TWI325285B - Driving circuit and related driving method for providing feedback control and open-circuit protection - Google Patents

Description

(3)5285 - ^ I2" 5| IX. Description of invention: [Technical field to which the invention belongs]. The present invention provides a feedback circuit for the feedback of (4) touch protection, material phase __method, especially _ - Analysis and _ circuit to the side of the illuminating device such as the drive circuit for feedback control and protection and its associated driving method. [Prior Art] Since the Light Emitting Diode (LED) has the advantages of .N, and low power consumption, the LED has been developed for use in the $1 touch towel. Replace the traditional cold-yin ray line lamp with silk ((10) F1 luminescentLamp 'CCFL). It has been widely used in consumer, advertising, industrial, military and other applications, and has become one of the focuses of research and development in the electronics industry. A light-emitting diode is a semiconductor device that directly converts electrical energy into light, just like other electronic components, when subjected to electrical current or electricity, it is highly susceptible to damage or damage. Therefore: When the pleading is increased, it must be smashed. · It can withstand the excessive current or the protection circuit of the electric gift. Luminous diodes are often used in illuminating indicators (Light sub (2) (4), or other portable electronic products, such as money, note-type, personal digital assistant ff_mlDataAssistant ’ PDA). However, the need to use large-scale LEDs for light-emitting diodes (such as large-scale seeing H-displays) has gradually increased. These two applications use a large number of LEDs to provide large displays. Because of the luminescence-polar_positive bias>1 current tilting, its forward bias increases exponentially. Generally, a current source is used to drive the light-emitting diodes so that different 1325285 —. . . _ - -- --· -- — ·.- cfb b\ Light-emitting diodes achieve consistent brightness. Please refer to FIG. 1 , which is a schematic diagram of a conventional driving circuit 100 of the prior art. The driving circuit 100 includes a voltage converting circuit 110, a light emitting device 120, and a constant current supply 130. The voltage conversion circuit 110 has a first input terminal 112 for receiving an input voltage V1N, a second input terminal 114 for receiving a feedback FB, and an output terminal 116 coupled to the illumination device 12 An input. The voltage conversion circuit 110 is for supplying the driving power S VDD to the light emitting device 120. The constant current supply 130 supplies a certain current 1 (to drive the light-emitting device 12A. In other words, the constant-voltage IL supplier 130 can dynamically adjust the value of the illumination device according to the current value of the adjustment constant current Ic. .

