Power converter

Abstract

A power converter includes a converter module and a control module. The converter module has a first arm and a second arm. The converter module receives a first AC voltage, a plurality of first control signals and a plurality of second control signals. The first arm and the second arm convert a first AC voltage into a first DC voltage and a second DC voltage according to the first control signal and the second control signal. The control module generates a first control signal to the first arm and generates a second control signal to the second arm according to the first AC voltage and a preset voltage. In each of the plurality of driving periods, a frequency of the first control signal is different from a frequency of the second control signal. In at least two of the driving periods, the frequencies of the first control signals are different.

Description

Technical Field

[0001] The present invention relates to a converter, and particularly to a power converter that can reduce switching power consumption and temperature. Background Art

[0002] Generally, when a traditional power converter performs a switching operation, the power converter uses a high-frequency switching signal to switch the switch. This will cause the switching power consumption and temperature of the switch in the power converter to be too high, which will further cause the components to age easily and the module power operation to be limited. Therefore, how to effectively solve the problem of too high switching power consumption and temperature of the switch in the power converter is an important issue at present. Summary of the Invention

[0003] The present invention provides a power converter, thereby effectively reducing switching power consumption and temperature to avoid easy aging of components and limitation of module power.

[0004] The present invention provides a power converter, including an inverter module and a control module. The inverter module has a first arm and a second arm. The inverter module receives a first AC voltage, a plurality of first control signals, and a plurality of second control signals. The first arm and the second arm convert the first AC voltage into a first DC voltage and a second DC voltage according to the first control signals and the second control signals. The control module is electrically connected to the first arm and the second arm. The control module receives the first AC voltage and a preset voltage, and generates a first control signal to the first arm and generates a second control signal to the second arm according to the first AC voltage and the preset voltage. In each of a plurality of driving periods, the frequency of the first control signal is different from the frequency of the second control signal. In at least two of the driving periods, the frequencies of the first control signals are different.

[0005] The present invention provides a power converter, which includes an inverter module, an inductor module, and a control module. The inverter module has a first upper switch module, a first lower switch module, a second upper switch module, a second lower switch module, a first diode, a second diode, a third diode, and a fourth diode. The first diode is electrically connected to the first upper switch module. The second diode is electrically connected to the first diode and the first lower switch module. The third diode is electrically connected to the first diode and the second upper switch module. The fourth diode is electrically connected to the third diode and the second lower switch module. The inverter module receives a first AC voltage, a plurality of first control signals, and a plurality of second control signals, and the first upper switch module, the first lower switch module, the second upper switch module, and the second lower switch module convert the first AC voltage into a first DC voltage and a second DC voltage according to the first control signals and the second control signals. The inductor module is electrically connected to the first upper switch module, the first lower switch module, the second upper switch module, and the second lower switch module. The inductor module receives a second AC voltage to generate the first AC voltage. The control module is electrically connected to the first upper switch module, the first lower switch module, the second upper switch module, and the second lower switch module. The control module receives the first AC voltage and a preset voltage, and generates a first control signal to the first upper switch module and the first lower switch module and generates a second control signal to the second upper switch module and the second lower switch module according to the first AC voltage and the preset voltage. During at least two of a plurality of driving periods, the frequencies of the first control signals are different.

[0006] In the power converter disclosed by the present invention, the control module generates a first control signal to the first arm (or the first upper switch module and the first lower switch module) of the inverter module and generates a second control signal to the second arm (or the second upper switch module and the second lower switch module) of the inverter module according to the first AC voltage and the preset voltage, wherein during each of a plurality of driving periods, the frequency of the first control signal is different from the frequency of the second control signal, and during at least two of the driving periods, the frequencies of the first control signals are different. In this way, the switching power consumption and temperature of the switching elements in the first arm (or the first upper switch module and the first lower switch module) and the second arm (or the second upper switch module and the second lower switch module) of the power converter can be effectively reduced, so as to avoid easy aging of the elements and limitation of the module power. Description of the Drawings

[0007] Figure 1 It is a schematic diagram of a power converter according to an embodiment of the present invention.

[0008] Figure 2 It is a waveform diagram of a first AC signal, a second AC signal, a first control signal, and a second control signal according to an embodiment of the present invention.

[0009] Figure 3 For Figure 1Schematic diagram of the converter module.

[0010] Figure 4 For Figure 1 Schematic diagram of the control module.

[0011] Figure 5 Schematic diagram of a power converter according to another embodiment of the present invention.

[0012] Description of reference numerals:

[0013] 100, 500: Power converter

[0014] 110, 510: Converter module

[0015] 111: First arm

[0016] 112: Second arm

[0017] 120, 530: Control module

[0018] 310, 520: Inductor module

[0019] 410: First comparator

[0020] 420: Second comparator

[0021] 430: First control signal generator

[0022] 440: Second control signal generator

[0023] 450: Third control signal generator

[0024] 511: First upper switch module

[0025] 512: First lower switch module

[0026] 513: Second upper switch module

[0027] 514: Second lower switch module

[0028] CO1: First voltage stabilizing capacitor

[0029] CO2: Second voltage stabilizing capacitor

[0030] C1: First capacitor

[0031] C2: Second capacitor

[0032] C3: Third capacitor

[0033] C4: Fourth capacitor

[0034] C5: Fifth capacitor

[0035] C6: Sixth capacitor

[0036] C7: The seventh capacitor

[0037] C8: The eighth capacitor

[0038] D1: The first diode

[0039] D2: The second diode

[0040] D3: The third diode

[0041] D4: The fourth diode

[0042] DF1: The first flywheel diode

[0043] DF2: The second flywheel diode

[0044] DF3: The third flywheel diode

[0045] DF4: The fourth flywheel diode

[0046] DF5: The fifth flywheel diode

[0047] DF6: The sixth flywheel diode

[0048] DF7: The seventh flywheel diode

[0049] DF8: The eighth flywheel diode

[0050] T1: The first transistor

[0051] T2: The second transistor

[0052] T3: The third transistor

[0053] T4: The fourth transistor

[0054] T5: The fifth transistor

[0055] T6: The sixth transistor

[0056] T7: The seventh transistor

[0057] T8: The eighth transistor

[0058] SW1: The first switch unit

[0059] SW2: The second switch unit

[0060] SW3: The third switch unit

[0061] SW4: The fourth switch unit

[0062] SW5: The fifth switch unit

[0063] SW6: The sixth switch unit

[0064] SW7: The seventh switch unit

[0065] SW8: The eighth switch unit

[0066] Vab: The first AC voltage

[0067] Vgrid: The second AC voltage

[0068] VP: The preset voltage

[0069] VO1: The first DC voltage

[0070] VO2: The second DC voltage

[0071] N1: The first DC voltage node

[0072] N2: The second DC voltage node

[0073] N3: The third DC voltage node

[0074] CA1: The first comparison signal

[0075] CA2: The second comparison signal

[0076] CS11~CS14: The first control signal

[0077] CS21~CS24: The second control signal

[0078] CS3: The third control signal

[0079] CS4: The fourth control signal

[0080] T1, T2: The driving periods Detailed implementation manners

[0081] The technical terms in this specification refer to the customary terms in this technical field. If this specification explains or defines some terms, the explanations of these terms shall prevail according to the explanations or definitions in this specification. Each embodiment of the present disclosure has one or more technical features. On the premise of possible implementation, those skilled in the art can selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

[0082] In the following listed embodiments, the same reference numerals will represent the same or similar elements or components.

[0083] Figure 1 It is a schematic diagram of a power converter according to an embodiment of the present invention. Please refer to Figure 1 , the power converter 100 includes an inverter module 110 and a control module 120.

[0084] The converter module 110 may include a first arm 111 and a second arm 112. The converter module 110 may receive a first AC voltage Vab, a plurality of first control signals CS11 to CS14, and a plurality of second control signals CS21 to CS24. Additionally, the first arm 111 and the second arm 112 of the converter module 110 may convert the first AC voltage Vab into a first DC voltage VO1 and a second DC voltage VO2 according to the first control signals CS11 to CS14 and the second control signals CS21 to CS24. In this embodiment, the first arm 111 may perform a switching operation according to the first control signals CS11 to CS14, and the second arm 112 may perform a switching operation according to the second control signals CS21 to CS24, such that the converter module 110 converts the first voltage Vab into the first DC voltage VO1 and the second DC voltage VO2.

[0085] The control module 120 may be electrically connected to the first arm 111 and the second arm 112. The control module 120 may receive the first AC voltage Vab and a preset voltage VP, and generate the first control signals CS11 to CS14 to the first arm 111 and generate the second control signals CS21 to CS24 to the second arm 112 according to the first AC voltage Vab and the preset voltage VP. In this embodiment, the above-mentioned preset voltage VP is, for example, a zero voltage (0V). Further, the preset voltage VP is specifically the zero-crossing voltage of the first AC voltage Vab, so it is usually a voltage preset inside the power converter 100, or may also be a signal provided externally, but the embodiments of the present invention are not limited thereto.

[0086] In this embodiment, in each of the plurality of driving periods, the frequencies of the first control signals CS11 to CS14 are different from the frequencies of the second control signals CS21 to CS24. Taking the number of two driving periods as an example, for example, driving periods T1 to T2, as Figure 2 shown. In driving period T1, when the frequencies of the first control signals CS11 to CS14 are high frequencies, the frequencies of the second control signals CS21 to CS24 are low frequencies. In driving period T2, when the frequencies of the first control signals CS11 to CS14 are low frequencies, the frequencies of the second control signals CS21 to CS24 are high frequencies. In other embodiments, in driving period T1, when the frequencies of the first control signals CS11 to CS14 are low frequencies, the frequencies of the second control signals CS21 to CS24 are high frequencies. In driving period T2, when the frequencies of the first control signals CS11 to CS14 are high frequencies, the frequencies of the second control signals CS21 to CS24 are low frequencies. Additionally, each of the above-mentioned driving periods is, for example, one period of the first AC voltage Vab (or the second AC voltage Vgrid), and specifically includes the time lengths of the positive half-cycle voltage and the negative half-cycle voltage of one first AC voltage Vab.

[0087] In addition, taking the number of 10 driving periods as an example, for example, driving periods T1 to T10. In some embodiments, during driving period T1, when the frequencies of the first control signals CS11 to CS14 are high frequencies, the frequencies of the second control signals CS21 to CS24 are low frequencies. In some embodiments, during driving period T1, when the frequencies of the first control signals CS11 to CS14 are low frequencies, the frequencies of the second control signals CS21 to CS24 are high frequencies. The same applies to the remaining driving periods T2 to T10.

[0088] In addition, among at least two of the above driving periods, the frequencies of the first control signals CS11 to CS14 are different. Taking the number of 2 driving periods as an example, for example, driving periods T1 to T2, as Figure 2 shown. During driving period T1, the frequencies of the first control signals CS11 to CS14 are high frequencies, and during driving period T2, the first control signals CS11 to CS14 are low frequencies.

[0089] In addition, taking the number of 10 driving periods as an example, for example, driving periods T1 to T10. In some embodiments, during driving period T1, the frequencies of the first control signals CS11 to CS14 are high frequencies, and during driving periods T2 to T10, the first control signals CS11 to CS14 are low frequencies. In some embodiments, during driving periods T1 and T6, the frequencies of the first control signals CS11 to CS14 are high frequencies, and during driving periods T2 to T5 and T7 to T10, the first control signals CS11 to CS14 are low frequencies.

