CN105675959B - High-pressure passage current detection circuit - Google Patents
High-pressure passage current detection circuit Download PDFInfo
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- CN105675959B CN105675959B CN201610070557.1A CN201610070557A CN105675959B CN 105675959 B CN105675959 B CN 105675959B CN 201610070557 A CN201610070557 A CN 201610070557A CN 105675959 B CN105675959 B CN 105675959B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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Abstract
The invention discloses a kind of high-pressure passage current detection circuits.The high-pressure passage current detection circuit includes: sample circuit, is connected under sample states with high-pressure passage, disconnects under signal processing state with high-pressure passage, for sampling to the electric current in high-pressure passage, obtains and store sampled voltage；And signal processing circuit, it is connected under signal processing state with sample circuit, is disconnected under sample states with sample circuit, for obtains sample voltage value and determining the current value of high-pressure passage according to sample voltage value, wherein, sample voltage value is the size of sampled voltage.Through the invention, the higher cost detected in the related technology using high-voltage chip to the electric current in high-pressure passage is solved the problems, such as.
Description
Technical field
The present invention relates to detection fields, in particular to a kind of high-pressure passage current detection circuit.
Background technique
Current value in high-pressure passage cannot be measured directly, and Fig. 1 is the schematic diagram of high-pressure passage, as shown in Figure 1, VDDH
For high tension voltage, I is the electric current in high-pressure passage, and 100 be the circuit or power supply connecting with high-pressure passage.In the related technology to height
The method that current value in pressure access is detected is using can the work high-voltage chip in high-pressure passage, such as high voltage amplifier
Device etc. accesses in high-pressure passage, the pressure drop of resistance known to resistance value concatenated in high-pressure passage is converted to electric current, then by connecing
The electronic components such as the resistance on ground convert electrical current into sampled voltage, are measured to sampled voltage to determine the electricity in high-pressure passage
Flow valuve.When being measured in this way to the current value in high-pressure passage, even if the resistance drop in high-pressure passage is smaller,
The potential at resistance both ends is still high potential, can not directly be connect using low-voltage chip and be adopted in voltage of the both ends of resistance to resistance
Collection needs to convert electrical current into the lower sampled voltage side of both ends potential using the electric current in high-voltage chip acquisition high-pressure passage
Low-voltage chip can be used to detect sampled voltage.And this high-voltage chip is since operating voltage is higher, it is 20 volts reachable
More than, therefore manufacturing process is more complex, higher cost, and is easily damaged.
Aiming at the problem that higher cost detected in the related technology using high-voltage chip to the electric current in high-pressure passage,
Currently no effective solution has been proposed.
Summary of the invention
The main purpose of the present invention is to provide a kind of high-pressure passage current detection circuits, to solve to use in the related technology
The problem of higher cost that high-voltage chip samples the electric current in high-pressure passage.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of high-pressure passage current detection circuit.
The high-pressure passage current detection circuit includes: sample circuit, is connected under sample states with high-pressure passage, in signal processing shape
It is disconnected under state with high-pressure passage, for being sampled to the electric current in high-pressure passage, obtains and store sampled voltage；And signal
Processing circuit is connected under signal processing state with sample circuit, disconnects under sample states with sample circuit, for obtaining
Sample voltage value and the current value that high-pressure passage is determined according to sample voltage value, wherein sample voltage value is the big of sampled voltage
It is small.
Further, sample circuit includes: first switch circuit, connect or breaks with high-pressure passage for controlling sample circuit
It opens, signal processing circuit includes: second switch circuit, is connected or disconnected for controlling signal processing circuit with sample circuit.
Further, sample circuit includes: impedor, is connected in high-pressure passage；And sampled voltage energy-storage travelling wave tube,
It is in parallel with impedor, for storing the pressure drop of impedor, obtain sampled voltage.
Further, sampled voltage energy-storage travelling wave tube is a capacitor, alternatively, the capacitor of multiple parallel connections.
