KR101135734B1 - Adaptive Power Supplier, High Effiency Smart LED module and LED Lamp - Google Patents

Abstract

The present invention provides the power information required for the smart LED module that is a load in the load itself, the adaptive power supply variably provides the power required by the load according to the power information provided from the load, and furthermore, LED module test apparatus The present invention relates to an adaptive power supply, a smart LED module, and an LED module test apparatus therefor, which enable accurate and rapid test of power information required for the load and the adaptive power supply.
To this end, the present invention is an LED string load consisting of one or more LEDs that are powered from the adaptive power supply, and a power information detector for monitoring the LED string load, detecting the power supply information required for the LED string load And a signal transmitter configured to transmit supply power information of the LED string load detected by the power information detector to the adaptive power supply, so that the adaptive power supply supplies power according to the transmitted supply power information. It is characterized by.

Description

Adaptive Power Supplier, High Effiency Smart LED module and LED Lamp}

The present invention relates to an adaptive power supply and a smart LED module, and more particularly, provides power information necessary for the smart LED module as a load in the load itself, and the adaptive power supply is configured according to the power information provided from the load. Variable supply of the power required by the load relates to an adaptive power supply.

The present invention is continuously invented in the Republic of Korea Application No. 10-2010-0023280 "Adaptive power supply, Smart L E D module and LED module test apparatus therefor" (hereinafter referred to as a conventional patent).

In many areas, precise control of the supply is important. In particular, devices such as light emitting diodes (LEDs) are required to more precise current control because the current changes significantly even with a small amount of voltage fluctuations.

Therefore, conventionally, as shown in the circuit diagram of FIG. 1, the AC power supplied from the AC power supply 10 uses the rectifier circuit 11, the power factor correction circuit 12, and the constant current supply circuit 15 to load 20. It was supplied to the LED module for lighting equipment as an example.

In addition, the LED module for a lighting device, which is a load, is generally composed of one or more LEDs, and a plurality of LEDs are connected in series to form an LED string, and a plurality of such LED strings are connected in parallel to form an LED module. Configure.

On the other hand, in order to prevent current draw due to the difference in the forward conduction voltage (V _F ) between the LED string, a resistor is connected in series to each LED string. Another reason for inserting series resistors into the LED string is that when the LED module is installed at an angle, not parallel to the ground, the heat generated from the module flows from the bottom to the top (convection or conduction, etc.). This is to prevent the life of the LED installed on the upper part from being relatively shortened because the temperature of the LED string installed on the upper part is higher and thus more current flows.

2 conceptually illustrates the output current control circuit of the constant current supply circuit 15 among the conventional power supplies, and FIG. 3 specifically illustrates the constant current supply circuit 15 among the conventional power supplies.

First, as shown in FIG. 2, the constant current supply circuit 15 may perform a constant current (CC: constant current, hereinafter referred to as 'CC') and overvoltage protection (OVP: OVP) function. U15).

At this time, the resistor R _H , which is installed between the two output terminals of the power supply 15, + Vout and -Vout. If the voltage divided by R _L is higher than the design reference voltage, the OVP circuit inside the circuit U ₁₅ causes a current to flow through the photocoupler light-emitting portion P15a and emits light, thereby electrically insulating the photocoupler light-receiving portion ( P15b) transmits to the power supply controller PWM that the overvoltage is supplied to the output terminal of the power supply 15.

Accordingly, the power supply controller PWM may adjust the driving time of the switching element Q ₁₅ to reduce the amount of current supplied to the output through the transformer X ₁₅ to solve the overvoltage condition.

In addition, the CC circuit inside the circuit U ₁₅ measures the amount of current flowing through the current detection resistor R _C connected in series between the load 20 and the ground 15G, and when the CC circuit is larger than the reference current amount, the photocoupler light emitting unit P15a. The current flows to the power supply controller (PWM) to transmit that the current is flowing.

Accordingly, the power supply controller PWM may adjust the driving time of the switch Q ₁₅ to eliminate the overcurrent state.

The power supply controller (PWM) operates the switch (Q ₁₅ ), there are control methods such as Discontinuous Conduction Mode (DCM), Boundry Conduction Mode (BCM), and Continious Conduction Mode (CCM). Since it is well known, it is omitted.

In particular, the OVP function prevents the output terminal voltage of the power supply from being higher than a predetermined voltage when the output terminal or the load is opened, and the CC function prevents overcurrent from flowing to the output terminal due to an operator's mistake or a short circuit of the load. do.

