TW200935204A - Feedback-type automatic power control system - Google Patents

Abstract

A feedback-type automatic power control system suitable for controlling an electronic component comprising two electrodes. The system comprises a multiplication unit, a control unit, and a regulation unit. The multiplication unit multiplies a working voltage corresponding to the voltage difference of the electrodes by a feedback voltage corresponding to the working current of the electronic component so as to output a measurement voltage corresponding to the power of the electronic component. The control unit outputs a control voltage corresponding to the difference variation between the measurement voltage and a set voltage. The regulation unit is electrically connected between the electronic component and the control unit and comprises a transistor serial connected to the electronic component, wherein the working status of the transistor is changed along with the control voltage of the control unit.

Description

200935204 IX. Description of invention: [Technical field to which the invention belongs]

The present invention relates to a power control system, and more particularly to an authorized automatic power control system. D [Prior Art] Ο 〇 Figure 丨 shows the relationship between the luminous power and the operating current of a light-emitting diode at different component temperatures. The semiconductor components such as the LED and the laser diode are in operation. When the light-emitting power is lowered as the temperature of the element rises, it is easy to cause the light-emitting power to be unstable when the light-emitting diode is simply used without power control. ^ As shown in FIG. 2, the general-purpose LED 15 will use, for example, the circuit 10 disclosed in the "Automatic Power Controller" of the Republic of China Patent No. 92, No. 92, for the purpose of achieving stable luminous power. The circuit 1 〇 mainly uses a photodetector 14 to detect the illuminating power of the illuminating diode 15 , and then adjusts the voltage or current supplied to the illuminating diode according to the change of the detecting signal, thereby designing It is used to achieve the purpose of maintaining the luminous power stable. However, since the output light of the LED 15 is not directional, the distance between the photodetector 14 and the LED 15 , the position, the environmental hazard, and the sensitivity of the photodetector 14 are both The signal has an influence, so it is easy to have an error in the control of the illuminating power. In addition, the _signal output of the photodetector U for the different wavelengths of the illuminating diode 15 is also different, and the illuminating diode 15 is When the optical device 14 is matched with different models, the control effect of the luminous power is affected. Therefore, the above-mentioned original 5 200935204 makes it difficult to stably maintain the illumination of the LED 15 due to the current technology using the photodetector 14. Power, resulting in poor performance' [Explanation] Therefore, the object of the present invention is to provide a feedback-type automatic power control system that can directly perform power control by detecting electrical signals without transmitting light detection. ❹ ❹ Thus, the feedback type automatic power control system of the present invention is suitable for controlling an electronic component comprising two electrodes, the system comprising a multiplication unit, a control unit and an adjustment unit. The multiplying unit includes a two-multiplied input terminal and a multiplying output terminal, one of the multiplicative input terminals receiving an operating voltage value corresponding to a voltage difference of the electrodes, and the other receiving a corresponding one of the electronic components The feedback voltage value of the operating current 'the multiplication output terminal outputs a measured voltage value corresponding to the power of the electronic component, and the measured voltage value is the operating voltage value multiplied by the feedback voltage value. (4) The system early element includes two control (four) human end and - control dragon output, one of the $ control input is to receive the measured voltage value, and the other is to receive - set the voltage value 'the control output is the output a control voltage, the old voltage being a difference corresponding to the value of the measured voltage and the value of the setting (four). The adjusting unit is electrically connected between the electronic component and the control unit 'and includes-and the electronic component a series measuring resistor, a transistor connected in series between the resistors, and an amplifier 1 having an inverting input electrically connected to the measuring resistor, a Ο 35 200935204 receiving the non-inverting of the control voltage An input terminal, and an output electrically connected to the transistor, the operating state of the electrical body is changed as the output voltage of the output terminal changes. The utility model has the beneficial effects that: since the multiplication unit of the system is in the case of the difference of the operation, the working voltage value directly corresponds to the voltage difference of the equal electrode, and the feedback value is directly corresponding to the working current of the electronic component, so the precision can be accurately The power consumption of the electronic component is obtained, and according to the power consumption change, the control unit and the adjusting unit automatically adjust the power supply I to the electronic component to effectively achieve the function of maintaining the luminous power stable. [Embodiment] The foregoing and other technical features, features, and advantages of the present invention will be apparent from the following description of the preferred embodiments. As shown in FIG. 3, the preferred embodiment of the feedback automatic power control system 200 of the present invention is suitable for controlling the electrical power used by the electronic component. The electronic 70 90 includes two electrodes A and κ, in this embodiment. The electronic component 卯 is a light-emitting diode, and a laser diode can also be used in practical applications. The system 〇0 includes a voltage dividing unit 20, an amplifying unit 3〇, a multiplication unit 7L 40, and a control unit. 5 〇, and - adjustment unit. The 5H splitting unit 20 includes four voltage dividing resistors R1, R2, R3, and R4, and each of the two voltage dividing resistors forms a voltage dividing module 21, 22 through which the electrodes Μ Ϊ = 疋The voltage dividing module 21, 22 is input to the amplification first amplifier. The amplifying unit 30 includes 31 and a first adjusting resistor ' electrically connected to the 200935204: amplifier 3!, the first amplifier=input and one round ...the input terminals are electrically connected to the equal-divided modules 21, 22, respectively, and the output of the cake is corresponding to the voltage difference of the voltage difference between the electrodes Α and κ. A little LED, 6 Hai first adjustment resistor Rg〗 allows the user to adjust the output gain of the first amplifier 31, and the working power M value V- will produce a voltage change as the component temperature changes ~, so when the component The operating voltage value is expressed as: 〇

