CN109374144A - A kind of temperature sensor of energy output pwm signal - Google Patents
A kind of temperature sensor of energy output pwm signal Download PDFInfo
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- CN109374144A CN109374144A CN201811344243.1A CN201811344243A CN109374144A CN 109374144 A CN109374144 A CN 109374144A CN 201811344243 A CN201811344243 A CN 201811344243A CN 109374144 A CN109374144 A CN 109374144A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/01—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using semiconducting elements having PN junctions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K2219/00—Thermometers with dedicated analog to digital converters
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Abstract
The present invention relates to a kind of temperature sensor of energy output pwm signal, multiple selector, ADC, control unit including sequential connection, and the pulse width detector being connect with multiple selector；Multiple selector is sent to ADC for selecting input signal, and by the signal of selection；ADC, the conversion for analog signal and digital signal；Control unit selects certain road signal for controlling multiple selector, and the digital multi-channel signal converted by ADC is stored in register；Pulse width detector obtains pwm switching signal, exports control signal by triggering and control external equipment for being compared with the difference of reference voltage by sawtooth signal according to the voltage of outside acquisition.The present invention is according to the order of microcontroller, the adjustable pwm signal control fan of the direct output duty cycle of internal calculation or heater.Sensor can also be monitored local temperature and this ground voltage other than detecting distal temperature.
Description
Technical field
The invention belongs to sensor design application field, specifically a kind of temperature sensor of energy output pwm signal.
Background technique
With computer, the development of microprocessing, semiconductor integration technology, the development of microprocessor and memory is continuous
Progress, sensing element and signal processing circuit can integrate on the same chip, enable the sensor to realize more perfect, more advanced
Function, lay a good foundation for the development of intelligence sensor.And Intelligent integrated multi-function monitoring sensor, as intelligent sensing
The important development direction of device class is paid attention to by country, has vast potential for future development.A kind of temperature biography of energy output pwm signal
Sensor can according to the PWM threshold value of setting, be directly realized by control fan or heater function, can be widely used in industry and
The fields such as automobile electronics, communications electronics product, consumption electronic product.
Summary of the invention
It is an object of the present invention to provide a kind of temperature sensors of energy output pwm signal, to simplify conventional microcontroller detection
The control mode of fan or heater is controlled after temperature again.
Present invention technical solution used for the above purpose is: a kind of temperature sensor of energy output pwm signal,
Multiple selector, ADC, control unit including sequential connection, and the pulse width detector being connect with multiple selector；
Multiple selector is sent to ADC for selecting input signal, and by the signal of selection；
ADC, the conversion for analog signal and digital signal；
Control unit selects certain road signal, and the digital multi-channel signal that will be converted by ADC for controlling multiple selector
It is stored in register；
Pulse width detector, for being carried out according to the voltage of outside acquisition and the difference of reference voltage by sawtooth signal
Compare, obtain pwm switching signal, control signal is exported by internal trigger and controls external equipment.
The multiple selector includes multipair input terminal；Input terminal is for accessing external acquisition signal.Using triode, three
The base stage of pole pipe and collector connects with the anode of a pair of of input terminal, emitter and the cathode connection to input terminal.
The multiple selector includes multiple selecting units；The selecting unit includes transistor M1~transistor M16；
The M1 grid, the connection of M2 grid, output end Out1, Out1- that M1 drain electrode, M2 drain respectively as the unit；
M3 grid, the connection of M4 grid, output end Out2, Out2- that M3 drain electrode, M4 drain respectively as the unit；M1 source electrode, the source M3
Pole, M5 drain electrode connection, M2 source electrode, M4 source electrode, M6 drain electrode connection, M5 grid, M6 grid respectively as the unit input terminal
In1, input terminal in1-, M5 source electrode, M6 source electrode drain with M7 and connect, and M7 source electrode is grounded through current source, and M7 grid is control terminal
s4；M1 grid, M3 grid are respectively as control terminal s2, control terminal s1；
The M9 grid, the connection of M10 grid, M9 drain electrode, M10 drain electrode connect with output end Out1, Out1- of the unit respectively
It connects；M11 grid, the connection of M12 grid, M11 drain electrode, M12 drain electrode are connect with output end Out2, Out2- of the unit respectively；The source M9
Pole, M11 source electrode, M13 drain electrode connection, M10 source electrode, M12 source electrode, M14 drain electrode connection, M13 grid, M14 grid are respectively as this
Input terminal in2, input terminal in2-, M13 source electrode, the M14 source electrode of unit drain with M16 and connect, and M16 source electrode connects through current source
Ground, M16 grid are control terminal s5；M12 grid, M10 grid are respectively as control terminal s1-, control terminal s2-；
The control terminal s1, control terminal s1-, control terminal s2, control terminal s2-, control terminal s4, control terminal s5 and control unit
Connection；
The input terminal in1 and input terminal in1-, input terminal in2 and input terminal in2- are respectively connected to external acquisition signal；
Output end Out1, Out1-, Out2, Out2- and ADC connection.
