CN107592028B - Inverter circuit system - Google Patents
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- CN107592028B CN107592028B CN201710785150.1A CN201710785150A CN107592028B CN 107592028 B CN107592028 B CN 107592028B CN 201710785150 A CN201710785150 A CN 201710785150A CN 107592028 B CN107592028 B CN 107592028B
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Abstract
The invention discloses an inverter circuit system which comprises a power supply battery, a first processing chip, a second processing chip, a DC-AC module, a transformer, an AC-DC module, an inversion module, an isolation communication module, an isolation driving module and an auxiliary power supply, wherein the power supply battery is connected with the first processing chip; the inversion module is a full-bridge inverter topological structure comprising 4 first MOS tubes, and the second processing chip is respectively connected with the grids of the 4 first MOS tubes through the isolation driving module. The second processing chip controls and drives the first MOS tube in the inverter module through the isolation driving module, and when the first MOS tube is switched on and switched off at high frequency, the influence generated by parasitic parameters of the first MOS tube cannot influence the second processing chip due to the action of the isolation driving module, so that the stability of performance parameters of the inverter is ensured. The invention is used for converting direct current into alternating current for output.
Description
Technical Field
The present invention relates to the field of electronic circuits, and more particularly to an inverter circuit structure.
Background
Batteries are widely used in various electric devices as conventional electric energy supply sources, but since the batteries output direct current voltage, the batteries cannot be directly connected with alternating current electric devices, and the direct current output by the batteries needs to be converted into alternating current by an inverter and then output to the alternating current electric devices.
In a traditional inverter circuit, a processing chip directly controls the on-off of a switch tube, and the simplest mode for driving the switch tube to be switched on and off is adopted, but the driving mode has a defect that large parasitic parameters are easily generated under the condition that the switch tube is switched on and off at a high frequency, and the parasitic parameters easily affect the driving circuit of the switch tube and further affect the performance parameters of the whole inverter circuit.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: an inverter circuit system for driving switching tubes on and off by using an isolated driving circuit is provided.
The solution of the invention for solving the technical problem is as follows:
an inverter circuit system comprises a power supply battery, a first processing chip, a second processing chip, a DC-AC module, a transformer, an AC-DC module, an inverter module, an isolation communication module, an isolation driving module and an auxiliary power supply for supplying power to all parts of the circuit; the power supply battery is connected with an input end of an auxiliary power supply, the first processing chip is in communication connection with the second processing chip through an isolation communication module, the power supply battery is connected with an input end of a DC-AC module, an output end of the DC-AC module is connected with a primary winding of a transformer, a secondary winding of the transformer is connected with an input end of the AC-DC module, an output end of the AC-DC module is connected with an input end of an inversion module, an output end of the inversion module is used as a power output end of an inverter, the first processing chip is connected with a circuit module positioned on one side of the primary winding of the transformer, and the second processing chip is connected with a circuit module positioned on one side of; the inversion module is a full-bridge inverter topological structure comprising 4 first MOS tubes, and the second processing chip is respectively connected with the grids of the 4 first MOS tubes through the isolation driving module.
As a further improvement of the above technical solution, the isolated driving module includes two driving chips of type IR2110S, a transistor Q5, a transistor Q6, a transistor Q7 and a transistor Q8, the second processing chip is configured with an output SPWM1-1, an output SPWM2-2, an output SPWM3-3 and an output SPWM4-4, the output SPWM1-1 is respectively connected to an emitter of the transistor Q5 and a base of the transistor Q6, the output SPWM2-2 is respectively connected to a base of the transistor Q5 and an emitter of the transistor Q6, the output SPWM3-3 is respectively connected to an emitter of the transistor Q7 and a base of the transistor Q8, the output SPWM14-4 is respectively connected to a base of the transistor Q7 and an emitter of the transistor Q8, collectors of the transistor Q5, the transistor Q6, the transistor Q7 and the transistor Q8 are respectively connected to an input terminal of the driving chip, the output end of the driving chip is respectively connected with the grids of the 4 first MOS tubes.