3 illustrates an example in which a circuit U ₁₅ that performs the CC and OVP functions is implemented as an analog device.

First, the OVP function is a power supply comparator (U) if the voltage divided by the resistors R _H and R _L installed between the two output terminals + Vout and -Vout of the power supply 15 is higher than the design reference voltage (Z _V ). The output of _V ) becomes low to allow diode D _V to conduct.

Therefore, when a current is supplied to the photocoupler light emitting device P15a to emit light, a signal indicating that the overvoltage is supplied is transmitted to the power supply controller PWM. Here, the diode Dv serves as a signal transmitter that transmits the state of the power supply voltage.

In addition, the current flowing from the output (+ Vout) of the power supply 15 to the output (-Vout) of the power supply 15 through the load 20 is supplied to the power supply 15 through the current detection resistor R _C. The current comparator U _C compares the current amount of the load detected by the current detection resistor R _C with the reference current amount Z _C , and if the detected current amount is high, the current comparator ( U _C ) Make the output low to allow diode (D _C ) to conduct.

Therefore, when current is supplied to the photocoupler light emitting device P15a to emit light, a signal indicating that the overcurrent is supplied is transmitted to the power supply controller PWM. Here, the diode Dv serves as a signal transmitter for transmitting the load current state.

5-7 and 10 show a conventional smart LED module 90 and an adaptive power supply 55. The detailed description of the operation of the circuit is described in detail in the prior patent and is replaced by the conventional patent.

However, the prior art as described above has the following problems. In the power supply information detector (U90) having a current detecting element for OCP in the adaptive power supply device 55, monitoring the load of the smart LED module 90, and detecting the supply power information required for the LED module 90. In the case of employing a separate CC current detection element, the use of two current detection elements to detect current results in low power usage efficiency.

If one example is described using numerical values, the maximum voltage across each current detecting element is 0.2V, and the output voltages across Vout + and Vout- are 12V, 0.2 / 12 x 100 = 1.67%, and the output voltages across Vout +, If Vout-) is 40V, 0.2 / 40 x 100 = 0.5% of supply power is consumed in the current-sense element. In other words, reducing the current-sense element from two to one, the power is supplied to the load by 1.67% and 0.5%, respectively, increasing the power efficiency.

The present invention has been proposed to solve the problems as described above, the art of power information necessary for the load of the smart LED modules provided in the load itself, and the adaptive power supply is that the load demand in accordance with the power information received from the load To increase the power efficiency while providing a variable power supply.

To this end, the high efficiency smart LED module, LED string load consisting of one or more LEDs; A temperature sensor measuring a temperature of the LED string; A power information detector for obtaining a design driving current from the temperature measured by the temperature sensor; And a signal transmitter for transmitting the design power information of the load to a power supply.

The adaptive power supply also includes an overcurrent prevention circuit (OCP circuit) for preventing an output current from flowing above a predetermined magnitude of current; A load information receiving terminal receiving garden information required by the smart LED module from the smart LED module; And a constant current supply circuit (CC circuit) for supplying a load with a predetermined current corresponding to the received information.

In addition, the high-efficiency LED lamp consisting of the smart LED module and the adaptive power supply, by using one current detection device for the overcurrent protection circuit (OCP circuit) and the constant current supply circuit (CC circuit); It is done.

According to the present invention as described above provides the power information required for the smart LED module as a load in the load itself, the adaptive power supply variably provides the power required by the load in accordance with the power information provided from the load, It is possible to provide a smart LED module with high efficiency.

1 is a schematic circuit diagram showing a power supply according to the prior art.
2 is a conceptual circuit diagram illustrating a constant current / overvoltage protection function according to the prior art.
3 is a circuit diagram of implementing a constant current / overvoltage protection function according to the prior art.
4 is a diagram showing the current attenuation and light emission amount of the LED with respect to temperature.
5 is a view showing a first embodiment of the adaptive power supply and smart LED module according to the prior art.
6 is a view showing a second embodiment of the adaptive power supply and smart LED module according to the prior art.
7 is a view showing a third embodiment of the adaptive power supply and smart LED module according to the prior art.
8 is a configuration diagram showing an LED module test apparatus according to the prior art.
9 is an operation flowchart of the LED module test apparatus according to the prior art.
10 is a view showing a fourth embodiment of the adaptive power supply and smart LED module according to the prior art.
11 is a diagram showing a smart LED module current attenuation curve according to the prior art.
12 is a view showing a first embodiment of a power saving smart LED module according to the present invention.
13 is a view showing a second embodiment of a power saving smart LED module according to the present invention.

