CN207764249U - Tachometric survey driving circuit - Google Patents
Tachometric survey driving circuit Download PDFInfo
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- CN207764249U CN207764249U CN201721744741.6U CN201721744741U CN207764249U CN 207764249 U CN207764249 U CN 207764249U CN 201721744741 U CN201721744741 U CN 201721744741U CN 207764249 U CN207764249 U CN 207764249U
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Abstract
The utility model provides a kind of tachometric survey driving circuit, and the tachometric survey driving circuit includes regulator circuit, monostable circuit and current driving circuit, wherein：One tach signal is provided to the monostable circuit, and the frequency of the tach signal and rotating speed to be measured are in direct ratio, so that monostable circuit output one measures voltage, the duty ratio for measuring voltage is positively correlated relationship with the rotating speed to be measured；The measurement voltage is converted to driving current by the current driving circuit, and the size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio；The regulator circuit connects a main power source by voltage regulation resistance, to generate the source of stable pressure.The utility model can obtain driving current by the setting of current driving circuit, and without the mode of circuit external parallel connection bulky capacitor, and current driving circuit can be integrated in inside driving chip, small, and reliability is high.
Description
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of tachometric survey driving circuit.
Background technology
Tachometric survey driving circuit is used to rotating speed (rotating speed of such as motorcycle or automobile) signal of motor vehicle generating electricity
Signal is flowed, for driving the gauge outfit of instrument board to indicate rotating speed.
In the prior art, tachometric survey driving circuit generates the duty ratio current signal proportional to rotating speed, then
By a bulky capacitor constant-current source is obtained to stablize waveform.But the cost of bulky capacitor and volume are larger, increase product at
This, reduces usage experience.
Utility model content
The purpose of this utility model is to provide a kind of tachometric survey driving circuits, are driven with solving existing tachometric survey
The problem of circuit needs bulky capacitor to obtain driving current.
In order to solve the above technical problems, the utility model provides a kind of tachometric survey driving circuit, the tachometric survey is driven
Dynamic circuit includes regulator circuit, monostable circuit and current driving circuit, wherein：
The monostable circuit couples a tach signal, and the frequency of the tach signal is directly proportional to rotating speed to be measured
Example, the output end of the monostable circuit provide one and measure voltage, and the duty ratio for measuring voltage turns with described to be measured
Rapid-result positive correlation；
The current driving circuit couples the output end of the monostable circuit, and the current driving circuit coupling is with a scale
Rotating speed display device in load pointer, size and the rotating speed to be measured of the driving current of current driving circuit output
Corresponding scale is in direct ratio；
The regulator circuit couples the monostable circuit and the current driving circuit, one master of regulator circuit coupling
Power supply is to generate source of stable pressure.
Optionally, in the tachometric survey driving circuit, the monostable circuit includes bleeder circuit, charging circuit
And holding circuit, wherein：
The bleeder circuit handles the tach signal, formation turnover voltage, in first half cycle, when the rotating speed
Signal by the first level translation be second electrical level when, the turnover voltage is transformed to the first level, later half period by second electrical level
Interior, when the tach signal is transformed to the first level by second electrical level, the turnover voltage is the second electricity by the first level translation
Flat, the turnover voltage inputs to the charging circuit；
The charging circuit is charged when turnover voltage is transformed to the first level by second electrical level with the set time, is formed
Charging voltage, the charging voltage feed back to the turnover voltage, so that the turnover voltage is in the preceding half cycle except the set time
In phase, it is transformed to third level；
The holding circuit exports the measurement voltage of second electrical level within the set time, in its of a cycle
He exports the measurement voltage of the first level in the time.
Optionally, in the tachometric survey driving circuit, the bleeder circuit include first resistor, second resistance and
First triode, wherein：
Described first resistor one end connects the collector of first triode, the other end connection of the first resistor the
Two resistance and the charging circuit, the second resistance other end connect source of stable pressure；
The base stage of first triode inputs the tach signal, the emitter ground connection of first triode.
Optionally, in the tachometric survey driving circuit, the charging circuit includes emitter follower, the five or three pole
Pipe, charging capacitor, charging resistor, the 4th capacitance, third transistor, the 4th triode, the 8th resistance and the 9th resistance, wherein：
The junction of input terminal the connection first resistor and second resistance of emitter follower, the output of the emitter follower
End connects the first end of the charging capacitor；
The collector of 5th triode connects the input terminal of the emitter follower, the base stage of the 5th triode
Connect the collector of the 4th triode, the emitter ground connection of the 5th triode；
The first end of second end the connection charging resistor and the 4th capacitance of the charging capacitor, the charging resistor other end
Connect source of stable pressure, the second end ground connection of the 4th capacitance；
The base stage of the third transistor connects the second end of the charging capacitor, and the collector of the third transistor connects
The 9th resistance is connect, the emitter of the third transistor connects the base stage of the 4th triode, and the other end of the 9th resistance connects institute
State source of stable pressure；
The collector of 4th triode connects a first voltage, the transmitting of the 4th triode by the 8th resistance
Pole is grounded.
Optionally, in the tachometric survey driving circuit, the holding circuit includes the first operational amplifier, second
Triode, the 4th resistance, the 5th resistance and holding resistance, wherein：
The base stage of second triode connects the collector of the third transistor, the collector connection of the second triode
Current driving circuit, emitter connect the inverting input of first operational amplifier；
Described 4th resistance one end connects the in-phase input end of first operational amplifier, other end ground connection, and described the
Five resistance one end connect the in-phase input end of first operational amplifier, and the other end connects the source of stable pressure；
The inverting input for keeping resistance one end to connect first operational amplifier, other end ground connection；
The output end of first operational amplifier connects the collector of the third transistor.
