CN106841763A - A kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method - Google Patents
A kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention discloses a kind of middle high-pressure RHVC voltage detecting circuit and voltage detection method, it is related to variable-frequency control technique field, including phase-shifting transformer, for high voltage to be converted into 380V low voltages；Differential amplifier circuit, for phase voltage to be converted into 5V~+5V AC signals；First voltage follows circuit and second voltage to follow circuit, and it is used to improve input impedance, reduces output impedance；Anti-phase add circuit, it includes operational amplification circuit and reference voltage circuit, and it is used to be added three-phase phase voltage with reference voltage value, and phase voltage is converted to direct current signal.Middle high-pressure RHVC voltage detecting circuit differential amplifier circuit of the invention, voltage follower circuit and anti-phase add circuit instead of voltage transformer, it is to avoid the harmonic error existed during traditional middle high-pressure RHVC input voltage measurement.
Description
Technical field
The present invention relates to variable-frequency control technique field, and in particular to a kind of middle high-pressure RHVC voltage detecting electricity
Road and voltage detection method.
Background technology
For middle high-pressure RHVC, it is necessary to carry out real-time detection to input voltage, so that master control system realizes V/
F controls or vector control algorithm and voltage show；Meanwhile, some of middle high-pressure RHVC are controlled and defencive function,
Also necessarily having accurate voltage detecting in real time can just be achieved.
At present, middle high-pressure RHVC input voltage measurement is examined typically by electromagnetic potential transformer
Survey, this voltage detecting mode has the following disadvantages：One is that voltage transformer volume is larger, and influence is used；Two is mutual induction of voltage
Device in the measurements, high-voltage frequency conversion and speed-adjusting device input voltage when, cause measurement error because middle high-pressure input voltage has harmonic wave
It is larger.
The content of the invention
For defect present in prior art, it is an object of the invention to provide one kind have good electrical isolation capabilities,
The middle high-pressure RHVC voltage detecting circuit and voltage detection method of antijamming capability.
To achieve the above objectives, the present invention is adopted the technical scheme that：
A kind of middle high-pressure RHVC voltage detecting circuit, it is used to generate voltage detection signal to DSP master control cores
Piece comparative analysis, including：
Phase-shifting transformer, for high voltage to be converted into 380V low voltages；
Differential amplifier circuit, for phase voltage to be converted into -5V~+5V AC signals；
First voltage follows circuit and second voltage to follow circuit, and it is used to improve input impedance, reduces output impedance；
Anti-phase add circuit, it includes operational amplification circuit and reference voltage circuit, its be used for just three-phase phase voltage with
Reference voltage value is added, and phase voltage is converted into DC voltage detection signal.
On the basis of above-mentioned technical proposal, the phase-shifting transformer be many secondary phase-shifting transformers, and with auxiliary around
Group.
On the basis of above-mentioned technical proposal, the phase-shifting transformer each it is auxiliary around side phase with described in N phases and one
Differential amplifier circuit is connected.
On the basis of above-mentioned technical proposal, also including a RC filter circuits, described RC filter circuits one end and described
Two voltage follower circuits are connected, and the other end is connected with DSP main control chips AD sampling pins.
On the basis of above-mentioned technical proposal, first voltage follows circuit one described in the every phase road of the voltage detecting circuit
End is connected with the differential amplifier circuit, and the other end is connected with the anti-phase add circuit；The second voltage follows circuit one
End is connected with the anti-phase add circuit, and the other end is connected with the filtering process circuit.
On the basis of above-mentioned technical proposal, the differential amplifier circuit include the first operational amplifier, first resistor string,
Second resistance string, the first diode, the second diode；First operational amplifier in-phase input end connection second resistance string and
Second diode；Also include second resistance in parallel and the second electric capacity, the second resistance is grounded with one end of the second electric capacity, separately
One end is connected with first operational amplifier；Described second resistance string one end is connected with the second diode input, separately
One end connection phase-shifting transformer is auxiliary around side phase voltage output end；The first operational amplifier inverting input connects first resistor
String and the first diode；Also include first resistor in parallel and the first electric capacity, and the other end of second resistance and the second electric capacity connects
Connect first operational amplifier output terminal；Described first resistor string one end is connected with the first diode input, another
End connection phase-shifting transformer is auxiliary around side phase zero line output terminal.
On the basis of above-mentioned technical proposal, the first voltage follow circuit include the second operational amplifier, the 3rd electricity
Resistance and the 3rd electric capacity；The second operational amplifier inverting input connects second operational amplifier output terminal and the 3rd electricity
Resistance；The 3rd resistor other end is connected with the 3rd electric capacity, the 3rd electric capacity other end ground connection；The second operational amplifier homophase input
End connection first operational amplifier output terminal.
On the basis of above-mentioned technical proposal, the anti-phase add circuit include the 3rd operational amplifier, 3rd resistor string,
4th resistance string, the 4th resistance, the 5th resistance, the 6th resistance, the 4th electric capacity and the 5th electric capacity；3rd operational amplifier is same
Phase input connects the 6th resistance, the 6th resistance other end ground connection；The 3rd operational amplifier inverting input connection
4th resistance string, 3rd resistor string, the 4th resistance and the 4th electric capacity, the 4th resistance are in parallel with the 4th electric capacity, and the 4th resistance with
The 4th electric capacity other end connects the 3rd operational amplifier output terminal and the 5th resistance；5th resistance other end connection the
Five electric capacity, the 5th electric capacity other end ground connection；4th resistance string the other end connection 3rd resistor, the 3rd resistor other end with it is described
The output end of the second operation amplifier electrical equipment is connected；The other end of 3rd resistor string is connected with reference phase voltage.
On the basis of above-mentioned technical proposal, the second voltage follow circuit include four-operational amplifier, the 7th electricity
Resistance, the 8th resistance, the 6th electric capacity and the 3rd diode；The four-operational amplifier inverting input connects the 7th resistance and the
Six electric capacity, the 7th resistance is in parallel with the 6th electric capacity, and the 7th resistance is connected the four-operational amplifier with the 6th electric capacity other end
Output end and the 8th resistance；The 8th resistance other end connects the 3rd diode and DSP main control chips AD sampling pins；Described 4th
Operational amplifier in-phase input end connects the 5th resistance and the 5th electric capacity.
The present invention also provides a kind of middle high-pressure RHVC input voltage measurement method, comprises the following steps：
S1, using band assists winding phase-shifting transformer by input side high-voltage variable be 380V voltage signals；
S2, is converted into -5V~+5V ac voltage signals, and pass through using differential amplifier circuit by the 380V voltage signals
Overvoltage follows circuit output to anti-phase add circuit；
, with reference voltage value be added the -5V~+5V ac voltage signals using anti-phase add circuit by S3, make -5V~
+ 5V AC signals are converted into 0~+3V DC voltage detection signals, then by delivering to DSP after voltage follower circuit and filtering process
On main control chip AD sampling pins；
S4, DSP main control chip compare the DC voltage detection signal of collection and default normal value, such as normal
In the range of, then attonity；Such as exceed normal range (NR), then send alarm signal to RHVC control end.
Compared with prior art, the advantage of the invention is that：
(1) middle high-pressure RHVC voltage detecting circuit differential amplifier circuit of the invention, voltage follower circuit
Voltage transformer is instead of with anti-phase add circuit, it is to avoid use the traditional middle high-pressure RHVC of voltage transformer
The harmonic error existed during input voltage measurement.
(2) middle high-pressure RHVC voltage detecting circuit of the invention is used with many secondary phase shifts of assists winding
Transformer carries out change press operation, can suppress the harmonic wave of input voltage, reduces the additive error of measurement.
(3) middle high-pressure RHVC voltage detection method of the invention is reduced and set without using voltage transformer
Standby volume, it is easy to install and use.
Brief description of the drawings
Fig. 1 is middle high-pressure RHVC voltage detection method operation principle block diagram in the embodiment of the present invention；
Fig. 2 is A phases phase voltage sample differential amplifying circuit and voltage follower circuit schematic diagram in the embodiment of the present invention；
Fig. 3 is A phases phase voltage sampling inversion add circuit and voltage follower circuit schematic diagram in the embodiment of the present invention；
Fig. 4 is B phases phase voltage sample differential amplifying circuit and voltage follower circuit schematic diagram in the embodiment of the present invention；
Fig. 5 is B phases phase voltage sampling inversion add circuit and voltage follower circuit schematic diagram in the embodiment of the present invention；
Fig. 6 is C phases phase voltage sample differential amplifying circuit and voltage follower circuit schematic diagram in the embodiment of the present invention；
Fig. 7 is C phases phase voltage sampling inversion add circuit and voltage follower circuit schematic diagram in the embodiment of the present invention；
In figure：1- first resistor strings, 2- second resistance strings.