[0090] In some embodiments, during driving periods T1 to T2, the frequencies of the first control signals CS11 to CS14 are high frequencies, and during driving periods T3 to T10, the first control signals CS11 to CS14 are low frequencies. In some embodiments, during driving periods T1, T3, T5, T7, and T9, the frequencies of the first control signals CS11 to CS14 are high frequencies, and during driving periods T2, T4, T6, T8, and T10, the first control signals CS11 to CS14 are low frequencies. The same applies to the rest.

[0091] As can be seen from the above, through the control of the above control module 120, the frequencies of the first control signals CS11 to CS14 or the second control signals CS21 to CS24 will not always be high frequencies. Therefore, the switching operations of the converter module 110 will not be concentrated on the same arm (i.e., the first arm 111 or the second arm 112) for high-frequency switching, and there will be no situation where the switching power consumption and temperature of a certain arm are too high. In this way, the switching power consumption and temperature of the first arm 111 and the second arm 112 can be effectively reduced to avoid easy aging of components and limitation of module power.

[0092] Furthermore, the period during which the frequencies of the first control signals CS11 to CS14 and the second control signals CS21 to CS24 switch between high frequency and low frequency can be symmetric. For example, taking the number of 10 driving periods as an example, such as driving periods T1 to T10. In some embodiments, during driving periods T1, T3, T5, T7, T9, the frequencies of the first control signals CS11 to CS14 are high frequency, and the frequencies of the second control signals CS21 to CS24 are low frequency. During driving periods T2, T4, T6, T8, T10, the frequencies of the first control signals CS11 to CS14 are low frequency, and the frequencies of the second control signals CS21 to CS24 are high frequency.

[0093] In some embodiments, during driving periods T1 to T2, T5 to T6, T9 to T10, the frequencies of the first control signals CS11 to CS14 are high frequency, and the frequencies of the second control signals CS21 to CS24 are low frequency. During driving periods T3 to T4, T7 to T8, the frequencies of the first control signals CS11 to CS14 are low frequency, and the frequencies of the second control signals CS21 to CS24 are high frequency. In some embodiments, during driving periods T1 to T5, the frequencies of the first control signals CS11 to CS14 are high frequency, and the frequencies of the second control signals CS21 to CS24 are low frequency. During driving periods T6 to T10, the frequencies of the first control signals CS11 to CS14 are low frequency, and the frequencies of the second control signals CS21 to CS24 are high frequency. And so on.

[0094] That is to say, the periods during which the first control signals CS11 to CS14 and the second control signals CS21 to CS24 maintain high-frequency or low-frequency operation can be multiples of the period of the first AC voltage Vab (or the second AC voltage Vgrid), specifically multiples of the positive half-cycle voltage and the negative half-cycle voltage period of a first AC voltage Vab (or the second AC voltage Vgrid) (including 1 to N times, N is a natural number). That is, the first control signals CS11 to CS14 and the second control signals CS21 to CS24 perform a frequency switch once per first AC voltage Vab (or the second AC voltage Vgrid) period, or once every two first AC voltage Vab (or the second AC voltage Vgrid) periods, and so on. In this way, the times when the first arm 111 and the second arm 112 are in high-frequency switching and low-frequency switching will be symmetric, making the switching power consumption and temperature of the first arm 111 and the second arm 112 more balanced.

[0095] In addition, in some embodiments, the time points at which the first control signals CS11 to CS14 and the second control signals CS21 to CS24 switch between high-frequency operation and low-frequency operation can be any points (i.e., it is not limited to switching necessarily at the zero-crossing positions of the first AC voltage Vab or the second AC voltage Vgrid), but after each switch, a time multiple of the period of the first AC voltage Vab (or the second AC voltage Vgrid) needs to pass before the next switch can be made.

[0096] In addition, in some embodiments, the voltage levels of a part of the first control signals CS11 to CS14 are different from the voltage levels of another part of the first control signals CS11 to CS14. For example, Figure 2 as shown, when the voltage levels of the first control signals CS11 to CS12 are high voltage levels, the voltage levels of the first control signals CS13 to CS14 are low voltage levels. When the voltage levels of the first control signals CS11 to CS12 are low voltage levels, the voltage levels of the first control signals CS13 to CS14 are high voltage levels.

[0097] In addition, the voltage levels of a part of the second control signals CS21 to CS24 are different from the voltage levels of another part of the second control signals CS21 to CS24. For example, Figure 2 as shown, when the voltage levels of the second control signals CS21 to CS22 are high voltage levels, the voltage levels of the second control signals CS23 to CS24 are low voltage levels. When the voltage levels of the second control signals CS21 to CS22 are low voltage levels, the voltage levels of the second control signals CS23 to CS24 are high voltage levels.

[0098] Figure 3 is Figure 1 a detailed schematic diagram of the converter module. Please refer to Figure 3 , the first arm 111 of the converter module 110 includes a first switch unit SW1, a second switch unit SW2, a third switch unit SW3, a fourth switch unit SW4, a first diode D1, and a second diode D2.

[0099] The first switching unit SW1 has a first terminal, a second terminal, and a control terminal. The first terminal of the first switching unit SW1 is connected to the first DC voltage node N1. The control terminal of the first switching unit SW1 receives the first control signal CS11. Further, the first switching unit SW1 includes a first transistor T1, a first freewheeling diode DF1, and a first capacitor C1. The first transistor T1 has a first terminal, a second terminal, and a control terminal. The first terminal of the first transistor T1 is electrically connected to the first terminal of the first switching unit SW1. The second terminal of the first transistor T1 is electrically connected to the second terminal of the first switching unit SW1. The control terminal of the first transistor T1 is electrically connected to the control terminal of the first switching unit SW1. The first freewheeling diode DF1 has a first terminal (e.g., the cathode terminal) and a second terminal (e.g., the anode terminal). The first terminal of the first freewheeling diode DF1 is electrically connected to the first terminal of the first transistor T1. The second terminal of the first freewheeling diode DF1 is electrically connected to the second terminal of the first transistor T1.

[0100] The first capacitor C1 has a first terminal and a second terminal. The first terminal of the first capacitor C1 is electrically connected to the first terminal of the first freewheeling diode DF1. The second terminal of the first capacitor C1 is electrically connected to the second terminal of the first freewheeling diode DF1. In this embodiment, the first transistor T1 may be an N-type transistor, where the first terminal, the second terminal, and the control terminal of the first transistor T1 are respectively the drain terminal, the source terminal, and the gate terminal of the N-type transistor, but this embodiment is not limited thereto. In other embodiments, the first transistor T1 may be a P-type transistor or other suitable transistors. In this embodiment, the first capacitor C1 may be the parasitic capacitance of the first transistor T1 or the equivalent capacitance of the circuit.

[0101] In this embodiment, when the first transistor T1 is a metal-oxide-semiconductor field-effect transistor (MOSFET), the first freewheeling diode DF1 may be an internal element (e.g., a parasitic diode) of the first transistor T1. When the first transistor T1 is an insulated gate bipolar transistor (IGBT), the first freewheeling diode DF1 may be an external element of the first transistor T1. In this embodiment, the components and features included in the other switching units (SW2 to SW8) are the same as or similar to those of the first switching unit SW1. Therefore, the following introduction to the internal details of the switching units (i.e., the second transistor T2 to the eighth transistor T8, the second freewheeling diode D2 to the eighth freewheeling diode D8, and the second capacitor C2 to the eighth capacitor C8) can refer to the description of the first transistor T1, the first freewheeling diode DF1, and the first capacitor C1 and Figure 3 as shown, and will not be elaborated here.

[0102] The second switching unit SW2 has a first terminal, a second terminal, and a control terminal. The first terminal of the second switching unit SW2 is electrically connected to the second terminal of the first switching unit SW1. The second terminal of the second switching unit SW2 receives the first AC voltage Vab. The control terminal of the second switching unit SW2 receives the first control signal CS12.

[0103] The third switching unit SW3 has a first terminal, a second terminal, and a control terminal. The first terminal of the third switching unit SW3 is electrically connected to the second terminal of the second switching unit SW2. The control terminal of the third switching unit SW3 receives the first control signal CS13.

[0104] The fourth switching unit SW4 has a first terminal, a second terminal, and a control terminal. The first terminal of the fourth switching unit SW4 is electrically connected to the second terminal of the third switching unit SW3. The control terminal of the fourth switching unit SW4 receives the first control signal CS14. The second terminal of the fourth switching unit SW4 is connected to the second DC voltage node N2.

[0105] The first diode D1 has a first terminal (e.g., the cathode terminal) and a second terminal (e.g., the anode terminal). The first terminal of the first diode D1 is electrically connected to the second terminal of the first switching unit SW1. The second terminal of the first diode D1 is connected to the third DC voltage node N3. The second diode D2 has a first terminal (e.g., the cathode terminal) and a second terminal (e.g., the anode terminal). The first terminal of the second diode D2 is electrically connected to the second terminal of the first diode D1. The second terminal of the second diode D2 is electrically connected to the second terminal of the third switching unit SW3.

[0106] The second arm 112 of the converter module 110 includes a fifth switching unit SW5, a sixth switching unit SW6, a seventh switching unit SW7, an eighth switching unit SW8, a third diode D3, and a fourth diode D4.

[0107] The fifth switching unit SW5 has a first terminal, a second terminal, and a control terminal. The first terminal of the fifth switching unit SW5 is electrically connected to the first terminal of the first switching unit SW1. The control terminal of the fifth switching unit SW5 receives the second control signal CS21.

[0108] The sixth switching unit SW6 has a first terminal, a second terminal, and a control terminal. The first terminal of the sixth switching unit SW6 is electrically connected to the second terminal of the fifth switching unit SW5. The second terminal of the sixth switching unit SW6 receives the first AC voltage Vab. The control terminal of the sixth switching unit SW6 receives the second control signal CS22.

[0109] The seventh switching unit SW7 has a first terminal, a second terminal, and a control terminal. The first terminal of the seventh switching unit SW7 is electrically connected to the second terminal of the sixth switching unit SW6. The control terminal of the seventh switching unit SW7 receives the second control signal CS23.

[0110] The eighth switching unit SW8 has a first terminal, a second terminal, and a control terminal. The first terminal of the eighth switching unit SW8 is electrically connected to the second terminal of the seventh switching unit SW7. The second terminal of the eighth switching unit SW8 is electrically connected to the second terminal of the fourth switching unit SW4. The control terminal of the eighth switching unit SW8 receives a second control signal CS24.

[0111] The third diode D3 has a first terminal (e.g., the cathode terminal) and a second terminal (e.g., the anode terminal). The first terminal of the third diode D3 is electrically connected to the second terminal of the fifth switching unit SW5. The second terminal of the third diode D3 is electrically connected to the second terminal of the first diode D1. The fourth diode D4 has a first terminal (e.g., the cathode terminal) and a second terminal (e.g., the anode terminal). The first terminal of the fourth diode D4 is electrically connected to the second terminal of the third diode D3. The second terminal of the fourth diode D4 is electrically connected to the second terminal of the seventh switching unit SW7.

[0112] In addition, the converter module 110 further includes an inductor module 310, a first voltage stabilizing capacitor CO1, and a second voltage stabilizing capacitor CO2. The inductor module 310 can be electrically connected to the first arm 111 and the second arm 112. The inductor module 310 can receive a second AC voltage Vgrid to generate a first AC voltage Vab. In this embodiment, the second AC voltage Vgrid is, for example, a mains voltage, and the first AC voltage Vab is, for example, a converter voltage.

[0113] In addition, the control module 120 can also receive the second AC voltage Vgrid. In some embodiments, the control module 120 can generate first control signals CS11~CS14 and second control signals CS21~CS24 according to the first AC voltage Vab and a preset voltage VP, or the first AC voltage Vab, the preset voltage VP, and the second AC voltage Vgrid.

