CN107070100A - A kind of automobile dynamo governor phase signals sample circuit - Google Patents
A kind of automobile dynamo governor phase signals sample circuit Download PDFInfo
- Publication number
- CN107070100A CN107070100A CN201710343401.0A CN201710343401A CN107070100A CN 107070100 A CN107070100 A CN 107070100A CN 201710343401 A CN201710343401 A CN 201710343401A CN 107070100 A CN107070100 A CN 107070100A
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- Prior art keywords
- phase signals
- sample circuit
- circuit
- chip
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a kind of automobile dynamo governor phase signals sample circuit, including：Rectification circuit, the sine wave phase signals of generator unit stator winding are converted to square-wave signal by it；Sampling resistor, it is used to gather phase signals；IC chip, it connects the output end of sample circuit, and the IC chip is used to reading and handling the signal that sampling resistor is collected；On-off circuit, it is connected between the sampling resistor and the IC chip, during the on-off circuit conducting, the IC chip input low level signal；Filter capacitor, its one end is connected between on-off circuit and IC chip, other end ground connection, and the filter capacitor is used to be filtered the phase signals collected.The automobile dynamo governor phase signals sample circuit that the present invention is provided overcomes the undesirable defect of phase signals collection effect of traditional phase signals sample circuit for low frequency, low-voltage, and there is provided a kind of computational methods of reasonable selection filter capacitor, sample circuit is reached more preferable filter effect.
Description
Technical field
The invention belongs to electric instrument technical field, more particularly to a kind of automobile dynamo governor phase signals sampling electricity
Road.
Background technology
Present mainstream automotive dynamo governor can gather the signal of a phase stator winding of generator as generator
Tach signal, dynamo governor phase signals are a more crucial parameter for adjuster control.Due to traditional
Automobile dynamo governor phase signals sample circuits is believed only with the acquisition mode of partial pressure for low frequency, low-voltage
Number collection effect is very undesirable, and when low frequency, the phase signals of low-voltage are transferred to sample circuit, adjuster IC can not know completely
The signal not collected, causes adjuster to rotating speed decision error, so as to cause chip error to act.Therefore, when low frequency, low
When the phase signals of voltage are transferred to sample circuit, it is ensured that the correct processing of IC chip, and then ensure the normal of dynamo governor
Work is the problem of dynamo governor sample circuit needs solution.
Typically need that sinusoidal signal first is converted into IC chip readily identified square-wave signal during sampling circuit samples, then carry out
Sampling.Can be by convert alternating current into direct current using rectification circuit, but export DC voltage or DC current all can
With ripple.To prevent IC chip from having moire disturbance when reading signal, it is necessary to which the signal of circuit output is filtered.It is theoretical
Upper filter capacitor value is the bigger the better, but capacitance is bigger, and its volume is bigger, and cost is higher, and connects moment in circuit
Transient current can be very big, can destroy device.And if capacitance selection is too small, then can not reach preferable filter effect.Therefore,
Select suitable filter capacitor, you can avoid damaging device, interference of the ripple to signal can be effectively reduced again, to sample circuit
The accuracy of the signal collected plays vital effect.
The content of the invention
It is an object of the invention to overcome existing automobile dynamo governor phase signals sample circuit for low frequency,
The defect that the phase signals collection effect of low-voltage is undesirable can effectively gather phase signals there is provided one kind and be converted to IC identifications
Signal sample circuit.
Another object of the present invention is to overcome existing automobile dynamo governor phase signals sample circuit filter capacitor
The undesirable defect of filter effect makes there is provided a kind of computational methods of reasonable selection filter capacitor caused by selection is unreasonable
Sample circuit reaches more preferable filter effect.
The technical scheme that the present invention is provided is：
A kind of automobile dynamo governor phase signals sample circuit, including：
Rectification circuit, the sine wave phase signals of generator unit stator winding are converted to square-wave signal by it；
Sampling resistor, it is used to gather phase signals；
IC chip, it connects the output end of sample circuit, and the IC chip is used to read and handle sampling resistor to collect
Phase signals；
On-off circuit, it is connected between the sampling resistor and the IC chip, described during the on-off circuit conducting
IC chip input low level signal；
Filter capacitor, its one end is connected between on-off circuit and IC chip, and other end ground connection, the filter capacitor is used for
The phase signals collected are filtered.
Preferably, the sample circuit also includes pull-up circuit, and it is connected to IC cores by Vcc one resistance of series connection
Piece input, during pull-up circuit conducting, the IC chip inputs Vcc value, the pull-up circuit for IC chip I/O mouths oneself
Band is external.
Preferably, the rectification circuit is bridge rectifier.
Preferably, when it is higher than preset value to input phase signals, the on-off circuit conducting, when input phase signals are low
When preset value, the on-off circuit disconnects.
Preferably, the on-off circuit is a phase inverter being made up of triode.
Preferably, the capacitance of the filter capacitor is：
Wherein, power when P is sample circuit steady operation, a is ripple voltage amplitude, and f is the frequency of phase signals, and U is
Line voltage virtual value.
Preferably, the sample circuit eliminates the floating ground pressure difference of phase voltage using a resistance, and described resistance one end connects
Connect phase signals input, other end ground connection.
Preferably, connected before the sampling resistor divider resistance, its effect is to reduce high-value signal in sample circuit
To the scope of suitable sampling.
The beneficial effects of the invention are as follows：The automobile dynamo governor phase signals sample circuit that the present invention is provided, Neng Gouyou
Effect collection phase signals and the signal for being converted to IC identifications, and by calculating rational selection filter capacitor, make sample circuit
Filter effect more preferably, effectively reduces interference of the ripple to sampled signal.
Brief description of the drawings
Fig. 1 is the circuit diagram of phase signals sample circuit of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
As shown in figure 1, the invention provides a kind of automobile dynamo governor phase signals sample circuit, it can effectively be adopted
Collection low frequency, low-voltage phase signals and the signal for being converted to IC identifications；Present invention also offers a kind of reasonable selection filter capacitor
Computational methods, sample circuit is reached more preferable filter effect.The sample circuit includes rectification circuit, and it determines generator
The sine wave phase signals of sub- winding are converted to square-wave signal；The rectification circuit uses bridge rectifier, bridge rectifier
The positive and negative half cycle of input ac voltage, polarity is converted by the half period of input ac voltage, makes the DC pulse of output
The frequency of voltage is doubled than the frequency of input ac voltage and as 100Hz, the raising of this frequency is conducive to filtering
The filtering of circuit.
The rectified circuit conversion of sine wave phase signals of generator unit stator winding be square-wave signal after exported by rectification circuit
End 170 is inputted, and divider resistance 110 is connected in the output end 170 of rectification circuit, and sampling resistor 120 is gone here and there with divider resistance 110
Connection, divider resistance 110 drops to the signal of 170 inputs after certain amplitude, and the signal of 120 pairs of inputs of sampling resistor is sampled,
And sampled signal is obtained, after the filtered electric capacity 150 of sampled signal is filtered, sample circuit output end is transferred to, IC is finally delivered to
Chip 160 is handled.IC chip 160 connects the output end of sample circuit, and the IC chip is used to reading and handling sampling electricity
The phase signals that resistance 120 is collected.
On-off circuit 140, is a phase inverter being made up of triode.It is connected to the sampling resistor 120 with it is described
Between IC chip 160, when the phase signals of input sampling circuit are higher than preset value, the on-off circuit 140 is turned on, the IC
The input low level signal of chip 160；When the phase signals of input sampling circuit are less than or equal to preset value, on-off circuit 140
Disconnect, the pull-up circuit 180 is turned on, the IC chip 160 inputs Vcc value.Pull-up circuit 180 is connected one by a Vcc
Resistance is connected to the input of IC chip 160, and the pull-up circuit 180 is carried or external for the I/O mouths of IC chip 160.If IC cores
The I/O ports of piece, it is without built-in pull-up circuit, it is necessary to which external pull-up circuit, if the I/O ports of IC chip, electricity is pulled up without built-in
Road, then need external pull-up circuit.
The sample circuit uses filter capacitor 150, and its one end is connected to after the on-off circuit, other end ground connection, filter
150 pairs of ripple electric capacity is transferred to the phase signals of IC chip 160 and is filtered.IC chip 160 is according to the filtered signal of input to hair
Motor speed is adjusted.The quality of sample circuit filter effect directly affects the accuracy for the signal that IC chip is received, such as
The selection of fruit filter capacitor is too small, and ripple can produce strong interference to signal, causes IC chip to make a mistake processing, influence generator
The normal work of adjuster.It if filter capacitor selection is excessive and can cause to waste, even result in device failure in circuit.Cause
This, the capacitance of the filter capacitor in the sample circuit is calculated by formula (1)：
Wherein, power when P is sample circuit steady operation, a is ripple voltage amplitude, and f is the frequency of phase signals, and U is
Line voltage virtual value.
Ripple voltage amplitude is smaller in the sample circuit of general automobile current generator, is calculated using formula (1).But
Special circumstances are run into, when ripple voltage amplitude is larger, then need to be iterated calculating according to formula (1) and formula (2)：
Wherein, L=P/ (2 π fCn-1U2)；N=1,2,3 ...
Under Same Efficieney, if necessary to reduce ripple voltage amplitude, then need to increase the capacitance of filter capacitor.It is computed,
When ripple voltage amplitude is smaller, first time result of calculation is with second of result of calculation very close to i.e. C1≈C2, with voltage wave
Line amplitude a increase, it is necessary to iterative calculation increased frequency, but be computed find, C4, C5, C6With C3It is of substantially equal, so
Iterated to calculate 3 times in practical application, C3As required capacitance.
The sample circuit also eliminates the floating ground pressure difference of phase voltage using a resistance 130, collects sampling resistor 120
Signal it is more accurate, described one end of resistance 130 connects phase signals input, other end ground connection.
