WO2012024978A1 - Led smart and dynamic control system, driving power source and control method - Google Patents

Abstract

The invention discloses an LED smart and dynamic control system and control method. The system includes: a central control unit, an adjustable constant-current unit which is connected to a load and the control-output port of the central control unit, a voltage and current detection unit which is connected to the control-input port of the central control unit. The method includes that: step SI, the control system is initialized, and the adjustable constant- current unit is configured to output the minimum current; step S2, the current outputted from the adjustable constant- current unit is increased gradually until the voltage across the load equals to the rated voltage; step S3, the output current value at the moment is locked by the control system; step S4, the control system detects the load and the change of the voltage and current of the load in real-time, and performs dynamic adjustment. Using microprocessor technique and real-time detection technique, the invention dynamically processes the load and change of the voltage and current value of the load, and automatically performs dynamic adjustment based on the change, such that the output current is constant, further the operation state of the load can be indicated by four LEDs.

Description

 LED intelligent dynamic control system, driving power source and control method

Technical field

 The invention relates to an LED intelligent dynamic control system and a control method thereof, in particular to an LED intelligent dynamic control system and a control method with load automatic matching and over-limit warning function.

Background technique

 The LED is L i ght Emi t t ing Diode , which is called a light-emitting diode in Chinese. LED has been widely used in the display field due to its inherent characteristics. High-power LED is a kind of high-brightness LED. Single high-power LED has higher power and brightness than low-power LED. Because LED itself has high brightness, low operating voltage, low power consumption, no pollution, small size. The outstanding advantages of long life, long life, impact resistance and stable performance have gradually led to the application of lighting systems, and will gradually replace the widely used incandescent lamps.

 However, an important factor limiting the use of LEDs for illumination is that they are more expensive. The price of several LEDs can be comparable to the price of an incandescent lamp. The price of high-power LEDs used in lighting fixtures is higher. The group of lamp heads usually includes dozens or even hundreds of LEDs. Therefore, it is more important to protect the LEDs of the LED lighting fixtures and extend the service life of the LEDs.

The key factor affecting the service life of LEDs lies in the power supply system. Most of the power supply systems of LEDs use constant current power supplies. Currently, LED constant current power supplies on the market are mostly fixed current outputs. The output current needs to be adjusted manually, sometimes due to artificial Misoperation will cause the current to exceed the limit and cause the LED life to drop sharply. Currently, the LED constant current power supply on the market cannot dynamically adjust the output current according to the load, nor can it be overvoltage, undervoltage, overcurrent, undercurrent, etc. The automatic matching adjustment in the case of over-limitation also affects the service life of the LED, and at the same time brings a lot of inconvenience to the installation of the LED. Invention

 The object of the present invention is: to provide an LED intelligent dynamic control system and a control method for the above problems, which can dynamically detect changes in load and load voltage and current, and dynamically output a constant current value to achieve protection. Extend the life of LED lamps.

 The object of the invention is achieved by the following technical solutions:

 An intelligent intelligent control system for LEDs, comprising a power supply unit, further comprising a central control unit, an adjustable constant current unit and a voltage and current detecting unit, an adjustable constant current unit, and a control output port and a load connection of the central control unit, and receiving central control The control of the unit outputs a constant current to the load; the voltage and current detecting unit is connected with the control input port of the central control unit, collects the load voltage and the load current parameter, and sends the collected load parameter to the central controller for processing; The central control unit is connected to the power supply unit, receives and processes the load voltage and current parameters collected by the voltage and current detecting unit, and controls the adjustable constant current unit to output a constant current to the load.

 The above central control unit includes a single chip microcomputer or any one of an FPGA and an ARM.

 The adjustable constant current unit comprises an integrated circuit LM3401, a MOSFET tube, a Schottky diode, a resistor R4 - R5, and a capacitor and an inductor; the first pin of the integrated circuit LM3401 is connected to the source of the MOSFET tube, and the third pin passes The fourth resistor R4 is connected to the control output port of the central control unit, the fourth pin is grounded through the resistor R5, the fifth pin is grounded, the sixth pin is connected to the gate of the MOSFET tube, and the seventh pin is connected The drain of the MOSFET is connected and grounded through a capacitor, and the eighth pin is connected to the drain of the MOSFET via a sixth resistor R6; the source of the MOSFET is connected to the load through an inductor; the cathode of the Schottky diode is The source of the M0SFET tube is connected and the anode is grounded.

