A LED feedback voltage stabilization driving device

Abstract

The present invention discloses an LED feedback voltage-stabilizing driving device, which comprises: a microcontroller, a first feedback circuit, a second feedback circuit, an oscillation circuit and a comparison circuit. Through the arrangement of the first feedback circuit and the second feedback circuit, the voltage and current of a power supply component can be adjusted to be stable before entering the microcontroller. Then the microcontroller will adjust the received voltage and current with the oscillation circuit back and forth, and at the same time transmit the signal of the microcontroller and the signal of the oscillation circuit to the comparison circuit for cross comparison. After obtaining the best signal, the pulse circuit is adjusted and converted, and finally transmitted to the driving circuit for driving. In addition, during the operation of the driving circuit, the voltage and current will be output to the second feedback circuit for adjustment, and then transmitted to the microcontroller for comparison. Through the repeated transmission of the driving circuit, the power supply component can provide the most suitable voltage and current to the driving circuit for driving.

Description

Technical Field

[0001] The present invention discloses an LED feedback voltage stabilizing driving device, which is particularly applied to the field of lighting. It mainly adjusts the voltage input repeatedly to match the voltage required by the LED, so that the LED can be driven to obtain the best light brightness and avoid excessive heat emitted by the LED to maintain the service life of the LED. It is an invention with excellent practicality. Background Art

[0002] LED is one of the most common light-emitting parts nowadays, which can provide extremely bright lighting. However, its disadvantage is that its heat dissipation is poor, which shortens its service life and causes the light irradiation of LED to gradually decay, and finally it can no longer emit light. Therefore, for many light-emitting devices on the market (such as car lights), when a single voltage and current is supplied to LED, the brightness of the car lights will have the best lighting lumens in the early stage, until the later stage, due to poor heat dissipation and the location of LED in a closed space, the LED will be in a high-temperature space for a long time. In the long run, the efficiency of LED will be significantly reduced, and finally it will burn out and must be replaced, which is a waste of time and cost.

[0003] In addition, when the LED performance decreases, the voltage and current supplied will not be reduced due to the decrease in LED performance. It can only be maintained at a certain voltage and current. This method will also accelerate the damage of the LED. Therefore, how to improve the power provided to maintain the life of the LED without affecting the light intensity of the LED lighting is an important issue. Summary of the invention

[0004] The main purpose of the present invention is to provide an LED that can transmit the most suitable voltage and current to the LED during driving, so that the LED can emit the strongest light under the optimal voltage and current, thereby maintaining the service life of the LED. The present invention improves the prior art that the general LED driving is in a single voltage and current supply, but the heat dissipation of the LED is poor, so that the lighting efficiency of the LED gradually decreases, and the input voltage and current will not be adjusted according to the decline in the efficiency of the LED, resulting in the shortcomings of shortening the service life of the LED.

[0005] To this end, the inventors of the present invention have made great efforts to achieve the purpose and effect of the aforementioned creation. The present invention provides an LED feedback voltage-stabilizing driving device, which includes: a microcontroller, which has a built-in control unit, an input unit and an output unit; a first feedback circuit, which receives power from a power supply component, and the first feedback circuit is electrically connected to the input unit of the microcontroller; a second feedback circuit, which receives power input from a driving circuit and is electrically connected to the input unit of the microcontroller; an oscillating circuit, which forms a reciprocating loop with the input unit and the output unit of the microcontroller, and the oscillating circuit receives the signal output by the output unit of the microcontroller, and after calculation, it is fed back to the input unit of the microcontroller; and a comparison circuit, which receives the signals output by the microcontroller and the oscillating circuit, and outputs them to a pulse circuit for voltage comparison. , current amplification, conversion and shaping, and the pulse circuit converts and adjusts it before transmitting it to the drive circuit for electric drive; wherein, through the setting of the first feedback circuit and the second feedback circuit, the voltage and current of the power supply component can be adjusted to stability before entering the microcontroller, and then the microcontroller will reciprocate the received voltage and current with the oscillation circuit, and at the same time transmit the signal of the microcontroller and the signal of the oscillation circuit to the comparison circuit for cross-comparison, and after obtaining the best signal, the pulse circuit is adjusted and converted, and finally transmitted to the drive circuit for driving; and during the operation of the drive circuit, the voltage and current will be output to the second feedback circuit for adjustment, and then transmitted to the microcontroller for comparison. Through the repeated transmission of the drive circuit, the power supply component can provide the most suitable voltage and current to the drive circuit for driving.