The automobile dynamo governor phase signals sample circuit that the present invention is provided, can effectively gather phase signals and be converted to
The signal of IC identifications, and by calculating rational selection filter capacitor, make the filter effect of sample circuit more preferable, effectively reduction
Interference of the ripple to sampled signal.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, the present invention is not limited
In specific details and shown here as the legend with description.
Claims (8)
1. a kind of automobile dynamo governor phase signals sample circuit, it is characterised in that including：
Rectification circuit, the sine wave phase signals of generator unit stator winding are converted to square-wave signal by it；
Sampling resistor, it is used to gather phase signals；
IC chip, it connects the output end of sample circuit, and the IC chip is used to reading and handling the phase that sampling resistor is collected
Signal；
On-off circuit, it is connected between the sampling resistor and the IC chip, during the on-off circuit conducting, the IC cores
Piece input low level signal；
Filter capacitor, its one end is connected between on-off circuit and IC chip, and other end ground connection, the filter capacitor is used for adopting
The phase signals collected are filtered.
2. automobile dynamo governor phase signals sample circuit according to claim 1, it is characterised in that also including pull-up
Circuit, it is connected to IC chip input by Vcc one resistance of series connection, during the pull-up circuit conducting, the IC chip
Vcc value is inputted, the pull-up circuit is carried or external for the I/O mouths of IC chip.
3. automobile dynamo governor phase signals sample circuit according to claim 1, it is characterised in that the rectified current
Road is bridge rectifier.
4. automobile dynamo governor phase signals sample circuit according to claim 1, it is characterised in that when input is believed
When number being higher than preset value, on-off circuit conducting, when it is less than or equal to preset value to input phase signals, the switch electricity
Road disconnects.
5. the automobile dynamo governor phase signals sample circuit according to claim 1 or 4, it is characterised in that described to open
Powered-down road is a phase inverter being made up of triode.
6. automobile dynamo governor phase signals sample circuit according to claim 1, it is characterised in that the filtered electrical
The capacitance of appearance is：
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Wherein, power when P is sample circuit steady operation, a is ripple voltage amplitude, and f is the frequency of phase signals, and U is line electricity
It is pressed with valid value.
7. automobile dynamo governor phase signals sample circuit according to claim 1, it is characterised in that using an electricity
Resistance eliminates the floating ground pressure difference of phase voltage, and described resistance one end connects phase signals input, other end ground connection.
8. automobile dynamo governor phase signals sample circuit according to claim 1, it is characterised in that the sampling electricity
Series connection divider resistance before resistance, it is that high-value signal in sample circuit is reduced to the scope for being adapted to sampling that it, which is acted on,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710343401.0A CN107070100A (en) | 2017-05-16 | 2017-05-16 | A kind of automobile dynamo governor phase signals sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710343401.0A CN107070100A (en) | 2017-05-16 | 2017-05-16 | A kind of automobile dynamo governor phase signals sample circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107070100A true CN107070100A (en) | 2017-08-18 |
Family
ID=59610996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710343401.0A Pending CN107070100A (en) | 2017-05-16 | 2017-05-16 | A kind of automobile dynamo governor phase signals sample circuit |
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| Country | Link |
|---|---|
| CN (1) | CN107070100A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110057638A1 (en) * | 2009-09-07 | 2011-03-10 | Niko Semiconductor Co., Ltd. | Pulse width modulation regulator ic and circuit thereof |
| CN102507034A (en) * | 2011-10-18 | 2012-06-20 | 广东美的电器股份有限公司 | Temperature sampling circuit and method of air conditioner |
| CN103063979A (en) * | 2013-01-04 | 2013-04-24 | 合肥市英唐科技有限公司 | Load open-circuit detection circuit |
| CN203190986U (en) * | 2013-05-02 | 2013-09-11 | 航天科技控股集团股份有限公司 | Vehicle frequency signal acquisition circuit |
| CN203499820U (en) * | 2013-09-17 | 2014-03-26 | 郑州众智科技股份有限公司 | Natural gas generating set rotating speed acquisition module |
-
2017
- 2017-05-16 CN CN201710343401.0A patent/CN107070100A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110057638A1 (en) * | 2009-09-07 | 2011-03-10 | Niko Semiconductor Co., Ltd. | Pulse width modulation regulator ic and circuit thereof |
| CN102507034A (en) * | 2011-10-18 | 2012-06-20 | 广东美的电器股份有限公司 | Temperature sampling circuit and method of air conditioner |
| CN103063979A (en) * | 2013-01-04 | 2013-04-24 | 合肥市英唐科技有限公司 | Load open-circuit detection circuit |
| CN203190986U (en) * | 2013-05-02 | 2013-09-11 | 航天科技控股集团股份有限公司 | Vehicle frequency signal acquisition circuit |
| CN203499820U (en) * | 2013-09-17 | 2014-03-26 | 郑州众智科技股份有限公司 | Natural gas generating set rotating speed acquisition module |
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