CN110365242B - Efficient inverter circuit, control method thereof and inverter device - Google Patents
Efficient inverter circuit, control method thereof and inverter device Download PDFInfo
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- CN110365242B CN110365242B CN201910629277.3A CN201910629277A CN110365242B CN 110365242 B CN110365242 B CN 110365242B CN 201910629277 A CN201910629277 A CN 201910629277A CN 110365242 B CN110365242 B CN 110365242B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a high-efficiency inverter circuit, a control method thereof and an inverter device, wherein the output voltage condition of a DC-DC conversion unit is acquired through a first voltage feedback circuit to acquire a first voltage feedback signal, a first main control circuit outputs a conversion control signal for controlling the DC-DC conversion unit according to the first voltage feedback signal, and the DC-DC conversion unit is in a closed-loop control state; the current feedback circuit is arranged to detect the output current condition of the DC-AC conversion unit so as to acquire a current feedback signal, the first main control circuit controls whether to output an open loop control signal according to the current feedback signal, and under the condition of outputting the open loop control signal, the open loop control circuit interrupts voltage feedback of the first voltage feedback circuit according to the open loop control signal, the DC-DC conversion unit is in an open loop control state at the moment, the DC-DC conversion unit works with the maximum conversion efficiency, the circuit utilization rate is improved, and the conversion efficiency of the inverter circuit is effectively improved; the inverter has high conversion efficiency due to the inverter circuit having high conversion efficiency.
Description
Technical Field
The invention relates to the field of inversion, in particular to a direct current conversion circuit, a control method thereof and a direct current conversion device.
Background
An inverter is a device that converts direct current energy into alternating current. It is generally composed of an inverter bridge, control logic and a filter circuit. The inverter has been widely used for air conditioners, home theaters, electric grinding wheels, electric tools, sewing machines, DVDs, VCDs, computers, televisions, washing machines, range hoods, refrigerators, video recorders, massagers, fans, lighting, and the like.
In the prior art, along with the development of technology, higher requirements are put on the inverter, and performance requirements are developed towards high efficiency, however, the existing inverter cannot meet the requirements of high conversion efficiency, so that improvement on the technology is needed.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems described in the related description to some extent. Therefore, an object of the present invention is to provide a high-efficiency inverter circuit, a control method thereof, and an inverter device, which can improve the conversion efficiency of the circuit.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a high-efficiency inverter circuit, including a DC input terminal, a DC-DC conversion unit, a DC-AC conversion unit, an AC output terminal, a first voltage feedback circuit for obtaining a first voltage feedback signal of the output terminal of the DC-DC conversion unit, a current feedback circuit for obtaining a current feedback signal of the output terminal of the DC-AC conversion unit, an open loop control circuit, and a first main control circuit; the first main control circuit is used for outputting a conversion control signal for controlling the work of the DC-DC conversion unit according to the first voltage feedback signal, the first main control circuit is used for controlling whether to output an open-loop control signal according to the current feedback signal, and the open-loop control circuit is used for interrupting the voltage feedback of the first voltage feedback circuit according to the open-loop control signal;
the DC input end is connected with the input end of the DC-DC conversion unit, the output end of the DC-DC conversion unit is respectively connected with the input end of the DC-AC conversion unit and the input end of the first voltage feedback circuit, the output end of the DC-AC conversion unit is connected with the alternating current output end, the output end of the DC-AC conversion unit is connected with the input end of the current feedback circuit, the output end of the first voltage feedback circuit and the output end of the current feedback circuit are both connected with the input end of the first main control circuit, the output end of the first main control circuit is connected with the control end of the DC-DC conversion unit to input the conversion control signal, the output end of the first main control circuit is connected with the input end of the open loop control circuit, and the output end of the open loop control circuit is connected with the input end of the first voltage feedback circuit.
Further, the DC-DC conversion unit includes a DC-DC conversion circuit and a rectifying and filtering circuit, the DC input end is connected to the input end of the DC-DC conversion circuit, the output end of the DC-DC conversion circuit is connected to the input end of the rectifying and filtering circuit, the output end of the rectifying and filtering circuit is connected to the input end of the DC-AC conversion unit and the input end of the first voltage feedback circuit, respectively, and the output end of the first main control circuit is connected to the control end of the DC-DC conversion circuit.
Further, the DC-DC conversion unit further comprises an LC resonance circuit, and the output end of the DC-DC conversion circuit is connected with the input end of the rectifying and filtering circuit through the LC resonance circuit.
Further, the high-efficiency inverter circuit further comprises a current detection circuit for obtaining a current feedback signal of the input end of the DC-DC conversion circuit, the direct current input end is connected with the input end of the DC-DC conversion circuit through the current detection circuit, and the output end of the current detection circuit is connected with the input end of the first main control circuit.
Further, the first voltage feedback circuit comprises an operational amplifier and a reference voltage circuit, wherein the output end of the DC-DC conversion unit is connected with the non-inverting input end of the operational amplifier, the output end of the reference voltage circuit is connected with the inverting input end of the operational amplifier, and the output end of the operational amplifier is connected with the input end of the first main control circuit.
Further, the open loop control circuit comprises a switching tube and a signal input end for receiving the open loop control signal, the signal input end is connected with a control end of the switching tube, a positive output end of the switching tube is connected with a non-inverting input end of the operational amplifier, and a negative output end of the switching tube is grounded.
Further, the DC-AC conversion unit includes a DC-AC conversion circuit, a second voltage feedback circuit for obtaining a voltage feedback signal of the AC output end, a driving circuit and a second main control circuit, the output end of the DC-DC conversion unit is connected with the input end of the DC-AC conversion circuit, the output end of the DC-AC conversion circuit is connected with the AC output end and the input end of the current feedback circuit, the AC output end is connected with the input end of the second voltage feedback circuit, the output end of the second voltage feedback circuit is connected with the input end of the second main control circuit, the output end of the second main control circuit is connected with the input end of the driving circuit, and the output end of the driving circuit is connected with the control end of the DC-AC conversion circuit.
Further, the high-efficiency inverter circuit further comprises a communication circuit, the output end of the current feedback circuit is connected with the input end of the second main control circuit, the second main control circuit is connected with the communication circuit, and the communication circuit is connected with the first main control circuit.
Further, the high-efficiency inverter circuit further comprises a voltage detection circuit for acquiring a second voltage feedback signal of the input end of the DC-AC conversion unit, the output end of the DC-DC conversion unit is connected with the input end of the DC-AC conversion unit through the voltage detection circuit, the output end of the voltage detection circuit is connected with the input end of the first main control circuit, and the first main control circuit is used for controlling whether to output the open-loop control signal according to the second voltage feedback signal and the current feedback signal.
In a second aspect, the present invention provides an inverter device including the high-efficiency inverter circuit.
In a third aspect, the present invention provides a control method of an efficient inverter circuit, applied to the efficient inverter circuit, including:
judging whether the high-efficiency inverter circuit is overloaded or not according to the current feedback signal;
if the load is judged to be heavy, the first main control circuit outputs an open-loop control signal to the open-loop control circuit;
the open loop control circuit interrupts voltage feedback of the first voltage feedback circuit according to the open loop control signal;
the first main control circuit performs open-loop control on the DC-DC conversion unit.
The beneficial effects of the invention are as follows:
in the efficient inverter circuit, the output voltage condition of the DC-DC conversion unit is acquired through the first voltage feedback circuit to acquire a first voltage feedback signal, and the first main control circuit outputs a conversion control signal for controlling the DC-DC conversion unit according to the first voltage feedback signal, so that the DC-DC conversion unit is in a closed-loop control state; in addition, a current feedback circuit is arranged to detect the output current condition of the DC-AC conversion unit so as to acquire a current feedback signal, the first main control circuit controls whether to output an open loop control signal according to the current feedback signal, and under the condition of outputting the open loop control signal, the open loop control circuit interrupts voltage feedback of the first voltage feedback circuit according to the open loop control signal, the DC-DC conversion unit is in an open loop control state at the moment, the DC-DC conversion unit works with the maximum conversion efficiency, the circuit utilization rate is improved, and the conversion efficiency of the inverter circuit is effectively improved; the technical problem that the inverter cannot meet the requirement of high conversion efficiency in the prior art is solved. On the other hand, the inverter has a high conversion efficiency due to the inverter circuit having a high conversion efficiency.
Drawings
FIG. 1 is a block diagram of one embodiment of a high efficiency inverter circuit of the present invention;
FIG. 2 is a circuit diagram of one embodiment of a DC input, current sensing circuit, and DC-DC conversion unit in the present invention;
FIG. 3 is a circuit diagram of one embodiment of an open loop control circuit and a first voltage feedback circuit in the present invention;
FIG. 4 is a circuit diagram of one embodiment of a DC-AC conversion unit and an AC output in the present invention;
FIG. 5 is a circuit diagram of two embodiments of the driving circuit of the present invention;
FIG. 6 is a circuit diagram of one embodiment of a first master circuit, a communication circuit, and a second master circuit in the present invention;
fig. 7 is a circuit diagram of two embodiments of a power supply circuit in the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Example 1
Referring to fig. 1, fig. 1 exemplarily shows a block diagram of a high-efficiency inverter circuit including a direct current input terminal 1, a DC-DC conversion unit 2, a DC-AC conversion unit 3, an alternating current output terminal 4, a first voltage feedback circuit 10 for acquiring a first voltage feedback signal of the output terminal of the DC-DC conversion unit 2, a current feedback circuit for acquiring a current feedback signal of the output terminal of the DC-AC conversion unit 3, an open loop control circuit 9, and a first main control circuit 5; the first main control circuit 5 is configured to output a conversion control signal for controlling the operation of the DC-DC conversion unit 2 according to the first voltage feedback signal, the first main control circuit 5 is configured to control whether to output an open loop control signal according to the current feedback signal, and the open loop control circuit 9 is configured to interrupt the voltage feedback of the first voltage feedback circuit 10 according to the open loop control signal, so that the first voltage feedback circuit 10 cannot perform the voltage feedback.
Specifically, the direct current input end 1 is connected with the input end of the DC-DC conversion unit 2, the output end of the DC-DC conversion unit 2 is connected with the input end of the DC-AC conversion unit 3 and the input end of the first voltage feedback circuit 10, the output end of the DC-AC conversion unit 3 is connected with the alternating current output end 4, the output end of the DC-AC conversion unit 3 is connected with the input end of the current feedback circuit, the output end of the first voltage feedback circuit 10 and the output end of the current feedback circuit are both connected with the input end of the first main control circuit 5, the output end of the first main control circuit 5 is connected with the control end of the DC-DC conversion unit 2 to input a conversion control signal, the output end of the first main control circuit 5 is connected with the input end of the open loop control circuit 9, and the output end of the open loop control circuit 9 is connected with the input end of the first voltage feedback circuit 10. In actual use, the high-efficiency inverter circuit is connected with a load through the alternating current output end 4.
In this embodiment, the high-efficiency inverter circuit obtains the output voltage condition of the DC-DC conversion unit 2 through the first voltage feedback circuit 10 to obtain a first voltage feedback signal, and the first main control circuit 5 outputs a conversion control signal for controlling the DC-DC conversion unit 2 according to the first voltage feedback signal, where the DC-DC conversion unit 2 is in a closed-loop control state; in addition, a current feedback circuit is provided to detect the output current condition of the DC-AC conversion unit 3 to obtain a current feedback signal, where the current feedback signal may reflect the load condition carried by the high-efficiency inverter circuit, such as heavy load and light load, and the first main control circuit 5 controls whether to output an open loop control signal according to the current feedback signal, for example, when the current feedback signal is determined to be heavy load, the open loop control signal is output, and when the current feedback signal is determined to be light load, the closed loop control signal is output; under the condition of outputting an open-loop control signal, the open-loop control circuit 9 interrupts voltage feedback of the first voltage feedback circuit 10 according to the open-loop control signal, the DC-DC conversion unit 2 is in an open-loop control state, the DC-DC conversion unit 2 works with maximum conversion efficiency, the circuit utilization rate is improved, and the conversion efficiency of the inverter circuit is effectively improved; the technical problem that the inverter cannot meet the requirement of high conversion efficiency in the prior art is solved. When the closed-loop control signal is output, the open-loop control circuit 9 does not interrupt the voltage feedback of the first voltage feedback circuit 10, and the first main control circuit 5 outputs a conversion control signal for controlling the operation of the DC-DC conversion unit 2 according to the first voltage feedback signal, that is, the DC-DC conversion unit 2 is in a closed-loop control state at this time.
Specifically, a preset current value is set, the current value of the current feedback signal is compared with the preset current value, when the current value of the current feedback signal is larger than the preset current value, the circuit is in a heavy load state, and when the current value of the current feedback signal is smaller than the preset current value, the circuit is in a light load state.
Further, referring to fig. 1, the DC-DC conversion unit 2 includes a DC-DC conversion circuit 2-1, an LC resonance circuit 2-2, and a rectifying and filtering circuit 2-3, the high-efficiency inverter circuit further includes a current detection circuit 8 for obtaining a current feedback signal of an input end of the DC-DC conversion circuit 2-1, the DC input end 1 is connected to the input end of the DC-DC conversion circuit 2-1 through the current detection circuit 8, an output end of the DC-DC conversion circuit 2-1 is connected to an input end of the rectifying and filtering circuit 2-3 through the LC resonance circuit 2-2, an output end of the rectifying and filtering circuit 2-3 is connected to an input end of the DC-AC conversion unit 3 and an input end of the first voltage feedback circuit 10, respectively, an output end of the first main control circuit 5 is connected to a control end of the DC-DC conversion circuit 2-1, and an output end of the current detection circuit 8 is connected to an input end of the first main control circuit 5.
The current detection circuit 8 is configured to detect the current at the input end of the DC-DC conversion circuit 2-1, so as to realize current feedback at the front end, and the first main control circuit 5 can know the current condition at the input end of the DC-DC conversion circuit 2-1; the LC resonant circuit 2-2 is arranged between the DC-DC conversion circuit 2-1 and the rectifying and filtering circuit 2-3, so that the first main control circuit 5 can realize soft switching control of the DC-DC conversion circuit 2-1, voltage spikes in the circuit are reduced, the conversion efficiency of DC-DC conversion is further improved, and the conversion efficiency of the high-efficiency inverter circuit is improved.
Preferably, referring to fig. 1 and 2, fig. 2 exemplarily shows a circuit diagram of a DC input terminal, a current detection circuit, and a DC-DC conversion unit, the DC input terminal 1 includes a first filter capacitor CE1, and an input DC voltage is filtered by the first filter capacitor CE1 to form a first DC voltage DC1. The current detection circuit 8 includes a current feedback resistor FR1, and the current feedback resistor FR1 samples a first direct current DC1 (i.e., an input current of the DC-DC conversion circuit 2-1) and transmits the sampled first direct current DC1 to an input terminal of the first main control circuit 5 through the output terminal IS 1. In this embodiment, the first main control circuit 5 includes a processor such as a single-chip microcomputer, and uses the processor as a main control center to control the operation of the first half circuit (i.e., the DC-DC conversion circuit) of the efficient inverter circuit.
