CN105186905A - Method for controlling optically-coupled isolation single-stage buck-boost vehicle-mounted power inverter - Google Patents
Method for controlling optically-coupled isolation single-stage buck-boost vehicle-mounted power inverter Download PDFInfo
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- CN105186905A CN105186905A CN201510531449.5A CN201510531449A CN105186905A CN 105186905 A CN105186905 A CN 105186905A CN 201510531449 A CN201510531449 A CN 201510531449A CN 105186905 A CN105186905 A CN 105186905A
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Abstract
The invention discloses a method for controlling an optically-coupled isolation single-stage buck-boost vehicle-mounted power inverter. The control end of the switch tube of a vehicle-mounted power inverter is connected with an optically-coupled isolation circuit. Firstly, during the positive half cycle of sine waves, a first switch tube is controlled to be in the high-frequency switching state, while a second switch tube and a sixth switch tube are in the normally switched-on state. Meanwhile, a third switch tube and the first switch tube are in the complementary conducting state. After that, during the negative half cycle of sine waves, the third switch tube is controlled in the high-frequency switching state, while a fourth switch tube and a fifth switch tube are in the normally switched-on state. Meanwhile, the third switch tube and the first switch tube are in the complementary conducting state. At the same time, the on/off state of the optically-coupled isolation circuit is correspondingly controlled. Based on the above half-cycle modulation method, the switch tubes of two boost units are in the half-cycle high-frequency operation, while bypass switch tubes are in the power-frequency switching state. In this way, the switching loss of the inverter is reduced. At the same time, compared with the conventional control method, the conducting loss is reduced, and the internal circulation of a converter is eliminated.
Description
Technical field
The present invention relates to a kind of control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter, belong to AC/DC (DC/AC) device for converting electric energy.
Background technology
Inverter is widely used in motor and drives, uninterruption power source, induction heating, static state reactive generator and the occasion such as compensator and active power filtering.Traditional inverter circuit topology comprises voltage source inverter and current source inverter two class.
The output AC voltage of voltage source inverter is lower than DC bus-bar voltage, therefore voltage source inverter is a voltage-dropping type inverter in essence, in order to realize the function of boosting inverter, needing extra increase first class boost translation circuit, causing converter complicated integral structure.
Current source inverter is a booster type inverter in essence, in order to realize the function of decompression transformation, needing extra increase downconverter circuit, causing converter complicated integral structure; Current source inverter can only realize unidirectional power transfer, and energy can not two-way flow.
In order to solve the problems referred to above of voltage source inverter and current source inverter existence, scholar proposes the concept of Z-source inverter, converter main circuit and power supply is coupled together by introducing a Z source network.Compare with current source inverter with voltage source, the function that Z-source inverter can provide buck to convert, but the transmitted in both directions of energy can not be realized equally, introduce extra by inductance, the passive component of electric capacity composition, adds the volume of system simultaneously, weight and realize cost, controls complexity simultaneously.Propose again the Z-source inverter circuit of some remodeling both at home and abroad on this basis successively, its essence is all realize boosting by introducing passive component, all there are the problems referred to above.
Vehicle power has type, 1. inverter, is a kind ofly DC12V direct current to be converted to the AC220V alternating current identical with civil power, for general electrical equipment, is one power supply changeover device easily, gains the name owing to being usually used in automobile.2.DC/DC DC converter power supply, normally changes the direct currents such as 48VDC into 12VDC or 24VDC of automobile batteries and uses to the electric equipment on automobile.
Vehicle power is not only applicable to onboard system, as long as there is the occasion of DC12V DC power supply, all can use power inverter, DC12V is converted to AC220V alternating current, bring convenience to the life of people.Vehicle power fully takes into account outside environment for use, automatically will protect shutdown when there is overload or short circuit phenomenon.The output voltage of vehicle power can make voltage stabilization by the feedback acknowledgment of itself, and unloaded with specified magnitude of voltage change is less than 10V.It should be noted that, the object of vehicle power exports the voltage identical with civil power, meet the needs of electrical appliance, but what in fact vehicle power exported is analog sine, and civil power is real sine wave, both are slightly different, generally do not affect use, and this is the operation principle decision of vehicle power.
