CN114340085B - Photoelectric smoke sensor driving circuit and driving method thereof - Google Patents
Photoelectric smoke sensor driving circuit and driving method thereof Download PDFInfo
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- CN114340085B CN114340085B CN202210234700.1A CN202210234700A CN114340085B CN 114340085 B CN114340085 B CN 114340085B CN 202210234700 A CN202210234700 A CN 202210234700A CN 114340085 B CN114340085 B CN 114340085B
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Abstract
A photoelectric smoke sensor driving circuit and a driving method thereof are used for driving a first light emitting diode and comprise a state machine, a charge generation detection unit, an energy storage voltage reduction feedback unit and a first driving unit; the state machine controls the output multiple of the charge generation detection unit, controls the first driving current of the first driving unit, controls the charge generation detection unit to raise the low voltage of a power supply to the voltage required by the energy storage voltage reduction feedback unit, can realize no extra power consumption of an output capacitor, provides enough voltage and current for the first light emitting diode by using the charge generation detection unit and the energy storage voltage reduction feedback unit as a boosting scheme, and periodically measures the voltage value fed back by the energy storage voltage reduction feedback unit to determine the duration of the boosted voltage, compensates the capacity loss of the capacitor in the long-term working process, and improves the working time of the smoke sensor.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a photoelectric smoke sensor driving circuit and a driving method thereof.
Background
The smoke alarm device is widely applied to places with fire prevention requirements, such as buildings, workshops, public transportation, hotels, restaurants and the like. In the smoke alarm device, the photoelectric smoke sensor is used most widely and is used most flexibly.
The photoelectric smoke sensor judges whether a fire phenomenon occurs or not by measuring the light quantity of the light emitting diodes after passing through smoke, the types of the smoke generated by different fire substances are different, and meanwhile, the scattering capacities of different kinds of the smoke to different wavelengths of light are also different, so that the photoelectric smoke sensor is required to be provided with a plurality of light emitting diodes, the wavelengths emitted by the light emitting diodes are different, the detection capacity to different kinds of smoke is improved, and at present, two light emitting diodes with larger wavelength span are commonly used as light emitting sources for detection.
Because the driving voltage and current of the light emitting diodes with partial wavelengths are large, in order to ensure the normal work of the light emitting diodes, an additional inductance boost type boosting power supply circuit is added to the smoke alarm device to drive the light emitting diodes, and the increase of the whole power consumption of the smoke alarm device is inevitably caused. The smoke alarm device is generally powered by a battery, the working time is shortened, and how to effectively drive the light emitting diode is a research subject of the smoke alarm device.
As shown in fig. 1, a conventional led driving circuit 100 drives an led by using an inductor boost type boosting power supply circuit. Which comprises the following steps: a boost circuit 102, a driver circuit 104, a logic controller 106, a battery 108, and a light emitting diode 110. The light emitting diode 110 is connected to a constant reference power VCC. The booster circuit 102 is used for boosting the voltage of the battery 108 for the operation of the light emitting diode 110; the driving circuit 104 is used for controlling the driving current of the light emitting diode 110 and controlling the on and off of the light emitting diode 110; the logic controller 106 is used to control the driving circuit 104. The boost circuit 102 requires an inductor L and a first feedback resistor R for operationupAnd a second feedback resistor RdownAn output capacitor Cbulk。
When the light emitting diode 110 is working, the boost circuit is turned on, and the logic controller 106 controls the driving circuit 104 to light the light emitting diode 110, in the process, the boost output capacitor C is providedbulkAnd charging is carried out. When the light emitting diode 110 does not work, the voltage boost circuit 102 is turned off, and the logic controller 106 controls the driving circuit 104 to turn off the light emitting diode 110, in the process, CbulkThe electric energy on the capacitor passes through a first feedback resistor R upAnd a second feedback resistor RdownPerforming a bleed-off, when the boost circuit 102 is turned on next time, CbulkThe power on will be consumed.
