CN202565193U - Inverter control circuit of sine-wave vehicle-mounted inverter and vehicle-mounted inverter - Google Patents
Inverter control circuit of sine-wave vehicle-mounted inverter and vehicle-mounted inverter Download PDFInfo
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- CN202565193U CN202565193U CN2012200431738U CN201220043173U CN202565193U CN 202565193 U CN202565193 U CN 202565193U CN 2012200431738 U CN2012200431738 U CN 2012200431738U CN 201220043173 U CN201220043173 U CN 201220043173U CN 202565193 U CN202565193 U CN 202565193U
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Abstract
The utility model relates to an inverter control circuit of a sine-wave vehicle-mounted inverter and a vehicle-mounted inverter. The inverter control circuit comprises a voltage detection circuit, a current detection circuit, a voltage correction module, an SPWM wave generating module and a driving circuit, wherein the voltage detection circuit and the current detection circuit are connected with the direct-current input end of a DC/AC inverter circuit of a sine-wave vehicle-mounted inverter, and send the detected direct-current input voltage and the direct-current current to the voltage correction module respectively; and the voltage correction module sends the direct-current input voltage correction value of the detected direct-current input current to the SPWM wave generating module, thus calculating and outputting an SPWM wave-giving driving circuit and driving the DC/AC inverter circuit to be convert the direct current into the stable alternating current. The inverter control circuit of sine-wave vehicle-mounted inverter and the vehicle-mounted inverter utilize the direct-current voltage feedforward control and the direct current compensation regulation to stabilize the output alternating-current voltage, and have no requirement for complicated alternating-current voltage detection calculation and proportional integral calculation, thus saving resource, being stable in output, and being reliable in work.
Description
Technical field
The utility model relates to vehicle-mounted inverter technology field, more particularly, relates to the inverter control circuit and the corresponding sinusoidal wave vehicle-mounted inverter of the vehicle-mounted inverter of a kind of sine wave.
Background technology
The module frame chart of existing vehicle-mounted inverter is as shown in Figure 1; Comprise DC filtering circuit 10, DC/DC booster circuit 20, DC/AC inverter circuit 30 and ac filter circuit 40, and the inverter control circuit 60 that is used to produce the boost control circuit 50 of PWM ripple control DC/DC booster circuit 20 and is used to produce SPWM ripple control DC/AC inverter circuit 30.Direct current input back elder generation process DC filtering circuit 10 is to reduce ripple current and to suppress electromagnetic interference; Through DC/DC booster circuit 20 DC12V or DC24V are transformed to HVDC again; Through DC/AC inverter circuit 30 HVDC is converted to the square wave of SPWM Sine Wave Pulse Width Modulation then; Through the sine wave AC voltage of ac filter circuit 40 output AC220V/50Hz or AC110V/60Hz, export this alternating voltage at last as passing through single-phase socket.
As shown in Figure 2, inverter control circuit 60 specifically comprises output voltage detecting circuit 67, inversion microcontroller 68 and drive circuit 69.Output voltage detecting circuit 67 connects the ac output end of ac filter circuit 40; Ac output voltage is fed back to inversion microcontroller 68; Inversion microcontroller 68 transmits control signal the SPWM ripple to the 30 realization DC/AC inversions of DC/AC inverter circuit through overdrive circuit 69 according to the pulse duration of the SPWM ripple of the size calculating output of ac output voltage.When detecting ac output voltage and be lower than set point, inversion microcontroller 68 increases the pulse duration of SPWM ripples, and ac output voltage is raise; When detecting ac output voltage and be higher than set point, inversion microcontroller 68 reduces the pulse duration of SPWM ripple, and ac output voltage is descended, and promptly regulates the pulse duration of the SPWM ripple of output automatically, thereby makes ac output voltage keep stable.This process is specifically as shown in Figure 3, and inversion microcontroller 68 calculates the SPWM ripple index of modulation and SPWM ripple duty ratio according to the ac output voltage actual value and the ac output voltage set point of feedback, exports the SPWM ripple then.
