CN204269716U - There is the inverter current change-over circuit of zero potential clamper function - Google Patents
There is the inverter current change-over circuit of zero potential clamper function Download PDFInfo
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- CN204269716U CN204269716U CN201420759999.3U CN201420759999U CN204269716U CN 204269716 U CN204269716 U CN 204269716U CN 201420759999 U CN201420759999 U CN 201420759999U CN 204269716 U CN204269716 U CN 204269716U
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Abstract
The utility model relates to a kind of inverter current change-over circuit with zero potential clamper function, comprise Hall current sensor and signal processing circuit, detection current input terminal and the detection current output terminal of Hall current sensor seal in current sampling circuit, the induced voltage output terminal connection signal treatment circuit of Hall current sensor, the output terminal of signal processing circuit connects MCU, it is characterized in that, also comprise resistance R149, one end of resistance R149 is connected with the circuit between the induced voltage output terminal of Hall current sensor and signal processing circuit, the other end of resistance R149 connects logically.The utility model, by simple circuit design, achieves the noise of current signal when nothing input and eliminates.
Description
Technical field
The utility model relates to a kind of inverter current change-over circuit with zero potential clamper function.
Background technology
Due to when using frequency converter, need the working current (interchange) measuring motor, and also have requirement to the response time of measuring, usually can meet the demands with Hall current sensor, conventional metering circuit as shown in Figure 1, comprise Hall current sensor HR1, detection current input terminal IN and the detection current output terminal OUT1 of Hall current sensor HR1 seal in current sampling circuit, the operating voltage input end VCC+ of Hall current sensor HR1, VCC-connects 15V operating voltage, simultaneously, operating voltage input end VCC+, VCC-and earth terminal GND connects logically AGND, the induced voltage output terminal OUT of Hall current sensor HR1 connects the inverting input of amplifier U8B via resistance R49, the in-phase input end of amplifier U8B meets logically AGND via resistance R50, the output terminal of amplifier U8B connects MCU, at the resistance R52 that the output terminal of amplifier U8B is connected with cross-over connection between its inverting input, the parallel circuit that resistance R55 and resistance R153 and electric capacity C82 is formed in parallel.
Because hall device belongs to magnetic device, than being easier to by extraneous interference, the output of Hall is again voltage signal, and output impedance is higher, is positioned at the interference that some outsides are introduced in TP58 position can to the output of Hall current sensor HR1.
Summary of the invention
The technical problems to be solved in the utility model reduces external disturbance to the impact of the output of Hall current sensor.
In order to solve the problems of the technologies described above, the technical solution of the utility model there is provided a kind of inverter current change-over circuit with zero potential clamper function, comprise Hall current sensor and signal processing circuit, detection current input terminal and the detection current output terminal of Hall current sensor seal in current sampling circuit, the induced voltage output terminal connection signal treatment circuit of Hall current sensor, the output terminal of signal processing circuit connects MCU, it is characterized in that, also comprise resistance R149, one end of resistance R149 is connected with the circuit between the induced voltage output terminal of Hall current sensor and signal processing circuit, the other end of resistance R149 connects logically.
The utility model, by simple circuit design, achieves the noise of current signal when nothing input and eliminates.
Accompanying drawing explanation
Fig. 1 is existing Hall current sensor testing circuit schematic diagram;
A kind of schematic diagram with the inverter current change-over circuit of zero potential clamper function that Fig. 2 provides for the utility model.
Embodiment
For making the utility model become apparent, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
As shown in Figure 2, a kind of inverter current change-over circuit with zero potential clamper function that the utility model provides comprises Hall current sensor HR1, detection current input terminal IN and the detection current output terminal OUT1 of Hall current sensor HR1 seal in current sampling circuit, and operating voltage input end VCC+, VCC-of Hall current sensor HR1 connect 15V operating voltage.Meanwhile, operating voltage input end VCC+, VCC-and earth terminal GND connects logically AGND, and the induced voltage output terminal OUT of Hall current sensor HR1 connects the inverting input of amplifier U8B via resistance R49.Circuit between one end of resistance R149 and the inverting input of the induced voltage output terminal OUT of Hall current sensor HR1 and amplifier U8B is connected, and the other end of resistance R149 connects logically AGND.The in-phase input end of amplifier U8B meets logically AGND via resistance R50, the output terminal of amplifier U8B connects MCU, the parallel circuit that the resistance R52, resistance R55 and the resistance R153 that connect with cross-over connection between its inverting input at the output terminal of amplifier U8B and electric capacity C82 are formed in parallel.
The utility model is by increasing the resistance R149 undesired signal of some outsides can be made to walk negative terminal that minimal tour flows back to power supply, play the effect of clamper at zero point, follow-uply through amplifier U8B, necessary process is carried out to the size of signal again, be processed within level range that MCU can accept.
Claims (1)
1. one kind has the inverter current change-over circuit of zero potential clamper function, comprise Hall current sensor (HR1) and signal processing circuit, detection current input terminal (IN) and detection current output terminal (OUT1) of Hall current sensor (HR1) seal in current sampling circuit, induced voltage output terminal (OUT) the connection signal treatment circuit of Hall current sensor (HR1), the output terminal of signal processing circuit connects MCU, it is characterized in that, also comprise resistance R149, one end of resistance R149 is connected with the circuit between the induced voltage output terminal (OUT) of Hall current sensor (HR1) and signal processing circuit, the other end of resistance R149 connects logically (AGND).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420759999.3U CN204269716U (en) | 2014-12-04 | 2014-12-04 | There is the inverter current change-over circuit of zero potential clamper function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420759999.3U CN204269716U (en) | 2014-12-04 | 2014-12-04 | There is the inverter current change-over circuit of zero potential clamper function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204269716U true CN204269716U (en) | 2015-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420759999.3U Active CN204269716U (en) | 2014-12-04 | 2014-12-04 | There is the inverter current change-over circuit of zero potential clamper function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204269716U (en) |
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2014
- 2014-12-04 CN CN201420759999.3U patent/CN204269716U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |