CN110261794A - A kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit - Google Patents
A kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit Download PDFInfo
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- CN110261794A CN110261794A CN201910683733.2A CN201910683733A CN110261794A CN 110261794 A CN110261794 A CN 110261794A CN 201910683733 A CN201910683733 A CN 201910683733A CN 110261794 A CN110261794 A CN 110261794A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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Abstract
The invention discloses a kind of CP signal deteching circuits and onboard charger with detection of negative pressure circuit, the circuit include: detection of negative pressure circuit for handling CP signal and for according to the signal after detection of negative pressure processing of circuit judge power supply unit whether the single-chip microcontroller of failure, detection of negative pressure circuit specifically includes: first resistor, second resistance, first capacitor；The first end of first resistor and the CP signal receiving end of onboard charger connect, the first AD detection function pin connection of the first end, the first end of first capacitor and single-chip microcontroller of the second end and second resistance of first resistor, the second end of second resistance is connect with the first power supply, the second end ground connection of first capacitor.Since detection of negative pressure circuit can be handled -12V the level signal in CP signal, and single-chip microcontroller judge on this basis power supply unit whether failure, so can overcome the problems, such as detect power supply unit fault message in the prior art.
Description
Technical field
The present invention relates to electric vehicle charging equipment technical field, more particularly to a kind of with detection of negative pressure circuit
CP signal deteching circuit and onboard charger.
Background technique
With the development of science and technology, electric vehicle is more and more closed in industrial production and daily life
Note, especially needs to be equipped with the pure electric vehicle or plug-in hybrid electric vehicle of power battery.
The power battery of these electric vehicles needs to complete by onboard charger to charge, and according to national regulations, vehicle
Carry CC signal and CP signal that charger needs to receive power supply unit sending.Fig. 1, which connect for power supply unit with onboard charger, to be shown
It is intended to, as shown in Figure 1, CP signal is to show different charging handshake in different moments ,+12V level letter can be divided into
Number, the pwm signal of the pwm signal of ﹣ 12V level signal, ± 9V and ± 6V.As shown in Figure 1, first against the+12V electricity of CP signal
Ordinary mail number is detected to determine whether onboard charger connect with power supply unit, if onboard charger and power supply unit connect
It connects, next, then being detected to the pwm signal of CP signal to judge that power supply unit has fault-free, if power supply unit is without reason
Hinder and power supply interface is fully connected with onboard charger, controls analog switch S2 closure as shown in Figure 1 at this time, make vehicle-mounted fill
Electric system and power supply unit are in normal operating conditions, finally, also to monitor pwm signal duty in real time during charging
Than state, stops charging in 3 seconds if pwm signal is abnormal and disconnect analog switch S2.Therefore, CP signal deteching circuit
Reliability will determine the safety of whole system.
There is no -12V the level signal for CP signal to be detected in the CP detection circuit of the prior art, cannot detect
The fault message of power supply unit.
Summary of the invention
The object of the present invention is to provide a kind of CP signal deteching circuits and onboard charger with detection of negative pressure circuit, with reality
Now detection power supply unit whether failure and real time monitoring pwm signal purpose.
To achieve the goals above, the present invention provides a kind of CP signal deteching circuit with detection of negative pressure circuit, comprising: uses
In the detection of negative pressure circuit of processing CP signal and for judging power supply unit according to the signal after the detection of negative pressure processing of circuit
Whether the single-chip microcontroller of failure, the detection of negative pressure circuit specifically includes: first resistor, second resistance, first capacitor；
The first end of the first resistor and the CP signal receiving end of onboard charger connect, and the second of the first resistor
End and the first end of the second resistance, the first AD detection function pin of the first end of the first capacitor and the single-chip microcontroller
Connection, the second end of the second resistance are connect with the first power supply, the second end ground connection of the first capacitor.
Preferably, further includes: absorb filter circuit for absorbing the wink generated when the CP signal connects or disconnects
When pulse and/or noise signal, the absorption filter circuit specifically include: TVS pipe, the second capacitor and inductance；
The first end of the first end of the TVS pipe, the first end of second capacitor and the inductance and the CP signal
Receiving end connection, the second end of the second end of the TVS pipe and second capacitor are grounded respectively, the second end of the inductance with
The first end of the first resistor connects.
