M324198 八、新型說明： 【新型所屬之技術領域】M324198 Eight, new description: [New technology field]
本創作係提供一種壓力感測元件電路結構，尤指利用一微處理器輸出 一增益碼及一零壓力補償碼，令該最大壓力時輸入到類比/數位控制器模組 (ADC)的值為滿刻度值，零壓力時輸入到類比/數位控制器模組(ADC)的值為 接近零的最小值，藉以達到最大的信號與量化誤差的比值，以提高壓力精 確量測之目的，同時開機時做零點補償，避免由於溫度的變化所造成的零 點飄移，影響測量的準確性。 【先前技術】 按，一般壓力感測電路之應用，往往需要使用多個精密電阻來提供足 夠的基準參考元件，因此針對上述電阻的分段提供，若以單一的運算放大 器或其它的功率晶體來驅動運算兩個以上並聯之惠式登電橋電路，由於各 電路間的阻抗差異及受外界溫度之變化，將會嚴重影響流經各並聯運算放 大器電流之均勻分配，使其電流過小（或過大）而相對導致壓力量測輸出 不足（或過壓），進而影響該壓力感測電路判讀之正確性，其次，電流過大 則會縮短壓力感測電路及連接感知元件的使用壽命，況且俾當外界溫度變 化時’該電阻之特性隨時間呈線性變化’殊不知其是否達到同標準5值 之準位，因此其間電路元件之比值運算，怎可判斷其為有效之輸出； 此外，如我國專利公報證書 M295768號「以電流模式偵測電阻式 壓力感測元件的指向裝置」，其内容揭示_電流模式細電阻式壓 力感測元件_向裝置，其係_該較源提供電流給鮮組電阻中被多 工器選取的-個以產生-參考電壓，並因應受壓產生_因電阻值變化而改 變的差動訊麵·，_簡償器補償絲職細旧的_，並以該 放大器放大補償後的訊號’最後將此訊號透過該類比至數位轉換器轉為數 5 M324198 位值，並交由-微控制器處理，藉以偵測該差動電壓作為壓力感應的基準； 上述之電路設計皆利用一多組電阻因應受壓而改變其電阻值，又該多 ' ㈣阻被選擇性地連接魏流，在未受壓魅生-參考電壓，在受壓時產 生-差動電壓，然，該電流控制電路未考慮外界溫度及電源f：路之殘留變 壓ϋ回授歸之變化，於電路起動_遭溫度影響，誠測元件基本 '量測歸零值其敏感值誤差，對於精準量測壓力有其重大之存在變數； 因此，如何和：供一種壓力感測元件電路結構，尤指利用一微處理器結 合該增益放大電路之壓力制，俾當_於壓力感纖用時，自動摘測該 % 感測元件敏感度變化及歸零偏壓，調整該增益放大電路之放大倍數，及零 點輸出，藉以達到壓力精確量測之目的；同時，開機時做零點補償，避免 由於/JZL度的變化所造成的零點飄移，影響測量的準確性；即為本案創作人 所欲解決之技術特徵之所在。 【新型内容】 本創作係提供一種壓力感測元件電路結構，其主要包含： 一電源供應單元’該電源供應單元主要由一基本供壓源電路與一恆定 禱m件所喊； 一微處理器早元’該微處理器單元⑶化⑺口^⑵沾沉⑽“：服们為一微處 理器，可透過程式將控制字碼寫入微處理器内之暫存器，藉以輸出一增益 碼及一零壓力補償碼； 一類比/數位轉換單元，其係包含一類比/數位轉換器（ADC)與一數位/ 類比轉換器（DAC); 一放大電路（Gain Amplify)，該放大電路主要由一可規劃放大電路 (Programmable Gain Amplify ; PGA)及一零電壓輸出補償電路所組成； 藉由上述電路單元之組合，俾當利用於壓力感測電路應用時，在校準 M324198 過程中自動根據感測元件敏感度及零壓力輸出電壓，該微處理器輸出之增 益碼可設定該可規劃放大電路(PGA)其放大倍數，又該微處理器輸出一零壓 力補偵碼至數位/類比轉換器（DAC)，令其輸出一調整補償零壓力輸出值至 該放大電路之零電壓輸出補償電路，俾當該最大壓力時輸入到類比/數位轉 換器（ADC)的值為滿刻度值，零壓力時輸入到類比/數位轉換器（AD〇的值為 接近零的最小值，藉以達到減少量化誤差並提高壓力精確量測之目的者， 同時，開機時做零點補償，避免由於溫度的變化所造成的零點飄移，影響 測量的準確性。The present invention provides a circuit structure of a pressure sensing component, in particular, a microprocessor outputs a gain code and a zero pressure compensation code, and the value of the input to the analog/digital controller module (ADC) at the maximum pressure is obtained. Full scale value, the value input to the analog/digital controller module (ADC) at zero pressure is the minimum value close to zero, so as to achieve the maximum ratio of signal to quantization error, so as to improve the accuracy of pressure measurement, and start up at the same time. Zero compensation is performed to avoid zero drift caused by temperature changes, which affects the accuracy of measurement. [Prior Art] According to the application of general pressure sensing circuits, it is often necessary to use a plurality of precision resistors to provide sufficient reference reference components, so that the segmentation of the above resistors is provided by a single operational amplifier or other power crystal. Driving operation of two or more parallel Huizhou boarding bridge circuits, due to the difference in impedance between the circuits and the change of external temperature, will seriously affect the even distribution of current flowing through each parallel operational amplifier, making its current too small (or too large) Relatively, the pressure measurement output is insufficient (or overvoltage), which in turn affects the correctness of the pressure sensing circuit. Secondly, if the current is too large, the service life of the pressure sensing circuit and the connection sensing component is shortened, and the external environment is used. When the temperature changes, the characteristic of the resistor changes linearly with time. It is not known whether it meets the standard 5 value. Therefore, how can the ratio of the circuit components be judged as valid output? In addition, such as the Chinese Patent Gazette M295768 "Direction device for detecting resistive pressure sensing elements in current mode", Content disclosure_current mode fine-resistance pressure sensing element_to the device, which provides current to the selected one of the fresh-group resistors to be generated by the multiplexer, and generates a voltage corresponding to the voltage The differential signal changed by the value change, the _compensator compensates for the fine _ of the wire, and the amplified signal is amplified by the amplifier. Finally, the signal is converted to the number 5 M324198 by the analog-to-digital converter. And is processed by the -microcontroller to detect the differential voltage as a reference for pressure sensing; the above circuit design uses a plurality of sets of resistors to change the resistance value according to the pressure, and the multiple '(four) resistance is selected Sexually connected to the Wei flow, in the uncompressed charm - reference voltage, when the pressure is generated - differential voltage, however, the current control circuit does not consider the external temperature and power supply f: the residual pressure of the road ϋ feedback Change, in the circuit start _ by temperature, the measured component is basically 'measured zero value of its sensitive value error, there are significant variables for accurate measurement pressure; therefore, how and: for a pressure sensing component circuit structure ,especially Using a microprocessor in combination with the pressure system of the gain amplifying circuit, when the pressure sensing fiber is used, the sensitivity of the % sensing element and the return-to-zero bias are automatically measured, and the amplification factor of the gain amplifying circuit is adjusted. And zero output, in order to achieve the purpose of accurate pressure measurement; at the same time, zero offset compensation when starting, to avoid the zero drift caused by the change of /JZL degree, affecting the accuracy of measurement; that is, the technology that the creator of this case wants to solve The location of the feature. [New content] The present invention provides a pressure sensing component circuit structure, which mainly comprises: a power supply unit 'the power supply unit is mainly shouted by a basic supply source circuit and a constant prayer piece; a microprocessor Early element 'the microprocessor unit (3) (7) port ^ (2) sinking (10) ": the service is a microprocessor, the program can write the control code into the scratchpad in the microprocessor, in order to output a gain code and a zero-pressure compensation code; a analog/digital conversion unit comprising an analog/digital converter (ADC) and a digital/analog converter (DAC); an amplifying circuit (Gain Amplify), the amplifying circuit is mainly composed of Programmable Gain Amplify (PGA) and a zero voltage output compensation circuit; by the combination of the above circuit units, when used in a pressure sensing circuit application, automatically according to the sensing element during calibration M324198 Sensitivity and zero-pressure output voltage, the gain code output by the microprocessor can set the amplification factor of the programmable amplifier circuit (PGA), and the microprocessor outputs a zero pressure compensation a code-to-digital/analog converter (DAC) that outputs an offset-compensated zero-pressure output value to the zero-voltage output compensation circuit of the amplifying circuit, and the value input to the analog/digital converter (ADC) when the maximum pressure is applied For the full scale value, input to the analog/digital converter at zero pressure (the value of AD〇 is close to zero, so as to achieve the purpose of reducing the quantization error and improving the accurate measurement of the pressure, and at the same time, zero compensation is performed at the time of starting, Avoid zero drift caused by temperature changes, affecting the accuracy of the measurement.
【實施方式】 為使貴審查員方便簡捷瞭解本創作之其他特徵内容與優點及其所達 成之功效能夠更為顯現，茲將本發明配合附圖，詳細說明如下：[Embodiment] In order to make it easier for the examiner to understand the other features and advantages of the creation and the effects achieved by the examiner, the present invention will be described in detail with reference to the accompanying drawings:
本創作係提供一種壓力感測元件電路結構，其係應用一微處理器透過 程式將控制字碼寫入微處理器内之暫存器，藉以輸出一增益碼 (GainCode)20A及一零壓力補償碼20C ;請參閱第四、五圖所示，其中該程式 演算法(Algorithm)流程可包含一自動校準流程及一使用者壓力量測流程；該 自動校準流程如下，首先將壓力設為零，同時將增益碼(GainC〇de)2〇A值設 為零，又該中央處理器單元(CPU)送出一零壓力補償碼（資料數位信號)至數 位/類比轉換器（DAC)30B，經該數位/類比轉換器（DAC)30B將其資料數位信 號轉換成一類比輸出值(調整補償零壓力輸出值C^)，輸出送往放大電路4〇 之零電壓輸出補償電路40B，使得類比/數位轉換器（ADC)30A讀零壓力的讀 值為y〇(〇MDG〇in，即類比/數位轉換器(ADC)30A的最小讀值，接著壓力設 為量測壓力的最大值Pa，類比/數位轉換器(ADC)30A讀值為y〇(p3)，調整增益 碼(GainC〇de)20A為X，將會使yx(P3)=ADCaax(接近ADC滿刻度的一個預設值）， 同時又該中央處理器單元(CPU)送出一資料數位信號（零壓力補償碼2〇c)至 7 M324198The present invention provides a pressure sensing component circuit structure, which uses a microprocessor to write a control code into a temporary register in a microprocessor, thereby outputting a gain code (GainCode) 20A and a zero pressure compensation code. 20C; Please refer to the fourth and fifth figures, wherein the algorithm algorithm may include an automatic calibration process and a user pressure measurement process; the automatic calibration process is as follows, first set the pressure to zero, and at the same time The gain code (GainC〇de) 2〇A value is set to zero, and the central processing unit (CPU) sends a zero pressure compensation code (data digital signal) to the digital/analog converter (DAC) 30B, via the digital / Analog converter (DAC) 30B converts its data digit signal into an analog output value (adjustment compensation zero pressure output value C^), and outputs the zero voltage output compensation circuit 40B to the amplifier circuit 4, so that the analog/digital converter The (ADC) 30A read zero pressure reading is y〇 (〇MDG〇in, the minimum reading of the analog/digital converter (ADC) 30A, then the pressure is set to the maximum value of the measured pressure Pa, analog/digital conversion (ADC) 30A read y (p3), adjust the gain code (GainC〇de) 20A to X, which will make yx(P3)=ADCaax (close to a preset value of the full scale of the ADC), and at the same time the central processing unit (CPU) sends a data. Digital signal (zero pressure compensation code 2〇c) to 7 M324198
奏丈位/類比轉換器（DAC)30B，經該數位/類比轉換器（])a(；)3〇b將其資料數位 信號轉換成一類比輸出值（調整補償零壓力輸出值,輸出送往放大電路 40之零電壓輸出補償電路40B，同時調整其值使得該可規劃放大電路 (PGA)40A輸出至類比/數位轉換器（ADC)30A的讀值為yx(P3)=ADCmax，即預定 之類比/數位轉換器（ADC)30A的最大讀值，記錄X值，同時記錄此零壓力 補{員碼20C之值’再此以DACtune表示’根據上述之機制(w〇rkChart)，如表一所 示，分別記錄以下類比/數位轉換器(ADC)30A之讀值，進而完成一自動校準 流程。Play the position/analog converter (DAC) 30B, and convert the data digit signal into an analog output value via the digital/analog converter (]) a(;)3〇b (adjust the compensation zero pressure output value, the output is sent to The zero voltage output compensation circuit 40B of the amplifying circuit 40 adjusts its value so that the readout of the programmable amplifier circuit (PGA) 40A to the analog/digital converter (ADC) 30A is yx(P3)=ADCmax, that is, predetermined. The maximum reading of the analog/digital converter (ADC) 30A, record the X value, and record the value of this zero pressure compensation {member code 20C' and then denoted by DACtune' according to the above mechanism (w〇rkChart), as shown in Table 1. As shown, the following analog/digital converter (ADC) 30A readings are recorded separately to complete an automatic calibration process.