Vled + Δ Vled The multiplication unit 40 includes a square multiplication input terminal χι, γι and a multiplication output terminal W, and one of the multiplication input terminals XI, Y1 receives a voltage difference corresponding to the electrodes Α and Κ The operating voltage value Vud, the other Y1 is a feedback voltage value vRE that receives a change in the operating current corresponding to the electronic component 9〇, the multiplication output terminal w is an amount that outputs a power change corresponding to the electronic component 90. Measuring voltage value Vp, when the component temperature changes to cause the operating voltage VLED to generate a Δ \rLED, the measured voltage value Vp is the operating voltage value VLED + Δ VLed multiplied by the feedback voltage value VRE, expressed as an equation:

Vp = VrEx ( Vled + Δ V LED ) The control unit 50 includes a second amplifier 51 , two control inputs formed on the second amplification 1 § 51, and a control output formed on the second amplifier 51. And a second adjustment resistor Rg2 electrically connected to the second amplifier 51. The second amplifier 51 is an operational amplifier, and the control inputs are the non-inverting input terminal and the inverting input terminal of the operational amplifier. The inverting input terminal receives the measured voltage value VP, and the non-inverting input terminal receives the first

S 200935204 sets the power threshold value VREf ’. The control output terminal outputs a control voltage vc, and the control power M Vc corresponds to the measured voltage value VP and the set voltage value.

The difference value of the Vref is set to a user-adjustable value for changing the magnitude of the difference between the measured voltage value vP and the set voltage value Vref. The second adjustment resistor RG2 is used to make The user can quickly adjust a gain value G of the second amplifier 51 for use by electronic components 90 of different wavelengths, types, and types, and the control voltage vc is expressed by an equation.