Further, signal processing circuit includes: voltage comparator circuit, is connected under signal processing state with sample circuit
It connects, is disconnected under sample states with sample circuit, for receiving sampled voltage and compared with reference voltage, knot is compared in output
Fruit；And processor, it is connected with voltage comparator circuit, for determining sample voltage value according to comparison result and according to sampling electricity
Pressure value determines the current value of high-pressure passage.
Further, high-pressure passage current detection circuit further include: reference voltage circuit is connected with voltage comparator circuit
It connects, for providing reference voltage for voltage comparator circuit.
Further, the high-pressure passage current detection circuit further include: feed circuit is connected with voltage comparator circuit,
It is connected with reference voltage circuit, the comparison result for being exported according to voltage comparator circuit adjusts reference voltage.
Further, sample circuit includes: fixed resistance value resistance, is connected in high-pressure passage；First switch, first end with
The first end of fixed resistance value resistance is connected；Second switch, first end are connected with the second end of fixed resistance value resistance；And the
One capacitor, first end are connected with the second end of first switch, and second end is connected with the second end of second switch.
Further, voltage comparator circuit includes: third switch, and first end is connected with the first incoming level, second end
It is connected with the first end of first capacitor；4th switch, first end are connected with the second end of first capacitor；And comparison circuit
Chip, first input end are connected with the second end of the 4th switch, and for receiving reference voltage, output end is used for the second input terminal
Export comparison result.
Further, high-pressure passage current detection circuit further include: the 5th switch, first end and the first reference level phase
Connection；6th switch, first end are connected with the second reference level；Second capacitor, the second end phase of first end and the 5th switch
Connection, second end are connected with the second end of the 6th switch；7th switch, first end are connected with the second incoming level, and second
End is connected with the first end of the second capacitor；And the 8th switch, first end is connected with the second end of the second capacitor, second end
It is connected with the second input terminal of comparison circuit chip.
The present invention under sample states with high-pressure passage by being connected and breaking under signal processing state with high-pressure passage
The sample circuit opened samples the electric current in high-pressure passage, obtains and store sampled voltage, and in signal processing state
The lower signal processing circuit for being connected with sample circuit and disconnecting under sample states with sample circuit obtains sample voltage value simultaneously
The current value that high-pressure passage is determined according to sample voltage value solves in the related technology using high-voltage chip in high-pressure passage
The problem of higher cost that electric current is detected, and then reached and reduce the cost detected to the electric current in high-pressure passage
Effect.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of high-pressure passage；
Fig. 2 is the schematic diagram of high-pressure passage current detection circuit according to a first embodiment of the present invention；
Fig. 3 is the schematic diagram of the sample circuit in high-pressure passage current detection circuit according to a first embodiment of the present invention；
Fig. 4 is the schematic diagram of the sample circuit in high-pressure passage current detection circuit according to a second embodiment of the present invention；
Fig. 5 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a second embodiment of the present invention；
Fig. 5 b is high-pressure passage current detection circuit showing under signal processing state according to a second embodiment of the present invention
It is intended to；
Fig. 6 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a third embodiment of the present invention；
Fig. 6 b is high-pressure passage current detection circuit showing under signal processing state according to a third embodiment of the present invention
It is intended to；
Fig. 7 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a fourth embodiment of the present invention；
Fig. 7 b is high-pressure passage current detection circuit showing under signal processing state according to a fourth embodiment of the present invention
It is intended to；
Fig. 8 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a fifth embodiment of the present invention；
And
Fig. 8 b is high-pressure passage current detection circuit showing under signal processing state according to a fifth embodiment of the present invention
It is intended to.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, all should belong to the model of the application protection
It encloses.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to embodiments herein described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that it covers and non-exclusive includes, it may include is being not clearly listed or for this
The other units of a little products or equipment inherently.
The embodiment provides a kind of high-pressure passage current detection circuits.
Fig. 2 is the schematic diagram of high-pressure passage current detection circuit according to a first embodiment of the present invention.As shown in Fig. 2, should
High-pressure passage current detection circuit includes sample circuit 10 and signal processing circuit 20.
Sample circuit is connected under sample states with high-pressure passage, disconnects under signal processing state with high-pressure passage,
Sample circuit can sample the electric current in high-pressure passage under sample states, obtain and store sampled voltage, for letter
Number processing circuit handles the sampled voltage.Signal processing circuit is connected under signal processing state with sample circuit,
It is disconnected under sample states with sample circuit, sample voltage value can be obtained under signal processing state and according to sample voltage value
Determine the current value of high-pressure passage, wherein sample voltage value is the size of sampled voltage.Sample circuit passes through in signal processing shape
Under state with high-pressure passage disconnect so that when signal processing circuit is connected under signal processing state with sample circuit not with high pressure
Access is connected, and has achieved the effect that signal processing can be carried out to sampled voltage using low-voltage chip, has thereby reduced to height
The cost that electric current on pressure access is detected.It is high-pressure passage current detection circuit under above-mentioned sample states in high-pressure passage
Current value sampled in the state of, be that high-pressure passage current detection circuit carries out letter to sampled voltage under signal processing state
In the state that number processing is to determine sampled voltage.High-pressure passage current detection circuit converts electrical current into sampling under sample states
Voltage carries out signal processing to sampled voltage under signal processing state, obtains the current value of high-pressure passage.
Sample circuit may include first switch circuit, and first switch circuit is used to control sample circuit and high-pressure passage
It connects or disconnects, signal processing circuit may include second switch circuit, and second switch circuit is for controlling signal processing circuit
It is connected or disconnected with sample circuit.First switch circuit controls connection sample circuit and high-pressure passage under sample states, so that
Sample circuit samples the electric current in high-pressure passage, is converted to sampled voltage or other sampling parameters, and store the sampling
Voltage is handled sampled voltage for signal processing circuit, and second switch circuit controls sample circuit and letter under sample states
Number processing circuit disconnects, with the connection of cut-off signal processing circuit and high-pressure passage；First switch circuit is in signal processing state
The lower connection for disconnecting sample circuit and high-pressure passage, second switch circuit connect sample circuit and signal under signal processing state
Processing circuit, signal processing circuit are still remained open with high-pressure passage under signal processing state, and can be with sample circuit phase
Connection carries out signal processing to the sampled voltage of sample circuit storage and obtains sample voltage value, and calculates in high-pressure passage
Current value.The the connecting or disconnecting can be of first switch circuit and second switch circuit is controlled by central processing unit, can also
Being controlled by circuit or chip.
Preferably, sample circuit may include impedor and sampled voltage energy-storage travelling wave tube.Impedor is connected on high pressure
In access, the electric current on impedor is identical as the electric current in high-pressure passage, and the resistance value of impedor is it is known that if can measure
It is logical can then to obtain high pressure according to the ratio of the resistance value of the voltage drop and impedor of impedor for pressure drop on impedor
Current value in road.Impedor can be the resistance of a fixed resistance value, and choosing the lesser resistance of resistance value can reduce to height
The influence of access is pressed, for example, the resistance for choosing 10m Ω is connected in high-pressure passage, the voltage drop at the resistance both ends is carried out
Sampling, in addition, impedor can also be any form of partial pressure electronic component known to resistance value, such as multiple series-parallel resistance
Deng.Sampled voltage energy-storage travelling wave tube is in parallel with impedor, for storing the pressure drop of impedor, obtains sampled voltage.Sampling electricity
Road needs to disconnect with high-pressure passage under signal processing state, and therefore, sample circuit needs sampled voltage energy-storage travelling wave tube pair
The pressure drop of impedor is stored, so that sample circuit provides impedance after disconnecting with high-pressure passage, for signal processing circuit
The voltage drop at element both ends.Sampled voltage energy-storage travelling wave tube can be the capacitor an of capacitor or multiple parallel connections.Capacitor is in parallel
At the both ends of impedor, it can store and be worth equal charge with the voltage drop at impedor both ends, for signal processing circuit
It obtains and is handled.
Preferably, sample circuit includes the valued resistor of determining being connected in high-pressure passage, first end and fixed resistance value resistance
The switch that is connected of first end, two switches and first end that first end is connected with the second end of fixed resistance value resistance
It is connected with the second end of first switch and a capacitor that second end is connected with the second end of second switch.
Fig. 3 is the schematic diagram of the sample circuit in high-pressure passage current detection circuit according to a first embodiment of the present invention.
As shown in figure 3, sample circuit includes: fixed resistance value resistance R, first capacitor C1, first switch sw1, second switch sw2.VDDH
For the high tension voltage of high-pressure passage, I is the electric current to circulate in high-pressure passage, and 100 be the circuit or power supply connecting with high-pressure passage,
R is fixed resistance known to resistance value, and the first end of R is connected with VDDH, and the second end of R is connected with 100.The first end of sw1
It is connected with the first end of R, the first end of sw2 is connected with the second end of R, and the second end of sw1 is connected with the first end of C1,
The second end of sw2 is connected with the second end of C1.Sw1 is connected under sample states with sw2, and C1 charges under sample states, sw1
It is disconnected under signal processing state with sw2.
Fig. 4 is the schematic diagram of the sample circuit in high-pressure passage current detection circuit according to a second embodiment of the present invention.
As shown in figure 4, sample circuit includes: fixed resistance value resistance R, first capacitor C1, third capacitor C3, first switch sw1, second are opened
Close sw2, the tenth switch sw10.Fixed resistance value resistance R, first capacitor C1, first switch sw1, the connection relationship of second switch sw2
Identical as the sample circuit in the high-pressure passage current detection circuit of first embodiment of the invention, details are not described herein.Sw10's
First end is connected with the first end of C1, and the second end of sw10 is connected with the first end of C3, and the second of the second end of C3 and C1
End is connected.Sw1, sw2 are connected under sample states with sw10, and C1, C3 charge under sample states, and sw1, sw2 and sw10 exist
It is disconnected under signal processing state.
Signal processing circuit may include voltage comparator circuit and processor.Voltage comparator circuit is under signal processing state
It is connected with sample circuit, is disconnected under sample states with sample circuit, for receiving sampled voltage and compared with reference voltage
Compared with output comparison result, processor is connected with voltage comparator circuit, for determining sample voltage value and root according to comparison result
The current value of high-pressure passage is determined according to sample voltage value.Voltage comparator circuit may include amplifier, comparator or analog to digital conversion
Device (Analog to Digital Converter, abbreviation ADC) etc., sampled voltage is compared with reference voltage.Processor can
To determine sample voltage value according to voltage comparator circuit comparison result, determining method, which can be, obtains multiple repairing weld electricity
Pressure, compared with being carried out repeatedly with reference voltage, wherein the reference voltage value compared every time is different, until processor is judged to receive
The sampled voltage comparison result identical with reference voltage exported to voltage comparator circuit.Processor is determining sample voltage value
Later, the current value in high-pressure passage can be calculated.
The high-pressure passage current detection circuit can also include reference voltage circuit, at reference voltage circuit and above-mentioned signal
Voltage comparator circuit in reason circuit is connected, for providing reference voltage for voltage comparator circuit.The reference voltage circuit can
To be to store the reference voltage being added on energy-storage travelling wave tube under sample states by energy-storage travelling wave tubes such as capacitors, in signal processing state
It is lower that the charge stored in energy-storage travelling wave tube discharges, it is input to voltage comparator circuit, so that voltage comparator circuit is compared.The ginseng
The connecting interface for examining voltage comparator circuit and voltage comparator circuit can be with the connecting interface of sample circuit and voltage comparator circuit
It is identical or different, when reference voltage comparison circuit and sample circuit are connected to the same input terminal of voltage comparator circuit, with reference to electricity
Pressure is added with sampled voltage, if reference voltage is identical as the positive-negative polarity of sampled voltage, is input to voltage comparator circuit
The voltage value of input terminal is that the absolute value of reference voltage is added with the absolute value of sampled voltage, if reference voltage and sampled voltage
Positive-negative polarity on the contrary, be then input to the input terminal of voltage comparator circuit voltage value be reference voltage absolute value and sampling electricity
The absolute value of pressure subtracts each other.Preferably, voltage comparator circuit includes that first end is connected and second end and the with the first incoming level
The third switch that the first end of one capacitor is connected, the 4th switch that first end is connected with the second end of first capacitor, and
First input end is connected with the second end of the 4th switch and the comparison circuit chip of the second input terminal reception reference voltage exports
Comparison result.
Preferably, which can also include feed circuit, the feed circuit and above-mentioned electricity
Pressure comparison circuit is connected with reference voltage circuit, and the comparison result that can be exported according to voltage comparator circuit is adjusted with reference to electricity
Pressure.The comparison result of voltage comparator circuit output reference voltage and sampled voltage, feed circuit is according to reference voltage and sampling electricity
The comparison result of pressure adjusts the size of reference voltage value, if reference voltage value is greater than sample voltage value, by reference voltage tune
It is small, if reference voltage value is less than sample voltage value, reference voltage is tuned up, repeatedly repeatedly relatively until voltage is more electric
The output result on road is that reference voltage value is equal to sample voltage value, wherein can be according to the required precision of current value measurement result
Constraint qualification reference voltage value is equal to the error range of sample voltage value.
Preferably, which can also include that first end be connected with the first reference level
Five switch, first end be connected with the second reference level the 6th switch, first end with the 5th switch second end be connected and
The second capacitor for being connected of second end of second end and the 6th switch, first end be connected with the second incoming level and second end and
The first end of second capacitor be connected the 7th switch and first end be connected with the second end of the second capacitor and second end and
The 8th switch that second input terminal of comparison circuit chip is connected.Foregoing circuit structure can be used for executing reference voltage circuit
Function, provide reference voltage for high-pressure passage current detection circuit.
The high-pressure passage current detection circuit that the embodiment provides, by being connected under sample states with high-pressure passage and
The sample circuit disconnected under signal processing state with high-pressure passage samples the electric current in high-pressure passage, obtains and stores
Sampled voltage, and the letter for being connected under signal processing state with sample circuit and being disconnected under sample states with sample circuit
Number processing circuit obtains sample voltage value and determines the current value of high-pressure passage according to sample voltage value, solves in the related technology
The problem of higher cost that the electric current in high-pressure passage is detected using high-voltage chip, and then it is logical to high pressure to have reached reduction
The effect for the cost that the electric current of road is detected.
Fig. 5 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a second embodiment of the present invention,
Fig. 5 b is schematic diagram of the high-pressure passage current detection circuit under signal processing state according to a second embodiment of the present invention.Scheming
In 5a and Fig. 5 b, high-pressure passage current detection circuit includes: fixed resistance value resistance R, first capacitor C1, the second capacitor C2, and first
Switch sw1, second switch sw2, third switch sw3, the 4th switch sw4, the 5th switch sw5, the 6th switch sw6, the 7th switch
Sw7, the 8th switch sw8, comparable chip A.VDDH is the high tension voltage of high-pressure passage, and VDDL is in circuit locating for comparable chip A
Low voltage, I is the electric current that circulates in high-pressure passage, and 100 be the circuit or power supply connecting with high-pressure passage.vrefa,
Vrefb is respectively the first incoming level and the second incoming level, for making the charge in capacitor be input to comparable chip A.
Vrefp, vrefn are respectively the first reference level and the second reference level, for charging for C2, to C2 input reference voltage.
The first end of R is connected with VDDH, and the second end of R is connected with 100.The first end of sw1 is connected with the first end of R
It connects, the first end of sw2 is connected with the second end of R, and the second end of sw1 is connected with the first end of C1, the second end and C1 of sw2
Second end be connected, the first end of sw3 is connected with vrefa, and the second end of sw3 is connected with the first end of C1, the of sw4
One end is connected with the second end of C1, and the second end of sw4 is connected with the non-inverting input terminal of A, first end and the vrefp phase of sw5
Connection, the first end of sw6 is connected with vrefn, and the second end of sw5 is connected with the first end of C2, the second end of sw6 and C2's
Second end is connected, and the first end of sw7 is connected with vrefb, and the second end of sw7 is connected with the first end of C2, and the first of sw8
End is connected with the second end of C2, and the second end of sw8 is connected with the inverting input terminal of A.
Firstly, as shown in Figure 5 a, sw1, sw2, sw5, sw6 connection, sw3, sw4, sw7, sw8 are disconnected, high-pressure passage electric current
Detection circuit is in sample states, and C1 charging obtains sampled voltage, and C2 charging obtains reference voltage.Secondly, as shown in Figure 5 b,
Sw1, sw2, sw5, sw6 are disconnected, and sw3, sw4, sw7, sw8 connection, high-pressure passage current detection circuit are in signal processing state,
The received input voltage value of the non-inverting input terminal of A is the summation of vrefa and sample voltage value, and the inverting input terminal of A is received defeated
Enter the summation that voltage value is vrefb and reference voltage value, A exports comparison result according to the comparison of two input terminals.High-pressure passage
Current detection circuit can also include feed circuit, vrefp, vrefn be adjusted according to the output result of A, so that C2 is in the case where being in
The reference voltage after feedback regulation is received when one sample states.
Fig. 6 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a third embodiment of the present invention,
Fig. 6 b is schematic diagram of the high-pressure passage current detection circuit under signal processing state according to a third embodiment of the present invention.Scheming
In 6a and Fig. 6 b, high-pressure passage current detection circuit includes: fixed resistance value resistance R, first capacitor C1, the second capacitor C2, and first
Switch sw1, second switch sw2, third switch sw3, the 4th switch sw4, the 5th switch sw5, the 6th switch sw6, the 7th switch
Sw7, the 8th switch sw8, the 9th switch sw9, comparable chip A.VDDH is the high tension voltage of high-pressure passage, and VDDL is comparable chip
Low voltage in circuit locating for A, I are the electric current to circulate in high-pressure passage, and 100 be the circuit or electricity connecting with high-pressure passage
Source.Vrefa, vrefb, vrefc are respectively the first incoming level, the second incoming level and third incoming level, for making capacitor
In charge be input to comparable chip A.Vrefp, vrefn are respectively the first reference level and the second reference level, for being C2
Charging, to C2 input reference voltage.
The first end of R is connected with VDDH, and the second end of R is connected with 100.The first end of sw1 is connected with the first end of R
It connects, the first end of sw2 is connected with the second end of R, and the second end of sw1 is connected with the first end of C1, the second end and C1 of sw2
Second end be connected, the first end of sw3 is connected with vrefa, and the second end of sw3 is connected with the first end of C1, the of sw4
One end is connected with the second end of C1, and the second end of sw4 is connected with the non-inverting input terminal of A, first end and the vrefp phase of sw5
Connection, the first end of sw6 is connected with vrefn, and the second end of sw5 is connected with the first end of C2, the second end of sw6 and C2's
Second end is connected, and the first end of sw7 is connected with vrefb, and the second end of sw7 is connected with the first end of C2, and the first of sw8
End is connected with the second end of C2, and the second end of sw8 is connected with the first end of sw4, and the first end of sw9 is connected with vrefc,
Sw9 is connected with the inverting input terminal of A.
Firstly, as shown in Figure 6 a, sw1, sw2, sw5, sw6 connection, sw3, sw4, sw7, sw8, sw9 are disconnected, high-pressure passage
Current detection circuit is in sample states, and C1 charging obtains sampled voltage, and C2 charging obtains reference voltage.Secondly, such as Fig. 6 b
Shown, sw1, sw2, sw5, sw6 are disconnected, and sw3, sw4, sw7, sw8, sw9 connection, high-pressure passage current detection circuit are in signal
Processing status, the received input voltage value of the non-inverting input terminal of A be vrefa, sample voltage value, vrefb, reference voltage value it is total
Third incoming level vrefc, A are received with the inverting input terminal of, A, and comparison result is exported according to the comparison of two input terminals.High pressure
Passage current detection circuit can also include feed circuit, vrefp, vrefn be adjusted according to the output result of A, so that C2 is locating
The reference voltage after feedback regulation is received when next sample states.
