CN219351317U - Pre-charging circuit and battery system - Google Patents
Pre-charging circuit and battery system Download PDFInfo
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- CN219351317U CN219351317U CN202320140197.3U CN202320140197U CN219351317U CN 219351317 U CN219351317 U CN 219351317U CN 202320140197 U CN202320140197 U CN 202320140197U CN 219351317 U CN219351317 U CN 219351317U
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Abstract
The utility model discloses a pre-charging circuit and a battery system, which can realize the smoothness and energy storage of current through a pre-charging unit and can release energy after the energy storage, and can realize the switching of a second loop and a first loop which are connected with the pre-charging unit through a loop switching unit, so that the pre-charging of a load can be completed by utilizing the characteristics of the energy storage and the energy release of the pre-charging unit. Meanwhile, the control of the driving circuit to the loop switching unit switching loop can be completed based on the pre-charging current of the pre-charging loop, so that the pre-charging current flowing through the pre-charging unit can be kept in a constant average current state in the continuous energy storage and energy release processes of the pre-charging unit, the pre-charging of a load end can be more stable and rapid, and the overall heat power consumption can be reduced.
Description
Technical Field
The utility model relates to the field of new energy automobiles, in particular to a pre-charging circuit and a battery system.
Background
With the vigorous development of electric vehicles in the new energy field, the safety and energy conservation of battery systems of electric vehicles are more and more emphasized, and the measures for improving the performance and reliability of the systems are more and more abundant. In conventional battery systems, a passive precharge scheme, i.e., precharge resistor current limiting, is typically employed to precharge the bus capacitor. According to the scheme, more heat is generated by the precharge resistor during precharge, on one hand, the service life of the precharge resistor can be influenced, the precharge resistor is possibly caused to fail in heat resistance to cause fire under severe conditions, meanwhile, heat dissipated by the precharge resistor can harm surrounding devices, the system safety is influenced, on the other hand, the system power consumption can be improved, and the system economy is reduced.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a pre-charging circuit which can solve the problem of high thermal power consumption.
The utility model also provides a battery system.
The pre-charging circuit is applied to a battery system, wherein the battery system comprises an energy storage unit, a main positive relay and a main negative relay, the positive electrode of the energy storage unit is connected with one end of the main positive relay, the negative electrode of the energy storage unit is connected with one end of the main negative relay, the other end of the main positive relay is connected with one end of a load, and the other end of the main negative relay is connected with the other end of the load;
the precharge circuit includes:
a precharge unit for smoothing a current flowing through the precharge unit and storing electric energy;
the circuit switching unit is used for switching a first circuit and a second circuit, wherein the first circuit is formed by connecting the pre-charging unit and the load in series, and the second circuit is formed by connecting the pre-charging unit, the energy storage unit, the main positive relay and the load in series;
the driving circuit is provided with a voltage detection end, a reference voltage end and a loop switching control end, wherein the voltage detection end is used for acquiring real-time voltage corresponding to the pre-charging current flowing through the pre-charging unit, the reference voltage end is used for being connected with a first reference voltage, the driving circuit is used for obtaining driving voltage according to the real-time voltage and the first reference voltage, and the driving voltage is output to the loop switching unit through the loop switching control end so that the loop switching unit can complete switching of the second loop and the first loop.
The pre-charging circuit provided by the embodiment of the utility model has at least the following beneficial effects:
the pre-charging unit can realize the gentle and energy storage of current and release energy after energy storage, and the loop switching unit can realize the switching of the second loop and the first loop which are connected with the pre-charging unit, so that the pre-charging of the load can be completed by utilizing the characteristics of energy storage and energy release of the pre-charging unit. Meanwhile, the control of the driving circuit to the loop switching unit switching loop can be completed based on the pre-charging current of the pre-charging loop, so that the pre-charging current flowing through the pre-charging unit can be kept in a constant average current state in the continuous energy storage and energy release processes of the pre-charging unit, the pre-charging of a load end can be more stable and rapid, and the overall heat power consumption can be reduced.
According to some embodiments of the utility model, the loop switching unit comprises:
the switch unit is provided with a switch input end, a switch output end and a switch controlled end, wherein the switch input end is connected with the output end of the pre-charging unit, the switch output end is connected with the negative electrode of the energy storage unit, and the switch controlled end is connected with the loop switching control end; the input end of the pre-charging unit is connected with the other end of the load;
and the input end of the first unidirectional conduction device is connected with the output end of the pre-charging unit, and the output end of the first unidirectional conduction device is connected with one end of the load.
According to some embodiments of the utility model, the loop switching unit further comprises a second unidirectional conducting device connected between the output of the pre-charging unit and the switch input.
According to some embodiments of the utility model, the priming unit comprises:
a precharge inductor having one end connected to the other end of the load;
and one end of the first current sampling resistor is connected with the other end of the pre-charging inductor, and the other end of the first current sampling resistor is connected with the input end of the switch.
According to some embodiments of the utility model, the pre-charge unit further comprises a first protection unit connected between the one end of the pre-charge inductor and the other end of the load.
According to some embodiments of the utility model, the driving circuit includes:
the hysteresis comparator is provided with a first input end, a second input end and a first comparison output end, the first input end is connected with one end of the pre-charging inductor, and the first comparison output end is connected with the switch controlled end;
one end of the first resistor is connected with the second input end, and the other end of the first resistor is connected with the first reference voltage;
and the second resistor is connected between the first comparison output end and the second input end.
According to some embodiments of the utility model, the constraint formula of the precharge current is:
wherein I is MAX For the maximum value of the precharge current, I MIN And R3 is the first resistor, R4 is the second resistor, R1 is the first current sampling resistor, VCC is the working voltage of the hysteresis comparator, and V1 is the first reference voltage.
According to some embodiments of the utility model, the drive circuit further comprises an isolated gate driver connected between the first comparison output and the switch controlled terminal.
According to some embodiments of the utility model, the precharge circuit further comprises:
and the overcurrent protection unit is used for detecting the precharge current flowing through the precharge unit and adjusting the working state of the driving circuit.
According to some embodiments of the utility model, the overcurrent protection unit includes:
the second current sampling resistor is connected between the output end of the switch and the negative electrode of the energy storage unit;
the operational amplifier unit is provided with a third input end, a fourth input end and an operational amplifier output end, and the third input end and the fourth input end are respectively connected with two ends of the second current sampling resistor;
the voltage comparator is provided with a fifth input end, a sixth input end and a second comparison output end, the fifth input end is connected with the operational amplifier output end, the sixth input end is used for being connected with a second reference voltage, and the second comparison output end is used for adjusting the working state of the driving circuit.
A battery system according to an embodiment of the second aspect of the present utility model includes the precharge circuit of the embodiment of the first aspect. The battery system according to the embodiment of the utility model adopts substantially all the technical solutions of the pre-charging circuit according to the above embodiment, so that the battery system has at least all the beneficial effects brought by the technical solutions of the above embodiment.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a system schematic diagram of a battery system according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram showing a voltage variation of a capacitor of a load according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram illustrating a variation of the precharge current flowing through the precharge inductor according to an embodiment of the present utility model.
Reference numerals:
an energy storage unit 110, a main positive relay 120, a main negative relay 130, a load 140,
A pre-charging unit 210, a loop switching unit 220, a driving circuit 230, and an over-current protection unit 240.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be determined reasonably by a person skilled in the art in combination with the specific content of the technical solution.
The following description of the embodiments of the present utility model will be made with reference to the accompanying drawings, in which it is apparent that the embodiments described below are some, but not all embodiments of the utility model.
For better describing the pre-charging circuit of the embodiment of the present utility model, a brief description is given here of a battery system applied, the battery system includes an energy storage unit 110, a main positive relay 120, a main negative relay 130, and a battery management system, the positive electrode of the energy storage unit 110 is connected to one end of the main positive relay 120, the negative electrode of the energy storage unit 110 is connected to one end of the main negative relay 130, the other end of the main positive relay 120 is connected to one end of the load 140, and the other end of the main negative relay 130 is connected to the other end of the load 140; after the battery management system controls the main positive relay 120 and the main negative relay 130 to be closed, the power in the energy storage unit 110 may complete the power supply to the load 140.