The traditional photoelectric smoke sensor adopts a 3.0V battery for power supply, and an inductive boost power supply circuit is generally adopted for driving a light-emitting diode which needs high voltage and large current. The inductance boost type booster circuit has static power consumption of self working, which can increase the power consumption and shorten the working time of the smoke sensor. In order to reduce power consumption, at present, when a plurality of light emitting diodes are driven, time-sharing driving is adopted, an inductance boost type booster circuit is turned off when the circuit is idle, due to the fact that extra feedback resistors exist, electric energy on a boost output capacitor is excessively discharged, when the light emitting diodes are required to be started, boosting is turned on again, the extra electric energy is consumed when the boost output capacitor is charged besides the electric energy consumed by the light emitting diodes, power consumption is further increased, and the working time of the smoke sensor is shortened.
In view of the conventional photoelectric smoke sensor, the light emitting diode of the conventional photoelectric smoke sensor is driven by an inductive boost type boosting power supply, which has the defects of static power consumption, large power consumption, short working time and the like due to the problem that the output capacitor consumes electric energy. Therefore, the invention provides a photoelectric smoke sensor driving circuit and a driving method thereof, which aim to reduce power consumption and increase working time, and simultaneously solve the problem of service life reduction of a capacitor in a long-term working process by adding a voltage feedback mechanism.
Disclosure of Invention
Embodiments of the present invention provide a driving circuit and a driving method for a photoelectric smoke sensor, which can solve the problems of consuming extra power, shortening the working time of the smoke sensor, and reducing the lifetime of a capacitor in a long-term working process.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
the embodiment of the invention provides a photoelectric smoke sensor driving circuit which is used for driving a first light emitting diode and is characterized by comprising a state machine, a charge generation detection unit, an energy storage voltage reduction feedback unit and a first driving unit; a charge generation detection unit, a first end of which is connected with the state machine; a first end of the energy storage voltage reduction feedback unit is connected with a second end of the charge generation detection unit, a second end of the energy storage voltage reduction feedback unit is connected with an anode of the first light emitting diode, and a third end of the energy storage voltage reduction feedback unit is connected with a cathode of the first light emitting diode; a first end of the first driving unit is connected with a second end of the state machine, and a second end of the first driving unit is connected with a fourth end of the energy storage step-down feedback unit; the power supply is connected with the charge generation detection unit, the power supply provides a first voltage for the charge generation detection unit, the state machine controls an output second voltage of the charge generation detection unit and controls a first driving current of the first driving unit, the second voltage is a multiple of the first voltage, the charge generation detection unit is used for raising the first voltage of the power supply to the second voltage required by the energy storage voltage reduction feedback unit, the first voltage is a low voltage, the second voltage is a high voltage, and meanwhile the state machine controls the charge generation detection unit to periodically measure the feedback voltage of the energy storage voltage reduction feedback unit.
Preferably, the energy storage buck feedback unit includes a first diode, a first resistor, a second diode, a second resistor, a first zener diode, a first capacitor, a first NMOS transistor, and a second capacitor, one end of the first diode is connected to the charge generation detection unit and one end of the second diode, the other end of the first diode is connected to one end of the first resistor, the other end of the second diode is connected to one end of the second resistor and one end of the first zener diode, the other end of the first resistor is connected to the other end of the second resistor and one end of the first capacitor, and is connected to the anode of the first light emitting diode, the other end of the first zener diode is grounded to the other end of the first capacitor, the drain of the first NMOS transistor is connected to the cathode of the first light emitting diode, the grid electrode of the first NMOS tube is connected with the power supply, the source electrode of the first NMOS tube is connected with one end of the second capacitor and the first driving unit, and the other end of the second capacitor is grounded.
The embodiment of the invention provides a driving method of a photoelectric smoke sensor, which is characterized by comprising the following steps of: (a) during the period that the first light emitting diode is closed, controlling the charge generation detection unit to start a charge generation detection unit to work for a time, and charging the energy storage voltage reduction feedback unit by a first voltage for a charging time; (b) after the charging time is judged to be met, controlling the charge generation detection unit to be closed; (c) measuring the feedback voltage of the energy storage voltage reduction feedback unit by the charge generation detection unit; (d) the state machine judges whether the feedback voltage is greater than a threshold voltage, and the feedback voltage is greater than the threshold voltage (e) to control a first driving unit to control the first light-emitting diode to be started; and, (f) controlling the first driving unit to be turned off. Preferably, after the step (d) of determining whether the feedback voltage is greater than the threshold voltage and the feedback voltage is less than the threshold voltage, the method further comprises the following steps: (d1) when the state machine judges that the feedback voltage is smaller than the threshold voltage, controlling the charge generation detection unit to start for an increase time; and (d2) controlling the charge generation detecting unit to be turned off for a first predetermined time. After step (d2), go to step (c).
