Active discharge method and device, electronic equipment and storage medium

Abstract

Embodiments of the application disclose an active discharging method and device, electronic equipment and a storage medium, wherein the method comprises: obtaining a first voltage of a CLLC resonant circuit when a vehicle-mounted charger receives a discharging command; controlling a primary side loop of a transformer to be in a short circuit state when the first voltage is greater than a first threshold value; configuring a discharging loop based on a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube; and discharging based on the discharging loop. Thus, the discharging time is shortened, the cost is saved, and the safety of the discharging process is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power electronics of active discharge technology, and particularly relates to an active discharge method and device, electronic equipment and storage medium. BACKGROUND

[0002] Nowadays, people have higher and higher requirements for the safety performance of new energy vehicles working in a high-voltage environment, and the high-voltage electricity generated after a vehicle collision can also cause safety hazards. The current discharge methods are divided into two types, active discharge and passive discharge. Passive discharge generally relies on a special discharge hardware circuit to discharge, and active discharge can be actively discharged through a DC-DC converter. This active discharge method has a great impact on the switching tube, resulting in low safety. SUMMARY

[0003] The embodiments of the present application provide an active discharge method, device, electronic equipment and storage medium, which can save cost and improve the safety of the discharge process.

[0004] In a first aspect, the embodiments of the present application provide an active discharge method applied to a vehicle-mounted charger. The vehicle-mounted charger includes a CLLC resonant circuit, and the CLLC resonant circuit includes a transformer, a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, a sixth switching tube, a seventh switching tube and an eighth switching tube. The method includes the following steps.

[0005] After the vehicle-mounted charger receives a discharge command, the vehicle-mounted charger acquires a first voltage of the CLLC resonant circuit.

[0006] When the first voltage is greater than a first threshold value, the vehicle-mounted charger controls a primary side loop of the transformer to be in a short-circuit state.

[0007] The vehicle-mounted charger forms a discharge loop based on the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, the sixth switching tube, the seventh switching tube and the eighth switching tube.

[0008] The vehicle-mounted charger discharges based on the discharge loop.

[0009] In some possible implementation manners, the vehicle-mounted charger controls the primary side loop of the transformer to be in the short-circuit state, including the following steps.

[0010] When the first voltage is greater than the first threshold value, the vehicle-mounted charger turns off the first switching tube and the third switching tube, and turns on the second switching tube and the fourth switching tube.

[0011] In some possible implementation manners, the vehicle-mounted charger controls the primary side loop of the transformer to be in the short-circuit state, and further includes the following step: when the first voltage is greater than the first threshold value, the vehicle-mounted charger turns on the first switching tube and the third switching tube, and turns off the second switching tube and the fourth switching tube.

[0012] In some possible implementation manners, the on-board charger forms a discharging loop based on the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube, and the discharging loop includes:

[0013] The on-board charger turns off the fifth switch tube and the eighth switch tube, and turns on the sixth switch tube and the seventh switch tube.

[0014] The on-board charger forms a discharging loop based on the second switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube.

[0015] In some possible implementation manners, the method further includes: during the discharging process based on the discharging loop, the on-board charger acquires a resonant cavity current of the CLLC resonant circuit.

[0016] If the resonant cavity current is less than a current threshold, the on-board charger acquires a second voltage of the CLLC resonant circuit.

[0017] When the second voltage is greater than a second threshold, the on-board charger continues the discharging process.

[0018] When the second voltage is less than the second threshold, the on-board charger turns off the second switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube, and ends the discharging process.

[0019] If the resonant cavity current is greater than the current threshold, the on-board charger turns off the second switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube, and suspends the discharging process.

[0020] The on-board charger acquires a third voltage of the CLLC resonant circuit, and when the third voltage is greater than a first threshold, the on-board charger re-performs the discharging based on the discharging loop formed by the second switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube.

[0021] In some possible implementation manners, the on-board charger turning off the fifth switch tube and the eighth switch tube, and turning on the sixth switch tube and the seventh switch tube includes:

[0022] The on-board charger generates a first pulse signal and a second pulse signal.

[0023] The on-board charger generates a first driving signal according to the first pulse signal, and generates a second driving signal according to the second pulse signal.

[0024] The on-board charger turns off the first switch tube and the third switch tube, and turns on the second switch tube and the fourth switch tube according to the first driving signal.

