CN110957937A - Solar voltage inverter - Google Patents
Solar voltage inverter Download PDFInfo
- Publication number
- CN110957937A CN110957937A CN201811166136.4A CN201811166136A CN110957937A CN 110957937 A CN110957937 A CN 110957937A CN 201811166136 A CN201811166136 A CN 201811166136A CN 110957937 A CN110957937 A CN 110957937A
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- inductor
- switch
- tube
- switching tube
- circuit
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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
- H02M7/5387—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 in a bridge configuration
- H02M7/53871—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 in a bridge configuration with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The inverter consists of a voltage reduction circuit and a load full-bridge circuit, and the output of the full-bridge circuit is connected with an alternating current load. The voltage dropping circuit consists of two inductors and two switching tubes. The full-bridge circuit consists of four switching tubes. The control circuit is composed of a fast comparator, a preset current waveform generator, a field effect transistor driver and a delay circuit or is composed of a sine wave PWM circuit.
Description
Technical Field
The invention belongs to an inverter, and particularly relates to a non-isolated inverter.
Background
The solar inverter generally comprises a booster circuit, a transformer conversion circuit and a conversion circuit or comprises the booster circuit and a chopper circuit, wherein the transformer conversion circuit comprises four open tubes and a high-frequency transformer and converts the output electric energy of the booster circuit into half sine wave electric energy, and the conversion circuit comprises four open tubes and converts the half sine wave electric energy output by the transformer conversion circuit into alternating current sine wave electric energy. The structure has the advantages of complex circuit, large loss, high cost and mature and reliable circuit. The non-isolated solar inverter consists of a booster circuit, four switching tubes and a chopper circuit consisting of inductors. The principle is that the boosted direct-current voltage is converted into sine-wave alternating current through a chopper circuit. The switch tube with the structure has the defects that the IGBT is required to be used, the switching speed of the IGBT is low, the switching frequency is low, a control circuit is complex, and the requirement on an output filter circuit is high. The novel puff holding structure solves the defects and has the advantages of simple structure, efficiency and the like. It is composed of a voltage-reducing circuit and a bridge type converting circuit.
Disclosure of Invention
The inverter is composed of a voltage reduction circuit and a bridge type conversion circuit, the input of the inverter is connected with the output direct current voltage of the voltage boosting circuit, and the direct current voltage is higher than the peak value of the online alternating current voltage. The working principle is as follows, the voltage reduction circuit controls the turn-off and the turn-on of a switch tube of the voltage reduction circuit according to a compared error signal by comparing the output current with the set output current phase, so that the voltage reduction circuit outputs proper half-wave alternating current electric energy. The bridge type conversion circuit converts half-wave alternating current electric energy into sine wave alternating current electric energy. The present invention is not limited to the above specific circuits, and according to the principle of the present invention, the output current is compared with the set output current to generate the control signal for controlling the output of the step-down circuit, and various circuits can be designed, which should fall within the protection scope of the present invention.
Drawings
Fig. 1 shows an inverter according to the present invention.
Fig. 2 is another inverter of the present invention.
Fig. 3 is yet another inverter of the present invention.
Fig. 4 is an analog half-wave current waveform (sinusoidal current forming circuit output).
FIG. 5 is a graph of an analog full-wave current waveform (output of a full-bridge circuit)
Fig. 6 shows that the diode and the switch tube are connected in series, and this structure can be used to replace the third switch tube Q12 in fig. 1 and the diode D10 in fig. 3 and 2.
Circuit Structure figure 1
The first switch tube Q10, the second switch tube Q11, the third switch tube Q12, the first inductor L10, the second inductor L11, the resistor R10 and the control circuit form a dc half-wave sine current forming circuit. The fourth switch tube Q13, the fifth switch tube Q14, the sixth switch tube Q15 and the seventh switch tube Q16 form a conversion circuit from direct current half-wave sinusoidal current to alternating current sinusoidal current, namely a full-bridge circuit, and the resistor R10 is connected between the switch tube Q10 and the negative electrode of the power supply to provide a signal of output current.
Working principle (half-wave sine current forming circuit)
When the pre-given current is higher than the output current of the resistor R10, the comparator sends a signal to the FET driver through some delay; the FET driver turns off the third switch tube Q12 and turns on the first switch tube Q10 and the second switch tube Q11; at this time, the direct current supplies power to the full bridge circuit through the first switch tube Q10, the second switch tube Q11, the resistor R10, the first inductor L10 and the second inductor L11, and outputs alternating current through the full bridge circuit, and at this time, the currents of the first switch tube Q10, the second switch tube Q11, the resistor R10, the first inductor L10 and the second inductor L11 start to increase; when the current through the resistor R10 increases to a predetermined current, the comparator sends a signal to the fet driver, so that the fet driver turns off the first switch Q10 and the second switch Q11, and turns on the third switch Q12. At this time, the electric energy of the first inductor L10 and the second inductor L11 supplies power to the full bridge circuit through the switching tube Q13 and outputs alternating current through the circuit, and simultaneously, the current in the first inductor L10 and the second inductor L11 starts to decrease, the current decrease is related to the alternating current instantaneous voltage, and the current decrease is larger as the voltage is higher; the current decrease is related to the delay time, i.e., the current decrease is larger the longer the delay time. The delay time determines whether the inductor current is in a continuous working current state or in an intermittent working current state. After the first switch tube Q10 and the second switch tube Q11 are turned on, the currents in the first inductor L10 and the second inductor L11 start to increase; the time for increasing the current to the given current is related to the ac instantaneous voltage, i.e., the higher the voltage, the longer the current of the first inductor L10 and the second inductor L11 increases to the given current; there are two main factors, the higher the voltage, the greater the current reduction; the higher the two voltages, the smaller the voltage difference across the inductor. The output power can be controlled by controlling the amplitude of the pre-given current or controlling (decreasing or increasing) the resistance of the detection resistor R10.
The control method of the first switch tube Q10 and the second switch tube Q11 can also adopt a PWM control method; that is, when the external circuit voltage is in a peak, the pulse width is maximum, the peak pulse width is reduced along with the reduction of the external circuit instantaneous voltage, that is, when the external circuit instantaneous voltage is zero, the peak pulse width is zero, and the control method of the third switching tube Q12 is opposite to the control method of the first switching tube Q10 and the second switching tube Q11, that is, when the external circuit instantaneous voltage is zero, the peak pulse width is maximum; when the external circuit voltage is in a peak, the peak pulse width is minimum.
Fig. 2 is substantially the same as fig. 1, and the diode D10 is used to replace the third switch Q12, and the circuit can operate in the continuous operation current state or in the discontinuous operation current state.
Fig. 3 is different from fig. 2 in that the second switching tube Q11 is not used to disconnect the switch.
Claims (10)
1. The solar inverter consists of a voltage reduction circuit, a full-bridge circuit and a controller, wherein the controller comprises a comparator, a delayer and a driver, and a preset current signal generating circuit, or the controller consists of a sinusoidal current PWM control circuit.
2. The solar inverter of claim 1, wherein the voltage step-down circuit comprises a first switch transistor, a second switch transistor, a third switch transistor, a resistor, a first inductor, and a second inductor, wherein the first switch transistor is connected in series with the first inductor, the first switch transistor is connected to the positive power supply terminal, and the first inductor serves as the positive output terminal; the second inductor, the second switch tube and the resistor are connected in series, the resistor is connected with the negative pole end of the power supply, and the second inductor is used as the output negative pole end; one end of the third switch tube is connected with the first switch tube and the first inductor, the other end of the third switch tube is connected with the second inductor and the second switch tube, or the third switch tube and the cathode of the diode, wherein the cathode of the diode is connected with the first switch tube and the first inductor, and the third switch tube is connected with the second inductor and the second switch tube.