Preferably, the first voltage is not less than three times the power supply voltage.
Preferably, after step (f), further comprising: (g) stopping for a second preset time; and the number of the first and second groups,
and (c) returning to the step (a).
Preferably, the step (e) further includes controlling the second driving unit to control the second light emitting diode to be turned on.
Preferably, the step (f) further comprises controlling the second driving unit to be turned off.
In summary, according to the driving circuit and the driving method of the photoelectric smoke sensor of the present invention, the detection accuracy is improved by using the light emitting diodes with different wavelengths to detect different smoke, but the current light emitting diode driving uses an inductance boost type boost power supply, which has the problems of static power consumption, power consumption of an output capacitor, and capacity loss of the capacitor during long-term operation.
The specific techniques employed in the present invention will be further illustrated by the following examples and accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of a conventional led driving circuit.
Fig. 2 is a schematic diagram of the driving circuit of the photoelectric smoke sensor of the present invention.
Fig. 3 is a schematic structural diagram of the energy storage buck feedback unit according to the present invention.
Fig. 4 is a schematic structural diagram of a driving circuit of a two-color photoelectric smoke sensor according to another embodiment of the present invention.
FIG. 5 is a timing diagram of the software operation of the two-color photoelectric smoke sensor driving circuit of the present invention.
Fig. 6 is a flow chart of a driving method of the photoelectric smoke sensor of the invention.
Description of the main component symbols:
100 a light emitting diode driving circuit;
102 a booster circuit;
104 a drive circuit;
106 a logic controller;
108 batteries;
110 light emitting diodes;
200 a photoelectric smoke sensor drive circuit;
204 a first drive unit;
2042 a second drive unit;
206 a state machine;
207 a power supply;
208 a charge generation detection unit;
209 an energy storage buck feedback unit;
210 a first light emitting diode;
212 a second light emitting diode;
300 a two-color photoelectric smoke sensor driving circuit;
C1a first capacitor;
C2a second capacitor;
Cbulkan output capacitor;
CTR1 first control pin;
CTR2 second control pin;
a D1 first diode;
a second diode D2;
e, electric energy;
I1A first drive current;
I2a second drive current;
an L-inductor;
M1an NMOS tube;
R1a first resistor;
R2a second resistor;
Rupa first feedback resistor;
Rdowna second feedback resistor;
S1a first control signal;
S2a second control signal;
TCcontrolling the time;
TZincreasing the time;
Z1a first zener diode;
VDD, VCC supply voltage;
s610 to S690.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "a" means not only "only one of this but also a case of" more than one ".
For a fuller understanding of the objects, features and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:
fig. 2 is a schematic diagram of the driving circuit of the photoelectric smoke sensor of the present invention.
As shown in fig. 2, the driving circuit 200 of the photoelectric smoke sensor includes a first driving unit 204, a state machine 206, a charge generation detecting unit 208, an energy storage buck feedback unit 209, and a first light emitting diode 210. A first terminal of the charge generation detection unit 208 is connected to the state machine 206. A first end of the energy storage step-down feedback unit 209 is connected to a second end of the charge generation detection unit 208, a second end of the energy storage step-down feedback unit 209 is connected to an anode of the first light emitting diode 210, and a third end of the energy storage step-down feedback unit 209 is connected to a cathode of the first light emitting diode 210. The energy storage buck feedback unit 209 is used to store the electric energy E from the charge generation detection unit 208 during the turn-off period of the first light emitting diode 210, so that the first light emitting diode 210 has enough electric energy E to supply during the operation period. When the charge generation detecting unit 208 is not turned on, the energy storage step-down feedback unit 209 feeds back the voltage represented by the electric energy E to the charge generation detecting unit 208. When the feedback voltage is less than the threshold voltage, the charge generation detection unit 208 is turned on for an increasing time, and then the charge generation detection unit 208 is turned off. When the feedback voltage is greater than the threshold voltage, the first driving unit 204 is controlled to turn on the first light emitting diode 210. A first terminal of the first driving unit 204 is connected to a second terminal of the state machine 206. The fourth end of the energy storage buck feedback unit 209 is connected to the second end of the first driving unit 204.
When the first light emitting diode 210 operates, the energy storage step-down feedback unit 209 protects the input voltage of the first driving unit 204 from exceeding the limit of normal operation. Since the voltage across the energy storage buck feedback unit 209 is high, it generally exceeds the input voltage of the first driving unit 204. When the first light emitting diode 210 operates, the voltage drop generated on the first light emitting diode 210 is small, and the voltage drop between the charging voltage of the energy storage step-down feedback unit 209 and the input voltage of the first driving unit 204 is applied to the NMOS of the energy storage step-down feedback unit 202.
The power supply 207 provides a first voltage to the charge generation detection unit 208, and the state machine 206 controls the charge generation detection unit 208 to output a second voltage and controls a first driving current I of the first driving unit 2041The second voltage is a multiple of the first voltage. Power supply 207 is a constant reference power supply.
The charge generation detection unit 208 is used to raise the first voltage of the power supply 207 to a second voltage required by the energy storage buck feedback unit 209. The first voltage is a low voltage and the second voltage is a high voltage. Meanwhile, the state machine 206 controls the charge generation detection unit 208 to periodically measure the feedback voltage of the energy storage buck feedback unit 209.
Fig. 3 is a schematic structural diagram of the energy storage buck feedback unit according to the present invention.
As shown in fig. 3, the energy storage buck feedback unit 209 comprises a first resistor R1A first capacitor C1A first diode D1A first voltage regulator diode Z1A first NMOS transistor M1A second diode D2A second resistor R2A second capacitor C2. First diode D1One terminal thereof is connected to the charge generation detecting unit 208 and a second diode D2One end of which is connected. First diode D1The other terminal and the first resistor R1One end of which is connected. Second diode D2The other terminal and a second resistor R2One terminal of the first Zener diode Z is connected with1One end of which is connected. A first resistor R1The other terminal and a second resistor R2The other terminal of the first capacitor is connected to the first capacitor C1One terminal of which is connected to the anode of the first light emitting diode 210. First zener diode Z1The other terminal and the first capacitor C1The other end of which is connected to ground.
First NMOS transistor M1Is connected to the cathode of the first light emitting diode 210, and the first NMOS transistor M1Is connected to a power supply 207. First NMOS transistor M1Source electrode of and the second capacitor C2One end of which is connected to the first driving unit 204. Second capacitor C2The other end is grounded.
A first resistor R1Is a current limiting resistor for adjusting the first capacitor C 1The time of charging. A first capacitor C1For the energy storage capacitor, when the first light emitting diode 210 does not work, the charge generation detection unit 208 outputs a constant reference power voltage not less than three times as the charging voltage to the first capacitor C1And charging is carried out.
The second resistor R2, the first voltage-stabilizing diode Z1 and the second diode D2 form a voltage feedback circuit. After the charging is finished, a voltage feedback circuit consisting of a second resistor R2, a first voltage stabilizing diode Z1 and a second diode D2 is used for connecting a first capacitor C1The voltage is fed back to the charge generation detection unit 208 for determination. If the feedback voltage exceeds the threshold voltage, no additional charge time is added. If the feedback voltage is less than the threshold voltage, the charge generation detection unit 208 will be turned on again for the first capacitor C1Charging is performed for an incremental time.
When the first light emitting diode 210 is turned on, the charge generation detection unit 208 is turned off, and the first capacitor C1The electric energy E is discharged to the first light emitting diode 210 to operate. A first capacitor C1The selection of the first light emitting diode 210 and the setting of the operation time of the charge generation detection unit 208 are required to satisfy the energy consumption during the intermittent operation of the first light emitting diode 210, and the first light emitting diode is not completely discharged.
First NMOS transistor M1And a second capacitor C2A voltage step-down circuit is constructed. Second capacitor C2The filtering function is performed to reduce the ripple of the driving voltage of the first light emitting diode 210. First NMOS transistor M1Taking on the voltage drop between the voltage across the energy storage buck feedback unit 209 and the input voltage of the first drive unit 204. The constant reference power supply VDD is the power supply 207 voltage, is directly connected with the power supply 207, and is a first NMOS transistor M1Providing operating biasAnd ensures that the input voltage of the first driving unit 204 does not exceed the voltage of the power supply 207. First NMOS transistor M1The device with the low bias voltage is selected to ensure that the power supply 207 will still operate properly when the voltage is reduced.
