TWI454031B - Three-port single-phase single-stage micro-inverter and operation method thereof - Google Patents

Description

Three-phase single-phase single-pole micro-converter and operation method thereof

The invention relates to a three-turn single-phase single-pole micro-converter and an operation method thereof, in particular to a three-turn single-phase single-pole micro-converter having the advantages of small volume, long life and high reliability, and the like Method of operation.

In general, the input port of the micro-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 micro-converter absorbs the energy of the solar panel, the modulation of the micro-converter outputs 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 micro-converter utilizes a high-capacity electrolytic capacitor to balance the input power of the solar panel and the 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-pole micro-converter. The three-phase single-phase single-pole micro-converter includes an input 埠, a modulation 埠, a phase changer and an active power Decoupling Circuit (APDC). 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 is coupled to the modulating 埠 for converting a sinusoidal current into an alternating current according to a switching control signal and an inverting switching control signal, and outputting the alternating current to a Mains, wherein the switch control signal and the reverse switch control signal have the same frequency as the mains; when the input power is greater than the output power output by the inverter, the modulation is adjusted according to a first pulse width Changing the control signal, outputting the full-wave rectified sine wave current to the inverter, and the active power decoupling circuit modulating the control signal according to a second pulse width, and storing the difference between the input power and the output power; When the input power is less than the output power, the modulation 调 modulates the control signal according to the first pulse width, outputs the sine wave current to the inverter, and the active power decoupling circuit 埠According to a third pulse width modulation control signal, an output port through the modulation of the phase difference to the transducer.

Another embodiment of the present invention provides a method for operating a three-turn single-phase single-pole micro-converter including an input 埠, a modulation 埠, a phase change phase converter, 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 Or a third pulse width modulation control signal to perform the corresponding action.

The invention provides a three-turn single-phase single-pole micro-converter and an operation method thereof. The three The single-phase single-pole micro-converter and the operation method use a modulation modulating signal according to a first pulse width modulation, and an active power decoupling circuit modulating the control signal according to a second pulse width or the third pulse The width modulation control signal performs the corresponding action. Thus, when an input power is greater than an output power, the three-phase single-phase single-pole micro-converter can store a difference between the input power and the output power; when the input power is less than the output power, the three-phase single-phase The monopolar micro-converter can release the difference between the input power and the output power to a mains. Compared with the prior art, this active power decoupling circuit can replace the high capacitance and bulk electrolytic capacitor. Therefore, the present invention has advantages of a small volume, a long life, and a high reliability.

Please refer to FIG. 1. FIG. 1 is a schematic diagram showing a three-turn single-phase single-pole micro-converter 100 according to an embodiment of the present invention. The three-phase single-phase monopole micro-converter 100 includes an input port 102, a modulation block 104, a phase changer 106, and an active power decoupling circuit (APDC) 108. The input port 102 is configured to be coupled to the DC power source 110 and receive and transmit the input power PDC of the DC power source 110. The DC power source is a solar panel, and the input port 102 has a maximum power point tracking (maximum power point tracking). ) function. However, the present invention is not limited to a DC power source which is a solar panel. The modulation 埠 104 is for magnetically coupling the input 埠 102 and generates and outputs a full-wave rectified sine wave current according to the input power PDC of the DC power supply 110. The inverter 106 is coupled to the modulation buffer 104 for controlling signals according to a switch control signal SCS and an inversion switch Converting the sinusoidal current into an alternating current IAC and outputting an 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 commercial AC; when the input power PDC of the DC power supply 110 is greater than the output power PAC output by the inverter 106, the modulation 埠 104 outputs a full-wave rectification according to a first pulse width modulation control signal FPWM. The sine wave current to the commutator 106, and the active power decoupling circuit 108 stores the difference between the input power PDC of the DC power source 110 and the output power PAC output by the inverter 106 according to a second pulse width modulation control signal SPWM. When the input power PDC of the DC power source 110 is less than the output power PAC output by the inverter 106, the modulation buffer 104 outputs the sine wave current to the inverter 106 according to the first pulse width modulation control signal FPWM, and the active power. The decoupling circuit 108 outputs the difference between the input power PDC of the DC power source 110 and the output power PAC output by the inverter 106 to the inverter 106 via the modulation 埠 104 according to a third pulse width modulation control signal TPWM.

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 supply 110, and a second end, wherein the second end of the DC power supply 110 is coupled to a ground GND; the magnetizing inductance 1024 has a first One end is coupled to the first end of the DC power source 110, and the second end is coupled to the second end of the first coil 1022. The first switch 1026 has a first end coupled to the first coil 1022. The second end is configured to receive a control signal CS and a third end coupled to the ground GND.

As shown in FIG. 1 , the modulation transistor 104 includes a second coil 1042 , a second switch 1044 , a first diode 1046 , a second diode 1048 , and a first inductor 1050 . 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 coupled to the first end of the second coil 1042, a second end for receiving the first pulse width modulation control signal FPWM, and a third end; the first diode 1046 has a first end coupled to the third end of the second switch 1044, and a second end; the second diode 1048 has a first end coupled to the ground end GND, and a second end, The second inductor is coupled to the second end of the first diode 1046. The first inductor 1050 has a first end coupled to the second end of the first diode 1046 and a second end.

As shown in FIG. 1 , the active power decoupling circuit 108 includes a third coil 1082 , a third switch 1084 , a third diode 1086 , a second inductor 1088 , a fourth diode 1090 , and a first A capacitor 1092, a fifth diode 1094 and a fourth switch 1096. The third coil 1082 has a first end, and a second end coupled to the second end of the first diode 1046. The third switch 1084 has a first end coupled to the first end of the third coil 1082. The second end is configured to receive the second pulse width modulation control signal SPWM, and a third end; the third diode 1086 has a first end coupled to the third end of the third switch 1084. And a second end; the second inductor 1088 has a first end coupled to the second end of the third diode 1086, and a second end coupled to the second end of the third coil 1082; The diode 1090 has a first end and a second end coupled to the second end of the third diode 1086. The first capacitor 1092 has a first end coupled to the second inductor 1088. And a second end coupled to the first end of the fourth diode 1090; the fifth diode 1094 has a first end coupled to the first end of the fourth diode 1090, and a first end The second end is coupled to the first end of the third coil 1082. The fourth switch 1096 has a first end coupled to the first end of the fifth diode 1094 and a second end for receiving the third end. pulse TPWM of the modulation control signal, and a third terminal coupled to the Ground GND.

As shown in FIG. 1 , the inverter 106 includes a second capacitor 1062 , a fifth switch 1064 , a sixth switch 1066 , a seventh switch 1068 , an eighth switch 1070 , and a third inductor 1072 . The second capacitor 1062 has a first end coupled to the second end of the first inductor 1050, and a second end coupled to the ground end GND. The fifth switch 1064 has a first end coupled to the second end. a first end of the capacitor 1062, a second end for receiving the switch control signal SCS, and a third end; the sixth switch 1066 has a first end coupled to the first end of the second capacitor 1062, a first Two ends for receiving the inverting switch control signal And a third end coupled to the second end of the mains AC; the seventh switch 1068 has a first end coupled to the third end of the fifth switch 1064, and a second end for receiving the inverting switch Control signal And a third end coupled to the ground GND; the eighth switch 1070 has a first end coupled to the third end of the sixth switch 1066, 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 1072 has a first end coupled to the third end of the fifth switch 1064, and a second end coupled to the first end of the mains AC. Because the switch control signal SCS and the inverting switch control signal The frequency is the same as the frequency of the mains AC, so when the mains AC is a positive half cycle, the fifth switch 1064 and the eighth switch 1070 are turned on, and the sixth switch 1066 and the seventh switch 1068 are turned off; when the commercial AC is one During the negative half cycle, the fifth switch 1064 and the eighth switch 1070 are turned off, and the sixth switch 1066 and the seventh switch 1068 are turned on. In addition, the third inductor 1072 can filter out the high frequency current component on the first inductor 1050.

In addition, as shown in FIG. 1, the three-turn single-phase single-pole micro-converter 100 further includes a voltage stabilizing capacitor 112. The voltage stabilizing capacitor 112 has a first end coupled to the first end of the DC power source 110 and a second end coupled to the second end of the DC power source 110. The Zener capacitor 112 is used to stabilize the DC power source 110. The supplied current voltage VDC.

As shown in FIG. 1, the sensing direction of the second coil 1042 and the sensing direction of the third coil 1082 are the same as the sensing direction of the first coil 1022. In addition, the input power PDC of the DC power source 110 is equal to the product of the DC voltage VDC and the DC current IDC provided by the DC power source 110, and the output power PAC output by the inverter 106 is equal to the AC current of the AC current IAC and the AC AC. The product of.

Please refer to FIG. 2 to FIG. 9 . FIG. 2 is a schematic diagram for explaining input power PDC, output power PAC, alternating current IAC and alternating voltage VAC, and FIGS. 3 to 6 are diagrams illustrating three-phase single-phase monopole micro A schematic diagram of converter 100 in state I, and FIGS. 7-9 are schematic diagrams illustrating state III of three-turn single-phase monopole micro-converter 100. As shown in FIG. 2, state I is that input power PDC is greater than output power PAC, and state II is that input power PDC is less than output power PAC. Basically, the three-phase single-phase single-pole micro-converter 100 can operate at a fixed switching frequency, and can operate in a current discontinuous conduction mode (DCM) and a continuous continuous current mode (CCM), wherein 3 to 9 are illustrated by the current discontinuous conduction mode.

In state I, the input power PDC can be divided into A zone power and C zone power, where The power in the C zone is equal to the output power PAC, and the power in the A zone is the difference between the input power PDC and the output power PAC. Therefore, the C-zone power is transmitted to the mains AC through the first switch 1026, the second switch 1044, the first diode 1046, the second diode 1048, the first inductor 1050, the second capacitor 1062, and the inverter 106. The power of the A region is stored to the first capacitor 1092 through the third switch 1084, the third diode 1086, and the second inductor 1088. In addition, in state I, the energy stored to the magnetizing inductance 1024 can be recovered to the first capacitor 1092 through the fifth diode 1094 to avoid saturation of the first coil 1022. In state I, since the input power PDC is greater than the output power PAC, the fourth switch 1096 is always off, that is, the active power decoupling circuit 108 is used to store the difference between the input power PDC and the output power PAC (A-zone power). .

In addition, the first pulse width modulation control signal FPWM, the second pulse width modulation control signal SPWM, and the third pulse width modulation control signal TPWM are high frequency modulation signals of the same frequency (for example, a 20 KHz modulation signal). In state I, the three-turn single-phase single-pole micro-converter 100 can be divided into three operation modes (mode I1, mode I2, and mode I3) in one switching cycle of the pulse width modulation control signal, respectively, as shown in FIG. As shown in Figure 6.

As shown in FIG. 2 and FIG. 3, in mode I1, the second switch 1044 and the third switch 1084 are simultaneously turned on (ON), wherein the turn-on time of the second switch 1044 is controlled by the output power PAC to control the first pulse width. The variable control signal FPWM is determined (that is, the duty cycle of the second switch 1044 is determined by the output power PAC), and the energy corresponding to the power of the C zone is stored to the first inductor 1050. In addition, in order to maintain DC The source 110 outputs the maximum power, and the turn-on time of the third switch 1084 of the active power decoupling circuit 108 is determined by the maximum power tracking control of the input port 102 to control the second pulse width modulation control signal SPWM (ie, the third switch 1084). The duty cycle is determined by the maximum power tracking of the input port 102) and the energy corresponding to the power of the zone A is stored to the second inductor 1088. In addition, the turn-on time of the first switch 1026 is determined by an OR operation of the second switch 1044 and the turn-on time of the third switch 1084, and when the first switch 1026 is turned on, the magnetizing inductance 1024 is also The portion of the input power PDC is stored.

Mode I2 can be divided into two seed modes (sub mode I2A and sub mode I2B). As shown in FIGS. 2 and 4, in the sub-mode I2A, when the switching period of the pulse width modulation signal is close to the zero crossing point of the AC voltage VAC, the output power PAC is low, so the second switch 1044 is turned off. And the third switch 1084 is turned on. At this time, the energy stored on the first inductor 1050 is output to the commercial AC through the inverter 106. Because the third switch 1084 is on, energy corresponding to the power of zone A continues to be stored to the second inductor 1088. Like mode I1, the turn-on time of first switch 1026 is determined by the turn-on time of second switch 1044 and the turn-on time or logic operation of third switch 1084.

As shown in FIGS. 2 and 5, in the sub-mode I2B, when the switching period of the pulse width modulation signal is close to the effective value of the AC voltage VAC (point E in FIG. 2), the output power PAC is high. Therefore, the second switch 1044 is turned on and the third switch 1084 is turned off. At this time, the energy stored on the second inductor 1088 is stored to the first capacitor 1092 through the fourth diode 1090. Same as mode I1, the opening time of the first switch 1026 is It is determined by the on time of the second switch 1044 and the on time of the third switch 1084 or a logical operation.

As shown in FIGS. 2 and 6, in mode I3, the second switch 1044 and the third switch 1084 are simultaneously turned off, and the first switch 1026 is also turned off. Because the second switch 1044 and the third switch 1084 are simultaneously turned off, the energy stored on the second inductor 1088 is stored to the first capacitor 1092 through the fourth diode 1090, and the energy stored in the first inductor 1050 is released to the commercial AC. . In addition, because the first switch 1026 is turned off, the energy stored by the magnetizing inductance 1024 can be stored to the first capacitor 1092 through the fifth diode 1094. Like mode I1, the turn-on time of first switch 1026 is determined by the turn-on time of second switch 1044 and the turn-on time or logic operation of third switch 1084.

In state II, the output power PAC can be divided into B-zone power and D-zone power, wherein the D-zone power is equal to the input power PDC, and the B-zone power is the difference between the output power PAC and the input power PDC. Therefore, in state II, the power of the D zone (ie, the maximum power of the DC power source 110) passes through the first switch 1026, the second switch 1044, the first diode 1046, the second diode 1048, and the first inductor 1050. The second capacitor 1062 and the phase changer 106 are transmitted to the mains AC, and the power of the B zone is the energy stored in the first capacitor 1092 from the state I, through the fourth switch 1096, the second diode 1048 and the first inductor 1050. provide. In state II, because the output power PAC is greater than the input power PDC, the third switch 1084 is always off and the second switch 1044 is always on, that is, in state II, the active power decoupling circuit 108 is used to release the state. The difference between the input power PDC and the output power PAC stored in I (A-zone power). In addition, in the shape In state II, the energy stored in the magnetizing inductance 1024 can also be recovered to the first capacitor 1092 through the fifth diode 1094. In state II, the three-turn single-phase monopole micro-converter 100 can also be divided into three operation modes (mode II1, mode II2, and mode II3) in one switching cycle of the pulse width modulation control signal, respectively, as in the seventh Figure to Figure 9.

As shown in FIGS. 2 and 7, in mode II1, the first switch 1026 is turned on, and the turn-on time of the first switch 1026 is determined by the maximum power tracking of the input port 102. Because the first switch 1026 is turned on, energy corresponding to the input power PDC is stored to the first inductor 1050.

As shown in FIG. 2 and FIG. 8, in mode II2, after the first switch 1026 is turned off, since the inverter 106 also needs to output the output power PAC (that is, the power in the B zone) to the commercial AC, the power in the B zone is The energy stored by the first capacitor 1092 in state I is provided through the fourth switch 1096 and stores the B-zone power to the first inductor 1050. The energy stored by the magnetizing inductance 1024 is stored to the first capacitor 1092 through the fifth diode 1094. The turn-on time of the fourth switch 1096 is determined by controlling the third pulse width modulation control signal TPWM by the difference between the input power PDC and the output power PAC (ie, the power of the B zone).

As shown in FIGS. 2 and 9, in mode II3, when both the first switch 1026 and the fourth switch 1096 are turned off, the energy stored by the first inductor 1050 is output to the inverter 106, and the magnetizing inductance 1024. The stored energy is stored through the fifth diode 1094 to the first capacitor 1092.

1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , and 10 , Another embodiment illustrates a flow chart of a method of operation of a three-turn single phase single pole micro-converter. The method of FIG. 10 is illustrated by the three-turn single-phase single-pole micro-converter 100 of FIG. 1. The detailed steps are as follows: Step 1000: Start; Step 1002: Input 埠102 receives and transmits the input power PDC of the DC power source 110; 1004: whether the input power PDC is greater than the output power PAC output by the inverter 106; if yes, proceed to step 1006; if not, proceed to step 1016; step 1006: the energy input from the input port 102 is stored to the modulation buffer 104 and Active power decoupling circuit 108; Step 1008: Whether the switching period of the pulse width modulation signal is close to the zero crossing point of the AC voltage VAC; if yes, proceed to step 1010; if not, proceed to step 1012; Step 1010: Modulation 104 The stored energy is output to the inverter 106, and the energy input from the input port 102 is stored to the active power decoupling circuit 108, and the process proceeds to step 1014; step 1012: the energy input from the input port 102 is stored to the modulation埠104, proceed to step 1014; Step 1014: The energy stored in the modulation buffer 104 is output to the inverter 106, and the energy stored in the excitation inductance 1024 of the input port 102 is stored in the active power decoupling circuit 108, and the process returns to step 1004; Step 1016: Slave input The energy input by the 埠 102 is stored to the modulation 埠 104; Step 1018: The energy stored by the active power decoupling circuit 108 is output to the inverter 106 and stored to the modulation 埠 104; Step 1020: Modulation 埠 104 The stored energy is output to the inverter 106, and the energy stored by the magnetizing inductance 1024 of the input port 102 is stored to the active power decoupling circuit 108, and the process returns to step 1004.

In step 1002, the input port 102 is used to receive and transmit the input power PDC of the DC power source 110, wherein the DC power source is a solar panel, and the input port 102 has the function of maximum power tracking. In step 1006 (mode I1), as shown in FIGS. 2 and 3, when the first pulse width modulation control signal FPWM and the second pulse width modulation control signal SPWM are enabled (ie, the second switch 1044 and When the third switch 1084 is simultaneously turned on, the energy input from the input port 102 (ie, the input power PDC) is stored to the modulation buffer 104 and the active power decoupling circuit 108, wherein the first pulse width modulation control signal FPWM is generated. The energy time is determined by the output power PAC. Therefore, the modulation 埠 104 can output a full-wave rectified sine wave current to the commutator 106 according to the first pulse width modulation control signal FPWM, and the active power decoupling circuit 108 modulates the control signal SPWM according to the second pulse width. The difference between the input power PDC and the output power PAC (A-zone power) is stored. In addition, in order to maintain the maximum power output of the DC power source 110, the enable time of the second pulse width modulation control signal SPWM is the maximum power of the input port 102. Tracking is determined. In addition, the turn-on time of the first switch 1026 is determined by performing an OR logic operation by the turn-on time of the second switch 1044 and the turn-on time of the third switch 1084, and when the first switch 1026 is turned on, the magnetizing inductance 1024 also stores the input. Part of the power PDC. In step 1010 (sub-mode I2A), as shown in FIGS. 2 and 4, when the switching period of the pulse width modulation signals (FPWM, SPWM, and TPWM) is close to the zero crossing point of the alternating voltage VAC, the output is The power PAC is low, so the first pulse width modulation control signal FPWM is disabled and the second pulse width modulation control signal SPWM is enabled (ie, the second switch 1044 is turned off and the third switch 1084 is turned on). At this time, the energy stored in the modulation buffer 104 (the energy stored on the first inductor 1050) is output to the inverter 106 through the full-wave rectified sine wave current; since the third switch 1084 is turned on, it is input from the input port 102. The energy continues to be stored to the second inductor 1088 within the active power decoupling circuit 108. In addition, as with mode I1, the turn-on time of the first switch 1026 is determined by the turn-on time of the second switch 1044 and the turn-on time or logic operation of the third switch 1084. In step 1012 (sub-mode I2B), as shown in FIGS. 2 and 5, when the switching period of the pulse width modulation signal is close to the effective value of the AC voltage VAC (point E in FIG. 2), the output power The PAC is higher, so the first pulse width modulation control signal FPWM enable and the second pulse width modulation control signal SPWM are disabled (ie, the second switch 1044 is on and the third switch 1084 is off). At this time, the energy stored on the second inductor 1088 is stored to the first capacitor 1092 through the fourth diode 1090, and the energy input from the input port 102 (ie, the input power PDC) is stored into the modulation buffer 104. The first inductor 1050. Like mode I1, the turn-on time of first switch 1026 is determined by the turn-on time of second switch 1044 and the turn-on time or logic operation of third switch 1084. In step 1014 (sub-mode I3), as shown in FIGS. 2 and 6, When the first pulse width modulation control signal FPWM and the second pulse width modulation control signal SPWM are disabled (that is, both the second switch 1044 and the third switch 1084 are turned off), and the first switch 1026 is also turned off, because the second The switch 1044 and the third switch 1084 are simultaneously turned off, so the energy stored by the modulation 埠 104 (the first inductor 1050) is released to the inverter 106, and the energy stored on the second inductor 1088 is stored by the fourth diode 1090. To the first capacitor 1092. Additionally, because the first switch 1026 is off, the energy stored by the magnetizing inductance 1024 can be stored by the fifth diode 1094 to the active power decoupling circuit 108 (first capacitor 1092). Like mode I1, the turn-on time of first switch 1026 is determined by the turn-on time of second switch 1044 and the turn-on time or logic operation of third switch 1084. In step 1016 (sub-mode II1), as shown in FIGS. 2 and 7, the input 埠102 enable and the third pulse width modulation control signal TPWM are disabled (ie, the first switch 1026 is turned on and the fourth When switch 1096 is off, the energy corresponding to input power PDC is stored to first inductance 1050 within modulation 埠 104, wherein the on time of first switch 1026 is determined by the maximum power tracking of input 埠 102. In step 1018 (sub-mode II2), as shown in FIGS. 2 and 8, the input 埠 102 de-energize and the third pulse width modulation control signal TPWM are enabled (ie, the first switch 1026 is turned off and the fourth After the switch 1096 is turned on, since the inverter 106 also needs to output the output power PAC (ie, the power in the B zone) to the mains AC, the power in the B zone will be stored in the state I by the first capacitor 1092 in the active power decoupling circuit 108. The energy is supplied through the fourth switch 1096, and stores the power of the B region to the first inductor 1050 in the modulation buffer 104. The turn-on time of the fourth switch 1096 is the difference between the input power PDC and the output power PAC (ie, The power of the B zone is controlled by the third pulse width modulation control signal TPWM. In step 1018 (sub-mode II3), as shown in FIGS. 2 and 9, when input 埠102 and When the third pulse width modulation control signal TPWM is de-energized (that is, both the first switch 1026 and the fourth switch 1096 are turned off), the energy stored in the first inductor 1050 in the modulation buffer 104 is output to the inverter 106. And the energy stored by the magnetizing inductance 1024 is stored through the fifth diode 1094 to the first capacitor 1092 in the active power decoupling circuit 108.

In summary, the three-phase single-phase single-pole micro-converter provided by the present invention and the operation method thereof are modulated by the modulation pulse according to the first pulse width, and the active power decoupling circuit is adjusted according to the second pulse width. The variable control signal or the third pulse width modulation control signal performs the corresponding action. Thus, when the input power is greater than the output power, the three-phase single-phase single-pole micro-converter can store the difference between the input power and the output power; when the input power is less than the output power, the three-phase single-phase single-pole micro-converter can release the input. The difference between power and output power to the mains. Therefore, the present invention has advantages such as a smaller volume, a longer life, and a higher reliability than the prior art.

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-Pole Micro-Converter

102‧‧‧ Input埠

104‧‧‧调调

106‧‧‧Commutator

108‧‧‧Active power decoupling circuit

110‧‧‧DC power supply

112‧‧‧Steady capacitor

1022‧‧‧First coil

1024‧‧‧Magnetic inductance

1026‧‧‧First switch

1042‧‧‧second coil

1044‧‧‧Second switch

1046‧‧‧First Diode

1048‧‧‧second diode

1050‧‧‧first inductance

1062‧‧‧second capacitor

1064‧‧‧ fifth switch

1066‧‧‧ sixth switch

1068‧‧‧ seventh switch

1070‧‧‧ eighth switch

1072‧‧‧ Third inductance

1082‧‧‧third coil

1084‧‧‧third switch

1086‧‧‧ Third Dipole

1088‧‧‧second inductance

1090‧‧‧Fourth dipole

1092‧‧‧first capacitor

1094‧‧‧ fifth diode

1096‧‧‧fourth switch

AC‧‧‧Power

A, B, C, D‧‧‧ power

CS‧‧‧Control signal

E‧‧‧ points

FPWM‧‧‧First pulse width modulation control signal

GND‧‧‧ ground

IAC‧‧‧AC current

IDC‧‧‧ DC current

PAC‧‧‧ output power

PDC‧‧‧ input power

SCS‧‧‧ switch control signal

SPWM‧‧‧Second pulse width modulation control signal

‧‧‧Inverted switch control signal

TPWM‧‧‧3rd pulse width modulation control signal

VDC‧‧‧ DC voltage

VAC‧‧‧AC voltage

1000-1020‧‧ steps

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

Figure 2 is a schematic diagram for explaining input power, output power, alternating current, and alternating current voltage.

Figures 3 through 6 are schematic diagrams illustrating the state of the three-turn single-phase monopole micro-converter in state I.

Figures 7 through 9 are schematic diagrams illustrating the state of the three-turn single-phase monopole micro-converter in state II.

Figure 10 is a flow chart showing a method of operating a three-turn single-phase single-pole micro-converter according to another embodiment of the present invention.

100‧‧‧Three-Phase Single-Phase Single-Pole Micro-Converter

102‧‧‧ Input埠

104‧‧‧调调

106‧‧‧Commutator

108‧‧‧Active power decoupling circuit

110‧‧‧DC power supply

112‧‧‧Steady capacitor

1022‧‧‧First coil

1024‧‧‧Magnetic inductance

1026‧‧‧First switch

1042‧‧‧second coil

1044‧‧‧Second switch

1046‧‧‧First Diode

1048‧‧‧second diode

1050‧‧‧first inductance

1062‧‧‧second capacitor

1064‧‧‧ fifth switch

1066‧‧‧ sixth switch

1068‧‧‧ seventh switch

1070‧‧‧ eighth switch

1072‧‧‧ Third inductance

1082‧‧‧third coil

1084‧‧‧third switch

1086‧‧‧ Third Dipole

1088‧‧‧second inductance

1090‧‧‧Fourth dipole

1092‧‧‧first capacitor

1094‧‧‧ fifth diode

1096‧‧‧fourth switch

AC‧‧‧Power

CS‧‧‧Control signal

FPWM‧‧‧First pulse width modulation control signal

GMD‧‧‧Location

IAC‧‧‧AC current

IDC‧‧‧ DC current

SCS‧‧‧ switch control signal

SPWM‧‧‧Second pulse width modulation control signal

‧‧‧Inverted switch control signal

TPWM‧‧‧3rd pulse width modulation control signal

VDC‧‧‧ DC voltage

VAC‧‧‧AC voltage

Claims (25)

A three-phase single-phase single-pole micro-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, 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 coupled to the first end of the second coil, and a second end for receiving the first pulse width modulation control signal and a third end; The pole body has a first end coupled to the third end of the second switch, and a second end; a second diode having a first end coupled to the ground end, and a first end The second end is coupled to the second end of the first diode; and a first inductor has a first end coupled to the second end of the first diode, and a second end; a phase changer coupled to the modulation 埠 for converting a sine wave current into a cross according to a switch control signal and an inverting switch control signal Current, and outputting the alternating current to a mains, wherein the switch control signal and the frequency of the reverse switch control signal are the same as the frequency of the mains; and an active power decoupling circuit (APDC), wherein When the input power is greater than the output power output by the inverter Transmitting, according to a first pulse width modulation control signal, outputting the full-wave rectified sine wave current to the inverter, and the active power decoupling circuit modulating the control signal according to a second pulse width. Storing the difference between the input power and the output power; when the input power is less than the output power, the modulation 调 modulates the control signal according to the first pulse width, outputs the sine wave current to the inverter, and the The active power decoupling circuit outputs a difference to the inverter according to a third pulse width modulation control signal, wherein the active power decoupling circuit comprises: a third coil having a first end And a second end coupled to the second end of the first diode; a third switch having a first end coupled to the first end of the third coil and a second end Receiving the second pulse width modulation control signal, and a third terminal; a third diode having a first end coupled to the third end of the third switch, and a second end; a second inductor having a first end coupled to the third diode a second end, and a second end coupled to the second end of the third coil; a fourth diode having a first end and a second end coupled to the third diode a second end; a first capacitor having a first end coupled to the second end of the second inductor, and a second end coupled to the first end of the fourth diode; The fifth diode has a first end coupled to the first end of the fourth diode, and a second end coupled to the first end of the third coil; a fourth switch having a first end coupled to the first end of the fifth diode, a second end for receiving the third pulse width modulation control signal, and a third end coupled Connected to the ground. The three-phase single-phase monopolar micro-converter of claim 1, wherein the direct current power source is a solar panel. A three-phase single-phase single-pole micro-converter as claimed in claim 2, wherein the input port has a function of maximum power point tracking. The three-phase single-phase single-pole micro-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 end. The three-phase single-phase single-pole micro-converter according to claim 1, wherein the inverter includes: a second capacitor having a first end coupled to the second end of the first inductor, and a first The second end is coupled to the ground end; a fifth switch has a first end coupled to the first end of the second capacitor, The second end is configured to receive the switch control signal, and a third end; a sixth switch having a first end coupled to the first end of the second capacitor and a second end for receiving the An inverting switch control signal, and a third end coupled to the second end of the mains; a seventh switch having a first end coupled to the third end of the fifth switch, a second end, The third switch is coupled to the ground end; the eighth switch has a first end coupled to the third end of the sixth switch, and a second end And a third end coupled to the ground end; and a third inductor having a first end coupled to the third end of the fifth switch, and a second The end is coupled to the first end of the utility. The three-phase single-phase single-pole micro-converter according to claim 5, further comprising: a voltage-stabilizing capacitor having a first end coupled to the first end of the DC power source and a second end coupled The second end of the DC power source, wherein the voltage stabilizing capacitor is used to stabilize the DC voltage provided by the DC power source. The three-phase single-phase single-pole micro-converter according to claim 6, wherein the sensing direction of the second coil and the sensing direction of the third coil are the same as the sensing direction of the first coil. The three-phase single-phase single-pole micro-converter according to claim 6, wherein the input power is It is equal to the product of the DC voltage and the DC current provided by the DC power source. A three-phase single-phase single-pole micro-converter as claimed in claim 6, 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-pole micro-converter according to claim 6, wherein when the input power is greater than the output power output by the inverter, the fourth switch is turned off, and the opening time of the second switch is The output power is controlled by the first pulse width modulation control signal, and the opening time of the third switch is determined by the maximum power tracking control of the second pulse width modulation control signal. The three-phase single-phase single-pole micro-converter according to claim 10, wherein when the second switch and the third switch are turned on, energy input from the input port is stored to the first inductor and the second inductor . The three-phase single-phase single-pole micro-converter according to claim 10, wherein when the second switch is turned off and the third switch is turned on, energy stored in the first inductor is output to the inverter, and The input 埠 input energy is stored to the second inductance. The three-phase single-phase single-pole micro-converter according to claim 10, wherein when the second switch is turned on and the third switch is turned off, energy stored in the second inductor is stored to the fourth diode A first capacitor, and energy input from the input port, are stored to the first inductor. The three-phase single-phase single-pole micro-converter according to claim 10, wherein when the second switch and the third switch are both closed, the energy stored by the first inductor is output to the inverter, the first The energy stored in the second inductor is stored to the first capacitor through the fourth diode, and the energy stored in the magnetizing inductor is stored to the first capacitor through the fifth diode. The three-phase single-phase single-pole micro-converter according to claim 11, wherein the opening time of the first switch is performed by an opening time of the second switch and an opening time of the third switch. Or logical operation. The three-phase single-phase single-pole micro-converter according to claim 6, wherein when the input power is less than the output power output by the inverter, the third switch is turned off, the second switch is turned on, and the first switch is The turn-on time is determined by the maximum power tracking, and the fourth switch turn-on time is determined by controlling the third pulse width modulation control signal by the difference between the input power and the output power. The three-turn single-phase single-pole micro-converter of claim 16, wherein when the first switch is turned on and the fourth switch is turned off, energy input from the input port is stored to the first inductor. The three-phase single-phase single-pole micro-converter according to claim 16, wherein when the first switch is turned off and the fourth switch is turned on, energy stored in the first capacitor passes through the fourth A switch is output to the inverter and stored to the first inductor. The three-phase single-phase single-pole micro-converter according to claim 16, wherein when the first switch and the fourth switch are both closed, the energy stored by the first inductor is output to the inverter, and the The energy stored by the magnetizing inductance is stored to the first capacitor through the fifth diode. A method for operating a three-turn single-phase single-pole micro-converter includes an input 埠, a modulation 埠, a phase changer, and an active power decoupling circuit, the operation method includes The input 埠 receives and transmits the input power of the DC power supply; when the input power is greater than the output power output by the inverter, and a first pulse width modulation control signal and a second pulse width modulation control signal When energy is enabled, the energy input from the input port is stored to the modulation transformer and the active power decoupling circuit; when the input power is greater than the output power output by the inverter, and the first pulse width modulation control signal And the second pulse width modulation control signal is de-energized, the energy stored in the modulation buffer is output to the inverter, and the energy stored in the excitation inductance of the input port is stored in the active power decoupling circuit; And when the input power is greater than the output power output by the inverter, and the first pulse width modulation control signal is enabled and the second pulse width modulation control signal is enabled, the modulation is stored Energy is output to the commutator, and The energy input from the input port is stored to the active power decoupling circuit. The operation method of claim 20, wherein when the input power is greater than the output power output by the inverter, the enable time of the first pulse width modulation control signal is determined by the output power, and The enable time of the second pulse width modulation control signal is determined by the maximum power tracking of the input port. A method for operating a three-turn single-phase single-pole micro-converter includes an input 埠, a modulation 埠, a phase changer, and an active power decoupling circuit, the operation method includes The input 埠 receives and transmits the input power of the DC power supply; when the input power is greater than the output power output by the inverter, and a first pulse width modulation control signal and a second pulse width modulation control signal When energy is enabled, the energy input from the input port is stored to the modulation transformer and the active power decoupling circuit; when the input power is greater than the output power output by the inverter, and the first pulse width modulation control signal And the second pulse width modulation control signal is de-energized, the energy stored in the modulation buffer is output to the inverter, and the energy stored in the excitation inductance of the input port is stored in the active power decoupling circuit; And when the input power is greater than the output power output by the inverter, and the first pulse width modulation control signal enable and the second pulse width modulation control signal are deactivated, The energy is stored to the modulation port. The operation method of claim 20, 21 or 22, wherein the enable time of the input port is an enable time of the first pulse width modulation control signal and an enable of the second pulse width modulation control signal The time is executed by one or logical operation. A method for operating a three-turn single-phase single-pole micro-converter includes an input 埠, a modulation 埠, a phase changer, and an active power decoupling circuit, the operation method includes The input 埠 receives and transmits the input power of the DC power supply; when the input power is less than the output power output by the inverter, and the input 埠 enable and a third pulse width modulation control signal are deactivated, The input 埠 input energy is stored to the modulation 埠; when the input power is less than the output power output by the inverter, and the input snagging energy and the third pulse width modulation control signal are enabled, The energy stored by the active power decoupling circuit is output to the inverter and stored to the modulation 埠; and when the input power is less than the output power output by the inverter, and the input 埠 and the third When the pulse width modulation control signal is de-energized, the energy stored in the modulation buffer is output to the inverter, and the energy stored in the excitation inductance of the input port is stored in the active power decoupling circuit. The operation method of claim 24, wherein when the input power is less than the output power output by the inverter, the modulation is controlled according to a first pulse width modulation The signal enable, the enable time of the input port is determined by the maximum power tracking of the input port, and the enable time of the third pulse width modulation control signal is output by the input power and the inverter The difference in output power is determined.