Intelligent dimming circuit

Abstract

The utility model relates to LED light modulation technical field discloses a kind of intelligent light modulation circuit with lower static current loss and higher reliability, including the main control circuit (120) for outputting at least one control signal and a pulse signal, switching circuit (130) and constant-current circuit (140), wherein, when switching circuit (130) is controlled to be turned on, input current signal is loaded on load, to control load work, the duty cycle of the pulse signal of main control circuit (120) is adjusted by adjusting input constant-current circuit (140), to adjust the brightness of load.

Description

Technical Field

[0001] This utility model relates to the field of LED dimming technology, and more specifically, to an intelligent dimming circuit. Background Technology

[0002] With the continuous development of light-emitting diode (LED) lighting technology, the market demand for LED lighting devices is becoming increasingly strong. As one of the representative functions of dynamic control of LED lighting, the optimization and upgrading of dimming function has become a core element in the research and development of intelligent and healthy lighting technologies.

[0003] Most LED lights currently use lithium batteries for power, but they have a large current loss in standby mode, which causes the lithium battery to be consumed quickly. To keep the LED light working for a long time, the lithium battery needs to be charged repeatedly. This process may affect the lifespan of the lithium battery and also lead to a poor user experience.

[0004] Therefore, how to reduce static current loss in order to extend the service life of products has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by this utility model is that, in view of the above-mentioned defects of the prior art, the current loss during standby is large, which leads to the rapid consumption of lithium battery power. When maintaining LED lighting for a long time, the lithium battery needs to be repeatedly charged, which may affect the service life of the lithium battery. This utility model provides an intelligent dimming circuit with low static current loss and high reliability.

[0006] The technical solution adopted by this utility model to solve its technical problem is: to construct an intelligent dimming circuit, which has the following features:

[0007] The main control circuit, which is configured within the intelligent dimming circuit, is used to output at least one control signal and one pulse signal;

[0008] A switching circuit, whose power input and output terminals are connected, is used to receive current signals.

[0009] A signal input terminal of the switching circuit is connected to a signal output terminal of the main control circuit for receiving the control signal;

[0010] A constant current circuit, one input terminal of which is connected to the output terminal of the switching circuit, is used to receive the current signal.

[0011] One signal input terminal of the constant current circuit is connected to another signal output terminal of the main control circuit, and is used to receive the pulse signal;

[0012] When the switching circuit is turned on, the input current signal is applied to the load to control the operation of the load.

[0013] The main control circuit adjusts the brightness of the load by regulating the duty cycle of the pulse signal input to the constant current circuit.

[0014] In some embodiments, the switching circuit includes at least a tactile switch and a first MOSFET.

[0015] One end of the tactile switch is connected to the gate of the first MOS transistor via a sixth resistor.

[0016] The source of the first MOSFET is connected to the power input terminal to receive the current signal.

[0017] The drain of the first MOSFET is coupled to one input terminal of the constant current circuit.

[0018] The other end of the tactile switch is connected to the common terminal.

[0019] In some embodiments, the switching circuit further includes a second MOSFET and a switching diode.

[0020] One end of the switching diode is connected to a signal output terminal of the main control circuit through a seventh resistor, for receiving the control signal;

[0021] The gate of the second MOSFET is connected to the other end of the switching diode through an eighth resistor.

[0022] The drain of the second MOSFET is connected to one end of the tactile switch.

[0023] The source of the second MOSFET is connected to the common terminal.

[0024] In some embodiments, the switching circuit further includes a voltage divider module.

[0025] One end of the voltage divider module is connected to the drain of the first MOS transistor.

[0026] The other end of the voltage divider module is connected to a signal input terminal of the main control circuit.

[0027] In some embodiments, the voltage divider module includes a first resistor and a second resistor connected in series.

[0028] One end of the first resistor is connected to the drain of the first MOSFET.

[0029] The connection point between the first resistor and the second resistor is connected to a signal input terminal of the main control circuit.

[0030] In some embodiments, the main control circuit includes at least one main controller.

[0031] The power input terminal of the main controller is connected to the output terminal of the power supply circuit.

[0032] One signal output terminal of the main controller is connected to one end of the switching diode.

[0033] The other signal output terminal of the main controller is connected to one signal input terminal of the constant current circuit.

[0034] In some embodiments, the constant current circuit includes at least a constant current controller.

[0035] One input terminal of the constant current controller is connected to the drain of the first MOSFET to receive the current signal.

[0036] One signal input terminal of the constant current controller is connected to another signal output terminal of the main controller through a third resistor, for receiving the pulse signal.

[0037] In some embodiments, the power supply circuit includes at least a voltage regulator.

[0038] The input terminal of the voltage regulator is connected to the output terminal of the power supply via an eleventh resistor.

[0039] The output terminal of the voltage regulator is connected to the power input terminal of the main controller.

[0040] The intelligent dimming circuit described in this invention includes a main control circuit for outputting at least one control signal and one pulse signal, a switching circuit, and a constant current circuit. When the switching circuit is controlled to conduct, the input current signal is applied to the load to control its operation. The main control circuit adjusts the brightness of the load by regulating the duty cycle of the pulse signal input to the constant current circuit. Compared with existing technologies, the addition of a hardware startup function to the switching circuit reduces static current loss by eliminating current flow through subsequent circuits during standby, achieving zero current loss in standby. This effectively solves the problem of high current loss during standby, which leads to rapid lithium battery depletion and requires repeated charging of the lithium battery to maintain LED lighting operation for extended periods, potentially affecting battery lifespan. Attached Figure Description

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0042] Figure 1 This is a circuit schematic diagram of an embodiment of the power supply circuit and main control circuit provided by this utility model;

[0043] Figure 2 This is a circuit diagram of an embodiment of the switching circuit and constant current circuit provided by this utility model. Detailed Implementation

[0044] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0045] like Figure 1 and Figure 2 As shown, in the first embodiment of the intelligent dimming circuit of this utility model, the intelligent dimming circuit includes a power supply circuit 110, a main control circuit 120, a switching circuit 130, and a constant current circuit 140.

[0046] The power supply circuit 110 has the functions of filtering and voltage regulation. It is used to receive the input voltage signal, filter / regulate the input voltage signal, and output a +5V voltage signal to the subsequent circuit.

[0047] The main control circuit 120 has the functions of logic operation, signal reception / analysis and processing, output control signals and pulse signals;

[0048] Switching circuit 130 has the function of hardware start or soft start, and is used to control the output or off state of current signal;

[0049] The constant current circuit 140 is used to receive the pulse signal input from the main control circuit 120 and adjust the brightness of the load (corresponding to the LED light group) by changing the duty cycle of the pulse signal.

[0050] Specifically, the main control circuit 120 is configured within the intelligent dimming circuit to output at least one control signal and one pulse signal;

[0051] Furthermore, the power input terminal of the switching circuit 130 is connected to the power output terminal (corresponding to the VIN terminal) to receive the current signal. When the switching circuit 130 is controlled to be turned on, the current signal can be output to the constant current circuit 140 to control the load operation.

[0052] One signal input terminal of the switching circuit 130 is connected to one signal output terminal of the main control circuit 120, and is used to receive control signals.

[0053] When the input control signal is high, the switch circuit 130 is turned on.

[0054] When the input control signal is low, the switch circuit 130 is turned off.

[0055] Furthermore, one input terminal of the constant current circuit 140 is connected to the output terminal of the switching circuit 130 to receive the current signal output when the switching circuit 130 is controlled to be turned on.

[0056] One signal input terminal of the constant current circuit 140 is connected to another signal output terminal of the main control circuit 120 to receive pulse signals;

[0057] When the switching circuit 130 is turned on, the input current signal is applied to the load to control the load's operation.

[0058] The main control circuit 120 adjusts the brightness of the load by adjusting the duty cycle of the pulse signal input to the constant current circuit 140.

[0059] For example, as the pulse signal increases from a 1% duty cycle to a 100% duty cycle, the brightness of the LED lighting changes from dim to its brightest.

[0060] The process of the LED lighting brightness decreasing from its brightest to its darkest as the pulse signal decreases from 100% duty cycle to 1% duty cycle.

[0061] Using this technical solution, a hardware startup function is added to the switching circuit 130. No current flows through the subsequent circuit during standby, thereby reducing static current loss and achieving zero current loss during standby. This effectively solves the problem that the large current loss during standby leads to rapid depletion of the lithium battery. When maintaining LED lighting for a long time, the lithium battery needs to be repeatedly charged, which may affect the lifespan of the lithium battery.

[0062] In some implementations, such as Figure 2 As shown, to ensure the reliability of controlling the on / off state of the switching circuit 130, a tactile switch SW1 and a first MOSFET Q1 can be provided in the switching circuit 130.

[0063] Among them, the first MOSFET Q1 is selected as a P-channel enhancement-mode MOSFET, which has the function of switching;

[0064] Specifically, one end of the tactile switch SW1 is connected to the gate of the first MOSFET Q1 through the sixth resistor R6.

[0065] The source of the first MOSFET Q1 is connected to the power input terminal (corresponding to the VIN terminal) to receive the current signal.