[0114] The first voltage stabilizing capacitor CO1 has a first terminal and a second terminal. The first terminal of the first voltage stabilizing capacitor CO1 is electrically connected to the first terminal of the first switching unit SW1 (i.e., the first DC voltage node N1). The second terminal of the first voltage stabilizing capacitor CO1 is electrically connected to the second terminal of the first diode D1 (i.e., the third DC voltage node N3) to form a first DC voltage VO1 across the two ends of the first voltage stabilizing capacitor CO1. The second voltage stabilizing capacitor CO2 has a first terminal and a second terminal. The first terminal of the second voltage stabilizing capacitor CO2 is electrically connected to the second terminal of the first voltage stabilizing capacitor CO1. The second terminal of the second voltage stabilizing capacitor CO2 is electrically connected to the second terminal of the fourth switching unit SW4 (i.e., the second DC voltage node N2) to form a second DC voltage VO2 across the two ends of the second voltage stabilizing capacitor CO2.

[0115] In this embodiment, when the first switch unit SW1 (the first transistor T1) and the second switch unit SW2 (the second transistor T2) are turned on, the third switch unit SW3 (the third transistor T3) and the fourth switch unit SW4 (the fourth transistor T4) are not turned on. That is, the voltage levels of the first control signals CS11 to CS12 are high voltage levels, and the voltage levels of the first control signals CS13 to CS14 are low voltage levels. When the first switch unit SW1 (the first transistor T1) and the second switch unit SW2 (the second transistor T2) are not turned on, the third switch unit SW3 (the third transistor T3) and the fourth switch unit SW4 (the fourth transistor T4) are turned on. That is, the voltage levels of the first control signals CS11 to CS12 are low voltage levels, and the voltage levels of the first control signals CS13 to CS14 are high voltage levels.

[0116] In addition, when the fifth switch unit SW5 (the fifth transistor T5) and the sixth switch unit SW6 (the sixth transistor T6) are turned on, the seventh switch unit SW7 (the seventh transistor T7) and the eighth switch unit SW8 (the eighth transistor T8) are not turned on. That is, the voltage levels of the second control signals CS21 to CS22 are high voltage levels, and the voltage levels of the second control signals CS23 to CS24 are low voltage levels. When the fifth switch unit SW5 (the fifth transistor T5) and the sixth switch unit SW6 (the sixth transistor T6) are not turned on, the seventh switch unit SW7 (the seventh transistor T7) and the eighth switch unit SW8 (the eighth transistor T8) are turned on. That is, the voltage levels of the second control signals CS21 to CS22 are low voltage levels, and the voltage levels of the second control signals CS23 to CS24 are high voltage levels.

[0117] Figure 4 is Figure 1 a detailed schematic diagram of the control module. In some embodiments, the control module 120 can receive the first AC voltage Vab and the preset voltage VP, and generate the third control signal CS3 and the fourth control signal CS4 according to the first AC voltage Vab and the preset voltage VP, and generate the first control signals CS11 to CS14 to the first arm 111 according to the third control signal CS3 and generate the second control signals CS21 to CS24 to the second arm 112 according to the fourth control signal CS4. Please refer to Figure 4 FIG., the control module 120 includes a first comparator 410, a second comparator 420, a first control signal generator 430, a second control signal generator 440, and a third control signal generator 450.

[0118] The first comparator 410 receives the first AC voltage Vab and a preset voltage VP. Then, the first comparator 410 can generate a first comparison signal CA1 based on the first AC voltage Vab, the preset voltage VP, the first carrier wave, and the second carrier wave. In this embodiment, the first carrier wave is, for example, greater than the preset voltage VP, the second carrier wave is, for example, less than the preset voltage VP, and the first carrier wave and the second carrier wave are, for example, triangular waves, but this embodiment is not limited thereto. Additionally, the first comparator 410 can compare the first AC voltage Vab with the first carrier wave to generate a first signal, and compare the first AC voltage Vab with the second carrier wave to generate a second signal. Then, the first comparator 410 processes the first signal and the second signal to generate the first comparison signal CA1. In this embodiment, the first comparator 410 is, for example, a quasi-two level (Q2L) comparator, and the first comparison signal CA1 is, for example, a high-frequency pulse modulation signal.

[0119] The second comparator 420 can receive the first AC voltage Vab and the preset voltage VP, and generate a second comparison signal CA2 based on the first AC voltage Vab and the preset voltage VP. Further, the second comparator 420 can compare the first AC voltage Vab with the preset voltage VP to generate the second comparison signal CA2. For example, when the first AC voltage Vab is greater than the preset voltage VP, the second comparator 420 generates a second comparison signal CA2 with a low level. When the first AC voltage Vab is less than the preset voltage VP, the second comparator 420 generates a second comparison signal CA2 with a high level. In this embodiment, the second comparison signal CA2 is, for example, a low-frequency pulse modulation signal.

[0120] In some embodiments, the first control signal generator 430 can receive the first comparison signal CA1, the second comparison signal CA2, and the first AC voltage Vab, and generate a third control signal CS3 and a fourth control signal CS4 based on the first comparison signal CA1, the second comparison signal CA2, and the first AC voltage Vab. For example, the first control signal generator 430 can determine the driving periods (such as driving periods T1 and T2) according to the positive half-cycle voltage and the negative half-cycle voltage of the first AC voltage Vab. Then, during the driving period T1, the first control signal generator 430, for example, generates a third control signal CS3 corresponding to the first comparison signal CA1 and a fourth control signal CS4 corresponding to the second comparison signal CA2. After that, during the driving period T2, the first control signal generator 430, for example, generates a third control signal CS3 corresponding to the second comparison signal CA2 and a fourth control signal CS4 corresponding to the first comparison signal CA1.

