TWI233113B - Control method and device for reducing power switching time - Google Patents

Abstract

The present invention relates to a control method and device, which provides two control circuits, and the first control circuit is used to output a stable control signal for making the output of the power output device at the target value; and the second control circuit is used for feedback control based on the output value of the power output device. There is provided with a switch to connect the power output device with the first control circuit at the beginning of connection for the power output device to receive the stable control signal, so as to output the target value in a short period of time. It is then switched to the second control circuit for feedback control on the power output device. The present invention could be applied for controlling the reading and writing power on the output of an optical reading and writing system, and for reducing the time of power switching at the beginning of switching to the reading and writing states, and further ensuring the accuracy of data reading and writing.

Description

Ϊ233113 A7

[Field of the Invention] The present invention is related to a control method and device for shortening the conversion power time, in particular, it provides two control lines to control one at each period; Turn it out, shorten the time of the power output device from the first to the f, St :, and apply the present invention to the "control" of the output of the optical reading and writing system, so that at the beginning of switching to the reading and writing state, that is, Can be two: production: target power value, to avoid the error caused by unstable reading and writing power at the beginning of power switching. [Background of the invention] Ο: Optical reading and writing systems, such as readable and write optical disc drives, are used in The laser light emitted by a laser diode on the head is used to produce small dents on a disc ^, and data can be recorded on the disc. 'When you want to read the data on the disc, you use it. The laser light emitted by the laser diode 'hits the disc, and reads the information on the disc according to the intensity of the reflected light generated. ILU β 1 „ It can be known from the above that whether the optical read-write system is correctly written or read on the optical disc by the science and technology department is subject to the intensity of the laser power emitted by the laser diode, so two automatic 3 rate control device to control the optical read-write system in the write state and the output state, respectively, in which the laser power emitted by the laser diode, to adjust the 20 write power and read power to-appropriate Value to ensure the correctness of reading and writing data. > * The automatic power control devices for reading and writing are the same, so here we will take the automatic power control device as a representative description below. Referring to the first picture, the general automatic power control device 3 is separately used to drive a laser.

Page 4Ϊ233113 A7 B7 V. Description of the invention (2) '-the driving chip 2 of the diode 1 and a diode for detecting the laser diode 丨 the read power actually emitted is set before the light diode The body 5 is connected, and the device 3 has a digital / analog converter 3 丨, a feedback controller 32 switchably connected to the digital / analog converter 31, and an input of 5 connected to the feedback controller. Ended gain element 33. The designer inputs the set read power into the digital / analog converter 31 to set the read power of the optical read-write system at a predetermined value, and converts the digital read / write system 31 into an analog signal through the digital / analog converter 31. When the user switches the switch 2 1 on the driver chip 2 to the off state (even if the driver chip 2 is on), the reading function of the optical system is activated, and the digital / analog converter 31 is connected to the switch by the switch 311. The feedback controller 32 outputs an analog signal to the feedback controller 32, so that the feedback controller 32 outputs a control signal to the driving chip 2 according to the preset value set, and then drives the laser diode by the driving chip 2.丨 However, since the actual laser power emitted by the driven laser diode i is not ideally equal to the predetermined reading power rate of 15 ', the actual laser must be further irradiated by the front light diode 5. The power is converted into an electric signal, which is amplified by the gain element 33, and then fed back to the feedback controller 32 'to automatically feedback and adjust the output control signal according to the actual laser power until the actual output of the laser diode 1 reaches a predetermined value. Up to the power value. The components and control processes of the feedback controller 32 in the automatic power control device 3 are described below. As shown in the first figure, the feedback controller 32 is composed of an amplifier 321 and a capacitor 322. The capacitor 322 is connected between the inverting input terminal 323 and the output terminal 325 of the amplifier 321. Therefore, it is formed on the amplifier 321. A negative feedback loop. As for the control process of the feedback controller 3 2, please refer to the first and second figures at the same time, and explain that the paper size is applicable to the Chinese National Standard (CNS) A4 specification (21 × 297 mm) GC3346 m 1233113 A7 ____ B7 5. Description of the invention)-Next. The first thing to know is that those who are familiar with this technique know that when the optical reading and writing system switches to the reading state at time T0, the delay time between this switch and U and 3U switches is the same as when switching. The Z image is not the focus of the following discussion. Therefore, in the following description, the delay caused when the switches 21 and 35 are switched is ignored. Therefore, the digital / analog converter outputs the analog signal at time το, and a delay time 7 (1) required for charging by the pin of the non-inverting wheel input # 324 (1, the output signal of the wheel 321 will output the control signal, so At time T1, the output of the amplifier 321 will output a control signal to drive the driver chip 2 to drive the laser diode 丨 to output 10 power, which is simultaneously generated by the actual power detected by the front photodiode 5 : No., feedback to the inverting input terminal 323 of the amplifier 321, and then compare the difference between the feedback signal and the non-inverting input terminal 324 to receive the analog signal output by the digital / analog converter 31 through the amplifier, so that the The capacitor 322 performs charging and discharging, and adjusts the output control signal. Until time T2, the electric signal that is fed back to the 15 amplifier 32! Will be equal to the set analog signal, and the laser diode ^ 1 will not be output until this time. A stable power, so between time τ0 and T2, 疋 switches to the initial state of reading state, between time τ0 and T i, device 3 does not have any signal output, until time T1, device 3 will have a control signal $ Out, its output control The signal is a 20 trend change shown by curve A or 8 in the second figure; if the set reading power is greater than the required reading power, the signal output by the amplifier 321 is within the time from T1 to T2. If the set reading power is less than the required reading power, the signal output by the amplifier 321 within the time from "to T2" is shown in curve B in the second chart. Trend, and the second figure shows that

Page 6 ^ 33113

In the initial stage of the description of X invention, after the delay, the capacitor 322 of the loop has a negative feedback control on the right-handed amplifier 321, but the charge and discharge are adjusted, and the output control signal is adjusted to a stable output. Therefore, it is controlled between time T1 and T2. Laser Diode Power 1 Polar body 1 system Λ bl is a trend of curve A or B, resulting in laser 2 = the output power will also change accordingly, so between 1 to T2, it will form There is a transient period of unstable output power. Continued, 耷 Γ: The narrative shows that—the automatic power control device 3, which is generally used to control the second rate of the optical read-write system, uses the current common power of 10%: at the beginning of the switch, The output initial control signal is not equal to the control signal that can reach the rate: target value, and is even rounded ^ in 屮, ^ The automatic control signal 3 is used to adjust the initial control signal j and control the flood signal. 'And the automatic power control device 3 is adjusted ^ It is necessary to enter the feedback loop to charge and discharge the capacitor W, such as 20 1 5 set to 3, Qu: Ren will be in the initial period of switching to read and write state, the device is generated by the device The shortcomings of 3 L late output control signal shore # The delay caused by the sluggish, write power delay output caused a transient period of power conversion, and during this transient period, the read and write slices did not reach the target value and the power was not Stability, will lead to the wrong material in the disc and misjudge the data on the disc. [Summary of the invention] Therefore, the first object of the present invention is to provide a power control method to reduce the time required for the power output device to convert power. The second object of the present invention is to provide a power control device. The time for the power output device to change power. A third object of the present invention is to provide a power of 1233113 A7.

1233113 V. Description of the invention (6 Then switch to the second control circuit, according to this: adjust the power output device: the second line, the reading of the unified output 'can be used to control the reading and writing of the optical reading and writing system period: rate target Value, to avoid the initial [solid form of simple: two] stability, resulting in the lack of reading and writing data errors. Other features and advantages of Jiayouyue are described in the following detailed description of the preferred embodiment with reference to the drawings. Compared with 10, the circuit diagram of the automatic power control device and the reading ... of the optical reading and writing system like Γ, and the peripheral components are connected; y !: Figure t—the output signal and time of the automatic power control device, & amp The axis time is the output of the automatic power control device: the signal output from the 15th dynamic power control device at the beginning of the optical read-write system's switching to the reading state; the figure shows the optical reading of the present invention The circuit diagram of the preferred embodiment of the power control device of the writing system illustrates the circuit diagram of the present invention installed on the reading head for controlling the reading power. The fourth figure is the power control of the optical reading and writing system of the present invention. The control flow chart of the 20 embodiment of the device is preferably implemented; and the fifth diagram and the second diagram are not intended to show the relationship between the output power of the laser diode and time, the time axis is the time axis, and the vertical axis is the laser diode output The power indicates the laser power output by the laser diode during the control process of the power control device of the present invention.

1233113 V. Description of the invention (7) [Detailed description of the invention] As shown in the third figure, the power control device 7 of the present invention is provided on the reading head of a digital audio-visual disc player that can read the data of the optical disc and is connected with The drive chip 2 for driving the laser diode i and the front photodiode 5 on the read-write head are connected to the above-mentioned components, and the related functions have been described in the conventional technology. For explanation, I won't go into details here. The power control device 7 of the present invention includes a feedback control unit 71, a gain amplifier 73 for a gain element, a switch for an analog switch, a switching switch 72, and a digital / analog converter 74 as a predetermined power supply unit. And a second gain amplifier as an amplifying element. This preferred embodiment is only one of the specific embodiments of the present invention. The present invention can also omit the second gain amplifier 75, and also achieve the purpose of the present invention. Therefore, the present invention does not implement you in this preferred embodiment. Gen. In order to describe each constituent element of this embodiment in detail, 1 5. The feedback control unit 71 includes an amplifier 711, a feedback capacitor ci connected between the inverting input terminal 712 and the output terminal as the first input terminal of the amplifier 711, and a connection between the second gain amplifier 715 and the inverting input terminal 712. The first resistor R1 and the second resistor R2 connected between the inverting input terminal η] and the output terminal 714. The gain value of the amplifier 31 is r2 / Ri and the amplifier 711 serves as the second input terminal. The non-inverting input terminal 713 is switchably connected to an output terminal of the digital / analog converter 74. Furthermore, the second gain amplifier 75 is connected between the inverting input terminal 712 of the amplifier 31 and the front photodiode 5. The output end of the gain amplifier 73 is compatible with the Chinese National Standard (CNS) A4 specification (210x 297). Page 10 1233113 V. Description of the invention (8) The driver chip 2 is connected to the input terminal and the switch 72 The connection change switch 72 can be connected to another input of the digital / analog converter 74: the changeover switch 72 is in a state shown by a solid line in the third figure), forming a first connection formed by the digital / analog converter 74 and the gain amplifier 73. _Control, in addition, the switch 72 can be switched to be connected to the amplifier 7: terminal = the switch 72 is in the state shown by the imaginary line in the third figure), =

