CN114264971B - Signal detection circuit and vehicle-mounted charger - Google Patents
Signal detection circuit and vehicle-mounted charger Download PDFInfo
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- CN114264971B CN114264971B CN202111593213.6A CN202111593213A CN114264971B CN 114264971 B CN114264971 B CN 114264971B CN 202111593213 A CN202111593213 A CN 202111593213A CN 114264971 B CN114264971 B CN 114264971B
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Abstract
The embodiment of the application provides a signal detection circuit and a vehicle-mounted charger, wherein the signal detection circuit comprises a detection chip, a first resistor module, a second resistor module and a third resistor module, a signal output end of the detection chip is connected with a first end of the first resistor module, a second end of the first resistor module is connected with a first end of the second resistor module, a first end of the third resistor module and a signal detection end of the detection chip, a control guidance function CP signal is input to a second end of the second resistor module, and a second end of the third resistor module is grounded; when the CP signal is open, the first resistor module and the third resistor module are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module and the third resistor module are connected in series to form a second voltage dividing circuit; the detection chip is used for determining whether the CP signal is abnormal or not according to the amplitude of the partial pressure signal detected by the signal detection end. The embodiment of the application can timely detect the abnormality of the CP signal.
Description
Technical Field
The application relates to the technical field of electronic circuits, in particular to a signal detection circuit and a vehicle-mounted charger.
Background
In recent years, with rapid development of new energy automobile industry, corresponding matched power supply equipment (such as a charging pile) is increasingly established, wherein the power supply equipment can communicate with an automobile through control guidance function (control pilot function, CP) signals sent by a charging gun, and can realize communication functions of connection determination, charging current determination, start and stop charging and the like.
The maximum power supply current of the current power supply equipment can be confirmed through the CP signal of the charging gun by the vehicle-mounted charger on the automobile, and when the CP signal is abnormal, if the CP signal is not detected timely, the vehicle-mounted charger can not charge the vehicle battery.
Disclosure of Invention
The embodiment of the application provides a signal detection circuit and a vehicle-mounted charger, which can timely detect the abnormality of a CP signal.
The first aspect of the embodiment of the application provides a signal detection circuit, which comprises a detection chip, a first resistor module, a second resistor module and a third resistor module, wherein the signal output end of the detection chip is connected with the first end of the first resistor module, the second end of the first resistor module is connected with the first end of the second resistor module, the first end of the third resistor module and the signal detection end of the detection chip, the second end of the second resistor module inputs a control guidance function CP signal, and the second end of the third resistor module is grounded;
When the CP signal is open, the first resistor module and the third resistor module are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module and the third resistor module are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module and the second resistor module form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio, the product of the amplitude of the CP signal when the CP signal is normal and the product of the second voltage division ratio are different from each other, the first voltage division ratio comprises the voltage division ratio of the third resistor module on the first voltage division circuit, the second voltage division ratio comprises the product of the voltage division ratio of the third resistor module on the second voltage division circuit, and the third voltage division ratio comprises the product of the voltage division ratio of the second resistor module on the third voltage division circuit; and the detection chip is used for determining whether the CP signal is abnormal or not according to the amplitude of the partial pressure signal detected by the signal detection end.
Optionally, the detection chip is further configured to notify a vehicle control system through a CAN bus under the condition that the CP signal is abnormal.
Optionally, the first resistor module includes a first resistor and a first diode; the first end of the first resistor is connected with the first end of the first resistor module, the second end of the first resistor is connected with the positive electrode of the first diode, and the negative electrode of the first diode is connected with the second end of the first resistor module.
Optionally, the second resistor module includes a second resistor, a first end of the second resistor is connected to the first end of the second resistor module, and a second end of the second resistor is connected to the second end of the second resistor module.
Optionally, the third resistor module includes a third resistor and a second diode, an anode of the second diode is connected to the first end of the third resistor module, a cathode of the second diode is connected to the first end of the third resistor, and a second end of the third resistor is connected to the second end of the third resistor module.
Optionally, the amplitude of the reference signal output by the signal output end is smaller than the amplitude of the CP signal when it is normal, the voltage division ratio of the second resistor module on the third voltage division circuit is smaller than the voltage division ratio of the third resistor module on the first voltage division circuit, the voltage division ratio of the third resistor module on the first voltage division circuit is smaller than the voltage division ratio of the third resistor module on the second voltage division circuit, and the detecting chip determines whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detecting end, including:
Under the condition that the amplitude of the partial pressure signal is larger than a first threshold value, determining that the CP signal is normal;
and determining that the CP signal is abnormal under the condition that the amplitude of the partial pressure signal is smaller than the first threshold value.
Optionally, the determining that the CP signal is abnormal in the case that the amplitude of the divided signal is smaller than the first threshold includes:
determining that the CP signal is an open circuit signal when the magnitude of the divided signal is less than the first threshold value and the magnitude of the divided signal falls within a first voltage interval;
determining that the CP signal is a short-circuit signal when the amplitude of the divided signal is less than the first threshold value and the amplitude of the divided signal falls within a second voltage interval; the upper limit value of the first voltage interval is smaller than or equal to the first threshold value, the lower limit value of the first voltage interval is larger than or equal to the upper limit value of the second voltage interval, and the lower limit value of the second voltage interval is larger than or equal to 0.
The second aspect of the embodiment of the application provides a signal detection circuit, which comprises a first detection chip, a second detection chip, a first resistance module, a second resistance module and a third resistance module, wherein the signal output end of the first detection chip is connected with the first end of the first resistance module, the second end of the first resistance module is connected with the first end of the second resistance module, the first end of the third resistance module and the signal detection end of the second detection chip, the second end of the second resistance module inputs a CP signal, and the second end of the third resistance module is grounded;
When the CP signal is open, the first resistor module and the third resistor module are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module and the third resistor module are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module and the second resistor module form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio, the product of the amplitude of the CP signal when the CP signal is normal and the product of the second voltage division ratio are different from each other, the first voltage division ratio comprises the voltage division ratio of the third resistor module on the first voltage division circuit, the second voltage division ratio comprises the product of the voltage division ratio of the third resistor module on the second voltage division circuit, and the third voltage division ratio comprises the product of the voltage division ratio of the second resistor module on the third voltage division circuit; the second detection chip is used for determining whether the CP signal is abnormal or not according to the amplitude of the partial pressure signal detected by the signal detection end.
Optionally, the second detection chip is configured to notify a vehicle control system through a CAN bus in a case that the CP signal is abnormal.
A third aspect of an embodiment of the present application provides a vehicle-mounted charger, including the signal detection circuit described in the first aspect or the second aspect.
The signal detection circuit comprises a detection chip, a first resistor module, a second resistor module and a third resistor module, wherein a signal output end of the detection chip is connected with a first end of the first resistor module, a second end of the first resistor module is connected with a first end of the second resistor module, a first end of the third resistor module and a signal detection end of the detection chip, a control guidance function CP signal is input to a second end of the second resistor module, and a second end of the third resistor module is grounded;
when the CP signal is open, the first resistor module and the third resistor module are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module and the third resistor module are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module and the second resistor module form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio, the product of the amplitude of the CP signal when the CP signal is normal and the product of the second voltage division ratio are different from each other, the first voltage division ratio comprises the voltage division ratio of the third resistor module on the first voltage division circuit, the second voltage division ratio comprises the product of the voltage division ratio of the third resistor module on the second voltage division circuit, and the third voltage division ratio comprises the product of the voltage division ratio of the second resistor module on the third voltage division circuit; and the detection chip is used for determining whether the CP signal is abnormal or not according to the amplitude of the partial pressure signal detected by the signal detection end.
According to the signal detection circuit provided by the embodiment of the application, when the CP signal is normal, the amplitude of the divided voltage signal detected by the signal detection end is the divided voltage of the CP signal on the second divided voltage circuit; when the CP signal is open, the amplitude of the divided voltage signal detected by the signal detection end is the divided voltage of the reference signal output by the signal output end on the first divided voltage circuit; when the CP signal is short-circuited, the amplitude of the divided voltage signal detected by the signal detection end is the divided voltage of the reference signal output by the signal output end on the third divided voltage circuit. Because the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio (the voltage division ratio of the third resistor module on the first voltage division circuit) is not equal to the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio (the voltage division ratio of the third resistor module on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio (the voltage division ratio of the second resistor module on the third voltage division circuit) is not equal to the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio (the voltage division ratio of the third resistor module on the second voltage division circuit), the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio (the voltage division ratio of the third resistor module on the first voltage division circuit) is not equal to the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio (the voltage division ratio of the second resistor module on the third voltage division circuit), so that the amplitudes of the voltage division signals detected by the signal detection end are different when the CP signal is normal, when the CP signal is open and when the CP signal is short-circuited, the detection chip can determine whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detection end, and can detect the abnormality of the CP signal in time.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the application and that other drawings may be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a signal detection circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a CP signal according to an embodiment of the present application;
fig. 3 is a schematic diagram of another signal detection circuit according to an embodiment of the present application;
fig. 4 is a schematic diagram of a specific structure of a signal detection circuit according to an embodiment of the present application;
fig. 5 is a schematic diagram of another signal detection circuit according to an embodiment of the present application;
fig. 6 is a schematic diagram of another signal detection circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram of a specific structure of another signal detection circuit according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a vehicle-mounted charger according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terms first, second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, article, or apparatus.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic diagram of a signal detection circuit according to an embodiment of the application. As shown in fig. 1, the signal detection circuit 100 includes a detection chip 10, a first resistor module 20, a second resistor module 30, and a third resistor module 40; the signal output end 11 of the detection chip 10 is connected to the first end of the first resistor module 20, the second end of the first resistor module 20 is connected to the first end of the second resistor module 30, the first end of the third resistor module 40 and the signal detection end 12 of the detection chip 10, the second end of the second resistor module 30 inputs a control pilot function CP signal, and the second end of the third resistor module 40 is grounded;
when the CP signal is open, the first resistor module 20 and the third resistor module 40 are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module 30 and the third resistor module 40 are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module 20 and the second resistor module 30 form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output terminal 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit) is not equal to the product of the amplitude of the CP signal when it is normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output terminal 11 and the third voltage division ratio (the voltage division ratio of the second resistor module 30 on the third voltage division circuit) is not equal to the product of the amplitude of the CP signal when it is normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output terminal 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit) is not equal to the product of the amplitude of the reference signal output by the signal output terminal 11 and the third voltage division ratio (the voltage division ratio of the second resistor module 30 on the third voltage division circuit);
The detection chip 10 is configured to determine whether the CP signal is abnormal according to the amplitude of the divided signal detected by the signal detection terminal 12.
The CP signal abnormality may include a CP signal short circuit (CP signal-to-ground short circuit) or a CP signal open circuit.
In the embodiment of the application, the power supply equipment (for example, the charging pile) can send a control guiding function (control pilot function, CP) signal to the vehicle-mounted charger through the charging gun, and the CP signal can realize communication functions of connection determination, charging current determination, start and stop charging and the like. The maximum power supply current of the current power supply equipment can be confirmed through the CP signal of the charging gun by the vehicle-mounted charger on the vehicle, and when the CP signal is abnormal, if the CP signal cannot be timely detected, the vehicle-mounted charger cannot charge a vehicle battery (such as a high-voltage power battery), and the feeding of the vehicle battery can be possibly caused, so that the user experience is affected.
The CP signal may be a pulse width modulation (pulse width modulation, PWM) signal, and the vehicle-mounted charger may confirm the maximum supply current of the current supply device through the PWM duty ratio of the CP signal of the charging gun, and the PWM waveform may be referred to in fig. 2. Fig. 2 is a schematic diagram of a CP signal according to an embodiment of the present application. As shown in FIG. 2, the period of the CP signal is T, and the period of the CP signal at +Vcc is T in one period 1 The PWM duty cycle of the CP signal d=t 1 /T。
The embodiment of the application provides a corresponding relation table of working states and charging currents corresponding to different PWM duty ratios, and the table is shown in the following table 1.
TABLE 1
As can be seen from table 1, when the PWM duty ratio D is located in different intervals, it indicates different meanings, and if the CP signal is abnormal, it affects not only the establishment of the communication connection between the charging pile and the electric vehicle, but also the maximum charging current, and also whether charging is possible.
In the embodiment of the present application, in the process of detecting whether the CP signal is abnormal, the signal detecting circuit 100 may output a reference signal through the signal output terminal 11, where the reference signal may be a dc level or a PWM square wave. For example, the detection chip 1 may be a chip capable of sending out a PWM signal, and the pin corresponding to the signal output terminal 11 may drive and output a 5V dc level or PWM square wave.
The first resistor module 20 may be a pure resistor module consisting of at least one resistor, or may be a module consisting of at least one resistor and at least one diode. The first resistor module 20 includes resistors that can have current limiting and voltage dividing effects and can be used to limit the current in the detection circuit 100. The magnitude of the resistor included in the first resistor module 20 is positively correlated with the magnitude of the voltage divided by the first resistor module 20 in the corresponding voltage dividing circuit (including the first voltage dividing circuit or the third voltage dividing circuit). The diode included in the first resistor module 20 has unidirectional conduction, so that the signal output end 11 only sends out reference signals outwards, external signals cannot flow backward to the signal output end 11 through the first resistor module 20, and the reference signals sent out by the signal output end 11 are not disturbed.
The second resistor module 30 may be a pure resistor module consisting of at least one resistor. The second resistor module 30 may include resistors that have current limiting and voltage dividing effects and may be used to limit the current in the detection circuit 100, where the magnitude of the resistor included in the second resistor module 30 is positively correlated with the magnitude of the voltage divided by the second resistor module 30 in the corresponding voltage dividing circuit.
The third resistor module 40 may be a pure resistor module consisting of at least one resistor, or may be a module consisting of at least one resistor and at least one diode. The third resistor module 40 includes resistors that can have current limiting and voltage dividing effects and can be used to limit the current in the detection circuit 100. The magnitude of the resistor included in the third resistor module 40 is positively correlated with the magnitude of the voltage divided by the third resistor module 40 in the corresponding voltage dividing circuit. The diode included in the third resistor module 40 has unidirectional conduction, so that the signal output end 11 can only transmit signals outwards through the first resistor module 20, external signals cannot flow backwards to the signal output end 11 through the third resistor module 40, and reference signals transmitted by the signal output end 11 are not disturbed.
When the CP signal is open, the first resistor module 20 and the third resistor module 40 are connected in series to form a first voltage divider circuit. At this time, the second resistor module 30 is equivalent to being disconnected, the CP signal does not enter the signal detection circuit 100, the reference signal output by the signal output end 11 does not pass through the second resistor module 30, the reference signal output by the signal output end 11 passes through the first resistor module 20 and the third resistor module 40, and since the signal detection end 12 of the detection chip 10 is connected to the second end of the first resistor module 20 and the first end of the third resistor module 40, the amplitude of the signal detected by the signal detection end 12 is the partial voltage of the amplitude of the reference signal output by the signal output end 11 on the third resistor module 40 of the first voltage division circuit.
When the CP signal is normal, the second resistor module 30 and the third resistor module 40 are connected in series to form a second voltage dividing circuit. At this time, the CP signal passes through the second resistor module 30 and the third resistor module 40, and since the signal detecting end 12 of the detecting chip 10 is connected to the first end of the second resistor module 30 and the first end of the third resistor module 40, the amplitude of the signal detected by the signal detecting end 12 is the voltage division magnitude of the amplitude of the CP signal on the third resistor module 40 of the second voltage division circuit.
When the CP signal is short-circuited, if the third resistor module 40 may be a pure resistor module composed of at least one resistor, the second resistor module 30 and the third resistor module 40 are connected in parallel and then form a third voltage dividing circuit with the first resistor module 20. At this time, the second resistor module 30 and the third resistor module 40 are equivalent to parallel connection due to the short circuit of the CP signal, the CP signal does not enter the signal detection circuit 100, and the reference signal output from the signal output terminal 11 passes through the first resistor module 20, the second resistor module 30 and the third resistor module 40. If the third resistor module 40 is a module consisting of at least one resistor and at least one diode, the first resistor module 20 and the second resistor module 30 form a third voltage dividing circuit. At this time, the CP signal does not enter the signal detection circuit 100 due to the short circuit of the CP signal, and the reference signal output from the signal output terminal 11 passes through the first resistor module 20 and the second resistor module 30. Since the signal detecting terminal 12 of the detecting chip 10 is connected to the second terminal of the first resistor module 20 and the first terminal of the second resistor module 30, the amplitude of the signal detected by the signal detecting terminal 12 is the divided voltage of the amplitude of the reference signal output by the signal output terminal 11 on the third resistor module 40 of the third voltage dividing circuit.
In the embodiment of the present application, the voltage division ratio of the third resistor module 40 on the first voltage division circuit=the resistance value of the third resistor module 40/(the resistance value of the first resistor module 20+the resistance value of the third resistor module 40). The voltage division ratio of the third resistor module 40 on the second voltage division circuit=the resistance value of the third resistor module 40/(the resistance value of the second resistor module 30+the resistance value of the third resistor module 40). The voltage division ratio of the second resistor module 30 on the third voltage division circuit=the resistance value of the second resistor module 30/(the resistance value of the second resistor module 30+the resistance value of the third resistor module 40).
In the signal detection circuit 100 of the embodiment of the present application, when the CP signal is normal, the amplitude of the divided voltage signal detected by the signal detection end 12 is the divided voltage of the CP signal on the second voltage division circuit; when the CP signal is open, the amplitude of the divided voltage signal detected by the signal detection end is the divided voltage of the reference signal output by the signal output end on the first divided voltage circuit; when the CP signal is short-circuited, the amplitude of the divided voltage signal detected by the signal detection end is the divided voltage of the reference signal output by the signal output end on the third divided voltage circuit. Because the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio (the voltage division ratio of the third resistor module on the first voltage division circuit) is not equal to the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio (the voltage division ratio of the third resistor module on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio (the voltage division ratio of the second resistor module on the third voltage division circuit) is not equal to the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio (the voltage division ratio of the third resistor module on the second voltage division circuit), the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio (the voltage division ratio of the third resistor module on the first voltage division circuit) is not equal to the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio (the voltage division ratio of the second resistor module on the third voltage division circuit), so that the amplitudes of the voltage division signals detected by the signal detection end are different when the CP signal is normal, when the CP signal is open and when the CP signal is short-circuited, the detection chip can determine whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detection end, and can detect the abnormality of the CP signal in time.
Optionally, the detection chip 10 is further configured to notify a vehicle control system through a CAN bus in the case that the CP signal is abnormal. Referring to fig. 3, fig. 3 is a schematic diagram of another signal detection circuit according to an embodiment of the application. As shown in fig. 3, the detection chip 10 may be connected to the vehicle control system 200 through a controller area network (controller area network, CAN) bus. Since the detection chip 10 of the signal detection circuit 100 CAN be directly connected with the vehicle control system 200 through the CAN bus, when the signal detection circuit 100 detects that the CP line falls off (CP signal is open) or is short-circuited to ground (CP signal is short-circuited), the detection chip 10 CAN directly feed back to the vehicle control system 200 (i.e., the whole vehicle) through the CAN bus, and the whole vehicle CAN receive the problem feedback about the CP signal at the first time. When the whole vehicle detects that the CP signal is abnormal, the whole vehicle can inform a driver to plug the charging gun again or replace charging equipment (such as a charging pile) so as to avoid charging failure.
Referring to fig. 4, fig. 4 is a schematic diagram of a specific structure of a signal detection circuit according to an embodiment of the application. As shown in fig. 4, the first resistor module 20 includes a first resistor R1 and a first diode D1; the first end of the first resistor R1 is connected to the first end of the first resistor module 20, the second end of the first resistor R1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the second end of the first resistor module 20. The first resistor module 20 in fig. 4 may further include at least one other resistor connected in series or parallel with the first resistor R1. The positions of the first resistor R1 and the first diode D1 in fig. 4 may be interchanged.
As shown in fig. 4, the second resistor module 30 includes a second resistor R2, a first end of the second resistor R2 is connected to the first end of the second resistor module 30, and a second end of the second resistor R2 is connected to the second end of the second resistor module 30. The second resistor module 30 in fig. 4 may further include at least one other resistor connected in series or parallel with the second resistor R2.
As shown in fig. 4, the third resistor module 40 includes a third resistor R3 and a second diode D2, where an anode of the second diode D2 is connected to the first end of the third resistor module 40, a cathode of the second diode D2 is connected to the first end of the third resistor R3, and a second end of the third resistor R3 is connected to the second end of the third resistor module 40. The third resistor module 40 in fig. 4 may further include at least one other resistor connected in series or parallel with the third resistor R3. The positions of the third resistor R3 and the second diode D2 in fig. 4 may be interchanged.
Optionally, the amplitude of the reference signal output by the signal output end is smaller than the amplitude of the CP signal when it is normal, the voltage division ratio of the second resistor module on the third voltage division circuit is smaller than the voltage division ratio of the third resistor module on the first voltage division circuit, the voltage division ratio of the third resistor module on the first voltage division circuit is smaller than the voltage division ratio of the third resistor module on the second voltage division circuit, and the detecting chip determines whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detecting end, including:
Under the condition that the amplitude of the partial pressure signal is larger than a first threshold value, determining that the CP signal is normal;
and determining that the CP signal is abnormal under the condition that the amplitude of the partial pressure signal is smaller than the first threshold value.
In the embodiment of the application, the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio (the voltage division ratio of the third resistance module on the first voltage division circuit) is not equal to the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio (the voltage division ratio of the third resistance module on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio (the voltage division ratio of the second resistor module on the third voltage division circuit) is not equal to the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio (the voltage division ratio of the third resistor module on the second voltage division circuit), the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio (the voltage division ratio of the third resistor module on the first voltage division circuit) is not equal to the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio (the voltage division ratio of the second resistor module on the third voltage division circuit), so that the amplitudes of the voltage division signals detected by the signal detection end are different when the CP signal is normal, when the CP signal is open and when the CP signal is short-circuited, the detection chip can determine whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detection end, and can detect the abnormality of the CP signal in time.
Further, in the embodiment of the present application, the amplitude of the reference signal output by the signal output end may be set to be smaller than the amplitude of the CP signal when the CP signal is normal, the voltage division ratio of the second resistor module on the third voltage division circuit is smaller than the voltage division ratio of the third resistor module on the first voltage division circuit, and the voltage division ratio of the third resistor module on the first voltage division circuit is smaller than the voltage division ratio of the third resistor module on the second voltage division circuit. The amplitude of the partial pressure signal detected by the signal detection end when the CP signal is normal is larger than the amplitude of the partial pressure signal detected by the signal detection end when the CP signal is open circuit is larger than the amplitude of the partial pressure signal detected by the signal detection end when the CP signal is short circuit.
The first threshold may be preset and stored in the memory of the first detection chip. Because the amplitudes of the partial pressure signals detected by the signal detection end when the CP signal is short-circuited and open-circuited are smaller than the amplitudes of the partial pressure signals detected by the signal detection end when the CP signal is normal, the embodiment of the application can set the first threshold value, so that whether the CP signal is abnormal can be accurately distinguished through the first threshold value.
And determining that the CP signal is abnormal in the case that the amplitude of the divided signal is smaller than the first threshold value, including:
Determining that the CP signal is an open circuit signal when the magnitude of the divided signal is less than the first threshold value and the magnitude of the divided signal falls within a first voltage interval;
determining that the CP signal is a short-circuit signal when the amplitude of the divided signal is less than the first threshold value and the amplitude of the divided signal falls within a second voltage interval; the upper limit value of the first voltage interval is smaller than or equal to the first threshold value, the lower limit value of the first voltage interval is larger than or equal to the upper limit value of the second voltage interval, and the lower limit value of the second voltage interval is larger than or equal to 0.
In the embodiment of the application, the first voltage interval and the second voltage interval do not coincide. The first voltage interval and the second voltage interval can be preset and stored in a memory of the detection chip.
For example, if the amplitude of the reference signal output by the signal output end is 5V, the amplitude of the cp signal is 9V when it is normal, the ratio of the first resistor R1 to the third resistor R3 is greater than 2:1 and less than 15:1, the ratio of the third resistor R3 to the second resistor R2 is greater than 1:3, and the ratio of the first resistor R1 to the second resistor R2 is greater than the ratio of the first resistor R1 to the third resistor R3. The first threshold may be set to 1.7V,0.25 V.ltoreq.first voltage interval < 1.7V,0 < second voltage interval < 0.25V.
When the amplitude of the partial pressure signal detected by the signal detection end is less than 0.25V, the CP signal can be considered as a short circuit to the ground; when the amplitude of the partial pressure signal detected by the signal detection end is less than or equal to 0.25V and less than 1.7V, the CP signal can be considered as open circuit; when the amplitude of the partial pressure signal detected by the signal detection end is more than or equal to 1.7V, the CP signal can be considered normal.
The operation of the signal detection circuit is described below with reference to fig. 4.
When the CP signal is normal (the charging gun is inserted), the 9V square wave or direct current level of the CP signal is divided by R2, D2 and R3, voltage A is generated at the signal detection end of the detection chip, the detection chip detects that the voltage A is larger than a first threshold value, and the voltage A is sent to the DSP of the charger for detection, and the CP signal is identified as normal.
When the CP signal is open (the charging gun is pulled out), because the CP signal line is pulled out, no CP signal is generated, and the direct current level or PWM square wave sent by the detecting chip passes through R1, D2, and R3, and a voltage B is generated at the signal detecting end of the detecting chip, and the detecting chip detects that the voltage B falls into the first voltage interval, and recognizes that the CP signal is open.
When the CP signal is in short circuit to the ground, the point of the CP signal is the ground, the direct current level or PWM square wave sent by the detection chip passes through R1, D1 and R2 to the ground, voltage C is generated at the signal detection end of the detection chip, the detection chip detects that the voltage C falls into a second voltage interval, and the detection chip recognizes that the CP signal is in short circuit to the ground. Through above three different states, the detecting end of detecting the chip detects A, B, C three different voltages, can discern different CP states, can in time report to whole car, do next step processing, can improve the experience of charging.
Referring to fig. 5, fig. 5 is a schematic diagram of a signal detection circuit according to another embodiment of the application. As shown in fig. 5, the signal detection circuit 100 includes a first detection chip 10, a second detection chip 50, a first resistance module 20, a second resistance module 30, and a third resistance module 40, where a signal output terminal 11 of the first detection chip 10 is connected to a first terminal of the first resistance module 20, a second terminal of the first resistance module 20 is connected to a first terminal of the second resistance module 30, a first terminal of the third resistance module 40, and a signal detection terminal 51 of the second detection chip 50, a CP signal is input to a second terminal of the second resistance module 30, and a second terminal of the third resistance module 40 is grounded;
when the CP signal is open, the first resistor module 20 and the third resistor module 40 are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module 30 and the third resistor module 40 are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module 20 and the second resistor module 30 form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output end 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit), the product of the amplitude of the CP signal when normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit), and the product of the amplitude of the reference signal output by the signal output end 11 and the third voltage division ratio (the voltage division ratio of the third resistor module 40 on the third voltage division circuit) are different from each other;
The second detecting chip 50 is configured to determine whether the CP signal is abnormal according to the amplitude of the divided signal detected by the signal detecting terminal 51.
In the signal detection circuit 100 of the embodiment of the present application, when the CP signal is normal, the amplitude of the divided voltage signal detected by the signal detection terminal 51 is the divided voltage of the CP signal on the second voltage division circuit; when the CP signal is open, the amplitude of the divided voltage signal detected by the signal detecting end 51 is the divided voltage of the reference signal output by the signal output end 11 on the first voltage dividing circuit; when the CP signal is short-circuited, the magnitude of the divided voltage signal detected by the signal detecting terminal 51 is the divided voltage of the reference signal output by the signal output terminal 11 on the third divided voltage circuit. Since the product of the amplitude of the reference signal output by the signal output terminal 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit) is not equal to the product of the amplitude of the CP signal when it is normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output terminal 11 and the third voltage division ratio (the voltage division ratio of the second resistor module 30 on the third voltage division circuit) is not equal to the product of the amplitude of the CP signal when it is normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output end 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit) is not equal to the product of the amplitude of the reference signal output by the signal output end 11 and the third voltage division ratio (the voltage division ratio of the second resistor module 30 on the third voltage division circuit), so that the amplitudes of the voltage division signals detected by the signal detection end 51 are different when the CP signals are normal, open and short circuit, and the detection chip can determine whether the CP signals are abnormal according to the amplitudes of the voltage division signals detected by the signal detection end 51, so that the CP signal abnormality can be detected in time.
Optionally, the second detecting chip 50 is configured to notify the vehicle control system through the CAN bus in the case that the CP signal is abnormal. Referring to fig. 6, fig. 6 is a schematic diagram of a signal detection circuit according to another embodiment of the application. As shown in fig. 6, the second detection chip 50 may be connected to the vehicle control system 200 through a controller area network (controller area network, CAN) bus. Because the signal detection circuit 100 is directly connected to the vehicle control system 200 through the CAN bus, when the signal detection circuit 100 detects that the CP line falls off (CP signal is open) or is short-circuited to ground (CP signal is short), the second detection chip 50 CAN directly feed back to the vehicle control system 200 (i.e., the whole vehicle) through the CAN bus, and the whole vehicle CAN receive the problem feedback about the CP signal at the first time. When the whole vehicle detects that the CP signal is abnormal, the whole vehicle can inform a driver to plug the charging gun again or replace charging equipment (such as a charging pile) so as to avoid charging failure.
Referring to fig. 7, fig. 7 is a schematic diagram of a specific structure of another signal detection circuit according to an embodiment of the application.
As shown in fig. 7, the first resistor module 20 includes a first resistor R1 and a first diode D1; the first end of the first resistor R1 is connected to the first end of the first resistor module 20, the second end of the first resistor R1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the second end of the first resistor module 20. The first resistor module 20 in fig. 7 may further include at least one other resistor connected in series or parallel with the first resistor R1. The positions of the first resistor R1 and the first diode D1 in fig. 7 may be interchanged.
As shown in fig. 7, the second resistor module 30 includes a second resistor R2, a first end of the second resistor R2 is connected to the first end of the second resistor module 30, and a second end of the second resistor R2 is connected to the second end of the second resistor module 30. The second resistor module 30 in fig. 7 may further include at least one other resistor connected in series or parallel with the second resistor R2.
As shown in fig. 7, the third resistor module 40 includes a third resistor R3 and a second diode D2, wherein an anode of the second diode D2 is connected to the first end of the third resistor module 40, a cathode of the second diode D2 is connected to the first end of the third resistor R3, and a second end of the third resistor R3 is connected to the second end of the third resistor module 40. The third resistor module 40 in fig. 7 may further include at least one other resistor connected in series or parallel with the third resistor R3. The positions of the third resistor R3 and the second diode D2 in fig. 7 may be interchanged.
Optionally, the amplitude of the reference signal output by the signal output end 11 is smaller than the amplitude of the CP signal when the CP signal is normal, the voltage division ratio of the second resistor module 30 on the third voltage division circuit is smaller than the voltage division ratio of the third resistor module 40 on the first voltage division circuit, the voltage division ratio of the third resistor module 40 on the first voltage division circuit is smaller than the voltage division ratio of the third resistor module 40 on the second voltage division circuit, and the determining, by the second detecting chip 50, whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detecting end 51 includes:
In the case that the amplitude of the divided signal is greater than the first threshold, the second detection chip 50 determines that the CP signal is normal;
in the case where the amplitude of the divided voltage signal is smaller than the first threshold value, the second detection chip 50 determines that the CP signal is abnormal.
Optionally, the determining, by the second detection chip 50, that the CP signal is abnormal in the case that the amplitude of the divided signal is smaller than the first threshold includes:
in the case that the amplitude of the divided signal is smaller than the first threshold value and the amplitude of the divided signal falls within a first voltage interval, the second detection chip 50 determines that the CP signal is an open circuit signal;
in the case that the amplitude of the divided signal is smaller than the first threshold value and the amplitude of the divided signal falls within a second voltage interval, the second detection chip 50 determines that the CP signal is a short-circuit signal; the upper limit value of the first voltage interval is smaller than or equal to the first threshold value, the lower limit value of the first voltage interval is larger than or equal to the upper limit value of the second voltage interval, and the lower limit value of the second voltage interval is larger than or equal to 0.
The principle of the signal detection circuit of fig. 5 to 7 can be seen from the above description of fig. 1 to 4, and will not be repeated here.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a vehicle-mounted charger according to an embodiment of the present application. As shown in fig. 8, the vehicle-mounted charger 300 includes the signal detection circuit shown in fig. 1.
Optionally, the vehicle-mounted charger 300 includes a signal detection circuit shown in any of fig. 3 to 7.
The embodiment of the application designs a vehicle-mounted charger comprising a signal detection circuit, when a CP signal is normal, the amplitude of a partial pressure signal detected by a signal detection end 51 is the partial pressure of the CP signal on the second partial pressure circuit; when the CP signal is open, the amplitude of the divided voltage signal detected by the signal detecting end 51 is the divided voltage of the reference signal output by the signal output end 11 on the first voltage dividing circuit; when the CP signal is short-circuited, the magnitude of the divided voltage signal detected by the signal detecting terminal 51 is the divided voltage of the reference signal output by the signal output terminal 11 on the third divided voltage circuit. Since the product of the amplitude of the reference signal output by the signal output terminal 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit) is not equal to the product of the amplitude of the CP signal when it is normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output terminal 11 and the third voltage division ratio (the voltage division ratio of the second resistor module 30 on the third voltage division circuit) is not equal to the product of the amplitude of the CP signal when it is normal and the second voltage division ratio (the voltage division ratio of the third resistor module 40 on the second voltage division circuit); the product of the amplitude of the reference signal output by the signal output end 11 and the first voltage division ratio (the voltage division ratio of the third resistor module 40 on the first voltage division circuit) is not equal to the product of the amplitude of the reference signal output by the signal output end 11 and the third voltage division ratio (the voltage division ratio of the second resistor module 30 on the third voltage division circuit), so that the amplitudes of the voltage division signals detected by the signal detection end 51 are different when the CP signals are normal, open and short circuit, and the detection chip can determine whether the CP signals are abnormal according to the amplitudes of the voltage division signals detected by the signal detection end 51, so that the CP signal abnormality can be detected in time.
The signal detection circuit is arranged on the vehicle-mounted charger, and because the vehicle-mounted charger is communicated with the vehicle control system through the CAN bus, when the signal detection circuit detects that the CP signal is abnormal, the signal detection circuit CAN timely inform the vehicle control system, and the vehicle control system CAN timely inform a driver to plug the charging gun again or replace charging equipment (such as a charging pile) so as to avoid charging failure.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed signal detection circuit and the vehicle-mounted charger may be implemented in other manners. For example, the signal detection circuit embodiments described above are merely illustrative, such as the division of the units, merely a logical functional division, and there may be additional divisions in actual implementation, such as multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed.
Claims (10)
1. The signal detection circuit is characterized by comprising a detection chip, a first resistor module, a second resistor module and a third resistor module, wherein the signal output end of the detection chip is connected with the first end of the first resistor module, the second end of the first resistor module is connected with the first end of the second resistor module, the first end of the third resistor module and the signal detection end of the detection chip, the second end of the second resistor module inputs a control guidance function CP signal, and the second end of the third resistor module is grounded;
When the CP signal is open, the first resistor module and the third resistor module are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module and the third resistor module are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module and the second resistor module form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio, the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio, and the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio are not equal to each other, wherein the first voltage division ratio is the voltage division ratio of the third resistor module on the first voltage division circuit, the second voltage division ratio is the voltage division ratio of the third resistor module on the second voltage division circuit, and the third voltage division ratio is the voltage division ratio of the second resistor module on the third voltage division circuit;
and the detection chip is used for determining whether the CP signal is abnormal or not according to the amplitude of the partial pressure signal detected by the signal detection end.
2. The signal detection circuit of claim 1, wherein,
The detection chip is also used for notifying a vehicle control system through the CAN bus under the condition that the CP signal is abnormal.
3. The signal detection circuit of claim 1, wherein the first resistor module comprises a first resistor and a first diode; the first end of the first resistor is connected with the first end of the first resistor module, the second end of the first resistor is connected with the positive electrode of the first diode, and the negative electrode of the first diode is connected with the second end of the first resistor module.
4. The signal detection circuit of claim 1, wherein the second resistor module comprises a second resistor, a first end of the second resistor being connected to the first end of the second resistor module, and a second end of the second resistor being connected to the second end of the second resistor module.
5. The signal detection circuit of claim 1, wherein the third resistor module comprises a third resistor and a second diode, wherein an anode of the second diode is connected to the first end of the third resistor module, a cathode of the second diode is connected to the first end of the third resistor, and a second end of the third resistor is connected to the second end of the third resistor module.
6. The signal detection circuit according to any one of claims 1 to 5, wherein the amplitude of the reference signal output by the signal output terminal is smaller than the amplitude of the CP signal when it is normal, the voltage division ratio of the second resistor module on the third voltage division circuit is smaller than the voltage division ratio of the third resistor module on the first voltage division circuit, the voltage division ratio of the third resistor module on the first voltage division circuit is smaller than the voltage division ratio of the third resistor module on the second voltage division circuit, and the detection chip determines whether the CP signal is abnormal according to the amplitude of the voltage division signal detected by the signal detection terminal, including:
under the condition that the amplitude of the partial pressure signal is larger than a first threshold value, determining that the CP signal is normal;
and determining that the CP signal is abnormal under the condition that the amplitude of the partial pressure signal is smaller than the first threshold value.
7. The signal detection circuit of claim 6, wherein the determining that the CP signal is abnormal in the case where the magnitude of the divided signal is less than the first threshold value comprises:
determining that the CP signal is an open circuit signal when the magnitude of the divided signal is less than the first threshold value and the magnitude of the divided signal falls within a first voltage interval;
Determining that the CP signal is a short-circuit signal when the amplitude of the divided signal is less than the first threshold value and the amplitude of the divided signal falls within a second voltage interval; the upper limit value of the first voltage interval is smaller than or equal to the first threshold value, the lower limit value of the first voltage interval is larger than or equal to the upper limit value of the second voltage interval, and the lower limit value of the second voltage interval is larger than or equal to 0.
8. The signal detection circuit is characterized by comprising a first detection chip, a second detection chip, a first resistance module, a second resistance module and a third resistance module, wherein the signal output end of the first detection chip is connected with the first end of the first resistance module, the second end of the first resistance module is connected with the first end of the second resistance module, the first end of the third resistance module and the signal detection end of the second detection chip, the second end of the second resistance module inputs CP signals, and the second end of the third resistance module is grounded;
when the CP signal is open, the first resistor module and the third resistor module are connected in series to form a first voltage dividing circuit; when the CP signal is normal, the second resistor module and the third resistor module are connected in series to form a second voltage dividing circuit; when the CP signal is short-circuited, the first resistor module and the second resistor module form a third voltage dividing circuit; the product of the amplitude of the reference signal output by the signal output end and the first voltage division ratio, the product of the amplitude of the CP signal when the CP signal is normal and the second voltage division ratio, and the product of the amplitude of the reference signal output by the signal output end and the third voltage division ratio are not equal to each other, wherein the first voltage division ratio is the voltage division ratio of the third resistor module on the first voltage division circuit, the second voltage division ratio is the voltage division ratio of the third resistor module on the second voltage division circuit, and the third voltage division ratio is the voltage division ratio of the second resistor module on the third voltage division circuit; the second detection chip is used for determining whether the CP signal is abnormal or not according to the amplitude of the partial pressure signal detected by the signal detection end.
9. The signal detection circuit of claim 8, wherein,
the second detection chip is used for notifying a vehicle control system through a CAN bus under the condition that the CP signal is abnormal.
10. A vehicle-mounted charger comprising the signal detection circuit according to any one of claims 1 to 9.
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