Hereinafter, an adaptive power supply, a high efficiency smart LED module, and an LED lamp according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

However, in the following, the substantially identical components are represented by the same symbols, respectively, so that redundant description is omitted. In addition, in describing the present invention, when it is determined that the detailed description of the known technology or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, the adaptive power supply to be described below is an isolated fly-back, forward, push-pull or bridge, or a non-isolated buck ), Boost, or buck-boost, but may be applied to various methods. Hereinafter, a flyback power supply will be described as an example.

Example A-High Efficiency LED Lighting

This embodiment replaces the conventional load and power supply with the high efficiency smart load and the adaptive power supply of the present invention, in which the adaptive power supply uses an analog method and a high efficiency smart load using a digital method.

Hereinafter, an embodiment of the present invention will be described using the high efficiency smart load 73 and the adaptive power supply 53 shown in FIG. 12.

First, the smart load 73 will be described.

The high efficiency smart load 73 presented as an example in FIG. 12 is a smart LED module 73 including an LED.

Smart LED module 73 LED strings (LED String, LS ₇₃₎ The LED of one or more as a load connected in series, as well as to monitor the LED string (LS _73), supplying power for the LED string (LS ₇₃₎ It includes a smart circuit (U ₇₃ ) that serves as a power information detector for detecting information, the difference from the prior art is that no current detecting element for detecting the load current is used.

The smart circuit, which is a power information detector, includes a control logic-temperature sensor-memory (U ₇₃ ), a load voltage detection circuit (RH ₇₃ ) (RL ₇₃ ), and a transmission terminal (FB). The power information detector measures the temperature of the LED module and calculates a driving current suitable for the measured temperature by calculating the design current value for each temperature stored in the memory or the control logic to determine the driving current according to the temperature. A preferable example is the current attenuation curve 103 of FIG. 11], a signal transmitter DAC_CC_P, etc. for transmitting the derived result to the adaptive power supply 53 as an analog signal, and the signal transmitter includes the transmission terminal. Is connected to (FB).

The current supplied from the positive voltage output terminal (+ Vout) (-Vout) of the adaptive power supply 53 is supplied to the LED string LS ₇₃ load.

Accordingly, the power information detector measures the temperature of the LED string LS _{73 as a} load to derive a driving current suitable for the driving temperature to a memory or arithmetic, converts the driving current into an analog value with the signal transmitter DAC_CC_P, and transmits it. It transmits to the power supply 53 through FB. The analog power supply information (request driving current) can be transmitted in the form of voltage or current, and it is natural that the transmission in the normal current is a stable circuit in the long term because it can avoid signal distortion caused by (progressive) contact failure. The analog power information may be transmitted using pulse width modulation (PWM) or voltage to frequency converter (VFC).

The adaptive power supply will be described below.

The adaptive power supply 53 shown in FIG. 12 only shows the output side (secondary side) of the flyback power supply.

The difference between the adaptive power supply 53 and the conventional scheme proposed in the present invention is that the conventional power supply has supplied a constant voltage or constant current, which is its target, to the load, but the adaptive power supply 53 of the present invention is a smart load. The LED module 73 supplies power variably according to the power supply information provided by the analog, and performs the CC and OCP functions with one current detection element RC ₅₃ .

To this end, in the adaptive power supply 53, the OCP circuit for preventing the output current from exceeding a predetermined value includes a comparator UC ₅₃ , an OCP reference current ZC ₅₃ , and a current detecting element RC for detecting an amount of current flowing through the load. ₅₃ ), the CC circuit that provides the power required by the load under the condition that the OCP function is not operated (less than OCP current) includes the comparator (UC _53a ), the reference current (required current) requested as an analog signal from the load, and It consists of a current detection element RC ₅₃ . Although not shown in the circuit, of course, the OVP function may be further provided.

The circuit configuration of the adaptive power supply 53 of the present embodiment has the same basic configuration as the conventional power supply 53 of FIG. 10, but performs a CC and an OCP function with one current detecting element RC ₅₃ .

As mentioned above, the problem of the prior art was solved by Embodiment A of this invention. That is, by using an adaptive power supply and a high efficiency smart LED module, it is possible to provide a LED light (LED lamp) with higher power efficiency than the conventional.

Example B-High Efficiency LED Lighting

Embodiment B of the present invention is a further improvement of Embodiment A.