As shown in Fig. 1, the light-emitting device 120 & includes a plurality of light-emitting diodes 14A. 1 Note that each of the light-emitting diodes 140A is a power supply unit, and the light-emitting diode _ brightness mosquito current Ie is proportional. That is to say, each of the light-emitting diodes; the brightness of the body 140 increases as the constant current increases. In general, for Η = regret light pole, please achieve a uniform brightness, depending on the side of the electric engraver 140. In order to achieve the requirements of the luminescence measurement, the f-light-emitting diode 14G is difficult to connect in series with the square wire. That is to say, each light-emitting diode 140 is superimposed, and the light-emitting radiance and the scorpion will increase. Therefore, Rina Wei 11G G's forward bias · ν 纽 ^ ^ 110 must provide a higher drive voltage vr for, ., _ positive depends on Vf to send nuclear (9). 3| ' 1325285 ... Please refer to Fig. 2, which is a schematic diagram of another conventional driving circuit 2 of the prior art. The driving circuit 200 includes a voltage converting circuit 21, six light emitting devices 221-226, six constant current suppliers 231-236, and a selection circuit 250. The driving circuit 200 is similar to the driving circuit 1A in Fig. 1, except that the driving circuit 200 is coupled to more light emitting devices and further includes a selecting circuit 25A. In this embodiment, only six illumination devices 221-226 are labeled, but may be expanded to more or fewer illumination devices. The voltage conversion circuit 21 is used to provide a drive voltage vDD to the illumination devices 221-226. The first constant current supply 231 provides a first constant current L to drive the first driving device 221, and so on, and the sixth constant current - · / odd supply 3 236 provides a sixth constant current I6 to drive The sixth drive unit 226. However, due to the limitation of the material and process of the LED, the forward bias voltage required by each of the LEDs 240 is not the same: for example, suppose the first device 221 includes three illuminations. A diode, and each of the light-emitting diodes 24 〇. The forward bias voltage required is not the same. Therefore, the light-emitting device 221_226 has a different forward bias voltage VfrVf6. In this example, the driver circuit will use the selection circuit 250 to select the smallest voltage level from the six voltage levels % _Vd ^ to output a minimum voltage level to an input of the voltage conversion circuit 21 〇 The terminal 214 also says, 'In order to reduce the power consumption of each of the constant current supplies 231-236 and ensure that the six illumination devices 221_226 can operate normally, therefore, the selection circuit 250, the six voltage levels v_"vd_ among Select the minimum voltage level, as the most 』, voltage level VN ' and output the feedback signal FB. The smallest voltage level among the six voltage levels corresponds to six forward bias voltages! The maximum voltage level among the V/' 堡 VfrVf6 is continued with reference to Fig. 1 and Fig. 2, and the driving voltage Vdd can be adjusted according to the feedback signal FB. If the driving circuit needs to drive a plurality of illuminating devices, the selection circuit 25 〇 The voltage level vdlOpl ~ vdn)p6 selects the most, 丨, voltage level as the feedback signal FB. That is, the power consumption of each constant current supply 23 ι can be reduced. Light emitting devices 222 Destroy (or open circuit), select, circuit 250 always selects the second light level % as the feedback signal fb, in the case of reading, the driving voltage Vdd will rise continuously. It is assumed that the driving voltage is greater than that of the driving circuit 200. At the time of the maximum voltage of the load, at this time, the entire driving circuit or its internal components may be damaged. [Invention] The main object of the present invention is to disclose a driving circuit that can provide feedback control and open circuit. The invention provides a driving circuit capable of providing feedback control and open circuit protection, and the circuit to the electric material includes at least a green setting, a county conversion circuit, and an analysis and judgment of the electric equipment/use one. And - selecting a circuit. The voltage conversion circuit is lightly connected to the light-emitting, secret-Hope-electric-light-emitting device. The road is connected to the hairline, and is used to touch the hairline to open or break. The 发光 system is captured by the illuminating device and the analysis and judging circuit is configured to control the opening and closing according to the judgment result to determine whether 10 1325285 outputs one of the corresponding illuminating devices.

