CN203759094U - Direct-current bus voltage detection circuit of variable-frequency speed governor - Google Patents
Direct-current bus voltage detection circuit of variable-frequency speed governor Download PDFInfo
- Publication number
- CN203759094U CN203759094U CN201420152096.9U CN201420152096U CN203759094U CN 203759094 U CN203759094 U CN 203759094U CN 201420152096 U CN201420152096 U CN 201420152096U CN 203759094 U CN203759094 U CN 203759094U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- amplifying circuit
- current bus
- connects
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to a direct-current bus voltage detection circuit of a variable-frequency speed governor. The direct-current bus voltage detection circuit comprises a voltage-dividing current-limiting clamping circuit, a differential input amplifying circuit and a proportion amplifying circuit, one end of a first series resistor circuit of the voltage-dividing current-limiting clamping circuit is connected with a voltage end of a direct-current bus while the other end of the same is connected with the differential input amplifying circuit, a first diode anode, a second diode cathode and a first resistor respectively, one end of a second series resistor of the voltage-dividing current-limiting clamping circuit is connected with a grounding end of the direct-current bus while the other end of the same is connected with the differential input amplifying circuit, a first diode cathode and a second diode anode, an input end of a first operation amplifier of the differential input amplifying circuit is connected with the voltage-dividing current-limiting clamping circuit while an output end of the same is connected with a third resistor, a same-phase input end of a second operation amplifier of the proportion amplifying circuit is connected with a differential input circuit, a fourth resistor is serially connected between a reverse-phase input end and an output end of the second operation amplifier, and the output end of the second operation amplifier is connected with a fifth resistor which is connected with a control mainboard of the variable-frequency speed governor. Instantaneity, stability and accuracy of the direct-current bus voltage detection circuit are improved.
Description
Technical field
The utility model relates to DC bus-bar voltage detection field, particularly relates to a kind of direct current bus voltage detecting circuit of variable-frequence governor.
Background technology
The DC bus-bar voltage of variable-frequence governor is a parameter very crucial in variable-frequence governor signal detection system, and it has participated directly in the control algolithm of frequency converter, and the accuracy that detects of DC bus-bar voltage has determined the performance of variable-frequence governor.
The direct current bus voltage detecting circuit that prior art generally adopts is to have exported by a secondary of the switch transformer for control system power supply, its principle is the input using DC bus-bar voltage as switch transformer, and a secondary voltage of switch transformer forms corresponding ratio with DC bus-bar voltage.The circuit structure complexity of this detecting pattern, the response time is slower, and real-time is poor, holds and be vulnerable to the vibration interference of transformer itself, and accuracy in detection is not high.
In view of switch transformer detects the existing problem of DC bus-bar voltage, the utility model proposes a kind of circuit structure simple, the direct current bus voltage detecting circuit of the variable-frequence governor of high reliability.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of direct current bus voltage detecting circuit of variable-frequence governor, for solving the problems such as direct current bus voltage detecting circuit complex structure, low-response, the accuracy of existing variable-frequence governor be not high.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of direct current bus voltage detecting circuit of variable-frequence governor, comprises dividing potential drop current limliting clamping circuit, difference input amplifying circuit and ratio amplifying circuit;
Described dividing potential drop current limliting clamping circuit comprises the first resistance in series circuit, the second resistance in series circuit, the first diode, the second diode and the first resistance; Described first resistance in series circuit one end connects DC bus-bar voltage end, the other end connects the in-phase input end of described difference input amplifying circuit, and connect one end of the first diode anode, the second diode cathode and the first resistance and the first resistance other end ground connection simultaneously; Described second resistance in series one end connects DC bus earth terminal, and the other end connects the inverting input of described difference input amplifying circuit, and connects the first diode cathode and the second diode anode simultaneously;
Described difference input amplifying circuit comprises the first operational amplifier, the second resistance, the first electric capacity and the 3rd resistance; Described the first operational amplifier, its in-phase input end is connected described dividing potential drop current limliting clamping circuit with inverting input, and its output terminal connects one end of the 3rd resistance, and the other end of the 3rd resistance is the output terminal of described difference input amplifying circuit;
Described ratio amplifying circuit comprises the second operational amplifier, the 4th resistance and the 5th resistance; Described the second operational amplifier, its in-phase input end connects the output terminal of described Differential input circuit, the 4th resistance of connecting between its inverting input and its output terminal, its output terminal connects the 5th resistance, and the 5th resistance other end connects the control mainboard of variable-frequence governor.
On the basis of technique scheme, the utility model can also do following improvement.
Further, also comprise power circuit, it connects the feeder ear of described difference input amplifying circuit and ratio amplifying circuit.
Further, described power circuit is for providing the power circuit of 15V voltage.
Further, described dividing potential drop current limliting clamping circuit also comprises decoupling capacitor, and itself and the first resistance are in parallel.
Further, described the first resistance in series circuit and described the second resistance in series circuit include series connection and resistance several resistance arbitrarily.
Further, also comprise calibration circuit, and described calibration circuit comprises the 6th resistance and potentiometer of series connection, described the 6th resistance one end connects the inverting input of described the second operational amplifier, and the other end connects potentiometer, the other end ground connection of described potentiometer.
The beneficial effects of the utility model are: the utility model is by the redesign to direct current bus voltage detecting circuit, not only realized variable-frequence governor direct current bus voltage detecting circuit simplification, improved the real-time, stability and the precision that detect, also realized deviation calibration function.
Brief description of the drawings
Fig. 1 is the structural representation of the direct current bus voltage detecting circuit of variable-frequence governor described in the utility model.
In accompanying drawing, the list of parts of each label representative is as follows:
1, dividing potential drop current limliting clamping circuit, 2, difference input amplifying circuit, 3, ratio amplifying circuit, 4, calibration circuit.
Embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, the present embodiment has provided a kind of direct current bus voltage detecting circuit of variable-frequence governor, comprises dividing potential drop current limliting clamping circuit 1, difference input amplifying circuit 2 and ratio amplifying circuit 3;
Described dividing potential drop current limliting clamping circuit 1, its input end connects DC bus, output terminal connects difference input amplifying circuit, for DC bus-bar voltage is converted to a millivolt magnitude voltage signals by dividing potential drop and current limliting, then millivolt magnitude voltage signals is introduced to difference input amplifying circuit 2;
Described difference input amplifying circuit 2, its input end connects described dividing potential drop current limliting clamping circuit, output terminal connects described ratio amplifying circuit, for the millivolt magnitude voltage signals of introducing is amplified and reverted to volt magnitude voltage signals, then will lie prostrate magnitude voltage signals and introduce to ratio amplifying circuit 3;
Described ratio amplifying circuit 3, its input end connects described difference input amplifying circuit, output terminal connects the control mainboard of variable-frequence governor, for the volt magnitude voltage signals of introducing is amplified and reverted to DC bus-bar voltage actual value, and DC bus-bar voltage actual value is exported to the control mainboard of variable-frequence governor.
In addition, also comprise power circuit and calibration circuit 4.Described power circuit connects the feeder ear of described difference input amplifying circuit and ratio amplifying circuit, for powering to difference input amplifying circuit and ratio amplifying circuit; Whether described calibration circuit 4 has deviation for calibrating the DC bus-bar voltage actual value of described ratio amplifying circuit recovery and the variable-frequence governor d-c bus voltage value of setting, and eliminates the deviation existing.