Referring to fig. 1, fig. 1 is a pre-charge circuit according to an embodiment of the present utility model, the pre-charge circuit includes a pre-charge unit 210, a current detection unit, a voltage detection unit, a loop switching unit 220,
a precharge circuit comprising:
a precharge unit 210 for smoothing a current flowing through the precharge unit 210 and storing electric energy;
the loop switching unit 220 is configured to switch a first loop and a second loop, where the first loop is formed by connecting the pre-charging unit 210 and the load 140 in series, and the second loop is formed by connecting the pre-charging unit 210, the energy storage unit 110, the main positive relay 120, and the load 140 in series;
the driving circuit 230 has a voltage detection end, a reference voltage end and a loop switching control end, the voltage detection end is used for obtaining a real-time voltage corresponding to the precharge current flowing through the precharge unit 210, the reference voltage end is used for being connected to the first reference voltage V1, the driving circuit 230 is used for obtaining a driving voltage according to the real-time voltage and the first reference voltage V1, and the driving voltage is output to the loop switching unit 220 through the loop switching control end, so that the loop switching unit 220 completes the switching between the second loop and the first loop.
Referring to fig. 1, the loop switching unit 220 may complete switching whether the pre-charging unit 210 is directly connected to two ends of the load 140 to form a first loop, or whether the pre-charging unit 210 forms a second loop through the series energy storage unit 110 and the main positive relay 120. When the circuit switching unit 220 switches to the second circuit after the main relay is closed, the pre-charging unit 210, the energy storage unit 110, the main positive relay 120 and the load 140 are connected in series to form the second circuit, the energy storage unit 110 directly pre-charges the load 140, and meanwhile, the pre-charging unit 210 can smoothly flow through the pre-charging current of the pre-charging unit 210, and meanwhile, energy storage is completed; when the loop switching unit 220 switches to the first loop, the pre-charging unit 210 and the load 140 are connected in series to form the first loop, and the energy stored by the pre-charging unit 210 will pre-charge the load 140; when the precharge is completed, the main negative relay 130 may be turned on, stopping the precharge and starting the formal power supply.
In order to make the precharge smooth and rapid, a precharge current is introduced to control the switching of the loop switching unit 220. By continuously switching the first loop and the second loop, the pre-charging unit 210 continuously stores and releases energy, and the pre-charging current flowing through the pre-charging unit 210 is controlled within a stable range, so that the pre-charging current is kept at a constant average current. In addition, by detecting the precharge voltage across the load 140, it is possible to determine whether the precharge is completed, and when the precharge voltage reaches the requirement, the main negative relay 130 is turned on, so that the formal output power supply can be completed.
In the pre-charging circuit of the embodiment of the present utility model, the pre-charging unit 210 can achieve current smoothing and energy storage, and can release energy after energy storage, and the loop switching unit 220 can achieve switching between the second loop and the first loop connected to the pre-charging unit 210, so that the pre-charging of the load 140 can be completed by utilizing the energy storage and energy release characteristics of the pre-charging unit 210. Meanwhile, the control of the driving circuit 230 to the loop switching unit 220 can be completed based on the precharge current of the precharge loop, so that the precharge current flowing through the precharge unit 210 can be kept in a constant average current state in the continuous energy storage and energy release process of the precharge unit 210, thereby enabling the precharge to the load 140 terminal to be more stable and rapid, and reducing the overall heat power consumption.
Referring to fig. 1, in some embodiments, the loop switching unit 220 includes: a switching unit and a first unidirectional conductive device.
The switch unit is provided with a switch input end, a switch output end and a switch controlled end, wherein the switch input end is connected with the output end of the pre-charging unit 210, the switch output end is connected with the negative electrode of the energy storage unit 110, and the switch controlled end is connected with the loop switching control end; an input end of the pre-charging unit 210 is connected with the other end of the load 140;
the input end of the first unidirectional conduction device is connected with the output end of the pre-charging unit 210, and the output end of the first unidirectional conduction device is connected with one end of the load 140.
Referring to fig. 1, the switching unit is controlled by the driving circuit 230, and the switching-off and switching-on adjustment between the switching input terminal and the switching output terminal can be realized, so that the control of whether the pre-charging unit 210 is communicated with the negative electrode of the energy storage unit 110 can be realized, and further, when the first loop and the second loop need to be switched, the switching-on and switching-off of the switching unit can be directly utilized to complete.
When the switch unit is in the on state, because of the reverse cut-off characteristic of the first unidirectional conduction device, current can be output from the positive electrode of the energy storage unit 110, and flows through the main positive relay 120, the load 140, the pre-charging unit 210 and the switch unit to return to the negative electrode of the energy storage unit 110, so as to form a second loop; when the switch unit is in the off state, the energy storage unit 110 cannot form a loop, at this time, the pre-charging unit 210 can release energy in this state because the first loop works to store energy, and current can flow from the output end of the pre-charging unit 210, through the unidirectional conduction device, enter the load 140, and then return to the input end of the pre-charging unit 210 from the load 140, so as to form the first loop, and continue to pre-charge the capacitor at the end of the load 140.
In some embodiments, the switching unit is a MOS transistor. The MOS tube can realize on-off control under the condition of larger power, and the accurate switching of the second loop and the first loop is ensured. Referring to fig. 1, in fig. 1, an NMOS transistor Q1 is adopted, a source electrode of the NMOS transistor Q1 is connected with a negative electrode of the energy storage unit 110, a drain electrode is connected with an output end of the pre-charging unit 210, and a gate electrode is connected with the driving circuit 230, so that on-off control can be realized under the control of the driving circuit 230. In addition, the MOS tube is adopted to realize load cut-off, and compared with the traditional direct relay access passive resistor pre-charging loop mode, the safety of a circuit can be better protected. In some embodiments, the first unidirectional-conduction device employs a diode, such as the first diode D1 shown in fig. 1.
Referring to fig. 1, in some embodiments, the loop switching unit 220 further includes a second unidirectional conductive device connected between the output terminal of the precharge unit 210 and the switch input terminal. The second unidirectional conduction device can also play a role in reverse interception, so as to achieve the purpose of protection. The second unidirectional conductive device may employ a diode, such as the second diode D2 shown in fig. 1.
In some embodiments, the priming unit 210 includes: a precharge inductance L1 and a first current sampling resistor R1. A precharge sense L1 having one end connected to the other end of the load 140; and one end of the first current sampling resistor R1 is connected with the other end of the precharge inductor L1, and the other end of the first current sampling resistor R is connected with the switch input end. Referring to fig. 1, the precharge inductance L1 may achieve the purpose of smoothing the current and storing energy. When the second loop is in operation, the precharge current flows through the precharge inductor L1, and a part of energy can be stored due to the inductance characteristic of the precharge inductor L1, but as the second loop operation time increases, the precharge current flowing through the precharge inductor L1 continuously increases, meanwhile, the first current sampling resistor R1 converts the precharge current into a real-time voltage, when the real-time voltage increases to exceed the reference voltage, the precharge inductor L1 is switched to the first loop operation through the switch unit, and at this time, the precharge inductor L1 is used as a power supply device to continuously precharge the load 140.
Referring to fig. 1, in some embodiments, the precharge unit 210 further includes a first protection unit connected between one end of the precharge inductor L1 and the other end of the load 140. The first safety unit adopts a fuse, and can protect the safety during the period in a loop by directly fusing when the current is excessive.
Referring to fig. 1, in some embodiments, the driving circuit 230 includes: hysteresis comparator IC2, first resistance R3, second resistance R4. The hysteresis comparator IC2 is provided with a first input end, a second input end and a first comparison output end, wherein the first input end is connected with one end of the precharge inductor L1, and the first comparison output end is connected with the switch controlled end; one end of the first resistor R3 is connected with the second input end, and the other end of the first resistor R3 is connected with the first reference voltage V1; and a second resistor R4 connected between the first comparison output terminal and the second input terminal. Because of the existence of hysteresis comparison logic, the control of the delayed on and off of the switch unit can be completed by using one hysteresis comparator IC2, namely, the determination of the maximum value and the minimum value of the precharge current in the precharge loop can be completed. Specifically, the determination of the maximum value and the minimum value of the precharge current may be completed by using the first reference voltage V1, the first current sampling resistor R1, the operating voltage VCC of the hysteresis comparator IC2, the first resistor R3, and the second resistor R4.