Yet; In such scheme, at first to accurately measure the size of the effective value of ac output voltage; And the sampling of the effective value of ac output voltage calculating is comparatively difficult, and enough sampling numbers not only will be arranged, and inversion microcontroller 68 also will carry out a large amount of calculating.Calculate effective value again if detect the peak value of ac output voltage, receive the influence of sampling number and output waveform, can there be error in testing result.When carrying out proportional plus integral control, need to set suitable proportionality coefficient and integral coefficient simultaneously, otherwise when input voltage variation and load variations, overshoot or oscillatory occurences can occur, make output voltage unstable.
The utility model content
The technical problem that the utility model will solve is, the comparatively complicated defective of computing during to the inverter control circuit output SPWM ripple of existing vehicle-mounted inverter provides the inverter control circuit and the corresponding vehicle-mounted inverter of the vehicle-mounted inverter of a kind of sine wave.
The utility model solves the technical scheme that its technical problem adopted: construct the inverter control circuit of the vehicle-mounted inverter of a kind of sine wave, comprise voltage detecting circuit, current detection circuit, voltage correcting module, SPWM ripple generating module and drive circuit;
Said voltage detecting circuit links to each other with the direct-flow input end of current detection circuit with the DC/AC inverter circuit of the vehicle-mounted inverter of sine wave, respectively the DC input voitage and the direct current input current that detect is sent to the voltage correcting module;
Said voltage correcting module links to each other with current detection circuit with said voltage detecting circuit, will send to SPWM ripple generating module according to the DC input voitage correction value of said direct current input current correction;
Said SPWM ripple generating module links to each other with said voltage correcting module, will calculate the DC/AC inverter circuit that the SPWM ripple that produces sends to the sinusoidal wave vehicle-mounted inverter of said driving circuit drives according to DC input voitage correction value and output AC voltage set point.
In the inverter control circuit of the vehicle-mounted inverter of described sine wave according to the utility model, said voltage correcting module and SPWM ripple generating module are integrated in the inversion microcontroller.
In the inverter control circuit of the vehicle-mounted inverter of described sine wave according to the utility model; Said current detection circuit comprises the first amplifier IC, resistance R 8-R11 and capacitor C 4-C5; The positive input of the said first amplifier IC links to each other with the direct current detection end of said DC/AC inverter circuit through resistance R 9; And the positive input of the first amplifier IC is through capacitor C 4 ground connection; The reverse input end of the said first amplifier IC is through resistance R 8 ground connection; Be connected with resistance R 10 between the reverse input end of the said first amplifier IC and the signal output part, the signal output part of the said first amplifier IC is through resistance R 11 and capacitor C 5 ground connection, and the node between said resistance R 11 and the capacitor C 5 inserts said inversion microcontroller.
In the inverter control circuit of the vehicle-mounted inverter of described sine wave according to the utility model, said voltage correcting module further comprises: line drop computing unit and subtracter; Said line drop computing unit links to each other with said current detecting unit, will send to subtracter according to the line drop of said direct current input current and line impedance calculating; Said subtracter links to each other with voltage detection unit with said line drop computing unit, and the difference of said DC input voitage and line drop is sent to said SPWM ripple generating module as the DC input voitage correction value.
The utility model also provides a kind of sine wave vehicle-mounted inverter; Comprise DC filtering circuit, DC/DC booster circuit, DC/AC inverter circuit, ac filter circuit and boost control circuit, and the inverter control circuit of the vehicle-mounted inverter of aforesaid sine wave.
Implement the inverter control circuit and the corresponding sinusoidal wave vehicle-mounted inverter of the sinusoidal wave vehicle-mounted inverter of the utility model; Have following beneficial effect: the utility model is delivered to the voltage correcting module through voltage detecting circuit and current detection circuit with the DC input voitage and the direct current input current signal of DC/AC inverter circuit; The voltage correcting module will be according to the direct current input current correction DC input voitage that detects; Send the DC input voitage correction value and give SPWM ripple generating module, calculate and export the SPWM ripple and give driving circuit drives DC/AC inverter circuit; The utility model has changed existing vehicle-mounted inverter output voltage feedback mode control; But adopt the direct voltage feedfoward control to add direct current compensated regulation output voltage; Do not need complicated alternating voltage detection computations and proportional integral computing, the resource that can save microcontroller; And response is fast, output voltage hyperharmonic vibration can not occur, and output is stable, reliable operation.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the module frame chart of existing vehicle-mounted inverter;
Fig. 2 is the concrete block diagram of inverter control circuit in the existing vehicle-mounted inverter;
Fig. 3 is the process sketch map that the SPWM ripple of inverter control circuit in the existing vehicle-mounted inverter takes place;
Fig. 4 is the module frame chart according to the inverter control circuit of the sinusoidal wave vehicle-mounted inverter of the utility model;
Fig. 5 is the schematic diagram according to the partial circuit of the sinusoidal wave vehicle-mounted inverter of the utility model;
Fig. 6 is the physical circuit figure according to the inverter control circuit of the sinusoidal wave vehicle-mounted inverter of the utility model.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.