The first driving unit 204 is used for providing a first driving current I of the first light emitting diode 210 when the first light emitting diode 210 is operated1. Which is controlled by the state machine 206 to control the first driving current I of the first led 2101And the working time of the light emitting diode.
Fig. 4 is a schematic structural diagram of a driving circuit of a two-color photoelectric smoke sensor according to another embodiment of the present invention.
As shown in fig. 4, the driving circuit 300 of the two-color photoelectric smoke sensor according to another embodiment of the present invention is based on the driving circuit 200 of the photoelectric smoke sensor, and further includes a second driving unit 2042 and a second light emitting diode 212. The dual color photoelectric smoke sensor driving circuit 300 drives the light emitting diodes of different wavelengths, the first light emitting diode 210 and the second light emitting diode 212. The first driving voltage of the first light emitting diode 210 is higher than the second driving voltage of the second light emitting diode 212.
The first led 210 provides a charging voltage from the charge generation detection unit 208 to the energy storage buck feedback unit 209. The charging voltage is not less than three times of the constant reference power supply voltage. The energy storage buck feedback unit 209 further drives the first light emitting diode 210 to operate. The first driving unit 204 provides a first driving current I for the first light emitting diode 2101。
The second driving voltage of the second led 212 is lower than the first driving voltage, and therefore, the second driving voltage can be directly provided by the power voltage VDD.
The second driving unit 2042 provides a second driving current I for the second led 2122. A first end of the second driving unit 2042 is connected to the state machine 206, and a second end of the second driving unit 2042 is connected to a cathode of the second led 212. The anode of the second light emitting diode 212 is connected to a constant power voltage VDD.
The first control pin CTR1 is connected to the state machine 206. First control tubeThe pin CTR1 provides a first control signal S1For controlling the activation/deactivation of the charge generation detection unit 208. By applying a first control signal S1To activate the charge generation detection unit 208.
The second control pin CTR2 is connected to the state machine 206. The second control pin CTR2 is used for controlling the first led 210 and the second led 212 to turn on/off, and the second control pin CTR2 is used for controlling the first led 210 and the second led 212 to turn on/off according to a second control signal S 2To activate/deactivate the first driving unit 204 and the second driving unit 2042. The selection of the first driving unit 204 and the second driving unit 2042 is determined by the configuration command of the state machine 206.
FIG. 5 is a timing diagram of the software operation of the two-color photoelectric smoke sensor driving circuit of the present invention.
As shown in fig. 5, when the first control pin CTR1 has no signal, the charge generation detection unit 208 is in a non-activated state, and the second light emitting diode 212 is first turned on through the second control pin CTR 2. The first control pin CTR1 gives the state machine 206 a control time T before the first LED 210 is litCFirst control signal S1. It should be noted that the control time T referred to in the present inventionCAround 4 milliseconds.
The charge generation detection unit 208 is turned on to charge the energy storage buck feedback unit 209. After the charging is finished, the first control signal S is closed1The charging of the energy storage buck feedback unit 209 is stopped, and the charge generation detection unit 208 measures the voltage value fed back by the energy storage buck feedback unit 209, and if the voltage value is smaller than the threshold voltage, the first control pin CTR1 will give the state machine 206 a certain time TzThe charge generation detection unit 208 is turned on to continue charging the energy storage step-down feedback unit 209, and after the increased charging time is over, the first control signal S is turned off 1And then the first light emitting diode 210 is lit through the second control pin CTR 2.
In the idle state, the first light emitting diode 210 does not consume any power. The above process is performed every idle period. It should be noted that the idle time in the embodiment of the present invention is about 10 seconds. The second led 212 may be lit after the first led 210 is lit, or may be between the charge generation detection unit 208 being turned on and the first led 210 being lit.
Fig. 6 is a flow chart of a driving method of the photoelectric smoke sensor according to the present invention.
As shown in fig. 2 and 6, the photoelectric smoke sensor driving method is applied to a photoelectric smoke sensor driving circuit 200. In step S610, during the period when the first light emitting diode 210 is turned off, the state machine 206 controls the charge generation detection unit 208 to turn on a charge generation detection unit for an operating time, so as to charge the energy storage buck feedback unit 209 with the first voltage for a charging time. The first voltage is not less than three times the power supply voltage. The energy storage step-down feedback unit 209 is charged with a constant reference power supply voltage not less than three times as the charging voltage.