 An LED intelligent dynamic control system further includes an alarm indicating unit connected to an output port of the central control unit for responding to an alarm message, the alarm indicating unit comprising four LED tubes.

 An LED intelligent dynamic control system further comprises a temperature and humidity detecting unit connected to an input port of a central control unit, detecting temperature and ambient humidity parameters of the dynamic control system and the load, and transmitting the parameters to the central control unit.

An intelligent dynamic control LED driving power source using the above LED intelligent dynamic control system. The constant current module outputs a minimum current; step S2, gradually increasing the output current of the adjustable constant current module to the rated voltage of the load; step S3, the control system locks the output current value at this time; step S4, the control system detects the load in real time And the load current voltage changes and is dynamically adjusted.

 The step S2 includes: Step S21, gradually increasing the output current of the adjustable constant current unit; Step S22, the voltage current detecting unit collects the voltage across the load; Step S23, determining whether the voltage across the load is the rated working voltage, if not Returning to step S21, otherwise proceeding to step S3. The rated operating voltage is 12V.

 The above step S4 includes the following steps: Step S41, the voltage current detecting unit collects the current of the load and the voltage across the load; Step S42, determines whether the current of the load and the voltage between the two ends exceed the limit, and if yes, an alarm indication, otherwise proceeding to the step: Step S43 , dynamically adjusting the current of the load and the voltage between the two ends; Step S44, dynamically detecting whether the load changes, if yes, returning to step S43, otherwise ending. The current overrun includes an undercurrent condition with a load current of less than 6.25A and an overcurrent condition of greater than 8.75A. The voltage overrun includes an undervoltage condition where the voltage across the load is less than 11V and an overvoltage condition greater than 13V.

 In summary, the present invention can achieve the following beneficial effects by using the above technical solutions:

1. The invention dynamically processes the voltage and current values of the load and the load through microprocessor technology and real-time detection technology, and automatically adjusts dynamically according to the change condition to make the output current constant;

 1. The invention comprises an alarm indicating unit consisting of four LED tubes, which can simply and intuitively display four over-limit states of over-current, under-current, over-voltage and under-voltage;

3. The invention comprises a temperature and humidity detecting unit, which can detect the working temperature and the environmental humidity, can reduce the load power when the temperature exceeds the limit, protect the load, prolong the service life of the load, and can interrupt the load work when the humidity exceeds the limit, so as to avoid the short circuit. Damage to the load and control system. DRAWINGS The invention will be illustrated by way of example and with reference to the accompanying drawings in which:

 1 is a schematic diagram of an LED intelligent dynamic control system of the present invention.

 2 is a circuit diagram of an adjustable constant current unit of the LED intelligent dynamic control system of the present invention.

 3 is a flow chart of the LED intelligent dynamic control method of the present invention.

 Figure 4 is a flow chart showing the step S2 in the LED intelligent dynamic control method of the present invention.

 Fig. 5 is a flow chart showing the step S4 in the LED intelligent dynamic control method of the present invention.

 Figure 6 is a schematic diagram of the intelligent dynamic control LED driving power supply of the present invention. detailed description

 All of the features disclosed in this specification, or steps in all methods or processes disclosed, in addition to mutually exclusive features and/or steps, may be combined in any manner.

 Any feature disclosed in this specification (including any additional claims, abstracts and drawings) may be replaced by other equivalents or alternative features, unless otherwise stated. That is, unless specifically stated, each feature is only one example of a series of equivalent or similar features.

As shown in FIG. 1 and FIG. 6, it is a schematic diagram of an LED intelligent dynamic control system and a driving power source thereof in the embodiment of the present invention. An LED intelligent dynamic control system includes a power supply unit, and further includes a central control unit, an adjustable constant current unit, and a voltage current detecting unit. The adjustable constant current unit is connected to the control output port of the central control unit and the load, and is controlled by the central control unit to the load (for example, the load may include 20 groups of LED units, each group of LED units including 3 LED strings Each group consumes 300 mA) to output a constant current; the voltage and current detecting unit is connected to the control input port of the central control unit, collects load voltage and load current parameters, and sends the collected load parameters to the central controller. The central control unit is connected to the power supply unit, receives and processes the load voltage and current parameters collected by the voltage and current detecting unit, and controls the adjustable constant current unit to output a constant current to the load, wherein the central control unit is a system The core part, to achieve a variety of logic control, including microcontroller or FPGA, ARM Any of the processors and their peripheral auxiliary circuits. The adjustable constant current unit described above, as shown in FIG. 2, comprises an integrated circuit LM3401 ( Ul ), a MOSFET tube Q1, a Schottky diode D1, resistors R4 R R5 and a capacitor C1, an inductor L1; the integrated circuit LM3401 ( The first pin SHDN of U1) is connected to the source of the MOSFET, the third pin SNS is connected to the control output port of the central control unit through the fourth resistor R4, and the fourth pin HYS is grounded through the resistor R5, the fifth pin GND is grounded, the sixth pin HG is connected to the gate of the MOSFET tube Q1, the seventh pin is connected to the drain of the MOSFET tube Q1 and grounded through the capacitor C1, and the eighth pin is passed through the sixth resistor R6 and the MOSFET tube Q1 The drain of the MOSFET tube Q1 is connected to the load through the inductor L1; the cathode of the Schottky diode D1 is connected to the source of the MOSFET tube Q1, and the anode is grounded. Advantageously, the invention further comprises an alarm indicating unit coupled to the central control unit output port for responding to the alarm message, the alarm indicating unit comprising four LED tubes. The alarm indicating unit is used to indicate an overrun working state of the load, and the overrun working state of the present invention mainly includes undervoltage (<11V), overvoltage (>1 3V), undercurrent (< 6.25A), overcurrent ( > 8. 75A ) Four states, these four working states with low price, long service life and environmentally friendly LED indicating load are simple and intuitive. Preferably, the present invention further includes a temperature and humidity detecting unit connected to the central control unit input port, detecting the temperature and ambient humidity parameters of the constant current control system and the load, and transmitting the parameters to the central control unit. The temperature and humidity detecting unit comprises a temperature sensor and a humidity sensor, and the temperature sensor is placed on the load and/or the control system for detecting the load during operation and/or controlling the temperature of the system. When the temperature is higher than the set temperature threshold, the control system The output current is automatically adjusted to reduce the heating power, and the service life of the load (LED lamp unit) is effectively protected. When the temperature is lower than the set temperature, the supply current returns to normal. In the present invention, the set temperature is WC, and the temperature is based on The situation is different; the humidity sensor is used to detect the humidity of the control system and/or the working environment of the load, and the ambient humidity is > 98 (here is just an example, those skilled in the art can understand that the environmental humidity conditions will change under different conditions. ), or when the control system and / or load into the water, the central control unit controls the automatic cut off power, to avoid the control system circuit and load from short circuit. An LED intelligent dynamic control method of the present invention, the flow chart of which is shown in FIG. 3, includes: Step S1, initializing a control system, and configuring an adjustable constant current module to output a minimum current; in an embodiment of the present invention, the constant current is adjustable The output current of the flow unit ranges from 2-10A, and the minimum current output is initially set to 2A.

 Step S2, gradually increasing the output current of the adjustable constant current module to the voltage across the load is a rated voltage; in one embodiment of the present invention, the load of 20 sets of three strings of LEDs is used, each group consuming 300 mA, so the embodiment of the present invention When the output current value is 6A, the voltage across the load is 12V, so the rated voltage at both ends of the load is set to 12V.

 Step S3, the control system locks the output current value at this time; the output current in one embodiment of the present invention is 6A.

 Step S4, the control system detects load and load current voltage changes in real time and performs dynamic adjustment. In the above step S2, the detailed flowchart thereof is as shown in FIG. 4, and includes the steps:

 Step S21, gradually increasing the output current of the adjustable constant current unit;

 Step S22, the voltage current detecting unit collects the voltage across the load;

 Step S23, determining whether the voltage across the load is a rated working voltage, if not, returning to the step

S21, otherwise proceed to step S3.

 In the above step S4, the detailed flowchart thereof is as shown in FIG. 5, and includes the steps:

 Step S41, the voltage and current detecting unit collects the current of the load and the voltage across the load;

 Step S42, determining whether the current of the load and the voltage at both ends are out of limits, and if yes, an alarm indication, otherwise the steps are as follows:

 Step S43, dynamically adjusting the current of the load and the voltage between the two ends;

In step S44, it is dynamically detected whether the load is changed, and if yes, the process returns to step S43, and otherwise ends. In the above step S42, the current overrun includes an undercurrent state in which the load current is less than 6.25A and an overcurrent state greater than 8.75A. In the above step S42, the voltage overrun includes an undervoltage state in which the voltage across the load is less than 11V and an overvoltage state greater than ¹³ V.

