CN108599543A - Power source charges control circuit and power source charges control method - Google Patents
Power source charges control circuit and power source charges control method Download PDFInfo
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- CN108599543A CN108599543A CN201810345928.1A CN201810345928A CN108599543A CN 108599543 A CN108599543 A CN 108599543A CN 201810345928 A CN201810345928 A CN 201810345928A CN 108599543 A CN108599543 A CN 108599543A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The present invention provides a kind of power source charges control circuit and power source charges control methods,It is charged electrolytic capacitor to constitute charge circuit by exporting direct current by the rectified module of AC power,And by being connected on above-mentioned charge circuit after several current limliting wired in parallel are arranged,Several above-mentioned current limliting module timesharing are controlled individually by MCU when powering on or several conductings are to charge to the electrolytic capacitor,The present embodiment is since by controlling, several current limliting module timesharing are single or multiple conductings,So that the resistance value of the current-limiting resistance in charge circuit is different in time-sharing charging,And the current-limiting resistance resistance value to charge first is greatly to inhibit surge,The current-limiting resistance resistance value to charge afterwards is small to accelerate charging rate,Relatively existing single current-limiting resistance or the not charging circuit of current-limiting resistance,Charging rate is accelerated again in the case that inhibiting big surge charging current,Improve the job stability of entire circuit devcie.
Description
Technical field
The present invention relates to AC/DC power inverters field more particularly to a kind of power source charges control circuits and power source charges
Control method.
Background technology
It is applied to high-power power supply AC/DC (ac/dc) power inverter at present, as being applied to transducer air conditioning
The power inverter of the high direct voltage power supply (more than 300V) of compressor drive circuit, the electrolysis of large capacity will be used in DC side
Capacitance does smothing filtering (more than 400uF), and in powered on moment, AC power can be by current limiting device such as PTC or resistance to electricity
Capacitor charging is solved, all needs the longer charging time only with single current limiting device at present, so that power inverter needs
The relatively long time could export stable DC to subsequent load supplying；And if not using current limiting device, directly to
When electrolytic capacitor charges, since electrolytic capacitor capacity causes greatly charging current moment very big, electric charging current is caused to pass through
The device crossed such as rectifier bridge stack, pfc circuit need to bear great charging current, while also causing the electric stress of electrolytic capacitor non-
Chang great affects the working life of these devices.
The above is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that the above is existing skill
Art.
Invention content
The main purpose of the present invention is to provide a kind of power source charges control circuits, it is therefore intended that solves existing convertible frequency air-conditioner
Device on startup compressor operation promoted frequency slowly cause the refrigeration of air conditioner or heating capacity cannot be quick relatively
Output, to influence the comfortable sexual experience problem of user.
To achieve the above object, a kind of power source charges control circuit provided by the invention, the power source charges control circuit
Including rectification module, electrolytic capacitor, load, MCU and several current limliting modules；
The rectification module input terminal connects AC power, and the rectification module output end connects DC bus, the electricity
It is in parallel with the DC bus to solve capacitance, the alternating current constitutes charge circuit through the rectification module output ripple direct current,
With to the electrolytic capacitor charging and output smoothing direct current, for the load supplying being connected on the DC bus；
It is connected on the charge circuit after several described current limliting wired in parallel, is controlled by the MCU when powering on
Several described current limliting module timesharing are single or several conductings are to charge to the electrolytic capacitor.
Preferably, each current limliting module includes switch unit and current limiting device unit；
The switch unit and current limiting device unit series connection；
When the switch unit is connected under MCU controls, the current limiting device unit access the current supply circuit with
It charges to the electrolytic capacitor.
Preferably, several current limliting block coupled in series of the parallel connection are in the alternating current source or the DC bus
On.
Preferably, the electricity of the current limiting device unit for the current limliting module that the last one in the power source charges control circuit is connected
Resistance is zero.
Preferably, the switch unit includes relay, and the both ends of the switch of the relay are the switch unit
The coil one end at both ends, the relay connects DC power anode, and the other end of the relay coil connects the MCU.
Preferably, the switch unit includes silicon-controlled, and two silicon-controlled main electrodes are the switch unit
Both ends, the silicon-controlled control pole connect the MCU.
