CN209327524U - A kind of PWM output interference influences verifying circuit to PIR human body sensing - Google Patents
A kind of PWM output interference influences verifying circuit to PIR human body sensing Download PDFInfo
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- CN209327524U CN209327524U CN201822132288.4U CN201822132288U CN209327524U CN 209327524 U CN209327524 U CN 209327524U CN 201822132288 U CN201822132288 U CN 201822132288U CN 209327524 U CN209327524 U CN 209327524U
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Abstract
The utility model relates to a kind of PWM output interference to influence verifying circuit to PIR human body sensing, comprising: be used to form the signal generating circuit of pwm signal, the signal generating circuit communication connection has to receive pwm signal and export the PIR data processing circuit of PIR data processing signal, power supply circuit, the power supply circuit is coupled to the PIR data processing circuit to be powered to the PIR data processing circuit, and the PIR data processing circuit, which is coupled with, examines the PIR data processing signal of the PIR data processing circuit output to have oscillograph without exception.The utility model tool generates pwm signal, and on PIR data processing signal, whether there is or not influences by oscilloscope test pwm signal, to reduce the effect of the interference of pwm signal comparison PIR data processing circuit.
Description
Technical field
The utility model relates to the technical fields of human body sensing, more particularly, to a kind of PWM output interference to PIR human body sense
It should influence to verify circuit.
Background technique
With the development of science and technology, more and more furniture are using intelligent, the especially development of intelligent lamp.Existing intelligent lamp
By the acoustic control of simple switch control or light-operated, realizes dark or light coloring bright to the light of LED etc. to existing and carry out intelligence
It is adjustable.
The Chinese patent of Publication No. CN10504879 discloses a kind of wardrobe uninterrupted power supply human body infrared induction at present
Dimming LED lamp.Including light-emitting diode (LED) lamp, AC power source rectifier, battery, voltage stabilizing chip, infrared sensor, put out
Lamp delay circuit, relay J1, J2, J3, dimmer pulse generator, pulse PWM dim driving chip, wherein infrared sensor
Output connects light-off delay circuit, and light-off delay circuit exports contact relay, and switch S switches AC power source and storage battery power supply mould
Formula, the contact relay J1-1 connect voltage stabilizing chip input terminal, and voltage stabilizing chip output connects dimmer pulse generator power end, dimmer pulse
Generator output connects pulse PWM light modulation driving chip enable end, and pulse PWM light modulation driving chip output connects LED light emitting diode
Lamps and lanterns.
Prior art among the above has the following deficiencies: due to can generate when PWM adjusts the light intensity of LED light
Shake, the invention can not determine PWM light modulation with the presence or absence of whether there is or not influences on infrared sensor of the human body.
Utility model content
The purpose of the utility model is to provide a kind of PWM output interference to influence verifying circuit to PIR human body sensing, has inspection
Testing PWM, whether there is or not the effects of influence on PIR.
The above-mentioned purpose of utility model of the utility model has the technical scheme that
A kind of PWM output interference influences verifying circuit to PIR human body sensing, comprising: is used to form the signal hair of pwm signal
Raw circuit, the signal generating circuit communication connection have to receive pwm signal and export the PIR data of PIR data processing signal
Processing circuit, power supply circuit, the power supply circuit are coupled to the PIR data processing circuit to the PIR number
It is powered according to processing circuit, the PIR data processing circuit is coupled with the PIR for examining the PIR data processing circuit output
Data processing signal has oscillograph without exception.
By using above-mentioned technical proposal, the pwm signal for the circuit output that signal occurs is exported by communication connection to PIR
Then data processing circuit checks PIR data processing circuit whether there is or not significantly being interfered by pwm signal, so as to right by oscillograph
PIR data processing circuit carries out the examination of pwm signal interference, in order to which pwm signal is adjusted to reduce to PIR data processing
The interference of circuit.
The utility model is further arranged to: the signal generating circuit includes: oscillating unit, is coupled to power supply and defeated
Oscillator signal out；PWM output unit is coupled to the oscillating unit to receive oscillator signal and output pwm signal；Control is single
Member is coupled to the PWM output unit to receive pwm signal and export control signal；Display unit is coupled to the control
Unit is to receive control signal and export display signal.