Each circuit concrete structure as shown in Figure 1, mainly contains following a few part and forms:
One, dividing potential drop current limliting clamping circuit
Described dividing potential drop current limliting clamping circuit 1 comprises the first resistance in series circuit, the second resistance in series circuit, the first diode D1, the second diode D2, the first resistance R 21 and for the decoupling capacitor C1 of decoupling, wherein said the first resistance in series circuit comprises series connection and resistance several resistance (the resistance R 1-R10 of series connection successively) arbitrarily, its one end is as the first input end (terminal of R1) of dividing potential drop current limliting clamping circuit, connect DC bus-bar voltage end DC+, the other end is as first output terminal (terminal of R10) of dividing potential drop current limliting clamping circuit, connect the first diode D1 anode, one end of the second diode D2 negative electrode and the first resistance R 21, and the other end ground connection of the first resistance R 21, described decoupling capacitor C1 and the first resistance R 21 are in parallel.
Described the second resistance in series circuit comprises series connection and resistance several resistance (resistance R 11 is to R20) arbitrarily, its one end is as second input end (terminal of R11) of dividing potential drop current limliting clamping circuit, connect DC bus earth terminal 0V, the other end, as second output terminal (terminal of R20) of dividing potential drop current limliting clamping circuit, connects the first diode D1 negative electrode and the second diode D2 anode.
In dividing potential drop current limliting clamping circuit 1, R1-R10, R11-R20, R21 are millivolt level small voltage, milliampere little electric current supply difference input amplifying circuit of level by the 600V of variable-frequence governor or 1000V DC high voltage dividing potential drop current limliting, realize high-voltage great-current and be introduced directly into the function in differential amplifier circuit, by the resistance of proportioning R1-R21 itself, the proportional of input terminal voltage value that can realize variable-frequence governor DC bus-bar voltage and difference input amplifying circuit dwindles.Decoupling capacitor C1 removes the radio-frequency component of the millivolt voltage after dividing potential drop, two diode D1 and D2 form reverse geometry, form clamper function, ensure that voltage signal amplitude after dividing potential drop maintains in the voltage range that difference input amplifying circuit allows, and prevents from damaging difference input amplifying circuit.
Two, difference input amplifying circuit
Described difference input amplifying circuit 2 comprises the first operational amplifier U1A, the second resistance R 22, the first capacitor C 2 and the 3rd resistance R 23; The in-phase input end of described the first operational amplifier U1A and inverting input correspond to in-phase input end and the inverting input of described difference input amplifying circuit.
The in-phase input end of described the first operational amplifier U1A connects the first output terminal of described dividing potential drop current limliting clamping circuit, the inverting input of described the first operational amplifier U1A connects the second output terminal of described dividing potential drop current limliting clamping circuit, the output terminal of described the first operational amplifier connects one end of the 3rd resistance R 23, and the other end of the 3rd resistance R 23 is the output terminal of described difference input amplifying circuit; Described the second resistance R 22 and described the first capacitor C 2 are in parallel, and are all connected between the inverting input and output terminal of described the first operational amplifier U1A.The feeder ear of the first operational amplifier U1A is also connected with power circuit, and power circuit provides 15V voltage.
The first operational amplifier U1A is the core devices of difference input amplifying circuit, coordinate with the second resistance R 22 to have realized the difference millivolt level bus voltage signal of dividing potential drop current limliting clamping circuit output is amplified and reverts to volt level small-signal, because operational amplifier itself possesses isolation features, by operational amplifier, the input/output signal of difference input amplifying circuit is kept apart simultaneously.By build-out resistor R22 resistance, can regulate the enlargement factor of difference input amplifying circuit.
Three, ratio amplifying circuit
Described ratio amplifying circuit 3 comprises the second operational amplifier U1B, the 4th resistance R 24 and the 5th resistance R 25; The in-phase input end of described the second operational amplifier U1B and inverting input correspond to in-phase input end and the inverting input of described ratio amplifying circuit.
Described the second operational amplifier U1B, its in-phase input end connects the output terminal of described Differential input circuit, the 4th resistance R 24 of connecting between its inverting input and output terminal, its output terminal one end connects the 5th resistance R 25, the 5th resistance R 25 other ends are the described relatively output terminal of amplifying circuit, are connected with variable-frequence governor control mainboard.The feeder ear of the second operational amplifier U1B is also connected with power circuit, and power circuit provides 15V voltage.