3. The solar inverter of claim 1, wherein the voltage step-down circuit comprises a first switch transistor, a second switch transistor, a diode, a resistor, a first inductor, and a second inductor, wherein the first switch transistor is connected in series with the first inductor, the first switch transistor is connected to the positive power supply terminal, and the first inductor serves as the positive output terminal; the second inductor, the second switch tube and the resistor are connected in series, the resistor is connected with the negative pole end of the power supply, and the second inductor is used as the output negative pole end; the cathode of the diode is connected with the first switch tube and the first inductor, the anode of the diode is connected with the second inductor and the second switch tube, or the cathode of the diode is connected with the first switch tube and the first inductor, and the third switch tube is connected with the second inductor and the second switch tube.
4. The solar inverter according to claim 1, wherein the voltage step-down circuit comprises a second switching transistor, a resistor, a diode, a first inductor and a second inductor, wherein one end of the first inductor is connected in series with the positive power supply terminal, and the other end of the first inductor serves as the positive output terminal; the second inductor, the second switch tube and the resistor are connected in series, the resistor is connected with the negative pole end of the power supply, and the second inductor is used as the output negative pole end; the cathode of the diode is connected with the first inductor and the positive end of the power supply, the anode of the diode is connected with the second inductor and the second switch tube, or the cathode of the diode is connected with the positive end of the power supply and the first inductor, and the third switch tube is connected with the second inductor and the second switch tube.
5. The solar inverter of claim 1, wherein the full bridge circuit comprises a fourth switching tube, a fifth switching tube, a sixth switching tube, and a seventh switching tube, wherein the fourth switching tube is connected in series with the fifth switching tube, and the sixth switching tube is connected in series with the seventh switching tube; the fourth switching tube is connected with the sixth switching tube, and the fifth switching tube is connected with the seventh switching tube; the fourth switching tube and the fifth switching tube are used as first inductors of which the input positive terminals are connected with the voltage reduction circuit, and the fifth switching tube is connected with the seventh switching tube and is used as a second inductor of which the input negative terminals are connected with the voltage reduction circuit; and the joint of the fourth switching tube and the fifth switching tube and the joint of the sixth switching tube and the seventh switching tube are used as alternating current output ends.
6. The solar inverter as claimed in claim 1, wherein the control circuit is composed of a fast comparator, a delay circuit, a fet driver, and a predetermined current signal generating circuit.
7. According to claims 1, 2, 3, 4, the solar inverter is characterized in that the control circuit consists of a sinusoidal current PWM control circuit.
8. The solar inverter as claimed in claim 6, wherein the predetermined current signal generating circuit is composed of an on-line ac voltage transforming circuit and an auxiliary up-down signal generating circuit, or a microprocessor and an auxiliary up-down signal generating circuit, or an analog signal generator.
9. The solar inverter according to claim 2 or 6, wherein the comparator compares the predetermined current signal with the signal on the resistor and generates a control signal, and when the predetermined current signal is smaller than the signal on the resistor, the control signal turns off the first switching tube and the second switching tube and turns on the third switching tube; when the preset current signal is larger than the signal on the resistor, the signal turns on the first switch tube and the second switch tube through a small delay, and turns off the third switch tube.
10. The solar inverter of claim 3, 4 or 6, wherein the current comparator compares the predetermined current signal with the resistive up signal and generates the control signal, the control signal turning off the first switch and the second switch when the predetermined current signal is less than the resistive up signal, and the control signal turning on the first switch and the second switch with a small delay when the predetermined current signal is greater than the resistive up signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811166136.4A CN110957937A (en) | 2018-09-27 | 2018-09-27 | Solar voltage inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811166136.4A CN110957937A (en) | 2018-09-27 | 2018-09-27 | Solar voltage inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110957937A true CN110957937A (en) | 2020-04-03 |
Family
ID=69975392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811166136.4A Pending CN110957937A (en) | 2018-09-27 | 2018-09-27 | Solar voltage inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110957937A (en) |
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2018
- 2018-09-27 CN CN201811166136.4A patent/CN110957937A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200403 |
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| WD01 | Invention patent application deemed withdrawn after publication |