CN110626206A - Charging wake-up device and battery system - Google Patents

Charging wake-up device and battery system Download PDF

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Publication number
CN110626206A
CN110626206A CN201810551655.6A CN201810551655A CN110626206A CN 110626206 A CN110626206 A CN 110626206A CN 201810551655 A CN201810551655 A CN 201810551655A CN 110626206 A CN110626206 A CN 110626206A
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CN
China
Prior art keywords
voltage
low
wake
module
signal
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Granted
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CN201810551655.6A
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Chinese (zh)
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CN110626206B (en
Inventor
史德龙
但志敏
王连松
侯贻真
张伟
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Contemporary Amperex Technology Co Ltd
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Contemporary Amperex Technology Co Ltd
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Priority to CN201810551655.6A priority Critical patent/CN110626206B/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0063Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/70Energy storage systems for electromobility, e.g. batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/12Electric charging stations
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10Technologies relating to charging of electric vehicles
    • Y02T90/16Information or communication technologies improving the operation of electric vehicles

Abstract

The embodiment of the invention provides a charging wake-up device and a battery system, wherein the charging wake-up device comprises a wake-up module, a control module and a power supply conversion module; when the battery management system is in a dormant state, the input end of the wake-up module is used for receiving a low-voltage input signal and generating a wake-up signal according to the low-voltage input signal, and the control module is used for receiving the wake-up signal, outputting an initial signal for starting working to the power battery according to the wake-up signal and controlling the power supply conversion module to supply power to the battery management system. In the embodiment of the invention, in the dormancy process of the battery management system, when a charging signal exists at the low-voltage charging port, the high-voltage electricity of the power battery can be used for supplying power to the battery management system, so that the battery management system can work normally, and the loss of the lead-acid battery is reduced, thereby ensuring the normal operation of the BMS when the lead-acid battery is not arranged on a vehicle or is damaged.

Description

Charging wake-up device and battery system
Technical Field
The invention relates to the technical field of battery equipment, in particular to a charging wake-up device and a battery system.
Background
At present, in the face of the current situations of energy shortage and increasingly serious environmental pollution, a pure electric new energy automobile becomes an important way for reducing automobile exhaust emission, energy consumption and relieving environmental pressure, so that the development of the pure electric new energy automobile is imperative. Different from the traditional fuel oil automobile, the electrical system of the new energy electric automobile comprises a high-voltage electrical system and a low-voltage electrical system, and generally, the high voltage is composed of a power battery system, a driving control system and the like and is used for driving the automobile; and the low-voltage system is used for providing electric energy for various controllers, headlights, windscreen wipers, instruments and the like. Because there are a lot of high-voltage power consumption devices on the new energy automobile, in order to guarantee user's safety, prevent to take place the danger of indirect electric shock, generally keep apart high-voltage side and low-voltage side through the transformer.
A Battery Management System (BMS), which is a key technology in Battery Management of electric vehicles, plays an important role in managing and monitoring the state of Battery modules of electric vehicles, and performs charge and discharge protection of the Battery modules while monitoring the remaining capacity of the Battery modules. When BMS is in the dormancy state, charge the vehicle, need awaken up BMS earlier, make it get into operating condition. Among the prior art, generally need set up the lead acid battery who supplies power to the BMS specially in the vehicle, but do not set up lead acid battery in the vehicle, perhaps when lead acid battery damages, the BMS system then can't normally work, perhaps when being provided with lead acid battery in the vehicle, charging process all needs lead acid battery to supply power for the BMS system at every turn, has increased lead acid battery's loss.
Therefore, a new wake-up device and a new battery system are needed.
Disclosure of Invention
The embodiment of the invention provides a charging wake-up device and a battery system, which can still ensure the normal operation of a BMS system when a lead-acid battery is not arranged or is damaged.
The embodiment of the invention provides a charging wake-up device on one hand, which comprises a wake-up module, a control module and a power supply conversion module; the input end of the wake-up module is connected with the low-voltage charging port, the output end of the wake-up module is connected with the input end of the control module, the input end of the control module is also connected with the output end of the power battery, the output end of the control module is connected with the input end of the power conversion module, the input end of the power conversion module is also connected with the output end of the power battery, and the output end of the power conversion module is connected with the input end of the battery management system; when the battery management system is in a dormant state, the input end of the wake-up module is used for receiving a low-voltage input signal and generating a wake-up signal according to the low-voltage input signal, and the control module is used for receiving the wake-up signal, outputting an initial signal for starting working to the power battery according to the wake-up signal and controlling the power supply conversion module to supply power to the battery management system.
According to an aspect of the invention, further comprising:
the input end of the detection module is connected with the low-voltage charging port, and the output end of the detection module is connected with the input end of the awakening module;
the detection module is used for detecting a voltage signal of the low-voltage charging port, and if the low-voltage charging port has a preset voltage, the detection module sends a low-voltage input signal to the awakening module.
According to one aspect of the present invention, a detection module includes a low voltage controller and a first switching unit;
the input end of the low-voltage controller is connected with the low-voltage charging port, the output end of the low-voltage controller is connected with the input end of the first switch unit, and the output end of the first switch unit is connected with the input end of the awakening module;
the low-voltage controller is used for detecting the charging voltage of the low-voltage charging port, and if the low-voltage charging port has a preset voltage, the low-voltage controller sends a low-voltage input signal to the awakening module through the first switch unit.
According to one aspect of the invention, the detection module further comprises: the input and the low pressure of stabiliser charge mouthful and connect, and the output and the input of low pressure controller of stabiliser are connected, and the stabiliser is used for carrying out steady voltage to the voltage signal of low pressure charge mouthful and handles.
According to one aspect of the invention, a wake-up module includes a first transformer and a first diode;
the first transformer comprises a first primary side and a first secondary side which are isolated from each other, the first primary side is connected between the low-voltage charging port and the first switch unit, one end of the first secondary side is grounded, and the other end of the first secondary side is connected with the positive electrode of the first diode, so that when the first switch unit is connected or disconnected, the first transformer converts a low-voltage input signal into a wake-up signal through the first primary side and the first secondary side;
and the cathode of the first diode is connected with the input end of the control module.
According to one aspect of the invention, a control module includes a high voltage controller and a second switching unit;
the input end of the high-voltage controller is connected with the output end of the power battery and the output end of the awakening module, the output end of the high-voltage controller is connected with the input end of the second switch unit, and the output end of the second switch unit is connected with the input end of the power conversion device;
the high-voltage controller is used for receiving the wake-up signal, generating an initial signal according to the wake-up signal and controlling the power supply conversion module to supply power to the battery management system.
According to an aspect of the present invention, the power conversion module further includes a second transformer and a second diode;
the second transformer comprises a second primary side and a second secondary side which are isolated from each other, the second primary side is connected between the output end of the power battery and the output end of the second switch unit, one end of the second secondary side is grounded, and the other end of the second secondary side is connected with the anode of the second diode, so that when the second switch unit is connected or disconnected, the second transformer converts the high-voltage electricity of the power battery into low-voltage electricity through the second primary side and the second secondary side;
and the cathode of the second diode is connected with the input end of the battery management system.
According to one aspect of the invention, the power supply further comprises an absorption circuit, wherein the absorption circuit is connected in parallel to two ends of the second primary side and is used for clamping the voltage of the two ends of the second primary side.
According to an aspect of the present invention, the snubber circuit includes a third diode, a fifth resistor, and a sixth capacitor connected in series with each other;
the fifth resistor and the sixth capacitor are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the second primary side, and the other end of the parallel circuit is connected with the negative electrode of the third diode;
and the anode of the third diode is connected with the other end of the second primary side.
A second embodiment of the present invention further provides a battery system, including the above-mentioned charge wake-up device.
In the embodiment of the present invention, when a Battery Management System (BMS) is in a sleep state to charge a vehicle, a low voltage input signal is generated at a low voltage charging port, a wake-up module can receive the low voltage input signal from the low voltage charging port and generate a wake-up signal according to the input signal, a control module can control a power Battery to start operating according to the wake-up signal and control a power conversion module to supply power to the BMS, and the power conversion module can convert high voltage of the power Battery into low voltage and supply power to the BMS, so that the embodiment of the present invention can supply power to the BMS by using the high voltage of the power Battery when the vehicle is charged during the sleep of the BMS, so that the BMS normally operates, the loss of the lead-acid Battery is reduced, and the normal operation of the BMS can still be guaranteed when the lead-acid Battery is not provided or is damaged, meanwhile, the vehicle provided with the charging wake-up device provided by the embodiment of the invention can ensure the normal operation of the BMS without arranging a lead-acid battery, so that the production cost of the vehicle is further reduced.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
Fig. 1 is a schematic structural diagram of a charging wake-up apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an exemplary charging wake-up apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an exemplary charging wake-up apparatus according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The directional terms appearing in the following description are intended to be illustrative in all directions, and are not intended to limit the specific construction of embodiments of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
The input and output referred to hereinafter do not represent the actual current flow direction but merely the flow direction of the electrical control signal. The electrical control signal can be output by the output end of the module, and can also be input into the module by the input end of the module. The electrical control signals include electrical control signals such as a low voltage input signal, a wake-up signal, an origination signal, etc., as described below.
For better understanding of the present invention, the following describes in detail a charge wake-up device and a battery system according to an embodiment of the present invention with reference to fig. 1 to 3.
Fig. 1 is a charging wake-up apparatus according to an embodiment of the present invention, which includes a wake-up module P2, a control module P3, and a power conversion module P4; the input end of a wake-up module P2 is connected with a low-voltage charging port P0, the output end of a wake-up module P2 is connected with the input end of a control module P3, the input end of the control module P3 is also connected with the output end of a power battery P5, the output end of a control module P3 is connected with the input end of a power conversion module P4, the input end of the power conversion module P4 is also connected with the output end of a power battery P5, and the output end of the power conversion module P4 is connected with the input end of a battery management system P6; when the battery management system P6 is in the sleep state, the input terminal of the wake-up module P2 is configured to receive a low-voltage input signal and generate a wake-up signal according to the low-voltage input signal, and the control module P3 is configured to receive the wake-up signal, output an initial signal for starting to operate to the power battery P5 according to the wake-up signal, and control the power conversion module P4 to supply power to the battery management system P6.
The power conversion module P4 can convert the high voltage of the power battery P5 into low voltage power, so as to provide the low voltage power for the battery management system P6.
In the embodiment of the present invention, the battery management system P6 is in a sleep state, when the vehicle is charged, the low-voltage charging port generates an input signal, the wake-up module P2 receives the low-voltage input signal of the low-voltage charging port P0 and generates a wake-up signal according to the input signal, the control module P3 controls the power battery P5 to start operating according to the wake-up signal and controls the power conversion module P4 to supply power to the battery management system P6, and the power conversion module P4 converts the high-voltage power of the power battery P5 into a low-voltage power and supplies power to the battery management system P6. Therefore, when the battery management system P6 is charged in the sleeping process, the embodiment of the invention can utilize the high voltage of the power battery P5 to supply power to the battery management system P6, so that the battery management system P6 works normally, the loss of the lead-acid battery is reduced, and when the vehicle is not provided with the lead-acid battery or the lead-acid battery is damaged, the normal operation of the battery management system P6 can still be ensured, and meanwhile, the vehicle provided with the charging wake-up device of the embodiment of the invention can ensure the normal operation of the battery management system P6 without the lead-acid battery, so that the production cost of the vehicle is further reduced.
In some optional embodiments, the charging wake-up apparatus further includes a detection module P1, an input terminal of the detection module P1 is connected to the low-voltage charging port P0, an output terminal of the detection module P1 is connected to an input terminal of the wake-up module P2, and the detection module P1 is configured to detect a voltage signal of the low-voltage charging port P0, and send a low-voltage input signal to the wake-up module P2 if a preset voltage exists at the low-voltage charging port P0.
In these alternative embodiments, the wake-up module P2 is connected to the low-voltage charging port P0 through the detection module P1, and the detection module P1 can detect the voltage signal of the low-voltage charging port P0 and send a low-voltage input signal to the wake-up module P2 when a preset voltage is present at the low-voltage charging port P0, that is, when the low-voltage charging port P0 is charging. The preset voltage can be set according to actual requirements, for example, the preset voltage is 12V, 24V, 48V, and the like.
The detection module P1 can be arranged in various ways, and as an alternative embodiment, the detection module P1 comprises a low voltage controller and a first switch unit M1(ii) a The input terminal of the low-voltage controller is connected with the low-voltage charging port P0, and the output terminal of the low-voltage controller is connected with the first switch unit M1Is connected to the input terminal of the first switching unit M1Is connected with the input end of the awakening module P2; the low voltage controller is used for detecting the charging voltage of the low voltage charging port P0, and if the preset voltage exists in the low voltage charging port P0, the preset voltage passes through the first switch unit M1A low voltage input signal is sent to the wake-up module P2.
In these alternative embodiments, the low voltage controller is used to detect the charging voltage of the low voltage charging port P0, and the first switching unit M1The circuit of the low-voltage controller can be disconnected or connected.
As shown in fig. 2, it can be understood that a voltage stabilizer may be further disposed between the low voltage charging port P0 and the input end of the low voltage controller, the input end of the voltage stabilizer is connected to the low voltage charging port P0, the output end of the voltage stabilizer is connected to the input end of the low voltage controller, the voltage stabilizer is configured to receive the voltage of the low voltage charging port P0, and stabilize the voltage of the low voltage charging port P0 into a stable voltage signal, so that the voltage signal of the low voltage charging port received by the low voltage controller is more stable, which is beneficial to the efficient and stable operation of the charge wake-up device.
Further, in order to improve the stability of the signal that the stabiliser obtained, still be provided with first filter circuit, first filter circuit's input and low voltage charge mouthful P0 are connected, and first filter circuit's output is connected with the stabiliser, and first filter circuit can filter the voltage signal that low voltage charge mouthful P0 was input to further improve the stability of signal. The output terminal of the first filter circuit is also connected to the input terminal of the wake-up module P2.
As shown in FIG. 3, the first filter circuit may be arranged in various ways, for example, the first filter circuit includes a first inductor L1A first capacitor C1And a second capacitor C2For example, the first filter circuit may filter the voltage signal of the low-voltage charging port P0.
The low-voltage controller may be arranged in various ways, for example, the low-voltage controller may select a Flyback control chip, or another suitable control chip, as long as the control chip can receive the voltage signal at the low-voltage charging port P0 and convert the voltage signal at the low-voltage charging port P0 into a low-voltage input signal. First switch unit M1There are various arrangements of, for example, the first switching unit M1Is a switching device.
In some alternative embodiments, the wake-up module P2 includes a first transformer Nps1And a first diode D1First transformer Nps1Comprises a first primary side and a first secondary side which are isolated from each other, wherein the first primary side is connected with a low-voltage charging port P0 and a first switch unit M1One end of the first secondary side is grounded, the other end of the first secondary side and the first diode D1So that when the first switching unit M is turned on1When connected or disconnected, the first transformer Nps1Converting a low-voltage input signal into a wake-up signal through a first primary side and a first secondary side; first diode D1Is connected to the input of the control module P3.
When the charging wake-up device is provided with the first filter circuit, one end of the first primary side is connected to the low-voltage charging port P0 through the first filter circuit.
In these alternative embodiments, in the first switching unit M1In the process of connection or disconnection, the current in the first primary side can change, voltage can be generated at the first secondary side according to the electromagnetic induction principle, and electric energy at the first primary side is transmitted to the first secondary side. The first primary side and the first secondary side are isolated from each other, the first primary side is located on the low-voltage side, the first secondary side is located on the high-voltage side, and the low-voltage input signal of the low-voltage side can be converted into the wake-up signal of the high-voltage side through electromagnetic induction. Further, when the first diode D1When the voltage of the anode is greater than that of the cathode, the first diode D1Is conducted, the voltage at the first secondary side passes through the first diode D1Transmitted to the control module and in the first diode D1The negative pole of (2) is converted into direct current.
When the first switch unit M1When the first diode D is continuously and alternately connected and disconnected in a first preset frequency range, the electric energy at the first primary side is continuously transmitted to the first secondary side, so that the first diode D1The negative electrode continuously outputs direct current, namely continuously generates a wake-up signal. Wherein the first switch unit M1The first predetermined frequency of connection and disconnection is not limited herein, as long as the first predetermined frequency is high enough to allow the first diode D to be connected and disconnected1The direct current frequency output by the cathode meets the use requirement.
Wherein the first switch unit M1To ground when the first transformer Nps1When a current flows internally, the current flows to the first switching unit M through the first primary side1. Here the input and output of the wake-up module P2, and the first switching unit M1The input port and the output port of (a) do not indicate the actual current flow direction, but only the first switching unit M1And wake-up module P2.
Wherein, in order to improve the stability of the wake-up signal, the first diode D is added1Is connected with the direct current output by the cathodeThe wake-up module P2 further includes a first rectifying circuit disposed between the output terminal of the wake-up module P2 and the input terminal of the control module P3, and the input terminal of the first rectifying circuit is connected to one end of the first secondary side and the first diode D1The output end of the first rectifying circuit is connected to the input end of the control module P3, and the first rectifying circuit is grounded. By arranging the first rectifying circuit, the first diode D can be connected1The wake-up signal output by the cathode is rectified and filtered to drive the first diode D1The direct current output by the cathode is rectified into continuous direct current, so that the stability of the wake-up signal output by the wake-up module P2 is improved.
The first rectifying circuit can be arranged in various ways, for example, the first rectifying circuit comprises a fourth capacitor C4Fourth capacitor C4Is connected to one end of the first secondary side, a fourth capacitor C4The other end of the first diode D is connected with the input end of the control module P31And a fourth capacitance C4Parallel, first diode D1Is also connected to the input terminal of the control module P3, and the first diode D is connected to the input terminal of the control module P3 by using the charge-discharge characteristics of the capacitor1The direct current output by the cathode of (2) is rectified into continuous and stable direct current.
The control module P3 can be arranged in various ways, and as an alternative embodiment, the control module P3 comprises a high voltage controller and a second switch unit M2(ii) a The input end of the high-voltage controller is connected with the output end of the power battery P5 and the output end of the awakening module P2, and the output end of the high-voltage controller is connected with the second switch unit M2Is connected to the input terminal of the second switching unit M2Is connected with the input end of the battery management system P6; the high voltage controller is used for receiving the wake-up signal, generating an initial signal according to the wake-up signal, and controlling the power conversion module P4 to supply power to the battery management system P6.
The high voltage controller may be arranged in various ways, for example, the high voltage controller is a PWM control chip, and the second switching unit M2In a plurality of ways, e.g. the second switch unit M2Is a switching device.
In these alternative casesIn the embodiment, the high voltage controller and the second switch unit M2And a power battery P5 are both positioned on the high-voltage side, and a first transformer Nps1The input signal of the low voltage side is converted into the wake-up signal of the high voltage side, so that the wake-up signal can be transmitted to the high voltage controller, and the high voltage controller controls the power battery P5 to start working according to the wake-up signal. In addition, the high voltage controller also transmits a control signal to the power conversion module P4 to control the power conversion module P4 to supply power to the battery management system P6. The power conversion module P4 starts to work after receiving the control signal of the high voltage controller, converts the high voltage of the power battery P5 into low voltage, and transmits the low voltage to the battery management system P6, and the second switch unit M2The circuit of the high-voltage controller can be disconnected or connected.
Furthermore, a second filter circuit is further arranged at the output end of the power battery P5, the input end of the second filter circuit is connected to the output end of the power battery P5, and the output end of the second filter circuit is connected to the input end of the high-voltage controller and the input end of the power conversion module P4.
The second filter circuit can be arranged in various ways, for example, the second filter circuit comprises a second inductor L2A seventh capacitor C7And an eighth capacitance C8The second filter circuit may be configured to filter the high voltage output from the power battery P5.
In some alternative embodiments, the power conversion module P4 includes a second transformer Nps2And a second diode D2Second transformer Nps2Comprises a second primary side and a second secondary side which are isolated from each other, wherein the second primary side is connected with the power battery P5 and the second switching unit M2One end of the second secondary side is grounded, the other end of the second secondary side and a second diode D2So that when the second switching unit M is turned on2When connected or disconnected, the second transformer Nps2Converting the high voltage of the power battery P5 into low voltage electricity through a second primary side and a second secondary side; second diode D2Is connected to the input of the battery management system P6.
When the output end of the power battery P5 is provided with a second filter circuit, one end of the second primary side is connected to the power battery P5 through the second filter circuit.
In these alternative embodiments, in the second switching unit M2In the process of connection or disconnection, the current in the second primary side can change, voltage can be generated at the second secondary side according to the electromagnetic induction principle, electric energy at the second primary side is transmitted to the second secondary side, and meanwhile high voltage at the second primary side can be converted into low voltage electricity at the second secondary side. The second primary side is located on the high-voltage side, the second secondary side is located on the low-voltage side, and the second primary side and the second secondary side are isolated from each other, so that the embodiment can not only realize the safe isolation of the high-voltage side and the low-voltage side, but also convert the high-voltage power of the high-voltage side into the low-voltage power to supply power to the battery management system P6. Further when a second diode D2When the voltage of the anode is greater than that of the cathode, the second diode D2Is conducted, and the voltage at the second secondary side passes through the second diode D2To the battery management system P6 and in the second diode D2The negative electrode of (2) outputs direct current low voltage electricity.
When the second switch unit M2When the first diode D is continuously and alternately connected and disconnected in a first preset frequency range, the electric energy at the first primary side is continuously transmitted to the first secondary side, so that the first diode D2The cathode of the transformer continuously outputs direct current low voltage electricity. Wherein the second switch unit M2The second predetermined frequency of switching on and off is not limited herein, as long as the second predetermined frequency is high enough to allow the second diode D to be connected2The direct current low-voltage frequency output by the cathode meets the use requirement. The second preset frequency may be the same as or different from the first preset frequency.
Wherein the second switch unit M2To ground when the second transformer N is connectedps2When a current flows internally, the current flows to the second switching unit M through the second primary side2. Here the input and output of the wake-up module P2, and the second switching unit M2Does not represent the actual current flow direction, but only the second switching unit M2And wake-up module P2.
In order to raise the output of the power conversion module P4 to lowThe power conversion module P4 further comprises a second rectifying circuit, the second rectifying circuit is arranged between the output end of the power conversion module P4 and the input end of the battery management system P6, and the input end of the second rectifying circuit is connected to one end of a second primary side and the second diode D2The output end of the second rectifying circuit is connected to the battery management system P6, and the output end of the second rectifying circuit is also grounded. By providing a second rectifier circuit, a second diode D can be connected2The output DC low voltage is rectified and filtered to improve the stability of output signal, and a second diode D is connected to the output DC low voltage2The direct current low voltage output by the negative electrode is rectified into continuous direct current low voltage.
The second rectification circuit can be arranged in various ways, for example, the second rectification circuit comprises a ninth capacitor C9Ninth capacitor C9Is connected to one end of the second secondary side, a ninth capacitor C9Is connected to the input of a battery management system P6, a second diode D2And a ninth capacitor C9Parallel, a second diode D2Is also connected to the input terminal of the battery management system P6, and the second diode D is connected to the input terminal of the battery management system P6 by utilizing the charge-discharge characteristics of the capacitor2The dc low voltage output from the cathode of (1) is rectified into a continuous and stable dc low voltage.
In some optional embodiments, the charge wake-up device further comprises a snubber circuit P7, the snubber circuit P7 is connected in parallel across the second primary side, and the snubber circuit P7 is used for clamping the voltage across the second primary side.
In these alternative embodiments, when the second switch unit M2When the transformer is connected or disconnected, the current in the second primary side or the second secondary side can change, and the second transformer N is provided with a high voltage at the second primary side and a low voltage at the second secondary sideps2The second primary side and the second secondary side have a certain turn ratio, so that when the current in the second secondary side changes, the voltage generated at two ends of the second primary side is larger, and the two ends of the second primary side are provided with the absorption circuits P7, so that the voltage at two ends of the second primary side can be effectively clamped, and the N-type transformer N is reducedps2Leakage inductance in the second switch unit M2A voltage spike formed fromWhile lowering the second switching unit M2Loss of (2).
It will be appreciated that an absorption circuit P7 may be connected in parallel across the first primary side for clamping the voltage across the first primary side and reducing the voltage across the first transformer Nps1Leakage inductance in the first switch unit M1Voltage spike formed thereby to lower the first switching unit M1Loss of (2).
The absorption circuit P7 can be arranged in various ways, for example, the absorption circuit P7 includes a third diode D3A fifth resistor R5And a sixth capacitance C6Fifth resistor R5And a sixth capacitance C6Are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the second primary side, and the other end of the parallel circuit is connected with the third diode D3Is connected to the negative pole of the third transistor D3Is connected with the other end of the second primary side.
The working principle of an alternative embodiment of the charge wake-up device is described below with reference to fig. 3 as an example:
the first filter circuit is connected to the low-voltage charging port P0 and filters the low-voltage Vin at the low-voltage charging port P0 when the low-voltage Vin is input to the low-voltage charging port P0.
The input end of the voltage stabilizer is connected with the output end of the first filter circuit, and when the first filter circuit outputs low voltage Vin to the voltage stabilizer, the voltage stabilizer is used for stabilizing the voltage of the Vin filtered by the first filter circuit.
The input end of the low-voltage controller is connected with the output end of the voltage stabilizer, and when the low-voltage controller receives the low-voltage Vin of the low-voltage charging port, the low-voltage controller is used for generating a low-voltage input signal according to the low-voltage Vin.
First switch unit M1Is connected to the output of the low-voltage controller when the low-voltage controller is switched to the first switching unit M1When outputting low-voltage input signal, the first switch unit M1And starts to be continuously and alternately connected or disconnected. Wherein the first switch unit M1Grounded, first switching unit M1MOS transistors may be used.
First transformer Nps1Is connected to the first primary sideOutput terminal of filter circuit and first switch unit M1When the first switching unit M is turned on1When the first diode D is continuously and alternately connected or disconnected, the current circulating in the first primary side changes, and according to the electromagnetic induction principle, the electric energy of the first primary side is transmitted to the first secondary side1When the voltage of the anode is greater than that of the cathode, the first diode D1Is conducted, the voltage at the first secondary side passes through the first diode D1And transmitting to the control module. First transformer Nps1And converting a low-voltage input signal of a low-voltage side into a wake-up signal of a high-voltage side through the first primary side and the first secondary side, and sending the wake-up signal to the high-voltage controller. By providing a first diode D1Fourth capacitor C4And converting a low-voltage input signal of a low-voltage side into a stable and continuous direct-current wake-up signal of a high-voltage side.
The input end of the high-voltage controller is connected with the first diode D1And the output of the power cell P5, and the high voltage controller is grounded. When the high voltage controller receives the first diode D1When the wake-up signal is sent, the high-voltage controller controls the power battery P5 to start working and receives the high voltage sent by the power battery P5. The output end of the power battery P5 is provided with a second filter circuit, and the input end of the high-voltage controller is connected with the output end of the power battery P5 through the second filter circuit.
Second switch unit M2Is connected to the output end of the high voltage controller, when the high voltage controller receives the high voltage power sent by the power battery P5, the high voltage power is sent to the second switch unit M2When a high voltage is supplied, the second switch unit M2And starts to be continuously and alternately disconnected or connected. Wherein the second switch unit M2Grounded, second switching unit M2MOS transistors may be used.
Second transformer Nps2Is connected to the second switching unit M2Between the output of the second filter circuit and the output of the second filter circuit, when the second switching unit M2When the two primary sides are alternately connected or disconnected, the current in the second primary side can be changed, voltage can be generated at the second secondary side according to the electromagnetic induction principle, and the voltage at the second primary side can be changedThe electrical energy is transferred to the second secondary side. When the second diode D2When the voltage of the anode is greater than that of the cathode, the second diode D2Is conducted, and the voltage at the second secondary side passes through the second diode D2To the battery management system P6. Second transformer Nps2The high voltage of the power battery P5 is converted into low voltage and is transmitted to the battery management system P6. And by providing a second diode D2And a ninth capacitor C9The high voltage of the power battery P5 is rectified into stable and continuous direct current low voltage electricity.
And the two ends of the second primary side are also connected with an absorption circuit P7 in parallel and used for clamping the voltage at the two ends of the second primary side.
Therefore, when the battery management system P6 is in a sleeping process and the vehicle is charged, the low-voltage charging port P0 generates the input voltage Vin, and the charging wake-up device according to the embodiment of the invention can wake up the power battery P5 to supply power to the battery management system P6, so that the battery management system P6 can work normally, and therefore when a lead-acid battery is not arranged in the vehicle or the lead-acid battery is damaged, the high-voltage power in the power battery P5 is used for supplying power to the battery management system P6, and the normal operation of the battery management system P6 can still be ensured.
The second embodiment of the invention also discloses a battery system, which comprises the charging wake-up device in any embodiment. Since the present embodiment includes the charging wake-up device according to any of the above embodiments, the present embodiment includes the beneficial effects of the charging wake-up device according to any of the above embodiments, and the details are not repeated herein.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A charging wake-up device is characterized by comprising a wake-up module, a control module and a power supply conversion module;
the input end of the awakening module is connected with the low-voltage charging port, the output end of the awakening module is connected with the input end of the control module, the input end of the control module is further connected with the output end of the power battery, the output end of the control module is connected with the input end of the power conversion module, the input end of the power conversion module is further connected with the output end of the power battery, and the output end of the power conversion module is connected with the input end of the battery management system;
when the battery management system is in a dormant state, the input end of the wake-up module is used for receiving a low-voltage input signal and generating a wake-up signal according to the low-voltage input signal, and the control module is used for receiving the wake-up signal, outputting an initial signal for starting working to the power battery according to the wake-up signal and controlling the power supply conversion module to supply power to the battery management system.
2. The charge wake-up device according to claim 1, further comprising:
the input end of the detection module is connected with the low-voltage charging port, and the output end of the detection module is connected with the input end of the awakening module;
the detection module is used for detecting a voltage signal of the low-voltage charging port, and if the low-voltage charging port has a preset voltage, the detection module sends the low-voltage input signal to the awakening module.
3. The charge wake-up device according to claim 2, wherein the detection module comprises a low voltage controller and a first switching unit;
the input end of the low-voltage controller is connected with the low-voltage charging port, the output end of the low-voltage controller is connected with the input end of the first switch unit, and the output end of the first switch unit is connected with the input end of the awakening module;
the low-voltage controller is used for detecting the charging voltage of the low-voltage charging port, and if the low-voltage charging port has a preset voltage, the low-voltage controller sends the low-voltage input signal to the awakening module through the first switch unit.
4. The charge wake-up device according to claim 3, wherein the detection module further comprises: the input of stabiliser with the low pressure mouth that charges is connected, the output of stabiliser with the input of low pressure controller is connected, the stabiliser is used for to the voltage signal of low pressure mouth that charges carries out steady voltage and handles.
5. The charge wake-up unit according to claim 3, wherein the wake-up module comprises a first transformer and a first diode;
the first transformer comprises a first primary side and a first secondary side which are isolated from each other, the first primary side is connected between the low-voltage charging port and the first switch unit, one end of the first secondary side is grounded, and the other end of the first secondary side is connected with the anode of the first diode, so that when the first switch unit is connected or disconnected, the first transformer converts the low-voltage input signal into the wake-up signal through the first primary side and the first secondary side;
and the cathode of the first diode is connected with the input end of the control module.
6. The charge wake-up device according to claim 1, wherein the control module comprises a high voltage controller and a second switching unit;
the input end of the high-voltage controller is connected with the output end of the power battery and the output end of the awakening module, the output end of the high-voltage controller is connected with the input end of the second switch unit, and the output end of the second switch unit is connected with the input end of the power supply conversion module;
the high-voltage controller is used for receiving the wake-up signal, generating the originating signal according to the wake-up signal and controlling the power supply conversion module to supply power to the battery management system.
7. The charge wake-up apparatus according to claim 6, wherein the power conversion module further comprises a second transformer and a second diode;
the second transformer comprises a second primary side and a second secondary side which are isolated from each other, the second primary side is connected between the output end of the power battery and the output end of the second switch unit, one end of the second secondary side is grounded, and the other end of the second secondary side is connected with the anode of the second diode, so that when the second switch unit is connected or disconnected, the second transformer converts the high-voltage electricity of the power battery into low-voltage electricity through the second primary side and the second secondary side;
and the cathode of the second diode is connected with the input end of the battery management system.
8. The charge wake-up unit according to claim 7, further comprising an absorption circuit connected in parallel across the second primary side, the absorption circuit configured to clamp a voltage across the second primary side.
9. The charge wake-up device according to claim 8, wherein the absorption circuit comprises a third diode, a fifth resistor and a sixth capacitor;
the fifth resistor and the sixth capacitor are connected in parallel to form a parallel circuit, one end of the parallel circuit is connected with one end of the second primary side, and the other end of the parallel circuit is connected with the negative electrode of the third diode;
and the anode of the third diode is connected with the other end of the second primary side.
10. A battery system comprising a charge wake-up unit according to any of claims 1 to 9.
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