Voltage level. The selection circuit is coupled to the analysis and determination circuit, the switch, and the voltage conversion circuit for generating a feedback signal according to the determination result to select a minimum value of the voltage level corresponding to the illumination device. And transmitting the feedback signal to the voltage conversion circuit, wherein the voltage conversion circuit adjusts the driving voltage according to the feedback signal. In one embodiment, the illumination device comprises at least one light emitting diode. • In one embodiment, the analysis and decision circuit includes a second comparator, an open detector, and a control logic. The second comparator is configured to compare the divided driving voltage with the second reference voltage to generate a second comparison signal. The open bias detector is used to detect the state of one of the illumination devices. The control logic is configured to generate the determination result according to the second comparison signal and the first detection signal. One of the main objects of the present invention is to disclose a driving method that can provide feedback control and open circuit protection to improve the disadvantages of the prior art. The present invention provides a driving method capable of providing feedback control and open circuit protection, the driving method comprising: providing a driving voltage to drive at least a light emitting device; determining whether the light emitting device is an open circuit to generate a determination result; As a result, the control is switched to > - the opening and closing of the switch to determine whether to output the t waste level corresponding to the light-emitting crack; according to the determination result, a minimum value of the voltage level corresponding to the light-emitting device is selected. Generating a feedback signal; and adjusting the driving voltage according to the feedback signal. [Embodiment] Please refer to FIG. 3, which is a schematic diagram of a driving circuit 300 for providing feedback control and open circuit protection according to a first embodiment of the present invention. The driving circuit 300 includes a voltage conversion circuit 310, at least one illuminating device 321 - 326 (in the present embodiment, represented by six illuminating devices 321-326), at least a certain current supply 331 - 336 (in this embodiment) The six constant current suppliers 331-336 are used to represent the description, a selection circuit 350, an analysis and determination circuit 360, and at least one switch SW1 - SW6 (in the present embodiment, six switches SW1 - SW6 are used) Representative explanation). The voltage conversion circuit 310 has a first input terminal 312 for receiving an input voltage ViN'. A second input terminal 314 is configured to receive a feedback signal FB, and an output terminal 316 is coupled to the six illumination devices 321-326. Voltage conversion circuit 310 is used to provide a drive voltage VDD to all of the illumination devices 321-326. Six constant current suppliers 331 - 336 are respectively used to provide a certain current to drive the corresponding illuminating device. For example, the first constant current supply 331 provides a first constant current & to the first illumination device 321, and so on. In this embodiment, the analysis and determination circuit 360 includes a second comparator C〇MP2 and at least one open-circuit detector 381-386 (in the present embodiment, six open-circuit detectors 381-386 are used to represent the description. ), and a control logic 370. The second comparator COMP2 has a first input terminal 362 coupled to the output terminal 316 of the voltage conversion circuit 310 for receiving the driving voltage VDD, and a second input terminal 364 for receiving the 1325285.

- I a second reference voltage Vref2. The second comparator c〇MP2 compares the driving voltage VDD with the second reference voltage vref2 to generate a second comparison signal Sc2. If the driving voltage VDD is greater than the second reference voltage, the analysis and determination circuit 36 uses the six open circuit detectors 381 ~ ~ 386 to detect the state of the corresponding lighting device to produce the determination result. In other words, the open circuit detectors 381-386 detect the state of the corresponding light emitting device to generate a corresponding detection signal Sdi_Sd6 to the control logic 37A. Then, the control logic 370 controls the opening of the corresponding switches SW1 - SW6 according to the second comparison signal Sc2 and the six detection signals S (n - Sd6 (that is, the determination result) to generate six switch control signal hearts". Or in other words, the switch sW1 _SW6 controls the opening and closing according to the second comparison signal Sc2 and the six detection signals sdl_Sd6 (that is, the judgment result) to determine whether to output a voltage corresponding to the illuminating device. The level Vdr〇pl_Vdr〇p6. Consider the following conditions; if the driving voltage Vdd is smaller than the second reference voltage vref2, the control logic 37〇t is based on the second comparison signal Se2 and the six-side signal signal

Sd "Sd6 (that is, the result of the judgment) to generate six switch control signal hearts - to turn on all _ SW1 - SW6, at this time all voltage levels ν ~ - are sent to the selection circuit 35 〇. Then, the selection circuit 3s〇 from these voltage levels, wide

