CN104036749A - LCD (liquid crystal display) power circuit with temperature compensation - Google Patents
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Abstract
The invention provides an LCD (liquid crystal display) power circuit with temperature compensation. The LCD power circuit comprises a data acquisition module, a data processing module, a microprogrammed control unit (MCU) and an integrated voltage stabilizing circuit, wherein the data acquisition circuit is used for acquiring temperature information of the periphery of an LCD; the data processing module is used for comparing the temperature information with self-stored preset temperature value to acquire comparative results; the MCU is used for receiving the comparative results through a feedback network so as to generate control commands according to the comparative results; the integrated voltage stabilizing circuit is used for regulating output voltage according to the control command so as to power driving voltage. By the arrangement, the output voltage of the integrated voltage stabilizing circuit powering the driving voltage can be regulated by sensing the temperature of the periphery of the LCD, so that the driving voltage is enable to be operated in a suitable range, liquid crystal can be therefore operated in a suitable temperature range, the LCD can be normally operated, and the function of the temperature compensation can be realized.
Description
Technical field
The present invention relates to field of liquid crystal, in particular to a kind of LCD power circuit with temperature compensation.
Background technology
The features such as that liquid crystal display LCD has is low in energy consumption, sharpness is high, the life-span is long, volume is little, lightweight, good optical properties, are desirable display devices, are widely used on various instrument and meters.Wherein, the index of evaluating liquid crystal display mainly contains threshold voltage, contrast, visual angle and response characteristic etc., wherein the most important thing is the response characteristic of liquid crystal display.
Liquid crystal display is the change based on liquid crystal molecule state, it is a kind of process of molecular motion, its response speed nature is than atom process or slow many of electronic processes, but liquid crystal molecule be no matter uphill process (being that LCDs is from dark to bright state) or decline process (be LCDs from bright to by state), be all to overcome resistance and process that liquid crystal molecule state is changed by power.Therefore, no matter its response time of device which kind of liquid crystal electrooptical effect is made and the relation of temperature are all as shown in Figure 1, the brightness that can find out backlight is the highest in the time that temperature is 50 DEG C, along with the environment temperature of liquid crystal display reduces, liquid crystal viscosity increases, under same drive voltage, the liquid crystal response time is elongated gradually; Wherein, the rise time that T r is liquid crystal display, the fall time that T d is liquid crystal display.
At present, Source Driver IC (source drive IC), by the computing to AVDD, VCOM, GAMMA, forms gray scale voltage.Taking the panel of 8bit as example, meet together and produce 256 gray scale voltage GAMMA1～GAMMA256.In the time that the environment temperature of LCD changes, identical gray scale voltage will be different to the deflection angle of liquid crystal molecule, cause LCD display brightness and contrast to change, and being embodied on Gamma gray scale curve is Gamma gray scale curve off-design value.In the time that environment temperature is brought down below 0 DEG C, liquid crystal material will become viscous, cause its response speed slack-off, and now, the dynamic image in liquid crystal display there will be conditions of streaking even can not show; If environment temperature is too low, liquid crystal state will disappear, and becomes crystal, and liquid crystal display is blank screen directly, and when environment temperature is during lower than 0 DEG C, also can make the fluorescent tube life-span of backlight reduce, and low temperature can reduce the brightness of backlight.
Summary of the invention
The object of the present invention is to provide the LCD power circuit with temperature compensation, to solve the above problems.
A kind of LCD power circuit with temperature compensation is provided in an embodiment of the present invention, has comprised:
Data acquisition module, for gathering liquid crystal display temperature information around;
Data processing module, for the preset temperature value of temperature information and self storage is compared, obtains comparative result;
Micro-control unit MCU, for receiving comparative result by feedback network, and generates steering order according to comparative result;
Integrated voltage-stabilized module, for regulate its output voltage according to steering order, thinks driving voltage power supply.
Further, in this circuit, feedback network is made up of negative-feedback amplifier and totalizer, comprising: operational amplifier, be connected to the non-reversal amplifier between ground wire and the output terminal of operational amplifier and be connected to the output terminal of operational amplifier and the resistance R x of the in-phase input end of non-reversal amplifier.
Further, in this circuit, non-reversal amplifier comprises: operational amplifier, be connected to the resistance R x between the inverting input of operational amplifier and the output terminal of operational amplifier and be connected to ground wire and the inverting input of operational amplifier between resistance R x.
