CN210442425U - Novel current sampling conditioning circuit - Google Patents
Novel current sampling conditioning circuit Download PDFInfo
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- CN210442425U CN210442425U CN201920724438.2U CN201920724438U CN210442425U CN 210442425 U CN210442425 U CN 210442425U CN 201920724438 U CN201920724438 U CN 201920724438U CN 210442425 U CN210442425 U CN 210442425U
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Abstract
The utility model provides a novel current sampling conditioning circuit belongs to motor three-phase current collection technical field. The method solves the problem of how to improve the precision and stability of the wide current sampling signal. The circuit comprises a current sensor, a processing chip, a general current sampling signal input module connected with the output end of the current sensor in parallel and an amplified current sampling signal input module for signal amplification, wherein the amplified current sampling signal input module and the general current sampling signal input module respectively output current sampling signals read after processing to the processing chip, and the current sampling signals read after the processing chip is checked and processed. Therefore, the conditioning circuit can accurately read a large current sampling signal or a small current sampling signal. Therefore, the width and the precision of the current sampling signal are greatly improved, and the accuracy and the stability of reading the current sampling signal are ensured.
Description
Technical Field
The utility model belongs to the technical field of motor three-phase current gathers, a novel current sampling conditioning circuit is related to.
Background
The new energy automobile motor adopts a torque control strategy, controller hardware is needed to sample a three-phase current value to form control closed-loop feedback, and meanwhile, a protection circuit is arranged for preventing the occurrence of a sudden overcurrent condition, so that the collection of the three-phase current value is an important link in a motor control system in the control process of the motor, and the sampling precision directly influences the control effect of the motor. Normally, a Hall current sensor is used for acquiring a three-phase current value, and a voltage signal output by acquiring the three-phase current value is processed by a conditioning circuit and transmitted to a processor chip. The existing conditioning circuit for current sampling is usually realized by a voltage follower circuit after a single filter circuit or a filter circuit is used.
The chinese patent document discloses a three-phase current sampling and current protection circuit with application number 201811157098.6. The device comprises two current sensors, a current sampling input circuit, a third phase current calculation circuit and an overcurrent comparison circuit; the two current sensors respectively sample current of two phases in three phases of the motor controller, the current sampling input circuit is connected with the input end of a third-phase current calculation circuit, the current sampling input circuit uses an operational amplifier chip integrated with four operational amplifiers, and a voltage follower circuit is formed in a mode that 1 pin of an operational amplifier UI in the operational amplifier chip is connected with 2 pins to carry out voltage following and isolation. When the current acquisition input circuit acquires a large current value, the precision can be guaranteed, but when small current is acquired, because the amplitude of a sampling signal is small, the circuit greatly interferes with the small sampling signal, so that the sampling precision cannot be guaranteed, and the control of the motor can be directly influenced when the sampling signal is inaccurate or the precision is not high enough.
Disclosure of Invention
The utility model discloses to the problem that current technique exists, a novel current sampling conditioning circuit is proposed, and how to improve the precision of wide current sampling signal and the problem of stability has been solved to this circuit.
The utility model discloses a following technical scheme realizes:
the utility model provides a novel current sampling conditioning circuit, includes current sensor and processing chip, its characterized in that still includes the general current sampling signal input module of parallel connection current sensor output and the enlarged current sampling signal input module who is used for signal amplification effect, enlarged current sampling signal input module and general current sampling signal input module export the current sampling signal who reads after handling respectively and give processing chip, the current sampling signal who reads after processing chip check-up handles.
