TWI478477B - Three-port single-phase single-stage micro-inverter and operation method thereof - Google Patents

Description

Three-phase single-phase single-stage converter and operation method thereof

The invention relates to a three-turn single-phase single-stage converter and an operation method thereof, in particular to a three-turn single-phase single-stage converter with simple control method, low energy conversion frequency and high conversion efficiency, and operation method thereof .

In general, the input 埠 of the converter must have the function of maximum power point tracking (MPPT) to capture the maximum power point (MPP) of the solar panel. After the input of the inverter absorbs the energy of the solar panel, the modulation of the inverter will output a full-wave rectified sine wave current. Then, the low frequency switching phase converter converts the full wave rectified sine wave current into an alternating current and transmits it to the mains. In the prior art, the inverter utilizes a high capacitance electrolytic capacitor to modulate the DC input power of the solar panel and the AC output power of the inverter. That is, when the input power of the solar panel is greater than the output power of the inverter, the high-capacity electrolytic capacitor absorbs the difference between the input power of the solar panel and the output power of the inverter; when the input power of the solar panel is less than that of the inverter When the power is output, the high-capacity electrolytic capacitor releases the difference to the mains through the commutator. However, high-capacity electrolytic capacitors have disadvantages such as large volume, short life, and low reliability.

An embodiment of the invention provides a three-turn single-phase single-stage inverter. The three-phase single-phase single-stage converter includes an input 埠, a modulation 埠, a controller, a phase changer and a main Dynamic power decoupling circuit埠. The input port is configured to be coupled to the DC power source and receive and transmit the input power of the DC power source; the modulation port is configured to magnetically couple the input port, and generate and output a full-wave rectification according to the input power The sinusoidal current; the controller is configured to generate a switch control signal, an inverting switch control signal, a first pulse width modulation control signal, and a second pulse width modulation control signal; the phase converter is coupled Connected to the modulation 埠, according to the switch control signal and the reverse switch control signal, convert the full-wave rectified sine wave current into an alternating current, and output the alternating current to a load or mains. The frequency of the switch control signal and the reverse switch control signal is the same as the frequency of the mains; the modulation 调 is based on the first pulse width modulation control signal, and outputs the full-wave rectified sine current to the inverter The active power decoupling circuit modulates the difference between the DC input power and the output AC power according to the second pulse width modulation control signal. When the second pulse width modulation control signal is deactivated, the active power The decoupling circuit outputs the difference to the inverter through the modulation, and the controller controls the enabling time of the first pulse width modulation control signal according to the output power.

Another embodiment of the present invention provides a method for operating a three-turn single-phase single-stage converter including an input 埠, a modulation 埠, a controller, and a phase changer. And an active power decoupling circuit. The operation method includes the input 埠 receiving and transmitting the input power of the DC power source; the modulation 调 modulating the control signal according to a first pulse width, and the active power decoupling circuit modulating the control signal according to a second pulse width , perform the corresponding action.

The invention provides a three-turn single-phase single-stage converter and an operation method thereof. The three orders The phase single-stage converter and the operation method use a modulation transformer to adjust the control signal according to a first pulse width, and an active power decoupling circuit to perform a corresponding control signal according to a second pulse width modulation control signal. action. Therefore, compared with the prior art, the present invention has the following advantages: First, the present invention can effectively store a magnetizing inductor energy to the active power decoupling circuit and transmit it to a load or mains to reduce losses and improve the three. The conversion efficiency of the single-phase single-stage converter; second, the control method of the present invention is an average current control method and the three-phase single-phase single-stage converter can be operated in a continuous current mode (CCM) Therefore, the number of operation modes of the present invention is small, the control method is simple, the number of energy conversions is small, and the conversion efficiency is high. Third, since the capacitance in the active power decoupling circuit is connected in series with the second coil of the modulation 埠, The ratio of the turns of the first coil to the second coil of the three-turn single-phase single-stage inverter and the ratio of the turns of the first coil to the third coil are not high, resulting in a larger operating voltage range of the DC power supply. Fourth, the three-turn single-phase single-stage converter provided by the present invention does not require a high-capacitance electrolytic capacitor.