By using above-mentioned technical proposal, oscillating unit forms oscillator signal and exports to PWM output unit, PWM output
Unit obtains stable pwm signal after being analyzed and processed to oscillator signal, pwm signal output valve control unit, control unit with
Dimming operation is carried out to display unit, forms normal PIR data processing circuit in order to verify.
The utility model is further arranged to: the oscillating unit include: first comparator, first resistor, second resistance,
3rd resistor, the 4th resistance, the 5th resistance, first capacitor and first diode；First resistor is connected with second resistance, and first
Another termination power of resistance, second resistance other end ground connection；3rd resistor is connected with the 5th resistance, the other end of the 5th resistance
Ground connection, the other end of 3rd resistor are coupled to the reversed-phase output of first comparator, and it is separate that first capacitor is coupled to 3rd resistor
It is grounded behind one end of 5th resistance；First diode is connected with the 4th resistance, and the other end of first diode is coupled to third electricity
Between resistance and the 5th resistance, the other end of the 4th resistance is coupled to the non-inverting input terminal of first comparator；The first comparator
Non-inverting input terminal be coupled between first resistor and second resistance；The output end of first rate of exchange device is coupled to the one or two pole
Between tetra- resistance of Guan Yu.
By using above-mentioned technical proposal, power supply is charged by 3rd resistor and the 5th resistance to first capacitor, to make
The voltage value of first comparator inverting input terminal is negative voltage, and first capacitor exports low level full of rear first comparator, then the
One capacitor starts to discharge, and first capacitor is discharged to first comparator homophase input higher than inverting input terminal, then first comparator is defeated
High level out, to make the oscillator signal of first comparator output low and high level conversion.
The utility model is further arranged to: the PWM output unit includes: the second comparator, the 6th resistance, the 7th electricity
Resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first rheostat and the second diode；7th resistance and described first
The other end of rheostat series connection, the 7th resistance connects power supply, and the 8th resistance of first rheostatic another termination is followed by
Ground；The non-inverting input terminal of second comparator is coupled between the first rheostat and the 8th resistance；The reverse phase of second comparator
Input terminal is coupled between 3rd resistor and first comparator inverting input terminal；The output end of second comparator is coupled to
Six resistance, the other end of the 6th resistance are coupled to the second diode, and the other end of the second diode is coupled to the tenth resistance, described
It is grounded after being coupled to the 9th resistance between tenth resistance and the second diode；It is coupled between 9th resistance and the second diode
There is control unit.
By using above-mentioned technical proposal, the first rheostatic resistance value is adjusted, to adjust the second comparator non-inverting input terminal
Voltage value, the voltage value that the second comparator non-inverting input terminal is higher than in the oscillator signal that will be exported removes, to export mark
Quasi-, stable pwm signal.
The utility model is further arranged to: described control unit includes: metal-oxide-semiconductor, eleventh resistor and the 12nd electricity
Resistance；The grid of the metal-oxide-semiconductor is coupled between the 9th resistance and the second diode；It is single that the drain electrode of the metal-oxide-semiconductor is coupled to display
It is coupled between eleventh resistor and twelfth resistor after member；The source electrode of the metal-oxide-semiconductor is grounded.
By using above-mentioned technical proposal, eleventh resistor is in parallel with second resistance to provide a protective resistance, to prevent
Only power supply and metal-oxide-semiconductor are directly connected to the instantaneous high current generated damage, and simple by metal-oxide-semiconductor adjusting display unit.
The utility model is further arranged to: the PIR data processing circuit includes: infrared sensor of the human body, for examining
It surveys whether there is or not personnel and forms detection signal；Amplifying unit is coupled to people's infrared sensor to receive detection signal and believe detection
It number amplifies.
By using above-mentioned technical proposal, signal will test by amplifying unit again after infrared sensor of the human body detection human body
It amplifies, in order to which oscillograph is clear, accurately whether there is or not interfered by pwm signal for observation infrared sensor of the human body.
The utility model is further arranged to: the amplifying unit is by pre-amplification circuit, active bandpass filiter circuit
And the amplifying circuit that differential amplifier circuit is combined into.
By using above-mentioned technical proposal, pre-amplification circuit, active bandpass filiter circuit and differential amplifier circuit group
The amplifying circuit of synthesis, in order to form a stabilization, accurate amplifying circuit.
The utility model is further arranged to: the power supply circuit includes: the second capacitor of voltage-stablizer and third electricity
Hold；The input terminal of the voltage-stablizer is grounded after being coupled to the second capacitor, and electricity is connected between second capacitor and the voltage-stablizer
Source；The output end of the voltage-stablizer is grounded after being coupled to third capacitor.
By using above-mentioned technical proposal, the setting of the second capacitor and third capacitor can remove the noise voltage in power supply
It removes, to form a stable power supply signal.
In conclusion the advantageous effects of the utility model are as follows:
1. the pwm signal for the circuit output that signal occurs is exported by communication connection to PIR data processing circuit, then lead to
It crosses oscillograph and checks PIR data processing circuit whether there is or not significantly being interfered by pwm signal, to carry out to PIR data processing circuit
The examination of pwm signal interference, in order to the interference that pwm signal is adjusted to reduce to PIR data processing circuit；
2. oscillating unit forms oscillator signal and exports to PWM output unit, PWM output unit divides oscillator signal
Stable pwm signal is obtained after analysis processing, and pwm signal output valve control unit, control unit is to carry out light modulation behaviour to display unit
Make, forms normal PIR data processing circuit in order to verify.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
Appended drawing reference: 1, power supply circuit；2, signal generating circuit；21, oscillating unit；22, PWM output unit；23,
Control unit；24, display unit；3, PIR data processing circuit；31, infrared sensor of the human body；32, amplifying unit；4, oscillography
Device.
Specific embodiment
The utility model is described in further detail below in conjunction with attached drawing.
It referring to Figures 1 and 2, is that a kind of PWM output interference disclosed by the utility model is electric on the influence verifying of PIR human body sensing
Road, including power supply circuit 1, power supply supply coupling carry out detection human body and form the PIR number of PIR data processing signal
According to processing circuit 3,3 communication connection of PIR data processing circuit has signal generating circuit 2, and signal generating circuit 2 is used to form PWM
Signal, and PIR data processing circuit 3 is coupled with to detect the pwm signal of the formation of signal generating circuit 2 to PIR data processing electricity
Road 3 is whether there is or not the oscillograph 4 of influence, the pwm signal formed by signal generating circuit 2 and PIR data processing circuit 3 is felt
It answers, then checks that whether there is or not influences on PIR data processing circuit 3 from oscillograph 4, to carry out the interference of PIR data processing circuit 3
Investigation, in order to which PIR data processing circuit 3 can examine pwm signal whether there is or not being adjusted after influence, so that PIR data processing
Circuit 3 is stablized.
Signal generating circuit 2 includes: oscillating unit 21, PWM output unit 22, control unit 23 and display unit 24,
Oscillating unit 21 is coupled to power supply and forms oscillator signal, and PWM output unit 22 is coupled to oscillating unit 21 to receive oscillation letter
Number and output pwm signal, control unit 23 be coupled to PWM output unit 22 to receive pwm signal and export control signal, display
Unit 24 is coupled to control unit 23 to receive control signal and export display signal, leads to after 21 outputting oscillation signal of oscillating unit
It crosses PWM output unit 22 to be adjusted, then control unit 23 receives pwm signal to dim display unit 24.
PIR data processing circuit 3 includes: infrared sensor of the human body 31 and amplifying unit 32, infrared sensor of the human body 31
For detecting the presence of human body and forming detection signal, amplifying unit 32 is coupled to infrared sensor of the human body 31 to receive detection signal
And amplify the detection signal that infrared sensor of the human body 31 exports, by amplifying unit 32 by infrared sensor of the human body 31
Detection signal amplifies to be understood infrared sensor of the human body 31 whether there is or not by signal generating circuit 2 in order to which oscillograph 4 can be observed
The pwm signal of output influences.
