TW202046821A - Three-phase power-driven light-emitting diode circuit device has a current-limiting drive IC to output a stable working current that is capable of improving single-phase AC linear power flicker and three-phase imbalance problem - Google Patents

Abstract

There is a three-phase power-driven light-emitting diode circuit device which outputs a DC power supply after rectifying a three-phase AC power through a rectifier, and then outputs a stable working current to the light-emitting diode by a current-limiting drive IC. The working current can provide a stable working current output according to a working voltage set by the rectified voltage value of the input three-phase power supply, which can effectively solve the circuit electromagnetic interference, improve the power factor, reduce harmonic distortion and three-phase imbalance, and also improve the general single-phase AC linear power flicker problem. The working current matches the voltage value of the light-emitting diode, which promotes the efficiency of the power supply and reduces energy loss.

Description

Three-phase power supply driving light-emitting diode circuit device

A three-phase AC power supply is used to output a DC voltage source with a three-phase full-wave rectifier, and the working current is set according to the power required by the light-emitting diode through the current-limited drive integrated circuit, which solves the problem of single-phase AC linear circuit flicker, three Phase imbalance improves the power conversion efficiency and reduces energy loss in the technical field.

Generally, light-emitting diodes are widely used, not only for lighting functions, but also for the purpose of advertising and road signs. In order to save expensive electricity bills and ease of use, light-emitting diodes are currently used as light sources; however, most light-emitting diodes It operates from AC to DC power supply and AC linear power supply, so it is impossible to use three-phase AC as the power supply. Moreover, if three-phase AC is used as the power supply, it is necessary to add some complex circuits and high-cost circuit devices, such as phase voltage conversion In order to avoid danger, a power conversion circuit should be installed far away from the load. However, due to the distance, the circuit itself will cause power loss.

Due to the aforementioned problems, the following deficiencies are caused: 1. The operation of light-emitting diodes cannot be operated under high voltage and high current with a three-phase AC power supply; 2. If a three-phase power supply is used, the applied circuit is more complicated and costly Higher; 3. Because the circuit is complicated, the assembly is not easy to make mistakes and cause danger.

Therefore, there is a Chinese Mainland Invention Patent Announcement No. 101989817B "Three-Phase LED Power Supply", and its main purpose is to use three-phase AC as the power source. After three-phase rectification, a ripple DC voltage is formed, which is then stabilized by a DC converter. , And LED lights are all set in the three-phase rectifier At the elevated position on the upper side, because the three-phase AC power is used to spread the power distribution away from the three-phase rectifier, the distribution power loss to the LED lamp is reduced; as mentioned above, the power consumption of the circuit device itself increases , Because after three-phase full-wave rectification, it flows to the AC converter through a high-frequency step-down transformer, so that the dropped AC voltage is output by a voltage stabilizing circuit including a bridge rectifier to drive LED lamp; therefore, the aforementioned working current is the power supplied to the load obtained with the reduced voltage value after the step-down transformer. Therefore, it is necessary to determine the specifications of the high-frequency step-down transformer based on the power required by the load. Obtain the required operating current; however, the specifications of the three-phase AC power supply, such as the 220/380V three-phase power supply used in mainland China, and the 120/208V or 277/480V three-phase voltage in the United States, the load required operating current It is bound to change the specifications of the step-down transformer to drive the LED lights normally, which will make the circuit assembly more complicated.

Furthermore, the previous proposal is equipped with a step-down transformer and a capacitor for voltage stabilization and filtering. The circuit itself has capacitive reactance and inductive reactance, which increases the impedance of the circuit, which will increase the power loss of the circuit and reduce the power conversion efficiency. Reduce the power factor of the system and increase the total harmonic distortion of the system current. As shown in the third and fourth figures, this waveform is the low power conversion efficiency caused by the low voltage of the matched LED series. The test result only obtained the power conversion efficiency of 75.2%.

In order to solve the aforementioned problems, a three-phase AC power supply is used to output a stable DC voltage through a three-phase rectifier, and then a current-limiting drive integrated circuit clamps the maximum operating current, so that the square wave operating current waveform is close to the DC voltage waveform. To obtain the maximum power factor, that is, to obtain a maximum power output, the power conversion efficiency is improved and the energy loss is reduced.

The main purpose of the present invention is to provide a three-phase power supply driving light-emitting diode circuit device, which uses three-phase alternating current to form a direct current voltage through a three-phase rectifier. The direct current voltage is directly Connect a current limiting drive integrated circuit, and output an optimal working current to drive the light emitting diode, thereby improving its efficiency. Among them, a three-phase AC power supply is connected to the input end of a three-phase rectifier, its output end is electrically connected to the input end of the current limiting drive integrated circuit, and its output end is connected to the light emitting diode group.

The second objective of the present invention is still to provide a three-phase power supply driving light emitting diode circuit device, wherein the current limiting drive integrated circuit is composed of a logic circuit, a data processor, a short circuit protection circuit, and a thermal circuit. It is composed of a protection circuit, a comparator, and a current regulating element (such as field effect transistor MOSFET, BJT---, etc.), and the current regulating element is electrically connected to a light emitting diode group; the aforementioned light emitting diode group, It is also possible to connect arrays of light-emitting diode groups in parallel; when the high voltage value of a three-phase AC power supply is selected, a smooth DC voltage is output through a three-phase rectifier, and the logic circuit is driven by the DC voltage to output a signal to the comparator. The signal controls the current adjusting element to control and output the best working current to the light-emitting diode group to improve the overall performance of the circuit device.

Yet another object of the present invention is to provide a three-phase power supply driving light emitting diode circuit device, in which the signal detected by the current regulating element passes through a short circuit protection circuit, and if there is an abnormal working current, the short circuit protection circuit will detect , The short-circuit protection circuit outputs a signal to the data processor and outputs a disconnection signal to the comparator, and the comparator cuts off the current regulating element to cut off the action of the light-emitting diode group, providing protection for the light-emitting diode group due to short circuit The danger of burning.

Another object of the present invention is to provide a three-phase power supply driving light-emitting diode circuit device, wherein the signal detected by the circuit device passes through a thermal protection circuit, and if an abnormal temperature rises, the thermal protection circuit detects Out, the thermal protection circuit outputs a signal to the data processor and outputs a disconnection signal to the comparator to reduce the current output, so that the light-emitting diode group reduces the power, It is used for overheating protection of the LED group.

In some embodiments, the light-emitting diode group and the current-regulating element output end of the current-limiting integrated circuit can also be arrayed in parallel with the current-regulating elements of the light-emitting diode group and the current-limiting integrated circuit, and in each group A switch element can also be arranged between the light emitting diode group and the current regulating element of the current limiting integrated circuit. Switch the number of LED groups.

In some embodiments, the aforementioned switching element may be a manual control or electronic control to perform switching operations.

3P‧‧‧Three-phase AC

3D‧‧‧Three-phase rectifier

V‧‧‧DC voltage

IC‧‧‧Current limit drive integrated circuit

LED‧‧‧Light Emitting Diode

IC1‧‧‧Logic circuit

IC2‧‧‧Data Processor

IC3‧‧‧Short circuit protection circuit

IC4‧‧‧Thermal protection circuit

IC5‧‧‧Comparator

IC6‧‧‧Current adjustment element

S‧‧‧Switching element

The first figure is a circuit diagram of a three-phase power supply driving a light-emitting diode group.

The second figure is a block diagram of the current limiting drive integrated circuit.

The third picture is a diagram of a DC power source formed by a three-phase alternating current through a three-phase rectifier.

The fourth diagram is a test diagram of the present invention matching lower light-emitting diode voltage and stable DC current source output.

The fifth figure is a test diagram of the invention matching the voltage of the light-emitting diode after rectification, and the power efficiency improvement.

Please refer to the first, second, and third diagrams. The three-phase alternating current 3P is used to form a direct current voltage V through a three-phase rectifier 3D. The direct current voltage V is directly connected to a current limiting drive integrated circuit IC, making the circuit device incapable Impedance power loss of resistance and inductive reactance, and no light-emitting diode flashing phenomenon caused by general electromagnetic waves or other interference, and make the working current and the waveform of the DC voltage V converge to improve the power factor of the circuit And power conversion efficiency; therefore, this circuit device mainly uses three-phase alternating current 3P to form a stable direct current voltage V through a three-phase rectifier 3D. The AC power source 3P is connected to the input end of the three-phase rectifier 3D, the output end is electrically connected to the input end of a current-limiting drive integrated circuit IC, and the output end is electrically connected to the LED of the light emitting diode group.

Please refer to the second figure, the current limiting drive integrated circuit IC is composed of a logic circuit IC1, a data processor IC2, a short circuit protection circuit IC3, a thermal protection circuit IC4, a comparator IC5, and a current regulating element IC6 composition, and the current regulating element IC6 is electrically connected to a light-emitting diode group LED; the aforementioned light-emitting diode group LEDs can also be connected in parallel to the group of light-emitting diode group LEDs; when the three-phase AC power supply 3P high voltage The voltage value, through the three-phase rectifier 3D, outputs a smooth DC voltage V, the logic circuit IC1 is driven by the three-phase DC voltage V to output a signal to the comparator IC5, and then the signal triggers the current regulating element IC6 to turn on to output The working current drives the light-emitting diode group LED; the current detection circuit composed of the aforementioned comparator IC5 and the current regulating element IC6 detects the working current output by the current regulating element IC6, and the data processor IC2 according to the preset It is set to output a signal to the comparator IC5, so that the comparator IC5 then outputs a signal to drive the current regulating element IC6 to improve the performance of the system.

