Charging control circuit and vehicle

Abstract

The utility model discloses a charging control circuit and a vehicle, and belongs to the technical field of battery charging, the circuit comprises a battery module, a driving module, a motor module, a charging module, a first switch, a second switch and a control module; the control module is respectively connected with the driving module, the first switch and the second switch; the first end of the first switch is connected with the driving module and the cathode of the charging module. The second end of the first switch is connected with the cathode of the battery module. The output end of the motor module is connected with the input end of the driving module; the second switch is connected between the motor module and the cathode of the battery module; and the control module is used for controlling the working state of the first switch and the working state of the second switch according to the magnitude relation between the voltage of the charging module and the voltage of the battery module, so that the charging control circuit is configured to be a direct current charging circuit or a voltage reduction charging circuit. High-voltage large-current full-load output of the charging pile is achieved, and the charging power of the vehicle is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging, and particularly to a charging control circuit and a vehicle. Background Art

[0002] The charging capacity of existing new energy vehicles is limited by parameters such as the battery voltage of the vehicle, the maximum allowable current of the battery, the voltage of the charging pile, and the maximum current of the charging pile. Public charging piles usually have three voltage platforms, and the highest voltages are 500V, 750V, and 1000V respectively; while the maximum charging current of public charging piles is less than or equal to 250A. When vehicles with different voltage platforms are connected, especially when vehicles with a voltage platform lower than the highest voltage of the public charging pile are connected, the public charging pile cannot exert the maximum voltage and current upper limit capabilities of the charging pile, resulting in the public charging pile not being able to output at full load and having low charging efficiency. Summary of the Utility Model

[0003] The present application provides a charging control circuit and a vehicle, which step down and step up the input of the charging pile through the vehicle end to achieve full load output of the charging pile with high voltage and large current, thereby improving the charging power of the vehicle.

[0004] The present application provides a charging control circuit, including: a battery module, a driving module, a motor module, a charging module, a first switch, a second switch, and a control module;

[0005] The control module is respectively connected to the driving module, the first switch, and the second switch;

[0006] The first output end of the driving module is respectively connected to the positive pole of the battery module and the positive pole of the charging module;

[0007] The second output end of the driving module is respectively connected to the negative pole of the charging module and the first end of the first switch, and the second end of the first switch is connected to the negative pole of the battery module;

[0008] The output end of the motor module is connected to the input end of the driving module;

[0009] The first end of the second switch is connected to the motor module, and the second end of the second switch is connected to the negative pole of the battery module;

[0010] The control module is used to control the working states of the first switch and the second switch according to the magnitude relationship between the voltage of the charging module and the voltage of the battery module, so as to configure the charging control circuit as a DC charging circuit or a step-down charging circuit.

[0011] The charging control circuit provided by this application selects a DC charging circuit or a buck charging circuit to charge the battery module according to the magnitude relationship between the input of the connected charging module, the charging module voltage, and the battery module voltage. The configured buck charging circuit of this application steps down the output of the charging module and boosts the current through the driving module and the motor module, so that the charging module can output at full load with high voltage and large current, exerting the maximum voltage and current upper limit capabilities of the charging module and improving the charging efficiency of the battery module.

[0012] Further, the driving module includes at least one bridge arm, and the bridge arm includes two connected first switching tubes and second switching tubes;

[0013] Wherein, the emitter of the first switching tube is connected to the collector of the second switching tube;

[0014] The collector of the first switching tube is connected to the first output terminal of the driving module; the emitter of the first switching tube is connected to the input terminal of the driving module;

[0015] The emitter of the second switching tube is connected to the second output terminal of the driving module; the collector of the second switching tube is connected to the input terminal of the driving module.

[0016] Further, the motor module includes at least one motor inductor;

[0017] Wherein, the first end of the motor inductor is connected between the first switching tube and the second switching tube;

[0018] The output terminal of the motor module is connected to the first end of the motor inductor;

[0019] The second end of the motor inductor is connected to the first end of the second switch.

[0020] The configured buck charging circuit of this application performs voltage division and energy storage through the motor inductor in the motor module, and increases the current output to the battery module by using the motor module and the adjustable inductor, so that the charging module can output at full load with high voltage and large current, exerting the maximum voltage and current upper limit capabilities of the charging module. In addition, the motor module can increase the charging current of the battery module during discharge, thereby improving the charging efficiency of the battery module.

[0021] Further, the control module is used to control the working states of the first switch and the second switch according to the magnitude relationship between the charging module voltage and the battery module voltage, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including:

[0022] The control module controls the first switch to close and the second switch to open according to the first magnitude relationship between the voltage of the charging module and the voltage of the battery module, so as to configure the charging control circuit as a DC charging circuit.

[0023] The charging control circuit provided by the present application closes the first switch and opens the second switch, which can configure the circuit as a DC charging circuit. Through the DC charging circuit of the present application, the charging module can directly charge the battery module with DC power.

[0024] Further, the control module is used to control the working states of the first switch and the second switch according to the magnitude relationship between the voltage of the charging module and the voltage of the battery module, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including:

[0025] The control module controls the second switch to close and the first switch to open according to the second magnitude relationship between the voltage of the charging module and the voltage of the battery module, so as to configure the charging control circuit as a buck charging circuit.

[0026] The charging control circuit provided by the present application closes the first switch and opens the second switch, which can configure the circuit as a buck charging circuit. At the same time, by controlling the on and off of the first switch tube and the second switch tube in the drive module, the present application enables the charging module to charge the battery module and the motor module. Furthermore, the present application utilizes the motor module and the adjustable inductor to increase the current output to the battery module, so that the charging module can output at full load with high voltage and large current, exerting the maximum voltage and current limit capabilities of the charging module and improving the charging efficiency of the battery module.

[0027] Further, the charging control circuit further includes: a third switch;

[0028] The first end of the third switch is connected to the second output end of the drive module, and the second end of the third switch is connected to the negative electrode of the charging module.

[0029] Further, after controlling the second switch to close and the first switch to open, it includes:

[0030] The control module controls the third switch to close according to the first preset condition, and controls the first switch tube to turn off and the second switch tube to turn on, so that the charging module charges the battery module and the motor module simultaneously.

[0031] In the buck charging circuit provided by the present application, when the third switch is controlled to be closed, the first switch tube is controlled to be turned off, and the second switch tube is controlled to be turned on, current is made to flow from the charging module, through the battery module and into the motor module, and then back to the charging module through the turned-on second switch tube, forming a buck charging loop. In the buck charging loop, the charging module charges both the battery module and the motor module simultaneously, and the motor module stores the electrical energy input by the charging module. Furthermore, the present application utilizes the motor module and the adjustable inductor to increase the current output to the battery module, achieving charging the battery module with the maximum utilization of the power of the charging module, thereby improving the charging efficiency of the battery module.

[0032] Further, after controlling the second switch to be closed and the first switch to be opened, it includes:

[0033] The control module controls the third switch to be turned off, the second switch tube to be turned off, and the first switch tube to be turned on according to a second preset condition, so that the motor module charges the battery module.

[0034] In the buck charging circuit provided by the present application, when the third switch is controlled to be turned off, the first switch tube is controlled to be turned on, and the second switch tube is controlled to be turned off, current is made to flow from the motor module, through the turned-on first switch tube and into the battery module, and then back to the motor module, forming a discharge loop. In the discharge loop, the present application utilizes the motor module and the adjustable inductor to increase the current output to the battery module, achieving buck-boost current for the output of the charging module, so that the charging module can output at full load with high voltage and large current, exerting the maximum voltage and current limit capabilities of the charging module and improving the charging efficiency of the battery module.

[0035] Further, the charging control circuit further includes: an adjustable inductor;

[0036] The first end of the adjustable inductor is connected to the second end of the second switch;

[0037] The second end of the adjustable inductor is connected to the negative pole of the battery module.

[0038] The present application improves the energy storage capacity of the charging control circuit by setting an adjustable inductor outside the motor, so that the electrical energy stored in the buck charging circuit can meet the charging requirements of the battery module, ensuring that the charging module can output at full load with high voltage and large current, and further improving the charging efficiency of the battery module.

[0039] Correspondingly, the present application further provides a vehicle, including the charging control circuit as described in the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic structural diagram of a charging control circuit provided by an embodiment of the present application;

[0041] Figure 2 is a schematic circuit diagram of a specific charging control circuit provided by an embodiment of the present application;

[0042] Figure 3 is a schematic diagram of the current direction of the DC charging circuit of a charging control circuit provided by an embodiment of the present application;

[0043] Figure 4 is a schematic diagram of the current direction of the step-down charging circuit of a charging control circuit provided by an embodiment of the present application;

[0044] Figure 5 is a schematic diagram of the current direction of the discharge circuit of a charging control circuit provided by an embodiment of the present application. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0046] Embodiment 1

[0047] Currently, public charging piles usually have three voltage platforms, and the highest voltage U of the public charging pile 桩 is 500V, 750V, and 1000V respectively, and the maximum charging current I of the public charging pile 桩 ≤250A. The charging capacity of the charging pile is P 桩 =U 桩 ×I 桩 .

[0048] However, the charging capacity of new energy vehicles is limited by the battery voltage, the maximum allowable current of the battery, the charging pile voltage, and the maximum current of the charging pile, etc. When the voltage platform of the vehicle is less than the voltage platform of the public charging pile, that is, the highest voltage of the vehicle is lower than the highest voltage of the public charging pile, then the charging capacity P of the vehicle 车 =U 车 ×I 桩 . This results in the charging pile being unable to exert its maximum voltage capacity, unable to make the charging pile output at full load, and the charging efficiency is poor.

[0049] Please refer to Figure 1 , a charging control circuit provided by an embodiment of the present application, including: battery module 101, drive module 102, motor module 103, charging module 104, first switch 105, second switch 106, and control module 107;

[0050] The control module 107 is respectively connected to the drive module 102, the first switch 105, and the second switch 106;

[0051] The output end of the motor module 103 is connected to the input end of the drive module 102;

[0052] The first output end of the drive module 102 is respectively connected to the positive electrode of the battery module 101 and the positive electrode of the charging module 104;

[0053] The second output end of the drive module 102 is respectively connected to the negative electrode of the charging module 104 and the first end of the first switch 105, and the second end of the first switch 105 is connected to the negative electrode of the battery module 101;

[0054] The first end of the second switch 106 is connected to the input end of the motor module 103, and the second end of the second switch 106 is connected to the negative electrode of the battery module 101;

[0055] The control module 107 is configured to control the working states of the first switch 105 and the second switch 106 according to the magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit.

[0056] Further, the drive module 102 includes at least one bridge arm, and the bridge arm includes two connected first switch tubes and second switch tubes;

[0057] Wherein, the emitter of the first switch tube is connected to the collector of the second switch tube;

[0058] The collector of the first switch tube is connected to the first output end of the drive module 102; the emitter of the first switch tube is connected to the input end of the drive module 102;

[0059] The emitter of the second switch tube is connected to the second output end of the drive module 102; the collector of the second switch tube is connected to the input end of the drive module 102.

[0060] Further, the motor module 103 includes at least one motor inductor;

[0061] Wherein, the first end of the motor inductor is connected between the first switch tube and the second switch tube;

[0062] The output end of the motor module is connected to the first end of the motor inductor;

[0063] The second end of the motor inductor is connected to the first end of the second switch 106.

[0064] In some preferred embodiments, the driving module 102 includes a leg, and the motor module 103 includes a motor inductor.

[0065] Wherein, the leg includes two connected first switching tubes and second switching tubes; the emitter of the first switching tube is connected to the collector of the second switching tube; the collector of the first switching tube is connected to the first output terminal of the driving module 102; the emitter of the first switching tube is connected to the input terminal of the driving module 102; the emitter of the second switching tube is connected to the second output terminal of the driving module 102; the collector of the second switching tube is connected to the input terminal of the driving module 102. The first end of the motor inductor is connected between the first switching tube and the second switching tube; the output terminal of the motor module is connected to the first end of the motor inductor; the second end of the motor inductor is connected to the first end of the second switch 106.

[0066] Further, the control module 107 is configured to control the operating states of the first switch 105 and the second switch 106 according to the magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including:

[0067] The control module 107 controls the first switch 105 to close and the second switch 106 to open according to the first magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit.

[0068] In some preferred embodiments, the first magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101 is: the voltage of the charging module 104 is less than or equal to the voltage of the battery module 101.

[0069] When the voltage of the charging module 104 is less than or equal to the voltage of the battery module 101, the control module 107 configures the circuit as a DC charging circuit, so that the charging module directly charges the battery module with DC power.

[0070] Further, the control module 107 is configured to control the operating states of the first switch 105 and the second switch 106 according to the magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including:

[0071] The control module 107 controls the second switch 106 to close and the first switch 105 to open according to the second magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a buck charging circuit.

[0072] In some preferred embodiments, the second magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101 is that the voltage of the charging module 104 is greater than the voltage of the battery module 101.

[0073] When the voltage of the charging module 104 is greater than the voltage of the battery module 101, the control module 107 configures the circuit as a buck charging circuit, and by controlling the on / off states of the first switch tube and the second switch tube in the drive module 102, enables the charging module 104 to charge the battery module 101 and the motor module 103. Meanwhile, the present application utilizes the motor module 103 and the adjustable inductor to increase the current output to the battery module 101, thereby enabling the charging module 104 to output at full load with high voltage and large current.

[0074] Further, the charging control circuit further includes: a third switch;

[0075] The first end of the third switch is connected to the second output end of the drive module, and the second end of the third switch is connected to the negative electrode of the charging module.

[0076] Further, after controlling the second switch 106 to close and the first switch 105 to open, it includes:

[0077] The control module 107 controls the third switch to close according to a first preset condition, and controls the first switch tube to turn off and the second switch tube to turn on, so that the charging module 104 charges the battery module 101 and the motor module 103 simultaneously.

[0078] In some preferred embodiments, the first preset condition is that when the motor module 103 does not meet the discharge condition, the control module 107 controls the third switch to close, and controls the first switch tube to turn off and the second switch tube to turn on, so that the charging module 104 charges the battery module 101 and the motor module 103 simultaneously.

[0079] In some preferred embodiments, when the electric quantity stored in the motor inductor of the motor module 103 does not reach a preset electric quantity value, the motor module 103 does not meet the discharge condition.

[0080] When the motor module 103 does not meet the discharge condition, the control module 107 controls the third switch to close, the first switch tube to turn off, and the second switch tube to turn on, so that the current starts from the charging module 104, passes through the battery module 101 and enters the motor module 103, and then returns to the charging module 104 through the turned-on second switch tube, forming a step-down charging circuit. In the step-down charging circuit, the charging module 104 charges both the battery module 101 and the motor module 103 simultaneously. The motor module 103 divides the output voltage of the charging module 104. Therefore, in the step-down charging circuit, the charging module 104 charges the battery module 101 in a step-down manner, and the motor module 103 stores the electrical energy input by the charging module 104.

[0081] Further, after controlling the second switch 106 to close and the first switch 105 to open, it includes:

[0082] The control module 107 controls the third switch to open, the second switch tube to turn off, and the first switch tube to turn on according to the second preset condition, so that the motor module 103 charges the battery module 101.

[0083] In some preferred embodiments, the second preset condition is: when the motor module 103 meets the discharge condition, the control module 107 controls the third switch to open, the second switch tube to turn off, and the first switch tube to turn on, so that the motor module 103 charges the battery module 101.

[0084] In some preferred embodiments, when the electric quantity stored in the motor inductor of the motor module 103 reaches a preset electric quantity value, the motor module 103 meets the discharge condition.

[0085] Further, the charging control circuit further includes: an adjustable inductor;

[0086] The first end of the adjustable inductor is connected to the second end of the second switch;

[0087] The second end of the adjustable inductor is connected to the negative electrode of the battery module.

[0088] In some preferred embodiments, the present application improves the energy storage capacity of the charging control circuit by setting an adjustable inductor in series with the motor inductor of the motor module 103. During the entire charging process of the charging module 104 to the battery module 101, the charging module 104 and the motor module 103 alternately charge the battery module 101. During the process of the motor module 103 charging the battery module 101, the adjustable inductor and the motor module 103 can supply power to the battery module 101 simultaneously.

[0089] If the charging control circuit does not have an adjustable inductor, during the process of the motor module 103 charging the battery module 101, the present application determines the current value input to the battery module 101 through the motor inductor, and charges the battery module 101 with the motor inductor. The present application can configure different motor inductors to adjust the current value input to the battery module 101.

[0090] If the charging control circuit has an adjustable inductor, during the process of the motor module 103 charging the battery module 101, the present application jointly determines the current value input to the battery module 101 through the motor inductor and the adjustable inductor, and charges the battery module 101 with the motor inductor and the adjustable inductor simultaneously. The present application can configure different motor inductors or adjust the parameters of the adjustable inductor to adjust the current value input to the battery module 101, ensuring that the current value output after the motor module 103 and the adjustable inductor are connected in series is greater than the maximum charging current value of the charging module 104, so that the electric energy stored in the buck charging circuit can meet the charging requirements of the battery module 101, and realizing the function of buck-boosting the output of the charging module 104, ensuring that the charging module 104 can output at full load with high voltage and large current, and further improving the charging efficiency of the battery module 101.

[0091] In some preferred embodiments, referring to Figure 2 , the driving module 102 includes three parallel bridge arms, and each bridge arm includes two connected first switching tubes and second switching tubes;

[0092] The emitters of the first switching tubes on each bridge arm are connected to the collectors of the second switching tubes;

[0093] Among them, the collectors of the first switching tubes are respectively connected to the first output end of the driving module 102; the emitters of the first switching tubes are respectively connected to the input end of the driving module 102;

[0094] The emitters of the second switching tubes are respectively connected to the second output end of the driving module 102; the collectors of the second switching tubes are respectively connected to the input end of the driving module 102.

[0095] Correspondingly, the motor module 103 includes: a first motor inductor, a second motor inductor, and a third motor inductor;

[0096] The output end of the motor module 103 is respectively connected to the first end of the first motor inductor, the first end of the second motor inductor, and the first end of the third motor inductor;

[0097] The first end of the first motor inductor, the first end of the second motor inductor, and the first end of the third motor inductor are respectively connected between the first switching tube and the second switching tube of each bridge arm;

[0098] The second ends of the first motor inductor, the second motor inductor, and the third motor inductor are respectively connected to the first end of the second switch.

[0099] In this preferred embodiment, since heat is generated during the charging and discharging processes of the motor inductor, to avoid overheating of the circuit, three motor inductors are configured to charge and discharge simultaneously. Compared with a single motor inductor for charging and discharging, the circuit temperature can be better controlled, and the circuit stability and lifespan can be improved.

[0100] Further, the control module 107 is configured to control the operating states of the first switch 105 and the second switch 106 according to the magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including:

[0101] The control module 107 controls the first switch 105 to close and the second switch 106 to open according to the first magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit.

[0102] In some preferred embodiments, the first magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101 is: the voltage of the charging module 104 is less than or equal to the voltage of the battery module 101.

[0103] When the voltage of the charging module 104 is less than or equal to the voltage of the battery module 101, the control module 107 configures the circuit as a DC charging circuit, enabling the charging module to directly charge the battery module in DC.

[0104] Further, the control module 107 is configured to control the operating states of the first switch 105 and the second switch 106 according to the magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including:

[0105] The control module 107 controls the second switch 106 to close and the first switch 105 to open according to the second magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a buck charging circuit.

[0106] In some preferred embodiments, the second magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101 is: the voltage of the charging module 104 is greater than the voltage of the battery module 101.

[0107] When the voltage of the charging module 104 is greater than the voltage of the battery module 101, the control module 107 configures the circuit as a buck charging circuit, and by controlling the on / off of the first switch tube and the second switch tube in the drive module 102, the charging module 104 charges the battery module 101 and the motor module 103. At the same time, the present application uses the motor module 103 and the adjustable inductor to increase the current output to the battery module 101, so that the charging module 104 can perform full-load output with high voltage and large current.

[0108] Further, the charging control circuit further includes: a third switch;

[0109] The first end of the third switch is connected to the second output end of the drive module, and the second end of the third switch is connected to the negative electrode of the charging module.

[0110] Further, after controlling the second switch 106 to close and the first switch 105 to open, it includes:

[0111] The control module 107 controls the third switch to close according to the first preset condition, and controls the first switch tube to turn off and the second switch tube to turn on, so that the charging module 104 charges the battery module 101 and the motor module 103 simultaneously.

[0112] In some preferred embodiments, the first preset condition is: when the motor module 103 does not meet the discharge condition, the control module 107 controls the third switch to close, and controls the first switch tube to turn off and the second switch tube to turn on, so that the charging module 104 charges the battery module 101 and the motor module 103 simultaneously.

[0113] In some preferred embodiments, when the electric energy stored in all the inductors in the motor module 103 has not reached the preset electric energy value, the motor module 103 does not meet the discharge condition.

[0114] When the motor module 103 does not meet the discharge condition, the control module 107 controls the third switch to close, the first switch tube to turn off, and the second switch tube to turn on, so that the current starts from the charging module 104, passes through the battery module 101 and is input into the motor module 103, and then returns to the charging module 104 through the turned-on second switch tube, forming a buck charging loop. In the buck charging loop, the charging module 104 charges the battery module 101 and the motor module 103 simultaneously. The motor module 103 divides the output voltage of the charging module 104. Therefore, in the buck charging loop, the charging module 104 charges the battery module 101 in a buck manner, and the motor module 103 stores the electric energy input by the charging module 104.

[0115] Further, after controlling the second switch 106 to close and the first switch 105 to open, it includes:

[0116] The control module 107 controls the third switch to open, controls the second switch tube to turn off, and controls the first switch tube to turn on according to a second preset condition, so that the motor module 103 charges the battery module 101.

[0117] In some preferred embodiments, the second preset condition is: when the motor module 103 meets the discharge condition, the control module 107 controls the third switch to open, controls the second switch tube to turn off, and controls the first switch tube to turn on, so that the motor module 103 charges the battery module 101.

[0118] In some preferred embodiments, when the electric quantity stored in any one of the motor inductors in the motor module 103 reaches a preset electric quantity value, the motor module 103 meets the discharge condition.

[0119] When the electric quantity stored in any one inductor in the motor module 103 reaches a preset electric quantity value, the control module 107 controls the third switch to open, controls the second switch tube to turn off, and controls the first switch tube on the arm corresponding to the motor inductor that reaches the preset electric quantity value to turn on, so that the current starts from the motor module 103, passes through the turned-on first switch tube and inputs into the battery module 101, and then returns to the motor module 103 to form a discharge loop. In the discharge loop, the present application uses the motor module 103 and the adjustable inductor to increase the current output to the battery module 101, realizes step-down and current-boosting of the output of the charging module 104, and further enables the charging module 104 to output at full load with high voltage and large current.

[0120] Further, the charging control circuit further includes: an adjustable inductor;

[0121] The first end of the adjustable inductor is connected to the second end of the second switch;

[0122] The second end of the adjustable inductor is connected to the negative electrode of the battery module.

[0123] In some preferred embodiments, the present application improves the energy storage capacity of the charging control circuit by setting an adjustable inductor connected in series with the motor module 103. When the present application controls any one of the first switch tubes to turn on, the adjustable inductor can supply power to the battery module 101.

[0124] When the electric quantity stored in any one of the inductors in the motor module 103 reaches a preset electric quantity value, the control module 107 controls the third switch to disconnect, controls the second switch tube to turn off, and controls the first switch tube on the arm corresponding to the inductor that reaches the preset electric quantity value to turn on, so as to control the inductor that reaches the preset electric quantity value and the adjustable inductor to discharge. The current starts from the motor module 103 and the adjustable inductor, passes through the turned-on first switch tube and inputs into the battery module 101, and then returns to the adjustable inductor and the motor module 103 to form a discharge loop.

[0125] During the entire charging process of the battery module 101 by the charging module 104, the charging module 104 and the motor module 103 charge the battery module 101 alternately. During the process of the motor module 103 charging the battery module 101, the current values output by different motor inductors are different. When the motor inductor in the motor module 103 cannot meet the charging requirement of the battery module 101, that is, when the control module 107 cannot increase the current input into the battery module 101, the present application increases the energy storage capacity of the circuit by adding an adjustable inductor outside the motor, and can ensure that the current value output after the motor module 103 and the adjustable inductor are connected in series is larger than the maximum charging current value of the charging module 104, so that the electric energy stored in the buck charging circuit can meet the charging requirement of the battery module 101, and realize the function of buck-boosting the output of the charging module 104, ensuring that the charging module 104 can output at full load with high voltage and large current, and further improving the charging efficiency of the battery module 101.

[0126] Please refer to Figure 2 , for an example of the charging control circuit of the present application, the circuit includes: a battery module 101, a driving module 102, a motor module 103, a charging module 104, a first switch 105, a second switch 106, and a control module 107 (the control module 107 is not shown in the figure); the control module 107 is respectively connected to the driving module 102, the control end of the first switch 105, the control end of the second switch 106, the control end of the third switch, the control end of the fourth switch, and the control end of the fifth switch;

[0127] The charging control circuit further includes: an adjustable inductor, a third switch, a fourth switch, a fifth switch, a first capacitor, and a second capacitor;

[0128] Specifically, the battery module 101 is the vehicle battery V1, the charging module 104 is the DC charging power supply J1, the first switch 105 is the switch S1, the second switch 106 is the switch S2, the third switch is the switch S3, the adjustable inductor is the inductor L4, the fourth switch is the switch S4, the fifth switch is the switch S5, the first capacitor is the capacitor C1, and the second capacitor is the capacitor C2.

[0129] In some preferred embodiments, the DC charging power supply J1 is a public charging pile.

[0130] The drive module 102 includes: a first capacitor C1 and three bridge arms.

[0131] The first bridge arm includes an electronic control switch tube Q1 and an electronic control switch tube Q2; the second bridge arm includes an electronic control switch tube Q3 and an electronic control switch tube Q4; the third bridge arm includes an electronic control switch tube Q5 and an electronic control switch tube Q6.

[0132] Wherein, the emitter of the electronic control switch tube Q1 is connected to the collector of the electronic control switch tube Q2; the emitter of the electronic control switch tube Q3 is connected to the collector of the electronic control switch tube Q4; the emitter of the electronic control switch tube Q5 is connected to the collector of the electronic control switch tube Q6.

[0133] The bases of the electronic control switch tubes Q1-Q6 are connected to the control module 107, and the control module 107 controls the voltage of the bases of the electronic control switch tubes Q1-Q6 to turn on or off the electronic control switch tubes Q1-Q6.

[0134] Further, the collectors of the electronic control switch tube Q1, the electronic control switch tube Q3, and the electronic control switch tube Q5 are respectively connected to the first output terminal of the drive module 102; the emitters of the electronic control switch tube Q1, the electronic control switch tube Q3, and the electronic control switch tube Q5 are respectively connected to the input terminal of the drive module 102.

[0135] The emitters of the electronic control switch tube Q2, the electronic control switch tube Q4, and the electronic control switch tube Q6 are respectively connected to the second output terminal of the energy storage drive module 102; the collectors of the electronic control switch tube Q2, the electronic control switch tube Q4, and the electronic control switch tube Q6 are respectively connected to the input terminal of the drive module 102.

[0136] The collectors of the electronic control switch tube Q1, the electronic control switch tube Q3, and the electronic control switch tube Q5 are respectively connected to the switch S5 and the first end of the first capacitor C1; after the switch S5 is closed, the collectors of the electronic control switch tube Q1, the electronic control switch tube Q3, the electronic control switch tube Q5, and the first end of the first capacitor C1 are connected to the positive electrode of the battery V1.

[0137] The collectors of the electronic control switch tube Q2, the electronic control switch tube Q4, and the electronic control switch tube Q6 are respectively connected to the switch S1 and the second end of the first capacitor C1; after the switch S1 is closed, the collectors of the electronic control switch tube Q2, the electronic control switch tube Q4, the electronic control switch tube Q6, and the second end of the first capacitor C1 are connected to the negative electrode of the battery V1.

[0138] Further, a switch S2 is connected between the input terminal o of the motor module 103 and the first end of the adjustable inductor L4. The second end of the adjustable inductor L4 is connected to the negative electrode of the battery V1.

[0139] The motor module 103 includes a first motor inductor L1, a second motor inductor L2, and a third motor inductor L3.

[0140] The first end a of the first motor inductor L1 is connected to the position between the electronic control switch tube Q1 and the electronic control switch tube Q2;

[0141] The first end b of the second motor inductor L2 is connected to the position between the electronic control switch tube Q3 and the electronic control switch tube Q4.

[0142] The first end c of the third motor inductor L3 is connected to the position between the electronic control switch tube Q5 and the electronic control switch tube Q6.

[0143] The second ends of the first motor inductor, the second motor inductor, and the third motor inductor are respectively connected to the input terminal o of the motor module 103.

[0144] The first end of the switch S3 is connected to the second output terminal of the driving module 102, and the second end of the switch S3 is connected to the negative electrode of the DC charging power supply J1.

[0145] The positive electrode of the DC charging power supply J1 is respectively connected to the second end of the switch S4 and the first end of the second capacitor C2. The first end of the switch S4 is connected to the first output terminal of the driving module 102.

[0146] The second end of the second capacitor C2 is connected to the second output terminal of the driving module 102.

[0147] The control module 107 is configured to control the working states of the first switch 105 and the second switch 106 according to the magnitude relationship between the voltage of the charging module 104 and the voltage of the battery module 101, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit.

[0148] In some preferred embodiments, please refer to Figure 3 , when the voltage of the charging module 104 is less than or equal to the voltage of the battery module 101, the control module 107 controls the switch S1, the switch S3, the switch S4, and the switch S5 to be closed, and the switch S2 to be opened, controls each first electronic control switch tube (Q1, Q3, and Q5) and the second electronic control switch tube (Q2, Q4, and Q6) to be turned off, and controls the DC charging power supply J1 to charge the battery V1 directly. The arrows in the figure indicate the current direction in the DC charging loop. The current inputs the battery V1 from the positive electrode of the DC charging power supply J1 and returns to the negative electrode of the DC charging power supply J1 from the negative electrode of the battery V1.

[0149] In some preferred embodiments, please refer toFigure 4 When the voltage of the charging module 104 is greater than the voltage of the battery module 101, the control module 107 controls the switches S2, S3, S4, and S5 to close, and the switch S1 to open, and controls each first electronic control switch tube (Q1, Q3, and Q5) to turn off, and the second electronic control switch tubes (Q2, Q4, and Q6) to turn on. The DC charging power supply J1 simultaneously charges the battery V1, the adjustable inductor L4, and the three motor inductors (L1, L2, and L3).

[0150] Among them, the adjustable inductor L4 and the three motor inductors (L1, L2, and L3) divide the output voltage of the DC charging power supply J1. Therefore, in the step-down charging circuit, the DC charging power supply J1 charges the battery V1 in a step-down manner. Preferably, in the step-down charging circuit, the voltage value applied across the battery V1 is the maximum voltage value of the battery V1. The adjustable inductor L4 and the three motor inductors (L1, L2, and L3) store the electrical energy input by the DC charging power supply J1.

[0151] Figure 4 The arrow in indicates the current direction in the step-down charging circuit. The current flows from the positive pole of the DC charging power supply J1 through the battery V1, the adjustable inductor L4, and the three motor inductors (L1, L2, and L3) of the motor module 103 in sequence, flows into the input end of the drive module 102, respectively flows into the collectors of the second electronic control switch tubes (Q2, Q4, and Q6), flows out from the emitters of the second electronic control switch tubes, and flows out of the second output end of the drive module 102, and returns to the negative pole of the DC charging power supply J1, forming a step-down charging circuit.

[0152] Please refer to Figure 5 When the electric quantity stored in any one of the inductors in the motor module 103 reaches the preset electric quantity value, the control module 107 controls the switches S2, S4, and S5 to close, and the switches S1 and S3 to open, and controls one or more first electronic control switch tubes (Q1, Q3, and Q5) to turn on, and the second electronic control switch tubes (Q2, Q4, and Q6) to turn off, and uses the electric energy stored in the motor module 103 and the adjustable inductor L4 to charge the battery module 101 in a step-down and current-boosting manner.

[0153] Exemplarily, when the electric quantity stored in the inductor L1 in the motor module 103 reaches the preset electric quantity value, and the electric quantities stored in the inductors L2 and L3 do not reach the preset electric quantity value, the control module 107 controls the switches S2, S4, and S5 to close, and the switches S1 and S3 to open, and controls the first electronic control switch tube Q1 to turn on, controls the first electronic control switch tubes Q2 and Q3 to turn off, and controls the second electronic control switch tubes (Q2, Q4, and Q6) to turn off.

[0154] When the electric quantity stored in the inductor L1, the inductor L2 and the inductor L3 in the motor module 103 reaches the preset electric quantity value, the control module 107 controls the switch S2, the switch S4 and the switch S5 to be closed, and the switch S1 and the switch S3 to be opened, and controls the first electronically controlled switch tubes Q1, Q2 and Q3 to be turned on, and controls the second electronically controlled switch tubes (Q2, Q4 and Q6) to be turned off.

[0155] Figure 5 The arrows in the figure indicate the direction of the current in the discharge loop. When the electric quantity stored in the inductor L1, the inductor L2 and the inductor L3 reaches the preset electric quantity value, the current flows out from the adjustable inductor L4 and the first electrically controlled switch tubes (Q1, Q2 and Q3), flows into the input end of the driving module 102, flows in from the emitter of each first electrically controlled switch tube, flows out from the collector of each first electrically controlled switch tube, flows out of the first output end of the driving module 102, and returns to the adjustable inductor L4 and the first electrically controlled switch tubes (Q1, Q2 and Q3) through the battery V1, forming a discharge loop.

[0156] Preferably, the control module 107 reduces the voltage value applied to both ends of the battery V1 to the maximum voltage value of the battery V1 by controlling the drive module 102. At the same time, the present application uses the motor module 103 and the adjustable inductor L4 to increase the current output to the battery V1, so as to realize the maximum utilization of the power of the public charging pile to charge the vehicle, thereby improving the charging efficiency of the vehicle. In addition, the present application uses the energy storage in the adjustable inductor to charge the battery module 101, so that the electric energy stored in the step-down charging circuit can meet the charging demand of the battery module 101, and the current input to the battery module 101 is increased to a preset current value, which is jointly determined by the motor inductance and the adjustable inductance, to ensure that the charging module 104 can output at full load with high voltage and high current, further improving the charging efficiency of the battery module 101.

[0157] In some preferred embodiments, when the DC charging power source J1 performs step-down charging on the vehicle, the control module 107 keeps the second switch 106 closed and the first switch 105 open.

[0158] When the power stored in all the inductors in the motor module 103 does not reach the preset power value, that is, in the charging stage, the control module 107 controls the third switch to close, and controls all the first switch tubes to close and all the second switch tubes to open, so as to simultaneously perform voltage reduction charging on the battery V1, the motor module 103 and the adjustable inductor L4.

[0159] When the amount of electricity stored in any one of the inductors in the motor module 103 reaches a preset amount of electricity, that is, in the discharge stage, the control module 107 controls the third switch to be disconnected, controls all the second switch tubes to be closed, and controls the first switch tube corresponding to the inductor that has reached the preset amount of electricity to be opened, so as to perform voltage reduction and current increase charging on the battery module 101.

[0160] When the energy storage of the circuit cannot meet the charging requirement of battery V1, the control module 107 controls the circuit to return to the charging stage, closes the third switch, and controls all the first switching tubes to turn off and all the second switching tubes to turn on, so as to perform step-down charging on the battery V1, the adjustable inductor L4 and the motor module 103 simultaneously. Therefore, during the step-down charging of the vehicle by the DC charging power supply J1, the charging stage and the discharging stage alternate. Among them, the time used for the discharging stage is very short. Therefore, it can be regarded as the DC charging power supply J1 performing step-down and current-boosting charging on the vehicle battery V1.

[0161] In some preferred embodiments, the control module 107 of the present application can adjust the duty cycle of the six electronic control switching tubes in the drive module 102 to control the drive module 102 to convert the electric energy input by the adjustable inductor L4 and the motor module 103 into a preset voltage value. At the same time, the motor module 103 and the adjustable inductor L4 increase the current output to the battery V1 to a preset current value, achieving the function of step-down and current-boosting. Among them, the preset current value is jointly determined by the inductor L1, the inductor L2, the inductor L3 and the adjustable inductor L4.

[0162] The step-down calculation formula is: V1 = V in × D;

[0163] where V1 is the output voltage of the total negative electrode of the battery pack after step-down; V in is the output voltage of the DC charging power supply J1; D is the PWM control duty cycle.

[0164] When the voltage platform of the vehicle is lower than the voltage platform of the public charging pile, that is, the highest voltage of the vehicle is lower than the highest voltage of the public charging pile. Exemplarily, the highest voltage of the existing public charging pile is 1000V, and the maximum charging current is 250A. The charging capacity of this public charging pile is: P 桩 = U 桩 × I 桩 = 1000V × 250A = 250kW.

[0165] When a vehicle with a 400V voltage platform is connected to this public charging pile for charging, the charging capacity of the vehicle in the prior art is P 车 = U 车 × I 桩 = 400V × 250A = 100kW.

[0166] By using the charging control circuit provided in the present application, the control module 107 can reduce the voltage of the 1000V public charging pile to 400V by adjusting the duty cycle of the six electronic control switching tubes in the driving module 102. At the same time, during the discharging stage, the current output by the motor module 103 and the adjustable inductor L4 is increased to a preset current value to charge the battery module 101. The preset current value is jointly determined by the inductor L1, the inductor L2, the inductor L3, and the adjustable inductor L4, and the preset current value is greater than 250A. The charging control circuit provided in the present application is used to perform step-down and current-boosting charging on the vehicle battery, so that the public charging pile can exert the maximum voltage and current upper limit capabilities, perform full-load output with high voltage and large current, and improve the vehicle charging efficiency.

[0167] Implementing the embodiments of the present application has the following effects:

[0168] The charging control circuit provided in the present application selects a DC charging circuit or a step-down charging circuit to charge the battery module according to the magnitude relationship between the input of the connected charging module and the voltage of the battery module. The configured step-down charging circuit in the present application steps down and boosts the current of the output of the charging module through the driving module and the motor module, so that the charging module can perform full-load output with high voltage and large current, exert the maximum voltage and current upper limit capabilities of the charging module, and improve the charging efficiency of the battery module.

[0169] In addition, the present application improves the energy storage capacity of the charging control circuit by setting an adjustable inductor outside the motor, so that the electric energy stored in the step-down charging circuit can meet the charging requirements of the battery module, ensuring that the charging module can perform full-load output with high voltage and large current, and further improving the charging efficiency of the battery module.

Claims

1. A charging control circuit, characterized in that: include: A battery module, a drive module, a motor module, a charging module, a first switch, a second switch and a control module; The control module is connected to the driving module, the first switch and the second switch respectively; The first output terminal of the driving module is connected to the positive electrode of the battery module and the positive electrode of the charging module respectively; The second output end of the driving module is connected to the negative electrode of the charging module and the first end of the first switch respectively, and the second end of the first switch is connected to the negative electrode of the battery module; The output end of the motor module is connected to the input end of the driving module; A first end of the second switch is connected to the motor module, and a second end of the second switch is connected to the negative electrode of the battery module; The control module is used to control the working state of the first switch and the second switch according to the magnitude relationship between the charging module voltage and the battery module voltage, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit.

2. A charging control circuit as claimed in claim 1, characterized in that: The driving module comprises at least one bridge arm, and the bridge arm comprises two connected first switch tubes and a second switch tube; Wherein, the emitter of the first switch tube is connected to the collector of the second switch tube; The collector of the first switch tube is connected to the first output terminal of the driving module; the emitter of the first switch tube is connected to the input terminal of the driving module; The emitter of the second switch tube is connected to the second output end of the driving module; the collector of the second switch tube is connected to the input end of the driving module.

3. A charging control circuit as claimed in claim 2, characterized in that: The motor module includes at least one motor inductor; Wherein, the first end of the motor inductor is connected between the first switch tube and the second switch tube; The output end of the motor module is connected to the first end of the motor inductor; The second end of the motor inductor is connected to the first end of the second switch.

4. A charging control circuit as claimed in claim 3, characterized in that: The control module is used to control the working state of the first switch and the second switch according to the magnitude relationship between the charging module voltage and the battery module voltage, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including: The control module controls the first switch to be closed and the second switch to be opened according to a first magnitude relationship between the charging module voltage and the battery module voltage, so as to configure the charging control circuit as a DC charging circuit.

5. A charging control circuit as claimed in claim 3, characterized in that: The control module is used to control the working state of the first switch and the second switch according to the magnitude relationship between the charging module voltage and the battery module voltage, so as to configure the charging control circuit as a DC charging circuit or a buck charging circuit, including: The control module controls the second switch to be closed and the first switch to be opened according to a second magnitude relationship between the charging module voltage and the battery module voltage, so as to configure the charging control circuit as a buck charging circuit.

6. A charging control circuit as claimed in claim 5, characterized in that: Also includes: The third switch; The first end of the third switch is connected to the second output end of the driving module, and the second end of the third switch is connected to the negative electrode of the charging module.

7. A charging control circuit as claimed in claim 6, characterized in that: After controlling the second switch to be closed and the first switch to be opened, the method comprises: The control module controls the third switch to be closed according to the first preset condition, and controls the first switch tube to be closed and the second switch tube to be opened, so that the charging module can charge the battery module and the motor module at the same time.

8. A charging control circuit as claimed in claim 6, characterized in that: After controlling the second switch to be closed and the first switch to be opened, the method comprises: The control module controls the third switch to be disconnected, controls the second switch to be closed, and controls the first switch to be opened according to a second preset condition, so that the motor module charges the battery module.

9. A charging control circuit according to any one of claims 1 to 8, characterized in that: Also includes: Adjustable inductance; The first end of the adjustable inductor is connected to the second end of the second switch; The second end of the adjustable inductor is connected to the negative electrode of the battery module.

10. A vehicle, characterized in that: Comprising a charging control circuit as described in any one of claims 1-9.

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