CN204405729U - Frequency converter three-phase output voltage acquisition circuit - Google Patents
Frequency converter three-phase output voltage acquisition circuit Download PDFInfo
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- CN204405729U CN204405729U CN201520018297.4U CN201520018297U CN204405729U CN 204405729 U CN204405729 U CN 204405729U CN 201520018297 U CN201520018297 U CN 201520018297U CN 204405729 U CN204405729 U CN 204405729U
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Abstract
The utility model relates to a kind of frequency converter three-phase output voltage Acquisition Circuit, comprises high pressure attenuator circuit, calculus of differences circuit, pressure sampling circuit, analog switching circuit and analog integrator circuit that electric signal successively connects.High pressure attenuator circuit is used for three phase converter to export to carry out high-tension resistive decay; Calculus of differences circuit is used for three groups of pwm signals after by decay and carries out calculus of differences; Pressure sampling circuit is used for the signal after calculus of differences to carry out dividing potential drop sampling; Analog switching circuit is used for the conversion signal after dividing potential drop being carried out simulating signal switch; Analog integrator circuit is used for the signal generation simulating signal feeding processor after being changed by analog switch and carries out A/D sampling.The utility model achieves the application of frequency converter three-phase output voltage as control loop; the basis of original current regulator and speeds control ring adds voltage control loop; voltage control loop is used for restriction at frequency converter as during rectification feedback, protection frequency converter.
Description
Technical field
The utility model relates to voltage collection circuit, refers to a kind of frequency converter three-phase output voltage Acquisition Circuit particularly.
Background technology
Current frequency converter adopts closed-loop control more on raising control performance; closed-loop control in pattern more adopts current regulator and speeds control ring; current regulator detects restriction and protects frequency converter itself and drive load (motor), and the detection restriction of speeds control ring protects rotating speed and the rotary speed precision of motor.But frequency converter is as the protection that cannot realize during rectification feedback frequency converter.
Summary of the invention
The utility model object is overcome above-mentioned the deficiencies in the prior art and provide a kind of frequency converter three-phase output voltage Acquisition Circuit; this Acquisition Circuit adds Voltage loop on the basis of existing electric current loop and speed ring; thus improve the control performance of frequency converter; restriction is used for as during rectification feedback, protection frequency converter at frequency converter.
The technical scheme realizing the employing of the utility model object is a kind of frequency converter three-phase output voltage Acquisition Circuit, comprising:
High pressure attenuator circuit, for three phase converter is exported U, V, W carry out high-tension resistive decay to the pwm signal of N;
Calculus of differences circuit, is connected with described high pressure attenuator circuit, for three groups of pwm signals after decay are carried out calculus of differences;
Pressure sampling circuit, is connected with described calculus of differences circuit, for the signal after calculus of differences being carried out the dividing potential drop sampling of three kinds of ratios of each road signal;
Analog switching circuit, is connected with described pressure sampling circuit, and for 9 road signals after dividing potential drop being carried out the conversion of 6 kinds of knockdown simulating signal switches, the signal after conversion is carried out again the conversion of three kinds of combinations, conversion generates stairstep signal; And
Analog integrator circuit, is connected with described analog switching circuit, carries out A/D sampling for the signal generation simulating signal feeding processor after being changed by analog switch.
In technique scheme, described high pressure attenuator circuit is for being connected to three phase converter output terminal U, the resistance in series of V, W, N.
The utility model frequency converter three-phase exports (PWM) sample circuit; achieve the application of frequency converter three-phase output voltage as control loop; the basis of original current regulator and speeds control ring adds voltage control loop; voltage control loop is used for restriction at frequency converter as during rectification feedback, protection frequency converter.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the utility model frequency converter three-phase output voltage Acquisition Circuit.
Fig. 2 is the circuit diagram of high pressure attenuator circuit.
Fig. 3 is the circuit diagram of calculus of differences circuit.
Fig. 4 is three kinds of ratio value pressure sampling circuits.
Fig. 5 is the circuit diagram of analog switching circuit.
Fig. 6 is the circuit diagram of analog integrator circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, the utility model frequency converter three-phase output voltage Acquisition Circuit, comprising: successively electric signal connect high pressure attenuator circuit, calculus of differences circuit, pressure sampling circuit, analog switching circuit and analog integrator circuit.
In the present embodiment, high pressure attenuator circuit as shown in Figure 2, is realized by resistant series dividing potential drop, and for three phase converter is exported U, V, W carry out high-tension resistive decay to the pwm signal of N.
In the present embodiment, deamplification is carried out a certain proportion of computing by differential operational amplifier by calculus of differences circuit, and as shown in Figure 3, calculus of differences circuit is connected with described high pressure attenuator circuit, for three groups of pwm signals after decay are carried out calculus of differences.
Pressure sampling circuit is connected with calculus of differences circuit, and each the road signal after calculus of differences is obtained 9 road signals by three kinds of proportion divider samplings by pressure sampling circuit, and three kinds of ratio value pressure sampling circuits as shown in Figure 4.
Analog switching circuit as shown in Figure 5, is connected with pressure sampling circuit, 9 road signals after dividing potential drop is carried out the conversion of 6 kinds of knockdown simulating signal switches, the signal after conversion is carried out again the conversion of three kinds of combinations, and conversion generates stairstep signal.
Analog integrator circuit is connected with analog switching circuit, and the utility model analog integrator circuit used as shown in Figure 6, is generate simulating signal after analog switch switching signal being carried out Integral Processing again with analogue integrator, finally sends into processor and carries out A/D sampling.
Claims (2)
1. a frequency converter three-phase output voltage Acquisition Circuit, is characterized in that, comprising:
High pressure attenuator circuit, for three phase converter is exported U, V, W carry out high-tension resistive decay to the pwm signal of N;
Calculus of differences circuit, is connected with described high pressure attenuator circuit, for three groups of pwm signals after decay are carried out calculus of differences;
Pressure sampling circuit, is connected with described calculus of differences circuit, for the signal after calculus of differences being carried out the dividing potential drop sampling of three kinds of ratios of each road signal;
Analog switching circuit, is connected with described pressure sampling circuit, and for 9 road signals after dividing potential drop being carried out the conversion of 6 kinds of knockdown simulating signal switches, the signal after conversion is carried out again the conversion of three kinds of combinations, conversion generates stairstep signal; And
Analog integrator circuit, is connected with described analog switching circuit, carries out A/D sampling for the signal generation simulating signal feeding processor after being changed by analog switch.
2. frequency converter three-phase output voltage Acquisition Circuit according to claim 1, is characterized in that: described high pressure attenuator circuit is for being connected to three phase converter output terminal U, the resistance in series of V, W, N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520018297.4U CN204405729U (en) | 2015-01-12 | 2015-01-12 | Frequency converter three-phase output voltage acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520018297.4U CN204405729U (en) | 2015-01-12 | 2015-01-12 | Frequency converter three-phase output voltage acquisition circuit |
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| Publication Number | Publication Date |
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| CN204405729U true CN204405729U (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520018297.4U Active CN204405729U (en) | 2015-01-12 | 2015-01-12 | Frequency converter three-phase output voltage acquisition circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579860A (en) * | 2020-05-25 | 2020-08-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting output voltage of frequency converter |
-
2015
- 2015-01-12 CN CN201520018297.4U patent/CN204405729U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111579860A (en) * | 2020-05-25 | 2020-08-25 | 青岛中加特电气股份有限公司 | Circuit device for collecting output voltage of frequency converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200911 Address after: 430223 D Workshop, No. 6, Polytechnic Park Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN GUIDE ELECTRIC DRIVE TECHNOLOGY Co.,Ltd. Address before: 430223 No. 6, science and engineering Park, science and engineering Park, East Lake New Technology Development Zone, Wuhan, Hubei Patentee before: WUHAN GUIDE ELECTRIC Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP03 | Change of name, title or address |
Address after: 430040 workshop D, no.6, ligongyuan Road, Science Park, Wuhan University of technology, Donghu Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Gangdi Technology Co.,Ltd. Address before: 430223 workshop D, no.6, ligongyuan Road, science and Technology Park, University of science and technology, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN GUIDE ELECTRIC DRIVE TECHNOLOGY Co.,Ltd. |
|
| CP03 | Change of name, title or address |