Preferably, further includes: first diode is with the CP signal for non-negative pressure state to be isolated；
The cathode of the first diode is connect with the second end of the inductance, the anode of the first diode with it is described
The first end of first resistor connects.
Preferably, further includes: zener diode；
The anode of the zener diode is connect with the anode of the first diode, the cathode of the zener diode with
The first end of the first resistor connects.
Preferably, further includes: positive pressure detection circuit be used for detect the onboard charger charging interface whether with it is described
The charging jack of power supply unit connects, and the positive pressure detection circuit specifically includes: the second diode, 3rd resistor, the 4th resistance
With third capacitor；
The anode of second diode is connect with the second end of the inductance, the cathode of second diode with it is described
The first end of 3rd resistor connects, the first end of the second end of the 3rd resistor and the 4th resistance, the third capacitor
First end connected with the 2nd AD detection function pin of the single-chip microcontroller, the second end of the 4th resistance and the third electricity
The second end of appearance is grounded respectively.
Preferably, further includes: national standard resistance value detection circuit and circuit for providing voltage；Wherein, the national standard resistance
Whether the pull down resistor that value detection circuit is used to detect the charging jack meets national standard resistance value, the circuit for providing voltage
For providing detection voltage for the national standard resistance value detection circuit；
The circuit for providing voltage specifically includes: the first triode, the second triode, the 5th resistance, third diode and
Second source；
The base stage of first triode is connect with the first control signal output end of the single-chip microcontroller, the one or three pole
The emitter of pipe is grounded, and the collector of first triode is connect with the base stage of second triode, the two or three pole
The emitter of pipe is connect with the second source, and the first end of the collector of second triode and the 5th resistance connects
Connect, the second end of the 5th resistance is connect with the anode of the third diode, the cathode of the third diode with it is described
The second end of inductance connects；
The national standard resistance value detection circuit specifically includes: third transistor, the 6th resistance, the 7th resistance, the 4th electricity
Hold；
The base stage of the third transistor is connect with the second control signal output end of the single-chip microcontroller, the three or three pole
The emitter of pipe is grounded, and the collector of the third transistor is connect with the first end of the 6th resistance, the 6th resistance
Second end and the first end of the 3rd resistor, the first end of the 7th resistance, the first end of the 4th capacitor and institute
The cathode connection of the second diode is stated, the second end of the 7th resistance and the second end of the 4th capacitor are grounded respectively.
Preferably, further includes: switching circuit is to be used for analog switch function, and the switching circuit specifically includes: the four or three
Pole pipe, the 8th resistance；
The base stage of 4th triode is connect with the third control signal output of the single-chip microcontroller, the four or three pole
The emitter of pipe is grounded, and the collector of the 4th triode is connect with the first end of the 8th resistance, the 8th resistance
Second end connect with the cathode of the first end of the 3rd resistor and second diode.
Preferably, further includes: pwm signal detection circuit is for determining whether are the onboard charger and the power supply unit
It is fully connected and is specifically included with pwm signal duty ratio state, the pwm signal detection circuit: the 5th capacitor, the 9th resistance,
Ten resistance, eleventh resistor, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third power supply；
The pwm signal capture pin of the first end of 5th capacitor and the first end of the 9th resistance and the single-chip microcontroller connects
It connects, the second end of the 5th capacitor ground connection, the second end of the 9th resistance and the drain electrode of first metal-oxide-semiconductor and described the
The drain electrode of two metal-oxide-semiconductors connects, the source electrode ground connection of second metal-oxide-semiconductor, the source electrode of first metal-oxide-semiconductor and the tenth resistance
First end connection, the second end of the tenth resistance connect with the third power supply, the grid of first metal-oxide-semiconductor and described the
The grid of two metal-oxide-semiconductors is connect with the first end of the eleventh resistor, the second end of the eleventh resistor and third electricity
The first end of resistance is connected with the cathode of second diode.