Please refer to the first and second figures, the signal detected by the current detection circuit formed by the comparator IC5 and the current adjustment element IC6 passes through the short-circuit protection circuit IC4, and if there is an abnormal operating current, the short-circuit protection circuit IC4 It is detected that the short circuit protection circuit IC4 outputs a signal to the data processor IC2 and outputs a disconnection signal to the comparator IC5, then the comparator IC5 cuts off the conduction of the current regulating element IC6 to cut off the action of the LED of the light emitting diode group ,Provides protection against the danger of short-circuit and burnt-out of the LED of the light-emitting diode group.

Please refer to the first and second figures. The signal detected by the current detection circuit formed by the comparator IC5 and the current regulating element IC6 passes through the thermal protection circuit IC4. If there is an abnormal temperature increase, the thermal protection circuit IC4 detects, the thermal protection circuit IC4 outputs the signal to the data processing The IC2 outputs a signal to the comparator IC5, and the comparator IC5 outputs a signal to reduce the conduction current of the current regulating element IC6, which is used for overheating protection of the LED of the light emitting diode group.

Please refer to the fifth figure, the actual test result of the output power of the LED of the present invention under the set voltage and working current, its efficiency is about 92.1%, therefore, it emits two The input power efficiency of the polar body group LED is significantly improved.

The aforementioned current regulating element IC6 can be a field effect transistor MOSFET, BJT---, etc.; the aforementioned element has the same function.

Please refer to the first figure, the output terminal of the current regulating component IC6 of the LED and current limiting integrated circuit IC, and the current regulating component IC6 of the LED and current limiting integrated circuit IC can be connected in parallel. Moreover, a switch element S can be arranged between each group of light emitting diode group LEDs and the current regulating element IC6 to switch the output quantity of the light emitting diode group LED.

The aforementioned switch element S can be a manual or electronic control to perform switching on and off.

3P‧‧‧Three-phase AC

3D‧‧‧Three-phase rectifier

V‧‧‧DC voltage

IC‧‧‧Current limit drive integrated circuit

LED‧‧‧Light Emitting Diode Group

S‧‧‧Switching element

Claims (6)

A three-phase power source driving light-emitting diode circuit device uses three-phase alternating current to form a stable direct current voltage through a three-phase rectifier; it is characterized in that the three-phase alternating current power is connected to the input end of the three-phase rectifier, and the three-phase alternating current The output end of the rectifier is electrically connected with the input end of a current limiting drive integrated circuit, and the output end of the current limiting drive integrated circuit is electrically connected with the light emitting diode group. The three-phase power supply driving light-emitting diode circuit device described in item 1 of the scope of patent application, wherein the current-limiting drive integrated circuit is composed of a logic circuit, a data processor, a short circuit protection circuit, and a thermal protection circuit , A comparator, a current adjustment element, and the current adjustment element is electrically connected to multiple groups of light-emitting diode groups. For example, the three-phase power supply driving light-emitting diode circuit device described in item 2 of the scope of patent application, wherein the signal detected by the current detection circuit composed of the comparator and the current adjustment element passes through the short-circuit protection circuit, and if there is abnormal operation The current will be detected by the short-circuit protection circuit, the short-circuit protection circuit will output a signal to the data processor and output a disconnection signal to the comparator, then the comparator will cut off the conduction of the current adjusting element to cut off the action of the light emitting diode group . For example, the three-phase power supply driving light-emitting diode circuit device described in item 2 of the scope of patent application, wherein the current detection circuit composed of the comparator and the current adjustment element passes through the thermal protection circuit. If there is an abnormal temperature increase, the The thermal protection circuit detects that the thermal protection circuit outputs a signal to the data processor and outputs a disconnection signal to the comparator, and the comparator outputs a signal to reduce the conduction current of the current regulating element. For example, the three-phase power supply driving light-emitting diode circuit device described in item 1 or 2 of the scope of patent application, wherein the light-emitting diode group and the current regulating element output end of the current-limiting integrated circuit can also be connected in parallel with the light-emitting diodes. Polar body group and current regulating component of current limiting integrated circuit, and in each group of light-emitting diodes A switch element can also be arranged between the body group and the current regulating element of the current limiting drive integrated circuit. For the three-phase power source driving light-emitting diode circuit device described in item 5 of the scope of patent application, the switching element can be a manual control or electronic control to perform switching on and off.

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