Capacitor discharge control method, device, equipment and storage medium

Abstract

The present application provides a capacitor discharge control method, device, equipment and storage medium. The method obtains the voltage of a first capacitor and the voltage of a second capacitor respectively to obtain the first voltage and the second voltage; determines the average duty cycle of an electric drive boost charging circuit according to the first voltage and the second voltage; determines the duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit; performs capacitor discharge on the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value, realizes simultaneous discharge of the first capacitor and the second capacitor, ensures the discharge speed, and controls the current smoothly, reduces the current impact, reduces the cost without adding additional equipment, and improves the safety of the electric drive boost charging circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicles, and in particular to a capacitor discharge control method, device, equipment and storage medium. Background Art

[0002] The emergence of new energy vehicles indicates that development is becoming more and more modern, and also reflects that technology is becoming more and more advanced. New energy vehicles are an important part of the low-carbon economy. While alleviating the contradiction between energy supply and demand, they will also promote the sustainable development of the economy. With the development of the new energy vehicle industry, DC fast charging technology is becoming increasingly important and has become the main factor for users to consider when choosing new energy vehicles. For this reason, the industry has seen the emergence of electric drive boost charging technology, which can increase the voltage of 500V charging piles to charge high-voltage models, and improve the compatibility of new energy vehicles with high and low voltage charging piles. To ensure the safety of the use point, after the boost is completed, the capacitor in the circuit needs to be discharged.

[0003] At present, there are usually two capacitors C1 and C2 in the electric drive boost charging circuit. The capacitors C1 and C2 need to be discharged. The existing technology usually adopts two discharge methods: resistance and motor. The resistance discharge method realizes discharge by adding discharge resistance to the capacitor and controlling the switch, and the motor discharge method can realize the discharge of one of the capacitors in the circuit.

[0004] However, in the prior art, the resistor discharge method requires the addition of additional equipment, resulting in a large circuit size and high cost, while the motor discharge method cannot achieve simultaneous discharge of two capacitors in the circuit, resulting in an overcurrent risk in the circuit. Summary of the invention

[0005] The present application provides a capacitor discharge control method, device, equipment and storage medium, thereby solving the technical problems in the prior art that the resistor discharge method requires the addition of additional equipment, resulting in a large circuit size and high cost, while the motor discharge method cannot achieve simultaneous discharge of two capacitors in the circuit, resulting in an overcurrent risk in the circuit.

[0006] In a first aspect, the present application provides a capacitor discharge control method, which is applied to an electric drive boost charging circuit, wherein the electric drive boost charging circuit includes a first capacitor, a second capacitor, and a controller, and the method is applied to the controller, including:

[0007] Respectively acquiring a voltage of the first capacitor and a voltage of the second capacitor to obtain a first voltage and a second voltage;

[0008] determining an average duty cycle of the electric drive boost charging circuit according to the first voltage and the second voltage;

[0009] Determine a duty cycle adjustment value for discharging the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust a B-phase duty cycle and a C-phase duty cycle in the electric drive boost charging circuit;

[0010] The first capacitor and the second capacitor are discharged according to the average duty cycle and the duty cycle adjustment value.

[0011] Here, the present application is applied to an electric drive boost charging circuit including two capacitors, and provides a control method for simultaneously discharging the two capacitors in the circuit. First, the voltages of the first capacitor and the second capacitor are respectively obtained, and the average duty cycle is set according to the voltage values ​​of the two capacitors. According to the relationship between the average duty cycle and the preset current, the duty cycle adjustment value is set, thereby adjusting the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit. During the capacitor discharge process, the voltage ratio relationship between the first capacitor and the second capacitor is met, the voltage of the first capacitor and the second capacitor is maintained stable, and the first capacitor and the second capacitor are discharged simultaneously, the discharge speed is guaranteed, and the current control is stable, and the current shock is reduced. Without adding additional equipment, the cost is reduced and the safety of the electric drive boost charging circuit is improved.

[0012] Optionally, the preset current relationship is that the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit;

[0013] Correspondingly, determining the duty cycle adjustment value for discharging the first capacitor and the second capacitor according to the preset current relationship includes:

[0014] According to a preset current relationship, a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor is determined so that the magnitude of the B-phase current in the electric drive boost charging circuit and the magnitude of the C-phase current in the electric drive boost charging circuit are respectively equal to the magnitude of the preset current threshold.

[0015] Here, the present application achieves equal current of the first capacitor and the second capacitor by adjusting the duty cycle, that is, the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit, thereby accurately achieving simultaneous discharge of the first capacitor and the second capacitor, and ensuring the safety of the electric drive boost charging circuit.

[0016] Optionally, discharging the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value includes:

[0017] Determining a B-phase duty cycle and a C-phase duty cycle in the electric drive boost charging circuit according to the average duty cycle and the duty cycle adjustment value;

[0018] The first capacitor and the second capacitor are discharged according to the B-phase duty cycle and the C-phase duty cycle.

[0019] Among them, the present application can determine the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit according to the duty cycle adjustment value, thereby ensuring the voltage balance of the first capacitor and the second capacitor, and realizing the regulation and control of the BC phase current. The simultaneous discharge of the first capacitor and the second capacitor can be achieved without adding additional equipment, thereby ensuring the safety of the electric drive boost charging circuit.

[0020] Optionally, determining the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit according to the average duty cycle and the duty cycle adjustment value includes:

[0021] Determining the B-phase duty cycle according to the sum of the average duty cycle and the duty cycle adjustment value;

[0022] The C-phase duty cycle is determined according to a difference between the average duty cycle and the duty cycle adjustment value.

[0023] Here, the present application determines that the B-phase duty cycle is the sum of the average duty cycle and the duty cycle adjustment value, and the C-phase duty cycle is the difference between the average duty cycle and the duty cycle adjustment value. The average duty cycle of the BC phase is maintained at the average duty cycle determined by the first capacitor and the second capacitor, which conforms to the voltage ratio relationship between the first capacitor and the second capacitor. The simultaneous discharge of the first capacitor and the second capacitor can be achieved without adding additional equipment, thereby ensuring the safety of the electric drive boost charging circuit.

[0024] Optionally, determining an average duty cycle of the electric drive boost charging circuit according to the first voltage and the second voltage includes:

[0025] The ratio of the second voltage to the first voltage is determined as the average duty cycle of the electric drive boost charging circuit.

[0026] Here, the present application determines the ratio of the voltage value of the second capacitor to the voltage value of the first capacitor as the average duty cycle of the electric drive boost charging circuit. According to this average duty cycle, the positive and negative adjustment of the duty cycle of the BC phase can be performed to increase the BC phase current value under the premise of ensuring the average duty cycle of the BC phase.

[0027] When the voltage of the first capacitor and the second capacitor is balanced, the discharge current is adjusted to adjust the discharge speed, so as to realize the simultaneous discharge of the first capacitor and the second capacitor.

[0028] Optionally, after discharging the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value, the method further includes:

[0029] Respectively acquiring the real-time voltage of the first capacitor and the real-time voltage of the second capacitor to obtain a third voltage and a fourth voltage;

[0030] If the third voltage is less than the first voltage threshold and / or the fourth voltage is less than the second voltage threshold, the capacitor discharge of the first capacitor and the second capacitor is stopped.

[0031] Here, the present application can detect the voltage values ​​of the first capacitor and the second capacitor in real time to achieve precise control of capacitor discharge.

[0032] In a second aspect, the present application provides a capacitor discharge control device, comprising:

[0033] An acquisition module, used to respectively acquire the voltage of the first capacitor and the voltage of the second capacitor to obtain a first voltage and a second voltage;

[0034] A first determining module, determining an average duty cycle of the electric drive boost charging circuit according to the first voltage and the second voltage;

[0035] A second determination module determines a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust a B-phase duty cycle and a C-phase duty cycle in the electric drive boost charging circuit;

[0036] The first processing module discharges the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value.

[0037] Optionally, the preset current relationship is that the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit;

[0038] Accordingly, the second determining module is specifically configured to:

[0039] According to a preset current relationship, a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor is determined so that the magnitude of the B-phase current in the electric drive boost charging circuit and the magnitude of the C-phase current in the electric drive boost charging circuit are respectively equal to the magnitude of the preset current threshold.

[0040] Optionally, the first processing module is specifically configured to:

[0041] Determining a B-phase duty cycle and a C-phase duty cycle in the electric drive boost charging circuit according to the average duty cycle and the duty cycle adjustment value;

[0042] The first capacitor and the second capacitor are discharged according to the B-phase duty cycle and the C-phase duty cycle.

[0043] Optionally, the first processing module is further specifically configured to:

[0044] Determining the B-phase duty cycle according to the sum of the average duty cycle and the duty cycle adjustment value;

[0045] The C-phase duty cycle is determined according to a difference between the average duty cycle and the duty cycle adjustment value.

[0046] Optionally, the first determining module is specifically configured to:

[0047] The ratio of the second voltage to the first voltage is determined as the average duty cycle of the electric drive boost charging circuit.

[0048] Optionally, after the first processing module discharges the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value, the device further includes:

[0049] The second processing module is used to respectively obtain the real-time voltage of the first capacitor and the second capacitor to obtain a third voltage and a fourth voltage; if the third voltage is less than the first voltage threshold and / or the fourth voltage is less than the second voltage threshold, stop discharging the first capacitor and the second capacitor.

[0050] In a third aspect, the present application provides a capacitor discharge control device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the capacitor discharge control method as described in the first aspect or the optional manner of the first aspect.

[0051] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When a processor executes the computer-executable instructions, the capacitor discharge control method described in the first aspect and various possible designs of the first aspect is implemented.

[0052] In a fifth aspect, the present invention provides a computer program product, including a computer program, which, when executed by a processor, implements the capacitor discharge control method as described in the first aspect and various possible designs of the first aspect.

[0053] The present application provides a capacitor discharge control method, device, equipment and storage medium, wherein the method is applied to an electric drive boost charging circuit including two capacitors, and provides a control method that can simultaneously discharge the two capacitors in the circuit. First, the voltages of the first capacitor and the second capacitor are respectively obtained, and the average duty cycle is set according to the voltage values ​​of the two capacitors. According to the relationship between the average duty cycle and the preset current, the duty cycle adjustment value is set, thereby adjusting the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit. During the capacitor discharge process, the voltage ratio relationship between the first capacitor and the second capacitor is met, the voltage of the first capacitor and the second capacitor is maintained stable, and the first capacitor and the second capacitor are discharged simultaneously, the discharge speed is guaranteed, and the current control is stable, and the current impact is reduced. Without adding additional equipment, the cost is reduced and the safety of the electric drive boost charging circuit is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0055] Figure 1 A schematic diagram of the topological structure of an electric drive boost charging circuit provided by the prior art;

[0056] Figure 2 A schematic diagram of the architecture of a capacitor discharge control system provided in an embodiment of the present application;

[0057] Figure 3 A flow chart of a capacitor discharge control method provided in an embodiment of the present application;

[0058] Figure 4 Another capacitor discharge control system architecture schematic diagram provided by the prior art

[0059] Figure 5 A schematic diagram of the structure of a capacitor discharge control device provided in an embodiment of the present application;

[0060] Figure 6 A schematic diagram of the structure of a capacitor discharge control device provided in an embodiment of the present application.

[0061] The above drawings show clear embodiments of the present disclosure, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present disclosure in any way, but to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0062] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0063] The terms "first", "second", "third", and "fourth", etc. (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0064] With the development of the new energy vehicle industry, DC fast charging technology has become increasingly important and has become a major factor for users to consider when choosing new energy vehicles. For this reason, the industry has developed electric drive boost charging technology. Electric drive boost charging technology can increase the voltage of 500V charging piles to charge high-voltage models, improving the compatibility of new energy vehicles with high and low voltage charging piles. Figure 1 A topological structure diagram of an electric drive boost charging circuit provided by the prior art, such as Figure 1 As shown, the electric drive boost charging circuit includes a charging pile 101, a first switch (K1) 102, a second switch (K2) 103, a third switch (K3) 104, a fourth switch (K4) 105, a first capacitor (C1) 106, a second capacitor (C2) 107, a motor 108, an electronic control unit 109 and a power supply 110, wherein the connection circuit of the motor 108 is respectively A phase, B phase and C phase from top to bottom, and the specific connection relationship is as follows Figure 1 As shown. Figure 1As shown, the electric drive boost charging circuit includes two capacitors, the first capacitor (C1) 106 and the second capacitor (C2) 107. After the boost is completed, the capacitors C1 and C2 need to be discharged to ensure the safety of electricity use. At present, the industry mostly uses two discharge methods, resistors and motors. Among them, the resistor discharge method realizes discharge by adding discharge resistors and control switches to the capacitors, and the motor discharge method can realize the discharge of one of the capacitors in the circuit. However, the resistor discharge requires additional discharge resistors and control switches, resulting in increased volume and cost; the current motor discharge is mainly a control method for C1, and C1 and C2 cannot be discharged at the same time; if the existing discharge method is forcibly used, due to the presence of C2, C1 and C2 will be charged to each other during the discharge process, the current will surge, and there is a risk of overcurrent.

[0065] In order to solve the above problems, the embodiments of the present application provide a capacitor discharge control method, device, equipment and storage medium, wherein the method uses a motor and an electronic control method to control the discharge of C1 and C2, obtains the voltage ratio of the two capacitors, determines the duty cycle according to the voltage ratio, and adjusts the size of the discharge current to adjust the discharge speed, which can achieve simultaneous discharge of C1 and C2, ensure the discharge speed, and the current control is stable without current shock.

[0066] Optional, Figure 2 A schematic diagram of a capacitor discharge control system architecture provided in an embodiment of the present application. Figure 1 In the above architecture, the electric drive boost charging circuit 201 and the controller 202 are included.

[0067] Among them, the electric drive boost charging circuit 201 can be Figure 1 The electric drive boost charging circuit in the schematic diagram.

[0068] It is understandable that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the architecture of the capacitor discharge control system. In other feasible implementations of the present application, the above architecture may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently, which can be determined according to the actual application scenario and is not limited here. Figure 2 The components shown may be implemented in hardware, software, or a combination of software and hardware.

[0069] In the specific implementation process, the controller 202 can realize the control of the electric drive boost charging circuit 201 by controlling the motor 108 and the electronic control unit 109, and utilizing the motor and electronic control method to control the discharge of C1 and C2. By obtaining the voltage ratio of the two capacitors, the duty cycle is determined according to the voltage ratio to adjust the size of the discharge current to adjust the discharge speed. This can realize the simultaneous discharge of C1 and C2, ensure the discharge speed, and ensure smooth current control without current shock.

[0070] The technical solution of the present application is described in detail below in conjunction with specific embodiments:

[0071] It should be understood that the device in the above capacitor discharge control system can be implemented by a control unit in the device reading instructions in a memory and executing the instructions, or can be implemented by a chip circuit.

[0072] In addition, the network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field can know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0073] The technical solution of the present application is described in detail below in conjunction with specific embodiments:

[0074] Figure 3 A flow chart of a capacitor discharge control method provided in an embodiment of the present application. The execution subject of the embodiment of the present application may be Figure 2 The specific execution subject of the controller 202 can be determined according to the actual application scenario. Figure 3 As shown, the method comprises the following steps:

[0075] S301: Acquire a voltage of a first capacitor and a voltage of a second capacitor respectively to obtain a first voltage and a second voltage.

[0076] Optionally, the embodiment of the present application can obtain the voltage of the first capacitor and the voltage of the second capacitor according to any voltage measuring device such as a voltmeter.

[0077] In a possible implementation, when measuring the voltage of the first capacitor and the voltage of the second capacitor, the switches K1 , K3 , and K4 are first opened, and then the voltages are acquired.

[0078] Optionally, here, the voltage value of the first capacitor C1 is U1, and the voltage value of the second capacitor C2 is U2.

[0079] S302: Determine an average duty cycle of the electric drive boost charging circuit according to the first voltage and the second voltage.

[0080] Optionally, the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit are determined according to the average duty cycle and the duty cycle adjustment value, including: determining the B-phase duty cycle according to the sum of the average duty cycle and the duty cycle adjustment value; determining the C-phase duty cycle according to the difference between the average duty cycle and the duty cycle adjustment value.

[0081] Optionally, determining the average duty cycle of the electric drive boost charging circuit according to the first voltage and the second voltage includes: determining a ratio of the second voltage to the first voltage as the average duty cycle of the electric drive boost charging circuit.

[0082] Here, in the embodiment of the present application, the ratio of the voltage value of the second capacitor to the voltage value of the first capacitor is determined as the average duty cycle of the electric drive boost charging circuit. According to this average duty cycle, the duty cycle of the BC phase can be adjusted positively or negatively. Under the premise of ensuring the average duty cycle of the BC phase, the BC phase current value is increased. When the voltage of the first capacitor and the second capacitor is balanced, the size of the discharge current is adjusted to adjust the discharge speed, thereby realizing simultaneous discharge of the first capacitor and the second capacitor.

[0083] Among them, the average duty cycle of the electric drive boost charging circuit can be represented by M0.

[0084] In some possible implementations, the average duty cycle of the electric drive boost charging circuit (the average duty cycle here is the duty cycle of the BC phase of the electronic control unit) M0 = U2 / U1. The A phase bridge arm is turned off, and the BC phase is turned on according to M0.

[0085] In the embodiment of the present application, the B-phase duty cycle is determined as the sum of the average duty cycle and the duty cycle adjustment value, and the C-phase duty cycle is determined as the difference between the average duty cycle and the duty cycle adjustment value. The average duty cycle of the BC phase is maintained at the average duty cycle determined by the first capacitor and the second capacitor, which conforms to the voltage ratio relationship between the first capacitor and the second capacitor.

[0086] S303: Determine a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor according to a preset current relationship.

[0087] Among them, the duty cycle adjustment value is used to adjust the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit.

[0088] Optionally, the preset current relationship is that the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit.

[0089] Correspondingly, according to the preset current relationship, the duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor is determined, including: according to the preset current relationship, the duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor is determined so that the magnitude of the B-phase current in the electric drive boost charging circuit and the magnitude of the C-phase current in the electric drive boost charging circuit are respectively equal to the magnitude of the preset current threshold.

[0090] In some possible embodiments, the duty cycle of the upper bridge of phase B is increased by M1 (here M1 is the duty cycle adjustment value), and the duty cycle of phase B is Mb=M0+M1. At the same time, the duty cycle of the upper bridge of phase C is reduced by M1, and the duty cycle of phase C is Mc=M0-M1. The average duty cycle of phase BC (Mb+MC) / 2 is maintained at M0, which conforms to the voltage ratio relationship between C1 and C2 and reduces current shock.

[0091] The B phase equivalent voltage Ub=Udc*Mb, the C phase equivalent voltage Uc=Udc*Mc, the BC phase voltage difference Ub-Uc=Udc*2*M1, and the BC phase current is established so that IB=-IC=I0. Among them, I0 is a preset current threshold value, which can be determined according to actual conditions, and the embodiment of the present application does not make specific restrictions on this.

[0092] In the above discharge process, due to the loss of IB and IC in the motor and electronic control, the energy of C1 and C2 is consumed, and the voltage begins to decrease, but the voltage ratio of C1 and C2 remains unchanged. Due to the decrease in the voltage of C1 and C2, IB and IC begin to decrease, and I0 cannot be maintained, and the discharge speed of the capacitor begins to slow down. Further increase the value of M1, that is, further increase the B phase duty cycle Mb, and further reduce the C phase duty cycle Mc, to increase the value of IB and IC to I0. In the process of C1 and C2 energy being consumed, although the voltage of C1 and C2 is decreasing, by continuously adjusting the duty cycle of the BC phase, the BC phase current IB and IC are maintained as much as possible, ensuring the discharge speed of C1 and C2. Until the voltage of C1 and C2 drops to a certain voltage, the discharge is completed, the electric drive can be turned off, K2 is disconnected, and the capacitor is discharged.

[0093] Here, the embodiment of the present application adjusts the duty cycle to achieve equal currents of the first capacitor and the second capacitor, that is, the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit, thereby accurately achieving simultaneous discharge of the first capacitor and the second capacitor. At the same time, by continuously adjusting the duty cycle of the BC phase, the BC phase currents IB and IC are maintained as much as possible, ensuring the discharge speed of C1 and C2, smoothly controlling the current, reducing current shock, and ensuring the safety of the electric drive boost charging circuit.

[0094] S304: Discharging the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value.

[0095] Optionally, the first capacitor and the second capacitor are discharged according to the average duty cycle and the duty cycle adjustment value, including: determining the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit according to the average duty cycle and the duty cycle adjustment value; and discharging the first capacitor and the second capacitor according to the B-phase duty cycle and the C-phase duty cycle.

[0096] Among them, the embodiment of the present application can determine the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit according to the duty cycle adjustment value, thereby ensuring the voltage balance of the first capacitor and the second capacitor, and realizing the regulation and control of the BC phase current. The simultaneous discharge of the first capacitor and the second capacitor can be achieved without adding additional equipment, thereby ensuring the safety of the electric drive boost charging circuit.

[0097] Optionally, after discharging the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value, it also includes: respectively acquiring the voltage of the first capacitor and the real-time voltage of the second capacitor to obtain a third voltage and a fourth voltage; if the third voltage is less than the first voltage threshold and / or the fourth voltage is less than the second voltage threshold, stopping discharging the first capacitor and the second capacitor.

[0098] Here, the embodiment of the present application can detect the voltage values ​​of the first capacitor and the second capacitor in real time to achieve precise control of capacitor discharge.

[0099] The embodiment of the present application is applied to an electric drive boost charging circuit including two capacitors, and provides a control method for simultaneously discharging the two capacitors in the circuit. First, the voltages of the first capacitor and the second capacitor are respectively obtained, and the average duty cycle is set according to the voltage values ​​of the two capacitors. According to the relationship between the average duty cycle and the preset current, the duty cycle adjustment value is set, so as to adjust the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit. During the capacitor discharging process, the voltage ratio relationship between the first capacitor and the second capacitor is met, the voltage of the first capacitor and the second capacitor is maintained stable, and the first capacitor and the second capacitor are discharged simultaneously, the discharge speed is guaranteed, and the current control is stable, and the current impact is reduced. Without adding additional equipment, the cost is reduced and the safety of the electric drive boost charging circuit is improved.

[0100] In a feasible implementation, the embodiment of the present application can also be applied to a capacitor discharge control system that directly performs charging. Accordingly, Figure 4 Another capacitor discharge control system architecture schematic diagram provided by the prior art. Figure 4 As shown, Figure 4 exist Figure 3 Based on the Figure 4 The K2 and K3 in the embodiment also include a fifth switch (K5) 401, a sixth switch (K6) 402, a seventh switch (K7) 403, an eighth switch (K8) 404 and a resistor (R1) 405. The specific connection method is as follows Figure 4 shown.

[0101] like Figure 4As shown, the high-voltage charging pile will directly charge the battery pack through K8. At this time, K8, K1, K4, and K6 are closed, and K7 is disconnected. During the charging process, the voltage of C2 is the battery voltage. After charging is completed, there are two cases: the first case is that K8, K1, K4, and K6 are disconnected, and then K7 is closed to start discharging. The discharging method is as shown in the above method. The control method of discharging C1 and C2 using the motor and electronic control is used to obtain the voltage ratio of the two capacitors, and the duty cycle is determined according to the voltage ratio to adjust the size of the discharge current to adjust the discharge speed, so that C1 and C2 can be discharged at the same time.

[0102] In the second case, K8 and K1 are disconnected, K6 and K4 are closed, and then K7 is closed for discharge. The discharge method is: the A-phase bridge arm turns off the wave, and the electronically controlled BC-phase upper bridge duty cycle M0 is the maximum value to reduce the current impact of the opening wave, and then slowly reduce M0 and the C2 voltage value to play a discharge role. After the discharge is completed, K7 is disconnected.

[0103] Figure 5 A schematic diagram of a capacitor discharge control device provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, the device of the embodiment of the present application includes an acquisition module 501, a first determination module 502, a second determination module 503 and a processing module 504. The capacitor discharge control device here can be the above-mentioned controller 202 itself, or a chip or integrated circuit that implements the function of the controller 202. It should be noted here that the division of the acquisition module 501, the first determination module 502, the second determination module 503 and the processing module 504 is only a division of logical functions, and the two can be physically integrated or independent.

[0104] The acquisition module 501 is used to respectively acquire the voltage of the first capacitor and the voltage of the second capacitor to obtain the first voltage and the second voltage;

[0105] A first determining module 502 determines an average duty cycle of the electric drive boost charging circuit according to the first voltage and the second voltage;

[0106] A second determination module 503 determines a duty cycle adjustment value for discharging the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust a B-phase duty cycle and a C-phase duty cycle in the electric drive boost charging circuit;

[0107] The first processing module 504 discharges the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value.

[0108] Optionally, the preset current relationship is that the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit;

[0109] Accordingly, the second determining module 503 is specifically configured to:

[0110] According to the preset current relationship, the duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor is determined so that the magnitude of the B-phase current in the electric drive boost charging circuit and the magnitude of the C-phase current in the electric drive boost charging circuit are respectively equal to the magnitude of the preset current threshold.

[0111] Optionally, the first processing module 504 is specifically configured to:

[0112] Determine the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit according to the average duty cycle and the duty cycle adjustment value;

[0113] The first capacitor and the second capacitor are discharged according to the B-phase duty cycle and the C-phase duty cycle.

[0114] Optionally, the first processing module 504 is further specifically configured to:

[0115] Determine the duty cycle of phase B according to the sum of the average duty cycle and the duty cycle adjustment value;

[0116] The duty cycle of phase C is determined based on the difference between the average duty cycle and the duty cycle adjustment value.

[0117] Optionally, the first determining module 502 is specifically configured to:

[0118] The ratio of the second voltage to the first voltage is determined as the average duty cycle of the electric drive boost charging circuit.

[0119] Optionally, after the first processing module 504 discharges the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value, the apparatus further includes:

[0120] The second processing module is used to respectively obtain the voltage of the first capacitor and the real-time voltage of the second capacitor to obtain a third voltage and a fourth voltage; if the third voltage is less than the first voltage threshold and / or the fourth voltage is less than the second voltage threshold, stop discharging the first capacitor and the second capacitor.

[0121] Figure 6 A schematic diagram of a capacitor discharge control device provided in an embodiment of the present application. The components, their connections and relationships, and their functions shown herein are merely examples and do not limit the implementation of the present application described and / or required herein.

[0122] like Figure 6As shown, the capacitor discharge control device includes: a processor 601 and a memory 602, each of which is connected to each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor 601 can process instructions executed in the capacitor discharge control device, including instructions for graphic information stored in or on the memory for display on an external input / output device (such as a display device coupled to the interface). In other embodiments, if necessary, multiple processors and / or multiple buses can be used with multiple memories and multiple memories. Figure 6 A processor 601 is taken as an example.

[0123] The memory 602 is a non-transient computer-readable storage medium that can be used to store non-transient software programs, non-transient computer executable programs and modules, such as program instructions / modules corresponding to the method of the capacitor discharge control device in the embodiment of the present application (for example, the attached Figure 5 The processor 601 executes various functional applications and data processing of the server by running the non-transient software programs, instructions and modules stored in the memory 602, that is, the method of the capacitor discharge control device in the above method embodiment is implemented.

[0124] The capacitor discharge control device may further include: an input device 603 and an output device 604. The processor 601, the memory 602, the input device 603 and the output device 604 may be connected via a bus or other means. Figure 6 The example of connecting through bus is taken in the following.

[0125] The input device 603 can receive input digital or character information, and generate key signal input related to user settings and function control of the capacitor discharge control device, such as a touch screen, a keypad, a mouse, or multiple mouse buttons, a trackball, a joystick and other input devices. The output device 604 can be an output device such as a display device of the capacitor discharge control device. The display device can include, but is not limited to, a liquid crystal display (LCD), a light emitting diode (LED) display and a plasma display. In some embodiments, the display device can be a touch screen.

[0126] The capacitor discharge control device of the embodiment of the present application can be used to execute the technical solutions in the above-mentioned method embodiments of the present application. Its implementation principles and technical effects are similar and will not be repeated here.

[0127] An embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement any of the above-mentioned capacitor discharge control methods.

[0128] An embodiment of the present application further provides a computer program product, including a computer program, which is used to implement any of the above capacitor discharge control methods when executed by a processor.

[0129] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0130] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0131] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0132] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A capacitor discharge control method, characterized in that: The method is applied to an electric drive boost charging circuit, the electric drive boost charging circuit includes a first capacitor, a second capacitor and a controller, and the method is applied to the controller, including: Respectively acquiring a voltage of the first capacitor and a voltage of the second capacitor to obtain a first voltage and a second voltage; Determining a ratio of the second voltage to the first voltage as an average duty cycle of the electric drive boost charging circuit; Determine a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit; the preset current relationship is that the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit; Determining the B-phase duty cycle according to the sum of the average duty cycle and the duty cycle adjustment value; Determining the C-phase duty cycle according to a difference between the average duty cycle and the duty cycle adjustment value; The first capacitor and the second capacitor are discharged according to the B-phase duty cycle and the C-phase duty cycle.

2. The method according to claim 1, characterized in that: The step of determining a duty cycle adjustment value for discharging the first capacitor and the second capacitor according to a preset current relationship includes: According to a preset current relationship, a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor is determined so that the magnitude of the B-phase current in the electric drive boost charging circuit and the magnitude of the C-phase current in the electric drive boost charging circuit are respectively equal to the magnitude of the preset current threshold.

3. The method according to any one of claims 1 to 2, characterized in that: After discharging the first capacitor and the second capacitor according to the B-phase duty cycle and the C-phase duty cycle, the method further includes: Respectively acquiring the real-time voltage of the first capacitor and the real-time voltage of the second capacitor to obtain a third voltage and a fourth voltage; If the third voltage is less than the first voltage threshold and / or the fourth voltage is less than the second voltage threshold, the capacitor discharge of the first capacitor and the second capacitor is stopped.

4. A capacitor discharge control device, characterized in that: include: An acquisition module, used to respectively acquire the voltage of the first capacitor and the voltage of the second capacitor to obtain the first voltage and the second voltage; A first determining module, determining an average duty cycle of an electric drive boost charging circuit according to the first voltage and the second voltage; A second determination module determines a duty cycle adjustment value for capacitor discharge of the first capacitor and the second capacitor according to a preset current relationship, wherein the duty cycle adjustment value is used to adjust the B-phase duty cycle and the C-phase duty cycle in the electric drive boost charging circuit; the preset current relationship is that the magnitude of the B-phase current in the electric drive boost charging circuit is equal to the magnitude of the C-phase current in the electric drive boost charging circuit; A first processing module, discharging the first capacitor and the second capacitor according to the average duty cycle and the duty cycle adjustment value; A first processing module, specifically configured to determine the B-phase duty cycle according to the sum of the average duty cycle and the duty cycle adjustment value; Determining the C-phase duty cycle according to a difference between the average duty cycle and the duty cycle adjustment value; Discharging the first capacitor and the second capacitor according to the B-phase duty cycle and the C-phase duty cycle; The first determination module is specifically configured to determine the ratio of the second voltage to the first voltage as the average duty cycle of the electric drive boost charging circuit.

5. A capacitor discharge control device, characterized in that: include: at least one processor and memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor executes the capacitor discharge control method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions. When the processor executes the computer-executable instructions, the capacitor discharge control method according to any one of claims 1 to 3 is implemented.

7. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the capacitor discharge control method according to any one of claims 1 to 3 is implemented.

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