Further, this circuit also comprises the driving circuit for drive liquid crystal display work according to the output voltage of integrated voltage-stabilized module; Driving circuit comprises the K switch 1-K switch 256 being connected in parallel with data processing module;
The corresponding controlling resistance R1-of K switch 1-K switch 256 resistance R 256; Wherein, resistance R 1-resistance R 256 is connected in series; K switch 1-K switch 256 is all connected with the in-phase input end of operational amplifier; Resistance R 1-resistance R 256 is all connected with the in-phase input end of operational amplifier.
Further, this circuit also comprises analog to digital converter;
Analog to digital converter is connected with data processing module with data acquisition module respectively, for converting the simulating signal of data collecting module collected to digital signal, and is sent to data processing module.
Further, this circuit also comprises the adjustable output circuit of transformation;
The adjustable output circuit of transformation is connected with integrated voltage-stabilized module, is used to integrated voltage-stabilized module that output voltage is provided.
Further, in this circuit, the adjustable output circuit of transformation is the adjustable output circuit of three end transformations, comprising: the transformer L1 being connected with power supply and the rectifier bridge stack UR being connected with transformer L1;
The first input end mouth of rectifier bridge stack UR is connected with the first output port of transformer L1; The second input port of rectifier bridge stack UR is connected with the second output port of transformer L1; Rectifier bridge stack UR is connected with integrated voltage-stabilized module.
Further, the adjustable output circuit of transformation also comprises: the second filter network that is connected to the first filter network between rectifier bridge stack UR and integrated voltage-stabilized module and is connected with integrated voltage-stabilized module;
The first filter network comprises: be connected in capacitor C 1 and capacitor C 4 between the outbound port of rectifier bridge stack UR and the input port of integrated voltage-stabilized module in parallel; The second filter network comprises: be connected in capacitor C 2 and capacitor C 3 between output port and the ground wire of integrated voltage-stabilized module in parallel.
Further, this circuit also comprises electric battery;
Electric battery is connected with integrated voltage-stabilized module, is used to integrated voltage-stabilized module that power supply is provided.
Further, in this circuit, data acquisition module is temperature sensor; Data processing module is for selecting comparer.
The LCD power circuit of temperature compensation that what the embodiment of the present invention provided have, while being brought down below 0 DEG C with the environment temperature when liquid crystal display of the prior art, liquid crystal material will become viscous, cause its response speed slack-off, now, dynamic image in liquid crystal display there will be the scheme that conditions of streaking even can not show etc. to compare, and it comprises: data acquisition module, for gathering liquid crystal display temperature information around; Data processing module, for the preset temperature value of temperature information and self storage is compared, obtains comparative result; Micro-control unit MCU, for receiving comparative result by feedback network, and generates steering order according to comparative result; Integrated stable voltage circuit, for regulate its output voltage according to steering order, thinks driving voltage power supply.The present invention can be adjusted to by induction liquid crystal display temperature around the output voltage of the integrated stable voltage circuit of driving voltage power supply, thereby make within driving voltage is operated in suitable scope, and then within ensureing that liquid crystal is operated in suitable temperature range, therefore liquid crystal display can normally be worked, and realizes the function of temperature compensation.
Brief description of the drawings
Fig. 1 shows liquid crystal display response time that the embodiment of the present invention provides and the graph of a relation of temperature;
Fig. 2 shows the structural representation of a kind of LCD power circuit with temperature compensation that the embodiment of the present invention provides;
Fig. 3 shows the structural representation of the adjustable output circuit of transformation that the embodiment of the present invention provides;
Fig. 4 illustrates the structural representation of the circuit of the Gamma that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the present embodiment, the technical scheme in the present embodiment is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of LCD power circuit with temperature compensation, as shown in Figure 2, comprising: data acquisition module 11, for gathering liquid crystal display temperature information around; Data processing module 13, for the preset temperature value of temperature information and self storage is compared, obtains comparative result; MCU (Micro Control Unit, micro-control unit), for receiving comparative result by feedback network, and generates steering order according to comparative result; Integrated voltage-stabilized module, for regulate its output voltage according to steering order, thinks driving voltage power supply.
