CN103178732A - Precise inverter circuit - Google Patents
Precise inverter circuit Download PDFInfo
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- CN103178732A CN103178732A CN 201110429853 CN201110429853A CN103178732A CN 103178732 A CN103178732 A CN 103178732A CN 201110429853 CN201110429853 CN 201110429853 CN 201110429853 A CN201110429853 A CN 201110429853A CN 103178732 A CN103178732 A CN 103178732A
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Abstract
The invention relates to a power inverter circuit, in particular to a precise inverter circuit. The precise inverter circuit adopts an arithmetic unit 4 to output biphasic sine pulse width modulation (SPWM) signals, the SPWM signals and output square signals together control a controllable inverter bridge to work, output pulse voltage area is equal to area of selected output sine wave in a corresponding interval, and by changing frequency and amplitude of modulating wave, frequency and amplitude of output voltage of the inverter circuit can be adjusted. The voltage pulse series can greatly reduce higher harmonic components in load current.
Description
Technical field
The present invention relates to a kind of power inverse transformation circuit, particularly the accurate inverter circuit.
Background technology
At present, the needed baseline sinusoidal wave of inverter circuit produces circuit, useful analog circuit, useful single-chip microcomputer, the sine wave freuqency poor stability that analog circuit produces is subject to the impact of temperature; Monolithic processor controlled sine wave generation circuit is prone to the situation of program fleet, causes catastrophic result.
Secondly, break-make and the sinusoidal wave relation of controlling switching device in inverter circuit there are differences, and cause high order harmonic component.
Summary of the invention
The purpose of this invention is to provide a kind of power quality good, the accurate inverter circuit of noiseless output, good reliability.
The object of the present invention is achieved like this, the accurate inverter circuit, it is characterized in that: comprising: microprocessor, synchronous squarer, sine-wave generator, arithmetic unit, two-phase SPWM5, controlled inverter bridge, filter circuit, motor, voltage-current sensor, microprocessor with synchronize the input port of squarer and be electrically connected to, to control signal of synchronous squarer output, start the square-wave signal that synchronous squarer produces output, synchronous squarer divides two-way, one the tunnel is electrically connected to sine-wave generator, and another road is electrically connected to controlled inverter bridge; Frequency of sine-wave generator output is at the sine wave signal of 15 ~ 50Hz, the sine wave signal of 15 ~ 50Hz is delivered to arithmetic unit, arithmetic unit is controlled controlled inverter bridge work together with the square-wave signal of two-phase SPWM5 and above-mentioned output, the area of the pulse voltage of its output is equated with the area of sine wave in respective bins of desired output, modulate by change frequency and the amplitude that wave frequency and amplitude can be regulated the inverter circuit output voltage.
Controlled inverter bridge adopts the direct-current power supply bridge type inverting power supply of three-phase or single-phase rectifier output, controls controlled inverter bridge and comprises control circuit and inverter bridge.
Control circuit is made of door integrated circuit CD4081 and CD4069 inverter, CD4081 is 42 and inputs and door, wherein two 2 inputs consist of square wave input and SPMM input control with door A and B, A is connected wherein, and one tunnel input connection is connected with the SPMM negative input end afterwards with B, receive the control of SPMM negative input end, 2 inputs and a control of A other end reception SPMM positive input terminal, 2 inputs are connected square wave input with door B; 2 inputs and a door A output minute two-way lead up to 2 inputs and door C to drive the upper left pipe of inverter bridge, and another road is input to the input of 2 inputs and door D after the CD4069U1 inverter, are driven the lower-left pipe of inverter bridge by 2 inputs and door D; 2 inputs and a door B output minute two-way lead up to 2 inputs and door E to drive the upper right pipe of inverter bridge, and another road is input to the input of 2 inputs and door F after the CD4069U2 inverter, are driven the bottom right pipe of inverter bridge by 2 inputs and door F.
2 inputs have an integrating circuit that is made of RC with an input of door (C, D, E, F), are used for postponing or changing the inverter bridge ON time.
Inverter circuit comprises that 4 triodes (or metal-oxide-semiconductor) and 4 diodes consist of bridge circuit, 4 diodes are attempted by respectively in the emission and collector electrode of 4 triodes, a triode series connection in twos, after every two series connection, collector electrode fetches self-rectifying direct current anode, emitter fetches the direct current negative terminal of self-rectifying circuit output, and after every two series connection, wherein tie point forms two outputs and is electrically connected to filter circuit input.
Diode is attempted by respectively in the emission and collector electrode of 4 triodes, is that anode is electrically connected to emitter.
Controlled inverter bridge reverse frequency is the sine wave signal of 15 ~ 50Hz, and the sine wave signal of controlled inverter bridge output 15 ~ 50Hz enters filter circuit, and filter circuit is the LC filter circuit.
On the load power source of motor, voltage-current sensor is arranged, the A/D conversion that voltage-current sensor is transported to microprocessor 1 with the voltage that detects or electric current mouthful is analyzed and is processed by microprocessor, to determine to adjust the operating state of synchronous squarer.