Specific embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
Shown in Figure 1, the embodiment of the present invention provides a kind of middle high-pressure RHVC voltage detecting circuit, including：
Phase-shifting transformer, for high voltage to be converted into 380V low voltages；
Differential amplifier circuit, for phase voltage to be converted into -5V~+5V AC signals；
First voltage follows circuit and second voltage to follow circuit, and it is used to improve input impedance, reduces output impedance；
Anti-phase add circuit, it includes operational amplification circuit and reference voltage circuit, its be used for just three-phase phase voltage with
Reference voltage value is added, and phase voltage is converted to direct current signal.
Further, a RC filter circuits are may also include, described RC filter circuits one end follows electricity with the second voltage
Road is connected, and the other end is connected with DSP main control chips AD sampling pins.Detection signal can be made to be input into main control chip take a step forward removal
Harmonic wave, reduces measurement error
Further, the phase-shifting transformer is chosen as many secondary phase-shifting transformers, and with assists winding.This set
The harmonic wave of input voltage can be suppressed, reduce the additive error of measurement.
Further, the phase-shifting transformer each it is auxiliary around side phase with N phases and a differential amplifier circuit phase
Even.
Further, first voltage follows circuit on one side and the difference to put described in the every phase road of the voltage detecting circuit
Big circuit is connected, and the other end is connected with the anti-phase add circuit；The second voltage follow circuit on one side and it is described it is anti-phase plus
Method circuit is connected, and the other end is connected with the filtering process circuit.
Fig. 2 be the practical middle high-pressure frequency control dress input voltage measurement method one embodiment in A phase voltages adopt
Sample differential amplifier circuit and voltage follower circuit schematic diagram, the differential amplifier circuit include operational amplifier U2A, resistance R5,
R6, R7, R8, R9, R10, R11, R12, R13, R14, resistance R21, R22, R23, R24, R25, R26, R27, R28, R29, R30,
Diode D1, D3, resistance R15, R31, electric capacity C4, C10；The operational amplifier U2A in-phase input ends connection resistance R30,
R31, diode D3 and electric capacity C10, diode D3 play clamping action；The resistance R30 other ends and resistance R21, R22, R23, R24,
R25, R26, R27, R28, R29 connect, and resistance R23 other ends connection phase-shifting transformer is auxiliary around side A phase output terminals；Resistance R31 with
Electric capacity C10 is in parallel, and the other end of resistance R31 and electric capacity C10 is grounded；The operational amplifier U2A inverting inputs connection electricity
Resistance R14, R15, diode D1 and electric capacity C4, diode D1 play clamping action；The resistance R14 other ends and R5, R6, R7, R8, R9,
R10, R11, R12, R13 connect, and resistance R7 other ends connection phase-shifting transformer is auxiliary around side N phase output terminals；Resistance R15 and electric capacity C4
Parallel connection, and the other end of resistance R15 and electric capacity C4 connects the operational amplifier U2A output ends；
The voltage follower circuit includes operational amplifier U2B, resistance R19, electric capacity C8；The operational amplifier U2B is anti-
The phase input connection calculation amplifier U2B output ends and resistance R19；The resistance R19 other ends are connected with electric capacity C8, and electric capacity C8 is another
One end is grounded, and resistance R19 and electric capacity C8 constitutes RC filter circuits；The operational amplifier U2B in-phase input ends connect the fortune
Calculate amplifier U2A output ends.
Fig. 3 be the practical middle high-pressure frequency control dress input voltage measurement method one embodiment in A phase phase voltages
Sampling inversion add circuit and voltage follower circuit schematic diagram, the anti-phase add circuit include operational amplifier U1A, resistance
R1, R2, R3, R16, R18, R20, electric capacity C1, C6；The operational amplifier U1A in-phase input ends connect resistance R20, resistance R20
The other end is grounded；The operational amplifier U1A inverting inputs connect resistance R16, R2, R3 and electric capacity C1, resistance R3 and electric capacity
C1 is in parallel, and resistance R3 is connected the operational amplifier U1A output ends and resistance R18 with the electric capacity C1 other ends, and resistance R18 is another
End connection electric capacity C6, electric capacity C6 other ends ground connection, resistance R18 and electric capacity C6 constitute RC filter circuits；The other end of resistance R16 connects
Connecting resistance R19, the resistance R19 other ends are connected with the output end of the operation amplifier electrical equipment U2B；The other end and resistance of resistance R2
R1 is connected, and the other end of resistance R1 is connected with A phase reference voltages；
The voltage follower circuit includes operational amplifier U1B, resistance R4, R17, electric capacity C2, diode D2；Institute's art computing
Amplifier U1B inverting inputs connect resistance R4 and electric capacity C2, and resistance R4 is in parallel with electric capacity C2, resistance R4 and the electric capacity C2 other ends
The connection calculation amplifier U1B output ends and the 7th resistance；7th resistance other end connection diode D2 and DSP main control chip AD
Sampling pin, diode D2 plays clamping action；The operational amplifier U1B in-phase input ends connection resistance R18 and electric capacity C6,
R18 and electric capacity C6 constitutes RC filter circuits, and resistance R18 connects the operational amplifier U1A output ends.
Fig. 4 be the practical middle high-pressure frequency control dress input voltage measurement method one embodiment in B phase voltages adopt
Sample differential amplifier circuit and voltage follower circuit schematic diagram, the differential amplifier circuit include operational amplifier U3A, resistance R32,
R33, R34, R35, R36, R37, R38, R41, R42, R43, resistance R48, R49, R52, R53, R54, R55, R56, R58, R59,
R60, diode D4, D6, resistance R44, R62, electric capacity C11, C19；The operational amplifier U3A in-phase input ends connect resistance
R60, R62, diode D6 and electric capacity C19, diode D6 play clamping action；The resistance R60 other ends and resistance R48, R49, R52,
R53, R54, R55, R56, R58, R59 connect, and resistance R59 other ends connection phase-shifting transformer is auxiliary around side B phase output terminals；Resistance
R62 is in parallel with electric capacity C19, and the other end of resistance R62 and electric capacity C19 is grounded；The operational amplifier U3A inverting inputs connect
Connecting resistance R43, R44, diode D4 and electric capacity C11, diode D4 play clamping action；The resistance R43 other ends and R32, R33,
R34, R35, R36, R37, R38, R41, R42 connect, and resistance R34 other end connection phase-shifting transformer is auxiliary around side N phase output terminals；Electricity
Resistance R44 and electric capacity C11 is in parallel, and the other end of resistance R44 and electric capacity C11 connects the operational amplifier U3A output ends；
The voltage follower circuit includes operational amplifier U3B, resistance R47, electric capacity C16；Art operational amplifier U3B is anti-for institute
The phase input connection calculation amplifier U3B output ends and resistance R47；The resistance R47 other ends are connected with electric capacity C16, electric capacity C16
The other end is grounded, and resistance R47 and electric capacity C16 constitutes RC filter circuits；The operational amplifier U3B in-phase input ends connection is described
Operational amplifier U3A output ends.
Fig. 5 be the practical middle high-pressure frequency control dress input voltage measurement method one embodiment in B phase phase voltages
Sampling inversion add circuit and voltage follower circuit schematic diagram, the anti-phase add circuit include operational amplifier U4A, resistance
R39, R40, R45, R50, R57, R61, electric capacity C12, C18；The operational amplifier U4A in-phase input ends connect resistance R61, electricity
Resistance R61 other end ground connection；The operational amplifier U4A inverting inputs connect resistance R40, R45, R50 and electric capacity C12, resistance
R45 is in parallel with electric capacity C12, and resistance R45 is connected the operational amplifier U4A output ends and resistance with the electric capacity C12 other ends
R57, resistance the R57 other end connect electric capacity C18, and electric capacity C18 other ends ground connection, resistance R57 and electric capacity C18 constitutes RC filtered electricals
Road；The other end connection resistance R47 of resistance R50, the resistance R47 other ends are connected with the output end of the operation amplifier electrical equipment U3B；
The other end of resistance R40 is connected with resistance R39, and the other end of resistance R39 is connected with B phase reference voltages；
The voltage follower circuit includes operational amplifier U4B, resistance R46, R51, electric capacity C14, diode D5；Institute's art fortune
Calculate amplifier U4B inverting inputs connection resistance R46 and electric capacity C14, resistance R46 in parallel with electric capacity C14, resistance R46 and electric capacity
The C14 other ends connection calculation amplifier U4B output ends and resistance R51；The resistance R51 other ends connect diode D5 and DSP master
Control chip AD sampling pins, diode D5 plays clamping action；Operational amplifier U4B in-phase input ends connection resistance R57 with
Electric capacity C18, R57 constitute RC filter circuits with electric capacity C18, and resistance R57 connects the operational amplifier U4A output ends.
Fig. 6 be the practical middle high-pressure frequency control dress input voltage measurement method one embodiment in C phase voltages adopt
Sample differential amplifier circuit and voltage follower circuit schematic diagram, the differential amplifier circuit include operational amplifier U5A, resistance R63,
R64, R65, R66, R67, R68, R69, R70, R71, R72, resistance R78, R79, R81, R82, R83, R84, R85, R86, R87,
R88, diode D7, D8, resistance R73, R89, electric capacity C21, C28；The operational amplifier U5A in-phase input ends connect resistance
R88, R89, diode D8 and electric capacity C28, diode D8 play clamping action；The resistance R88 other ends and resistance R78, R79, R81,
R82, R83, R84, R85, R86, R87 connect, and resistance R81 other ends connection phase-shifting transformer is auxiliary around side C phase output terminals；Resistance
R89 is in parallel with electric capacity C28, and the other end of resistance R89 and electric capacity C28 is grounded；The operational amplifier U5A inverting inputs connect
Connecting resistance R72, R73, diode D7 and electric capacity C21, diode D7 play clamping action；The resistance R72 other ends and R63, R64,
R65, R66, R67, R68, R69, R70, R71 connect, and resistance R65 other ends connection phase-shifting transformer is auxiliary around side N phase output terminals；Electricity
Resistance R73 and electric capacity C21 is in parallel, and the other end of resistance R73 and electric capacity C21 connects the operational amplifier U5A output ends；
The voltage follower circuit includes operational amplifier U5B, resistance R74, electric capacity C23；Art operational amplifier U5B is anti-for institute
The phase input connection calculation amplifier U5B output ends and resistance R74；The resistance R74 other ends are connected with electric capacity C23, electric capacity C23
The other end is grounded, and resistance R74 and electric capacity C23 constitutes RC filter circuits；The operational amplifier U5B in-phase input ends connection is described
Operational amplifier U5A output ends.
Fig. 7 be the practical middle high-pressure frequency control dress input voltage measurement method one embodiment in C phase phase voltages
Sampling inversion add circuit and voltage follower circuit schematic diagram, the anti-phase add circuit include operational amplifier U6A, resistance
R75, R76, R77, R90, R92, R93, electric capacity C25, C29；The operational amplifier U6A in-phase input ends connect resistance R93, electricity
Resistance R93 other end ground connection；The operational amplifier U6A inverting inputs connect resistance R76, R77, R90 and electric capacity C25, resistance
R77 is in parallel with electric capacity C25, and resistance R77 is connected the operational amplifier U6A output ends and resistance with the electric capacity C25 other ends
R92, resistance the R92 other end connect electric capacity C29, and electric capacity C29 other ends ground connection, resistance R92 and electric capacity C29 constitutes RC filtered electricals
Road；The other end connection resistance R74 of resistance R90, the resistance R74 other ends are connected with the output end of the operation amplifier electrical equipment U5B；
The other end of resistance R76 is connected with resistance R75, and the other end of resistance R75 is connected with B phase reference voltages；
The voltage follower circuit includes operational amplifier U6B, resistance R80, R91, electric capacity C26, diode D9；Institute's art fortune
Calculate amplifier U6B inverting inputs connection resistance R80 and electric capacity C26, resistance R80 in parallel with electric capacity C26, resistance R80 and electric capacity
The C26 other ends connection calculation amplifier U6B output ends and resistance R91；The resistance R91 other ends connect diode D9 and DSP master
Control chip AD sampling pins, diode D9 plays clamping action；Operational amplifier U6B in-phase input ends connection resistance R92 with
Electric capacity C29, R92 constitute RC filter circuits with electric capacity C29, and resistance R92 connects the operational amplifier U6A output ends.
Preferably, the model TL082ID of the operational amplifier for using in the above-described embodiments, the model of diode
MMBD7000LT1。
The present invention also provides a kind of middle high-pressure RHVC input voltage measurement method, comprises the following steps：
S1, using band assists winding phase-shifting transformer by input side high-voltage variable be 380V voltage signals；
S2, is converted into -5V~+5V ac voltage signals, and pass through using differential amplifier circuit by the 380V voltage signals
Overvoltage follows circuit output；
, with reference voltage value be added the -5V~+5V ac voltage signals using anti-phase add circuit by S3, make -5V~
+ 5V AC signals are converted into 0~+3V direct current signals, then by delivering to DSP main control chips after voltage follower circuit and filtering process
Calculating treatment on AD sampling pins.
S4, DSP main control chip compare the DC voltage detection signal of collection and default normal value, such as normal
In the range of, then attonity；Such as exceed normal range (NR), then send alarm signal to RHVC control end.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
On the premise of the principle of the invention, some improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (10)
1. a kind of middle high-pressure RHVC voltage detecting circuit, it is used to generate voltage detection signal to DSP main control chips
Comparative analysis, including：
Phase-shifting transformer, for high voltage to be converted into 380V low voltages；
Differential amplifier circuit, for phase voltage to be converted into -5V~+5V AC signals；
First voltage follows circuit and second voltage to follow circuit, and it is used to improve input impedance, reduces output impedance；
Anti-phase add circuit, it includes operational amplification circuit and reference voltage circuit, and it is used for just three-phase phase voltage and benchmark
Magnitude of voltage is added, and phase voltage is converted into DC voltage detection signal.
2. middle high-pressure RHVC voltage detecting circuit as claimed in claim 1, it is characterised in that：The phase shift becomes
Depressor is many secondary phase-shifting transformers, and with assists winding.
3. middle high-pressure RHVC voltage detecting circuit as claimed in claim 2, it is characterised in that：The phase shift becomes
Depressor each auxiliary be connected with N phases and a differential amplifier circuit around side phase.
4. middle high-pressure RHVC voltage detecting circuit as claimed in claim 1, it is characterised in that：Also include a RC
Filter circuit, described RC filter circuits one end follows circuit to be connected with the second voltage, the other end and the DSP main control chips
AD sampling pin connections.
5. middle high-pressure RHVC voltage detecting circuit as claimed in claim 4, it is characterised in that：The voltage inspection
Slowdown monitoring circuit follows circuit on one side to be connected with the differential amplifier circuit per first voltage described in phase road, the other end and described anti-phase
Add circuit is connected；The second voltage follows circuit on one side to be connected with the anti-phase add circuit, the other end and the filtering
Process circuit is connected.
6. middle high-pressure RHVC voltage detecting circuit as claimed in claim 1, it is characterised in that：The difference is put
Big circuit includes the first operational amplifier (U2A, U3A, U5A), first resistor string (1), second resistance string (2), the first diode
(D1, D4, D7), the second diode (D3, D6, D8)；First operational amplifier in-phase input end connection second resistance string and
Second diode；Also include second resistance (R31, R62, R89) in parallel and the second electric capacity (C10, C19, C28), described second
One end ground connection of resistance and the second electric capacity, the other end is connected with first operational amplifier；Described second resistance string one end with
The second diode input is connected, and other end connection phase-shifting transformer is auxiliary around side phase voltage output end；First computing
Amplifier inverting input connects first resistor string and the first diode；Also include first resistor (R15, R44, R78) in parallel
The first operational amplifier output is connected with the other end of the first electric capacity (C4, C11, C21), and second resistance and the second electric capacity
End；Described first resistor string one end is connected with the first diode input, and other end connection phase-shifting transformer is auxiliary around side phase
Zero line output end.