Optionally, in the tachometric survey driving circuit, the current driving circuit includes current mirroring circuit, integral
Circuit and voltage follower circuit, wherein：
The measurement voltage is converted to measurement electric current by the current mirroring circuit, and the integrating circuit is to the measurement electric current
It is integrated, forms integral voltage, the integral voltage is converted to the driving current by the voltage follower circuit, described
Driving current drives the load indicators turn in the rotating speed display device, to show the scale corresponding to rotating speed to be measured.
Optionally, in the tachometric survey driving circuit, the current mirroring circuit includes the 6th triode, the seven or three
Pole pipe, the 8th triode and the 9th triode, wherein：
The emitter of 6th triode connects the source of stable pressure, the collector connection the eight or three of the 6th triode
The base stage of the emitter of pole pipe, the 6th triode connects the base stage of the 7th triode, the base of the 6th triode
Pole is connected with collector；
The emitter of 7th triode connects the source of stable pressure, the collector connection the 9th 3 of the 7th triode
The emitter of pole pipe；
The collector of 8th triode connects the monostable circuit, described in the base stage connection of the 8th triode
The base stage of the base stage of 9th triode, the 8th triode is connected with collector；
The collector of 9th triode as the output end of current mirroring circuit connect the integrating circuit and voltage with
With device circuit.
Optionally, in the tachometric survey driving circuit, the integrating circuit includes the 6th resistance and third capacitance,
Wherein：
The first end of 6th resistance connects the output end of the current mirroring circuit, other end ground connection；
The third capacitance and the 6th resistor coupled in parallel.
Optionally, in the tachometric survey driving circuit, the voltage follower circuit includes the second operation amplifier
Device, the tenth triode and driving resistance, wherein：
The in-phase input end of the second operational amplifier connects the first end of the 6th resistance, and second operation is put
One end of the inverting input connection driving resistance of big device, driving resistance other end ground connection, the second operational amplifier it is defeated
Outlet connects the base stage of the tenth triode；
The emitter of tenth triode connects the inverting input of the second operational amplifier, and collector is for carrying
For driving current.
Optionally, in the tachometric survey driving circuit, the tachometric survey driving circuit further includes that Schmidt touches
Device circuit is sent out, the tach signal is provided to the input terminal of the Schmitt trigger circuit, the Schmitt trigger circuit
Output end connect the monostable circuit.
In tachometric survey driving circuit provided by the utility model, be converted to by current driving circuit by voltage is measured
Driving current, the size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio, realize and pass through electric current
The setting of driving circuit obtains driving current, without the mode of circuit external parallel connection bulky capacitor, and electric current driving current
It can be integrated in inside driving chip, small, reliability is high.
Description of the drawings
Fig. 1 is one embodiment tachometric survey drive circuit schematic diagram of the utility model；
Fig. 2 is one embodiment tachometric survey drive circuit schematic diagram of the utility model；
Fig. 3 is another embodiment tachometric survey drive circuit schematic diagram of the utility model；
Fig. 4~5 are another embodiment tachometric survey driving circuit signal waveform schematic diagrames of the utility model；
As shown in the figure：11- regulator circuits；12- monostable circuits；121- bleeder circuits；122- charging circuits；123- is kept
Circuit；13- current driving circuits；131- current mirroring circuits；132- integrating circuit；133- voltage follower circuits；14- Schmidts
Flip-flop circuit.
Specific implementation mode
Below in conjunction with the drawings and specific embodiments to the utility model proposes tachometric survey driving circuit make further it is detailed
It describes in detail bright.According to following explanation and claims, will be become apparent from feature the advantages of the utility model.It should be noted that attached
Figure is all made of very simplified form and uses non-accurate ratio, only new conveniently, lucidly to aid in illustrating this practicality
The purpose of type embodiment.
The core concept of the utility model is to provide a kind of tachometric survey driving circuit, to solve existing tachometric survey
The problem of driving circuit needs bulky capacitor to obtain driving current.
To realize that above-mentioned thought, the utility model provide a kind of tachometric survey driving circuit, the tachometric survey driving
Circuit includes regulator circuit, monostable circuit and current driving circuit, wherein：One tach signal is provided to the monostable electricity
Road, the frequency of the tach signal and rotating speed to be measured are in direct ratio, so that monostable circuit output one measures voltage,
The duty ratio for measuring voltage is positively correlated relationship with the rotating speed to be measured；The current driving circuit is by the measurement
Voltage is converted to driving current, and the driving current is used to drive load pointer to be rotated in rotating speed display device with a scale,
The size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio；The regulator circuit coupling is described monostable
State circuit and the current driving circuit, the regulator circuit couple a main power source to generate source of stable pressure.Positive correlation refers to survey
The duty ratio for measuring voltage increases with rotating speed to be measured and is increased, and the duty ratio for measuring voltage reduces with rotating speed to be measured and subtracted
It is small.In one embodiment, the duty ratio of voltage and the rotating speed direct proportionality to be measured are measured.