Referring to fig. 1 and 2, a DC-DC conversion circuit 2-1 includes a first power tube M1, a second power tube M2, and a transformer T1, wherein a negative end of a DC input terminal 1, i.e., DC 1-is connected to both a negative output terminal of the first power tube M1 and a negative output terminal of the second power tube M2 through a current detection circuit 8, a control terminal PWM1 of the first power tube M1 and a control terminal PWM2 of the second power tube M2 are respectively used as control terminals of the DC-DC conversion circuit 2-1, and an output terminal of a first main control circuit 5 outputs a conversion control signal to the control terminal PWM1 and the control terminal PWM2; the positive output end of the first power tube M1 is connected with the first input end A of the transformer T1, the positive output end of the second power tube M2 is connected with the second input end C of the transformer T1, the positive end of the direct current input end 1, namely DC1, is connected with the middle input end B of the transformer T1 (namely a middle tap of the transformer T1), and the output end of the transformer T1 is connected with the input end of the rectifying and filtering circuit 2-3. In this embodiment, the DC-DC conversion circuit 2-1 is a DC-DC boost circuit, the conversion control signal is a complementary push-pull PWM signal, and the first power tube M1 and the second power tube M2 are controlled to be alternately turned on by using a group of complementary push-pull PWM signals to convert the first direct current DC1 into the second direct current, and the voltage value of the first direct current DC1 is boosted to realize direct current boost. And meanwhile, a rectifying and filtering circuit 2-3 is arranged to filter voltage spikes in the second direct current to generate a smooth third direct current signal, and the third direct current signal is output from output ends DC2 and DC 2-of the rectifying and filtering circuit 2-3 to the input end of the DC-AC conversion unit 3 and the input end of the first voltage feedback circuit 10.
Still further, referring to fig. 2, in this embodiment, the first power tube M1 and/or the second power tube M2 are/is exemplified by MOS tubes, the gate of each MOS tube is a control end of the power tube, the source of each MOS tube is a negative output end of the power tube, and the drain of each MOS tube is a positive output end of the power tube. The rectifying and filtering circuit 2-3 comprises a rectifying bridge and a filtering capacitor CE2, the LC resonant circuit 2-2 comprises a resonant inductor Ls and a resonant capacitor CBB1, a first output end D of the transformer T1 is connected with one end of the resonant inductor Ls, the other end of the resonant inductor Ls is connected with one end of the resonant capacitor CBB1, the other end of the resonant capacitor CBB1 is connected with an input end of the rectifying bridge, an output end of the rectifying bridge is connected with an input end of the filtering capacitor CE2, and output ends (namely DC2 and DC 2-) of the filtering capacitor CE2 are respectively connected with an input end of the DC-AC conversion unit 3 and an input end of the first voltage feedback circuit 10. In this embodiment, the rectifier bridge includes diodes D1, D2, D3 and D4, and the resonant inductance Ls is the self leakage inductance of the transformer T1.
When the LC resonant circuit 2-2 is not added, the first power tube M1 and the second power tube M2 in the DC-DC conversion circuit 2-1 work in a hard switching state, when the power tubes work in the hard switching state, a very high voltage spike can be generated in the circuit, meanwhile, the switching loss of the power tubes can be increased, the generated voltage spike can be proportionally transferred to the rectifying and filtering circuit 2-3 through the transformer T1, and meanwhile, higher loss is brought to the rectifying and filtering circuit 2-3, so that the overall conversion efficiency of the high-efficiency inverter circuit is affected. After the LC resonance circuit 2-2 is arranged, the second direct current is in series resonance with the resonance capacitor CBB1 through the resonance inductor Ls, so that the power tubes (the first power tube M1 and the second power tube M2) work in a soft switching state, voltage peaks in the circuit are reduced, and the conversion efficiency of the high-efficiency inverter circuit is further improved.
Further, referring to fig. 1 and 3, fig. 3 is a circuit diagram of an embodiment of an open loop control circuit and a first voltage feedback circuit in the present invention, the first voltage feedback circuit 10 includes an operational amplifier IC1 and a reference voltage circuit, an output terminal (i.e., DC 2) of the DC-DC converting unit 2 is connected to a non-inverting input terminal of the operational amplifier IC1, an output terminal of the reference voltage circuit is connected to an inverting input terminal of the operational amplifier IC1, and an output terminal FB1 of the operational amplifier IC1 is connected to an input terminal of the first master circuit 5. The reference voltage circuit includes a dc power VCC2, voltage dividing resistors R27 and R35, which are configured to provide a reference voltage for the operational amplifier IC1, and the voltage value of the reference voltage can be freely set, which is not limited herein. In the closed loop control state, the operational amplifier IC1 compares the output voltage of the output terminal DC2 (i.e., the voltage of the third direct current) with the reference voltage to realize voltage feedback, when the voltage of the output terminal DC2 is greater than the set reference voltage, the operational amplifier IC1 outputs the first voltage feedback signal from the output terminal FB1 to the first main control circuit 5 after being isolated by the optocoupler PC1, and then the first main control circuit 5 can know that the output voltage of the DC-DC conversion unit 2 (i.e., the third direct current signal) is too high, and can timely adjust the conversion control signal to control the voltage recovery stability of the third direct current signal.
Referring to fig. 1, 2 and 3, the OPEN-loop control circuit 9 includes a switching tube Q2 and a signal input terminal open_pwm for receiving an OPEN-loop control signal, the signal input terminal open_pwm is connected to a control terminal of the switching tube Q2, a positive output terminal of the switching tube Q2 is connected to a non-inverting input terminal of the operational amplifier IC1, and a negative output terminal of the switching tube Q2 is grounded. In the embodiment, the negative output end of the switch tube Q2 is connected with the negative end DC 2-of the output end of the rectifying and filtering circuit 2-3, namely grounded; the switching tube Q2 is an NPN triode, the base electrode of the NPN triode is the control end of the switching tube, the collector electrode of the NPN triode is the positive output end of the switching tube, and the emitter electrode of the NPN triode is the negative output end of the switching tube.