[0121] In some embodiments, the first control signal generator 430 may receive a first comparison signal CA1, a second comparison signal CA2, and a second AC voltage Vgrid, and generate a third control signal CS3 and a fourth control signal CS4 based on the first comparison signal CA1, the second comparison signal CA2, and the second AC voltage Vgrid. For example, the first control signal generator 430 may determine driving periods (such as driving periods T1, T2) based on the positive half-cycle voltage and the negative half-cycle voltage of the second AC voltage Vgrid. Then, during the driving period T1, the first control signal generator 430, for example, generates a third control signal CS3 corresponding to the first comparison signal CA1 and a fourth control signal CS4 corresponding to the second comparison signal CA2. After that, during the driving period T2, the first control signal generator 430, for example, generates a third control signal CS3 corresponding to the second comparison signal CA2 and a fourth control signal CS4 corresponding to the first comparison signal CA1.

[0122] The second control signal generator 440 receives the third control signal CS3 and generates first control signals CS11 - CS14 with the same operating frequency but different voltage levels based on the third control signal CS3. As Figure 2 shown, when the voltage levels of the first control signals CS11 - CS12 are high voltage levels, the voltage levels of the first control signals CS13 - CS14 are low voltage levels. When the voltage levels of the first control signals CS11 - CS12 are low voltage levels, the voltage levels of the first control signals CS13 - CS14 are high voltage levels.

[0123] The third control signal generator 450 receives the fourth control signal CS4 and generates second control signals CS21 - CS24 with the same operating frequency but different voltage levels based on the fourth control signal CS4. As Figure 2 shown, when the voltage levels of the second control signals CS21 - CS22 are high voltage levels, the voltage levels of the second control signals CS23 - CS24 are low voltage levels. When the voltage levels of the second control signals CS21 - CS22 are low voltage levels, the voltage levels of the second control signals CS23 - CS24 are high voltage levels.

[0124] In this embodiment, in each of multiple driving periods, the frequency of the third control signal CS3 is different from the frequency of the fourth control signal CS4. In at least two of the above driving periods, the frequencies of the third control signal CS3 are different. Various combinations and changes of other driving periods and control signal frequencies can be correspondingly referred to Figure 2 the description of the embodiments regarding the first control signals CS11 - CS14 and the second control signals CS21 - CS24, so details are not repeated here.

[0125] Figure 5Schematic diagram of a power converter according to another embodiment of the present invention. Please refer to Figure 5 , the power converter 500 includes an inverter module 510, an inductor module 520, and a control module 530.

[0126] The inverter module 510 has a first upper switch module 511, a first lower switch module 512, a second upper switch module 513, a second lower switch module 514, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first diode D1 is electrically connected to the first upper switch module 511. The second diode D2 is electrically connected to the first diode D1 and the first lower switch module 512. The third diode D3 is electrically connected to the first diode D1 and the second upper switch module 513. The fourth diode D4 is electrically connected to the third diode D3 and the second lower switch module 514. In this embodiment, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are the same as or similar to Figure 3 the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 of Figure 3 . For the description of the embodiment, it will not be repeated here.

[0127] The inverter module 510 receives a first AC voltage Vab, a plurality of first control signals CS11~CS14, and a plurality of second control signals CS21~CS24. The first upper switch module 511, the first lower switch module 512, the second upper switch module 513, and the second lower switch module 514 can convert the first AC voltage Vab into a first DC voltage VO1 and a second DC voltage VO2 according to the first control signals CS11~CS14 and the second control signals CS21~CS24.

[0128] The inductor module 520 is electrically connected to the first upper switch module 511, the first lower switch module 512, the second upper switch module 513, and the second lower switch module 514. The inductor module 520 receives a second AC voltage Vgrid to generate a first AC voltage Vab. In this embodiment, the inductor module 520 is the same as or similar to Figure 3 the inductor module 310 of Figure 3 . For the description of the embodiment, it will not be repeated here.

[0129] The control module 530 is electrically connected to the first upper switch module 511, the first lower switch module 512, the second upper switch module 513, the second lower switch module 514, and the inductor module 520. The control module 530 receives the first AC voltage Vab, the second AC voltage Vgrid, and the preset voltage VP, and generates the first control signals CS11 to CS14 to the first upper switch module 511 and the first lower switch module 512 and generates the second control signals CS21 to CS24 to the second upper switch module 513 and the lower switch module 514 according to the first AC voltage Vab and the preset voltage VP or the first AC voltage Vab, the preset voltage VP, and the second AC voltage Vgrid. In this embodiment, the operation mode of the control module 530 is the same as or similar to that of the Figure 1 and Figure 3 control module 120, and reference can be made to the description of the embodiments in Figure 1 and Figure 3 , so it will not be elaborated here.

[0130] In addition, the first upper switch module 511 may include the Figure 3 first switch unit SW1 and the second switch unit SW2, and the internal components and their electrical connections of the first switch unit SW1 and the second switch unit SW2 can be referred to the description of the embodiments in Figure 3 , so it will not be elaborated here. The first lower switch module 512 may include the Figure 3 third switch unit SW3 and the fourth switch unit SW4, and the internal components and their electrical connections of the third switch unit SW3 and the fourth switch unit SW4 can be referred to the description of the embodiments in Figure 3 , so it will not be elaborated here. The second upper switch module 513 may include the Figure 3 fifth switch unit SW5 and the sixth switch unit SW6, and the internal components and their electrical connections of the fifth switch unit SW5 and the sixth switch unit SW6 can be referred to the description of the embodiments in Figure 3 , so it will not be elaborated here. The second lower switch module 514 may include the Figure 3 seventh switch unit SW7 and the eighth switch unit SW8, and the internal components and their electrical connections of the seventh switch unit SW7 and the eighth switch unit SW8 can be referred to the description of the embodiments in Figure 3 , so it will not be elaborated here.

[0131] In addition, the converter module 510 further includes a first voltage stabilizing capacitor CO1 and a second voltage stabilizing capacitor CO2. In this embodiment, the first voltage stabilizing capacitor CO1 and the second voltage stabilizing capacitor CO2 are the same as or similar to the Figure 3 first voltage stabilizing capacitor voltage stabilization CO1 and the second voltage stabilizing capacitor CO2, and reference can be made to the description of the embodiments in Figure 3 , so it will not be elaborated here.

