Electric vehicle power supply system, control method and electronic equipment

Abstract

The present invention discloses a whole vehicle power supply system, a control method and an electronic device for an electric vehicle. The system includes: a transformer, a resonant inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, a filter inductor, a filter capacitor, a fifth switch tube and a sixth switch tube, wherein: one end of the primary winding of the transformer is electrically connected to the resonant inductor, and the other end of the primary winding of the transformer is electrically connected to the connection point of the first capacitor and the second capacitor; the center tap of the secondary winding is electrically connected to one end of the filter inductor, and the other end of the filter inductor is electrically connected to one end of the filter capacitor. The present invention reduces the voltage stress by half by adopting a voltage divider topology, so the pressure of the switch tube is reduced, and a low-voltage switch tube can be selected, thereby reducing the overall cost of the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-related technologies, and in particular to a whole vehicle power supply system for an electric vehicle, a control method for the whole vehicle power supply system for an electric vehicle, an electronic device, a storage medium and a computer program product. Background Art

[0002] The power system is a key system in electric vehicles. The current pure electric platform vehicle power system usually adopts a full-bridge or half-bridge topology circuit. In the full-bridge topology or half-bridge topology circuit, a large number of switching tubes are required.

[0003] Since pure electric platforms generally require high voltages above 800V, the existing vehicle power system topology circuits require the switch tubes in the circuit to withstand high voltage stress, resulting in the use of high-voltage power switch tubes. However, there are fewer high-voltage power switch tubes to choose from, resulting in excessively high vehicle costs. Summary of the invention

[0004] Based on this, it is necessary to provide an electric vehicle power system, a control method for the electric vehicle power system, an electronic device, a storage medium and a computer program product to address the technical problem that the circuit topology of the vehicle power system in the prior art needs to withstand a large voltage stress.

[0005] The present invention provides a whole vehicle power supply system for an electric vehicle, comprising: a transformer, a resonant inductor, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, a filter inductor, a filter capacitor, a fifth switch tube and a sixth switch tube, wherein:

[0006] The first electrode of the first switch tube is electrically connected to the second electrode of the second switch tube, the first electrode of the second switch tube is electrically connected to the second electrode of the fourth switch tube, the first electrode of the fourth switch tube is electrically connected to the second electrode of the third switch tube, one end of the primary winding of the transformer is electrically connected to the resonant inductor, the other end of the resonant inductor is electrically connected to the connection point of the first electrode of the second switch tube and the second electrode of the fourth switch tube, the second electrode of the first switch tube is electrically connected to the first capacitor, the second capacitor and the first electrode of the third switch tube in sequence, the other end of the primary winding of the transformer is electrically connected to the connection point of the first capacitor and the second capacitor, the first electrode of the first switch tube is also electrically connected to the third capacitor and the second electrode of the first diode respectively, the first electrode of the first diode is electrically connected to the second electrode of the second diode, and the first electrode of the second diode and the other end of the third capacitor are electrically connected to the first electrode of the fourth switch tube respectively;

[0007] One end of the secondary winding of the transformer is electrically connected to the second pole of the sixth switching tube, the other end of the secondary winding is electrically connected to the second pole of the fifth switching tube, the center tap of the secondary winding is electrically connected to one end of the filter inductor, the other end of the filter inductor is electrically connected to one end of the filter capacitor, and the other end of the filter capacitor is electrically connected to the first poles of the fifth switching tube and the sixth switching tube respectively.

[0008] The present invention provides a control method for a whole vehicle power supply system of an electric vehicle as described above, comprising:

[0009] Controlling the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to turn on or off, so as to control the electric vehicle power system to operate in multiple DC-to-AC positive half-cycle modes;

[0010] Control the opening or closing of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes.

[0011] Further, the positive half-cycle mode includes a first mode running at the beginning of the positive half-cycle, and the control of turning on or off the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC positive half-cycle modes includes:

[0012] A first mode is operated. In the first mode, the first switch tube, the fourth switch tube and the fifth switch tube are turned on, and the second switch tube, the third switch tube and the sixth switch tube are turned off.