In this embodiment, when the current feedback signal reflects that the load condition carried by the high-efficiency inverter circuit is light load, that is, the output current of the DC-AC conversion unit is smaller, at this time, the first main control circuit outputs a low level (that is, a closed-loop control signal) to the signal input terminal open_pwm to control the DC-DC conversion unit to be in a closed-loop control state, the first voltage feedback circuit can normally reflect the voltage condition of the third DC electrical signal, and the first main control circuit outputs a push-pull PWM signal (that is, a conversion control signal) to the DC-DC conversion circuit according to the first voltage feedback signal to control the third DC electrical signal to be stable, at this time, the duty ratio of the push-pull PWM signal is continuously adjusted to make the third DC electrical signal stable.
When the current feedback signal reflects that the load condition carried by the high-efficiency inverter circuit is heavy load, namely the output current of the DC-AC conversion unit is large, at the moment, the first main control circuit outputs a high level (OPEN-loop control signal) to the signal input end OPEN_PWM to control the DC-DC conversion unit to be in an OPEN-loop control state, the OPEN-loop control signal pulls down the level of the non-inverting input end of the operational amplifier IC1 through the switching tube Q2 so as to shield the voltage feedback of the third direct current signal, so that the first main control circuit cannot detect the first voltage feedback signal, and at the moment, the first main control circuit outputs the push-pull PWM signal to the maximum duty ratio to carry out OPEN-loop control because the first voltage feedback signal cannot be detected, and at the moment, the maximum duty ratio is not more than 50%, and the value of the maximum duty ratio can be freely set; it is worth noting that the third direct current voltage needs to be ensured to be within the design range of the circuit under the open loop control, and because the push-pull PWM signal is always the maximum duty ratio during the open loop control, compared with the push-pull PWM signal which is continuously regulated during the closed loop control, the open loop control can fully transfer energy, and the maximum utilization rate of the circuit is improved, so that the conversion efficiency of the circuit is improved, and the integral conversion efficiency of the high-efficiency inverter circuit is improved.
Still further, referring to fig. 1, the DC-AC converting unit 3 includes a DC-AC converting circuit 3-1, a voltage detecting circuit 3-2 for obtaining a second voltage feedback signal of an input end of the DC-AC converting circuit 3-1 (i.e., an input end of the DC-AC converting unit 3), a second voltage feedback circuit 3-5 for obtaining a voltage feedback signal of an AC output end 4, a driving circuit 3-3 and a second main control circuit 3-6, in this embodiment, the DC-AC converting unit 3 includes a current feedback circuit 3-4, an output end of the DC-AC converting circuit 3-1 serves as an output end of the DC-AC converting unit 3, specifically, an output end of the DC-DC converting unit 2 is connected to an input end of the DC-AC converting circuit 3-1 through the voltage detecting circuit 3-2, an output end of the DC-AC converting circuit 3-1 is connected to the AC output end 4, an input end of the current feedback circuit 3-4 is connected to an input end of the second voltage feedback circuit 3-5, an output end of the main control circuit 3-5 is connected to an output end of the driving circuit 3-6, and an output end of the DC-AC converting circuit 3-1 is connected to an output end of the driving circuit 3-6.
The voltage detection circuit 3-2 is arranged to detect the voltage of the input end of the DC-AC conversion circuit 3-1 so that the second main control circuit 3-6 knows the voltage condition of the input end of the DC-AC conversion circuit 3-1; and the driving circuit 3-3 and the second main control circuit 3-6 are arranged to drive and control the DC-AC conversion circuit 3-1, so that the DC-AC conversion process is controllable, and the stability and safety of the circuit are enhanced. In addition, the second voltage feedback circuit 3-5 is configured to detect the voltage condition of the AC output terminal 4, so that the second main control circuit 3-6 can control the DC-AC conversion circuit 3-1 to operate according to the voltage feedback signal obtained by the second voltage feedback circuit 3-5, so as to keep the AC signal output by the DC-AC conversion circuit 3-1 stable. Specifically, the second main control circuit 3-6 includes a processor such as a single chip microcomputer, and the processor is used as a main control center to control the work of the back-end DC-AC conversion part circuit.
Still further, referring to fig. 1, the high-efficiency inverter circuit further includes a communication circuit 6, the output end of the current feedback circuit 3-4 is connected to the input end of the second main control circuit 3-6, the second main control circuit 3-6 is connected to the communication circuit 6, and the communication circuit 6 is connected to the first main control circuit 5. Due to the arrangement of the communication circuit 6, data exchange between the first main control circuit 5 and the second main control circuit 3-6 can be realized, the stability of the circuit structure and the function of the front-end DC-DC conversion part and the rear-end DC-AC conversion part is facilitated, the data of the front part and the rear part can be mutually shared, and the stability of the high-efficiency inverter circuit is enhanced. Specifically, because the first main control circuit 5 and the second main control circuit 3-6 can communicate with each other, during open loop control, the second main control circuit 3-6 can judge whether the load is light or heavy according to the current feedback signal obtained by the current feedback circuit 3-4, and when judging that the load is heavy, the second main control circuit 3-6 generates an open loop control signal, then the open loop control signal is transmitted to the first main control circuit 5 through the communication circuit 6, and then the first main control circuit 5 controls the open loop control circuit 9 to work according to the open loop control signal so as to control the DC-DC conversion circuit to be in an open loop control state. Similarly, when the light load is judged, the DC-DC conversion circuit is controlled to be in a closed-loop control state. It is conceivable that the second main control circuit 3-6 directly processes and judges according to the current feedback signal obtained by the current feedback circuit 3-4, and generates an open loop control signal to control the open loop control circuit to work when in heavy load, and generates a closed loop control signal to control the open loop control circuit to work when in light load.
Specifically, referring to fig. 1 and 4, fig. 4 exemplarily shows a circuit diagram of a DC-AC converting unit and an alternating current output terminal; the DC-AC conversion circuit 3-1 comprises a third power tube M3, a fourth power tube M4, a fifth power tube M5, a sixth power tube M6, an inductor L2 and a second filter capacitor CBB2, wherein the control end of the third power tube M3, the control end of the fourth power tube M4, the control end of the fifth power tube M5 and the control end of the sixth power tube M6 are respectively connected with the output ends (namely HO1, LO1, HO2 and LO 2) of the driving circuit 3-3, and the driving circuit 3-3 comprises a bridge driving chip; referring to fig. 5 and 6, fig. 5 provides two implementations of the drive circuit: a first driving circuit 3-3A and a second driving circuit 3-3B, fig. 6 exemplarily shows a circuit diagram of a first main control circuit, a communication circuit, and a second main control circuit; taking the first driving circuit 3-3A as an example, the bridge driving chip (i.e. IC4 and IC 6) may be implemented by using an IR2110 type bridge driving chip, where a control end of the bridge driving chip is connected to an output end of the second main control circuit 3-6 to receive PWM driving signals PWM1L, PWM1H, PWM2L, PWM H and control the operation of the power transistors according to the PWM driving signals, where PWM1L, PWM1H and PWM2L, PWM H are two sets of complementary driving signals, the second main control circuit 3-6 controls the two sets of third power transistors M3, sixth power transistors M6, fifth power transistors M5 and fourth power transistors M4 to be alternately turned on to implement full-bridge inversion, and filters with the second filter capacitor CBB2 through the inductor L2 to finally convert the third direct current signal into an alternating current signal AC1 (such as AC1_l and AC1_n in fig. 4); the output end of the DC-AC conversion circuit 3-1 is connected with an alternating current output end 4, the alternating current output end 4 comprises a common mode inductor LF1 and a capacitor CX1, and an alternating current electric signal AC1 can be converted into a smooth alternating current electric signal after being subjected to low-pass filtration through the common mode inductor LF1 and the capacitor CX 1.
Further, referring to fig. 4 and 5, the bridge driving chip adopted by the second driving circuit 3-3B is a bridge driving chip of IR2106 type, which is the same as the first driving circuit 3-3A, and the second driving circuit 3-3B receives the PWM driving signal of the second main control circuit 3-6 to control the operation of the power tube. Referring to fig. 6, taking the first driving circuit 3-3A as an example, the second main control circuit 3-6 includes a single chip microcomputer (not shown), and connection between the single chip microcomputer and the driving circuit, the communication circuit 6, the second voltage feedback circuit 3-5, and the current feedback circuit 3-4 is implemented by using the second interface JP 2. Similarly, referring to fig. 2, the single chip microcomputer of the first master control circuit 5 is connected with the current detection circuit 8, the DC-DC conversion circuit 2-1, the communication circuit 6 and the first voltage feedback circuit 10 through the first interface JP 1.
Further, referring to fig. 1, 4 and 6, the second voltage feedback circuit 3-5 is connected to the ac output terminal 4, and the second voltage feedback circuit 3-5 samples the ac voltage signal of the ac output terminal 4 and outputs the signal to the feedback input terminal FB2 of the second main control circuit 3-6. The second main control circuit 3-6 calculates a pulse width signal capable of stabilizing the alternating current signal through a feedback signal of the input end FB2, and outputs the pulse width signal to the driving circuit 3-3 through the PWM1L, PWM1H, PWM2L, PWM H so as to control the work of the DC-AC conversion circuit 3-1, thereby achieving the purpose of controlling the stabilization of the alternating current signal. The voltage detection circuit 3-2 samples the voltage input to the DC-AC conversion circuit 3-1 through resistor voltage division, specifically, the voltage detection circuit 3-2 includes resistors R2, R3 and R4, and the second voltage feedback signal at the input end of the DC-AC conversion circuit 3-1 is obtained and then input to the second main control circuit 3-6 through VDC2, so that the second main control circuit 3-6 can know the voltage at the input end of the DC-AC conversion circuit 3-1. Further, the current feedback circuit 3-4 includes resistors R5 and R6, and the magnitude of the current at the output of the DC-AC conversion circuit can be sampled by R5 and R6. The communication circuit 6 comprises the optocouplers PC2 and PC3, so that the optocoupler isolation is realized, and the communication before the first main control circuit 5 and the second main control circuit 3-6 can be realized.
In addition, it should be noted that, referring to fig. 1, the first main control circuit may further control whether to output an open loop control signal according to the second voltage feedback signal and the current feedback signal, specifically, may perform conversion according to the second feedback voltage signal to obtain the magnitude of the AC voltage output after conversion by the DC-AC conversion circuit 3-1, and then obtain the magnitude of the output power according to the output AC voltage and the current feedback signal, where the first main control circuit determines whether the high-efficiency inverter circuit is heavy load or light load according to the magnitude of the output power, may set an output power threshold, and performs comparison and determination according to the output power threshold and the obtained output power, when the output power is greater than the output power threshold, the circuit is heavy load, otherwise, the circuit is light load; and when the load is judged to be heavy, outputting an open-loop control signal to control the voltage feedback interruption of the first voltage feedback circuit. When the load is judged to be light, a closed-loop control signal is output to control the DC-DC conversion circuit to be in a closed-loop control state. Further, in the present embodiment, the calculation formula of the ac voltage is U Traffic intersection ＝[(U Reverse 2 *Z MAX )/√2]* z, where U Reverse 2 Z is the magnitude of the voltage value of the second feedback voltage signal MAX The maximum duty ratio of the PWM driving signal is given, z is the conversion efficiency of the DC-AC conversion circuit, and the calculation formula of the output power is P=U Traffic intersection I, wherein I is the current value of the current feedback signal.