[0132] In summary, for the power converter disclosed in the present invention, the control module generates a first control signal to the first arm of the converter module (or the first upper switch module and the first lower switch module) based on the first AC voltage and a preset voltage, and generates a second control signal to the second arm of the converter module (or the second upper switch module and the second lower switch module). Among each of multiple driving periods, the frequency of the first control signal is different from the frequency of the second control signal, and among at least two of the driving periods, the frequencies of the first control signal are different. In this way, the switching power consumption and temperature of the first arm of the converter (or the first upper switch module and the first lower switch module) and the second arm of the converter (or the second upper switch module and the second lower switch module) can be effectively reduced, so as to avoid easy aging of components and limitation of module power.

[0133] Although the present invention is disclosed as above with embodiments, it is not intended to limit the scope of the present invention. Any person skilled in the art within the technical field, without departing from the concept and scope of the present invention, may make some changes and modifications. Therefore, the protection scope of the present invention shall be subject to that defined by the claims.

Claims

1. A power converter, comprising: An inverter module having a first arm and a second arm, the inverter module receiving a first AC voltage, a plurality of first control signals, and a plurality of second control signals, and the first arm and the second arm converting the first AC voltage into a first DC voltage and a second DC voltage according to the first control signals and the second control signals; and A control module electrically connected to the first arm and the second arm, the control module receiving the first AC voltage and a preset voltage, and generating the first control signals to the first arm and generating the second control signals to the second arm according to the first AC voltage and the preset voltage; Wherein, in each of a plurality of driving periods, the frequencies of the first control signals are different from the frequencies of the second control signals; Wherein, in at least two of the driving periods, the frequencies of the first control signals are different.

2. The power converter according to claim 1, wherein the levels of a part of the first control signals are different from the levels of another part of the first control signals, and the levels of a part of the second control signals are different from the levels of another part of the second control signals.

3. The power converter according to claim 1, wherein each of the driving periods is a time length including a positive half-cycle voltage and a negative half-cycle voltage of the first AC voltage.

4. The power converter according to claim 3, wherein the periods of frequency switching of the first control signals and the second control signals are multiples of the time length.

5. The power converter according to claim 1, wherein the inverter module further comprises: An inductor module electrically connected to the first arm and the second arm, the inductor module receiving a second AC voltage to generate the first AC voltage.

6. The power converter according to claim 5, wherein the control module further receives the second AC voltage, and the control module generates the first control signals and the second control signals according to the first AC voltage and the preset voltage or the first AC voltage, the preset voltage, and the second AC voltage.

7. The power converter according to claim 5, wherein the second AC voltage is a mains voltage and the first AC voltage is an inverter voltage.

8. The power converter according to claim 1, wherein the control module further generates a third control signal and a fourth control signal according to the first AC voltage and the preset voltage, and generates the first control signals according to the third control signal and generates the second control signals according to the fourth control signal; Among them, In each of the driving periods, the frequency of the third control signal is different from the frequency of the fourth control signal, the frequencies of the first control signals are the same as the frequency of the third control signal, and the frequencies of the second control signals are the same as the frequency of the fourth control signal; Wherein, in at least two of the driving periods, the frequencies of the third control signals are different.

9. The power converter as claimed in claim 8, wherein a voltage level of a part of the first control signals is the same as a voltage level of the third control signal, a voltage level of another part of the first control signals is different from the voltage level of the third control signal, a voltage level of a part of the second control signals is the same as a voltage level of the fourth control signal, and a voltage level of another part of the second control signals is different from the voltage level of the fourth control signal.

10. The power converter as claimed in claim 8, wherein the control module comprises: a first comparator, receiving the first AC voltage and the preset voltage, and generating a first comparison signal according to the first AC voltage, the preset voltage, a first carrier wave and a second carrier wave; a second comparator, receiving the first AC voltage and the preset voltage, and generating a second comparison signal according to the first AC voltage and the preset voltage; a first control signal generator, receiving the first comparison signal, the second comparison signal and the first AC voltage, and generating the third control signal and the fourth control signal according to the first comparison signal, the second comparison signal and the first AC voltage; a second control signal generator, receiving the third control signal, and generating the first control signals according to the third control signal; and a third control signal generator, receiving the fourth control signal, and generating the second control signals according to the fourth control signal.

11. The power converter as claimed in claim 1, wherein the first arm comprises: a first switch unit having a first end, a second end and a control end, the first end of the first switch unit being connected to a first DC voltage node, and the control end of the first switch unit receiving one of the first control signals; a second switch unit having a first end, a second end and a control end, the first end of the second switch unit being electrically connected to the second end of the first switch unit, the second end of the second switch unit receiving the first AC voltage, and the control end of the second switch unit receiving one of the first control signals; a third switch unit having a first end, a second end and a control end, the first end of the third switch unit being electrically connected to the second end of the second switch unit, and the control end of the third switch unit receiving one of the first control signals; a fourth switch unit having a first end, a second end and a control end, the first end of the fourth switch unit being electrically connected to the second end of the third switch unit, the second end of the fourth switch unit being electrically connected to a second DC voltage node, and the control end of the fourth switch unit receiving one of the first control signals; a first diode having a first end and a second end, the first end of the first diode being electrically connected to the second end of the first switch unit, and the second end of the first diode being electrically connected to a third DC voltage node; a second diode having a first end and a second end, the first end of the second diode being electrically connected to the second end of the first diode, and the second end of the second diode being electrically connected to the second end of the third switch unit.

12. The power converter according to claim 11, wherein the second arm comprises: a fifth switching unit having a first end, a second end and a control end, the first end of the fifth switching unit being electrically connected to the first end of the first switching unit, and the control end of the fifth switching unit receiving one of the second control signals; a sixth switching unit having a first end, a second end and a control end, the first end of the sixth switching unit being electrically connected to the second end of the fifth switching unit, the second end of the sixth switching unit receiving the first AC voltage, and the control end of the sixth switching unit receiving one of the second control signals; a seventh switching unit having a first end, a second end and a control end, the first end of the seventh switching unit being electrically connected to the second end of the sixth switching unit, and the control end of the seventh switching unit receiving one of the second control signals; an eighth switching unit having a first end, a second end and a control end, the first end of the eighth switching unit being electrically connected to the second end of the seventh switching unit, the second end of the eighth switching unit being electrically connected to the second end of the fourth switching unit, and the control end of the eighth switching unit receiving one of the second control signals; a third diode having a first end and a second end, the first end of the third diode being electrically connected to the second end of the fifth switching unit, and the second end of the third diode being electrically connected to the second end of the first diode; and a fourth diode having a first end and a second end, the first end of the fourth diode being electrically connected to the first end of the third diode, and the second end of the fourth diode being electrically connected to the second end of the seventh switching unit.

13. The power converter according to claim 11, wherein the converter module further comprises: a first voltage stabilizing capacitor having a first end and a second end, the first end of the first voltage stabilizing capacitor being electrically connected to the first end of the first switching unit, and the second end of the first voltage stabilizing capacitor being electrically connected to the second end of the first diode; and a second voltage stabilizing capacitor having a first end and a second end, the first end of the second voltage stabilizing capacitor being electrically connected to the second end of the first voltage stabilizing capacitor, and the second end of the second voltage stabilizing capacitor being electrically connected to the second end of the fourth switching unit.

14. A power converter, comprising: A converter module, having a first upper switch module, a first lower switch module, a second upper switch module, a second lower switch module, a first diode, a second diode, a third diode and a fourth diode. The first diode is electrically connected to the first upper switch module. The second diode is electrically connected to the first diode and the first lower switch module. The third diode is electrically connected to the first diode and the second upper switch module. The fourth diode is electrically connected to the third diode and the second lower switch module. The converter module receives a first AC voltage, a plurality of first control signals and a plurality of second control signals. And the first upper switch module, the first lower switch module, the second upper switch module and the second lower switch module convert the first AC voltage into a first DC voltage and a second DC voltage according to the first control signals and the second control signals; An inductor module, electrically connected to the first upper switch module, the first lower switch module, the second upper switch module and the second lower switch module. The inductor module receives a second AC voltage to generate the first AC voltage; A control module, electrically connected to the first upper switch module, the first lower switch module, the second upper switch module, the second lower switch module and the inductor module. The control module receives the first AC voltage and a preset voltage, and generates the first control signals to the first upper switch module and the first lower switch module and generates the second control signals to the second upper switch module and the second lower switch module according to the first AC voltage and the preset voltage; Wherein, in at least two of a plurality of driving periods, the frequencies of the first control signals are different.

15. The power converter according to claim 14, wherein the voltage levels of the first control signals of the first upper switch module are different from the voltage levels of the first control signals of the first lower switch module, and the voltage levels of the second control signals of the second upper switch module are different from the voltage levels of the second control signals of the second lower switch module.

16. The power converter according to claim 14, wherein the periods of frequency switching of the first control signals and the second control signals are a multiple of the period of the first AC voltage or the second AC voltage.

17. The power converter according to claim 16, wherein the multiple is a natural number greater than or equal to 1.

18. The power converter according to claim 14, wherein the first upper switch module includes a first switch unit, having a first end, a second end and a control end. The first end of the first switch unit is electrically connected to a first DC voltage node, and the control end of the first switch unit receives one of the first control signals; and a second switch unit, having a first end, a second end and a control end. The first end of the second switch unit is electrically connected to the second end of the first switch unit. The second end of the second switch unit receives the first AC voltage, and the control end of the second switch unit receives one of the first control signals; The first lower switch module includes a third switch unit having a first end, a second end, and a control end. The first end of the third switch unit is electrically connected to the second end of the second switch unit, and the control end of the third switch unit receives one of the first control signals. And a fourth switch unit having a first end, a second end, and a control end. The first end of the fourth switch unit is electrically connected to the second end of the third switch unit, the control end of the fourth switch unit receives one of the first control signals, and the second end of the fourth switch unit is electrically connected to a second DC voltage node.

19. The power converter as claimed in claim 18, wherein the second upper switch module includes a fifth switch unit having a first end, a second end, and a control end. The first end of the fifth switch unit is electrically connected to the first end of the first switch unit, and the control end of the fifth switch unit receives one of the second control signals. And a sixth switch unit having a first end, a second end, and a control end. The first end of the sixth switch unit is electrically connected to the second end of the fifth switch unit, the second end of the sixth switch unit receives the first AC voltage, and the control end of the sixth switch unit receives one of the second control signals. The second upper switch module includes a seventh switch unit having a first end, a second end, and a control end. The first end of the seventh switch unit is electrically connected to the second end of the sixth switch unit, and the control end of the seventh switch unit receives one of the second control signals. And an eighth switch unit having a first end, a second end, and a control end. The first end of the eighth switch unit is electrically connected to the second end of the seventh switch unit, the second end of the eighth switch unit is electrically connected to the second end of the fourth switch unit, and the control end of the eighth switch unit receives one of the second control signals.

20. The power converter as claimed in claim 18, wherein the converter module further comprises: a first voltage stabilizing capacitor having a first end and a second end. The first end of the first voltage stabilizing capacitor is electrically connected to the first DC voltage node, and the second end of the first voltage stabilizing capacitor, the common connection point of the first diode and the second diode, and the common connection point of the third diode and the fourth diode are electrically connected to a third DC voltage node. And a second voltage stabilizing capacitor having a first end and a second end. The first end of the second voltage stabilizing capacitor is electrically connected to the third DC voltage node, and the second end of the second voltage stabilizing capacitor is electrically connected to the second DC voltage node.

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