The conditioning circuit carries out two-path processing on a current sampling signal detected by the current sensor, and the circuit sampling signal is output to a processing chip after being subjected to signal conditioning through the universal current sampling signal input module and the amplified current sampling signal input module respectively. And reading the final current sampling signal after the processing chip is verified. The general current sampling signal input module processes the detected large current sampling signal and outputs the processed large current sampling signal to the processing chip, so that the large current sampling signal read by the processing chip is more accurate, the amplified current sampling signal input module conditions the small current sampling signal and outputs the conditioned small current sampling signal to the processing chip, so that the small current sampling signal read by the processing chip can be more accurate, the general current sampling signal input module and the amplified current sampling signal input module simultaneously process the current sampling signal detected by the current sensor in application and output the processed current sampling signal, and the current sampling signal is verified by the processing chip. When a large-current sampling signal is input, the signal is amplified through the amplified current sampling signal input module, and the signal input to the processing chip is always the power supply voltage value of the amplified current sampling signal input module. And when the current sampling signal is lower than the limit value, the operational amplification function of the amplified current sampling signal input module starts to work. The current sampling signal read by the universal current sampling signal input module is also carried out, but the reading of the small current sampling signal after the detection of the processing chip is more accurate after the current sampling signal is amplified by the amplified large current sampling signal input module. This application reads the input simultaneously for processing chip through carrying out the general reading of heavy current and the undercurrent enlargies two kinds of modes of reading to the initial current sampling signal of arbitrary one current sensor collection, receives the current acquisition signal that two ways were read by processing chip and checks for this conditioning circuit is no matter can both accurately read to heavy current sampling signal or undercurrent sampling signal. Therefore, the width and the precision of the current sampling signal are greatly improved, and the accuracy and the stability of reading the current sampling signal are ensured.
In the above-mentioned novel current sampling conditioning circuit, the amplified current sampling signal input module includes operational amplifier Q2 and second filter unit, second filter unit includes resistance R3, electric capacity C4 and resistance R5, electric capacity C4 and resistance R5 are parallelly connected and parallelly connected back series connection resistance R3, electric capacity C4 and resistance R5's output ground connection, operational amplifier Q2's non-inverting input end passes through second filter unit and connects current sensor, operational amplifier Q2's inverting input end inputs reference voltage REF, operational amplifier Q2's output passes through resistance R4 feedback connection its inverting input end, and the output of operational amplifier Q2 connects the processing chip. The operational amplifier Q2 and the reference voltage REF form a differential operational amplifier circuit through a resistor R4, and an initial current sampling signal output by the current sensor is filtered, amplified and output to the processing chip. The small current sampling signal is output to a processing chip after being filtered and amplified, so that the interference of the current sampling signal with smaller amplitude in a circuit is reduced, and the reading precision of the current sampling signal is improved.
In the novel current sampling conditioning circuit, the inverting input terminal of the operational amplifier Q2 is further connected with a resistor R2 and a capacitor C3, the reference voltage REF is input to the inverting input terminal of the operational amplifier Q2 through the resistor R2, and the reference voltage REF is grounded and filtered through the capacitor C3. The reference voltage REF is first-order filtered by a capacitor C3 and then input to the inverting input terminal of the operational amplifier Q2 through a resistor R2, and the output terminal of the operational amplifier Q2 is feedback-connected to the inverting input terminal thereof through a resistor R4, thereby forming a differential amplification circuit. The small current sampling signal has an amplification function, and the reading precision and stability of the small current sampling signal side are improved.
In the above novel current sampling conditioning circuit, the general current sampling signal input module includes a first filtering unit, the first filtering unit includes a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 and is grounded, and the output end of the capacitor C1 is connected with the processing chip. The filtering circuit is used for filtering the high-current sampling current and outputting the filtered high-current sampling current to the processing chip for reading, and the filtering circuit is used for processing the general high-current sampling signal independently. The circuit is simple, and the conditioning of a large-current sampling signal can be basically realized.
In the above-mentioned novel current sampling conditioning circuit, the general current sampling signal input module includes operational amplifier Q1, electric capacity C2, resistance R1 and electric capacity C1, resistance R1 connects electric capacity C1 and ground connection, and its inverting input end is connected to operational amplifier Q1's output, and operational amplifier Q1's positive and negative power supply pin passes through electric capacity C2 interconnect, and negative power supply pin ground connection, and positive power supply pin inserts the power, and operational amplifier Q1's non inverting input end receives initial current sampling signal through resistance R1, and the output of operational amplifier Q1 is connected with the processing chip. The current sampling signal is filtered, isolated and voltage-followed when being processed by combining a filter circuit and a voltage-following circuit in one step. The reading precision and stability of the current sampling signal are further improved.
