CN111381095A - Wireless acquisition circuit for motor current of electric bicycle - Google Patents
Wireless acquisition circuit for motor current of electric bicycle Download PDFInfo
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- CN111381095A CN111381095A CN201811608382.0A CN201811608382A CN111381095A CN 111381095 A CN111381095 A CN 111381095A CN 201811608382 A CN201811608382 A CN 201811608382A CN 111381095 A CN111381095 A CN 111381095A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a wireless current collecting circuit of an electric bicycle motor, belonging to the technical field of electric vehicles, comprising a sampling resistor, a current-limiting amplifying circuit, a filter circuit, a sampling MCU, a wireless transmitting module, a wireless receiving module and a control MCU which are connected in series in a power supply loop of a direct current motor of an electric vehicle, wherein a sampling signal of the sampling resistor is input to the input end of the current-limiting amplifying circuit, the output end of the current-limiting amplifying circuit is connected with the filter circuit, the output end of the filter circuit is connected with the AD input end of the sampling MCU, the sampling MCU is communicated with the wireless transmitting module through a serial port, the wireless transmitting module is communicated with the wireless receiving module through a wireless network, the wireless receiving module is connected with the control MCU through a serial port, the technical problem that the current of a rear wheel motor is collected to a control panel by adopting a wireless data transmission network is solved, the invention, the cost and the processing procedure are reduced, and the problem of abrasion of the circuit of the electric vehicle in the moving process is avoided.
Description
Technical Field
The invention belongs to the technical field of electric vehicles, and particularly relates to a wireless current acquisition circuit for a motor of an electric bicycle.
Background
The electric motor car is the indispensable vehicle of domestic trip, because the shape restriction of electric motor car, need link together the control circuit of the motor of rear wheel through bus and the control panel that the handlebar goes out, and the electric motor car shakes the circuit that looses the bus very easily in the vibration that produces of motion process to produce wearing and tearing, influence the normal work of electric motor car.
Traditional electric motor car control system need gather control panel through the current signal of a pair of signal line with the rear wheel motor specially on, because the wiring is long, hardly avoids the interference problem to the wiring process is loaded down with trivial details, receives wearing and tearing easily in the operation process, influences the control panel and piles the control of motor current.
Disclosure of Invention
The invention aims to provide a wireless current acquisition circuit for a motor of an electric bicycle, which solves the technical problem that the current of a rear wheel motor is acquired to a control panel by adopting a wireless data transmission network.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wireless current acquisition circuit for a motor of an electric bicycle comprises a sampling resistor, a current-limiting amplifying circuit, a filter circuit, a sampling MCU, a wireless transmitting module, a wireless receiving module and a control MCU which are connected in series in a power supply loop of a direct current motor of the electric bicycle, wherein a sampling signal of the sampling resistor is input to the input end of the current-limiting amplifying circuit, the output end of the current-limiting amplifying circuit is connected with the filter circuit, the output end of the filter circuit is connected with the AD input end of the sampling MCU, the sampling MCU is communicated with the wireless transmitting module through a serial port, the wireless transmitting module is communicated with the wireless receiving module through a wireless network, and the wireless receiving module is connected with;
the sampling resistor comprises a resistor R1, a resistor R2 and a resistor R3, the resistor R1, the resistor R2 and the resistor R3 are connected in series in a power supply loop of the direct current motor of the electric vehicle, one end of the resistor R3 is connected with a ground wire, and the other end of the resistor R3 is a current sampling end;
the current-limiting amplifying circuit comprises an amplifier IC1, a resistor R7, a resistor R4, a resistor R10, a potentiometer D10, a transistor Q10, a resistor R10 and a resistor R10, wherein the current sampling end is connected with a negative input end of the amplifier IC 10 through the resistor R10, a negative electrode of the amplifier IC 10 is also connected with a middle contact of the potentiometer R10 through the resistor R10, one end of the potentiometer R10 is connected with a 15V power supply through the resistor R10, the other end of the potentiometer R10 is connected with a ground line, a positive input end of the amplifier IC 10 is connected with the ground line through the resistor R10, the negative input end of the amplifier IC 10 is connected with one end of the potentiometer R10, the other end of the potentiometer R10 is connected with an emitter of the transistor Q10, an output end of the amplifier IC 10 is connected with a positive electrode of the diode D10, a negative electrode of the diode D10 is connected with the ground line, an output end of the transistor Q36, an emitter electrode of the triode Q1 is connected with a base electrode of the triode Q2, an emitter electrode of the triode Q2 is connected with a 15V power supply through a resistor R9, and an emitter electrode of the triode Q2 is also connected with a ground wire through a resistor R13;
the filter circuit comprises a resistor R15, a capacitor C1, an amplifier IC2, a resistor R16 and a capacitor C2, wherein one end of the resistor R15 is connected with an emitter of a triode Q2, the other end of the resistor R is connected with a positive electrode of a capacitor C1, a positive electrode of the capacitor C1 is a current signal output end, a negative electrode of the capacitor C1 is connected with a negative input end of an amplifier IC2, a positive input end of the amplifier IC2 is connected with a ground wire, an output end of the amplifier IC2 is connected with a negative electrode of a capacitor C1 through a resistor R16, and an output end of the amplifier IC2 is also connected with a current signal output;
the current signal output end is connected with the AD input end of the MCU.