To achieve the above object, the present invention also provides a kind of onboard charger, including onboard charger ontology, further include on
State the CP signal deteching circuit with detection of negative pressure circuit.
A kind of CP signal deteching circuit with detection of negative pressure circuit provided by the present invention, comprising: detection of negative pressure circuit and
Single-chip microcontroller, detection of negative pressure circuit specifically include: first resistor, second resistance, first capacitor, the first power supply；Specific connection type
It is connected for the CP signal receiving end of onboard charger and the first end of first resistor, the second end of first resistor and second resistance
First end, the first end of first capacitor are connected with the first AD detection function pin of single-chip microcontroller, the second end of second resistance and the
The connection of one power supply, the second end ground connection of first capacitor.Wherein, CP signal receiving end is for receiving CP signal, detection of negative pressure circuit
For handling -12V the level signal in CP signal, single-chip microcontroller for judge power supply unit whether failure, judgment basis is negative pressure
Detection circuit treated CP signal.Since detection of negative pressure circuit can be handled -12V the level signal in CP signal,
And single-chip microcontroller judge on this basis power supply unit whether failure, so can overcome cannot detect in the prior art power supply set
The problem of standby fault message.
A kind of onboard charger provided by the present invention includes the CP signal deteching circuit with detection of negative pressure circuit, because
This, equally has above-mentioned beneficial effect.
Detailed description of the invention
In order to illustrate the embodiments of the present invention more clearly, attached drawing needed in the embodiment will be done simply below
It introduces, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ordinary skill people
For member, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is power supply unit and onboard charger connection schematic diagram；
Fig. 2 is a kind of CP signal deteching circuit structure chart with detection of negative pressure circuit provided in an embodiment of the present invention；
Fig. 3 is a kind of CP signal deteching circuit figure with detection of negative pressure circuit provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are without making creative work, obtained every other
Embodiment belongs to the scope of the present invention.
Core of the invention is to provide a kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit, with reality
Now detection power supply unit whether the purpose of failure and real-time monitoring pwm signal.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Fig. 2 is a kind of CP signal deteching circuit structure chart with detection of negative pressure circuit provided in an embodiment of the present invention, and Fig. 3 is
A kind of CP signal deteching circuit figure with detection of negative pressure circuit provided in an embodiment of the present invention.As shown in Fig. 2, with detection of negative pressure electricity
The CP signal deteching circuit on road, comprising: for handling the detection of negative pressure circuit 10 of CP signal and for according to detection of negative pressure circuit
10 treated signal judges power supply units whether the single-chip microcontroller 100 of failure, detection of negative pressure circuit 10 specifically includes as shown in Figure 3
: first resistor R1, second resistance R2, first capacitor C1；
The CP signal receiving end of the first end of first resistor R1 and onboard charger connects, the second end of first resistor R1 with
First end, the first end of first capacitor C1 of second resistance R2 is connected with the first AD detection function pin A of single-chip microcontroller, the second electricity
The second end of resistance R2 is connect with the first power supply 5V power supply, the second end ground connection of first capacitor C1.
It should be noted that according to the rules, onboard charger needs to receive the CP signal of power supply unit sending.CP signal exists
Difference is showed at the time of different, before whether confirmation onboard charger connect with power supply unit, CP signal shows as+12V level
Signal；Confirmation onboard charger is connect with power supply unit, onboard charger self-test fault-free and when battery is in chargeable state,
CP signal shows as pwm signal；When mistake occurs for power supply unit self-test, CP signal shows as -12V level signal.It may also be noticed that
, the first power supply not only can be the 5V power supply in the present embodiment, is also possible to the power supply of other values, and the present invention does not limit
It is fixed.
As shown in Fig. 2, the state of CP signal can be switched to -12V level signal when mistake occurs for power supply unit self-test
And it is sent to the CP signal receiving end of onboard charger, -12V the level signal that CP signal receiving end receives flows through detection of negative pressure
Circuit 10, detection of negative pressure circuit 10 handle to -12V the level signal of CP signal and signal is transmitted to monolithic by treated
First AD detection function pin A of machine 100, if the first AD detection function pin A of single-chip microcontroller is received, treated powers
- 12V the level signal of equipment then illustrates that onboard charger detects the fault message of power supply unit.
In the present embodiment, the CP signal deteching circuit with detection of negative pressure circuit includes: detection of negative pressure circuit and single-chip microcontroller,
Detection of negative pressure circuit specifically includes: first resistor, second resistance, first capacitor, the first power supply；Specific connection type is vehicle-mounted fills
The first end of the CP signal receiving end of electric appliance and first resistor connects, the first end of the second end of first resistor and second resistance,
The first end of first capacitor is connected with the first AD detection function pin of single-chip microcontroller, and the second end of second resistance and the first power supply connect
It connects, the second end ground connection of first capacitor.Wherein, CP signal receiving end is for receiving CP signal, and detection of negative pressure circuit is for handling
- 12V level signal in CP signal, single-chip microcontroller for judge power supply unit whether failure, judgment basis be negative pressure detection circuit
Treated CP signal.Since detection of negative pressure circuit can be handled -12V the level signal in CP signal, and single-chip microcontroller
Judge on this basis power supply unit whether failure, so can overcome cannot detect in the prior art power supply unit whether therefore
The problem of barrier.
On the basis of the above embodiments, in another embodiment, further includes: absorption filter circuit 70 as shown in Figure 3
It is specific to absorb filter circuit 70 for absorbing the transient pulse generated when CP signal connects or disconnects and/or noise signal
It include: TVS pipe D1, the second capacitor C2 and inductance L1；
The first end of the first end of TVS pipe D1, the first end of the second capacitor C2 and inductance L1 is connect with CP signal receiving end,
The second end of TVS pipe D1 and the second end of the second capacitor C2 are grounded respectively, the second end of inductance L1 and the first of first resistor R1
End connection.
When CP signal receiving end receives CP signal, TVS pipe D1, the second capacitor C2 and inductance L1 conducting absorb CP signal
The transient pulse and/or noise signal generated when connecting or disconnecting.
Absorption filter circuit in the present embodiment can be absorbed power supply unit and when vehicle is connected and disconnected from generate it is instantaneous
Pulse and/or noise signal avoid transient pulse and/or noise signal from generating interference to the detection of negative pressure of CP detection circuit.
On the basis of the above embodiments, in another embodiment, further include first diode D2 as shown in Figure 3 with
In the CP signal that non-negative pressure state is isolated；
The cathode of first diode D2 is connect with the second end of inductance L1, the anode and first resistor R1 of first diode D2
First end connection.
Since CP signal has the different forms of expression, when CP signal is not at negative pressure state, in the present embodiment the
The CP signal for being not at negative pressure state is isolated in one diode D2, avoids generating interference to the detection of negative pressure of CP detection circuit.
It on the basis of the above embodiments, in another embodiment, further include zener diode D3 as shown in Figure 3, surely
The anode of pressure diode D3 is connect with the anode of first diode D2, the cathode of zener diode D3 and the first of first resistor R1
End connection.
Zener diode in the present embodiment plays pressure stabilization function, and the acute variation of electric current is avoided to damage associated circuit components.
On the basis of the above embodiments, in another embodiment, further include positive pressure detection circuit 20 as shown in Figure 2 with
Whether the charging interface for detecting onboard charger connect with the charging jack of power supply unit, positive pressure detection circuit 20, such as Fig. 3
It is shown to specifically include: the second diode D4,3rd resistor R3, the 4th resistance R4 and third capacitor C3；
The anode of second diode D4 is connect with the second end of inductance L1, the cathode and 3rd resistor R3 of the second diode D4
First end connection, first end, the first end and monolithic of third capacitor C3 of the second end of 3rd resistor R3 and the 4th resistance R4
2nd AD detection function pin B connection of machine, the second end of the 4th resistance R4 and the second end of third capacitor C3 are grounded respectively.
It should be noted that the second diode D4 has buffer action same with first diode D2 and working method,
Details are not described herein.As shown in Fig. 2, when onboard charger CP signal receiving end receive power supply unit sending show as+
After the CP signal of 12V level signal ,+12V level signal flows into positive pressure detection circuit 20 by CP signal receiving end, examines by positive pressure
The processing of slowdown monitoring circuit 20 reaches the 2nd AD detection function pin B of single-chip microcontroller, if at single-chip microcontroller receives that treated signal
Then illustrate the charging jack connection of the charging interface and power supply unit of onboard charger in preset section, if single-chip microcontroller receives
Treated, and signal is not at preset section then illustrates the charging interface of onboard charger and the charging jack of power supply unit
Not connected, the present embodiment is not defined preset section.
The charging that the positive pressure detection circuit of the present embodiment can detecte the charging interface and power supply unit of onboard charger is inserted
Whether mouth connects.
It on the basis of the above embodiments, in another embodiment, further include national standard resistance value detection as shown in Figure 2
Circuit 50 and circuit for providing voltage 60；Wherein, national standard resistance value detection circuit 50 is used to detect the pull down resistor of charging jack
Whether national standard resistance value is met, and circuit for providing voltage 60 is used to provide detection voltage for national standard resistance value detection circuit 50；
Circuit for providing voltage 60, specifically includes as shown in Figure 3: the first triode T1, the second triode T2, the 5th resistance
R5, third diode D5 and second source 12V power supply；
The base stage of first triode T1 and the first control signal output end F connection of single-chip microcontroller, the hair of the first triode T1
Emitter grounding, the collector of the first triode T1 are connect with the base stage of the second triode T2, the emitter of the second triode T2 with
The connection of second source 12V power supply, the collector of the second triode T2 are connect with the first end of the 5th resistance R5, the 5th resistance R5's
Second end is connect with the anode of third diode D5, and the cathode of third diode D5 is connect with the second end of inductance L1；
National standard resistance value detection circuit 50, specifically includes as shown in Figure 3: third transistor T3, the 6th resistance R6, the 7th
Resistance R7, the 4th capacitor C4；
The base stage of third transistor T3 and the second control signal output end E connection of single-chip microcontroller, the hair of third transistor T3
Emitter grounding, the collector of third transistor T3 are connect with the first end of the 6th resistance R6, the second end of the 6th resistance R6 and the
The first end of three resistance R3, the first end of the 7th resistance R7, the first end of the 4th capacitor C4 and the second diode D4 cathode connect
It connects, the second end of the 7th resistance R7 and the second end of the 4th capacitor C4 are grounded respectively.
When onboard charger is connect with power supply unit, as shown in figure 3, single-chip microcontroller keeps first control signal output end F defeated
High level, second control signal output end E export low level, the first triode T1 and the second triode T2 conducting, the second electricity out
Source 12V electric power outputting current flows through the 5th resistance R5 and third diode D5 and enters positive pressure detection circuit 20, the 7th resistance R7 and
5th resistance R5 forms partial pressure.When the charging jack of power supply unit has pull down resistor, the pull down resistor and the 7th resistance R7 are simultaneously
Connection, the voltage that the 2nd AD detection function pin B of single-chip microcontroller is received reduce, and the second control signal output end E of single-chip microcontroller is defeated
Low level out, the pull down resistor is in parallel with the 7th resistance R7, meets the national standard resistance value requirement of R22 as shown in Figure 1；Work as confession
When the charging jack of electric equipment is without pull down resistor, the voltage that the 2nd AD detection function pin B of single-chip microcontroller is received is not reduced, single
The second control signal output end E output high level of piece machine control single chip computer is to make the 6th resistance R6 and the 7th resistance R7 simultaneously
Connection, to meet the national standard resistance value requirement of R22 as shown in Figure 1.It should be noted that second source not only can be 12V
Power supply, be also possible to the power supply of other values, the present invention is without limitation.It should be noted that third diode D5 has and the
The same buffer action of one diode D2 and working method, details are not described herein.
The national standard resistance value circuit and circuit for providing voltage of the present embodiment make the drop-down of the charging jack of each power supply unit
Resistance meets national standard resistance value, analyzes convenient for CP signal detection and data.
It on the basis of the above embodiments, in another embodiment, further include switching circuit 40 as shown in Figure 2 to be used for
Analog switch function, switching circuit 40, specifically includes as shown in Figure 3: the 4th triode T4, the 8th resistance R8；
The base stage of 4th triode T4 and the third control signal output D connection of single-chip microcontroller, the hair of the 4th triode T4
The collector of emitter grounding, the 4th triode T4 is connect with the first end of the 8th resistance R8, the second end of the 8th resistance R8 and the
The first end of three resistance R3 is connected with the cathode of the second diode D4.
When onboard charger self-test fault-free and battery is in chargeable state, as shown in figure 3, single-chip microcontroller controls third control
Signal output end D processed issues signal, and the 4th triode T4 is connected, and R6 pulls down to ground, the switch S2 in simulation drawing 1.It needs
It is that onboard charger is connect with power supply unit that bright, which is the usage scenario of the switch, and onboard charger self-test is completed, and needs to close
The switch makes in the resistance R22 access circuit for meeting national standard resistance value in Fig. 1.
The switching circuit of the present embodiment is controlled by signal, is had the advantages of simple structure and easy realization.
It on the basis of the above embodiments, in another embodiment, further include pwm signal detection circuit as shown in Figure 2
30 for determining whether onboard charger and power supply unit are fully connected and pwm signal duty ratio state, pwm signal detection circuit
30, it specifically includes as shown in Figure 3: the 5th capacitor C5, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, the first MOS
Pipe T5, the second metal-oxide-semiconductor T6, third power supply 3.3V power supply；
The pwm signal of the first end of 5th capacitor C5 and the first end of the 9th resistance R9 and single-chip microcontroller captures pin C connection,
The second end of 5th capacitor C5 is grounded, the drain electrode of the second end of the 9th resistance R9 and the first metal-oxide-semiconductor T5 and the leakage of the second metal-oxide-semiconductor T6
Pole connection, the source electrode ground connection of the second metal-oxide-semiconductor T6, the source electrode of the first metal-oxide-semiconductor T5 are connect with the first end of the tenth resistance R10, and the tenth
The second end of resistance R10 is connect with third power supply 3.3V power supply, the grid of the grid of the first metal-oxide-semiconductor T5 and the second metal-oxide-semiconductor T6 with
The first end of eleventh resistor R11 connects, the second end of eleventh resistor R11 and the first end of 3rd resistor R3 and the two or two pole
The cathode of pipe D4 connects.
When CP signal is in pwm signal, as shown in figure 3, pwm signal is sent to the first metal-oxide-semiconductor T5 through eleventh resistor R11
With the second metal-oxide-semiconductor T6, wherein the first metal-oxide-semiconductor T5 is P-channel, and the second metal-oxide-semiconductor T6 is N-channel, when pwm signal is high, N ditch
The second metal-oxide-semiconductor T6 in road is connected, when pwm signal is low, the first metal-oxide-semiconductor T5 conducting of P-channel, in the first metal-oxide-semiconductor T5 and the
Two metal-oxide-semiconductor T6 common end drain electrode generate high level be 3.3V, the pwm signal of low level 0V, frequency within the set range, this
The pwm signal that square-wave signal is sent into single-chip microcontroller after the 9th resistance R9 and the 5th capacitor C5 filtering captures pin C.If single-chip microcontroller
The pwm signal pwm signal that receives of capture pin C judging that section then illustrates that switch S1 as shown in Figure 1 has been closed, power supply is set
Standby charging voltage meets the requirements.The present invention does not limit the specific voltage value of third power supply, can be in the present embodiment
3.3V voltage, may not be, and the present invention is not construed as limiting.
It should be noted that PWM detection circuit of the invention also has arousal function.If there is power supply unit reservation to fill
Electricity Functional, after power supply unit is connected with onboard charger, the CP signal that power supply unit is sent is not converted into pwm signal shape
State, also in level signal state.When subscription time arrives or long-range APP issues wake-up onboard charger system command, supply
The state that electric equipment issues wake-up signal control CP signal is switched to pwm signal state.It is understood that wake-up signal is to make
Voltage jump signal of the CP signal voltage from 0V to 9V makes voltage jump signal of the CP signal voltage from -9V to 0V, makes CP signal
Frequency variation signal of the frequency from 0 to 1KHz or make pwm signal duty ratio be more than 4% signal.
The pwm signal detection circuit of the present embodiment can determine whether switch is closed and wakes up onboard charger system.
It is understood that if the CP signal deteching circuit with detection of negative pressure circuit in above-described embodiment is as independent
Product when selling or using, can apply in onboard connector.Based on this understanding, the present invention provides a kind of vehicle-mounted
Connector, including onboard connector ontology further include the CP signal deteching circuit provided by the invention with detection of negative pressure circuit.By
In onboard charger provided by the present invention include the CP signal deteching circuit with detection of negative pressure circuit, band detection of negative pressure circuit
The embodiment of CP signal deteching circuit refer to the description of above-described embodiment, beneficial effect also with the beneficial effect of above-described embodiment
Fruit is identical, and details are not described herein.
Above to a kind of CP signal deteching circuit with detection of negative pressure circuit provided by the present invention and onboard charger into
It has gone and has been discussed in detail.Each embodiment is described in a progressive manner in specification, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts in each embodiment may refer to each other.For disclosed in embodiment
For device, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method portion
It defends oneself bright.It should be pointed out that for those skilled in the art, in the premise for not departing from the principle of the invention
Under, it can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the protection of the claims in the present invention
In range.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Claims (9)
1. a kind of CP signal deteching circuit with detection of negative pressure circuit characterized by comprising for handling the negative pressure of CP signal
Detection circuit and for according to the signal after the detection of negative pressure processing of circuit judge power supply unit whether the single-chip microcontroller of failure, institute
It states detection of negative pressure circuit to specifically include: first resistor, second resistance, first capacitor；
The CP signal receiving end of the first end of the first resistor and onboard charger connects, the second end of the first resistor with
First AD detection function pin of the first end of the second resistance, the first end of the first capacitor and the single-chip microcontroller connects
It connects, the second end of the second resistance is connect with the first power supply, the second end ground connection of the first capacitor.
2. as described in claim 1 with the CP signal deteching circuit of detection of negative pressure circuit, which is characterized in that further include: it absorbs
Filter circuit is for absorbing the transient pulse generated when the CP signal connects or disconnects and/or noise signal, the suction
It receives filter circuit to specifically include: TVS pipe, the second capacitor and inductance；
The first end of the first end of the TVS pipe, the first end of second capacitor and the inductance and the CP signal receive
End connection, the second end of the second end of the TVS pipe and second capacitor are grounded respectively, the second end of the inductance with it is described
The first end of first resistor connects.
3. as claimed in claim 2 with the CP signal deteching circuit of detection of negative pressure circuit, further includes: first diode is to be used for
The CP signal of non-negative pressure state is isolated；
The cathode of the first diode is connect with the second end of the inductance, the anode of the first diode and described first
The first end of resistance connects.
4. as claimed in claim 3 with the CP signal deteching circuit of detection of negative pressure circuit, which is characterized in that further include: pressure stabilizing
Diode；
The anode of the zener diode is connect with the anode of the first diode, the cathode of the zener diode with it is described
The first end of first resistor connects.
5. as claimed in claim 4 with the CP signal deteching circuit of detection of negative pressure circuit, which is characterized in that further include: positive pressure
Whether the charging interface that detection circuit is used to detect the onboard charger connect with the charging jack of the power supply unit, described
Positive pressure detection circuit specifically includes: the second diode, 3rd resistor, the 4th resistance and third capacitor；
The anode of second diode is connect with the second end of the inductance, the cathode of second diode and the third
The first end of resistance connects, and the of the first end of the second end of the 3rd resistor and the 4th resistance, the third capacitor
One end is connected with the 2nd AD detection function pin of the single-chip microcontroller, the second end of the 4th resistance and the third capacitor
Second end is grounded respectively.