Preferably, the power source charges control circuit further includes voltage detection module,
The voltage detection module is connected on the DC bus, for detecting the d-c bus voltage value and inputting
To the MCU, when powering on the MCU according to the voltage value control several described current limliting module timesharing it is single or several
Conducting is to charge to the electrolytic capacitor.
To achieve the above object, the present invention also provides a kind of power source charges control methods, and electricity is controlled based on above-mentioned power supply
Road, the voltage charge control method include：
When the power source charges control circuit powers on, current-limiting resistance in charge circuit is controlled in the first preset time and is hindered
It is worth big current limliting module to charge to electrolytic capacitor；
The small current limliting module of current-limiting resistance resistance value is controlled in charge circuit in next second preset time to electrolysis
Capacitor charging.
Preferably, further include after the small current limliting module access charge circuit of step control resistance：
The current limliting module of current-limiting resistance resistance value minimum is controlled to accessing charge circuit, other current limliting modules are disconnected from charge circuit
It opens.
Preferably, further include after the small current limliting module access charge circuit of step control resistance：
The current limliting module of current-limiting resistance resistance value minimum is controlled to accessing charge circuit, other current limliting modules are disconnected from charge circuit
It opens.
To achieve the above object, the present invention also provides a kind of power source charges control methods, and electricity is controlled based on above-mentioned power supply
Road, the voltage charge control method include：
When the power source charges control circuit powers on, the MCU obtains the d-c bus voltage value；
The current limliting module, which is controlled, according to the voltage value is sequentially ingressed into charge circuit to charge to the electrolytic capacitor,
In when voltage value is small, access charge circuit in current limliting module current-limiting resistance resistance value it is big, when voltage value is big, access is filled
The resistance value of the current-limiting resistance of current limliting module in electrical circuit is small.
The power source charges control circuit of the present invention, by exporting direct current to electrolytic capacitor by the rectified module of AC power
It charges to constitute charge circuit, and by being connected on above-mentioned charge circuit after several current limliting wired in parallel are arranged,
Several above-mentioned current limliting module timesharing are controlled individually by MCU when powering on or several conductings are to charge to the electrolytic capacitor,
The present embodiment is since by controlling, several current limliting module timesharing are single or multiple conductings so that the current limliting in charge circuit
The resistance value of resistance is different in time-sharing charging, and the current-limiting resistance resistance value to charge first is greatly to inhibit surge, the current limliting to charge afterwards
Resistance is small to accelerate charging rate, relatively existing single current-limiting resistance or the charging circuit without phase current resistance,
It is inhibiting big surge charging current to accelerate charging rate again, is improving the operation is stable of entire circuit devcie
Property.
Description of the drawings
Fig. 1 is the electrical block diagram of power source charges control circuit first embodiment of the present invention；
Fig. 2 is the physical circuit schematic diagram of power source charges control circuit first embodiment of the present invention；
Fig. 3 is the physical circuit schematic diagram of power source charges control circuit second embodiment of the present invention；
Fig. 4 is the electrical block diagram of power source charges control circuit 3rd embodiment of the present invention；
Fig. 5 is the flow diagram of power source charges control method of the present invention；
Fig. 6 is the flow diagram of power source charges control method of the present invention.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
The present invention proposes a kind of power source charges control circuit, and the control circuit by alternating current by being converted to high direct voltage
Electricity, as inputting the alternating current for being 220V, the direct current of output can reach 300V or more, to need the load of high current
Power supply is such as IPM (intelligent power module) power supplies of driving compressor, or to drive the IPM module for power supply etc. of direct current generator,
The basic circuit structure figure of the power source charges control circuit of the present embodiment is as shown in Figure 1, the power source charges control circuit includes whole
Flow module 10, electrolytic capacitor E2, load 20, MCU30 and several current limliting modules, in order to export big electric current, electricity here
Solving the larger current limliting module generally in 400uF or more, Fig. 1 of capacitance, there are three be respectively 40,50 and 60；
10 input terminal of rectification module connects AC power, and 10 output end of rectification module connects DC bus, electrolytic capacitor E2
In parallel with DC bus, the rectified 10 output ripple direct current of module of alternating current constitutes charge circuit, to be filled to electrolytic capacitor E2
Electricity and output smoothing direct current, the load 20 to be connected on DC bus are powered, and rectification module 10 can be by rectifier bridge stack
Or the rectification circuit of discrete component composition, it is rectifier bridge stack in Fig. 1, the charge circuit in Fig. 1 here refers to alternating current from firewire L
Or zero curve N sets out, and after being input to rectification module 10, exports what direct current constituted electrolytic capacitor E2 chargings from rectification module 10
Circuit.
It is connected on current supply circuit after several current limliting wired in parallel, several current limliting modules is controlled upper by MCU30
Timesharing is single when electric or several conductings are to charge to electrolytic capacitor E2.
In Fig. 1, an input of the N lines and rectification module 10 of exchange input is connected on after three current limliting module 40-60 parallel connections
Between end, and single or several conductings in these three are controlled to charge to electrolytic capacitor E2, wherein here by MCU30
Several refer to two or more.
When MCU30 specifically controls these several current limliting module timesharing and charges to electrolytic capacitor E2, first charge
Current limliting mould current-limiting resistance in the block is big, to inhibit the surge current of powered on moment well, after the current limliting module that charges
In current-limiting resistance want small, at this time due to being not in surge current, small current-limiting resistance accelerate charging rate.
Specifically, current limliting module includes switch unit and current limiting device unit, switch unit and the series connection of current limiting device unit；
When switch unit is connected under MCU controls, current limiting device unit accesses current supply circuit to charge to electrolytic capacitor.Such as current limliting module
40 include switch unit 41 and current limiting device unit 42, and switch unit 41 can be made of switching device such as relay, power tube etc.,
Current limiting device unit 42 can be made of current limiting element such as cement resistor, PTC resistor etc..
When MCU30 controls single current limliting module timesharing conducting, the current limliting mould current limiter in the block of charge circuit is first accessed
The resistance of part unit is big, rear to access in the current limliting module of charge circuit to inhibit the surge current of powered on moment well
The resistance of current limiting device unit want small, to accelerate charging rate.Further, the current limliting mould of charge circuit is finally accessed
It is zero that the resistance of current limiting device unit in the block, which is preferably resistance, i.e., current limiting device unit can be Zero-ohm resistor at this time
Either straight-through conducting wire at this time will not because electrolytic capacitor has nearly been full of or has been filled with by the charging by front
Surge current is generated, therefore power supply can be led directly to, avoids due to current limiting device the work after subsequently to electrolytic capacitor charging complete
Fever generates power consumption during making.
When MCU30 controls several current limliting module timesharing conducting, then in the current limliting module for removing last access charge circuit
Current limiting device unit except, other current limiting device unit resistance values can be identical, this is because these current limiting devices be simultaneously
Connection, the resistance value after parallel connection is certainly smaller than each current limiting device resistance value in parallel line, therefore ought control one of current limliting first
Device accesses after charge circuit charges to electrolytic capacitor, then when controlling another access charge circuit, two current limiters at this time
Part constitutes in parallel, and resistance value will become smaller, and realizes the purpose for accelerating charging rate with this, and the current limiting device of the last one access
Then resistance is zero, realizes straight-through power supply.
In the present embodiment, current limliting block coupled in series is on the zero curve N or firewire L of alternating current source, current limliting module in Fig. 1
It is connected on exchange N lines, can also be connected on L lines.
As a concrete application circuit of the present embodiment, as shown in Fig. 2, the switch unit in Fig. 2 is made of relay,
Current limiting device unit is made of PTC resistor, further includes opening MCU30 progress low pressure 5V and relay 12V DC power supply in figure
Powered-down source A0, the DC high-voltage of Switching Power Supply A0 loads is by electric through electrolysis again after the rectified bridge heap BR1 rectifications of AC power
Hold PE1 smothing filterings output DC high-voltage to provide, since the power that MCU30 and relay need in total is very low,
Electrolytic capacitor PE1 very littles such as only 40uF or so, will not be because charging with forming surge when powering on to this electrolytic capacitor PE1.In figure
There are one independent drive modules to carry out driving switch switching for switch unit in each switch module 40-60, such as switchs single
Member 41 has drive module 80 to be driven, and drive module 80 is mainly made of the first triode Q1, collector connecting valve
The base stage of coil one end of the first relay RY2 of unit 41, the first triode Q1 passes through the one of first resistor R5 connections MCU30
A control port, after sending out high-level control signal control the first triode Q1 conductings by MCU30, the first relay RY1's
Coil obtain it is electric after controller switches be attracted so that the first PTC resistor PTC1 access；Other current limliting modules 50 and 60 work it is former
Reason is identical with current limliting module 40, it is worth noting that, the current limiting device unit of current limliting module 60 is zero resistance conducting wire, direct in figure
It is replaced, therefore is not shown in figure by the conducting wire connected, current limliting module 60 finally accesses in these three current limliting modules.