The LCD power circuit of temperature compensation that what the embodiment of the present invention provided have, while being brought down below 0 DEG C with the environment temperature when liquid crystal display of the prior art, liquid crystal material will become viscous, cause its response speed slack-off, now, dynamic image in liquid crystal display there will be the scheme that conditions of streaking even can not show etc. to compare, and it comprises: data acquisition module 11, for gathering liquid crystal display temperature information around; Data processing module 13, for the preset temperature value of temperature information and self storage is compared, obtains comparative result; Micro-control unit MCU, for receiving comparative result by feedback network, and generates steering order according to comparative result; Integrated stable voltage circuit, for regulate its output voltage according to steering order, thinks driving voltage power supply.The present invention can be adjusted to by induction liquid crystal display temperature around the output voltage of the integrated stable voltage circuit of driving voltage power supply, thereby make within driving voltage is operated in suitable scope, and then within ensureing that liquid crystal is operated in suitable temperature range, therefore liquid crystal display can normally be worked, and realizes the function of temperature compensation.
In the present embodiment, data acquisition module 11 can be temperature sensor; Data processing module 13 is for selecting comparer.The temperature information of the environment in the temperature sensor Real-time Collection liquid crystal display external world, and the temperature information collecting is sent to selection comparer; In the present embodiment, the temperature value when preset temperature value prestoring in selection comparer is liquid crystal display cisco unity malfunction (for example, 0 DEG C), select comparer that the temperature value of the temperature information receiving and its cisco unity malfunction of self prestoring is compared, when the temperature information receiving is during lower than this preset value, by feedback network by signal by single-chip microcomputer Real-time Feedback to integrated voltage-stabilized module; Wherein, integrated voltage-stabilized module can be U1 chip, concrete, and U1 chip can be the chip of W7805 model.In addition, it should be noted that, select the preset temperature prestoring in comparer to arrange according to user's needs.
Concrete, MCU can use single chip computer AT 89C51; Steering order be generate according to temperature information make integrated voltage-stabilized module output voltage raise signal; Integrated voltage-stabilized module, according to this signal of receiving, regulates the output voltage of self, and then makes within driving voltage is operated in suitable scope, and then within ensureing that liquid crystal is operated in suitable temperature range, realizes the function of temperature compensation.It should be noted that to be in addition, the present invention is not restricted to model and the classification of MCU.
Further, as shown in Figure 2, in this circuit, feedback network is made up of negative-feedback amplifier and totalizer, comprising: operational amplifier, be connected to the non-reversal amplifier between ground wire and the output terminal of operational amplifier and be connected to the output terminal of operational amplifier and the resistance R x of the in-phase input end of non-reversal amplifier.
Concrete, use that operational amplifier composition feedback network can amplify to the received signal, precision rectifying and filtering etc., so that follow-up, the signal receiving is fed back to integrated voltage-stabilized module accurately by MCU; Wherein, resistance R x can be preferably adjustable resistor, and the resistance of resistance R x can arrange as required arbitrarily.
Further, as shown in Figure 2, in this circuit, non-reversal amplifier comprises: operational amplifier, be connected to the resistance R x between the inverting input of operational amplifier and the output terminal of operational amplifier and be connected to ground wire and the inverting input of operational amplifier between resistance R x.
Resistance R x in the present embodiment is preferably adjustable resistor equally.Concrete, make two Rx in the present embodiment all equate (three Rx all equate) with the Rx in last embodiment, now two operational amplifier both end voltage equate, have so just formed a feedback network.
Further, as shown in Figure 1, this circuit also comprises the driving circuit for drive liquid crystal display work according to the output voltage of integrated voltage-stabilized module; Driving circuit comprises the K switch 1-K switch 256 being connected in parallel with data processing module 13; The corresponding controlling resistance R1-of K switch 1-K switch 256 resistance R 256; Wherein, resistance R 1-resistance R 256 is connected in series; K switch 1-K switch 256 is all connected with the in-phase input end of operational amplifier; Resistance R 1-resistance R 256 is all connected with the in-phase input end of operational amplifier.
Concrete, resistance R 1-R256 preferably uses adjustable resistor.Because the multiplexing mode of multilevel resistance is generally taked in the generation of Gamma voltage, so allow adjustable resistance R1-R256 correspondence each Gamma voltage, and controlling resistance Rx changes according to temperature variation, present linear relationship, therefore can obtain different magnitudes of voltage by integrated circuit modules (being W7805), thereby realize the compensation of temperature.
Further, as shown in Figure 2, this circuit also comprises analog to digital converter 12; Analog to digital converter 12 is connected with data processing module 13 with data acquisition module 11 respectively, converts digital signal to for the simulating signal that data acquisition module 11 is gathered, and is sent to data processing module 13.
Concrete, the temperature information that data acquisition module 11 (being temperature sensor) gathers is simulating signal, and analog to digital converter 12 converts simulating signal to digital signal, and object is that the antijamming capability of digital signal is strong.Because twice conversion carried out in the transmission of simulating signal, so signal exists certain distortion, and convert thereof into digital signal, avoid the existence of this situation.
Further, as shown in Figure 3, this circuit also comprises the adjustable output circuit of transformation; The adjustable output circuit of transformation is connected with integrated voltage-stabilized module, is used to integrated voltage-stabilized module that output voltage is provided.
Further, as shown in Figure 3, in this circuit, the adjustable output circuit of transformation is the adjustable output circuit of three end transformations, comprising: the transformer L1 being connected with power supply and the rectifier bridge stack UR being connected with transformer L1; The first input end mouth 11 of rectifier bridge stack UR is connected with the first output port 3 of transformer L1; The second input port 8 of rectifier bridge stack UR is connected with the second output port 4 of transformer L1; Rectifier bridge stack UR is connected with integrated voltage-stabilized module.
Concrete, transformer L1 is for supply voltage being converted to the voltage that is applicable to liquid crystal display work, in order to ensure that liquid crystal display normally works, and can not cause damage to liquid crystal display.Rectifier bridge stack UR becomes direct current by the alternating current of supply voltage, in order to supply with integrated voltage-stabilized module, liquid crystal display is normally worked.
Wherein, transformer L1 can use the transformer of 119LNS model; Rectifier bridge stack UR can use the rectifier bridge stack of BR805 model.But above-mentioned transformer L1 and rectifier bridge stack UR are not limited to above-mentioned model and classification.
Further, as shown in Figure 3, the adjustable output circuit of transformation also comprises: the second filter network that is connected to the first filter network between rectifier bridge stack UR and integrated voltage-stabilized module and is connected with integrated voltage-stabilized module; The first filter network comprises: be connected in capacitor C 1 and capacitor C 4 between the output port 9 of rectifier bridge stack UR and the input port 5 of integrated voltage-stabilized module in parallel; The second filter network comprises: be connected in capacitor C 2 and capacitor C 3 between output port 7 and the ground wire of integrated voltage-stabilized module in parallel.
Concrete, the first filter network, for to carrying out filtering through the DC voltage of rectifier bridge stack UR, passes through the signal of predeterminated frequency smoothly, and the signal (being greater than or less than the signal of predeterminated frequency) that suppresses other a part of frequency passes through; Wherein the signal of predeterminated frequency is the signal of the frequency that makes the normal work of liquid crystal display; This predeterminated frequency can arrange according to real needs.
Further, this circuit also comprises electric battery; Electric battery is connected with integrated voltage-stabilized module, is used to integrated voltage-stabilized module that power supply is provided.
Concrete, the present invention also can use electric battery for integrated voltage-stabilized module provides power supply, uses electric battery simpler and convenient.
Background to the LCD power circuit with temperature compensation provided by the invention and design concept are carried out entirety introduction below:
The features such as that liquid crystal display has is low in energy consumption, sharpness is high, the life-span is long, volume is little, lightweight, good optical properties, are desirable display devices, are widely used on various instrument and meters.Liquid crystal display is a kind of passive demonstration, and itself can not be luminous, can only rely on the light of surrounding environment to show.It only needs just energy display pattern or character of very little energy.Just because of low-power consumption and miniaturization make LCD become preferably display mode.
Liquid crystal display liquid crystal material used is a kind of organism that has liquid and solid double properties concurrently, and its club shaped structure is generally arranged in parallel in liquid crystal cell, but can change its orientation under electric field action.For positivity TN-LCD, when not powering up while being pressed onto electrode, LCD is in " OFF " state, and luminous energy sees through LCD and is white state; When add voltage on electrode time, LCD is in " ON " state, and long axis of liquid crystal molecule direction is arranged along direction of an electric field, and light can not see through LCD, darkly state.On electrode, apply selectively voltage, just can demonstrate different patterns.TN pattern can be used to make the liquid crystal display with features such as low-voltage, low-power consumption, long-lives, is most widely used a kind of pattern in various mode of operations.