<Embodiment one>
The present embodiment provides a kind of tachometric survey driving circuits, as shown in Figures 1 to 3, the tachometric survey driving circuit packet
Regulator circuit 11, monostable circuit 12 and current driving circuit 13 are included, wherein：One tach signal Vin is provided to the monostable
Circuit 12, the frequency of the tach signal Vin and rotating speed to be measured are in direct ratio, so that the output of the monostable circuit 12 one
Voltage VO1 is measured, the duty ratio for measuring voltage VO1 is positively correlated relationship with the rotating speed to be measured；The electric current drives
The measurement voltage VO1 is converted to driving current Iw by dynamic circuit 13, and the driving current is for driving load pointer to be carved in band
It is rotated in the rotating speed display device of degree, the size of the driving current Iw is directly proportional to the scale corresponding to rotating speed to be measured
Example；The regulator circuit 11 couples the monostable circuit 12 and the current driving circuit 13, and the regulator circuit 11 couples
One main power source VCC, to generate the source of stable pressure VDD.In one embodiment, regulator circuit 11 is led by voltage regulation resistance Rw connections
Power supply VCC.Specifically, the internal reference chip power supply that VCC is integrated by Rw to one, generates 4.7V source of stable pressure VDD, this voltage
It works for internal circuit.
Vin is speed-frequency signal, and the tachometric survey driving circuit further includes Schmitt trigger circuit I1, described to apply
The output end of schmitt trigger circuit I 1 connects the monostable circuit, and the tach signal is provided to the Schmidt trigger
The input terminal of I1, and rectification is carried out to tach signal by the Schmitt trigger circuit I1, pass through Schmitt trigger circuit
I1 carries out waveform shaping, so that the signal of input is more smooth, removes sparkle noise.
Specifically, in the tachometric survey driving circuit, as shown in figures 2-3, the monostable circuit 12 includes point
Volt circuit 121, charging circuit 122 and holding circuit 123, wherein：The bleeder circuit 121 carries out the tach signal Vin
Processing forms turnover voltage Vpin3 (voltage at the interior joints of Fig. 2~3 3), as shown in Figures 4 and 5, in first half cycle, when described
Tach signal Vin by the first level translation be second electrical level when, the turnover voltage Vpin3 by second electrical level be transformed to first electricity
Usually, in the later half period, when the tach signal Vin is transformed to the first level by second electrical level, the turnover voltage Vpin3 by
First level translation is second electrical level, and the turnover voltage Vpin3 inputs to the charging circuit；The charging circuit 122 exists
It when turnover voltage Vpin3 is transformed to the first level by second electrical level, is charged with the set time, forms charging voltage Vpin4 (Fig. 2
Voltage at~3 interior joints 4), the charging voltage Vpin4 is fed back by third transistor, the 4th triode, the 5th triode
To the turnover voltage Vpin3, so that the turnover voltage Vpin3 is transformed to third in the first half cycle except the set time
Level；The holding circuit 123 exports the measurement voltage VO1 of second electrical level within the set time, in its of a cycle
He exports the measurement voltage of the first level in the time.
Further, to the same signal, the voltage of the first level is less than the voltage of its second electrical level, art technology
For personnel it is to be understood that the first level is low level, second electrical level is high level；In addition, being described as low and high level, only relatively
In the same signal and for describing the rising edge and failing edge checker of the signal, but those skilled in the art should be understood that for
The low level of different signals, a signal could possibly be higher than the high level of another signal.Wherein, in the present embodiment, for turning over
Turning voltage and tach signal, the first level of signified turnover voltage and tach signal is low level, and value range is 0V~1V, the
One level is the voltage that NPN type triode will not be made to be connected.On the contrary, second electrical level is high level, value range be more than 3V,
Second electrical level is the voltage that NPN type triode can be made to be connected, and for measuring voltage, the first level is less than 100mV, the second electricity
It puts down as more than 300mV.
Specifically, in the tachometric survey driving circuit, the bleeder circuit includes first resistor R1, second resistance
R2 and the first triode Q1, the first triode Q1 is NPN type triode, wherein：Vin generates voltage division signal at R1, R2.It is described
The one end first resistor R1 connects the collector of the first triode Q1, and the other end of the first resistor R1 connects second resistance
R2 and the charging circuit, the second resistance R2 other ends connection source of stable pressure VDD；The base stage of the first triode Q1 inputs
The emitter of the tach signal Vin, the first triode Q1 are grounded, when tach signal is the first level (low level),
Q1 is turned off, and the voltage division signal that R1 and R2 are generated is high level, when tach signal is second electrical level (high level), Q1 conductings, and R1
It is low level with the voltage division signal that R2 is generated, the function of bleeder circuit is to overturn the signal rising edge and failing edge of Vin, is formed
Turnover voltage.
In addition, in the tachometric survey driving circuit, the charging circuit includes emitter follower I2, the five or three pole
Pipe Q5, charging capacitor Ct, charging resistor Rt, the 4th capacitance C4, third transistor Q3, the 4th triode Q4, the 8th resistance R8 and
9th resistance R9, the 5th triode Q5, third transistor Q3 and the 4th triode Q4 are NPN type triode, wherein：Emitter following
The junction of input terminal connection the first resistor R1 and second resistance R2 of device I2, the output end of the emitter follower I2 connect institute
State the first end of charging capacitor Ct；The collector of the 5th triode Q5 connects the input terminal of the emitter follower I2, institute
The base stage for stating the 5th triode Q5 connects the collector of the 4th triode Q4, and the emitter of the 5th triode Q5 connects
Ground；The first end of second end connection the charging resistor Rt and the 4th capacitance C4 of the charging capacitor Ct, the charging resistor Rt are another
One end connects the second end ground connection of source of stable pressure VDD, the 4th capacitance C4；It is filled described in the base stage connection of the third transistor Q3
The collector of the second end of capacitance Ct, the third transistor Q3 connects the 9th resistance R9, the hair of the third transistor Q3
Emitter-base bandgap grading connects the base stage of the 4th triode Q4, and the other end of the 9th resistance R9 connects the source of stable pressure VDD；4th triode
For the collector of Q4 by one first voltage of the 8th resistance R8 connections, the first voltage is the voltage source of 1.4V, the described 4th 3
The emitter of pole pipe Q4 is grounded.
When turnover voltage is the first level (low level), there are voltage difference, VDD to be given by Rt between VDD and turnover voltage
Ct charges, and by charging time of 0.64RtCt, (charging time is fixed, is determined by the value of Rt and Ct, can be according to not
Same demand, such as driving current size, frequency of tach signal etc. are chosen), from charging voltage from low level it is charged to opening for Q3
When opening near voltage 1.4V, Q3, Q4 start but not fully on, and Q5 starts but not completely switched off.The input terminal of I2 in this way
(R1 and R2 tie points) and from low level close to 0V (being 0V when Q5 is connected), 2.1V or so (4.7V* (R1/ (R1+R2)) are risen to
=2.1V), such turnover voltage rises to 1.4V or so, i.e., the described charging voltage passes through third transistor, the 4th triode,
Five triodes feed back to the turnover voltage, so that the turnover voltage in the first half cycle except the set time, is transformed to
Three level, third level are 1.4V (2.1V-0.7V=1.4V, wherein 0.7V is the voltage drop that electric current passes through I2), charging voltage
Also because the reason of the Ct capacitance other ends (bootstrap effect of capacitance prevent the pressure drop on capacitance in moment from being mutated), quickly rise
To 1.4V, keep Q3, Q4 fully on.In this way, the collector of Q3, which is exported from high level, becomes low level.Until next week
Phase, Vin from low get higher when, turnover voltage is lower from height, and the bootstrap effect of capacitance prevents the pressure drop on capacitance in moment from being mutated,
To charging voltage is also lower from height (the capacitance size of C4 can adjust the low level amplitude of charging voltage, and capacitance is bigger,
Charging voltage fall is smaller), the collector of Q3, which is exported from low level, becomes high level.In this way, repeat begin the above Rt to
The process of Ct chargings.
Specifically, in the tachometric survey driving circuit, the holding circuit includes the first operational amplifier U1, the
Two triode Q2, the 4th resistance R4, the 5th resistance R5 and holding resistance RL1, the second triode Q2 are NPN type triode, wherein：
The base stage of the second triode Q2 connects the collector of the third transistor Q3, and the collector of the second triode Q2 connects
Current driving circuit is connect, the emitter of the second triode Q2 connects the inverting input of the first operational amplifier U1；
The one end the 4th resistance R4 connects the in-phase input end of the first operational amplifier U1, other end ground connection, the 5th electricity
The one end resistance R5 connects the in-phase input end of the first operational amplifier U1, and the other end connects the source of stable pressure VDD；The holding
The one end resistance RL1 connects the inverting input of the first operational amplifier U1, other end ground connection；First operational amplifier
The output end of U1 connects the collector of the third transistor Q3.
Specifically, U1 plays the role of negative-feedback, when Q3 and Q4 is turned off (in the charging time), the collector output of Q3 is high
Level, Q2 conductings, the anode the input phase etc. of VO1 current potentials and U1, the negative-feedback of U1 ensure that the collector output of Q3 is provided by Q2
To the voltage of VO1=VDD* (R4/ (R4+R5)).VO1 is exported with the collector of Q3, and generates low and high level variation, high level
Time is 0.64RtCt, low level 0V.The holding circuit exports the measurement voltage of second electrical level within the set time
VO1 exports the measurement voltage of the first level in the other times of a cycle, i.e., only when turnover voltage is the first level,
It measures voltage and keeps second electrical level, when turnover voltage is second electrical level and third level, measures voltage and keep the first level.It can
See, measures the failing edge of voltage and determine that unrelated with the failing edge of Vin, rising edge is determined by Vin with the charging time.
Further, the primary drive that a turn-on time fixes (0.64RtCt) is generated at the collector of the second triode Q2
The current amplitude of streaming current, the primary driving current is VO1/RL1=VDD* (R4/ (R4+ in the second triode Q2 conductings
R5 the waveform of))/RL1, VO1 are as shown in Figure 4.The current driving circuit includes the first electricity in parallel with rotating speed display device Iw
Hold C1, the driving current drives the load indicators turn in the rotating speed display device Iw, to show rotating speed institute to be measured
Corresponding scale, the first capacitance C1 is in parallel with the rotating speed display device Iw, and the first end of the first capacitance C1 connects
The main power source VCC is met, the second end of the first capacitance C1 connects the monostable circuit 12, specifically, connection the two or three
The collector of pole pipe Q2.Primary driving current at the collector of second triode Q2 is formed after the first capacitance C1 shaping filters
The load pointer stablized in the driving current driving rotating speed display device Iw of waveform is rotated, to show rotating speed institute to be measured
Corresponding scale.Preferably, C1 1000uF.