Yd—When the towel selects the minimum voltage, it will send a small voltage to % and send it to the second round end 314 of the voltage conversion circuit 3H). The driving voltage I can be netted according to the minimum voltage level VN (return signal FB). Assuming that the driving voltage VDD continues to rise and is greater than the second reference voltage I, the analysis 13 1325285 />:: The shape of the device 1. If any of the illumination devices are turned on by the side, the corresponding switch is turned off. . For example, if the state of the second shot 322 is an open circuit, the second switch control signal is first transmitted by swjm 〇 Vdr 〇 p2;; ^ 八他电 level Vdropl-Vdrap6 is transmitted to the lion circuit 35 〇. Then, the circuit shift selects the smallest voltage level from the five electric standards to serve as the feedback FB. Since the second illuminating device 322 is detected as an open circuit, the second voltage bit (4) 2 (in this case, approximately 〇V) is removed from the selection of the selection circuit 35 ,, and the second voltage avoids the second voltage Vdrcp2 ^_warm signal FB. At the same time, the drive voltage vDD will not continue to rise. The entire drive circuit 3 是 $ is its components will be protected from damage. In one embodiment, the illumination devices 321-326 can comprise at least one light emitting diode (LED). The constant current supplies 331-336 can each be a current draw source or a current supply source. The second comparison HC0MP2 can be a hysteresis comparator to avoid malfunction. Further, the number of light-emitting devices is not limited to six, and may be other numbers. The elements in the above-described embodiments are only used to illustrate the most exemplary embodiments of the present invention, and such elements are not essential limitations of the present invention. Please note that the second comparator COMP2 described above is only one of the implementations for explaining the analysis and determination circuit 360, and is not a limitation of the present invention. Those skilled in the art should be able to understand the various components of the analysis and determination circuit 360. Such changes are feasible 1325285 ί>:;

0 Please refer to Figure 4 and Figure 3. Fig. 4 is a schematic diagram of the voltage conversion circuit 310 in Fig. 3. The voltage conversion circuit 310 includes a first comparator COMP1 and a voltage conversion unit 318. The first comparator COMP1 has a first input for receiving the feedback signal FB, and a second input for receiving a first reference voltage Vren. The first comparator COMP1 compares the feedback signal FB with the first reference voltage Vren

To output a first comparison signal Scl. The voltage conversion unit 318 is for supplying the driving voltage VDD to the light-emitting devices 321-326 (as shown in FIG. 3), and dynamically adjusting the driving voltage v(5) according to the first comparison signal scl outputted by the first comparator COMP1. For example, if the feedback signal FB is greater than the first reference voltage Vref1, the first comparator COMP1 will rotate the first comparison signal Sci to control the voltage conversion unit 318 to reduce the driving voltage vDD until the voltage level Vn and the first reference. The voltage Vrefl is equal; if the feedback signal FB is smaller than the first reference voltage Vref1, the first comparator c〇Mpi controls

The voltage converting unit 318 is configured to increase the driving voltage vDD until the voltage level vN is equal to the first reference voltage Vren. In general, the voltage conversion circuit 31 can be implemented by any conventional power supply H, H or filament drive chip. Preferably, the voltage conversion circuit 310 can be based on an AC current source or continuously: The desired drive voltage VDD is output. Figure 5 is a schematic diagram of a driving circuit for providing a third open circuit protection according to a second embodiment of the present invention. The driving circuit 500 is similar to the driving circuit 300 in the figure, and the difference between the two is that the first figure will be 15 [r. 1\ >•, work: ' " Ί driving voltage VDD passes through a first resistor R1 And a second resistor-divided voltage-dividing-dividing driving voltage VM. Since the driving voltage Vdd usually has a higher county, a smaller divided voltage driving VM can be obtained by dividing the voltage, and the lower voltage second comparator COMP2 is easier to implement. Note that the driving circuit 5 is a modified embodiment of the driving circuit 300 shown in Fig. 3, in which the first resistor and the second resistor are not essential components. The above embodiments are merely illustrative of the invention and are not intended to limit the practical application of the invention. Please refer to FIG. 6. FIG. 6 is a schematic diagram of a driving circuit 6〇〇 for providing feedback control and open circuit thinning according to a third embodiment of the present invention. The driving circuit 6 is another modified embodiment of the driving circuit 3 shown in FIG. 3. The difference from the previous variation embodiment is that the control logic 37 of the driving circuit 600 has an output terminal. To output a round of signal S. To control a switch 640. Among them, when the signal S is output. When the high level is on time, it means that all the light-emitting devices 321-326 are detected as open circuits, and the feedback signal FB is clamped to a fixed voltage level VM. In this case, the driving voltage VDD is clamped to a fixed voltage. Please note that the feedback signal FB can be clamped to any voltage level (which can be set according to user requirements), while the voltage level VM is only used to illustrate one embodiment. In addition, the implementation of the feedback signal FB and the driving voltage VDD is well known to those of ordinary skill in the art and will not be described herein. Please refer to Figure 7 and Figure 6. Figure 7 is a diagram showing a drive circuit 700 for providing feedback control and open circuit protection in accordance with a fourth embodiment of the present invention. The driving circuit ^ is a variant of the smart circuit 6 shown in Fig. 6. The two are not described below. The driving circuit further includes a power-on delay 72 〇 and a power-on delay (10) for confirming whether the driving voltage VDD has arrived - the positive hanging - the fixed position is the same as the above case or all the light emitting cuts are similar The shape ~ white is open circuit ' or gate 730 will output a signal to control the switch _, the feedback lion is connected to the voltage level Vm, that is, if the status of the equipment 321 - 326 is open 'reward The signal ρΒ will be fixed at the voltage level %. In this case, the driving voltage Vdd is clamped at a fixed voltage. Please note that the =-subtractive FB can be whispered in any of the dragons (which can be set to meet the needs of the latter) and the voltage level VM is only used to illustrate one embodiment. In addition, the implementation of the feedback and the driving voltage Vdd is well known to those of ordinary skill in the art, and will not be described here. - month reference to Fig. 8 'Fig. 8 is a flow chart showing a driving method for providing feedback control and open circuit protection according to the embodiment of the present invention. Process _ contains the following steps: Step 8002: The process begins. Step 8004: Supply current to all of the illumination devices 32]-326 〇 Step 8006 · Provide driving light Vdd to all of the illumination devices 32i-汹. Step 8008 • Turn on all switches SW1 __SW6. Step 8010: Select the smallest voltage level from the voltage level corresponding to the wheel end of all the light-emitting devices as the feedback signal FB. Step 8012: Adjust the driving voltage Vdd according to the feedback signal fb. Step 80H: Determine whether the driving voltage Vdd is greater than the second reference voltage. The driving voltage VDD is greater than the first reference electric magic, and step 8 (4) is performed; otherwise, step 8010 is performed. Step 8016: Is there any side of the hairline? If any of the hairpins are open, go to step 8_; otherwise, go to step 8010. • Step _: Turn off the switch corresponding to the illuminator that is detected as an open circuit. Eight steps 8G2G: Determine whether the status of all the illuminators is _路. If it is king. The state of the illuminating device is open, go to step 8〇22; otherwise, execute +8 8〇1〇. Step 8022: The feedback signal fb is clamped to the driving voltage Vdd. Step 8024: The process ends.

Please refer to the drive circuit 300 shown in FIG. The light-emitting devices 321-326 included in steps 8〇〇4-8〇〇6 are supplied with current by the constant current supply 331_336, and the drive voltage Vdd is supplied from the drive circuit 310. In step 8〇〇8, all of the switches SW1 to SW6 are initially turned on. At this time, all voltage levels Vdropi - VdlOP6 are transmitted to the selection circuit 350 from the voltage level vdr. 1 _ vd winter select a minimum voltage level as the feedback signal 1^ (step 8〇1〇). Therefore, the driving voltage Vdd can be adjusted in accordance with the feedback voltage FB (step 8〇12). Then, the second comparator COMP2 starts to compare the driving voltage vDD with the second reference voltage (step 8014), if the driving voltage Vdd is smaller than the second reference voltage vref2, 18 1325285: then all the switches 6 are turned on. _ The electric f(10) is greater than the second reference voltage %, then the open circuit detector 381-386 will:: Correspond to the wire read wire inspection _ there is any - bribe device = open circuit (deep secret). If there is no - the state of the hairline is set to open t, the step surface; if the state of one of the light-emitting devices is detected as an open circuit, the corresponding opening and closing is closed (step _. _ is the open circuit of the illuminating device, the corresponding voltage level is removed from the option of the selection circuit 35 。 Then the 'selection circuit 350 will be from the voltage level corresponding to the illuminator basin detected as open circuit Among other financial voltage levels, the smallest voltage level is selected as the feedback signal FB (closed step coffee). Finally, the driving dragon Vdd is adjusted according to the updated feedback signal FB. In another case, if All of the illuminating devices are turned on by the side, and the feedback signal FB_ is at the driving voltage vdd (steps 8020-8022). At this point, the process ends. In an embodiment, the above step 8012 may include several Steps: Step 8102: Compare the feedback signal fb with the first reference voltage Vref1. If the feedback signal FB is greater than the first reference voltage v(10), perform step 81〇4; otherwise, perform step 8106. Step 8104: Reduce the driving voltage vDD. Step 8106: The boosting driving voltage In an embodiment, the above step 8014 can be replaced by the following steps: 1325285 /2-π Step 8202: The driving voltage VDD is divided to generate a voltage dividing driving power VM. Step 8204 And comparing the divided voltage driving voltage VM with the second reference voltage vref2. Step 8206: determining whether the divided voltage driving voltage is larger than the second reference voltage VreE. If the divided driving voltage VM is greater than the second reference voltage Vref2, performing steps 8016; otherwise, it will go to step 8014. Please note that the order of the steps in Figure 8 is not immutable. For example, step 8004 and step 8006 can be combined into the same step. The above described embodiment only uses The present invention is not limited to the scope of the present invention. The light-emitting devices 321-326 mentioned herein may include at least one light-emitting diode (LED)' and the number of light-emitting devices is not limited to six. Expanded to the number of other Φ. The current supply 331-336 can be a current sinking source, a current supply source, or other type of constant current supply. The second comparator c〇Mp2 It is not limited to a hysteresis comparator, but may be other comparators. In addition, the voltage conversion circuit 310 can be implemented by any conventional power supply, voltage regulator or driving chip of the light-emitting device. Note that the driving circuit 500 And the driving circuit 400 is only a modified embodiment of the driving circuit 300 shown in FIG. 3, wherein some components, such as a first resistor core, a second resistor r2, a power-on retarder 72〇, or a gate 73〇, and a switch 640 is only an optional component. The above embodiments are merely illustrative of the invention, and 20 1325285 is not limited to the practical application of the invention. Further, the order of the steps in Fig. 8 is adjustable. From the above, the present invention provides a drive circuit that provides feedback control and open circuit protection and related drive methods. Through the driving circuit disclosed in the present invention, not only the feedback signal FB can be controlled to provide a suitable driving voltage Vdd, but also the state of the lighting device can be detected. In particular, when the um circuit needs to drive a large number of illuminating devices, the present invention can provide a full driving voltage (foot current) to drive all of the illuminating devices. In addition, the selection circuit 35 〇 can be from the voltage level ν & ρ ΐ ~ ν fine %

The smallest voltage level is selected as the feedback signal FB, so that the power consumption of each of the 疋 current supplies 331-336 can be H. If any of the illumination devices are burnt (or open), the analysis age circuit 36Q will detect the open state and remove it from the selection circuit 35's option. Therefore, the entire system and its components can be prevented from being destroyed. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should fall within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view of a conventional driving circuit of the prior art. Figure 2 is a schematic diagram of another conventional drive circuit of the prior art. Fig. 3 is a view showing a drive circuit for providing feedback control and open circuit protection in the "first embodiment" of the present invention. 21 丄: > Ζ 3 Ζ δ;) Fig. 4 is a schematic diagram of the voltage conversion circuit in Fig. 3 '. ................. Fig. 5 is a schematic diagram of a driving circuit for the control and open circuit protection of the ^^Vt 1 J, < The figure is a schematic diagram of a drive circuit for providing feedback control and open circuit reduction in accordance with the third embodiment of the present invention. Fig. 7 is a view showing a drive circuit for providing feedback control and protection in accordance with the fourth embodiment of the present invention. ', Feedback Control and Open Circuit FIG. 8 is a schematic diagram showing a flow of a driving method for providing protection according to an embodiment of the present invention. [Description of main component symbols] 100, 200, 300, 500, 600 110, 210, 310 120'221-226 > 321-326 Driving circuit voltage conversion circuit light-emitting device 140, 240 light-emitting diode 130, 231-236, 331-336 constant current supply 112, 212, 312, 362 first input end 114, 214, 314, 364 second input end 116, 216, 316 round end Vin round wheel voltage FB feedback signal Vdd drive voltage Ic, II—Ιό, 111—】66 constant current 22 I1325285

:1 :,. '1. .. .: JA. ... , 1 Vf, Vfi—Vf6 Forward bias voltage Vdrop, Vdropl ~ Vdr〇p6 Voltage level \ VN Minimum voltage level 250'350 Selection circuit 360 Analysis And judgment circuit 381 - 386 open circuit detector 370 control logic SW1 - SW6, 640 switch Sdl ~ Sd6 detection signal Ssl - Ss6 switch control signal COMP2 second comparator SC2 second comparison signal Vref2 second reference voltage COMP1 first comparison Scl first comparison signal Vrefl first reference voltage 318 voltage conversion unit Ri first resistance r2 second resistance S〇 output signal Vm divided drive voltage 720 power on delay 730 or gate 800 flow 8002-8024 step 23

Claims (1)

Ft?, patent application scope: rh - a drive circuit capable of providing feedback control and open circuit protection 'The drive circuit includes: at least one light-emitting device; a voltage conversion circuit connected to the input end of the light-emitting device Providing a driving voltage to drive the light emitting device; an analyzing and determining circuit coupled to the light emitting device for determining whether the light emitting device is open to generate a determination result; at least one switch having a first end The output end of the illuminating device, a second end and a control end are coupled to the analysis and determination circuit. The open relationship controls the opening and closing according to the determination result to determine whether to output the output end of the illuminating device. a voltage level; and a selection circuit 'wheeled to the analysis and determination circuit, the second end of the switch, and the voltage conversion circuit to select a minimum voltage level from the received voltage level, And generating a feedback signal according to the selected minimum voltage level, and transmitting the feedback signal to the voltage conversion circuit, 5 Hyun transfer voltage, the driving circuit based on the voltage feedback signal to adjust. 2. The driving circuit as described in the patent application, wherein the illuminating device comprises at least one Light Emitting Diode (LED). 3. The driving circuit of claim 1, wherein the voltage conversion circuit 1325285 includes: a first comparator for comparing the feedback signal with a first reference voltage to output a The first comparison signal; and a voltage conversion unit coupled to the first comparator, the voltage conversion unit is configured to adjust the driving voltage according to the first comparison § hole. 4. The driving circuit of claim 3, wherein: when the feedback signal is greater than the first reference voltage, the first comparison signal output by the first comparator controls the voltage conversion unit To reduce the driving voltage; and when the feedback signal is less than the first reference voltage, the first comparison signal rotated by the first comparator controls the voltage conversion unit to increase the driving voltage. The driving circuit of claim 1, wherein the driving circuit further comprises: a first resistor coupled to an output end of the voltage converting circuit; and a first resistor connected to the first in series - Resistor; wherein 'the first-f (four) postal two resistors are turned on to divide the voltage to generate a divided voltage driving voltage. 6. The driving circuit of claim 5, wherein the analyzing and determining circuit comprises: 25 - a comparator - having a _ first-input terminal, the _th resistor and the first resistor a contact for receiving the divided voltage driving voltage, and a second input for receiving the H test voltage, the second comparison H side for comparing the divided drive voltage with the second reference voltage to generate a a second comparison signal; at least one open circuit detector 'the open circuit_device has a light input terminal connected to the light emitting device' and an output terminal for outputting a detection signal, the open circuit detector is used for detecting Detecting a state of the illuminating device; and a control logic, the handle being connected to the output end of the second comparator and the output end of the open circuit anger detector, the control logic is configured to use the second comparison signal and the detecting Signal to produce the result of the judgment. 