Liquid crystal display is one and in box, is filled with liquid crystal by upper and lower two liquid crystal cells that electro-conductive glass is made, encapsulant for surrounding-glue frame (being generally epoxy resin) sealing, and polaroid is posted in two outsides of box.Interval in liquid crystal cell between upper and lower glass sheet, usually said box is thick, is generally several microns (people's accuracy diameter is tens microns).Upper and lower glass sheet inner side, the part of corresponding display graphics, is coated with transparent oxidation pasture-tin oxide (being called for short ITO) conductive film, i.e. show electrode.The effect of electrode is mainly to make external electric signal be added to liquid crystal by it to get on.In liquid crystal cell, the whole viewing area of glass sheet inner side is covered with one deck oriented layer.The effect of oriented layer is that liquid crystal molecule is arranged by specific direction, and this oriented layer is skim macromolecule organic normally, and through friction treatment, also can be by preparing with vacuum evaporation silicon oxide film at a certain angle at glass surface.In TN type liquid crystal display, be filled with positivity nematic crystal.The orientation of liquid crystal molecule is exactly to make the liquid crystal molecule of long excellent type be parallel to glass surface to arrange along a fixed-direction, and the direction of molecular long axis is along the direction of directional process.The orientation direction of upper and lower glass surface is orthogonal, like this, in the direction perpendicular to glass sheet surface, the orientation distortion gradually of liquid crystal molecule in box, from upper glass plate to the distortion of lower-glass sheet 90 °, the origin of Twisted Nematic LCD title that Here it is.
The index of evaluating liquid crystal display mainly contains threshold voltage, contrast, visual angle and response characteristic etc., wherein the most important thing is response characteristic.Liquid crystal display is the change based on liquid crystal molecule state, because of but a kind of molecular process, its response speed nature is than atom process or slow many of electronic processes.But no matter being uphill process or decline process, is all a process that overcomes resistance by power and liquid crystal molecule state is changed.Therefore,, no matter the device which kind of liquid crystal electrooptical effect is made, its response time T is as shown in the formula expression:
T
r＝η
id
2[ε
0Δ
εV
2-K
iiπ
2]
-1＝η
i[ε
0Δ
εE
2-K
iiq
2]
-1
T
d＝η
id
2[π
2K
ii]
-1
Wherein Tr is the rise time (time of liquid crystal display from dark to bright needs) of liquid crystal display; Td is the fall time (times of liquid crystal display needs from bright to dark) of liquid crystal display; η is the anisotropy coefficient of viscosity of liquid crystal display material; Kii is three kinds of deformation behavior constants of liquid crystal material; Δ ε is the dielectric anisotropy of liquid crystal material;
For above problem, the present invention proposes a kind of implementation method of the LCD power circuit with temperature compensation.Show according to test, the brightness of backlight is the highest in the time of 50 DEG C, for making liquid crystal display serviceability the best, should make within liquid crystal display is operated in certain temperature range.Make liquid crystal display in the time that temperature declines, its threshold voltage raises, and improves the driving voltage of liquid crystal display, realizes liquid crystal display demonstration at low temperatures.
At present, the driving voltage that LCD shows is a fixed value, is commonly referred to as AVDD.Source drive IC Source Driver IC, by the computing to AVDD, VCOM, Gamma, forms gray scale voltage.As shown in Figure 4, taking the panel of 8bit as example, meet together and produce 256 gray scale voltage GAMMA1～GAMMA256.In the time that the environment temperature of LCD changes, identical gray scale voltage will be different to the deflection angle of liquid crystal molecule, cause LCD display brightness and contrast to change, and being embodied on Gamma gray scale curve is Gamma gray scale curve off-design value.Especially when temperature reduces, liquid crystal viscosity increases, and under same drive voltage, the liquid crystal response time is elongated, liquid crystal deflecting element to normal temperature under the required electric field force of equal angular will increase, need larger gray scale voltage.So the LCD power circuit provided by the invention with temperature compensation can be along with temperature variation, corresponding change lcd drive voltage, and then realize temperature compensation, improve the demonstration causing due to temperature bad.