In step S620, the state machine 206 controls the charge generation detection unit 208 to turn off for a first predetermined time after the charging time meets the charging voltage requirement. It should be noted that the first predetermined time in the process is not too long, and the power consumption is increased due to the too long time.
In step S630, the charge generation detection unit 208 measures the feedback voltage of the energy storage step-down feedback unit 209.
In step S640, the state machine 206 determines whether the feedback voltage is greater than the threshold voltage, and the feedback voltage is greater than the threshold voltage.
In step S650, the state machine 206 controls the first driving unit 204 to control the first light emitting diode 210 to turn on step S660 when the first light emitting diode 210 is on for a certain time. The state machine 206 controls the first driving unit 204 to be turned off.
In step S640, after determining whether the feedback voltage is greater than the threshold voltage and the feedback voltage is less than the threshold voltage, the method further includes the following steps: in step S680, when the state machine 206 determines that the feedback voltage is smaller than the threshold voltage, the charge generation detection unit 208 is controlled to be turned on for an increasing time. Then to step S690, the state machine 206 controls the charge generation detecting unit 208 to turn off for a first predetermined time. After step S690, the process returns to step S630 again to continue.
After step S640, the method further includes step S660 stopping the interval for a second predetermined time; and, go back to step S610.
As shown in fig. 4 and 6, the step S630 further includes the state machine 206 controlling the second driving unit 2042 to control the second light emitting diode 212 to be turned on.
Step S640 further includes the state machine 206 controlling the second driving unit 2042 to turn off.
By applying the photoelectric smoke sensor driving circuit and the driving method thereof provided by the embodiment of the application, at least the following beneficial effects can be realized:
1. the comprehensive conversion efficiency is high. The charge generation detection unit 208 and the energy storage voltage reduction feedback unit 209 are adopted as a boosting scheme to provide enough voltage and current for the light emitting diode, no additional inductance boosting type boosting power circuit is provided, no additional static power consumption is generated, the comprehensive conversion efficiency can reach about 96%, and the working time of the photoelectric smoke sensor is prolonged;
2. the output capacitor has no extra power consumption. According to the scheme, a plurality of light emitting diodes are driven in a time-sharing mode, when the light emitting diodes do not work, the output of the energy storage voltage reduction feedback unit 209 has no electric energy consumption, the output capacitor can keep long-time electric energy, the output capacitor of the inductance voltage boosting type boosting power supply circuit always has extra electric energy consumption due to voltage feedback, the electric energy is basically consumed when the light emitting diodes are started next time, and the extra electric energy is consumed when the boosting is started again and the output capacitor is charged; the output capacitor has no extra electric energy consumption, so that the working time of the smoke sensor is further prolonged;
3. And the capacity loss of the energy storage capacitor in long-term operation is compensated. The voltage on the energy storage capacitor is fed back to the charge generation detection unit 208, and whether extra charging time is added or not is determined by judging the relation between the feedback voltage and the threshold voltage so as to ensure that the energy on the energy storage capacitor is enough for the first light emitting diode 210 to work;
4. the cost is low. The light-emitting diode driving scheme is low in cost due to the fact that the universal sheet resistor, the sheet capacitor, the electrolytic capacitor, the field effect transistor, the voltage stabilizing diode and the diode are adopted;
5. the integration level is high, and the occupied area is small. The light emitting diode driving scheme has the advantages of few devices, simple structure, higher integration level and small occupied board area compared with a complex inductance boosting type boosting power supply circuit.
Based on the same inventive concept, the embodiment of the application provides a photoelectric smoke sensor, which comprises the driving circuit and the driving method of the photoelectric smoke sensor provided by the embodiment of the application.
The driving circuit and the driving method of the photoelectric smoke sensor provided by the embodiment of the application have the same inventive concept and the same beneficial effects as the embodiments described above, and the contents not shown in detail in the driving circuit and the driving method of the photoelectric smoke sensor can refer to the embodiments described above and are not described again here.
