200842349 九、發明說明： 【發明所屬之技術領域】 本發明係為一種偵测電路，尤指一種濕度感測器之偵 測電路。 【先前技術】 戲敏元件是最簡單的濕度感測器，所以目前的濕度感 測為之偵測電路都使用濕敏元件，然後再於濕敏元件後搭 配訊號處理電路作為後端的處理。 、請參考第一圖，係為習知技術之濕度感測器之偵測電 路示意圖’習知的濕度感測器之偵測電路包括：一交流電 源1 〇 ’用以產生至少一正弦波，一濕度感測元件12，電性 串聯於一電阻14及該交流電源10，一類比/數位轉換電路 16 ’係電性連結於該濕度感測元件12及該電阻14之間， 以取得一類比測量訊號並且將類比測量訊號轉換為數位測 星成號’一微處理器單元16，係接收該數位測量訊號，將 該數值測量訊號與該微處理單元16内部所儲存的溫度調 正表作比較’再將比較結果輸出至一顯示單元18以顯示實 、際的環境濕度。 然而，上述習知技術濕度感測器之偵測電路的製造成 本比不具有類比/數位轉換電路及微處理器單元的濕度感 測器之偵測零路來的高出許多，再者，濕度感測元件是不 可用直流進行量測動作，若使用直流量測會讓濕度感測元 件造成極化反應，致使濕度感测元件失去功能。 200842349 【發明内容】 有鑑於上述習知濕度感測器之❹】電路成本較高以 及濕度感測元件量轉㈣問題，本發明就提出一種有別 於習知技術的濕度感測器之偵測電路。 、本f明的目的在於使用簡單的電路及元件以構成濕 度感測器之偵測電路’達到濕度測量之目的。 為了達成上述之目的，本發明濕度感測器之偵測電 路，包括訊號檢知端，—第_訊號制端 ，係用以接 收ΐ少一，—訊號，將該些第—訊號傳送至一電阻元件之 鈿，第二訊號偵測端，係用以接收至少一第二訊號， 將該些第二職傳送至—濕度感測元件之—端，—電容元 =，忒私各兀件之一端係串聯於該濕度感測元件之另一 而°亥私阻元件之另一端以及該訊號檢知端，用以進行充 放電的動作，藉此，由該第—訊號及鮮三訊颜提供之 2訊號準位，經由該電阻元件以及該濕錢測元件對該 %谷元件進行充放電的動作，j^使得由該訊號檢知端可獲 得至少一量測訊號。 採用本發明之/热度感測态之偵測電路，因利用脈波寬 度測量手段，藉由簡單的充放電電路且並聯參考電阻，上 述的充放電f路是由濕度感測元件與電容所構成，由上述 的電路可以獲得量測電壓而且不需要透過類比/類轉換電 路及微處理器的運作，如此可以達到·量測濕度之目的以及 降低製造的成本。 * 200842349 有關本發明的特徵與實作，茲配合圖示作最佳實施例 詳細說明如下。 - 【實施方式】 請參考第二圖，係為本發明濕度感測器之偵測電路示 意圖，該偵測電路包括一訊號檢知端20，一電阻元件22， 一濕度感測元件24及一電容元件26。 電阻元件22於此發明中為一個參考電阻，濕度感測 元件24可為一濕度感测器。電阻元件22具有兩個端點， 分別為一第一端點220及一第二端點222，濕度感测元件 24也具有兩個端點，分別為一第一端點24(λ及一第二端點 242,電容元件26亦具有兩個端點，分別為一第一端點260 及一第二端點262。 電阻元件22的第二端點222、濕度感測元件24的第 二端點242以及電容元件26的第一個端點260彼此串聯至 訊號檢知端20，用以進行充放電的動作。電阻元件22的 第一端點22Q為一第一訊號偵測端，用以接收至少一第一 訊號。濕度感測元件24的第一端點240為一第二訊號偵測 端，用以接收至少一第二訊號。電容元件26的第二端點 262被連接於地，經由該第一訊號及該第二訊號分別對該 電容元件進行充放電的動作，以使得該訊號檢知端可獲得 至少一量測訊號。 * 上述所提及的第一訊號及第二訊號可為至少一脈衝 訊號。第一訊號偵测端、第二訊號偵測端以及訊號檢知端 7 200842349 20可同時為輸入/輪出端。 本發明濕度感測器之偵測電路初始狀態是訊 端20為輸入狀態、第一訊號偵測端為高電位以及第:¾知 偵測端為高阻抗(HiZ)。請同時參考第三圖，係為 度感測器之偵測電路的充放電階段示意圖，在第t 中，不論第一訊號偵測端及第二訊號偵測端狀態為如喈畏 訊號檢知端20就可以得到資料，而此時電容元件，铃 電荷也會經由訊號檢知端20得到釋放而其電容元件上的 的電荷值亦會被回復為零。 ' 6上 在第二階段中，訊號檢知端20為輪入狀態、第 號偵測端為高阻抗以及第二訊號偵測端為低電位時，釩 電容元件26上的電荷已在第一階段中被釋放，所以在=為 階段中，是不會有電流由第二訊號偵測端流進到電〜第< 26上。 么元件 在第三階段中，訊號檢知端20轉為輸出狀態、第 訊號偵測端為高阻抗以及第二訊號偵測端為高電位時， 時，由第二訊號偵測端不斷地傳輸電流至電容元件26上， 如此電容元件26就會不斷地累積電荷量，同時間，於濕声 感測元件24上亦會因電解效應而積存部份之電荷，若電荷 沒有被完全移除，則會使得濕度感測元件24極化變成永久 性的傷害。^ ’ 透過本發明之第三階段充放電程序，訊號檢知端20 因已轉換為輸出狀態且為低電位，如此累積於濕度感測元 件24以及電荷元件26上的電荷即可回流至訊號檢知端 200842349 ，只要放糾間到達—定的時間，即可完全將電荷移除。 綜上所述，本發明濕度感測器之偵測電路口古、 作比較，可得知藉㈣树充放電電路且並雜考★阻何 六述的充放電電路是㈣度感測元件與電容所構成私由: ΐ::::二:::電壓而且不需要透過類比/類轉換 惟’上述所揭露之圖式、說明，僅為本發明之 凡精于此項技藝者當可依據上述之說明作其二種 之改良，而㈣改變仍屬於本發明之發㈣神相下^ 之專利範圍中。 ’丨疋 【圖式簡單說明】200842349 IX. INSTRUCTIONS: [Technical Field] The present invention is a detection circuit, and more particularly a detection circuit of a humidity sensor. [Prior Art] The touch sensitive component is the simplest humidity sensor, so the current humidity sensing uses the humidity sensor for the detecting circuit, and then the signal processing circuit is used as the back end processing after the humidity sensor. Please refer to the first figure, which is a schematic diagram of a detection circuit of a humidity sensor of the prior art. A conventional humidity sensor detection circuit includes: an AC power source 1 〇' for generating at least one sine wave, A humidity sensing component 12 is electrically connected in series with a resistor 14 and the AC power source 10, and an analog/digital converter circuit 16' is electrically coupled between the humidity sensing component 12 and the resistor 14 to obtain an analogy. Measuring the signal and converting the analog measuring signal into a digital star measuring unit, a microprocessor unit 16, receiving the digital measuring signal, and comparing the numerical measuring signal with a temperature adjustment table stored in the micro processing unit 16 'The comparison result is output to a display unit 18 to display the actual ambient humidity. However, the manufacturing cost of the detection circuit of the above-mentioned conventional humidity sensor is much higher than that of the humidity sensor without the analog/digital conversion circuit and the microprocessor unit, and further, the humidity The sensing component is not available for measurement by DC. If the DC measurement is used, the humidity sensing component will cause a polarization reaction, causing the humidity sensing component to lose its function. 200842349 [Summary of the Invention] In view of the above-mentioned conventional humidity sensor, the circuit cost is high and the humidity sensing component is rotated (four), the present invention proposes a detection of a humidity sensor different from the prior art. Circuit. The purpose of this invention is to use a simple circuit and components to form the detection circuit of the humidity sensor to achieve the purpose of humidity measurement. In order to achieve the above object, the detection circuit of the humidity sensor of the present invention includes a signal detecting end, and the first signal terminal is configured to receive a minus one, a signal, and transmit the first signal to the first signal. The second signal detecting end is used to receive at least one second signal, and the second job is transmitted to the end of the humidity sensing component, the capacitor element =, and the components of the security component are One end is connected in series to the other end of the humidity sensing element, and the other end of the temperature sensing element and the signal detecting end are used for charging and discharging, thereby being provided by the first signal and the fresh three-spot The 2 signal level is used to charge and discharge the % valley element via the resistor element and the wet money measuring component, so that at least one measurement signal is obtained by the signal detecting end. According to the detection circuit of the thermal sensing state of the present invention, the above-mentioned charging and discharging circuit is composed of a humidity sensing element and a capacitor by using a pulse width measuring means, a simple charging and discharging circuit and a parallel reference resistor. The above-mentioned circuit can obtain the measurement voltage and does not need to pass through the operation of the analog/class conversion circuit and the microprocessor, so that the purpose of measuring the humidity and reducing the manufacturing cost can be achieved. * 200842349 The features and implementations of the present invention are described in detail with reference to the preferred embodiments. - [Embodiment] Please refer to the second figure, which is a schematic diagram of a detection circuit of the humidity sensor of the present invention. The detection circuit includes a signal detecting end 20, a resistive element 22, a humidity sensing element 24 and a Capacitor element 26. Resistive element 22 is a reference resistor in this invention and humidity sensing element 24 can be a humidity sensor. The resistive element 22 has two end points, respectively a first end point 220 and a second end point 222. The humidity sensing element 24 also has two end points, respectively a first end point 24 (λ and one The two end points 242, the capacitive element 26 also has two end points, respectively a first end point 260 and a second end point 262. The second end point 222 of the resistive element 22, the second end of the humidity sensing element 24 Point 242 and the first end point 260 of the capacitive element 26 are connected in series to the signal detecting end 20 for charging and discharging. The first end 22Q of the resistive element 22 is a first signal detecting end for Receiving at least one first signal. The first end point 240 of the humidity sensing component 24 is a second signal detecting end for receiving at least one second signal. The second end point 262 of the capacitive element 26 is connected to the ground. And charging and discharging the capacitive element respectively through the first signal and the second signal, so that the signal detecting end obtains at least one measuring signal. * The first signal and the second signal mentioned above may be At least one pulse signal, the first signal detection end, the second signal detection end, and the signal The detection terminal 7 200842349 20 can be the input/round output at the same time. The initial state of the detection circuit of the humidity sensor of the present invention is that the signal terminal 20 is in an input state, the first signal detection terminal is at a high potential, and the first: The detection end is high impedance (HiZ). Please refer to the third picture at the same time, which is the charging and discharging stage diagram of the detection circuit of the degree sensor. In the tth, regardless of the first signal detection end and the second signal detection The state of the measuring end is as long as the detecting end 20 of the fear signal can obtain the data, and at this time, the capacitive element, the bell charge is also released through the signal detecting end 20 and the electric charge value on the capacitive element is also restored to zero. In the second stage, when the signal detecting end 20 is in the wheeling state, the first detecting end is high impedance, and the second signal detecting end is low, the charge on the vanadium capacitive element 26 is already in the first stage. It is released in one stage, so in the stage of =, there is no current flowing from the second signal detecting end to the electric ~ the second <26. In the third stage, the signal detecting end 20 turns For the output state, the signal detection end is high impedance and the second signal detection end is At a high potential, the second signal detecting end continuously transmits current to the capacitive element 26, so that the capacitive element 26 continuously accumulates the amount of charge, and at the same time, the wet acoustic sensing element 24 is also electrolyzed. The effect of accumulating part of the charge, if the charge is not completely removed, will cause the humidity sensing element 24 to become permanent damage. ^ ' Through the third stage charge and discharge procedure of the present invention, the signal detection end 20 Since the output state is low and the potential is low, the charge accumulated on the humidity sensing element 24 and the charge element 26 can be returned to the signal detecting end 200842349, and the time can be completely settled by the time of the correction. In view of the above, the detection circuit of the humidity sensor of the present invention is ancient and comparative, and it can be known that the charge and discharge circuit of the (four) tree charge and discharge circuit and the miscellaneous test The sensing element and the capacitor constitute the private: ΐ::::2::: voltage and does not need to pass analogy/class conversion. Only the above-mentioned diagrams and descriptions are only the skill of the present invention. If you can follow the instructions above As a result of the improvement of the two kinds, and (4) the change still belongs to the patent range of the hair of the invention (4).丨疋 [Simplified illustration]
第一圖係為習知技術之濕度感測器之_電路示音圖. 第，，本發明濕度感測器之偵測電路示意圖了及’ 弟^係為本發明濕度制器之_電路的充放電階段 【主要元件符號說明】 交流電源 10 濕度感測元件 12 電阻· 14 類比/數仇轉換電路16· 顯示單元 \8 訊號檢知纟帛 20 260 22 200842349 電阻元件 濕度感測元件 電容元件 第一端點 ^ 、第二端點 24 26 220、240 222 > 242 262The first figure is a circuit diagram of a humidity sensor of the prior art. First, the detection circuit of the humidity sensor of the present invention is schematic and the circuit is the circuit of the humidity device of the present invention. Charging and discharging stage [Main component symbol description] AC power supply 10 Humidity sensing component 12 Resistor · 14 analog / digital conversion circuit 16 · Display unit \ 8 Signal detection 纟帛 20 260 22 200842349 Resistive component humidity sensing component Capacitance component An endpoint ^, a second endpoint 24 26 220, 240 222 > 242 262
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