7. The driving circuit of claim 6, wherein the second comparator is a hysteresis comparator (Hysteresis C〇mparator). 8. The driving circuit of claim 1, wherein: the second comparison signal output by the second comparator controls the opening of the driving circuit when the driving voltage is less than the second reference voltage. And the second comparison signal outputted by the second comparator controls the off corresponding state when the state of the illuminating device is greater than the second reference dragon and the state of the illuminating device is detected as an open circuit switch. 9. For the driving circuit described in claim 7 of the patent scope, wherein: 26 1325285, when the state of each illuminating device is detected as an open circuit, the control logic will 兮 授 Κ 务 务 在一 在一 在一Voltage level. 10. The driving circuit of claim 9, wherein the fixed electrical fault level comprises a driving voltage or a voltage level of the divided voltage. 11. A method for controlling a crane that can be shouted, the driving method comprising: providing a driving voltage to at least the input end of the lighting device to drive the lighting device 9 to determine whether the hair wire is open or not to produce a result Controlling at least the opening and closing of the switch according to the judgment result to determine whether to output a voltage level of the output end of the light emitting device; selecting a minimum voltage level from the received voltage level, and according to Selecting the minimum voltage level to generate a feedback signal; and adjusting the driving voltage according to the feedback signal. The driving method of claim 4, wherein the illuminating device comprises at least one light emitting diode. 27 丄 to 5285 adjust the driving voltage according to the first comparison signal. 4. The driving method of claim 13, wherein the step of comparing the feedback signal with the first reference voltage to adjust the driving voltage further comprises: when the feedback domain is large _ [When the voltage is referenced, reduce the tempo voltage; and when the homing is small (four) first - reference power (four), increase the shafting voltage. 15. The driving method according to claim n, wherein the driving method further comprises: dividing the driving voltage to generate a voltage-dividing driving electric castle. 16. The driving method of claim 15, further comprising: comparing the divided driving voltage with a second reference voltage to generate a second comparison signal; and measuring the state of the lighting device Taking a detection signal; and generating the determination result according to the second comparison signal and the detection signal. 17. The driving method of claim S, wherein the step of generating the determination result according to the second comparison signal and the side signal comprises: when the voltage division driving power (4) is smaller than the material reference, Corresponding to at least one switch of the illuminating device; and when the voltage dividing driving age is greater than the material reference and the state 28 of the illuminating device is detected as being open, the switch corresponding to the illuminating device is turned off. 18. The driving method of claim 16, wherein: when the state of each of the light-emitting devices is detected as an open circuit, the feedback signal is clamped to a fixed voltage level. 19. The driving method of claim 18, wherein the fixed voltage level comprises a voltage level of the driving voltage or the divided driving voltage. Η, round: 29 % |2/ Υ VII. Designation of representative figure: (―) The representative figure of this case is: (3 (2) This is a simple description of the symbol of the representative figure. 300 Drive Inductor 310 Voltage Conversion Circuit 321- 326 illuminating device 331-336 constant current supply 312, 362 first wheel 314, 364 second input 316 output VlN input voltage FB feedback signal 111 - 66 constant current Vdd drive voltage Vdropl - Vdr 〇 p6 voltage Level vN Minimum Voltage Level 350 Selection Circuit 360 Analysis and Judgment Circuit 381 - 386 Open Detector 370 Control Logic SW1 - SW6 Switch Sdl - Sd6 Detect Signal Ssl~ Ss6 Switch Control Signal COMP2 Second Comparator SC2 Second Comparison Signal Vref2 Second reference voltage 8. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: