Intelligent dimming radar induction driving power supply control circuit

Abstract

The utility model discloses an intelligent dimming radar induction driving power supply control circuit. The circuit comprises an input voltage rectification module; the LED driving power supply output module is connected with the output end of the input voltage rectification module so as to obtain direct current to supply power to an LED load; the radar induction power supply module is used for providing stable working voltage for the radar induction module MK1; the intelligent dimming module comprises a radar sensing module MK1, a switching device, a resistor RS1 and a resistor RS2; the radar sensing module MK1 is used for sensing an external object approaching signal and is connected with the control end of the switching device to output an on-off signal to the switching device, and the switching device is connected with the resistor RS2 in series and then is connected with the resistor RS1 in parallel between the LED driving power supply output module and the ground. According to the scheme, through the design of a single group of light sources and a special topological circuit, only one group of switching devices and a parallel resistance network are needed, full-bright and micro-bright dimming of radar induction control is realized, the circuit structure is simplified, the cost is low, and the stability is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lighting drive, in particular to an intelligent dimming radar induction drive power supply control circuit. Background Art

[0002] Most of the smart radar-sensing LED lighting products on the market currently trigger full lighting when sensing an object approaching, and dim lighting when the object moves away. However, these products generally have complex structural topology circuits, and usually require two sets of circuits to output to two sets of light sources to achieve full lighting and dim lighting. This design not only increases product costs, but also due to the complex circuit structure and poor stability, it is prone to failure in actual applications, affecting the lighting effect and product life. Summary of the invention

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes an intelligent dimming radar induction drive power supply control circuit.

[0004] According to an embodiment of the utility model, an intelligent dimming radar sensing drive power control circuit includes: an input voltage rectifier module, which is used to convert alternating current into direct current; an LED drive power output module, which is connected to the output end of the input voltage rectifier module to obtain the direct current to power the LED load; a radar sensing power supply module, which is connected to the output end of the input voltage rectifier module to provide a stable working voltage for the radar sensing module MK1; an intelligent dimming module, which includes a radar sensing module MK1, a switching device, a resistor RS1 and a resistor RS2; the radar sensing module MK1 is used to sense an external object approaching signal, and is connected to the control end of the switching device to output an on-off signal to the switching device, and the switching device and the resistor RS2 are connected in series and then connected in parallel with the resistor RS1 between the LED drive power output module and the ground.

[0005] Furthermore, the input voltage rectification module includes a fuse F1, a rectifier bridge DB1, and a filter capacitor EC1; the AC input end is connected to one end of the fuse F1, the other end of the fuse F1 is connected to the input end of the rectifier bridge DB1, and the output end of the rectifier bridge DB1 is connected to the filter capacitor EC1, and DC power is output after being processed by the filter capacitor EC1.

[0006] Furthermore, the LED driving power supply output module includes a constant current chip U1, a freewheeling diode D1, and an energy storage inductor L1; the output end of the input voltage rectifier module is connected to the input end of the constant current chip U1, the output end of the constant current chip U1 is connected to one end of the energy storage inductor L1 and the anode of the freewheeling diode D1, the other end of the energy storage inductor L1 is connected to one end of the LED load, and the cathode of the freewheeling diode D1 is connected to the output end of the input voltage rectifier module; the resistor RS1 and the resistor RS2 are connected in parallel and connected between the current detection end of the constant current chip U1 and the ground.

[0007] Furthermore, a resistor R1 and a filter capacitor EC2 are connected in parallel between the cathode of the freewheeling diode D1 and the other end of the energy storage inductor L1.

[0008] Furthermore, the switch device is a MOS tube Q1, a source of the MOS tube Q1 is grounded, a drain is connected to the resistor RS2, and a gate is connected to the output end of the radar sensing module MK1.

[0009] Furthermore, a resistor R3 is connected between the source and drain of the MOS transistor Q1.

[0010] Furthermore, the radar sensing power supply module includes a step-down chip U2, a filter capacitor EC3 and an inductor L2; the output end of the input voltage rectifier module is connected to the input end of the step-down chip U2, the output end of the step-down chip U2 is respectively connected to the first end of the inductor L2 and one end of the filter capacitor EC3, the second end of the inductor L2 is respectively connected to the feedback end of the step-down chip U2 and the ground, the other end of the filter capacitor EC3 is grounded, and the connection point between the inductor L2 and the filter capacitor EC3 outputs 5V DC power to supply the radar sensing module MK1.

[0011] Furthermore, a freewheeling diode D2 is provided between the second end of the inductor L2 and the ground, and a reverse protection diode D3 is provided between the connection point between the inductor L2 and the filter capacitor EC3 and the output end of the buck chip U2.

[0012] Furthermore, a resistor R2 is provided between the feedback end of the buck chip U2 and the second end of the inductor L2.

[0013] Furthermore, the output end of the step-down chip U2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the second end of the inductor L2.

[0014] An intelligent dimming radar sensing drive power control circuit according to an embodiment of the utility model has at least the following beneficial effects: this solution uses a single group of light sources and a special topology circuit design, and only requires a group of switching devices and a parallel resistor network to achieve full-brightness and low-brightness dimming controlled by radar sensing, with a simplified circuit structure, low cost and improved stability; the radar signal directly switches the resistor through the switching device, with fast response and low power consumption, and is suitable for scenes such as basements and corridors, and is easy to install and maintain.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 It is a principle block diagram of an embodiment of the utility model;

[0018] Figure 2 The schematic diagram of the circuit of the embodiment of the utility model. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0020] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0022] refer to Figure 1 to Figure 2As shown, it is an intelligent dimming radar sensing drive power control circuit of the first embodiment of the present technical solution, including: an input voltage rectifier module 100, an LED drive power output module 200, a radar sensing power supply module 300, and an intelligent dimming module 400, wherein the input voltage rectifier module 100 is used to convert alternating current into direct current; the LED drive power output module 200 is connected to the output end of the input voltage rectifier module 100 to obtain direct current to power the LED load; the radar sensing power supply module 300 is connected to the output end of the input voltage rectifier module 100 to provide a stable working voltage for the radar sensing module MK1; the intelligent dimming module 400 includes a radar sensing module MK1, a switch device, a resistor RS1 and a resistor RS2; the radar sensing module MK1 is used to sense the approaching signal of an external object, and is connected to the control end of the switch device to output an on-off signal to the switch device, and the switch device and the resistor RS2 are connected in series and then connected in parallel with the resistor RS1 between the LED drive power output module 200 and the ground.

[0023] In this embodiment, the power supply is input to the input voltage rectifier module 100 through AC power, and the input voltage rectifier module 100 converts AC power into DC power. The DC power is respectively supplied to the LED driving power output module 200 and the radar sensing power supply module 300. After the radar sensing power supply module 300 is powered on, when the radar sensing power supply module 300 receives an external signal, it is transmitted to the switching device driving resistor RS2. After RS1 and RS2 are used in conjunction, they are controlled by the constant current chip U1 of the LED driving power output module 200, and the power output end outputs different currents to make the lamp produce different brightness.

[0024] like Figure 2 As shown, in some embodiments of the present scheme, the input voltage rectifier module 100 includes a fuse F1, a rectifier bridge DB1, and a filter capacitor EC1; the AC input end is connected to one end of the fuse F1, the other end of the fuse F1 is connected to the input end of the rectifier bridge DB1, the output end of the rectifier bridge DB1 is connected to the filter capacitor EC1, and DC power is output after being processed by the filter capacitor EC1; wherein the fuse F1 protects the circuit from overcurrent, the rectifier bridge DB1 converts the AC power into pulsating DC power, and EC1 filters and smoothes the DC voltage.

[0025] In some embodiments of the present invention, the LED driving power supply output module includes a constant current chip U1, a freewheeling diode D1, and an energy storage inductor L1; the output end of the input voltage rectifier module 100 is connected to the input end LED+ of the constant current chip U1, and the LED driving power supply output module 100 is connected to the input end LED+ of the constant current chip U1. Figure 2It can be seen that the input terminal LED+ of the constant current chip U1 is also the positive input terminal LED+ of the LED load. The output terminal SW of the constant current chip U1 is connected to one end of the energy storage inductor L1 and the anode of the freewheeling diode D1. The other end of the energy storage inductor L1 is connected to the negative input terminal LED- of the LED load. The cathode of the freewheeling diode D1 is connected to the output end of the input voltage rectifier module 100. The resistor RS1 and the resistor RS2 are connected in parallel and connected between the current detection terminal of the constant current chip U1 and the ground. Among them, the constant current chip U1 realizes constant current output through internal PWM control. The resistor RS1 is used as a reference resistor to set the basic current (slightly bright state). When RS2 is connected in parallel (Q1 is turned on), the equivalent resistance is reduced and the output current is increased (fully bright state). The freewheeling diode D1 and the energy storage inductor L1 form an energy storage circuit to maintain current continuity.

[0026] Furthermore, a resistor R1 and a filter capacitor EC2 are connected in parallel between the cathode of the freewheeling diode D1 and the other end of the energy storage inductor L1 to further smooth the pulsating direct current and reduce the ripple.