[0025] The on-board charger turns off the fifth switch tube and the eighth switch tube, and turns on the sixth switch tube and the seventh switch tube according to the second driving signal.

[0026] In some possible implementation manners, the on-board charger turns off the second switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube, including:

[0027] The on-board charger generates a third pulse signal;

[0028] The on-board charger generates a third driving signal according to the third pulse signal;

[0029] The on-board charger turns off the second switch tube, the fourth switch tube, the sixth switch tube and the seventh switch tube according to the third driving signal.

[0030] In a second aspect, the embodiments of the present application provide an active discharge device, the active discharge device comprising a CLLC resonant circuit, the CLLC resonant circuit comprising a transformer, a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube and an eighth switch tube, and the device comprising an acquisition module and a control module;

[0031] The acquisition module is configured to acquire a first voltage of the CLLC resonant circuit after receiving a discharge command;

[0032] The control module is configured to control the primary side of the transformer to be in a short circuit state when the first voltage is greater than a first threshold value;

[0033] The first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube form a discharge loop;

[0034] Discharge is performed based on the discharge loop.

[0035] In a third aspect, the embodiments of the present application provide an active discharge circuit, the circuit comprising a CLLC resonant circuit, an isolation driving circuit and a controller;

[0036] The CLLC resonant circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, an eighth switch tube, a transformer, a current transformer, a first inductor, a second inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor;

[0037] The controller comprises an acquisition unit and a control unit;

[0038] An input end of the acquisition unit is connected with the CLLC resonant circuit, an output end of the acquisition unit is connected with an input end of the control unit, an output end of the control unit is connected with an input end of the isolation driving circuit, and an output end of the isolation driving circuit is connected with the CLLC resonant circuit;

[0039] One end of the first switch tube and one end of the second switch tube are connected with one end of the first inductor, and the other end of the first inductor and one end of the second inductor are connected with one end of the transformer primary side;

[0040] One end of the third switch tube and one end of the fourth switch tube are connected with one end of the second capacitor, and the other end of the second capacitor and the other end of the second inductor are connected with the other end of the transformer primary side;

[0041] The other end of the first switch tube is connected with the other end of the third switch tube and one end of the first capacitor, and the other end of the second switch tube is connected with the other end of the fourth switch tube and the other end of the first capacitor;

[0042] One end of the seventh switch tube and one end of the eighth switch tube are connected with one end of the current transformer, and the other end of the current transformer and one end of the third capacitor are connected, and the other end of the third capacitor is connected with one end of the transformer secondary side;

[0043] One end of the fifth switch tube and one end of the sixth switch tube are connected with the other end of the transformer secondary side;

[0044] The other end of the seventh switch tube is connected with the other end of the fifth switch tube and one end of the fourth capacitor, and the other end of the eighth switch tube is connected with the other end of the sixth switch tube and the other end of the fourth capacitor;

[0045] The other end of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube are connected with the output end of the isolation driving circuit;

[0046] The acquisition unit is configured to acquire a first voltage of the CLLC resonant circuit after receiving the discharge command;

[0047] The control unit is configured to control the transformer primary side loop to be in a short circuit state when the first voltage is greater than a first threshold value;

[0048] The first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube form a discharge loop;

[0049] Discharge is performed based on the discharge loop.

[0050] In a fourth aspect, an electronic device is provided, including: a processor, the processor being connected with a memory, the memory being configured to store a computer program, and the processor being configured to execute the computer program stored in the memory to enable the electronic device to execute the method of the first aspect.

[0051] In a fifth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program. The computer program causes a computer to execute the method in the first aspect.

[0052] In a sixth aspect, an embodiment of the present application provides a computer program product. The computer program product includes a non-transitory computer readable storage medium storing a computer program. The computer is operable to cause a computer to execute the method in the first aspect.

[0053] It can be seen that, by implementing the embodiment of the present application, no special discharge hardware circuit needs to be additionally added and designed, the high-voltage electric quantity is consumed by using the above-mentioned switch tube and line parasitic element, and the resonant cavity current generated by the current transformer of the secondary side of the transformer is controlled, thereby protecting the above-mentioned switch tube and improving safety. BRIEF DESCRIPTION OF DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0055] Figure 1 A structure schematic diagram of an active discharge circuit provided by the embodiment of the present application is shown in FIG. 1.

[0056] Figure 2 A flowchart of an active discharge method provided by the embodiment of the present application is shown in FIG. 2.

[0057] Figure 3 A flowchart of another active discharge method provided by the embodiment of the present application is shown in FIG. 3.

[0058] Figure 4 A function structure composition block diagram of an active discharge device provided by the embodiment of the present application is shown in FIG. 4.

[0059] Figure 5 A structure schematic diagram of an electronic device provided by the embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of the present application.

[0061] The terms "first", "second", "third", and "fourth" and the like in the description and in the claims of the present application and the accompanying drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. The terms "comprises", "comprising", "includes", "including" and the like are to be construed open- ended, meaning that they include the listed steps or elements, but not excluding other steps or elements. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not necessarily limited to only those steps or elements, but can include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

[0062] Reference herein to "an embodiment" means that a particular feature, structure, result or characteristic described in connection with an embodiment can be included in at least one embodiment of the application. The appearances of the phrase that an embodiment in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments. It is explicitly contemplated that embodiments described herein can be combined with other embodiments.

[0063] Reference is made to Figure 1 , Figure 1 A structure schematic diagram of an active discharge circuit provided by an embodiment of the application.

[0064] The active discharge circuit provided by the embodiment of the application comprises a CLLC resonant circuit, an isolation driving circuit and a controller, wherein:

[0065] The CLLC resonant circuit comprises a first switch tube Q1, a second switch tube Q2, a third switch tube Q3, a fourth switch tube Q4, a fifth switch tube Q5, a sixth switch tube Q6, a seventh switch tube Q7, an eighth switch tube Q8, a transformer X, a current transformer TA, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4.

[0066] The controller comprises an acquisition unit and a control unit.

[0067] The input end of the acquisition unit is connected with the CLLC resonant circuit, the output end of the acquisition unit is connected with the input end of the control unit, the output end of the control unit is connected with the input end of the isolation driving circuit, and the output end of the isolation driving circuit is connected with the CLLC resonant circuit.

[0068] One end of the first switch tube Q1 and one end of the second switch tube Q2 are both connected with one end of the first inductor L1, and the other end of the first inductor L1 and one end of the second inductor L2 are both connected with one end of the primary side of the transformer X.

[0069] One end of the third switch tube Q3 and one end of the fourth switch tube Q4 are connected with one end of the second capacitor C2, and the other end of the second capacitor C2 and the other end of the second inductor L2 are connected with the other end of the primary side of the transformer X;

[0070] The other end of the first switch tube Q1 is connected with the other end of the third switch tube Q3 and one end of the first capacitor C1, and the other end of the second switch tube Q2 is connected with the other end of the fourth switch tube Q4 and the other end of the first capacitor C1;

[0071] One end of the seventh switch tube Q7 and one end of the eighth switch tube Q8 are connected with one end of the current transformer TA, and the other end of the current transformer TA and one end of the third capacitor C3 are connected, and the other end of the third capacitor C3 is connected with one end of the secondary side of the transformer X;

[0072] One end of the fifth switch tube Q5 and one end of the sixth switch tube Q6 are connected with the other end of the secondary side of the transformer X;

[0073] The other end of the seventh switch tube Q7 is connected with the other end of the fifth switch tube Q5 and one end of the fourth capacitor C4, and the other end of the eighth switch tube Q8 is connected with the other end of the sixth switch tube Q6 and the other end of the fourth capacitor C4;

[0074] The other end of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8 are connected with the output end of the isolation driving circuit;

[0075] The acquisition unit is used for acquiring the first voltage U1 of the CLLC resonant circuit after receiving the discharge command;

[0076] The control unit is used for controlling the primary side loop of the transformer to be in a short circuit state when the first voltage U1 is greater than the first threshold value;

[0077] Based on the first switch tube Q1, the second switch tube Q2, the third switch tube Q3, the fourth switch tube Q4, the fifth switch tube Q5, the sixth switch tube Q6, the seventh switch tube Q7 and the eighth switch tube Q8, a discharge loop is formed;

[0078] Discharge is performed based on the discharge loop.

[0079] In the embodiment of the present application, the on-board charger includes a CLLC resonant circuit, a controller and an isolation driving circuit. For example, when the acquisition unit of the controller receives a discharge command, the first voltage U1 of the CLLC resonant circuit is acquired; when the first voltage U1 is greater than a first threshold, the control unit of the controller generates a first pulse signal and a second pulse signal; the isolation driving circuit generates a first driving signal and a second driving signal according to the first pulse signal and the second pulse signal, respectively, and according to the first driving signal, the first switch tube Q1 and the third switch tube Q3 are turned off, and the second switch tube Q2 and the fourth switch tube Q4 are turned on; according to the second driving signal, the fifth switch tube Q5 and the eighth switch tube Q8 are turned off, and the sixth switch tube Q6 and the seventh switch tube Q7 are turned on, forming a discharge circuit and discharging. In order to facilitate the distinction, the discharge circuit formed by the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6 and the seventh switch tube Q7 in the present application is called the first discharge circuit.

[0080] Alternatively, according to the first driving signal, the first switch tube Q1 and the third switch tube Q3 are turned on, and the second switch tube Q2 and the fourth switch tube Q4 are turned off; according to the second driving signal, the fifth switch tube Q5 and the eighth switch tube Q8 are turned off, and the sixth switch tube Q6 and the seventh switch tube Q7 are turned on, forming a discharge circuit and discharging. In order to facilitate the distinction, the discharge circuit formed by the first switch tube Q1, the third switch tube Q3, the sixth switch tube Q6 and the seventh switch tube Q7 in the present application is called the second discharge circuit.

[0081] Among them, according to the above first driving signal to control the transformer X primary side switch tube when turned on or turned off, select to turn off the first switch tube Q1 and the third switch tube Q3, and turn on the second switch tube Q2 and the fourth switch tube Q4; or, select to turn on the first switch tube and the third switch tube, turn off the second switch tube and the fourth switch tube; the above two ways do not need to adopt the bridge arm through, so that the transformer X primary side loop is short-circuited, which can ensure the safety of the first capacitor C1, shorten the discharge time and enhance the safety of the discharge process.

[0082] Alternatively, according to the first driving signal, the first switch tube Q1 and the third switch tube Q3 are turned off, and the second switch tube Q2 and the fourth switch tube Q4 are turned on; according to the second driving signal, the fifth switch tube Q5 and the eighth switch tube Q8 are turned on, and the sixth switch tube Q6 and the seventh switch tube Q7 are turned off, forming a discharge circuit and discharging. In order to facilitate the distinction, the discharge circuit formed by the second switch tube Q2, the fourth switch tube Q4, the fifth switch tube Q5 and the eighth switch tube Q8 in the present application is called the third discharge circuit.

[0083] Optionally, according to the first driving signal, the first switch tube Q1 and the third switch tube Q3 are turned on, and the second switch tube Q2 and the fourth switch tube Q4 are turned off; according to the second driving signal, the fifth switch tube Q5 and the eighth switch tube Q8 are turned on, and the sixth switch tube Q6 and the seventh switch tube Q7 are turned off, to form a discharge circuit and discharge. In order to distinguish, the discharge circuit formed by the first switch tube Q1, the third switch tube Q3, the fifth switch tube Q5 and the eighth switch tube Q8 is called the fourth discharge circuit in this application.

[0084] Referring to Figure 2 , Figure 2 A flowchart of an active discharge method provided by an embodiment of the application. The method is applied to a vehicle charger, and the vehicle charger includes the CLLC resonant circuit. The method includes the following steps.

[0085] 201: When the vehicle charger receives a discharge command, the vehicle charger obtains a first voltage of the CLLC resonant circuit.

[0086] For example, when the voltage needs to be released after the car collision, the master control chip of the vehicle charger issues an active discharge command to the controller of the vehicle charger, and the controller obtains the first voltage U1 of the CLLC resonant circuit based on the active discharge command. The first voltage U1 is the high voltage to be released after the car collision.

[0087] 202: When the first voltage is greater than a first threshold value, the vehicle charger controls the primary side circuit of the transformer to be in a short circuit state.

[0088] For example, when it is detected that the first voltage U1 is greater than the first threshold value, which can be 60V, the vehicle charger turns off the first switch tube Q1 and the third switch tube Q3, and turns on the second switch tube Q2 and the fourth switch tube Q4, to control the primary side circuit of the transformer to be in a short circuit state. Optionally, when it is detected that the first voltage U1 is greater than the first threshold value, which can be 60V, the vehicle charger turns on the first switch tube Q1 and the third switch tube Q3, and turns off the second switch tube Q2 and the fourth switch tube Q4, to control the primary side circuit of the transformer to be in a short circuit state.

[0089] 203: The vehicle charger forms a discharge circuit based on the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, the sixth switch tube, the seventh switch tube and the eighth switch tube.

[0090] Exemplarily, after the first switch tube Q1 and the third switch tube Q3 are closed and the second switch tube Q2 and the fourth switch tube Q4 are turned on, the fifth switch tube Q5 and the eighth switch tube Q8 are closed and the sixth switch tube Q6 and the seventh switch tube Q7 are turned on, the on-board charger forms the first discharge circuit based on the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6, and the seventh switch tube Q7. Optionally, the formed discharge circuit further includes the second discharge circuit, the third discharge circuit, and the fourth discharge circuit, which will not be described herein again.

[0091] Exemplarily, when the first voltage U1 is detected to be greater than the first threshold value, the on-board charger generates a first pulse signal, generates a first driving signal based on the first pulse signal, and closes the first switch tube Q1 and the third switch tube Q3 and turns on the second switch tube Q2 and the fourth switch tube Q4 based on the first driving signal.

[0092] The on-board charger further generates a second pulse signal, generates a second driving signal based on the second pulse signal, and closes the fifth switch tube Q5 and the eighth switch tube Q8 and turns on the sixth switch tube Q6 and the seventh switch tube Q7 based on the second driving signal.

[0093] 204: The on-board charger discharges based on the discharge circuit.

[0094] Exemplarily, when the first discharge circuit is formed based on the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6, the seventh switch tube Q7, and the high voltage to be released, the transformer X, the current transformer TA, the second capacitor C2, and the second inductor L2, the high-voltage electric quantity of the high voltage to be released is gradually consumed through the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6, the seventh switch tube Q7, and the line parasitic element Z.

[0095] Referring to Figure 3 , Figure 3 A flowchart of another active discharge method provided by the embodiment of the application.

[0096] The method is applied to an on-board charger, and the on-board charger includes the CLLC resonant circuit. The method includes the following steps.

[0097] 301: When the on-board charger receives a discharge command, the on-board charger acquires a first voltage of the CLLC resonant circuit.

[0098] 302: When the first voltage is greater than a first threshold value, the on-board charger controls a primary side circuit of the transformer to be in a short-circuit state.

[0099] 303: The on-board charger forms a discharge circuit based on a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth switch tube, a seventh switch tube, and an eighth switch tube.

[0100] 304: The on-board charger discharges based on the discharging loop.

[0101] Optionally, the functions of steps 301, 302, 303, and 304 can correspond to the functions of steps 201, 202, 203, and 204, respectively, which will not be described here again.

[0102] 305: During the discharging process based on the discharging loop, the on-board charger obtains the resonant cavity current of the CLLC resonant circuit.

[0103] 306: If the resonant cavity current is less than the current threshold, the on-board charger obtains the second voltage of the CLLC resonant circuit.

[0104] For example, when the resonant cavity current is less than the current threshold, the current threshold can be 80A, and the on-board charger obtains the second voltage U2 of the discharging loop, where the second voltage U2 is the voltage after the first discharging loop discharges.

[0105] 307: When the second voltage is greater than the second threshold, the on-board charger continues the discharging process; when the second voltage is less than the second threshold, the on-board charger closes the second switch tube, the fourth switch tube, the sixth switch tube, and the seventh switch tube, and ends the discharging process.

[0106] For example, when the second voltage U2 is less than the second threshold, the second threshold can be 55V, the on-board charger generates a third pulse signal, generates a third driving signal according to the third pulse signal, and closes the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6, and the seventh switch tube Q7 according to the third driving signal.

[0107] For example, the first threshold can be 60V, and the second threshold can be 55V. The voltage detected at the first time is 59V, and the voltage detected at the second time is 61V. The voltage values detected at different times fluctuate. When the first threshold and the second threshold have a difference interval, the difference interval can be [5V, 10V], which can ensure that the output voltage is closed when it reaches a safety value, and the safety value can be less than or equal to the second threshold.

[0108] 308: If the resonant cavity current is greater than the current threshold, the on-board charger closes the second switch tube, the fourth switch tube, the sixth switch tube, and the seventh switch tube, and suspends the discharging process.

[0109] For example, when the resonant cavity current is greater than the current threshold, to ensure the safety of discharging, the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6, and the seventh switch tube Q7 are closed, and the discharging process is suspended.

[0110] 309: The on-board charger obtains a third voltage of the CLLC resonant circuit, and when the third voltage is greater than a first threshold value, the on-board charger re-discharges based on a discharge loop.

[0111] For example, the on-board charger obtains a third voltage U3 of the CLLC resonant circuit, and when the third voltage U3 is greater than a first threshold value, the on-board charger re-discharges based on a first discharge loop.

[0112] Referring to Figure 4 , Figure 4 A functional structure block diagram of an active discharge device provided by an embodiment of the present application is shown in FIG. 4. As shown in FIG. 4, the discharge device 400 is applied to an on-board charger, and the on-board charger includes the CLLC resonant circuit described above. The discharge device 400 includes an obtaining module 401 and a control module 402. The obtaining module 401 is configured to obtain a first voltage U1 of the CLLC resonant circuit after receiving a discharge command. The control module 402 is configured to control a primary side loop of a transformer to be in a short-circuit state when the first voltage U1 is greater than a first threshold value. Figure 4

[0113] The obtaining module 401 is configured to obtain a first voltage U1 of the CLLC resonant circuit after receiving a discharge command.

[0114] The control module 402 is configured to control a primary side loop of a transformer to be in a short-circuit state when the first voltage U1 is greater than a first threshold value.

[0115] Based on a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, and an eighth switch Q8, a discharge loop is formed.

[0116] Discharge is performed based on the discharge loop.

[0117] Specifically, the control module 402 is configured to, when the first voltage U1 is greater than the first threshold value, turn off the first switch Q1 and the third switch Q3, turn on the second switch Q2 and the fourth switch Q4, turn off the fifth switch Q5 and the eighth switch Q8, and turn on the sixth switch Q6 and the seventh switch Q7, so as to perform discharge based on a first discharge loop formed by the second switch Q2, the fourth switch Q4, the sixth switch Q6, and the seventh switch Q7.

[0118] Optionally, the control module 402 is further configured to, when the first voltage U1 is greater than the first threshold value, turn on the first switch Q1 and the third switch Q3, turn off the second switch Q2 and the fourth switch Q4, turn off the fifth switch Q5 and the eighth switch Q8, and turn on the sixth switch Q6 and the seventh switch Q7, so as to perform discharge based on a second discharge loop formed by the first switch Q1, the third switch Q3, the sixth switch Q6, and the seventh switch Q7.

[0119] ​Specifically, when the first voltage U1 is greater than the first threshold value, the control module 402 sends the first pulse signal and the second pulse signal, generates the first driving signal and the second driving signal according to the first pulse signal and the second pulse signal, turns off the first switch tube Q1 and the third switch tube Q3 according to the first driving signal, turns on the second switch tube Q2 and the fourth switch tube Q4, turns off the fifth switch tube Q5 and the eighth switch tube Q8 according to the second driving signal, and turns on the sixth switch tube Q6 and the seventh switch tube Q7.

[0120] Optionally, the sixth switch tube Q6 and the seventh switch tube Q7 are turned off and the fifth switch tube Q5 and the eighth switch tube Q8 are turned on according to the second driving signal.

[0121] Exemplarily, in the discharging process based on the first discharging circuit, the acquisition module 401 is further configured to acquire the resonant cavity current of the CLLC resonant circuit.

[0122] The acquisition module 401 is further configured to acquire the second voltage U2 of the CLLC resonant circuit when the resonant cavity current is less than the current threshold value.

[0123] The control module 402 is further configured to control the first discharging circuit to continue discharging when the second voltage U2 is greater than the second threshold value.

[0124] The control module 402 is further configured to turn off the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6 and the seventh switch tube Q7 when the second voltage U2 is less than the second threshold value.

[0125] The control module 402 is further configured to turn off the second switch tube Q2, the fourth switch tube Q4, the sixth switch tube Q6 and the seventh switch tube Q7 when the resonant cavity current is greater than the current threshold value.

[0126] The acquisition module 401 is further configured to acquire the third voltage U3 of the CLLC resonant circuit.

[0127] The control module 402 is further configured to control the first discharging circuit to discharge again when the third voltage U3 is greater than the first threshold value.

[0128] Referring to Figure 5 , Figure 5 A structural schematic diagram of an electronic device is provided in the embodiments of the present application. As shown in the figure, Figure 5 The electronic device 500 includes a transceiver 501, a processor 502 and a memory 503. They are connected through a bus 504. The memory 503 is used to store computer programs and data, and can transmit the data stored in the memory 503 to the processor 502.

[0129] The processor 502 is used to read the computer program in the memory 503 to perform the following operations:

[0130] When receiving the discharge command, a first voltage U1 of the CLLC resonant circuit is acquired;

[0131] When the first voltage U1 is greater than a first threshold, the primary side loop of the transformer is controlled to be in a short circuit state;

[0132] Based on the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5, the sixth switch Q6, the seventh switch Q7 and the eighth switch Q8, a discharge loop is formed;

[0133] Discharge is performed based on the discharge loop.

[0134] Optionally, the specific implementation function of the processor can refer to the functions of steps 201, 202, 203 and 204 described above, and will not be described in detail.

[0135] The embodiment of the application further provides a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement part or all steps of any one of the active discharge methods described in the above method embodiments.

[0136] The embodiment of the application further provides a computer program product, which includes a non-transitory computer readable storage medium storing a computer program. The computer program is operable to cause a computer to perform part or all steps of any one of the active discharge methods described in the above method embodiments.

[0137] It should be noted that, for the above-mentioned method embodiments, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the application is not limited to the action sequence described, because according to the application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required by the application.

[0138] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0139] In several embodiments provided in the present application, it should be understood that the disclosed apparatus can be implemented in other manners. For example, the division of the apparatus embodiments described above is merely illustrative, and the division of units can be different, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0140] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they can be located in one place or distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0141] In addition, the functional units in each embodiment of the present application can be integrated into a processing unit, or each unit can be physically present separately, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or in the form of a software program module.

[0142] If the integrated unit is realized in the form of a software program module and sold or used as an independent product, it can be stored in a computer readable memory. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the technical solutions or all or part of the technical solutions can be embodied in the form of a software product, which is stored in a memory and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the embodiments of the present application. The aforementioned memory includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0143] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by a program instructing relevant hardware, and the program can be stored in a computer readable memory, which can include a flash disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, etc.

[0144] The above has carried out the detailed introduction to the embodiment of the application, the principle and implementation mode of the application are described by applying specific examples in this paper, the above embodiment is only used to help understanding the method of the application and its core idea; at the same time, for the general technical personnel in the art, according to the idea of the application, the specific implementation mode and application range will have changes, and the above, the content of the specification should not be understood as the limitation of the application.

Claims

1. An active discharge method applied to an on-board charger, the on-board charger including a CLLC resonant circuit, the CLLC resonant circuit including a transformer, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a fifth switch transistor, a sixth switch transistor, a seventh switch transistor, and an eighth switch transistor; One end of the first switching transistor and one end of the second switching transistor are both connected to one end of the first inductor, and the other end of the first inductor and one end of the second inductor are both connected to one end of the primary side of the transformer. One end of the third switch and one end of the fourth switch are both connected to one end of the second capacitor, and the other end of the second capacitor and the other end of the second inductor are both connected to the other end of the primary side of the transformer. The other end of the first switch is connected to the other end of the third switch and one end of the first capacitor, and the other end of the second switch is connected to the other end of the fourth switch and the other end of the first capacitor. One end of the seventh switch and one end of the eighth switch are both connected to one end of the current transformer. The other end of the current transformer is connected to one end of the third capacitor. The other end of the third capacitor is connected to one end of the secondary side of the transformer. One end of the fifth switch and one end of the sixth switch are both connected to the other end of the transformer secondary side; The other end of the seventh switch is connected to the other end of the fifth switch and one end of the fourth capacitor; the other end of the eighth switch is connected to the other end of the sixth switch and the other end of the fourth capacitor. The method is characterized by comprising: When the on-board charger receives a discharge command, the on-board charger acquires the first voltage of the CLLC resonant circuit; When the first voltage is greater than the first threshold, the on-board charger controls the primary circuit of the transformer to be in a short-circuit state; The on-board charger forms a discharge circuit based on the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch. Specifically, it includes: turning off the fifth switch and the eighth switch, and turning on the sixth switch and the seventh switch; the discharge circuit is formed based on the second switch, the fourth switch, the sixth switch, and the seventh switch. The on-board charger discharges based on the discharge circuit.

2. The method according to claim 1, characterized in that, The on-board charger controls the primary circuit of the transformer to be in a short-circuit state, including: When the first voltage is greater than the first threshold, the on-board charger turns off the first and third switching transistors and turns on the second and fourth switching transistors.

3. The method according to claim 1, characterized in that, The on-board charger controls the primary circuit of the transformer to be in a short-circuit state, and also includes: When the first voltage is greater than the first threshold, the on-board charger turns on the first and third switching transistors and turns off the second and fourth switching transistors.

4. The method according to any one of claims 1-3, characterized in that, The method further includes: During the discharge process based on the discharge circuit, the on-board charger acquires the resonant cavity current of the CLLC resonant circuit; If the resonant cavity current is less than the current threshold, the on-board charger obtains the second voltage of the CLLC resonant circuit; When the second voltage is greater than the second threshold, the on-board charger continues the discharge process; When the second voltage is less than the second threshold, the on-board charger shuts down the second switch, the fourth switch, the sixth switch, and the seventh switch, ending the discharge process; If the resonant cavity current is greater than the current threshold, the on-board charger shuts down the second switch, the fourth switch, the sixth switch, and the seventh switch, pausing the discharge process; The on-board charger acquires a third voltage from the CLLC resonant circuit. When the third voltage is greater than the first threshold, the on-board charger re-discharges based on the discharge circuit formed by the second switch, the fourth switch, the sixth switch, and the seventh switch.

5. The method according to any one of claims 1-3, characterized in that... The on-board charger shuts off the fifth and eighth switching transistors and turns on the sixth and seventh switching transistors, including: The on-board charger generates a first pulse signal and a second pulse signal; The on-board charger generates a first drive signal based on the first pulse signal and a second drive signal based on the second pulse signal; The on-board charger turns off the first switch and the third switch and turns on the second switch and the fourth switch according to the first drive signal; The on-board charger shuts down the fifth and eighth switches and turns on the sixth and seventh switches according to the second drive signal.

6. The method according to claim 4, characterized in that, The on-board charger shuts down the second switch, the fourth switch, the sixth switch, and the seventh switch, including: The on-board charger generates a third pulse signal; The on-board charger generates a third drive signal based on the third pulse signal; The on-board charger shuts down the second switch, the fourth switch, the sixth switch, and the seventh switch according to the third drive signal.

7. An active discharge device, the active discharge device comprising a CLLC resonant circuit, the CLLC resonant circuit comprising a transformer, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a fifth switch transistor, a sixth switch transistor, a seventh switch transistor, and an eighth switch transistor; One end of the first switching transistor and one end of the second switching transistor are both connected to one end of the first inductor, and the other end of the first inductor and one end of the second inductor are both connected to one end of the primary side of the transformer. One end of the third switch and one end of the fourth switch are both connected to one end of the second capacitor, and the other end of the second capacitor and the other end of the second inductor are both connected to the other end of the primary side of the transformer. The other end of the first switch is connected to the other end of the third switch and one end of the first capacitor, and the other end of the second switch is connected to the other end of the fourth switch and the other end of the first capacitor. One end of the seventh switch and one end of the eighth switch are both connected to one end of the current transformer. The other end of the current transformer is connected to one end of the third capacitor. The other end of the third capacitor is connected to one end of the secondary side of the transformer. One end of the fifth switch and one end of the sixth switch are both connected to the other end of the transformer secondary side; The other end of the seventh switch is connected to the other end of the fifth switch and one end of the fourth capacitor; the other end of the eighth switch is connected to the other end of the sixth switch and the other end of the fourth capacitor. The device is characterized in that it comprises: an acquisition module and a control module; The acquisition module is used to acquire the first voltage of the CLLC resonant circuit after receiving a discharge command; The control module is used to control the primary circuit of the transformer to be in a short-circuit state when the first voltage is greater than the first threshold. A discharge circuit is formed based on the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, and the eighth switch, specifically including: turning off the fifth switch and the eighth switch, and turning on the sixth switch and the seventh switch; the discharge circuit is formed based on the second switch, the fourth switch, the sixth switch, and the seventh switch. Discharge is performed based on the aforementioned discharge circuit.

8. An electronic device, characterized in that, include: A processor and a memory, the processor being connected to the memory, the memory being used to store a computer program, and the processor being used to execute the computer program stored in the memory to cause the electronic device to perform the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that is executed by a processor to implement the method as described in any one of claims 1-6.

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