Oscillating unit 21 includes: first comparator A1, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4, the 5th resistance R5, first capacitor C1 and first diode VD1, first resistor R1 connect with second resistance R2, first resistor
Another termination power of R1, second resistance R2 other end ground connection.3rd resistor R3 connects with the 5th resistance R5, the 5th resistance R5's
Other end ground connection, the other end of 3rd resistor R3 are coupled to the reversed-phase output of first comparator A1, and first capacitor C1 is coupled to
3rd resistor R3 is grounded behind one end far from the 5th resistance R5.First diode VD1 connects with the 4th resistance R4, first diode
The other end of VD1 is coupled between 3rd resistor R3 and the 5th resistance R5, and the other end of the 4th resistance R4 is coupled to first and compares
The non-inverting input terminal of device A1, the non-inverting input terminal of first comparator A1 are coupled between first resistor R1 and second resistance R2, the
The output end of one comparator A1 is coupled between first diode VD1 and the 4th resistance R4.When first comparator A1 just starts to lead to
When electric, then power supply is charged by 3rd resistor R3 and the 5th resistance R5 to first capacitor C1, and the voltage at the both ends first capacitor C1 is
The reverse side level of first comparator A1, the voltage for just starting first capacitor C1 is zero, as power supply continues first capacitor C1
Charging, first capacitor C1 both end voltage constantly increase, when the voltage of first comparator A1 inverting input terminal is greater than non-inverting input terminal
Voltage, the then voltage value that first comparator A1 is exported after first comparator A1 overturning become low level, then first capacitor C1 stops
Charging changes into electric discharge, when first capacitor C1 is during electric discharge, when the voltage value of first comparator A1 inverting input terminal is lower than
Homophase input terminal voltage value, then first comparator A1 overturns output high level again, so first comparator A1 output height electricity
Flat oscillator signal.PWM output unit 22 includes: the second comparator A2, the 6th resistance, the 7th resistance R7, the 8th resistance R8,
Nine resistance R9, the tenth resistance R10, the first rheostat RP1 and the second diode VD2, the 7th resistance R7 and the first rheostat RP1
Series connection, the other end of the 7th resistance R7 connect power supply, are grounded after the 8th resistance R8 of another termination of the first rheostat RP1, second
The non-inverting input terminal of comparator A2 is coupled between the first rheostat RP1 and the 8th resistance R8, and the reverse phase of the second comparator A2 is defeated
Enter end to be coupled between 3rd resistor R3 and first comparator A1 inverting input terminal, the output end of the second comparator A2 is coupled to
Six resistance, the other end of the 6th resistance are coupled to the second diode VD2, and the other end of the second diode VD2 is coupled to the tenth electricity
R10 is hindered, is grounded after being coupled to the 9th resistance R9 between the tenth resistance R10 and the second diode VD2, the 9th resistance R9 and the two or two
Control unit 23 is coupled between pole pipe VD2.First comparator A1 outputting oscillation signal to the second comparator A2 reverse side, and
It is exported compared with inverting input terminal after the voltage value of the second comparator A2 non-inverting input terminal is preset, in the tenth resistance R10 two
End generates pwm pulse signal, the duty ratio of the signal can by the voltage value that the second comparator A2 non-inverting input terminal is set come
It is adjusted, negative-phase sequence curent small feature when lower than the work of its pressure stabilizing value reverse phase is utilized in the second diode VD2, makes output
The low level of pwm signal can be close to zero point position, to export stable pwm signal.Control unit 23 includes metal-oxide-semiconductor, the tenth
One resistance R11 and twelfth resistor R12, the grid of metal-oxide-semiconductor are coupled between the 9th resistance R9 and the second diode VD2, MOS
The drain electrode of pipe is coupled between eleventh resistor R11 and twelfth resistor R12 after being coupled to display unit 24, the source electrode of metal-oxide-semiconductor
Ground connection.It is in parallel with twelfth resistor R12 to form protective resistance by eleventh resistor R11, to prevent power supply directly and metal-oxide-semiconductor
It is excessively high when being directly connected to occur current turns ON to have damaged metal-oxide-semiconductor, the voltage value of pwm signal can be received by the setting of metal-oxide-semiconductor
To carry out the voltage control of display unit 24.Display unit 24 is LED light, the anode of the drain electrode access LED light of metal-oxide-semiconductor, LED light
Cathode be coupled between eleventh resistor R11 and twelfth resistor R12 and be followed by power supply so that the light modulation of LED light is simple, simultaneously
Form pwm signal.
Amplifying unit 32 is the amplification being made of pre-amplification circuit, active bandpass filiter circuit and differential amplifier circuit
Circuit, pre-amplification circuit include: instrument amplifier, the second capacitor C2, thirteenth resistor R13, the second rheostat RP2 and
15 resistance R15；The model AD620 of instrument amplifier, after the non-inverting input terminal of instrument amplifier is coupled to the second capacitor C2
Infrared sensor of the human body 31 is connected, the inverting input terminal of the amplifier of instrument amplifier is grounded after being coupled to thirteenth resistor R13,
One end of second rheostat RP2 is coupled to the output end that the instrument amplifier other end is coupled to instrument amplifier, and instrument is amplified
The output end of device connects active bandwidth-limited circuit after being coupled to the 15th resistance R15, and there are two pre-amplification circuit settings.
