CN210639251U - Low-cost motor current acquisition circuit - Google Patents
Low-cost motor current acquisition circuit Download PDFInfo
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- CN210639251U CN210639251U CN201920854436.5U CN201920854436U CN210639251U CN 210639251 U CN210639251 U CN 210639251U CN 201920854436 U CN201920854436 U CN 201920854436U CN 210639251 U CN210639251 U CN 210639251U
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Abstract
The utility model discloses a low-cost motor current acquisition circuit and collection method thereof relates to motor technical field. The utility model discloses a resistance R1, R2, R3, R4, R5, electric capacity C1, C2, diode D1, D2, singlechip and MOS pipe K, diode D2's negative pole is through the ADC _ CUR1 interface of resistance R2 and the access singlechip of R3 of establishing ties; the resistor R5 and the capacitor C1 are connected in parallel to form a filter circuit which is connected between the diode D2 and the resistor R2, the diode D1 and the resistor R1 are connected in parallel to form a voltage stabilizing circuit which is connected between the resistors R2 and R3; the CUR1_ SEL interface of the single chip microcomputer is connected between the resistors R2 and R3 through the resistor R4; the anode of the diode D2 is connected to the MOS transistor K through the motor M1. The utility model discloses a detect the current value that the MOS pipe of establishing ties with the motor passes through and detect the motor current value, reduce the degree of difficulty to passing through motor current detection, the utility model has the advantages of simple structure, low cost when keeping the degree of accuracy to current detection, very big reduce cost improves production profit.
Description
Technical Field
The utility model belongs to the technical field of the motor, especially, relate to a low-cost motor current acquisition circuit.
Background
The use of electric motors is required on some vehicles or some production facilities. When the motor is used, in order to know parameters such as the running condition of the motor, the rotating speed of the motor and the like, current data of the motor needs to be acquired. The common acquisition method is to directly detect the motor circuit through a plurality of detection devices, and although the detection precision is higher, the cost is higher, and the popularization is difficult.
Disclosure of Invention
An object of the utility model is to provide a low-cost motor current acquisition circuit and collection method thereof solves the problem that current motor current acquisition circuit is complicated and the collection process is troublesome.
In order to solve the technical problem, the utility model discloses a realize through following technical scheme:
the utility model relates to a low-cost motor current acquisition circuit, including resistance R1, R2, R3, R4, R5, electric capacity C1, C2, diode D1, D2, singlechip and MOS pipe K; the anode of the diode D2 is connected with an MOS tube K; the cathode of the diode D2 is connected with a resistor R2; the resistor R5 and the capacitor C1 are connected in parallel to form a filter circuit, one end of the filter circuit is connected between the diode D2 and the resistor R2, and the other end of the filter circuit is grounded; the resistor R2 is connected to an ADC _ CUR1 interface of the single chip microcomputer through a resistor R3; one end of the capacitor C2 is connected between the resistor R3 and an ADC _ CUR1 interface of the single chip microcomputer, and the other end of the capacitor C2 is grounded; the selection resistor CUR1_ SEL interface of the single chip microcomputer is connected in series with the resistor R4 and then is connected between the resistor R2 and the resistor R3; the diode D1 and the resistor R1 are connected in parallel to form a voltage stabilizing circuit, one end of the voltage stabilizing circuit is connected between the resistor R2 and the resistor R3, and the other end of the voltage stabilizing circuit is connected with a high level.
Preferably, the motor to be acquired by the acquisition circuit is arranged between the diode D2 and the MOS transistor K.
Preferably, the cathode of the diode D1 is connected to a high level, and the anode of the diode D1 is connected to the resistor R2.
The utility model discloses a use method does:
SS 10: the acquisition circuit detects the connection performance of the motor winding;
SS 20: the acquisition circuit corrects a reference value of the on-resistance R0 of the MOS tube K;
SS 30: detecting a voltage reduction value V on the MOS tube K when the MOS tube K is conducted;
SS 40: the current is calculated from the relationship between the detected step-down value V and the on-resistance R0.
Preferably, said step SS01 further comprises the steps of:
SS 11: closing the MOS tube K, setting a single chip microcomputer selection resistor CUR1_ SEL interface to be in a high-resistance state, and simultaneously setting a sampling difference value threshold value x;
SS 12: the single chip microcomputer ADC _ CUR1 interface samples to obtain a sampling value AD 0;
SS 13: disconnecting the MOS transistor K, and sampling through an ADC _ CUR1 interface of the single chip microcomputer to obtain a sampling value AD 1;
SS 14: comparing the two sampling values AD0 with AD1, judging the fault of the motor winding according to the difference value of the two sampling values, if the difference value of the two sampling values is less than x, indicating that the motor winding is normal, otherwise, judging that the motor winding is in fault.
The utility model discloses following beneficial effect has:
1. the utility model discloses a detect the current value that passes through with the MOS pipe of motor series connection and detect the motor current value, reduce the degree of difficulty to passing through motor current detection.
2. The utility model has the advantages of simple structure, low cost when keeping the degree of accuracy to current detection, very big reduce cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of connecting parts of a low-cost motor current collecting circuit according to the present invention;
fig. 2 is a flow chart of a collecting method of a low-cost motor current collecting circuit of the present invention;
fig. 3 is a flowchart of the steps involved in the step of SS10 in fig. 2.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying 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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, the present invention relates to a low-cost motor current collecting circuit, which includes resistors R1, R2, R3, R4, R5, capacitors C1, C2, diodes D1, D2, a single chip and a MOS transistor K; the anode of the diode D2 is connected with the MOS tube K; the cathode of the diode D2 is connected with the resistor R2; the resistor R5 and the capacitor C1 are connected in parallel to form a filter circuit, one end of the filter circuit is connected between the diode D2 and the resistor R2, and the other end of the filter circuit is grounded; the resistor R2 is connected to an ADC _ CUR1 interface of the singlechip through a resistor R3; one end of a capacitor C2 is connected between the resistor R3 and an ADC _ CUR1 interface of the singlechip, and the other end of the capacitor C2 is grounded; a selection resistor CUR1_ SEL interface of the single chip microcomputer is connected in series with the resistor R4 and then connected between the resistor R2 and the resistor R3; the diode D1 and the resistor R1 are connected in parallel to form a voltage stabilizing circuit, one end of the voltage stabilizing circuit is connected between the resistor R2 and the resistor R3, and the other end of the voltage stabilizing circuit is connected with a high level.
The motor to be acquired by the acquisition circuit is arranged between the diode D2 and the MOS tube K.
The cathode of the diode D1 is connected to the high level, and the anode of the diode D1 is connected to the resistor R2.
Referring to fig. 2, the current collecting method of the circuit of the present invention includes the following steps:
SS 10: the acquisition circuit detects the connection performance of the motor winding;
SS 20: the acquisition circuit corrects a reference value of the on-resistance R0 of the MOS tube K;
SS 30: detecting a voltage reduction value V on the MOS tube K when the MOS tube K is conducted;
SS 40: the current is calculated from the relationship between the detected step-down value V and the on-resistance R0.
As shown in fig. 3, step SS01 further includes the steps of:
SS 11: closing the MOS transistor K, setting a single chip microcomputer selection resistor CUR1_ SEL interface to be in a high-resistance state, and simultaneously setting a sampling difference value threshold value x;
SS 12: sampling is carried out on an ADC _ CUR1 interface of the single chip microcomputer to obtain a sampling value AD 0;
SS 13: disconnecting the MOS transistor K, and sampling through an interface ADC _ CUR1 of the single chip microcomputer to obtain a sampling value AD 1;
SS 14: comparing the two sampling values AD0 with AD1, judging the fault of the motor winding according to the difference value of the two sampling values, if the difference value of the two sampling values is less than x, indicating that the motor winding is normal, otherwise, judging that the motor winding is in fault.
Example two:
referring to fig. 1, the present invention relates to a low-cost motor current collecting circuit and a collecting method thereof, and the working principle is as follows: when MOS pipe K switches on, can produce step-down V because MOS pipe K resistance of own when the current flows to the motor from MOS pipe K, calculate the size of electric current i through the relation between the measurement of the voltage on MOS pipe K and MOS pipe K resistance of own, because the motor is in series with MOS pipe, the electric current value that so this moment calculated is the current value that the motor passes through promptly.
When the step-down voltage V on the MOS tube K is measured, the reference value of the resistor R0 of the MOS tube K needs to be calibrated, because the resistance changes along with the temperature, when the temperature change of the used MOS tube K is low, the influence of the temperature on the resistor R0 can be ignored, and when the temperature change of the used MOS tube K is large, the reference value of the resistor R0 is calibrated through the temperature measurement through the use manual of the MOS tube.
Example three:
referring to fig. 1, the present invention relates to a low-cost motor current collecting circuit and a collecting method thereof, wherein parameters of some electronic components are as follows:
| device names or symbols | Parameter(s) | Device names or symbols | Parameter(s) |
| R1 | 33KΩ | R5 | 4.7KΩ |
| R2 | 14KΩ | C1 | 1nF |
| R3 | 47KΩ | C2 | 10nF |
| R4 | 1.5KΩ |
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean 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.
The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. The utility model provides a low-cost motor current acquisition circuit which characterized in that: the circuit comprises resistors R1, R2, R3, R4, R5, capacitors C1 and C2, diodes D1 and D2, a singlechip and an MOS (metal oxide semiconductor) transistor K; the anode of the diode D2 is connected with an MOS tube K; the cathode of the diode D2 is connected with a resistor R2; the resistor R5 and the capacitor C1 are connected in parallel to form a filter circuit, one end of the filter circuit is connected between the diode D2 and the resistor R2, and the other end of the filter circuit is grounded; the resistor R2 is connected to an ADC _ CUR1 interface of the single chip microcomputer through a resistor R3; one end of the capacitor C2 is connected between the resistor R3 and an ADC _ CUR1 interface of the single chip microcomputer, and the other end of the capacitor C2 is grounded; the selection resistor CUR1_ SEL interface of the single chip microcomputer is connected in series with the resistor R4 and then is connected between the resistor R2 and the resistor R3; the diode D1 and the resistor R1 are connected in parallel to form a voltage stabilizing circuit, one end of the voltage stabilizing circuit is connected between the resistor R2 and the resistor R3, and the other end of the voltage stabilizing circuit is connected with a high level.
2. The low-cost motor current collection circuit according to claim 1, wherein the motor to be collected by the collection circuit is arranged between a diode D2 and a MOS transistor K.
3. The low-cost motor current collection circuit according to claim 1, wherein the cathode of the diode D1 is connected to high level, and the anode of the diode D1 is connected to the resistor R2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920854436.5U CN210639251U (en) | 2019-06-07 | 2019-06-07 | Low-cost motor current acquisition circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920854436.5U CN210639251U (en) | 2019-06-07 | 2019-06-07 | Low-cost motor current acquisition circuit |
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| CN210639251U true CN210639251U (en) | 2020-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308391A (en) * | 2019-06-07 | 2019-10-08 | 横店集团英洛华电气有限公司 | A kind of low cost current of electric Acquisition Circuit and its acquisition method |
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2019
- 2019-06-07 CN CN201920854436.5U patent/CN210639251U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308391A (en) * | 2019-06-07 | 2019-10-08 | 横店集团英洛华电气有限公司 | A kind of low cost current of electric Acquisition Circuit and its acquisition method |
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