Please refer to FIG. 1. FIG. 1 is a schematic diagram showing a three-turn single-phase single-stage inverter 100 according to an embodiment of the present invention. The three-phase single-phase single-stage inverter 100 includes an input port 102, a modulation block 104, a controller 106, a phase changer 108, and an active power decoupling circuit 110. The input port 102 is configured to be coupled to the DC power source 112 and receive and transmit the input power PDC of the DC power source 112. The DC power source 112 is a solar panel, and the input port 102 has a maximum power point (maximum power point). Tracking) features. However, the present invention is not limited to the DC power source 112 being a solar panel. Modulation 埠 104 is used to magnetically couple input 埠 102. The controller 106 is configured to generate a switch control signal SCS and an inverting switch control signal. a first pulse width modulation control signal FPWM and a second pulse width modulation control signal SPWM. The phase changer 108 is coupled to the modulation buffer 104 for controlling signals according to the switch control signal SCS and the inverting switch Converting the full-wave rectified sine wave current into an alternating current IAC and outputting the alternating current IAC to a mains AC, wherein the switch control signal SCS and the inverting switch control signal The frequency is the same as the frequency of the mains AC. However, the present invention is not limited to outputting an alternating current IAC to a commercial AC, and may also output an alternating current IAC to a general alternating current load. As shown in FIG. 1, the modulation buffer 104 is further configured to output a full-wave rectified sine wave current to the inverter 108 according to the first pulse width modulation control signal FPWM and the input power PDC. In addition, the active power decoupling circuit 埠110 is configured to store a difference between the input power PDC and the output power PAC output by the inverter 108 according to the second pulse width modulation control signal SPWM, and when the second pulse width modulation control signal When the SPWM is deenergized, the active power decoupling circuit 埠110 outputs the difference between the input power PDC and the output power PAC output by the inverter 108 to the inverter 108 through the modulation 埠104. In addition, the controller 106 controls the enable time of the first pulse width modulation control signal FPWM according to the output power PAC output by the inverter 108.

As shown in FIG. 1, the input port 102 includes a first coil 1022, a magnetizing inductance 1024, and a first switch 1026. The first coil 1022 has a first end coupled to the first end of the DC power source 112 and a second end. The second end of the DC power source 112 is coupled to a ground GND. The magnetizing inductor 1024 has a first end coupled to the first end of the DC power source 112, and a second end coupled to the first coil 1022. Second end; first The switch 1026 has a first end coupled to the second end of the first coil 1022, a second end for receiving a control signal CS, and a third end coupled to the ground GND, wherein the first switch 1026 is turned on (ON) and turned off (OFF) according to the control signal CS.

As shown in FIG. 1 , the modulation transistor 104 includes a second coil 1042 , a second switch 1044 , a first diode 1046 , a first inductor 1048 , and a second capacitor 1082 . The second coil 1042 has a first end and a second end coupled to the ground GND. The second switch 1044 has a first end and a second end for receiving the first pulse width modulation control signal FPWM. And a third terminal, wherein the second switch 1044 is turned on (ON) and turned off (OFF) according to the first pulse width modulation control signal FPWM; the first diode 1046 has a first end coupled to the ground end GND, and a second end, coupled to the third end of the second switch 1044; the first inductor 1048 has a first end, coupled to the second end of the first diode 1046, and a second end; The second capacitor 1082 has a first end coupled to the second end of the first inductor 1048 and a second end coupled to the ground GND.

As shown in FIG. 1 , the active power decoupling circuit 埠 110 includes a third coil 1102 , a second diode 1104 , a third switch 1106 , a second inductor 1108 , a third diode 1110 , and a first The first capacitor 1112. The third coil 1102 has a first end and a second end. The second diode 1104 has a first end coupled to the second end of the third coil 1102 and a second end. The third switch 1106 The first end is coupled to the second end of the second diode 1104, and the second end is configured to receive the second pulse width modulation control signal SPWM, and a third end, wherein the third switch 1106 is The second pulse width modulation control signal SPWM is turned on (ON) and turned off (OFF); the second inductor 1108 has a first end coupled to the first end of the third coil 1102, and a second end coupled to the third end of the third switch 1106; the third diode 1110 has a first end coupled to a first end of the third coil 1102, and a second end; the first capacitor 1112 has a first end coupled to the second end of the second inductor 1108, and a second end coupled to the third diode The second end of the body 1110.

As shown in FIG. 1 , the phase changer 108 includes a fourth switch 1084 , a fifth switch 1086 , a sixth switch 1088 , a seventh switch 1090 , and a third inductor 1092 . The fourth switch 1084 has a first end coupled to the first end of the second capacitor 1082, a second end for receiving the switch control signal SCS, and a third end; the fifth switch 1086 has a first end The first end of the second capacitor 1082 is coupled to the second end for receiving the inverting switch control signal. And a third end coupled to the second end of the mains AC; the sixth switch 1088 has a first end coupled to the third end of the fourth switch 1084, and a second end for receiving the inverting switch Control signal And a third end coupled to the ground GND; the seventh switch 1090 has a first end coupled to the third end of the fifth switch 1086, and a second end for receiving the switch control signal SCS, and a third end is coupled to the ground end GND; the third inductor 1092 has a first end coupled to the third end of the fourth switch 1084, and a second end coupled to the first end of the mains AC The third inductor 1092 is a high frequency component for filtering out the current IR on the first inductor 1048.

In addition, as shown in FIG. 1, the three-turn single-phase single-stage inverter 100 further includes a filter capacitor 114. The filter capacitor 114 has a first end coupled to the first end of the DC power source 112, and a second end coupled to the second end of the DC power source 112, wherein the filter capacitor 114 is used to filter out the high frequency current flowing through the switch 1026.

As shown in FIG. 1, the sensing direction of the second coil 1042 is the same as the sensing direction of the first coil 1022, and the sensing direction of the third coil 1102 is opposite to the sensing direction of the first coil 1022. In addition, the input power PDC of the DC power source 112 is equal to the product of the DC voltage VDC and the DC current IDC provided by the DC power source 112, and the output power PAC output by the inverter 108 is equal to the AC current VAC of the AC current and the AC AC. The product of DC current IDC is related to the function of maximum power tracking of input port 102, and controller 106 controls the enable time of second pulse width modulation control signal SPWM according to DC current IDC.

As shown in FIG. 1, the controller 106 generates switching control according to the DC voltage VDC, the DC current IDC, the current IR outputted to the second capacitor 1082, the voltage across the first capacitor 1112, and the AC voltage VAC. Signal SCS, inverting switch control signal The first pulse width modulation control signal FPWM and the second pulse width modulation control signal SPWM. In addition, the controller 106 is further configured to perform an OR logic operation on the first pulse width modulation control signal FPWM and the second pulse width modulation control signal SPWM to determine the enable time of the control signal CS. Therefore, in one switching cycle of the pulse width modulation control signal, the controller 106 can control the signal through the switch control signal SCS and the inverting switch. The first pulse width modulation control signal FPWM, the control signal CS and the second pulse width modulation control signal SPWM control the three-phase single-phase single-stage inverter 100 to store the difference between the input power PDC and the output power PAC to the active power The first capacitor 1112 of the decoupling circuit 110 is decoupled. The input power PDC and the first capacitor 1112 are further provided by the DC power source 112 to provide a difference between the input power PDC and the output power PAC to the first inductor 1048.

Please refer to Figures 2 to 6. 2 is a diagram illustrating the control signal CS, the first pulse width modulation control signal FPWM, the second pulse width modulation control signal SPWM, the current IR flowing through the first inductor 1048, and the current IL flowing through the second inductor 1108. Schematic diagram of relationship, FIG. 3 is a schematic diagram for explaining three-phase single-phase single-stage inverter 100 in mode I, and FIG. 4 is a schematic diagram for explaining three-phase single-phase single-stage inverter 100 in mode II, FIG. It is a schematic diagram illustrating the three-phase single-phase single-stage inverter 100 in mode III and FIG. 6 is a schematic diagram illustrating the three-phase single-phase single-stage inverter 100 in mode IV.

As shown in FIGS. 2 and 3, in mode I, since the controller 106 enables the first pulse width modulation control signal FPWM, the second pulse width modulation control signal SPWM, and the control signal CS, the first switch 1026. The second switch 1044 and the third switch 1106 are turned on. Therefore, the input power PDC received by the input port 102 is stored to the first inductor 1048 and the second inductor 1108, and the magnetizing inductance 1024 is charged. The second inductor 1108 is the difference between the stored input power PDC and the output power PAC, and the current IR flowing through the first inductor 1048 and the current IL flowing through the second inductor 1108 are increased. In addition, in mode I, the controller 106 can determine the ON time of the second switch 1044 (that is, the enable time of the first pulse width modulation control signal FPWM) according to the AC voltage VAC and the current IR, and control The timer 106 can control the ON time of the third switch 1106 according to the maximum value of the input power PDC.

As shown in FIG. 2 and FIG. 4, in mode II, since the controller 106 enables the second pulse width modulation control signal SPWM and the control signal CS, and the first pulse width modulation control signal FPWM, The first switch 1026 and the third switch 1106 are turned "ON", and the second switch 1044 is turned "OFF". Therefore, when the second switch 1044 is turned "OFF" and the third switch 1106 is turned "ON", the stored power of the first inductor 1048 is output to the inverter 108, and the input power PDC received from the input port 102 is stored to The second inductor 1108 charges the magnetizing inductance 1024, the current IR decreases, and the current IL increases. That is, when the switching period of the pulse width modulation control signal is close to the zero crossing point of the AC voltage VAC, the power required by the commercial AC is lower, so the enabling time of the first pulse width modulation control signal FPWM is less than The enable time of the two pulse width modulation control signal SPWM causes the power stored by the first inductor 1048 to be output to the inverter 108, and the input power PDC received from the input port 102 is stored to the second inductor 1108.

