CN213041913U - Range extender separation voltage sampling circuit - Google Patents
Range extender separation voltage sampling circuit Download PDFInfo
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- CN213041913U CN213041913U CN202021915180.3U CN202021915180U CN213041913U CN 213041913 U CN213041913 U CN 213041913U CN 202021915180 U CN202021915180 U CN 202021915180U CN 213041913 U CN213041913 U CN 213041913U
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Abstract
The utility model discloses a range extender separation voltage sampling circuit relates to signal acquisition device technical field. The sampling circuit comprises a resistor R21, a resistor R22, an LM2903 type voltage comparator U9A, a resistor R39, a resistor R33, a capacitor C23, a ground, a resistor R24, a resistor R23, a capacitor C21, a resistor R35, an LM2903 type voltage comparator U9B, a resistor R26, a resistor R25, a TLP187 type optical coupler J21, a resistor R27, a resistor R28, a resistor R29, a resistor R36, a resistor R37, a capacitor C22, a diode D1 and a diode D2. This application sampling circuit turns into the duty cycle of 0~100% change with the 0~5V voltage signal of footboard signal, transmits through the switching characteristic of opto-coupler, gathers through the chip pin at last and calculates actual voltage, has circuit structure simply, and is with low costs, gathers advantages such as precision height.
Description
Technical Field
The utility model relates to a signal acquisition device technical field especially relates to an increase journey ware separation voltage sampling circuit.
Background
The traditional isolated voltage sampling scheme of the range extender generally uses an isolated power supply AD voltage acquisition chip or a low-price single chip microcomputer to carry out AD sampling, and the isolated transmission is carried out in similar modes such as serial port communication and the like, and the point position transmission is carried out through a linear isolated optical coupler. The isolation voltage acquisition circuit has the following problems: 1) the hardware cost of the AD isolation sampling modes is higher; 2) the linear optocoupler parameters are seriously influenced by temperature and need to be matched with a temperature drift compensation circuit; 3) the single chip microcomputer needs to add corresponding programs for serial port data transmission, and a program refreshing step is also needed during production, so that the production process is prolonged.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem how to provide a circuit structure is simple, and is with low costs, gathers the high journey ware separation voltage sampling circuit that increases of precision.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the utility model provides a range extender separation voltage sampling circuit which characterized in that: one input end of the sampling circuit is connected with one end of a resistor R21, the other end of the resistor R21 is divided into three paths, the first path is connected with one end of a resistor R22, the second path is connected with the non-inverting input end of an LM2903 type voltage comparator U9A, the third path is connected with one end of a resistor R39, the other end of the resistor R22 is divided into five paths, the first path is connected with the other output end of the sampling circuit, the second path is grounded through a resistor R33, the third path is grounded through a capacitor C23, the fourth path is connected with a +5V power supply through a resistor R24, the fifth path is grounded through a resistor R23, the inverting input end of the U9A is divided into three paths, the first path is grounded through a capacitor C21, the second path is connected with the output end of the LM 3 type voltage comparator U9B through a resistor R35, the output end of the U9A is divided into two paths, the first path is connected with the +5V power supply through a resistor R26, and the second path is connected with, the non-inverting input end of the U9B is divided into three paths, the first path is connected with a +5V power supply through a resistor R27, the second path is grounded through a resistor R28, the third path is connected with the output end of the U9B through a resistor R29, the inverting input end of the U9B is connected with the output end of the U9B through a resistor R35, and the output end of the U9B is connected with the +5V power supply through a resistor R36; the collector of the photosensitive triode of J21 is connected with the +5V power supply, the emitter of the photosensitive triode of J21 is divided into three paths, the first path is connected with the other end of a resistor R39, the second path is grounded through a resistor R37, the third path is connected with one end of a resistor R38, the other end of the resistor R38 is divided into four paths, the first path is grounded through a capacitor C22, the second path is grounded through a diode D1, the third path is connected with the +5V power supply through a diode D2, and the fourth path is the signal output end of the voltage sampling circuit.
The further technical scheme is as follows: and two signal input ends of the sampling circuit are respectively connected with two signal output ends of an accelerator pedal of the range extender.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: this application sampling circuit turns into the duty cycle of 0~100% change with the 0~5V voltage signal of footboard signal, transmits through the switching characteristic of opto-coupler, gathers through the chip pin at last and calculates actual voltage, has circuit structure simply, and is with low costs, gathers advantages such as precision height.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic circuit diagram of a sampling circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a triangular wave oscillator circuit according to an embodiment of the present invention;
fig. 3 is a simulated waveform diagram of a triangular wave oscillating circuit according to an embodiment of the present invention;
FIG. 4 is a simulation waveform diagram for converting voltage signal into PWM according to an embodiment of the present invention
Fig. 5 is a schematic circuit diagram of a static bias voltage according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a PWM output according to an embodiment of the present invention;
fig. 7 is a simulated waveform diagram of the PWM output according to an embodiment of the present invention;
fig. 8 is a schematic circuit diagram of optical coupling isolation transmission according to an embodiment of the present invention;
fig. 9 is a waveform diagram output in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, an embodiment of the present invention discloses a range extender separation voltage sampling circuit, an input end of the sampling circuit is connected to one end of a resistor R21, the other end of the resistor R21 is divided into three paths, the first path is connected to one end of a resistor R22, the second path is connected to a non-inverting input end of an LM2903 type voltage comparator U9A, the third path is connected to one end of a resistor R39, the other end of the resistor R22 is divided into five paths, the first path is connected to another output end of the sampling circuit, the second path is grounded via a resistor R33, the third path is grounded via a capacitor C23, the fourth path is connected to a +5V power supply via a resistor R24, the fifth path is grounded via a resistor R23, the inverting input end of the U9A is divided into three paths, the first path is grounded via a capacitor C21, the second path is connected to an output end of an LM2903 type voltage comparator U9B via a resistor R35, the output end of the U9A is divided into two paths, the first path, the second path is connected with the anode of a light emitting diode of a TLP187 type optocoupler J21 through a resistor R25, the non-inverting input terminal of the U9B is divided into three paths, the first path is connected with a +5V power supply through a resistor R27, the second path is grounded through a resistor R28, the third path is connected with the output terminal of the U9B through a resistor R29, the inverting input terminal of the U9B is connected with the output terminal of the U9B through a resistor R35, and the output terminal of the U9B is connected with a +5V power supply through a resistor R36; the collector of the photosensitive triode of J21 is connected with the +5V power supply, the emitter of the photosensitive triode of J21 is divided into three paths, the first path is connected with the other end of a resistor R39, the second path is grounded through a resistor R37, the third path is connected with one end of a resistor R38, the other end of the resistor R38 is divided into four paths, the first path is grounded through a capacitor C22, the second path is grounded through a diode D1, the third path is connected with the +5V power supply through a diode D2, and the fourth path is the signal output end of the voltage sampling circuit.
This application sampling circuit turns into the duty cycle of 0~100% change with the 0~5V voltage signal of footboard signal, transmits through the switching characteristic of opto-coupler, gathers through the chip pin at last and calculates actual voltage, has circuit structure simply, and is with low costs, gathers advantages such as precision height.
The present application describes the above circuit with reference to the following details:
building a triangular wave oscillating circuit:
as shown in fig. 2, a triangular wave oscillating loop is built by a resistor, a capacitor and a voltage comparator, and the circuit principle is as follows:
when the capacitor voltage at the point a is less than the point C, the point B is at a high level, the capacitor C21 is charged through the resistor R1, the potential at the point C is at a value of (R29// R27)/(R29// R27) + R28) × 5 ═ 3V by calculating the voltage at the point C after the resistor R29 is connected in parallel with the resistor R27 and then connected in series with the resistor R28, when the capacitor is charged so that the potential at the point a is less than the voltage at the point C3V, the point B outputs a low level so that the potential at the point C is changed, and when the voltage at the point a is less than 2V by calculating the voltage at the point C ═ R27/(R29// R28+ R27) × 5V, the capacitor is discharged through the resistor R35 to the point B, and when the capacitor discharge voltage is.
Calculating the oscillation frequency:
a capacitor charging and discharging formula: vc ═ E (1-E ^ - (t/tau))
Charging time constant τ ═ R ═ C ═ 100K ═ 1E-6 ═ 0.1s
Elementary charge E-1.6E-19
The time when the capacitor is charged to 2V and 3V is respectively calculated through a formula, the time difference is the time of oscillation for half a period, then the oscillation period T is obtained by multiplying 2, and due to the complex calculation, the oscillation frequency is directly obtained through software simulation and is about 80ms approximately.
Simulation waveform:
as shown in fig. 3, the triangular wave is the waveform of point a in fig. 2, the square wave with small amplitude is the waveform of point B, the square wave with large amplitude is the waveform of point C, and the parameter configuration description is as follows: the proportion of the resistor R29, the resistor R28 and the resistor R27 determines the upper peak value and the lower peak value of the triangular wave, the product of the resistor R35 and the capacitor C21 determines the oscillation frequency, the upper range and the lower range of the triangular wave cannot be set too wide, and the waveform is influenced by capacitance components, so that the nonlinear distortion is serious.
Conversion of TPS (throttle valve) voltage signal into PWM
The transformation mode is as follows: a comparator is used for comparing a triangular wave and a TPS signal, a PWM signal with a duty ratio of 0-100% is output, the triangular wave is a waveform with an amplitude of 1V, a proper static working point and a proper voltage division loop need to be set, the TPS signal with the voltage of 0-5V is quantized to a range of 2-3V to work, and the conversion mode is shown in figure 4.
Static bias voltage setting:
as shown in FIG. 5, the negative pole of the TPS signal is biased to 2V through a resistor R23 and a resistor R24, the positive pole of the TPS signal is reduced to 1/5 through a resistor R22 and a resistor R21, finally, the TPS voltage value is quantized to 2-3V from 0V to 5V, and the capacitor C23 stabilizes the voltage of the static operating point.
PWM output:
as shown in FIGS. 6 and 7, the comparator continuously compares the TPS signal of 2-3V with the triangular wave of 2-3V, and outputs the PWM wave of 0-5V.
PWM waveform conversion:
as shown in fig. 8, the PWM signals output by the above circuits are isolated and transmitted by the optocoupler and then collected by the chip pin for calculation, so that the RC low-pass filter circuit is not used because the cut-off characteristic of the capacitor is relatively slow, and in order to avoid the influence of temperature drift, the frequency setting of the PWM wave is very low (cycle 80ms), and if the RC low-pass filter is used, the stable voltage after filtering is ensured, and at the same time, the fast response speed cannot be achieved. Therefore, the final scheme is to directly acquire through chip pins and calculate the corresponding TPS value.
As shown in fig. 9, the acquisition of PWM waves is performed in a PWM duty of 62.5us, the PWM period is counted N, the PWM high level is counted N1, the TPS value is calculated once per rising edge, and the TPS voltage is equal to:
Vtps＝5V*N1/N；
the voltage calculation error is:
1/(80/0.0625)＝0.00078V；
the TPS signal is refreshed once for 80ms, so that the TPS signal is smooth, accurate and free of response speed.
Claims (2)
1. The utility model provides a range extender separation voltage sampling circuit which characterized in that: one input end of the sampling circuit is connected with one end of a resistor R21, the other end of the resistor R21 is divided into three paths, the first path is connected with one end of a resistor R22, the second path is connected with the non-inverting input end of an LM2903 type voltage comparator U9A, the third path is connected with one end of a resistor R39, the other end of the resistor R22 is divided into five paths, the first path is connected with the other output end of the sampling circuit, the second path is grounded through a resistor R33, the third path is grounded through a capacitor C23, the fourth path is connected with a +5V power supply through a resistor R24, the fifth path is grounded through a resistor R23, the inverting input end of the U9A is divided into three paths, the first path is grounded through a capacitor C21, the second path is connected with the output end of the LM 3 type voltage comparator U9B through a resistor R35, the output end of the U9A is divided into two paths, the first path is connected with the +5V power supply through a resistor R26, and the second path is connected with, the non-inverting input end of the U9B is divided into three paths, the first path is connected with a +5V power supply through a resistor R27, the second path is grounded through a resistor R28, the third path is connected with the output end of the U9B through a resistor R29, the inverting input end of the U9B is connected with the output end of the U9B through a resistor R35, and the output end of the U9B is connected with the +5V power supply through a resistor R36; the collector of the photosensitive triode of J21 is connected with the +5V power supply, the emitter of the photosensitive triode of J21 is divided into three paths, the first path is connected with the other end of a resistor R39, the second path is grounded through a resistor R37, the third path is connected with one end of a resistor R38, the other end of the resistor R38 is divided into four paths, the first path is grounded through a capacitor C22, the second path is grounded through a diode D1, the third path is connected with the +5V power supply through a diode D2, and the fourth path is the signal output end of the voltage sampling circuit.
2. The range extender split voltage sampling circuit of claim 1, wherein: and two signal input ends of the sampling circuit are respectively connected with two signal output ends of an accelerator pedal of the range extender.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021915180.3U CN213041913U (en) | 2020-09-04 | 2020-09-04 | Range extender separation voltage sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021915180.3U CN213041913U (en) | 2020-09-04 | 2020-09-04 | Range extender separation voltage sampling circuit |
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| CN213041913U true CN213041913U (en) | 2021-04-23 |
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| CN202021915180.3U Active CN213041913U (en) | 2020-09-04 | 2020-09-04 | Range extender separation voltage sampling circuit |
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