See also Fig. 4, be module frame chart according to the voltage stabilizing inverter control circuit of the sinusoidal wave vehicle-mounted inverter of the utility model.As shown in Figure 4, the inverter control circuit 60 of the vehicle-mounted inverter of this sine wave comprises voltage detecting circuit 61, current detection circuit 62, voltage correcting module 63, SPWM ripple generating module 64 and drive circuit 69 at least.And the circuit of sinusoidal wave vehicle-mounted inverter is as shown in fig. 1; Comprise DC filtering circuit 10, DC/DC booster circuit 20, DC/AC inverter circuit 30 and ac filter circuit 40; And the inverter control circuit 60 that is used to produce the boost control circuit 50 of PWM ripple control DC/DC booster circuit 20 and is used to produce SPWM ripple control DC/AC inverter circuit 30, this inverter control circuit 60 adopts inverter control circuit 60 as shown in Figure 4.
Wherein, Voltage detecting circuit 61 links to each other with the direct-flow input end of current detection circuit 62 with the DC/AC inverter circuit 30 of the vehicle-mounted inverter of sine wave, and DC input voitage and the direct current input current with the DC/AC inverter circuit 30 that detects sends to voltage correcting module 63 respectively.HVDC after DC/DC booster circuit 20 will boost offers DC/AC inverter circuit 30, and voltage detecting circuit 61 detects this DC input voitage, and current detection circuit 62 detects this direct current input current.
As shown in Figure 4, the voltage correcting module may further include: line drop computing unit and subtracter.Wherein, the line drop computing unit links to each other with current detecting unit 62, will send to subtracter according to the line drop of direct current input current and line impedance calculating.Subtracter links to each other with voltage detection unit 61 with the line drop computing unit, and the difference of DC input voitage and line drop is sent to SPWM ripple generating module 64 as the DC input voitage correction value.
SPWM ripple generating module 64 links to each other with voltage correcting module 63; Load the DC input voitage correction value that voltage correcting module 63 sends; And calculate the pulse duty factor of confirming the SPWM ripple according to ac output voltage set point and DC input voitage correction value, and the corresponding SPWM ripple of output is given drive circuit 69.In the utility model, the SPWM ripple that SPWM ripple generating module 64 produces carries out signal through drive circuit 69 and amplifies the 30 realization DC/AC inversions of rear drive DC/AC inverter circuit.