Those of skill in the art will understand that various operations, methods, steps in the flow, measures, schemes discussed in this application can be alternated, modified, combined, or deleted. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Although the present invention has been described with reference to particular embodiments, it will be understood by those skilled in the art that various changes in form, construction, features, methods and quantities may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A photoelectric smoke sensor driving circuit for driving a first light emitting diode includes
A state machine;
a charge generation detection unit, a first end of which is connected with the state machine;
a first end of the energy storage voltage reduction feedback unit is connected with a second end of the charge generation detection unit, a second end of the energy storage voltage reduction feedback unit is connected with an anode of the first light emitting diode, and a third end of the energy storage voltage reduction feedback unit is connected with a cathode of the first light emitting diode; the energy storage buck feedback unit comprises a first diode, a first resistor, a second diode, a second resistor, a first voltage stabilizing diode, a first capacitor, a first NMOS tube and a second capacitor, wherein one end of the first diode is connected with the charge generation detection unit and one end of the second diode, the other end of the first diode is connected with one end of the first resistor, the other end of the second diode is connected with one end of the second resistor and one end of the first voltage stabilizing diode, the other end of the first resistor is connected with the other end of the second resistor and one end of the first capacitor, and is simultaneously connected with the anode of the first light emitting diode, the other end of the first voltage stabilizing diode is grounded with the other end of the first capacitor, the drain electrode of the first NMOS tube is connected with the cathode of the first light emitting diode, the grid electrode of the first NMOS tube is connected with a power supply, the source electrode of the first NMOS tube is connected with one end of the second capacitor and the first driving unit, and the other end of the second capacitor is grounded;
A first end of the first driving unit is connected with a second end of the state machine, and a second end of the first driving unit is connected with a fourth end of the energy storage step-down feedback unit;
the power supply is connected with the charge generation detection unit, the power supply provides a first voltage for the charge generation detection unit, the state machine controls an output second voltage of the charge generation detection unit and controls a first driving current of the first driving unit, the second voltage is a multiple of the first voltage, the charge generation detection unit is used for raising the first voltage of the power supply to the second voltage required by the energy storage voltage reduction feedback unit, the first voltage is a low voltage, the second voltage is a high voltage, and meanwhile the state machine controls the charge generation detection unit to periodically measure the feedback voltage of the energy storage voltage reduction feedback unit.
2. The optoelectronic smoke sensor driving circuit as defined in claim 1, further comprising:
a second light emitting diode; and the number of the first and second groups,
a first end of the second driving unit is connected with a second end of the state machine, and a second end of the second driving unit is connected with a cathode of the second light emitting diode;
The state machine controls a second driving current of the second driving unit, and the photoelectric smoke sensor driving circuit drives the second light emitting diode.
3. An optoelectronic smoke sensor driving method applied to the optoelectronic smoke sensor driving circuit as claimed in any one of claims 1 to 2, wherein the optoelectronic smoke sensor driving method comprises the state machine executing the following steps:
(a) during the period that the first light emitting diode is closed, controlling the charge generation detection unit to start a charge generation detection unit to work for a time, and charging the energy storage voltage reduction feedback unit by a first voltage for a charging time;
(b) after the charging time is judged to be met, controlling the charge generation detection unit to be closed;
(c) measuring the feedback voltage of the energy storage voltage reduction feedback unit by the charge generation detection unit;
(d) the state machine judges whether the feedback voltage is greater than a threshold voltage or not, and the feedback voltage is greater than the threshold voltage;
(e) controlling a first driving unit to control the first light emitting diode to be started; and the number of the first and second groups,
(f) and controlling the first driving unit to be closed.
4. The method of claim 3, wherein after determining whether the feedback voltage is greater than the threshold voltage and less than the threshold voltage in step (d), further comprising the steps of:
(d1) When the state machine judges that the feedback voltage is smaller than the threshold voltage, controlling the charge generation detection unit to start for an increase time;
(d2) controlling the charge generation detection unit to be closed for a first preset time; and the number of the first and second groups,
after step (d2), go to step (c).
5. The photoelectric smoke sensor driving method according to claim 3, wherein the first voltage is not less than three times a power supply voltage.
6. The method of claim 3, further comprising, after step (f):
(g) stopping for a second predetermined time; and the number of the first and second groups,
and (c) returning to the step (a).
7. The method of claim 3, wherein step (e) further comprises controlling the second driving unit to turn on the second light emitting diode.
8. The method of claim 3, wherein step (f) further comprises turning off the second driving unit.
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