CN2896684Y - Digital pure sine-wave inverter - Google Patents
Digital pure sine-wave inverter Download PDFInfo
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- CN2896684Y CN2896684Y CN 200620041419 CN200620041419U CN2896684Y CN 2896684 Y CN2896684 Y CN 2896684Y CN 200620041419 CN200620041419 CN 200620041419 CN 200620041419 U CN200620041419 U CN 200620041419U CN 2896684 Y CN2896684 Y CN 2896684Y
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Abstract
The model utility discloses a digital pure sine wave converter and is characterized in that the model utility comprises one input circuit, one control circuit, one converting circuit and one filter circuit as well as one output circuit; the input of the converting circuit is connected with DC voltages through input circuit, the input port of this converting circuit is connected with the output port of the control circuit, the output port of the converting circuit is connected with the filter circuit and the output port of the filter circuit output voltages through output circuits; the AC voltages outputted by the filter circuit is feedback to the input port of the control circuit. DC voltage is input to the converting circuit to generate PWM wave forms, then the HF is filtered by the filter unit, the remaining LF sine waves are delivered through AC output. The model utility has a simple structure, the outputted AC wave form is pure sine wave, the output voltages and frequencies are stable and will not change with the changes of input voltages and loads.
Description
Technical field
The utility model belongs to digital inversion field, specifically a kind of Single-chip Controlling of using fully, direct current become that a voltage is stable, frequency stabilization, waveform be the digital pure sine wave inverter of pure sine wave.
Background technology
All kinds of in the market inverters are a lot.Some utilizes traditional analogy method, and the method for some numeral and simulation is also used.And really use digital method seldom.Use the digital method inversion to need very big amount of calculation, can be really and reach simultaneously that voltage is stable, frequency stabilization and waveform be characteristics such as pure sine wave.
Summary of the invention
The purpose of this utility model is to provide a kind of new digital pure sine wave inverter, and it uses Single-chip Controlling fully, and can enough considerably less amounts of calculation, reaches simultaneously that voltage is stable, frequency stabilization, waveform be characteristics such as pure sine wave.
The technical scheme that the utility model is taked is: digital pure sine wave inverter, be characterized in, and comprise an input circuit, a control circuit, an inverter circuit and a filter circuit and an output circuit; The input of described inverter circuit connects direct voltage by input circuit, the input of this inverter circuit also is connected with the output of control circuit, the output of inverter circuit connects filter circuit, and the output of this filter circuit is by the output circuit output AC voltage; Should feed back to the input of control circuit from the alternating voltage of filter circuit output.
Above-mentioned digital pure sine wave inverter, wherein, described control circuit comprises sampling unit, comparing unit, function amplitude selected cell, driver element and wave function unit and pedestal generator; The input of described sampling unit is connected with the alternating current of output circuit output; Described sampling unit, comparing unit and function amplitude selected cell are linked in sequence; The output of described function amplitude selected cell and wave function unit is connected with the input of driver element; The output of described driver element is connected with the output of inverter circuit; The output of described pedestal generator is connected with another input of comparing unit.
Above-mentioned digital pure sine wave inverter, wherein, described control circuit is made of a single-chip microcomputer.
Above-mentioned digital pure sine wave inverter, wherein, described inverter circuit is made of bridge circuit.By the time of each brachium pontis break-make of periodic variation, can output waveform be the alternating current of pure sine wave; The time of each brachium pontis break-make can exist the table of natural sines in the Single Chip Microcomputer (SCM) program memory to obtain by one.
Above-mentioned digital pure sine wave inverter, wherein, described inverter circuit is made of two pairs of field effect transistor parallel with one another, and the source electrode of every pair of field effect transistor is connected with drain electrode, and this tie point output is connected with filter circuit.
Above-mentioned digital pure sine wave inverter, wherein, described filter circuit is made of two inductance and the electric capacity that is connected in parallel on these two inductance output ends.
Because the utility model has adopted above technical scheme, the advantage of its generation is tangible:
One, the utility model utilizes a bridge inverter main circuit, by the time of each brachium pontis break-make of periodic variation, can output waveform be the alternating current of pure sine wave, rather than square wave or quasi-sine-wave.
The time of each brachium pontis break-make can exist the table of natural sines in the Single Chip Microcomputer (SCM) program memory to obtain by one.According to the numerical value of table of natural sines, the make-and-break time ratio of each brachium pontis is periodically changed from small to big, and more from large to small, the output of final inverter circuit just can obtain a voltage cycle ground and change from small to big, again power supply from large to small by after the low-pass filtering.This power source voltage variation obtains according to table of natural sines, so be pure sine wave.
Two, the utility model need not a large amount of calculating and just can obtain stable output voltage and frequency, and can not change with the variation of input voltage and load.
The program storage the inside of single-chip microcomputer is left a plurality of table of natural sines in order.Every form reduces or increases the amplitude of SIN function in order.Simultaneously, single-chip microcomputer is sampled to output voltage.If because extraneous factor made the output voltage step-down, the single-chip microcomputer SIN function form that can get a big one-level of amplitude replaces original form so.Otherwise the SIN function form that then can get a little one-level of amplitude replaces original form.Because the execution speed of single-chip microcomputer is subjected to the reaction speed of ectocine far away faster than output voltage.So the voltage of output is stable all the time.
In addition, the length of every form is identical, so the frequency of output waveform is exactly constant.
Because the output of voltage is the switching between form just, therefore do not need a large amount of calculating, thereby make the reaction speed of software faster, export more stable.
Description of drawings
Concrete characteristic performance of the present utility model is further described by following embodiment and accompanying drawing thereof.
Fig. 1 is the electrical block diagram of the utility model digital pure sine wave inverter.
Fig. 2 is the physical circuit figure of the utility model digital pure sine wave inverter.
Fig. 3 is the workflow diagram of the utility model digital pure sine wave inverter.
Embodiment
See also Fig. 1.The utility model digital pure sine wave inverter comprises an input circuit 1, a control circuit 2, an inverter circuit 3 and a filter circuit 4 and an output circuit 5.The input of inverter circuit connects direct voltage by input circuit, and the input of this inverter circuit also is connected with the output of control circuit, and the output of inverter circuit connects filter circuit, and the output of this filter circuit is by the output circuit output AC voltage; Should feed back to the input of control circuit from the alternating voltage of filter circuit output.
Described control circuit 2 is made of a single-chip microcomputer, uses the single-chip microcomputer that two above PWM delivery outlets are arranged just can finish the function of this control circuit, is the single-chip microcomputer of SST89E554RC such as model.This control circuit comprises sampling unit 21, comparing unit 22, function amplitude selected cell 23, driver element 24 and wave function unit 25 and pedestal generator 26.The input of sampling unit is connected with the alternating current of output circuit output; Sampling unit, comparing unit and function amplitude selected cell are linked in sequence; The output of function amplitude selected cell and wave function unit is connected with the input of driver element; The output of driver element is connected with the output of inverter circuit; The output of pedestal generator is connected with another input of comparing unit.Described control circuit
See also Fig. 2.The inverter circuit 3 of the utility model digital pure sine wave inverter is made of bridge circuit.By the time of each brachium pontis break-make of periodic variation, can output waveform be the alternating current of pure sine wave; The time of each brachium pontis break-make can exist the table of natural sines in the Single Chip Microcomputer (SCM) program memory to obtain by one.
In the present embodiment, described inverter circuit 3 is made of two couples of field effect transistor Q1 parallel with one another and Q2 and field effect transistor Q3 and Q4, and the source electrode of every pair of field effect transistor is connected with drain electrode, and this tie point output is connected with filter circuit.The drain electrode that the positive pole of direct current input is received field effect transistor Q1 and Q3, negative pole is received the source electrode of field effect transistor Q2 and Q4.Receive an end of inductance L 1 after the drain electrode of the source electrode of field effect transistor Q1 and field effect transistor Q2 links to each other, receive an end of inductance L 2 after the drain electrode of the source electrode of field effect transistor Q3 and field effect transistor Q4 links to each other.The other end of inductance L 1 and L2 is respectively with after the two ends of capacitor C link to each other, as the two ends that exchange output.The grid of field effect transistor Q1, Q2, Q3, Q4 is connected with single-chip microcomputer respectively.
The grid of field effect transistor Q1, Q2, Q3, Q4 receives the drive signal that single-chip microcomputer sends respectively.The drive signal of single-chip microcomputer is to obtain according to the data in the SIN function form.Control circuit is the software that is embedded in single-chip microcomputer, uses pointer in two function forms, and one begins to move to SIN function form tail from the SIN function head of form, and another is just in time opposite, begins to move to the SIN function head of form from SIN function form tail.All move data at every turn.The pulse signal of the numerical value institute duty ratio corresponding that first pointer takes out is delivered to field effect transistor Q1 and field effect transistor Q4, and the pulse signal of the numerical value institute duty ratio corresponding that another pointer takes out is delivered to field effect transistor Q2 and field effect transistor Q3.Like this, two groups of field effect transistor can take place complementally logical and disconnected.Behind the filter filtering of this signal by inductance L 1, L2 and capacitor C composition, just on two pin of output, produce the interchange output of a pure sinusoid waveform.
Please cooperate referring to Fig. 1.The utility model digital pure sine wave inverse method may further comprise the steps:
A, direct voltage is input to inverter circuit, produces the PWM waveform of high frequency, by filter unit HFS is filtered then, the sinusoidal wave part of remaining low frequency is sent by exchanging output; Described inverter circuit is a bridge circuit, by the time of each brachium pontis break-make of periodic variation, can output waveform be the alternating current of pure sine wave; The time of each brachium pontis break-make can be obtained by the table of natural sines of wave function unit storage.
The alternating voltage that b, interchange output are sent feeds back to the sampling unit of control circuit, and this sampling unit is sampled to output voltage, by comparing unit sampled voltage and reference voltage is compared then;
The result that c, function amplitude selected cell draw according to comparing unit selects the SIN function form of suitable amplitude to deliver to driver element;
The data of every bit of the SIN function of various amplitudes are being deposited in d, wave function unit; And these data are delivered to driver element one by one; The wave function unit is left a plurality of table of natural sines in order, and every form reduces or increase the amplitude of SIN function in order.When driver element is delivered to one by one with each table of natural sines data in described wave function unit, if because extraneous output voltage step-down, the SIN function form that can get a big one-level of amplitude so replaces original form; Otherwise the SIN function form that then can get a little one-level of amplitude replaces original form.
The output of e, driver element connects inversion unit, makes inversion unit pass through the driving of two groups of pwm signals, and the PWM waveform of generation high frequency, this waveform produce the interchange output of pure sinusoid waveform after filtering unit filters.Driver element is outside to be connected, and is exactly the grid of field effect transistor Q1, Q2, Q3, Q4.The PWM0 pin of single-chip microcomputer is received field effect transistor Q1 and field effect transistor Q4, and the PWM1 pin of single-chip microcomputer is received field effect transistor Q2 and field effect transistor Q3.Like this, two groups of field effect transistor are passed through the driving of two groups of pwm signals, produce the PWM waveform of high frequency, and this waveform just on two pin of ac output end, produces the interchange output of the pure sinusoid waveform of a stable amplitude after filtering unit filters.
The described function amplitude of step c selected cell comprises three variablees: one of them result that can draw according to comparing unit changes, its each numerical value correspondence the SIN function of the different amplitudes of each in the wave function, it is called as function amplitude pointer; In addition two the variation number that is subjected to data in each table of natural sines retrains, at first represent first data in the table of natural sines for one, represent second then, after it represents last data, represent penult more in the other direction, represent third from the bottom then, after it represents first data, repeat top action again.Another variable and it are just in time complementary, at first represent last data in the table of natural sines, represent penult then, and its change method is identical.This latter two variable is called pointer in the function table.
See also Fig. 3, this is the workflow diagram of the utility model digital pure sine wave inverter.
Step 1: function amplitude pointer initialize.
Step 2: begin sampling.Output voltage is sampled.
Does step 3: sampling finish? if do not finish, then repeat this step.If finish, then continue execution in step 4 downwards.
Step 4: sampling voltage overgauge voltage? if sampling voltage overgauge magnitude of voltage jumps to step 6 so.Otherwise, with regard to execution in step 5.
Step 5: is sampling voltage less than normal voltage? if sampling voltage less than standard voltage value, jumps to step 8 so.Otherwise, just jump to step 2.Carry out the sampling of next round.
Step 6: the form that has pointed to the amplitude minimum? if, then jump to step 2, carry out the sampling of next round.If not, then continue execution in step 7 downwards.
Step 7: function amplitude pointer subtracts one, the table of natural sines of the little one-level of selecting range.After executing this step, jump to step 2, carry out the sampling of next round.
Step 8: the form that has pointed to the amplitude maximum? if, then jump to step 2, carry out the sampling of next round.If not, then continue execution in step 9 downwards.
Step 9: function amplitude pointer adds one, the SIN function of the big one-level of selecting range.After executing this step, jump to step 2, carry out the sampling of next round.
Constantly repeat such work, just can make the output of device remain voltage stably.
When changing function amplitude pointer, the value of two interior pointers of function table keeps at every turn.They always move lattice by the direction of oneself at every turn.Like this, the output frequency of device also is stable.
The utility model circuit structure is simple, and the waveform of the alternating current of output is a pure sine wave, and the voltage of output and frequency stabilization can not change with the variation of input voltage and load.
Claims (6)
1, digital pure sine wave inverter is characterized in that, comprises an input circuit, a control circuit, an inverter circuit and a filter circuit and an output circuit; The input of described inverter circuit connects direct voltage by input circuit, the input of this inverter circuit also is connected with the output of control circuit, the output of inverter circuit connects filter circuit, and the output of this filter circuit is by the output circuit output AC voltage; Should feed back to the input of control circuit from the alternating voltage of filter circuit output.
2, digital pure sine wave inverter according to claim 1 is characterized in that, described control circuit comprises sampling unit, comparing unit, function amplitude selected cell, driver element and wave function unit and pedestal generator; The input of described sampling unit is connected with the alternating current of output circuit output; Described sampling unit, comparing unit and function amplitude selected cell are linked in sequence; The output of described function amplitude selected cell and wave function unit is connected with the input of driver element; The output of described driver element is connected with the output of inverter circuit; The output of described pedestal generator is connected with another input of comparing unit.
3, digital pure sine wave inverter according to claim 1 is characterized in that, described control circuit is made of a single-chip microcomputer.
4, digital pure sine wave inverter according to claim 1 is characterized in that, described inverter circuit is made of bridge circuit.By the time of each brachium pontis break-make of periodic variation, can output waveform be the alternating current of pure sine wave; The time of each brachium pontis break-make can exist the table of natural sines in the Single Chip Microcomputer (SCM) program memory to obtain by one.
5, digital pure sine wave inverter according to claim 4 is characterized in that, described inverter circuit is made of two pairs of field effect transistor parallel with one another, and the source electrode of every pair of field effect transistor is connected with drain electrode, and this tie point output is connected with filter circuit.
6, digital pure sine wave inverter according to claim 1 is characterized in that, described filter circuit is made of two inductance and the electric capacity that is connected in parallel on these two inductance output ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620041419 CN2896684Y (en) | 2006-04-28 | 2006-04-28 | Digital pure sine-wave inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620041419 CN2896684Y (en) | 2006-04-28 | 2006-04-28 | Digital pure sine-wave inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2896684Y true CN2896684Y (en) | 2007-05-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620041419 Expired - Lifetime CN2896684Y (en) | 2006-04-28 | 2006-04-28 | Digital pure sine-wave inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2896684Y (en) |
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2006
- 2006-04-28 CN CN 200620041419 patent/CN2896684Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20091202 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |