201248131 六、發明說明： 【發明所屬之技術領域】 本發明關於一種使用了熱敏電阻的溫度測量系統。 【先前技術】 目前，已知有使用熱敏電阻來測量溫度，將測量溫度 數位化並將其取入到微電腦，來用於溫度控制等。 圖3表示現有溫度測量系統的一個例子的電路結構 圖。圖3中，熱敏電阻1的一端與電池2連接，熱敏電阻1 的另一端經由分壓電阻（bleeder resistance ) 3接地。熱敏 電阻1與分壓電阻3的連接點與AD轉換器4連接，將通 過熱敏電阻1檢測出的溫度檢測信號供給到AD轉換器4。 調節器（regulator) 5對從電池2供給的直流電壓進行 堡後供給到AD轉換4和微電腦6。AD轉換器4對溫 度檢測信號進行類比/數位轉換後供給到微電腦6。微電腦6 取入數位的溫度檢測信號’執行基於該溫度檢測信號的處 理’控制例如未圖示的驅動電路等。 此外，已知有如下技術：使用熱敏電阻來生成對應於 其電阻值的檢測電壓Vs ’對檢測電壓Vs進行類比數位轉 換後生成檢測電壓資料Dvs，使用檢測電壓資料Dvs來生 成表記憶體（table memory) 1〇4的位址，根據與該位址對 應的溫度資料Dt檢測出預定的判定條件成立而輪出熱檢測 報知信號OUT，根據熱檢測報知信號ουτ來輸出 號（例如參照專利文獻υ。 .....Η〇 專利文獻1 :曰本特開2004-251852號公報 。。在現有溫度測量系統中’當微電腦6啟動未圖示的點 火盗（igniter)等的驅動電路時，由於驅動電路消耗大電流 3/12 201248131 所以有電池2的電壓暫時降低等情況^並且，隨著使用時 間變長，電池2的電壓緩緩降低。 當電池電壓降低時，即使溫度一定，熱敏電阻】與分 壓電阻3的連接點的電壓也降低。相反，由於從調節器$ 向AD轉換器4恒壓地供給穩壓後的電壓，所以AD轉換器 4與電池電壓的降低幾乎無關地進行通常動作，結果是電池 電壓降低時的AD轉換器4輸出的數位溫度檢測信號的值 與電池電壓沒有降低的通常動作時相比變小，產生了數位 溫度檢測信號的精度惡化這樣的問題。 【發明内容】 〔發明所欲解決之課題〕 本發明疋鑒於以上問題而提出的發明，其目的在於提 供一種能夠提高數位溫度檢測信號的精度的溫度測量系 統。 〔解決課題之手段〕 本發明第一貫施方式的溫度測量系統，具有：熱敏電 阻（21)，其輸出與溫度對應的電壓的溫度檢測信號；以及 AD轉換器（19)，其對所述熱敏電阻輸出的溫度檢測信號 進行類比/數位轉換，且所述溫度測量系統將數位化後的溫 度檢測信號取入到微電腦（15)，所述溫度測量系統還具 有：參考電路（14)’其使用從電池供給的電源來生成基準 電壓；第一調節器（16)，其使用所述基準電壓來生成所述 熱敏電阻（21)的工作電壓；以及第二調節器（13)，其使 用所述基準電壓來生成所述AD轉換器（19)的工作電壓。 較佳者是所述熱敏電阻（21)的一端被供給由所述第 一調節器（16)所生成的工作電壓，所述熱敏電阻（21) 4/】2 201248131 的另一端經由分壓電阻（R11)接地，從所述熱敏電阻（Μ ) 和所述分壓電阻（R11)的連接點輸出溫度檢測信號。 較佳者是設有多個所述熱敏電阻，所述溫度測量系統 U’、有.多工器（20)’其選擇所述多個熱敏電阻 輸出的溫度檢測信號中的某一個來供給到所述AD (19)。 。口 較佳者是所述多個熱敏電阻（21〜23)測定由多個氣體 燃燒器加熱的銷底的溫度。 — 此外，上述括弧内的參考符號是為了易於理解而標注 的，僅是一個例子，並不局限於圖示的形態。 〔發明效果〕 根據本發明，能夠提高數位溫度檢測信號的精度。 【實施方式】 & 以下，根據附圖對本發明的實施方式進行說明。 <溫度測量系統的結構> 圖1是本發明的溫度測量系統的一個實施方式的電路 結構圖。ffi 1中’電池U向溫度測量系統1〇的整體供給 電源VCC。電池11負極接地，正極與數位電路用的調節 12、類比電路用的調節器13、參考電路Μ連接。 ，數位電路用的調節器12將從電池^共給的電源K 穩壓後作為電源電壓Vccl供給到微電腦15。從電池η ^ 類比電路㈣調節H 13供給電源vcc，並且從參考電足 14向類比電路用的調節器13供給基準電壓據以 電壓Vref生成電源電壓Vee2 (例如2卿），將該電源^ V c c2供給到熱敏電阻用調節$ i 6、i 7、i 8以及α〇轉換差 19 〇 、' 5/12 201248131 „象這樣將數位電路用的調節器12和類比電路用的調節 =古分離是為了防止在數位電路也就是微電腦15中產生 。向頻雜訊混人到參考電路14、熱敏電阻用調節器ι6、ι7、 18、AD轉換器19中。 參考電路Μ將從電池11供給的電源vcc穩壓後產生 f電塵Vref (例如ι.5ν；) ’並將該基準糕v时供給到 電路用的調節器13和熱敏電阻用調節器16、Η、Μ。 ㈣圖2表不類比電路用的調節器13的一個實施方式的電 :圖。調節器U由運算放大器⑽、p溝道刪電晶體 =、串聯連接的電阻Ra、Rb構成。向運算放大器〇p〇的 =相輸人端子供給基準電壓财，運算放大器⑽的反相 ^端子與電阻Ra、Rb的連接點連接。運算放大器〇p〇 的輸出端與MOS電晶體M0的栅極連接。 從電池Π向MOS電晶體M0的源極供給電源vcc， MOS電晶體M0的漏極與電阻Ra的一端連接，電阻处的 另-端接地。運算放大器〇p〇進行工作以使從電阻如、肋 的連接點_的轉與基準電壓财㈣，由此，使從 MOS電晶體M0的漏極輸出的電壓Vec2為例如 定電壓。 、圖1中，熱敏電阻用調節H 16由運算放大器0P1、p 溝道MOS電晶體M1、串聯連接的電阻r^r2構成。向 運算放大器OPi的同相輸入端子供給基準電壓歸 放大器，的反相輸人端子與電阻R1、R2的連接點連‘ 運算放大器ορι的輸出端子與M〇s電晶體Μι的拇 接。此外’從微電腦15向M〇s電晶體M1白勺柵極供給選 擇信號。 ' 6/12 201248131 從類比電路用的調節器13向M〇s電晶體Μι的源極 供給電源電壓V(x2,電阻R1的—端與M〇s電晶體奶的 漏極連接，電阻R2的另-端接地。運算放大^⑽進行 工作以使從電阻RhR2的連接點回饋㈣駐基準電壓201248131 VI. Description of the Invention: [Technical Field] The present invention relates to a temperature measuring system using a thermistor. [Prior Art] At present, it is known to use a thermistor to measure temperature, digitize the measurement temperature, and take it into a microcomputer for temperature control and the like. Fig. 3 is a circuit diagram showing an example of a conventional temperature measuring system. In FIG. 3, one end of the thermistor 1 is connected to the battery 2, and the other end of the thermistor 1 is grounded via a bleeder resistance 3. The connection point of the thermistor 1 and the voltage dividing resistor 3 is connected to the AD converter 4, and the temperature detection signal detected by the thermistor 1 is supplied to the AD converter 4. A regulator 5 supplies the DC voltage supplied from the battery 2 to the AD conversion 4 and the microcomputer 6. The AD converter 4 performs analog/digital conversion on the temperature detection signal and supplies it to the microcomputer 6. The microcomputer 6 takes in a digital temperature detection signal 'Execute processing based on the temperature detection signal' to control, for example, a drive circuit or the like (not shown). Further, a technique is known in which a thermistor is used to generate a detection voltage Vs' corresponding to a resistance value thereof, and analog voltage conversion is performed on the detection voltage Vs to generate a detection voltage data Dvs, and a detection voltage data Dvs is used to generate a table memory ( The address of the space of 1 to 4, based on the temperature data Dt corresponding to the address, detects that the predetermined determination condition is satisfied, and the thermal detection notification signal OUT is turned on, and outputs the number according to the thermal detection notification signal ουτ (for example, refer to the patent document) . υ 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 2004 ign ign ign ign ign ign ign ign ign ign ign ign ign ign ign Since the drive circuit consumes a large current of 3/12 201248131, there is a case where the voltage of the battery 2 is temporarily lowered, etc., and as the use time becomes longer, the voltage of the battery 2 is gradually lowered. When the battery voltage is lowered, even if the temperature is constant, the heat is fixed. The voltage at the connection point between the resistor and the voltage dividing resistor 3 is also lowered. On the contrary, since the regulated voltage is supplied from the regulator $ to the AD converter 4 at a constant voltage, the AD turns The normal operation is performed almost independently of the decrease in the battery voltage. As a result, the value of the digital temperature detection signal output from the AD converter 4 when the battery voltage is lowered is smaller than the normal operation when the battery voltage is not lowered, and the digital position is generated. [Problem to be Solved by the Invention] [Problem to be Solved by the Invention] The present invention has been made in view of the above problems, and an object thereof is to provide a temperature measuring system capable of improving the accuracy of a digital temperature detecting signal. [Means for Solving the Problem] The temperature measuring system according to the first aspect of the present invention has a thermistor (21) that outputs a temperature detecting signal of a voltage corresponding to temperature; and an AD converter (19), which is The temperature detection signal outputted by the thermistor performs analog/digital conversion, and the temperature measurement system takes the digitized temperature detection signal into the microcomputer (15), and the temperature measurement system further has: a reference circuit (14) ) 'It uses the power supplied from the battery to generate the reference voltage; the first regulator (16), its use a reference voltage to generate an operating voltage of the thermistor (21); and a second regulator (13) that uses the reference voltage to generate an operating voltage of the AD converter (19). One end of the thermistor (21) is supplied with an operating voltage generated by the first regulator (16), and the other end of the thermistor (21) 4/] 2 201248131 is via a voltage dividing resistor (R11). Grounding, outputting a temperature detection signal from a connection point of the thermistor (Μ) and the voltage dividing resistor (R11). Preferably, a plurality of the thermistors are provided, and the temperature measuring system U' And a multiplexer (20) that selects one of the temperature detection signals output by the plurality of thermistors to supply to the AD (19). . Preferably, the plurality of thermistors (21 to 23) measure the temperature of the pin bottom heated by the plurality of gas burners. – In addition, the reference symbols in the above brackets are marked for easy understanding, and are merely examples, and are not limited to the illustrated form. [Effect of the Invention] According to the present invention, the accuracy of the digital temperature detection signal can be improved. [Embodiment] Hereinafter, embodiments of the present invention will be described with reference to the drawings. <Structure of Temperature Measuring System> Fig. 1 is a circuit configuration diagram of an embodiment of a temperature measuring system of the present invention. In the ffi 1 'the battery U is supplied to the entire temperature measuring system 1 电源 power supply VCC. The negative electrode of the battery 11 is grounded, and the positive electrode is adjusted for the digital circuit 12, the regulator 13 for the analog circuit, and the reference circuit Μ. The regulator 12 for the digital circuit is supplied from the battery K to the microcomputer 15 as a power supply voltage Vccl. The H 13 supply power source vcc is adjusted from the battery η ^ analog circuit (4), and the reference voltage is supplied from the reference power foot 14 to the regulator 13 for the analog circuit, and the power supply voltage Vee2 (for example, 2 qing) is generated by the voltage Vref, and the power supply is applied. c c2 is supplied to the thermistor for adjustment of $ i 6 , i 7 , i 8 and α 〇 conversion difference 19 〇, ' 5/12 201248131 „ adjustment of the regulator 12 and the analog circuit for the digital circuit like this = The separation is to prevent generation in the digital circuit, that is, the microcomputer 15. The frequency noise is mixed into the reference circuit 14, the thermistor adjusters ι6, ι7, 18, and the AD converter 19. The reference circuit Μ will be from the battery 11 The supplied power supply vcc is regulated to generate f electric dust Vref (for example, ι.5ν;) ', and the reference cake v is supplied to the regulator 13 for the circuit and the thermistor regulator 16, Η, Μ. 2 is an electric diagram of an embodiment of the regulator 13 for analog circuits. The regulator U is composed of an operational amplifier (10), a p-channel eraser crystal, and a series-connected resistor Ra, Rb. To the operational amplifier 〇p〇 = phase input terminal supply reference voltage, operational amplifier (10) The inverting terminal is connected to the connection point of the resistors Ra and Rb. The output terminal of the operational amplifier 〇p〇 is connected to the gate of the MOS transistor M0. The power supply vcc, MOS is supplied from the battery Π to the source of the MOS transistor M0. The drain of the crystal M0 is connected to one end of the resistor Ra, and the other end of the resistor is grounded. The operational amplifier 〇p〇 operates to make the transition from the resistance point, the rib connection point, and the reference voltage (four), thereby making The voltage Vec2 output from the drain of the MOS transistor M0 is, for example, a constant voltage. In Fig. 1, the thermistor adjustment H 16 is composed of an operational amplifier OP1, a p-channel MOS transistor M1, and a series-connected resistor r^r2. Supply the reference voltage to the non-inverting input terminal of the operational amplifier OPi, and connect the inverting input terminal to the connection point of the resistors R1 and R2. The output terminal of the operational amplifier ορι is connected to the thumb of the M〇s transistor 。ι. A selection signal is supplied from the microcomputer 15 to the gate of the M〇s transistor M1. ' 6/12 201248131 The power supply voltage V (x2, resistance R1) is supplied from the regulator 13 for the analog circuit to the source of the M〇s transistor Μ1. The end of the drain with the M〇s transistor milk , Another resistor R2 - ^ ⑽ grounded operational amplifier operates such that the feedback from a connection point of the resistor (iv) in the reference voltage RhR2
Vref相同，由此，使從M〇s電晶體組的漏極輸出的電墨 Vcc3為例如1.9V等固定電壓。 此外，MOS電晶體Ml的漏極經由端子THl與熱敏電 阻21的-端連接。熱敏電阻21的另一端經由分壓電阻rii 接地。熱敏電阻21與分壓電阻R11的連接點經由端子ani 與多工器（multiplexer) 20連接，向多工器2〇的開關施 供給熱敏電阻21的溫度檢測信號（電壓）。 熱敏電阻用調節器17由運算放大器〇p2、p溝道撾〇8 電晶體M2、㈣連接的電阻R3、R4構成。向運算放大器 OP2的同相輸入端子供給基準電壓Vref，運算放大器〇打 的反相輸入端子與電阻R3、R4的連接點連接。運算放大器 OP2的輸出端子與M0S電晶體M2的柵極連接。:外，從 微電腦15向MOS電晶體M2的栅極供給選擇信號。 從類比電路用的調節器13向M0S電晶體Mu2的源極 供給電源電壓Vcc2，電阻R3的一端與MOS電晶體M2的 漏極連接，電阻R4的另一端接地。運算放大器〇p2進行 工作以使從電阻R3、R4的連接點回饋的電壓與基準電壓 Vref相同’由此，使從M〇s電晶體M2的漏極輸出的電麗 Vcc4為例如1.9V等固定電壓。 此外，MOS電晶體M2的漏極經由端子TH2與熱敏電 阻22的一端連接。熱敏電阻22的另一端經由分壓電阻Ru 接地。