 The invention is not limited to the specific embodiments described above. The invention extends to any new feature or any new combination disclosed in this specification, as well as any novel method or process steps or any new combination disclosed.

Claims

1. An LED intelligent dynamic control system, comprising a power supply unit, characterized in that: further comprising a central control unit, an adjustable constant current unit and a voltage current detecting unit;  The adjustable constant current unit is connected with the control output port and the load of the central control unit, and is controlled by the central control unit to output a constant current to the load;  The voltage and current detecting unit is connected with the control input port of the central control unit, collects the load voltage and the load current parameter, and sends the collected load parameter to the central controller for processing;  The central control unit is connected to the power supply unit, receives and processes the load voltage and current parameters collected by the voltage and current detecting unit, and controls the adjustable constant current unit to output a constant current to the load. 2. The LED intelligent dynamic control system according to claim 1, wherein the central control unit comprises a single chip microcomputer or any one of an FPGA and an ARM. 3. The LED intelligent dynamic control system according to claim 1, wherein the adjustable constant current unit comprises an integrated circuit LM3401 ( Ul ), a MOSFET ( Ql ), a Schottky diode ( D1 ), and a resistor ( R4 ~ R5) and capacitor (C1), inductor (L1); the first pin (SHDN) of the integrated circuit LM3401 (U1) is connected to the source of the MOSFET (Ql), and the third pin (SNS) is passed through a fourth resistor (R4) is connected to the control output port of the central control unit, a fourth pin (HYS) is grounded via a resistor (R5), a fifth pin (GND) is grounded, and a sixth pin (HG) is connected to the gate of the MOSFET (Q1), the seventh pin connected to the drain of the MOSFET transistor (Ql,) and via a capacitor (C1) to ground, the eighth pin through a sixth resistor (R ⁶⁾ and the MOSFET (Ql,) The drain of the MOSFET (Q1) is connected to the load through an inductor (L1); the cathode of the Schottky diode (D1) is connected to the source of the MOSFET (Q1), and the anode is grounded. 4. The LED intelligent dynamic control system according to claim 1, further comprising an alarm indicating unit connected to the central control unit output port for responding to the alarm information. 5. The LED intelligent dynamic control system according to claim 4, wherein the alarm indicating unit comprises four LED tubes. 6. The LED intelligent dynamic control system according to claim 1, further comprising a temperature and humidity detecting unit connected to the input port of the central control unit, detecting temperature and ambient humidity parameters of the constant current control system and the load, and The parameters are transferred to the central control unit. 7. An intelligent dynamic control LED driving power source comprising an input stage and an output stage constituting an LED driving power source, wherein: the LED intelligent dynamic control system according to claim 1 is connected between the input stage and the output stage. 8. An LED intelligent dynamic control method, comprising: step S1, initializing a control system, and configuring an adjustable constant current module to output a minimum current;  Step S2, gradually increasing the output current of the adjustable constant current module to the rated voltage of the load; step S3, the control system locks the output current value at this time;  Step S4, the control system detects load and load current voltage changes in real time and performs dynamic adjustment.  The LED intelligent dynamic control method according to claim 8, wherein the step S2 comprises:  Step S21, gradually increasing the output current of the adjustable constant current unit;  Step S22, the voltage current detecting unit collects the voltage across the load;  Step S23, determining whether the voltage across the load is a rated working voltage, if not, returning to step S21, otherwise proceeding to step S3.  The LED intelligent dynamic control method according to claim 8, wherein the step S4 comprises the following steps:  Step S41, the voltage and current detecting unit collects the current of the load and the voltage across the load;  Step S42, determining whether the current of the load and the voltage at both ends are out of limits, and if yes, an alarm indication, otherwise the steps are as follows: Step S43, dynamically adjusting the current of the load and the voltage between the two ends; In step S44, it is dynamically detected whether the load is changed, and if yes, the process returns to step S43, and otherwise ends. 11. The LED intelligent dynamic control method according to claim 10, wherein the current overrun includes an undercurrent state and an overcurrent state.  12. The LED intelligent dynamic control method according to claim 10, wherein the voltage overrun includes an undervoltage state and an overvoltage state.  The LED intelligent dynamic control method according to any one of claims 8 to 12, wherein in step S4, the ambient temperature and humidity parameters are also monitored in real time, and the output voltage and current are adjusted according to the monitoring information, so that The ambient temperature is kept within the set range.