The inverter of single stage power converter is conducive to the lifting of power density and efficiency, and single stage type inverter has power stage and only has one-level, the advantages such as efficiency is high, and volume is little.The inverter of double-boost converter, adopts the two-way DC/DC converter differential output of two groups of independent symmetrical, obtains pure sinusoid alternating voltage.Common modulation system makes two groups of Boost respectively export a road to differ the voltage that 180 ° are with direct current biasings, obtains the ac output voltage of lifting press through differential output.The all power switchs of this modulation system downconverter are all in high frequency modulated state in whole power frequency period, and inductive current is large, switch tube voltage current stress is also larger, inductor loss, switching tube on-state loss and switching loss is caused to increase, there is inner circulation in whole converter simultaneously, is unfavorable for the lifting of efficiency.
Summary of the invention
Technical problem to be solved by this invention is: the control method providing a kind of light-coupled isolation single-stage lifting press vehicle mounted power inverter, solves the problem that in prior art, vehicle power switch tube voltage stress is large, ripple is strong.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter, described inverter comprises the first boosting unit, the second boosting unit, the first by-pass switch pipe, the second by-pass switch pipe, described first boosting unit comprises the first switching tube, second switch pipe, the first inductance, second boosting unit comprises the 3rd switching tube, the 4th switching tube, the second inductance, the control end of described switching tube connects optical coupling isolation circuit, comprises the steps:
Step 1, in the positive half period of sine wave, the optical coupling isolation circuit controlling the first switching tube and be connected with the first switching tube is in HF switch state, second switch pipe, the 6th switching tube and the optical coupling isolation circuit be connected with second switch pipe, the 6th switching tube are in normal open state, control the 3rd switching tube and the complementary conducting of the first switching tube;
Step 2, in the negative half-cycle of sine wave, the optical coupling isolation circuit controlling the 3rd switching tube and be connected with the 3rd switching tube is in HF switch state, 4th switching tube, the 5th switching tube and the optical coupling isolation circuit be connected with the 4th switching tube, the 5th switching tube are in normal open state, control the 3rd switching tube and the complementary conducting of the first switching tube;
Step 3, repetition step 1 are to step 2.
Described optical coupling isolation circuit comprises photoelectrical coupler, filter circuit, pull-up resistor, current-limiting resistance, described photoelectrical coupler comprises first input end, second input, first output, second output, wherein, first input end is connected with external dc power by current-limiting resistance, second input is connected with the signal output pin of external control chip, first output is divided into two-way, pull-up resistor of leading up to is connected with outside second DC power supply, the control end of another road connecting valve pipe, second output head grounding, second DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, and between each filter capacitor, at least differ an order of magnitude.
The capacitance of described three filter capacitors is respectively 0.01uf, 0.1uf, 1uf.
The resistance of described pull-up resistor is 1 kilo-ohm ~ 10 kilo-ohms, and the resistance of described current-limiting resistance is 50 Europe, Europe ~ 150.
Described switching tube comprises metal-oxide-semiconductor, triode or JFET.
Compared with prior art, the present invention has following beneficial effect:
1, apply half cycle modulation method, make the switching tube of two boosting units be in half cycle high-frequency work, by-pass switch plumber is switching state frequently, decreases the switching loss of inverter.Simultaneously compared with traditional control method, turn reduce conduction loss, eliminate the inside circulation of converter.
2, change range of input voltage is large, adopts coupling inductance, makes it possible to effectively suppress ripple, reduces the impact that device failure causes circuit, avoids short circuit.
3, topology is simple, and efficiency is high, and reliability is high.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of inverter of the present invention.
Fig. 2 is the schematic diagram of optical coupling isolation circuit of the present invention.