It is easy to think that the second main control circuit can also directly control whether to output an open loop control signal according to the second voltage feedback signal and the current feedback signal, and open loop and closed loop control can be performed after the output power is calculated. Or the second main control circuit calculates the output power and obtains the control result of the open-closed loop, and then the output power is transmitted to the first main control circuit through the communication circuit to control the open-closed loop.
On the other hand, the second main control circuit can obtain the output power (p=ui) according to the current feedback signal and the voltage feedback signal obtained by the second voltage feedback circuit, then judge that the high-efficiency inverter circuit is in light load or heavy load according to the output power, and finally control the open loop control circuit to work according to the light load or heavy load condition, but the output power has larger error for judging light load or heavy load. Similarly, the first main control circuit may obtain the output power according to the current feedback signal and the voltage feedback signal obtained by the second voltage feedback circuit, then determine that the high-efficiency inverter circuit is in light load or heavy load according to the output power, and finally control the open loop control circuit to work according to the light load or heavy load. Similarly, after the second main control circuit makes a light load or heavy load judgment, the open-closed loop control result is transmitted to the first main control circuit to control the open-loop control circuit to work.
In addition, referring to fig. 1, the high-efficiency inverter circuit further includes a power supply circuit for supplying power to the first master circuit 5 and the second master circuit 3-6, and referring to fig. 6 and 7, two kinds of power supply circuits are exemplarily provided in fig. 7, and as shown in fig. 7-a, the power supply circuit may be a transformer T1 in the DC-DC conversion circuit 2-1 to add a power supply winding T1-4 to supply power to the first master circuit 5 and the second master circuit 3-6, and may also supply power in combination with three-terminal voltage regulators (IC 9 and IC 10) such as 78L12, 78L05, etc. The power supply circuit may also be a power supply circuit composed of an isolation transformer and a power management chip (UC 3843, UC3844, etc.), referring to 7-B, wherein IC7 and IC11 are three-terminal voltage regulators, the same three-terminal voltage regulator as IC9 and IC10 may be used, and IC8 is a power management chip. The specific implementation of the power supply circuit is not limited here.
Example 2
An inverter device comprising the high-efficiency inverter circuit of embodiment 1. The inverter device has a high-efficiency inverter circuit with high conversion efficiency, and the specific description of the high-efficiency inverter circuit is referred to embodiment 1 and will not be repeated.
Example 3
A control method of an efficient inverter circuit, applied to the efficient inverter circuit described in embodiment 1, includes:
judging whether the high-efficiency inverter circuit is overloaded according to the current feedback signal;
if the load is judged to be heavy, the first main control circuit outputs an open-loop control signal to the open-loop control circuit;
the open loop control circuit interrupts voltage feedback of the first voltage feedback circuit according to the open loop control signal;
the first main control circuit performs open loop control on the DC-DC conversion unit.
Specifically, a preset current value is set, the current value of the current feedback signal is compared with the preset current value, when the current value of the current feedback signal is larger than the preset current value, the circuit is in a heavy load state, and when the current value of the current feedback signal is smaller than the preset current value, the circuit is in a light load state.
When the high-efficiency inverter circuit is judged to be not lightly loaded according to the current feedback signal, the voltage feedback is not interrupted, the DC-DC conversion unit is in a closed-loop control state, the output voltage condition of the DC-DC conversion unit is obtained through the first voltage feedback circuit to obtain a first voltage feedback signal, the first main control circuit outputs a conversion control signal for controlling the DC-DC conversion unit according to the first voltage feedback signal so as to control the third direct current signal to be stable, in the embodiment, the conversion control signal is a complementary push-pull PWM signal, and the duty ratio of the push-pull PWM signal is continuously adjusted so as to enable the third direct current signal to be stable.
In the case of outputting the open-loop control signal, the open-loop control circuit interrupts the voltage feedback of the first voltage feedback circuit according to the open-loop control signal, and the DC-DC conversion unit is in the open-loop control state, as can be seen from reference embodiment 1, the duty ratio of the push-pull PWM signal is the maximum duty ratio, and the maximum duty ratio is not more than 50%, and the DC-DC conversion unit works with the maximum conversion efficiency, so that the utilization rate of the circuit is improved, the conversion efficiency of the high-efficiency inverter circuit is further effectively improved, and the technical problem that the inverter in the prior art cannot meet the requirement of high conversion efficiency is overcome.
Further, whether the high-efficiency inverter circuit is overloaded or not can be judged according to the second voltage feedback signal and the current feedback signal, namely, whether the high-efficiency inverter circuit is overloaded or not is judged according to the output power, the output power is compared with the output power threshold value, when the output power is larger than the output power threshold value, the high-efficiency inverter circuit is judged to be overloaded, and otherwise, the high-efficiency inverter circuit is judged to be lightly loaded. The open loop control signal is output when the heavy load is determined, and the closed loop control signal is output when the light load is determined, and the description of embodiment 1 is omitted.