Received data are sent to external equipment by setting communication protocol by described control unit.
The pulse width detector includes the error amplifier being linked in sequence, PWM comparator, trigger, and and PWM
The oscillating circuit that comparator, trigger connect；
The error amplifier, for amplifying the difference of external collection voltages and reference voltage；Positive input and multichannel
A pair of of input anode of selector connects, and reverse input end exports direct current signal Ve extremely for accessing reference voltage, output end
PWM comparator；
PWM comparator, the saw of the oscillating circuit output of Ve and reverse input end access for accessing positive input
Tooth wave signal is compared, and obtains pwm switching signal；
Trigger, for according to the pwm switching signal of input terminal R and the oscillating circuit sawtooth signal of input terminal S,
So that pwm switching signal is kept original state, until next PWM comparator results export, is believed by the control that trigger exports
Number control external equipment.
The invention has the following beneficial effects and advantage:
1. sensor controls wind according to the order of microcontroller, the adjustable pwm signal of the direct output duty cycle of internal calculation
Fan or heater.
2. sensor can also be monitored local temperature and this ground voltage other than detecting distal temperature.
Detailed description of the invention
Fig. 1 sensor of the invention functional block diagram；
Multiple selector Fig. 2 of the invention designs circuit；
ADC Fig. 3 of the invention designs circuit _ integrator；
ADC Fig. 4 of the invention designs circuit _ integrator _ operation amplifier circuit；
ADC Fig. 5 of the invention designs circuit _ clocked comparator；
Pulse width detector schematic diagram Fig. 6 of the invention；
Error amplifier E/A circuit diagram Fig. 7 of the invention；
Fig. 8 sensor of the invention application block diagram.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
Temperature sensor of the invention is to tie the characteristic varied with temperature using the BE of triode in silicon-based electronic circuits, will
Temperature physical quantity is converted to electrical quantities, exports in digital form, by bus interface, temperature sensing function is realized, to carry out
The electronic component of temperature precise measurement.In the register BANK of sensor internal, PWM threshold value can be preset, is passed through
It is calculated with the value of distal temperature register, calculates the duty ratio of PWM output.The pwm signal of output can drive metal-oxide-semiconductor to lead
Logical or closing forms closed-loop system, and pulse width modulation is a kind of analog control mode, is adjusted according to the variation of respective loads
The biasing of transistor base or metal-oxide-semiconductor grid processed, to realize the change of transistor or metal-oxide-semiconductor turn-on time, to realize closure
The closure or disconnection of loop.Traditional control mode is microcontroller by temperature sensor acquisition temperature signal, is then counted
It calculates and obtains temperature value, control fan or heater according to the temperature value being calculated, then by the output that microcontroller carries out PWM.
Functional block diagram 1 shows the main functional modules of product.Input signal is selected by data selector, passes through control logic
Module is controlled.Control logic module is using the sequence that the mode in control register is management acquisition data and obtains data
Type.Obtaining data is fixed sequence are as follows: C1, C2, local temperature, followed by VCC.Wherein the combination of channel C 1 and C2 can
To detect distal temperature by connecting triode, ADC executes necessary conversion, then stores data in register BANK,
Control logic executes corresponding control according to command byte.Digital communication interface I2C is used for and microprocessor transmission control, state
With the data in data register.
