CN203310901U - Circuit for measuring bridge current of three-phase bridge-type rectification circuit - Google Patents
Circuit for measuring bridge current of three-phase bridge-type rectification circuit Download PDFInfo
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- CN203310901U CN203310901U CN2013203887018U CN201320388701U CN203310901U CN 203310901 U CN203310901 U CN 203310901U CN 2013203887018 U CN2013203887018 U CN 2013203887018U CN 201320388701 U CN201320388701 U CN 201320388701U CN 203310901 U CN203310901 U CN 203310901U
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Abstract
The utility model provides a circuit for measuring bridge current of a three-phase bridge-type rectification circuit. The circuit for measuring the bridge current of the three-phase bridge-type rectification circuit includes an LT6100 chip. To-be-measured resistors are correspondingly connected between input voltage terminals and drain electrodes of field effect tubes of the three-phase bridge-type rectification circuit in series. One ends of the to-be-measured resistors, connected with the input voltage terminals, are also connected with a pin 8 of the LT6100 chip. The other ends of the to-be-measured resistors are connected with a pin 1 of the LT6100 chip. A pin 3 of the LT6100 chip is in ground connection through a 220pF capacitor. A pin 4 and a pin 7 are both in ground connection. A pin 2 is connected with a positive electrode of a DC power source. A pin 5 is connected with a pin 6. The utility model aims to provide the circuit for measuring the bridge current of the three-phase bridge-type rectification circuit and the circuit for measuring the bridge current of the three-phase bridge-type rectification circuit is simple in design and comparatively high in measurement precision.
Description
Technical field
The utility model relates to the circuit of measuring electric current on the three-phase bridge rectifier circuit jackshaft.
Background technology
In the control without sensor of permagnetic synchronous motor, to replace physically for the speed of rotor and the measurement of position with the measurement of the current/voltage for motor, with the current and voltage signals of motor, by certain nonlinear algorithm, estimate speed and the position signalling of motor, so in these researchs, be exactly vital for the measurement of the electric current of motor.But existing correlated current metering circuit is all comparatively complicated, and measuring accuracy is also lower.
The utility model content
For solving the problems of the technologies described above, the utility model provides the circuit of electric current on the measurement three-phase bridge rectifier circuit jackshaft that a kind of simplicity of design, measuring accuracy are higher.
The utility model is measured the circuit of electric current on the three-phase bridge rectifier circuit jackshaft, comprise the LT6100 chip, the measured resistance of connecting between the drain electrode of each input voltage of described three-phase bridge rectifier circuit and field effect transistor, the end that measured resistance is connected with input voltage also is connected with the pin 8 of described LT6100 chip, the other end of measured resistance is connected with LT6100 chip pin 1, LT6100 chip pin 3 is by the capacity earth of 220pF, pin 4 and the equal ground connection of pin 7, pin 2 is connected with DC power anode, and pin 5 is connected with pin 6.
The utility model is measured the circuit of electric current on the three-phase bridge rectifier circuit jackshaft, and the voltage of described direct supply is 5 volts, and measured resistance is 25 milliohms.
In three-phase bridge rectifier circuit, have altogether six field effect transistor, as switch, use, the circuit that the utility model is measured electric current on the three-phase bridge rectifier circuit jackshaft measured resistance of connecting between each field effect transistor and input voltage, and connect electric current on the bridge of LT6100 chip in measuring three-phase bridge rectifier circuit at the measured resistance two ends.LT6100 is according to present connection, amplification coefficient is 25, the output voltage V out that is LT6100 chip pin 5 and 6 is 25 times of voltage on measured resistance, can calculate the electric current through measured resistance so, be electric current I=Vout/ (R*25) on the three-phase bridge rectifier circuit jackshaft, wherein R is the resistance of measured resistance.
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.Following examples are used for the utility model is described, but are not used for limiting scope of the present utility model.
The accompanying drawing explanation
Fig. 1 is the circuit structure diagram of electric current on measurement three-phase bridge rectifier circuit jackshaft of the present utility model.
Embodiment
As shown in Figure 1, the utility model is measured the circuit of electric current on the three-phase bridge rectifier circuit jackshaft, comprise the LT6100 chip, the measured resistance of connecting between the drain electrode of each input voltage of three-phase bridge rectifier circuit and field effect transistor, measured resistance is 25 milliohms, the end that measured resistance is connected with input voltage also is connected with the pin 8 of LT6100 chip, the other end of measured resistance is connected with LT6100 chip pin 1, LT6100 chip pin 3 is by the capacity earth of 220pF, pin 4 and the equal ground connection of pin 7, pin 2 is connected with the DC power anode of 5 volts, pin 5 is connected with pin 6.
Wherein the LT6100 chip, produced by Linear Technology company.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (2)
1. measure the circuit of electric current on the three-phase bridge rectifier circuit jackshaft, it is characterized in that: comprise the LT6100 chip, the measured resistance of connecting between the drain electrode of each input voltage of described three-phase bridge rectifier circuit and field effect transistor, the end that measured resistance is connected with input voltage also is connected with the pin 8 of described LT6100 chip, the other end of measured resistance is connected with LT6100 chip pin 1, LT6100 chip pin 3 is by the capacity earth of 220pF, pin 4 and the equal ground connection of pin 7, pin 2 is connected with DC power anode, and pin 5 is connected with pin 6.
2. the circuit of electric current on measurement three-phase bridge rectifier circuit jackshaft according to claim 1, it is characterized in that: the voltage of described direct supply is 5 volts, measured resistance is 25 milliohms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203887018U CN203310901U (en) | 2013-07-02 | 2013-07-02 | Circuit for measuring bridge current of three-phase bridge-type rectification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203887018U CN203310901U (en) | 2013-07-02 | 2013-07-02 | Circuit for measuring bridge current of three-phase bridge-type rectification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203310901U true CN203310901U (en) | 2013-11-27 |
Family
ID=49617102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203887018U Expired - Fee Related CN203310901U (en) | 2013-07-02 | 2013-07-02 | Circuit for measuring bridge current of three-phase bridge-type rectification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203310901U (en) |
-
2013
- 2013-07-02 CN CN2013203887018U patent/CN203310901U/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 | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: DATANG NORTHEAST ELECTRIC POWER TEST RESEARCH INSTITUTE CO., LTD. Assignor: China Datang Group Science & Technology Research Institute Co., Ltd. Contract record no.: 2015990000401 Denomination of utility model: Circuit for measuring bridge current of three-phase bridge-type rectification circuit Granted publication date: 20131127 License type: Exclusive License Record date: 20150602 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131127 Termination date: 20170702 |