熱敏電阻22與分壓電阻R12的連接點經由端子an2 7/12 201248131 與多工S 20連接’向多工器2〇的開關勘供給熱敏電阻 22的溫度檢測信號（電壓）。 熱敏電阻賴節器18由運算放大器〇p3、p溝道M〇s 電晶體M3、串聯連接的電阻^、R6構成。向運算放大器 OP3的同相輸入端子供給基準電壓Vref，運算放大器〇p3 的反相輸入端子與電阻R5、R6的連接點連接。運算放大器 OP3的輸出端子與M0S電晶體M3的柵極連接。:外，從 k電細15向MOS電晶體M3的栅極供給選擇信號。 從類比電路用的調節器13向M0S電晶體M3的源極 供給電源電壓Vcc2 ’電阻R5的一端與MOS電晶體M3的 漏極連接，電阻R6的另一端接地。運算放大器op]進行 工作以使從電阻R5、R6的連接點回饋的電壓與基準電壓 Vref相同，由此，使從MOS電晶體M3的漏極輸出的電壓 Vcc5為例如1.9V等固定電壓。 此外，MOS電晶體M3的漏極經由端子TH3與熱敏電 阻23的一端連接。熱敏電阻23的另一端經由分壓電阻Rl3 接地。熱敏電阻23與分壓電阻R13的連接點經由端子AN3 與多工器20連接，向多工器20的開關20c供給熱敏電阻 23的溫度檢測信號（電壓）。 多工器20具有開關20a、20b、20c’通過來自微電腦 15的控制使開關20a、20b、20c中的某一個接通，向Ad 轉換器19供給溫度檢測信號。 從類比電路用的調節器13向AD轉換器19供給電源 電壓Vcc2，以該電源電壓Vcc2為基準，將熱敏電阻21〜23 的溫度檢測信號數位化。 微電腦15向MOS電晶體Ml的栅極供給高阻抗 8/12 201248131 (Hiz)、向MOS電晶體M2、M3的柵極供給高電平（H) 的選擇信號’使熱敏電阻21〜23中僅熱敏電阻21工作，並 且使多工器20的開關20a〜20c中僅開關20c接通。由此， 向AD轉換器19供給熱敏電阻21的溫度檢測信號（電壓）， 將其數位化後供給到微電腦15。 此外，微電腦15向MOS電晶體M2的柵極供給高阻 抗（Hiz)、向MOS電晶體]vq、M3的柵極供給高電平（H) 的選擇信號，使熱敏電阻21〜23中僅熱敏電阻22工作，並Vref is the same, whereby the electric ink Vcc3 output from the drain of the M?s transistor group is a fixed voltage such as 1.9V. Further, the drain of the MOS transistor M1 is connected to the - terminal of the thermistor 21 via the terminal TH1. The other end of the thermistor 21 is grounded via a voltage dividing resistor rii. The connection point of the thermistor 21 and the voltage dividing resistor R11 is connected to the multiplexer 20 via the terminal ani, and the temperature detecting signal (voltage) of the thermistor 21 is supplied to the switch of the multiplexer 2A. The thermistor regulator 17 is composed of an operational amplifier 〇p2, a p-channel 〇8 transistor M2, and (4) connected resistors R3 and R4. The reference voltage Vref is supplied to the non-inverting input terminal of the operational amplifier OP2, and the inverting input terminal of the operational amplifier is connected to the connection point of the resistors R3 and R4. The output terminal of the operational amplifier OP2 is connected to the gate of the MOS transistor M2. In addition, a selection signal is supplied from the microcomputer 15 to the gate of the MOS transistor M2. The power supply voltage Vcc2 is supplied from the regulator 13 for the analog circuit to the source of the MOS transistor Mu2, one end of the resistor R3 is connected to the drain of the MOS transistor M2, and the other end of the resistor R4 is grounded. The operational amplifier 〇p2 operates so that the voltage fed back from the connection point of the resistors R3 and R4 is the same as the reference voltage Vref. Thus, the battery output Vcc4 output from the drain of the M〇s transistor M2 is fixed, for example, 1.9V or the like. Voltage. Further, the drain of the MOS transistor M2 is connected to one end of the thermistor 22 via the terminal TH2. The other end of the thermistor 22 is grounded via a voltage dividing resistor Ru. The connection point of the thermistor 22 and the voltage dividing resistor R12 is connected to the multiplexer S 20 via the terminal an2 7/12 201248131, and the temperature detection signal (voltage) of the thermistor 22 is supplied to the switch of the multiplexer 2A. The thermistor riser 18 is composed of an operational amplifier 〇p3, a p-channel M〇s transistor M3, and a series-connected resistor ^, R6. The reference voltage Vref is supplied to the non-inverting input terminal of the operational amplifier OP3, and the inverting input terminal of the operational amplifier 〇p3 is connected to the connection point of the resistors R5 and R6. The output terminal of the operational amplifier OP3 is connected to the gate of the MOS transistor M3. In addition, a selection signal is supplied from the k-electrode 15 to the gate of the MOS transistor M3. The power supply voltage Vcc2 is supplied from the regulator 13 for analog circuits to the source of the MOS transistor M3. One end of the resistor R5 is connected to the drain of the MOS transistor M3, and the other end of the resistor R6 is grounded. The operational amplifier op is operated such that the voltage fed back from the connection point of the resistors R5 and R6 is the same as the reference voltage Vref, whereby the voltage Vcc5 output from the drain of the MOS transistor M3 is a fixed voltage such as 1.9V. Further, the drain of the MOS transistor M3 is connected to one end of the thermistor 23 via the terminal TH3. The other end of the thermistor 23 is grounded via a voltage dividing resistor Rl3. The connection point of the thermistor 23 and the voltage dividing resistor R13 is connected to the multiplexer 20 via the terminal AN3, and the temperature detection signal (voltage) of the thermistor 23 is supplied to the switch 20c of the multiplexer 20. The multiplexer 20 has switches 20a, 20b, and 20c' that turn on one of the switches 20a, 20b, and 20c by control from the microcomputer 15, and supplies a temperature detection signal to the Ad converter 19. The power supply voltage Vcc2 is supplied from the regulator 13 for the analog circuit to the AD converter 19, and the temperature detection signals of the thermistors 21 to 23 are digitized based on the power supply voltage Vcc2. The microcomputer 15 supplies a high impedance 8/12 201248131 (Hiz) to the gate of the MOS transistor M1, and supplies a high level (H) selection signal to the gates of the MOS transistors M2 and M3 to make the thermistors 21 to 23 Only the thermistor 21 operates, and only the switch 20c of the switches 20a to 20c of the multiplexer 20 is turned on. Thereby, the temperature detection signal (voltage) of the thermistor 21 is supplied to the AD converter 19, digitized, and supplied to the microcomputer 15. Further, the microcomputer 15 supplies a high impedance (Hiz) to the gate of the MOS transistor M2, and supplies a high level (H) selection signal to the gates of the MOS transistors]vq and M3, so that only the thermistors 21 to 23 are included. The thermistor 22 works, and
时^ ,八巧恐似电，迅zz的溫度檢測信號（電壓）， 將其數位化後供給到微電腦15。 的選擇信號， ，使熱敏電阻21〜23中僅熱敏電阻23When ^, Baqiao is like electricity, Xunzz's temperature detection signal (voltage), which is digitized and supplied to the microcomputer 15. Selection signal, so that only the thermistor 23 of the thermistors 21 to 23
向AD轉換器19供給熱敏電阻23 將其數位化後供給到微電腦15。 微電腦15取入熱敏電阻21〜;2 此外’ Μ電腦15向MOS電晶體]vi3的柵極供給高阻 抗（HiZ)、向M0S電晶體Μ卜M2的柵極供給高電平（Η) ，丨罜热敏冤阻23工作，並 霞開關20a接通。由此， 的溫度檢測信號（電壓）， 23各自輸出的數位的溫度The thermistor 23 is supplied to the AD converter 19, and is digitized and supplied to the microcomputer 15. The microcomputer 15 takes in the thermistors 21 to 2, and supplies a high impedance (HiZ) to the gate of the MOS transistor vi3, and supplies a high level (Η) to the gate of the MOS transistor M2. The thermal resistor 23 operates and the switch 20a is turned on. Thus, the temperature detection signal (voltage), 23 the temperature of each digit of the output
9/12 201248131 16〜18 一祕據從參考魏Η供給的鱗雜财生成電 源⑽2、Μ〜Vee5 °因此，即使電池11的電壓變動導致 基準電壓W變動，電源Vee2和ν(χ3〜νΜ也以相同的 比例變動’使用VCC2來進行AD轉換的AD轉換器d中 的LSB (最下位比特位）以與基準電壓㈣的變動相同的 比例進行變動。 結果是，電池電壓降低時的AD轉換器19輸出的數位 溫度檢測信號的值為與電池電壓沒有降低的通常動作時相 同的值，從而提高數位溫度檢測信號的精度。 【圖式簡單說明】 圖1是本發明的溫度測量系統的一個實施方式的電路 結構圖。 圖2疋類比電路用的调節器的一個貫施方式的電路圖。 圖3是現有的溫度測量系統的一個例子的電路結構圖。 【主要元件符號說明】 1 熱敏電阻 2 電池 3 分壓電阻 4 AD轉換器 5 調節器 6 微電腦 10 溫度測量系統 11 電池 12 調節器 13 類比電路用的調節器 14 參考電路 10/12 15 201248131 16、17、18 19 20 20a ' 20b ' 20c 21 ' 22 ' 23 AN1 ' AN2 ' AN3 MO 〜M39/12 201248131 16~18 The secret source generates power (10)2, Μ~Vee5 ° from the reference to Wei Wei. Therefore, even if the voltage fluctuation of the battery 11 causes the reference voltage W to vary, the power supplies Vee2 and ν (χ3~νΜ also The LSB (lowest bit) in the AD converter d that performs AD conversion using VCC2 fluctuates at the same ratio as the fluctuation of the reference voltage (four). The result is an AD converter when the battery voltage is lowered. The value of the digital temperature detection signal outputted by 19 is the same as the normal operation time when the battery voltage is not lowered, thereby improving the accuracy of the digital temperature detection signal. [Schematic Description] FIG. 1 is an implementation of the temperature measurement system of the present invention. Fig. 2 is a circuit diagram of an embodiment of a regulator for analog circuits. Fig. 3 is a circuit diagram of an example of a conventional temperature measuring system. [Description of main components] 1 Thermistor 2 Battery 3 Voltage divider resistor 4 AD converter 5 Regulator 6 Microcomputer 10 Temperature measurement system 11 Battery 12 Regulator 13 Regulator for analog circuits 14 Reference Circuit 10/12 15 201248131 16,17,18 19 20 20a ' 20b ' 20c 21 ' 22 ' 23 AN1 ' AN2 ' AN3 MO ~M3
Ra、Rb、R1 〜R13 TH1 ' TH2 > TH3 OPO-OP3Ra, Rb, R1 ~ R13 TH1 ' TH2 > TH3 OPO-OP3
Vcc、Vccl〜Vcc5Vcc, Vccl~Vcc5
Vref 微電腦 熱敏電阻用調節器 AD轉換器 多工器 開關 熱敏電阻 端子 MOS電晶體 電阻 端子 運算放大器 電壓電源 基準電壓 11/12Vref Microcomputer Thermistor Regulator AD Converter Multiplexer Switch Thermistor Terminal MOS Transistor Resistor Terminal Operational Amplifier Voltage Supply Reference Voltage 11/12