[0027] In some embodiments of the present scheme, the switch device is a MOS tube Q1, the source of the MOS tube Q1 is grounded, the drain is connected to the resistor RS2, and the gate is connected to the output end of the radar sensing module MK1. The MOS tube Q1 acts as a switch here. When the radar sensing module detects a moving object, a signal is output through the pin P1 to turn on Q1, thereby changing the resistor network, adjusting the output current of the constant current chip U1, and realizing brightness switching. It should be pointed out that the switch device in this embodiment is a MOS tube Q1, which is only one of the implementation methods, and other existing conventional switch devices can also be used to replace it to realize the switching function.

[0028] In addition, a resistor R3 is connected between the source and drain of the MOS tube Q1. The resistor R3 connected in parallel between the gate and source can release the gate charge of the MOS tube and protect the MOSFET from breakdown.

[0029] Since the voltage output by the input voltage rectifier module 100 is relatively high, it is not suitable for directly powering the radar sensing module MK1. In some embodiments of the present scheme, the radar sensing power supply module 300 includes a step-down chip U2, a filter capacitor EC3 and an inductor L2. The output end of the input voltage rectifier module 100 is connected to the input end of the step-down chip U2, and the output end of the step-down chip U2 is respectively connected to the first end of the inductor L2 and one end of the filter capacitor EC3. The second end of the inductor L2 is respectively connected to the feedback end of the step-down chip U2 and the ground. The other end of the filter capacitor EC3 is grounded. The connection point between the inductor L2 and the filter capacitor EC3 outputs 5V DC power to supply the radar sensing module MK1. Among them, the PWM controller inside the step-down chip U2 switches at a fixed frequency, adjusts the output voltage through the duty cycle, and steps down the high-voltage DC power to a stable 5V; the filter capacitor EC3 and the inductor L2 form an LC filter circuit to reduce ripple and provide a stable operating voltage for the radar sensing module MK1. Specifically, when the U2 switch tube is turned on, the current passes through L2 to store energy; when the switch tube is turned off, L2 releases energy to maintain current continuity, and EC3 stores charge to compensate for voltage fluctuations during transient changes in the load.

[0030] Furthermore, a freewheeling diode D2 is provided between the second end of the inductor L2 and the ground. When the switch tube inside the buck chip U2 is turned off, the current in the inductor L2 cannot change suddenly, and a reverse electromotive force will be generated. At this time, D2 can provide a freewheeling path for the inductor L2, so that the current in the inductor can continue to flow, avoiding the generation of excessively high voltage spikes, and protecting the buck chip U2 and other components from being damaged; a reverse protection diode D3 is provided between the connection point of the inductor L2 and the filter capacitor EC3 and the output end of the buck chip U2. D3 acts as a protection diode to prevent the reverse voltage from damaging the circuit; for example, when the radar sensing module or other loads generate a reverse voltage, D3 will be turned on, short-circuiting the reverse voltage to the ground, preventing the reverse voltage from affecting other parts of the power supply circuit, and protecting the buck chip U2 and other components.

[0031] Furthermore, a resistor R2 is arranged between the feedback end of the buck chip U2 and the second end of the inductor L2. The resistor R2 is connected in the feedback loop of the buck chip U2 and can perform voltage division. The buck chip U2 usually detects the output voltage through the feedback pin and adjusts the internal switch duty cycle according to the detection result to maintain a stable output voltage.

[0032] In addition, the output end of the buck chip U2 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the second end of the inductor L2. The buck chip U2 is on the output side, and it works together with the filter capacitor EC3 to further reduce the ripple of the output voltage. Since factors such as load changes may cause slight fluctuations in the output voltage, the capacitor C1 can quickly respond to these changes, replenish or absorb charges, and make the 5V DC output to the radar module more stable.