As shown in Figure 1, being the functional block diagram of sensor.Distal temperature detection is varied with temperature using the BE knot of triode
Characteristic, temperature physical quantity is converted into electrical quantities, carries out analog-to-digital conversion using internal ADC, final digital quantity is stored in far
It holds in temperature register；Local temperature detection is to tie the characteristic varied with temperature using chip interior diode BE, by temperature object
Reason amount is converted to electrical quantities, and the conversion of modulus is carried out using the ADC in piece, and final digital quantity is stored in local temperature register
In；Local voltage detecting carries out the conversion of modulus using the ADC in piece, and final digital quantity is stored in local voltage register
In.Detection is by internal data selector and control logic while distal temperature, local temperature and this ground voltage
It realizes.Command byte register stores the read write command of microcontroller, and the storage of PWM threshold register calculates PWM duty cycle
Numerical value.
As shown in Fig. 2, being multiple selector design circuit.Multiple selector circuit has two-way input signal In1 and In2,
Two-way output signal Out1 and Out2.Whether control signal s1, s1-, s2, s2- and s3 are respectively used to control input signal output.
Transistor M1-M4 and transistor M9-M12 is switching tube in circuit, is controlled the control of signal s1 and s2 respectively.M5-M6 and
M13-M14 is respectively signal input tube, they constitute foldable structure with the switching tube being connected respectively.The work of multiple selector circuit
Principle is as follows: when the control signal s2 in circuit is high level, corresponding switching tube M1-M2 conducting, and the input signal of M5-M6
In1 is exported from Out1 output end, and is injected into junior's circuit and is handled.When signal s2- is high level, corresponding switch
The input signal In2 of pipe M9-M10 conducting, M9-M10 is exported from Out1 output end.When the control signal in circuit only has s1 for height
When level, corresponding switching tube M3-M4 conducting, the input signal In1 of M5-M6 is exported from Out2 output end, and is injected into junior
It is handled in circuit；When controlling signal there was only s1- is high level, corresponding switching tube M11-M12 conducting, from M13-M14
The signal In2 of input is exported from Out2 output end.Two-output impulse generator multiple selector has been achieved.
ADC is the prior art.Sigma-delta ADC is generally by sigma-delta modulator and down-sampled digital filter two parts
Composition.The sigma-delta modulator wherein to play a major role includes an integrator and clocked comparator.C in Fig. 3 integrator circuitS
For sampling capacitance, CPFor input terminal parasitic capacitance, CLParasitic capacitance is inputted for the output parasitic capacitance and junior's circuit of amplifier
Summation.In integrator design, important is operation amplifier circuit as shown in figure 4, left-half circuit is the biased electrical of amplifier
Road, using wide amplitude of oscillation image current source structure；Circuit middle section is the input stage of amplifier, and M15 and M16 use PMOS as fortune
The input pipe put is made in individual trap, is conducive to inhibit substrate noise.Output end is improved using cascode structure
The DC current gain of amplifier, while also meeting the requirement of output voltage swing.Clocked comparator in design is using latch structure
Comparator.In order to make comparator meet the requirement in timing, comparator is designed to edge-triggered, as shown in Figure 5.Latch
Input is added in the grid of M1 and M2.M1 and M2 work is in triode linear zone.Input value will be M3 and M4 source electrode to ground electricity
Resistance changes.When latch enables, i.e. when clk is high level, the drain electrode of M3 and M4 will be connected to the output of latch.M3 and M4
Constitute the parallel positive feedback path of latch.Rest-set flip-flop must be added in the output end of latch, because when clk is low level
When, latch enters reset mode, at this point, the output of latch be it is low, so that its output is kept original shape by rest-set flip-flop
State, until next comparator results export.