Electrolytic capacitor in Fig. 2 has multiple, is E2, E3, E4 respectively, since load 20 be the IPM modules 21 for being responsible for driving
Big with the operating current of compressor 22, load, the electrolytic capacitor capacity of the smothing filtering needed is very big, therefore passes through three electricity
It solves capacitance parallel connection to realize, when such as each electrolytic capacitor capacity is 600uF, three parallel connections can reach 1800uF.To this three
In the circuit of electrolytic capacitor charging, the pfc circuit 70 being connected between rectification module 10 and electrolytic capacitor is also added, responsible pair
The direct current that rectification module 10 exports carries out Active PFC, and wherein pfc circuit 70 is mainly by IGBT power tubes Q7 and reactance
Device L1 compositions, power tube Q7 output a control signal to IGBT driving units by another control port of MCU30 and drive this
Power tube Q7 carries out on off state switching, to realize the normal work of PFC module 70.
Power source charges control circuit operation principle in Fig. 2 is as follows：When powering on, exported after Switching Power Supply A0 work once electrifieds
DC power supply is powered to MCU30, and high level is exported so that the one or three pole by first control port first after MCU30 work
Pipe Q1 conducting so that the coil of the first relay RY1 obtain it is electric after controller switches be attracted so that the first PTC resistor PTC1 connects
Enter in charge circuit, at this time alternating current output ripple direct current after rectified 10 rectification of module of this PTC resistor, and through PFC moulds
Block 70 carries out electrolytic capacitor E2, E3, E4 charging of output three large capacities of direct current pair after Active PFC, due to first
The resistance value setting of PTC resistor PTC2 is compared as large as 80 ohm, and charging current is relatively small at this time, the charging current such as most started
It is increased and charging current reduction then as the voltage on electrolytic capacitor for 10A or less, wave when this charging current is relatively straight-through
It gushes that electric current is much smaller, is then passed through a very short preset time such as after a few tens of milliseconds；First control port of MCU30 is defeated
Go out low level, second control port output high level makes the control of the first relay RY1 switchs to disconnect, the second relay
The control switch of RY2 is attracted so that the first PTC resistor PTC1 is disconnected from charge circuit, and the second PTC resistor PTC2 accesses are charged back
Lu Zhong, since resistance value ratio the first PTC resistor PTC1 resistance values of the second PTC resistor PTC2 are small, charging current is than the first PTC
Big when resistance PTC1 accesses, voltage when due to the first PTC resistor PTC1 accesses on electrolytic capacitor has charged to certain value, such as
Half when being completely filled with will not occur big when accessing the second PTC resistor PTC2 and continuing to charge to electrolytic capacitor
Surge current, and opposite first PTC resistor PTC1 wants charging rate to accelerate, by the second PTC resistor PTC2 to electrolytic capacitor
After another very short preset time that charges, second control port of MCU30 exports low level, and the output of third control port is high
Level makes the control of the second relay RY2 switchs to disconnect, and the control switch of third relay RY3 is attracted so that the 2nd PTC electricity
It hinders PTC1 to disconnect from charge circuit, the switch access charge circuit of third relay RY3 is handed at this time due to not having current-limiting resistance
Galvanic electricity source charges to electrolytic capacitor by direct-passing mode, due to passing through the charging of the second PTC resistor PTC2, the electricity on electrolytic capacitor
Pressure is already close to saturation voltage, even if being charged at this time to electrolytic capacitor by direct-passing mode, by process in charge circuit
These resistance values of equivalent series resistance ESR existing for inside bulk resistor and electrolytic capacitor in rectification module 10 in rectifier diode
The equivalent current-limiting resistance of very little, charging current still will not increase suddenly, be not in surge current, pass through third relay
RY3 accesses charging is so that electrolytic capacitor is charged to charging process when saturation state is completed to power on this to electrolytic capacitor.Hereafter
The long-term attracting states of third relay RY3, AC power is maintained to pass through third relay RY3, rectification module 10, PFC moulds with this
Block 70 and electrolytic capacitor output high voltage direct current (to inputting as DC bus-bar voltage for 220V alternating currents up to 320V or so)
Through DC bus to 20 power supply of load.