To sum up, the various configuration of tachometric survey driving circuit is described in detail in above-described embodiment, certainly, this practicality
Cited configuration in novel including but not limited to above-mentioned implementation, it is any to be carried out on the basis of the configuration of above-described embodiment offer
The content of transformation belongs to the range that the utility model is protected.Those skilled in the art can be according in above-described embodiment
Appearance is drawn inferences about other cases from one instance.
<Embodiment two>
The present embodiment further provides preferable side on the basis of the tachometric survey driving circuit of a upper embodiment
Case, the tachometric survey driving circuit include regulator circuit, monostable circuit and current driving circuit, wherein：One tach signal
It is provided to the monostable circuit, the frequency of the tach signal and rotating speed to be measured are in direct ratio, so that the monostable
Circuit output one measures voltage, and the duty ratio for measuring voltage is positively correlated relationship with the rotating speed to be measured；The electricity
The measurement voltage is converted to driving current by stream driving circuit, and the driving current is for driving load pointer with a scale
It is rotated in rotating speed display device, the size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio；It is described
Regulator circuit couples the monostable circuit and the current driving circuit, and the regulator circuit couples a main power source, to generate
The source of stable pressure.In one embodiment, the regulator circuit in embodiment two and the physical circuit of monostable circuit and a upper reality
It is identical to apply example.
Further, as shown in figure 3, the current driving circuit includes current mirroring circuit 131, integrating circuit 132 and electricity
Follower circuit 133 is pressed, as shown in Figures 4 and 5, wherein：The measurement voltage VO1 is converted to survey by the current mirroring circuit 131
Electric current I7 (electric current at Fig. 3 interior joints 7) is measured, the integrating circuit 132 integrates the measurement electric current, forms integral electricity
Press Vpin7 (voltage at Fig. 3 interior joints 7), the voltage follower circuit 133 by the integral voltage Vpin7 be converted to
With voltage Vpin6 (voltage at Fig. 3 interior joints 6), and it is further converted into the driving current Iout (electricity at Fig. 3 interior joints 5
Stream), the driving current Iout drives the load indicators turn in the rotating speed display device Iw, to show rotating speed to be measured
Corresponding scale.In one embodiment, current driving circuit further comprises the second capacitance C2 of low-capacitance, and described
Rotating speed display device Iw is in parallel, and the first end of the second capacitance C2 connects the main power source VCC, the second capacitance C2's
Second end connects the output end of the voltage follower circuit 133.
Specifically, in the tachometric survey driving circuit, the current mirroring circuit 131 include the 6th triode Q6,
7th triode Q7, the 8th triode Q8 and the 9th triode Q9, the 6th triode Q6, the 7th triode Q7, the 8th triode
Q8 and the 9th triode Q9 is PNP type triode, wherein：The emitter of the 6th triode Q6 connects the source of stable pressure
The collector of VDD, the 6th triode Q6 connect the emitter of the 8th triode Q8, and the base stage of the 6th triode Q6 connects
Connect the base stage of the 7th triode Q7, the collector phase of the base stage and the 6th triode Q6 of the 6th triode Q6
Even；The emitter of the 7th triode Q7 connects the source of stable pressure VDD, the collector connection the 9th of the 7th triode Q7
The emitter of triode Q9；The collector of the 8th triode Q8 connects the monostable circuit 12, specifically connects second
The collector of triode Q2, the base stage of the 8th triode Q8 connect the base stage of the 9th triode Q9, and the described 8th 3
The base stage of pole pipe Q8 is connected with the collector of the 8th triode Q8；The collector of the 9th triode Q9 is as current mirror
The output end of circuit connects the integrating circuit 132 and voltage follower circuit 133.In other examples, current mirror electricity
Road can have different number of transistor, also can be with the structure of other forms.
Further, in the tachometric survey driving circuit, the integrating circuit 132 includes the 6th resistance R6 and the
Three capacitance C3, wherein：The first end of the 6th resistance R6 is connected to the 9th triode of current mirroring circuit output end
The collector of Q9, other end ground connection；The first end of the third capacitance C3 connects the collector of the 9th triode Q9, described
The second end of third capacitance C3 is grounded.
In addition, in the tachometric survey driving circuit, the voltage follower circuit 133 includes the second operation amplifier
Device U2, the tenth triode Q10 and driving resistance RL2, wherein：Described in the in-phase input end connection of the second operational amplifier U2
The collector of 9th triode Q9, one end of the inverting input connection driving resistance RL2 of the second operational amplifier U2, drives
Dynamic resistance RL2 other ends ground connection, the output end of the second operational amplifier U2 connect the base stage of the tenth triode Q10；
The emitter of the tenth triode Q10 connects the inverting input of the second operational amplifier U2, the tenth triode
The collector of Q10 is for providing driving current.In one embodiment, current driving circuit further comprises the second capacitance C2,
The collector of the tenth triode Q10 connects the second end of the second capacitance C2.
Tetra- 6th triode Q6, the 7th triode Q7, the 8th triode Q8 and the 9th triode Q9 PNP triodes are formed
The voltage signal of VO1 is converted into the electric current at second operational amplifier U2 in-phase input ends by current mirror.The current mirroring circuit
In, as upper tube, the conduction voltage drop between emitter and collector is all 0.7V by the 6th triode Q6 and the 7th triode Q7,
The current-mirror structure makes the ratio of conducting electric current not vary with temperature.