Vc=Gx (VREF-Vp) The adjusting unit 60 is electrically connected between the electronic component 9A and the control unit 50, and includes a measuring resistor & connected in series with the electronic component 9? a transistor q between the electronic component 90 and the measuring resistor re, and a second amplifier 61 having an inverting input terminal electrically connected to the measuring resistor re and receiving the control voltage Vc Non-reverse

a phase input terminal, and an output terminal electrically connected to the transistor Q, the operating state of the transistor Q is changed with the output voltage of the output terminal. In this embodiment, the transistor 该 of the adjusting unit 60 is a field. An effect transistor (fet), an output of the third amplifier 61 is electrically connected to the gate of the transistor Q, and a multiplication input terminal Y1 of the multiplying unit 40 is electrically connected to the measuring resistor Re, the feedback The voltage value is taken from the voltage VRE of one end of the measuring resistor Re. According to the description of the above equation, it can be further calculated that the open loop gain of the system 2〇〇 is: GM(0) = Avo^gm 200935204 GM(0 For the open loop system admittance, Av〇 is the third amplifier 61 open loop gain 'gm is the admittance value of the transistor q. Consider again the measured resistance re: GMf = - inverse. (0) - = ~ 丄 wide " Λ , 1 + GM (〇 ) RE 1 + (Λ〇 x gm ) Re = GMf is the closed loop system gain, It can be seen that the output current is only related to the measuring resistor RE, and is independent of the transistor Q of the active device, so that the influence of the non-ideal parameters of the transistor Q can be minimized, and finally, the electronic component 90 can be obtained. The current iLED is: ❹ I order = heart one G (vREF -VRF. X vr.Rn, GXU...τ

Re re re ~~ YE~= / + Δ / Therefore, the present invention can appropriately adjust the current flowing through the electronic component 90 due to the change of the component temperature by adjusting the set voltage value VREF and the measuring resistor RE. Corresponding to the current change ΔJ, which is used for the purpose of maintaining the stable power output of the LED, when the LED is lowered by the temperature, the multiplication unit 40 receives the entanglement The voltage value also decreases, so that the measured voltage value Vp of the output decreases and is input to the inverting input terminal of the second amplifier 51. When the set voltage value vREF is fixed, the measured voltage value Vp and the setting are set. The control voltage V c formed by the difference in voltage value rises, thereby increasing the gate electric field of the transistor Q, so that the current Ile 通过 through the light-emitting diode increases, and thus the increased current ILED is affected by The operating voltage VLED which is reduced by the influence of temperature can automatically maintain the power of the light-emitting diode to achieve the purpose of use of the present invention. 4, 5, and 6, respectively, the present invention is applied to a light-emitting diode using three materials of blue 10 200935204 light, green light, and red light, and the gain value G of the second amplifier 51 of the present invention is respectively When the temperature of the element is increased by 2 times, 4 times, and 6 times, the luminous power after the control of the present invention corresponds to the temperature change curve. It has been proved by experiments that the power of the system can be controlled to be quite stable under the operation of the system 200. Since the control does not need to be detected by a photodetector, the measurement result is not subject to the poor directivity of the output light of the LED. The distance between the detector and the light-emitting diode, the position, the environmental light damage, and the sensitivity of the light detector (4); as long as the light-emitting diode is used to emit different wavelengths of light, different luminescent materials are used, corresponding to different needs The working voltage value VLED or different LED models can be adjusted moderately to adjust the gain value G or the set voltage value Vref to automatically maintain the stable luminous power. As can be seen from the above description, since the multiplication unit of the system 2 is operated, the operating voltage value Vled is directly corresponding to the voltage difference between the electrodes a and k, and the feedback voltage value Vre is directly corresponding to the electronic component. The current change Ι+ΔΙ is performed, so that the power consumption variation of the electronic component 90 can be accurately obtained, and according to the power consumption change, the control unit 5 and the adjustment unit 60 automatically adjust the electronic component 90. The amount of power supply can effectively achieve the purpose of automatically maintaining the luminous power. However, the above is only the preferred embodiment of the present invention, and if not, the scope of the practice of the present invention is defined as the simple equivalent change made by the present invention in accordance with the present invention. And modifications are within the scope of the invention patent. [Simple description of the diagram] 11 200935204 Figure 1 is a graph showing the relationship between luminous power and operating current of a light-emitting diode under different component temperature production; Figure 2 is a schematic diagram showing the design of a conventional control circuit 3 is a circuit diagram illustrating a preferred embodiment of the feedback type automatic power control system of the present invention; and FIGS. 4, 5, and 6 are each a graph illustrating the application of the preferred embodiment described above. The use of blue, green, and red light emitting diodes. 〇 12 200935204

[Explanation of main component symbols] 200 ···.. feedback automatic power W ........ •• Output rate control system Vp........ ••Measure voltage value 20···· ••...Voltage unit 50........ ••Control unit 21 ·· ••...Dividing module 51........ ••Second amplifier 22· ··· ••...Divided voltage module RG2... ••Second adjustment resistor R1... •...·Resistance V REF..... ••Set voltage value R2........resistance Vc ...... ••Control voltage R3 ··· .....resistance G......... ••gain value R4... ...· ·Resistance 60........ _ • Tuning unit 30.·.· ..... Amplification unit 61........, ·3rd amplifier 31 ···· ••...first amplifier Re....... ••Measurement resistance R-G1 ' ••...The first adjustment resistor V RE... ••Reward voltage value VLED+A VLED...Operation voltage value Q......... "Electric day body 40 ···· ..... Multiplication unit 90........ ••Electronic component XI ··· ····. Input terminal A, K .. ••Electrode Y1 ··· ••... Input Ι+Δ I · · • Operating current 13

Claims (1)

200935204 X. Patent application scope: 1- A feedback-type automatic power control system for controlling an electronic component. The electronic component comprises two electrodes. The system comprises: ▲ a multiplication unit, including a square multiplication input terminal and a multiplication method An output terminal, one of the multiplication input terminals receiving an operating voltage value corresponding to a voltage difference of the electrodes, and the other receiving a feedback voltage value corresponding to an operating current of the electronic component, the multiplication output The terminal is an output - a measured voltage value corresponding to the power of the f sub-component. The measured electrical value is the operating voltage value multiplied by the feedback voltage value; the control unit includes two control inputs and a control output, The control input of the f control input receives the measured voltage value, and the other is the receive-set voltage value. The control output is an output - the control voltage is corresponding to the measured voltage value and the Setting a difference in voltage value; and adjusting unit 疋 electrically connected between the electronic component and the control unit, and including a measurement in series with the electronic component a resistor, a string of transistors, a transistor between the component and the measuring resistor, and a third amplifier, the second amplifier having an inverting terminal electrically connected to the measuring resistor, receiving The non-inverting input of the control voltage, and the output of the electrical connection s Xuandian, the output voltage of the output changes. The working state of the body is along with the input I: according to the patented range $1, the feedback type automatic power control system =:, the middle of the multiplication unit is - the multiplication input is electrically connected to the - chip resistor The feedback voltage value is the voltage of 14 200935204 taken from one end of the measuring resistor. 3. The feedback type automatic power control system according to claim 2, further comprising an amplifying unit, the amplifying unit comprising a first amplifier and a first adjusting resistor electrically connected to the first amplifier, The operating voltage value is output by the first amplifier. 4' According to the scope of claim 3, the feedback type automatic power control system includes a voltage dividing unit, which includes four voltage dividing resistors, each of which forms a voltage dividing resistor. A voltage dividing module 'the voltages on the electrodes are respectively input to the first amplifier via the voltage dividing modules. 5. The feedback type automatic power control system according to claim 4, wherein the control unit further includes a second amplifier and a second adjustment resistor electrically connected to the second amplifier. The terminal and the control wheel output are formed on the second amplifier. 6. The feedback type automatic power control system according to claim 5 of the patent application scope, wherein the transistor of the adjustment unit is a field effect transistor, and the output of the fifth amplifier is electrically connected to the A gate of a transistor. 7. The feedback type automatic power control system according to claim 1, wherein the control unit further includes a second amplifier and a second adjustment resistor electrically connected to the second amplifier, the control inputs The terminal and the control output are formed on the second amplifier. According to the invention, the feedback type automatic power control system of claim 1, wherein the transistor of the adjusting unit is a field effect transistor, and the output of the third amplifier is electrically connected to the transistor. A gate. 15