Fig. 7 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a fourth embodiment of the present invention,
Fig. 7 b is schematic diagram of the high-pressure passage current detection circuit under signal processing state according to a fourth embodiment of the present invention.Scheming
In 7a and Fig. 7 b, high-pressure passage current detection circuit includes: fixed resistance value resistance R, first capacitor C1, the second capacitor C2, third
Capacitor C3, first switch sw1, second switch sw2, third switch sw3, the 4th switch sw4, the 5th switch sw5, the 6th switch
Sw6, the 7th switch sw7, the 8th switch sw8, the tenth switch sw10, the 11st switch sw11, comparable chip A.The embodiment packet
The high-pressure passage current detection circuit for including second embodiment of the invention, in the high-pressure passage current detecting of second embodiment of the invention
On the basis of circuit, third capacitor C3, the tenth switch sw10 and the 11st switch sw11 are increased.The first end of sw10 and C1's
First end is connected, and the second end of sw10 is connected with the first end of C3, and the second end of C3 is connected with the second end of C2, sw11
First end be connected with the first end of C3, the second end of sw11 is connected with the second end of C3.
The sample states of high-pressure passage current detection circuit are as shown in Figure 7a, sw1, sw2, sw5, sw6, sw10 connection,
Sw3, sw4, sw7, sw8, sw11 are disconnected, and C1 and C3 charge, acquisition sampled voltage, and C2 charging obtains reference voltage.High pressure is logical
The signal processing state of road current detection circuit is as shown in Figure 7b, sw1, sw2, sw5, sw6, sw10 disconnect, sw3, sw4, sw7,
Sw8, sw11 connection, the received input voltage value of the non-inverting input terminal of A are the total of vrefa and the sample voltage value on C1 and C3
It is the summation of the reference voltage value on vrefb and C2 with, the received input voltage value of the inverting input terminal of A, A is inputted according to two
The comparison at end exports comparison result.High-pressure passage current detection circuit can also include feed circuit, according to the output result tune of A
Vrefp, vrefn are saved, so that C2 receives the reference voltage after feedback regulation when being in next sample states.
Fig. 8 a is schematic diagram of the high-pressure passage current detection circuit under sample states according to a fifth embodiment of the present invention,
Fig. 8 b is schematic diagram of the high-pressure passage current detection circuit under signal processing state according to a fifth embodiment of the present invention.Scheming
In 8a and Fig. 8 b, high-pressure passage current detection circuit includes: fixed resistance value resistance R, first capacitor C1, the second capacitor C2, third
Capacitor C3, first switch sw1, second switch sw2, third switch sw3, the 4th switch sw4, the 5th switch sw5, the 6th switch
Sw6, the 7th switch sw7, the 8th switch sw8, the 9th switch sw9, the tenth switch sw10, the 11st switch sw11, comparable chip
A.The embodiment includes the high-pressure passage current detection circuit of third embodiment of the invention, in the high pressure of third embodiment of the invention
On the basis of passage current detection circuit, third capacitor C3, the tenth switch sw10 and the 11st switch sw11 are increased.Sw10's
First end is connected with the first end of C1, and the second end of sw10 is connected with the first end of C3, and the second of the second end of C3 and C2
End is connected, and the first end of sw11 is connected with the first end of C3, and the second end of sw11 is connected with the second end of C3.
The sample states of high-pressure passage current detection circuit are as shown in Figure 8 a, sw1, sw2, sw5, sw6, sw10 connection,
Sw3, sw4, sw7, sw8, sw9, sw11 are disconnected, and C1 and C3 charge, acquisition sampled voltage, and C2 charging obtains reference voltage.It is high
Press the signal processing state of passage current detection circuit as shown in Figure 8 b, sw1, sw2, sw5, sw6, sw10 are disconnected, sw3, sw4,
Sw7, sw8, sw9, sw11 connection, the received input voltage value of the non-inverting input terminal of A are the sample voltage value on vrefa, C1, C3
On sample voltage value, the summation of reference voltage value on vrefb, C2, the inverting input terminal of A receives third incoming level
Vrefc, A export comparison result according to the comparison of two input terminals.High-pressure passage current detection circuit can also include feedback electricity
Road adjusts vrefp, vrefn according to the output result of A, adjusts so that C2 is received when being in next sample states by feedback
Reference voltage after section.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
Be performed by computing device in the storage device, perhaps they are fabricated to each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific
Hardware and software combines.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of high-pressure passage current detection circuit characterized by comprising
Sample circuit is connected under sample states with high-pressure passage, disconnects under signal processing state with the high-pressure passage,
For being sampled to the electric current in the high-pressure passage, obtains and store sampled voltage；And
Signal processing circuit is connected under the signal processing state with the sample circuit, under the sample states with
The sample circuit disconnects, for obtaining sample voltage value and determining the electric current of the high-pressure passage according to the sample voltage value
Value, wherein the sample voltage value is the size of the sampled voltage.
2. high-pressure passage current detection circuit according to claim 1, which is characterized in that
The sample circuit includes: first switch circuit, connect or breaks with the high-pressure passage for controlling the sample circuit
It opens,
The signal processing circuit includes: second switch circuit, for controlling the signal processing circuit and the sample circuit
It connects or disconnects.
3. high-pressure passage current detection circuit according to claim 1, which is characterized in that the sample circuit includes:
Impedor is connected in the high-pressure passage；And
Sampled voltage energy-storage travelling wave tube, it is in parallel with the impedor, for storing the pressure drop of the impedor, obtain described adopt
Sample voltage.
4. high-pressure passage current detection circuit according to claim 3, which is characterized in that the sampled voltage energy-storage travelling wave tube
For a capacitor, alternatively, the capacitor of multiple parallel connections.
5. high-pressure passage current detection circuit according to claim 1, which is characterized in that the signal processing circuit packet
It includes:
Voltage comparator circuit is connected under the signal processing state with the sample circuit, under the sample states with
The sample circuit disconnects, and for receiving the sampled voltage and compared with reference voltage, exports comparison result；And
Processor is connected with the voltage comparator circuit, for determining the sample voltage value simultaneously according to the comparison result
The current value of the high-pressure passage is determined according to the sample voltage value.
6. high-pressure passage current detection circuit according to claim 5, which is characterized in that the high-pressure passage current detecting
Circuit further include:
Reference voltage circuit is connected with the voltage comparator circuit, for providing the reference for the voltage comparator circuit
Voltage.
7. high-pressure passage current detection circuit according to claim 6, which is characterized in that the high-pressure passage current detecting
Circuit further include:
Feed circuit is connected with the voltage comparator circuit, is connected with the reference voltage circuit, for according to the electricity
Pressure ratio adjusts the reference voltage compared with the comparison result of circuit output.
8. high-pressure passage current detection circuit according to claim 5, which is characterized in that the sample circuit includes:
Fixed resistance value resistance is connected in the high-pressure passage；
First switch, first end are connected with the first end of the fixed resistance value resistance；
Second switch, first end are connected with the second end of the fixed resistance value resistance；And
First capacitor, first end are connected with the second end of the first switch, the second end of second end and the second switch
It is connected.
9. high-pressure passage current detection circuit according to claim 8, which is characterized in that the voltage comparator circuit packet
It includes:
Third switch, first end are connected with the first incoming level, and second end is connected with the first end of the first capacitor；
4th switch, first end are connected with the second end of the first capacitor；And
Comparison circuit chip, first input end are connected with the second end of the 4th switch, and the second input terminal is for receiving institute
Reference voltage is stated, output end is for exporting the comparison result.
10. high-pressure passage current detection circuit according to claim 9, which is characterized in that the high-pressure passage electric current inspection
Slowdown monitoring circuit further include:
5th switch, first end are connected with the first reference level；
6th switch, first end are connected with the second reference level；
Second capacitor, first end are connected with the second end of the 5th switch, the second end of second end and the 6th switch
It is connected；
7th switch, first end are connected with the second incoming level, and second end is connected with the first end of second capacitor；With
And
8th switch, first end is connected with the second end of second capacitor, and the of second end and the comparison circuit chip
Two input terminals are connected.
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| CN106093521A (en) * | 2016-06-17 | 2016-11-09 | 广州极飞电子科技有限公司 | Electric current detecting method, device and battery management system |
| TWI843415B (en) * | 2023-01-18 | 2024-05-21 | 大陸商星宸科技股份有限公司 | Fail-safe input/output device and voltage switching method |
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