Referring to fig. 1, in some embodiments, the driving circuit 230 further includes an isolated gate driver IC1 connected between the first comparison output terminal and the controlled terminal of the switch. The isolated gate driver IC1 can not only play an isolating role, but also effectively drive the NMOS transistor to act.
Referring to fig. 1, in some embodiments, the precharge circuit further includes an over-current protection unit 240, and the over-current protection unit 240 is configured to detect a precharge current flowing through the precharge unit 210 and adjust an operation state of the driving circuit 230. The overcurrent protection unit 240 may be used as an active safety protection measure, so that when the loop current is large, the switch unit can be actively turned off, thereby achieving the purpose of limiting the excessive current. The overcurrent protection unit 240 can effectively avoid the situation that the fuse is directly blown or the overcurrent operation is performed for a long time.
In some embodiments, the over-current protection unit 240 includes a second current sampling resistor R2, an operational amplifier unit U1, and a voltage comparator U2.
The second current sampling resistor R2 is connected between the output end of the switch and the negative electrode of the energy storage unit 110;
the operational amplifier unit U1 is provided with a third input end, a fourth input end and an operational amplifier output end, and the third input end and the fourth input end are respectively connected with two ends of the second current sampling resistor R2;
the voltage comparator U2 has a fifth input terminal, a sixth input terminal and a second comparison output terminal, where the fifth input terminal is connected to the op-amp output terminal, the sixth input terminal is connected to the second reference voltage V2, and the second comparison output terminal is used for adjusting the working state of the driving circuit 230.
The second current sampling resistor R2 can convert the detected pre-charge current in the loop into real-time voltage, and after preliminary amplification by the operational amplifier unit U1, the pre-charge current is sent to the voltage comparator U2 to be compared with the second reference voltage V2, so as to determine whether the overcurrent occurs. It can be appreciated that the performance criteria of the over-current protection action can be adjusted by changing the voltage value of the second reference voltage V2, so as to adapt to the protection requirements of different pre-charging circuits.
For better describing the precharge circuit according to the embodiment of the present utility model, the precharge circuit is described in a specific embodiment with reference to fig. 1 and 3, in which the energy storage unit 110 directly uses a power battery.
The circuit connection relationship in this embodiment will be described first.
The positive electrode of the power battery is connected with the cathode of the first diode D1 and one end of the load 140, and the other end of the load 140 is connected with one end of the fuse F1; the other end of the fuse F1 is connected with one end of the precharge inductor L1; the other end of the precharge inductor L1 is connected with one end of the first current sampling resistor R1; the other end of the first current sampling resistor R1 is connected with the anode of the first diode D1 and the anode of the second diode D2; the cathode of the second diode D2 is connected with the drain electrode of the NMOS tube Q1; the source electrode of the NMOS tube Q1 is connected with one end of a second current sampling resistor R2, and the other end of the second current sampling resistor R2 is connected with the negative electrode of the power battery. The first diode D1, the load 140, the fuse F1, the precharge inductor L1, and the first current sampling resistor R1 constitute a first loop; the power battery, the fuse F2, the load 140, the fuse F1, the precharge inductor L1, the first current sampling resistor R1, the second diode D2, the NMOS transistor Q1, and the second current sampling resistor R2 form a second loop.
The negative input end of the hysteresis comparator IC2 is connected with one end of the precharge inductor L1, which is close to the first current sampling resistor R1, the positive input end of the hysteresis comparator IC2 is connected with the first reference voltage V1 through the first resistor R3, and a second resistor R4 is arranged between the output end and the positive input end.
The input end of the isolated gate driver IC1 is connected with the output end of the hysteresis comparator IC2, and the output end is connected with the gate of the NMOS tube Q1.
The positive input end and the negative input end of the operational amplifier unit U1 are respectively connected with two ends of the second current sampling resistor R2; the negative input end of the voltage comparator U2 is connected with the output end of the operational amplifier unit U1, the positive input end is connected with the second reference voltage V2, and the output end is connected with the enabling end or the working voltage end of the isolation grid driver IC1.
Based on the above-described specific circuit configuration, the specific operation of the present embodiment will be described herein.
The main positive relay 120 is closed to start pre-charging, and the pre-charging circuit of this embodiment is put into operation, and the positive input terminal vin+ of the hysteresis comparator IC2 is connected to the first reference voltage V1; at this time, the precharge current I is 0, the real-time voltage is 0, that is, the negative input terminal VIN-voltage of the hysteresis comparator IC2 is 0, so that the output terminal VOUT of the hysteresis comparator IC2 outputs the voltage VCC; at this time, the isolated gate driver IC1 drives the NMOS transistor to be turned on, the precharge current flows through the second loop, and the load 140 and the precharge inductance L1 are charged by using the power battery;
when the precharge current reaches the maximum value I MAX When VIN- =i MAX * R1=vin+ and VOUT is 0, at this time, the isolated gate driver IC1 drives the NMOS transistor to be turned off, the precharge current flows through the first loop, the precharge inductor L1 discharges, and the load 140 is charged; when the precharge current is reduced to the minimum value I MIN When VIN- =i MIN * R1=vin+, vout=vcc, at this time, the isolated gate driver IC1 drives the NMOS transistor to be turned on, the precharge current flows through the second loop, and the power battery charges the load 140 and the precharge inductance L1; when the precharge current reaches the maximum value I MAX When VIN- =i MAX * R1=vin+, vout=0, at this time, the isolated gate driver IC1 drives the NMOS transistor off, the precharge current flows through the first loop, the precharge inductor L1 discharges, and the load 140 is charged; the precharge current can be controlled at I by continuously charging and discharging the precharge inductance L1 MAX And I MIN Until the pre-charge requirements are met across the load 140.
Furthermore, a maximum value I of the precharge current is determined MAX And minimum value I MIN Reference may be made to, for exampleThe following formula:
for a better description of the practical effects of the utility model, it is further explained here in connection with fig. 2, 3. As shown in fig. 2, the abscissa is time and the ordinate is voltage on the capacitive side of the load 140, it can be seen that the overall capacitive voltage increases substantially linearly, and because the charging voltage is substantially constant, it can be seen that the precharge current remains substantially constant throughout the charging process, or, as it were, a constant average current state. With further reference to fig. 3, the actual waveform of the precharge current flowing through the precharge inductor L1 is shown in fig. 3, the abscissa of fig. 3 is time, and the ordinate is the current value of the precharge current, it can be seen that, between the continuous on and off of the MOS transistor, the precharge current flowing through the precharge inductor L1 is kept within a constant range, so that the precharge current can be ensured to be in a constant average current effect.
Referring to fig. 1, an embodiment of the present utility model also proposes a battery system including the above-described precharge circuit. The battery system according to the embodiment of the utility model adopts substantially all the technical solutions of the pre-charging circuit according to the above embodiment, so that the battery system has at least all the beneficial effects brought by the technical solutions of the above embodiment.
Referring to fig. 1, in some embodiments, the battery system further includes a second safety unit connected between the positive electrode of the energy storage unit 110 and one end of the main positive relay 120. The second safety unit can realize overcurrent protection, thereby achieving the purpose of protecting the power supply safety of the battery system. The second fuse unit may be a fuse, such as fuse F2 shown in fig. 1.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. The pre-charging circuit is applied to a battery system and is characterized by comprising an energy storage unit, a main positive relay and a main negative relay, wherein the positive electrode of the energy storage unit is connected with one end of the main positive relay, the negative electrode of the energy storage unit is connected with one end of the main negative relay, the other end of the main positive relay is connected with one end of a load, and the other end of the main negative relay is connected with the other end of the load;
the precharge circuit includes:
a precharge unit for smoothing a current flowing through the precharge unit and storing electric energy;
the circuit switching unit is used for switching a first circuit and a second circuit, wherein the first circuit is formed by connecting the pre-charging unit and the load in series, and the second circuit is formed by connecting the pre-charging unit, the energy storage unit, the main positive relay and the load in series;
the driving circuit is provided with a voltage detection end, a reference voltage end and a loop switching control end, wherein the voltage detection end is used for acquiring real-time voltage corresponding to the pre-charging current flowing through the pre-charging unit, the reference voltage end is used for being connected with a first reference voltage, the driving circuit is used for obtaining driving voltage according to the real-time voltage and the first reference voltage, and the driving voltage is output to the loop switching unit through the loop switching control end so that the loop switching unit can complete switching of the second loop and the first loop.
2. The precharge circuit of claim 1, wherein the loop switching unit comprises:
the switch unit is provided with a switch input end, a switch output end and a switch controlled end, wherein the switch input end is connected with the output end of the pre-charging unit, the switch output end is connected with the negative electrode of the energy storage unit, and the switch controlled end is connected with the loop switching control end; the input end of the pre-charging unit is connected with the other end of the load;
and the input end of the first unidirectional conduction device is connected with the output end of the pre-charging unit, and the output end of the first unidirectional conduction device is connected with one end of the load.
3. The precharge circuit of claim 2, wherein the loop switch unit further comprises a second unidirectional conduction device connected between the output of the precharge unit and the switch input.
4. The precharge circuit of claim 2, wherein the precharge unit comprises:
a precharge inductor having one end connected to the other end of the load;
and one end of the first current sampling resistor is connected with the other end of the pre-charging inductor, and the other end of the first current sampling resistor is connected with the input end of the switch.
5. The precharge circuit of claim 4, wherein said drive circuit comprises:
the hysteresis comparator is provided with a first input end, a second input end and a first comparison output end, the first input end is connected with one end of the pre-charging inductor, and the first comparison output end is connected with the switch controlled end;
one end of the first resistor is connected with the second input end, and the other end of the first resistor is connected with the first reference voltage;
and the second resistor is connected between the first comparison output end and the second input end.
6. The precharge circuit of claim 5, wherein the constraint formula for the precharge current is:
wherein I is MAX For the maximum value of the precharge current, I MIN And R3 is the first resistor, R4 is the second resistor, R1 is the first current sampling resistor, VCC is the working voltage of the hysteresis comparator, and V1 is the first reference voltage.
7. The precharge circuit of claim 5, wherein said drive circuit further comprises an isolated gate driver connected between said first comparison output and said switch controlled terminal.
8. The precharge circuit of claim 2, wherein said precharge circuit further comprises:
and the overcurrent protection unit is used for detecting the precharge current flowing through the precharge unit and adjusting the working state of the driving circuit.
9. The precharge circuit of claim 8, wherein the overcurrent protection unit comprises:
the second current sampling resistor is connected between the output end of the switch and the negative electrode of the energy storage unit;
the operational amplifier unit is provided with a third input end, a fourth input end and an operational amplifier output end, and the third input end and the fourth input end are respectively connected with two ends of the second current sampling resistor;
the voltage comparator is provided with a fifth input end, a sixth input end and a second comparison output end, the fifth input end is connected with the operational amplifier output end, the sixth input end is used for being connected with a second reference voltage, and the second comparison output end is used for adjusting the working state of the driving circuit.
10. A battery system comprising a pre-charge circuit as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320140197.3U CN219351317U (en) | 2023-01-12 | 2023-01-12 | Pre-charging circuit and battery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320140197.3U CN219351317U (en) | 2023-01-12 | 2023-01-12 | Pre-charging circuit and battery system |
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| Publication Number | Publication Date |
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| CN219351317U true CN219351317U (en) | 2023-07-14 |
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| CN202320140197.3U Active CN219351317U (en) | 2023-01-12 | 2023-01-12 | Pre-charging circuit and battery system |
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| Country | Link |
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| CN (1) | CN219351317U (en) |
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- 2023-01-12 CN CN202320140197.3U patent/CN219351317U/en active Active
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Address after: 518000 1-2 Floor, Building A, Xinwangda Industrial Park, No. 18 Tangjianan Road, Gongming Street, Guangming New District, Shenzhen City, Guangdong Province Patentee after: Xinwangda Power Technology Co.,Ltd. Address before: 518000 Xinwangda Industrial Park, No.18, Tangjia south, Gongming street, Guangming New District, Shenzhen City, Guangdong Province Patentee before: SUNWODA ELECTRIC VEHICLE BATTERY Co.,Ltd. |
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