CN210487939U - CP signal detection circuit with negative voltage detection circuit and vehicle-mounted charger - Google Patents
CP signal detection circuit with negative voltage detection circuit and vehicle-mounted charger Download PDFInfo
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- CN210487939U CN210487939U CN201921197175.0U CN201921197175U CN210487939U CN 210487939 U CN210487939 U CN 210487939U CN 201921197175 U CN201921197175 U CN 201921197175U CN 210487939 U CN210487939 U CN 210487939U
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Abstract
The utility model discloses a take negative pressure detection circuitry's CP signal detection circuitry and on-vehicle charger, this circuit includes: the negative pressure detection circuit for handling the CP signal and the singlechip that is used for judging whether power supply unit breaks down according to the signal after the negative pressure detection circuit handles specifically include: the circuit comprises a first resistor, a second resistor and a first capacitor; the first end of the first resistor is connected with a CP signal receiving end of the vehicle-mounted charger, the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor and a first AD detection function pin of the single chip microcomputer, the second end of the second resistor is connected with the first power supply, and the second end of the first capacitor is grounded. The negative voltage detection circuit can process a-12V level signal in the CP signal, and the singlechip judges whether the power supply equipment has a fault according to the signal, so that the problem that the fault information of the power supply equipment cannot be detected in the prior art can be solved.
Description
Technical Field
The utility model relates to an electric vehicle battery charging outfit technical field especially relates to a take negative pressure detection circuitry's CP signal detection circuitry and on-vehicle charger.
Background
With the development of scientific technology, electric vehicles are receiving more and more attention in industrial production and daily life, especially pure electric vehicles or plug-in hybrid electric vehicles equipped with power batteries are required.
The power batteries of these electric vehicles need to be charged by an on-board charger, which needs to receive CC signals and CP signals from the power supply equipment according to national standards. Fig. 1 is a schematic diagram illustrating connection between a power supply device and an on-vehicle charger, and as shown in fig. 1, CP signals are charging handshake signals that show different behavior at different times, and can be divided into +12V level signals, -12V level signals, ± 9V PWM signals, and ± 6V PWM signals. As shown in fig. 1, firstly, the +12V level signal of the CP signal is detected to determine whether the vehicle-mounted charger is connected with the power supply device, if the vehicle-mounted charger is connected with the power supply device, then, the PWM signal of the CP signal is detected to determine whether the power supply device has no fault, if the power supply device has no fault and the power supply interface is completely connected with the vehicle-mounted charger, the analog switch S2 shown in fig. 1 is controlled to be closed, so that the vehicle-mounted charger system and the power supply device are in a normal working state, finally, the duty ratio state of the PWM signal is monitored in real time during charging, and once the PWM signal is abnormal, the charging is stopped within 3 seconds and the analog switch S2 is opened. Therefore, the reliability of the CP signal detection circuit will determine the safety of the entire system.
The CP detection circuit of the prior art does not detect a-12V level signal of a CP signal, and can not detect fault information of power supply equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a take negative pressure detection circuitry's CP signal detection circuitry and on-vehicle charger to realize detecting whether purpose of power supply unit trouble and real time monitoring PWM signal.
In order to achieve the above object, the utility model provides a take negative pressure detection circuitry's CP signal detection circuitry, include: the negative pressure detection circuit is used for processing CP signals and is used for judging whether the power supply equipment has faults according to the signals processed by the negative pressure detection circuit, and the negative pressure detection circuit specifically comprises: the circuit comprises a first resistor, a second resistor and a first capacitor;
the first end of the first resistor is connected with a CP signal receiving end of the vehicle-mounted charger, the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor and a first AD detection function pin of the single chip microcomputer, the second end of the second resistor is connected with a first power supply, and the second end of the first capacitor is grounded.
Preferably, the method further comprises the following steps: the absorption filter circuit is used for absorbing transient pulse and/or clutter signals generated when the CP signal is switched on or switched off, and the absorption filter circuit specifically comprises: the TVS tube, the second capacitor and the inductor;
the first end of the TVS tube, the first end of the second capacitor and the first end of the inductor are connected with the CP signal receiving end, the second end of the TVS tube and the second end of the second capacitor are respectively grounded, and the second end of the inductor is connected with the first end of the first resistor.
Preferably, the method further comprises the following steps: a first diode for isolating the CP signal in a non-negative pressure state;
the cathode of the first diode is connected with the second end of the inductor, and the anode of the first diode is connected with the first end of the first resistor.
Preferably, the method further comprises the following steps: a voltage regulator diode;
the anode of the voltage-stabilizing diode is connected with the anode of the first diode, and the cathode of the voltage-stabilizing diode is connected with the first end of the first resistor.
Preferably, the method further comprises the following steps: malleation detection circuitry is used for detecting on-vehicle charger the interface that charges with power supply unit's charging socket is connected, malleation detection circuitry specifically includes: the second diode, the third resistor, the fourth resistor and the third capacitor;
the positive pole of the second diode is connected with the second end of the inductor, the negative pole of the second diode is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the first end of the third capacitor and the second AD detection function pin of the single chip microcomputer, and the second end of the fourth resistor and the second end of the third capacitor are respectively grounded.
Preferably, the method further comprises the following steps: a national standard resistance value detection circuit and a voltage supply circuit; the national standard resistance value detection circuit is used for detecting whether the pull-down resistor of the charging socket meets the national standard resistance value or not, and the voltage supply circuit is used for supplying detection voltage to the national standard resistance value detection circuit;
the voltage supply circuit specifically includes: the power supply comprises a first triode, a second triode, a fifth resistor, a third diode and a second power supply;
the base electrode of the first triode is connected with the first control signal output end of the single chip microcomputer, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the base electrode of the second triode, the emitting electrode of the second triode is connected with the second power supply, the collecting electrode of the second triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the anode of the third diode, and the cathode of the third diode is connected with the second end of the inductor;
the national standard resistance value detection circuit specifically comprises: the third triode, the sixth resistor, the seventh resistor and the fourth capacitor;
the base electrode of the third triode is connected with the second control signal output end of the single chip microcomputer, the emitting electrode of the third triode is grounded, the collecting electrode of the third triode is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the first end of the third resistor, the first end of the seventh resistor, the first end of the fourth capacitor and the cathode of the second diode, and the second end of the seventh resistor and the second end of the fourth capacitor are grounded respectively.
Preferably, the method further comprises the following steps: the switching circuit is used for simulating a switching function, and specifically comprises: a fourth triode and an eighth resistor;
the base electrode of the fourth triode is connected with the third control signal output end of the single chip microcomputer, the emitting electrode of the fourth triode is grounded, the collecting electrode of the fourth triode is connected with the first end of the eighth resistor, and the second end of the eighth resistor is connected with the first end of the third resistor and the cathode of the second diode.
Preferably, the method further comprises the following steps: the PWM signal detection circuit is configured to determine whether the vehicle-mounted charger is completely connected to the power supply device and a PWM signal duty state, and the PWM signal detection circuit specifically includes: a fifth capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a first MOS transistor, a second MOS transistor and a third power supply;
the first end of the fifth capacitor and the first end of the ninth resistor are connected with the PWM signal capturing pin of the single chip microcomputer, the second end of the fifth capacitor is grounded, the second end of the ninth resistor is connected with the drain electrode of the first MOS tube and the drain electrode of the second MOS tube, the source electrode of the second MOS tube is grounded, the source electrode of the first MOS tube is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the third power supply, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with the first end of the eleventh resistor, and the second end of the eleventh resistor is connected with the first end of the third resistor and the cathode of the second diode.
In order to achieve the above object, the utility model also provides an on-vehicle charger, including the on-vehicle charger body, still include above-mentioned CP signal detection circuitry who takes negative pressure detection circuitry.
The utility model provides a take negative pressure detection circuitry's CP signal detection circuitry, include: negative pressure detection circuitry and singlechip, negative pressure detection circuitry specifically includes: the circuit comprises a first resistor, a second resistor, a first capacitor and a first power supply; the specific connection mode is that a CP signal receiving end of the vehicle-mounted charger is connected with a first end of a first resistor, a second end of the first resistor is connected with a first end of a second resistor, a first end of a first capacitor and a first AD detection function pin of the single chip microcomputer, a second end of the second resistor is connected with a first power supply, and a second end of the first capacitor is grounded. The CP signal receiving end is used for receiving CP signals, the negative pressure detection circuit is used for processing-12V level signals in the CP signals, and the single chip microcomputer is used for judging whether the power supply equipment is in fault or not and judging the CP signals processed by the negative pressure detection circuit according to the judgment basis. The negative voltage detection circuit can process a-12V level signal in the CP signal, and the singlechip judges whether the power supply equipment has a fault according to the signal, so that the problem that the fault information of the power supply equipment cannot be detected in the prior art can be solved.
The utility model provides a vehicle-mounted charger includes the CP signal detection circuitry who takes negative pressure detection circuitry, consequently, has above-mentioned beneficial effect equally.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without inventive work.
FIG. 1 is a schematic diagram of a power supply device connected to an onboard charger;
fig. 2 is a structural diagram of a CP signal detection circuit with a negative pressure detection circuit provided in an embodiment of the present invention;
fig. 3 is a circuit diagram of a CP signal detection circuit with a negative voltage detection circuit provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, the ordinary skilled in the art can obtain all other embodiments without creative work, which all belong to the protection scope of the present invention.
The core of the utility model is to provide a take negative pressure detection circuitry's CP signal detection circuitry and on-vehicle charger to whether the realization detects the purpose of whether trouble and real-time supervision PWM signal of power supply unit.
In order to make the technical field better understand the solution of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings and the detailed description.
Fig. 2 is the embodiment of the utility model provides a take negative pressure detection circuit's CP signal detection circuit structure chart, fig. 3 is the embodiment of the utility model provides a take negative pressure detection circuit's CP signal detection circuit diagram. As shown in fig. 2, the CP signal detecting circuit with a negative voltage detecting circuit includes: a negative pressure detection circuit 10 for processing the CP signal and a single chip 100 for determining whether the power supply device is faulty according to the signal processed by the negative pressure detection circuit 10, where the negative pressure detection circuit 10 specifically includes as shown in fig. 3: the circuit comprises a first resistor R1, a second resistor R2 and a first capacitor C1;
the first end of the first resistor R1 is connected with the CP signal receiving end of the vehicle-mounted charger, the second end of the first resistor R1 is connected with the first end of the second resistor R2 and the first end of the first capacitor C1 and the first AD detection function pin A of the single chip microcomputer, the second end of the second resistor R2 is connected with the 5V power supply of the first power supply, and the second end of the first capacitor C1 is grounded.
In addition, according to the regulations, the in-vehicle charger needs to receive a CP signal transmitted from the power supply device. The CP signals are different at different moments, and before the condition that whether the vehicle-mounted charger is connected with the power supply equipment is confirmed, the CP signals are +12V level signals; confirming that the vehicle-mounted charger is connected with the power supply equipment, and when the vehicle-mounted charger has no fault in self-checking and the battery is in a chargeable state, the CP signal is represented as a PWM signal; when the self-test of the power supply equipment has errors, the CP signal is represented as a-12V level signal. It should be noted that the first power supply may be not only the 5V power supply in the present embodiment, but also a power supply with other values, and the present invention is not limited thereto.
As shown in fig. 2, when the self-test of the power supply equipment has an error, the state of the CP signal is switched to a-12V level signal and the CP signal is sent to a CP signal receiving end of the vehicle-mounted charger, the-12V level signal received by the CP signal receiving end flows through the negative voltage detection circuit 10, the negative voltage detection circuit 10 processes the-12V level signal of the CP signal and transmits the processed signal to the first AD detection function pin a of the single chip microcomputer 100, and if the first AD detection function pin a of the single chip microcomputer receives the processed-12V level signal of the power supply equipment, it indicates that the vehicle-mounted charger detects the fault information of the power supply equipment.
In the present embodiment, the CP signal detection circuit with negative voltage detection circuit includes: negative pressure detection circuitry and singlechip, negative pressure detection circuitry specifically includes: the circuit comprises a first resistor, a second resistor, a first capacitor and a first power supply; the specific connection mode is that a CP signal receiving end of the vehicle-mounted charger is connected with a first end of a first resistor, a second end of the first resistor is connected with a first end of a second resistor, a first end of a first capacitor and a first AD detection function pin of the single chip microcomputer, a second end of the second resistor is connected with a first power supply, and a second end of the first capacitor is grounded. The CP signal receiving end is used for receiving CP signals, the negative pressure detection circuit is used for processing-12V level signals in the CP signals, and the single chip microcomputer is used for judging whether the power supply equipment is in fault or not and judging the CP signals processed by the negative pressure detection circuit according to the judgment basis. The negative voltage detection circuit can process a-12V level signal in the CP signal, and the singlechip judges whether the power supply equipment has faults or not according to the signal, so that the problem that whether the power supply equipment has faults or not cannot be detected in the prior art can be solved.
On the basis of the above embodiment, in another embodiment, the method further includes: as shown in fig. 3, the absorption filter circuit 70 is used for absorbing transient pulses and/or clutter signals generated when the CP signal is turned on or off, and the absorption filter circuit 70 specifically includes: a TVS tube D1, a second capacitor C2 and an inductor L1;
the first end of the TVS tube D1, the first end of the second capacitor C2, and the first end of the inductor L1 are connected to a CP signal receiving terminal, the second end of the TVS tube D1 and the second end of the second capacitor C2 are grounded, respectively, and the second end of the inductor L1 is connected to the first end of the first resistor R1.
When the CP signal receiving end receives the CP signal, the TVS tube D1, the second capacitor C2 and the inductor L1 are turned on, and transient pulses and/or noise signals generated when the CP signal is turned on or off are absorbed.
The absorption filter circuit in the embodiment can absorb transient pulses and/or clutter signals generated when the power supply equipment and the vehicle are connected and disconnected, and avoids the transient pulses and/or clutter signals from interfering with negative voltage detection of the CP detection circuit.
On the basis of the above embodiment, in another embodiment, a first diode D2 shown in fig. 3 is further included for isolating the CP signal in the non-negative pressure state;
the cathode of the first diode D2 is connected to the second terminal of the inductor L1, and the anode of the first diode D2 is connected to the first terminal of the first resistor R1.
Because the CP signals have different expressions, when the CP signals are not in the negative voltage state, the first diode D2 in this embodiment isolates the CP signals that are not in the negative voltage state, thereby avoiding interference with the negative voltage detection of the CP detection circuit.
On the basis of the above embodiment, in another embodiment, a zener diode D3 as shown in fig. 3 is further included, an anode of the zener diode D3 is connected to an anode of the first diode D2, and a cathode of the zener diode D3 is connected to the first end of the first resistor R1.
The voltage stabilizing diode in the embodiment plays a role in stabilizing voltage, and avoids that the violent change of current damages related circuit elements.
On the basis of the above embodiment, in another embodiment, a positive voltage detection circuit 20 shown in fig. 2 is further included for detecting whether a charging interface of the vehicle-mounted charger is connected to a charging socket of the power supply device, and the positive voltage detection circuit 20 specifically includes, as shown in fig. 3: a second diode D4, a third resistor R3, a fourth resistor R4 and a third capacitor C3;
the anode of the second diode D4 is connected with the second end of the inductor L1, the cathode of the second diode D4 is connected with the first end of the third resistor R3, the second end of the third resistor R3 is connected with the first end of the fourth resistor R4, the first end of the third capacitor C3 and the second AD detection function pin B of the single chip, and the second end of the fourth resistor R4 and the second end of the third capacitor C3 are respectively grounded.
It should be noted that the second diode D4 has the same isolation function and operation as the first diode D2, and will not be described herein again. As shown in fig. 2, after the CP signal receiving end of the vehicle-mounted charger receives a CP signal which is a +12V level signal and is sent by the power supply device, the +12V level signal flows into the positive voltage detection circuit 20 from the CP signal receiving end, and reaches the second AD detection function pin B of the single chip microcomputer through the processing of the positive voltage detection circuit 20, if the processed signal received by the single chip microcomputer is in a preset interval, it indicates that the charging interface of the vehicle-mounted charger is connected to the charging socket of the power supply device, and if the processed signal received by the single chip microcomputer is not in the preset interval, it indicates that the charging interface of the vehicle-mounted charger is not connected to the charging socket of the power supply device, and this embodiment does not limit the preset interval.
The positive voltage detection circuit of the embodiment can detect whether the charging interface of the vehicle-mounted charger is connected with the charging socket of the power supply equipment.
On the basis of the above embodiment, in another embodiment, the system further includes a national standard resistance value detection circuit 50 and a voltage supply circuit 60 as shown in fig. 2; the national standard resistance value detection circuit 50 is used for detecting whether the pull-down resistor of the charging jack meets the national standard resistance value, and the voltage supply circuit 60 is used for supplying detection voltage to the national standard resistance value detection circuit 50;
the voltage supply circuit 60 specifically includes, as shown in fig. 3: the power supply comprises a first triode T1, a second triode T2, a fifth resistor R5, a third diode D5 and a second power supply 12V;
the base electrode of the first triode T1 is connected with the first control signal output end F of the single chip microcomputer, the emitter electrode of the first triode T1 is grounded, the collector electrode of the first triode T1 is connected with the base electrode of the second triode T2, the emitter electrode of the second triode T2 is connected with the 12V power supply of the second power supply, the collector electrode of the second triode T2 is connected with the first end of a fifth resistor R5, the second end of the fifth resistor R5 is connected with the anode of a third diode D5, and the cathode of a third diode D5 is connected with the second end of an inductor L1;
the national standard resistance value detection circuit 50 specifically includes, as shown in fig. 3: a third triode T3, a sixth resistor R6, a seventh resistor R7 and a fourth capacitor C4;
the base electrode of the third triode T3 is connected with the second control signal output end E of the single chip microcomputer, the emitter electrode of the third triode T3 is grounded, the collector electrode of the third triode T3 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the first end of the third resistor R3, the first end of the seventh resistor R7, the first end of the fourth capacitor C4 and the cathode of the second diode D4, and the second end of the seventh resistor R7 and the second end of the fourth capacitor C4 are grounded respectively.
When the vehicle-mounted charger is connected with the power supply device, as shown in fig. 3, the single chip microcomputer enables the first control signal output end F to output a high level and the second control signal output end E to output a low level, the first triode T1 and the second triode T2 are switched on, the second power supply 12V outputs current, the current flows through the fifth resistor R5 and the third diode D5 to enter the positive voltage detection circuit 20, and the seventh resistor R7 and the fifth resistor R5 form voltage division. When a charging socket of the power supply equipment is provided with a pull-down resistor, the pull-down resistor is connected with the seventh resistor R7 in parallel, the voltage received by the second AD detection function pin B of the single chip microcomputer is reduced, the second control signal output end E of the single chip microcomputer outputs a low level, and the pull-down resistor is connected with the seventh resistor R7 in parallel, so that the national standard resistance requirement of R22 shown in figure 1 is met; when the charging socket of the power supply equipment has no pull-down resistor, the voltage received by the second AD detection function pin B of the single chip microcomputer is not reduced, and the second control signal output end E of the single chip microcomputer controls the high level output by the second AD detection function pin B of the single chip microcomputer, so that the sixth resistor R6 and the seventh resistor R7 are connected in parallel to meet the national standard resistance requirement of R22 shown in fig. 1. It should be noted that the second power supply may be not only a 12V power supply, but also a power supply of other value, and the present invention is not limited thereto. It should be noted that the third diode D5 has the same isolation function and operation as the first diode D2, and will not be described herein again.
The national standard resistance circuit and the voltage supply circuit of the embodiment enable the pull-down resistor of the charging socket of each power supply device to meet the national standard resistance, and are convenient for CP signal detection and data analysis.
On the basis of the above embodiment, in another embodiment, a switch circuit 40 shown in fig. 2 is further included for simulating the switching function, and the switch circuit 40, as shown in fig. 3, specifically includes: a fourth triode T4 and an eighth resistor R8;
the base of the fourth triode T4 is connected with the third control signal output terminal D of the single chip microcomputer, the emitter of the fourth triode T4 is grounded, the collector of the fourth triode T4 is connected with the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected with the first end of the third resistor R3 and the cathode of the second diode D4.
When the vehicle-mounted charger is self-checked to be fault-free and the battery is in a chargeable state, as shown in fig. 3, the single chip microcomputer controls the third control signal output end D to send a signal, so that the fourth triode T4 is turned on, and the R6 is pulled down to the ground, so as to simulate the switch S2 in fig. 1. It should be noted that the application scenario of the switch is that the vehicle-mounted charger is connected to the power supply device, the self-check of the vehicle-mounted charger is completed, and the switch needs to be closed to enable the resistor R22 meeting the national standard resistance value in fig. 1 to be connected into the circuit.
The switch circuit of the embodiment is controlled by signals, has a simple structure and is easy to realize.
On the basis of the above embodiment, in another embodiment, a PWM signal detection circuit 30 shown in fig. 2 is further included for determining whether the vehicle-mounted charger and the power supply device are completely connected and a PWM signal duty state, and the PWM signal detection circuit 30 specifically includes, as shown in fig. 3: a fifth capacitor C5, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a first MOS transistor T5, a second MOS transistor T6 and a third power supply 3.3V;
a first end of a fifth capacitor C5 and a first end of a ninth resistor R9 are connected to a PWM signal capture pin C of the single chip microcomputer, a second end of a fifth capacitor C5 is grounded, a second end of the ninth resistor R9 is connected to a drain of the first MOS transistor T5 and a drain of the second MOS transistor T6, a source of the second MOS transistor T6 is grounded, a source of the first MOS transistor T5 is connected to a first end of a tenth resistor R10, a second end of the tenth resistor R10 is connected to a 3.3V power supply of the third power supply, a gate of the first MOS transistor T5 and a gate of the second MOS transistor T6 are connected to a first end of an eleventh resistor R11, and a second end of the eleventh resistor R11 is connected to a first end of the third resistor R3 and a cathode of the second diode D4.
When the CP signal is the PWM signal, as shown in fig. 3, the PWM signal is sent to the first MOS transistor T5 and the second MOS transistor T6 through the eleventh resistor R11, where the first MOS transistor T5 is a P-channel, the second MOS transistor T6 is an N-channel, when the PWM signal is high, the second MOS transistor T6 of the N-channel is turned on, when the PWM signal is low, the first MOS transistor T5 of the P-channel is turned on, a PWM signal with a high level of 3.3V, a low level of 0V and a frequency within a set range is generated at the common terminal drain of the first MOS transistor T5 and the second MOS transistor T6, and the square wave signal is filtered through the ninth resistor R9 and the fifth capacitor C5 and then sent to the PWM signal capture pin C of the single chip microcomputer. If the PWM signal received by the PWM signal capture pin C of the single chip microcomputer is in the judgment interval, it indicates that the switch S1 shown in fig. 1 is closed, and the charging voltage of the power supply device meets the requirement. The utility model discloses do not do the injecing to the concrete magnitude of voltage of third power, can be the 3.3V voltage in this embodiment, also can not, the utility model discloses do not do the injecing.
