CN109546625A - 380VAC protects circuit and charger and application method - Google Patents
380VAC protects circuit and charger and application method Download PDFInfo
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- CN109546625A CN109546625A CN201811491403.5A CN201811491403A CN109546625A CN 109546625 A CN109546625 A CN 109546625A CN 201811491403 A CN201811491403 A CN 201811491403A CN 109546625 A CN109546625 A CN 109546625A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 37
- 238000006243 chemical reaction Methods 0.000 claims description 33
- 238000001914 filtration Methods 0.000 claims description 22
- 238000005070 sampling Methods 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 14
- 239000000919 ceramic Substances 0.000 claims description 9
- 230000006837 decompression Effects 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 8
- 238000013519 translation Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/042—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage comprising means to limit the absorbed power or indicate damaged over-voltage protection device
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging current or voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention relates to power electronics fields; specifically a kind of reliable operation, highly-safe, 380VAC protection circuit and charger of reasonable cost and application method; it is characterized in that, being equipped with input lightning protection circuit, input power supply interlock circuit, input filter rectification circuit, high pressure auxiliary power circuit, high tension voltage sample circuit；Wherein input lightning protection circuit is set to the front end of input power supply interlock circuit, the rear end of input power supply interlock circuit connects input rectifying filter circuit, the electrical signal of high pressure auxiliary power circuit connects between input lightning protection circuit and input power supply interlock circuit, the sampled signal input of high tension voltage sample circuit connects in the front end of input power supply interlock circuit, pass through the implementation of this programme, expand the scope of application of product, trouble free service performance of the product under complex working condition is improved, product market can be effectively reduced and return the rate of moving back.
Description
Technical field:
It is specifically a kind of reliable operation, highly-safe, of reasonable cost the present invention relates to power electronics field
380VAC protects circuit and charger and application method.
Background technique:
It is powered currently, the Switching Power Supply product of middle low power is substantially using single-phase 220VAC.In device application aspect,
The pressure resistance of the device of input stage exchange side is chosen according to 300VAC；On design protection, generally in input stage firewire or zero
Protective tube is concatenated on line.The probability that this circuit design goes wrong under normal usage is lower, but some special
Industrial application scene, scene exist simultaneously single-phase and three-phase power line, and live user is easy to for three-phase electricity being linked into fill
Motor product, this results in the failure damage of charger product.
Summary of the invention:
The present invention is to shortcoming and defect existing in the prior art, when proposing a kind of 380VAC power supply for access
380VAC protects circuit and charger and its application.
The present invention can reach by the following technical programs:
A kind of 380VAC protection circuit, which is characterized in that be equipped with input lightning protection circuit, input power supply interlock circuit, input
Filter rectifier, high pressure auxiliary power circuit, high tension voltage sample circuit；Wherein input lightning protection circuit is set to input power supply
The rear end of the front end of interlock circuit, input power supply interlock circuit connects input rectifying filter circuit, high pressure auxiliary power circuit
Electrical signal connects between input lightning protection circuit and input power supply interlock circuit, the sampled signal of high tension voltage sample circuit
Input terminates at the front end of input power supply interlock circuit,
The input lightning protection circuit is equipped with the first varistor MOV1, the second varistor MOV2 and third varistor
MOV3, wherein between the first varistor MOV1 access input power supply zero curve and firewire, the second varistor MOV2 access input
It powers between firewire and ground wire, between third varistor MOV3 access input power supply zero curve and ground wire；
The input power supply interlock circuit is equipped with the first relay K1, the second relay K2, the first temperature-sensitive NTC resistance RT1
With the second temperature-sensitive NTC resistance RT2, wherein the normally opened contact of the first relay K1 is series on supply input firewire；Soft start group
It connects after part is connected by the first temperature-sensitive NTC resistance RT1, the second temperature-sensitive NTC resistance RT2 with the normally opened contact of the second relay K2；
Soft start component is in parallel with the first relay K1；
The input filter rectification circuit is located at after input power supply interlock circuit；Input filter rectification circuit includes first
X capacitor C1, the first Y capacitance C2, the second Y capacitance C3, input common mode inductance and input rectifying bridge；First X capacitor C1 is connected to LN line
Between, the first Y capacitance C2 and the second Y capacitance C3 are located at after the first X capacitor C1, and the first Y capacitance C2 access firewire with
Between ground wire, the second Y capacitance C3 is accessed between zero curve and ground wire, is terminated at the first Y capacitance C2, the 2nd Y before inputting common mode inductance
After capacitor C3, input rectifying bridge is terminated after inputting common mode inductance；
The high pressure auxiliary power circuit is equipped with crossfeed component, equalization filtering component and accessory power supply power conversion group
Part；The crossfeed component includes the first filter inductance L1, diode D1, diode D2, diode D3, diode D4, two
Pole pipe D5, diode D6, wherein one end of the first filter inductance L1 is connected to the second temperature-sensitive NTC electricity in input power supply interlock circuit
It hindering on the node between RT2 and the second relay K2, the other end of the first filter inductance L1 is connected to the anode of diode D1, and two
The anode of the cathode connection diode D2 of pole pipe D1, the anode of the cathode connection diode 3 of diode D2, the cathode of diode D3
The anode of diode D4 is connected, the cathode of third diode D3 is connected to the anode of the 4th diode D4；5th diode D5's
Anode is connected to PFC boost circuit anode bus, and the cathode of the 5th diode D5 is connected to the anode of the 6th diode D6, and the 4th
The cathode of diode D4 is connected with the cathode of the 6th diode D6, and is connected on equalization filtering component inputs；
The equalization filtering component includes equalizing resistance R1, equalizing resistance R2, equalizing resistance R3, equalizing resistance R4, first
Electrolytic capacitor filter C1, the second electrolytic capacitor filter C2 and the first filtering ceramic disc capacitor C3, one end of the first equalizing resistance R1, the
The anode of one electrolytic capacitor filter C1 is connected with one end of the first filtering ceramic disc capacitor C3, the input as equalization filtering component
End, equalizing resistance R1, equalizing resistance R2, equalizing resistance R3, equalizing resistance R4 series connection, the other end of equalizing resistance R4, the second filter
The other end of the cathode of wave electrolytic capacitor C2 and the first ceramic disc capacitor C3 are connected, and are then attached to PFC boost circuit negative electrode bus,
The cathode and the second filtering electrolysis electricity of the tie point of the equalizing resistance R2 and equalizing resistance R3 and the first electrolytic capacitor filter C1
The cathode for holding C2 is connected.
Accessory power supply power conversion component of the present invention is that Multiple coil exports inverse-excitation type switch power-supply, and the design of this power supply is pressed
Meet under high-pressure situations according to exchange input 530Vac design, the normal work of this power supply.
High tension voltage sample circuit of the present invention includes AC rectification component, decompression average value component and isolation set of samples
Part；The AC rectification component includes rectifier diode D7, rectifier diode D8, rectifier diode D9, rectifier diode D10,
Wherein the anode of rectifier diode D9 is connected on input N line, and the cathode of rectifier diode D9 is connected to rectifier diode D10's
Anode, the anode of rectifier diode D7 are connected to the anode tie point of the first filter inductance L1 Yu diode D1, rectifier diode
D7 cathode is connected to rectifier diode D8 anode, and rectifier diode D10 cathode is connected to rectifier diode D8 cathode, then connects
To decompression average value component inputs；
The decompression average value component includes six dropping resistor R9, R10, R11, R12, R13, R14, four isopotential electricals
R5, R6, R7, R8, the first average value capacitor C4 are hindered, six dropping resistors are sequentially connected in series,
The junction of the other end connection diode D10 cathode and diode D8 cathode of dropping resistor R9, dropping resistor R14
The other end ground connection；Four equipotential resistance are sequentially connected in series, and the front end of resistance R5 and the front end of dropping resistor R9 are connected to two simultaneously
The tie point of pole pipe D10 cathode and diode D8 cathode terminates on the cathode ground wire of PFC bus after resistance R8；First is flat
Mean value capacitor C4 is parallel to the both ends dropping resistor R14；
The isolation sampling component includes triangle wave generating circuit, voltage comparator circuit, light-coupled isolation transmission circuit and MCU
Sample circuit, wherein the output end of triangle wave generating circuit is connected with the input terminal all the way of voltage comparator circuit, and decompression is average
The output end of component is connected with the another way input terminal of voltage comparator circuit, and the output end of voltage comparator circuit and light-coupled isolation pass
The input terminal on transmission of electricity road is connected, and the output end of light-coupled isolation transmission circuit is connected with MCU sample circuit, MCU sample circuit and control
Unit processed is connected.
As above scheme as it can be seen that scheme described in this case the voltage of ac input end mouth can be carried out it is effective electrically every
From, while voltage value is accurately sampled.
A kind of charger, which is characterized in that single equipped with above-mentioned 380VAC protection circuit, ac-dc conversion circuit and control
Member, wherein 380VAC protects the rear end of the input rectifying filter circuit in circuit to connect ac-dc conversion circuit, control unit point
With ac-dc conversion circuit and 380VAC protection circuit in high pressure auxiliary power circuit, high tension voltage sample circuit phase
Even.
380VAC protection circuit of the present invention is circuit or its flexible circuit in above scheme.
Ac-dc conversion circuit of the present invention includes: PFC active power factor translation circuit, for provide outside
Electric main is transformed to high voltage bus direct current, while improving the power factor of complete machine；DC/DC translation circuit, for realizing straight
High voltage bus DC power conversion is level voltage required for battery charges by the transformation of galvanic electricity pressure.
Control unit of the present invention includes: main control MCU unit, for the realization of complete machine control algolithm, is worked complete machine
The control of sequential logic and the response of protection act；Interior lamp driving circuit, for receiving the control of main control MCU unit output
Signal processed carries out driving to indicator light on charger ontology and shows；External drive circuit of indicator, for receiving main control MCU list
The control signal of member output, carries out driving to the indicator light outside charger and shows；
First temperature sampling circuit, the sampling for charger product internal temperature；
Second temperature sample circuit, the sampling for charger product ambient temperature；
First driving circuit, the driving for the first relay in the input power supply interlock circuit；
Second driving circuit, the driving for the second relay in the input power supply interlock circuit；
Third driving circuit, the driving for output relay in the ac-dc conversion circuit.
It is described by above scheme as it can be seen that when inputting supply voltage within the scope of charger product normal working voltage
380VAC protects circuit not execute movement, by ac-dc conversion circuit, provides power grid to Alternating Current Power Supply and is converted to power battery
Direct current supply required for charging.The power supply power supply system for accessing mistake, when causing system voltage excessively high, 380VAC protects circuit
Protection act is carried out, ac-dc conversion circuit is protected in isolation high-voltage fence power supply.
A kind of application method of charger, it is characterised in that the following steps are included:
Step 1: described control unit is powered by high pressure auxiliary power circuit, guarantees it in any supply voltage
It can work normally；
Step 2: described control unit is by the high tension voltage sampling circuit samples supply voltage, in order to guarantee that sampling is handed over
The precision for flowing supply voltage carries out the calibration of inner curve, the implementation method of this algorithm using least square linear fit algorithm
Are as follows:
Formula form to be calibrated are as follows:
Usamp=U0(1+aUac)
Practical n times test UsampAnd Uac, it is denoted as U respectivelysampiAnd Uaci, i=1,2 ..., N.
Enable U0=a, cU0=b is two parameters to be estimated, then mode error is writeable are as follows:
vi=Usampi-(a+UaciB) (i=1,2 ..., N)
According to error equation, normal equation is listed:
The alternating voltage numerical value to be calibrated for bringing test into, can be obtained coefficient a, b, c and U0。
After detecting input AC supply voltage, when input supply voltage Uac is in charger product normal working voltage model
In enclosing when i.e. Uac < 280V, control unit unit issues control instruction, the second relay K2 in driving input power supply interlock circuit
Movement closure, by input filter rectification circuit to soft the opening of PFC active power factor translation circuit in ac-dc conversion circuit
Dynamic charging；After delay 1 second, control unit issues control instruction, the first relay K1 movement in driving input power supply interlock circuit
Closure provides energy to ac-dc conversion circuit by input filter rectification circuit；When input supply voltage is not produced in charger
When within the scope of product normal working voltage, control unit issues control instruction, does not drive the first relay in input power supply interlock circuit
Device K1 and the second relay K2 movement, then be isolated Outer risks voltage and ac-dc conversion circuit, to ac-dc conversion at this time
Circuit can play absolute protective effect, while export alarm alert signal outward, and wait AC-input voltage normal.
By above scheme as it can be seen that by the implementation of least-squares algorithm, it is sufficiently used the setoff effect of error, it can be with
The influence of random error is effectively reduced, thus is fitted acquired results most trustworthiness.The implementation of this algorithm utilizes, effectively
Ground ensure that the precision of isolation AC sampling voltage, provide believable data supporting for the logic judgment of control unit.Control
Unit by logic judgment, having blocked that Keep Clear-High Voltage, circuit enters main power circuit part, and the implementation for passing through this scheme provides
A kind of safe and reliable 380vac harmonics circuit.
Charger of the present invention when in use, adopted by the first temperature sampling circuit and second temperature by described control unit
Sample circuit acquires charger interior environment temperature and charger product ambient temperature；Control unit is according to the environment temperature of acquisition
Degree, carries out the calibration of charging curve；The algorithm of calibration are as follows: on the basis of 20 DEG C, 1 DEG C of the every increase/decrease of environment temperature, charger
Output voltage, which is normalized to single branch battery, reduces or increases 4mV or 3mV；Control unit is according to calibrated charging curve control
The direct current output for making the ac-dc conversion circuit reaches the point of voltage and current required for being electrically charged battery.
By above scheme as it can be seen that passing through the implementation of this programme application method, by the reality for realizing linear fit control algolithm
It applies, improves the sampling precision and the linearity of alternating supply voltage.By described control unit according to input supply voltage state,
The movement of two relays, can effectively realize input supply voltage and ac-dc conversion circuit electricity in control input interlock circuit
Physical isolation on gas route reaches determining protective effect.Control unit can be given by high pressure auxiliary power circuit simultaneously
Safe power supply guarantees under any voltage status, can provide power supply for control unit circuit.By charging described in this programme
The implementation of machine application method, it is ensured that charging curve meets charging requirement of the battery at any temperature, avoid overcharge with
The generation of charge less electrical phenomena.
By the implementation of this programme, the scope of application of product is expanded, improves safe work of the product under complex working condition
Make performance, product market can be effectively reduced and return the rate of moving back.
Detailed description of the invention:
Attached drawing 1 is structural block diagram of the invention.
Attached drawing 2 is the circuit diagram of 380VAC protection circuit of the present invention.
Attached drawing 3 is the work flow diagram that 380VAC protects circuit in the present invention.
Attached drawing 4 is control logic schematic diagram of the present invention.
Attached drawing 5 is the first charger charging curve.
Attached drawing 6 is second of charger charging curve.
Appended drawing reference: 1 input lightning protection circuit；2 input power supply interlock circuits；3 high pressure auxiliary power circuits；4 high tension voltages
Sample circuit；5 input filter rectification circuits.
Specific embodiment:
Referring to Fig. 2,380VAC protection circuit proposed by the present invention includes: input lightning protection circuit 1, input power supply interlock circuit
2, high pressure auxiliary power circuit 3, high tension voltage sample circuit 4 and input filter rectification circuit 5；Input 1 parallel connection of lightning protection circuit is put
It is placed in input power port, input power supply interlock circuit 2 is series on power supply L line；The input and confession of high pressure auxiliary circuit circuit 3
Electric L line is connected with the DC bus after PFC boost；Direct current after high tension voltage sample circuit 4 and input LN line and PFC boost is female
The ground wire of line is connected.
First varistor MOV1 is parallel between input power supply LN line in input lightning protection circuit 1, the second varistor
MOV2 is parallel between input power supply L line and Earth line, third varistor MOV3 parallel connection and input power supply N line and Earth line
Between.
The normally opened contact of first relay K1 is series on input L line in power supply interlock circuit 2；First temperature-sensitive NTC resistance
The normally opened contact series connection of RT1, the second temperature-sensitive NTC resistance RT2 series connection and the second relay K2, constitutes soft start component；Soft start
Component is in parallel with the first relay K1.
Input filter rectification circuit 5 is located at after input power supply interlock circuit；First X capacitor C1 is parallel between LN line；
Before first Y capacitance C1 is parallel to LN line after connecting with the second Y capacitance C2, the first Y capacitance C1 and the second concatenated section of Y capacitance C2
Point is connected to grounding point Earth.
The crossfeed component of high pressure accessory power supply 3 includes the first filter inductance L1, the first to the 6th diode D1-
D6.One end of first filter inductance L1 is connected to the second temperature-sensitive NTC resistance RT2 and the second relay in input power supply interlock circuit
On the concatenated node of K2, the other end of the first filter inductance L1 is connected to the anode of first diode D1, first diode D1's
Cathode is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the anode of third diode D3, third
The cathode of diode D3 is connected to the anode of the 4th diode D4；The anode of 5th diode D5 is being connected to PFC boost circuit just
The cathode of pole bus, the 5th diode D5 is connected to the anode of the 6th diode D6；The cathode and the six or two of 4th diode D4
The cathode of pole pipe D6 is connected, and is connected on equalization filtering component inputs.
The equalization filtering component of high pressure accessory power supply 3 includes first to fourth equalizing resistance R1-R4, the first filtering electrolysis electricity
Hold C1, the second electrolytic capacitor filter C2 and the first filtering ceramic disc capacitor C3.One end R1 of first equalizing resistance, the first filtering electrolysis
The anode of capacitor C1 is connected with one end of the first filtering ceramic disc capacitor C3, the input terminal as equalization filtering component.4th presses
One end of one end of resistance R4, the cathode of the second electrolytic capacitor filter C2 and the first ceramic disc capacitor C3 is connected, and is then attached to PFC
Booster circuit negative electrode bus.The tie point and the first electrolytic capacitor filter of the second equalizing resistance R2 and third equalizing resistance R3
The cathode of the cathode of C1 and the second electrolytic capacitor filter C2 are connected.
The accessory power supply power conversion component of high pressure accessory power supply 3 is that Multiple coil exports inverse-excitation type switch power-supply.This
Power supply design meets under high-pressure situations according to exchange input 530Vac design, this power supply works normally.
The AC rectification component of high tension voltage sample circuit 4 includes the 7th to the tenth rectifier diode D7-D10.7th is whole
Stream diode D7 anode is connected on input N line, and the 7th rectifier diode D7 cathode is connected to the 8th rectifier diode D8 anode.
9th rectifier diode D9 anode is connected to the first filter inductance L1 and first diode D1 anode tie point, the 9th two poles of rectification
Pipe D9 cathode is connected to the tenth rectifier diode D10 anode, and the tenth rectifier diode D10 cathode is connected to the 8th rectifier diode
D8 cathode is then attached to decompression average value component inputs.
The decompression average value component of high tension voltage sample circuit 4 includes the first to the 6th dropping resistor R9-R14, first flat
Mean value capacitor C4 and first to fourth equipotential resistance (R5-R8).First dropping resistor is suitable to the 6th dropping resistor (R9-R14)
Sequence series connection, wherein one end of the first dropping resistor R9 is connected to the tenth rectifier diode D10 cathode and the 8th rectifier diode D8
At the node of cathode connection, one end of the 6th dropping resistor R14 is connected on the cathode ground wire of PFC bus；First average value electricity
Hold C4 and is parallel to the upper of the 6th dropping resistor R14.First to fourth equipotential resistance (R5-R8) sequence is connected, wherein first etc.
One end of current potential resistance R5 is connected to the node that the tenth rectifier diode D10 cathode is connect with the 8th rectifier diode D8 cathode
Place, one end of the 4th equipotential resistance R8 is connected on the cathode ground wire of PFC bus.
Isolation sampling component includes triangle wave generating circuit, voltage comparator circuit, optocoupler described in high tension voltage sample circuit 4
Isolation and transmission circuit and MCU sample circuit.
Referring to Figure 1 and Figure 3, the control method of 380Vac protection charger is illustrated.
The control method of 380Vac protection charger:
Control unit includes MCU singlechip controller, is powered by high pressure auxiliary power circuit 3, guarantees it any
It can be worked normally in the case of supply voltage.
Control unit is by 4 Sample AC mains-supplied voltage of high tension voltage sample circuit, when input power supply line voltage
When within the scope of charger product normal working voltage, the main control MCU unit in control unit issues control instruction, passes through second
Driving circuit driving inputs the second relay K2 movement closure in power supply interlock circuit 2, by input filter rectification circuit 5 to friendship
The soft start charging of PFC active power factor translation circuit in DC transfer circuit.As shown in figure 3, after delay 1 second, main control MCU
Unit issues control instruction, drives the first relay K1 movement closure in input power supply interlock circuit 2 by the first driving circuit,
Energy is provided to ac-dc conversion circuit by input filter rectification circuit 5.
Control unit samples supply voltage by high tension voltage sample circuit 4, when input supply voltage is not produced in charger
When within the scope of product normal working voltage, the main control MCU unit in control unit issues control instruction, does not drive input power supply interlocking
Outer risks voltage and ac-dc conversion electricity has then been isolated in first relay K1 and the second relay K2 movement in circuit 5 at this time
Road can play absolute protective effect to ac-dc conversion circuit.
Control unit samples supply voltage by the high tension voltage sample circuit 4, and main control MCU unit is according to sampling
External voltage drives the indicator light outside charger by external drive circuit of indicator；
Circuit through the foregoing embodiment controls defeated it is found that by described control unit according to input supply voltage state
Enter the movement of two relays in interlock circuit, can effectively realize input supply voltage and ac-dc conversion circuit electric wiring
On physical isolation, reach determining protective effect.It can be supplied safely to control unit by high pressure auxiliary power circuit simultaneously
Electricity guarantees under any voltage status, can provide power supply for control unit circuit.
Claims (8)
1. a kind of 380VAC protects circuit, which is characterized in that be equipped with input lightning protection circuit, input power supply interlock circuit, input filter
Wave rectification circuit, high pressure auxiliary power circuit, high tension voltage sample circuit；Wherein it is mutual to be set to input power supply for input lightning protection circuit
The rear end of the front end of lock circuit, input power supply interlock circuit connects input rectifying filter circuit, the electricity of high pressure auxiliary power circuit
Signal output end connects between input lightning protection circuit and input power supply interlock circuit, and the sampled signal of high tension voltage sample circuit is defeated
Enter to terminate at the front end of input power supply interlock circuit, the input lightning protection circuit is equipped with the first varistor MOV1, second pressure-sensitive
Resistance MOV2 and third varistor MOV3, wherein between the first varistor MOV1 access input power supply zero curve and firewire, the
Between two varistor MOV2 access input power supply firewire and ground wire, third varistor MOV3 access input power supply zero curve and ground
Between line；
Input power supply interlock circuit is equipped with the first relay K1, the second relay K2, the first temperature-sensitive NTC resistance RT1 and the
Two temperature-sensitive NTC resistance RT2, wherein the normally opened contact of the first relay K1 is series on supply input firewire；Soft start component by
It connects after first temperature-sensitive NTC resistance RT1, the second temperature-sensitive NTC resistance RT2 series connection with the normally opened contact of the second relay K2；It is soft to open
Dynamic component is in parallel with the first relay K1；
The input filter rectification circuit is located at after input power supply interlock circuit；Input filter rectification circuit includes the first X electricity
Hold C1, the first Y capacitance C2, the second Y capacitance C3, input common mode inductance and input rectifying bridge；First X capacitor C1 be connected to LN line it
Between, the first Y capacitance C2 and the second Y capacitance C3 are located at after the first X capacitor C1, and the first Y capacitance C2 access firewire and ground
Between line, the second Y capacitance C3 is accessed between zero curve and ground wire, is terminated at the first Y capacitance C2, the 2nd Y electricity before inputting common mode inductance
After holding C3, input rectifying bridge is terminated after inputting common mode inductance；
The high pressure auxiliary power circuit is equipped with crossfeed component, equalization filtering component and accessory power supply power conversion component；
The crossfeed component includes the first filter inductance L1, diode D1, diode D2, diode D3, diode D4, diode
D5, diode D6, wherein one end of the first filter inductance L1 is connected to the second temperature-sensitive NTC resistance in input power supply interlock circuit
On node between RT2 and the second relay K2, the other end of the first filter inductance L1 is connected to the anode of diode D1, two poles
The anode of the cathode connection diode D2 of pipe D1, the anode of the cathode connection diode 3 of diode D2, the cathode of diode D3 connect
The anode of diode D4 is connect, the cathode of third diode D3 is connected to the anode of the 4th diode D4；The sun of 5th diode D5
Pole is connected to PFC boost circuit anode bus, and the cathode of the 5th diode D5 is connected to the anode of the 6th diode D6, and the four or two
The cathode of pole pipe D4 is connected with the cathode of the 6th diode D6, and is connected on equalization filtering component inputs；
The equalization filtering component includes equalizing resistance R1, equalizing resistance R2, equalizing resistance R3, equalizing resistance R4, the first filtering
Electrolytic capacitor C1, the second electrolytic capacitor filter C2 and the first filtering ceramic disc capacitor C3, one end of the first equalizing resistance R1, the first filter
The anode of wave electrolytic capacitor C1 is connected with one end of the first filtering ceramic disc capacitor C3, as the input terminal of equalization filtering component,
Piezoresistance R1, equalizing resistance R2, equalizing resistance R3, equalizing resistance R4 series connection, the other end of equalizing resistance R4, the second filtering electrolysis
The other end of the cathode of capacitor C2 and the first ceramic disc capacitor C3 are connected, and are then attached to PFC boost circuit negative electrode bus, described equal
The cathode and the second electrolytic capacitor filter C2 of the tie point of piezoresistance R2 and equalizing resistance R3 and the first electrolytic capacitor filter C1
Cathode is connected.
2. a kind of 380VAC according to claim 1 protects circuit, which is characterized in that the accessory power supply power conversion group
Part is that Multiple coil exports inverse-excitation type switch power-supply, and the design of this power supply meets under high-pressure situations according to exchange input 530Vac design,
The normal work of this power supply.
3. a kind of 380VAC according to claim 1 protects circuit, which is characterized in that the high tension voltage sample circuit packet
Include AC rectification component, decompression average value component and isolation sampling component；The AC rectification component include rectifier diode D7,
Rectifier diode D8, rectifier diode D9, rectifier diode D10, wherein the anode of rectifier diode D9 is connected to input N line
On, the cathode of rectifier diode D9 is connected to the anode of rectifier diode D10, and the anode of rectifier diode D7 is connected to the first filter
The anode tie point of wave inductance L1 and diode D1, rectifier diode D7 cathode are connected to rectifier diode D8 anode, rectification two
Pole pipe D10 cathode is connected to rectifier diode D8 cathode, is then attached to decompression average value component inputs；
The decompression average value component includes six dropping resistor R9, R10, R11, R12, R13, R14, four equipotential resistance
R5, R6, R7, R8, the first average value capacitor C4, six dropping resistors are sequentially connected in series, and the other end of dropping resistor R9 connects two poles
The junction of pipe D10 cathode and diode D8 cathode, the other end ground connection of dropping resistor R14；Four equipotential resistance are successively gone here and there
Connection, the front end of resistance R5 and the front end of dropping resistor R9 are connected to the tie point of diode D10 cathode and diode D8 cathode simultaneously,
It is terminated at after resistance R8 on the cathode ground wire of PFC bus；First average value capacitor C4 is parallel to the both ends dropping resistor R14；Institute
Stating isolation sampling component includes triangle wave generating circuit, voltage comparator circuit, light-coupled isolation transmission circuit and MCU sample circuit,
Wherein the output end of triangle wave generating circuit is connected with the input terminal all the way of voltage comparator circuit, is depressured the output of average component
End is connected with the another way input terminal of voltage comparator circuit, and the output end of voltage comparator circuit is defeated with light-coupled isolation transmission circuit
Enter end to be connected, the output end of light-coupled isolation transmission circuit is connected with MCU sample circuit, and MCU sample circuit is connected with control unit
It connects.
4. a kind of charger, which is characterized in that equipped with as described in any one of claim 1-3 380VAC protection circuit,
Ac-dc conversion circuit and control unit, wherein 380VAC protects the rear end connection of the input rectifying filter circuit in circuit to hand over straight
Translation circuit is flowed, control unit is electric with the high pressure accessory power supply in ac-dc conversion circuit and 380VAC protection circuit respectively
Road, high tension voltage sample circuit are connected.
5. a kind of charger according to claim 4, it is characterised in that the ac-dc conversion circuit includes: PFC active
Power factor translation circuit, the electric main for providing outside is transformed to high voltage bus direct current, while improving complete machine
Power factor；High voltage bus DC power conversion is battery charging for realizing the transformation of DC voltage by DC/DC translation circuit
Required level voltage.
6. a kind of charger according to claim 4, it is characterised in that described control unit includes: main control MCU unit, is used
In the realization of complete machine control algolithm, the response of control and protection act to complete machine working sequence logic；Interior lamp driving
Circuit carries out driving to indicator light on charger ontology and shows for receiving the control signal of main control MCU unit output；It is external
Drive circuit of indicator drives the indicator light outside charger for receiving the control signal of main control MCU unit output
Display；
First temperature sampling circuit, the sampling for charger product internal temperature；
Second temperature sample circuit, the sampling for charger product ambient temperature；
First driving circuit, the driving for the first relay in the input power supply interlock circuit；
Second driving circuit, the driving for the second relay in the input power supply interlock circuit；
Third driving circuit, the driving for output relay in the ac-dc conversion circuit.
7. a kind of application method of the charger as described in any one of claim 4-6, it is characterised in that including following step
It is rapid:
Step 1: control unit is powered by high pressure auxiliary power circuit, guarantees that it can be just in any supply voltage
Often work；
Step 2: described control unit is by the high tension voltage sampling circuit samples supply voltage, in order to guarantee that Sample AC supplies
The precision of piezoelectric voltage carries out the calibration of inner curve, the implementation method of this algorithm using least square linear fit algorithm are as follows: to
The formula form of calibration are as follows:
Usamp=U0(1+aUac)
Practical n times test UsampAnd Uac, it is denoted as U respectivelysampiAnd Uaci, i=1,2 ..., N.
Enable U0=a, cU0=b is two parameters to be estimated, then mode error is writeable are as follows:
vi=Usampi-(a+UaciB) (i=1,2 ..., N)
According to error equation, normal equation is listed:
The alternating voltage numerical value to be calibrated for bringing test into, can be obtained coefficient a, b, c and U0；
After detecting input AC supply voltage, when input supply voltage Uac is within the scope of charger product normal working voltage
That is when Uac < 280V, control unit unit issues control instruction, the second relay K2 movement in driving input power supply interlock circuit
Closure, the soft start by input filter rectification circuit to PFC active power factor translation circuit in ac-dc conversion circuit fill
Electricity；After delay 1 second, control unit issues control instruction, and driving inputs the first relay K1 movement closure in power supply interlock circuit,
Energy is provided to ac-dc conversion circuit by input filter rectification circuit；When input supply voltage is normal not in charger product
When in operating voltage range, control unit issue control instruction, do not drive input power supply interlock circuit in the first relay K1 and
Second relay K2 movement, then be isolated Outer risks voltage and ac-dc conversion circuit at this time, can to ac-dc conversion circuit
To play absolute protective effect, while alarm alert signal is exported outward, and wait AC-input voltage normal.
8. a kind of application method of charger according to claim 7, it is characterised in that further include: the charger makes
Used time, described control unit acquire charger interior environment temperature by the first temperature sampling circuit and second temperature sample circuit
With charger product ambient temperature；Control unit carries out the calibration of charging curve according to the environment temperature of acquisition；Calibration
Algorithm are as follows: on the basis of 20 DEG C, 1 DEG C of the every increase/decrease of environment temperature, charger output voltage, which is normalized to single branch battery, to be reduced
Either increase 4mV or 3mV；Control unit is defeated according to the direct current that calibrated charging curve controls the ac-dc conversion circuit
Out, reach the point of voltage and current required for being electrically charged battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811491403.5A CN109546625A (en) | 2018-12-07 | 2018-12-07 | 380VAC protects circuit and charger and application method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811491403.5A CN109546625A (en) | 2018-12-07 | 2018-12-07 | 380VAC protects circuit and charger and application method |
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|---|---|---|---|---|
| JP2003348749A (en) * | 2002-05-30 | 2003-12-05 | Nippon Telegraph & Telephone East Corp | Lightning-preventing adapter for power source line |
| WO2006072216A1 (en) * | 2005-01-08 | 2006-07-13 | Emerson Network Power Energy Systems Ab | A switching power supply with overvoltage protection and its overvoltage protection method |
| CN201774717U (en) * | 2010-08-26 | 2011-03-23 | 佛山市顺德区瑞德电子实业有限公司 | SCR resonance half-bridge based LED streetlamp drive power circuit |
| CN104979893A (en) * | 2015-07-06 | 2015-10-14 | 衢州市沃思电子技术有限公司 | Standby power supply of electronic equipment |
| CN209250229U (en) * | 2018-12-07 | 2019-08-13 | 威海天力电源有限公司 | 380VAC protects circuit and charger |
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2018
- 2018-12-07 CN CN201811491403.5A patent/CN109546625A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003348749A (en) * | 2002-05-30 | 2003-12-05 | Nippon Telegraph & Telephone East Corp | Lightning-preventing adapter for power source line |
| WO2006072216A1 (en) * | 2005-01-08 | 2006-07-13 | Emerson Network Power Energy Systems Ab | A switching power supply with overvoltage protection and its overvoltage protection method |
| CN201774717U (en) * | 2010-08-26 | 2011-03-23 | 佛山市顺德区瑞德电子实业有限公司 | SCR resonance half-bridge based LED streetlamp drive power circuit |
| CN104979893A (en) * | 2015-07-06 | 2015-10-14 | 衢州市沃思电子技术有限公司 | Standby power supply of electronic equipment |
| CN209250229U (en) * | 2018-12-07 | 2019-08-13 | 威海天力电源有限公司 | 380VAC protects circuit and charger |
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