7. middle high-pressure RHVC voltage detecting circuit as claimed in claim 1, it is characterised in that：First electricity
Pressure follow circuit include the second operational amplifier (U2B, U3B, U5B), 3rd resistor (R19, R47, R74) and the 3rd electric capacity (C8,
C16、C23)；The second operational amplifier inverting input connects second operational amplifier output terminal and 3rd resistor；
The 3rd resistor other end is connected with the 3rd electric capacity, the 3rd electric capacity other end ground connection；The second operational amplifier in-phase input end
Connect first operational amplifier output terminal.
8. middle high-pressure RHVC voltage detecting circuit as claimed in claim 1, it is characterised in that：It is described it is anti-phase plus
Method circuit includes the 3rd operational amplifier (U1A, U4A, U6A), 3rd resistor string (R1, R2；R39、R40；R75, R76), the 4th
Resistance string (R16, R50, R90), the 4th resistance (R3, R45, R77), the 5th resistance (R18, R57, R92), the 6th resistance (R20,
R61, R93), the 4th electric capacity (C1, C12, C25) and the 5th electric capacity (C6, C18, C29)；3rd operational amplifier is with mutually defeated
Enter the 6th resistance of end connection, the 6th resistance other end ground connection；The 3rd operational amplifier inverting input connection the 4th
Resistance string, 3rd resistor string, the 4th resistance and the 4th electric capacity, the 4th resistance are in parallel with the 4th electric capacity, and the 4th resistance and the 4th
The electric capacity other end connects the 3rd operational amplifier output terminal and the 5th resistance；The electricity of 5th resistance other end connection the 5th
Hold, the 5th electric capacity other end ground connection；The other end connection 3rd resistor of the 4th resistance string, the 3rd resistor other end and described second
The output end of operation amplifier electrical equipment is connected；The other end of 3rd resistor string is connected with reference phase voltage.
9. middle high-pressure RHVC voltage detecting circuit as claimed in claim 1, it is characterised in that：Second electricity
Pressure follow circuit include four-operational amplifier (U1B, U4B, U5B), the 7th resistance (R4, R46, R80), the 8th resistance (R17,
R51, R91), the 6th electric capacity (C2, C14, C26) and the 3rd diode (D2, D5, D9)；The four-operational amplifier is anti-phase defeated
Enter end connection the 7th resistance and the 6th electric capacity, the 7th resistance is in parallel with the 6th electric capacity, and the 7th resistance and the 6th electric capacity other end connect
Connect the four-operational amplifier output end and the 8th resistance；The 8th resistance other end connects the 3rd diode and DSP master control cores
Piece AD sampling pins；The four-operational amplifier in-phase input end connects the 5th resistance and the 5th electric capacity.
10. a kind of middle high-pressure RHVC input voltage measurement method, it is characterised in that comprise the following steps：
S1, using band assists winding phase-shifting transformer by input side high-voltage variable be 380V voltage signals；
S2, -5V~+5V ac voltage signals are converted into using differential amplifier circuit by the 380V voltage signals, and by electricity
Pressure follows circuit output to anti-phase add circuit；
, with reference voltage value be added the -5V~+5V ac voltage signals using anti-phase add circuit by S3, makes -5V~+5V
AC signal is converted into 0~+3V DC voltage detection signals, then by delivering to DSP master after voltage follower circuit and filtering process
On control chip AD sampling pins；
S4, DSP main control chip compare the DC voltage detection signal of collection and default normal value, such as in normal range (NR)
It is interior, then attonity；Such as exceed normal range (NR), then send alarm signal to RHVC control end.
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| CN109606196A (en) * | 2019-01-18 | 2019-04-12 | 四川瑞可达连接***有限公司 | A kind of electric car charging gun with function of temperature control |
| CN109861175A (en) * | 2019-01-31 | 2019-06-07 | 大禹电气科技股份有限公司 | A kind of voltage sample and protection circuit of power cell |
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| CN109606196B (en) * | 2019-01-18 | 2023-11-17 | 四川瑞可达连接***有限公司 | Electric automobile rifle that charges of area control by temperature change function |
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