6. as claimed in claim 5 with the CP signal deteching circuit of detection of negative pressure circuit, which is characterized in that further include: country
Standard resistance value detection circuit and circuit for providing voltage；Wherein, the national standard resistance value detection circuit is for detecting the charging
Whether the pull down resistor of socket meets national standard resistance value, and the circuit for providing voltage is used to detect for the national standard resistance value
Circuit provides detection voltage；
The circuit for providing voltage specifically includes: the first triode, the second triode, the 5th resistance, third diode and second
Power supply；
The base stage of first triode is connect with the first control signal output end of the single-chip microcontroller, first triode
Emitter ground connection, the collector of first triode are connect with the base stage of second triode, second triode
Emitter is connect with the second source, and the collector of second triode is connect with the first end of the 5th resistance, institute
The second end for stating the 5th resistance is connect with the anode of the third diode, cathode and the inductance of the third diode
Second end connection；
The national standard resistance value detection circuit specifically includes: third transistor, the 6th resistance, the 7th resistance, the 4th capacitor；
The base stage of the third transistor is connect with the second control signal output end of the single-chip microcontroller, the third transistor
Emitter ground connection, the collector of the third transistor connect with the first end of the 6th resistance, and the of the 6th resistance
The first end of two ends and the 3rd resistor, the first end of the 7th resistance, the first end of the 4th capacitor and described the
The cathode of two diodes connects, and the second end of the 7th resistance and the second end of the 4th capacitor are grounded respectively.
7. as claimed in claim 6 with the CP signal deteching circuit of detection of negative pressure circuit, which is characterized in that further include: switch
Circuit is used for the function of analog switch, and the switching circuit specifically includes: the 4th triode, the 8th resistance；
The base stage of 4th triode is connect with the third control signal output of the single-chip microcontroller, the 4th triode
Emitter ground connection, the collector of the 4th triode connect with the first end of the 8th resistance, and the of the 8th resistance
Two ends are connect with the cathode of the first end of the 3rd resistor and second diode.
8. as claimed in claim 7 with the CP signal deteching circuit of detection of negative pressure circuit, which is characterized in that further include: PWM letter
Number detection circuit is for determining whether the onboard charger and the power supply unit are fully connected and pwm signal duty ratio shape
State, the pwm signal detection circuit specifically include: the 5th capacitor, the 9th resistance, the tenth resistance, eleventh resistor, the first MOS
Pipe, the second metal-oxide-semiconductor, third power supply；
The first end of 5th capacitor and the first end of the 9th resistance are connect with the pwm signal of single-chip microcontroller capture pin,
The second end of 5th capacitor is grounded, the second end of the 9th resistance and the drain electrode and described second of first metal-oxide-semiconductor
The drain electrode of metal-oxide-semiconductor connects, the source electrode ground connection of second metal-oxide-semiconductor, and the of the source electrode of first metal-oxide-semiconductor and the tenth resistance
One end connection, the second end of the tenth resistance are connect with the third power supply, the grid of first metal-oxide-semiconductor and described second
The grid of metal-oxide-semiconductor is connect with the first end of the eleventh resistor, the second end of the eleventh resistor and the 3rd resistor
First end connected with the cathode of second diode.
9. a kind of onboard charger, including onboard charger ontology, which is characterized in that further include claim 1-8 any one
The CP signal deteching circuit with detection of negative pressure circuit.
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| CN201910683733.2A CN110261794A (en) | 2019-07-26 | 2019-07-26 | A kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit |
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| CN201910683733.2A CN110261794A (en) | 2019-07-26 | 2019-07-26 | A kind of CP signal deteching circuit and onboard charger with detection of negative pressure circuit |
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| WO2022110817A1 (en) * | 2020-11-30 | 2022-06-02 | 长春捷翼汽车零部件有限公司 | Electrical appliance charging connection security detection device, system and method |
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