To the explanation of the utility model ac output voltage voltage stabilizing control mode as follows: because the size of ac output voltage is the duty ratio decision by the size of the DC input voitage before 30 inversions of DC/AC inverter circuit and the SPWM ripple of control inversion; As long as therefore measure the DC input voitage before the inversion, just can calculate and satisfy the required SPWM ripple duty ratio of inversion output AC voltage effective value.Consider that the load current size can exert an influence to output voltage, this is because when SPWM ripple duty ratio is constant, with respect to zero load; Load current can produce line drop; Comprise FET, the inductance in the ac filter circuit 40 and the pressure drop of circuit in the DC/AC inverter circuit 30, output voltage is reduced, and load is big more; Line drop is big more, and output voltage reduces many more.Through measuring the direct current input current and the line impedance of DC/AC inverter circuit 30; Calculate line drop; The DC input voitage that detects is deducted line drop obtain the DC input voitage correction value; Duty ratio according to DC input voitage correction value calculating SPWM ripple makes output voltage can both keep stable in different DC input voitages, different loads size.When DC input voitage changed, voltage correcting module 63 output voltages changed, and SPWM ripple generating module 64 is calculated the change in duty cycle of the SPWM ripple of output, and when promptly DC input voitage reduced, the DC input voitage correction value also reduced, and the duty ratio of SPWM ripple increases; When DC input voitage increased, the DC input voitage correction value also increased, and the duty ratio of SPWM ripple reduces; No matter DC input voitage increases or reduces, ac output voltage is constant in a word, keeps stable; Promptly realize electric voltage feed forward control, had the fast advantage of response speed.When load variations; The direct current input current changes, and the DC input voitage correction value of voltage correcting module 63 outputs changes, and SPWM ripple generating module 64 is calculated the change in duty cycle of the SPWM ripple of output; When being the load increase; The direct current input current increases, and the DC input voitage correction value reduces, and the duty ratio of SPWM ripple increases; When load reduced, the direct current input current reduced, and the DC input voitage correction value increases; The duty ratio of SPWM ripple reduces, no matter load increases or reduces, ac output voltage is constant in a word; Promptly regulate through current compensation, ac output voltage can keep stable equally during load variations.
See also Fig. 5, be partial circuit schematic diagram according to the sinusoidal wave vehicle-mounted inverter of the utility model.As shown in Figure 5, after boosting low-voltage dc signal, the transformer of DC/DC booster circuit 20 passes through rectifier bridge by transformer output T-1 and T-2 output, and promptly diode D1-D4 inputs to electric capacity E1, to offer DC/AC inverter circuit 30.DC/AC inverter circuit 30 mainly comprises the H shape bridge inverter main circuit of being made up of FET M1-M4, respectively by control signal M1G-M4G its conducting of control and disconnection.Ac filter circuit 40 is made up of filter inductance L1 and filter capacitor C2, and the alternating voltage of inversion is exported through ac voltage output AC1 and AC2.
The direct voltage test side VSDC of DC/AC inverter circuit 30 is the positive pole of electric capacity E1; Current sampling resistor RS is connected under negative pole and the inverter circuit of electric capacity E1 between the brachium pontis common port, and is connected with filter capacitor C1 between direct current detection end VCT2 and the direct voltage test side VSDC.
See also Fig. 6, be physical circuit figure according to the voltage stabilizing inverter control circuit of the sinusoidal wave vehicle-mounted inverter of the utility model.As shown in Figure 6, the voltage correcting module 63 in the utility model can be integrated in the inversion microcontroller 68 with SPWM ripple generating module 64 and realize.
The utility model is also corresponding to provide a kind of sine wave vehicle-mounted inverter; Comprise DC filtering circuit as shown in Figure 1, DC/DC booster circuit, DC/AC inverter circuit, ac filter circuit and boost control circuit, the vehicle-mounted inverter of this sine wave also comprises the inverter control circuit of the vehicle-mounted inverter of aforesaid sine wave.This inverter control circuit can adopt the theory diagram shown in Fig. 4 to realize.
To sum up, the key problem in technology of the utility model point is to change the vehicle-mounted inverter output voltage feedback mode control of existing sine wave, makes output voltage keep stable but adopt the direct voltage feedfoward control to add the direct current compensated regulation.The utility model technical scheme does not need complicated alternating voltage detection computations and proportional integral computing, the resource that can save microcontroller.Simultaneously, electric voltage feed forward control and current compensation that the present technique scheme adopts are regulated, and dynamic response is fast, output voltage hyperharmonic vibration can not occur, and output is stable, reliable operation.
The utility model is described according to specific embodiment, but it will be understood by those skilled in the art that when not breaking away from the utility model scope, can carry out various variations and be equal to replacement.In addition, for adapting to the specific occasion of the utility model technology, can carry out many modifications and not break away from its protection range the utility model.Therefore, the utility model is not limited to specific embodiment disclosed herein, and comprises that all drop into the embodiment of claim protection range.