As a further improvement of the above technical solution, the DC-AC module further includes a level conversion module, the DC-AC module includes two switch tube groups, each switch tube group includes a plurality of second MOS tubes, gates of the second MOS tubes in each switch tube group are connected together, sources of the second MOS tubes in each switch tube group are connected together, drains of the second MOS tubes in each switch tube group are connected together, the first processing chip is connected to the gates of the second MOS tubes in the two switch tube groups through the level conversion module, the sources of the second MOS tubes in each switch tube group are grounded, two ends of the primary winding of the transformer are connected to the drains of the second MOS tubes in the two switch tube groups, and the intermediate stage of the primary winding of the transformer is connected to the power supply battery.
As a further improvement of the above technical solution, the level conversion module includes two conversion units, the conversion unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a transistor Q1, a transistor Q2 and a diode D1, the output end of the auxiliary power supply is connected with the base electrode of a triode Q1 through a resistor R1 and a resistor R2, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected with the output end of the auxiliary power supply through a resistor R3, the collector of the triode Q1 is connected with the base of the triode Q2, the collector of the triode Q2 is connected with the output end of the auxiliary power supply, the emitter of the triode Q2 is connected with the grid of the switch tube group through a resistor R4, the capacitor C1 and the capacitor C2 are both connected with a resistor R4 in parallel, the anode of the diode D1 is connected with the emitter of the transistor Q2, and the cathode of the diode D1 is connected with the collector of the transistor Q1.
As a further improvement of the above technical solution, the AC-DC module includes a rectifier bridge composed of 4 rectifier diodes.
As a further improvement of the above technical solution, the isolation communication module includes a photocoupler U1, a photocoupler U2, a triode Q3 and a triode Q4, the emitting end of the first processing chip is connected to the base of the triode Q4, the emitter of the triode Q4 is grounded, the collector of the triode Q4 is connected to the auxiliary power supply through the input end of the photocoupler U2, the output end of the photocoupler U2 is connected to the receiving end of the second processing chip, the emitting end of the second processing chip is connected to the base of the triode Q3, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is connected to the auxiliary power supply through the input end of the photocoupler U1, and the output end of the photocoupler U1 is connected to the receiving end of the first processing chip.
As a further improvement of the above technical solution, the present invention further includes an EMI filter module, wherein an output terminal of the inverter module is connected to an input terminal of the EMI filter module, and an output terminal of the EMI filter module is used as a power output terminal of the inverter.
As a further improvement of the technical scheme, the invention creates the following steps: the EMI filtering module is characterized by further comprising a current sensor chip with the model of ACS712-20A, the output end of the EMI filtering module is connected with the input end of the current sensor chip, and the output end of the current sensor chip is connected with the input end of the second processing chip.
The invention has the beneficial effects that: the second processing chip controls and drives the first MOS tube in the inverter module through the isolation driving module, and when the first MOS tube is switched on and switched off at high frequency, the influence generated by parasitic parameters of the first MOS tube cannot influence the second processing chip due to the action of the isolation driving module, so that the stability of performance parameters of the inverter is ensured. The invention is used for converting direct current into alternating current for output.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures are only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from them without inventive effort.
FIG. 1 is a block diagram of the circuit schematic of the present invention;
FIG. 2 is a circuit diagram of an embodiment of an isolated driver module of the present invention;
FIG. 3 is a circuit diagram of an embodiment of a level shifting module of the present invention;
FIG. 4 is a circuit diagram of an isolated communication module embodiment of the present invention;
FIG. 5 is a circuit diagram of the DC-AC module, transformer and AC-DC module connection of the present invention;
FIG. 6 is a schematic diagram of the ports of the first processing chip and the second processing chip according to the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection relations mentioned herein do not mean that the elements are directly connected, but mean that a more preferable circuit structure can be formed by adding or reducing the connection elements according to the specific implementation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1 to 6, the present invention discloses an inverter circuit system, which includes a power supply battery, a first processing chip, a second processing chip, a DC-AC module, a transformer, an AC-DC module, an inverter module, an isolation communication module, an isolation driving module, and an auxiliary power supply for supplying power to each part of the circuit; the power supply battery is connected with an