CN203859715U - Single-chip microcomputer-based frequency converter - Google Patents
Single-chip microcomputer-based frequency converter Download PDFInfo
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- CN203859715U CN203859715U CN201420233440.7U CN201420233440U CN203859715U CN 203859715 U CN203859715 U CN 203859715U CN 201420233440 U CN201420233440 U CN 201420233440U CN 203859715 U CN203859715 U CN 203859715U
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Abstract
The utility model discloses a single-chip microcomputer-based frequency converter. The frequency converter comprises an integrated circuit SA4828, a single-chip microcomputer 89C52, an isolation drive circuit, an inversion circuit IPM, and an electromotor. A given rotation speed is inputted through a keyboard. The single-chip microcomputer converts the rotation speed into a control word of frequency and voltage which are about to be outputted by the frequency converter, writes the control word into a control register of the integrated circuit SA4828, and initiates the integrated circuit SA4828. Six pins from RT to BB output SPWM control signals of the corresponding frequency and voltage. After being isolated via the drive circuit, the control signals respectively control the on-off states of six IGBTs of the intelligent power module IPM. Finally, symmetric three-phase SPWM voltage is generated in three output terminals to drive the AC electromotor to operate. By employing a rotating speed encoder, a closed-loop speed regulation system is formed, and the rotation speed control precision is improved. Fault detection signals of the IPM are connected to an STTRP terminal of the SA4828. Once the IPM has overcurrent, overheat, short-circuit, undervoltage, and other similar problems, the six paths of output signals of the SA4828 are cut off instantly so that the IPM can be protected.
Description
Technical field
The utility model relates to a kind of frequency converter, specifically a kind of SCM Based frequency converter.
Background technology
Alternating current motor, especially induction asynchtonous motor, have simple in structure, cheap, sturdy and durable, easy to maintenancely, can be operated in the medium outstanding advantage of rugged environment, more and more receives people's concern in servo drive system.Wherein, the most widely used variable-frequency control technique that surely belongs to, it is powered to alternating current motor with frequency converter.Frequency converter can be converted to the AC power of original fixed voltage and frequency the special AC power of variable voltage, variable frequency.Therefore, frequency converter has become the core component of AC speed regulating.
The amplitude that changes its voltage when wanting to accomplish to change ac power frequency, realizes speed regulation by constant torque, can adopt the method for SPWM of being called a kind of.With the sine wave of a low frequency, remove to modulate the leg-of-mutton carrier wave of a high frequency, obtain the not wide pulse of a string constant amplitude.Its inside includes a fundametal compoment and few harmonic wave.Change modulation wave frequency and amplitude, just can change frequency and the amplitude of the fundametal compoment in pulse train, also just realized the VVVF(pressure-variable variable ratio frequency changer of asynchronous motor) speed governing.
According to the operation principle of above-mentioned SPWM, in inverter, will be determined the switching time of switching tube by the intersection point of modulating wave and carrier wave.In modulation wave frequency, amplitude and year these three parameters of wave frequency, no matter which changes, all will the intersection point of carrier wave and modulating wave be changed.Therefore,, when frequency conversion is each time adjusted, all to recalculate the coordinate of intersection point.This is one group of transcendental equation, and the computing capability of single-chip microcomputer and speed are obviously difficult to be competent at.Past, the most frequently used way was, various frequencies and intersecting point coordinate corresponding to voltage are computed in advance, by the form of form, deposit, with time call by tabling look-up.To take the resource of a large amount of memory and CPU like this, make it cannot bring into play better effect.
Utility model content
The purpose of this utility model is to provide a kind of SCM Based frequency converter, to solve the problem proposing in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A SCM Based frequency converter, comprises integrated circuit SA4828, single-chip microcomputer 89C52, isolated drive circuit, inverter circuit IPM and motor, the P0 pin of described single-chip microcomputer 89C52, WR pin, RD pin, ALE pin, INT0 pin and P2 pin are connected the AD pin of integrated circuit SA4828 successively, WR pin, RD pin, ALE pin, ZPPR pin and CS pin, the input/output interface of described single-chip microcomputer 89C52 connects respectively A/D modular converter, display and keyboard, and the I/O pin of single-chip microcomputer 89C52 connects serial ports, by serial ports, connect host computer, by keyboard to single-chip microcomputer 89C52 input control frequency, by single-chip microcomputer 89C52 control integration circuit SA4828, motor is being carried out to frequency conversion, described integrated circuit SA4828 connects the three phase inverter bridge of isolated drive circuit, and the RT pin of integrated circuit SA4828, YT pin is connected the switching tube of three upper brachium pontis of three phase inverter bridge, the RB pin of described integrated circuit SA4828 with BY pin, YB pin is connected the switching tube of three lower brachium pontis of three phase inverter bridge with BB pin, described isolated drive circuit connects inverter circuit IPM, inverter circuit IPM connects motor, and the fault detection signal of described inverter circuit IPM connects the STTRP pin of integrated circuit SA4828, makes frequency converter protected.
As further program of the utility model: the VCC pin of the RST pin of described integrated circuit SA4828, VDD pin, MUX pin, RS pin and TRIP pin and single-chip microcomputer 89C52 is all connected the power supply that voltage is 5V.
As the utility model scheme further: connect by rotating speed decoder between described motor and integrated circuit SA4828.
Compared with prior art, the beneficial effects of the utility model are: by keyboard, input given rotating speed, single-chip microcomputer is converted into frequency that frequency converter will export and the control word of voltage it, is written to the control register of SA4828, starts SA4828; From 6 pins of RT ~ BB, export the SPWM control signal of corresponding frequencies and voltage, after drive circuit isolation, control respectively conducting and the cut-off of 6 IGBT of intelligent power module, finally on three outputs, produce symmetrical Three-phase SPWM voltage, to drive alternating current motor running; Utilize rotating speed coder can form Closed-Loop Speed Governing System, improve the precision that rotating speed is controlled.The fault detection signal of IPM is received the STTRP end of SA4828, once overcurrent, overheated, short circuit and the situation such as under-voltage occur IPM, will cut off immediately the 6 tunnel output signals of SA4828, and IPM is protected.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of SCM Based frequency converter, comprises integrated circuit SA4828, single-chip microcomputer 89C52, isolated drive circuit, inverter circuit IPM and motor, the P0 pin of described single-chip microcomputer 89C52, WR pin, RD pin, ALE pin, INT0 pin and P2 pin are connected the AD pin of integrated circuit SA4828 successively, WR pin, RD pin, ALE pin, ZPPR pin and CS pin, the input/output interface of described single-chip microcomputer 89C52 connects respectively A/D modular converter, display and keyboard, and the I/O pin of single-chip microcomputer 89C52 connects serial ports, by serial ports, connect host computer, by keyboard to single-chip microcomputer 89C52 input control frequency, by single-chip microcomputer 89C52 control integration circuit SA4828, motor is being carried out to frequency conversion, described integrated circuit SA4828 connects the three phase inverter bridge of isolated drive circuit, and the RT pin of integrated circuit SA4828, YT pin is connected the switching tube of three upper brachium pontis of three phase inverter bridge, the RB pin of described integrated circuit SA4828 with BY pin, YB pin is connected the switching tube of three lower brachium pontis of three phase inverter bridge with BB pin, described isolated drive circuit connects inverter circuit IPM, and inverter circuit IPM connects motor.
The fault detection signal of described inverter circuit IPM connects the STTRP pin of integrated circuit SA4828, makes frequency converter protected.
The VCC pin of the RST pin of described integrated circuit SA4828, VDD pin, MUX pin, RS pin and TRIP pin and single-chip microcomputer 89C52 is all connected the power supply that voltage is 5V.
Between described motor and integrated circuit SA4828, by rotating speed decoder, connect, thereby even if the rotating speed of feedback motor is conducive to variable frequency control accurately.
Operation principle of the present utility model is: by keyboard, input given rotating speed, single-chip microcomputer is converted into frequency that frequency converter will export and the control word of voltage it, is written to the control register of SA4828, starts SA4828; From 6 pins of RT ~ BB, export the SPWM control signal of corresponding frequencies and voltage, after drive circuit isolation, control respectively conducting and the cut-off of 6 IGBT of intelligent power module, finally on three outputs, produce symmetrical Three-phase SPWM voltage, to drive alternating current motor running; Utilize rotating speed coder can form Closed-Loop Speed Governing System, improve the precision that rotating speed is controlled.The fault detection signal of IPM is received the STTRP end of SA4828, once overcurrent, overheated, short circuit and the situation such as under-voltage occur IPM, will cut off immediately the 6 tunnel output signals of SA4828, and IPM is protected.
To those skilled in the art, obviously the utility model is not limited to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present utility model or essential characteristic, can realize the utility model with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims rather than above-mentioned explanation, is therefore intended to include in the utility model dropping on the implication that is equal to important document of claim and all changes in scope.Any Reference numeral in claim should be considered as limiting related claim.
In addition, be to be understood that, although this specification is described according to execution mode, but not each execution mode only comprises an independently technical scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should make specification as a whole, and the technical scheme in each embodiment also can, through appropriately combined, form other execution modes that it will be appreciated by those skilled in the art that.
Claims (3)
1. a SCM Based frequency converter, comprises integrated circuit SA4828, single-chip microcomputer 89C52, isolated drive circuit, inverter circuit IPM and motor, is characterized in that, the P0 pin of described single-chip microcomputer 89C52, WR pin, RD pin, ALE pin, INT0 pin and P2 pin are connected the AD pin of integrated circuit SA4828 successively, WR pin, RD pin, ALE pin, ZPPR pin and CS pin, the input/output interface of described single-chip microcomputer 89C52 connects respectively A/D modular converter, display and keyboard, and the I/O pin of single-chip microcomputer 89C52 connects serial ports, by serial ports, connect host computer, by keyboard to single-chip microcomputer 89C52 input control frequency, by single-chip microcomputer 89C52 control integration circuit SA4828, motor is being carried out to frequency conversion, described integrated circuit SA4828 connects the three phase inverter bridge of isolated drive circuit, and the RT pin of integrated circuit SA4828, YT pin is connected the switching tube of three upper brachium pontis of three phase inverter bridge, the RB pin of described integrated circuit SA4828 with BY pin, YB pin is connected the switching tube of three lower brachium pontis of three phase inverter bridge with BB pin, described isolated drive circuit connects inverter circuit IPM, and inverter circuit IPM connects motor, and the fault detection signal of described inverter circuit IPM connects the STTRP pin of integrated circuit SA4828.
2. a kind of SCM Based frequency converter according to claim 1, is characterized in that, the VCC pin of the RST pin of described integrated circuit SA4828, VDD pin, MUX pin, RS pin and TRIP pin and single-chip microcomputer 89C52 is all connected the power supply that voltage is 5V.
3. a kind of SCM Based frequency converter according to claim 1, is characterized in that, between described motor and integrated circuit SA4828, by rotating speed decoder, connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420233440.7U CN203859715U (en) | 2014-05-08 | 2014-05-08 | Single-chip microcomputer-based frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420233440.7U CN203859715U (en) | 2014-05-08 | 2014-05-08 | Single-chip microcomputer-based frequency converter |
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| CN203859715U true CN203859715U (en) | 2014-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420233440.7U Expired - Fee Related CN203859715U (en) | 2014-05-08 | 2014-05-08 | Single-chip microcomputer-based frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242595A (en) * | 2015-09-28 | 2016-01-13 | 深圳市易驱电气有限公司 | Switching device and switching method for analog input signals |
| CN112803850A (en) * | 2020-12-31 | 2021-05-14 | 天津瑞能电气有限公司 | Double-winding permanent magnet synchronous motor dragging control method |
-
2014
- 2014-05-08 CN CN201420233440.7U patent/CN203859715U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242595A (en) * | 2015-09-28 | 2016-01-13 | 深圳市易驱电气有限公司 | Switching device and switching method for analog input signals |
| CN105242595B (en) * | 2015-09-28 | 2018-05-15 | 深圳市易驱电气有限公司 | Switching device and switching method for analog input signals |
| CN112803850A (en) * | 2020-12-31 | 2021-05-14 | 天津瑞能电气有限公司 | Double-winding permanent magnet synchronous motor dragging control method |
| CN112803850B (en) * | 2020-12-31 | 2023-02-03 | 天津瑞能电气有限公司 | Double-winding permanent magnet synchronous motor dragging control method |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20141001 Termination date: 20160508 |
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| CF01 | Termination of patent right due to non-payment of annual fee |