Charging wake-up circuit, vehicle-mounted charger, electric driving system and vehicle

Abstract

A charge wake-up circuit, an on-board charger, an electric drive system, and a vehicle are provided. The charge wake-up circuit may include: an input circuit configured to receive an input signal from an external charging device, where the input signal is capable of state switching among a plurality of states; the control chip is configured to switch a signal output by the control chip from a first control level to a second control level based on a rising edge of the input signal so as to wake up the circuit to be waken up, and when the control chip outputs the signal with the second control level according to the rising edge of the input signal and exceeds a preset time length, the signal with the second control level is waken up. The signal output by the control chip is switched from the second control level to the first control level until the input circuit receives the next rising edge, and the state switching comprises one or more of the following: switching from the state of keeping the first level to the state of keeping the second level; switching from the state of maintaining the second level to the state of the PWM signal; or switching from the state of keeping the first level to the state of the PWM signal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging control, and more particularly to a charging wake-up circuit, an on-board charger, an electric drive system and a vehicle. BACKGROUND

[0002] With the development of electric vehicle technology, intelligentization is becoming an important feature. In order to save energy, an electric vehicle may be in a hibernation state in some scenarios, for example, when it is not connected to an external charging device, when it is connected to an external charging device but does not charge it, or when it receives a hibernation instruction. Therefore, it is necessary to design a wake-up circuit to wake up an electric vehicle in a hibernation state when it is necessary to enable the vehicle charger to charge the electric vehicle (for example, to wake up the control circuit (for example, a micro control unit MCU) of the on-board charger (OBC) of the electric vehicle to control the charging process).

[0003] According to the current standard, for example, GB / T 18487.1-2023, the control pilot (CP) signal input to the on-board charger has multiple states. For example, according to the actual needs of the user, it can include multiple charging wake-up modes for the electric vehicle, such as plug-in charging wake-up mode, alternating current charging wake-up mode, and pre-charge wake-up mode, etc., and different charging wake-up modes correspond to different switching modes of the state of the CP signal. It is desirable that for the state switching of the CP signal corresponding to different charging wake-up modes, the electric vehicle can be woken up to ensure that it can be charged in time when needed, i.e. the charging wake-up circuit needs to output a wake-up signal to wake up the circuit to be woken up (for example, a control circuit such as an MCU) in the on-board charger, so that the circuit to be woken up can work normally to ensure that the electric vehicle can be charged normally and in time.

[0004] Many current charging wake-up circuits can only implement one of the wake-up modes, resulting in a single wake-up method for the electric vehicle. Alternatively, in order to be compatible with the various charging wake-up modes described above, multiple charging wake-up circuits and an additional MCU to detect the state of the CP signal are required. The MCU needs to work all the time and cannot be completely hibernated, resulting in a relatively high static current during hibernation, and at the same time, it will increase the cost of the additional circuit, and also result in a complex circuit structure, which does not conform to the development trend of miniaturization and intelligentization. SUMMARY

[0005] One aspect of this application provides a charging wake-up circuit. The circuit may include: an input circuit configured to receive an input signal from an external charging device, wherein the input signal is capable of switching between multiple states; and a control chip configured to switch its output signal from a first control level to a second control level based on the rising edge of the input signal to wake up the circuit to be woken up; wherein when the control chip outputs a signal having the second control level according to the rising edge of the input signal for a predetermined duration, the signal output by the control chip switches back from the second control level to the first control level until the input circuit receives the next rising edge of the input signal, the state switching includes one or more of the following: switching from a state maintaining a first level to a state maintaining a second level greater than the first level; switching from a state maintaining the second level to a state of a PWM signal; or switching from a state maintaining the first level to a state of the PWM signal.

[0006] Optionally, the input circuit includes a voltage conversion circuit configured to convert the voltage of the input signal into a first conversion level or a second conversion level applicable to the control chip; when the input signal switches between multiple states, the voltage conversion circuit outputs a signal with a predetermined type of transition edge from the first conversion level to the second conversion level.

[0007] Optionally, the voltage conversion circuit includes a comparator circuit, wherein the input signal is applied to the first input terminal of the comparator, a reference voltage level is applied to the second input terminal of the comparator, and the output terminal of the comparator is connected to the control input terminal of the control chip; the first power supply terminal and the second power supply terminal of the comparator are applied with a first conversion level and a second conversion level; wherein when the level of the input signal is higher than the reference voltage level, the comparator outputs a signal with a second conversion level; when the level of the input signal is lower than the reference voltage level, the comparator outputs a signal with a first conversion level.

[0008] Optionally, when the circuit to be woken up is triggered by a falling edge and the first control level is lower than the second control level, the wake-up circuit further includes: a falling edge generation circuit, configured to generate a wake-up signal with a falling edge in response to the signal output by the control chip switching from the first control level to the second control level.

[0009] Optionally, when the circuit to be woken up is triggered by a rising edge and the first control level is higher than the second control level, the wake-up circuit further includes: a rising edge generation circuit, configured to generate a wake-up signal with a rising edge in response to the signal output by the control chip switching from the first control level to the second control level.

[0010] Optionally, when the input signal switches from a state of holding the first level to a state of holding the second level, in response to the voltage of the input signal switching from the first level to the second level, the voltage conversion circuit outputs a signal with a predetermined type of transition edge switching from the first conversion level to the second conversion level, and in response to the signal with the predetermined type of transition edge, the signal output by the control chip switches from the first control level to the second control level.

[0011] Optionally, when the input signal switches from a state of maintaining the first level or the second level to the state of the PWM signal, in response to the voltage of the input signal switching from the first level or the low level of the PWM signal to the high level of the PWM signal, the voltage conversion circuit outputs a signal with a predetermined type of transition edge switching from the first conversion level to the second conversion level, and in response to the signal with the predetermined type of transition edge, the signal output by the control chip switches from the first control level to the second control level.

[0012] Optionally, when the input signal remains a PWM signal, the control chip continuously outputs a signal with the second control level based on the periodic rising edges of the PWM signal.

[0013] Optionally, when the control chip outputs a signal with the second control level according to a predetermined type of transition edge output by the voltage conversion circuit and the duration exceeds the predetermined time, the output signal is switched from the second control level back to the first control level and maintained at the first control level until the control chip receives the next predetermined type of transition edge output by the voltage conversion circuit.

[0014] Optionally, the input signal is a conversion signal of a control guidance (CP) signal output from an external charging device, the circuit to be woken up is a control circuit within the on-board charging device, and the charging wake-up circuit is also located within the on-board charging device.

[0015] Optionally, the control chip is a watchdog control chip.

[0016] According to another aspect of this application, an on-board charging device is provided, which may include: a control circuit; wherein, the charging wake-up circuit as described above can be used to wake up the control circuit.

[0017] According to another aspect of this application, an electric drive system is provided, which may include: an on-board charging device as described above for charging an energy storage device; and a power conversion circuit for generating drive power based on power from the energy storage device.

[0018] According to another aspect of this application, a vehicle is provided, comprising: an electric drive system as described above.

[0019] The charging wake-up circuit, on-board charger, electric drive system, and vehicle of this application enable the detection of various state transitions of input signals corresponding to different charging wake-up scenarios based on rising edges. This allows for the generation of a trigger signal to wake up the circuit under test for each state transition, ensuring timely activation and charging for various charging wake-up scenarios. Furthermore, the charging wake-up circuit is primarily implemented using a control chip such as a watchdog timer, resulting in a simple structure and reduced cost. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings of the embodiments of this application.

[0021] Figure 1 A schematic diagram of an example charging system for an electric vehicle is shown.

[0022] Figure 2 A schematic diagram of the charging wake-up circuit according to an embodiment of this application is shown.

[0023] Figure 3 A schematic waveform diagram of the input signal received by the charging wake-up circuit is shown.

[0024] Figure 4 The combination Figure 2 and Figure 3 The circuit structure of each part of the charging wake-up circuit is described.

[0025] Figure 5 It shows Figure 4 The circuit shown is a specific example circuit.

[0026] Figure 6 It shows Figure 5 The measured results of the circuit shown. Detailed Implementation

[0027] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0028] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used throughout this patent document. The terms “comprising” and “including” and their derivatives mean including but not limited to. The term “or” is inclusive, meaning and / or. The phrase “associated with” and its derivatives mean including, comprising, connected to, interconnected with, containing, contained within, connected to or connected to, coupled to or coupled with, communicable with, cooperating with, intertwined, juxtaposed, proximate, bound to or bound to, having, possessing attributes of, having a relationship with, or having a relationship with. The term “controller” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or in a combination of hardware and software and / or firmware. The functionality associated with any particular controller may be centralized or distributed, local or remote.

[0029] The terminology used herein to describe embodiments of this application is not intended to limit and / or restrict the scope of this application. For example, unless otherwise defined, the technical or scientific terms used in this disclosure should be understood in their ordinary sense by one of ordinary skill in the art to which this application pertains.

[0030] It should be understood that the terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Unless the context clearly indicates otherwise, the singular forms “a,” “one,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one.

[0031] As used herein, any reference to “an example” or “example,” “an embodiment” or “an embodiment” means that a particular element, feature, structure, or characteristic described in connection with that embodiment is included in at least one embodiment. The phrases “in one embodiment” or “in one example” appearing in different places in the specification do not necessarily refer to the same embodiment.

[0032] To further understand, the terms "including" or "contains," and similar words, mean that the element or object preceding the word covers the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Above," "below," "left," and "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described objects changes, the relative positional relationship may also change accordingly.

[0033] The various embodiments discussed below for describing the principles of this disclosure in this patent document are for illustrative purposes only and should not be construed in any way as limiting the scope of this disclosure.

[0034] Figure 1 A schematic diagram of an example charging system for electric vehicles is shown. This schematic diagram is also described in the national standard GB / T18487.1-2023.

[0035] like Figure 1 As shown, the external power supply device 10 and the electric vehicle 20 can be connected via a vehicle interface 30. The vehicle interface 30 may include a vehicle plug 301 and a vehicle socket 302, with the vehicle plug 301 associated with the external charging device 10 and the vehicle socket 302 associated with the electric vehicle 20. The external power supply device 10 may be a charging station, and the charging gun associated with the charging station includes a vehicle plug for connecting to the vehicle socket associated with the electric vehicle 20, thereby enabling this connection to provide power from the external charging device to the on-board charging device 201 of the electric vehicle.

[0036] After the vehicle plug associated with vehicle interface 30 and the vehicle socket associated with electric vehicle 20 are connected, i.e., after the vehicle interface is fully connected, the vehicle controller 202 of electric vehicle 20 can determine that the vehicle interface is fully connected based on the CC signal at the CC terminal. After full connection, the equipment ground DGND and the vehicle body ground VGND are connected and both have a ground level.

[0037] Furthermore, the signal at the CP port of the external charging device, also known as the control guidance (CP) signal, corresponds to different states of the external charging device and is a signal that the device controller 101 of the external charging device can control. When not connected to an electric vehicle, the CP signal can be a voltage signal with a 12V level or a PWM signal, where the amplitude of the PWM signal varies between +12V and -12V, switched by switch S2. Taking a charging pile including a charging gun as an example, before the charging gun is inserted into the vehicle socket of the electric vehicle (hereinafter referred to as the plug-in gun), the CP signal is a voltage signal with a 12V level (for example only). After the charging gun is plugged in, due to... Figure 1The voltage divider resistors shown (e.g.) Figure 1 The presence of R03 (as shown) will cause the CP signal voltage to jump from 12V to 9V, or if switch S2 is already closed at this time, due to... Figure 1 The presence of resistor R02 indicates a jump to a 6V level, where the closing timing of switch S2 is customizable. Subsequently, the charging pile's device controller (e.g., MCU) detects the CP signal jumping from 12V to 9V or 6V and confirms successful data communication with the electric vehicle, then switches switch S1 to output a PWM signal. The PWM duty cycle represents the charging pile's output current. The PWM high level of this signal is 9V or 6V, the same level as the previous stage, and due to the presence of diode D0... Figure 1 Resistors R02 and R03 in the circuit cannot continue to serve as voltage divider signals, therefore the PWM low level is -12V. After the charging pile's equipment controller detects that the CP signal has changed to a PWM signal with a 6V level, it can close the main relay on the charging line to provide AC power to the on-board charging equipment 201.

[0038] Of course, throughout this article Figure 1 The charging system shown is merely an example. Depending on different standards and application scenarios, the charging system can have other structures. For example, other charging systems may not include switch S2. This application does not impose any limitations. This application mainly focuses on the charging wake-up circuit based on the state switching of the CP signal.

[0039] The following are Figure 1 This paper introduces common application scenarios of charging wake-up based on CP signals in the electric vehicle charging system shown.

[0040] In the scenario of plug-in charging wake-up, the electric vehicle is in a vehicle sleep mode and not connected to the charging gun. Therefore, the electric vehicle cannot receive the CP signal from the charging gun via the CP port, and the voltage at detection point 2 is ground level (0V). When the charging gun is plugged in, depending on the closing time of switch S2, the CP signal received by the electric vehicle through the CP port of the vehicle interface, after passing through diode D0, has a signal level of 9V or 6V, which is used as the input signal to the charging wake-up circuit to be described. Then, the charging pile can perform data communication interaction with the electric vehicle and switch to outputting a PWM signal after the interaction is completed. In addition, for this application scenario or some other application scenarios, there may be poor contact of the connection interface, resulting in the inability to receive the CP signal through the CP port, while the charging pile still outputs a PWM signal. Therefore, the electric vehicle may enter sleep mode again. At this time, the voltage at detection point 2 is 0V. When the CP signal is received again, the signal of the CP signal received through the CP interface, after passing through diode D0, also switches from a state of maintaining a 0V level to a PWM signal state. The PWM signal has a 9V or 6V level and a 0V level, so it is also necessary to wake up the electric vehicle. Therefore, the signal at detection point 2 after the CP signal received via the vehicle interface passes through diode D0 can switch from a state of maintaining 0V level to a state of maintaining 9V or 6V level, or from a state of maintaining 0V level to a state of PWM signal with 9V or 6V level and 0V level.

[0041] Furthermore, in scenarios involving scheduled charging wake-up (scheduled via external charging equipment or an app), the electric vehicle can connect to the charging gun. However, before the scheduled time arrives, switch S2 is open, and the charging pile outputs a 12V signal. The CP signal level becomes 9V (derived from a 12V voltage divider) and switches to a PWM signal after successful data communication confirmation with the electric vehicle. Because switch S2 is open, the PWM signal level is 9V and 0V, and the electric vehicle is in a sleep state. When the scheduled time arrives, the charging pile can output a 12V voltage signal again. Switch S2 can close at a custom time after the scheduled time. The charging pile detects that the CP signal has changed to 9V or 6V and successfully confirms data communication confirmation with the electric vehicle, then switches to a PWM signal to charge the electric vehicle. Therefore, the CP signal received via the vehicle interface, after passing through diode D0, can switch between a state maintaining a 9V or 6V level and a state with a PWM signal having both 9V or 6V and 0V levels.

[0042] In addition, for the AC charging wake-up mode, similar to scheduled charging, the electric vehicle can connect to the charging gun. However, after plugging in the gun, there is no AC power on the charging line to charge the on-board charging device 201 in the electric vehicle. Therefore, the electric vehicle is in a vehicle sleep mode until the charging pile responds with a PWM signal indicating the presence of AC power. The PWM signal is related to the AC power-based charging process. Therefore, the CP signal received via the vehicle interface, after passing through diode D0, exhibits a state transition from maintaining a 9V or 6V level to a PWM signal with 9V, 6V, or 0V levels.

[0043] In summary, regarding Figure 1 The electric vehicle charging system shown in the diagram involves the input signal received by the electric vehicle, after passing through diode D0, switching between different states. This state switching requires waking up the electric vehicle's wake-up circuit to enable interaction between the electric vehicle and the external charging device, thereby completing the charging process. In summary, the state switching can include: 1. Switching from a state maintaining a 0V level (as an example of the first level described below, also used to represent the first PWM level) to a state maintaining a 9V or 6V level (as an example of the second level described below, also used to represent the second PWM level); 2. Switching from a state maintaining a 0V voltage to a PWM signal state with both 9V or 6V and 0V levels; 3. Switching from a state maintaining a 9V or 6V level to a PWM signal state with both 9V or 6V and 0V levels.

[0044] Therefore, in order to achieve normal charging of electric vehicles, a charging wake-up circuit is needed, which can wake up the circuit to be woken up (e.g., the control circuit) of the electric vehicle when the electric vehicle is in a dormant state, so as to charge the electric vehicle, and can also be applied to different application scenarios of charging wake-up.

[0045] Figure 2 A schematic diagram of a charging wake-up circuit according to an embodiment of this application is shown. This charging wake-up circuit may include, for example... Figure 1 The diagram shows the internal or external on-board charging equipment of an electric vehicle. This charging wake-up circuit can be used to wake up the control circuit within the on-board charging equipment (or the auxiliary power supply providing operating voltage to the control circuit within the on-board charging equipment) when the electric vehicle is in a dormant state, thereby enabling the control circuit to control the vehicle's charging process.

[0046] like Figure 2 As shown, the charging wake-up circuit 200 may include an input circuit 210 and a control chip 220.

[0047] The input circuit 210 can be configured to receive an input signal from an external charging device 10, wherein the input signal is capable of switching between one or more states.

[0048] The control chip 220 can be configured to switch the signal output by the control chip 220 from a first control level to a second control level based on the rising edge of the input signal, in order to wake up the circuit to be woken up.

[0049] When the control chip 220 outputs a signal with the second control level based on (any) rising edge of the input signal and this output signal remains at the second control level for a predetermined duration (relative to the rising edge), the output signal of the control chip 220 switches back to the first control level until the input circuit receives the next rising edge of the input signal. Optionally, the control chip 220 can be a watchdog control chip, and the predetermined duration can be the duration corresponding to the reset condition of the watchdog control chip, i.e., how long after no trigger signal (i.e., a feed signal) is received will the output signal of the watchdog control chip reset to the default state.

[0050] In some embodiments of this application, the first control level is described as being lower than the second control level, but the second control level can also be lower than the first control level. This is determined based on the internal logic design of the control chip 220, and the specific values ​​of the first and second control levels are also determined based on the selection of the control chip 220. Furthermore, the control chip 220 can switch from the first control level to the second control level based on a transition edge (rising or falling edge) at its control input terminal CCT. For example, the output signal of the control chip 220 may transition based on the rising edge of the signal at its control input terminal.

[0051] As described above, for different application scenarios of charging wake-up, state switching may include: switching from a state of maintaining a first level (e.g., 0V) to a state of maintaining a second level (e.g., 9V or 6V); switching from a state of maintaining the second level to a state of the PWM signal; or switching from a state of maintaining the first level to a state of the PWM signal.

[0052] For example, combining Figure 1 The external charging device 10 can be a charging pile and can provide a CP signal to the electric vehicle via the vehicle interface. The input signal from the external charging device to the charging wake-up circuit can be a converted CP signal, for example, such as... Figure 1 As shown, the signal after the CP signal passes through diode D0 is used as the input signal of the charging wake-up circuit 20. In this way, the negative voltage in the CP signal will correspond to the 0V voltage in the input signal, and the positive voltage in the CP signal will be output as is.

[0053] For ease of explanation, Figure 3 A schematic waveform diagram of the input signal received by the charging wake-up circuit is shown. This input signal is associated with the CP signal and is as follows: Figure 1 The signal at detection point 2 is shown. Note that... Figure 3 As well as elsewhere in this document, the specific voltage values ​​are shown only as examples. These voltage values ​​can be other values ​​depending on the actual situation, as long as a predetermined relative size relationship exists.

[0054] As described above for different application scenarios, such as Figure 3 As shown, the voltage of the input signal can jump from 0V to 9V or 6V, or the voltage of the input signal can switch from 9V or 6V to the 0V voltage of the PWM signal, or the voltage of the input signal can switch from 0V to the 9V or 6V voltage of the PWM signal, which involves the above three state switching.

[0055] exist Figure 3 For ease of description, a constant level of 9V or 6V is shown. However, since the closing timing of switch S2 is customizable, in reality, 9V and 6V may exist simultaneously, i.e., at the very beginning... Figure 1 The switch S2 shown is not closed, and the CP signal level is 9V. When switch S2 is closed, the CP signal level will jump from 9V to 6V. Similarly, it is also possible that the PWM signal amplitude is initially 9V, and then changes to 6V after switch S2 is closed. However, the trend of state switching can be observed... Figure 3 This is reflected in the text.

[0056] In addition, it should be noted that although Figure 3 For ease of description, all possible state transitions involved in the charging wake-up process are shown; however, it should be noted that in practice, only some of these state transitions may occur.

[0057] from Figure 3 As can be seen, a rising edge (as shown by the ellipse) exists in the waveform of the input signal during each state transition. Therefore, the control chip 220 can respond to the rising edge in the input signal by changing the corresponding level of its output signal. For example, when no rising edge appears in the input signal, the control chip 220 can output a signal at the default first control level, and when a rising edge appears in the input signal, the control chip 220 can output a signal at the second control level. Since the first control level and the second control level are not equal, the output signal of the control chip 220 also exhibits a level transition. The transition level or transition edge can be used to wake up subsequent circuits awaiting wake-up.

[0058] Optionally, as an example, depending on the selection of the control chip 220, the first control level of the output signal of the control chip 220 is, for example, 0V, and the second control level is, for example, 5V.

[0059] Typically, the signal at the control input terminal CCT of the control chip 220 also has an ideal level range. Therefore, considering that the voltage level of the input signal (the signal after diode rectification of the CP signal) of the charging wake-up circuit 200 may not be within this ideal level range, the input circuit may include a voltage conversion circuit 2101 to convert the voltage level of the input signal into a first conversion level or a second conversion level applicable to the control chip. The first and second conversion levels are selected based on the ideal level range. For example, when the ideal level range is 0-5V, one of the first and second conversion levels is 0V, and the other is 5V. Of course, depending on the selection of the control chip 220, both can be other values. When the input signal switches between multiple states, the voltage conversion circuit 2101 can output a signal with a predetermined type of transition edge from the first conversion level to the second conversion level, as input to the control input terminal of the control chip 220.

[0060] Alternatively or additionally, depending on the output logic of the control chip, the input circuit 210 may include a first logic conversion circuit 2102. The first logic conversion circuit 2102 may have level inversion and / or level magnitude conversion functions. Level inversion can convert a high level to a low level or a low level to a high level, adapting to the trigger logic of the subsequent control chip 220. For example, in the absence of a level conversion circuit, the first logic conversion circuit can convert the voltage level of the input signal to the ideal level range of the control input terminal of the control chip 220 while performing level inversion. Alternatively, in the absence of the first logic conversion circuit 2102, the level conversion circuit can perform level inversion while performing level magnitude conversion. That is, both the voltage conversion circuit 2101 and the first logic conversion circuit 2102 can perform level magnitude conversion and level inversion; therefore, the charging wake-up circuit may include only one of them to simultaneously perform level inversion and level magnitude conversion.

[0061] For example, as a specific scenario, suppose the output logic of control chip 220 is such that when a falling edge appears in the signal at the control input terminal, its output signal will jump from the first control level to the second control level. In this case, if a level conversion circuit is not included, the first logic conversion circuit 2102 needs to perform level toggling and / or level magnitude conversion on the rising edge of the input signal. Alternatively, if a level conversion circuit is included (without level toggling), the first logic conversion circuit 2102 can perform level toggling on the corresponding rising edge in the signal after the level conversion circuit, so that the rising edge of the input signal can form a falling edge at the control input terminal of control chip 220, thereby causing the output signal of control chip 220 to jump from the first control level to the second control level. Alternatively, suppose the output logic of control chip 220 is such that when a rising edge appears in the signal at the control input terminal, its output signal will jump from the first control level to the second control level. At this time, if a level conversion circuit is not included and level conversion is required, the first logic conversion circuit 2102 can act as a level conversion circuit to convert the level of the input signal. Alternatively, if a level conversion circuit is included and the signal after the level conversion circuit responds to the rising edge of the input signal as a falling edge, the first logic conversion circuit 2102 needs to perform level flip conversion on the signal after the level conversion circuit so that a rising edge can be obtained at the control input terminal of the control chip 220 when the input signal is a rising edge, thereby the output signal at the output terminal of the control chip 220 will jump from the first control level to the second control level.

[0062] That is, the input circuit 210 may include one of a voltage conversion circuit 2101 or a first logic conversion circuit 2102, or both. The first logic conversion circuit 2102 can perform level-flipping and / or level-shifting on the input signal, or perform level-flipping on the signal output from the voltage conversion circuit, enabling the control chip 220 to switch the signal output from the control chip from a first control level to a second control level based on the rising edge of the input signal. The voltage conversion circuit 2101 may also have a similar function.

[0063] Optionally, as mentioned above, the control chip 220 can be a watchdog control chip, such as STM706, MAX 706, or SGM 706. When selecting a watchdog control chip, it is necessary to focus on the output logic of the watchdog control chip and the duration corresponding to the reset condition. That is, under what type of edge transition trigger signal will the output signal of the watchdog circuit in the watchdog control chip transition from the default first control level to the second control level, and how long after the input of the watchdog circuit has not been input by the trigger signal (i.e., the feed signal) will it reset to the first control level.

[0064] In some cases, if the circuit to be woken up is based on a signal with the same type of transition edge as the transition edge from the first control level to the second control level, and the first and second control levels can also match the ideal level range of the input signal of the circuit to be woken up, then the output terminal of the control chip can be connected to the input terminal of the circuit to be woken up, so that the output signal of the control chip can be directly used to wake up the circuit to be woken up.

[0065] In other cases, if the circuit to be woken up is based on a signal having a transition edge of the opposite type to that used to switch from the first control level to the second control level, the charging wake-up circuit may also include a second logic conversion circuit 230. For example... Figure 2 As shown in the dashed box, the second logic conversion circuit 230 can be configured to generate a signal with opposite transition edges based on the output signal of the control chip 220, for use in waking up the circuit to be woken up. Furthermore, similarly, the second logic conversion circuit 230 can also have a level shifting function in addition to its level toggling function.

[0066] For example, when the circuit to be woken up is triggered by a falling edge and the first control level is lower than the second control level, the second logic conversion circuit 230 of the wake-up circuit can be configured as a falling edge generation circuit to switch from the first control level to the second control level in response to the signal output by the control chip, generating a wake-up signal with a falling edge; or when the circuit to be woken up is triggered by a rising edge and the first control level is higher than the second control level, the second logic conversion circuit 230 of the wake-up circuit can be configured as a rising edge generation circuit to switch from the first control level to the second control level in response to the signal output by the control chip, generating a wake-up signal with a rising edge.

[0067] Therefore, combining Figure 2 and Figure 3The described charging wake-up circuit can detect the state transitions of various input signals corresponding to different charging wake-up scenarios based on the rising edge, thereby generating a trigger signal for waking up the circuit to be woken up for each state transition, so that the electric vehicle can be woken up in time for charging in various charging wake-up scenarios.

[0068] Figure 4 The combination is shown Figure 2 and Figure 3 The specific circuit structures of each part of the charging wake-up circuit are described. However, it should be understood that the structure of each part of the circuit is merely an example, and there can be other alternative or additional structures, as long as the same function can be achieved.

[0069] like Figure 4 As shown, the voltage conversion circuit 2101 may include a comparator circuit COMP. The first input terminal IN1 of comparator COM1 in comparator circuit COMP is supplied with an input signal from an external charging device, the second input terminal IN2 of comparator COM1 is supplied with a reference voltage level VREF, and the output terminal of comparator COMP1 is connected to the control input terminal of the control chip 220. A second conversion level (e.g., 5V) is supplied to the first power supply terminal VT1 of the comparator, and a first conversion level (e.g., 0V) is supplied to the second power supply terminal VT2, such that the level of the signal output from the output terminal of comparator COMP1 is either the first conversion level or the second conversion level. Figure 4 The diagram shows that the first input terminal IN1 is the non-inverting input and the second input terminal IN2 is the inverting input. Assuming the reference voltage level is 5V, when the input signal level is greater than or equal to 5V (for example, in the case of 9V or 6V in the application scenario), the comparator's output signal level is 5V, and when the input signal level is less than 5V (for example, in the case of 9V or 6V in the application scenario), the comparator's output signal level is 0V. That is, the comparator's output signal and the input signal level change trend are the same.

[0070] In other embodiments, the voltage conversion circuit may include a DC-DC conversion circuit, such as a linear voltage regulator circuit and a Buck circuit, or it may employ a structure of a switch and a resistor connected in series, which can also convert the level of the input signal to an appropriate level (e.g., 5V or 0V). In this case, the output signal of the voltage conversion circuit changes in the same direction as the level of its input signal.

[0071] Optionally, as described above, when the first logic conversion circuit 2102 is included, the first logic conversion circuit 2102 may include a switching structure composed of a switching transistor and a resistor. For example, as Figure 4As shown, the first switch SW1 and the first resistor R1 are connected in series between the power supply terminal VDD and the ground terminal GND (for example, corresponding to the second conversion level and the first conversion level, respectively). Thus, the first switch SW1 is turned on and off by the signal of the control electrode of the first switch SW1 (i.e., the input signal or the output signal of the level conversion circuit). By properly selecting the switch, the signal at the control electrode of the first switch SW1 can be level-flipped. Figure 4 The diagram shows that the first resistor R1 is a pull-up resistor and the switch SW1 is an N-type MOSFET. However, this is just an example. In practical applications, the first logic conversion circuit can be designed according to the specific switching method of the logic level and the type of switch.

[0072] Additionally, as mentioned earlier, when a second logic conversion circuit 230 is required, and this circuit is also used for level toggling and / or level shifting, a switching structure consisting of a switching transistor and a resistor can also be included. For example, as... Figure 4 As shown, the second switch SW2 and the second resistor R2 are connected in series between the second power supply terminal VDD2 and ground GND. The signal at the control electrode of the second switch SW2 (i.e., the output signal of the control chip 220) controls the turn-on and turn-off of the second switch SW2. By appropriately selecting the switch, the signal at the control electrode of the second switch SW2 can be level-flipped and / or its magnitude shifted to obtain the desired transition edge. Similarly, the second logic conversion circuit can be designed according to the specific logic level flipping method and the type of switch.

[0073] The following describes the process in conjunction with different state transitions. Figure 4 The circuit operation process is explained to better facilitate understanding of the solution in this application.

[0074] First, for the first type of state switching, when the input signal obtained by rectifying the CP signal through diode D0 switches from the state of maintaining the first level to the state of maintaining the second level, in response to the rising edge of the input signal voltage switching from the first level to the second level, the converted voltage signal at the control input terminal of the control chip has a predetermined type of transition edge switching from the first conversion level to the second conversion level, and in response to the predetermined type of transition edge, the control chip switches the signal output by the control chip from the first control level to the second control level.

[0075] For example, Figure 5 for Figure 4 A specific example circuit of the circuit shown, in Figure 5In this circuit, the input circuit 210 includes a comparator (used only for level conversion) as a voltage conversion circuit. When the level of the input signal is greater than the reference voltage level, the comparator outputs a high level signal (e.g., 5V), and vice versa. Furthermore, the control chip switches from a first control level (e.g., 0V) to a second control level (e.g., 5V) that is greater than the first control level, in response to the converted voltage signal at its control input terminal switching from a low level to a high level.

[0076] against Figure 5 In the structure shown, when the input signal obtained by rectifying the CP signal through diode D0 switches from maintaining the first level to maintaining the second level, when the input signal is at the first level (0V), the level of the converted voltage signal output by the comparator to the control input terminal of the control chip is also 0V; when the input signal switches to the second level (9V or 6V), the level of the converted voltage signal output by the comparator to the control input terminal of the control chip is 5V. Therefore, the converted voltage signal at the control input terminal of the control chip has a rising edge (a predetermined type of transition edge), and thus the signal at the output terminal of the control chip also switches from the first control level (0V) to the second control level (5V).

[0077] Furthermore, regarding the second state transition, when the input signal switches from a state maintaining the second level to a PWM signal state, in response to the rising edge of the input signal voltage switching from the lower level (i.e., the first PWM level) to the higher level (i.e., the second PWM level) of the two corresponding PWM signal levels, the converted voltage signal at the control input terminal of the control chip has a predetermined type of transition edge switching from the first transition level to the second transition level, and the control chip switches the signal output by the control chip from the first control level to the second control level based on the predetermined type of transition edge. The duration of the PWM period of the PWM signal is less than the duration corresponding to the reset condition of the control chip, so that the signal output by the control chip remains at the second control level during the duration of the PWM signal, that is, the control chip continuously outputs a signal with the second control level based on the periodic rising edges of the PWM signal.

[0078] Furthermore, after the duration of the PWM signal ends, the control chip responds to the fact that the duration during which the converted voltage signal does not have a rising edge is the duration corresponding to the reset condition of the control chip (i.e., the preset duration). In other words, the control chip outputs a signal with a second control level based on a predetermined type of transition edge in the converted voltage signal output by the voltage conversion circuit, and the duration exceeds the preset duration (no new predetermined type transition edge occurs after the preset duration from that predetermined type transition edge), and switches the signal output by the control chip from the second control level to the first control level, and maintains the first control level until the next predetermined type transition edge appears in the converted voltage signal.

[0079] Still with Figure 5 The specific circuit shown is illustrated. When the input signal voltage switches from the second level (9V or 6V) to the lower level (0V) of the PWM signal, the level of the converted voltage signal output from the comparator to the control input terminal of the control chip switches from 5V to 0V. However, the control chip only performs the output signal level switching operation based on the rising edge, so the control chip remains at the first control level and does not switch at this time. When the input signal voltage switches from the lower level (0V) of the PWM signal to the higher level (9V or 6V) of the PWM signal, the level of the converted voltage signal output from the comparator to the control input terminal of the control chip switches from 0V to 5V. Therefore, the converted voltage signal at the control input terminal of the control chip has a rising edge (a predetermined type of transition edge), and thus the signal at the output terminal of the control chip also switches from the first control level (0V) to the second control level (5V).

[0080] Furthermore, considering the specific logic within the control chip, after the first PWM pulse of the PWM signal, as described above, triggers the control chip to switch from the first control level to the second control level, the PWM signal periodically switches states, thus outputting a PWM pulse to the control input (watchdog input) every PWM cycle to reset the watchdog circuit's timer. This prevents the timer's duration from reaching the duration corresponding to the reset condition, allowing the control chip's output signal to remain at the second control level. If the PWM signal's state ends, resulting in no PWM pulse being provided at the control input (watchdog input) for a time interval exceeding the duration corresponding to the reset condition (i.e., the timer's duration exceeding the reset condition), the control chip outputs a reset signal (e.g., at the first control level). The control chip's output signal then remains at the first control level until the control input (watchdog input) receives the next predetermined type of transition edge.

[0081] Furthermore, regarding the third state transition, when the input signal switches from a state maintaining a first level to a PWM signal state, in response to the input signal voltage switching from a first level or a lower level of the PWM signal to a higher level of the PWM signal, the converted voltage signal at the control input terminal of the control chip has a predetermined type of transition edge switching from the first transition level to the second transition level, and the control chip switches the signal output by the control chip from the first control level to the second control level based on the predetermined type of transition edge. Similarly, the duration of the PWM period of the PWM signal is shorter than the duration corresponding to the reset condition of the control chip, so that the signal output by the control chip remains at the second control level during the duration of the PWM signal.

[0082] Still with Figure 5 The specific circuit shown is illustrated schematically. When the input signal voltage switches from the first level or the lower level (0V) of the PWM signal to the higher level (9V or 6V) of the PWM signal, the level of the converted voltage signal output from the comparator to the control input terminal of the control chip switches from 0V to 5V. Therefore, the converted voltage signal at the control input terminal of the control chip has a rising edge (a predetermined type of transition edge), and thus the signal at the output terminal of the control chip also switches from the first control level (0V) to the second control level (5V). Subsequently, when the input signal voltage switches from the higher level (9V or 6V) to the lower level (0V), the level of the converted voltage signal output from the comparator to the control input terminal of the control chip switches from 5V to 0V. However, the control chip performs the output signal level switching operation based on the rising edge, so the control chip remains at the second control level at this time.

[0083] Figure 6 It shows Figure 5 The measured results of the circuit shown.

[0084] Figure 6 As shown in Figure 3 The diagram shows the waveform of the input signal (i.e., the CP signal) of the input circuit 210, and also shows the measured signal of the input signal of the input circuit 210 and the output of the control chip 220.

[0085] like Figure 6As shown, each rising edge (UEG1, UEG2, UEG3) of the input signal corresponds to a corresponding rising edge in the second waveform. If the control chip's control input does not receive a new rising edge after the reset condition duration begins at the start of each rising edge, the voltage at the control chip's output will change from high level 5V to low level 0V again (as shown in the waveform corresponding to UEG1). Furthermore, during the duration of the PWM signal, since the PWM period is shorter than the reset condition duration, the control chip will continuously provide a watchdog signal during this period, thus keeping the voltage at the control chip's output high (5V) until the PWM signal's duration ends and a certain period (the reset condition duration) has elapsed. At this point, the voltage at the control chip's output will change from high level 5V to low level 0V again (not shown).

[0086] Therefore, from Figure 6 It can be seen that, Figure 5 The circuit shown can effectively detect various rising edges of the CP signal (or its conversion signal), and therefore can be used to detect the state switching of input signals associated with the CP signal, thus effectively waking up the circuit to be woken up.

[0087] Therefore, the charging wake-up circuit according to the embodiments of this application can detect various state transitions of the input signals corresponding to different charging wake-up modes, thereby generating a wake-up signal for each state transition to wake up the circuit to be woken up, so that the electric vehicle can be woken up in time for charging under various charging wake-up modes. Furthermore, the charging wake-up circuit is mainly implemented based on a control chip, which is simple in structure and can reduce costs.

[0088] According to another aspect of this application, an on-board charging device is also provided. This on-board charging device can be as follows: Figure 1 The electric vehicle shown includes an on-board charger (OBC). The on-board charger may include control circuitry (e.g., an MCU), and this control circuitry may be woken up by a charging wake-up circuit (internal or external to the on-board charger).

[0089] The charging wake-up circuit can be as described in the previous reference. Figures 2-6 The described charging wake-up circuit allows the control circuit to be woken up to control the charging process of the electric vehicle when it provides a wake-up signal to the control circuit.

[0090] Alternatively, in other embodiments, the on-board charging device may further include an auxiliary power supply, and the control circuit in the on-board charging device can obtain its operating voltage from the auxiliary power supply. When the electric vehicle is in a vehicle sleep state, the auxiliary power supply does not operate, thus not providing operating voltage to the control circuit, thereby saving power consumption of the control circuit. The charging wake-up circuit can be as described in the preceding reference. Figures 2-5 The described charging wake-up circuit allows the auxiliary power supply to resume providing operating voltage to the control circuit when it provides a wake-up signal to the auxiliary power supply, thus enabling the control circuit to control the charging process of the electric vehicle.

[0091] According to another aspect of this application, an electric drive system is also provided.

[0092] The electric drive system according to embodiments of this application may include an on-board charging device and a power conversion circuit (e.g., a three-phase inverter circuit). The on-board charging device may be an on-board charging device as described above, used to charge an energy storage device (e.g., a battery or supercapacitor external to the on-board charging device), and the power conversion circuit is used to generate drive power based on the power from the energy storage device to drive the motor to rotate.

[0093] According to another aspect of this application, a vehicle is also provided.

[0094] The vehicle according to an embodiment of this application may include an electric drive system, which may be an electric drive system as described above.

[0095] While the subject matter has been described in detail with respect to various specific exemplary embodiments, each example is provided by way of explanation rather than limitation. Those skilled in the art, upon receiving the foregoing understanding, will readily make changes, variations, and equivalents to such embodiments. Therefore, the invention does not exclude the inclusion of such modifications, variations, and / or additions to the subject matter that will be obvious to those skilled in the art. For example, features illustrated or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, it is intended that this disclosure cover such changes, variations, and equivalents.

[0096] Specifically, although the accompanying drawings of this disclosure depict steps performed in a specific order for illustrative and discussion purposes, the methods of this disclosure are not limited to the specific illustrated order or arrangement. Without departing from the scope of this disclosure, the various steps of the described methods may be omitted, rearranged, combined, and / or adjusted in various ways.

[0097] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms such as those defined in a common dictionary shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0098] The foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it. While several exemplary embodiments of the present disclosure have been described, those skilled in the art will readily understand that many modifications may be made to the exemplary embodiments without departing from the novel teachings and advantages of the present disclosure. Therefore, all such modifications are intended to be included within the scope of the present disclosure as defined by the claims. It should be understood that the foregoing description is intended to illustrate the present disclosure and should not be construed as limiting it to the specific embodiments disclosed, and modifications to the disclosed embodiments and other embodiments are intended to be included within the scope of the appended claims. The present disclosure is defined by the claims and their equivalents.

Claims

1. A charging wake-up circuit, comprising: an input circuit configured to receive an input signal originating from an external charging device, wherein the input signal is capable of state switching between a plurality of states; and a control chip configured to output a signal from a first control level to a second control level based on a rising edge of the input signal, to wake up a circuit to be woken up; wherein when the control chip outputs a signal with the second control level according to the rising edge of the input signal for more than a predetermined time length, the control chip outputs a signal from the second control level back to the first control level until the input circuit receives a next rising edge of the input signal, the state switching comprises one or more of the following: switching from a state holding a first level to a state holding a second level greater than the first level; switching from a state holding the second level to a state of a PWM signal; or switching from a state holding the first level to a state of the PWM signal.

2. The charge-wake-up circuit of claim 1, wherein, the input circuit comprises a voltage conversion circuit, the voltage conversion circuit is configured to convert a voltage of the input signal to a first conversion level or a second conversion level capable of being applied to the control chip; when the input signal state switches between a plurality of states, the voltage conversion circuit outputs a signal with a predetermined type of jump edge from the first conversion level to the second conversion level.

3. The charge-wake-up circuit of claim 2, wherein, the voltage conversion circuit comprises a comparator circuit, a first input of a comparator in the comparator circuit is applied with the input signal, a second input of the comparator is applied with a reference voltage level, and an output of the comparator is connected to a control input of the control chip; a first power supply end and a second power supply end of the comparator are applied with the first conversion level and the second conversion level; wherein when the level of the input signal is higher than the reference voltage level, the comparator outputs a signal with the second conversion level; when the level of the input signal is lower than the reference voltage level, the comparator outputs a signal with the first conversion level.

4. The charge-wake-up circuit of claim 1, wherein, when the circuit to be woken up is a falling edge trigger and the first control level is lower than the second control level, the wake-up circuit further comprises: a falling edge generation circuit configured to generate a wake-up signal with a falling edge in response to the signal output by the control chip switching from the first control level to the second control level.

5. The charge-wake-up circuit of claim 1, wherein, when the circuit to be woken up is a rising edge trigger and the first control level is higher than the second control level, the wake-up circuit further comprises: a rising edge generation circuit configured to generate a wake-up signal with a rising edge in response to the signal output by the control chip switching from the first control level to the second control level.

6. The charge-wake-up circuit of claim 2, wherein, in the case where the input signal switches from a state holding the first level to a state holding the second level, in response to the voltage of the input signal switching from the first level to the second level, the voltage conversion circuit outputs a signal with a predetermined type of jump edge from the first conversion level to the second conversion level, in response to the signal having the predetermined type of transition edge, the signal output from the control chip switches from the first control level to the second control level.

7. The charge-wake-up circuit of claim 2, wherein, when the input signal switches from a state of holding the first level or the second level to a state of the PWM signal, in response to the voltage of the input signal switching from the first level or the low level of the PWM signal to the high level of the PWM signal, the voltage conversion circuit outputs a signal having a predetermined type of transition edge that switches from the first conversion level to the second conversion level, and in response to the signal having the predetermined type of transition edge, the signal output from the control chip switches from the first control level to the second control level.

8. The charge-wake-up circuit of claim 7, wherein, when the input signal holds the state of the PWM signal, the control chip continuously outputs a signal having the second control level based on a periodic rising edge of the PWM signal. 9.The charge wake-up circuit according to claim 2, wherein, when the control chip outputs a signal having the second control level according to one predetermined type of transition edge output from the voltage conversion circuit and exceeds the predetermined time length, the output signal switches from the second control level back to the first control level and holds at the first control level until the control chip receives the next predetermined type of transition edge output from the voltage conversion circuit.

10. The charge-wake-up circuit of claim 1, wherein, the input signal is a converted signal of a control pilot (CP) signal output from an external charging device, the circuit to be woken up is a control circuit in a vehicle-mounted charging device, and the charge wake-up circuit is also provided in the vehicle-mounted charging device.

11. The charge-wake-up circuit of claim 1, wherein, the control chip is a watchdog control chip.

12. An on-board charging apparatus comprising: a control circuit, wherein the charge wake-up circuit according to any one of claims 1-11 is used to wake up the control circuit. 13.An electric drive system, comprising: a vehicle-mounted charging device according to claim 12, for charging an energy storage device; and a power conversion circuit, for generating drive power based on power from the energy storage device. 14.A vehicle, comprising: an electric drive system according to claim 13.

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