Active bandpass filiter circuit includes: the first precision operational-amplifier, the 14th resistance R14, the 16th resistance R16, the 17th electricity
Resistance R17, third capacitor C3 and the 4th capacitor C4, the non-inverting input terminal of the first precision operational-amplifier are coupled to third capacitor C3
The 15th resistance R15 is connected afterwards, and the 14th resistance R14 is coupled between third capacitor C3 and the 15th resistance R15, the 4th capacitor
The one end C4 is coupled to the other end between the 14th resistance R14 and the 15th resistance R15 and is coupled to the first precision operational-amplifier
Output end, the 17th one end resistance R17 are coupled between third capacitor C3 and the non-inverting input terminal of the first precision operational-amplifier
The other end is coupled to the output end of the first precision operational-amplifier, and the inverting input terminal of the first precision operational-amplifier is coupled to
16 resistance R16 ground connection, the output end of the first precision operational-amplifier are coupled to differential amplifier circuit.Differential amplifier circuit packet
It includes: the second precision operational-amplifier, the 18th resistance R18, the 19th resistance R19, the 20 and the 21st electricity of the 20th resistance
Hinder R2, the model OP07 of the first precision operational-amplifier and the second precision operational-amplifier, and the second precision operational-amplifier
Non-inverting input terminal be coupled to the 18th resistance R18, the 19th one end resistance R19 is coupled to the essence of the 18th resistance R18 and second
The other end is coupled to the output end of the second precision operational-amplifier between close operational amplifier, the second precision operational-amplifier it is anti-
Phase input terminal is coupled to the 20th resistance 20, and the 21st one end resistance R2 is coupled to the 20th resistance 20 and the second accurate operation
The other end is grounded between amplifier, and the output end of the second precision operational-amplifier is coupled to oscillograph 4.Pass through pre-amplification circuit
Infrared sensor of the human body 31 is detected after signal amplifies and is again gone extra noise signal by active bandpass filiter circuit
After removing, then by differential amplifier circuit progress multiple amplification, in order to clearly, clearly PWM be watched to believe at oscillograph 4
Number on infrared sensor of the human body 31, whether there is or not influences.
The implementation principle of the present embodiment are as follows: first comparator A1 generates positive and negative alternate vibration by first capacitor C1 charge and discharge
Signal is swung, oscillator signal remove lower than the voltage value of the second comparator A2 inverting input terminal by the second comparator A2, from
And the second comparator A2 is made to export stable pwm signal, the voltage of pwm signal is adjusted and is formed to LED light by metal-oxide-semiconductor
Pwm signal is input to infrared sensor of the human body 31 by communication connection, and pre-amplification circuit exports infrared sensor of the human body 31
Detection signal amplify after again by active bandpass filiter circuit carry out excess voltage signal be removed, by amplification filter
The signal of wave carries out the secondary amplification of differential amplifier circuit, in order to which oscillograph 4 checks for apparent interference signal, in order to examine
Looking into pwm signal adjusting, whether there is or not influences on infrared sensor of the human body 31, in order to which removal pwm signal interference is adjusted.
The embodiment of present embodiment is the preferred embodiment of the utility model, and not limitation is originally practical new according to this
The protection scope of type, therefore: the equivalence changes that all structures, shape, principle according to the utility model are done should all be covered by practical
Within novel protection scope.
Claims (8)
1. a kind of PWM output interference influences verifying circuit to PIR human body sensing characterized by comprising be used to form PWM letter
Number signal generating circuit (2), signal generating circuit (2) communication connection has to receive pwm signal and export at PIR data
The PIR data processing circuit (3) of signal, power supply circuit (1) are managed, the power supply circuit (1) is coupled to the PIR number
According to processing circuit (3) to be powered to the PIR data processing circuit (3), the PIR data processing circuit (3) is coupled with
Examining the PIR data processing signal of PIR data processing circuit (3) output has oscillograph without exception (4).