These three relays are controlled in above-mentioned MCU30 to be individually connected so that PTC resistor is sequentially ingressed into charge circuit to electrolysis
Outside capacitor charging, it is also based on several modes simultaneously turned in these three relays that control and controls PTC resistor and access and fill
Electrical circuit is to charge to electrolytic capacitor.The first PTC resistor PTC1 and the second PTC resistor PTC2 resistance values can be identical at this time, specifically
Control is as follows：The first relays of control of MCU30 first RY1 is attracted so that in the first PTC resistor PTC1 access charge circuits, is handed over
Galvanic electricity source the first PTC resistor PTC1 charges to electrolytic capacitor, after a very short preset time, MCU30 controls the
Two relay RY2 are attracted so that the second PTC resistor PTC2 is also accessed in charge circuit, at this time due to the first PTC resistor PTC1 and
Second PTC resistor PTC2 is in parallel so that total current-limiting resistance resistance value becomes smaller, and accelerates at this time to the speed of electrolytic capacitor charging, most
MCU30 controls the first relay RY1 and the second relay RY2 and disconnects afterwards, and third relay RY3 is attracted, at this time alternating current with
Straight-through mode goes directly to saturation voltage to electrolytic capacitor charging.Here the first PTC resistor PTC1 and the second PTC resistor PTC2 resistances
Value can also be different, and such as the first PTC resistor PTC1 is bigger than the second PTC resistor PTC2 resistance values, in this way as the second PTC resistor PTC2
When access, it is in parallel after resistance smaller, with this so that charging rate faster.
It is worth noting that in the present embodiment, current limliting module is set as 3, and the whole process of charging is divided into 3 stages
It realizes, the inhibition surge charging of relatively low current when beginning is finally straight-through be charged to followed by relatively large quick charge
The saturation voltage stage；It is 2 either 2 or more quantity such as 4 or 2, charging stage that current limliting module, which can also be arranged,
But as long as then mutually should be 4 either 2 be to control the single timesharing of its charging module or several conductings so that filling first
Electric current is big, and the small circuit structure of subsequent charging current is all the protection scheme of the embodiment of the present invention.
The power source charges control circuit of the embodiment of the present invention, by exporting direct current to electricity by the rectified module of AC power
Solution capacitance charges to constitute charge circuit, and by being connected on above-mentioned charge circuit after several current limliting wired in parallel are arranged
On, several above-mentioned current limliting module timesharing are controlled individually by MCU when powering on or several conductings are with to the electrolytic capacitor
Charging, the present embodiment is since by controlling, several current limliting module timesharing are single or several are connected so that in charge circuit
In current-limiting resistance resistance value it is different in time-sharing charging, and the current-limiting resistance resistance value to charge first is greatly to inhibit surge, after fill
The current-limiting resistance resistance value of electricity is small to accelerate charging rate, and relatively existing single current-limiting resistance or no phase current resistance fill
Circuit is inhibiting big surge charging current to accelerate charging rate again, is improving the work of entire circuit devcie
Make stability.
Further, power source charges control circuit first embodiment of the present invention, power source charges control circuit of the present invention are based on
In second embodiment, as shown in figure 3, the switch unit of switch module includes silicon-controlled, silicon-controlled two main electrodes are switch
The both ends of unit, silicon-controlled control pole connect MCU30, specifically, in figure 3, the switch unit of three switch module 40-60
It is all made of bidirectional triode thyristor, two main electrode T1, T2 accesses in charge circuit, and controller G is further by silicon-controlled isolation
Drive module 80 drives, and MCU30 is worked by control port to control this drive module 80.By taking switch unit 41 as an example, open
It closes unit 41 to be made of the first silicon-controlled TR1, one main electrode connects alternating current source, another main electrode T2 connection current limlitings
One end of first PTC resistor PTC1 of device cell, the poles control pole G of the first silicon-controlled TR1 by MCU30 a control port
Control is lower to drive its work by drive module 80.Such as when this control port of MCU30 exports high level, drive module is controlled
Two main electrodes conducting of 80 the first silicon-controlled TR1 of driving so that the first PTC resistor PTC1 accesses charge circuit to electrolytic capacitor
It charges.
It is the similar of relay with the switch unit of first embodiment in specific operation principle, it is silicon-controlled controlling
When conducting, the situation of single timesharing conducting and the conducting of several Parallel Time-sharings all realizes the charging current in rigid start with this
Relatively low inhibition surge, is then charged up electric current greatly charging quickly speed, is finally charged with direct-passing mode.It is existing in contrast
Charging rate when technology realizes while inhibiting surge and can accelerate to power on.
Further, power source charges control circuit first embodiment of the present invention, power source charges control circuit of the present invention are based on
In 3rd embodiment, as shown in figure 4, being different from the first embodiment in, several current limliting block coupled in series in parallel are straight
Flow busbar on, that is, be series between rectification module 10 and electrolytic capacitor 20, can specifically be connected on DC bus electrode line or
In person's negative line.Its operation principle is identical with the first embodiment.
Further, power source charges control circuit first or second embodiments of the present invention, power source charges control of the present invention are based on
In circuit fourth embodiment processed, as shown in Figure 2 or Figure 3, power source charges control circuit further includes voltage detection module 90, voltage inspection
Module 90 is surveyed to be connected on DC bus, for detecting d-c bus voltage value and being input to MCU30, the MCU30 roots when powering on
Several current limliting module timesharing are controlled according to voltage value individually or several conductings are to charge to electrolytic capacitor.
In first or second embodiments, MCU30 is to control several current limliting modules based on the different time come controller to connect
Enter into charge circuit, i.e., is charged back at the time of MCU30 realizes different by timing with controlling different current limliting module accesses
Lu Zhong.And in the present embodiment, MCU30 is on the DC bus-bar voltage i.e. electrolytic capacitor detected based on voltage detection module 90
The difference of charging voltage accesses to control different current limliting modules in charge circuit.
Specific voltage detection module 90 will be examined as shown in Fig. 2, be made of divider resistance R130, R139, R142 and R161
The low tension for measuring characterization DC bus-bar voltage is input to a detection port of MCU30.Its specific operation principle is：Upper
When electric, MCU30 control first in current limiting device resistance value big switch unit such as Fig. 2 as switch unit 41 the first relay
RY1 is connected, and in control the first PTC resistor PTC1 access charge circuits, while MCU30 monitors d-c bus voltage value, works as direct current
When bus voltage value rises to the first preset value such as 200V, the first relay of control RY1 is disconnected, and the second relay RY2 conductings make
The resistance value second PTC resistor PTC2 conducting small with respect to the first PTC resistor PTC1 is obtained, to accelerate charging rate, when in MCU30 monitorings
When being raised to the second preset value such as 300V, the second relay of control RY2 is disconnected, and the RY3 conductings of third relay are controlled at this time with straight-through
Mode continue charging until electrolytic capacitor is filled to saturation voltage to electrolytic capacitor.
In addition to the single current limliting module of above-mentioned control is according in different d-c bus voltage value timesharing access charge circuits
Control mode, it is similar with first embodiment, it can also control according to different d-c bus voltage values several current limliting modules simultaneously
Connection, which is linked into, inhibits the smaller current of surge to charge when being powered in charge circuit to realize, the charging of larger current charging then
Mode.