input end of an auxiliary power supply, the auxiliary power supply is provided with a plurality of output ends capable of outputting different voltages, the first processing chip is in communication connection with the second processing chip through an isolation communication module, the power supply battery is connected with an input end of a DC-AC module, an output end of the DC-AC module is connected with a primary winding of a transformer, a secondary winding of the transformer is connected with an input end of the AC-DC module, an output end of the AC-DC module is connected with an input end of an inversion module, an output end of the inversion module is used as a power output end of an inverter, the first processing chip is connected with a circuit module positioned on one side of the primary winding of the transformer, and the second processing chip is connected with a circuit module positioned; the inversion module is a full-bridge inverter topological structure comprising 4 first MOS tubes, and the second processing chip is respectively connected with the grids of the 4 first MOS tubes through the isolation driving module. Specifically, the first processing chip and the second processing chip in the invention are respectively connected to the primary side circuit module and the secondary side circuit module of the transformer, and are used for controlling the on/off of the corresponding switch tubes of the primary side circuit module and the secondary side circuit module of the transformer and collecting electrical parameters at various places of the primary side circuit module and the secondary side circuit module of the transformer to calculate various current and voltage values in the inverter, so as to adopt certain algorithms (such as a maximum power point tracking MPPT algorithm) to control the efficiency of the inverter. In the invention, the circuit modules on the two sides of the transformer are not in common, so that the circuit modules on the two sides of the transformer need to be controlled by using two processing chips, and the first processing chip and the second processing chip can not directly communicate due to the transformer, so that the communication connection needs to be realized by using an isolation communication module. The second processing chip controls and drives the first MOS tube in the inverter module through the isolation driving module, and when the first MOS tube is switched on and switched off at high frequency, the influence generated by parasitic parameters of the first MOS tube cannot influence the second processing chip due to the effect of the isolation driving module, so that the stability of performance parameters of the inverter is ensured. The invention is used for converting direct current into alternating current for output.
Further as a preferred embodiment, the invention creates a specific embodiment, the isolated driving module includes two driving chips with type IR2110S, a transistor Q5, a transistor Q6, a transistor Q7 and a transistor Q8, the second processing chip is configured with an output terminal SPWM1-1, an output terminal SPWM2-2, an output terminal SPWM3-3 and an output terminal SPWM4-4, the output terminal SPWM1-1 is connected to an emitter of the transistor Q5 and a base of the transistor Q6 respectively, the output terminal SPWM2-2 is connected to a base of the transistor Q5 and an emitter of the transistor Q6 respectively, the output terminal SPWM3-3 is connected to an emitter of the transistor Q7 and a base of the transistor Q8 respectively, the output terminal SPWM14-4 is connected to a base of the transistor Q7 and an emitter of the transistor Q8 respectively, the transistor Q5, the transistor Q6, the transistor Q7 and a collector of the transistor Q8 are connected to two driving chips, the output end of the driving chip is respectively connected with the grids of the 4 first MOS tubes. The driving chip of the type is compatible with the advantages of optical coupling isolation and electromagnetic isolation, the reaction speed is high, the driving capability is strong, and MOS tubes of various parameters can be driven compatibly.
Further as a preferred embodiment, in a specific embodiment of the present invention, the system further includes a level conversion module, the DC-AC module includes two switch tube groups, each switch tube group includes a plurality of second MOS tubes, gates of the second MOS tubes in each switch tube group are connected together, sources of the second MOS tubes in each switch tube group are connected together, drains of the second MOS tubes in each switch tube group are connected together, the first processing chip is connected to the gates of the second MOS tubes in the two switch tube groups through the level conversion module, the source of the second MOS tube in each switch tube group is grounded, two ends of the primary winding of the transformer are connected to the drains of the second MOS tubes in the two switch tube groups, and the intermediate stage of the primary winding of the transformer is connected to the power supply battery. In this embodiment, the DC-AC module is configured to convert a direct current output by a power supply battery into an alternating current so as to perform energy transfer at a transformer, and the first processing chip controls the conduction and the cut-off of the two switch tube groups in a push-pull manner, so that the direct current output by the power supply battery is converted into the alternating current before reaching a primary winding of the transformer. In addition, normally, the general input/output end of the conventional processing chip can only output a level signal below 5V, so that the first processing chip is difficult to drive some switching tubes.
Furthermore, in the embodiment of the present invention, the level shift module includes two shift units, the shift units include a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a transistor Q1, a transistor Q2, and a diode D1, the auxiliary power output (5V port) is connected to the base of the transistor Q1 through a resistor R1 and a resistor R2, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the auxiliary power output (12V port) through a resistor R3, the collector of the transistor Q1 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the auxiliary power output (12V port), the emitter of the transistor Q2 is connected to the switching gate tube group through a resistor R4, the capacitors C1 and C2 are both connected to the resistor R4 in parallel, the anode of the diode D1 is connected to the emitter of the transistor Q2, the cathode of the diode D1 is connected with the collector of the triode Q1. Specifically, when the first processing chip outputs a low level, the emitter of the transistor Q2 outputs a high level of 12V to the switching tube group, and conversely, when the first processing chip outputs a high level, the emitter of the transistor Q2 outputs a low level to the switching tube group.
Further as a preferred embodiment, in the invention, in a specific embodiment, the AC-DC module includes a rectifier bridge composed of 4 rectifier diodes, two ends of the secondary winding of the transformer are respectively connected to an input end of the rectifier bridge, and an output end of the rectifier bridge is connected to an input end of the inverter module. The invention converts the alternating current output by the secondary winding of the transformer into direct current under the action of the rectifier bridge.
Further as a preferred embodiment, in the inventive embodiment, the isolation communication module includes a photocoupler U1, a photocoupler U2, a triode Q3, and a triode Q4, the emitting end of the first processing chip is connected to the base of the triode Q4, the emitting electrode of the triode Q4 is grounded, the collector electrode of the triode Q4 is connected to the auxiliary power supply through the input end of the photocoupler U2, the output end of the photocoupler U2 is connected to the receiving end of the second processing chip, the emitting end of the second processing chip is connected to the base of the triode Q3, the emitting electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected to the auxiliary power supply through the input end of the photocoupler U1, and the output end of the photocoupler U1 is connected to the receiving end of the first processing chip. The invention creates that the first processing chip and the second processing chip can not be directly connected in communication due to the existence of the transformer, so the embodiment utilizes two photoelectric couplers U1 and U2 to connect the transmitting end of the first processing chip with the receiving end of the second processing chip, connects the receiving end of the first processing chip with the transmitting end of the second processing chip, and utilizes the intensity of optical signals in the photoelectric couplers as the judgment standard of the level of the electric signals.
Further as a preferred embodiment, in the detailed description of the present invention, the system further includes an EMI filter module, an output terminal of the inverter module is connected to an input terminal of the EMI filter module, and an output terminal of the EMI filter module is used as a power output terminal of the inverter. The invention reduces the influence of high-frequency interference signals on the alternating current electric equipment through the action of the EMI filtering module, ensures the normal operation of the alternating current electric equipment and reduces electromagnetic interference.
Further as a preferred embodiment, in the present invention, the EMI filter module further includes a current sensor chip with model number ACS712-20A, the output terminal of the EMI filter module is connected to the input terminal of the current sensor chip, and the output terminal of the current sensor chip is connected to the input terminal of the second processing chip. In order to prevent the output end of the inverter circuit system from overcurrent or short circuit, the current sensor chip is disposed at the output end of the EMI filter module in this embodiment, and is configured to detect the magnitude of the supply current when the inverter is in use, transmit data to the second processing chip, and perform determination and subsequent processing by the second processing chip.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (7)
1. An inverter circuit system characterized by: the system comprises a power supply battery, a first processing chip, a second processing chip, a DC-AC module, a transformer, an AC-DC module, an inversion module, an isolation communication module, an isolation driving module and an auxiliary power supply for supplying power to all parts of the circuit; the power supply battery is connected with an input end of an auxiliary power supply, the first processing chip is in communication connection with the second processing chip through an isolation communication module, the power supply battery is connected with an input end of a DC-AC module, an output end of the DC-AC module is connected with a primary winding of a transformer, a secondary winding of the transformer is connected with an input end of the AC-DC module, an output end of the AC-DC module is connected with an input end of an inversion module, an output end of the inversion module is used as a power output end of an inverter, the first processing chip is connected with a circuit module positioned on one side of the primary winding of the transformer, and the second processing chip is connected with a circuit module positioned on one side of; the inversion module is a full-bridge inverter topological structure comprising 4 first MOS tubes, and the second processing chip is respectively connected with the grids of the 4 first MOS tubes through the isolation driving module;
the inverter circuit system further comprises a level conversion module, the DC-AC module comprises two switch tube groups, each switch tube group comprises a plurality of second MOS tubes, the grids of the second MOS tubes in each switch tube group are connected together, the sources of the second MOS tubes in each switch tube group are connected together, the drains of the second MOS tubes in each switch tube group are connected together, the first processing chip is connected with the grids of the second MOS tubes in the two switch tube groups through the level conversion module, the sources of the second MOS tubes in each switch tube group are grounded, two ends of the primary winding of the transformer are connected with the drains of the second MOS tubes in the two switch tube groups, and the middle stage of the primary winding of the transformer is connected with the power supply battery.