2. a kind of PWM output interference according to claim 1 influences verifying circuit to PIR human body sensing, which is characterized in that
The signal generating circuit (2) includes:
Oscillating unit (21) is coupled to power supply and outputting oscillation signal；
PWM output unit (22) is coupled to the oscillating unit (21) to receive oscillator signal and output pwm signal；
Control unit (23) is coupled to the PWM output unit (22) to receive pwm signal and export control signal；
Display unit (24) is coupled to described control unit (23) to receive control signal and export display signal.
3. a kind of PWM output interference according to claim 2 influences verifying circuit to PIR human body sensing, which is characterized in that
The oscillating unit (21) include: first comparator, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
First capacitor and first diode；
First resistor is connected with second resistance, another termination power of first resistor, second resistance other end ground connection；
3rd resistor is connected with the 5th resistance, and the other end ground connection of the 5th resistance, the other end of 3rd resistor is coupled to the first ratio
Compared with the reversed-phase output of device, first capacitor is grounded after being coupled to the one end of 3rd resistor far from the 5th resistance；
First diode is connected with the 4th resistance, and the other end of first diode is coupled between 3rd resistor and the 5th resistance,
The other end of 4th resistance is coupled to the non-inverting input terminal of first comparator；
The non-inverting input terminal of the first comparator is coupled between first resistor and second resistance；
The output end of the first comparator is coupled between first diode and the 4th resistance.
4. a kind of PWM output interference according to claim 3 influences verifying circuit to PIR human body sensing, which is characterized in that
The PWM output unit (22) includes: the second comparator, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth electricity
Resistance, the first rheostat and the second diode；
7th resistance is connected with first rheostat, and the other end of the 7th resistance connects power supply, and described first becomes
It is grounded after hindering the 8th resistance of another termination of device；
The non-inverting input terminal of second comparator is coupled between the first rheostat and the 8th resistance；
The inverting input terminal of second comparator is coupled between 3rd resistor and first comparator inverting input terminal；
The output end of second comparator is coupled to the 6th resistance, and the other end of the 6th resistance is coupled to the second diode, the
The other end of two diodes is coupled to the tenth resistance, is coupled to the 9th resistance between the tenth resistance and the second diode and is followed by
Ground；
Control unit (23) are coupled between 9th resistance and the second diode.
5. a kind of PWM output interference according to claim 4 influences verifying circuit to PIR human body sensing, which is characterized in that
Described control unit (23) includes: metal-oxide-semiconductor, eleventh resistor and twelfth resistor；
The grid of the metal-oxide-semiconductor is coupled between the 9th resistance and the second diode；
The drain electrode of the metal-oxide-semiconductor is coupled between eleventh resistor and twelfth resistor after being coupled to display unit (24)；
The source electrode of the metal-oxide-semiconductor is grounded.
6. a kind of PWM output interference according to claim 1 influences verifying circuit to PIR human body sensing, which is characterized in that
The PIR data processing circuit (3) includes:
Infrared sensor of the human body (31), for detecting the presence of personnel and forming detection signal；
Amplifying unit (32) is coupled to people's infrared sensor to receive detection signal and amplify to detection signal.
7. a kind of PWM output interference according to claim 6 influences verifying circuit to PIR human body sensing, which is characterized in that
The amplifying unit (32) is the amplification being combined by pre-amplification circuit, active bandpass filiter circuit and differential amplifier circuit
Circuit.
8. a kind of PWM output interference according to claim 1 influences verifying circuit to PIR human body sensing, which is characterized in that
The power supply circuit (1) includes: the second capacitor of voltage-stablizer and third capacitor；
The input terminal of the voltage-stablizer is grounded after being coupled to the second capacitor, and electricity is connected between second capacitor and the voltage-stablizer
Source；
The output end of the voltage-stablizer is grounded after being coupled to third capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822132288.4U CN209327524U (en) | 2018-12-18 | 2018-12-18 | A kind of PWM output interference influences verifying circuit to PIR human body sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822132288.4U CN209327524U (en) | 2018-12-18 | 2018-12-18 | A kind of PWM output interference influences verifying circuit to PIR human body sensing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209327524U true CN209327524U (en) | 2019-08-30 |
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| CN201822132288.4U Active CN209327524U (en) | 2018-12-18 | 2018-12-18 | A kind of PWM output interference influences verifying circuit to PIR human body sensing |
Country Status (1)
| Country | Link |
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| CN (1) | CN209327524U (en) |
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2018
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