CN211335606U - Charging detection and wake-up circuit and battery management system - Google Patents
Charging detection and wake-up circuit and battery management system Download PDFInfo
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- CN211335606U CN211335606U CN201922141973.8U CN201922141973U CN211335606U CN 211335606 U CN211335606 U CN 211335606U CN 201922141973 U CN201922141973 U CN 201922141973U CN 211335606 U CN211335606 U CN 211335606U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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Abstract
A charging detection and wake-up circuit and a power management system generate a first control signal according to a first voltage through a first voltage division circuit; the first switch component outputs a first voltage according to a first control signal; the second voltage division circuit generates a second voltage according to the first voltage; the detection circuit generates a detection signal according to the connection confirmation signal access state of the charging gun; the second switch component outputs a first voltage according to the detection signal; the wake-up enabling circuit generates a wake-up enabling signal according to the first voltage output by the second switch component so as to wake up and activate the battery management system; the control switch component controls the first switch component to stop outputting the first voltage according to the control enabling signal generated by the battery management system controller after the battery management system is completely activated, one circuit is shared to realize charging connection confirmation signal detection and awaken the activated battery management system for charging, the detection and control precision is high, one detection loop is saved, the circuit structure is simple, and the cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of automotive electronics, especially, relate to a charge detection and wake-up circuit and battery management system.
Background
The battery management system can be divided into a working mode and a low power consumption mode from the working mode; when the battery management system is in a working mode, the battery management system is used for managing the charging and discharging process of the battery module; when the battery management system is in a low power consumption mode, the battery module is managed by the static process. After the battery management system enters the low power consumption mode, the charging gun is inserted, the Battery Management System (BMS) can be awakened in time and enters a working mode, the connection state of the charging gun is detected, and the battery module is charged after the completion of the confirmation, so that the safe and efficient charging and discharging process management of the battery module in the battery management system is realized, and the safety and reliability of charging equipment such as an electric vehicle are improved.
At present, in the traditional slow charging process of an automobile, a charging confirmation signal CP is generally used for awakening a battery management system from dormancy, the design requirements of partial finished automobile customers cannot be met in the process, an interface of a national standard charging gun is fixed, and a standard interface is not required to be added or changed to realize charging awakening because the interface is not used as a circuit interface for signal awakening independently. The battery management system is awakened from the sleep low power consumption to enter the working mode by using a connection confirmation signal (CC) of the charging gun, and the connection confirmation signal (CC) is not provided with power excitation generally, so that the battery management system needs to provide excitation, and meanwhile, the battery management system is awakened in the sleep state by needing high level, so that the mode of awakening the battery management system by using an unexcited signal is complex generally; and the circuit for waking up the charging by using the connection confirmation CC signal has the influence of a pulled-up power supply, and the accuracy and the reliability of the charging wake-up detection are poor due to the large error of the value of the CC detection.
Therefore, the conventional technical scheme has the problems that the charging wake-up circuit and the charging detection circuit cannot be shared, so that the circuit structure is complex, the cost is high, and the detection accuracy and reliability are poor.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a charge and detect and awaken circuit and battery management system aims at solving the awaken circuit and the detection circuitry that charges that exist among the traditional technical scheme and can not share, leads to circuit structure complicacy, with high costs, detects the poor problem of accuracy and reliability.
The utility model discloses a first aspect of the embodiment provides a charge and detects and wake-up circuit, include:
a first voltage dividing circuit configured to generate a first control signal according to a first voltage;
a first switch component connected with the first voltage division circuit and configured to output the first voltage according to the first control signal;
the second voltage division circuit is connected with the first switch component and is configured to generate a second voltage according to the first voltage;
the detection circuit is connected with the second voltage division circuit and is configured to generate a detection signal according to the connection confirmation signal access state of the charging gun;
a second switch element connected to the first switch element, the second voltage divider circuit, and the detection circuit, and configured to output the first voltage according to the detection signal;
the wake-up enabling circuit is connected with the second switch component and configured to generate a wake-up enabling signal according to the first voltage output by the second switch component so as to wake up and activate the battery management system;
and the control switch assembly is connected with the first voltage division circuit and the first switch assembly and is configured to control the first switch assembly to be switched off to output the first voltage according to a control enabling signal generated by a battery management system controller after the battery management system is completely activated.
In one embodiment, the charge detection and wake-up circuit further comprises:
a first current limiting protection circuit connected to the first switch component, the second switch component, and the second voltage dividing circuit, and configured to perform current limiting protection on the first voltage;
the second voltage division circuit is specifically configured to generate the second voltage according to the current-limited protected first voltage;
and the second current-limiting protection circuit is connected with the second voltage division circuit, the second switch assembly and the detection circuit and is configured to perform current-limiting protection on the second voltage.
In one embodiment, the wake-up enabling circuit includes:
the third voltage division circuit is connected with the second switch assembly and is configured to generate a third voltage according to the first voltage output by the second switch assembly;
a first rectifying circuit connected to the third voltage dividing circuit and configured to stabilize the third voltage;
the energy storage circuit is connected with the third voltage division circuit and the first rectifying circuit and is configured to stably store electric energy and release electric energy according to the stabilized third voltage so as to generate the awakening enabling signal;
the second rectifying circuit is connected with the energy storage circuit and is configured to carry out smooth rectification on the awakening enabling signal;
and the filter circuit is connected with the second rectifying circuit and is configured to filter and reduce noise of the wake-up enabling signal after smooth rectification.
In one embodiment, the first voltage divider circuit includes: a first resistor and a second resistor;
a first end of the first resistor is a first voltage input end of the first voltage division circuit, a second end of the first resistor is connected with a first end of the second resistor, and a second end of the second resistor is connected with a power ground;
the second end of the first resistor and the first end of the second resistor jointly constitute a first control signal output end of the first voltage division circuit.
In one embodiment, the first switch assembly comprises: a first field effect transistor;
the source electrode of the first field effect transistor is a first voltage input end of the first switch component, the grid electrode of the first field effect transistor is a first control signal input end of the first switch component, and the drain electrode of the first field effect transistor is a first voltage output end of the first switch component.
In one embodiment, the second switch assembly comprises: a second field effect transistor;
the source electrode of the second field effect transistor is a first voltage input end of the second switch component, the grid electrode of the second field effect transistor is a detection signal input end of the second switch component, and the drain electrode of the second field effect transistor is a first voltage output end of the second switch component.
In one embodiment, the detection circuit comprises a diode and a CC pin of a socket that interfaces with the charging gun; the charging gun comprises a third resistor R7;
the first end of the third resistor is connected with a CC pin of the charging gun, the second end of the third resistor is connected with a power ground, and the CC pin of the socket is connected with the cathode of the diode; and the anode of the diode is a detection signal output end of the detection circuit and a second voltage input end of the detection circuit.
In one embodiment, the wake-up enabling circuit includes: the first rectifier diode is connected with the first resistor, the second rectifier diode is connected with the second resistor, and the first capacitor is connected with the second capacitor;
the first end of the fourth resistor, the cathode of the first voltage stabilizing diode and the first end of the first capacitor are jointly formed into a first voltage input end of the wake-up enabling circuit;
a second end of the fourth resistor is connected with an anode of the second voltage stabilizing diode, an anode of the first freewheeling diode, a second end of the fifth resistor and a second end of the second capacitor to ground, an anode of the first voltage stabilizing diode is connected with a cathode of the second voltage stabilizing diode, a second end of the first capacitor is connected with an anode of the first rectifying diode and a cathode of the first freewheeling diode, and a cathode of the first rectifying diode is connected with a first end of the sixth resistor and a first end of the fifth resistor;
the second end of the sixth resistor and the first end of the second capacitor jointly form a wake-up enable signal output end of the wake-up enable circuit.
In one embodiment, the control switch assembly comprises: a first control switch;
the normally closed end of the first control switch is a first voltage input end of the control switch assembly, and the normally open end of the first control switch is a first voltage output end of the control switch assembly; the control end of the first control switch is a control enabling signal input end of the control switch assembly.
A second aspect of the embodiments of the present invention provides a battery management system, the battery management system includes the above-mentioned charge detection and wake-up circuit.
The charging detection and wake-up circuit controls the first switch component to be conducted to output a first voltage to the second switch component and the second voltage division circuit through the first voltage division circuit when the battery management system is not activated, the detection circuit detects the access state of a connection confirmation signal of the charging gun, generates a detection signal to control the second switch component to be conducted and output the first voltage to the wake-up enabling circuit when the connection confirmation signal of the charging gun is detected, and the wake-up enabling circuit generates a wake-up enabling signal according to the first voltage output by the second switch component to wake up and activate the battery management system so as to realize that the battery management with excitation is woken up by using the charging connection confirmation signal without excitation; meanwhile, after the battery management system is completely activated, an enabling control signal is generated to close the control switch assembly, so that the first switch assembly is controlled to stop outputting the first voltage, the detection circuit of the charging connection confirmation signal is disconnected, and high-precision detection of the charging connection confirmation signal is guaranteed; after the battery module (or the battery pack) is fully charged, when the charging gun is connected (namely, a charging connection confirmation signal is also present), the battery management system can be normally powered off to enter a dormant state, so that the electric quantity loss of a lead-acid battery working in the battery management system after the battery module (or the battery pack) is fully charged is reduced; the charging connection confirmation signal detection and the awakening charging function are realized by using the same circuit under the condition that a standard interface or a newly added interface is not changed, the two functions are not influenced mutually, a detection loop is saved, the circuit structure is simple, the cost is low, and the flexible design of the charging mode of the whole vehicle of a whole vehicle factory is met.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a charge detection and wake-up circuit provided in an embodiment of the present invention;
fig. 2 is another schematic structural diagram of a charging detection and wake-up circuit provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a wake-up enabling circuit according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an example circuit of a charging detection and wake-up circuit provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a schematic diagram of a charging detection and wake-up circuit according to an embodiment of the present invention shows only the relevant parts of the present embodiment for convenience of description, and the details are as follows:
the utility model discloses a first aspect of the embodiment provides a charge and detects and wake-up circuit, include: a first voltage dividing circuit 11, a first switch component 12, a second voltage dividing circuit 13, a detection circuit 14, a second switch component 15, a wake-up enabling circuit 16 and a control switch component 17.
A first voltage dividing circuit 11 configured to generate a first control signal according to a first voltage; a first switching element 12 connected to the first voltage divider 11 and configured to output a first voltage according to a first control signal; a second voltage dividing circuit 13 connected to the first switching element 12 and configured to generate a second voltage according to the first voltage; a detection circuit 14 connected to the second voltage dividing circuit 13 and configured to generate a detection signal according to an access state of a connection confirmation signal of the charging gun; a second switch element 15 connected to the first switch element 12, the second voltage divider circuit 13, and the detection circuit 14, and configured to output a first voltage according to a detection signal; a wake-up enabling circuit 16 connected to the second switch component 15 and configured to generate a wake-up enabling signal according to the first voltage output by the second switch component 15 to wake up and activate the battery management system; and a control switch assembly 17, connected to the first voltage dividing circuit 11 and the first switch assembly 12, and configured to control the first switch assembly 12 to turn off to output the first voltage according to a control enable signal generated by the battery management system controller 100 after the battery management system is fully activated.
In one embodiment, the detection circuit 14 may optionally include a socket or connector for interfacing with a charging gun, for connecting an external charging gun, when the charging gun is connected with the battery management system, the detection circuit 14 connects the second voltage outputted by the second voltage division circuit 13 to the power ground, and correspondingly generates a detection signal, the second switch component 15 is turned on according to the detection signal to output a first voltage, the wake-up enable circuit 16 generates a wake-up enable signal according to the first voltage output by the second switch component 15 to wake up and activate the battery management system, and the control switch component 17 pulls up the level of the first control signal according to the control enable signal generated by the battery management system controller 100 after the battery management system is completely activated to control the first switch component 12 to turn off and output the first voltage, thereby disconnecting the detection circuit of the connection confirmation signal (CC) (i.e., the charging connection confirmation signal (CC)).
Optionally, the first switch component 12 is turned on according to the first control signal at the first level to output the first voltage, and the first switch component 12 is turned off according to the first control signal at the second level to turn off the output of the first voltage; the second switching element 15 is turned on according to the detection signal of the first level to output the first voltage, and the second switching element 15 is turned off according to the detection signal of the second level to turn off the output of the first voltage. Optionally, the first level is a low level, and the second level is a high level.
In specific implementation, the time for completely waking up and activating the battery management system can be adjusted by the wake-up enabling circuit 16, so that the wake-up and activation time is controllable, and the safety reliability and the precision of the charging connection detection and wake-up circuit are improved. In the process of activating and awakening the battery management system to charge the battery module (or the battery pack), the influence of the detection circuit for connecting the confirmation signal (CC) on the charging of the battery management system on the battery module (or the battery pack) can be effectively isolated through the coupling isolation component in the awakening enabling circuit 16, so that after the battery module (or the battery pack) is fully charged, when the charging gun is connected, the battery management system can be normally powered off to enter a dormant state, the low power consumption state of the battery management system is ensured, and the electric quantity loss of a working lead-acid battery in the battery management system after the battery module (or the battery pack) is fully charged is reduced. Meanwhile, the control switch assembly 17 can control the first switch assembly 12 to cut off the output of the first voltage after the battery management system is completely activated, so that the detection circuit of the charging connection confirmation signal is disconnected, and high-precision detection of the charging connection confirmation signal is ensured.
Referring to fig. 2, in one embodiment, the charge detection and wake-up circuit further includes: a first current limiting protection circuit 18 and a second current limiting protection circuit 19.
A first current limiting protection circuit 18 connected to the first switch element 12, the second switch element 15, and the second voltage dividing circuit 13, and configured to current-limit-protect the first voltage; the second voltage dividing circuit 13 is specifically configured to generate a second voltage from the current-limited first voltage; the second current limiting protection circuit 19 is connected to the second voltage dividing circuit 13, the second switching element 15, and the detection circuit 14, and configured to current-limit-protect the second voltage.
In specific implementation, the first current-limiting protection circuit 18 and the second current-limiting protection circuit 19 can prevent the circuit components from being damaged due to overlarge current flowing through the second switch assembly 15 and other circuit components, and improve the safety of the charging detection and wake-up circuit. Meanwhile, the first current-limiting protection circuit 18, the second current-limiting protection circuit 19 and the second voltage-dividing circuit 13 can also effectively divide the first voltage, so that the voltage applied to the detection circuit 14 and the voltage applied to the second switch component 15 reach a stable and reliable range, and the precision and reliability of detecting the connection confirmation signal (CC) of the charging gun are improved.
Referring to fig. 3, in one embodiment, the wake-up enabling circuit 16 includes: a third voltage dividing circuit 161, a first rectifying circuit 162, a tank circuit 163, a second rectifying circuit 164, and a filter circuit 165.
A third voltage dividing circuit 161 connected to the second switch element 15 and configured to generate a third voltage according to the first voltage output by the second switch element 15; a first rectifying circuit 162 connected to the third voltage dividing circuit 161 and configured to stabilize the third voltage; a tank circuit 163 connected to the third voltage divider circuit 161 and the first rectifier circuit 162, and configured to smoothly store and release electric energy according to the regulated third voltage to generate a wake-up enable signal; a second rectifying circuit 164 connected to the energy storage circuit 163 and configured to smoothly rectify the wake-up enable signal; and a filter circuit 165 connected to the second rectifying circuit 164 and configured to filter and reduce noise of the smoothed and rectified wake-up enable signal.
In a specific implementation, the third voltage dividing circuit 161 generates a third voltage according to the first voltage output by the second switching component 15, and the first rectifying circuit 162 stabilizes the third voltage to output a stable third voltage to the energy storage circuit 163. The energy storage circuit 163 charges according to the stable and low-ripple-noise third voltage to store electric energy and discharges to release electric energy to generate a wake-up enabling signal, the second rectification circuit 164 performs smooth rectification on the wake-up enabling signal to filter ripple pulse interference in the wake-up enabling signal, the filter circuit 165 performs further filtering and noise reduction on the wake-up enabling signal after smooth rectification, so that the wake-up enabling circuit 16 outputs the stable and low-noise-interference wake-up enabling signal to wake up and activate the battery management system, and the charging detection and wake-up circuit has high detection and control precision and is safe and reliable.
Referring to fig. 4, in one embodiment, the first voltage divider circuit 11 includes: a first resistor R3 and a second resistor R4.
A first terminal of the first resistor R3 is a first voltage input terminal of the first voltage divider circuit 11, a second terminal of the first resistor R3 is connected to a first terminal of the second resistor R4, and a second terminal of the second resistor R4 is connected to ground. The second terminal of the first resistor R3 and the first terminal of the second resistor R4 are commonly configured as a first control signal output terminal of the first voltage divider circuit 11.
Referring to fig. 4, in one embodiment, the first switch assembly 12 includes: a first field effect transistor Q2.
The source of the first fet Q2 is a first voltage input terminal of the first switching element 12, the gate of the first fet Q2 is a first control signal input terminal of the first switching element 12, and the drain of the first fet Q2 is a first voltage output terminal of the first switching element 12.
Referring to fig. 4, in one embodiment, the second switch assembly 15 includes: and a second field effect transistor Q1.
The source of the second fet Q1 is a first voltage input terminal of the second switching element 15, the gate of the second fet Q1 is a detection signal input terminal of the second switching element 15, and the drain of the second fet Q1 is a first voltage output terminal of the second switching element 15.
Referring to fig. 4, in one embodiment, the detection circuit 14 includes a CC pin CC2 and a diode D1 of a socket S1A for interfacing with the charging gun; the charging gun includes a third resistor R7.
The first end of the third resistor R7 is connected to the CC pin CC1 of the charging gun, the second end of the third resistor R7 is connected to the power ground, the CC pin CC2 of the socket S1A is connected to the cathode of the diode D1, and the anode of the diode D1 is the detection signal output terminal of the detection circuit 14 and the second voltage input terminal of the detection circuit 14.
Referring to fig. 4, in one embodiment, the wake-up enabling circuit 16 includes: the circuit comprises a fourth resistor R2, a fifth resistor R8, a sixth resistor R9, a first voltage stabilizing diode D2, a second voltage stabilizing diode D4, a first rectifying diode D5, a first freewheeling diode D3, a first capacitor C1 and a second capacitor C2.
A first terminal of the fourth resistor R2, a cathode of the first zener diode D2, and a first terminal of the first capacitor C1 are commonly configured as a first voltage input terminal of the wake-up enable circuit 16.
A second terminal of the fourth resistor R2 is connected to an anode of the second zener diode D4, an anode of the first freewheeling diode D3, a second terminal of the fifth resistor R8, and a second terminal of the second capacitor C2, to the power ground, an anode of the first zener diode D2 is connected to a cathode of the second zener diode D4, a second terminal of the first capacitor C1 is connected to an anode of the first rectifying diode D5 and a cathode of the first freewheeling diode D3, and a cathode of the first rectifying diode D5 is connected to a first terminal of the sixth resistor R9 and a first terminal of the fifth resistor R8.
The second terminal of the sixth resistor R9 and the first terminal of the second capacitor C2 together form a wake-up enable signal output terminal of the wake-up enable circuit 16.
Referring to fig. 4, in one embodiment, the control switch assembly 17 includes: a first control switch S2A.
The normally closed end of the first control switch S2A is the first voltage input end of the control switch module 17, the normally open end of the first control switch S2A is the first voltage output end of the control switch module 17, and the control end of the first control switch S2A is the control enable signal input end of the control switch module 17.
In a specific implementation, the detection circuit 14 may further include a connector, and the connector is connected to the CC pin of the charging gun through the CC pin of the connector. When an external charging gun is plugged into the battery management system, the connector is in butt joint with the charging gun, a second voltage is communicated, and a detection signal is correspondingly generated; when the external charging gun is not plugged into the battery management system, the connector is disconnected, the second voltage is cut off, and the detection of the connection confirmation signal of the charging gun is realized.
In one embodiment, the first capacitor C1 is a coupling isolation capacitor, and can store power to generate a high wake-up enable signal and isolate dc power. The first current limiting protection circuit 18 includes a seventh resistor R6, the second current limiting protection circuit 19 includes an eighth resistor R1, and the second voltage divider circuit 13 includes a ninth resistor R10. The seventh resistor R6, the eighth resistor R1 and the ninth resistor R10 may also form a voltage divider circuit in the detection circuit of the charging connection confirmation signal (CC), and by adjusting the resistances of the three resistors, the voltage applied to the third resistor R7 can be adjusted to output a proper voltage, so as to improve the detection accuracy of the charging connection confirmation signal.
Specifically, the third voltage dividing circuit 161 includes a fourth resistor R2, the first rectifying circuit 162 includes a first zener diode D2 and a second zener diode D4, the energy storage circuit 163 includes a first capacitor C1 and a first freewheeling diode D3, the second rectifying circuit 164 includes a first rectifying diode D5, and the filter circuit 165 includes a fifth resistor R8, a sixth resistor R9, and a second capacitor C2. The first field effect transistor Q2 and the second field effect transistor Q1 are both P-type transistors.
The working principle of the charge detection and wake-up circuit will be briefly described below with reference to fig. 4:
when the charging gun is not plugged into the battery management system, that is, when the charging gun comprising the third resistor R7 is not plugged into the battery management system, the socket S1A butted with the charging gun is disconnected, the gate of the second field effect transistor Q1 is a high-level detection signal, the second field effect transistor Q1 is turned off to output a first voltage, the wake-up enabling circuit 16 does not generate a wake-up enabling signal to wake up and activate the battery management system, and the battery management system is in a low-power consumption sleep state; the first field effect transistor Q2 is closed under the control of the first voltage dividing circuit 11, outputting a first voltage.
When the charging gun is plugged into the battery management system, the socket S1A butted with the charging gun is communicated, the grid of the second field-effect tube Q1 is a low-level detection signal, so that the second field-effect tube Q1 is conducted to output a first voltage, the positive pole of the first voltage-stabilizing diode D2 jumps to a high-level state, and a wake-up enabling signal is generated after the positive pole of the first voltage-stabilizing diode D2 passes through the first capacitor C1, the first freewheeling diode D3, the first rectifying diode D5, the sixth resistor R9 and the second capacitor C2 to wake up and activate the battery management system; the first voltage output by the second field effect transistor Q1 is divided by the fourth resistor R2 and then output to the first capacitor C1 for charging, and the first capacitor C1 and the first freewheeling diode D3 are used for stably storing and releasing electric energy, so that the time for waking up and activating the battery management system is controllable, and the time requirement for the battery management system to be activated and initialized can be met by adjusting the parameters of each electronic component in the wake-up enabling circuit 16; the awakening enabling signal is subjected to smooth rectification through the first rectifying tube D5, is subjected to filtering and noise reduction through the fifth resistor R8, the sixth resistor R9 and the second capacitor C2 and is output to the battery management system, and the stability and reliability of the awakening and activating battery management system are improved; after the battery management system is completely activated, the battery management system controller 100 generates a control enabling signal to control the first control switch S2A to be switched from a normally open state to a closed state, so that the first control signal is switched from a low level to a high level, the first field effect transistor Q2 is controlled to be cut off to output a first voltage, a detection circuit of a connection confirmation signal (CC) of the charging gun is further turned off, and high-precision detection of the charging connection confirmation signal is guaranteed.
A second aspect of the embodiments of the present invention provides a battery management system, which comprises the above-mentioned charging detection and wake-up circuit.
The embodiment of the utility model provides a can realize adopting the charging connection affirmation signal (CC) of no excitation to carry out the battery management of excitation and awakening up, simultaneously after awakening up the battery management system and charging, can break off the detection circuitry of charging connection affirmation signal, guaranteed the high accuracy detection to charging connection affirmation signal (CC); meanwhile, after the battery management system is fully charged, when the charging gun is connected, the battery management system can be normally powered off to enter a dormant state, so that the electric quantity loss of a lead-acid battery working in the battery management system after the battery management system is fully charged is reduced; the charging connection confirmation signal detection and the charging awakening function of the battery management system are realized by using the same circuit under the condition that a standard interface or a newly added interface is not changed, the two functions are not influenced mutually, the circuit structure is simple, components are saved, the cost is reduced, and the flexible design of the charging mode of the whole vehicle of a whole vehicle factory is met.
Various embodiments of various devices, circuits, systems are described herein. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
The particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Thus, a particular feature, structure, or characteristic illustrated or described in connection with one embodiment may be combined, in whole or in part, with features, structures, or characteristics of one or more other embodiments without presuming that such combination is not an illogical or functional limitation. Although certain embodiments have been described above with a certain degree of particularity, those skilled in the art could make numerous alterations to the disclosed embodiments without departing from the scope of this disclosure. Joinder references (e.g., attached, coupled, connected, and the like) are to be construed broadly and may include intermediate members between a connection of elements and relative movement between elements. Thus, connection references do not necessarily imply that two elements are directly connected/coupled and in a fixed relationship to each other. The use of "for example" throughout this specification should be interpreted broadly and used to provide non-limiting examples of embodiments of the disclosure, and the disclosure is not limited to such examples. It is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative only and not limiting. Changes in detail or structure may be made without departing from the disclosure. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A charge detection and wake-up circuit, comprising:
a first voltage dividing circuit configured to generate a first control signal according to a first voltage;
a first switch component connected with the first voltage division circuit and configured to output the first voltage according to the first control signal;
the second voltage division circuit is connected with the first switch component and is configured to generate a second voltage according to the first voltage;
the detection circuit is connected with the second voltage division circuit and is configured to generate a detection signal according to the connection confirmation signal access state of the charging gun;
a second switch element connected to the first switch element, the second voltage divider circuit, and the detection circuit, and configured to output the first voltage according to the detection signal;
the wake-up enabling circuit is connected with the second switch component and configured to generate a wake-up enabling signal according to the first voltage output by the second switch component so as to wake up and activate the battery management system;
and the control switch assembly is connected with the first voltage division circuit and the first switch assembly and is configured to control the first switch assembly to be switched off to output the first voltage according to a control enabling signal generated by a battery management system controller after the battery management system is completely activated.
2. The charge detection and wake-up circuit of claim 1, wherein the charge detection and wake-up circuit further comprises:
a first current limiting protection circuit connected to the first switch component, the second switch component, and the second voltage dividing circuit, and configured to perform current limiting protection on the first voltage;
the second voltage division circuit is specifically configured to generate the second voltage according to the current-limited protected first voltage;
and the second current-limiting protection circuit is connected with the second voltage division circuit, the second switch assembly and the detection circuit and is configured to perform current-limiting protection on the second voltage.
3. The charge detection and wake-up circuit of claim 1, wherein the wake-up enable circuit comprises:
the third voltage division circuit is connected with the second switch assembly and is configured to generate a third voltage according to the first voltage output by the second switch assembly;
a first rectifying circuit connected to the third voltage dividing circuit and configured to stabilize the third voltage;
the energy storage circuit is connected with the third voltage division circuit and the first rectifying circuit and is configured to stably store electric energy and release electric energy according to the stabilized third voltage so as to generate the awakening enabling signal;
the second rectifying circuit is connected with the energy storage circuit and is configured to carry out smooth rectification on the awakening enabling signal;
and the filter circuit is connected with the second rectifying circuit and is configured to filter and reduce noise of the wake-up enabling signal after smooth rectification.
4. The charge detection and wake-up circuit of claim 1, wherein the first voltage divider circuit comprises: a first resistor and a second resistor;
a first end of the first resistor is a first voltage input end of the first voltage division circuit, a second end of the first resistor is connected with a first end of the second resistor, and a second end of the second resistor is connected with a power ground;
the second end of the first resistor and the first end of the second resistor jointly constitute a first control signal output end of the first voltage division circuit.
5. The charge detection and wake-up circuit of claim 1, wherein the first switching component comprises: a first field effect transistor;
the source electrode of the first field effect transistor is a first voltage input end of the first switch component, the grid electrode of the first field effect transistor is a first control signal input end of the first switch component, and the drain electrode of the first field effect transistor is a first voltage output end of the first switch component.
6. The charge detection and wake-up circuit of claim 1, wherein the second switching component comprises: a second field effect transistor;
the source electrode of the second field effect transistor is a first voltage input end of the second switch component, the grid electrode of the second field effect transistor is a detection signal input end of the second switch component, and the drain electrode of the second field effect transistor is a first voltage output end of the second switch component.
7. The charge detection and wake-up circuit of claim 1, wherein the detection circuit comprises a diode and a CC pin of a socket that interfaces with the charge gun; the charging gun comprises a third resistor R7;
the first end of the third resistor is connected with a CC pin of the charging gun, the second end of the third resistor is connected with a power ground, and the CC pin of the socket is connected with the cathode of the diode; and the anode of the diode is a detection signal output end of the detection circuit and a second voltage input end of the detection circuit.
8. The charge detection and wake-up circuit of claim 1, wherein the wake-up enable circuit comprises: the first rectifier diode is connected with the first resistor, the second rectifier diode is connected with the second resistor, and the first capacitor is connected with the second capacitor;
the first end of the fourth resistor, the cathode of the first voltage stabilizing diode and the first end of the first capacitor are jointly formed into a first voltage input end of the wake-up enabling circuit;
a second end of the fourth resistor is connected with an anode of the second voltage stabilizing diode, an anode of the first freewheeling diode, a second end of the fifth resistor and a second end of the second capacitor to ground, an anode of the first voltage stabilizing diode is connected with a cathode of the second voltage stabilizing diode, a second end of the first capacitor is connected with an anode of the first rectifying diode and a cathode of the first freewheeling diode, and a cathode of the first rectifying diode is connected with a first end of the sixth resistor and a first end of the fifth resistor;
the second end of the sixth resistor and the first end of the second capacitor jointly form a wake-up enable signal output end of the wake-up enable circuit.
9. The charge detection and wake-up circuit of claim 1, wherein the control switch component comprises: a first control switch;
the normally closed end of the first control switch is a first voltage input end of the control switch assembly, and the normally open end of the first control switch is a first voltage output end of the control switch assembly; the control end of the first control switch is a control enabling signal input end of the control switch assembly.
10. A battery management system comprising the charge detection and wake-up circuit of any of claims 1 to 9.
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| CN201922141973.8U CN211335606U (en) | 2019-12-03 | 2019-12-03 | Charging detection and wake-up circuit and battery management system |
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| CN201922141973.8U CN211335606U (en) | 2019-12-03 | 2019-12-03 | Charging detection and wake-up circuit and battery management system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112615407A (en) * | 2020-12-15 | 2021-04-06 | 潍柴动力股份有限公司 | BMS charging wake-up circuit, power supply method and system |
| CN112895924A (en) * | 2019-12-03 | 2021-06-04 | 恒大新能源技术(深圳)有限公司 | Charging detection and wake-up circuit and battery management system |
| CN113675912A (en) * | 2021-07-29 | 2021-11-19 | 歌尔科技有限公司 | Charging interface detection circuit, intelligent wearable device, charging device and system |
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2019
- 2019-12-03 CN CN201922141973.8U patent/CN211335606U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112895924A (en) * | 2019-12-03 | 2021-06-04 | 恒大新能源技术(深圳)有限公司 | Charging detection and wake-up circuit and battery management system |
| CN112615407A (en) * | 2020-12-15 | 2021-04-06 | 潍柴动力股份有限公司 | BMS charging wake-up circuit, power supply method and system |
| CN113675912A (en) * | 2021-07-29 | 2021-11-19 | 歌尔科技有限公司 | Charging interface detection circuit, intelligent wearable device, charging device and system |
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