Electric current at second operational amplifier U2 in-phase input ends is integrated by R6 and C3, is converted into DC voltage.Due to
VO1 exports high level time 0.64RtCt, V7 ≈ V6=I7* (TW/ T) * R6=(0.64RtCt/T) * I7*R6, wherein：V7 is
Second operational amplifier U2 homophase inputs terminal voltage (voltage at Fig. 3 interior joints 7), V6 are second operational amplifier U2 output ends
Voltage (voltage at Fig. 3 interior joints 6), T are the period of Vin, TWFor the charging time, I7 is to measure electric current.Measuring electric current I7 is
For the electric current that the collector of the 9th triode Q9 flows out voltage V7 is formed for charging for capacitance C3.Driving current IOUT=V6/
RL2 can increase driving current by turning RL2 down.Driving current output ripple can be adjusted by C3 capacitances, increase C3
Capacitance, ripple reduce, otherwise increase.Voltage V7 is turned by U2 and resistance RL2 at second operational amplifier U2 in-phase input ends
The driving current of driving rotating speed display device Iw is turned to, realizes that constant current driving, load pointer display are stablized.In addition, the program is not
It is the bulky capacitor of 1000uF to need capacitance, it is preferred that the small capacitances C2 that optional capacitance is about 100nF.In another embodiment,
Also the driving current that voltage follower circuit 133 exports can be directly driven rotating speed display device Iw, without additionally selecting capacitance
C2。
In the tachometric survey driving circuit that the utility model second embodiment provides, it will be measured by current driving circuit
Voltage is converted to driving current, and the size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio, realizes
By the setting of current driving circuit driving current is obtained, without the mode of circuit external parallel connection bulky capacitor, and electricity
Most of element of stream driving circuit can be integrated in inside driving chip, the discrete component that outside only needs Connecting quantity smaller, body
Product is small, and reliability is high.
In one embodiment, by above-mentioned Schmidt trigger circuit, regulator circuit, bleeder circuit, charging current and
A part of circuit or whole circuits in holding circuit are integrated in driving circuit chip, and charging capacitor Ct may be configured as driving
Element outside circuit chip, the adjustable range for measuring voltage duty cycle of value by adjusting outer member, drives to adjust
The size of streaming current, for being applicable in different gauge outfit drivings.
In one embodiment, by above-mentioned Schmidt trigger circuit, regulator circuit, bleeder circuit, charging current, holding electricity
A part of circuit or whole circuits in road, current mirroring circuit, integrating circuit and voltage follower circuit are integrated in driving electricity
In the chip of road, the element outside drive circuit chip is may be configured as some or all of in resistance Rt, RL1 and RL2, passes through adjusting
The size of driving current is adjusted in the value of outer member, for being applicable in different gauge outfit drivings.
In one embodiment, by above-mentioned Schmidt trigger circuit, regulator circuit, bleeder circuit, charging current, holding electricity
A part of circuit or whole circuits in road, current mirroring circuit, integrating circuit and voltage follower circuit are integrated in driving electricity
In the chip of road, capacitance C3 may be configured as the element outside drive circuit chip, and the value by adjusting the outer member can be used for adjusting
The ripple size of whole driving current.
<Embodiment three>
One embodiment of the utility model provides a kind of tachometric survey driving method, including：
One tach signal is converted into a measurement voltage, wherein the frequency of the tach signal and rotating speed to be measured are at just
Ratio, the duty ratio for measuring voltage are positively correlated relationship with the rotating speed to be measured；And
The measurement voltage is converted into driving current, the driving current is used to drive load pointer to turn in a scale
It is rotated in fast display device, the size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio.
Specifically, the tachometric survey driving method may be accomplished by：It is monostable that one tach signal is provided to one
State circuit, the frequency of the tach signal and rotating speed to be measured are in direct ratio, so that monostable circuit output one measures
Voltage, the duty ratio for measuring voltage are positively correlated relationship with the rotating speed to be measured；By current driving circuit by institute
It states measurement voltage and is converted to driving current, the driving current is for driving load pointer in rotating speed display device with a scale
Rotation, the size of the driving current and the scale corresponding to rotating speed to be measured are in direct ratio.
In one embodiment, a described the step of tach signal is converted into a measurement voltage, further comprises：
The tach signal is subjected to processing and forms turnover voltage, in first half cycle, when the tach signal is by the first electricity
It is flat that the turnover voltage is transformed to the first level by second electrical level when being transformed to second electrical level, in the later half period, the rotating speed letter
When number being transformed to the first level by second electrical level, the turnover voltage is second electrical level by the first level translation；
When turnover voltage is transformed to the first level by second electrical level, charging electricity is formed with a set time pair capacitor charging
Pressure, the charging voltage feed back to the turnover voltage, so that the turnover voltage in the first half cycle except the set time, becomes
It is changed to third level；
It provides and measures voltage, wherein it is second electrical level to measure voltage within the set time, in other of a cycle
The measurement voltage is the first level in time.
Specifically, a step of tach signal is converted into a measurement voltage described in the tachometric survey driving method can
It is accomplished by the following way：The tach signal is handled by bleeder circuit, formation turnover voltage, in first half cycle,
When the tach signal is second electrical level by the first level translation, the turnover voltage is transformed to the first electricity by second electrical level
Flat, in the later half period, when the tach signal is transformed to the first level by second electrical level, the turnover voltage is become by the first level
It is changed to second electrical level, the turnover voltage inputs to charging circuit；The charging circuit is converted in turnover voltage by second electrical level
For the first level when, charged with the set time, form charging voltage, the charging voltage feeds back to the turnover voltage so that
The turnover voltage is transformed to third level in the first half cycle except the set time；By holding circuit when described fixed
The measurement voltage of interior output second electrical level exports the measurement electricity of the first level in the other times of a cycle
Pressure.