[0006] According to the above description, the advantage of the present invention is that, through the arrangement of the first feedback circuit and the second feedback circuit, the use of the power supplied by the power supply component to the driving circuit can reach the most suitable range value, so that the operation of the driving circuit can be driven by the best power to achieve the best yield, thereby maintaining the service life of the driving circuit. Compared with the shortcomings of the prior art that a certain amount of electricity is continuously supplied regardless of factors such as the degradation of the LED, resulting in a shortened service life of the LED, the present invention can output the most suitable power (including the best voltage and current) under the combination of the microcontroller and the oscillation circuit, so that the driving circuit can operate with the most suitable power supply, thereby maintaining the service life of the driving circuit and the power supply component. It can be seen that the present invention can be said to be a creation that is quite practical and progressive, and is quite worthy of promotion by the industry and disclosure to the public. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a block diagram of a preferred embodiment of the present invention.

[0008] Figure 2 It is a circuit diagram of a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0009] In order to clearly illustrate the above-mentioned purpose and effect that this invention can achieve, the following diagrams are provided to illustrate the features and effects of this invention in detail. Figure 1 and Figure 2 As shown, the present invention is an LED feedback voltage-stabilizing driving device, which includes: a microcontroller 1, which has a built-in control unit 11, an input unit 12 and an output unit 13. The microcontroller 1 is the main core of the driving device of the present invention, and the control unit 11 controls and converts the input and output of the signal; a first feedback circuit 2, which receives power from a power supply component 3, and the first feedback circuit 2 is electrically connected to the input unit 12 of the microcontroller 1, and the first feedback circuit 2 controls the input / output impedance of the power supply component 3 and the bandwidth of the amplification circuit; a second feedback circuit 4, which receives power input from a driving circuit 5, and is connected to the input unit 12 of the microcontroller 1 2 is electrically connected, the second feedback circuit 4 is mainly used to reduce the gain, noise sensitivity, reduce nonlinear distortion and control the input / output impedance of the circuit; an oscillating circuit 6, which forms a reciprocating loop with the input unit 12 and the output unit 13 of the microcontroller 1, the oscillating circuit 6 receives the signal output by the output unit 13 of the microcontroller 1, and then returns it to the input unit 12 of the microcontroller 1 after calculation; and a comparing circuit 7, which receives the signal output by the microcontroller 1 and the oscillating circuit 6, and outputs it to a pulse circuit 8 for voltage and current amplification, conversion and shaping, and then the pulse circuit 8 converts and adjusts it and then transmits it to the driving circuit 5 for power driving.

[0010] According to the above description, before the initial start, the power supply component 3 will first adjust the voltage and current of the power through the first feedback circuit 2, and then transmit it to the microcontroller 1 for control, setting, and conversion by the control unit 11. At this time, the microcontroller 1 will divide the voltage and current into two paths, one of which will be transmitted to the oscillation circuit 6. The oscillation circuit 6 is mainly a circuit that converts the DC power of the power supply component 3 into an AC signal of a certain frequency, generates AC oscillation as a signal source, and then transmits it back to the microcontroller 1 to form a reciprocating loop after completion. The other voltage and current of the microcontroller 1 will be directly transmitted to the comparison circuit 7. At the same time, the circuit converted in the oscillation circuit 6 will also be partially transmitted to the comparison circuit 7. The output of the microcontroller 1 and the output of the oscillation circuit 6 are compared simultaneously through the comparison circuit 7. After the comparison is completed, it will be transmitted to the pulse circuit 8 for the final adjustment of the wavelength, frequency, etc., and finally transmitted to the drive circuit 5 for driving use.