While the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope of the present invention as defined in the appended claims.
Claims (10)
1. The high-efficiency inverter circuit is characterized by comprising a direct current input end, a DC-DC conversion unit, a DC-AC conversion unit, an alternating current output end, a first voltage feedback circuit for acquiring a first voltage feedback signal of the output end of the DC-DC conversion unit, a current feedback circuit for acquiring a current feedback signal of the output end of the DC-AC conversion unit, an open-loop control circuit and a first main control circuit; the first main control circuit is used for outputting a conversion control signal for controlling the work of the DC-DC conversion unit according to the first voltage feedback signal, the first main control circuit is used for controlling whether to output an open-loop control signal according to the current feedback signal, and the open-loop control circuit is used for interrupting the voltage feedback of the first voltage feedback circuit according to the open-loop control signal;
the DC input end is connected with the input end of the DC-DC conversion unit, the output end of the DC-DC conversion unit is respectively connected with the input end of the DC-AC conversion unit and the input end of the first voltage feedback circuit, the output end of the DC-AC conversion unit is connected with the alternating current output end, the output end of the DC-AC conversion unit is connected with the input end of the current feedback circuit, the output end of the first voltage feedback circuit and the output end of the current feedback circuit are both connected with the input end of the first main control circuit, the output end of the first main control circuit is connected with the control end of the DC-DC conversion unit to input the conversion control signal, the output end of the first main control circuit is connected with the input end of the open loop control circuit, and the output end of the open loop control circuit is connected with the input end of the first voltage feedback circuit.
2. The efficient inverter circuit of claim 1, wherein the DC-DC conversion unit comprises a DC-DC conversion circuit and a rectifying and filtering circuit, the direct current input terminal is connected to the input terminal of the DC-DC conversion circuit, the output terminal of the DC-DC conversion circuit is connected to the input terminal of the rectifying and filtering circuit, the output terminal of the rectifying and filtering circuit is connected to the input terminal of the DC-AC conversion unit and the input terminal of the first voltage feedback circuit, respectively, and the output terminal of the first master control circuit is connected to the control terminal of the DC-DC conversion circuit.
3. The efficient inverter circuit of claim 2, wherein the DC-DC conversion unit further comprises an LC resonant circuit, and an output terminal of the DC-DC conversion circuit is connected to an input terminal of the rectifying filter circuit through the LC resonant circuit.
4. A high efficiency inverter circuit according to any one of claims 1 to 3, wherein the first voltage feedback circuit comprises an operational amplifier and a reference voltage circuit, the output terminal of the DC-DC conversion unit is connected to the non-inverting input terminal of the operational amplifier, the output terminal of the reference voltage circuit is connected to the inverting input terminal of the operational amplifier, and the output terminal of the operational amplifier is connected to the input terminal of the first main control circuit.
5. The efficient inverter circuit of claim 4, wherein the open loop control circuit comprises a switching tube and a signal input terminal for receiving the open loop control signal, the signal input terminal is connected with a control terminal of the switching tube, a positive output terminal of the switching tube is connected with a non-inverting input terminal of the operational amplifier, and a negative output terminal of the switching tube is grounded.
6. A high efficiency inverter circuit according to any one of claims 1 to 3, wherein the DC-AC conversion unit comprises a DC-AC conversion circuit, a second voltage feedback circuit for obtaining a voltage feedback signal of the AC output end, a driving circuit and a second main control circuit, an output end of the DC-DC conversion unit is connected to an input end of the DC-AC conversion circuit, an output end of the DC-AC conversion circuit is connected to the AC output end and an input end of the current feedback circuit, the AC output end is connected to an input end of the second voltage feedback circuit, an output end of the second voltage feedback circuit is connected to an input end of the second main control circuit, an output end of the second main control circuit is connected to an input end of the driving circuit, and an output end of the driving circuit is connected to a control end of the DC-AC conversion circuit.
7. The efficient inverter circuit of claim 6, further comprising a communication circuit, wherein an output of the current feedback circuit is coupled to an input of the second master circuit, wherein the second master circuit is coupled to the communication circuit, and wherein the communication circuit is coupled to the first master circuit.
8. A high-efficiency inverter circuit according to any one of claims 1 to 3, further comprising a voltage detection circuit for acquiring a second voltage feedback signal of an input terminal of the DC-AC conversion unit, an output terminal of the DC-DC conversion unit being connected to the input terminal of the DC-AC conversion unit through the voltage detection circuit, an output terminal of the voltage detection circuit being connected to an input terminal of the first main control circuit for controlling whether to output the open-loop control signal according to the second voltage feedback signal and the current feedback signal.
9. An inverter device comprising the high-efficiency inverter circuit according to any one of claims 1 to 8.
10. A control method of the high-efficiency inverter circuit, characterized by being applied to the high-efficiency inverter circuit according to any one of claims 1 to 8, comprising:
judging whether the high-efficiency inverter circuit is overloaded or not according to the current feedback signal;
if the load is judged to be heavy, the first main control circuit outputs an open-loop control signal to the open-loop control circuit;
the open loop control circuit interrupts voltage feedback of the first voltage feedback circuit according to the open loop control signal;
the first main control circuit performs open-loop control on the DC-DC conversion unit.
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