表一 壓力值 ADC讀值 記錄值 1 p3 yxCPa) yx(P3) 2 P2(小於p3大於〇) Υχ(Ρ2) y《P2) 3 Pi(小於p2大於0) yx(P〇 yx(P〇 4 0 yx(〇) yx(〇) 俾當應用於實際量測壓力時，透過該微處理器所執行之使用者壓力量 測流程機制’藉以達職_4壓力之目的，其巾該使用者壓力量測流程 主要進行下列程序： 開機時微處理器設定該增益碼(GainC〇de)20i^出設為χ，並設定數位/ 類比轉換器(DAC)30B為MCtune，並且該類比/數位轉換器（adc)3〇A的讀值為 一(此值為零壓力的類比/數位轉換器(ADC)讀值），下列數值的計算，作為 零壓力的溫度補償： y'x(0)-yimt r = 1,2,3 yf = y^{Pi)+yMt - ^(0) 壓力P時，該類比/數位轉換器(ADC)3〇A讀值(以γχ(Ρ)表示），判斷yx(p) 8 M324198 值的範圍落入哪個區間：ο·:0，1，2，，0) y,(p,)：^,CP)幺(尸，+ι)，利用下式運算： p=Pi+y：(p%-Pym{yx(P)^yx(Pi)} ’進而求得户為其所測得之壓力值； 當八⑼》乂(尸3)，利用下式運算： p=p3 + P3-P2 {Λ(尸)-乂 (〇} 藉由當增益碼(GainCode)20A設為X時’取類比/數位轉換器（aj)c)3〇a % 讀值，又該可規劃放大電路WA)40A的增益(Gain)與增益碼(GainCode)20A 成線性關係’且增益碼(GainCode)20A越大增益(Gain)越大，即利用上述增益 碼（GainCode) 20A之調整’達到最大的類比/數位轉換器（adc)30A的信號與 量化誤差之比值，因此壓力的量測準確度愈高，同時，開機時做零點補償， 避免由於溫度的變化所造成的零點飄移，影響測量的準確性。 因此本創作即利用上述公式中增益碼（GainCode) 20A之調整，來達到 根據感測器的靈敏度調整可規劃放大電路(PGA)40A的放大倍數，並利用零 壓力補償碼20C補償感測元件S零壓力的輸出，使得感測元件3信號到達類比 Φ /數位轉換器（ADC)30A的輸入，能有最大的跨距（即零壓力時為1^，而最 大壓力時為ADCinax)，使信號與量化誤差的比值達到最大，請參閱第一圖所 示，圖中，其係為本創作之電路方塊示意圖，該電路主要包含： 。一電源供應單元10，該電源供應單元10分別輸出一基本供壓源1〇〇、 一定電流源I及一定電壓源Vref，又該電源供應單元1〇之定電壓源Vref輸出 端分別與一恆定電流元件11及一放大電路40接設，且該但定電流元件11 另一端點則分別與該感測元件S之output2端及電源供應單元1 〇内運算放 大器接設’該電源供應單元10之定電流源I輸出端與該感測元件η之 outputl端接設，又該電源供應單元1〇分別提供輸出一基本供壓源1〇〇給 放大電路40、類比/數位轉換單元30及微處理器單元20以做為其基本電路 M324198 元件操作之工作電壓； 微處理器單元20 ’該微處理器單元(Micro processor unit : MPU)為一 微處理器，可透過程式將控制字碼寫入微處理器内之暫存器，藉以輸出一 增益碼(GainCode)20A及一零壓力補償碼20C，該微處理器輸出一資料數位 信號增益碼(GainCode)20A至放大電路（Gain Amplify)40之可規劃放大電路 40A中，又該增益碼(GainCode)2〇A可設定該可規劃放大電路(pga)40A輸出 至類比/數位轉換器（ADC)30A之放大倍數，該微處理器輸出一資料數位信號 ▲ (零壓力補償碼20C)至數位/類比轉換器（DAC)30B，令該數位/類比轉換器 ^ (DAC)30B將其資料數位信號轉換成一類比輸出值(調整補償零壓力輸出值 Cont) ’輸出送往該放大電路((jain Amplify)40之零電麼輸出補償電路40B ; 一類比/數位轉換單元30，該類比/數位轉換單元30包含一類比/數位 轉換器（ADC)30A及一數位/類比轉換器（DAC)30B，又該類比/數位轉換單元 30主要提供一類比與數位間準位信號之編碼轉換以為對應輸出之邏輯信 號，該類比/數位轉換器(ADC)30A對應輸出一資料數位信號20B至微處理器 單元20，又該類比/數位轉換器30A對應接收來自該放大電路(Gain Amplify)40之一放大信號Cin，該數位/類比轉換器（DAC)30B對應接收來自該 Λ 微處理器單元20之一零壓力補償碼20C，又該數位/類比轉換器（DAC)30B 對應輸出一類比輸出值（調整補償零壓力輸出值Cout)至放大電路(Gain Amplify)40之零電壓輸出補償電路40B ; 一放大電路(GainAmplify)40，該放大電路(PGA)40主要由包含一可規劃 放大電路40A及一零電壓輸出補償電路40B，根據感測元件S的靈敏度及零 壓力輸出，該微處理器單元20輸出零壓力補償碼20C至一數位/類比轉換 器（DAC)30B，又該放大電路(Gain Amplify)40接收來自該數位/類比轉換器 (DAC)30B之輸出之零壓力補償電壓，經該放大電路(GainAmplify)40零電壓 輸出補償電路40B之零電壓歸零補償；同時該微處理器單元20輸出增益碼 (GainCode)，該放大電路(GainAmplify)40接收來自該微處理器單元20所送 M324198 出之增益碼(GainCode)20A為X，調整可規劃放大電路(pGA)4〇A之放大倍 數；俾當該最大壓力時輸入到類比/數位轉換器（ADC)30A的值為滿刻度值， 零壓力時輸入到類比/數位轉換器（ADC)30A的值為接近零的最小值，藉以達 到減少量化誤差並提高壓力精確量測之目的者；同時，開機時做零點補償， 避免由於溫度的變化所造成的零點飄移，影響測量的準確性。 請參閱第二、三圖所示，為本創作實施之電路邏輯示意圖，第二圖中 ' 所圈設之虛線方塊與第三圖全部内容其係標示代表為一放大電路(GainTable 1 Pressure value ADC reading value 1 p3 yxCPa) yx(P3) 2 P2 (less than p3 is greater than 〇) Υχ(Ρ2) y“P2) 3 Pi (less than p2 is greater than 0) yx(P〇yx(P〇4 0 yx(〇) yx(〇) 应用于 When applied to the actual measurement pressure, the user pressure measurement process mechanism executed by the microprocessor is used to achieve the purpose of _4 pressure. The measurement process mainly performs the following procedures: When the power is turned on, the microprocessor sets the gain code (GainC〇de) 20i^out to χ, and sets the digital/analog converter (DAC) 30B to MCtune, and the analog/digital converter (adc) 3〇A has a reading of one (this value is zero pressure analog/digital converter (ADC) reading), the following values are calculated as zero pressure temperature compensation: y'x(0)-yimt r = 1,2,3 yf = y^{Pi)+yMt - ^(0) When the pressure is P, the analog/digital converter (ADC) 3〇A reading (expressed as γχ(Ρ)), judge yx (p) 8 M324198 The range of values falls into: ο::0,1,2,,0) y,(p,):^,CP)幺 (corpse, +ι), using the following formula: p =Pi+y:(p%-Pym{yx(P)^yx(Pi)} 'and then ask the household to measure the pressure value When eight (9) 乂 (corpse 3), use the following formula: p=p3 + P3-P2 {Λ(尸)-乂(〇} by analogy/digit when the gain code (GainCode) 20A is set to X The converter (aj) c) 3〇a % is read, and the gain (Gain) of the programmable amplifier circuit WA) 40A is linear with the gain code (GainCode) 20A' and the gain code (GainCode) 20A is larger ( The larger the Gain), the higher the ratio of the signal to the quantization error of the maximum analog/digital converter (adc) 30A is achieved by the above-mentioned gain code (GainCode) 20A adjustment, so the higher the accuracy of the pressure measurement, at the same time, the power-on When doing zero compensation, avoid zero drift caused by temperature changes, affecting the accuracy of measurement. Therefore, the creation uses the gain code (GainCode) 20A adjustment in the above formula to achieve the magnification of the programmable amplifier circuit (PGA) 40A according to the sensitivity of the sensor, and compensates the sensing element S with the zero pressure compensation code 20C. The zero-pressure output causes the sensing element 3 signal to reach the input of the analog Φ/digital converter (ADC) 30A, with the largest span (ie 1^ at zero pressure and ADCinax at maximum pressure), making the signal The ratio of the quantization error is the largest, please refer to the first figure, which is a schematic diagram of the circuit block of the creation. The circuit mainly includes: a power supply unit 10, the power supply unit 10 respectively outputs a basic supply source 1〇〇, a constant current source I and a certain voltage source Vref, and the constant voltage source Vref output end of the power supply unit 1〇 is respectively constant The current component 11 and an amplifying circuit 40 are connected, and the other end of the constant current component 11 is connected to the output terminal of the sensing component S and the operational amplifier of the power supply unit 1 respectively. The output terminal of the constant current source I is connected to the output1 end of the sensing element η, and the power supply unit 1 提供 respectively provides an output to the basic voltage source 1 to the amplifying circuit 40, the analog/digital converting unit 30, and the micro processing. The unit 20 is used as the operating voltage of the element circuit M324198 component operation; the microprocessor unit 20 'micro processor unit (MPU) is a microprocessor, and the control word can be written into the micro processor through the program. The register in the device outputs a gain code (GainCode) 20A and a zero pressure compensation code 20C, and the microprocessor outputs a data digit gain code (GainCode) 20A to the amplifying circuit (Gain Amp). In the programmable amplifier circuit 40A of lify) 40, the gain code (GainCode) 2A can set the amplification factor of the programmable amplifier circuit (pga) 40A output to the analog/digital converter (ADC) 30A, the micro processing The device outputs a data digit signal ▲ (zero pressure compensation code 20C) to a digital/analog converter (DAC) 30B, so that the digital/analog converter (DAC) 30B converts its data digit signal into an analog output value (adjustment compensation) Zero-pressure output value Cont) 'Output is sent to the amplifying circuit ((jain Amplify) 40 zero output output compensation circuit 40B; a analog/digital conversion unit 30, the analog/digital conversion unit 30 includes an analog/digital converter (ADC) 30A and a digital/analog converter (DAC) 30B, and the analog/digital conversion unit 30 mainly provides a code conversion of an analog-to-digital inter-bit signal to a corresponding output logic signal, the analog/digital converter The (ADC) 30A corresponds to output a data digit signal 20B to the microprocessor unit 20, and the analog/digital converter 30A correspondingly receives an amplified signal Cin from the amplifying circuit (Gain Amplify) 40, the digital/analog converter ( DAC) 30B corresponds to receive one of the zero pressure compensation codes 20C from the microprocessor unit 20, and the digital/analog converter (DAC) 30B outputs an analog output value (adjustment compensation zero pressure output value Cout) to the amplifying circuit (Gain) Amplify) 40 zero voltage output compensation circuit 40B; an amplifying circuit (GainAmplify) 40, the amplifying circuit (PGA) 40 mainly comprises a programmable amplifier circuit 40A and a zero voltage output compensation circuit 40B, according to the sensing element S Sensitivity and zero pressure output, the microprocessor unit 20 outputs a zero pressure compensation code 20C to a digital/analog converter (DAC) 30B, and the amplifying circuit (Gain Amplify) 40 receives the digital/analog converter (DAC). The zero-voltage compensation voltage of the output of 30B is compensated by zero voltage reset of the zero-voltage output compensation circuit 40B of the amplifying circuit (GainAmplify) 40; and the microprocessor unit 20 outputs a gain code (GainCode), the amplifying circuit (GainAmplify) 40 receiving the gain code (GainCode) 20A from the M324198 sent by the microprocessor unit 20 as X, adjusting the magnification of the programmable amplifier circuit (pGA) 4〇A; 输入 when the maximum pressure is input The value of the analog/digital converter (ADC) 30A is the full scale value, and the value of the input to the analog/digital converter (ADC) 30A at zero pressure is a minimum value close to zero, thereby reducing the quantization error and increasing the pressure accuracy. At the same time, zero-point compensation is applied during startup to avoid zero drift caused by temperature changes, which affects the accuracy of measurement. Please refer to the second and third figures, which is the logic diagram of the circuit implemented in this creation. In the second figure, the dotted line and the third part of the circle are marked as an amplifying circuit (Gain).