The LCD power circuit with temperature compensation provided by the invention, can change the driving voltage of liquid crystal display so that liquid crystal display realizes demonstration at low temperatures, and it is-20 DEG C～+ 50 DEG C that this kind of method can make the operating temperature range of liquid crystal display.But driving voltage can not be without the raising placed restrictions on, and after driving voltage is brought up to a certain degree, the contrast of display can obviously decline, even blank screen and cause display to use.
The present invention can make TFT-LCD liquid crystal display at a certain temperature (for example 0 DEG C) still realize normal demonstration, can make LCDs have more wide application space, can make the working range of liquid crystal display reach-20 DEG C-50 DEG C, break away from its constraint the critical condition of 0 DEG C, practicality is better.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that multiple calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in memory storage and be carried out by calculation element, or they are made into respectively to each integrated circuit modules, or the multiple modules in them or step are made into single integrated circuit module realize.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a LCD power circuit with temperature compensation, is characterized in that, comprising:
Data acquisition module, for gathering liquid crystal display temperature information around;
Data processing module, for the preset temperature value of described temperature information and self storage is compared, obtains comparative result;
Micro-control unit MCU, for receive described comparative result by feedback network, and generates steering order according to described comparative result;
Integrated voltage-stabilized module, for regulating its output voltage according to described steering order, thinks driving voltage power supply.
2. circuit according to claim 1, it is characterized in that, described feedback network is made up of negative-feedback amplifier and totalizer, comprising: operational amplifier, be connected to the non-reversal amplifier between ground wire and the output terminal of described operational amplifier and be connected to the output terminal of described operational amplifier and the resistance R x of the in-phase input end of described non-reversal amplifier.
3. circuit according to claim 2, it is characterized in that, described non-reversal amplifier comprises: described operational amplifier, be connected to the resistance R x between the inverting input of described operational amplifier and the output terminal of described operational amplifier and be connected to ground wire and the inverting input of described operational amplifier between resistance R x.
4. circuit according to claim 2, is characterized in that, also comprises the driving circuit for drive liquid crystal display work according to the output voltage of described integrated voltage-stabilized module; Described driving circuit comprises the K switch 1-K switch 256 being connected in parallel with described data processing module;
The corresponding controlling resistance R1-of described K switch 1-K switch 256 resistance R 256; Wherein, described resistance R 1-resistance R 256 is connected in series; Described K switch 1-K switch 256 is all connected with the in-phase input end of described operational amplifier; Described resistance R 1-resistance R 256 is all connected with the in-phase input end of described operational amplifier.
5. circuit according to claim 1, is characterized in that, also comprises analog to digital converter;
Described analog to digital converter is connected with data processing module with described data acquisition module respectively, for converting the simulating signal of described data collecting module collected to digital signal, and is sent to described data processing module.
6. circuit according to claim 1, is characterized in that, also comprises the adjustable output circuit of transformation;
The adjustable output circuit of described transformation is connected with described integrated voltage-stabilized module, is used to described integrated voltage-stabilized module that output voltage is provided.
7. circuit according to claim 6, is characterized in that, the adjustable output circuit of described transformation is the adjustable output circuit of three end transformations, comprising: the transformer L1 being connected with power supply and the rectifier bridge stack UR being connected with described transformer L1;
The first input end mouth of described rectifier bridge stack UR is connected with the first output port of described transformer L1; The second input port of described rectifier bridge stack UR is connected with the second output port of described transformer L1; Described rectifier bridge stack UR is connected with described integrated voltage-stabilized module.
8. circuit according to claim 7, it is characterized in that, the adjustable output circuit of described transformation also comprises: the second filter network that is connected to the first filter network between described rectifier bridge stack UR and described integrated voltage-stabilized module and is connected with described integrated voltage-stabilized module;
Described the first filter network comprises: be connected in capacitor C 1 and capacitor C 4 between the output port of described rectifier bridge stack UR and the input port of described integrated voltage-stabilized module in parallel; Described the second filter network comprises: be connected in capacitor C 2 and capacitor C 3 between output port and the ground wire of described integrated voltage-stabilized module in parallel.
9. circuit according to claim 1, is characterized in that, also comprises electric battery;
Described electric battery is connected with described integrated voltage-stabilized module, is used to described integrated voltage-stabilized module that power supply is provided.
10. circuit according to claim 1, is characterized in that, described data acquisition module is temperature sensor; Described data processing module is for selecting comparer.
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| Publication number | Priority date | Publication date | Assignee | Title |
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