In one embodiment, the described the step of measurement voltage is converted to driving current, further comprises：
Voltage will be measured by current mirroring circuit and resistance to be converted into measuring electric current；
Integral voltage is formed to capacitor charging by the measurement electric current；And
The integral voltage is converted into the driving current by voltage follower circuit.
Specifically, the step of measurement voltage is converted to driving current described in the tachometric survey driving method can
It is accomplished by the following way：The measurement voltage is converted into measurement electric current by current mirroring circuit, by integrating circuit to institute
It states measurement electric current to be integrated, forms integral voltage, the integral voltage is converted to by the drive by voltage follower circuit
Streaming current, the driving current drives the load indicators turn in rotating speed display device, to show corresponding to rotating speed to be measured
Scale.
Further, the tachometric survey driving method may also include：The tach signal is provided to Schmidt trigger
The output end of the input terminal of circuit, the Schmitt trigger circuit connects the monostable circuit, and is touched by the Schmidt
It sends out device circuit and rectification is carried out to the tach signal.Regulator circuit is provided to the monostable circuit and the current driving circuit
Source of stable pressure, the regulator circuit couple a main power source to generate source of stable pressure.
Further, the tachometric survey driving method may also include：Monostable circuit is exported by the first capacitance
Electric current carries out shaping and drives load indicators turn in the rotating speed display device to generate driving current, to be measured to show
Scale corresponding to rotating speed.
In one embodiment, by above-mentioned Schmidt trigger circuit, regulator circuit, bleeder circuit, charging current and holding
A part of circuit or whole circuits in circuit are integrated in driving circuit chip, and charging capacitor Ct may be configured as driving circuit
The element of chip exterior, the adjustable range for measuring voltage duty cycle of value by adjusting outer member, to adjust driving electricity
The size of stream, for being applicable in different gauge outfit drivings.
In one embodiment, by above-mentioned Schmidt trigger circuit, regulator circuit, bleeder circuit, charging current, holding electricity
A part of circuit or whole circuits in road, current mirroring circuit, integrating circuit and voltage follower circuit are integrated in driving electricity
In the chip of road, the element outside drive circuit chip is may be configured as some or all of in resistance Rt, RL1 and RL2, passes through adjusting
The size of driving current is adjusted in the value of outer member, for being applicable in different gauge outfit drivings.
In one embodiment, by above-mentioned Schmidt trigger circuit, regulator circuit, bleeder circuit, charging current, holding electricity
A part of circuit or whole circuits in road, current mirroring circuit, integrating circuit and voltage follower circuit are integrated in driving electricity
In the chip of road, capacitance C3 may be configured as the element outside drive circuit chip, and the value by adjusting the outer member can be used for adjusting
The ripple size of whole driving current.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For system disclosed in embodiment
For, due to corresponding to the methods disclosed in the examples, so description is fairly simple, related place is referring to method part illustration
.
Foregoing description is only the description to the utility model preferred embodiment, not to any limit of the scope of the utility model
Calmly, any change, the modification that the those of ordinary skill in the utility model field does according to the disclosure above content, belong to right and want
Seek the protection domain of book.
Claims (10)
1. a kind of tachometric survey driving circuit, which is characterized in that the tachometric survey driving circuit includes regulator circuit, monostable
Circuit and current driving circuit, wherein：
The monostable circuit couples a tach signal, and the frequency of the tach signal and rotating speed to be measured are in direct ratio, institute
The output end for stating monostable circuit provides a measurement voltage, and the duty ratio for measuring voltage is with the rotating speed to be measured at just
Correlativity；
The current driving circuit couples the output end of the monostable circuit, and the current driving circuit couples with a scale turn
Load pointer in fast display device, the size of the driving current of the current driving circuit output and rotating speed institute to be measured are right
The scale answered is in direct ratio；
The regulator circuit couples the monostable circuit and the current driving circuit, and the regulator circuit couples a main power source
To generate source of stable pressure.
2. tachometric survey driving circuit as described in claim 1, which is characterized in that the monostable circuit includes partial pressure electricity
Road, charging circuit and holding circuit, wherein：
The bleeder circuit handles the tach signal, formation turnover voltage, in first half cycle, when the tach signal
By the first level translation be second electrical level when, the turnover voltage is transformed to the first level by second electrical level, in the later half period, institute
When stating tach signal and being transformed to the first level by second electrical level, the turnover voltage is second electrical level, institute by the first level translation
It states turnover voltage and inputs to the charging circuit；
The charging circuit is charged when turnover voltage is transformed to the first level by second electrical level with the set time, forms charging
Voltage, the charging voltage feed back to the turnover voltage, so that the turnover voltage is in the first half cycle except the set time,
It is transformed to third level；
The holding circuit exports the measurement voltage of second electrical level within the set time, in other of a cycle
The measurement voltage of the first level of interior output.
3. tachometric survey driving circuit as claimed in claim 2, which is characterized in that the bleeder circuit include first resistor,
Second resistance and the first triode, wherein：
Described first resistor one end connects the collector of first triode, the second electricity of other end connection of the first resistor
Resistance and the charging circuit, the second resistance other end connect source of stable pressure；
The base stage of first triode inputs the tach signal, the emitter ground connection of first triode.
4. tachometric survey driving circuit as claimed in claim 3, which is characterized in that the charging circuit includes emitter following
Device, the 5th triode, charging capacitor, charging resistor, the 4th capacitance, third transistor, the 4th triode, the 8th resistance and the 9th
Resistance, wherein：
The junction of input terminal the connection first resistor and second resistance of emitter follower, the output end of the emitter follower connect
Connect the first end of the charging capacitor；
The collector of 5th triode connects the input terminal of the emitter follower, the base stage connection of the 5th triode
The collector of 4th triode, the emitter ground connection of the 5th triode；
The first end of second end the connection charging resistor and the 4th capacitance of the charging capacitor, the charging resistor other end connection
Source of stable pressure, the second end ground connection of the 4th capacitance；
The base stage of the third transistor connects the second end of the charging capacitor, the collector connection of the third transistor the
Nine resistance, the emitter of the third transistor connect the base stage of the 4th triode, and the other end connection of the 9th resistance is described steady
Potential source；
The collector of 4th triode connects a first voltage by the 8th resistance, and the emitter of the 4th triode connects
Ground.
5. tachometric survey driving circuit as claimed in claim 4, which is characterized in that the holding circuit is put including the first operation
Big device, the second triode, the 4th resistance, the 5th resistance and holding resistance, wherein：
The base stage of second triode connects the collector of the third transistor, and the collector of the second triode connects electric current
Driving circuit, emitter connect the inverting input of first operational amplifier；
Described 4th resistance one end connects the in-phase input end of first operational amplifier, other end ground connection, the 5th electricity
Resistance one end connects the in-phase input end of first operational amplifier, and the other end connects the source of stable pressure；
The inverting input for keeping resistance one end to connect first operational amplifier, other end ground connection；
The output end of first operational amplifier connects the collector of the third transistor.
6. tachometric survey driving circuit as described in claim 1, which is characterized in that the current driving circuit includes current mirror
Circuit, integrating circuit and voltage follower circuit, wherein：
The measurement voltage is converted to measurement electric current by the current mirroring circuit, and the integrating circuit carries out the measurement electric current
Integral, forms integral voltage, and the integral voltage is converted to the driving current, the driving by the voltage follower circuit
Electric current drives the load indicators turn in the rotating speed display device, to show the scale corresponding to rotating speed to be measured.
7. tachometric survey driving circuit as claimed in claim 6, which is characterized in that the current mirroring circuit includes the six or three pole
Pipe, the 7th triode, the 8th triode and the 9th triode, wherein：
The emitter of 6th triode connects the source of stable pressure, and the collector of the 6th triode connects the 8th triode
Emitter, the base stage of the 6th triode connects the base stage of the 7th triode, the base stage of the 6th triode and
Collector is connected；
The emitter of 7th triode connects the source of stable pressure, and the collector of the 7th triode connects the 9th triode
Emitter；
The collector of 8th triode connects the monostable circuit, the base stage connection the described 9th of the 8th triode
The base stage of the base stage of triode, the 8th triode is connected with collector；
The collector of 9th triode connects the integrating circuit and voltage follower as the output end of current mirroring circuit
Circuit.
8. tachometric survey driving circuit as claimed in claim 6, which is characterized in that the integrating circuit include the 6th resistance and
Third capacitance, wherein：
The first end of 6th resistance connects the output end of the current mirroring circuit, other end ground connection；
The third capacitance and the 6th resistor coupled in parallel.
9. tachometric survey driving circuit as claimed in claim 8, which is characterized in that the voltage follower circuit includes second
Operational amplifier, the tenth triode and driving resistance, wherein：
The in-phase input end of the second operational amplifier connects the first end of the 6th resistance, the second operational amplifier
Inverting input connection driving resistance one end, driving the resistance other end ground connection, the output end of the second operational amplifier
Connect the base stage of the tenth triode；
The emitter of tenth triode connects the inverting input of the second operational amplifier, and collector is for providing drive
Streaming current.
10. tachometric survey driving circuit as described in claim 1, which is characterized in that the tachometric survey driving circuit also wraps
Schmitt trigger circuit is included, the tach signal is provided to the input terminal of the Schmitt trigger circuit, the Schmidt
The output end of flip-flop circuit connects the monostable circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721744741.6U CN207764249U (en) | 2017-12-14 | 2017-12-14 | Tachometric survey driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721744741.6U CN207764249U (en) | 2017-12-14 | 2017-12-14 | Tachometric survey driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207764249U true CN207764249U (en) | 2018-08-24 |
Family
ID=63186494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721744741.6U Withdrawn - After Issue CN207764249U (en) | 2017-12-14 | 2017-12-14 | Tachometric survey driving circuit |
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| CN (1) | CN207764249U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907704A (en) * | 2017-12-14 | 2018-04-13 | 杭州百隆电子有限公司 | Tachometric survey drive circuit and method |
-
2017
- 2017-12-14 CN CN201721744741.6U patent/CN207764249U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107907704A (en) * | 2017-12-14 | 2018-04-13 | 杭州百隆电子有限公司 | Tachometric survey drive circuit and method |
| CN107907704B (en) * | 2017-12-14 | 2024-02-02 | 杭州百隆电子有限公司 | Rotation speed measurement driving circuit and method |
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