[0033] As described above, the complete working principle of this scheme is as follows: (1) The power supply is input to the input voltage rectifier module 100 through AC power, and the input voltage rectifier module 100 converts AC power into DC power, which is respectively supplied to the LED drive power output module 200 and the radar sensing power supply module 300; (2) After the radar sensing power supply module 300 is powered on, the step-down chip U2 works together with peripheral components to generate a stable low-ripple 5V DC power, and the 5V DC power is supplied to the radar sensing module MK1, and MK1 begins to enter the working standby state; (3) When the radar sensing module MK1 receives an external signal, the pin P1 will immediately output a signal to the MOS tube Q1. After Q1 receives the signal, it will turn on itself. After Q1 is turned on, the resistor RS2 will be turned on to the circuit ground GND, thereby working in parallel with the resistor RS1; after the resistors RS1 and RS2 are connected in parallel, the constant current chip U1 starts to work, and by cooperating with the freewheeling diode Tube D1 and energy storage inductor L1, the power output end will output a set of stable current I1. After the current I1 passes through the LED lamp bead, the lamp can be lit at full power; (4) If the radar sensing module MK1 does not receive an external signal, the pin P1 will not output a signal to the MOS tube Q1. If the MOS tube Q1 does not receive a signal, it will not be turned on and will be in a closed state. The resistor RS2 is equivalent to being disconnected and not connected to the circuit ground GND. At this time, the current output by the power supply is only regulated by the resistor RS1. The constant current chip U1 receives the signal from RS1 and still cooperates with the freewheeling diode D1 and the energy storage inductor L1. The power output end will output another set of stable current I2. After the current I2 passes through the LED lamp bead, the lamp can be slightly brightened. In this way, the power output currents I1 and I2 work separately, so that one set of light sources can produce two different lighting effects, making the entire product structure and circuit simpler and more stable.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An intelligent dimming radar induction drive power control circuit, characterized in that: include An input voltage rectifier module (100) for converting alternating current into direct current; An LED driving power supply output module (200) connected to the output end of the input voltage rectification module (100) to obtain the direct current to power the LED load; A radar sensing power supply module (300) connected to the output end of the input voltage rectification module (100) to provide a stable operating voltage for the radar sensing module MK1; An intelligent dimming module (400), the intelligent dimming module (400) comprising a radar sensing module MK1, a switch device, a resistor RS1 and a resistor RS2; the radar sensing module MK1 is used to sense an external object approaching signal and is connected to a control end of the switch device to output an on / off signal to the switch device; the switch device and the resistor RS2 are connected in series and then connected in parallel with the resistor RS1 between the LED drive power output module (200) and ground.

2. The intelligent dimming radar induction drive power control circuit according to claim 1, characterized in that: The input voltage rectification module (100) comprises a fuse F1, a rectifier bridge DB1, and a filter capacitor EC1; the AC input end is connected to one end of the fuse F1, the other end of the fuse F1 is connected to the input end of the rectifier bridge DB1, the output end of the rectifier bridge DB1 is connected to the filter capacitor EC1, and direct current is output after being processed by the filter capacitor EC1.

3. The intelligent dimming radar induction drive power control circuit according to claim 1, characterized in that: The LED driving power supply output module (200) comprises a constant current chip U1, a freewheeling diode D1, and an energy storage inductor L1; the output end of the input voltage rectification module (100) is connected to the input end of the constant current chip U1, the output end of the constant current chip U1 is connected to one end of the energy storage inductor L1 and the anode of the freewheeling diode D1, the other end of the energy storage inductor L1 is connected to one end of the LED load, and the cathode of the freewheeling diode D1 is connected to the output end of the input voltage rectification module (100); the resistor RS1 and the resistor RS2 are connected in parallel and connected between the current detection end of the constant current chip U1 and the ground.

4. The intelligent dimming radar induction drive power control circuit according to claim 3, characterized in that: A resistor R1 and a filter capacitor EC2 are connected in parallel between the cathode of the freewheeling diode D1 and the other end of the energy storage inductor L1.

5. The intelligent dimming radar induction drive power control circuit according to claim 1, 3 or 4, characterized in that: The switch device is a MOS tube Q1, a source of the MOS tube Q1 is grounded, a drain is connected to the resistor RS2, and a gate is connected to the output end of the radar sensing module MK1.

6. The intelligent dimming radar induction drive power control circuit according to claim 5, characterized in that: A resistor R3 is connected between the source and drain of the MOS transistor Q1.

7. The intelligent dimming radar induction drive power control circuit according to claim 1, characterized in that: The radar sensing power supply module (300) comprises a step-down chip U2, a filter capacitor EC3 and an inductor L2; the output end of the input voltage rectifier module (100) is connected to the input end of the step-down chip U2, the output end of the step-down chip U2 is respectively connected to the first end of the inductor L2 and one end of the filter capacitor EC3, the second end of the inductor L2 is respectively connected to the feedback end of the step-down chip U2 and the ground, the other end of the filter capacitor EC3 is grounded, and the connection point between the inductor L2 and the filter capacitor EC3 outputs 5V DC power to supply the radar sensing module MK1.

8. The intelligent dimming radar induction drive power control circuit according to claim 7, characterized in that: A freewheeling diode D2 is provided between the second end of the inductor L2 and the ground, and a reverse protection diode D3 is provided between the connection point of the inductor L2 and the filter capacitor EC3 and the output end of the buck chip U2.

9. The intelligent dimming radar induction drive power control circuit according to claim 7 or 8, characterized in that: A resistor R2 is provided between the feedback end of the buck chip U2 and the second end of the inductor L2.

10. The intelligent dimming radar induction drive power control circuit according to claim 9, characterized in that: The output end of the step-down chip U2 is connected to one end of the capacitor C1 , and the other end of the capacitor C1 is connected to the second end of the inductor L2 .

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