CN211014442U - Negative voltage current detection circuit - Google Patents
Negative voltage current detection circuit Download PDFInfo
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- CN211014442U CN211014442U CN201921857420.6U CN201921857420U CN211014442U CN 211014442 U CN211014442 U CN 211014442U CN 201921857420 U CN201921857420 U CN 201921857420U CN 211014442 U CN211014442 U CN 211014442U
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- current detection
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Abstract
The utility model discloses a negative voltage current detection circuit, including motor control module, current sampling amplifier module, input difference filter module, sampling resistor, controller negative power input and controller positive power input, controller positive power input links to each other with motor control module, controller negative power input passes through sampling resistor and links to each other with motor control module, input difference filter module and sampling resistor are parallelly connected, current sampling amplifier module links to each other with motor control module and input difference filter module. The utility model belongs to the technical field of current detection, specifically a simple structure, low cost and be independent of outside original controller, do not have the influence to original controller on the electrical property, can not destroy the negative pressure circuit detection circuitry of control circuit's characteristic.
Description
Technical Field
The utility model belongs to the technical field of current detection, specifically indicate a negative voltage current detection circuit.
Background
When detecting the current of the positive power supply, a high-side current detection amplifier is usually used, however, for ISDN and telecommunication power supplies, a current detection amplifier working in a negative power supply is usually required, the original current detection current is a part inserted into a controller, the characteristics of a control circuit are sometimes damaged, and the isolated current detection sensor is expensive, complex in structure and high in cost.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a simple structure, low cost and be independent of outside original controller, have no influence to original controller on the electrical property, can not destroy the negative pressure circuit detection circuitry of control circuit's characteristic.
In order to realize the above functions, the utility model discloses the technical scheme who takes as follows: the utility model provides a negative voltage current detection circuit, includes motor control module, current sampling amplifier module, input difference filter module, sampling resistor, controller negative power input and controller positive power input, controller positive power input links to each other with motor control module, controller negative power input passes through sampling resistor and links to each other with motor control module, input difference filter module and sampling resistor are parallelly connected, current sampling amplifier module links to each other with motor control module and input difference filter module.
Preferably, the operational amplifier is connected with the two resistors in a positive amplification manner, and a positive input end of the operational amplifier is connected with a +5V power supply.
Furthermore, the current sampling amplifying module is a current sampling amplifying circuit.
Furthermore, the input differential filtering module is an externally-hung filtering amplifying circuit.
Furthermore, the motor control module comprises a controller, and the controller and the plug-in filtering and amplifying circuit share one controller input point.
Further, the sampling resistor is inserted between the negative power supply input of the controller and the negative electrode of the external power supply.
Furthermore, the external filter amplifying circuit and the current sampling amplifying circuit are basically independent of the original controller, have almost no influence on the electrical property of the original controller, and are suitable for current sampling of all types of controllers.
Furthermore, the external filter amplifying circuit and the original controller can be installed in a controller box or can be installed in an independent shell.
The utility model adopts the above structure to gain beneficial effect as follows: the utility model provides a pair of simple structure, low cost and be independent of outside original controller, have no influence to original controller on the electrical property, can not destroy the negative pressure circuit detection circuitry of control circuit's characteristic.
Drawings
Fig. 1 is a schematic block diagram of a negative voltage current detection circuit according to the present invention;
fig. 2 is a schematic diagram of the negative voltage current detection circuit of the present invention.
The system comprises a motor control module 1, a current sampling and amplifying module 2, an input differential filtering module 3, a sampling resistor 4, a controller negative power supply input 5, a controller positive power supply input 6, a controller positive power supply input 7, an operational amplifier 8 and a controller.
U1 is an operational amplifier, R1-R4 are resistors, and C1-C2 are capacitors.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments, and the technical features or the connection relations of the present invention, which are not described in detail, are the prior art adopted.
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-2, the utility model relates to a negative pressure current detection circuit, including motor control module 1, current sampling amplifier module 2, input differential filter module 3, sampling resistor 4, controller negative power input 5 and controller positive power input 6, controller positive power input 6 links to each other with motor control module 1, controller negative power input 5 links to each other with motor control module 1 through sampling resistor 4, input differential filter module 3 is parallelly connected with sampling resistor 4, current sampling amplifier module 2 links to each other with motor control module 1 and input differential filter module 3.
The current sampling amplification module 2 comprises an operational amplifier 7 and two resistors, wherein the operational amplifier 7 is connected with the two resistors, the operational amplifier 7 is connected with the two resistors in a positive amplifier mode or a negative amplifier mode, preferably, the operational amplifier 7 is connected with the two resistors in a positive amplification mode, and a positive input end of the operational amplifier 7 is connected with a +5V power supply.
The current sampling amplifying module 2 is a current sampling amplifying circuit.
The input differential filtering module 3 is an externally-hung filtering amplifying circuit.
The motor control module 1 comprises a controller 8, and the controller 8 and the plug-in filtering and amplifying circuit share one controller 8 input point.
The sampling resistor 4 is inserted between the negative power supply input 5 of the controller and the negative electrode of the external power supply.
The external filter amplifying circuit and the current sampling amplifying circuit are basically independent of the original controller 8, almost have no influence on the electrical property of the original controller 8, and are suitable for current sampling of all types of controllers 8.
The external filter amplifying circuit and the original controller 8 can be installed in a box of the controller 8 or can be installed in an independent shell.
The operational amplifier 73 is powered by 5V and then is divided by R1 and R2 to obtain a reference voltage, the operational amplifier 72 forms a negative feedback circuit through a low-pass filter network consisting of R4 sampling resistor 4 and R3 and C1, C2 filters interference on the sampling resistor 4, when current flows on the controller 8, voltage drop is generated on the sampling resistor 4, the flowing current is in direct proportion to the generated voltage drop, and the detection control current is input after being amplified by the U1 operational amplifier 7, so that current detection on the controller 8 is completed.
The present invention and the embodiments thereof have been described above, but the description is not limited thereto, and the embodiment shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (8)
1. A negative voltage current detection circuit characterized in that: the intelligent controller comprises a motor control module, a current sampling and amplifying module, an input differential filtering module, a sampling resistor, a controller negative power supply input and a controller positive power supply input, wherein the controller positive power supply input is connected with a motor control module, the controller negative power supply input is connected with the motor control module through the sampling resistor, the input differential filtering module is connected with the sampling resistor in parallel, and the current sampling and amplifying module is connected with the motor control module and the input differential filtering module.
2. The negative voltage current detection circuit according to claim 1, wherein: the current sampling amplification module comprises an operational amplifier and two resistors, the operational amplifier is connected with the two resistors, and the positive input end of the operational amplifier is connected with a +5V power supply.
3. The negative voltage current detection circuit according to claim 2, wherein: the current sampling amplifying module is a current sampling amplifying circuit.
4. The negative current detection circuit according to claim 3, wherein: the input differential filtering module is an externally-hung filtering amplifying circuit.
5. The negative current detection circuit according to claim 4, wherein: the motor control module comprises a controller, and the controller and the plug-in filtering and amplifying circuit share one controller input point.
6. The negative current detection circuit according to claim 5, wherein: the sampling resistor is inserted between the negative power supply input of the controller and the negative electrode of the external power supply.
7. The negative current detection circuit according to claim 6, wherein: the external filter amplifying circuit and the current sampling amplifying circuit are basically independent of the original controller.
8. The negative voltage current detection circuit according to claim 7, wherein: the external filter amplifying circuit and the original controller can be installed in a controller box or can be installed in an independent shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921857420.6U CN211014442U (en) | 2019-10-31 | 2019-10-31 | Negative voltage current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921857420.6U CN211014442U (en) | 2019-10-31 | 2019-10-31 | Negative voltage current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211014442U true CN211014442U (en) | 2020-07-14 |
Family
ID=71477021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921857420.6U Active CN211014442U (en) | 2019-10-31 | 2019-10-31 | Negative voltage current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211014442U (en) |
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2019
- 2019-10-31 CN CN201921857420.6U patent/CN211014442U/en active Active
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