[0011] Continuing with the above, after the driving circuit 5 starts to operate, in order for the driving circuit 5 to obtain the best and most appropriate power size, the driving circuit 5 will transmit part of the power to the second feedback circuit 4 for adjustment, and then transmit it back to the input unit 12 of the microcontroller 1, and then control, conversion and other processes are performed through the microcontroller 1 (connecting back to the above-mentioned actions). Therefore, at the same time, the power of the power supply component 3 is adjusted back and forth uninterruptedly, and the power finally obtained by the driving circuit 5 is the best and most appropriate amount of power, so that the service life of the driving circuit 5 can be maintained, and the best yield is maintained, the number of replacements is reduced, and the payment of costs is reduced.

[0012] According to the above description, other technical features of the present invention are described. First, in the use of the driving circuit 5, the present invention utilizes a field effect transistor 51, an LED 52 and a plurality of capacitors 53 in the driving circuit 5, wherein the arrangement of the capacitors 53 is mainly arranged in parallel with each other, and each capacitor 53 is connected in parallel with each other to form two nodes at the head and the tail, wherein one node is electrically connected to the LED 52, and the other node is electrically connected to a voltage stabilizing diode 54. The setting of the voltage stabilizing diode 54 can stabilize the voltage and current, thereby providing each capacitor 53 with a stable voltage, so that the plurality of capacitors 53 can effectively perform voltage filtering and the energy storage function of the pulse voltage source, and the voltage stabilizing diode 54 is electrically connected to the DRAIN end (drain) of the field effect transistor 51 and the oscillation circuit 6. In addition, the microcontroller 1 The output unit 13 further includes a first output point 131 electrically connected to the driving circuit 5. The first output point 131 is electrically connected to the GATE terminal (gate) of the field effect transistor 51. In addition, a first resistor 9 is further electrically connected to the junction of the first output point 131 and the field effect transistor 51. The first resistor 9 reduces the impedance of the output of the microcontroller 1, and the resistance value of the first resistor 9 is 1MΩ. The source terminal (source) of the field effect transistor 51 is grounded; therefore, when the field effect transistor 51 is turned on, the oscillation circuit 6 is charged with voltage. Conversely, when the field effect transistor 51 is turned off, the oscillation circuit 6 is inductively discharged. In the conversion process of charging and discharging, the passing voltage is inverted and a counter electromotive force (counter emf) is generated, and the voltage is gradually pulled higher than the input voltage. The switching duty cycle and frequency of the bias signal input to the GATE terminal (gate) of the field effect transistor 51 can determine the ratio of the voltage increase.

[0013] Continuing from the above, the aforementioned oscillation circuit 6 further includes a driving coil 61 and an oscillation capacitor 62, so the charging when the field effect transistor 51 is turned on is mainly for charging the driving coil 61, and the discharging is also performed by the driving coil 61. The microcontroller 1 further includes a first input point 121 for receiving the voltage of the first feedback circuit 2 and a second input point 122 for receiving the power of the power supply component 3 in the setting of the input unit 12. The voltage of the first feedback circuit 2 enters the control unit 11 of the microcontroller 1 through the first input point 121, and the power of the power supply component 3 enters the control unit 11 of the microcontroller 1 through the second input point 122 for calculation, and is then transmitted from the output unit 13 to the oscillation circuit 6 and the comparison circuit 7. The signal transmitted to the oscillation circuit 6 will be repeatedly adjusted and then transmitted back to the microcontroller 1, and the signal transmitted to the comparison circuit 7 will be compared with the signal transmitted by the oscillation circuit 6. Through the setting of the field effect transistor 51, the microcontroller 1 can maintain the stability of the signal at the output of the first output point 131.

[0014] In addition, the present invention mainly drives the LED 52 in the driving circuit 5 with the best power, so the power transmission must be maintained at the best. Therefore, the appropriate impedance can reduce the voltage and current to prevent the voltage and current from being too large and affecting the entire device. Therefore, the first feedback circuit 2 further includes a second resistor 21 and a third resistor 22. The second resistor 21 and the third resistor 22 are connected in series, and a node is formed between the second resistor 21 and the third resistor 22 to electrically connect the input unit 12 of the microcontroller 1. In addition, the present invention further includes a second resistor 21 and a third resistor 22. The resistance setting of the resistor 22 is that the second resistor 21 is 2MΩ and the third resistor 22 is 1MΩ. Similarly, the second feedback circuit 4 also has a resistor setting, which includes a fourth resistor 41 and a fifth resistor 42. The fourth resistor 41 and the fifth resistor 42 are connected in series and form a node electrically connected to the input unit 12 of the microcontroller 1. The resistance value of the fourth resistor 41 is 2MΩ, and the resistance value of the fifth resistor 42 is 1MΩ. With this setting, the present invention can transmit voltage and current without burning out the LED 52.

[0015] The basic description of the comparison circuit 7 in the present invention is further described. First, the comparison circuit 7 is mainly called an operational comparator. The comparison circuit 7 includes a positive input terminal 71, a negative input terminal 72 and an output terminal 73. When the voltage of the positive input terminal 71 is higher than that of the negative input terminal 72 (the voltage output by the microcontroller 1 is higher than that output by the oscillation circuit 6), the output of the output terminal 73 will be a positive saturation voltage. On the contrary, when the voltage of the negative input terminal 72 is higher than that of the positive input terminal 71, the output terminal 73 will output a negative saturation voltage. Therefore, after repeated adjustments of the microcontroller 1 and the oscillation circuit 6, after comparison by the comparison circuit 7, the optimal voltage and current can be provided for the LED 52 of the driving circuit 5, thereby maintaining the service life of the LED 52 and avoiding rapid wear and tear and resulting in an increase in cost. The comparison expression for the comparison circuit 7 can be: V out =A 0 (V 1 -V 2 ), where V out is the voltage output by the output terminal 73, V 1 is the voltage of the positive input terminal 71, V 2 is the voltage of the inverting input terminal 72, A 0 For the open-loop amplifier gain, see Figure 2 shown.

[0016] Finally, the present invention uses a capacitor with a value of 10μF in the use of each capacitor 53 and the oscillation capacitor 62 in the oscillation circuit 6; in addition, the voltage-stabilizing diode 54 electrically connected between the multiple capacitors 53 and the DRAIN terminal (drain) of the field effect transistor 51 is also called a Zener diode (English: Zener diode). The present invention utilizes the collapse effect formed by the voltage-stabilizing diode 54 under the action of reverse voltage to stabilize the voltage flowing through the LED 52 and prevent the LED 52 from burning out.

[0017] The above embodiments are only used to further illustrate an LED feedback voltage-stabilizing driving device of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A LED feedback voltage stabilization driving device, Features: It includes: A microcontroller having a built-in control unit, an input unit and an output unit; a first feedback circuit receiving power from a power supply component, and the first feedback circuit is electrically connected to the input unit of the microcontroller; a second feedback circuit receiving a power input from a driving circuit and electrically connected to an input unit of the microcontroller; an oscillating circuit, which forms a reciprocating loop with the input unit and the output unit of the microcontroller, and the oscillating circuit receives the signal output by the output unit of the microcontroller and transmits it back to the input unit of the microcontroller after calculation; and a comparison circuit, which receives the signals output by the microcontroller and the oscillation circuit, and outputs them to a pulse circuit for voltage and current amplification, conversion and shaping, and the pulse circuit converts and adjusts them before transmitting them to the drive circuit for electric drive; Among them, through the setting of the first feedback circuit and the second feedback circuit, the voltage and current of the power supply component can be adjusted to be stable before entering the microcontroller, and then the microcontroller will reciprocate the received voltage and current with the oscillation circuit, and at the same time transmit the signal of the microcontroller and the signal of the oscillation circuit to the comparison circuit for cross comparison. After obtaining the best signal, the pulse circuit will adjust and convert it, and finally transmit it to the drive circuit for driving; during the operation of the drive circuit, the voltage and current will be output to the second feedback circuit for adjustment, and then transmitted to the microcontroller for comparison. Through the repeated transmission of the drive circuit, the power supply component can provide the most suitable voltage and current to the drive circuit for driving.