The microprocessor work state comprises: start, shutdown comprise changing synchronous squarer operating state.
Advantage of the present invention is: due to the signal that adopts arithmetic unit 4 output two-phase SPWM, the signal of SPWM is controlled controlled inverter bridge work together with the square-wave signal of output, the area of the pulse voltage of its output is equated with the area of sine wave in respective bins of selected output, modulate by change frequency and the amplitude that wave frequency and amplitude can be regulated the inverter circuit output voltage, such potential pulse series can make the high order harmonic component composition in load current greatly reduce.
The invention will be further described below in conjunction with the embodiment accompanying drawing:
Description of drawings
Fig. 1 is embodiment of the present invention circuit theory diagrams;
Fig. 2 is the control circuit schematic diagram of the embodiment of the present invention;
Fig. 3 is embodiment of the present invention inverter circuit schematic diagram.
In figure, 1, microprocessor; 2, synchronous squarer; 3, sine-wave generator; 4, arithmetic unit; 5, two-phase SPWM; 6, controlled inverter bridge; 7, filter circuit; 8, motor; 9, voltage-current sensor.
Embodiment
As shown in Figure 1, the accurate inverter circuit, comprise: microprocessor 1, synchronous squarer 2, sine-wave generator 3, arithmetic unit 4, two-phase SPWM5, controlled inverter bridge 6, filter circuit 7, motor 8, voltage-current sensor 9, microprocessor 1 with synchronize the input port of squarer 2 and be electrically connected to, to control signal of synchronous squarer 2 outputs, start synchronous squarer 2 and produce the square-wave signal of output, synchronous 2 minutes two-way of squarer, one the tunnel is electrically connected to sine-wave generator 3, and another road is electrically connected to controlled inverter bridge 6; Frequency of sine-wave generator 3 outputs is at the sine wave signal of 15 ~ 50Hz, the sine wave signal of 15 ~ 50Hz is delivered to arithmetic unit 4, arithmetic unit 4 is controlled controlled inverter bridge 6 work together with the square-wave signal of two-phase SPWM5 and above-mentioned output, the area of the pulse voltage of its output is equated with the area of sine wave in respective bins of desired output, modulate by change frequency and the amplitude that wave frequency and amplitude can be regulated the inverter circuit output voltage, such potential pulse series can make the high order harmonic component composition in load current greatly reduce.
controlled inverter bridge 6 adopts the direct-current power supply bridge type inverting power supply of three-phase or single-phase rectifier output, control controlled inverter bridge 6 and comprise control circuit and inverter bridge, control circuit as shown in Figure 2, it is made of door integrated circuit CD4081 and CD4069 inverter, CD4081 is 42 and inputs and door, control circuit has been used 62 and has been inputted and door, therefore, need two CD4081, wherein two 2 inputs consist of square wave input and SPMM input control with door A and B, A is connected wherein, and one tunnel input connection is connected with the SPMM negative input end afterwards with B, receive the control of SPMM negative input end, 2 inputs and a control of A other end reception SPMM positive input terminal, 2 inputs are connected square wave input with door B.2 inputs and a door A output minute two-way lead up to 2 inputs and door C to drive the upper left pipe of inverter bridge, and another road is input to the input of 2 inputs and door D after the CD4069U1 inverter, are driven the lower-left pipe of inverter bridge by 2 inputs and door D; 2 inputs and a door B output minute two-way lead up to 2 inputs and door E to drive the upper right pipe of inverter bridge, and another road is input to the input of 2 inputs and door F after the CD4069U2 inverter, are driven the bottom right pipe of inverter bridge by 2 inputs and door F.
The input of 2 inputs and door C, a D, E, F has an integration that is made of RC
Circuit is used for postponing or changing the inverter bridge ON time.
Inverter circuit as shown in Figure 3, inverter circuit as shown in Figure 3, it comprises that 4 triodes (or metal-oxide-semiconductor) and 4 diodes consist of bridge circuit, 4 diodes are attempted by respectively in the emission and collector electrode of 4 triodes, a triode series connection in twos, after every two series connection, collector electrode fetches self-rectifying direct current anode, emitter fetches the direct current negative terminal of self-rectifying circuit output, and after every two series connection, wherein tie point forms two outputs and is electrically connected to filter circuit input.
Diode is attempted by respectively in the emission and collector electrode of 4 triodes, is that anode is electrically connected to emitter.
Controlled inverter bridge 6 reverse frequencies are sine wave signals of 15 ~ 50Hz, and the sine wave signal of controlled inverter bridge 6 output 15 ~ 50Hz enters filter circuit 7, and filter circuit is the LC filter circuit.Carry out further filtering by filter circuit 7, then control motor 8 work.
In order to obtain motor 8 work qualities (the electrical network net problem that the machine operation that causes due to power quality or online load cause), voltage-current sensor 9 is arranged on the load power source of motor 8, the A/D conversion that voltage-current sensor 9 is transported to microprocessor 1 with the voltage that detects or electric current mouthful, analyze and process by microprocessor 1, to determine to adjust the operating state of synchronous squarer 2.
