CN201707908U - Buzzer driving circuit of oven timer - Google Patents
Buzzer driving circuit of oven timer Download PDFInfo
- Publication number
- CN201707908U CN201707908U CN2010201944686U CN201020194468U CN201707908U CN 201707908 U CN201707908 U CN 201707908U CN 2010201944686 U CN2010201944686 U CN 2010201944686U CN 201020194468 U CN201020194468 U CN 201020194468U CN 201707908 U CN201707908 U CN 201707908U
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- buzzer
- triode
- driving circuit
- resistor
- terminal inductor
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Abstract
A buzzer driving circuit of an oven timer comprises a buzzer and a triode, wherein a base electrode of the triode acquires pulse via a sampling resistor, an emitter electrode of the triode is grounded, and a collector electrode thereof is also connected with a resistor. The buzzer driving circuit is characterized by further comprising a three-terminal inductor, two terminals of the three-terminal inductor are connected with the buzzer, one of the two terminals is connected with the resistor of the collector electrode of the triode, a center axle housing of the three-terminal inductor is connected with a power source signal, and the buzzer is further connected with a shunt resistor. By aid of a voltage boosting function of the three-terminal inductor, the pulse signal sent from and controlled by the triode is promoted into a sharp pulse with higher peak value, and the buzzer makes a loud sound according to the peak value, thereby resolving the problem that sound of the buzzer is lower when the buzzer works in environments with lower voltage. Further, the buzzer driving circuit is low in cost and simple in structure, is most suitable for household appliances such as ovens, and can meet the characteristics of long working time and high working temperature of ovens.
Description
Technical field
The utility model relates to a kind of control circuit of household electrical appliance, the buzzer circuit in the timer circuit on particularly a kind of baking box.
Background technology
After continuous working, need in the self-braking household electrical appliance, the timer parts that are absolutely necessary, and much all cooperate hummer work, produce audible alarm and in time carry out follow-up operation to remind the user.Such as baking box, run duration is longer, dozens of minutes even one or two hour, and timer sends the sound to the time automatic shutdown circuit and by hummer, allows the user come the article of baking are taken away.The buzzer drive circuit of existing baking box timer all is to adopt triode to form pulse control circuit.As shown in Figure 1 be exactly an example of typical transistor drive circuit: three switching tubes cooperate resistor-capacitor units to form a switch amplifying circuit, and the square-wave pulse of control input drives hummer and sounds.Sort circuit is simple in structure, is the triode application examples of using always.And shortcoming is: when operating voltage was low, the driving voltage that hummer obtains was also very low, and the sound that sends will be very little.Be used in above this household electrical appliances of baking box, because the power grid environment more complicated, the situation of low pressure operation is very common, and above-mentioned shortcoming will clearly manifest, and influences the prompting effect of whole baking box timer.
Summary of the invention
The objective of the invention is to solve the technological deficiency of the described existing transistor drive circuit of background technology, design a kind of buzzer drive circuit that is used on the baking box timer, make it produce higher voltage and supply with hummer, solve the too low problem of sound by lower operating voltage.
This buzzer circuit is such: contain hummer and triode, the base stage of triode is obtained pulse by sample resistance, emitter grounding, also be connected with resistance on the collector, it is characterized in that: also contain one three end inductance, the two ends of three end inductance connect hummer, have an end to link to each other with the resistance of transistor collector in these two ends, connect power supply signal on the central shaft heads of three end inductance, on the hummer also and a shunt resistance arranged.
The beneficial effects of the utility model are to utilize the boosting of three end inductance, the pulse signal of coming is carried in triode control, lifting is a pointed pulse that high peaks is arranged, utilize this peak value to make hummer send higher sound, so just solved ambient voltage also low problem of hummer sound when low.And the components and parts that use are few, cost is low, and structure is also simple, moves more reliable.Be applied in above this household electrical appliances of baking box the most suitablely, can satisfy the characteristics that the baking box working time is long, working temperature is high.
Description of drawings
Fig. 1, the buzzer circuit that original traditional triode drives; Fig. 2, application principle figure of the present utility model; Fig. 3, original driving circuit and the utility model circuit, the pulse waveform comparison diagram on hummer.
Embodiment
As shown in Figure 2, be parallel with resistance R 3 on the hummer BUZ, and be connected in series three end inductance L 1, behind resistance in series R2, be connected to switch triode Q1.Connect power supply signal VCC on the central shaft heads of three end inductance L 1.After the square-wave pulse input, enter switching tube Q1 by sample resistance R1, the collector output from switching tube Q1 enters three end inductance L 1 through resistance R 2 again.By the boost function of three end inductance L 1, the square wave arteries and veins is from just being promoted to the higher pointed ripple of peak value, as shown in Figure 3.Utilize the crest voltage of this pointed ripple to drive hummer, sound can significantly improve.
What present embodiment was given an example is a kind of circuit composition form; but be not limited to this; utilize switch controlled signal break-make, utilize three end inductance to promote peak value of pulse again; the final hummer that drives is sounded; application circuit with this principle composition; even hold some variation of resistor in the concrete circuit composition mode, also within protection domain of the present utility model.
Claims (2)
1. the buzzer drive circuit of a baking box timer, contain hummer BUZ and triode Q1, the base stage of triode Q1 is obtained pulse by sample resistance R1, it is characterized in that: also contain one three end inductance L 1, the two ends of three end inductance L 1 connect hummer BUZ, connect power supply signal on the central shaft heads of three end inductance L 1.
2. the buzzer drive circuit of a kind of baking box timer according to claim 1, it is characterized in that: described hummer BUZ goes up also and a shunt resistance R3 is arranged, the emitter grounding of triode Q1, also being connected with on the collector in the two ends of resistance R 2, three end inductance L 1 has an end to link to each other with the resistance R 2 of triode Q1 collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201944686U CN201707908U (en) | 2010-05-19 | 2010-05-19 | Buzzer driving circuit of oven timer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201944686U CN201707908U (en) | 2010-05-19 | 2010-05-19 | Buzzer driving circuit of oven timer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201707908U true CN201707908U (en) | 2011-01-12 |
Family
ID=43445063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201944686U Expired - Fee Related CN201707908U (en) | 2010-05-19 | 2010-05-19 | Buzzer driving circuit of oven timer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201707908U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI460716B (en) * | 2012-05-29 | 2014-11-11 |
-
2010
- 2010-05-19 CN CN2010201944686U patent/CN201707908U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI460716B (en) * | 2012-05-29 | 2014-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110112 Termination date: 20190519 |