CN2137379Y - Alarm for prevention of lifting quilt off - Google Patents
Alarm for prevention of lifting quilt off Download PDFInfo
- Publication number
- CN2137379Y CN2137379Y CN 92221390 CN92221390U CN2137379Y CN 2137379 Y CN2137379 Y CN 2137379Y CN 92221390 CN92221390 CN 92221390 CN 92221390 U CN92221390 U CN 92221390U CN 2137379 Y CN2137379 Y CN 2137379Y
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- Prior art keywords
- circuit
- temperature
- utility
- quilt
- model
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model provides a reminder for preventing children from stepping a quilt, which is a reminding device for preventing children from stepping quilt. The utility model is composed of a thermistor, an integrated electronic component, etc. In the utility model, the temperature measurement technology of the thermistor is utilized to convert temperature on the surface of a child's pajama to a voltage signal. When the temperature on the surface of the child's pajama is reduced because a quilt is stepped away, the voltage signal is also reduced along with the temperature; when the signal is reduced to a given threshold value, a threshold detection circuit is turned over, and a sound circuit is driven to operate. Accordingly, the reminding function of the utility model is achieved. The utility model has the advantages of handy structure, slight power consumption, sensitive and fast temperature response, adjustable temperature threshold, etc.
Description
The utility model belongs to the application of electronic technology field.
Children are owing to lack self-control, often unconsciously quilt are pedaled at night to hold but can oneself not cover, thereby are caused catching a cold.Because it is irregular that children are pedaled, in order in time to cover quilt for child at night, it is not steady and sure that the heads of a family may sleep whole night; If owing to reasons such as fatigue are slept too heavyly, then therefore child can catch a cold again.To this contradiction, the heads of a family feel worried deeply and still do not have good plan at present.
The purpose of this utility model is to provide a kind of temperature with the sleeping suit for children appearance to reduce the alarm set that converts voice signal to.
Basic functional principle of the present utility model is: the temperature of utilization thermistor temperature detecting commercial measurement sleeping suit for children appearance, and convert voltage signal to.When the temperature of sleeping suit for children appearance owing to quilt is pedaled out when reducing, this voltage signal also decreases.When signal was reduced to given threshold value, the threshold detection circuit upset drove phonation circuit work, thereby finishes prompting function.
This device is made up of temperature measuring circuit T, threshold detection circuit TH, phonation circuit S and battery E.(seeing accompanying drawing one for details)
The temperature measuring circuit T of this device is core parts with thermistor Rt, and threshold detection circuit TH is core parts with the integrated circuit.Because this device powered battery, and cell voltage in use reduces along with the time inevitably, so temperature measuring circuit T and threshold detection circuit TH must design to such an extent that temperature threshold and cell voltage E have nothing to do.According to two kinds of dissimilar integrated circuit that threshold detection circuit TH may adopt, provide two kinds of design proposals as follows:
Scheme one: utilize the CMOS logical integrated circuit to constitute threshold detection circuit TH.The circuit of this scheme is seen accompanying drawing two, and temperature measuring circuit constitutes a bleeder circuit by fixed resistance R1 and thermistor Rt, and circuit two terminates at power supply E two ends, and dividing point is connected on the input end of CMOS logical integrated circuit IC1, and its current potential U is
U＝E (Rt)/(R1＋Rt) （1）
The upset level U of CMOS logical integrated circuit IC1
TBe detection threshold.According to CMOS logical integrated circuit principle, its upset level U
TBe always half of supply voltage, promptly
U
T＝ 1/2 E （2）
Work as U=U
TThe time, the testing circuit upset.With this condition substitution (1) formula and (2) formula, the condition of testing circuit upset is as can be known
Rt＝R1 （3）
By following formula as can be known, testing circuit turn threshold and independent of power voltage are because Rt is the single-valued function of temperature, so temperature threshold and independent of power voltage.
Scheme two: adopt linear integrated circuit to constitute threshold detection circuit TH.The circuit of this scheme is seen accompanying drawing three, temperature measuring circuit constitutes an electric bridge by fixed resistance R1, R2, R3 and thermistor Rt, two diametrical connections of electric bridge are at power supply E two ends, and two diametrical connections are at two input ends of an integrated operational amplifier (or voltage comparator) A in addition.The equilibrium point of this electric bridge is the turn threshold U of testing circuit
TAccording to the bridge balance principle, the condition of testing circuit upset is as can be known
(R1)/(Rt) ＝ (R2)/(R3) （4）
So temperature threshold and independent of power voltage.
In the ordinary course of things, temperature threshold is about about 28 degrees centigrade, but considers the variation of children's individual difference, clothing difference and environment temperature, and this threshold value must be able to be adjusted by the user within the specific limits voluntarily.The utility model is provided with a threshold value and adjusts potentiometer W, threshold value is adjusted potentiometer W and R1 series connection, at this moment, (3) R1 in formula and (4) formula becomes R1+W, according to (3) formula and (4) formula, this moment, temperature threshold was relevant with W as can be known, and the user adjusts potentiometer W by adjusting threshold value, just can realize the adjustment to temperature threshold.
The phonation circuit of this device can be used any one audio frequency oscillator.More clear for the warning that this device is sent, can modulate sound signal.For reducing electrical source consumption, microphone device should adopt piezoelectric ceramics piezo low in energy consumption.
The utlity model has structure light and handy (weight is less than 50 grams), electrical source consumption atomic (the not sounding power consumption of scheme one is less than 0.00005 watt), advantage such as temperature-responsive is rapidly sensitive, and temperature threshold is adjustable.
Fig. 1 is the theory diagram of children's quilt-kicking warner.Form by temperature measuring circuit T, threshold detection circuit TH, phonation circuit S and battery E.
Fig. 2 is the temperature survey and the threshold detection circuit schematic diagram of scheme one.By thermistor Rt, preset potentiometer W, fixed resistance R1 and CMOS logical integrated circuit IC
1Constitute.
Fig. 3 is the temperature survey and the threshold detection circuit schematic diagram of scheme two.Constitute by thermistor Rt, preset potentiometer W, fixed resistance R1, R2, R3 and integrated operational amplifier (or voltage comparator) A.
Fig. 4 is the enforcement circuitry schematic diagram of scheme one.
Thermistor Rt(negative temperature coefficient temperature sensor) constitutes temperature measuring circuit with preset potentiometer W, fixed resistance R1.CMOS logical integrated circuit IC
1, IC
2Constitute threshold detection circuit (Schmidt trigger) with resistance R 4.CMOS logical integrated circuit IC
3, IC
4With the modulating oscillator of resistance R 5, R6 and capacitor C 1 formation multivibrator form, oscillation frequency is about 1-3Hz.CMOS logical integrated circuit IC
5, IC
6, resistance R 7 and piezoelectric ceramics piezo PC constitute the audio frequency oscillator of multivibrator form, after this audio frequency oscillator is subjected to the modulation of modulating oscillator, drive pressure electroceramics piezo PC sounding.Diode D1 and D2 play the effect of modulation switch, when dut temperature when temperature threshold is above, IC
2The output high level, the equal conducting of diode D1 and D2, two multivibrators are forced to failure of oscillation; When dut temperature when temperature threshold is following, IC
2Output low level, diode D1 ends, and multivibrator is started working.
Claims (3)
1, children's quilt-kicking warner is made up of temperature measuring circuit T, threshold detection circuit TH, phonation circuit S and battery E, of the present utility model being characterised in that:
Temperature measuring circuit constitutes a bleeder circuit by fixed resistance R1 and thermistor Rt, and circuit two terminates at power supply E two ends, and dividing point is connected on the input end of CMOS logical integrated circuit IC1.
2, children's quilt-kicking warner according to claim 1 is characterized in that being provided with among the temperature measuring circuit T threshold value and adjusts potentiometer W.
3, children's quilt-kicking warner is made up of temperature measuring circuit T, threshold detection circuit TH, phonation circuit S and battery E.Of the present utility model being characterised in that:
Temperature measuring circuit constitutes an electric bridge by fixed resistance R1, R2, R3 and thermistor Rt, and two diametrical connections of electric bridge are at power supply E two ends, and two diametrical connections are at two input ends of an integrated operational amplifier (or voltage comparator) A in addition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92221390 CN2137379Y (en) | 1992-09-28 | 1992-09-28 | Alarm for prevention of lifting quilt off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92221390 CN2137379Y (en) | 1992-09-28 | 1992-09-28 | Alarm for prevention of lifting quilt off |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2137379Y true CN2137379Y (en) | 1993-06-30 |
Family
ID=33768198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92221390 Expired - Fee Related CN2137379Y (en) | 1992-09-28 | 1992-09-28 | Alarm for prevention of lifting quilt off |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2137379Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373325A (en) * | 2016-08-03 | 2017-02-01 | 厦门傅里叶电子有限公司 | Safety prompting method for virtual reality equipment |
-
1992
- 1992-09-28 CN CN 92221390 patent/CN2137379Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373325A (en) * | 2016-08-03 | 2017-02-01 | 厦门傅里叶电子有限公司 | Safety prompting method for virtual reality equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Guangmeng Document name: payment instructions |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |