Dc-ac converter, method and apparatus for controlling a dc-ac converter

Abstract

The application discloses a direct-current alternating-current converter, a control method and device of the direct-current alternating-current converter. It relates to the technical field of power electronic devices, and the method comprises the following steps: controlling the on-off state of a switching device in a double-switch double-diode bridge circuit, so as to control the dynamic fluctuation of an inductor current along a first current curve and a second current curve, wherein the inductor current is the current flowing through a first inductor and a second inductor, and the first current curve is higher than the second current curve; and controlling the on-off state of a switching device in a four-switch four-diode bridge circuit, so as to control the dynamic fluctuation of an output voltage along a first voltage curve and a second voltage curve, wherein the output voltage is the voltage of alternating current output by the four-switch four-diode bridge circuit, and the first voltage curve is higher than the second voltage curve, thereby solving the problem that the current direct-current alternating-current converter cannot meet the requirement of high dynamic and high bandwidth for power supply of a hybrid power amplifier.

Description

Technical Field

[0001] This application relates to the field of power electronic equipment technology, and more specifically, to a DC-AC converter, a control method for the DC-AC converter, and a device for the control of the DC-AC converter. Background Technology

[0002] DC-AC converters are mainly used for power frequency output of 50Hz or 60Hz, and are typically used in low-frequency power supply applications such as uninterruptible power supplies and grid connection of new energy solar photovoltaic power generation. However, when DC-AC converters are used to power hybrid power amplifiers, current DC-AC converters do not meet the high dynamic and high bandwidth performance required for power supply of hybrid power amplifiers. Summary of the Invention

[0003] This application provides a DC-AC converter, a control method for the DC-AC converter, and an apparatus to solve the problem that current DC-AC converters do not meet the high dynamic range and high bandwidth requirements of hybrid power amplifiers.

[0004] According to an embodiment of this application, a DC-AC converter is provided, comprising: a dual-switch dual-diode bridge circuit, wherein a first input terminal and a second input terminal of the dual-switch dual-diode bridge circuit are used to connect to the positive and negative terminals of a DC power supply, a first output terminal of the dual-switch dual-diode bridge circuit is connected to the input terminal of a first inductor, and a second output terminal of the dual-switch dual-diode bridge circuit is connected to the output terminal of a second inductor, wherein the dual-switch dual-diode bridge circuit is used to regulate the current flowing through the first inductor and the second inductor; a four-switch four-diode bridge circuit, wherein the input terminal of the four-switch four-diode bridge circuit is connected to the output terminal of the first inductor, the first output terminal of the four-switch four-diode bridge circuit is connected to the input terminal of the second inductor, the second output terminal of the four-switch four-diode bridge circuit is an AC power supply output terminal, and a third output terminal is an AC power supply reference terminal, wherein the four-switch four-diode bridge circuit is used to regulate the magnitude of the output AC voltage; and a capacitor, wherein the two ends of the capacitor are respectively connected to the second output terminal and the third output terminal of the four-switch four-diode bridge circuit.

[0005] Optionally, the dual-switch dual-diode bridge circuit includes a first branch and a second branch connected in parallel; wherein, the first branch includes a first switching device and a first diode connected in series, the input terminal of the first switching device is connected to the positive terminal of the DC power supply, the output terminal of the first switching device is connected to the cathode of the first diode, the anode of the first diode is connected to the negative terminal of the DC power supply, and the output terminal of the first switching device and the cathode of the first diode are the first output terminal of the dual-switch dual-diode bridge circuit; wherein, the second branch includes a second switching device and a second diode connected in series, the cathode of the second diode is connected to the positive terminal of the DC power supply, the anode of the second diode is connected to the input terminal of the second switching device, the output terminal of the second switching device is connected to the negative terminal of the DC power supply, and the anode of the second diode and the input terminal of the second switching device are the second output terminal of the dual-switch dual-diode bridge circuit.

[0006] Optionally, the four-switch four-diode bridge circuit includes a third branch and a fourth branch connected in parallel; wherein, the third branch includes a first unidirectional switch and a second unidirectional switch connected in series, the input terminals of the first unidirectional switch and the second unidirectional switch are connected, the input terminals of the first unidirectional switch and the second unidirectional switch are the input terminals of the four-switch four-diode bridge circuit, the output terminal of the first unidirectional switch is the first output terminal of the four-switch four-diode bridge circuit, and the output terminal of the second unidirectional switch is the second output terminal of the four-switch four-diode bridge circuit; wherein, the fourth branch includes a third unidirectional switch and a fourth unidirectional switch connected in series, the output terminals of the third unidirectional switch and the fourth unidirectional switch are connected, the output terminals of the third unidirectional switch and the fourth unidirectional switch are the first output terminal of the four-switch four-diode bridge circuit, the input terminal of the third unidirectional switch is the second output terminal of the four-switch four-diode bridge circuit, and the input terminal of the fourth unidirectional switch is the third output terminal of the four-switch four-diode bridge circuit.

[0007] Optionally, the DC-AC converter further includes: a first unidirectional switch comprising a third switching device and a third diode connected in series, the output terminal of the third switching device and the anode of the third diode being connected, the input terminal of the third switching device being the input terminal of the first unidirectional switch, and the cathode of the third diode being the output terminal of the first unidirectional switch; a second unidirectional switch comprising a fourth switching device and a fourth diode connected in series, the output terminal of the fourth switching device and the anode of the fourth diode being connected, the input terminal of the fourth switching device being the input terminal of the second unidirectional switch, and the cathode of the fourth diode being the output terminal of the second unidirectional switch; a third unidirectional switch comprising a fifth switching device and a fifth diode connected in series, the input terminal of the fifth switching device and the cathode of the fifth diode being connected, the output terminal of the fifth switching device being the output terminal of the third unidirectional switch, and the anode of the fifth diode being the input terminal of the third unidirectional switch; and a fourth unidirectional switch comprising a sixth switching device and a sixth diode connected in series, the input terminal of the sixth switching device and the cathode of the sixth diode being connected, the output terminal of the sixth switching device being the output terminal of the fourth unidirectional switch, and the cathode of the sixth diode being the input terminal of the fourth unidirectional switch.

[0008] According to one aspect of this application, a control method for a DC-AC converter is provided. The method includes: controlling the on / off state of switching devices in a dual-switch dual-diode bridge circuit to control the inductor current to dynamically fluctuate along a first current curve and a second current curve, wherein the inductor current is the current flowing through the first and second inductors, and the first current curve is higher than the second current curve; and controlling the on / off state of switching devices in a four-switch four-diode bridge circuit to control the output voltage to dynamically fluctuate along a first voltage curve and a second voltage curve, wherein the output voltage is the AC voltage output by the four-switch four-diode bridge circuit, and the first voltage curve is higher than the second voltage curve.

[0009] Optionally, controlling the on / off state of the switching devices in the dual-switch dual-diode bridge circuit to control the dynamic fluctuation of the inductor current along the first current curve and the second current curve includes: when the inductor current is lower than the first current curve, controlling the first and second switching devices in the dual-switch dual-diode bridge circuit to be turned on until the inductor current is higher than the first current curve; when the inductor current is higher than the first current curve, maintaining the on state of the second switching device, controlling the first switching device to be turned off, and detecting the inductor current; when the inductor current is still higher than the first current curve, controlling the first and second switching devices to be turned off until the inductor current is lower than the second current curve.

[0010] Optionally, controlling the on / off state of the switching devices in the four-switch, four-diode bridge circuit to control the dynamic fluctuation of the output voltage along the first voltage curve and the second voltage curve includes: when the output voltage is lower than the first voltage curve, controlling the third and sixth switching devices in the four-switch, four-diode bridge circuit to conduct until the output voltage is higher than the first voltage curve; when the output voltage is higher than the first voltage curve, controlling the fourth and sixth switching devices in the four-switch, four-diode bridge circuit to conduct, and detecting the output voltage; when the output voltage is still higher than the first voltage curve, maintaining the conduction state of the fourth switching device, and controlling the fifth switching device in the four-switch, four-diode bridge circuit to conduct until the output voltage is lower than the second voltage curve; when the output voltage is lower than the second voltage curve, controlling the fourth and sixth switching devices to conduct, and detecting the output voltage; when the output voltage is still lower than the second voltage curve, maintaining the conduction state of the sixth switching device, and controlling the third switching device to conduct until the output voltage is higher than the first voltage curve.

[0011] According to another aspect of this application, a control device for a DC-AC converter is provided. The device includes: a first control unit for controlling the on / off state of switching devices in a dual-switch dual-diode bridge circuit to control the inductor current to dynamically fluctuate along a first current curve and a second current curve, wherein the inductor current is the current flowing through the first and second inductors, and the first current curve is higher than the second current curve; and a second control unit for controlling the on / off state of switching devices in a four-switch four-diode bridge circuit to control the output voltage to dynamically fluctuate along a first voltage curve and a second voltage curve, wherein the output voltage is the AC voltage output by the four-switch four-diode bridge circuit, and the first voltage curve is higher than the second voltage curve.

[0012] According to another aspect of this application, an electronic device is also provided, comprising a processor and a memory; the memory stores computer-readable instructions, and the processor is used to execute the computer-readable instructions, wherein the computer-readable instructions execute a control method for a DC-AC converter.

[0013] According to another aspect of this application, a computer program product is provided, including a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements any of the above-described control methods for a DC-AC converter.

[0014] This application employs the following steps: controlling the on / off state of the switching devices in a dual-switch dual-diode bridge circuit to control the dynamic fluctuation of the inductor current along a first current curve and a second current curve, wherein the inductor current is the current flowing through the first and second inductors, and the first current curve is higher than the second current curve; controlling the on / off state of the switching devices in a four-switch four-diode bridge circuit to control the dynamic fluctuation of the output voltage along a first voltage curve and a second voltage curve, wherein the output voltage is the AC voltage output by the four-switch four-diode bridge circuit, and the first voltage curve is higher than the second voltage curve. This solves the problem that current DC-AC converters do not meet the high dynamic range and high bandwidth requirements for hybrid power amplifier power supply. By cascading the dual-switch dual-diode bridge circuit and the four-switch four-diode bridge circuit, high dynamic control of the inductor current is achieved through the dual-switch dual-diode bridge circuit, thereby achieving high dynamic control of the output current; and high dynamic control of the output voltage is achieved through the four-switch four-diode bridge circuit, thus achieving the effect of outputting high dynamic range and high bandwidth AC power. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0016] Figure 1 The circuit of the DC-AC converter provided according to the embodiments of this application. Figure 1 ;

[0017] Figure 2 This is an optional DC-AC converter circuit provided according to embodiments of this application. Figure 2 ;

[0018] Figure 3 This is a flowchart of a control method for a DC-AC converter according to an embodiment of this application;

[0019] Figure 4 It is a graph showing the fluctuations of the first and second current curves;

[0020] Figure 5 It is a graph showing the fluctuations of the first and second voltage curves;

[0021] Figure 6 This is a schematic diagram of a control device for a DC-AC converter according to an embodiment of this application;

[0022] Figure 7 This is a schematic diagram of an electronic device according to an embodiment of this application. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0025] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] According to an embodiment of this application, a DC-AC converter is provided.

[0027] Figure 1 The circuit of the DC-AC converter provided according to the embodiments of this application. Figure 1 .like Figure 1 As shown, the circuit of the DC-AC converter includes: a dual-switch dual-diode bridge circuit 10, a four-switch four-diode bridge circuit 20, and a capacitor C1.

[0028] It should be noted that the dual-switch dual-diode bridge circuit 10 in this embodiment is powered by the DC power supply at the input terminal of the DC-AC converter, and the four-switch four-diode bridge circuit 20 charges the capacitor C1 at the output terminal of the DC-AC converter.

[0029] The first input terminal of the dual-switch dual-diode bridge circuit 10 is used to connect to the positive terminal of the DC power supply, and the second input terminal of the dual-switch dual-diode bridge circuit 10 is used to connect to the negative terminal of the DC power supply. The first output terminal of the dual-switch dual-diode bridge circuit 10 is connected to the input terminal of the first inductor L1, and the second output terminal of the dual-switch dual-diode bridge circuit 10 is connected to the output terminal of the second inductor L2. The dual-switch dual-diode bridge circuit 10 is used to regulate the current flowing through the first inductor L1 and the second inductor L2.

[0030] The input terminal of the four-switch four-diode bridge circuit 20 is connected to the output terminal of the first inductor L1, the first output terminal of the four-switch four-diode bridge circuit 20 is connected to the input terminal of the second inductor L2, the second output terminal of the four-switch four-diode bridge circuit 20 is the AC power output terminal, and the third output terminal is the AC power reference terminal. The four-switch four-diode bridge circuit 20 is used to adjust the magnitude of the output AC voltage.

[0031] The two ends of capacitor C1 are connected to the second and third output terminals of the four-switch four-diode bridge circuit 20, respectively.

[0032] Figure 2 This is an optional DC-AC converter circuit provided according to embodiments of this application. Figure 2 ,like Figure 2 As shown: Optionally, in the DC-AC converter provided in this application embodiment, the dual-switch dual-diode bridge circuit 10 includes a first branch and a second branch connected in parallel; wherein, the first branch includes a first switching device Q1 and a first diode D1 connected in series, the input terminal of the first switching device Q1 is connected to the positive terminal of the DC power supply, the output terminal of the first switching device Q1 is connected to the cathode of the first diode D1, the anode of the first diode D1 is connected to the negative terminal of the DC power supply, and the output terminal of the first switching device Q1 and the cathode of the first diode D1 are the first output terminal of the dual-switch dual-diode bridge circuit 10; wherein, the second branch includes a second switching device Q2 and a second diode D2 connected in series, the cathode of the second diode D2 is connected to the positive terminal of the DC power supply, the anode of the second diode D2 is connected to the input terminal of the second switching device Q2, the output terminal of the second switching device Q2 is connected to the negative terminal of the DC power supply, and the anode of the second diode D2 and the input terminal of the second switching device Q2 are the second output terminal of the dual-switch dual-diode bridge circuit 10. Wherein, the first switching device Q1 and the second switching device Q2 can be MOSFETs.

[0033] Specifically, when a DC power supply is connected to the input terminal of the dual-switch dual-diode bridge circuit 10, controlling the first switch Q1 and the second switch Q2 to conduct, both the first branch and the second branch work, causing the current flowing through the first inductor L1 and the second inductor L2 to increase; controlling the first switch Q1 to disconnect and controlling the second switch Q2 to conduct, the first branch does not work and the second branch works. The change in the current flowing through the first inductor L1 and the second inductor L2 depends on the working state of the four-switch four-diode bridge circuit. If the four-switch four-diode bridge circuit outputs current, the current flowing through the first inductor L1 and the second inductor L2 decreases; if the four-switch four-diode bridge circuit absorbs current, the current flowing through the first inductor L1 and the second inductor L2 increases; controlling the first switch Q1 and the second switch Q2 to disconnect, both the first branch and the second branch do not work, causing the current flowing through the first inductor L1 and the second inductor L2 to decrease, and the DC power supply continues to absorb energy.

[0034] Optionally, in the DC-AC converter provided in this application embodiment, the four-switch four-diode bridge circuit 20 includes a third branch and a fourth branch connected in parallel; wherein, the third branch includes a first unidirectional switch and a second unidirectional switch connected in series, the input terminals of the first unidirectional switch and the second unidirectional switch are connected, the input terminals of the first unidirectional switch and the second unidirectional switch are the input terminals of the four-switch four-diode bridge circuit 20, the output terminal of the first unidirectional switch is the first output terminal of the four-switch four-diode bridge circuit 20, and the output terminal of the second unidirectional switch is the second output terminal of the four-switch four-diode bridge circuit 20; wherein, the fourth branch includes a third unidirectional switch and a fourth unidirectional switch connected in series, the output terminals of the third unidirectional switch and the fourth unidirectional switch are connected, the output terminals of the third unidirectional switch and the fourth unidirectional switch are the first output terminal of the four-switch four-diode bridge circuit 20, the input terminal of the third unidirectional switch is the second output terminal of the four-switch four-diode bridge circuit 20, and the input terminal of the fourth unidirectional switch is the third output terminal of the four-switch four-diode bridge circuit 20.

[0035] Optionally, in the DC-AC converter provided in this application embodiment, the DC-AC converter further includes: a first unidirectional switch, comprising a third switching device Q3 and a third diode D3 connected in series, the output terminal of the third switching device Q3 and the anode of the third diode D3 being connected, the input terminal of the third switching device Q3 being the input terminal of the first unidirectional switch, and the cathode of the third diode D3 being the output terminal of the first unidirectional switch; a second unidirectional switch, comprising a fourth switching device Q4 and a fourth diode D4 connected in series, the output terminal of the fourth switching device Q4 and the anode of the fourth diode D4 being connected, the input terminal of the fourth switching device Q4 being the input terminal of the second unidirectional switch, and the fourth diode D3 being the output terminal of the second unidirectional switch; The cathode of D4 is the output terminal of the second unidirectional switch; the third unidirectional switch includes a fifth switching device Q5 and a fifth diode D5 connected in series, with the input terminal of the fifth switching device Q5 connected to the cathode of the fifth diode D5, the output terminal of the fifth switching device Q5 being the output terminal of the third unidirectional switch, and the anode of the fifth diode D5 being the input terminal of the third unidirectional switch; the fourth unidirectional switch includes a sixth switching device Q6 and a sixth diode D6 connected in series, with the input terminal of the sixth switching device Q6 connected to the cathode of the sixth diode D6, the output terminal of the sixth switching device Q6 being the output terminal of the fourth unidirectional switch, and the cathode of the sixth diode D6 being the input terminal of the fourth unidirectional switch. The first, second, third, and fourth unidirectional switches may include MOSFETs and diodes connected in series.

[0036] Specifically, the input terminal of the four-switch, four-diode bridge circuit 20 is connected to the first inductor L1. When current flows through the first inductor L1, the third switch Q3 and the sixth switch Q6 are turned on, and the fourth switch Q4 and the fifth switch Q5 are turned off. The current flows through the third switch Q3, the third diode D3, the capacitor C1, the sixth diode Q6, and the sixth switch Q5, respectively. At this time, the voltage across the capacitor C1 increases, and the output voltage increases. When the sixth switch Q6 and the fourth switch Q4 are turned on, the current is turned off and no longer output. The current then flows through the fourth switch... When the current flows back through diodes Q4, D4, D6, and Q6, the output voltage changes depending on the direction of the output current. If the output current flows from capacitor C1 to the load, the output voltage decreases; if the output current flows from the load to capacitor C1, the output voltage increases. Switching devices Q3 and Q6 are disconnected, while Q4 and Q5 are turned on, causing the current to flow from capacitor C1 to the second inductor L2. This is equivalent to capacitor C1 supplying power to the dual-switch dual-diode bridge circuit 10, resulting in a decrease in the voltage across capacitor C1 and a decrease in the output voltage.

[0037] According to an embodiment of this application, a control method for a DC-AC converter is provided.

[0038] Figure 3 This is a flowchart of a control method for a DC-AC converter according to an embodiment of this application. Figure 3 As shown, the method includes the following steps:

[0039] Step S301: Control the on / off state of the switching devices in the dual-switch dual-diode bridge circuit 10 to control the inductor current to dynamically fluctuate along the first current curve and the second current curve. The inductor current is the current flowing through the first inductor L1 and the second inductor L2. The first current curve is higher than the second current curve.

[0040] Figure 4 It is a graph showing the fluctuations of the first and second current curves, such as... Figure 4 As shown, the current value in the first current curve is the upper limit target value of the inductor current, and the current value in the second current curve is the lower limit target value of the inductor current. The average of the upper and lower target values ​​is the target value. The inductor current fluctuates around the target value, and the fluctuation range spans both the upper and lower target values. When the inductor current is higher than the upper target value, the current needs to decrease until it falls below the lower target value. When the current falls below the lower target value, the current needs to rise again to exceed the upper target value, so that the inductor current traverses back and forth between the upper and lower target values, corresponding to the aforementioned dynamic fluctuations.

[0041] Step S302: Control the on / off state of the switching devices in the four-switch four-diode bridge circuit 20 to control the output voltage to dynamically fluctuate along the first voltage curve and the second voltage curve. The output voltage is the voltage of the AC power output by the four-switch four-diode bridge circuit 20, and the first voltage curve is higher than the second voltage curve.

[0042] Figure 5 It is a graph showing the fluctuations of the first and second voltage curves, such as... Figure 5 As shown, the voltage value in the first voltage curve is the upper limit target value of the output voltage, and the voltage value in the second voltage curve is the lower limit target value of the output voltage. The average of the upper and lower target values ​​is the target value. The output voltage fluctuates around the target value, and the fluctuation range spans both the upper and lower target values. When the output voltage is higher than the upper target value, it needs to be reduced until it falls below the lower target value. When the output voltage is lower than the lower target value, it needs to be increased back above the upper target value, so that the output voltage traverses back and forth between the upper and lower target values, corresponding to the aforementioned dynamic fluctuation.

[0043] Optionally, in the control method of the DC-AC converter provided in the embodiments of this application, controlling the on / off state of the switching devices in the dual-switch dual-diode bridge circuit 10 to control the dynamic fluctuation of the inductor current along the first current curve and the second current curve includes: when the inductor current is lower than the first current curve, controlling the first switching device Q1 and the second switching device Q2 in the dual-switch dual-diode bridge circuit 10 to be turned on until the inductor current is higher than the first current curve; when the inductor current is higher than the first current curve, maintaining the on state of the second switching device Q2, controlling the first switching device Q1 to be turned off, and detecting the inductor current; when the inductor current is still higher than the first current curve, controlling the first switching device Q1 and the second switching device Q2 to be turned off until the inductor current is lower than the second current curve.

[0044] It should be noted that when both the first switching device Q1 and the second switching device Q2 are turned on, the inductor current will definitely increase; when the first switching device Q1 is turned off and the second switching device Q2 is turned on, the inductor current may increase or decrease; when both the first switching device Q1 and the second switching device Q2 are turned off, the inductor current will definitely decrease.

[0045] When the inductor current is lower than the upper limit target value (corresponding to the current value of the first current curve mentioned above), the inductor current needs to increase. Therefore, the first switching device Q1 and the second switching device Q2 are turned on, and the inductor current increases until it exceeds the upper limit target value. When the inductor current is higher than the upper limit target value, the inductor current needs to decrease. Therefore, the first switching device Q1 is turned off, and the second switching device Q2 is turned on. At this time, the decrease in inductor current may be small, so it is necessary to further detect whether the inductor current has decreased to below the upper limit target value. If the inductor current is still higher than the upper limit target value, the first switching device Q1 and the second switching device Q2 are turned off until the inductor current is lower than the lower limit target value (corresponding to the current value of the second current curve mentioned above).

[0046] Optionally, in the control method of the DC-AC converter provided in the embodiments of this application, controlling the on / off state of the switching devices in the four-switch four-diode bridge circuit 20 to control the dynamic fluctuation of the output voltage along the first voltage curve and the second voltage curve includes: when the output voltage is lower than the first voltage curve, controlling the third switching device Q3 and the sixth switching device Q6 in the four-switch four-diode bridge circuit 20 to conduct until the output voltage is higher than the first voltage curve; when the output voltage is higher than the first voltage curve, controlling the fourth switching device Q4 and the sixth switching device Q6 in the four-switch four-diode bridge circuit 20 to conduct, and detecting the output voltage; when the output voltage is still higher than the first voltage curve, maintaining the conducting state of the fourth switching device Q4, and controlling the fifth switching device Q5 in the four-switch four-diode bridge circuit 20 to conduct until the output voltage is lower than the second voltage curve; when the output voltage is lower than the second voltage curve, controlling the fourth switching device Q4 and the sixth switching device Q6 to conduct, and detecting the output voltage; when the output voltage is still lower than the second voltage curve, maintaining the conducting state of the sixth switching device Q6, and controlling the third switching device to conduct until the output voltage is higher than the first voltage curve.

[0047] It should be noted that when the third switch Q3 and the sixth switch Q6 are turned on, the output voltage will definitely rise; when the fourth switch Q4 and the sixth switch Q6 are turned on, the output voltage may rise or fall; when the fourth switch Q4 and the fifth switch Q5 are turned on, the output voltage will definitely fall.

[0048] When the output voltage is lower than the upper target value (corresponding to the voltage value of the first voltage curve mentioned above), the output voltage needs to rise. Therefore, the third switch Q3 and the sixth switch Q6 are turned on, and the output voltage rises until it exceeds the upper target value. When the output voltage is higher than the upper target value, the output voltage needs to fall. Therefore, the fourth switch Q4 is turned on, while the sixth switch Q6 remains on. At this point, the output voltage may rise or fall, so it is necessary to further detect whether the output voltage has fallen below the upper target value. If the output voltage is still higher than the upper target value... If the target value is reached, the fourth switch Q4 is kept on, and the fifth switch Q5 is turned on until the output voltage is lower than the lower limit target value (corresponding to the voltage value of the second voltage curve mentioned above). When the output voltage is lower than the lower limit target value, the fourth switch Q4 and the sixth switch Q6 are turned on. At this time, the output voltage may rise or fall, so it is necessary to further detect whether the output voltage rises to a value higher than the lower limit target value. If the output voltage is still lower than the lower limit target value, the third switch Q3 and the sixth switch Q6 are turned on until the output voltage is higher than the lower limit target value.

[0049] The DC-AC converter control method provided in this application embodiment controls the on / off state of the switching devices in the dual-switch dual-diode bridge circuit 10 to control the dynamic fluctuation of the inductor current along a first current curve and a second current curve. The inductor current is the current flowing through the first inductor L1 and the second inductor L2, and the first current curve is higher than the second current curve. Similarly, the method controls the on / off state of the switching devices in the four-switch four-diode bridge circuit 20 to control the dynamic fluctuation of the output voltage along a first voltage curve and a second voltage curve. The output voltage is the AC voltage output by the four-switch four-diode bridge circuit 20, and the first voltage curve is higher than the second voltage curve. This solves the problem that current DC-AC converters do not meet the high dynamic range and high bandwidth requirements for hybrid power amplifier power supply. By cascading the dual-switch dual-diode bridge circuit and the four-switch four-diode bridge circuit, high dynamic control of the inductor current is achieved through the dual-switch dual-diode bridge circuit, thereby achieving high dynamic control of the output current. The high dynamic control of the output voltage is achieved through the four-switch four-diode bridge circuit, thus achieving the effect of outputting high dynamic range and high bandwidth AC power.

[0050] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0051] This application also provides a control device for a DC-AC converter. It should be noted that the control device for the DC-AC converter in this application can be used to execute the control method for the DC-AC converter provided in this application. The control device for the DC-AC converter provided in this application is described below.

[0052] Figure 6 This is a schematic diagram of a control device for a DC-AC converter according to an embodiment of this application. Figure 6 As shown, the device includes: a first control unit 601 and a second control unit 602.

[0053] The first control unit 601 is used to control the on / off state of the switching devices in the dual-switch dual-diode bridge circuit 10, so as to control the inductor current to dynamically fluctuate along the first current curve and the second current curve, wherein the inductor current is the current flowing through the first inductor L1 and the second inductor L2, and the first current curve is higher than the second current curve.

[0054] The second control unit 602 is used to control the on / off state of the switching devices in the four-switch four-diode bridge circuit 20, so as to control the output voltage to dynamically fluctuate along the first voltage curve and the second voltage curve. The output voltage is the voltage of the AC power output by the four-switch four-diode bridge circuit 20, and the first voltage curve is higher than the second voltage curve.

[0055] The control device for the DC-AC converter provided in this application embodiment controls the on / off state of the switching devices in the dual-switch dual-diode bridge circuit 10 through a first control unit 601, thereby controlling the dynamic fluctuation of the inductor current along a first current curve and a second current curve. The inductor current is the current flowing through the first inductor L1 and the second inductor L2, and the first current curve is higher than the second current curve. The second control unit 602 controls the on / off state of the switching devices in the four-switch four-diode bridge circuit 20, thereby controlling the dynamic fluctuation of the output voltage along a first voltage curve and a second voltage curve. The output voltage is the AC voltage output by the four-switch four-diode bridge circuit 20, and the first voltage curve is higher than the second voltage curve. This solves the problem that current DC-AC converters do not meet the high dynamic range and high bandwidth requirements for hybrid power amplifier power supply. By cascading the dual-switch dual-diode bridge circuit and the four-switch four-diode bridge circuit, high dynamic control of the inductor current is achieved through the dual-switch dual-diode bridge circuit, thereby achieving high dynamic control of the output current. The high dynamic control of the output voltage is achieved through the four-switch four-diode bridge circuit, thus achieving the effect of outputting high dynamic range and high bandwidth AC power.

[0056] Optionally, in the control device of the DC-AC converter provided in the embodiments of this application, the first control unit includes: a first control subunit, used to control the first switching device Q1 and the second switching device Q2 in the dual-switch dual-diode bridge circuit 10 to conduct when the inductor current is lower than the first current curve, until the inductor current is higher than the first current curve; and a second control subunit, used to maintain the conduction state of the second switching device Q2, control the first switching device Q1 to be turned off when the inductor current is higher than the first current curve, and detect the inductor current, and control the first switching device Q1 and the second switching device Q2 to be turned off when the inductor current is still higher than the first current curve, until the inductor current is lower than the second current curve.

[0057] Optionally, in the control device of the DC-AC converter provided in the embodiments of this application, the second control unit includes: a third control subunit, used to control the third switch device Q3 and the sixth switch device Q6 in the four-switch four-diode bridge circuit 20 to conduct when the output voltage is lower than the first voltage curve, until the output voltage is higher than the first voltage curve; a fourth control subunit, used to control the fourth switch device Q4 and the sixth switch device Q6 in the four-switch four-diode bridge circuit 20 to conduct when the output voltage is higher than the first voltage curve, and detect the output voltage, and maintain the conduction state of the fourth switch device Q4 when the output voltage is still higher than the first voltage curve, and control the fifth switch device Q5 in the four-switch four-diode bridge circuit 20 to conduct until the output voltage is lower than the second voltage curve; a fifth control subunit, used to control the fourth switch device Q4 and the sixth switch device Q6 to conduct when the output voltage is lower than the second voltage curve, and detect the output voltage, and maintain the conduction state of the sixth switch device Q6 when the output voltage is still lower than the second voltage curve, and control the third switch device to conduct until the output voltage is higher than the first voltage curve.

[0058] The control device of the aforementioned DC-AC converter includes a processor and a memory. The first control unit 601 and the second control unit 602 are both stored as program units in the memory, and the processor executes the program units stored in the memory to realize the corresponding functions.

[0059] The processor contains a core, which retrieves the corresponding program unit from memory. One or more cores can be configured, and by adjusting the core parameters, the DC-AC converter can output high-dynamic, high-bandwidth AC power.

[0060] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0061] This application also provides an electronic device. Figure 7 This is a schematic diagram of an electronic device according to an embodiment of this application. The electronic device 70 includes a processor and a memory; the memory stores computer-readable instructions, and the processor is used to execute the computer-readable instructions, wherein the computer-readable instructions execute a control method for a DC-AC converter. The electronic device in this document may be a server, PC, PAD, mobile phone, etc.

[0062] This application also provides a computer program product, including a non-volatile computer-readable storage medium storing a computer program. When executed by a processor, the computer program has the following method steps: controlling the on / off state of the switching devices in a dual-switch dual-diode bridge circuit 10 to control the inductor current to dynamically fluctuate along a first current curve and a second current curve, wherein the inductor current is the current flowing through the first inductor L1 and the second inductor L2, and the first current curve is higher than the second current curve; controlling the on / off state of the switching devices in a four-switch four-diode bridge circuit 20 to control the output voltage to dynamically fluctuate along a first voltage curve and a second voltage curve, wherein the output voltage is the voltage of the AC power output by the four-switch four-diode bridge circuit 20, and the first voltage curve is higher than the second voltage curve.

[0063] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0064] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0065] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0066] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0067] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0068] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0069] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0070] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0071] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A DC-AC converter, characterized in that, include: A dual-switch dual-diode bridge circuit (10) is provided. The first and second input terminals of the dual-switch dual-diode bridge circuit (10) are used to connect the positive and negative terminals of a DC power supply. The first output terminal of the dual-switch dual-diode bridge circuit (10) is connected to the input terminal of a first inductor (L1). The second output terminal of the dual-switch dual-diode bridge circuit (10) is connected to the output terminal of a second inductor (L2). The dual-switch dual-diode bridge circuit (10) is used to regulate the current flowing through the first inductor (L1) and the second inductor (L2). A four-switch four-diode bridge circuit (20) is used to adjust the magnitude of the output AC voltage. The input terminal of the four-switch four-diode bridge circuit (20) is connected to the output terminal of the first inductor (L1), the first output terminal of the four-switch four-diode bridge circuit (20) is connected to the input terminal of the second inductor (L2), the second output terminal of the four-switch four-diode bridge circuit (20) is an AC power output terminal, and the third output terminal of the four-switch four-diode bridge circuit (20) is an AC power reference terminal. A capacitor (C1) is connected at both ends to the second and third output terminals of the four-switch four-diode bridge circuit (20), respectively. The dual-switch dual-diode bridge circuit (10) includes a first branch and a second branch connected in parallel. The first branch includes a first switching device (Q1) and a first diode (D1) connected in series. The input terminal of the first switching device (Q1) is connected to the positive terminal of the DC power supply. The output terminal of the first switching device (Q1) is connected to the cathode of the first diode (D1). The anode of the first diode (D1) is connected to the negative terminal of the DC power supply. The output terminal of the first switching device (Q1) and the cathode of the first diode (D1) are the first output terminals of the dual-switch dual-diode bridge circuit (10). The second branch includes a second switching device (Q2) and a second diode (D2) connected in series. The cathode of the second diode (D2) is connected to the positive terminal of the DC power supply, the anode of the second diode (D2) is connected to the input terminal of the second switching device (Q2), the output terminal of the second switching device (Q2) is connected to the negative terminal of the DC power supply, and the anode of the second diode (D2) and the input terminal of the second switching device (Q2) are the second output terminals of the dual-switch dual-diode bridge circuit (10). Among them, the four-switch four-diode bridge circuit (20) includes a third branch and a fourth branch connected in parallel; The third branch includes a first unidirectional switch and a second unidirectional switch connected in series. The input terminals of the first unidirectional switch and the second unidirectional switch are connected. The input terminals of the first unidirectional switch and the second unidirectional switch are the input terminals of the four-switch four-diode bridge circuit (20). The output terminal of the first unidirectional switch is the first output terminal of the four-switch four-diode bridge circuit (20). The output terminal of the second unidirectional switch is the second output terminal of the four-switch four-diode bridge circuit (20). The fourth branch includes a third unidirectional switch and a fourth unidirectional switch connected in series. The output terminals of the third unidirectional switch and the fourth unidirectional switch are connected. The output terminals of the third unidirectional switch and the fourth unidirectional switch are the first output terminals of the four-switch four-diode bridge circuit (20). The input terminal of the third unidirectional switch is the second output terminal of the four-switch four-diode bridge circuit (20). The input terminal of the fourth unidirectional switch is the third output terminal of the four-switch four-diode bridge circuit (20).

2. The DC-AC converter according to claim 1, characterized in that, The first one-way switch includes a third switching device (Q3) and a third diode (D3) connected in series. The output terminal of the third switching device (Q3) is connected to the anode of the third diode (D3). The input terminal of the third switching device (Q3) is the input terminal of the first one-way switch, and the cathode of the third diode (D3) is the output terminal of the first one-way switch. The second unidirectional switch includes a fourth switching device (Q4) and a fourth diode (D4) connected in series. The output terminal of the fourth switching device (Q4) is connected to the anode of the fourth diode (D4). The input terminal of the fourth switching device (Q4) is the input terminal of the second unidirectional switch, and the cathode of the fourth diode (D4) is the output terminal of the second unidirectional switch. The third one-way switch includes a fifth switching device (Q5) and a fifth diode (D5) connected in series. The input terminal of the fifth switching device (Q5) and the cathode of the fifth diode (D5) are connected. The output terminal of the fifth switching device (Q5) is the output terminal of the third one-way switch, and the anode of the fifth diode (D5) is the input terminal of the third one-way switch. The fourth unidirectional switch includes a sixth switching device (Q6) and a sixth diode (D6) connected in series. The input terminal of the sixth switching device (Q6) and the cathode of the sixth diode (D6) are connected. The output terminal of the sixth switching device (Q6) is the output terminal of the fourth unidirectional switch, and the cathode of the sixth diode (D6) is the input terminal of the fourth unidirectional switch.

3. A control method for a DC-AC converter, characterized in that, The DC-AC converter applied in claim 2 includes: Control the on / off state of the switching devices in the dual-switch dual-diode bridge circuit (10) to control the dynamic fluctuation of the inductor current along the first current curve and the second current curve, wherein the inductor current is the current flowing through the first inductor (L1) and the second inductor (L2), and the first current curve is higher than the second current curve. The on / off state of the switching devices in the four-switch four-diode bridge circuit (20) is controlled to control the output voltage to dynamically fluctuate along the first voltage curve and the second voltage curve, wherein the output voltage is the voltage of the AC power output by the four-switch four-diode bridge circuit (20), and the first voltage curve is higher than the second voltage curve.

4. The control method for a DC-AC converter according to claim 3, characterized in that, Controlling the on / off state of the switching devices in the dual-switch dual-diode bridge circuit (10) to control the dynamic fluctuation of the inductor current along the first current curve and the second current curve includes: When the inductor current is lower than the first current curve, the first switching device (Q1) and the second switching device (Q2) in the dual-switch dual-diode bridge circuit (10) are controlled to be turned on until the inductor current is higher than the first current curve. When the inductor current is higher than the first current curve, the second switching device (Q2) is kept on, the first switching device (Q1) is controlled to be off, and the inductor current is detected. When the inductor current is still higher than the first current curve, the first switching device (Q1) and the second switching device (Q2) are controlled to be off until the inductor current is lower than the second current curve.

5. The control method for a DC-AC converter according to claim 3, characterized in that, Controlling the on / off state of the switching devices in the four-switch, four-diode bridge circuit (20) to control the dynamic fluctuation of the output voltage along the first voltage curve and the second voltage curve includes: When the output voltage is lower than the first voltage curve, the third switch (Q3) and the sixth switch (Q6) in the four-switch four-diode bridge circuit (20) are controlled to be turned on until the output voltage is higher than the first voltage curve; When the output voltage is higher than the first voltage curve, the fourth switch (Q4) and the sixth switch (Q6) in the four-switch four-diode bridge circuit (20) are turned on, and the output voltage is detected. When the output voltage is still higher than the first voltage curve, the fourth switch (Q4) is kept on, and the fifth switch (Q5) in the four-switch four-diode bridge circuit (20) is turned on until the output voltage is lower than the second voltage curve. When the output voltage is lower than the second voltage curve, the fourth switch (Q4) and the sixth switch (Q6) are turned on, and the output voltage is detected. When the output voltage is still lower than the second voltage curve, the sixth switch (Q6) is kept on, and the third switch (Q3) is turned on, until the output voltage is higher than the first voltage curve.

6. A control device for a DC-AC converter, characterized in that, The DC-AC converter applied in claim 2 includes: The first control unit is used to control the on / off state of the switching devices in the dual-switch dual-diode bridge circuit (10) to control the inductor current to fluctuate dynamically along the first current curve and the second current curve, wherein the inductor current is the current flowing through the first inductor (L1) and the second inductor (L2), and the first current curve is higher than the second current curve. The second control unit is used to control the on / off state of the switching devices in the four-switch four-diode bridge circuit (20) to control the output voltage to fluctuate dynamically along the first voltage curve and the second voltage curve, wherein the output voltage is the voltage of the AC power output by the four-switch four-diode bridge circuit (20), and the first voltage curve is higher than the second voltage curve.

7. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to execute the control method of the DC-AC converter according to any one of claims 3 to 5 through the computer program.

8. A computer program product, characterized in that, The device includes a non-volatile computer-readable storage medium storing a computer program that, when executed by a processor, implements the control method for the DC-AC converter according to any one of claims 3 to 5.

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