In the novel current sampling conditioning circuit, the operational amplifier Q1 and the operational amplifier Q2 are integrated into an operational amplifier chip. The circuit structure is simplified, and the space of a circuit chip is reduced.
Compared with the prior art, this novel current sampling modulate circuit has following advantage:
1. the utility model discloses an initial current sampling signal to arbitrary one current sensor collection carries out that the heavy current is general to be read and the undercurrent enlargies to read two kinds of modes and reads the input simultaneously and give the processing chip, receives the current acquisition signal that two tunnel read by the processing chip and carries out the check-up for this modulate circuit no matter can both accurately read heavy current sampling signal or undercurrent sampling signal. Therefore, the width and the precision of the current sampling signal are greatly improved, and the accuracy and the stability of reading the current sampling signal are ensured.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a second embodiment of the present invention.
In the figure, 1, a universal current sampling signal input module; 2. and the amplified current sampling signal input module.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
In the first embodiment, as shown in fig. 1, the novel current sampling conditioning circuit includes a current sensor, a processing chip, a general current sampling signal input module 1 connected in parallel to an output end of the current sensor, and an amplified current sampling signal input module 2 for signal amplification, where the amplified current sampling signal input module 2 and the general current sampling signal input module 1 respectively output a current sampling signal read after processing to the processing chip, and the processing chip checks the current sampling signal read after processing.
The amplified current sampling signal input module 2 comprises an operational amplifier Q2 and a filtering unit, the second filtering unit comprises a resistor R3, a capacitor C4 and a resistor R5, the capacitor C4 and the resistor R5 are connected in parallel and then connected in series to a resistor R3, the output ends of the capacitor C4 and the resistor R5 are grounded, the non-inverting input end of the operational amplifier Q2 is connected with a current sensor through the second filtering unit, the inverting input end of the operational amplifier Q2 inputs a reference voltage REF, the output end of the operational amplifier Q2 is connected with the inverting input end through the resistor R4 in a feedback mode, and the output end of the operational amplifier Q2 is connected with a processing chip. The inverting input terminal of the operational amplifier Q2 is further connected with a resistor R2 and a capacitor C3, the reference voltage REF is input to the inverting input terminal of the operational amplifier Q2 through the resistor R2, and the reference voltage REF is filtered to ground through the capacitor C3. The operational amplifier Q2 and the reference voltage REF form a differential operational amplifier circuit through a resistor R4, and an initial current sampling signal output by the current sensor is filtered, amplified and output to the processing chip. The small current sampling signal is output to a processing chip after being filtered and amplified, so that the interference of the current sampling signal with smaller amplitude in a circuit is reduced, and the reading precision of the current sampling signal is improved. The reference voltage REF is first-order filtered by a capacitor C3 and then input to the inverting input terminal of the operational amplifier Q2 through a resistor R2, and the output terminal of the operational amplifier Q2 is feedback-connected to the inverting input terminal through a resistor R2, thereby forming a differential amplifier circuit. The small current sampling signal has an amplification function, and the reading precision and stability of the small current sampling signal side are improved.
The universal current sampling signal input module 1 comprises a first filtering unit, the first filtering unit comprises a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 and is grounded, and the output end of the capacitor C1 is connected with the processing chip. The filtering circuit is used for filtering the high-current sampling current and outputting the filtered high-current sampling current to the processing chip for reading, and the filtering circuit is used for processing the general high-current sampling signal independently. The circuit is simple, and the conditioning of a large-current sampling signal can be basically realized. The further operational amplifier Q1 and the operational amplifier Q2 may belong to the same integrated operational amplifier chip.
The working principle of the novel current sampling conditioning circuit is as follows:
the conditioning circuit carries out two-path processing on a current sampling signal detected by a current sensor, the circuit sampling signal is respectively subjected to signal conditioning through a universal current sampling signal input module 1 and an amplified current sampling signal input module 2 and then output to a processing chip, and the processing chip checks and then reads a final current sampling signal. General current sampling signal input module 1 handles the back and exports for handling the chip to the heavy current sampling signal that detects for the heavy current sampling signal that handles the chip and read is more accurate, and amplification current sampling signal input module 2 conditions the undercurrent sampling signal and exports for handling the chip, makes the undercurrent sampling signal that handles the chip and read can be more accurate. In application, the universal current sampling signal input module 1 and the amplified current sampling signal input module 2 simultaneously process and output current sampling signals detected by the current sensor, and the current sampling signals are verified by the processing chip. When a large current sampling signal is input, the signal is amplified through the amplified current sampling signal input module 2, and then the signal input to the processing chip is always the power supply voltage value of the amplified current sampling signal input module 2. When the current sampling signal is lower than the limit value, the operational amplification function of the amplified current sampling signal input module 2 starts to work. The current sampling signal read by the universal current sampling signal input module 1 is also carried out, but the reading of the small current sampling signal after the detection of the processing chip is more accurate after the current sampling signal is amplified by the amplified large current sampling signal input module 2. This application reads the input simultaneously for processing chip through carrying out the general reading of heavy current and the undercurrent enlargies two kinds of modes of reading to the initial current sampling signal of arbitrary one current sensor collection, receives the current acquisition signal that two ways were read by processing chip and checks for this conditioning circuit is no matter can both accurately read to heavy current sampling signal or undercurrent sampling signal. Therefore, the width and the precision of the current sampling signal are greatly improved, and the accuracy and the stability of reading the current sampling signal are ensured. In the figure, F1 and F2 are current sampling signals respectively adjusted and processed by the general current sampling signal input module 1 and the amplified current sampling signal input module 2, and are used for being transmitted to the processing chip. And Ui is a corresponding current sampling signal obtained by a certain phase current in the three-phase current of the motor detected by the current sensor, and the current sampling signal output by the current sensor is a voltage signal.
Specifically, the method comprises the following steps: an initial current sampling signal Ui output by a current sensor is transmitted to two processing modules, wherein one processing module reads a collecting signal by using a universal current sampling signal input module 1, and the universal current sampling signal input module 1 can be a single filter circuit or a combination of the filter circuit and a voltage follower circuit to process a current collecting signal and is used for reading a current sampling signal when a large current is collected; the other path is realized by using an amplified current sampling signal input module 2. The current sampling signal is read by carrying out operational amplification on the initial small current sampling signal, the current sampling signal is used for reading the current sampling signal when the small current is collected, and finally the two signals F1 and F2 are transmitted to a processing chip together. When a large-current signal is collected, the amplified current sampling signal input module 2 is also reading the current sampling signal, but the signal input into the processing chip is always the power supply voltage value of the operational amplifier Q2 due to the signal amplification of the operational amplifier Q2; when the collected current sampling signal is lower than the limit value, the amplified current sampling signal input module 2 starts to function, and the universal current sampling signal input module 1 also works at the same time, so that two signals F1 and F2 are input to the processing chip, and the processing chip checks the signals after receiving the two signals F1 and F2, so that the precision and the accuracy of the current sampling signal are further ensured. In the figure, a resistor R1 and a capacitor C1 form a simple first-order filter circuit, and the sizes of the resistor R1 and the capacitor C1 are adjusted according to the sampling rate and the input current limit value of an operational amplifier; REF is a reference voltage, and the reference voltage REF, the resistor R2, the resistor R3, the resistor R4 and the resistor R5 are adjusted according to the amplification factor of the circuit. The capacitor C3 and the capacitor C4 form a first-order filter circuit, and the sizes of the capacitor C3 and the capacitor C4 are adjusted according to the sampling rate and the input current limit value of the operational amplifier.
In a second embodiment, as shown in fig. 2, the general current sampling signal input module 1 includes an operational amplifier Q1, a capacitor C2, a resistor R1, and a capacitor C1, wherein the resistor R1 is connected to the capacitor C1 and grounded, an output terminal of the operational amplifier Q1 is connected to an inverting input terminal, positive and negative power pins of the operational amplifier Q1 are connected to each other through the capacitor C2, a negative power pin is grounded, a positive power pin is connected to a power supply, a non-inverting input terminal of the operational amplifier Q1 receives an initial current sampling signal through the resistor R1, and an output terminal of the operational amplifier Q1 is connected to the processing chip. And further, the current sampling signal is filtered, isolated and voltage-followed when being processed by combining a filter circuit and a voltage-following circuit. The reading precision and stability of the current sampling signal are further improved. The rest of the circuit structure and the working principle are the same as those of the first embodiment.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides a novel current sampling conditioning circuit, includes current sensor and processing chip, its characterized in that still includes general current sampling signal input module (1) of parallel connection current sensor output and the enlarged current sampling signal input module (2) that are used for signal amplification effect, enlarged current sampling signal input module (2) and general current sampling signal input module (1) output respectively the current sampling signal who reads after the processing gives processing chip, the current sampling signal who reads after processing chip check-up processing.
2. The novel current sampling conditioning circuit of claim 1, wherein the amplified current sampling signal input module (2) comprises an operational amplifier Q2 and a second filter unit, the non-inverting input terminal of the operational amplifier Q2 is connected to the current sensor through the second filter unit, the second filter unit comprises a resistor R3, a capacitor C4 and a resistor R5, the capacitor C4 and the resistor R5 are connected in parallel and then connected in series to the resistor R3, the output terminals of the capacitor C4 and the resistor R5 are grounded, the inverting input terminal of the operational amplifier Q2 is input with a reference voltage REF, the output terminal of the operational amplifier Q2 is feedback-connected to the inverting input terminal thereof through the resistor R4, and the output terminal of the operational amplifier Q2 is connected to the processing chip.
3. The novel current sampling conditioning circuit of claim 2 wherein the inverting input of the operational amplifier Q2 is further connected to a resistor R2 and a capacitor C3, the reference voltage REF is input to the inverting input of the operational amplifier Q2 through the resistor R2, and the reference voltage REF is filtered to ground through a capacitor C3.
4. The novel current sampling conditioning circuit according to claim 1, 2 or 3, wherein the universal current sampling signal input module (1) comprises a first filtering unit, the first filtering unit comprises a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 and grounded, and the output end of the capacitor C1 is connected with a processing chip.
5. The novel current sampling conditioning circuit as claimed in claim 2 or 3, wherein the general current sampling signal input module (1) comprises an operational amplifier Q1, a capacitor C2, a resistor R1 and a capacitor C1, the resistor R1 is connected with the capacitor C1 and grounded, the output terminal of the operational amplifier Q1 is connected with the inverting input terminal thereof, the positive and negative power supply pins of the operational amplifier Q1 are connected with each other through the capacitor C2, the negative power supply pin is grounded, the positive power supply pin is connected with a power supply, the non-inverting input terminal of the operational amplifier Q1 receives the initial current sampling signal through the resistor R1, and the output terminal of the operational amplifier Q1 is connected with the processing chip.
6. The novel current sampling conditioning circuit of claim 5 wherein the operational amplifier Q1 and the operational amplifier Q2 are integrated into one operational amplifier chip.
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| CN201920724438.2U CN210442425U (en) | 2019-05-20 | 2019-05-20 | Novel current sampling conditioning circuit |
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| CN201920724438.2U CN210442425U (en) | 2019-05-20 | 2019-05-20 | Novel current sampling conditioning circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736003A (en) * | 2020-06-22 | 2020-10-02 | 广东省大湾区集成电路与系统应用研究院 | Current sampling device, system and current sampling method |
| CN112630504A (en) * | 2020-12-30 | 2021-04-09 | 广东拓斯达科技股份有限公司 | Current sampling circuit |
| WO2024198555A1 (en) * | 2023-03-31 | 2024-10-03 | 蔚来汽车科技(安徽)有限公司 | Signal conditioning circuit and pedal signal detection circuit |
-
2019
- 2019-05-20 CN CN201920724438.2U patent/CN210442425U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111736003A (en) * | 2020-06-22 | 2020-10-02 | 广东省大湾区集成电路与系统应用研究院 | Current sampling device, system and current sampling method |
| CN112630504A (en) * | 2020-12-30 | 2021-04-09 | 广东拓斯达科技股份有限公司 | Current sampling circuit |
| WO2024198555A1 (en) * | 2023-03-31 | 2024-10-03 | 蔚来汽车科技(安徽)有限公司 | Signal conditioning circuit and pedal signal detection circuit |
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