The second control circuit composed of the second money adding device 75 and the feedback control unit W amplifier 73 connected in sequence enables the present invention to have two control circuits. Clothing set 10 Liguang =! As shown in Figures 3 and 4 of “Reading Lightning 1”, the digital video is controlled by device 7. The laser on the disc player reads the data from the laser. The first step is to produce digital video discs. In the process of the machine, before the step: i8 set the gain value of the gain amplifier 73, the way of setting the gain value is the output of the 15 measurement device 7-the control signal value ss, the signal value ~ is to make the laser ▲ two poles body! The output is the required target power value, and then the power required by the designer to take the data is rounded into the digital / analog converter% digitally converted: the predetermined signal value Si output after the comparison, and the gain is determined The value is equal to the above-mentioned stable control signal value divided by the predetermined signal value. The reading data estimated by the above designer: the required power is based on the type and speed of the reading disc, and then 'in step 82, the switch is connected to the _ output of the analog converter 74 End, make the device 7 form the first control—when the above-mentioned digital video disc player is completed, when the user has not used it, the switch 21 on the driving chip 2 is in the open state, and at the same time, it enlarges ⑽x 2ba) Page 11 1233113 A7 '_______B7 V. Description of the invention (10) After a predetermined time Td, step 85 is performed, and the control switch 7 is switched to the output terminal 714 of the amplifier 711, so that the device 7 is switched to the second control line, and then step 86 is performed. The laser power output is controlled by the second control circuit. At the beginning of the second control circuit, the amplifier 7 丨 丨 immediately outputs 5 predetermined signal value Si, and at the same time, it is amplified by the gain amplifier 73 to output a predetermined flood value Si multiplied by the above. The gain value (Ss / Si) is the stable control signal value Ss, and the laser diode 1 maintains the output at a predetermined target power value, and then performs the phase comparison with the automatic power control described in the conventional art. Feedback control, that is, using the light diode 5 to convert the read power of the detected laser diode 丨 to an electrical signal and output it to the second gain amplifier 715 to amplify the electrical signal Feedback to the inverting input terminal 712 of the amplifier 711, and then compare the difference between the feedback signal and the predetermined signal value received by the non-inverting input terminal 713 through the amplifier 711 to charge and discharge the feedback capacitor c 丨Change the output control signal and adjust the output power of the laser diode, that is, 15 enters the same feedback control stage as the general automatic power control device. During the reading process, the temperature drift changes, and the output power is fine-tuned, so that Appropriate reading power. When the user wants to end the reading state of the digital video player, switch 21 is turned on, and the non-inverting input terminal 20 7 1 3 of the amplifier 711 is switched to ground to make the digital If the video disc player enters the non-reading state, it will proceed to step 82 to switch the power control device 7 to the first control line. In order to enable a clearer understanding of the control of the power control device 7 In the process, the first and second control circuits shown in the fifth figure and the control timings of switching the read state Pel, Pu, R are described, and each process of the above process 8 is explained, and cooperated with

Page 13 1233113 V. Description of the invention (11) Ding Chu is controlling over-privilege, and the laser diode outputs laser power. Similarly, the power umbrella in this example is approved by the knife hand control device 7 and the switch. 21 switching, and non-inverting input terminal 71 3 switching remote technology $ slave 7 7 When it is connected to the digital / analog converter 74, it is also the same as the conventional technique. 'There will be a delay in switching. In this & example control over-private explanation, the delay phenomenon of switch switching is also ignored, and the laser power output shown in the fifth figure described below is shown. When the time π == the audio CD player is not in the state of reading data, the power control device 7 is in the first control circuit-like clock Pcl is located at the high level of the first control circuit. Diode 1 does not output any = rate, that is, the initial value of the output is zero. When at time τ. Switch to reading Π: the beginning of the knife, that is, the reading clock R in the figure enters the high level state, and the device still remains in the first control line state, that is, the control time level state, then the first protection system , 1 is still in the same motion ... 丄: Output stability control signal value Ss to drive 15 ;; τ laser diode 1 round out-target power value-time T1 after predetermined time Td, this device is pre-set疋 I controls the clock PC1 to change to the low-level quasi-energy n ±. A control circuit, that is, the quasi-energy can simultaneously control the clock L to enter the high-early state, then the second control line q 佴 degree changes, the laser power, As the temperature changes or other factors change, adjust the laser diode =, so after time T1, the power curve of laser diode 1 output: ::: international conditions and slightly changes at different times, but in Time T1: the meaning after power control m μ n '. Therefore, the fifth figure is shown by the imaginary line. From the fifth figure, it can be seen that the switch to the reading state is between η, which is equivalent to the general power input setting period (that is, the time το the time when the switching device is switched off). State period, (210χ 297 mm) Page 14 Guanjia Standard (CNS) A4 gauge tile 1233113 V. Description of the invention (12 The #rate control setting in this month is not controlled by feedback control to adjust the output flood Blind, and the first control line outputs a stable control signal value, so that the digital video disc player immediately outputs a stable target power value P, which can avoid the power switching by the conventional automatic power control split during the initial period of switching The shortcomings of the delayed power output and the long transient period formed in the conventional power control process lead to the instability of the laser power output during the transient period, resulting in the lack of misjudged data.除了 In addition to the above-mentioned preferred embodiments, the present invention is used to control digital video "films :::::: rate 'can also be used to control the recorder to write the data to the first and the above control. ,,, Tian narrative, and also in cut False = :? Initial 'round out-stable laser power, avoid writing data 15 power method, can be applied to a variety of power output devices available ^ shows the digital video CD player, burner described above, more Mengjin :: Beam and writable optical disc drive. By the invention, at the beginning of such power output: set switching, that is, a control signal is produced by rotating a control signal to make the power output device equal after the switch: = Control = The power output device controlled by the control device is learned one by one. 2. In the transient state, the power can be output immediately and steadily to avoid the related problems caused by the dichotomous. Invented the method to shorten the time to change the power and put it on. "Use the two control circuits' in each period with-fit, install, power wheel out device spleen ^. RA field circuit control set the output of the first-control circuit as Make power l233ll3

