Charging control circuit

Abstract

The invention discloses a charging control circuit, and the circuit is characterized in that a PP signal transmission branch is used for accessing a PP signal, and transmitting the PP signal to a first PP signal end of a control module; the comparison module is used for accessing the PP signal and outputting a first preset signal when the PP signal is equal to the reference voltage; the control module is used for outputting a discharge enable signal when the CP oscillator is started so as to start the first discharge branch, outputting a discharge stop signal after the PP signal storage module executes initialization processing so as to turn off the first discharge branch, and obtaining a signal value of a second PP signal end when the comparison module outputs a first preset signal so as to turn off the first discharge branch; and if the signal value of the second PP signal end is a second preset signal and the PP signal storage module represents the first level characteristic, controlling the CP oscillator to stop. According to the invention, rapid, low-load and high-reliability detection of PP signal loss can be realized, and direct-current charging work can be stopped in time.

Description

Technical Field

[0001] This application relates to the technical field of DC charging for electric vehicles, and particularly to a charging control circuit. Background Art

[0002] In an electric vehicle DC charging system, monitoring the connection status between the charging gun and the vehicle is crucial. According to DC charging standards such as SAE J1772 - 202401, the PP (Proximity Pilot) signal can be used to detect whether the charging gun is reliably connected. When the charging gun is illegally unplugged or accidentally disconnected, the PP signal will be lost (Proximity Lost). At this time, the system needs to perform an emergency shutdown within an extremely short time (such as 10 milliseconds, etc.) to prevent the risk of high - voltage electric shock or equipment damage. In some traditional solutions, control modules such as MCUs can use software polling to detect the PP signal for corresponding charging control. In such solutions, if the polling period is short (such as 1 ms), it is easy to increase the load of the charging control system; if the period is too long (such as 5 ms or 10 ms, etc.), it may exceed the shutdown time limit in the standard, posing a safety hazard. It can be seen that traditional charging control schemes are difficult to balance the load problem and safety performance of the charging control system. Summary of the Invention

[0003] In view of this, this application provides a charging control circuit to solve the problem that traditional charging control schemes are difficult to balance the load problem and safety performance of the charging control system.

[0004] This application provides a charging control circuit, which includes a control module, a PP signal transmission branch, a comparison module, a PP signal storage module, and a first discharge branch; The PP signal transmission branch is respectively connected to the first PP signal terminal of the control module, the second PP signal terminal of the control module, the first end of the PP signal storage module, the first end of the first discharge branch, and the first input terminal of the comparison module; the second input terminal of the comparison module is used to access a reference voltage, and the output terminal is connected to the trigger signal input terminal of the control module; the second end of the PP signal storage module is grounded; the control end of the first discharge branch is connected to the discharge enable terminal of the control module, and the second end is grounded; The PP signal transmission branch is used to access the PP signal and transmit the PP signal to the first PP signal terminal of the control module; The comparison module is used to access the PP signal and output a first preset signal when the PP signal is equal to the reference voltage; The control module is used to output a discharge enable signal when the CP oscillator starts to turn on the first discharge branch, output a discharge stop signal after the PP signal storage module performs initialization processing to turn off the first discharge branch, and obtain the signal value of the second PP signal terminal when the comparison module outputs a first preset signal. If the signal value of the second PP signal terminal is a second preset signal and the PP signal storage module represents a first level characteristic, the CP oscillator is controlled to stop.

[0005] Optionally, the PP signal transmission branch includes a first buffer module and a second buffer module; the first end of the first buffer module is used to access the PP signal, and the second end is respectively connected to the first end of the second buffer module, the first end of the PP signal storage module, and the first end of the first discharge branch; the second end of the second buffer module is connected to the first PP signal terminal of the control module; the first buffer module is used to isolate and buffer the PP signal and the PP signal storage module; the second buffer module is used to isolate and buffer the PP signal storage module and the control module.

[0006] Optionally, the first buffer module includes a first operational amplifier, a first resistor, and a second resistor; the first end of the first resistor serves as the first end of the first buffer module, and the second end is connected to the positive input terminal of the first operational amplifier; the negative input terminal of the first operational amplifier is respectively connected to the output terminal of the first operational amplifier and the first end of the second resistor; the second end of the second resistor serves as the second end of the first buffer module.

[0007] Optionally, the second buffer module includes a second operational amplifier; the positive input terminal of the second operational amplifier serves as the first end of the second buffer module, and the negative input terminal is respectively connected to the output terminal of the second operational amplifier and the first PP signal terminal of the control module.

[0008] Optionally, the PP signal storage module includes a capacitor; the first end of the capacitor serves as the first end of the PP signal storage module, and the second end serves as the second end of the PP signal storage module.

[0009] Optionally, the first discharge branch includes a third resistor and a triode; the first end of the third resistor serves as the first end of the first discharge branch, and the second end is connected to the collector of the triode; the base of the triode serves as the control end of the first discharge branch, and the emitter serves as the second end of the first discharge branch.

[0010] Optionally, the comparison module includes a comparator; the positive input terminal of the comparator serves as the first input terminal of the comparison module, the negative input terminal serves as the second input terminal of the comparison module, and the output terminal serves as the output terminal of the comparison module.

[0011] Optionally, the charging control circuit further includes a second discharging branch; a first end of the second discharging branch is respectively connected to a second end of the first buffering module and a first end of the second buffering module, and a second end thereof is grounded.

[0012] Optionally, the second discharging branch includes a fourth resistor; a first end of the fourth resistor serves as the first end of the second discharging branch, and a second end thereof serves as the second end of the second discharging branch.

[0013] Optionally, the charging control circuit further includes a high-side drive switch; the control module is further configured to output a current interruption signal to the high-side drive switch when controlling the CP oscillator to stop; the high-side drive switch is configured to receive the current interruption signal and send the current interruption signal to the charging control unit, so that the charging control unit performs DC fast current interruption.

[0014] In the above charging control circuit of the present application, the comparison module may output a first preset signal when the PP signal is equal to the reference voltage Ref. The control module directly reads the signal value of the current PP signal when the comparison module outputs the first preset signal. If the signal value of the current PP signal is a second preset signal and the PP signal storage module characterizes a first level feature, the CP oscillator is controlled to stop within a first set time, so as to realize fast, low-load and high-reliability detection of the loss of the PP signal, timely stop the DC charging operation, meet the requirements for the emergency shutdown time under the SAE J1772 standard, and reduce the resource occupation caused by frequent sampling of the control module. In addition, the above charging control circuit can also be integrated into the existing EVSE control system, with strong compatibility and high adaptability. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a schematic structural diagram of a charging control circuit according to an embodiment of the present application; Figure 2 is a schematic structural diagram of a charging control circuit according to another embodiment of the present application; Figure 3 is a schematic structural diagram of a charging control circuit according to another embodiment of the present application; Figure 4 is a schematic structural diagram of a charging control circuit according to another embodiment of the present application; Figure 5It is a schematic structural diagram of a charging control circuit according to another embodiment of the present application.

[0017] Description of reference numerals: Detailed implementation manners

[0018] Next, in conjunction with the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. Without conflict, the following various embodiments and their technical features can be combined with each other.

[0019] The first aspect of the present application provides a charging control circuit, which can be disposed in a charging device and / or a charging control system of an electric vehicle. Refer to Figure 1 and Figure 2 As shown, the charging control circuit includes a control module 110, a PP signal transmission branch 120, a comparison module 130, a PP signal storage module 140, and a first discharge branch 150. Optionally, the control module 110 may include a main control chip with signal processing functions such as an MCU (Microcontroller Unit).

[0020] The PP signal transmission branch 120 is respectively connected to the first PP signal terminal ADC1 of the control module 110, the second PP signal terminal ADC2 of the control module 110, the first end of the PP signal storage module 140, the first end of the first discharge branch 150, and the first input end of the comparison module 130; specifically, the first end of the PP signal transmission branch 120 may be connected to the first input end of the comparison module 130 and the second PP signal terminal ADC2 of the control module 110, and is used to access the PP signal. The second end of the PP signal transmission branch 120 is respectively connected to the first end of the PP signal storage module 140 and the first end of the first discharge branch 150. The third end of the PP signal transmission branch 120 is connected to the first PP signal terminal ADC1. The second input end of the comparison module 130 is used to access the reference voltage Ref, and the output end of the comparison module 130 is connected to the trigger signal input end Int of the control module 110. The second end of the PP signal storage module 140 is grounded. The control end of the first discharge branch 150 is connected to the discharge enable end En of the control module 110, and the second end of the first discharge branch 150 is grounded. The ground terminal in this embodiment may be connected to the PE (Protective Earth) terminal of the control module 110.

[0021] Specifically, the first end of the PP signal transmission branch 120 is used to access the PP signal and transmit the PP signal to the first PP signal terminal ADC1 of the control module 110.

[0022] The comparison module 130 is used to access the PP signal and output a first preset signal when the PP signal is equal to the reference voltage Ref. Optionally, the reference voltage Ref can be a voltage value such as 0V for identifying an abnormal signal value of the PP signal. The first preset signal can include a low-level signal, that is, the comparison module 130 outputs a low-level signal when the PP signal is equal to the reference voltage Ref.

[0023] The control module 110 is used to output a discharge enable signal when the CP oscillator 210 starts, so as to turn on the first discharge branch 150, output a discharge stop signal after the PP signal storage module 140 performs initialization processing, so as to turn off the first discharge branch 150, and obtain the signal value of the second PP signal terminal ADC2 when the comparison module 130 outputs the first preset signal, that is, directly read the signal value of the current PP signal. If the signal value of the second PP signal terminal ADC2 is a second preset signal and the PP signal storage module 140 characterizes a first level feature, control the CP oscillator 210 to stop, so as to stop the DC charging operation in time. Optionally, the second preset signal includes a voltage signal such as 0V characterizing an abnormal signal value of the second PP signal terminal ADC2. Optionally, the first level feature can include the level feature at the PP signal storage module 140 when the high-side drive switch is not triggered during the charging process. This level feature can also be called the State-S3-Release level and can be characterized as 1.53V.

[0024] Optionally, the discharge enable signal can be a high-level signal, and the discharge stop signal can be a low-level signal, that is, the control module 110 is used to output a high-level signal at its discharge enable terminal En when the CP oscillator 210 starts, so as to output a discharge enable signal and turn on the first discharge branch 150, and output a low-level signal at its discharge enable terminal En after the PP signal storage module 140 performs initialization processing, so as to output a discharge stop signal and turn off the first discharge branch 150.

[0025] Optionally, refer Figure 2As shown, an output terminal of the control module 110 is connected to the CP oscillator 210. The control module 110 can obtain the signal value of the second PP signal terminal ADC2 when the comparison module 130 outputs a first preset signal, that is, directly read the signal value of the current PP signal. If the signal value of the current PP signal is the second preset signal and the PP signal storage module 140 represents a first level characteristic, it indicates that the current PP signal is lost or abnormal, and the high-side drive switch 220 is not triggered (that is, the user does not input a relevant instruction to stop charging). At this time, the control module 110 can output a signal to stop working to the CP oscillator 210 through the corresponding output terminal, so as to control the CP oscillator 210 to stop within a first set time (such as 10 ms, etc.).

[0026] In some examples, such as Figure 2 As shown, the charging control circuit further includes a high-side drive switch 220; the control module 110 is further configured to output a current interruption signal to the high-side drive switch 220 when controlling the CP oscillator 210 to stop; the high-side drive switch 220 is configured to receive the current interruption signal and send a current interruption signal to a charging control unit (abbreviated as CCU, not shown in the figure) for DC charging control, so that the charging control unit performs DC fast current interruption and reduces the output DC current to below 5 A within a second set time (such as 20 ms, etc.), ensuring the safety of relevant charging devices and / or charging control systems and improving the reliability of the charging process. In this example, when the PP signal is lost or abnormal, the control module 110 can cut off the power supply of the charging control unit through the high-side drive switch 220 while controlling the CP oscillator 210 to stop, realizing fast current interruption.

[0027] In the above charging control circuit, the comparison module 130 can output a first preset signal when the PP signal is equal to the reference voltage Ref. The control module 110 directly reads the signal value of the current PP signal when the comparison module 130 outputs the first preset signal. If the signal value of the current PP signal is the second preset signal and the PP signal storage module 140 represents a first level characteristic, it controls the CP oscillator 210 to stop within a first set time, so as to realize the fast detection of the loss of the PP signal, timely stop the DC charging work, and ensure the safety and reliability of the DC charging process.

[0028] In some embodiments, refer to Figure 3As shown, the PP signal transmission branch 120 includes a first buffer module 121 and a second buffer module 122. The first end of the first buffer module 121 serves as the first end of the PP signal transmission branch 120 for accessing the PP signal. The second end of the first buffer module 121 serves as the second end of the PP signal transmission branch 120 and is respectively connected to the first end of the second buffer module 122, the first end of the PP signal storage module 140, and the first end of the first discharge branch 150. The second end of the second buffer module 122 serves as the third end of the PP signal transmission branch 120 and is connected to the first PP signal terminal ADC1 of the control module 110. The first buffer module 121 is used to isolate and buffer the PP signal and the PP signal storage module 140 to improve the anti-interference ability of the PP signal storage module 140; the second buffer module 122 is used to isolate and buffer the PP signal storage module 140 and the control module 110 to improve the anti-interference ability of the PP signal storage module 140 and the control module 110.

[0029] In this embodiment, the PP signal accessed by the PP signal transmission branch 120 is transmitted to the control module 110 through the first buffer module 121 and the second buffer module 122 in sequence, which can avoid the direct coupling of components such as the control module 110 with the high-voltage charging equipment of the electric vehicle and improve the stability of components such as the control module 110 during operation.

[0030] In some examples, the first buffer module 121 can be implemented by using simple devices with buffer isolation functions. Specifically, as Figure 3 shown, the first buffer module 121 includes a first operational amplifier U1, a first resistor R1, and a second resistor R2. The first end of the first resistor R1 serves as the first end of the first buffer module 121 for accessing the PP signal. The second end of the first resistor R1 is connected to the positive input terminal (also referred to as the non-inverting input terminal) of the first operational amplifier U1; the negative input terminal (also referred to as the inverting input terminal) of the first operational amplifier U1 is respectively connected to the output terminal of the first operational amplifier U1 and the first end of the second resistor R2. The second end of the second resistor R2 serves as the second end of the first buffer module 121 and is respectively connected to the first end of the second buffer module 122, the first end of the PP signal storage module 140, and the first end of the first discharge branch 150.

[0031] In this example, the first buffer module 121 is formed by using these simple devices, namely the first operational amplifier U1, the first resistor R1, and the second resistor R2. On the basis of realizing the buffer isolation function, it can ensure the signal transmission efficiency and reduce the corresponding circuit cost.

[0032] In some examples, the second buffer module 122 can be implemented by using simple devices with buffer isolation functions. Specifically, asFigure 3 As shown, the second buffer module 122 includes a second operational amplifier U2. The positive input terminal of the second operational amplifier U2 serves as the first terminal of the second buffer module 122. The negative input terminal of the second operational amplifier U2 is respectively connected to the output terminal of the second operational amplifier U2 and the first PP signal terminal ADC1 of the control module 110; wherein the output terminal of the second operational amplifier U2 can serve as the second terminal of the second buffer module 122. In this example, the second buffer module 122 is formed by using a simple device, namely the second operational amplifier U2. On the basis of realizing the buffer isolation function, it can ensure the signal transmission efficiency and reduce the cost of the corresponding circuit.

[0033] In some embodiments, as Figure 3 and Figure 4 shown, the PP signal storage module 140 includes a capacitor C1; the first terminal of the capacitor C1 serves as the first terminal of the PP signal storage module 140 and is connected to the second terminal of the PP signal transmission branch 120, and the second terminal of the capacitor C1 serves as the second terminal of the PP signal storage module 140 and is connected to the ground terminal. The capacitor C1 can be used to record the peak voltage of the PP signal to characterize whether the high-side drive switch 220, as Figure 4 shown, is pressed.

[0034] Specifically, the high-side drive switch 220 includes an electronic switch for controlling the on / off of the positive power supply (high side), and it can directly manage the connection between the load and the power supply. Taking the Figure 4 shown charge control circuit as an example, its partial working process is further described. When the charging device of the electric vehicle is in the C state (i.e., when the CP oscillator 210 starts), the control module 110 pulls up the signal of the discharge enable terminal En, outputs a discharge enable signal, drives the first discharge branch 150 to conduct, and enables the capacitor C1 to discharge quickly. At this time, the capacitor C1 can be discharged within a third set time (such as 1 ms, etc.). After the third set time of outputting the discharge enable signal, the control module 110 pulls down the signal of the discharge enable terminal En again, outputs a discharge stop signal to turn off the first discharge branch 150, and completes the initialization of the capacitor C1. During the normal charging process of the charging device, the capacitor C1 can store energy and maintain at the peak level of the PP signal. Specifically, if the user does not press the high-side drive switch 220 (i.e., the high-side drive switch 220 is not triggered), at this time, the PP voltage represented by the capacitor C1 is the first level characteristic, about 1.53 V, and the corresponding capacitor C1 can also be called the State-S3-Release state; if the user presses the high-side drive switch 220 (i.e., the high-side drive switch 220 is triggered), at this time, the PP voltage represented by the capacitor C1 is the second level characteristic, about 2.77 V, and the corresponding capacitor C1 can also be called the State-S3-Depressed state.

[0035] In some embodiments, the first discharge branch 150 is used to quickly discharge the energy of the capacitor C1 in the PP signal storage module 140. As Figure 3 and Figure 4 shown, the first discharge branch 150 includes a third resistor R3 and a triode Q1; the first end of the third resistor R3 serves as the first end of the first discharge branch 150, and the second end of the third resistor R3 is connected to the collector of the triode Q1. The base of the triode Q1 serves as the control end of the first discharge branch 150 and is connected to the discharge enable end En of the control module 110, and the emitter of the triode Q1 serves as the second end of the first discharge branch 150 and is connected to the ground end. Specifically, when the control module 110 raises the signal of the discharge enable end En and outputs a discharge enable signal, the triode Q1 is turned on, that is, the first discharge branch 150 is turned on, and the capacitor C1 discharges quickly. When the control module 110 lowers the signal of the discharge enable end En and outputs a discharge stop signal, the triode Q1 is turned off, thereby turning off the first discharge branch 150, so as to realize the initialization of the capacitor C1.

[0036] Optionally, the third resistor R3 is a fast discharge resistor, and its discharge path can be controlled by the triode Q1. The resistance value of the third resistor R3 can be n*1 kΩ, where n can be a positive integer, for example, n is an integer between 1 and 10, etc.

[0037] In some embodiments, as Figure 3 and Figure 4 shown, the comparison module 130 includes a comparator U3; the comparator U3 can be a zero-level comparator. The positive input terminal (also called the in-phase input terminal) of the comparator U3 serves as the first input terminal of the comparison module 130 and is used to access the PP signal. The negative input terminal (also called the anti-phase input terminal) of the comparator U3 serves as the second input terminal of the comparison module 130 and is used to access the reference voltage Ref. The output terminal of the comparator U3 serves as the output terminal of the comparison module 130 and is connected to the trigger signal input terminal Int of the control module 110. Specifically, the reference voltage Ref can be 0V. The positive input terminal of the comparison module 130 accesses the PP signal, and the negative input terminal accesses the reference voltage Ref. During the normal charging process of the charging device, the voltage corresponding to the PP signal is greater than the reference voltage Ref, and the comparator U3 outputs a high-level signal. When the PP signal is lost or abnormal, the corresponding voltage can be 0V (i.e., the ground level). At this time, the comparator U3 outputs a low-level signal (i.e., the first preset signal) to trigger the fast interruption processing flow. In this embodiment, the comparator U3 is used to implement the PP signal detection function of the comparison module 130, which can ensure the detection efficiency and enable the control module 110 to timely obtain the loss or abnormal condition of the PP signal.

[0038] In some embodiments, refer to Figure 5As shown, the charging control circuit further includes a second discharging branch 160. The first end of the second discharging branch 160 is respectively connected to the second end of the first buffer module 121 and the first end of the second buffer module 122, and the second end is grounded. The second discharging branch 160 is used to slowly discharge the energy of the capacitor C1 in the PP signal storage module 140. That is to say, the speed of the second discharging branch 160 discharging energy is less than the speed of the first discharging branch 150 discharging energy, so that the signal change at the capacitor C1 is smoother.

[0039] In some examples, the second discharging branch 160 includes a fourth resistor R4; the first end of the fourth resistor R4 serves as the first end of the second discharging branch 160 and is respectively connected to the second end of the first buffer module 121 and the first end of the second buffer module 122; the second end of the fourth resistor R4 serves as the second end of the second discharging branch 160 and is connected to the ground terminal. In this example, the fourth resistor R4 is a slow discharging resistor, which can make the PP signal storage module 140 or the capacitor C1 therein slowly fall back to a stable state. Optionally, the resistance value of the fourth resistor R4 can be n * 100 kΩ (kiloohm); where n can be a positive integer, for example, n is an integer between 1 and 10, etc.

[0040] Specifically, take Figure 5Taking the charging control circuit shown as an example to illustrate its working process. When the charging device of the electric vehicle is in state C (i.e., when the CP oscillator 210 starts), the control module 110 raises the signal of the discharge enable terminal En to output a discharge enable signal, driving the triode Q1 in the first discharge branch 150 to conduct, enabling the capacitor C1 to discharge rapidly. At this time, the capacitor C1 can complete discharge within the third set time (such as 1 ms, etc.). After the third set time of outputting the discharge enable signal, the control module 110 then lowers the signal of the discharge enable terminal En to output a discharge stop signal to turn off the triode Q1, completing the initialization of the capacitor C1. During the normal charging process of the charging device, the capacitor C1 can store energy and maintain at the peak level of the PP signal. Specifically, if the user does not press the high-side drive switch 220, at this time, the capacitor C1 can be in the State-S3-Release state, and the PP voltage represented at the capacitor C1 is the first level characteristic, about 1.53 V; if the user presses the high-side drive switch 220, at this time, the capacitor C1 can be in the State-S3-Depressed state, and the PP voltage represented at the capacitor C1 is the second level characteristic, about 2.77 V. If the PP signal is lost or abnormal, the signal (i.e., the PP signal) connected to the positive input terminal of the comparator U3 drops to 0 V, and the comparator U3 outputs a low-level signal (i.e., the first preset signal). When the control module 110 receives a low-level signal at its trigger signal input terminal Int, it immediately obtains the level characteristic of the capacitor C1 connected to the first PP signal terminal ADC1 and the signal value of the second PP signal terminal ADC2 (i.e., directly reads the signal value of the current PP signal). If the PP signal value of the second PP signal terminal ADC2 is 0 V and the capacitor C1 has the first level characteristic (such as 1.53 V), it immediately controls the CP oscillator 210 to stop and outputs a current interruption signal to the high-side drive switch 220; after receiving the current interruption signal, the high-side drive switch 220 sends a current interruption signal to the charging control unit, enabling the charging control unit to perform a direct current rapid current interruption, reducing the output direct current to below 5 A within the second set time (such as 20 ms, etc.), ensuring the safety of relevant charging devices and / or charging control systems, and improving the reliability of the charging process. It can be seen that Figure 5 The charging control circuit shown can provide a novel method for quickly detecting the loss of PP, enabling real-time hardware monitoring of the PP signal without frequent software polling, reducing the system load while meeting the emergency shutdown requirement within 10 ms.

[0041] In the above charging control circuit, the comparison module 130 can output a first preset signal when the PP signal is equal to the reference voltage Ref. When the comparison module 130 outputs the first preset signal, the control module 110 directly reads the signal value of the current PP signal. If the signal value of the current PP signal is the second preset signal and the PP signal storage module 140 represents the first level characteristic, the CP oscillator 210 is controlled to stop within the first set time, so as to realize fast, low-load and high-reliability detection of the loss of the PP signal, stop the DC charging operation in time, meet the requirements for the emergency shutdown time under the SAE J1772 standard, and reduce the resource occupation caused by the frequent sampling of the control module 110. In addition, the above charging control circuit can be integrated into the existing EVSE (electric vehicle supply equipment) control system, with strong compatibility and high adaptability.

[0042] In the second aspect of the present application, a charging device is provided, and the charging device includes the charging control circuit described in any of the above embodiments.

[0043] The above charging device includes the charging control circuit described in any of the above embodiments, and has all the beneficial effects of the charging control circuit described in any of the foregoing embodiments, which will not be elaborated herein.

[0044] In the third aspect of the present application, an electric vehicle is provided, and the electric vehicle includes the charging control circuit described in any of the above embodiments and / or the charging device described in any of the above embodiments.

[0045] The above electric vehicle includes the charging control circuit described in any of the above embodiments and / or the charging device described in any of the above embodiments, and has all the beneficial effects of the charging control circuit described in any of the foregoing embodiments, which will not be elaborated herein.

[0046] Although the present application has been shown and described with respect to one or more implementations, those skilled in the art will envision equivalent variations and modifications based on a reading and understanding of this specification and the drawings. The present application includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the above components, the terms used to describe such components are intended to correspond to any component (unless otherwise indicated) that performs the specified function of the component (e.g., it is functionally equivalent), even if structurally different from the disclosed structure that performs the functions in the exemplary implementations of the present specification shown herein.

[0047] That is, the above description is only the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, such as the mutual combination of technical features between the embodiments, or directly or indirectly applied to other related technical fields, are equally included in the patent protection scope of the present application.

[0048] In addition, in the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, for structural elements with the same or similar characteristics, the present application may use the same or different reference numerals for identification. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0049] In the present application, the term "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in the present application is not necessarily to be construed as more preferred or more advantageous than other embodiments. The above description is given to enable any person skilled in the art to make and use the present application. In the above description, various details are set forth for purposes of explanation. It should be understood that those skilled in the art can recognize that the present application can be implemented without the use of these specific details. In other embodiments, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.

Claims

1. A charging control circuit, characterized in that: The charging control circuit includes a control module, a PP signal transmission branch, a comparison module, a PP signal storage module and a first discharge branch; The PP signal transmission branch is respectively connected to the first PP signal terminal of the control module, the second PP signal terminal of the control module, the first terminal of the PP signal storage module, the first terminal of the first discharge branch and the first input terminal of the comparison module; the second input terminal of the comparison module is used to access the reference voltage, and the output terminal is connected to the trigger signal input terminal of the control module; the second terminal of the PP signal storage module is grounded; the control terminal of the first discharge branch is connected to the discharge enable terminal of the control module, and the second terminal is grounded; The PP signal transmission branch is used to access the PP signal and transmit the PP signal to the first PP signal terminal of the control module; The comparison module is used to access the PP signal, and output a first preset signal when the PP signal is equal to the reference voltage; The control module is used to output a discharge enable signal when the CP oscillator is started to turn on the first discharge branch, output a discharge stop signal after the PP signal storage module performs initialization processing to turn off the first discharge branch, and obtain a signal value of the second PP signal terminal when the comparison module outputs the first preset signal, and control the CP oscillator to stop if the signal value of the second PP signal terminal is a second preset signal and the PP signal storage module is characterized by a first level feature.

2. The charging control circuit according to claim 1, characterized in that: The PP signal transmission branch includes a first buffer module and a second buffer module; The first end of the first buffer module is used to access the PP signal, and the second end is respectively connected to the first end of the second buffer module, the first end of the PP signal storage module and the first end of the first discharge branch; the second end of the second buffer module is connected to the first PP signal end of the control module; The first buffer module is used to isolate and buffer the PP signal and the PP signal storage module; The second buffer module is used to isolate and buffer the PP signal storage module and the control module.

3. The charging control circuit according to claim 2, characterized in that: The first buffer module includes a first operational amplifier, a first resistor and a second resistor; The first end of the first resistor serves as the first end of the first buffer module, and the second end is connected to the positive input end of the first operational amplifier; the negative input end of the first operational amplifier is respectively connected to the output end of the first operational amplifier and the first end of the second resistor; the second end of the second resistor serves as the second end of the first buffer module.

4. The charging control circuit according to claim 2, characterized in that: The second buffer module includes a second operational amplifier; The positive input terminal of the second operational amplifier serves as the first terminal of the second buffer module, and the negative input terminal is respectively connected to the output terminal of the second operational amplifier and the first PP signal terminal of the control module.

5. The charging control circuit according to claim 2, characterized in that: The PP signal storage module includes a capacitor; The first end of the capacitor serves as the first end of the PP signal storage module, and the second end of the capacitor serves as the second end of the PP signal storage module.

6. The charging control circuit according to claim 2, characterized in that: The first discharge branch includes a third resistor and a triode; The first end of the third resistor serves as the first end of the first discharge branch, and the second end is connected to the collector of the transistor; the base of the transistor serves as the control end of the first discharge branch, and the emitter serves as the second end of the first discharge branch.

7. The charging control circuit according to claim 2, characterized in that: The comparison module includes a comparator; The positive input terminal of the comparator serves as the first input terminal of the comparison module, the negative input terminal serves as the second input terminal of the comparison module, and the output terminal serves as the output terminal of the comparison module.

8. The charging control circuit according to claim 2, characterized in that: The charging control circuit also includes a second discharge branch; The first end of the second discharge branch is respectively connected to the second end of the first buffer module and the first end of the second buffer module, and the second end is grounded.

9. The charging control circuit according to claim 8, characterized in that: The second discharge branch includes a fourth resistor; The first end of the fourth resistor serves as the first end of the second discharge branch, and the second end of the fourth resistor serves as the second end of the second discharge branch.

10. The charging control circuit according to any one of claims 1 to 9, characterized in that: The charging control circuit also includes a high-side drive switch; The control module is also used to output a current cut-off signal to the high-side drive switch when controlling the CP oscillator to stop; The high-side drive switch is used to receive the cut-off signal and send the cut-off signal to the charging control unit, so that the charging control unit performs a DC fast cut-off.

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