2. According to claim 1, an LED feedback voltage stabilization driving device, Features: The driving circuit includes a field effect transistor, an LED and a plurality of capacitors. Each capacitor is arranged in parallel and one end of the head and tail is electrically connected to the LED, and the other end of the LED is grounded. The other end of each capacitor after being arranged in parallel is electrically connected to the DRAIN end (drain) of the field effect transistor, and the field effect transistor and each capacitor connected in parallel are further connected to the oscillation circuit. When the field effect transistor is turned on, the oscillation circuit is charged with voltage. When the field effect transistor is turned off, the oscillation circuit performs inductive discharge, and a counter-electromotive force (counteremf) is generated during the charging and discharging conversion process of the oscillation circuit.

3. The LED feedback voltage stabilization driving device according to claim 2, Features: The input unit of the microcontroller further includes a first input point for receiving the voltage of the first feedback circuit, and a second input point for receiving the power of the power supply component. The voltage of the first feedback circuit enters the control unit of the microcontroller through the first input point, and the power of the power supply component enters the control unit of the microcontroller through the second input point for calculation, and is then simultaneously transmitted from the output unit to the oscillation circuit and the comparison circuit. The signal transmitted to the oscillation circuit will be repeatedly adjusted and then transmitted back to the microcontroller, and the signal transmitted to the comparison circuit will be compared with the signal transmitted by the oscillation circuit.

4. The LED feedback voltage stabilization driving device according to claim 3, Features: The output unit of the microcontroller further includes a first output point electrically connected to the driving circuit, and the first output point is electrically connected to the GATE terminal (gate) of the field effect transistor. In addition, a first resistor is further electrically connected at the junction of the first output point and the field effect transistor, and the first resistor reduces the impedance of the microcontroller output, and the resistance value of the first resistor is 1MΩ.

5. The LED feedback voltage stabilization driving device according to claim 4, Features: The oscillation circuit further includes a driving coil and an oscillation capacitor. When the field effect transistor is turned on, the driving coil in the oscillation circuit is charged with voltage. Conversely, when the field effect transistor is turned off, the driving coil is discharged inductively. During the conversion process between charging and discharging of the inductor, the voltage is inverted to generate a reverse electromotive force, thereby gradually increasing the voltage.

6. An LED feedback voltage stabilization driving device according to any one of claims 1 to 5, Features: The first feedback circuit further includes a second resistor and a third resistor. The second resistor and the third resistor are connected in series and form a node electrically connected to the input unit of the microcontroller. The resistance value of the second resistor is 2MΩ, and the resistance value of the third resistor is 1MΩ.

7. The LED feedback voltage stabilization driving device according to claim 6, Features: The second feedback circuit further includes a fourth resistor and a fifth resistor. The fourth resistor and the fifth resistor are connected in series and form a node electrically connected to the input unit of the microcontroller. The resistance value of the fourth resistor is 2MΩ, and the resistance value of the fifth resistor is 1MΩ.

8. The LED feedback voltage stabilization driving device according to claim 7, Features: The comparison circuit is an operational comparator. The comparison circuit further includes a positive input terminal, a negative input terminal and an output terminal. When the voltage of the positive input terminal is higher than that of the negative input terminal, a positive saturation voltage is output at the output terminal; when the voltage of the negative input terminal is higher than that of the positive input terminal, a negative saturation voltage is output at the output terminal. The expression of its transfer function can be written as: V out =A 0 (V 1 -V 2 ), V out is the voltage output at the output terminal, V 1 is the voltage at the non-inverting input terminal, V 2 is the voltage at the inverting input terminal, A 0 is the open loop amplifier gain.

9. The LED feedback voltage stabilization driving device according to claim 2, Features: A voltage stabilizing diode is further electrically connected between the plurality of capacitors and the DRAIN terminal (drain) of the field effect transistor.

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