CN103093573B - The smog alarm circuit of tool mute function and quiet implementation method thereof - Google Patents
The smog alarm circuit of tool mute function and quiet implementation method thereof Download PDFInfo
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- CN103093573B CN103093573B CN201110339506.1A CN201110339506A CN103093573B CN 103093573 B CN103093573 B CN 103093573B CN 201110339506 A CN201110339506 A CN 201110339506A CN 103093573 B CN103093573 B CN 103093573B
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Abstract
The invention discloses a kind of smog alarm circuit of tool mute function and quiet implementation method thereof, this smog alarm circuit is except comprising smoke signal receiver module, amplifying circuit, smokescope comparator circuit and warning circuit, also comprise: threshold concentration selector switch, at least there are two input ends, be connected with film mist compare threshold and dense smoke mist compare threshold respectively, this threshold concentration selector switch carries out to two compare thresholds the second input end that selection outputs to this smokescope comparator circuit under the control of the control signal of control end; And control circuit, its one end is connected to a TEST button, and the other end is connected to the control end of this threshold concentration selector switch, for generation of the selection controlling compare threshold, by above-mentioned means, present invention achieves and can press to the artificial smog initiatively produced the object that TEST key enters mute function.
Description
Technical field
The present invention relates to a kind of smog alarm circuit and method thereof, particularly relate to a kind of smog alarm circuit of tool mute function and quiet implementation method thereof.
Background technology
At present, traditional smog alarm circuit as shown in Figure 1, traditional smog alarm circuit comprises infrared receiving circuit Ired, amplifier AMP, smokescope comparer COMP and warning circuit, it receives the infrared ray from photoelectricity storehouse by photodiode, its smokescope is higher, infrared light is stronger, (electric capacity 4.7nF is comprised through a low pass shaping circuit, 47nF and resistance 560 Ω, 250k Ω) amplified by amplifier AMP again after filtering high frequency interference, export the input end in1 of AMP_output to smokescope comparer COMP, compare with the film mist alarm threshold value Vref1 that only has of the input end in2 of smokescope comparer COMP, export comparative result COMP_output to warning circuit, if the signal being input to input end in1, lower than Vref1, is reported to the police, owing to only there being a film mist alarm threshold value voltage Vref1, therefore also can report to the police for the artificial smog initiatively produced, but can not be quiet, as the smog etc. that stir-frying in kitchen oil smoke and smoking produce, therefore artificial silent mode (Timer Mode) is initiatively needed.For realizing mute function, the sensitivity that some current smog alarm circuits reduce smoke alarm by the mode of outside increase discrete device realizes temporary transient mute function, although achieve mute function like this, but add expense and the cost of scheme business, and the condition entering silent mode is very wide, no matter whether there is smog alarm to enter silent mode, user is likely caused only to need to see TEST button alarm condition, but all enter silent mode, aobvious is not very hommization at every turn.
In sum, the smog alarm circuit of known prior art be realize temporary transient mute function there is increase expense and cost and silent mode enter not humane problem, therefore, be necessary the technological means proposing to improve in fact, solve this problem.
Summary of the invention
For overcoming the above-mentioned shortcoming of prior art, fundamental purpose of the present invention is the smog alarm circuit providing a kind of tool mute function, it is by the receiving demodulation module of smog alarm chip internal integrated wireless signal, the functions such as the button making user can realize smoke alarm by telepilot is reported to the police, temporarily quiet and local smog alarm instruction, facilitate the operation of user.
For reaching above-mentioned and other object, the invention provides a kind of smog alarm circuit with mute function, at least comprise smoke signal receiver module, amplifying circuit, smokescope comparator circuit and warning circuit, this smog alarm circuit also comprises:
Threshold concentration selector switch, at least there is two input ends and a control end, this two input end is connected with film mist compare threshold and dense smoke mist compare threshold respectively, and this threshold concentration selector switch carries out to this film mist compare threshold and this dense smoke mist compare threshold the second input end that selection outputs to this smokescope comparator circuit under the control of the control signal of control end; And
Control circuit, its one end is connected to a TEST button, and the other end is connected to the control end of this threshold concentration selector switch, for generation of the selection controlling this film mist compare threshold and this dense smoke mist compare threshold.
