CN210323186U - Current detection circuit - Google Patents
Current detection circuit Download PDFInfo
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- CN210323186U CN210323186U CN201920946992.5U CN201920946992U CN210323186U CN 210323186 U CN210323186 U CN 210323186U CN 201920946992 U CN201920946992 U CN 201920946992U CN 210323186 U CN210323186 U CN 210323186U
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Abstract
The utility model provides a current detection circuit, which comprises an operation module, a first adjusting module, a second adjusting module, a control module and a selection module; the operation module comprises a non-inverting input end, an inverting input end and an output end; one end of the first adjusting module is connected with the inverting input end, the other end of the first adjusting module is connected with the output end, and the first adjusting module is used for adjusting the gain proportion of the operation module; one end of the second adjusting module is connected with the in-phase input end, the other end of the second adjusting module is connected with the reference voltage end, and the second adjusting module is used for adjusting the bias voltage of the operation module; the control module is connected with the output end of the operation module, is also connected with the selection module and sends a control signal to the selection module; the selection module is respectively connected with the first adjusting module and the second adjusting module and controls the first adjusting module and/or the second adjusting module to be closed. The utility model provides a current detection circuit can compatible hall sensor and shunt, and the configuration is nimble, the cost is lower.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a current detection technical field especially relates to a current detection circuit.
[ background of the invention ]
At present, there are two general methods for detecting the current of the power battery and the energy storage system, one is to use a hall sensor, and the other is to use a shunt. Because the interfaces of the shunt and the hall sensor are inconsistent, different circuit design schemes need to be selected for different sensors in practical application, namely, each interface is respectively provided with a corresponding circuit, and the cost of the detection circuit is further increased.
In view of the above, it is desirable to provide a novel current detection circuit to overcome the above-mentioned drawbacks.
[ Utility model ] content
The utility model aims at providing a current detection circuit, current detection circuit can compatible hall sensor and shunt, can select suitable sensor under the condition of difference, and the configuration is nimble, simple structure and cost are lower.
In order to achieve the above object, the present invention provides a current detection circuit, which includes an operation module, a first adjustment module, a second adjustment module, a control module and a selection module; the operation module comprises a non-inverting input end, an inverting input end and an output end; one end of the first adjusting module is connected with the inverting input end, the other end of the first adjusting module is connected with the output end, and the first adjusting module is used for adjusting the gain proportion of the operation module; one end of the second adjusting module is connected with the non-inverting input end, the other end of the second adjusting module is connected with a reference voltage end, and the second adjusting module is used for adjusting the bias voltage of the operation module; the control module is connected with the output end of the operation module, is also connected with the selection module and sends a control signal to the selection module; the selection module is respectively connected with the first adjusting module and the second adjusting module and controls the first adjusting module and/or the second adjusting module to be closed according to the control signal.
In a preferred embodiment, the first adjusting module comprises a first resistor, a first switch and a second resistor; one end of the first resistor is connected with the inverting input end, the other end of the first resistor is connected with the first switch, and the first switch is connected with the output end; one end of the second resistor is connected with the inverting input end, and the other end of the second resistor is connected with the output end; the selection module is connected with the first switch and is used for controlling the first switch to be closed; the second adjusting module comprises a third resistor, a fourth resistor and a second switch; one end of the third resistor is connected with the non-inverting input end, and the other end of the third resistor is connected with the reference voltage end; one end of the fourth resistor is connected with the non-inverting input end, the other end of the fourth resistor is connected with the second switch, and the second switch is connected with the reference voltage end; the selection module is connected with the second switch and is used for controlling the second switch to be closed.
In a preferred embodiment, the inverting input terminal of the operation module is further connected to a fifth resistor, and the non-inverting input terminal of the operation module is further connected to a sixth resistor.
In a preferred embodiment, the operational module is an operational amplifier.
In a preferred embodiment, the control module is an MCU.
The utility model provides a current detection circuit, selection module link to each other with first adjusting module, second adjusting module respectively, and control module sends control signal to selection module, and selection module basis control signal control first adjusting module and/or the second adjusting module is closed, and then adjusts the gain proportion and the offset voltage of operation module for current detection circuit's detection precision is higher and can compatible shunt and hall sensor, can select suitable sensor under the condition of difference, and the configuration is nimble, simple structure and cost are lower.
[ description of the drawings ]
Fig. 1 is a schematic block diagram of a current detection circuit provided by the present invention.
Fig. 2 is a circuit diagram of the current detection circuit shown in fig. 1.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantageous technical effects of the present invention more clearly understood, the present invention is further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration only and not by way of limitation.
Referring to fig. 1, fig. 1 is a schematic block diagram of a current detection circuit 100 according to the present invention. The current detection circuit 100 is used to connect with a shunt or a hall sensor to detect the system current. The current detection circuit 100 includes an operation module 10, a first adjustment module 20, a second adjustment module 30, a control module 40, and a selection module 50.
The operation module 10 comprises a non-inverting input end 11, an inverting input end 12 and an output end 13; one end of the first adjusting module 20 is connected to the inverting input end 12, the other end of the first adjusting module is connected to the output end 13, and the first adjusting module 20 is configured to adjust a gain ratio of the operation module 10; one end of the second adjusting module 30 is connected to the non-inverting input terminal 11, the other end of the second adjusting module 30 is connected to a reference voltage terminal VREF, and the second adjusting module 30 is configured to adjust a bias voltage of the operation module 10; the control module 40 is connected with the output end 13 of the operation module 10, and the control module 40 is further connected with the selection module 50 and sends a control signal to the selection module 50; the selection module 50 is respectively connected to the first adjustment module 20 and the second adjustment module 30 and controls the first adjustment module 20 and/or the second adjustment module 30 to close according to the control signal.
The utility model provides a current detection circuit 100 selects module 50 to link to each other with first adjusting module 20, second adjusting module 30 respectively, and control module 40 sends control signal to selecting module 50, selects module 50 basis control signal control first adjusting module 20 and/or second adjusting module 30 is closed, and then adjusts the gain proportion and the offset voltage of operation module 10 for current detection circuit 100's the detection precision is higher and can compatible shunt and hall sensor, can select suitable sensor under the condition of difference, and the configuration is nimble, simple structure and cost are lower. In this embodiment, the control module 40 is an MCU (micro controller Unit).
Referring to fig. 2, the first adjusting module 20 further includes a first resistor R1, a first switch K1, and a second resistor R2; one end of the first resistor R1 is connected to the inverting input terminal 12, the other end of the first resistor R1 is connected to the first switch K1, and the first switch K1 is connected to the output terminal 13; one end of the second resistor R2 is connected to the inverting input terminal 12, and the other end of the second resistor R2 is connected to the output terminal 13; the selection module 50 is connected to the first switch K1 and is used to control the first switch K1 to close. In the first adjusting module 20, the first resistor R1 is connected in series with the first switch K1 and then connected in parallel with the second resistor R2, two ends of the parallel connection are respectively connected to the inverting input end 12 and the output end 13 of the operation module 10, and the selection module 50 controls the first switch K1 to be closed, so as to adjust the gain ratio of the operation module 10 by the first adjusting unit 20.
The second regulation module 30 comprises a third resistor R3, a fourth resistor R4 and a second switch K2; one end of the third resistor R3 is connected to the non-inverting input terminal 11, and the other end of the third resistor R3 is connected to the reference voltage terminal VREF; one end of the fourth resistor R4 is connected to the non-inverting input terminal 11, the other end of the fourth resistor R4 is connected to the second switch K2, and the second switch K2 is connected to the reference voltage terminal VREF; the selection module 50 is connected to the second switch K2 and is used to control the second switch K2 to close. In the second adjusting module 30, the fourth resistor R4 is connected in series with the second switch K2 and then connected in parallel with the third resistor R3, two ends of the parallel connection are respectively connected to the non-inverting input end 11 and the output end 13 of the operation module 10, and the selection module 50 controls the second switch K2 to be closed, so as to adjust the bias voltage of the operation module 10 by the second adjusting unit 30. Specifically, the reference voltage terminal VREF is used for an external bias voltage.
Specifically, the operational module 10 is an operational amplifier IC, and it can be understood that a non-inverting input terminal 11 and an inverting input terminal 12 of the operational amplifier IC are used to be connected to a shunt or a hall sensor to collect a system current signal, and send the collected signal to the control module 40 through an output terminal 13 of the operational amplifier IC to perform related analysis operation.
Furthermore, the inverting input end 12 of the operation module 10 is further connected to a fifth resistor R5, and the non-inverting input end 11 of the operation module 10 is further connected to a sixth resistor R6. Specifically, a first input terminal IN1 is led out from one end of the fifth resistor R5 away from the operation module 10, a second input terminal IN2 is led out from one end of the sixth resistor R6 away from the operation module 10, and the first input terminal IN1 and the second input terminal IN2 are further used for connecting a shunt or a hall sensor. The fifth resistor R5 and the sixth resistor R6 are current limiting resistors, so that impedance matching of the input signal is better realized.
The utility model provides a current detection circuit 100's theory of operation as follows:
when the shunt is externally connected, the first input terminal IN1 and the second input terminal IN2 are respectively connected to two ends of the shunt, at this time, the current detection circuit 100 is set to a differential mode, a voltage value with a proper magnitude is obtained by proportional gain and voltage bias of the collected differential value, and then the voltage value is output to the control module 40, for example, to an AD input pin of the MCU.
When the external single-range voltage output type Hall sensor is connected, the first input end IN1 is connected with the output end of the Hall sensor, namely, an input signal is accessed; the second input terminal IN2 is grounded, and the current detection circuit 100 scales the obtained signal (e.g., amplifies the voltage at a low current and reduces the voltage at full scale to meet the MCU input voltage requirement), and then biases the signal to obtain a positive voltage, and outputs the positive voltage to the control module 40.
When the external double-range voltage output type hall sensor is connected, the first input terminal IN1 and the second input terminal IN2 are both connected to the output terminal of the hall sensor, that is, the first input terminal IN1 and the second input terminal IN2 are respectively connected to input signals, at this time, the current detection circuit 100 scales the obtained signals, and then performs biasing to obtain a positive voltage, and outputs the positive voltage to the control module 40.
The utility model provides a current detection circuit 100, selection module 50 link to each other with first regulation module 20, second regulation module 30 respectively, and control module 40 sends control signal to selection module 50, and selection module 50 basis control signal control first switch K1 and/or in the first regulation module 20 second switch K2 in the second regulation module 30 is closed, and then adjusts operational amplifier IC's gain ratio and offset voltage for current detection circuit 100's detection precision is higher and can compatible shunt and hall sensor, can select suitable sensor under the condition of difference, and the configuration is nimble, simple structure and cost are lower.
The invention is not limited solely to that described in the specification and the embodiments, and additional advantages and modifications will readily occur to those skilled in the art, and it is not intended to be limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.
Claims (5)
1. A current detection circuit is characterized by comprising an operation module, a first regulation module, a second regulation module, a control module and a selection module; the operation module comprises a non-inverting input end, an inverting input end and an output end; one end of the first adjusting module is connected with the inverting input end, the other end of the first adjusting module is connected with the output end, and the first adjusting module is used for adjusting the gain proportion of the operation module; one end of the second adjusting module is connected with the non-inverting input end, the other end of the second adjusting module is connected with a reference voltage end, and the second adjusting module is used for adjusting the bias voltage of the operation module; the control module is connected with the output end of the operation module, is also connected with the selection module and sends a control signal to the selection module; the selection module is respectively connected with the first adjusting module and the second adjusting module and controls the first adjusting module and/or the second adjusting module to be closed according to the control signal.
2. The current sensing circuit of claim 1, wherein: the first adjusting module comprises a first resistor, a first switch and a second resistor; one end of the first resistor is connected with the inverting input end, the other end of the first resistor is connected with the first switch, and the first switch is connected with the output end; one end of the second resistor is connected with the inverting input end, and the other end of the second resistor is connected with the output end; the selection module is connected with the first switch and is used for controlling the first switch to be closed;
the second adjusting module comprises a third resistor, a fourth resistor and a second switch; one end of the third resistor is connected with the non-inverting input end, and the other end of the third resistor is connected with the reference voltage end; one end of the fourth resistor is connected with the non-inverting input end, the other end of the fourth resistor is connected with the second switch, and the second switch is connected with the reference voltage end; the selection module is connected with the second switch and is used for controlling the second switch to be closed.
3. The current sensing circuit of claim 2, wherein: the inverting input end of the operation module is further connected with a fifth resistor, and the non-inverting input end of the operation module is further connected with a sixth resistor.
4. The current sensing circuit of claim 3, wherein: the operation module is an operational amplifier.
5. The current sensing circuit of claim 4, wherein: the control module is an MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920946992.5U CN210323186U (en) | 2019-06-21 | 2019-06-21 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920946992.5U CN210323186U (en) | 2019-06-21 | 2019-06-21 | Current detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN210323186U true CN210323186U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920946992.5U Active CN210323186U (en) | 2019-06-21 | 2019-06-21 | Current detection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN210323186U (en) |
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2019
- 2019-06-21 CN CN201920946992.5U patent/CN210323186U/en active Active
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