Multi-mode LED control circuit and intelligent luminaire

Abstract

The utility model discloses a kind of multi-mode LED control circuit and intelligent lamps and lanterns, applied to power electronics technical field, to solve the problem of LED lamp color control confusion when switching back to zero code control from other control modes in prior art, specifically comprising: zero code constant current control module generates first lamp string control signal according to the control signal of zero code format, and the current of each LED lamp string is adjusted according to first lamp string control signal;Induction control module detects external object and generates second lamp string control signal, and the lighting or extinguishing of each LED lamp string is controlled according to second lamp string control signal;Mode selection module connects the positive end of each LED lamp string and the connection of induction control module or external power supply. In this way, all control signals in zero code constant current control module are kept in hot backup state during mode switching process by continuous power supply, avoiding the problem of LED lamp color confusion when switching back to zero code control.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a multi-mode LED control circuit and intelligent lighting fixture. Background Technology

[0002] LEDs (Light Emitting Diodes) are widely used in lighting, displays, and decoration due to their high efficiency and energy saving. Return-to-Zero (RZ) coding is a common encoding method widely used in LED control devices. RZ-based LED control devices typically employ an event-triggered mechanism, meaning the control terminal sends discrete RZ signals only when the user requests a state change; there is no continuous signal output during stable operation. This intermittent signal transmission characteristic makes the RZ signal exhibit a discontinuous timing pattern.

[0003] Currently, LED control devices often need to dynamically switch modes according to operating conditions, such as switching from sensor-based induction control to zero-code control mode, or vice versa. However, during the switch from other LED control modes back to zero-code control, due to the discontinuous timing characteristics of the zero-code signal and the reinitialization of the zero-code constant current control module during the mode switch back to zero-code control, the LED control device often fails to correctly restore the original zero-code control state. This leads to chaotic control of the LED light colors, manifesting as color fluctuations, unstable brightness, or display effects that do not meet expectations. This situation not only affects the operational reliability of the LED control device but also significantly reduces the user experience for end users. Utility Model Content

[0004] This utility model provides a multi-mode LED control circuit and intelligent lighting fixture to solve the problem in the prior art where the control of LED color becomes chaotic when switching from other LED control modes back to zero-code control.

[0005] The technical solution provided by this utility model embodiment is as follows:

[0006] On the one hand, this utility model embodiment provides a multi-mode LED control circuit, including: a zero-code constant current control module, an induction control module, and a mode selection module;

[0007] The input terminal of the zero-code constant current control module is connected to the output terminal of the external control terminal, the power supply terminal of the zero-code constant current control module is connected to the external power supply, and each output terminal of the zero-code constant current control module is connected to the negative terminal of the corresponding LED string. The zero-code constant current control module is used to receive the zero-code format control signal output by the external control terminal, generate the first LED string control signal according to the zero-code format control signal, and adjust the current of each LED string according to the first LED string control signal.

[0008] The first end of the mode selection module is connected to the positive end of each LED string, the second end of the mode selection module is connected to the sensing control module, and the third end of the mode selection module is connected to the external power supply. The sensing control module is used to detect external objects and generate a second LED string control signal, and control the lighting or turning off of each LED string according to the second LED string control signal.

[0009] The mode selection module is used to connect the positive terminal of each LED string to the sensing control module, or to connect the positive terminal of each LED string to an external power supply.

[0010] Optionally, the mode selection module includes: a first single-pole double-throw switch, a first MOSFET, a second MOSFET, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0011] The stationary contact of the first single-pole double-throw switch is connected to the external power supply and the source of the first MOSFET respectively. The first moving contact of the first single-pole double-throw switch is connected to the input terminal of the induction control module. The second moving contact of the first single-pole double-throw switch is connected to ground in sequence through the first resistor and the second resistor.

[0012] The drain of the first MOSFET is connected to the positive terminal of each LED string, and the gate of the first MOSFET is connected to the drain of the second MOSFET via the third resistor; the fourth resistor is connected in parallel between the source and gate of the first MOSFET.

[0013] The source of the second MOSFET is connected to ground, and the gate of the second MOSFET and the output terminal of the sensing control module are connected between the first resistor and the second resistor.

[0014] Optionally, the mode selection module includes: a second single-pole double-throw switch, a third MOSFET, a fourth MOSFET, a fifth resistor, a sixth resistor, and a seventh resistor;

[0015] The stationary contact of the second single-pole double-throw switch is connected to the external power supply and the source of the third MOSFET respectively. The first moving contact of the second single-pole double-throw switch is connected to the input terminal of the sensing control module. The second moving contact of the second single-pole double-throw switch is connected to the positive terminal of each LED string respectively.

[0016] The drain of the third MOSFET is connected to the second moving contact of the second single-pole double-throw switch, and the gate of the third MOSFET is connected to the drain of the fourth MOSFET via the fifth resistor; the sixth resistor is connected in parallel between the source and gate of the third MOSFET.

[0017] The source of the fourth MOSFET is connected to ground, and the gate of the fourth MOSFET is connected to the output of the sensing control module; the seventh resistor is connected in parallel between the source and gate of the fourth MOSFET.

[0018] Optionally, the zero-code constant current control module includes: an input interface and a zero-code constant current driver chip;

[0019] The first input terminal of the zero-code constant current driver chip is connected to an external power supply via the first input terminal of the input interface; the second input terminal of the zero-code constant current driver chip is connected to an external control terminal via the second terminal of the input interface; and the third input terminal of the zero-code constant current driver chip is connected to ground via the third terminal of the input interface. Each output terminal of the zero-code constant current driver chip is connected to the negative terminal of the corresponding LED string.

[0020] Optionally, the sensing control module includes: a first voltage conversion module, an infrared sensing module, and a control module;

[0021] The input terminal of the first voltage conversion module is connected to the mode selection module, the output terminal of the first voltage conversion module is connected to the power supply terminal of the infrared sensing module and the power supply terminal of the control module, the output terminal of the infrared sensing module is connected to the input terminal of the control module, and the output terminal of the control module is connected to the mode selection module.

[0022] The first voltage conversion module is used to convert the output voltage of the external power supply into the power supply voltage of the infrared sensing module and the control module;

[0023] Infrared sensing module, used to detect external objects and generate infrared sensing signals;

[0024] The control module is used to generate a second LED string control signal based on the infrared sensing signal, and to control the lighting or turning off of each LED string based on the second LED string control signal.

[0025] Optionally, the sensing control module may also include: a first diode and a second diode;

[0026] The first diode is disposed between the input terminal of the first voltage conversion module and the mode selection module. The positive terminal of the first diode is connected to the mode selection module, and the negative terminal of the first diode is connected to the input terminal of the first voltage conversion module.

[0027] The second diode is positioned between the output of the control module and the mode selection module. The positive terminal of the second diode is connected to the output of the control module, and the negative terminal of the second diode is connected to the mode selection module.

[0028] Optionally, the infrared sensing module includes: a second voltage conversion module and a passive infrared sensor;

[0029] The input terminal of the second voltage conversion module is connected to the output terminal of the first voltage conversion module, the output terminal of the second voltage conversion module is connected to the power supply terminal of the passive infrared sensor, and the output terminal of the passive infrared sensor is connected to the input terminal of the control module.

[0030] Optionally, the infrared sensing module includes: an active infrared detection circuit;

[0031] The active infrared detection circuit includes: a first transistor, a second transistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an infrared emitting diode, and an infrared receiving transistor;

[0032] The output of the first voltage conversion module is connected to the positive terminal of the infrared emitting diode via the eighth and ninth resistors in sequence. The negative terminal of the infrared emitting diode is connected to the collector of the first transistor. The emitter of the first transistor is connected to ground, and the base of the first transistor is connected to the output of the control module via the tenth resistor. The positive terminal of the first capacitor is connected between the eighth and ninth resistors, and the negative terminal of the first capacitor is connected to ground.

[0033] The first end of the eleventh resistor is connected to the output of the first voltage conversion module, and the second end of the eleventh resistor is connected to the collector of the infrared receiving transistor; the emitter of the infrared receiving transistor is connected to ground; the first end of the twelfth resistor is connected to the first end of the eleventh resistor, and the second end of the twelfth resistor is connected to ground via the thirteenth resistor.

[0034] The first terminal of the second capacitor is connected to the second terminal of the eleventh resistor and the first terminal of the third capacitor, respectively. The second terminal of the second capacitor is connected to the second terminal of the twelfth resistor. The second terminal of the third capacitor is connected to ground.

[0035] The emitter of the second transistor is connected to the first end of the eleventh resistor, and the collector of the second transistor is connected to ground through the fourteenth resistor; the collector of the second transistor is also connected to the input terminal of the control module; the fourth capacitor is connected in parallel with the fourteenth resistor.

[0036] Optionally, the first voltage conversion module includes: a first voltage conversion chip, at least one input filter capacitor, and at least one output filter capacitor;

[0037] The input terminal of the first voltage conversion chip is connected to the mode selection module, and the output terminal of the first voltage conversion chip is connected to the power supply terminal of the infrared sensing module and the power supply terminal of the control module. The ground terminal of the first voltage conversion chip is connected to ground. Each input filter capacitor is connected in parallel between the input terminal of the first voltage conversion chip and ground, and each output filter capacitor is connected in parallel between the output terminal of the first voltage conversion chip and ground.

[0038] On the other hand, this utility model embodiment provides an intelligent lighting fixture, including: a control terminal, multiple LED light strings, and the aforementioned multi-mode LED control circuit;

[0039] The input terminal of the multi-mode LED control circuit is connected to the control terminal, and the multi-mode LED control circuit is connected to the positive and negative terminals of multiple LED light strings respectively.

[0040] The beneficial effects of this utility model embodiment are as follows:

[0041] In this embodiment of the invention, during the switching process of connecting the positive terminals of each LED string to the sensing control module, or connecting the positive terminals of each LED string to the external power supply, the zero-code constant current control module remains operational. Continuous power supply maintains the operational state of the zero-code constant current control module, ensuring that all control signals in the zero-code constant current control module remain in a hot-backup state during mode switching. When the sensing control module is disconnected and the zero-code constant current control module is switched to control the LED strings, the LED strings can immediately return to their pre-switch state. This completely avoids the problem of chaotic LED color control when switching from other control modes back to zero-code control in traditional solutions, improving the operational reliability of the LED control device and ensuring a good user experience for end users. Furthermore, the combination of the zero-code constant current control module and the sensing control module ensures both automatic response to basic lighting and retains real-time adjustment capabilities.

[0042] Other features and advantages of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0044] Figure 1This is a schematic diagram of the first circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of the second circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of the third circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the fourth circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0048] Figure 5 This is a schematic diagram of the fifth circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0049] Figure 6 This is a schematic diagram of the sixth circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0050] Figure 7 This is a schematic diagram of the seventh circuit structure of the multi-mode LED control circuit in this embodiment of the present invention;

[0051] Figure 8 This is a schematic diagram of the eighth circuit structure of the multi-mode LED control circuit in this utility model embodiment;

[0052] Figure 9 This is a schematic diagram of the ninth circuit structure of the multi-mode LED control circuit in this utility model embodiment;

[0053] Figure 10 This is a schematic diagram of the circuit structure of the intelligent lamp in an embodiment of this utility model.

[0054] Icons: 100 - Multi-mode LED control circuit; 110 - Zero-code constant current control module; 120 - Induction control module; 130 - Mode selection module; S1 - First single-pole double-throw switch; Q1 - First MOSFET; Q2 - Second MOSFET; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; S2 - Second single-pole double-throw switch; Q3 - Third MOSFET; Q4 - Fourth MOSFET; R5 - Fifth resistor; R6 - Sixth resistor; R7 - Seventh resistor; 111 - Input interface; 112 - Zero-code constant current driver chip; 121 - First voltage conversion module; 122 - Infrared sensing module; 123 - Control module; D1 - First diode; D2 - Second diode; 124-Second voltage conversion module; 125-Passive infrared sensor; 126-Active infrared detection circuit; P1-First transistor; P2-Second transistor; C1-First capacitor; C2-Second capacitor; C3-Third capacitor; C4-Fourth capacitor; R8-Eighth resistor; R9-Ninth resistor; R10-Tenth resistor; R11-Eleventh resistor; R12-Twelfth resistor; R13-Thirteenth resistor; R14-Fourteenth resistor; IR-Infrared emitting diode; PT-Infrared receiving transistor; 127-First voltage conversion chip; Ci-Input filter capacitor; Co-Output filter capacitor; 200-Smart lamp; 210-Control terminal; 220-LED light string. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0056] This utility model embodiment provides a multi-mode LED control circuit, see reference. Figure 1 As shown, the multi-mode LED control circuit 100 includes at least: a zero-code constant current control module 110, a sensing control module 120, and a mode selection module 130;

[0057] The input terminal of the zero-code constant current control module 110 is connected to the output terminal of the external control terminal, the power supply terminal of the zero-code constant current control module 110 is connected to the external power supply, and each output terminal of the zero-code constant current control module 110 is connected to the negative terminal of the corresponding LED string. The zero-code constant current control module 110 is used to receive the zero-code format control signal output by the external control terminal, generate the first LED string control signal according to the zero-code format control signal, and adjust the current of each LED string according to the first LED string control signal.

[0058] The first end of the mode selection module 130 is connected to the positive end of each LED string, the second end of the mode selection module 130 is connected to the sensing control module 120, and the third end of the mode selection module 130 is connected to an external power supply. The sensing control module 120 is used to detect external objects and generate a second LED string control signal, and control the lighting or turning off of each LED string according to the second LED string control signal.

[0059] The mode selection module 130 is used to connect the positive terminal of each LED string to the sensing control module 120, or to connect the positive terminal of each LED string to an external power supply.

[0060] exist Figure 1 In the multi-mode LED control circuit 100 shown, the mode selection module 130 can make each LED string work in two different working modes through internal on / off control.

[0061] The first working mode: The mode selection module 130 connects the positive terminal of each LED string to the external power supply. At this time, each LED string is directly powered by the external power supply and controlled by the zero-code constant current control module 110.

[0062] Specifically, after receiving the control signal in return-to-zero code format from the external control terminal, the return-to-zero code constant current control module 110 decodes the control signal according to a preset protocol to obtain the duty cycle parameters of each LED string. The preset protocol may be that the width or interval of continuous pulses corresponds to a specific duty cycle value, and specific pulse combinations may map to different commands. The return-to-zero code constant current control module 110 generates a first LED string control signal based on the decoded duty cycle parameters of each LED string. This first LED string control signal is a PWM signal that controls the duty cycle of the current flowing through each LED string. The function of the return-to-zero code constant current control module 110 can be implemented using a constant current driver chip that supports return-to-zero code communication. By using different duty cycles for the current of each LED string, dimming, color adjustment, lighting, and extinguishing of the LED strings can be achieved.

[0063] The second working mode: Connect the positive terminal of each LED string to the induction control module 120. At this time, the positive terminal of each LED string is connected to the induction control module 120, and the negative terminal of each LED string is connected to the output terminal of the zero-code constant current control module 110. Each LED string can be controlled simultaneously by the zero-code constant current control module 110 and the induction control module 120.

[0064] Specifically, in this control mode, the zero-code constant current control module 110 is continuously powered, and the induction control module 120 is also turned on. Each LED string can be controlled simultaneously by the zero-code constant current control module 110 and the induction control module 120, and the control of the two modules is parallel. The induction control module 120 detects whether there is an external object at a preset position. When an external object is present at the preset position, it generates a second LED string control signal to disconnect each LED string; when no external object is present at the preset position, it generates a second LED string control signal to turn each LED string on. The second LED string control signal controls the on or off of each LED string. The second LED string control signal is a PWM signal that controls the on or off of each LED string. At the same time, the user can also input a zero-code format control signal to the zero-code constant current control module 110 through an external control terminal to realize the dimming, color adjustment, brightness level adjustment, and extinguishing of the LED strings.

[0065] During the switching between the first and second control modes, the zero-code constant current control module 110 remains operational, and control signals in zero-code format sent by the external control terminal are continuously parsed and buffered in both modes. When switching from the second to the first mode, the zero-code constant current control module 110 maintains its original control signals. This application maintains the operational state of the zero-code constant current control module 110 through continuous power supply, ensuring that all control signals in the zero-code constant current control module 110 remain in a hot backup state during mode switching. When switching from the second to the first mode, the LED string can immediately restore its state before the switch, completely avoiding the problem of chaotic LED color control when LEDs switch from other control modes back to zero-code control in traditional solutions. Furthermore, the combination of the zero-code constant current control module 110 and the sensing control module 120 ensures both automatic response of basic lighting and real-time adjustment capability. Users can input control signals in zero-code format via the external control terminal for fine dimming at any time, forming a multi-mode dual-insurance control device that combines automatic sensing and manual adjustment.

[0066] In specific implementations, the multi-mode LED control circuit provided in this embodiment of the present invention has various structures to achieve its function, see reference. Figure 2 As shown, the mode selection module 130 includes: a first single-pole double-throw switch S1, a first MOSFET Q1, a second MOSFET Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4;

[0067] The stationary contact of the first single-pole double-throw switch S1 is connected to the external power supply and the source of the first MOSFET Q1 respectively. The first moving contact of the first single-pole double-throw switch S1 is connected to the input terminal of the sensing control module 120. The second moving contact of the first single-pole double-throw switch S1 is connected to ground in sequence through the first resistor R1 and the second resistor R2.

[0068] The drain of the first MOSFET Q1 is connected to the positive terminal of each LED string, and the gate of the first MOSFET Q1 is connected to the drain of the second MOSFET Q2 through the third resistor R3; the fourth resistor R4 is connected in parallel between the source and gate of the first MOSFET Q1.

[0069] The source of the second MOSFET Q2 is connected to ground, and the gate of the second MOSFET Q2 and the output terminal of the sensing control module 120 are connected between the first resistor R1 and the second resistor R2.

[0070] exist Figure 2 In the multi-mode LED control circuit 100 shown, when the stationary contact and the second moving contact of the first single-pole double-throw switch S1 are connected, the external power supply drives the second MOSFET Q2 to conduct through the voltage division of the first resistor R1 and the second resistor R2. After the second MOSFET Q2 conducts, the external power supply drives the first MOSFET Q1 to conduct through the voltage division of the third resistor R3 and the fourth resistor R4. The connection between the external power supply and the positive terminal of each LED string is connected, and the power supply circuit of each LED string is fully connected. At this time, each LED string is controlled by the zero-code constant current control module 110 connected to the negative terminal.

[0071] When the stationary contact and the first moving contact of the first single-pole double-throw switch S1 are connected, the external power supply powers the induction control module 120. The induction control module 120 detects external objects and generates a second LED string control signal. When the second LED string control signal is high, the second MOSFET Q2 is turned on, and the external power supply, through the voltage divider of the third resistor R3 and the fourth resistor R4, drives the first MOSFET Q1 to turn on. The connection between the external power supply and the positive terminal of each LED string is established, and each LED string is lit. When the second LED string control signal is low, the second MOSFET Q2 is turned off, the first MOSFET Q1 is turned off, the connection between the external power supply and the positive terminal of each LED string is disconnected, and each LED string is turned off. At the same time, when the second LED string control signal is high, each LED string can also be controlled by the zero-code constant current control module 110 connected to the negative terminal.

[0072] In specific implementations, the multi-mode LED control circuit provided in this embodiment of the present invention has various structures to achieve its function, see reference. Figure 3As shown, the mode selection module 130 includes: a second single-pole double-throw switch S2, a third MOSFET Q3, a fourth MOSFET Q4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor;

[0073] The stationary contact of the second single-pole double-throw switch S2 is connected to the external power supply and the source of the third MOSFET Q3 respectively. The first moving contact of the second single-pole double-throw switch S2 is connected to the input terminal of the sensing control module 120. The second moving contact of the second single-pole double-throw switch S2 is connected to the positive terminal of each LED string respectively.

[0074] The drain of the third MOSFET Q3 is connected to the second moving contact of the second single-pole double-throw switch S2. The gate of the third MOSFET Q3 is connected to the drain of the fourth MOSFET Q4 via the fifth resistor R5. The sixth resistor R6 is connected in parallel between the source and gate of the third MOSFET Q3.

[0075] The source of the fourth MOSFET Q4 is connected to ground, and the gate of the fourth MOSFET Q4 is connected to the output terminal of the sensing control module 120; the seventh resistor is connected in parallel between the source and gate of the fourth MOSFET Q4.

[0076] exist Figure 3 In the multi-mode LED control circuit 100 shown, when the stationary contact and the second moving contact of the second single-pole double-throw switch S2 are connected, the connection between the external power supply and the positive terminal of each LED string is directly connected, and the power supply circuit of each LED string is fully connected. At this time, each LED string is controlled by the zero-code constant current control module 110 connected to the negative terminal.

[0077] When the stationary contact of the second single-pole double-throw switch S2 is connected to the first moving contact, the external power supply powers the induction control module 120. The induction control module 120 detects external objects and generates a second LED string control signal. When the second LED string control signal is high, the fourth MOSFET Q4 is turned on, and the external power supply, through the voltage divider of the fifth resistor R5 and the sixth resistor R6, drives the third MOSFET Q3 to turn on. The connection between the external power supply and the positive terminal of each LED string is established, and each LED string is lit. When the second LED string control signal is low, the fourth MOSFET Q4 and the third MOSFET Q3 are turned off, and the connection between the external power supply and the positive terminal of each LED string is disconnected, and each LED string is turned off. At the same time, when the second LED string control signal is high, each LED string can also be controlled by the zero-code constant current control module 110 connected to the negative terminal.

[0078] In specific implementations, the multi-mode LED control circuit provided in this embodiment of the present invention has various structures for the zero-code constant current control module 110 to achieve its function, see reference. Figure 4As shown, the zero-code constant current control module 110 includes: an input interface 111 and a zero-code constant current driver chip 112;

[0079] The first input terminal of the zero-code constant current driver chip 112 is connected to an external power supply via the first input terminal of the input interface 111. The second input terminal of the zero-code constant current driver chip 112 is connected to an external control terminal via the second terminal of the input interface 111. The third input terminal of the zero-code constant current driver chip 112 is connected to ground via the third terminal of the input interface 111. Each output terminal of the zero-code constant current driver chip 112 is connected to the negative terminal of the corresponding LED string.

[0080] exist Figure 4 In the multi-mode LED control circuit 100 shown, the zero-code constant current driver chip 112 is connected to an external control terminal via a three-wire interface. The zero-code constant current driver chip 112 is connected to an external power supply via the first terminal of the input interface 111, supplying power to the zero-code constant current driver chip 112 and each LED string. The zero-code constant current driver chip 112 receives control signals in zero-code format output from the external control terminal via the second terminal of the input interface 111. The zero-code constant current driver chip 112 is grounded via the third terminal of the input interface 111 to form a complete loop, ensuring signal stability. Each output terminal of the zero-code constant current driver chip 112 is connected to the negative terminal of the LED string, facilitating independent control of multiple LEDs. The zero-code constant current driver chip 112 has a built-in decoding module that converts the received zero-code signal into digital instructions. For example, the continuous pulse width corresponds to the duty cycle value (e.g., 1ms pulse = 10% duty cycle), and a specific pulse combination (e.g., "high-low-high" three pulses) triggers a preset mode (e.g., color temperature switching). Based on the decoding results, the chip's internal clock generates PWM signals with corresponding duty cycles for each LED string as the control signal for the first LED string.

[0081] In specific implementations, the multi-mode LED control circuit provided in this embodiment of the present invention has various structures to achieve its function, see reference. Figure 5 As shown, the sensing control module 120 includes: a first voltage conversion module 121, an infrared sensing module 122, and a control module 123;

[0082] The input terminal of the first voltage conversion module 121 is connected to the mode selection module 130, the output terminal of the first voltage conversion module 121 is connected to the power supply terminal of the infrared sensing module 122 and the power supply terminal of the control module 123, the output terminal of the infrared sensing module 122 is connected to the input terminal of the control module 123, and the output terminal of the control module 123 is connected to the mode selection module 130.

[0083] The first voltage conversion module 121 is used to convert the output voltage of the external power supply into the power supply voltage of the infrared sensing module 122 and the control module 123.

[0084] Infrared sensing module 122 is used to detect external objects and generate infrared sensing signals;

[0085] The control module 123 is used to generate a second LED string control signal based on the infrared sensing signal, and to control the lighting or turning off of each LED string based on the second LED string control signal.

[0086] exist Figure 5 In the multi-mode LED control circuit 100 shown, the external power supply is generally 24V DC, and the power supply voltage of the infrared sensing module 122 and the control module 123 is generally 5V. To power the infrared sensing module 122 and the control module 123, the first voltage conversion module 121 is mainly used to reduce the output voltage of the external power supply to the power supply voltage of the infrared sensing module 122 and the control module 123, and then provide the reduced voltage to the infrared sensing module 122 and the control module 123. The first voltage conversion module 121 can be a step-down converter or a step-down chip. The infrared sensing module 122 can be used to detect external objects and generate a second LED string control signal, controlling the lighting or extinguishing of each LED string according to the second LED string control signal. The infrared sensing module 122 can be a data acquisition circuit composed of an active infrared sensor and a passive infrared sensor 125. The infrared sensing module 122 can detect in real time whether there is an external object at a preset position and generate a corresponding infrared sensing signal. The control module 123 can be an MCU (Microcontroller Unit). The control module 123 generates a corresponding second LED string control signal based on the level of the infrared sensing signal. When the level of the infrared sensing signal indicates that there is an external object at the preset position, a low-level second LED string control signal is generated; when the level of the infrared sensing signal indicates that there is no external object at the preset position, a high-level second LED string control signal is generated. When the second LED string control signal is high, the LED string is controlled to light up; when the second LED string control signal is low, the LED string is controlled to turn off.

[0087] In one possible implementation, see [reference] Figure 6 As shown, the sensing control module 120 also includes: a first diode D1 and a second diode D2;

[0088] The first diode D1 is disposed between the input terminal of the first voltage conversion module 121 and the mode selection module 130. The positive terminal of the first diode D1 is connected to the mode selection module 130, and the negative terminal of the first diode D1 is connected to the input terminal of the first voltage conversion module 121.

[0089] The second diode D2 is positioned between the output terminal of the control module 123 and the mode selection module 130. The positive terminal of the second diode D2 is connected to the output terminal of the control module 123, and the negative terminal of the second diode D2 is connected to the mode selection module 130.

[0090] exist Figure 6 In the multi-mode LED control circuit 100 shown, the first diode D1 is used to protect the first voltage conversion module 121, preventing the first voltage conversion module 121 from being burned out by the external power supply being connected in reverse. The second diode D2 is used to protect the control module 123, preventing the external power supply from flowing back through the voltage of the first resistor R1 and the second resistor R2.

[0091] In one possible implementation, see [reference] Figure 7 As shown, the infrared sensing module 122 includes: a second voltage conversion module 124 and a passive infrared sensor 125;

[0092] The input terminal of the second voltage conversion module 124 is connected to the output terminal of the first voltage conversion module 121, the output terminal of the second voltage conversion module 124 is connected to the power supply terminal of the passive infrared sensor 125, and the output terminal of the passive infrared sensor 125 is connected to the input terminal of the control module 123.

[0093] exist Figure 7 In the multi-mode LED control circuit 100 shown, the passive infrared sensor 125 typically has a power supply voltage of 3.3V, and the output voltage of the first voltage conversion module 121 is typically 5V. To power the passive infrared sensor 125, the second voltage conversion module 124 primarily reduces the output voltage of the passive infrared sensor 125 to its power supply voltage and provides the reduced voltage to the passive infrared sensor 125. The second voltage conversion module 124 can be a step-down converter or a step-down chip. When the passive infrared sensor 125 senses an external object at a preset location, it outputs a high-level infrared sensing signal. The control module 123 outputs a low-level second LED string control signal, controlling the second MOSFET Q2 or the fourth MOSFET Q4 to turn off, thereby controlling the LED strings to turn off. When the passive infrared sensor 125 senses no external object at a preset location, it outputs a high-level infrared sensing signal. The control module 123 outputs a low-level second LED string control signal, controlling the second MOSFET Q2 or the fourth MOSFET Q4 to turn on, thereby controlling the LED strings to light up.

[0094] In one possible implementation, see [reference] Figure 8 As shown, the infrared sensing module 122 includes: an active infrared detection circuit 126;

[0095] The active infrared detection circuit 126 includes: a first transistor P1, a second transistor P2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, an infrared emitting diode IR, and an infrared receiving transistor PT;

[0096] The output terminal of the first voltage conversion module 121 is connected to the positive terminal of the infrared emitting diode IR via the eighth resistor R8 and the ninth resistor R9 in sequence. The negative terminal of the infrared emitting diode IR is connected to the collector of the first transistor P1. The emitter of the first transistor P1 is connected to ground. The base of the first transistor P1 is connected to the input terminal of the control module 123 via the tenth resistor R10. The positive terminal of the first capacitor C1 is connected between the eighth resistor R8 and the ninth resistor R9. The negative terminal of the first capacitor C1 is connected to ground.

[0097] The first end of the eleventh resistor R11 is connected to the output end of the first voltage conversion module 121, and the second end of the eleventh resistor R11 is connected to the collector of the infrared receiving transistor PT; the emitter of the infrared receiving transistor PT is connected to ground; the first end of the twelfth resistor R12 is connected to the first end of the eleventh resistor R11, and the second end of the twelfth resistor R12 is connected to ground via the thirteenth resistor R13.

[0098] The first terminal of the second capacitor C2 is connected to the second terminal of the eleventh resistor R11 and the first terminal of the third capacitor C3, respectively. The second terminal of the second capacitor C2 is connected to the second terminal of the twelfth resistor R12. The second terminal of the third capacitor C3 is connected to ground.

[0099] The emitter of the second transistor P2 is connected to the first end of the eleventh resistor R11, and the collector of the second transistor P2 is connected to ground through the fourteenth resistor R14; the collector of the second transistor P2 is also connected to the input terminal of the control module 123; the fourth capacitor C4 is connected in parallel with the fourteenth resistor R14.

[0100] exist Figure 8 In the multi-mode LED control circuit 100 shown, the control module 123 drives the first transistor P1 according to a preset PWM signal. When the first transistor P1 is turned on, the infrared emitting diode IR is lit. The operating mode of the infrared emitting diode IR and the infrared receiving transistor PT is related to their respective settings. Specifically, it can be divided into the following two cases.

[0101] The first scenario: The infrared emitting diode IR and the infrared receiving transistor PT are set opposite each other, and the LED string is used as a night-time sensor light. When there is an external object in the preset position, the LED string is lit; when there is no external object in the preset position, the LED string is turned off.

[0102] When an object obstructs the path between the infrared emitting diode IR and the infrared receiving transistor PT, corresponding to the presence of an external object at a preset position, the infrared receiving transistor PT cannot be turned on. The voltage output by the first voltage conversion module 121, divided by the twelfth resistor R12 and the thirteenth resistor R13, is insufficient to turn on the second transistor P2. The infrared sensing signal output by the active infrared detection circuit 126 is low-level, and the control module 123 outputs a high-level second LED string control signal, controlling the second MOSFET Q2 or the fourth MOSFET Q4 to turn on, thereby controlling the lighting of each LED string. When no object obstructs the path between the infrared emitting diode IR and the infrared receiving transistor PT, corresponding to the absence of an external object at the preset position, the infrared receiving transistor PT is turned on, the second transistor P2 is turned on, the infrared sensing signal output by the active infrared detection circuit 126 is high-level, and the control module 123 outputs a low-level second LED string control signal, controlling the second MOSFET Q2 or the fourth MOSFET Q4 to turn off, thereby controlling the extinguishing of each LED string.

[0103] The second scenario: The infrared emitting diode (IR) and the infrared receiving transistor (PT) are located on the same side. The LED string is used as a sensor light inside the cabinet. When an external object is present at the preset position (corresponding to the cabinet door being closed), the LED string is turned off; when no external object is present at the preset position (corresponding to the cabinet door being open), the LED string is turned on.

[0104] The signal emitted by the infrared emitting diode IR is reflected by an obstruction within a preset range to the infrared receiving transistor PT. When an external object is present at the preset location, the infrared receiving transistor PT is turned on, and the second transistor P2 is also turned on. The infrared sensing signal output by the active infrared detection circuit 126 is high-level, and the control module 123 outputs a low-level second LED string control signal to turn off either the second MOSFET Q2 or the fourth MOSFET Q4, thus controlling the LED strings to turn off. If the infrared receiving transistor PT cannot receive the signal emitted by the reflected infrared emitting diode IR, and no external object is present at the preset location, the infrared receiving transistor PT cannot be turned on. The voltage output by the first voltage conversion module 121 is divided by the twelfth resistor R12 and the thirteenth resistor R13, which is insufficient to turn on the second transistor P2. The infrared sensing signal output by the active infrared detection circuit 126 is low-level, and the control module 123 outputs a high-level second LED string control signal to turn on either the second MOSFET Q2 or the fourth MOSFET Q4, thus controlling the LED strings to light up.

[0105] In one possible implementation, see [reference] Figure 9 As shown, the first voltage conversion module 121 includes: a first voltage conversion chip 127, at least one input filter capacitor Ci, and at least one output filter capacitor Co;

[0106] The input terminal of the first voltage conversion chip 127 is connected to the mode selection module 130, and the output terminal of the first voltage conversion chip 127 is connected to the power supply terminal of the infrared sensing module 122 and the power supply terminal of the control module 123. The ground terminal of the first voltage conversion chip 127 is connected to ground. Each input filter capacitor Ci is connected in parallel between the input terminal of the first voltage conversion chip 127 and ground, and each output filter capacitor Co is connected in parallel between the output terminal of the first voltage conversion chip 127 and ground.

[0107] exist Figure 9 In the multi-mode LED control circuit 100 shown, the first voltage conversion chip 127 is used to reduce the output voltage of the external power supply to the power supply voltage of the infrared sensing module 122 and the control module 123. The input filter capacitor Ci is used to filter out voltage fluctuations from the external power supply input and reduce external input noise interference. The output filter capacitor Co is used to smooth the output voltage of the first voltage conversion chip 127 and reduce voltage fluctuations caused by the infrared sensing module 122 and the control module 123.

[0108] Based on the same concept, this utility model embodiment also provides an intelligent lamp 200, see reference. Figure 10 As shown, the intelligent lighting fixture 200 includes at least: a control terminal 210, multiple LED light strings 220, and the aforementioned multi-mode LED control circuit 100;

[0109] The input terminal of the multi-mode LED control circuit 100 is connected to the control terminal 210, and the multi-mode LED control circuit 100 is connected to the positive and negative terminals of multiple LED light strings 220 respectively.

[0110] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0111] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of the embodiments of this utility model. Therefore, if these modifications and variations to the embodiments of this utility model fall within the scope of the claims of this utility model and their equivalents, then this utility model also intends to include these modifications and variations.

Claims

1. A multi-mode LED control circuit, characterized in that, include: Zero-code constant current control module, induction control module, and mode selection module; The input terminal of the zero-code constant current control module is connected to the output terminal of the external control terminal, the power supply terminal of the zero-code constant current control module is connected to an external power supply, and each output terminal of the zero-code constant current control module is connected to the negative terminal of the corresponding LED string. The zero-code constant current control module is used to receive the zero-code format control signal output by the external control terminal, generate a first LED string control signal according to the zero-code format control signal, and adjust the current of each LED string according to the first LED string control signal. The first end of the mode selection module is connected to the positive end of each LED string, the second end of the mode selection module is connected to the sensing control module, and the third end of the mode selection module is connected to the external power supply; the sensing control module is used to detect external objects and generate a second LED string control signal, and control the lighting or turning off of each LED string according to the second LED string control signal. The mode selection module is used to connect the positive terminal of each LED string to the sensing control module, or to connect the positive terminal of each LED string to the external power supply.

2. The multi-mode LED control circuit according to claim 1, characterized in that, The mode selection module includes: a first single-pole double-throw switch, a first MOSFET, a second MOSFET, a first resistor, a second resistor, a third resistor, and a fourth resistor; The stationary contact of the first single-pole double-throw switch is connected to the external power supply and the source of the first MOS transistor, respectively. The first moving contact of the first single-pole double-throw switch is connected to the input terminal of the sensing control module. The second moving contact of the first single-pole double-throw switch is connected to ground in sequence through the first resistor and the second resistor. The drain of the first MOS transistor is connected to the positive terminal of each of the LED strings, and the gate of the first MOS transistor is connected to the drain of the second MOS transistor via the third resistor; the fourth resistor is connected in parallel between the source and gate of the first MOS transistor. The source of the second MOS transistor is connected to ground, and the gate of the second MOS transistor and the output terminal of the sensing control module are connected between the first resistor and the second resistor.

3. The multi-mode LED control circuit according to claim 2, characterized in that, The mode selection module includes: a second single-pole double-throw switch, a third MOSFET, a fourth MOSFET, a fifth resistor, a sixth resistor, and a seventh resistor; The stationary contact of the second single-pole double-throw switch is connected to the external power supply and the source of the third MOS transistor, respectively. The first moving contact of the second single-pole double-throw switch is connected to the input terminal of the sensing control module, and the second moving contact of the second single-pole double-throw switch is connected to the positive terminal of each LED string. The drain of the third MOS transistor is connected to the second moving contact of the second single-pole double-throw switch, and the gate of the third MOS transistor is connected to the drain of the fourth MOS transistor via the fifth resistor; the sixth resistor is connected in parallel between the source and gate of the third MOS transistor. The source of the fourth MOS transistor is connected to ground, and the gate of the fourth MOS transistor is connected to the output terminal of the sensing control module; the seventh resistor is connected in parallel between the source and gate of the fourth MOS transistor.

4. The multi-mode LED control circuit according to any one of claims 1-3, characterized in that, The zero-code constant current control module includes: an input interface and a zero-code constant current driver chip; The first input terminal of the zero-code constant current driver chip is connected to the external power supply via the first input terminal of the input interface; the second input terminal of the zero-code constant current driver chip is connected to the external control terminal via the second terminal of the input interface; the third input terminal of the zero-code constant current driver chip is connected to ground via the third terminal of the input interface; and each output terminal of the zero-code constant current driver chip is connected to the negative terminal of the corresponding LED string.

5. The multi-mode LED control circuit according to claim 4, characterized in that, The sensing control module includes: a first voltage conversion module, an infrared sensing module, and a control module; The input terminal of the first voltage conversion module is connected to the mode selection module, the output terminal of the first voltage conversion module is connected to the power supply terminal of the infrared sensing module and the power supply terminal of the control module, the output terminal of the infrared sensing module is connected to the input terminal of the control module, and the output terminal of the control module is connected to the mode selection module. The first voltage conversion module is used to convert the output voltage of the external power supply into the power supply voltage of the infrared sensing module and the control module; The infrared sensing module is used to detect external objects and generate infrared sensing signals; The control module is used to generate a second light string control signal based on the infrared sensing signal, and to control the lighting or extinguishing of each LED light string based on the second light string control signal.

6. The multi-mode LED control circuit according to claim 5, characterized in that, The sensing control module further includes: a first diode and a second diode; The first diode is disposed between the input terminal of the first voltage conversion module and the mode selection module, with the anode of the first diode connected to the mode selection module and the cathode of the first diode connected to the input terminal of the first voltage conversion module. The second diode is disposed between the output terminal of the control module and the mode selection module. The positive terminal of the second diode is connected to the output terminal of the control module, and the negative terminal of the second diode is connected to the mode selection module.

7. The multi-mode LED control circuit according to claim 5, characterized in that, The infrared sensing module includes: a second voltage conversion module and a passive infrared sensor; The input terminal of the second voltage conversion module is connected to the output terminal of the first voltage conversion module, the output terminal of the second voltage conversion module is connected to the power supply terminal of the passive infrared sensor, and the output terminal of the passive infrared sensor is connected to the input terminal of the control module.

8. The multi-mode LED control circuit according to claim 5, characterized in that, The infrared sensing module includes: an active infrared detection circuit; The active infrared detection circuit includes: a first transistor, a second transistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, an infrared emitting diode, and an infrared receiving transistor. The output terminal of the first voltage conversion module is connected to the positive terminal of the infrared emitting diode via the eighth resistor and the ninth resistor in sequence. The negative terminal of the infrared emitting diode is connected to the collector of the first transistor. The emitter of the first transistor is connected to ground, and the base of the first transistor is connected to the output terminal of the control module via the tenth resistor. The positive terminal of the first capacitor is connected between the eighth resistor and the ninth resistor, and the negative terminal of the first capacitor is connected to ground. The first end of the eleventh resistor is connected to the output end of the first voltage conversion module, and the second end of the eleventh resistor is connected to the collector of the infrared receiving transistor; the emitter of the infrared receiving transistor is connected to ground; the first end of the twelfth resistor is connected to the first end of the eleventh resistor, and the second end of the twelfth resistor is connected to ground via the thirteenth resistor. The first terminal of the second capacitor is connected to the second terminal of the eleventh resistor and the first terminal of the third capacitor, respectively; the second terminal of the second capacitor is connected to the second terminal of the twelfth resistor; and the second terminal of the third capacitor is connected to ground. The emitter of the second transistor is connected to the first end of the eleventh resistor, and the collector of the second transistor is connected to ground through the fourteenth resistor; the collector of the second transistor is also connected to the input terminal of the control module; the fourth capacitor is connected in parallel with the fourteenth resistor.

9. The multi-mode LED control circuit according to claim 5, characterized in that, The first voltage conversion module includes: a first voltage conversion chip, at least one input filter capacitor, and at least one output filter capacitor; The input terminal of the first voltage conversion chip is connected to the mode selection module, and the output terminal of the first voltage conversion chip is connected to the power supply terminal of the infrared sensing module and the power supply terminal of the control module; the ground terminal of the first voltage conversion chip is connected to ground; each of the input filter capacitors is connected in parallel between the input terminal of the first voltage conversion chip and ground, and each of the output filter capacitors is connected in parallel between the output terminal of the first voltage conversion chip and ground.

10. A smart lighting fixture, characterized in that, include: A control terminal, multiple LED light strings, and a multi-mode LED control circuit as described in any one of claims 1-9; The input terminal of the multi-mode LED control circuit is connected to the control terminal, and the multi-mode LED control circuit is connected to the positive and negative terminals of the multiple LED light strings respectively.

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