Further, this control circuit comprises a rest-set flip-flop, and what this TEST button was connected to this rest-set flip-flop arranges end, and the output terminal of this rest-set flip-flop is connected to this control end.
Further, this control circuit also comprises a Timer module, and this Timer module one end is connected to this TEST button, and the other end is connected to the reset terminal of this rest-set flip-flop.
Further, this control circuit also comprises one and door, and this TEST button and local smog alarm register are connected to two input ends of this and door respectively, should and gate output terminal be connected to the set end of this rest-set flip-flop.
The invention provides a kind of smog alarm circuit with mute function, at least comprise smoke signal receiver module, amplifying circuit, smokescope comparator circuit and warning circuit, this smog alarm circuit also comprises:
Threshold concentration selector switch, at least there is two input ends and a control end, this two input end is connected with film mist compare threshold and dense smoke mist compare threshold respectively, and this threshold concentration selector switch carries out to this film mist compare threshold and this dense smoke mist compare threshold the second input end that selection outputs to this smokescope comparator circuit under the control of the control signal of control end;
Control circuit, its one end is connected to TEST1 button and TEST2 button, and the other end is connected to the control end of this threshold concentration selector switch, for generation of the selection controlling this film mist compare threshold and this dense smoke mist compare threshold;
Voltage detection module, is connected to the internal key that this TEST1 button is corresponding with TEST2 button, detects for the voltage be connected with this TEST2 button this TEST1 button; And
Warning shroud module, is connected between this voltage detection module output terminal and this warning circuit, to determine whether to enter directly shielding chimes of doom pattern according to the testing result of this voltage detection module.
Further, this voltage detection module is 1/2*VDD voltage detection module, and when this TEST2 button 1/2*VDD voltage, this 1/2*VDD voltage detection module output detections result makes this warning shroud module enter the pattern of directly shielding chimes of doom.
Further, this control circuit comprises a rest-set flip-flop and one and door, this rest-set flip-flop output terminal is connected to this control end, this TEST1 button and this TEST2 button are connected to this and one of door input end, local smog alarm register is connected to this and another input end of door, is somebody's turn to do the set end being connected to this rest-set flip-flop with the output terminal of door.
Further, this control circuit also comprises a Timer module, and this Timer module shields module resets end with this TEST1 button, this TEST2 button, this rest-set flip-flop reset terminal and this warning and is all connected.
The invention provides a kind of smog alarm circuit with mute function, at least comprise smoke signal receiver module, amplifying circuit, smokescope comparator circuit and warning circuit, it is characterized in that: this smog alarm circuit also comprises a warning shroud module, this warning shielding module input connects TEST button, and output terminal is connected to this warning circuit.
Further, this smog alarm circuit also comprises a Timer module, and this Timer module shields module resets end with this TEST button and this warning and is connected.
The present invention also provides a kind of smog alarm circuit to realize quiet method, comprises the steps:
Receive smoke signal;
This smoke signal is amplified;
If do not press TEST button, threshold concentration selector switch exports film mist compare threshold to smokescope comparator circuit, and this smokescope comparator circuit compares the smoke signal amplified and this film mist compare threshold; Otherwise this threshold concentration selector switch exports dense smoke mist compare threshold to this smokescope comparator circuit, and this smokescope comparator circuit compares the smoke signal amplified and this dense smoke mist compare threshold; And
Carry out quiet according to comparative result or report to the police.
Compared with prior art, a kind of smog alarm circuit with mute function of the present invention, form rest-set flip-flop control data selector switch by utilizing chip internal integrated circuit and select two comparative threshold voltage or inner directly integrated alarm screened circuit, achieve and press TEST key and enter quiet functional purpose, The invention also achieves simultaneously and only press the mode that TEST key just can enter silent mode when there being local smog alarm, make quiet control convenient, hommization more, the present invention is simultaneously also by direct integrated shielding alarm module, with double T EST by key control silent mode, simple in one-piece construction, while function-stable, make user can according to actual service conditions unrestricted choice silent mode.