As shown in FIGS. 2 and 5, in mode III, since the controller 106 enables the first pulse width modulation control signal FPWM and the control signal CS, and the second pulse width modulation control signal SPWM, The first switch 1026 and the second switch 1044 are turned "ON", and the third switch 1106 is turned "OFF". Therefore, when the second switch 1044 is turned on and the third switch 1106 is turned off, the magnetizing inductance 1024 is charged, and the difference between the input power PDC stored by the second inductor 1108 and the output power PAC is stored to the first capacitor through the third diode 1110. 1112, and passed through the first capacitor 1112 to the inverter 108, the input power PDC received from the input port 102 is stored to the first inductor 1048, the current IR is increased, and the current IL is decreased. That is, when the pulse width modulation control signal is When the switching period is close to the peak value of the AC voltage VAC, the power required by the commercial AC is higher, so the enabling time of the first pulse width modulation control signal FPWM is greater than the enabling time of the second pulse width modulation control signal SPWM. The difference between the input power PDC stored by the second inductor 1108 and the output power PAC is output to the inverter 108, and the input power PDC received from the input port 102 is stored to the first inductor 1048.

As shown in FIG. 2 and FIG. 6, in mode IV, since the controller 106 can disable the first pulse width modulation control signal FPWM, the second pulse width modulation control signal SPWM, and the control signal CS, the first switch 1026. The second switch 1044 and the third switch 1106 are turned off (OFF). Therefore, when the first switch 1026, the second switch 1044, and the third switch 1106 are all turned OFF, the power stored by the first inductor 1048 is output to the inverter 108, and the stored power of the second inductor 1108 is transmitted through the first The triode 1110 is stored to the first capacitor 1112, and the stored power of the magnetizing inductor 1024 is stored to the first capacitor 1112 through the first diode 1046. Since the second switch 1044 and the third switch 1106 are turned off, both the current IR and the current IL are lowered.

Therefore, as shown in FIG. 2, when the switching period of the pulse width modulation control signal is close to the zero crossing point of the AC voltage VAC, the three-turn single-phase single-stage inverter 100 is in the pulse width modulation control signal. The operation sequence in one switching cycle is mode I→mode II→mode IV; and when the switching period of the pulse width modulation control signal is close to the peak value of the alternating voltage VAC, the three-turn single-phase single-stage inverter 100 is in the above pulse. The operation sequence in one switching cycle of the width modulation control signal is mode I→mode III→mode IV.

Please refer to FIG. 1 , FIG. 2 , FIG. 3 , FIG. 4 , FIG. 5 , FIG . 6 , and FIG. 7 . FIG. 7 illustrates a three-phase single-phase single-stage according to another embodiment of the present invention. Flow chart of the operation method of the inverter. The method of Figure 7 is illustrated by the three-phase single-phase single-stage converter 100 of Figure 1, the detailed steps are as follows: Step 700: Start; Step 702: Input 埠102 receives and transmits the input power PDC of the DC power source 112; 704: When the switching period of the pulse width modulation control signal is close to the zero crossing point of the AC voltage VAC, proceed to step 706; when the switching period of the pulse width modulation control signal is close to the peak value of the alternating voltage VAC, proceed to step 712; 706: The input power PDC received from the input port 102 is stored to the first inductor 1048 and the second inductor 1108; step 708: the stored power of the first inductor 1048 is output to the inverter 108, and received from the input port 102. The input power PDC is stored to the second inductor 1108; in step 710, the stored power of the first inductor 1048 is output to the inverter 108, and the stored power of the second inductor 1108 is stored to the first capacitor through the third diode 1110. 1112, and the stored power of the magnetizing inductance 1024 is stored through the first diode 1046 to the first capacitor 1112, and jumps back to step 704; Step 712: The input power PDC received from the input port 102 is stored to the first inductor 1048 and the second inductor 1108. Step 714: The stored power of the second inductor 1108 is stored to the first capacitor 1112 through the third diode 1110. And the input power PDC received from the input port 102 is stored to the first inductor 1048; step 716: the power stored by the first inductor 1048 is output to the inverter 108, and the stored power of the second inductor 1108 is transmitted through the third diode The body 1110 is stored to the first capacitor 1112, and the stored power of the magnetizing inductor 1024 is stored through the first diode 1046 to the first capacitor 1112, and the process returns to step 704.

As shown in FIG. 2, when the switching period of the pulse width modulation control signal is close to the zero crossing point of the AC voltage VAC, the three-turn single-phase single-stage inverter 100 switches at the pulse width modulation control signal. The order of operations in the cycle is mode I → mode II → mode IV.

As shown in FIG. 2 and FIG. 3, in step 706 (mode I), since the controller 106 enables the first pulse width modulation control signal FPWM, the second pulse width modulation control signal SPWM, and the control signal CS, Therefore, the first switch 1026, the second switch 1044, and the third switch 1106 are turned on. Therefore, the input power PDC received by the input port 102 is stored to the first inductor 1048 and the second inductor 1108, and the magnetizing inductance 1024 is charged, wherein the second inductor 1108 is the difference between the stored input power PDC and the output power PAC, and the current IR And the current IL flowing through the second inductor 1108 is increased. In addition, in mode I, control The controller 106 can determine the turn-on time of the second switch 1044 (ie, the enable time of the first pulse width modulation control signal FPWM) according to the AC voltage VAC and the current IR, and the maximum value of the controller 106 according to the input power PDC The opening time of the third switch 1106 is controlled.

As shown in FIGS. 2 and 4, in step 708 (mode II), since the controller 106 enables the second pulse width modulation control signal SPWM and the control signal CS, and the de-energizing first pulse width modulation control Signal FPWM, so first switch 1026 and third switch 1106 are on, and second switch 1044 is off. Therefore, when the second switch 1044 is turned off and the third switch 1106 is turned on, the stored power of the first inductor 1048 is output to the inverter 108, and the input power PDC received from the input port 102 is stored to the second inductor 1108, and the excitation is performed. The inductor 1024 is charged, the current IR is lowered, and the current IL is increased. That is, when the switching period of the pulse width modulation control signal is close to the zero crossing point of the AC voltage VAC, the power required by the commercial AC is lower, so the enabling time of the first pulse width modulation control signal FPWM is less than The enable time of the two pulse width modulation control signal SPWM causes the power stored by the first inductor 1048 to be output to the inverter 108, and the input power PDC received from the input port 102 is stored to the second inductor 1108.

As shown in FIG. 2 and FIG. 6, in step 710 (mode IV), since the controller 106 disables the first pulse width modulation control signal FPWM, the second pulse width modulation control signal SPWM, and the control signal CS, Therefore, the first switch 1026, the second switch 1044, and the third switch 1106 are turned off. Therefore, when the first switch 1026 and the second switch 1044 When the third switch 1106 is turned off, the power stored by the first inductor 1048 is output to the inverter 108, and the stored power of the second inductor 1108 is stored through the third diode 1110 to the first capacitor 1112, and the magnetizing inductance. The stored power of 1024 is stored to the first capacitor 1112 through the first diode 1046. Since the second switch 1044 and the third switch 1106 are turned off, both the current IR and the current IL are lowered.

In addition, when the switching period of the pulse width modulation control signal is close to the peak value of the AC voltage VAC, the operation sequence of the three-phase single-phase single-stage inverter 100 in one switching period of the pulse width modulation control signal is mode I. → Mode III → Mode IV, where Mode I and Mode IV are not described again.

As shown in FIGS. 2 and 5, in step 714 (mode III), since the controller 106 enables the first pulse width modulation control signal FPWM and the control signal CS, and the de-energized second pulse width modulation control Signal SPWM, so first switch 1026 and second switch 1044 are turned on, and third switch 1106 is turned off. Therefore, when the second switch 1044 is turned on and the third switch 1106 is turned off, the magnetizing inductance 1024 is charged, and the difference between the input power PDC stored by the second inductor 1108 and the output power PAC is stored to the first capacitor through the third diode 1110. 1112, and passed through the first capacitor 1112 to the inverter 108, the input power PDC received from the input port 102 is stored to the first inductor 1048, the current IR is increased, and the current IL is decreased. That is, when the switching period of the pulse width modulation control signal is close to the peak value of the AC voltage VAC, the power required by the commercial AC is higher, so the enabling time of the first pulse width modulation control signal FPWM is greater than the second pulse width. Modulating the enable time of the control signal SPWM, resulting in the second inductor 1108 The difference between the stored input power PDC and the output power PAC is output to the inverter 108, and the input power PDC received from the input port 102 is stored to the first inductor 1048.