In ratio amplifying circuit, mate the enlargement factor of the 4th resistance R 24 resistance proportion adjustable amplifying circuits, by operational amplifier, the input/output signal of ratio amplifying circuit is kept apart.The output valve of ratio amplifying circuit is delivered to variable-frequence governor control mainboard, according to the signal amplification factor relation in dividing potential drop current limliting clamping circuit, difference input amplifying circuit, ratio amplifying circuit, can be reverted to DC bus-bar voltage actual value by program design.
Four, calibration circuit
Described calibration circuit 4 comprises the 6th resistance R 26 and the potentiometer R27 of series connection, and described the 6th resistance R 26 one end connect the output terminal of the second operational amplifier U1B, and the other end connects potentiometer R27, the other end ground connection of described potentiometer R27.Calibration circuit is by the resistance of regulator potentiometer R27, and the output terminal that changes the operational amplifier U1B in ratio amplifying circuit feeds back to the magnitude of voltage of inverting input.When the detected value of busbar voltage detection module and actual bus voltage have deviation, regulate calibration circuit can eliminate deviation, thereby improved the progress detecting.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. a direct current bus voltage detecting circuit for variable-frequence governor, is characterized in that, comprises dividing potential drop current limliting clamping circuit, difference input amplifying circuit and ratio amplifying circuit;
Described dividing potential drop current limliting clamping circuit comprises the first resistance in series circuit, the second resistance in series circuit, the first diode, the second diode and the first resistance; Described first resistance in series circuit one end connects DC bus-bar voltage end, the other end connects the in-phase input end of described difference input amplifying circuit, and connect one end of the first diode anode, the second diode cathode and the first resistance and the first resistance other end ground connection simultaneously; Described second resistance in series one end connects DC bus earth terminal, and the other end connects the inverting input of described difference input amplifying circuit, and connects the first diode cathode and the second diode anode simultaneously;
Described difference input amplifying circuit comprises the first operational amplifier, the second resistance, the first electric capacity and the 3rd resistance; Described the first operational amplifier, its in-phase input end is connected described dividing potential drop current limliting clamping circuit with inverting input, and its output terminal connects one end of the 3rd resistance, and the other end of the 3rd resistance is the output terminal of described difference input amplifying circuit;
Described ratio amplifying circuit comprises the second operational amplifier, the 4th resistance and the 5th resistance; Described the second operational amplifier, its in-phase input end connects the output terminal of described Differential input circuit, the 4th resistance of connecting between its inverting input and its output terminal, its output terminal connects the 5th resistance, and the 5th resistance other end connects the control mainboard of variable-frequence governor.
2. direct current bus voltage detecting circuit according to claim 1, is characterized in that, also comprises power circuit, and it connects the feeder ear of described difference input amplifying circuit and ratio amplifying circuit.
3. direct current bus voltage detecting circuit according to claim 2, is characterized in that, described power circuit is for providing the power circuit of 15V voltage.
4. direct current bus voltage detecting circuit according to claim 1, is characterized in that, described dividing potential drop current limliting clamping circuit also comprises decoupling capacitor, and itself and the first resistance are in parallel.
5. direct current bus voltage detecting circuit according to claim 1, is characterized in that, described the first resistance in series circuit and described the second resistance in series circuit include series connection and resistance several resistance arbitrarily.
6. according to arbitrary described direct current bus voltage detecting circuit in claim 1 to 5, it is characterized in that, also comprise calibration circuit, and described calibration circuit comprises the 6th resistance and potentiometer of series connection, described the 6th resistance one end connects the inverting input of described the second operational amplifier, the other end connects potentiometer, the other end ground connection of described potentiometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420152096.9U CN203759094U (en) | 2014-03-31 | 2014-03-31 | Direct-current bus voltage detection circuit of variable-frequency speed governor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420152096.9U CN203759094U (en) | 2014-03-31 | 2014-03-31 | Direct-current bus voltage detection circuit of variable-frequency speed governor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203759094U true CN203759094U (en) | 2014-08-06 |
Family
ID=51254350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420152096.9U Expired - Fee Related CN203759094U (en) | 2014-03-31 | 2014-03-31 | Direct-current bus voltage detection circuit of variable-frequency speed governor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203759094U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218782A (en) * | 2014-09-24 | 2014-12-17 | 阳光电源股份有限公司 | Inverter and DC (Direct Current) bus circuit thereof |
| CN107507734A (en) * | 2017-08-07 | 2017-12-22 | 珠海格力电器股份有限公司 | Relay is depressured holding circuit |
| CN108802446A (en) * | 2018-07-11 | 2018-11-13 | 杭州电子科技大学 | A kind of industrial robot controller busbar voltage detection circuit |
| CN109905023A (en) * | 2019-03-22 | 2019-06-18 | 核工业理化工程研究院 | Conversion circuit is isolated in DC voltage |
-
2014
- 2014-03-31 CN CN201420152096.9U patent/CN203759094U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218782A (en) * | 2014-09-24 | 2014-12-17 | 阳光电源股份有限公司 | Inverter and DC (Direct Current) bus circuit thereof |
| CN104218782B (en) * | 2014-09-24 | 2017-06-13 | 阳光电源股份有限公司 | A kind of inverter and its dc bus circuit |
| CN107507734A (en) * | 2017-08-07 | 2017-12-22 | 珠海格力电器股份有限公司 | Relay is depressured holding circuit |
| CN108802446A (en) * | 2018-07-11 | 2018-11-13 | 杭州电子科技大学 | A kind of industrial robot controller busbar voltage detection circuit |
| CN109905023A (en) * | 2019-03-22 | 2019-06-18 | 核工业理化工程研究院 | Conversion circuit is isolated in DC voltage |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103884900A (en) | Device and method for detecting voltages of direct current bus of variable frequency speed regulator | |
| CN102628889B (en) | Voltage sampling circuit | |
| CN203759094U (en) | Direct-current bus voltage detection circuit of variable-frequency speed governor | |
| CN204101685U (en) | Power device leak current detection device and Intelligent Power Module checkout equipment | |
| CN101614761B (en) | Current-sensing circuit | |
| CN104316755A (en) | Wide-voltage electrical signal voltage detecting device | |
| CN204679892U (en) | A kind of constant current electronic load control system | |
| CN203658440U (en) | High-precision high voltage isolation operational amplifier detection circuit | |
| CN105278610B (en) | A kind of voltage controlled current source circuit | |
| CN202168038U (en) | Difference operational amplifying circuit | |
| CN203882223U (en) | Voltage-controlled current source circuit | |
| CN104660229A (en) | PWM modulation device and output power limiting circuit thereof | |
| CN105445620B (en) | A kind of High voltage output device and method for feeder automation tester | |
| CN108072790B (en) | Current measuring circuit and current measuring method | |
| CN206490664U (en) | Analog quantity modulate circuit | |
| CN211061665U (en) | Current unit | |
| CN110048367A (en) | A kind of overvoltage crowbar and rear end receiving device based on operational amplifier | |
| CN202918246U (en) | Preposed charge amplifier with low noise | |
| CN102722202A (en) | Voltage-current conversion circuit | |
| CN207232237U (en) | A kind of integrated drive generator output end current changes voltage telemeering circuit | |
| CN207218368U (en) | Control circuit and system | |
| CN107291139B (en) | A kind of wideband for driving impedance load and voltage-controlled alternating current large-power current source | |
| CN104518838A (en) | RF power detector and detection method | |
| CN203504144U (en) | Electric leakage sampling circuit | |
| CN203217295U (en) | Analog quantity input following processing circuit for variable frequency speed regulator |
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: 20140806 Termination date: 20150331 |
|
| EXPY | Termination of patent right or utility model |