Accompanying drawing explanation
Fig. 1 is traditional smog alarm circuit schematic diagram without mute function;
Fig. 2 is the circuit diagram of smog alarm circuit first preferred embodiment of the band mute function of the present invention;
Fig. 3 is the circuit diagram of smog alarm circuit second preferred embodiment of the band mute function of the present invention;
Fig. 4 is the circuit diagram of smog alarm circuit the 3rd preferred embodiment of the band mute function of the present invention;
Fig. 5 is the circuit diagram of smog alarm circuit first preferred embodiment of the band mute function of the present invention;
Fig. 6 is the method step figure that a kind of smog alarm circuit of the present invention realizes the preferred embodiment of quiet method;
No matter Fig. 7 is that the present invention is at the schematic diagram that or not can not enter the work of silent mode modules under local smog alarm state;
Fig. 8 is the present invention only just can enter the work of silent mode modules schematic diagram when local smog alarm.
Embodiment
Below by way of specific instantiation and accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention is also implemented by other different instantiation or is applied, and the every details in this instructions also can based on different viewpoints and application, carries out various modification and change not deviating under spirit of the present invention.
Fig. 2 is the circuit diagram of a kind of smog alarm circuit first preferred embodiment with mute function of the present invention.This preferred embodiment proposes a kind of whether have smog to press smog alarm circuit that TEST key all enters the band mute function of silent mode, as shown in Figure 2, the smog alarm circuit of the band mute function of the present invention at least comprises: smoke signal receiver module 201, amplifying circuit 202 (AMP), smokescope comparator circuit 203 (COMP), warning circuit 204, threshold concentration selector switch 205 and control circuit 206.Wherein, smoke signal receiver module 201 is for receiving smoke signal, it can be any smoke signal receiving trap, for infrared receiving device in present pre-ferred embodiments, received from the infrared ray Ired outside photoelectricity storehouse by photodiode, smokescope is higher, infrared light is stronger, smoke signal exports amplifying circuit 202 to after a low pass shaping circuit filtering high frequency interference, and wherein low pass shaping circuit is same as the prior art, does not repeat them here, amplifying circuit 202 exports the first input end in1 of smokescope comparator circuit 203 to for the optical signal amplification received by smoke signal receiver module 201, and it can be an amplifier, the compare threshold that smokescope comparator circuit 203 inputs for the signal that inputted by its first input end in1 and the second input end in2 compares, and output alarm control signal COMP_output controls warning circuit 204 and reports to the police, warning circuit 204, be connected to the output terminal of smokescope comparator circuit 203, if the compare threshold that the signal that first input end in1 inputs inputs lower than the second input end in2, then alarm control signal drives warning circuit 204 to report to the police, otherwise warning circuit 204 is not reported to the police, threshold concentration selector switch 205, its input end connects two compare thresholds: film mist compare threshold Vref1 and dense smoke mist compare threshold Vref2, wherein dense smoke mist compare threshold Vref2 is less than film mist compare threshold Vref1, specifically, film mist compare threshold Vref1 and dense smoke mist compare threshold Vref2 selects the data selector of 1 (MUX) to output to the second input end in2 of smokescope comparator circuit 203 by 1, that is: if select film mist compare threshold Vref1, the smog of normal concentration exports through amplifying circuit 202 and just can cause warning lower than film mist compare threshold Vref1, if select dense smoke mist compare threshold Vref2, need denseer smog to export through amplifying circuit 202 and just can cause warning lower than dense smoke mist compare threshold Vref2, control circuit 206 one end is connected to TEST button, the other end is then connected to the control end MUX_C of threshold concentration selector switch 205, for controlling the selection of film mist compare threshold Vref1 and dense smoke mist compare threshold Vref2, that is: do not wish that again smoke alarm is reported to the police when user needs initiatively to produce some smog simultaneously, then can pressing TEST key, to make control circuit 206 control control end MUX_C be 1, data selector (MUX) selects dense smoke mist compare threshold Vref2, the smog that user initiatively produces does not reach dense smoke mist compare threshold Vref2 and then can not report to the police, in present pre-ferred embodiments, control circuit 206 comprises a rest-set flip-flop be made up of two rejection gates, what TEST button was connected to rest-set flip-flop arranges end (SET), the output terminal of rest-set flip-flop is connected to control end MUX_C, normal condition rest-set flip-flop is in reset mode, control line MUX_C is 0, data selector (MUX) selects film mist compare threshold Vref1, and do not wish that smoke alarm is reported to the police when user needs initiatively to produce some smog simultaneously, then can press TEST key and make rest-set flip-flop set, control end MUX_C is 1, data selector (MUX) then selects dense smoke mist compare threshold Vref2, the smog that user initiatively produces does not reach dense smoke mist compare threshold Vref2 and then can not report to the police.
Preferably, control circuit 206 also comprises a counter module, its one end is connected to TEST button, the other end is connected to the reset terminal (RESET) of rest-set flip-flop, that is, user presses TEST button reset counter module simultaneously, makes counter start counting, reset when arrival setting-up time hour counter produces reset enable signal rest-set flip-flop, select light smoke density threshold value Vref1 and get back to normal smokescope detected state.
Fig. 3 is the circuit diagram of a kind of smog alarm circuit second preferred embodiment with mute function of the present invention, this preferred embodiment proposes a kind of smog alarm circuit only just entering the band mute function of silent mode when there being local smog alarm by TEST button, control circuit 206 is with the first preferred embodiment difference, in this preferred embodiment, control circuit 206 also comprises one and door, TEST button and local smog alarm register (Local smoke) are connected to two input ends with door respectively, the set end of rest-set flip-flop is connect with gate output terminal, therefore rest-set flip-flop set can not be made when not having smog alarm by TEST button, so do not enter silent mode yet.
Fig. 4 is the circuit diagram of a kind of smog alarm circuit with mute function the 3rd of the present invention preferred embodiment, this preferred embodiment proposes a kind of smog alarm circuit directly entering the band mute function of the silent mode of chimes of doom shielding regardless of smokescope situation, as shown in Figure 4, the smog alarm circuit of the band mute function of the present invention at least comprises: smoke signal receiver module 401, amplifying circuit 402, smokescope comparator circuit 403, warning circuit 404 and warning shroud module 405, wherein the second input termination film mist compare threshold Vref1 of smokescope comparator circuit 403, TEST button is connected to warning shroud module 405 input end, warning shroud module 405 output terminal is connected to warning circuit 404, other parts are identical with the first preferred embodiment, that is, TEST button is directly acted on warning shroud module 405 by this preferred embodiment, then directly chimes of doom is shielded by TEST button when circuit alarm.Preferably, this preferred embodiment can also comprise a counter module, its one end is connected to TEST button, and the other end is connected to the reset terminal (RESET) of warning shroud module 405, cancels shielding and then get back to Normal Alarm state after timer arrives setting-up time.
Fig. 5 is the circuit diagram of a kind of smog alarm circuit with mute function the 4th of the present invention preferred embodiment, this preferred embodiment proposes a kind of silent mode providing two kinds of TEST keystroke pattern to enter respectively to compare with dense smoke mist threshold value Vref2 and the smog alarm circuit directly shielding the band mute function of the silent mode of chimes of doom, it combines the function that the second preferred embodiment and the 3rd preferred embodiment enter silent mode, with the second preferred embodiment unlike, control circuit 501 be connected to outside two buttons with an input end of door: TEST1 button and TEST2 button, TEST1 button is for connecting the first voltage VDD, TEST2 button is for connecting the second voltage 1/2*VDD, inner TEST button connects a voltage detection module 502 simultaneously, voltage detection module 502 essence is 1/2*VDD voltage detection module, voltage detection module 502 connects warning shroud module 503, warning shroud module 503 connects warning circuit and is used for shielding chimes of doom, preferably, control circuit 501 also comprises the rest-set flip-flop that a counter module connects warning shroud module 503 and control circuit 501, TEST button reset counter, counter arrives to reset after setting-up time rest-set flip-flop and warning shroud module 503 and makes circuit Normal Alarm, that is: outside TEST1 presses keyed jointing voltage VDD, the silent mode that then can to enter with dense smoke mist compare threshold Vref2 be compare threshold, outside TEST2 presses keyed jointing voltage 1/2*VDD, the pattern of directly shielding chimes of doom then directly can be entered by 1/2*VDD voltage detection module, like this, the smoke condition that user can produce according to oneself is selected to enter which kind of silent mode flexibly.