Preferably, the 15V power is provided by a 15V three-terminal regulator, the model of the 15V three-terminal regulator is LM7815, and the input end of the 15V three-terminal regulator is connected with the battery of the electric vehicle.
Preferably, the amplifier IC1 is model LM 101; the model of the diode D1 is 1N 5226; the resistance value range of the resistor R9 is 0-1.3 k ohm; the type of the amplifier IC2 is uA 741; the models of the control MCU and the sampling MCU are both C8051F 350; the wireless sending module and the wireless receiving module are HSD-61 in model.
The invention relates to a wireless current acquisition circuit of an electric bicycle motor, which solves the technical problem that the current of a rear wheel motor is acquired to a control panel by adopting a wireless data transmission network, saves a sampling signal line between the rear wheel motor and the control panel, reduces the cost and the processing procedure, and avoids the abrasion problem of the line in the movement process of an electric bicycle; the current limiting amplifying circuit is adopted to convert the current collected into a voltage signal, and the output of the voltage signal is limited to 3V, so that the impact of the peak current on the rear sampling MCU when the motor is started is avoided, and the safety of a later circuit is ensured.
Drawings
FIG. 1 is a system architecture diagram of the present invention;
fig. 2 is a circuit diagram of a current limiting amplifying circuit and a filter circuit of the present invention.
Detailed Description
The circuit for wirelessly acquiring the motor current of the electric bicycle comprises a sampling resistor, a current-limiting amplifying circuit, a filter circuit, a sampling MCU, a wireless transmitting module, a wireless receiving module and a control MCU which are connected in series in a power supply loop of a direct current motor of the electric bicycle, wherein a sampling signal of the sampling resistor is input to the input end of the current-limiting amplifying circuit, the output end of the current-limiting amplifying circuit is connected with the filter circuit, the output end of the filter circuit is connected with the AD input end of the sampling MCU, the sampling MCU is communicated with the wireless transmitting module through a serial port, the wireless transmitting module is communicated with the wireless receiving module through a wireless network, and the wireless receiving module is connected with the control MCU through a serial port;
the sampling resistor comprises a resistor R1, a resistor R2 and a resistor R3, the resistor R1, the resistor R2 and the resistor R3 are connected in series in a power supply loop of the direct current motor of the electric vehicle, one end of the resistor R3 is connected with a ground wire, and the other end of the resistor R3 is a current sampling end;
the current-limiting amplifying circuit comprises an amplifier IC1, a resistor R7, a resistor R4, a resistor R10, a potentiometer D10, a transistor Q10, a resistor R10 and a resistor R10, wherein the current sampling end is connected with a negative input end of the amplifier IC 10 through the resistor R10, a negative electrode of the amplifier IC 10 is also connected with a middle contact of the potentiometer R10 through the resistor R10, one end of the potentiometer R10 is connected with a 15V power supply through the resistor R10, the other end of the potentiometer R10 is connected with a ground line, a positive input end of the amplifier IC 10 is connected with the ground line through the resistor R10, the negative input end of the amplifier IC 10 is connected with one end of the potentiometer R10, the other end of the potentiometer R10 is connected with an emitter of the transistor Q10, an output end of the amplifier IC 10 is connected with a positive electrode of the diode D10, a negative electrode of the diode D10 is connected with the ground line, an output end of the transistor Q36, an emitter electrode of the triode Q1 is connected with a base electrode of the triode Q2, an emitter electrode of the triode Q2 is connected with a 15V power supply through a resistor R9, and an emitter electrode of the triode Q2 is also connected with a ground wire through a resistor R13;