Amplify MO ’圖中該運算放大器OP(UIA)之放大輸出端14接設一電阻R3再與 另一運算放大器〇P(UlC)之放大輸入端9相接，該放大輸出端8連接另一運算 放大器0PCU2A)之放大輸入端12，經連續二極之串接放大，最後輸出送至該 類比/數位控制器（ADC)30A之放大信號Cin端，又該微處理器單元2〇之增益碼 (GainCode)20A(AMP0· · 7)信號輸出接設至該放大電路((jain Amplify)40之可 規劃放大電路(PGA)40A上，俾當該感測元件S之〇utput2端接收來自該恒電 流元件11之定電壓源Vref，經微處理器單元20之韌體程式碼核校後之控制信 號增益碼(GainCode)20A輸出一資料信號至運算放大器〇p(uiA)之輸入端（13) 及運算放大器0P(U2A)之放大輸入端（12)，透過該數位/類比轉換器 (慰)30Β之調整補償零壓力輸出值Cout輸入至放大電路(Gain Amplify)40之零 電壓輸出補償電路40B中，調整該可規劃放大電路(pga)40A中運算放大器 0POJ2A)之放大信號α端輸出一相對放大增益至類比/數位轉換器 (ADO30A ； 藉由以上所述可知該放大電路(Gain AmPlify)4〇輸出增益係隨著其增益 碼(GainCode)20A及調整補償零壓力輸出值C〇ut值變化而改變，跟隨感測元件S 之敏感值而變化，予以調整放大電路(Gain Amplify)40可規劃放大電路 (PGA)40A中運算放大器0P(U1A及U1C)之放大倍數，及作零點補償，而當感 測元件S其敏感值及零壓力輸出不同時，仍能維持當最大壓力時輸入到類比 /數位轉換器(ADC)30A的值為滿刻度值，零壓力時輸入到類比/數位轉換器 11 M324198 (ADC)3GA的值為接近零的最小值，藉以達到齡量化誤差並提紐力精確 置測之目的者；同時，開機時做零闕償，避免由於溫度的變化所造成的 零點飄移，影響測量的準確性。 上列詳細說明係針對本創作之可行實施例之具體說明，惟該實施例並 非用以限制本創作之專利範圍，凡未脫離本創作技藝精神所為之等效實施 或變更，均應包含於本案之專利範圍中。 為使本創作更加舰出其進步性與實祕，贿習⑽—比較分析如 _ 習用技術： 卜電路設計複雜且分設乡觀格之電阻，增加祕管理的獅性且校準 程序也較繁雜。 2、無歸零偏壓之校準，量測誤差值較大。 本發明優點： ,、了程式化邏輯模組，電路基板可積體化或微縮設計，符合現今電子 佈局設計之潮流。 2、 根據感測器靈敏度及虔力輸&，送出增益碼及零麼力補償碼，使得 到達ADC的壓力信號有最大的跨距，使信號與量化誤差比值達到最 大’提高該壓力量測的精確性。 3、 開機零點校正，不受溫差變化轉，增加#測準確性。 /综上_，本_在突破絲之技麟構Τ，確實6達_欲增進之 =效’且也非熟悉該項技藝者所易於思及，再者，本新财請前未曾公開， ^由二之進乂症實用性顯已符合新型專利之申請要件，差依法提出新 里申請，_貴局核林件新型專利巾請案，以關作，至感德便。 【圖式簡單說明】 12 M324198 第一圖係為本創作之電路方塊圖。 第二圖係為本創作之實施電路邏輯示意圖。 第三圖係為本創作放大電路之實施電路邏輯示意圖。 第四圖係為本創作可程式化邏輯電路之韌體流程示意圖。 第五圖係為本創作運算比值流程示意圖。 【主要元件符號說明】 10.. 電源供應單元 100.. 基本供壓源 Vref..定電壓源 20.. 微處理器單元 20B..資料數位信號 30.. 類比/數位轉換單元 30B..數位/類比轉換器 40.. 放大電路 40B..零電壓輸出補償電路 Cin..放大信號 11.. 恆定電流元件 1.. 定電流源 20A..增益碼 20C..零壓力補償碼 30A..類比/數位轉換器 40A..可規劃放大電路 S..感測元件Amplify MO 'The amplified output terminal 14 of the operational amplifier OP (UIA) is connected to a resistor R3 and then connected to the amplification input terminal 9 of another operational amplifier 〇P (UlC), and the amplified output terminal 8 is connected to another operation. The amplifying input terminal 12 of the amplifier 0PCU2A) is serially amplified by continuous two poles, and finally the output is sent to the amplified signal Cin terminal of the analog/digital controller (ADC) 30A, and the gain code of the microprocessor unit 2 The GainCode) 20A (AMP0··7) signal output is connected to the amplifier circuit (PGA) 40A of the amplifying circuit (the 〇put2 terminal of the sensing element S receives the constant current) The constant voltage source Vref of the component 11 outputs a data signal to the input terminal (13) of the operational amplifier 〇p(uiA) via the control signal gain code (GainCode) 20A of the firmware code of the microprocessor unit 20; The amplification input terminal (12) of the operational amplifier 0P (U2A) is input to the zero voltage output compensation circuit 40B of the amplifying circuit (Gain Amplify) 40 through the adjustment/compensation zero pressure output value Cout of the digital/analog converter. , adjust the operational amplifier of the programmable amplifier circuit (pga) 40A The amplification signal α of the 0POJ2A) outputs a relative amplification gain to the analog/digital converter (ADO30A; as described above, the amplification circuit (Gain AmPlify) 4〇 output gain is followed by its gain code (GainCode) 20A and Adjusting the compensation zero pressure output value C〇ut value changes, changes according to the sensitive value of the sensing element S, and adjusts the amplifying circuit (Gain Amplify) 40 programmable amplifier circuit (PGA) 40A operational amplifier 0P (U1A and U1C Magnification, and zero compensation, when the sensing element S has different sensitivity and zero pressure output, it can maintain the value of the input to the analog/digital converter (ADC) 30A when the maximum pressure is full. At zero pressure, input to analog/digital converter 11 M324198 (ADC) 3GA value is the minimum value close to zero, so as to achieve the age quantization error and the purpose of accurate placement of the force; at the same time, zero compensation when starting up To avoid the drift of the zero point caused by the change of temperature, affecting the accuracy of the measurement. The above detailed description is specific to the feasible embodiment of the present invention, but the embodiment is not intended to limit the creation of the present invention. The scope of profit, equivalent to the implementation or change of the creative spirit of this creative work, should be included in the scope of the patent in this case. In order to make this creation more progressive and practical, bribery (10) - comparative analysis such as _ Conventional technology: The design of the circuit is complicated and the resistance of the township is set, the lion of the secret management is added and the calibration procedure is also complicated. 2. The calibration without zero return bias, the measurement error value is large. The advantages of the invention: , the stylized logic module, the circuit substrate can be integrated or miniature design, in line with the current trend of electronic layout design. 2. According to the sensitivity and power of the sensor, the gain code and the zero force compensation code are sent, so that the pressure signal reaching the ADC has the largest span, so that the ratio of the signal to the quantization error is maximized. The accuracy. 3, start zero calibration, no change in temperature difference, increase # measurement accuracy. / In summary _, this _ in the breakthrough of the technology of the lining, it is indeed 6 _ want to promote the effect = and is not familiar with the artist can easily think about it, in addition, this new wealth has not been disclosed before, ^ The practicality of the second sputum has been consistent with the application requirements of the new patent, and the application for the new literary case has been submitted according to the law, and the new patented towel for your nuclear forest is requested to be closed. [Simple description of the diagram] 12 M324198 The first diagram is the circuit block diagram of this creation. The second diagram is a schematic diagram of the implementation circuit of this creation. The third figure is a schematic diagram of the implementation circuit of the creation amplifying circuit. The fourth picture is a schematic diagram of the firmware flow of the authorizable programmable logic circuit. The fifth picture is a schematic diagram of the ratio of the operation calculation ratio. [Description of main component symbols] 10. Power supply unit 100.. Basic supply voltage source Vref.. Constant voltage source 20. Microprocessor unit 20B.. Data digit signal 30. Analog/digital conversion unit 30B.. / Analog converter 40.. Amplifier circuit 40B.. Zero voltage output compensation circuit Cin.. Amplified signal 11. Constant current element 1. Constant current source 20A.. Gain code 20C.. Zero pressure compensation code 30A.. Analogy /Digital Converter 40A.. Planable Amplifier Circuit S.. Sensing Element
Cout..調整補償零壓力輸出值 13Cout.. Adjust the compensation zero pressure output value 13