Fig. 6 is the method step figure that a kind of smog alarm circuit of the present invention realizes the preferred embodiment of quiet method, as shown in Figure 6, a kind of smog alarm circuit of the present invention realizes quiet method and comprises the steps: that smoke signal receiver module receives smoke signal (step 601); Amplifying circuit amplifies (step 602) the smoke signal received; Whether TEST button is pressed (step 603); If do not press TEST button, threshold concentration selector switch exports film mist compare threshold to smokescope comparator circuit, and this smokescope comparator circuit compares (step 604) the smoke signal amplified and this film mist compare threshold; Otherwise this threshold concentration selector switch exports dense smoke mist compare threshold to this smokescope comparator circuit, and this smokescope comparator circuit compares (step 605) the smoke signal amplified and this dense smoke mist compare threshold; And carry out quiet according to comparative result or report to the police (step 606).
No matter Fig. 7 is that the present invention is at the schematic diagram or not entering the work of silent mode modules under local smog alarm state, for Fig. 2 under normal Smoke Detection pattern, data selector (MUX) control end MUX_C is low level, select film mist alarm threshold value Vref1, because TEST button is directly connected with the Set end of rest-set flip-flop, therefore no matter which kind of state local smog alarm register Local smoke is in, after pressing TEST key, control end MUX_C becomes high level, select dense smoke mist alarm threshold value Vref2, identical smokescope passes through amplifying circuit output voltage higher than Vref2, therefore local smog alarm disappears, enter silent mode, terminate rear generation reseting signal reset rest-set flip-flop when timer, MUX_C is drawn as low level, exits silent mode, and then press TEST button, circuit enters silent mode again, and the external world has film mist still not report to the police.
Fig. 8 is the present invention only just can enter the work of silent mode modules schematic diagram when local smog alarm.For Fig. 3 under normal Smoke Detection pattern, data selector (MUX) control end MUX_C is low level, select film mist alarm threshold value Vref1, outside smokescope creates local smog alarm by amplifying circuit output voltage lower than Vref1 simultaneously, by TEST button when having a local smog alarm, the Set end of rest-set flip-flop has detected high level pulse, data selector (MUX) control end MUX_C is made to become high level, select dense smoke mist alarm threshold value Vref2 simultaneously, identical smokescope passes through amplifying circuit output voltage higher than Vref2, therefore local smog alarm disappears, enter silent mode, terminate rear generation reseting signal reset rest-set flip-flop when timer, control end MUX_C is drawn as low level, exits silent mode, and then press TEST button, owing to not having local smog, the Set end of rest-set flip-flop does not produce high level, therefore can not enter silent mode.
Visible, a kind of smog alarm circuit with mute function of the present invention, achieves and enters quiet function by pressing TEST key, realize quiet, saved cost relative to traditional smog alarm circuit by peripheral discrete device.The invention allows for a kind of TEST key of only pressing when there being local smog alarm simultaneously and just can enter silent mode, make that control is convenient, hommization more, the invention also proposes by direct integrated shielding alarm module, with double T EST by key control silent mode, user can according to actual service conditions unrestricted choice silent mode.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all without prejudice under spirit of the present invention and category, can carry out modifying to above-described embodiment and change.Therefore, the scope of the present invention, should listed by claims.
Claims (6)
1. the smog alarm circuit with mute function, at least comprise smoke signal receiver module, amplifying circuit, smokescope comparator circuit and warning circuit, it is characterized in that, this smog alarm circuit also comprises:
Threshold concentration selector switch, at least there is two input ends and a control end, this two input end is connected with film mist compare threshold and dense smoke mist compare threshold respectively, and this threshold concentration selector switch carries out to this film mist compare threshold and this dense smoke mist compare threshold the second input end that selection outputs to this smokescope comparator circuit under the control of the control signal of control end; And
Control circuit, its one end is connected to a TEST button, and the other end is connected to the control end of this threshold concentration selector switch, for generation of the selection controlling this film mist compare threshold and this dense smoke mist compare threshold;
This control circuit also comprises one and door, and this TEST button and local smog alarm register are connected to two input ends of this and door respectively, should and gate output terminal be connected to one end of control circuit.
2. the smog alarm circuit of band mute function as claimed in claim 1, is characterized in that: this control circuit comprises a rest-set flip-flop, and what this TEST button was connected to this rest-set flip-flop arranges end, and the output terminal of this rest-set flip-flop is connected to this control end.
3. the smog alarm circuit of band mute function as claimed in claim 2, it is characterized in that: this control circuit also comprises a Timer module, this Timer module one end is connected to this TEST button, and the other end is connected to the reset terminal of this rest-set flip-flop.