Set the stable control signal of the output target value, so that at the beginning of switching-control of the control circuit, the wheel of the power wheel output device ° The power change trend in the transient period described in the description of the technical know-how: will show ij to the target value, Shorten the time of power conversion, 1 = 2: Guangzhi reading nest j; /; seat dipping: seat 丨 L at the initial period of 7 ^ 5 to buy and write silk, ':: optical reading and writing system switched to reading and writing The state / M laser-polar body can stably rotate out with the power of the target value, avoiding errors in reading and writing data, and indeed achieves the purpose of the present invention.

Those mentioned above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, simple equivalent changes and modifications made in accordance with the scope of patent application 10 of the present invention and the contents of the invention specification , All should still fall within the scope of the invention patent.

Page 16 1233113 A7 B7 V. Description of the invention (14) [Comparison of component numbers] 7 Power control device 7 1 back 7 11 Amplifier 712 Invert 713 Non-inverting input 714 Input 75 Second gain amplifier C1 Back to R1, R2 First % Two resistors 72 changeover switch 73 increase 74 digital / analog converter 5 front 2 driver chip 1 lightning control unit phase input terminal output capacitor gain amplifier light diode diode diode PP degree Applicable to China National Standard (CNS) A4 size (210x 297 mm) " Page 17

Claims (1)

1233113 A8 1233113 VI. Application for patent scope 5. = Application: shorten the conversion power time as described in item 3 of the scope of interest = Zhong Qiguang in the initial period 'is the beginning of writing one of the states of the μ-learning system. 6. Please request the reduction of the conversion power time as described in item 2 or 3 of the patent scope. Among them, the stable control signal output by the first control line ΐ the control signal is formed by-gain value amplification, the preset control: 1 ^ ^… A predetermined power supply unit π in the pre-write system is set according to the read and write power required by the optical read-write system early and read and write i # acoustic storage media type and write speed, The gain value B is divided by the stable control signal by the preset control signal.疋 Please control the method of shortening the conversion power system according to item 1 or 2 or 3 or 4 or 5 of the patent scope, wherein the second control circuit is to change the stable control signal according to the power of the power control output power. Output power ❶ 扪 8. An estimate of shortening the conversion power time dream f is used to control the output value of the power output device to make the power output change rapidly to a target value. The device contains The first control circuit outputs a stable control signal of the threshold value; the second control circuit of the output wheel is the second control circuit to adjust the output work of the power output device according to the power feedback control = value input = switch replacement. Turn off the power at the power output device: output device to the-control line, install the power output =… period 'the-control line outputs a stable control signal, so that = applies to Chinaϋϋ 297 03360 page 19