[0066] The drain of the first MOSFET Q1 is coupled to one input terminal of the constant current circuit 140.

[0067] The other end of the tactile switch SW1 is connected to the common terminal.

[0068] When the tactile switch SW1 is turned on, the voltage of the gate of the first MOSFET Q1 is brought down to a low level, turning it on. The current signal is then output to the constant current circuit 140 via the SD of the first MOSFET Q1.

[0069] In some implementations, such as Figure 2 As shown, the switching circuit 130 also includes a second MOSFET Q2 and a switching diode D4.

[0070] Among them, the second MOSFET Q2 is selected as an N-channel enhancement-mode MOSFET, which has the function of switching;

[0071] Specifically, one end of the switching diode D4 is connected to a signal output terminal of the main control circuit 120 through the seventh resistor R7, and is used to receive the control signal output by the main control circuit 120;

[0072] The gate of the second MOSFET Q2 is connected to the other end of the switching diode D4 through the eighth resistor R8.

[0073] The drain of the second MOSFET Q2 is connected to one end of the tactile switch SW1.

[0074] The source of the second MOSFET Q2 is connected to the common terminal.

[0075] When the control signal input to the main control circuit 120 is high, the second MOSFET Q2 is turned on, which lowers the voltage of the gate of the first MOSFET Q1 to a low level, causing it to turn on. The current signal is then output to the constant current circuit 140 via the SD of the first MOSFET Q1.

[0076] In some implementations, such as Figure 2 As shown, to ensure the reliability of the battery assembly operation, a voltage divider module can be set in the switching circuit 130, which has the function of current sampling;

[0077] Specifically, one end of the voltage divider module is connected to the drain of the first MOSFET Q1, and is used to acquire the current signal output when the first MOSFET Q1 is controlled to be turned on.

[0078] The other end of the voltage divider module is connected to a signal input terminal of the main control circuit 120, and outputs the acquired current signal to the main control circuit 120. The main control circuit 120 can determine the battery pack's charge level based on the current signal.

[0079] Specifically, the voltage divider module includes a first resistor R1 and a second resistor R2 connected in series.

[0080] One end of the first resistor R1 is connected to the drain of the first MOSFET Q1.

[0081] The connection point of the first resistor R1 and the second resistor R2 is connected to a signal input terminal (corresponding to pin 2) of the main control circuit 120.

[0082] The acquired current signal is divided by the first resistor R1 and the second resistor R2 and then fed back to the main control circuit 120. When the voltage of the battery pack is lower than 3.0V, the LED Lighting is disabled and "B+" needs to be charged. When the voltage of "B+" is higher than 3.0V, the LED Lighting can be lit.

[0083] In some implementations, such as Figure 1 As shown, in order to improve the performance of the circuit, a main controller U102 can be set in the main control circuit 120, which has the functions of signal processing, output control signals and pulse signals;

[0084] Specifically, the power input terminal (corresponding to pin 1) of the main controller U102 is connected to the output terminal of the power supply circuit 110 to receive the +5V voltage output by the power supply circuit 110, thus enabling the trigger to operate.

[0085] One signal output terminal (corresponding to pin 7) of the main controller U102 is connected to one end of the switching diode D4 through the seventh resistor R7. The control signal output by the main controller U102 is input to the gate of the second MOSFET Q2 through the seventh resistor R7, the switching diode D4, and the eighth resistor R8.

[0086] Another signal output terminal (corresponding to pin 5) of the main controller U102 is connected to a signal input terminal of the constant current circuit 140 through the third resistor R3, outputting a pulse signal.

[0087] In some embodiments, the constant current circuit 140 includes at least a constant current controller U103.

[0088] One input terminal (pin 6) of the constant current controller U103 is connected to the drain of the first MOSFET Q1 to receive the current signal.

[0089] One signal input terminal (corresponding to pin 3) of the constant current controller U103 is connected to another signal output terminal (corresponding to pin 5) of the main controller U102 through the third resistor R3, and is used to receive the pulse signal output by the main controller U102.

[0090] In some implementations, such as Figure 1 As shown, the power supply circuit 110 includes at least a voltage regulator U101, which has the function of voltage regulation.

[0091] Specifically, the input terminal of the voltage regulator U101 is connected to the power output terminal (corresponding to the VIN terminal) through the eleventh resistor R11.

[0092] The output terminal (corresponding to the +5V terminal) of the voltage regulator U101 is connected to the power input terminal (corresponding to pin 1) of the main controller U102 to provide it with operating power.

[0093] The output terminal of the voltage regulator U101 (corresponding to the +5V terminal) is connected to a signal input terminal (corresponding to pin 3) of the constant current controller U103 through the fourth resistor R4.

[0094] Specifically, when the tactile switch SW1 is pressed, the first MOSFET Q1 is immediately turned on. This means that the voltage "B+" is connected to ground through the fifth resistor R5, the first diode D1, the sixth resistor R6, and the tactile switch SW1, causing the first MOSFET Q1 to turn on. The "B+" voltage is then supplied to the power supply terminal "VIN" via the drain and source connections of the first MOSFET Q1. At this time, the power supply circuit 110 is powered on and outputs a +5V voltage to the main controller U102.

[0095] At this time, the main controller U102 controls the second MOSFET Q2 to turn on, and the first MOSFET Q1 is turned on through "B+", the fifth resistor R5, the first diode D1, the sixth resistor R6, and the DS of the second MOSFET Q2 to ground, so that the first MOSFET Q1 continues to be turned on;

[0096] At this point, when the tactile switch SW1 is released, the dimming circuit is in the energized state.

[0097] The high-level control signal output by the "POWER_ON" of the main controller U102 is input to the gate of the second MOSFET Q2 through the seventh resistor R7, the fifth capacitor C5, the switching diode D4, the sixth capacitor C6, the eighth resistor R8, and the ninth resistor R9, controlling the second MOSFET Q2 to conduct. This prevents the main controller U102 from malfunctioning due to the instantaneous high / low level turning on the first MOSFET Q1, causing the LED Lighting to flash briefly and then turn off.

[0098] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A smart dimming circuit, characterized in that, have: The main control circuit, which is configured within the intelligent dimming circuit, is used to output at least one control signal and one pulse signal; A switching circuit, whose power input and output terminals are connected, is used to receive current signals. A signal input terminal of the switching circuit is connected to a signal output terminal of the main control circuit for receiving the control signal; A constant current circuit, one input terminal of which is connected to the output terminal of the switching circuit, is used to receive the current signal. One signal input terminal of the constant current circuit is connected to another signal output terminal of the main control circuit, and is used to receive the pulse signal; When the switching circuit is turned on, the input current signal is applied to the load to control the operation of the load. The main control circuit adjusts the brightness of the load by regulating the duty cycle of the pulse signal input to the constant current circuit.

2. The intelligent dimming circuit according to claim 1, characterized in that, The switching circuit includes at least a tactile switch and a first MOSFET. One end of the tactile switch is connected to the gate of the first MOS transistor via a sixth resistor. The source of the first MOSFET is connected to the power input terminal to receive the current signal. The drain of the first MOSFET is coupled to one input terminal of the constant current circuit. The other end of the tactile switch is connected to the common terminal.

3. The intelligent dimming circuit according to claim 2, characterized in that, The switching circuit also includes a second MOSFET and a switching diode. One end of the switching diode is connected to a signal output terminal of the main control circuit through a seventh resistor, for receiving the control signal; The gate of the second MOSFET is connected to the other end of the switching diode through an eighth resistor. The drain of the second MOSFET is connected to one end of the tactile switch. The source of the second MOSFET is connected to the common terminal.

4. The intelligent dimming circuit according to claim 3, characterized in that, The switching circuit also includes a voltage divider module. One end of the voltage divider module is connected to the drain of the first MOS transistor. The other end of the voltage divider module is connected to a signal input terminal of the main control circuit.

5. The intelligent dimming circuit according to claim 4, characterized in that, The voltage divider module includes a first resistor and a second resistor connected in series. One end of the first resistor is connected to the drain of the first MOSFET. The connection point between the first resistor and the second resistor is connected to a signal input terminal of the main control circuit.

6. The intelligent dimming circuit according to claim 5, characterized in that, The main control circuit includes at least one main controller. The power input terminal of the main controller is connected to the output terminal of the power supply circuit. One signal output terminal of the main controller is connected to one end of the switching diode. The other signal output terminal of the main controller is connected to one signal input terminal of the constant current circuit.

7. The intelligent dimming circuit according to claim 6, characterized in that, The constant current circuit includes at least a constant current controller. One input terminal of the constant current controller is connected to the drain of the first MOSFET to receive the current signal. One signal input terminal of the constant current controller is connected to another signal output terminal of the main controller through a third resistor, for receiving the pulse signal.

8. The intelligent dimming circuit according to claim 6, characterized in that, The power supply circuit includes at least a voltage regulator. The input terminal of the voltage regulator is connected to the output terminal of the power supply via an eleventh resistor. The output terminal of the voltage regulator is connected to the power input terminal of the main controller.

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