4. the smog alarm circuit with mute function, at least comprise smoke signal receiver module, amplifying circuit, smokescope comparator circuit and warning circuit, it is characterized in that, this smog alarm circuit also comprises:
Threshold concentration selector switch, at least there is two input ends and a control end, this two input end is connected with film mist compare threshold and dense smoke mist compare threshold respectively, and this threshold concentration selector switch carries out to this film mist compare threshold and this dense smoke mist compare threshold the second input end that selection outputs to this smokescope comparator circuit under the control of the control signal of control end;
Control circuit, its one end is connected to TEST1 button and TEST2 button, and the other end is connected to the control end of this threshold concentration selector switch, for generation of the selection controlling this film mist compare threshold and this dense smoke mist compare threshold;
Voltage detection module, is connected to the internal key that this TEST1 button is corresponding with TEST2 button, detects for the voltage be connected with this TEST2 button this TEST1 button; And
Warning shroud module, is connected between this voltage detection module output terminal and this warning circuit, to determine whether to enter directly shielding chimes of doom pattern according to the testing result of this voltage detection module;
This control circuit comprises a rest-set flip-flop and one and door, this rest-set flip-flop output terminal is connected to this control end, this TEST1 button and this TEST2 button are connected to this and one of door input end, local smog alarm register is connected to this and another input end of door, is somebody's turn to do the set end being connected to this rest-set flip-flop with the output terminal of door; This control circuit also comprises a Timer module, and this Timer module shields module resets end with this TEST1 button, this TEST2 button, this rest-set flip-flop reset terminal and this warning and is all connected.
5. the smog alarm circuit of band mute function as claimed in claim 4, it is characterized in that: this voltage detection module is 1/2*VDD voltage detection module, when this TEST2 button 1/2*VDD voltage, this 1/2*VDD voltage detection module output detections result makes this warning shroud module enter the pattern of directly shielding chimes of doom.
6. realize a quiet method based on the smog alarm circuit described in claim 1 or 4, it is characterized in that, described method comprises the steps:
Receive smoke signal;
This smoke signal is amplified;
If do not press TEST button, threshold concentration selector switch exports film mist compare threshold to smokescope comparator circuit, and this smokescope comparator circuit compares the smoke signal amplified and this film mist compare threshold; Otherwise this threshold concentration selector switch exports dense smoke mist compare threshold to this smokescope comparator circuit, and this smokescope comparator circuit compares the smoke signal amplified and this dense smoke mist compare threshold; And
Carry out quiet according to comparative result or report to the police.
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| CN201110339506.1A CN103093573B (en) | 2011-10-31 | 2011-10-31 | The smog alarm circuit of tool mute function and quiet implementation method thereof |
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| CN201110339506.1A CN103093573B (en) | 2011-10-31 | 2011-10-31 | The smog alarm circuit of tool mute function and quiet implementation method thereof |
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| CN103093573B true CN103093573B (en) | 2015-09-02 |
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| US6346880B1 (en) * | 1999-12-20 | 2002-02-12 | Motorola, Inc. | Circuit and method for controlling an alarm |
| CN101120389A (en) * | 2005-02-18 | 2008-02-06 | 洛卡科技有限公司 | Wireless remote controllable fire and smoke alarm system |
| CN201449650U (en) * | 2009-05-27 | 2010-05-05 | 无锡奥利杰科技有限公司 | Low-voltage smoke detector chip with loudspeaker drive |
| CN202331707U (en) * | 2011-10-31 | 2012-07-11 | 无锡华润矽科微电子有限公司 | Smog alarm circuit with mute function |
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2011
- 2011-10-31 CN CN201110339506.1A patent/CN103093573B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6346880B1 (en) * | 1999-12-20 | 2002-02-12 | Motorola, Inc. | Circuit and method for controlling an alarm |
| CN101120389A (en) * | 2005-02-18 | 2008-02-06 | 洛卡科技有限公司 | Wireless remote controllable fire and smoke alarm system |
| CN201449650U (en) * | 2009-05-27 | 2010-05-05 | 无锡奥利杰科技有限公司 | Low-voltage smoke detector chip with loudspeaker drive |
| CN202331707U (en) * | 2011-10-31 | 2012-07-11 | 无锡华润矽科微电子有限公司 | Smog alarm circuit with mute function |
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