the sampling resistor R3 divides the collected current signal into voltage signals and extends into the negative input end of the amplifier IC1, when the current is normal, the diode D1 is not conducted, at the moment, the amplifier IC1, the triode Q1 and the triode Q2 form an inverting amplifier with the gain of 1, and the voltage signals are amplified and then sent to the filter circuit;
if the peak current of motor start is too large, the maximum current output by the amplifier IC1 is 25mA, when the maximum voltage output by the voltage signal reaches the stable voltage of the diode D1, the diode D1 is conducted, the diode D1 clamps the output voltage of the amplifier IC1 at about 3V, the voltage value output to the filter circuit is limited to 1.5-2.5V, and the circuit in the later period is protected from the peak current.
The filter circuit comprises a resistor R15, a capacitor C1, an amplifier IC2, a resistor R16 and a capacitor C2, wherein one end of the resistor R15 is connected with an emitter of a triode Q2, the other end of the resistor R is connected with a positive electrode of a capacitor C1, a positive electrode of the capacitor C1 is a current signal output end, a negative electrode of the capacitor C1 is connected with a negative input end of an amplifier IC2, a positive input end of the amplifier IC2 is connected with a ground wire, an output end of the amplifier IC2 is connected with a negative electrode of a capacitor C1 through a resistor R16, and an output end of the amplifier IC2 is also connected with the current signal;
the invention adopts the amplifier IC2 to form an active filter, which has better filtering effect on alternating current interference signals generated by the motor, and the C1 and the C2 of the invention both adopt low-leakage DC blocking capacitors, so that the input end of the amplifier is well isolated, and the accuracy of the signals is ensured.
The current signal output end is connected with the AD input end of the MCU.
Preferably, the 15V power is provided by a 15V three-terminal regulator, the model of the 15V three-terminal regulator is LM7815, and the input end of the 15V three-terminal regulator is connected with the battery of the electric vehicle.
Preferably, the amplifier IC1 is model LM 101; the model of the diode D1 is 1N 5226; the resistance value range of the resistor R9 is 0-1.3 k ohm; the type of the amplifier IC2 is uA 741; the models of the control MCU and the sampling MCU are both C8051F 350; the wireless sending module and the wireless receiving module are HSD-61 in model.
The invention adopts C8051F350 as a controller, and the controller is provided with 24-bit AD, thereby reducing the cost.
The control MCU is used for connecting the control panel of the electric bicycle.
The electric vehicle battery adopts a 48V battery pack.
The invention relates to a wireless current acquisition circuit of an electric bicycle motor, which solves the technical problem that the current of a rear wheel motor is acquired to a control panel by adopting a wireless data transmission network, saves a sampling signal line between the rear wheel motor and the control panel, reduces the cost and the processing procedure, and avoids the abrasion problem of the line in the movement process of an electric bicycle; the current limiting amplifying circuit is adopted to convert the current collected into a voltage signal, and the output of the voltage signal is limited to 3V, so that the impact of the peak current on the rear sampling MCU when the motor is started is avoided, and the safety of a later circuit is ensured.
Claims (3)
1. The utility model provides a wireless acquisition circuit of electric bicycle motor current which characterized in that: the sampling circuit comprises a sampling resistor, a current-limiting amplifying circuit, a filter circuit, a sampling MCU, a wireless transmitting module, a wireless receiving module and a control MCU which are connected in series in a power supply loop of a direct current motor of an electric vehicle, wherein a sampling signal of the sampling resistor is input to the input end of the current-limiting amplifying circuit, the output end of the current-limiting amplifying circuit is connected with the filter circuit, the output end of the filter circuit is connected with the AD input end of the sampling MCU, the sampling MCU is communicated with the wireless transmitting module through a serial port, the wireless transmitting module is communicated with the wireless receiving module through a wireless network, and the wireless receiving module is connected;
the sampling resistor comprises a resistor R1, a resistor R2 and a resistor R3, the resistor R1, the resistor R2 and the resistor R3 are connected in series in a power supply loop of the direct current motor of the electric vehicle, one end of the resistor R3 is connected with a ground wire, and the other end of the resistor R3 is a current sampling end;
the current-limiting amplifying circuit comprises an amplifier IC1, a resistor R7, a resistor R4, a resistor R10, a potentiometer D10, a transistor Q10, a resistor R10 and a resistor R10, wherein the current sampling end is connected with a negative input end of the amplifier IC 10 through the resistor R10, a negative electrode of the amplifier IC 10 is also connected with a middle contact of the potentiometer R10 through the resistor R10, one end of the potentiometer R10 is connected with a 15V power supply through the resistor R10, the other end of the potentiometer R10 is connected with a ground line, a positive input end of the amplifier IC 10 is connected with the ground line through the resistor R10, the negative input end of the amplifier IC 10 is connected with one end of the potentiometer R10, the other end of the potentiometer R10 is connected with an emitter of the transistor Q10, an output end of the amplifier IC 10 is connected with a positive electrode of the diode D10, a negative electrode of the diode D10 is connected with the ground line, an output end of the transistor Q36, an emitter electrode of the triode Q1 is connected with a base electrode of the triode Q2, an emitter electrode of the triode Q2 is connected with a 15V power supply through a resistor R9, and an emitter electrode of the triode Q2 is also connected with a ground wire through a resistor R13;
the filter circuit comprises a resistor R15, a capacitor C1, an amplifier IC2, a resistor R16 and a capacitor C2, wherein one end of the resistor R15 is connected with an emitter of a triode Q2, the other end of the resistor R is connected with a positive electrode of a capacitor C1, a positive electrode of the capacitor C1 is a current signal output end, a negative electrode of the capacitor C1 is connected with a negative input end of an amplifier IC2, a positive input end of the amplifier IC2 is connected with a ground wire, an output end of the amplifier IC2 is connected with a negative electrode of a capacitor C1 through a resistor R16, and an output end of the amplifier IC2 is also connected with the current signal;
the current signal output end is connected with the AD input end of the MCU.
2. The wireless current collection circuit for the electric bicycle according to claim 1, wherein: the 15V power is provided by 15V three terminal regulator, and 15V three terminal regulator's model is LM7815, and electric motor car battery is connected to 15V three terminal regulator's input.
3. The wireless current collection circuit for the electric bicycle according to claim 1, wherein: the amplifier IC1 is LM 101; the model of the diode D1 is 1N 5226; the resistance value range of the resistor R9 is 0-1.3 k ohm; the type of the amplifier IC2 is uA 741; the models of the control MCU and the sampling MCU are both C8051F 350; the wireless sending module and the wireless receiving module are HSD-61 in model.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811608382.0A CN111381095A (en) | 2018-12-27 | 2018-12-27 | Wireless acquisition circuit for motor current of electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811608382.0A CN111381095A (en) | 2018-12-27 | 2018-12-27 | Wireless acquisition circuit for motor current of electric bicycle |
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| Publication Number | Publication Date |
|---|---|
| CN111381095A true CN111381095A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811608382.0A Pending CN111381095A (en) | 2018-12-27 | 2018-12-27 | Wireless acquisition circuit for motor current of electric bicycle |
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| CN (1) | CN111381095A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113911254A (en) * | 2021-10-28 | 2022-01-11 | 南京懂玫驱动技术有限公司 | Motor and electric power-assisted bicycle driving system |
-
2018
- 2018-12-27 CN CN201811608382.0A patent/CN111381095A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113911254A (en) * | 2021-10-28 | 2022-01-11 | 南京懂玫驱动技术有限公司 | Motor and electric power-assisted bicycle driving system |
| CN113911254B (en) * | 2021-10-28 | 2023-04-07 | 南京懂玫驱动技术有限公司 | Motor and electric power-assisted bicycle driving system |
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