is described in detail below with reference to the accompanying drawings.

Drawings

Fig. 1 is a schematic circuit structure diagram of an LED dimming control circuit according to a first embodiment of the present invention;

fig. 2 is a schematic circuit diagram of an ambient light sensor and a wireless communication module according to an embodiment of the present invention;

fig. 3 is a schematic circuit diagram of a first driving circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an internal circuit structure of the driving chip according to the embodiment of the present invention;

fig. 5 is a schematic circuit diagram of a second driving circuit according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a third driving circuit according to an embodiment of the present invention;

fig. 7 is a schematic circuit structure diagram of an LED dimming control circuit according to a second embodiment of the present invention;

fig. 8 is a schematic circuit diagram of a key control module according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of an LED lamp according to an embodiment of the present invention.

Detailed Description

The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. The present invention may, however, be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. Rather, these embodiments are provided to convey the scope of the invention to those skilled in the art.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the following, several specific embodiments are given for describing the technical solution of the present application in detail. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.

The general control method of the LED color mixing lamp comprises the following steps: and a plurality of color mixing schemes are prestored on the controller, and the brightness, the color and the duration of each LED lamp bead are controlled by the controller to realize color mixing change. However, the control method of pre-storing the color mixing scheme on the controller can only realize a few pre-stored changing effects, and cannot dynamically follow the control in real time according to the on-site ambient light.

To the technical problem, the first aspect of the present invention provides a LED dimming control circuit.

Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of an LED dimming control circuit according to an embodiment of the present invention.

The LED dimming control circuit comprises a controller 10, an ambient light sensor 20, a plurality of LED lamp strings 30 and driving circuits 40 which are in one-to-one correspondence with the LED lamp strings; the ambient light sensor 20 is connected to a signal input of the controller 10; the plurality of LED lamp strings 30 are connected in series between the power output end of the power conversion circuit and the driving end of the driving circuit 40; the controlled terminal of the driving circuit 40 is connected to the signal output terminal of the controller 10.

The LED dimming control circuit of this embodiment is provided with the ambient light sensor to detect the change of the ambient light, so that the controller can dynamically adjust the brightness and color of each LED string in real time according to the change of the ambient light to form dynamic color mixing conversion.

Referring to fig. 2, fig. 2 is a schematic circuit structure diagram of an ambient light sensor and a wireless communication module according to an embodiment of the present invention. The controller 10 is a control device of the LED lamp, and controls each LED string to turn on or off at different time intervals, so as to form a plurality of changeable LED color-mixing lamps. The manufacturer and model of the controller 10 may be selected according to the requirement, and are not limited herein.

The controller 10 is provided with an interrupt signal end, a signal input end, a signal output end, a power supply end, a data transmission end and a display signal output end, wherein the signal input end is connected with an ambient light sensor and used for collecting ambient light signals; the signal output end is connected with a driving circuit and used for driving and lighting the LED lamp string; the power supply end is connected to a direct-current power supply to obtain electricity, and the data transmission end is used for carrying out data transmission with communication modules such as a wireless communication module and the like; the display signal output end is connected with a display panel for displaying the state of the LED lamp.

The ambient light sensor 20 is configured to collect a change of ambient light, generate an ambient light conversion signal, and send the ambient light conversion signal to the controller 10, so that the controller 10 controls the LED light string to make corresponding changes according to the change of the ambient light. The interrupt terminal INT of the ambient light sensor 20 is connected to the interrupt signal terminal of the controller 10; its data signal terminal SDA is connected to the signal input terminal SDA of the controller 10 and its clock terminal SCL is connected to the signal input terminal SCL of the controller 10.