As shown in fig. 6, being pulse width detector schematic diagram.It has a Voltage Feedback ring, is modulated using pulse width
Method is believed the sawtooth wave of the slowly varying direct current signal Ve and constant frequency of voltage error amplifier (E/A) amplifier
It number compares, by pulse width modulation principle, obtains pulse width t appropriateon, which obtains
Switch controlled signal VG.The schematic diagram of the error amplifier E/A wherein to play a major role as shown in fig. 7, E/A module function
It is the difference for amplifying output voltage sampling and reference voltage, which obtains compared with the sawtooth signal that oscillator module exports
Pwm switching signal.In Fig. 7, MP4 and MP5 constitute the Differential Input pair of amplifier, by respectively by MN1, MN2, MN12,
MN13 and MN3, MN4, the current mirror that MN5, MN14 are constituted go out differential pair tube drain terminal current mirror, and pass through MP1, MP2,
MP11, MP12 constitute current mirror two difference currents are subtracted each other and are exported, wherein MN4 and MN3 mirror image ratio be K, MP2 and
The mirroring ratios of MP1 are K.Remaining current mirror mirror ratio is 1, makes K times that exports the current difference that electric current flows through differential pair tube.
Voltage error amplifier is the prior art, and VN accesses feedback voltage VFB, VP access reference voltage Vref.
As shown in figure 8, being the application block diagram of sensor.Including two parts, respectively the peripheral applications circuit of sensor
And the control circuit of microcontroller.Channel C 1 and C2 constitute distal temperature detection module by connecting triode V1, realize
The acquisition of temperature.Multiple selector includes multipair input terminal, and each pair of input terminal can connect temperature detecting module, voltage, sampling
One of resistance (detection electric current).The present embodiment connects temperature detecting module, using triode, the base stage and current collection of triode
Extremely with a pair of of input terminal anode connect, emitter and this to input terminal cathode connection.Sampling resistor both ends are respectively with one
Anode, the cathode of input terminal are connected.Data after acquisition are converted through ADC, and the distal temperature being stored in register BANK is posted
In storage.Microcontroller passes through the digital communication interface I of standard2C is written and read command operation, including PWM threshold value to sensor
Setting and command byte setting.The channel PWM according to the distal temperature in register BANK, PWM threshold value and command byte with
And pulse width detector, the adjustable pwm signal of output duty cycle, pwm signal are realized to fan or are added by driving circuit
The control of hot device.
Claims (5)
1. it is a kind of can output pwm signal temperature sensor, which is characterized in that multiple selector, ADC including sequential connection,
Control unit, and the pulse width detector being connect with multiple selector；
Multiple selector is sent to ADC for selecting input signal, and by the signal of selection；
ADC, the conversion for analog signal and digital signal；
Control unit selects certain road signal for controlling multiple selector, and the digital multi-channel signal converted by ADC is stored in
Register；
Pulse width detector, for being compared according to the voltage of outside acquisition and the difference of reference voltage by sawtooth signal
Compared with, obtain pwm switching signal, pass through internal trigger output control signal control external equipment.
2. a kind of temperature sensor of energy output pwm signal according to claim 1, which is characterized in that the multichannel choosing
Selecting device includes multipair input terminal；Input terminal is for accessing external acquisition signal.
3. a kind of temperature sensor of energy output pwm signal according to claim 1, which is characterized in that the multichannel choosing
Selecting device includes multiple selecting units；The selecting unit includes transistor M1~transistor M16；
The M1 grid, the connection of M2 grid, output end Out1, Out1- that M1 drain electrode, M2 drain respectively as the unit；M3 grid
Pole, the connection of M4 grid, output end Out2, Out2- that M3 drain electrode, M4 drain respectively as the unit；M1 source electrode, M3 source electrode, M5
Drain electrode connection, M2 source electrode, M4 source electrode, M6 drain electrode connection, M5 grid, M6 grid respectively as the unit input terminal in1, input
In1- is held, M5 source electrode, M6 source electrode drain with M7 and connect, and M7 source electrode is grounded through current source, and M7 grid is control terminal s4；M1 grid
Pole, M3 grid are respectively as control terminal s2, control terminal s1；
The M9 grid, the connection of M10 grid, M9 drain electrode, M10 drain electrode are connect with output end Out1, Out1- of the unit respectively；
M11 grid, the connection of M12 grid, M11 drain electrode, M12 drain electrode are connect with output end Out2, Out2- of the unit respectively；M9 source electrode,
M11 source electrode, M13 drain electrode connection, M10 source electrode, M12 source electrode, M14 drain electrode connection, M13 grid, M14 grid are respectively as the unit
Input terminal in2, input terminal in2-, M13 source electrode, M14 source electrode drain and connect with M16, M16 source electrode is grounded through current source, M16
Grid is control terminal s5；M12 grid, M10 grid are respectively as control terminal s1-, control terminal s2-；
The control terminal s1, control terminal s1-, control terminal s2, control terminal s2-, control terminal s4, control terminal s5 and control unit connect
It connects；
The input terminal in1 and input terminal in1-, input terminal in2 and input terminal in2- are respectively connected to external acquisition signal；
Output end Out1, Out1-, Out2, Out2- and ADC connection.