Embodiment
Below structure of the present invention and the course of work are described further.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
A kind of control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter, described inverter comprises the first boosting unit, the second boosting unit, the first by-pass switch pipe, the second by-pass switch pipe, described first boosting unit comprises the first switching tube, second switch pipe, the first inductance, second boosting unit comprises the 3rd switching tube, the 4th switching tube, the second inductance, the control end of described switching tube connects optical coupling isolation circuit, comprises the steps:
Step 1, in the positive half period of sine wave, the optical coupling isolation circuit controlling the first switching tube and be connected with the first switching tube is in HF switch state, second switch pipe, the 6th switching tube and the optical coupling isolation circuit be connected with second switch pipe, the 6th switching tube are in normal open state, control the 3rd switching tube and the complementary conducting of the first switching tube;
Step 2, in the negative half-cycle of sine wave, the optical coupling isolation circuit controlling the 3rd switching tube and be connected with the 3rd switching tube is in HF switch state, 4th switching tube, the 5th switching tube and the optical coupling isolation circuit be connected with the 4th switching tube, the 5th switching tube are in normal open state, control the 3rd switching tube and the complementary conducting of the first switching tube;
Step 3, repetition step 1 are to step 2.
Single-stage lifting press vehicle mounted power inverter of the present invention, as shown in Figure 1, comprise the first boosting unit, second boosting unit, first by-pass switch pipe S5, second by-pass switch pipe S6, described first boosting unit comprises the first switching tube S1, second switch pipe S2, first inductance, second boosting unit comprises the 3rd switching tube S3, 4th switching tube S4, second inductance, first inductance and the second inductance are coupling inductance, wherein, first inductance comprises the first winding L 1 and the second winding L 2, second inductance comprises tertiary winding L3 and the 4th winding L 4, first to fourth winding includes first end and the second end, the first end of the first winding L 1 and the first end Same Name of Ends each other of the second winding L 2, the first end of tertiary winding L3 and the first end Same Name of Ends each other of the 4th winding L 4, the first end of the first winding L 1 is connected with the positive pole of DC power supply Vin, second end of described second winding L 2 is connected with the input of the first switching tube S1, the output of second switch pipe S2 respectively, the output of the first switching tube S1 is connected with the output of the 3rd switching tube S3 respectively, the described first end of tertiary winding L3 is connected with the positive pole of DC power supply, and the second end of the 4th winding L 4 is connected with the input of the 3rd switching tube S3, the output of the 4th switching tube S4 respectively, the input of described 4th switching tube S4 is as the second output of this inverter, the input of the first by-pass switch pipe S5 is connected with the first output of this inverter, the output of the first by-pass switch pipe S5 is connected with the second end of the first winding L 1, the first end of the second winding L 2 respectively, the input of the second by-pass switch pipe S6 is connected with the second output of this inverter, the output of the second by-pass switch pipe S6 is connected with second end of tertiary winding L3, the first end of the 4th winding L 4 respectively.
Optical coupling isolation circuit of the present invention as shown in Figure 2, comprise photoelectrical coupler Q10, filter circuit, pull-up resistor R2, current-limiting resistance R1, described photoelectrical coupler Q10 comprises first input end, second input, first output, second output, wherein, first input end is connected with external dc power by current-limiting resistance R1, second input is connected with the signal output pin of external control chip, first output is divided into two-way, pull-up resistor R2 of leading up to is connected with outside second DC power supply, the control end of another road connecting valve pipe, second output head grounding, second DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, be respectively the first to the 3rd electric capacity C1 to C3, and between each filter capacitor, at least differ an order of magnitude.
The above is only some embodiments of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. the control method of a light-coupled isolation single-stage lifting press vehicle mounted power inverter, described inverter comprises the first boosting unit, the second boosting unit, the first by-pass switch pipe, the second by-pass switch pipe, described first boosting unit comprises the first switching tube, second switch pipe, the first inductance, second boosting unit comprises the 3rd switching tube, the 4th switching tube, the second inductance, the control end of described switching tube connects optical coupling isolation circuit, it is characterized in that: comprise the steps:
Step 1, in the positive half period of sine wave, the optical coupling isolation circuit controlling the first switching tube and be connected with the first switching tube is in HF switch state, second switch pipe, the 6th switching tube and the optical coupling isolation circuit be connected with second switch pipe, the 6th switching tube are in normal open state, control the 3rd switching tube and the complementary conducting of the first switching tube;
Step 2, in the negative half-cycle of sine wave, the optical coupling isolation circuit controlling the 3rd switching tube and be connected with the 3rd switching tube is in HF switch state, 4th switching tube, the 5th switching tube and the optical coupling isolation circuit be connected with the 4th switching tube, the 5th switching tube are in normal open state, control the 3rd switching tube and the complementary conducting of the first switching tube;
Step 3, repetition step 1 are to step 2.