In the case of Embodiment A, when the power supply and the LED module are inserted into one structure to make the LED lamp integral, the power information request terminal (FB) may be shorted by the output terminal (-Vout) terminal and external factors of the power supply. There is no danger. However, in the case of a detachable LED lamp in which a power supply and an LED module are installed in separate cases, there may be a short circuit due to an external environment. Under the maximum design current (condition under which OCP does not operate), if two input signal levels of the CC comparator UC _53a are the same due to the short circuit, the output of the comparator UC _53a has a large noise in any input terminal. The output value is determined depending on whether In other words, the CC function is implemented based on zero current, so that no current is supplied to the load.

Hereinafter, Example B of the present invention will be described with reference to FIG.

In this embodiment B, the inverting input terminal (-) of the CC comparator UC _{53b is} connected to the current detecting element RC _{53 in the} same manner as in Example A, and the non-inverting input terminal (+) is the reference voltage selection switch SW ₅₃ ) is connected to the common terminal. The selection switch SW ₅₃ has two selection terminals, and one selection terminal is connected to a terminal FB for receiving a request for power information of a load, and the other selection terminal has a minimum representing a predetermined minimum supply current value. It is connected to the current reference value ZC _53b . At this time, it is obvious that the minimum current reference value is lower than the OCP current value. For example, if the minimum current reference value is expressed as a numerical value, the level of 10% of the OCP current will be preferable.

The selector switch SW ₅₃ is configured to set the minimum current reference value ZC _53b when the terminal FB is shorted to the terminal -Vout or when the CC request current value is lower than the minimum current reference value ZC _53b . for the service, and other than that in (UC _53b) and provides a power supply information received by the terminal (FB) for CC comparator (UC _53b)

This improves the problem of embodiment A, that is, the problem that occurs when the terminal FB is shorted with the terminal -Vout.

In the above, the present invention has been described with reference to the preferred embodiments.

The adaptive power supply disclosed by the present invention uses a transformer because the input side (primary side: controlling the power supply switch) plays a role of changing the switch adjustment period using information provided at the output side (secondary side). Naturally, it can be implemented regardless of the isolation method (flyback, forward, push-pull, bridge, etc.) as well as non-insulation method without the transformer (buck, boost, buck-boost, etc.).

Therefore, it will be understood by those skilled in the art that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

Among the new growth industry, the LED lighting industry, which is used in LED fluorescent lamps, LED incandescent lamps, and LED lamps (including external type of power supply), called LED surface lighting, the heat dissipation capacity and light conversion efficiency of individual modules according to the operating temperature. There is a need for an adaptive power supply that drives in consideration of this.

However, currently available power supplies are mostly aimed at supplying a constant current within the design input voltage range, and are not power supplies considering characteristics of individual LED modules (heat dissipation and light conversion efficiency). There is this.

Therefore, according to the present invention, the adaptive power supply and the smart LED module are supplied considering the characteristics of the individual LED modules, which are the core components of the LED lighting industry, which is a new growth industry. In use, it saves power and can be combined with any adaptive power supply and smart LED module, so the installation and maintenance cost is small, so the industrial application is very high.

10, 50: AC power supply 11, 51: rectifier circuit
12: power factor improvement circuit 15: constant current supply circuit
20: Load X15, X55: Transformer
PWM, PFC: Power Supply Controller CC: Constant Current
OVP: Overvoltage Protector OCP: Overcurrent Protector
UV: Voltage Comparator UC: Current Comparator
70, 90: Smart LED Module 55, 57: Adaptive Power Supply
72: programmable power supply 71: test / adjustment process controller
74: programmable light meter

Claims (1)

In the LED lamp used for lighting,

An LED string load consisting of one or more LEDs;
A temperature sensor measuring a temperature of the LED string;
A power information detector for obtaining a design driving current from the temperature measured by the temperature sensor;
And a signal transmitter for transmitting the design power information of the load to a power supply.

An overcurrent prevention circuit (OCP circuit) for preventing an output current from flowing above a predetermined magnitude of current;
A load information receiving terminal receiving garden information required by the smart LED module from the smart LED module;
Adaptive power supply comprising a; constant current supply circuit (CC circuit) for supplying a predetermined current corresponding to the received information to the load

An LED lamp composed of the smart LED module and the adaptive power supply, comprising: using one current detection device for the overcurrent prevention circuit (OCP circuit) and the constant current supply circuit (CC circuit) in common; High efficiency LED lamps.

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