CN109342823A - Measuring circuit, control method and the electric car of Y capacitance - Google Patents
Measuring circuit, control method and the electric car of Y capacitance Download PDFInfo
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- CN109342823A CN109342823A CN201811149752.9A CN201811149752A CN109342823A CN 109342823 A CN109342823 A CN 109342823A CN 201811149752 A CN201811149752 A CN 201811149752A CN 109342823 A CN109342823 A CN 109342823A
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- voltage difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
Abstract
The present invention proposes that the measuring circuit, control method and electric car of a kind of Y capacitance, the measuring circuit include: the pulse signal source for exporting positive negative pulse stuffing signal；One end of oscillating circuit, oscillating circuit is connected with pulse signal source；Y capacitance module, Y capacitance module includes Y capacitance, one end of Y capacitance module is connected with the other end of oscillating circuit, the other end of Y capacitance module is grounded, wherein, when pulse signal source is overturn every time, the end voltage of voltage difference and Y capacitance when being overturn every time according to the capacitance of oscillating circuit, pulse signal source obtains the capacitance of Y capacitance in corresponding voltage difference of each step response moment.The present invention can rapidly and accurately measure the capacitance of Y capacitance, to be conducive to high voltage fault and security risk existing for discovery vehicle in time, improve vehicle security.
Description
Technical field
The present invention relates to electric vehicle engineering field, in particular to a kind of measuring circuit of Y capacitance, control method and electronic
Automobile.
Background technique
Y capacitance would generally be contained in high voltage component in electric car, especially in electric machine controller Y capacitance value compared with
Greatly.The presence of Y capacitance makes in the case where high pressure powers off, and the high-voltage safety of load-side is affected, the collision of electric car
In safety, the value of Y capacitance is constrained, energy storage of the Y capacitance under maximum voltage requires to be less than 0.2J, will deposit more than 0.2J
In high-voltage safety danger, has in relevant criterion and this index is distinctly claimed.
At present for the measurement of Y capacitance be all under dead ship condition, maintenance station by maintenance personal by measuring device into
Row detection.Due to Y capacitance measurement need under specific occasion by particular device completion, be usually all in Automobile Design about
The size of beam Y capacitance, to guarantee that Y capacitance energy storage is less than 0.2J.But the size of Y capacitance is in the life cycle of vehicle, by
The influences such as ambient humidity can generate certain variation.In the use process of electric car, Y capacitance, which becomes larger, influences whether collision peace
Entirely, it and when Y capacitance becomes larger and influences collision safety, can not find in time, this can collision safety band to electric car
Carry out some potential safety problems, reduces vehicle security.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, the first purpose of this invention is to propose a kind of measuring circuit of Y capacitance, can rapidly and accurately measure
The capacitance of Y capacitance out improves vehicle safety to be conducive to high voltage fault and security risk existing for discovery vehicle in time
Property.
Second object of the present invention is to propose a kind of electric car.
Third object of the present invention is to propose a kind of control method of the measuring circuit of Y capacitance.
To achieve the goals above, the embodiment of first aspect present invention proposes a kind of measuring circuit of Y capacitance, packet
It includes: for exporting the pulse signal source of positive negative pulse stuffing signal；Oscillating circuit, one end of the oscillating circuit and the pulse signal
Source is connected；Y capacitance module, the Y capacitance module includes Y capacitance, and one end of the Y capacitance module is another with the oscillating circuit
One end is connected, the other end ground connection of the Y capacitance module, wherein when the pulse signal source is overturn every time, according to the vibration
Swing the capacitance of circuit, the end voltage of the voltage difference when pulse signal source is overturn every time and the Y capacitance is in each rank
The jump response moment, corresponding voltage difference obtained the capacitance of the Y capacitance.
The measuring circuit of Y capacitance according to an embodiment of the present invention, when pulse signal source is overturn every time, according to oscillating circuit
Voltage difference and Y capacitance when overturning every time of capacitance, pulse signal source end voltage it is corresponding at each step response moment
Voltage difference obtain the capacitance of Y capacitance, so as to rapidly and accurately measure the capacitance of Y capacitance, thus be conducive to and
High voltage fault existing for Shi Faxian vehicle and security risk, improve vehicle security.
In addition, the measuring circuit of Y capacitance according to the above embodiment of the present invention can also have following additional technology special
Sign:
In some instances, the capacitance of the Y capacitance is calculate by the following formula:
Cy=C1 (△ V2- △ Vy)/△ Vy
Wherein, Cy is the capacitance of the Y capacitance, and C1 is known electric capacitance, and △ V2 is that the pulse signal source turns over every time
Voltage difference when turning, △ Vy are the end voltage of the Y capacitance in corresponding voltage difference of each step response moment.
In some instances, the oscillating circuit is First-order Rc Circuit.
To achieve the goals above, the embodiment of second aspect of the present invention proposes a kind of electric car, including such as this hair
The measuring circuit of Y capacitance described in bright above-described embodiment.
Electric car according to an embodiment of the present invention can rapidly and accurately measure the capacitance of Y capacitance, to be conducive to
High voltage fault and security risk existing for discovery vehicle in time, improve vehicle security.
To achieve the goals above, the embodiment of third aspect present invention proposes one kind such as the above embodiment of the present invention institute
The control method of the measuring circuit for the Y capacitance stated, comprising the following steps: when pulse signal source is overturn every time, obtain oscillation electricity
The end voltage of voltage difference and Y capacitance when the capacitance on road, the pulse signal source are overturn every time is in each step response
Carve corresponding voltage difference；According to the capacitance of the oscillating circuit, the pulse signal source is overturn every time when voltage difference
And the end voltage of the Y capacitance obtains the capacitance of the Y capacitance in corresponding voltage difference of each step response moment.
The control method of the measuring circuit of Y capacitance according to an embodiment of the present invention, when pulse signal source is overturn every time, root
The end voltage of voltage difference and Y capacitance when overturning every time according to the capacitance of oscillating circuit, pulse signal source is rung in each step
Moment corresponding voltage difference is answered to obtain the capacitance of Y capacitance, so as to rapidly and accurately measure the capacitance of Y capacitance,
To be conducive to high voltage fault and security risk existing for discovery vehicle in time, vehicle security is improved.
In addition, the control method of the measuring circuit of Y capacitance according to the above embodiment of the present invention can also have it is following attached
The technical characteristic added:
In some instances, the capacitance of the Y capacitance is calculate by the following formula:
Cy=C1 (△ V2- △ Vy)/△ Vy
Wherein, Cy is the capacitance of the Y capacitance, and C1 is known electric capacitance, and △ V2 is that the pulse signal source turns over every time
Voltage difference when turning, △ Vy are the end voltage of the Y capacitance in corresponding voltage difference of each step response moment.
In some instances, the voltage difference when pulse signal source is overturn every time is the positive and negative of the pulse signal source
The absolute value of pole tension difference.
In some instances, the end voltage of the Y capacitance is described in corresponding voltage difference of each step response moment
The absolute value of the corresponding end voltage difference of the pulse signal source jump front and back Y capacitance.
In some instances, further includes: judge whether the oscillating circuit is in stable state；If it is, allowing the arteries and veins
It rushes signal source to be overturn, otherwise, the pulse signal source is forbidden to overturn.
In some instances, further includes: judge whether the capacitance of the Y capacitance is greater than preset value；If it is, carrying out
Y capacitance fault alarm.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the schematic diagram of the measuring circuit of Y capacitance according to an embodiment of the invention；
Fig. 2 is the flow chart of the control method of the measuring circuit of Y capacitance according to an embodiment of the invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The measuring circuit, control method and electric car of Y capacitance according to an embodiment of the present invention are described below in conjunction with attached drawing.
Fig. 1 is the schematic diagram of the measuring circuit of Y capacitance according to an embodiment of the invention.As shown in Figure 1, the measurement is electric
Road includes: pulse signal source V2, oscillating circuit 10 and Y capacitance module 20.
Wherein, pulse signal source V2 is for exporting positive negative pulse stuffing signal.In specific example, pulse signal source V2 is for example defeated
The pulse signal of positive and negative 12V out.
One end of oscillating circuit 10 is connected with pulse signal source V2.Specifically, as shown in Figure 1, oscillating circuit 10 is single order
RC circuit, i.e., the First-order Rc Circuit being made of resistance R1 and capacitor C1 parallel connection.
Y capacitance module 20 includes Y capacitance Cy, and one end of Y capacitance module 20 is connected with the other end of oscillating circuit 10, Y electricity
The other end of molar block 20 is grounded.In addition, as shown in Figure 1, resistance Ry is system insulating resistance.
Wherein, each according to the capacitance of oscillating circuit 10, pulse signal source V2 when pulse signal source V2 is overturn every time
The end voltage of voltage difference and Y capacitance Cy when overturning obtains Y capacitance Cy in corresponding voltage difference of each step response moment
Capacitance, thus be conducive in time discovery vehicle existing for high voltage fault and security risk, improve vehicle security.For example,
After the capacitance for obtaining Y capacitance Cy, judge whether the capacitance of Y capacitance Cy is greater than preset value；If it is, carrying out Y electricity
Hold fault alarm, to remind related personnel's on-call maintenance to handle, avoids Y capacitance failure from hiding always, collision safety is caused hidden
Suffer from, improves vehicle security.
Wherein, before pulse signal source V2 is overturn every time, need to judge oscillating circuit 10 whether in stable state；If
It is that pulse signal source V2 is then allowed to be overturn, otherwise, pulse signal source V2 is forbidden to overturn.
Wherein, the positive and negative anodes voltage difference that voltage difference when pulse signal source V2 is overturn every time is pulse signal source V2
Absolute value.The end voltage of Y capacitance Cy is before and after corresponding voltage difference of each step response moment is pulse signal source V2 jump
The absolute value of the corresponding end voltage difference of Y capacitance Cy.
Specifically, the capacitance of Y capacitance Cy is calculate by the following formula:
Cy=C1 (△ V2- △ Vy)/△ Vy
Wherein, Cy is the capacitance of Y capacitance, and C1 is known electric capacitance, and △ V2 is when pulse signal source V2 is overturn every time
Voltage difference, △ Vy are the end voltage of Y capacitance Cy in corresponding voltage difference of each step response moment.
In conjunction with Fig. 1, for example, the value that pulse signal source V2, capacitor C1, resistance R1 are is it is known that insulation resistance Ry
Capacitance with Y capacitance Cy is unknown-value, and wherein pulse signal source V2 exports positive and negative 12V pulse signal.As shown in Fig. 1, this electricity
Road is First-order Rc Circuit, and according to the threefactor method of firstorder circuit step response, for the step response t0 moment, there are △ Vy=Vy
(t0+)-Vy (t0-)=C1/ (C1+Cy) * △ V2；Based on this, then Cy=C1 (△ V2- △ Vy)/△ Vy.Specifically, each parameter
Value is for example are as follows: R1=1M, C1=100nF, Ry=100k, Cy=0.5uF.
Pulse signal source V2 is overturn every time, is all the t0 moment of firstorder circuit, collection voltages are distinguished before and after jump
Signal Vy (0-) and Vy (0+), for positive transition, △ V2 is 24V, and for negative jump, △ V2 is 24V.Y capacitance can be calculated
The capacitance of CY.
It should be noted that foregoing circuit has certain requirement to the overturning period of pulse signal source V2, with single-chip microcontroller mould
It when quasi- pulse signal source V2 output, needs to be overturn next time after firstorder circuit reaches stable state, i.e., periodically acquisition Vy
Value acquires Vy value as Vy (0-) after Vy stablizes, and controls pulse overturning.
The measuring circuit of Y capacitance according to an embodiment of the present invention, when pulse signal source is overturn every time, according to oscillating circuit
Voltage difference and Y capacitance when overturning every time of capacitance, pulse signal source end voltage it is corresponding at each step response moment
Voltage difference obtain the capacitance of Y capacitance, so as to rapidly and accurately measure the capacitance of Y capacitance, thus be conducive to and
High voltage fault existing for Shi Faxian vehicle and security risk, improve vehicle security.
Further embodiment of the present invention also proposed a kind of electric car.The electric car includes that the present invention is above-mentioned any
The measuring circuit of Y capacitance described in one embodiment.
Electric car according to an embodiment of the present invention can rapidly and accurately measure the capacitance of Y capacitance, to be conducive to
High voltage fault and security risk existing for discovery vehicle in time, improve vehicle security.
In addition, electric car according to an embodiment of the present invention other compositions and effect for this field ordinary skill
All be for personnel it is known, in order to reduce redundancy, be not repeated herein.
Further embodiment of the present invention also proposed a kind of control method of the measuring circuit of Y capacitance.The survey of the Y capacitance
Measure the measuring circuit that circuit is, for example, Y capacitance described in any one above-mentioned embodiment of the present invention.
Based on this, Fig. 2 is the stream of the control method of the measuring circuit of the Y capacitance of description according to an embodiment of the invention
Cheng Tu.As shown in Fig. 2, method includes the following steps:
Step S1: when pulse signal source is overturn every time, the capacitance of oscillating circuit is obtained, pulse signal source is overturn every time
When voltage difference and Y capacitance end voltage in corresponding voltage difference of each step response moment.Wherein, pulse signal source is every
Voltage difference when secondary overturning is the absolute value of the positive and negative anodes voltage difference of pulse signal source.The end voltage of Y capacitance is in each rank
Jump response moment corresponding voltage difference is the absolute value that pulse signal source jumps the corresponding end voltage difference of front and back Y capacitance.
Step S2: the end of voltage difference and Y capacitance when being overturn every time according to the capacitance of oscillating circuit, pulse signal source
Voltage obtains the capacitance of Y capacitance in corresponding voltage difference of each step response moment.It is deposited to be conducive to discovery vehicle in time
High voltage fault and security risk, improve vehicle security.
Specifically, in one embodiment of the invention, the capacitance of Y capacitance is calculate by the following formula:
Cy=C1 (△ V2- △ Vy)/△ Vy
Wherein, Cy is the capacitance of Y capacitance, and C1 is known electric capacitance, and △ V2 is electricity when pulse signal source is overturn every time
Pressure difference, △ Vy are the end voltage of Y capacitance in corresponding voltage difference of each step response moment.
In one embodiment of the invention, this method further include: before pulse signal source is overturn every time, judge to vibrate
Whether circuit is in stable state；If it is, pulse signal source is allowed to be overturn, otherwise, pulse signal source is forbidden to overturn.
In one embodiment of the invention, this method further include: after obtaining the capacitance of Y capacitance, judge Y capacitance
Capacitance whether be greater than preset value；If it is, Y capacitance fault alarm is carried out, to remind related personnel's on-call maintenance to handle,
It avoids Y capacitance failure from hiding always, causes a hidden trouble to collision safety, improve vehicle security.
It should be noted that the specific implementation of the control method of the measuring circuit of the Y capacitance of the embodiment of the present invention with
The specific implementation of the measuring circuit of the Y capacitance of the embodiment of the present invention is similar, specifically refers to the measuring circuit part of Y capacitance
Description, in order to reduce redundancy, details are not described herein again.
The control method of the measuring circuit of Y capacitance according to an embodiment of the present invention, when pulse signal source is overturn every time, root
The end voltage of voltage difference and Y capacitance when overturning every time according to the capacitance of oscillating circuit, pulse signal source is rung in each step
Moment corresponding voltage difference is answered to obtain the capacitance of Y capacitance, so as to rapidly and accurately measure the capacitance of Y capacitance,
To be conducive to high voltage fault and security risk existing for discovery vehicle in time, vehicle security is improved.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is by claim and its equivalent limits.
Claims (10)
1. a kind of measuring circuit of Y capacitance characterized by comprising
For exporting the pulse signal source of positive negative pulse stuffing signal；
Oscillating circuit, one end of the oscillating circuit are connected with the pulse signal source；
Y capacitance module, the Y capacitance module includes Y capacitance, and one end of the Y capacitance module is another with the oscillating circuit
End is connected, the other end ground connection of the Y capacitance module,
Wherein, every according to the capacitance of the oscillating circuit, the pulse signal source when the pulse signal source is overturn every time
The end voltage of voltage difference and the Y capacitance when secondary overturning obtains described in corresponding voltage difference of each step response moment
The capacitance of Y capacitance.
2. the measuring circuit of Y capacitance according to claim 1, which is characterized in that the capacitance of the Y capacitance passes through following formula
It calculates:
Cy=C1 (△ V2- △ Vy)/△ Vy
Wherein, Cy is the capacitance of the Y capacitance, and C1 is known electric capacitance, when △ V2 is that the pulse signal source is overturn every time
Voltage difference, △ Vy be the Y capacitance end voltage in corresponding voltage difference of each step response moment.
3. the measuring circuit of Y capacitance according to claim 1, which is characterized in that the oscillating circuit is First-order Rc Circuit.
4. a kind of electric car, which is characterized in that the measuring circuit including Y capacitance as described in any one of claims 1-3.
5. a kind of control method of the measuring circuit of Y capacitance as described in any one of claims 1-3, which is characterized in that including
Following steps:
When pulse signal source is overturn every time, the capacitance of oscillating circuit is obtained, the electricity when pulse signal source is overturn every time
Pressure difference and the end voltage of Y capacitance are in corresponding voltage difference of each step response moment；
Voltage difference and the Y capacitance when being overturn every time according to the capacitance of the oscillating circuit, the pulse signal source
Voltage is held to obtain the capacitance of the Y capacitance in corresponding voltage difference of each step response moment.
6. control method according to claim 5, which is characterized in that the capacitance of the Y capacitance is calculate by the following formula:
Cy=C1 (△ V2- △ Vy)/△ Vy
Wherein, Cy is the capacitance of the Y capacitance, and C1 is known electric capacitance, when △ V2 is that the pulse signal source is overturn every time
Voltage difference, △ Vy be the Y capacitance end voltage in corresponding voltage difference of each step response moment.
7. control method according to claim 5, which is characterized in that the voltage difference when pulse signal source is overturn every time
Value is the absolute value of the positive and negative anodes voltage difference of the pulse signal source.
8. control method according to claim 7, which is characterized in that the end voltage of the Y capacitance is in each step response
Moment corresponding voltage difference is the absolute value of the corresponding end voltage difference of the pulse signal source jump front and back Y capacitance.
9. control method according to claim 5, which is characterized in that further include:
Judge whether the oscillating circuit is in stable state；
If it is, the pulse signal source is allowed to be overturn, otherwise, the pulse signal source is forbidden to overturn.
10. control method according to claim 5, which is characterized in that further include:
Judge whether the capacitance of the Y capacitance is greater than preset value；
If it is, carrying out Y capacitance fault alarm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811149752.9A CN109342823B (en) | 2018-09-29 | 2018-09-29 | Measuring circuit and control method of Y capacitor and electric automobile |
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| CN201811149752.9A CN109342823B (en) | 2018-09-29 | 2018-09-29 | Measuring circuit and control method of Y capacitor and electric automobile |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113447720A (en) * | 2020-03-27 | 2021-09-28 | 比亚迪股份有限公司 | Finished automobile Y-capacitor detection system and method and new energy vehicle |
| CN114450186A (en) * | 2019-10-07 | 2022-05-06 | 梅赛德斯-奔驰集团股份公司 | Method for monitoring at least one Y capacitor of vehicle power supply and vehicle power supply |
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