2. the control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter according to claim 1, it is characterized in that: described optical coupling isolation circuit comprises photoelectrical coupler, filter circuit, pull-up resistor, current-limiting resistance, described photoelectrical coupler comprises first input end, second input, first output, second output, wherein, first input end is connected with external dc power by current-limiting resistance, second input is connected with the signal output pin of external control chip, first output is divided into two-way, pull-up resistor of leading up to is connected with outside second DC power supply, the control end of another road connecting valve pipe, second output head grounding, second DC power supply is connected filter circuit with between ground, described filter circuit comprises three the unequal filter capacitors of capacitance be connected in parallel, and between each filter capacitor, at least differ an order of magnitude.
3. the control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter according to claim 2, is characterized in that: the capacitance of described three filter capacitors is respectively 0.01uf, 0.1uf, 1uf.
4. the control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter according to claim 3, is characterized in that: the resistance of described pull-up resistor is 1 kilo-ohm ~ 10 kilo-ohms, and the resistance of described current-limiting resistance is 50 Europe, Europe ~ 150.
5. the control method of light-coupled isolation single-stage lifting press vehicle mounted power inverter according to claim 1, is characterized in that: described switching tube comprises metal-oxide-semiconductor, triode or JFET.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510531449.5A CN105186905A (en) | 2015-08-27 | 2015-08-27 | Method for controlling optically-coupled isolation single-stage buck-boost vehicle-mounted power inverter |
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| CN201510531449.5A CN105186905A (en) | 2015-08-27 | 2015-08-27 | Method for controlling optically-coupled isolation single-stage buck-boost vehicle-mounted power inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202356A (en) * | 2020-09-28 | 2021-01-08 | 天津津航计算技术研究所 | Boost-based quasi-Z-source single-stage isolation inverter topology circuit |
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| US20070076458A1 (en) * | 2005-09-30 | 2007-04-05 | Honeywell International, Inc. | Timing control circuit for lossless switching converter |
| CN101741273A (en) * | 2009-12-30 | 2010-06-16 | 扬州大学 | Coupling inductance type double Boost inverter circuits in photovoltaic system |
| CN101741240A (en) * | 2009-12-30 | 2010-06-16 | 广东易事特电源股份有限公司 | Topological structure of two-way DC/DC converter and converter |
| CN203734532U (en) * | 2013-12-25 | 2014-07-23 | 四川新力光源股份有限公司 | Chopper circuit used for LED driver |
| CN104104252A (en) * | 2014-06-30 | 2014-10-15 | 南京航空航天大学 | Single-stage buck-boost dual-Boost inverter and control method thereof |
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2015
- 2015-08-27 CN CN201510531449.5A patent/CN105186905A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070076458A1 (en) * | 2005-09-30 | 2007-04-05 | Honeywell International, Inc. | Timing control circuit for lossless switching converter |
| CN101741273A (en) * | 2009-12-30 | 2010-06-16 | 扬州大学 | Coupling inductance type double Boost inverter circuits in photovoltaic system |
| CN101741240A (en) * | 2009-12-30 | 2010-06-16 | 广东易事特电源股份有限公司 | Topological structure of two-way DC/DC converter and converter |
| CN203734532U (en) * | 2013-12-25 | 2014-07-23 | 四川新力光源股份有限公司 | Chopper circuit used for LED driver |
| CN104104252A (en) * | 2014-06-30 | 2014-10-15 | 南京航空航天大学 | Single-stage buck-boost dual-Boost inverter and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112202356A (en) * | 2020-09-28 | 2021-01-08 | 天津津航计算技术研究所 | Boost-based quasi-Z-source single-stage isolation inverter topology circuit |
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Application publication date: 20151223 |