Claims (5)
1. the inverter control circuit of the vehicle-mounted inverter of sine wave is characterized in that, comprises voltage detecting circuit, current detection circuit, voltage correcting module, SPWM ripple generating module and drive circuit;
Said voltage detecting circuit links to each other with the direct-flow input end of current detection circuit with the DC/AC inverter circuit of the vehicle-mounted inverter of sine wave, respectively the DC input voitage and the direct current input current that detect is sent to the voltage correcting module;
Said voltage correcting module links to each other with current detection circuit with said voltage detecting circuit, will send to SPWM ripple generating module according to the DC input voitage correction value of said direct current input current correction;
Said SPWM ripple generating module links to each other with said voltage correcting module, will calculate the DC/AC inverter circuit that the SPWM ripple that produces sends to the sinusoidal wave vehicle-mounted inverter of said driving circuit drives according to DC input voitage correction value and output AC voltage set point.
2. the inverter control circuit of the vehicle-mounted inverter of sine wave according to claim 1 is characterized in that, said voltage correcting module and SPWM ripple generating module are integrated in the inversion microcontroller.
3. the inverter control circuit of the vehicle-mounted inverter of sine wave according to claim 2; It is characterized in that; Said current detection circuit comprises the first amplifier IC, resistance R 8-R11 and capacitor C 4-C5; The positive input of the said first amplifier IC links to each other with the direct current detection end of said DC/AC inverter circuit through resistance R 9; And the positive input of the first amplifier IC is through capacitor C 4 ground connection, and the reverse input end of the said first amplifier IC is connected with resistance R 10 through resistance R 8 ground connection between the reverse input end of the said first amplifier IC and the signal output part; The signal output part of the said first amplifier IC is through resistance R 11 and capacitor C 5 ground connection, and the node between said resistance R 11 and the capacitor C 5 inserts said inversion microcontroller.
4. the inverter control circuit of the vehicle-mounted inverter of sine wave according to claim 1 is characterized in that, said voltage correcting module further comprises: line drop computing unit and subtracter;
Said line drop computing unit links to each other with said current detecting unit, will send to subtracter according to the line drop of said direct current input current and line impedance calculating;
Said subtracter links to each other with voltage detection unit with said line drop computing unit, and the difference of said DC input voitage and line drop is sent to said SPWM ripple generating module as the DC input voitage correction value.
5. vehicle-mounted inverter of sine wave; It is characterized in that; Comprise DC filtering circuit, DC/DC booster circuit, DC/AC inverter circuit, ac filter circuit and boost control circuit, and the inverter control circuit of any vehicle-mounted inverter of described sine wave among the claim 1-4.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200431738U CN202565193U (en) | 2012-02-10 | 2012-02-10 | Inverter control circuit of sine-wave vehicle-mounted inverter and vehicle-mounted inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200431738U CN202565193U (en) | 2012-02-10 | 2012-02-10 | Inverter control circuit of sine-wave vehicle-mounted inverter and vehicle-mounted inverter |
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| Publication Number | Publication Date |
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| CN202565193U true CN202565193U (en) | 2012-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200431738U Withdrawn - After Issue CN202565193U (en) | 2012-02-10 | 2012-02-10 | Inverter control circuit of sine-wave vehicle-mounted inverter and vehicle-mounted inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248258A (en) * | 2012-02-10 | 2013-08-14 | 美固电子(深圳)有限公司 | Vehicle-mounted sine wave inverter and inversion control circuit thereof |
| CN113285643A (en) * | 2021-05-13 | 2021-08-20 | 青岛海信日立空调***有限公司 | Household appliance |
-
2012
- 2012-02-10 CN CN2012200431738U patent/CN202565193U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248258A (en) * | 2012-02-10 | 2013-08-14 | 美固电子(深圳)有限公司 | Vehicle-mounted sine wave inverter and inversion control circuit thereof |
| CN103248258B (en) * | 2012-02-10 | 2015-07-08 | 美固电子(深圳)有限公司 | Vehicle-mounted sine wave inverter and inversion control circuit thereof |
| CN113285643A (en) * | 2021-05-13 | 2021-08-20 | 青岛海信日立空调***有限公司 | Household appliance |
| CN113285643B (en) * | 2021-05-13 | 2022-03-04 | 青岛海信日立空调***有限公司 | Household appliance |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121128 Effective date of abandoning: 20150708 |
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| RGAV | Abandon patent right to avoid regrant |