CN213210281U - Voltage sampling circuit, driving motor controller and vehicle - Google Patents
Voltage sampling circuit, driving motor controller and vehicle Download PDFInfo
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- CN213210281U CN213210281U CN202021699052.XU CN202021699052U CN213210281U CN 213210281 U CN213210281 U CN 213210281U CN 202021699052 U CN202021699052 U CN 202021699052U CN 213210281 U CN213210281 U CN 213210281U
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Abstract
The embodiment of the utility model provides a voltage sampling circuit, driving motor controller and vehicle, wherein, voltage sampling circuit, include: the device comprises a processing module, a power supply module, a compensation detection module and a sampling module, wherein the power supply module is electrically connected with the processing module and is used for inputting analog-to-digital conversion reference voltage to the processing module; the compensation detection module is electrically connected with the power supply module and used for acquiring reference voltage and generating limited voltage according to the reference voltage; the processing module is electrically connected with the compensation detection module and used for receiving the limited voltage and obtaining a compensation signal according to the limited voltage and the reference voltage; the sampling module is used for generating sampling voltage, and the processing module performs analog-to-digital conversion on the sampling voltage according to the reference voltage to obtain a first sampling signal so as to obtain a value of the target voltage. Through the technical scheme of the utility model, realize sampling voltage's self-adaptation calibration, can obtain the sample value of higher accuracy under the condition of cancellation voltage chip or cancellation passageway calibration step.
Description
Technical Field
The utility model relates to a voltage sampling field especially relates to a voltage sampling circuit, a driving motor controller and a vehicle.
Background
For a high-voltage power distribution module, bus voltage needs to be sampled to obtain sampled voltage, the sampled voltage of an analog signal is input into a single chip microcomputer to be converted into a digital signal by an analog-to-digital converter of the single chip microcomputer, then the digital signal is converted into bus voltage physical quantity through a certain proportional relation, and if the reference voltage of the analog-to-digital converter is inaccurate, the bus voltage sampling generates large errors.
In the related art, a voltage chip with high output precision is adopted in a sampling circuit to provide reference voltage so as to reduce sampling errors.
In addition, sampling errors can be reduced by calibrating a sampling channel and storing calibrated parameters in an EEPROM (electrically erasable programmable read-only memory), and each item needs to be calibrated on a rack once in the scheme, so that the calibration process is complicated, and a single chip microcomputer is required to keep high consistency.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve provides a voltage sampling circuit, compensates sampling voltage through the reference voltage according to actual input, realizes sampling voltage's self-adaptation calibration, can obtain the sample value of higher accuracy under the condition of cancellation voltage chip or cancellation passageway calibration step.
In order to solve the above problem, an embodiment of the first aspect of the present invention provides a voltage sampling circuit, including: a processing module, a power supply module, a compensation detection module and a sampling module, wherein,
the power supply module is electrically connected with the processing module and is used for inputting analog-to-digital converted reference voltage to the processing module;
the compensation detection module is electrically connected with the power supply module and used for acquiring the reference voltage and generating a limited voltage according to the reference voltage;
the processing module is electrically connected with the compensation detection module and is used for receiving the limited voltage and obtaining a compensation signal according to the limited voltage and the reference voltage;
the sampling module is electrically connected with the processing module and used for generating sampling voltage according to the acquired target voltage, the processing module is also used for receiving the sampling voltage and carrying out analog-to-digital conversion on the sampling voltage according to the reference voltage to obtain a first sampling signal, and the compensation signal is used for compensating the first sampling signal to obtain the value of the target voltage.
Optionally, the compensation detecting module comprises a current limiting resistor and a first voltage regulating circuit, wherein,
one end of the current limiting resistor is connected to the power supply module, and the other end of the current limiting resistor is connected to the first voltage stabilizing circuit;
the first voltage stabilizing circuit is used for stabilizing the divided reference voltage at a limited voltage value so as to output the limited voltage.
Optionally, the first regulator circuit comprises a controllable precision regulated supply filter resistor, wherein,
the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source and the reference electrode of the controllable precise voltage-stabilizing source are arranged in a common-pole mode and form a voltage dividing point, and the other end of the current-limiting resistor is connected to the voltage dividing point.
Optionally, the compensation detection module further includes an RC filter circuit, and the RC filter circuit includes:
one end of the filter resistor is connected to the voltage division point, and the other end of the filter resistor is connected to the processing module so as to output the limited voltage to the processing module;
one end of the filter capacitor is grounded, the other end of the filter capacitor is connected to the other end of the filter resistor, and the filter capacitor is used for filtering the jitter signals in the limited voltage.
Optionally, the compensation detecting module includes a voltage regulator tube, a regulating tube and a bias current resistor, wherein,
the anode of the voltage stabilizing tube is grounded, and the cathode of the voltage stabilizing tube is connected to the base electrode of the adjusting tube;
one end of the bias resistor is electrically connected with a collector electrode of the adjusting tube, the collector electrode of the adjusting tube is connected to the power supply module, and the other end of the bias resistor is connected to a cathode of the voltage stabilizing tube;
the emitter of the tuning tube is connected to the processing module to output the defined voltage to the processing module.
Optionally, the processing module comprises a reference voltage pin and a power supply pin,
the power supply module is connected to the reference voltage pin;
the power supply module is connected to the power supply pin to supply power to the processing module.
Optionally, the power supply module includes a power supply and a second voltage stabilizing circuit electrically connected to each other, and the second voltage stabilizing circuit is configured to generate the reference voltage according to a voltage received from the power supply.
Optionally, the second voltage stabilizing circuit includes a voltage stabilizing chip.
Optionally, the processing module is further configured to: converting the limit voltage into a second sampling signal according to the reference voltage, and generating the compensation signal according to a difference between the second sampling signal and a reference signal,
wherein the reference signal is generated according to a reference value of the reference voltage.
Optionally, the processing module comprises a first sampling path and a second sampling path, the first sampling path is connected to the sampling module to generate the first sampling signal, and the second sampling path is connected to the compensation detection module to generate the second sampling signal.
An embodiment of the second aspect of the present invention provides a driving motor controller, including: the voltage sampling circuit of any embodiment of the first aspect of the present invention.
An embodiment of the third aspect of the present invention provides a vehicle, including: a drive motor controller according to an embodiment of the second aspect of the present invention.
The embodiment of the utility model provides a voltage sampling circuit who has compensation detection module through the setting, compensation detection module is used for exporting a more invariable limit voltage, in-process to limit voltage carries out analog-to-digital conversion, can confirm the offset that digital signal after the analog-to-digital conversion that obtains according to current reference voltage compares with the benchmark value, and then the digital signal after the analog-to-digital conversion that needs carry out the compensation signal that compensates under obtaining this reference voltage based on the offset, in order when receiving sampling module's sampling voltage, after carrying out analog-to-digital conversion with sampling voltage and generating first sampling signal, adopt the compensation signal to compensate first sampling signal, in order through carrying out appropriate conversion with the first sampling signal after compensating, obtain the value with the target voltage that sampling voltage corresponds.
On the one hand, different compensation signals can be obtained according to different reference voltage values, so that even if the input reference voltage is influenced by temperature to cause fluctuation, the obtained compensation signals can also eliminate the influence of the fluctuation, thereby realizing the self-adaptive compensation function.
Drawings
Fig. 1 is a schematic structural diagram of a voltage sampling circuit according to the present invention;
fig. 2 is a schematic structural diagram of another voltage sampling circuit according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of the compensation detection module of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:
the device comprises a processing module 10, a power supply module 20, a compensation detection module 30, a sampling module 40, a power supply 202, a voltage stabilizing chip 204 and a controllable precise voltage stabilizing source 302.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Referring to fig. 1, a schematic block diagram of an embodiment of the present invention is shown, wherein the voltage sampling circuit includes a processing module 10, a power supply module 20, a compensation detection module 30, and a sampling module 40.
The power supply module 20 is electrically connected with the processing module 10, the compensation detection module 30 is electrically connected with the power supply module 20 and the processing module 10, respectively, and the sampling module 40 is electrically connected with the processing module 10.
The power supply module 20 is used for inputting the analog-to-digital converted reference voltage to the processing module 10.
The power supply module 20 is a module capable of outputting a reference voltage value with a specified value, and the reference voltage outputted by the module can allow a large error to exist so as to be compensated by a correspondingly generated compensation signal.
The processing module 10 may specifically be a processing chip, where the processing chip has an analog-to-digital converter, the analog-to-digital converter is configured to convert a received analog signal into a digital signal to facilitate internal processing, and the processing chip may further include a digital-to-analog converter, so as to convert the processed digital signal into an analog signal for output.
In addition, the processing chip is provided with a reference voltage pin, and a reference voltage of an ADC (analog-to-digital conversion) can be understood as a reference analog quantity as a standard of analog-to-digital conversion, and a relatively common reference standard is the maximum convertible signal size, so that selection of the reference voltage affects the accuracy of ADC conversion, thereby affecting reading of the sampling voltage, and therefore, an effect caused by an error of the reference voltage needs to be eliminated in a signal compensation manner.
The compensation detecting module 30 obtains the reference voltage output by the power supply module 20 and generates a limit voltage according to the reference voltage.
The processing module 10 is electrically connected to the compensation detecting module 30, and is configured to receive the limit voltage and obtain a compensation signal according to the limit voltage and the reference voltage.
The power supply module 20 may be understood as a voltage stabilizing circuit capable of outputting a constant voltage value, where the output constant voltage value is a limited voltage, and the compensation strategy is determined by detecting an influence of a reference voltage on reading of the limited voltage value, and generating a compensation signal to implement a compensation function.
The sampling module 40 is electrically connected to the processing module 10, and is configured to generate a sampling voltage according to the acquired target voltage, the processing module 10 is further configured to receive the sampling voltage, perform analog-to-digital conversion on the sampling voltage according to a reference voltage to obtain a first sampling signal, and the compensation signal is configured to compensate the first sampling signal to obtain a value of the target voltage.
The first sampling signal generated by analog-to-digital conversion of the sampling voltage is easy to generate a large conversion error due to deviation of a reference voltage under the condition of no compensation signal, and is easy to generate a large deviation with an actual target voltage value when the first sampling signal is converted into an analog value of the target voltage corresponding to the sampling voltage.
In this embodiment, by providing the voltage sampling circuit with the compensation detection module 30, the compensation detection module 30 is configured to output a relatively constant limited voltage, and in the process of performing analog-to-digital conversion on the limited voltage, an offset of an analog-to-digital converted digital signal obtained according to a current reference voltage compared with a reference value can be determined, and then a compensation signal that needs to be compensated for the analog-to-digital converted digital signal under the reference voltage is obtained based on the offset, so that when the sampling voltage of the sampling module 40 is received, after the sampling voltage is subjected to analog-to-digital conversion to generate a first sampling signal, the first sampling signal is compensated by using the compensation signal, and a value of a target voltage corresponding to the sampling voltage is obtained by appropriately converting the compensated first sampling signal.
On the one hand, different compensation signals can be obtained according to different reference voltage values, so that even if the input reference voltage is influenced by temperature to cause fluctuation, the obtained compensation signals can also eliminate the influence of the fluctuation, thereby realizing the self-adaptive compensation function, on the other hand, a power supply module 20 in the voltage sampling circuit can use a common power supply circuit with poor precision, the preparation cost can be reduced compared with a voltage chip, and the reliability is higher.
In addition, the voltage sampling circuit may further include a memory, which may store computer instructions, and the processing module 10 may implement the compensation strategy described above by invoking the computer instructions.
Optionally, in the embodiments of the present application, the memory may be a volatile memory or a nonvolatile memory, or may include both a volatile memory and a nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (Electrically EPROM,
EEPROM) or flash memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM).
Referring to fig. 3, optionally, in an implementation, the compensation detecting module 30 includes a current limiting resistor R1 and a first voltage stabilizing circuit, one end of the current limiting resistor R1 is connected to the power supply module 20, and the other end of the current limiting resistor R1 is connected to the first voltage stabilizing circuit. The first voltage stabilizing circuit is used for stabilizing the divided reference voltage at a limited voltage value so as to output a limited voltage.
On one hand, the current limiting resistor limits the current passing through the first voltage stabilizing circuit, and on the other hand, the current limiting resistor can also divide the input reference voltage, so that the compensation detecting module 30 outputs a stable limited voltage.
In this embodiment, by providing the current limiting resistor R1 and the first voltage stabilizing circuit electrically connected to each other, the reference voltage output by the power supply module 20 is divided and limited by the current limiting resistor R1, the limited current signal passes through the first voltage stabilizing circuit to output a relatively constant limit voltage, and the limit voltage is input to the processing module 10, so as to measure whether there is a deviation in the reference voltage by reading the limit voltage by the analog-to-digital converter in the processing module 10, and generate a corresponding compensation signal when there is a deviation, thereby implementing compensation when there is a deviation in the reference voltage.
Optionally, in one implementation, the first regulation circuit includes a controllable precision regulator 302. The anode of the controllable precise voltage-stabilizing source 302 is grounded, the cathode of the controllable precise voltage-stabilizing source 302 and the reference electrode of the controllable precise voltage-stabilizing source 302 are arranged in a common-pole mode and form a voltage-dividing point, and the other end of the current-limiting resistor R1 and one end of the filter resistor R2 are connected to the voltage-dividing point.
In this embodiment, as a specific configuration, a controllable precision voltage regulator 302 is used as a voltage regulator device,
specifically, the controllable precise voltage regulator 302 is a commonly used precise reference voltage source IC, and the basic purpose of the controllable precise voltage regulator 302 in the circuit is voltage regulation, and compared with a voltage regulator tube, the limited voltage generated by the controllable precise voltage regulator 302 has higher precision and temperature stability.
In addition, the limited voltage generated by the controllable precise voltage regulator 302 can be adjusted in voltage value by means of two external resistors, so that the first voltage regulator circuit prepared by the controllable precise voltage regulator 302 can output a constant limited voltage to generate a compensation signal based on the limited voltage and the reference voltage.
Optionally, in an implementation manner, the compensation detection module further includes an RC filter circuit, and the RC filter circuit includes: one end of the filter resistor R2 is connected to the voltage dividing point, and the other end of the filter resistor R2 is connected to the processing module so as to output a limited voltage to the processing module; and one end of the filter capacitor C is grounded, the other end of the filter capacitor C is connected to the other end of the filter resistor R2, and the filter capacitor C is used for filtering jitter signals in the limited voltage.
In this embodiment, the filter resistor R2 and the filter capacitor C are further disposed to filter out the jitter signal in the limit voltage, so that the limit voltage output by the compensation detection module 30 is more stable.
Optionally, in an implementation manner, the compensation detection module 30 includes a voltage regulator tube, an adjustment tube, and a bias resistor, wherein an anode of the voltage regulator tube is grounded, and a cathode of the voltage regulator tube is connected to a base of the adjustment tube; one end of the bias resistor is electrically connected with the collector electrode of the adjusting tube, the collector electrode of the adjusting tube is connected to the power supply module 20, and the other end of the bias resistor is connected to the cathode of the voltage stabilizing tube; the emitter of the tuning tube is connected to the processing module 10 to output a defined voltage to the processing module 10.
In the embodiment, the regulator tube, the adjusting tube and the bias resistor form a series voltage stabilizing circuit, the adjusting tube plays a role in voltage adjustment in a circuit, so the regulator tube, the regulator tube and the bias resistor form a silicon regulator tube voltage stabilizing circuit to provide a stable voltage for a base electrode of the adjusting tube, and the voltage of the adjusting tube is correspondingly adjusted under the condition of the change of the input reference voltage, so that the output limited voltage is in a constant state.
Optionally, in an implementation, the processing module 10 includes a reference voltage pin and a power supply pin, and the power supply module 20 is connected to the reference voltage pin; the power supply module 20 is connected to a power pin to supply power to the processing module 10.
In this embodiment, the power supply module 20 supplies power to the processing module 10 while supplying the reference voltage to the processing module 10 to ensure that the processing module 10 operates normally.
Referring to fig. 2, optionally, in one implementation, the power supply module 20 includes a power supply 202 and a second regulator circuit electrically connected to the power supply 202, the second regulator circuit being configured to generate a reference voltage according to a voltage received from the power supply 202.
In a preferred embodiment, the second regulator circuit includes a regulator chip 204.
In this embodiment, the power supply module 20 includes the power supply 202 and the second voltage stabilizing circuit, the second voltage stabilizing circuit may be a circuit with lower output precision, and compared with a voltage chip with high output precision, the manufacturing and cost can be reduced, in addition, even if the reference voltage output by the power supply module 20 has a jitter phenomenon, the reference voltage can still be compensated by generating an adaptive compensation signal, and once the voltage chip is abnormal, the detection precision of the sampling voltage is greatly affected.
Optionally, in an implementation, the processing module 10 is further configured to: the limited voltage is subjected to analog-to-digital conversion according to a reference voltage to generate a second sampling signal, and a compensation signal is generated according to a difference value between the second sampling signal and a reference signal, wherein the reference signal is generated according to a reference value of the reference voltage.
In this embodiment, the read value of the digital signal of the limit voltage is determined according to a reference value (for example, 5V) of the reference voltage and is used as a reference signal, if the reference voltage actually output by the power supply module 20 is deviated from the reference value, the read value of the limit voltage, that is, the deviation between the second sampling signal and the reference signal is also existed, the deviation value between the second sampling signal and the reference signal can be used as a compensation signal, and the compensation when the sampling voltage output by the sampling module 40 is read is realized.
Optionally, the processing module 10 includes a first sampling path and a second sampling path, the first sampling path being connected to the sampling module 40 to generate the first sampling signal, and the second sampling path being connected to the compensation detection module 30 to generate the second sampling signal.
Referring to fig. 2, as a specific embodiment, the voltage sampling module 40 includes a processing module 10, a power supply module 20, a compensation detection module 30, and a sampling module 40.
The processing module 10 may be a single chip microcomputer.
The power supply module 20 comprises a power supply 202 capable of outputting 7V to 60V and a voltage stabilizing chip 204 capable of outputting 5 ± 0.2V in a voltage stabilizing manner, wherein the voltage stabilizing chip 204 converts the voltage of the power supply 202 into a reference voltage of 5 ± 0.2V.
The compensation detection module 30 is a voltage regulator circuit that can use the first one described above, including the controllable precision voltage regulator 302, to be able to output a constant limited voltage of 2.5V.
The sampling module 40 is used for collecting the bus voltage as a target voltage and obtaining a sampling voltage according to the sampling proportion of the sampling module 40.
In addition, the processing module 10 includes a first sampling path connected to the sampling module 40 to generate a first sampled signal and a second sampling path connected to the compensation detection module 30 to generate a second sampled signal.
The limited voltage output by the controllable precise voltage-stabilizing source 302 is sampled by calculating a second sampling path to obtain a second sampling signal, the second sampling signal is compared with a reference signal obtained when the reference voltage is 5V, the difference value between the two digital signals is used as a compensation signal, after the sampling module 40 reads the first sampling signal of the sampling voltage through the first sampling channel, the first sampling signal is compensated according to the compensation signal, and then the first sampling signal is converted into an analog signal, so that the bus voltage with higher precision is obtained.
Specifically, the analog quantity of the bus voltage input to the sampling module 40 is 0-1670V, and the proportion of the sampling module 40 is 0.003, that is, if the sampling voltage is 0.1V, the corresponding analog quantity of the bus voltage input by the application is 33.33V; when the value of the actually input reference voltage is not 5V, for example, when the value of the actually input reference voltage is 5.1V, when the value of the actually input bus voltage is 800V, the detected bus voltage value obtained after the single chip microcomputer performs analog-to-digital and digital-to-analog conversion is about 767V, and there is a 33V deviation with 800V.
The utility model discloses a voltage sampling circuit through increasing compensation detection module 30, combines the compensation strategy that the singlechip was carried out, can reduce the deviation to 5V's within range.
As shown in fig. 2, the input end of the compensation detection module 30 including the controllable precise voltage regulator 302 simultaneously receives the reference voltage output by the voltage regulator chip 204, the output end of the compensation detection module 30 outputs a constant limited voltage Va of 2.5V, and the single chip microcomputer samples the limited voltage Va, that is, performs analog-to-digital conversion to obtain a second sampling signal in a digital form.
As shown in fig. 3, if the reference voltage Vb is exactly the reference value, i.e., 5V, the 12-bit ADC sample value defining the voltage Va is 2048, and 2048 is taken as the reference signal.
If the reference voltage Vb > 5V and the value of the second sampled signal is a, the offset value Voffset of the ADC offset signal is (2048-a), which is a positive value.
If the reference voltage Vb < 5V and the second sampled signal is read to have a value, then the offset value Voffset of the ADC offset signal is (2048-a), which is a negative value.
That is, if the value of the reference voltage is greater than the reference value, the value of the first sampling signal corresponding to the sampling voltage decreases, and if the value of the reference voltage is less than the reference value, the value of the first sampling signal corresponding to the sampling voltage increases. Through the utility model discloses the voltage sampling circuit who prescribes a limit to can generate self-adaptation's compensation signal according to the reference voltage's that leads to value, when the singlechip has a plurality of sampling channel, can carry out calibration compensation to a plurality of sampling channel.
The value of the first sampling signal after analog-to-digital conversion is Vin, and the value of the compensated first sampling signal is Vout, which is Vin + Voffset.
And converting the Vout by adopting a preset proportional relation to obtain an actual analog quantity of the bus voltage.
According to the utility model discloses a driving motor controller embodiment, include: the voltage sampling module of any of the above embodiments.
According to the utility model discloses a vehicle embodiment, include: the drive motor controller of the above embodiment.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention.
In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (12)
1. A voltage sampling circuit, comprising: a processing module, a power supply module, a compensation detection module and a sampling module, wherein,
the power supply module is electrically connected with the processing module and is used for inputting analog-to-digital converted reference voltage to the processing module;
the compensation detection module is electrically connected with the power supply module and used for acquiring the reference voltage and generating a limited voltage according to the reference voltage;
the processing module is electrically connected with the compensation detection module and is used for receiving the limited voltage and obtaining a compensation signal according to the limited voltage and the reference voltage;
the sampling module is electrically connected with the processing module and used for generating sampling voltage according to the acquired target voltage, the processing module is also used for receiving the sampling voltage and carrying out analog-to-digital conversion on the sampling voltage according to the reference voltage to obtain a first sampling signal, and the compensation signal is used for compensating the first sampling signal to obtain the value of the target voltage.
2. The voltage sampling circuit of claim 1, wherein the compensation detection module comprises a current limiting resistor and a first voltage regulator circuit, wherein,
one end of the current limiting resistor is connected to the power supply module, and the other end of the current limiting resistor is connected to the first voltage stabilizing circuit;
the first voltage stabilizing circuit is used for stabilizing the divided reference voltage at a limited voltage value to obtain the limited voltage.
3. The voltage sampling circuit of claim 2, wherein the first regulation circuit comprises a controllable precision regulated voltage source, wherein,
the anode of the controllable precise voltage-stabilizing source is grounded, the cathode of the controllable precise voltage-stabilizing source and the reference electrode of the controllable precise voltage-stabilizing source are arranged in a common-pole mode and form a voltage dividing point, and the other end of the current-limiting resistor is connected to the voltage dividing point.
4. The voltage sampling circuit of claim 3, wherein the compensation detection module further comprises an RC filter circuit comprising:
one end of the filter resistor is connected to the voltage division point, and the other end of the filter resistor is connected to the processing module so as to output the limited voltage to the processing module;
one end of the filter capacitor is grounded, the other end of the filter capacitor is connected to the other end of the filter resistor, and the filter capacitor is used for filtering the jitter signals in the limited voltage.
5. The voltage sampling circuit of claim 1, wherein the compensation detection module comprises a voltage regulator tube, a regulator tube, and a bias current resistor, wherein,
the anode of the voltage stabilizing tube is grounded, and the cathode of the voltage stabilizing tube is connected to the base electrode of the adjusting tube;
one end of the bias resistor is electrically connected with a collector electrode of the adjusting tube, the collector electrode of the adjusting tube is connected to the power supply module, and the other end of the bias resistor is connected to a cathode of the voltage stabilizing tube;
the emitter of the tuning tube is connected to the processing module to output the defined voltage to the processing module.
6. The voltage sampling circuit of claim 1, wherein the processing module comprises a reference voltage pin and a power supply pin,
the power supply module is connected to the reference voltage pin;
the power supply module is connected to the power supply pin to supply power to the processing module.
7. The voltage sampling circuit according to any one of claims 1 to 6, wherein the power supply module comprises a power supply and a second voltage regulator circuit electrically connected, the second voltage regulator circuit being configured to generate the reference voltage according to a voltage received from the power supply.
8. The voltage sampling circuit of claim 7,
the second voltage stabilizing circuit comprises a voltage stabilizing chip.
9. The voltage sampling circuit of any one of claims 1 to 6,
the processing module is further configured to: performing analog-to-digital conversion on the limit voltage according to the reference voltage to generate a second sampling signal, and generating the compensation signal according to a difference between the second sampling signal and a reference signal,
wherein the reference signal is generated according to a reference value of the reference voltage.
10. The voltage sampling circuit of claim 9, wherein the processing module comprises a first sampling path and a second sampling path, the first sampling path coupled to the sampling module to generate the first sampled signal, the second sampling path coupled to the compensated detection module to generate the second sampled signal.
11. A drive motor controller, comprising:
a voltage sampling circuit according to any one of claims 1 to 10.
12. A vehicle, characterized by comprising:
the drive motor controller of claim 11.
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| CN115598579A (en) * | 2022-10-11 | 2023-01-13 | 辉羲智能科技（上海）有限公司（Cn） | Vehicle-mounted domain control voltage sampling system and error compensation method and system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115598579A (en) * | 2022-10-11 | 2023-01-13 | 辉羲智能科技（上海）有限公司（Cn） | Vehicle-mounted domain control voltage sampling system and error compensation method and system thereof |
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