4. a kind of temperature sensor of energy output pwm signal according to claim 1, which is characterized in that the control is single
Received data are sent to external equipment by setting communication protocol by member.
5. a kind of temperature sensor of energy output pwm signal according to claim 1, which is characterized in that the pulse is wide
Degree detector includes the error amplifier being linked in sequence, PWM comparator, trigger, and is connect with PWM comparator, trigger
Oscillating circuit；
The error amplifier, for amplifying the difference of external collection voltages and reference voltage；Positive input and multi-path choice
A pair of of input anode of device connects, and reverse input end exports direct current signal Ve to PWM ratio for accessing reference voltage, output end
Compared with device；
PWM comparator, the sawtooth wave of the oscillating circuit output of Ve and reverse input end access for accessing positive input
Signal is compared, and obtains pwm switching signal；
Trigger, for making PWM according to the pwm switching signal of input terminal R and the oscillating circuit sawtooth signal of input terminal S
Switching signal keeps original state, until next PWM comparator results export, is controlled by the control signal that trigger exports
External equipment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811344243.1A CN109374144B (en) | 2018-11-13 | 2018-11-13 | Temperature sensor capable of outputting PWM signal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811344243.1A CN109374144B (en) | 2018-11-13 | 2018-11-13 | Temperature sensor capable of outputting PWM signal |
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| CN109374144B CN109374144B (en) | 2021-07-27 |
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| CN110995204A (en) * | 2019-12-12 | 2020-04-10 | 思瑞浦微电子科技（苏州）股份有限公司 | Oscillator for outputting multiple duty ratio pulse signals |
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| CN112665743A (en) * | 2020-12-18 | 2021-04-16 | 中国电子科技集团公司第四十七研究所 | Multi-channel monolithic digital temperature sensor with pulse width modulation output |
| CN114336566A (en) * | 2021-11-22 | 2022-04-12 | 珠海格力电器股份有限公司 | Circuit structure for realizing universal wiring terminal |
| CN117091712A (en) * | 2023-10-20 | 2023-11-21 | 杭州得明电子有限公司 | Manganese copper temperature testing method and device for IR46 Internet of things meter |
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| CN110995204A (en) * | 2019-12-12 | 2020-04-10 | 思瑞浦微电子科技（苏州）股份有限公司 | Oscillator for outputting multiple duty ratio pulse signals |
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| CN112665743A (en) * | 2020-12-18 | 2021-04-16 | 中国电子科技集团公司第四十七研究所 | Multi-channel monolithic digital temperature sensor with pulse width modulation output |
| CN112665743B (en) * | 2020-12-18 | 2022-10-04 | 中国电子科技集团公司第四十七研究所 | Multi-channel monolithic digital temperature sensor with pulse width modulation output |
| CN114336566A (en) * | 2021-11-22 | 2022-04-12 | 珠海格力电器股份有限公司 | Circuit structure for realizing universal wiring terminal |
| CN114336566B (en) * | 2021-11-22 | 2023-04-28 | 珠海格力电器股份有限公司 | Circuit structure for realizing universal wiring terminal |
| CN117091712A (en) * | 2023-10-20 | 2023-11-21 | 杭州得明电子有限公司 | Manganese copper temperature testing method and device for IR46 Internet of things meter |
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