CN216069689U - Direct current charging signal processing circuit and battery management system - Google Patents
Direct current charging signal processing circuit and battery management system Download PDFInfo
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- CN216069689U CN216069689U CN202122092757.6U CN202122092757U CN216069689U CN 216069689 U CN216069689 U CN 216069689U CN 202122092757 U CN202122092757 U CN 202122092757U CN 216069689 U CN216069689 U CN 216069689U
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Abstract
The utility model provides a direct current charging signal processing circuit and a battery management system, wherein the direct current charging signal processing circuit comprises a connection state detection circuit and a wake-up control circuit, wherein the input end of the connection state detection circuit receives a wake-up signal, the output end of the connection state detection circuit is connected to the input end of the wake-up control circuit, and the output end of the wake-up control circuit is connected to a wake-up pin of a power chip to provide the wake-up signal for the power chip. The utility model uses the low-voltage auxiliary power supply signal in the direct current charging to wake up the battery management system to realize the charging function, and can enter the dormant state again after being waken up under the condition of charging completion.
Description
Technical Field
The utility model relates to the field of electric automobiles, in particular to a direct-current charging signal processing circuit and a battery management system.
Background
When an electric vehicle is parked, if a Battery Management System (BMS) is in a working state for a long time, the electric quantity of a storage Battery is consumed, so that the storage Battery is in a power shortage state, and a vehicle cannot be normally powered on to run.
When the electric vehicle in the sleep state requires dc charging, the BMS must be awakened to enter the operating state. According to the general requirements for electric vehicle conductive charging systems (GBT 18487.1-2015) standard, dc charging is a process in which a charging gun is plugged in and the BMS is awakened by charging a + level signal.
Adopt CC2 department resistance awakening BMS usually among the prior art, if use CC2 signal awaken up and must set up constant voltage source or constant current source circuit, but constant voltage source or constant current source circuit can lead to the condition of mistake awakening to take place, and adopt constant voltage source or constant current source to do the awakening source and need electric automobile with 12V ordinary power conversion constant current source or constant current source, the cost is too high, and the circuit is in operating condition for a long time, can not satisfy whole car static requirement, the battery management system awakens the back up, the battery package is full of electricity, the BMS can be in operating condition under the condition of not pulling out the rifle always, can't get into the dormant state again, thereby lead to the battery to be in the feed state always, cause the energy waste, thereby make 12V battery life reduce.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a direct current charging signal processing circuit and a battery management system, which can wake up a BMS through a low-voltage auxiliary power supply A + signal in an external charging pile, can not influence the dormancy of the BMS under the condition that a charging gun is not pulled out after charging is finished, and have the advantages of simple and reliable circuit and lower cost.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
according to an aspect of the present invention, a dc charging signal processing circuit is provided, which includes a connection state detection circuit and a wake-up control circuit, wherein an input terminal of the connection state detection circuit receives a wake-up signal, an output terminal of the connection state detection circuit is connected to an input terminal of the wake-up control circuit, and an output terminal of the wake-up control circuit is connected to a wake-up pin of a power chip to provide the wake-up signal for the power chip.
In some embodiments, the wake-up control circuit includes a first control switch, a first diode, a first resistor, a second resistor, and a first capacitor, the first connection end of the first control switch is used as the input end of the wake-up control circuit and connected to the output end of the connection state detection circuit, the second connection end of the first control switch is used as the output end of the wake-up control circuit and connected to a wake-up pin of the power chip, one end of the first resistor is connected to the first connection end of the first control switch, the other end of the first resistor is grounded, one end of the first capacitor is connected to the other end of the first resistor, the other end of the first capacitor is connected to one end of the second resistor, the other end of the second resistor is connected to the control end of the first control switch, the anode of the first diode is connected to the other end of the second resistor, and the cathode of the first diode is connected to one end of the first resistor.
In some embodiments, the connection status detection circuit comprises a second diode, wherein an anode of the second diode is connected as an input of the connection status detection circuit to receive the wake-up signal, and a cathode of the second diode is connected as an output of the connection status detection circuit to an input of the wake-up control circuit.
In some embodiments, the dc charging signal processing circuit further includes a voltage stabilizing circuit, wherein an input terminal of the voltage stabilizing circuit is connected between the output terminal of the connection state detecting circuit and the input terminal of the wake-up control circuit, and an output terminal of the voltage stabilizing circuit is grounded.
In some embodiments, the dc charging signal processing circuit further includes a signal transmission circuit, wherein an input terminal of the signal transmission circuit is connected to an output terminal of the wake-up control circuit, and an output terminal of the signal transmission circuit is connected to a wake-up pin of the power chip.
In some embodiments, the signal transmission circuit includes a third diode, a third resistor, a fourth resistor, and a second capacitor, wherein an anode of the third diode is connected to the output terminal of the wake-up control circuit as the input terminal of the signal transmission circuit, a cathode of the third diode is connected to one end of the third resistor, the other end of the third resistor is grounded, one end of the fourth resistor is connected to a cathode of the third diode, the other end of the fourth resistor is connected to the wake-up pin of the power chip as the output terminal of the signal transmission circuit, one end of the second capacitor is connected to the other end of the fourth resistor, and the other end of the second capacitor is grounded.
In some embodiments, the dc charging signal processing circuit further comprises a signal acquisition circuit, wherein an input terminal of the signal acquisition circuit is connected between an output terminal of the connection state detection circuit and an input terminal of the wake-up control circuit, and an output terminal of the signal acquisition circuit is connected to an input pin of the microcontroller.
In some embodiments, the signal acquisition circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second control switch, one end of the fifth resistor is connected between the output end of the connection state detection circuit and the input end of the wake-up control circuit as the input end of the signal acquisition circuit, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is grounded, the control end of the second control switch is connected to the other end of the fifth resistor, the first connection end of the second control switch is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to a power supply output pin of the power chip, the second connection end of the second control switch is grounded, one end of the eighth resistor is connected to the one end of the seventh resistor, and the other end of the eighth resistor is connected to an input pin of the microcontroller as the output end of the signal acquisition circuit.
In some embodiments, the input terminal of the connection state detection circuit is used for connecting to the positive terminal of the low-voltage auxiliary power supply signal of the external charging pile.
In a second aspect, a battery management system is provided, which comprises a dc charging signal processing circuit according to any one of the above.
Compared with the prior art, the utility model has the following beneficial effects:
the method can wake up the BMS by utilizing the high-low level characteristic of a low-voltage auxiliary power supply A + signal in the charging pile after the charging gun is plugged;
secondly, an independent wake-up source is not required to be arranged before charging and gun plugging, and the circuit does not work and does not have static power consumption current;
after the charging work of the system is finished, the circuit can continuously keep low level output, the BMS is not influenced to enter a sleep mode, and the circuit is in a zero current working mode;
fourthly, the direct current charging signal processing circuit is simple in structure and stable and reliable in work.
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 the practice of the embodiments of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic diagram of a dc charging control pilot circuit according to an embodiment of the present invention.
Fig. 2 shows a first schematic diagram of a dc charging signal processing circuit according to an embodiment of the present invention.
Fig. 3 shows a schematic diagram two of the charging signal processing circuit according to the embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of a battery management system provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The scheme provided by the utility model mainly relates to an electric vehicle charging technology, and can be applied to an electric vehicle direct current charging scene meeting the requirements of an electric vehicle conduction charging system, as shown in fig. 1, a schematic diagram of a direct current charging control guide circuit provided by the embodiment of the utility model is shown, in the application scene, a charging interface and a socket thereof meet the requirements of a direct current charging interface of a connecting device for electric vehicle conduction charging (GB/T20234.3-2015), and the connection mode of the charging interface in the application scene is a mode C charging mode 4 and meets the requirements of a general requirement of an electric vehicle conduction charging system (GB/T18487.1-2015).
As shown in fig. 1, the vehicle comprises three major parts, namely a power supply device, a vehicle interface and an electric vehicle, wherein the power supply device is connected with a direct current charging interface on the vehicle through a charging gun to charge the electric vehicle, the direct current charging interface comprises a direct current power supply positive DC +, a direct current power supply negative DC-, a protection grounding PE, a charging communication positive S +, a charging communication negative S-, a first charging Connection confirmation (Connection confirmation 1, CC1), a second charging Connection confirmation (Connection confirmation 2, CC2), a low-voltage auxiliary power supply positive a + and a low-voltage auxiliary power supply negative a-, the vehicle interface comprises a power supply socket and a vehicle plug, and the vehicle socket is arranged on the electric vehicle. Wherein between CC1 interface and the PE, be pure resistance nature between CC2 interface and the PE, power supply unit carries out the direct current to electric automobile through filling the rifle soon and connecting vehicle socket and charge, and specific direct current charging process is as follows:
wherein the resistor R1 is arranged inside the power supply equipment, the resistor R2, the resistor R3 and the switch S are arranged on the quick-charging gun, the switch S is a normally closed switch on the quick-charging gun, the resistor R4 is arranged at a vehicle socket, and the resistor R5 is arranged inside the BMS inside the vehicle controller.
Before a vehicle plug is not inserted into a vehicle socket, an operator carries out charging setting on an off-board charger, an off-board charger controller judges whether the vehicle plug is completely connected with the vehicle socket or not according to the voltage of a detection point 1, the off-board charger controller is arranged inside the off-board charger, specifically, a power supply U1 in the off-board charger provides a 12V or 5V power supply (taking 12V as an example), a power supply U1 is grounded through a resistor R1, a resistor R2 and a switch S, and the voltage of the detection point 1 is 6V at the moment.
After the vehicle plug is completely connected with the vehicle socket, a resistor R4 (a resistor R2 is connected with a resistor R4 in parallel) is connected in parallel at a CC1 interface circuit, the total resistance of the circuit at the CC1 interface changes at the moment, the voltage collected by the off-board charger controller at the detection point 1 changes from 6V to 4V at the moment, the off-board charger controller judges that the vehicle plug is completely connected with the vehicle socket, the off-board charger controller closes a switch K3 and a switch K4 to conduct a low-voltage auxiliary power supply loop, closes the switch K1 and the switch K2 to perform insulation detection (IMD), and the IMD is separated from a high-voltage loop after passing, the residual voltage of the direct current power supply cable is discharged, the switch K1 and the switch K2 are turned on again after the self-checking of the off-board charger is finished, and meanwhile, the communication handshake messages are periodically sent to the electric automobile through the charging communication positive S + and the charging communication positive S-.
If the electric automobile needs to use the off-board charger to provide the low-voltage auxiliary power supply, after the low-voltage auxiliary power supply provided by the off-board charger is obtained, the vehicle controller on the electric automobile judges whether the vehicle interface is completely connected or not through the voltage value of the detection point 2, if the vehicle does not need the off-board charger to provide a low-voltage auxiliary power supply, the voltage value of the detection point 2 is directly measured to judge whether the vehicle interface is connected, specifically, the internal power supply U2 of the electric vehicle provides a 12V or 5V power supply (taking 12V as an example), the U2 forms a loop after being connected in series through a resistor R5 and a resistor R3, the voltage of the detection point 2 is 6V at the moment, once the voltage of 6V is detected, the vehicle controller confirms that the vehicle plug is completely connected with the vehicle socket, and the electric vehicle can send a handshake message through a charging communication positive S + and a charging communication negative S-start cycle.
After electric automobile and non-vehicle charge machine communication are established and are accomplished, non-vehicle charge chance tells BMS will charge with big voltage and electric current, BMS knows the back and carries out the self-checking equally, with this information routing to non-vehicle charge machine after possessing the charging condition, non-vehicle charge machine controller closed switch K1 and switch K2 again this moment, the beginning power supply, vehicle controller can control switch K5 and switch K6 actuation simultaneously, non-vehicle charge machine begins to charge to the battery package this moment.
The present invention provides a dc charging signal processing circuit, which is shown in fig. 2 and is a schematic diagram of the dc charging signal processing circuit according to the embodiment of the present invention. As shown in fig. 2, the dc charging signal processing circuit includes a connection state detection circuit 100 and a wake-up control circuit 200.
The input end of the connection state detection circuit 100 receives the wake-up signal, the output end of the connection state detection circuit 100 is connected to the input end of the wake-up control circuit 200, and the output end of the wake-up control circuit 200 is connected to a wake-up pin of the power chip to provide the wake-up signal for the power chip.
In the embodiment of the present invention, the connection state detection circuit 100 is used to detect whether the external charging gun is accurately connected to the vehicle socket, and the wake-up control circuit 200 is used to receive a wake-up signal input from the outside and wake up the power chip.
In an embodiment of the present invention, the input end of the connection status detection circuit 100 is connected to a low-voltage auxiliary power a + signal terminal (i.e., a positive terminal) on a vehicle socket of the electric vehicle, when the charging gun is not inserted into the vehicle socket, the input end of the connection status detection circuit 100 does not have a wake-up signal input, when the charging gun is inserted into the vehicle socket, the input end of the connection status detection circuit 100 receives a wake-up signal from the low-voltage auxiliary power a + signal terminal and inputs the wake-up signal into the wake-up control circuit 200, and the wake-up control circuit 200 receives the wake-up signal and outputs the wake-up signal to a wake-up pin of the power chip to wake up the power chip.
Referring to fig. 3, which is a schematic diagram of a dc charging signal processing circuit according to a second embodiment of the present invention, as shown in fig. 3, the wake-up control circuit 200 includes a first control switch K101, a first diode D101, a first resistor R101, a second resistor R102, and a first capacitor C101.
Specifically, a first connection end of the first control switch K101 is used as an input end of the wake-up control circuit 200 and connected to an output end of the connection state detection circuit 100, a second connection end of the first control switch K101 is used as an output end of the wake-up control circuit 200 and connected to a wake-up pin of the power chip, one end of the first resistor R101 is connected to the first connection end of the first control switch K101, the other end of the first resistor R101 is grounded, one end of the first capacitor C101 is connected to the other end of the first resistor R101, the other end of the first capacitor C101 is connected to one end of the second resistor R102, the other end of the second resistor R102 is connected to a control end of the first control switch K101, an anode of the first diode D101 is connected to the other end of the second resistor R102, and a cathode of the first diode D101 is connected to the one end of the first resistor R101.
In the embodiment of the utility model, the control switch K101 can be realized by utilizing various existing gating control switches, and the power supply chip provides a power supply for the BMS after being awakened so that the BMS enters a normal working state.
In a preferred embodiment, the control switch K101 may include, but is not limited to, a field effect transistor and a transistor, and here, a PNP transistor is taken as an example, an emitter of the PNP transistor is connected to the output terminal of the connection state detection circuit 100 as the first connection terminal of the first control switch K101, a base of the PNP transistor is connected to the other terminal of the second resistor R102 as the control terminal of the first control switch K101, and a collector of the PNP transistor is connected to the wake-up pin of the power chip as the second connection terminal of the first control switch K101.
For example, when the charging gun is not connected to the vehicle socket, the low-voltage auxiliary power supply a + signal terminal on the socket has no low-voltage auxiliary power supply a + signal input, and the PNP type triode is in a cut-off state, so that the power chip in the BMS cannot be awakened; when the rifle that charges inserts the corresponding socket on the vehicle, low pressure auxiliary power supply A + signal terminal on the socket will obtain a high level wake-up signal, at this moment, this wake-up signal charges first electric capacity C101 via first resistance R101, at this moment, the base of PNP type triode responds to high level signal, control PNP type triode is in the conducting state, thereby PNP type triode's collecting electrode obtains high level wake-up signal, this high level wake-up signal inserts power chip's the pin of awakeing up, thereby awaken up whole BMS.
In addition, the wake-up signal charges the first capacitor C101 through the first resistor R101, and along with the full charge of the first capacitor C101, the voltage at the other end of the first capacitor C101 is pulled down, and at the moment, the base of the PNP type triode responds to the low level signal to control the PNP type triode to be in a cut-off state, and the high level signal of the collector of the PNP type triode is pulled down again, so that the wake-up pin of the power chip is also pulled down, and at the moment, the BMS can enter the dormant state again at any time after the charging operation is completed. Here, the first diode D101 may be used to drain the charge when the first capacitor C101 is charged to the ground, avoiding damage to the BMS internal circuit.
It should be noted that the parameter of the first capacitor C101 determines the time of the high level pulse, and the parameter of the first capacitor C101 is selected according to the requirement of the power chip for the wake-up time.
As shown in fig. 3, the connection status detecting circuit 100 may include a second diode D102, wherein an anode of the second diode D102 is used as an input terminal of the connection status detecting circuit 100 to receive the wake-up signal, and a cathode of the second diode D102 is used as an output terminal of the connection status detecting circuit 100 to be connected to an input terminal of the wake-up control circuit 200.
In the embodiment of the present invention, the anode of the second diode D102 is connected to the signal terminal of the low voltage auxiliary power supply a + as the input terminal of the connection status detection circuit 100, and is used to detect whether the charging gun is inserted reversely.
As shown in fig. 3, the dc charging signal processing circuit may further include a voltage stabilizing circuit 300, wherein an input terminal of the voltage stabilizing circuit 300 is connected between an output terminal of the connection state detecting circuit 100 and an input terminal of the wake-up control circuit 200, and an output terminal of the voltage stabilizing circuit 300 is grounded.
In a preferred embodiment, the voltage stabilizing circuit 300 may include a zener diode D104, wherein a cathode of the zener diode D104 is connected between a cathode of the second diode D102 and the input terminal of the wake-up control circuit 200, and an anode of the zener diode D104 is grounded.
In the embodiment of the present invention, the zener diode D104 is a backward diode, and is configured to perform voltage stabilization processing on the input wake-up signal.
As shown in fig. 3, the dc charging signal processing circuit may further include a signal transmission circuit 400, wherein an input terminal of the signal transmission circuit 400 is connected to an output terminal of the wake-up control circuit 200, and an output terminal of the signal transmission circuit 400 is connected to a wake-up pin of the power chip.
In the embodiment of the present invention, the signal transmission circuit 400 is configured to perform voltage stabilization and filtering processing on the wake-up signal output by the wake-up control circuit 200, and then input the wake-up signal to the wake-up pin of the power chip.
In a preferred embodiment, the signal transmission circuit 400 may include a third diode D103, a third resistor R103, a fourth resistor R104, and a second capacitor C102, wherein an anode of the third diode D103 is connected to the output terminal of the wake-up control circuit 200 as the input terminal of the signal transmission circuit 400, a cathode of the third diode D103 is connected to one end of the third resistor R103, another end of the third resistor R103 is grounded, one end of the fourth resistor R104 is connected to the cathode of the third diode D103, another end of the fourth resistor R104 is connected to the wake-up pin of the power chip as the output terminal of the signal transmission circuit 400, one end of the second capacitor C102 is connected to the another end of the fourth resistor R104, and another end of the second capacitor C102 is grounded.
In the embodiment of the utility model, the third resistor R103 is a voltage-dividing current-limiting resistor to prevent the power chip from being damaged due to excessive current flowing into the wake-up pin of the power chip, and the second capacitor C102 and the fourth resistor R104 form an RC filter circuit to filter the wake-up signal and input the filtered wake-up signal into the wake-up pin of the power chip.
As shown in fig. 3, the charging signal processing circuit may further include a signal acquisition circuit 500, an input terminal of the signal acquisition circuit 500 is connected between the output terminal of the connection state detection circuit 100 and the input terminal of the wake-up control circuit 200, and an output terminal of the signal acquisition circuit 500 is connected to an input pin of the microcontroller.
In the embodiment of the present invention, the signal acquisition circuit 500 is configured to acquire a low-voltage auxiliary power wake-up signal input by the a + signal terminal of the low-voltage auxiliary power.
In a preferred example, the signal acquisition circuit 500 may include a fifth resistor R105, a sixth resistor R106, a seventh resistor R107, an eighth resistor R108, and a second control switch K102, wherein one end of the fifth resistor R105 is connected between the output terminal of the connection state detection circuit 100 and the input terminal of the wake-up control circuit 200 as the input terminal of the signal acquisition circuit 500, the other end of the fifth resistor R105 is connected to one end of the sixth resistor R106, and the other end of the sixth resistor R106 is grounded.
In the embodiment of the present invention, the fifth resistor R105 and the sixth resistor R106 perform current-limiting and voltage-dividing processing on the wake-up signal received from the connection state detection circuit 100, and then input the wake-up signal to the second control switch K102, so as to prevent devices in the circuit from being damaged.
A control end of the second control switch K102 is connected to the other end of the fifth resistor R105, a first connection end of the second control switch K102 is connected to one end of the seventh resistor R107, the other end of the seventh resistor R107 is connected to a power supply output pin (not shown in the figure) of the power chip, and a second connection end of the second control switch K102 is grounded.
In the embodiment of the present invention, a power supply output pin of the power chip is output to the first connection terminal of the second control switch K102 through the seventh resistor R107, and is used for providing a switching power supply for the second control switch K102.
One end of the eighth resistor R108 is connected to the one end of the seventh resistor R107, and the other end of the eighth resistor R108 is connected to an input pin of the microcontroller as an output end of the signal acquisition circuit 500.
In the embodiment of the present invention, the eighth resistor R108 and the seventh resistor R107 form a voltage division after the second control switch K102 is turned on, so as to detect the voltage value of the first connection end of the second control switch K102.
In a preferred embodiment, the second control switch K102 can be implemented by using various existing gate control switches, and in a preferred embodiment, the control switch K102 can include, but is not limited to, a field effect transistor and a transistor, where a P-channel field effect transistor (PMOS) is taken as an example, a gate of the PMOS is connected to the other end of the fifth resistor R105 as a control terminal of the second control switch K102, a drain of the PMOS is connected to the one end of the seventh resistor R107 as a first connection terminal of the second control switch K102, and a source of the PMOS is grounded as a second connection terminal of the second control switch K102.
Specifically, when the rifle that charges is not connected to the vehicle socket, the low voltage auxiliary power A + signal terminal does not have the wake-up signal input this moment, and the grid of PMOS does not have the high level input this moment, and PMOS is in the off-state, and the drain electrode of PMOS is the 5V high level of output in the BMS, and the signal acquisition pin (promptly, input pin) of microcontroller gathers the high level signal through eighth resistance this moment, and microcontroller confirms that there is not the wake-up signal input this moment. After the charging gun is connected to a vehicle socket, the low-voltage auxiliary power supply A + signal terminal receives a wake-up signal, the signal is input to a grid electrode of the PMOS through the voltage division and current limiting effects of the fifth resistor R105 and the sixth resistor R106 to enable the PMOS to be in a conducting state, after the PMOS is conducted, a drain electrode of the PMOS outputs a low level, a signal acquisition pin of the microcontroller acquires a low level signal, and the microcontroller determines that the wake-up signal is input at this time.
Illustratively, the input terminal of the connection state detection circuit 100 is for connection to the positive terminal (i.e., dc a +) of the low voltage auxiliary power signal of the external charging post.
In the embodiment of the present invention, taking the dc charging scenario shown in fig. 1 as an example, a dc charging interface on an electric vehicle is provided with a low-voltage auxiliary power signal terminal, which specifically includes a positive terminal (a +) of a low-voltage auxiliary power signal and a negative terminal (a-) of the low-voltage auxiliary power signal, the low-voltage auxiliary power signal terminal is used for receiving a low-voltage auxiliary power signal provided by a charging pile, and an input end of a connection state detection circuit 100 is connected to a positive terminal of a low-voltage auxiliary power signal of an external charging pile.
The utility model also provides a battery management system, which comprises the direct current charging signal processing circuit in any embodiment.
Referring to fig. 4, a schematic structural diagram of a battery management system according to an embodiment of the present invention is shown, and specifically, the battery management system includes a connection state detection circuit 100, a wake-up control circuit 200, a voltage stabilizing circuit 300, a signal transmission circuit 400, a signal acquisition circuit 500, a power chip 600, and a microprocessor 700.
The utility model provides a direct current charging signal processing circuit and a battery management system, wherein a low-voltage auxiliary power supply A + signal in a charging pile is used for awakening a BMS, the BMS is not subjected to static power consumption, the BMS is directly awakened by hardware, software control is not required, the structure is simple, the cost is lower, the circuit automatically enters a sleep mode under the condition of ensuring the normal work of the circuit after the BMS is awakened, the work is stable and reliable, and the circuit is not influenced by external dynamic voltage change and environment.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A DC charging signal processing circuit is characterized in that the DC charging signal processing circuit comprises a connection state detection circuit and a wake-up control circuit,
the input end of the connection state detection circuit receives the wake-up signal, the output end of the connection state detection circuit is connected to the input end of the wake-up control circuit, and the output end of the wake-up control circuit is connected to a wake-up pin of the power chip to provide the wake-up signal for the power chip.
2. The DC charging signal processing circuit of claim 1, wherein the wake-up control circuit comprises a first control switch, a first diode, a first resistor, a second resistor, and a first capacitor,
wherein, the first connecting end of the first control switch is used as the input end of the wake-up control circuit to be connected to the output end of the connection state detection circuit, the second connecting end of the first control switch is used as the output end of the wake-up control circuit to be connected to the wake-up pin of the power chip,
one end of the first resistor is connected to the first connection end of the first control switch, the other end of the first resistor is grounded,
one end of the first capacitor is connected to the other end of the first resistor, the other end of the first capacitor is connected to one end of the second resistor, the other end of the second resistor is connected to the control end of the first control switch,
an anode of the first diode is connected to the other end of the second resistor, and a cathode of the first diode is connected to the one end of the first resistor.
3. The direct current charging signal processing circuit according to claim 1, wherein the connection state detection circuit includes a second diode,
the anode of the second diode is used as the input end of the connection state detection circuit to receive the wake-up signal, and the cathode of the second diode is used as the output end of the connection state detection circuit to be connected to the input end of the wake-up control circuit.
4. The direct current charging signal processing circuit of claim 1, further comprising a voltage stabilizing circuit,
the input end of the voltage stabilizing circuit is connected between the output end of the connection state detection circuit and the input end of the awakening control circuit, and the output end of the voltage stabilizing circuit is grounded.
5. The DC charging signal processing circuit of claim 1, further comprising a signal transmission circuit,
the input end of the signal transmission circuit is connected to the output end of the wake-up control circuit, and the output end of the signal transmission circuit is connected to a wake-up pin of the power chip.
6. The DC charging signal processing circuit of claim 5, wherein the signal transmission circuit comprises a third diode, a third resistor, a fourth resistor and a second capacitor,
wherein, the anode of the third diode is used as the input end of the signal transmission circuit and is connected to the output end of the wake-up control circuit, the cathode of the third diode is connected to one end of the third resistor, the other end of the third resistor is grounded,
one end of the fourth resistor is connected to the cathode of the third diode, the other end of the fourth resistor is connected to the wake-up pin of the power supply chip as the output end of the signal transmission circuit,
one end of the second capacitor is connected to the other end of the fourth resistor, and the other end of the second capacitor is grounded.
7. The DC charging signal processing circuit of claim 1, further comprising a signal acquisition circuit,
the input end of the signal acquisition circuit is connected between the output end of the connection state detection circuit and the input end of the wake-up control circuit, and the output end of the signal acquisition circuit is connected to an input pin of the microcontroller.
8. The DC charging signal processing circuit of claim 7, wherein the signal acquisition circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second control switch,
wherein, one end of the fifth resistor is used as the input end of the signal acquisition circuit and is connected between the output end of the connection state detection circuit and the input end of the awakening control circuit, the other end of the fifth resistor is connected to one end of the sixth resistor, the other end of the sixth resistor is grounded,
the control end of the second control switch is connected to the other end of the fifth resistor, the first connection end of the second control switch is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to a power supply output pin of the power supply chip, the second connection end of the second control switch is grounded,
one end of the eighth resistor is connected to the one end of the seventh resistor, and the other end of the eighth resistor is connected to an input pin of the microcontroller as an output end of the signal acquisition circuit.
9. The dc charging signal processing circuit of claim 1, wherein the input terminal of the connection state detection circuit is configured to be connected to a positive terminal of a low-voltage auxiliary power signal of the external charging post.
10. A battery management system, characterized in that the battery management system comprises a dc charging signal processing circuit according to any of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122092757.6U CN216069689U (en) | 2021-08-31 | 2021-08-31 | Direct current charging signal processing circuit and battery management system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122092757.6U CN216069689U (en) | 2021-08-31 | 2021-08-31 | Direct current charging signal processing circuit and battery management system |
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