CN201360220Y - Frequency converter current signal converting circuit - Google Patents
Frequency converter current signal converting circuit Download PDFInfo
- Publication number
- CN201360220Y CN201360220Y CNU2008201578875U CN200820157887U CN201360220Y CN 201360220 Y CN201360220 Y CN 201360220Y CN U2008201578875 U CNU2008201578875 U CN U2008201578875U CN 200820157887 U CN200820157887 U CN 200820157887U CN 201360220 Y CN201360220 Y CN 201360220Y
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- resistor
- signal
- converting circuit
- frequency converter
- capacitor
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Abstract
The utility model relates to a frequency converter current signal converting circuit. Since the Hall current sensor outputs an AC signal, the AC signal can not be inputted to the digital processing unit which is only capable of receiving a DC signal. The frequency converter current signal converting circuit comprises an RC branch, an operational amplifier and an RR branch, wherein the RC branch comprises a first resistor and a first capacitor, one end of the first resistor is an output end, and one end of the first capacitor is grounded; the positive input end of the operational amplifier is connected with the connection point of the first capacitor and the first resistor, and the negative input end thereof is connected with the output end thereof; and the RR branch comprises a second resistor and a third resistor, one end of the second resistor is connected with the output end of the operational amplifier, one end of the third resistor is connected with power source, and the connection point of the second resistor and the third resistor serves as the output end of the frequency converter current signal converting circuit, and the converting circuit can convert the AC signal outputted by the Hall current sensor to a DC signal.
Description
Technical field
The utility model relates to frequency converter, relates in particular to the current signal change-over circuit that uses in a kind of frequency converter.
Background technology
AC converter is widely used in controlling asynchronous motor, and it is transformed to voltage, frequency with power frequency supply and becomes certain ratio to change, thereby realizes asynchronous motor is carried out accurately speed regulating control.
Frequency converter needs to measure the operating current (interchange) of motor when work, adopt Hall current sensor to measure this operating current usually.But the output signal of Hall current sensor remains AC signal, and uses the digital processing unit (DSP) of this signal can only receive direct current signal.
Practical content
The purpose of this utility model is to provide a kind of inverter current signaling conversion circuit, receives only the problem of direct current signal with digital signal processor in the solution frequency converter.
Inverter current signaling conversion circuit of the present utility model comprises:
A RC branch road comprises first resistor and first capacitor, and an end of this first resistor is an input, an end ground connection of this first capacitor;
This first capacitor links to each other with the tie point of first resistor in an operational amplifier, its positive input terminal and this RC branch road, and its negative input end links to each other with its output; And
A RR branch road comprises second resistor and the 3rd resistor; One end of second resistor links to each other with the output of this operational amplifier, a termination power of the 3rd resistor, and the tie point of this second resistor and the 3rd resistor is as the output of inverter current signaling conversion circuit in this RR branch road.
Utilize inverter current signaling conversion circuit of the present utility model, can convert the AC signal of Hall current sensor output to direct current signal that digital processing unit can receive, solved matching problem between the two.
Description of drawings
Fig. 1 shows the schematic diagram of inverter current signaling conversion circuit of the present utility model.
Embodiment
As shown in Figure 1, inverter current signaling conversion circuit of the present utility model comprises a RC branch road, a RR branch road and an operational amplifier.
The RC branch road comprises first resistor R 1 and the first capacitor C1, and an end of first resistor R 1 receives the AC signal by the output of Hall ac sensor as the input of change-over circuit.The end ground connection of the first capacitor C1.
The positive input terminal of operational amplifier U links to each other with the tie point of first resistor R 1 with the first capacitor C1 in the RC branch road, and the negative input end of operational amplifier links to each other with its output.
The RR branch road comprises second resistor R 44 and the 3rd resistor R 45; One end of second resistor R 44 links to each other with the output of this operational amplifier U, a termination power of the 3rd resistor R 45, and second resistor R 44 in the RR branch road and the tie point of the 3rd resistor R 45 are as the output of inverter current signaling conversion circuit.This signal after conversion can directly be exported to the digital signal processor DSP of back.
The operation principle of inverter current signaling conversion circuit of the present utility model is as follows:
The AC signal of Hall current sensor output is input in the change-over circuit by the RC branch road, enters into operational amplifier U and reaches its output.And, make parallel moving of signal owing to the second and the 3rd resistor R 44 of two equivalences in the RR branch road and the dividing potential drop effect of R45, when promptly input signal was zero, the signal of the output of change-over circuit was 2.5V; When input signal is timing, the signal of the output of change-over circuit is 2.5V～5V; And when input signal when negative, the signal of the output of change-over circuit is 0～2.5V, thereby realized converting the AC signal of Hall current sensor output to direct current signal, this direct current signal just can offer follow-up digital signal processor DSP and carry out corresponding control in real time.
Claims (1)
1, a kind of inverter current signaling conversion circuit is characterized in that, comprising:
A RC branch road comprises first resistor (R1) and first capacitor (C1), and an end of this first resistor (R1) is an input, an end ground connection of this first capacitor (C1);
This first capacitor (C1) links to each other with the tie point of first resistor (R1) in the operational amplifier (U), its positive input terminal and this RC branch road, and its negative input end links to each other with its output; And
A RR branch road comprises second resistor (R44) and the 3rd resistor (R45); One end of second resistor (R44) links to each other with the output of this operational amplifier (U), one termination power of the 3rd resistor (R45), the tie point of this second resistor (R44) and the 3rd resistor (R45) is as the output of inverter current signaling conversion circuit in this RR branch road.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201578875U CN201360220Y (en) | 2008-12-19 | 2008-12-19 | Frequency converter current signal converting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201578875U CN201360220Y (en) | 2008-12-19 | 2008-12-19 | Frequency converter current signal converting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201360220Y true CN201360220Y (en) | 2009-12-09 |
Family
ID=41425984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201578875U Expired - Fee Related CN201360220Y (en) | 2008-12-19 | 2008-12-19 | Frequency converter current signal converting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201360220Y (en) |
-
2008
- 2008-12-19 CN CNU2008201578875U patent/CN201360220Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20141219 |
|
| EXPY | Termination of patent right or utility model |