Microprocessor 1 operating state comprises: start, shutdown comprise changing synchronous squarer 2 operating states.As synchronous squarer 2 frequency shifts, as changing between 15 ~ 50Hz.
Claims (9)
1. accurate inverter circuit, it is characterized in that: comprising: microprocessor, synchronous squarer, sine-wave generator, arithmetic unit, two-phase SPWM5, controlled inverter bridge, filter circuit, motor, voltage-current sensor, microprocessor with synchronize the input port of squarer and be electrically connected to, to control signal of synchronous squarer output, start the square-wave signal that synchronous squarer produces output, synchronous squarer divides two-way, one the tunnel is electrically connected to sine-wave generator, and another road is electrically connected to controlled inverter bridge; Frequency of sine-wave generator output is at the sine wave signal of 15 ~ 50Hz, the sine wave signal of 15 ~ 50Hz is delivered to arithmetic unit, arithmetic unit is controlled controlled inverter bridge work together with the square-wave signal of two-phase SPWM5 and above-mentioned output, the area of the pulse voltage of its output is equated with the area of sine wave in respective bins of desired output, modulate by change frequency and the amplitude that wave frequency and amplitude can be regulated the inverter circuit output voltage.
2. accurate inverter circuit according to claim 1 is characterized in that: controlled inverter bridge adopts the direct-current power supply bridge type inverting power supply of three-phase or single-phase rectifier output, controls controlled inverter bridge and comprises control circuit and inverter bridge.
3. accurate inverter circuit according to claim 2, it is characterized in that: control circuit is made of door integrated circuit CD4081 and CD4069 inverter, CD4081 is 42 and inputs and door, wherein two 2 inputs consist of square wave input and SPMM input control with door A and B, A is connected wherein, and one tunnel input connection is connected with the SPMM negative input end afterwards with B, receive the control of SPMM negative input end, 2 inputs and a control of A other end reception SPMM positive input terminal, 2 inputs are connected square wave input with door B; 2 inputs and a door A output minute two-way lead up to 2 inputs and door C to drive the upper left pipe of inverter bridge, and another road is input to the input of 2 inputs and door D after the CD4069U1 inverter, are driven the lower-left pipe of inverter bridge by 2 inputs and door D; 2 inputs and a door B output minute two-way lead up to 2 inputs and door E to drive the upper right pipe of inverter bridge, and another road is input to the input of 2 inputs and door F after the CD4069U2 inverter, are driven the bottom right pipe of inverter bridge by 2 inputs and door F.
4. accurate inverter circuit according to claim 3 is characterized in that: an input of 2 inputs and door (C, D, E, F) has an integrating circuit that is made of RC, is used for postponing or changing the inverter bridge ON time.
5. accurate inverter circuit according to claim 1, it is characterized in that: inverter circuit comprises that 4 triodes (or metal-oxide-semiconductor) and 4 diodes consist of bridge circuit, 4 diodes are attempted by respectively in the emission and collector electrode of 4 triodes, a triode series connection in twos, after every two series connection, collector electrode fetches self-rectifying direct current anode, and emitter fetches the direct current negative terminal of self-rectifying circuit output, and after every two series connection, wherein tie point forms two outputs and is electrically connected to filter circuit input.
6. accurate inverter circuit according to claim 5, it is characterized in that: diode is attempted by respectively in the emission and collector electrode of 4 triodes, is that anode is electrically connected to emitter.
7. accurate inverter circuit according to claim 1, it is characterized in that: controlled inverter bridge reverse frequency is the sine wave signal of 15 ~ 50Hz, and the sine wave signal of controlled inverter bridge output 15 ~ 50Hz enters filter circuit, and filter circuit is the LC filter circuit.
8. accurate inverter circuit according to claim 1, it is characterized in that: on the load power source of motor, voltage-current sensor is arranged, the A/D conversion that voltage-current sensor is transported to microprocessor 1 with the voltage that detects or electric current mouthful, analyze and process by microprocessor, to determine to adjust the operating state of synchronous squarer.
9. accurate inverter circuit according to claim 1, it is characterized in that: the microprocessor work state comprises: start, shut down, comprise changing synchronous squarer operating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110429853 CN103178732A (en) | 2011-12-20 | 2011-12-20 | Precise inverter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110429853 CN103178732A (en) | 2011-12-20 | 2011-12-20 | Precise inverter circuit |
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|---|---|
| CN103178732A true CN103178732A (en) | 2013-06-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110429853 Pending CN103178732A (en) | 2011-12-20 | 2011-12-20 | Precise inverter circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525104A (en) * | 2018-10-09 | 2019-03-26 | 三英精控（天津）仪器设备有限公司 | The adjustable AC/DC universal power supply of frequency amplitude |
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2011
- 2011-12-20 CN CN 201110429853 patent/CN103178732A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109525104A (en) * | 2018-10-09 | 2019-03-26 | 三英精控（天津）仪器设备有限公司 | The adjustable AC/DC universal power supply of frequency amplitude |
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Application publication date: 20130626 |