It should be noted that the PWM detection circuit of the present invention further has a wake-up function. If the power supply equipment has the reserved charging function, after the power supply equipment is connected with the vehicle-mounted charger, the CP signal sent by the power supply equipment is not converted into the PWM signal state, and is still in the level signal state. When the reserved time is up or the remote APP sends an instruction for waking up the vehicle-mounted charger system, the power supply equipment sends a wake-up signal to control the state of the CP signal to be switched into a PWM signal state. It is understood that the wake-up signal is a voltage jump signal for making the CP signal voltage from 0V to 9V, a voltage jump signal for making the CP signal voltage from-9V to 0V, a frequency change signal for making the frequency of the CP signal from 0 to 1KHz or a signal for making the duty ratio of the PWM signal exceed 4%.
The PWM signal detection circuit of the present embodiment can determine whether the switch is closed and wake up the in-vehicle charger system.
It is to be understood that the CP signal detecting circuit with the negative voltage detecting circuit in the above embodiment can be applied to a vehicle connector if it is sold or used as a separate product. Based on such understanding, the utility model provides an on-vehicle connector, including the on-vehicle connector body, still include the utility model provides a take negative pressure detection circuitry's CP signal detection circuitry. Because the utility model provides an on-vehicle charger includes the CP signal detection circuit who takes negative pressure detection circuit, and the description of above-mentioned embodiment is please be referred to the CP signal detection circuit's of taking negative pressure detection circuit embodiment, and beneficial effect is also the same with the beneficial effect of above-mentioned embodiment, no longer gives unnecessary details here.
It is right above the utility model provides a take negative pressure detection circuitry's CP signal detection circuitry and on-vehicle charger introduce in detail. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (9)
1. A CP signal detection circuit with a negative voltage detection circuit is characterized by comprising: the negative pressure detection circuit is used for processing CP signals and is used for judging whether the power supply equipment has faults according to the signals processed by the negative pressure detection circuit, and the negative pressure detection circuit specifically comprises: the circuit comprises a first resistor, a second resistor and a first capacitor;
the first end of the first resistor is connected with a CP signal receiving end of the vehicle-mounted charger, the second end of the first resistor is connected with the first end of the second resistor, the first end of the first capacitor and a first AD detection function pin of the single chip microcomputer, the second end of the second resistor is connected with a first power supply, and the second end of the first capacitor is grounded.
2. The CP signal detecting circuit with a negative voltage detecting circuit according to claim 1, further comprising: the absorption filter circuit is used for absorbing transient pulse and/or clutter signals generated when the CP signal is switched on or switched off, and the absorption filter circuit specifically comprises: the TVS tube, the second capacitor and the inductor;
the first end of the TVS tube, the first end of the second capacitor and the first end of the inductor are connected with the CP signal receiving end, the second end of the TVS tube and the second end of the second capacitor are respectively grounded, and the second end of the inductor is connected with the first end of the first resistor.
3. A CP signal detecting circuit with a negative voltage detecting circuit according to claim 2, further comprising: a first diode for isolating the CP signal in a non-negative pressure state;
the cathode of the first diode is connected with the second end of the inductor, and the anode of the first diode is connected with the first end of the first resistor.
4. A CP signal detecting circuit with a negative voltage detecting circuit according to claim 3, further comprising: a voltage regulator diode;
the anode of the voltage-stabilizing diode is connected with the anode of the first diode, and the cathode of the voltage-stabilizing diode is connected with the first end of the first resistor.
5. The CP signal detecting circuit with negative voltage detecting circuit according to claim 4, further comprising: malleation detection circuitry is used for detecting on-vehicle charger the interface that charges with power supply unit's charging socket is connected, malleation detection circuitry specifically includes: the second diode, the third resistor, the fourth resistor and the third capacitor;
the positive pole of the second diode is connected with the second end of the inductor, the negative pole of the second diode is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the fourth resistor, the first end of the third capacitor and the second AD detection function pin of the single chip microcomputer, and the second end of the fourth resistor and the second end of the third capacitor are respectively grounded.
6. The CP signal detecting circuit with negative voltage detecting circuit according to claim 5, further comprising: a national standard resistance value detection circuit and a voltage supply circuit; the national standard resistance value detection circuit is used for detecting whether the pull-down resistor of the charging socket meets the national standard resistance value or not, and the voltage supply circuit is used for supplying detection voltage to the national standard resistance value detection circuit;
the voltage supply circuit specifically includes: the power supply comprises a first triode, a second triode, a fifth resistor, a third diode and a second power supply;
the base electrode of the first triode is connected with the first control signal output end of the single chip microcomputer, the emitting electrode of the first triode is grounded, the collecting electrode of the first triode is connected with the base electrode of the second triode, the emitting electrode of the second triode is connected with the second power supply, the collecting electrode of the second triode is connected with the first end of the fifth resistor, the second end of the fifth resistor is connected with the anode of the third diode, and the cathode of the third diode is connected with the second end of the inductor;
the national standard resistance value detection circuit specifically comprises: the third triode, the sixth resistor, the seventh resistor and the fourth capacitor;
the base electrode of the third triode is connected with the second control signal output end of the single chip microcomputer, the emitting electrode of the third triode is grounded, the collecting electrode of the third triode is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the first end of the third resistor, the first end of the seventh resistor, the first end of the fourth capacitor and the cathode of the second diode, and the second end of the seventh resistor and the second end of the fourth capacitor are grounded respectively.
7. The CP signal detecting circuit with negative voltage detecting circuit according to claim 6, further comprising: the switching circuit is used for simulating the function of a switch, and specifically comprises: a fourth triode and an eighth resistor;
the base electrode of the fourth triode is connected with the third control signal output end of the single chip microcomputer, the emitting electrode of the fourth triode is grounded, the collecting electrode of the fourth triode is connected with the first end of the eighth resistor, and the second end of the eighth resistor is connected with the first end of the third resistor and the cathode of the second diode.
8. The CP signal detecting circuit with negative voltage detecting circuit according to claim 7, further comprising: the PWM signal detection circuit is configured to determine whether the vehicle-mounted charger is completely connected to the power supply device and a PWM signal duty state, and the PWM signal detection circuit specifically includes: a fifth capacitor, a ninth resistor, a tenth resistor, an eleventh resistor, a first MOS transistor, a second MOS transistor and a third power supply;
the first end of the fifth capacitor and the first end of the ninth resistor are connected with the PWM signal capturing pin of the single chip microcomputer, the second end of the fifth capacitor is grounded, the second end of the ninth resistor is connected with the drain electrode of the first MOS tube and the drain electrode of the second MOS tube, the source electrode of the second MOS tube is grounded, the source electrode of the first MOS tube is connected with the first end of the tenth resistor, the second end of the tenth resistor is connected with the third power supply, the grid electrode of the first MOS tube and the grid electrode of the second MOS tube are connected with the first end of the eleventh resistor, and the second end of the eleventh resistor is connected with the first end of the third resistor and the cathode of the second diode.
9. An on-vehicle charger comprising an on-vehicle charger body, characterized by further comprising a CP signal detection circuit with a negative voltage detection circuit according to any one of claims 1 to 8.
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| CN201921197175.0U CN210487939U (en) | 2019-07-26 | 2019-07-26 | CP signal detection circuit with negative voltage detection circuit and vehicle-mounted charger |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261794A (en) * | 2019-07-26 | 2019-09-20 | 科世达(上海)机电有限公司 | A kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261794A (en) * | 2019-07-26 | 2019-09-20 | 科世达(上海)机电有限公司 | A kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit |
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