2. An inverter circuit system according to claim 1, wherein: the isolation driving module comprises two driving chips with the model number of IR2110S, a triode Q5, a triode Q6, a triode Q7 and a triode Q8, the second processing chip is provided with an output end SPWM1-1, an output end SPWM2-2, an output end SPWM3-3 and an output end SPWM4-4, the output end SPWM1-1 is respectively connected with an emitting electrode of a triode Q5 and a base electrode of a triode Q6, the output end SPWM2-2 is respectively connected with the base electrode of the triode Q5 and the emitter electrode of the triode Q6, the output end SPWM3-3 is respectively connected with an emitting electrode of a triode Q7 and a base electrode of a triode Q8, the output end SPWM14-4 is respectively connected with the base electrode of the triode Q7 and the emitter electrode of the triode Q8, the triode Q5, the triode Q6, the triode Q7 and the triode Q8 are respectively connected with the input end of a driving chip, and the output end of the driving chip is respectively connected with the grid electrodes of the 4 first MOS tubes.
3. An inverter circuit system according to claim 1, wherein: the level conversion module comprises two conversion units, each conversion unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C1, a capacitor C2, a transistor Q1, a transistor Q2 and a diode D1, the auxiliary power supply output end is connected with the base of a transistor Q1 through a resistor R1 and a resistor R2, the emitter of a transistor Q1 is grounded, the collector of a transistor Q1 is connected with the auxiliary power supply output end through a resistor R3, the collector of a transistor Q1 is connected with the base of a transistor Q2, the collector of a transistor Q2 is connected with the auxiliary power supply output end, the emitter of the transistor Q2 is connected with the gate of a switching tube group through a resistor R2, the capacitor C2 and the capacitor C2 are both connected in parallel, the anode of the diode D2 is connected with the emitter of the transistor Q2, and the collector of the diode D2 is connected with the collector of.
4. An inverter circuit system according to claim 1, wherein: the AC-DC module includes a rectifier bridge consisting of 4 rectifier diodes.
5. An inverter circuit system according to claim 1, wherein: the isolation communication module comprises a photoelectric coupler U1, a photoelectric coupler U2, a triode Q3 and a triode Q4, the emitting end of the first processing chip is connected with the base of the triode Q4, the emitting electrode of the triode Q4 is grounded, the collecting electrode of the triode Q4 is connected with an auxiliary power supply through the input end of the photoelectric coupler U2, the output end of the photoelectric coupler U2 is connected with the receiving end of the second processing chip, the emitting end of the second processing chip is connected with the base of the triode Q3, the emitting electrode of the triode Q3 is grounded, the collecting electrode of the triode Q3 is connected with the auxiliary power supply through the input end of the photoelectric coupler U1, and the output end of the photoelectric coupler U1 is connected with the receiving end of the first processing chip.
6. An inverter circuit system according to claim 1, wherein: the inverter further comprises an EMI filtering module, the output end of the inversion module is connected with the input end of the EMI filtering module, and the output end of the EMI filtering module is used as the power output end of the inverter.
7. An inverter circuit system according to claim 6, wherein: the EMI filtering module is characterized by further comprising a current sensor chip with the model of ACS712-20A, the output end of the EMI filtering module is connected with the input end of the current sensor chip, and the output end of the current sensor chip is connected with the input end of the second processing chip.
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| CN201710785150.1A CN107592028B (en) | 2017-09-04 | 2017-09-04 | Inverter circuit system |
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| CN107592028B true CN107592028B (en) | 2020-03-31 |
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| CN1988310A (en) * | 2006-11-09 | 2007-06-27 | 上海大学 | Current source type photovoltiac parallel-in system and its control device and method |
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