In summary, the three-phase single-phase single-stage converter provided by the present invention and the operation method thereof are characterized by using a modulation 埠 according to a first pulse width modulation control signal, and an active power decoupling circuit 埠 according to a second pulse width. Modulate the control signal and perform the corresponding action. Therefore, compared with the prior art, the present invention has the following advantages: First, the present invention can effectively store the magnetizing inductance energy into the active power decoupling circuit and transmit it to the commercial power to reduce the loss and improve the three-phase single-phase single-stage switching. The conversion efficiency of the flow device; second, the control method of the present invention is an average current control method and the three-phase single-phase single-stage inverter is operated in a continuous current mode (CCM), so the number of operation modes of the present invention Less, simple control method, less energy conversion and high conversion efficiency; third, because the capacitance in the active power decoupling circuit is connected in series with the second coil of the modulated 埠, so the first of the three-phase single-phase single-stage converter The ratio of the number of turns of the coil to the second coil and the ratio of the turns of the first coil to the third coil can be reduced, resulting in a larger operating voltage range of the DC power supply; fourth, the three-phase single-phase single-stage converter does not need High capacitance electrolytic capacitors.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧Three-Phase Single-Phase Single-Level Inverter

102‧‧‧ Input埠

104‧‧‧调调

106‧‧‧ Controller

108‧‧‧Commutator

110‧‧‧Active power decoupling circuit

112‧‧‧DC power supply

114‧‧‧Filter capacitor

1022‧‧‧First coil

1024‧‧‧Magnetic inductance

1026‧‧‧First switch

1042‧‧‧second coil

1044‧‧‧Second switch

1046‧‧‧First Diode

1048‧‧‧first inductance

1082‧‧‧second capacitor

1084‧‧‧fourth switch

1086‧‧‧ fifth switch

1088‧‧‧ sixth switch

1090‧‧‧ seventh switch

1092‧‧‧ Third inductance

1102‧‧‧third coil

1104‧‧‧Secondary

1106‧‧‧third switch

1108‧‧‧second inductance

1110‧‧‧ Third Dipole

1112‧‧‧first capacitor

AC‧‧‧Power

CS‧‧‧Control signal

FPWM‧‧‧First pulse width modulation control signal

GND‧‧‧ ground

IDC‧‧‧ DC current

IAC‧‧‧AC current

IR, IL‧‧‧ current

SCS‧‧‧ switch control signal

‧‧‧Inverted switch control signal

SPWM‧‧‧Second pulse width modulation control signal

VDC‧‧‧ DC voltage

VAC‧‧‧AC voltage

VX‧‧‧cross-voltage of the first capacitor

700-716‧‧‧Steps

Fig. 1 is a schematic view showing a three-turn single-phase single-stage inverter according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing the relationship between the control signal, the first pulse width modulation control signal, the second pulse width modulation control signal, the control signal, the current flowing through the first inductor, and the current flowing through the second inductor.

Figure 3 is a schematic diagram showing the mode III of a three-phase single-phase single-stage converter.

Figure 4 is a schematic diagram showing the three-phase single-phase single-stage converter in mode II.

Figure 5 is a schematic diagram showing the three-phase single-phase single-stage converter in mode III.

Figure 6 is a schematic diagram showing the three-phase single-phase single-stage converter in mode IV.

Figure 7 is a flow chart showing a method of operating a three-turn single-phase single-stage inverter according to another embodiment of the present invention.

100‧‧‧Three-Phase Single-Phase Single-Level Inverter

102‧‧‧ Input埠

104‧‧‧调调

106‧‧‧ Controller

108‧‧‧Commutator

110‧‧‧Active power decoupling circuit

112‧‧‧DC power supply

114‧‧‧Filter capacitor

1022‧‧‧First coil

1024‧‧‧Magnetic inductance

1026‧‧‧First switch

1042‧‧‧second coil

1044‧‧‧Second switch

1046‧‧‧First Diode

1048‧‧‧first inductance

1082‧‧‧second capacitor

1084‧‧‧fourth switch

1086‧‧‧ fifth switch

1088‧‧‧ sixth switch

1090‧‧‧ seventh switch

1092‧‧‧ Third inductance

1102‧‧‧third coil

1104‧‧‧Secondary

1106‧‧‧third switch

1108‧‧‧second inductance

1110‧‧‧ Third Dipole

1112‧‧‧first capacitor

AC‧‧‧Power

CS‧‧‧Control signal

FPWM‧‧‧First pulse width modulation control signal

GND‧‧‧ ground

IDC‧‧‧ DC current

IAC‧‧‧AC current

IR, IL‧‧‧ current

SCS‧‧‧ switch control signal

‧‧‧Inverted switch control signal

SPWM‧‧‧Second pulse width modulation control signal

VDC‧‧‧ DC voltage

VAC‧‧‧AC voltage

VX‧‧‧cross-voltage of the first capacitor

Claims (23)

A three-phase single-phase single-stage converter includes: an input port coupled to a DC power source and receiving and transmitting input power of the DC power source; and a modulation switch for magnetically coupling the input port, And generating and outputting a full-wave rectified sine wave current according to the input power; a controller for generating a switch control signal, an inverting switch control signal, a first pulse width modulation control signal, and a second a pulse width modulation control signal; a phase changer coupled to the modulation 埠 to convert the full-wave rectified sine wave current into an alternating current according to the switch control signal and the reverse switch control signal, and Outputting the alternating current to a load or a mains, wherein the switch control signal and the reverse switch control signal have the same frequency as the mains; and an active power decoupling circuit (APDC); Modulating 埠 according to the first pulse width modulation control signal, outputting the full-wave rectified sine wave current to the inverter, the active power decoupling circuit 调 according to the second pulse width modulation control a signal storing a difference between the input power and the output power. When the second pulse width modulation control signal is deactivated, the active power decoupling circuit outputs the difference to the inverter through the modulation signal. And the controller controls the first pulse width according to the output power The modulation time of the modulation control signal; wherein the modulation transformer, the inverter and the active power decoupling circuit are controlled by the switch, the reverse switch control signal, and the first pulse width modulation control signal And the second pulse width modulation control signal control method is an average current control method and the three-turn single-phase single-stage inverter is operated in a continuous current mode. The three-phase single-phase single-stage converter according to claim 1, wherein the DC power source is a solar panel. The three-phase single-phase single-stage inverter according to claim 2, wherein the input port has a function of maximum power point tracking. The three-phase single-phase single-stage converter according to claim 3, wherein the input port comprises: a first coil having a first end coupled to the first end of the DC power source, and a second end The second end of the DC power source is coupled to a ground end; a magnetizing inductor having a first end coupled to the first end of the DC power source and a second end coupled to the first end a second end of the coil; and a first switch having a first end coupled to the second end of the first coil, a second end for receiving a control signal, and a third end coupled At the ground end, the first switch is turned on (ON) and turned off (OFF) according to the control signal. The three-phase single-phase single-stage converter according to claim 4, wherein the modulation 埠 includes: a second coil having a first end and a second end coupled to the ground end; The second switch has a first end and a second end for receiving the first pulse width modulation control signal and a third end, wherein the second switch is turned on according to the first pulse width modulation control signal And a first diode having a first end coupled to the ground end and a second end coupled to the third end of the second switch; a first inductor having a first The second end is coupled to the second end of the first diode and the second end; and a second capacitor has a first end coupled to the second end of the first inductor, and a second The end is coupled to the ground end. The three-phase single-phase single-stage converter according to claim 5, wherein the active power decoupling circuit includes: a third coil having a first end and a second end; and a second diode The first end is coupled to the second end of the third coil, and the second end. The third switch has a first end coupled to the second end of the second diode. a second end, configured to receive the second pulse width modulation control signal, and a third end, wherein the third switch is based on the second pulse width modulation control signal ON (ON) and OFF (OFF); a second inductor having a first end coupled to the first end of the third coil, and a second end coupled to the third end of the third switch; a third diode having a first end coupled to the first end of the third coil and a second end; and a first capacitor having a first end coupled to the second inductor The second end and the second end are coupled to the second end of the third diode. The three-phase single-phase single-stage converter according to claim 6, wherein the phase changer comprises: a fourth switch having a first end coupled to the first end of the second capacitor, and a second The first end is coupled to the first end of the second capacitor, and the second end is configured to receive the reverse phase. The first switch is coupled to the first end of the second capacitor and the second end is configured to receive the reverse phase. a switch control signal, and a third end coupled to the second end of the mains; a sixth switch having a first end coupled to the third end of the fourth switch and a second end Receiving the inverting switch control signal, and a third end coupled to the ground end; a seventh switch having a first end coupled to the third end of the fifth switch, a second end, Receiving the switch control signal, and a third end coupled to the ground end; and a third inductor having a first end coupled to the third end of the fourth switch, and a second end The first end of the utility is coupled to the utility. The three-phase single-phase single-stage converter according to claim 7, further comprising: a voltage stabilizing capacitor having a first end coupled to the first end of the DC power supply and a second end coupled At the second end of the DC power supply, wherein the voltage stabilizing capacitor It is used to stabilize the DC voltage provided by the DC power supply. The three-turn single-phase single-stage inverter according to claim 8, wherein the sensing direction of the second coil is the same as the sensing direction of the first coil, and the sensing direction of the third coil is the first coil The sensing direction is reversed. The three-phase single-phase single-stage converter according to claim 8, wherein the input power is equal to a product of the DC voltage and a DC current provided by the DC power source, wherein the DC current is related to the maximum power tracking, And the controller controls the enabling time of the second pulse width modulation control signal according to the DC current. A three-phase single-phase single-stage inverter as claimed in claim 8, wherein the output power is equal to a product of the alternating current and the voltage of the mains. The three-phase single-phase single-stage inverter according to claim 8, wherein when the first switch, the second switch, and the third switch are turned on, input power received from the input port is stored to the first The inductor and the second inductor, wherein the second inductor stores a difference between the input power and the output power. The three-phase single-phase single-stage inverter according to claim 8, wherein when the second switch is turned off and the third switch is turned on, power stored by the first inductor is output to the inverter, and The input power received by the input port is stored to the second inductor. The three-phase single-phase single-stage inverter according to claim 8, wherein when the second switch is turned on (ON) and the third switch is turned off (OFF), the power stored by the second inductor passes through the third The diode is stored to the first capacitor, and input power received from the input port is stored to the first inductor. The three-phase single-phase single-stage inverter according to claim 12, wherein when the first switch, the second switch, and the third switch are both turned OFF, the stored power of the first inductor is output. The power stored in the second inductor is stored to the first capacitor through the third diode, and the stored power of the magnetizing inductor is stored to the first capacitor through the first diode. The three-phase single-phase single-stage inverter according to claim 12, 13, 14, or 15, wherein the enable time of the control signal is an enable time of the second pulse width modulation control signal and the first The enable time of the pulse width modulation control signal is determined by one or a logical operation. The three-phase single-phase single-stage inverter of claim 16, wherein the magnetizing inductance is charged when the control signal is enabled. A three-phase single-phase single-stage converter operating method, the three-turn single-phase single-stage converter includes an input 埠, a modulation 埠, a controller, a phase changer and an active power decoupling circuit , the operation method includes: The input port receives and transmits the input power of the DC power source; and when a first pulse width modulation control signal and a second pulse width modulation control signal are enabled, the input power received from the input port is stored to the input power The first inductance of the modulation 埠 and the second inductance of the active power decoupling circuit ,, wherein the second inductance is to store the difference between the input power and the output power. A three-phase single-phase single-stage converter operating method, the three-turn single-phase single-stage converter includes an input 埠, a modulation 埠, a controller, a phase changer and an active power decoupling circuit The operation method includes: the input 埠 receiving and transmitting the input power of the DC power source; and when a first pulse width modulation control signal can be enabled and a second pulse width modulation control signal is enabled, the modulation 埠The stored power of the first inductor is output to the inverter, and the input power received from the input port is stored to the second inductance of the active power decoupling circuit. A three-phase single-phase single-stage converter operating method, the three-turn single-phase single-stage converter includes an input 埠, a modulation 埠, a controller, a phase changer and an active power decoupling circuit The operation method includes: the input 埠 receiving and transmitting the input power of the DC power source; and when the first pulse width modulation control signal enable and the second pulse width modulation control signal are deactivated, the active power solution The stored power of the second inductor of the coupling circuit is stored to the first capacitor of the active power decoupling circuit 透过 through the third diode of the active power decoupling circuit, and received from the input 埠 The input power is stored to the first inductance of the modulation 埠. A three-phase single-phase single-stage converter operating method, the three-turn single-phase single-stage converter includes an input 埠, a modulation 埠, a controller, a phase changer and an active power decoupling circuit The operation method includes: the input 埠 receiving and transmitting the input power of the DC power source; and when a first pulse width modulation control signal and a second pulse width modulation control signal are both enabled, the modulation The stored power of the first inductor is output to the inverter, and the stored power of the second inductor of the active power decoupling circuit is stored to the active power solution through the third diode of the active power decoupling circuit The first capacitor of the coupling circuit and the power stored by the magnetizing inductor are stored to the first capacitor of the active power decoupling circuit 透过 through the first diode of the modulation 埠. The method of operation of claim 18, 19, 20 or 21, wherein the DC power source is a solar panel. The method of operation of claim 22, wherein the input port has a function of maximum power tracking.