The plurality of LED lamp strings 30 may include three LED lamp strings of different colors, specifically, an LED red lamp string 31, an LED green lamp string 32, and an LED blue lamp string 33; each path of LED lamp string is connected with a plurality of lamp beads in series; the working voltage of each light string can be different, and can be specifically determined by the quantity of the lamp beads connected in series, if the lamp beads connected in series are more, the working voltage is needed to be larger, if the lamp beads connected in series are less, the working voltage is needed to be smaller, and the working voltage can be specifically between +5V and +24V, or even higher voltage. The LED dimming control circuit realizes various changeable mixed lights by turning on or turning off LED lamp strings with multiple colors in different time periods.

Referring to fig. 3, fig. 3 is a schematic circuit structure diagram of a first driving circuit according to an embodiment of the present invention.

The driving circuit 40 includes multiple driving circuits, which are a first driving circuit 41, a second driving circuit 42, and a third driving circuit 43, and each driving circuit is used for driving one of the LED strings to light up.

The first driving circuit 41 is used for driving the LED red light string 31, and the first driving circuit 41 includes a driving chip U201.

Referring to fig. 4, fig. 4 is a schematic diagram of an internal circuit structure of a driving chip according to an embodiment of the present invention.

The driving chip U201 is internally provided with a switching tube, and the outside of the driving chip U201 is provided with a power supply voltage end VIN, a dimming control end DIM, a switch output end SW and a voltage sampling end SEN. When the voltage detected by the voltage sampling end SEN meets the conduction condition of the switch tube, the switch tube is conducted to enable the switch output end SW to be grounded, and when the voltage detected by the voltage sampling end SEN does not meet the conduction condition of the switch tube, the switch tube is turned off to enable the SW to be not grounded.

The power supply voltage end VIN of the driving chip U201 is connected to the power supply output end of the power supply conversion circuit to obtain a direct current power supply, the dimming control end DIM is a controlled end of the driving circuit and is connected to the signal output end PWM _ R of the controller, the switch output end SW is a driving end of the driving circuit, and the LED red light string 31 is connected in series between the switch output end SW and the power supply output end of the power supply conversion circuit.

In an optional embodiment, an energy storage inductor is further connected in series between the negative electrode of the LED light string and the switch output end of the driving chip, and the power output end of the power conversion circuit is sequentially connected with the LED light string, the energy storage inductor, the switch output end of the driving chip, and the negative electrode of the power conversion circuit to form a closed charging loop.

In this embodiment, an energy storage inductor L201 is connected in series between the negative electrode of the LED red light string 31 and the switch output end of the driving chip U201, and the power output end VIN of the power conversion circuit is sequentially connected to the LED red light string 31, the energy storage inductor L201, the switch output end SW of the driving chip U201, and the negative electrode GND of the power conversion circuit to form a closed charging loop.

When the switch output end SW of the driving chip U201 is at a low level, the LED red light string 31 is turned on, and at this time, the current output by the power output end VIN flows through the LED red light string 31, the energy storage inductor L201, and the switch output end SW of the driving chip U201 and returns to the negative electrode GND of the power conversion circuit to form a charging loop to charge the energy storage inductor L201, and the LED red light string 31 is turned on.

In an optional embodiment, the driving circuit further includes a freewheeling diode D201, and the freewheeling diode D201 is connected in anti-parallel between the switch output terminal SW of the driving chip U201 and the power supply voltage terminal VIN; the discharging end of the energy storage inductor L201 is connected with the charging ends of the freewheeling diode D201, the LED red light string 31 and the energy storage inductor L201 in sequence to form a closed discharging loop. When the switch output end SW of the driving chip U201 is at a high level, a working loop cannot be formed, the LED red light string 31 is extinguished, at this time, the energy storage inductor L201 discharges, and a discharge current is generated to turn on the freewheeling diode D201, and the discharge current flows through the freewheeling diode D201, the LED red light string and returns to the charging end of the energy storage inductor L201, so that a discharge loop is formed to light the LED red light string 31. The driving circuit continuously provides stable current for the LED red light string to light the LED red light string.

In an optional embodiment, the driving circuit further includes a sampling resistor R201, the sampling resistor R201 is connected in series between the power output end of the power conversion circuit and the anode of the LED light string 31, and a connection node between the sampling resistor R201 and the anode of the LED light string 31 forms a voltage sampling node; the voltage sampling end SEN of the driving chip U201 is connected to the voltage sampling node to sample the operating voltage of the LED lamp string 31, so as to adjust the output of the driving signal to light the LED lamp string 31.

When the closed charging loop is conducted for the first time, the voltage detected by the voltage sampling end SEN of the driving chip is lower than 0.95V, the MOS tube inside the driving chip U201 is conducted to enable the switch output end SW to be grounded to form a loop, the LED red light string 31 is turned on, and the energy storage inductor L201 is charged. When the voltage detected by the voltage sampling end SEN is higher than 1.05V, the energy storage inductor L201 is considered to be fully charged, the MOS transistor in the driving chip U201 is turned off, so that the switch output end SW is not grounded, and a loop cannot be formed, the energy storage inductor L201 discharges, and the LED red light string 31 is lighted through the freewheeling diode D201, because the freewheeling diode D201 has a unidirectional conductive characteristic, the first working state is not affected. When the voltage sampling end SEN detects that the voltage is lower than 0.95V, the energy storage inductor L201 is considered to be completely discharged, the MOS tube in the driving chip U201 is started to enable the switch output end SW to be grounded to form a charging loop, and the next charging is started.

Description of the operating principle of the LED string 31: when the switch output end SW of the driving chip U201 outputs a low level, the LED red light string 31 is connected in series between the positive electrode and the negative electrode of the dc power supply and is lighted, and charges the energy storage inductor L201, the voltage sampling end SEN of the driving chip U201 samples the positive voltage of the LED red light string 31, when the voltage detected by the voltage sampling end SEN is higher than 1.05V, the energy storage inductor L201 is considered to be fully charged, the MOS transistor inside the driving chip U201 is turned off to make the switch output end SW ungrounded, and the energy storage inductor L201 discharges and lights the LED red light string 31 through the freewheeling diode D201.

Referring to fig. 5 and 6, fig. 5 is a schematic circuit structure diagram of a second driving circuit according to an embodiment of the present invention; fig. 6 is a schematic circuit diagram of a third driving circuit according to an embodiment of the present invention.

The LED green light string 32 is connected to the driving end of the second driving circuit 42, the LED blue light string 33 is connected to the driving end of the third driving circuit 43, and the circuit connection structure and the working principle are the same as the working principle of the LED red light string 31, which is not described herein again.

Referring to fig. 7, fig. 7 is a schematic circuit structure diagram of an LED dimming control circuit according to a second embodiment of the present invention.

In an optional embodiment, the LED dimming control circuit further includes a wireless communication module 50, and the wireless communication module 50 is electrically connected to the data transmission terminals (TXD and RXD) of the controller 10 to implement transceiving of the LED status data, so as to implement synchronous control of the wireless LED lamp. Specifically, the wireless communication module can be a bluetooth module, a WIFI module, a 2.4G module, a 4G module, a 5G module, and the like.

In an alternative embodiment, the LED dimming control circuit further comprises a display panel 60; the display panel 60 is electrically connected to the display signal output end of the controller 10, and is configured to receive the display driving signal from the controller 10 to display the operating state of the LED light string.

In an optional embodiment, the LED dimming control circuit further includes a key control module 70, please refer to fig. 4, and fig. 4 is a schematic circuit structure diagram of the key control module according to the embodiment of the present invention.

Please refer to fig. 8, fig. 8 is a schematic circuit structure diagram of a key control module according to an embodiment of the present invention.

The key control module 70 includes four keys (K1, K2, K3, and K4), all connected to the signal input terminal of the controller 10, for inputting key control signals (menu, up, down, ok) to control the lighting state of the LED lamp, and to select the color mixing scheme.

According to the utility model discloses a second aspect provides a LED lamps and lanterns. Referring to fig. 9, fig. 9 is a schematic structural diagram of an LED lamp according to an embodiment of the present invention.

The LED lamp comprises the LED dimming control circuit 100 and the power conversion circuit 200 according to any one of the above embodiments; the power conversion circuit 200 has an ac input terminal connected to the ac mains power supply and a dc output terminal connected to the LED dimming control circuit 100 for providing a dc power supply. Because the working voltage required by each street lamp string is different, the direct current output end can output direct current power supplies with a plurality of voltage values.

Because the working voltage of the LED lamp string is different from the working voltage of the controller and part of modules, and the working voltage of the controller is +3.3V, a voltage-stabilizing power supply circuit is also needed to be arranged to stabilize the DC power supply to +3.3V and supply the DC power supply to the controller, the ambient light sensor, the wireless communication module, the display panel, the key control module and the like.

In an optional embodiment, the LED dimming control circuit of the lamp includes three driving circuits, and a red LED light string, a green LED light string, and a blue LED light string respectively connected to the driving terminals of the driving circuits, and when the multi-color lamp is lit in different time intervals and the current magnitude control is different, a plurality of different colors can be mixed.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. An LED dimming control circuit, its characterized in that: the LED lamp comprises a controller, an ambient light sensor, a plurality of LED lamp strings and driving circuits corresponding to the LED lamp strings one by one; the ambient light sensor is connected to a signal input end of the controller; the plurality of LED lamp strings are connected in series between the power output end of the power conversion circuit and the driving end of the driving circuit; the controlled end of the driving circuit is connected to the signal output end of the controller; the driving circuit comprises a driving chip; the driving chip is provided with a power supply voltage end, a dimming control end and a switch output end, wherein the power supply voltage end is connected to the power supply output end of the power supply conversion circuit, the dimming control end is the controlled end of the driving circuit, the dimming control end is connected to the signal output end of the controller, the switch output end is the driving end of the driving circuit, and the LED lamp string is connected in series between the switch output end and the power supply output end of the power supply conversion circuit.

2. The LED dimming control circuit of claim 1, wherein: an energy storage inductor is also connected in series between the negative electrode of the LED lamp string and the switch output end of the driving chip; and the power output end of the power conversion circuit is sequentially connected with the LED lamp string, the energy storage inductor, the switch output end of the driving chip and the negative electrode of the power conversion circuit to form a closed charging loop.

3. The LED dimming control circuit of claim 2, wherein: the driving circuit further comprises a freewheeling diode which is reversely connected in parallel between the switch output end of the driving chip and the power supply voltage end; and the discharge end of the energy storage inductor is sequentially connected with the freewheeling diode, the LED lamp string and the charge end of the energy storage inductor to form a closed discharge loop.

4. The LED dimming control circuit of claim 1, wherein: the drive circuit further comprises a sampling resistor, the sampling resistor is connected in series between the power output end of the power conversion circuit and the anode of the LED lamp string, and a connection node of the sampling resistor and the anode of the LED lamp string forms a voltage sampling node; and the voltage sampling node is connected to the voltage sampling end of the driving chip.

5. The LED dimming control circuit of claim 1, wherein: the system also comprises a wireless communication module; the wireless communication module is electrically connected with the data transmission end of the controller.

6. The LED dimming control circuit of claim 1, wherein: also includes a display panel; the display panel is electrically connected with the display signal output end of the controller.

7. The LED dimming control circuit of claim 1, wherein: the device also comprises a key control module; the key control module is connected to the signal input end of the controller.

8. An LED lamp, characterized in that: the LED dimming control circuit comprises the LED dimming control circuit and the power conversion circuit according to any one of claims 1 to 7; the power conversion circuit is provided with an alternating current input end and a direct current output end, the alternating current input end of the power conversion circuit is connected to alternating current commercial power to obtain electricity, and the direct current output end of the power conversion circuit is connected to the LED dimming control circuit to provide direct current power.