[0013] Furthermore, the positive half-cycle mode also includes a second mode running after the first mode, and the control of turning on or off the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC positive half-cycle modes also includes:

[0014] The second mode is operated after the first mode. In the second mode, the second switch tube and the fifth switch tube are turned on, and the first switch tube, the third switch tube, the fourth switch tube and the sixth switch tube are turned off.

[0015] Further, the positive half-cycle mode also includes a third mode running after the second mode, and the control of turning on or off the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC positive half-cycle modes also includes:

[0016] The third mode is run after the second mode. In the third mode, the fifth switch tube is turned on, and the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the sixth switch tube are turned off.

[0017] Further, the negative half-cycle mode includes a fourth mode running at the beginning of the negative half-cycle, and the control of turning on or off the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes includes:

[0018] The fourth mode is operated. In the fourth mode, the second switch tube, the third switch tube and the sixth switch tube are turned on, and the first switch tube, the fourth switch tube and the fifth switch tube are turned off.

[0019] Furthermore, the negative half-cycle mode also includes a fifth mode running after the fourth mode, and the control of turning on or off the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes also includes:

[0020] The fifth mode is run after the fourth mode. In the fifth mode, the fourth switch tube and the sixth switch tube are turned on, and the first switch tube, the second switch tube, the third switch tube and the fifth switch tube are turned off.

[0021] Further, the negative half-cycle mode also includes a sixth mode running after the fifth mode, and the control of turning on or off the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes also includes:

[0022] The sixth mode is run after the fifth mode. In the sixth mode, the sixth switch tube is turned on, and the first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are turned off.

[0023] The present invention provides an electronic device, comprising:

[0024] at least one processor; and,

[0025] a memory electrically connected to at least one of the processors; wherein,

[0026] The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can execute the control method of the electric vehicle power system as described above.

[0027] The present invention provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute all steps of the control method of the whole power system of an electric vehicle as described above.

[0028] The present invention provides a computer program product, including a computer program / instruction, which implements the control method of the electric vehicle power system as described above when the computer program / instruction is executed by a processor.

[0029] The power supply system of the present invention forms a voltage-dividing topology on the primary side of the transformer by four switch tubes and two capacitors. By adopting the voltage-dividing topology, the voltage stress is reduced by half, so the pressure of the switch tube is reduced, and a low-voltage switch tube can be selected, thereby reducing the overall cost of the circuit. At the same time, the control method of the power supply system of the present invention can reduce voltage stress and loop loss, and improve the overall system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a system principle diagram of a whole vehicle power supply system for an electric vehicle of the present invention;

[0031] Figure 2 This is a working flow chart of a control method for a whole vehicle power system of an electric vehicle according to an embodiment of the present invention;

[0032] Figure 3 This is a working flow chart of a control method for a whole vehicle power system of an electric vehicle according to another embodiment of the present invention;

[0033] Figure 4 This is a schematic diagram of the current running direction of the first mode of an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the current running direction of the second mode of an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of the current running direction of the third mode of an embodiment of the present invention;

[0036] Figure 7 A schematic diagram of the current running direction of the fourth mode of an embodiment of the present invention;

[0037] Figure 8 A schematic diagram of the current running direction of the fifth mode of an embodiment of the present invention;

[0038] Fig. 9 A schematic diagram of the current running direction of the sixth mode of an embodiment of the present invention;

[0039] Fig.10 The figure is a schematic diagram of the hardware structure of an electronic device of the present invention.

[0040] Marking Description

[0041] 1. Transformer; 101. Primary winding; 102. Secondary winding; 1021. Secondary upper winding; 1022. Secondary lower winding; 2. Resonant inductor; 3. First switch tube; 4. Second switch tube; 5. Third switch tube; 6. Fourth switch tube; 7. First diode; 8. Second diode; 9. First capacitor; 10. Second capacitor; 11. Third capacitor; 12. Filter inductor; 13. Filter capacitor; 14. Fifth switch tube; 15. Sixth switch tube. DETAILED DESCRIPTION

[0042] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The same components are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the accompanying drawings, and the words "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0043] like Figure 1 The figure shows a system schematic diagram of a whole vehicle power supply system of an electric vehicle of the present invention, including: a transformer 1, a resonant inductor 2, a first switch tube 3, a second switch tube 4, a third switch tube 5, a fourth switch tube 6, a first diode 7, a second diode 8, a first capacitor 9, a second capacitor 10, a third capacitor 11, a filter inductor 12, a filter capacitor 13, a fifth switch tube 14 and a sixth switch tube 15, wherein:

[0044] The first electrode of the first switch tube 3 is electrically connected to the second electrode of the second switch tube 4, the first electrode of the second switch tube 4 is electrically connected to the second electrode of the fourth switch tube 6, the first electrode of the fourth switch tube 6 is electrically connected to the second electrode of the third switch tube 5, one end of the primary winding 101 of the transformer 1 is electrically connected to the resonant inductor 2, the other end of the resonant inductor 2 is electrically connected to the connection point of the first electrode of the second switch tube 4 and the second electrode of the fourth switch tube 6, the second electrode of the first switch tube 3 is electrically connected to the first capacitor 9, the second capacitor 10 and the first electrode of the third switch tube 5 in sequence, the other end of the primary winding 101 of the transformer 1 is electrically connected to the connection point of the first capacitor 9 and the second capacitor 10, the first electrode of the first switch tube 3 is also electrically connected to the third capacitor 11 and the second electrode of the first diode 7 respectively, the first electrode of the first diode 7 is electrically connected to the second electrode of the second diode 8, the first electrode of the second diode 8 and the other end of the third capacitor 11 are electrically connected to the first electrode of the fourth switch tube 6 respectively;

[0045] One end of the secondary winding 102 of the transformer 1 is electrically connected to the second pole of the sixth switch tube 15, the other end of the secondary winding 102 is electrically connected to the second pole of the fifth switch tube 14, the center tap of the secondary winding 102 is electrically connected to one end of the filter inductor 12, the other end of the filter inductor 12 is electrically connected to one end of the filter capacitor 13, and the other end of the filter capacitor 13 is electrically connected to the first poles of the fifth switch tube 14 and the sixth switch tube 15 respectively.

[0046] Specifically, the input terminal V in At both ends of the first capacitor 9 and the second capacitor 10, the output terminal U 0 The first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6, the first capacitor 9, and the second capacitor 10 form a primary voltage divider topology. At the same time, the primary winding 101 of the transformer 1, the resonant inductor 2, and the third capacitor 11 form a resonant circuit. The first diode 7 and the second diode 8 are used as clamping diodes. The filter inductor 12 and the filter capacitor 13 are filter circuits that filter the voltage on the secondary side.

[0047] By adopting the voltage divider topology, the voltage stress is reduced by half, so that low-voltage switch tubes can be selected. There are many low-voltage switch tubes available in the market, and the price is good, so the circuit cost can be reduced.

[0048] At the same time, the current flow direction of the primary side of the transformer 1 is controlled by controlling the opening or closing of the first switch tube 3, the second switch tube 4, the third switch tube 5 and the fourth switch tube 6, and the current direction of the secondary side of the transformer 1 is controlled by controlling the opening or closing of the fifth switch tube 14 and the sixth switch tube 15, thereby reducing loop loss and improving efficiency.

[0049] The switch tube may be a power tube or a field effect switch tube.

[0050] Preferably, the switch tube MOS tube, the first electrode of each switch tube is the source electrode, the second electrode is the drain electrode, and the third electrode is the gate electrode. The first electrode of the diode is the positive electrode, and the second electrode is the negative electrode.

[0051] Therefore, specifically, the source of the first switch tube 3 is electrically connected to the drain of the second switch tube 4, the source of the second switch tube 4 is electrically connected to the drain of the fourth switch tube 6, the source of the fourth switch tube 6 is electrically connected to the drain of the third switch tube 5, one end of the primary winding 101 of the transformer 1 is electrically connected to the resonant inductor 2, the other end of the resonant inductor 2 is electrically connected to the connection point of the source of the second switch tube 4 and the drain of the fourth switch tube 6, the drain of the first switch tube 3 is electrically connected to the first capacitor 9, the second capacitor 10 and the source of the third switch tube 5 in sequence, the other end of the primary winding 101 of the transformer 1 is electrically connected to the connection point of the first capacitor 9 and the second capacitor 10, the source of the first switch tube 3 is also electrically connected to the third capacitor 11 and the negative electrode of the first diode 7 respectively, the positive electrode of the first diode 7 is electrically connected to the negative electrode of the second diode 8, the positive electrode of the second diode 8 and the other end of the third capacitor 11 are electrically connected to the source of the fourth switch tube 6 respectively;

[0052] One end of the secondary winding 102 of the transformer 1 is electrically connected to the drain of the sixth switch tube 15, the other end of the secondary winding 102 is electrically connected to the drain of the fifth switch tube 14, the center tap of the secondary winding 102 is electrically connected to one end of the filter inductor 12, the other end of the filter inductor 12 is electrically connected to one end of the filter capacitor 13, and the other end of the filter capacitor 13 is electrically connected to the source of the fifth switch tube 14 and the sixth switch tube 15 respectively.

[0053] The power supply system of the present invention forms a voltage-dividing topology on the primary side of the transformer by four switch tubes and two capacitors. By adopting the voltage-dividing topology, the voltage stress is reduced by half, so the pressure of the switch tube is reduced, and a low-voltage switch tube can be selected, thereby reducing the overall cost of the circuit. At the same time, the control method of the power supply system of the present invention can reduce voltage stress and loop loss, and improve the overall system efficiency.

[0054] like Figure 2 The flowchart of the control method of the electric vehicle power system as described above is shown in one embodiment of the present invention, including:

[0055] Step S201, controlling the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6, the fifth switch tube 14 and the sixth switch tube 15 to turn on or off, so as to control the electric vehicle power system to operate in multiple DC-to-AC positive half-cycle modes;

[0056] Step S202, controlling the opening or closing of the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6, the fifth switch tube 14 and the sixth switch tube 15 to control the electric vehicle power system to operate in multiple DC to AC negative half-cycle modes.

[0057] Specifically, the present invention can be applied to electronic devices with processing capabilities, such as controllers of vehicles.

[0058] Specifically, the power supply system converts input direct current into output alternating current, and controls the opening or closing of the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6, the fifth switch tube 14 and the sixth switch tube 15 by executing step S201, so as to control the electric vehicle power supply system to operate in multiple DC to AC positive half-cycle modes, thereby outputting the positive half-cycle of alternating current.

[0059] After outputting a complete positive half cycle of alternating current, execute step S202 to control the opening or closing of the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6, the fifth switch tube 14 and the sixth switch tube 15, so as to control the electric vehicle power system to operate in multiple DC to AC negative half cycle modes, thereby outputting the negative half cycle of alternating current.

[0060] After the complete negative half cycle of the alternating current is output, step S201 and step S202 are performed again to continuously output the alternating current having the positive half cycle and the negative half cycle.

[0061] Specifically, the DC-to-AC positive half-cycle mode includes a first mode that operates at the beginning of the positive half-cycle, a second mode that operates after the first mode, and a third mode that operates after the second mode. The DC-to-AC negative half-cycle mode includes a fourth mode that operates at the beginning of the negative half-cycle, a fifth mode that operates after the fourth mode, and a sixth mode that operates after the fifth mode.

[0062] The control method of the power supply system of the present invention can reduce voltage stress and loop loss and improve the overall system efficiency.

[0063] like Figure 3 The figure shows a working flow chart of a control method of a whole vehicle power system of an electric vehicle in another embodiment of the present invention, comprising:

[0064] Step S301, running in the first mode, in which the first switch tube 3, the fourth switch tube 6 and the fifth switch tube 14 are turned on, and the second switch tube 4, the third switch tube 5 and the sixth switch tube 15 are turned off, and the DC-to-AC positive half-cycle mode includes the first mode running at the beginning of the positive half-cycle;

[0065] Step S302, running the second mode after the first mode, in which the second switch tube 4 and the fifth switch tube 14 are turned on, and the first switch tube 3, the third switch tube 5, the fourth switch tube 6 and the sixth switch tube 15 are turned off, and the DC-to-AC positive half-cycle mode also includes the second mode running after the first mode;

[0066] Step S303, running the third mode after the second mode. In the third mode, the fifth switch tube 14 is turned on, and the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6 and the sixth switch tube 15 are turned off. The DC-to-AC positive half-cycle mode also includes the third mode running after the second mode.

[0067] Step S304, running the fourth mode, in which the second switch tube 4, the third switch tube 5 and the sixth switch tube 15 are turned on, and the first switch tube 3, the fourth switch tube 6 and the fifth switch tube 14 are turned off. The DC-to-AC negative half-cycle mode includes the fourth mode running at the beginning of the negative half-cycle;

[0068] Step S305, running the fifth mode after the fourth mode. In the fifth mode, the fourth switch tube 6 and the sixth switch tube 15 are turned on, and the first switch tube 3, the second switch tube 4, the third switch tube 5 and the fifth switch tube 14 are turned off. The DC-to-AC negative half-cycle mode also includes the fifth mode running after the fourth mode.

[0069] Step S306, running the sixth mode after the fifth mode. In the sixth mode, turning on the sixth switch tube 15, turning off the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6 and the fifth switch tube 14. The DC-to-AC negative half-cycle mode also includes the sixth mode running after the fifth mode.

[0070] Specifically, step S301, step S302 and step S303 are sequentially executed to output a complete positive half cycle of alternating current, and then step S304, step S305 and step S306 are sequentially executed to output a complete negative half cycle of alternating current. Then, step S301 to step S306 are sequentially executed again to output a complete positive half cycle and a complete negative half cycle of alternating current.

[0071] Specifically, execute step S301 to run the first mode. In the first mode, the first switch tube 3, the fourth switch tube 6 and the fifth switch tube 14 are turned on, and the second switch tube 4, the third switch tube 5 and the sixth switch tube 15 are turned off. The DC-to-AC positive half-cycle mode includes the first mode running at the beginning of the positive half-cycle.

[0072] like Figure 4 The current i in the first mode is shown 1 Running direction. In the first mode, DC is converted into AC positive half cycle, and the current flow direction is:

[0073] Primary side: first capacitor 9 -> first switch tube 3 -> third capacitor 11 -> fourth switch tube 6 -> resonant inductor 2 -> primary side winding 101 of transformer 1 -> first capacitor 9 .

[0074] Secondary side: secondary side lower winding 1022 -> filter inductor 12 -> filter capacitor 13 -> fifth switch tube 14 -> secondary side lower winding 1022 .

[0075] The resonant inductor 2, the primary winding 101 and the third capacitor 11 resonate to generate a large current, and the loop resistance is low, thereby reducing the loop loss and improving the efficiency.

[0076] Then, after a period of time, step S302 is executed to run the second mode. In the second mode, the second switch tube 4 and the fifth switch tube 14 are turned on, and the first switch tube 3, the third switch tube 5, the fourth switch tube 6 and the sixth switch tube 15 are turned off. The DC-to-AC positive half-cycle mode also includes a second mode that runs after the first mode.

[0077] like Figure 5 The current i in the second mode is shown 1 Running direction, current direction is:

[0078] Primary side: first diode 7 -> second switch tube 4 -> resonant inductor 2 -> primary side winding 101 of transformer 1 -> first diode 7 .

[0079] Secondary side: secondary side lower winding 1022 -> filter inductor 12 -> filter capacitor 13 -> fifth switch tube 14 -> secondary side lower winding 1022 .

[0080] In the second mode, the second switch tube 4 is turned on to provide a freewheeling channel for the resonant inductor 2 and the primary winding 101. At the same time, the opening time of the second switch tube 4 can be controlled to limit the loop current. Specifically, the opening and closing time of the second switch tube 4 can be dynamically adjusted according to the load conditions.

[0081] Then, after a period of time, step S303 is executed to run the third mode after the second mode. In the third mode, the fifth switch tube 14 is turned on, and the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6 and the sixth switch tube 15 are turned off. The DC-to-AC positive half-cycle mode also includes the third mode running after the second mode.

[0082] like Figure 6 The current i in the third mode is shown 1 Running direction, current direction is:

[0083] Primary side: third capacitor 11 -> fourth switch tube 6 -> resonant inductor 2 -> primary side winding 101 of transformer 1 -> first diode 7 -> third capacitor 11 .

[0084] Secondary side: secondary side lower winding 1022 -> filter inductor 12 -> filter capacitor 13 -> fifth switch tube 14 -> secondary side lower winding 1022 .

[0085] The third mode is the positive half-cycle dead time, and the residual energy of the resonant inductor 2 and the primary winding 101 also has a freewheeling channel, thereby reducing the stress of the power tube and preventing the residual energy of the inductor from accumulating for a long time and causing overheating.

[0086] After outputting a complete positive half cycle of AC power, that is, running the third mode, execute step S304 to run the fourth mode. In the fourth mode, the second switch tube 4, the third switch tube 5 and the sixth switch tube 15 are turned on, and the first switch tube 3, the fourth switch tube 6 and the fifth switch tube 14 are turned off. The DC to AC negative half cycle mode includes the fourth mode running at the beginning of the negative half cycle.

[0087] like Figure 7 The current i of the fourth mode is shown 1 Running direction, current direction is:

[0088] Primary side: second capacitor 10 -> primary side winding 101 of transformer 1 -> resonant inductor 2 -> second switch tube 4 -> third capacitor 11 -> third switch tube 5 -> second capacitor 10 .

[0089] Secondary side: winding 1021 on the secondary side -> filter inductor 12 -> filter capacitor 13 -> sixth switch tube 15 -> winding 1021 on the secondary side.

[0090] In the fourth mode, direct current is converted into the negative half cycle of alternating current, and the primary winding 101, the resonant inductor 2 and the third capacitor 11 resonate to generate a large current with a low loop resistance, thereby reducing loop losses and improving efficiency.

[0091] Then, after a period of time, step S305 is executed to run the fifth mode after the fourth mode. In the fifth mode, the fourth switch tube 6 and the sixth switch tube 15 are turned on, and the first switch tube 3, the second switch tube 4, the third switch tube 5 and the fifth switch tube 14 are turned off. The DC-to-AC negative half-cycle mode also includes the fifth mode running after the fourth mode.

[0092] like Figure 8 The fifth mode current i is shown 1 Running direction, current direction is:

[0093] Primary side: second diode 8 -> primary side winding 101 of transformer 1 -> resonant inductor 2 -> fourth switch tube 6 -> second diode 8 .

[0094] Secondary side: winding 1021 on the secondary side -> filter inductor 12 -> filter capacitor 13 -> sixth switch tube 15 -> winding 1021 on the secondary side.

[0095] In the fifth mode, the fourth switch tube 6 is turned on to provide a freewheeling channel for the resonant inductor 2 and the primary winding 101. At the same time, the opening time of the fourth switch tube 6 can be controlled to limit the loop current. Specifically, the opening and closing time of the fourth switch tube 6 can be dynamically adjusted according to the load conditions.

[0096] Then, after a period of time, step S306 is executed to run the sixth mode after the fifth mode. In the sixth mode, the sixth switch tube 15 is turned on, and the first switch tube 3, the second switch tube 4, the third switch tube 5, the fourth switch tube 6 and the fifth switch tube 14 are turned off. The DC to AC negative half-cycle mode also includes the sixth mode running after the fifth mode.

[0097] like Fig. 9 The sixth mode current i is shown 1 Running direction, current direction is:

[0098] Primary side: third capacitor 11 -> second diode 8 -> primary winding 101 of transformer 1 -> resonant inductor 2 -> second switch tube 4 -> third capacitor 11 .

[0099] Secondary side: winding 1021 on the secondary side -> filter inductor 12 -> filter capacitor 13 -> sixth switch tube 15 -> winding 1021 on the secondary side.

[0100] The sixth mode is the negative half-cycle dead time, and the residual energy of the resonant inductor 2 and the primary winding 101 also has a freewheeling channel, thereby reducing the stress of the power tube and preventing the residual energy of the inductor from accumulating for a long time and causing overheating.

[0101] The positive half cycle of this embodiment is divided into three modes. In the first mode, direct current is converted into the positive half cycle of alternating current, generating a large current, reducing loop loss and improving efficiency. In the second mode, the second switch tube is turned on to provide a freewheeling channel for the resonant inductor and the primary winding to limit the size of the loop current. In the third mode, i.e., the positive half cycle dead time, the freewheeling channel of the resonant inductor and the primary winding is used to reduce the stress of the power tube, while preventing the accumulation of residual energy of the inductor due to long-term operation from overheating. In the fourth mode, direct current is converted into the negative half cycle of alternating current, generating a large current, reducing loop loss and improving efficiency. In the fifth mode, the fourth switch tube is turned on to provide a freewheeling channel for the resonant inductor and the primary winding to limit the size of the loop current. Finally, in the sixth mode, i.e., the negative half cycle dead time, the freewheeling channel of the resonant inductor and the primary winding is used to reduce the stress of the power tube, while preventing the accumulation of residual energy of the inductor due to long-term operation from overheating.

[0102] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0103] like Fig.10 The figure shows a hardware structure diagram of an electronic device of the present invention, including:

[0104] at least one processor 1001; and,

[0105] A memory 1002 electrically connected to at least one of the processors 1001; wherein,

[0106] The memory 1002 stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can execute the control method of the electric vehicle power system as described above.

[0107] Fig.10 A processor 1001 is taken as an example.

[0108] The electronic device may further include: an input device 1003 and a display device 1004 .

[0109] The processor 1001, the memory 1002, the input device 1003 and the display device 1004 may be electrically connected via a bus or other means, and the figure takes the electrical connection via a bus as an example.

[0110] The memory 1002 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules corresponding to the control method of the electric vehicle power system in the embodiment of the present application, for example, Figure 2 , Figure 3 The processor 1001 executes various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 1002, that is, the control method of the electric vehicle power system in the above embodiment is implemented.

[0111] The memory 1002 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the control method of the whole vehicle power system of the electric vehicle, etc. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 1002 may optionally include a memory remotely arranged relative to the processor 1001, and these remote memories may be electrically connected to a device for executing the control method of the whole vehicle power system of the electric vehicle through a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0112] The input device 1003 can receive user clicks and generate signal inputs related to user settings and function control of the control method of the electric vehicle power system. The display device 1004 can include display devices such as a display screen.

[0113] The one or more modules are stored in the memory 1002, and when being run by the one or more processors 1001, the control method of the electric vehicle power system in any of the above method embodiments is executed.

[0114] The control method of the power supply system of the present invention can reduce voltage stress and loop loss and improve the overall system efficiency.

[0115] An embodiment of the present invention provides a storage medium, which stores computer instructions. When a computer executes the computer instructions, it is used to execute all steps of the control method of the electric vehicle power system as described above.

[0116] In the context of the present disclosure, a storage medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or apparatus. The storage medium may be a machine-readable signal medium or a machine-readable storage medium. Alternatively, the storage medium may be a non-temporary computer-readable storage medium, for example, a non-temporary computer-readable storage medium may be a ROM, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0117] An embodiment of the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the control method of the whole power system of an electric vehicle as described above.

[0118] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A control method for an electric vehicle power system, characterized in that: The electric vehicle power supply system comprises: a transformer (1), a resonant inductor (2), a first switch tube (3), a second switch tube (4), a third switch tube (5), a fourth switch tube (6), a first diode (7), a second diode (8), a first capacitor (9), a second capacitor (10), a third capacitor (11), a filter inductor (12), a filter capacitor (13), a fifth switch tube (14) and a sixth switch tube (15), wherein: The first electrode of the first switch tube (3) is electrically connected to the second electrode of the second switch tube (4), the first electrode of the second switch tube (4) is electrically connected to the second electrode of the fourth switch tube (6), the first electrode of the fourth switch tube (6) is electrically connected to the second electrode of the third switch tube (5), one end of the primary winding (101) of the transformer (1) is electrically connected to the resonant inductor (2), the other end of the resonant inductor (2) is electrically connected to the connection point between the first electrode of the second switch tube (4) and the second electrode of the fourth switch tube (6), the second electrode of the first switch tube (3) is electrically connected to the first capacitor (9), the The second capacitor (10) and the first pole of the third switch tube (5) are electrically connected, the other end of the primary winding (101) of the transformer (1) is electrically connected to the connection point of the first capacitor (9) and the second capacitor (10), the first pole of the first switch tube (3) is also electrically connected to the third capacitor (11) and the second pole of the first diode (7), the first pole of the first diode (7) is electrically connected to the second pole of the second diode (8), and the first pole of the second diode (8) and the other end of the third capacitor (11) are electrically connected to the first pole of the fourth switch tube (6); One end of the secondary winding (102) of the transformer (1) is electrically connected to the second pole of the sixth switch tube (15), the other end of the secondary winding (102) is electrically connected to the second pole of the fifth switch tube (14), the center tap of the secondary winding (102) is electrically connected to one end of the filter inductor (12), the other end of the filter inductor (12) is electrically connected to one end of the filter capacitor (13), and the other end of the filter capacitor (13) is electrically connected to the first poles of the fifth switch tube (14) and the sixth switch tube (15), respectively; The method comprises: Controlling the on or off of the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15), so as to control the whole power supply system of the electric vehicle to operate in a plurality of DC-to-AC positive half-cycle modes; Controlling the on or off of the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15), so as to control the electric vehicle power system to operate in a plurality of DC-to-AC negative half-cycle modes; The positive half-cycle mode includes a first mode that operates at the beginning of the positive half-cycle, and the control of turning on or off the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15) to control the electric vehicle power supply system to operate in multiple DC-to-AC positive half-cycle modes includes: A first mode of operation is performed. In the first mode, the first switch tube (3), the fourth switch tube (6) and the fifth switch tube (14) are turned on, and the second switch tube (4), the third switch tube (5) and the sixth switch tube (15) are turned off.

2. The control method of the electric vehicle power system according to claim 1, characterized in that: The positive half-cycle mode also includes a second mode that operates after the first mode, wherein the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15) are controlled to be turned on or off so as to control the electric vehicle power system to operate in multiple DC-to-AC positive half-cycle modes, and further includes: The second mode is operated after the first mode. In the second mode, the second switch tube (4) and the fifth switch tube (14) are turned on, and the first switch tube (3), the third switch tube (5), the fourth switch tube (6) and the sixth switch tube (15) are turned off.

3. The control method of the electric vehicle power system according to claim 2, characterized in that: The positive half-cycle mode also includes a third mode that operates after the second mode, and the control of turning on or off the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15) to control the electric vehicle power supply system to operate in multiple DC-to-AC positive half-cycle modes also includes: The third mode is operated after the second mode. In the third mode, the fifth switch tube (14) is turned on, and the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6) and the sixth switch tube (15) are turned off.

4. The control method of the electric vehicle power system according to claim 1, characterized in that: The negative half-cycle mode includes a fourth mode that operates at the beginning of the negative half-cycle, and the control of turning on or off the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15) to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes includes: The fourth mode is operated. In the fourth mode, the second switch tube (4), the third switch tube (5) and the sixth switch tube (15) are turned on, and the first switch tube (3), the fourth switch tube (6) and the fifth switch tube (14) are turned off.

5. The control method of the electric vehicle power system according to claim 4, characterized in that: The negative half-cycle mode also includes a fifth mode that operates after the fourth mode, wherein the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15) are controlled to be turned on or off so as to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes, and further includes: The fifth mode is operated after the fourth mode. In the fifth mode, the fourth switch tube (6) and the sixth switch tube (15) are turned on, and the first switch tube (3), the second switch tube (4), the third switch tube (5) and the fifth switch tube (14) are turned off.

6. The control method of the electric vehicle power system according to claim 5, characterized in that: The negative half-cycle mode also includes a sixth mode that operates after the fifth mode, wherein the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6), the fifth switch tube (14) and the sixth switch tube (15) are controlled to be turned on or off so as to control the electric vehicle power system to operate in multiple DC-to-AC negative half-cycle modes, and further includes: The sixth mode is operated after the fifth mode. In the sixth mode, the sixth switch tube (15) is turned on, and the first switch tube (3), the second switch tube (4), the third switch tube (5), the fourth switch tube (6) and the fifth switch tube (14) are turned off.

7. An electronic device, characterized in that: include: at least one processor; as well as, a memory electrically connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors, and the instructions are executed by at least one of the processors so that at least one of the processors can execute the control method of the electric vehicle power system as described in any one of claims 1 to 6.

8. A storage medium, characterized in that: The storage medium stores computer instructions, and when a computer executes the computer instructions, it is used to execute all steps of the control method of the electric vehicle power system as described in any one of claims 1 to 6.

9. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instruction is executed by the processor, the control method of the electric vehicle power system as claimed in any one of claims 1 to 6 is implemented.

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