Opposite first embodiment is accessed to control different current limliting modules in charge circuit with different timing times
Mode determines that different current limliting modules accesses charging in this implementation by increasing voltage detection module detection DC bus-bar voltage
Circuit minute, since when the capacity difference of electrolytic capacitor, charging rate is different, and charging according to first embodiment is controlled
Circuit arrangement processed, it may be necessary to according to the timing of the different preset time of the different designs of electrolytic capacitor, to realize the present invention's
Precise stage charging purpose, as only there are one preset time meters previous in electrolytic capacitor and three electrolytic capacitor parallel arrangements
When scheme certainly than three electrolytic capacitors it is small, the control software for needing corresponding MCU30 different with this；And the present embodiment is direct
It is controlled according to the voltage value on electrolytic capacitor in different current limliting module access charge circuits, a variety of different electricity can be adapted to
The mode for solving capacitance, can realize the accurate charging in each stage, therefore the charging control circuit project compatibility of the present embodiment
More preferably.
The present invention also proposes a kind of power source charges control method, based on above-mentioned power source charges control circuit, such as Fig. 5 institutes
Show, this method includes：
Step S101 controls current limliting in charge circuit when power source charges control circuit is powered in the first preset time
The big current limliting module of resistance charges to electrolytic capacitor；
Step S102 controls the current limliting mould that current-limiting resistance resistance value is small in charge circuit in next second preset time
Block charges to electrolytic capacitor.
By taking the power source charges control circuit in Fig. 2 as an example, the step of charging, is divided into three phases.
According to capacitance voltage charge formula：
Wherein, UCFor electrolytic capacitor both ends virtual voltage；
V0When to start to charge up, the initial voltage at electrolytic capacitor both ends；
V is the target charging voltage of electrolytic capacitor；
RC is electrolytic capacitor charge constant；
T is the electrolytic capacitor charging time；
Electrolytic capacitor charging current formula is as follows：
Ic：Electrolytic capacitor charging current；
R：Electrolytic capacitor charging resistor.
In order to facilitate calculating, specific formula for calculation given below is with the DC voltage and DC current of DC bus side
Parameter benchmark, by taking input AC electricity is 220V as an example, electrolytic capacitor total capacity is set as 1720uF, the target electricity on electrolytic capacitor
Pressure i.e. charging saturation voltage V is 320V, and the resistance value for the first PTC resistor PTC1 that the setting first stage is accessed first is 50 ohm,
Then V0=0, V=320V；
As t=0, Ic=V/R1=6.4A, later charging current reduced with exponential form, when by a RC times it is normal
After several chargings, capacitance voltage Uc=V* (1-1/e)=320*0.63=201.6V；
T1=RC=50*1720*10-6=86ms；
In the first charging stage i.e. in step slo, it is 86ms or so that the first preset time, which can be arranged, so that by the
One preset time, the voltage on electrolytic capacitor can rise to 201V, it can be seen that the charging current 6.4A that the first stage starts
It is smaller, it can be very good the formation for inhibiting surge；
In next second charging stage, the resistance value that the second PTC resistor PTC2 of access is arranged is 10 ohm, then V0
=201.6V, V=320V；
As t=0, Ic=(V-V0)/R=11.8A；Charging current is declined by exponential form later, when by 3 RC
Between constant charging after, capacitance voltage Uc=314V；
T2=3*R2*C=51.6ms；
I.e. in the second charging stage of step S20, it is 51ms or so that the second preset time, which can be arranged, when pre- by second
If after the time, the voltage on electrolytic capacitor can continuously rise to 314V, it can be seen that the charging electricity started in second stage
Stream is that the charging current 6.4A that 11.8A started with respect to the first stage is much bigger, accelerates charging rate with this；
In the phase III, by the charging of second stage, voltage solves saturation voltage value 320V, controls third at this time and opens
The relay of pass is connected, and controls the current limliting module of current-limiting resistance minimum at this time, i.e., with the straight-through shape of zero resistance in this programme
Formula charges to electrolytic capacitor, the saturation voltage due to voltage and very close to target, through over commutation mould when straight-through
These resistance value very littles of equivalent series resistance ESR existing for inside bulk resistor and electrolytic capacitor in block 10 in rectifier diode
Equivalent current-limiting resistance, charging current are not in surge phenomenon.
Thus after above-mentioned step S20, for triphasic charge control method, there is also control current limliting electricity
The step of small current limliting module of resistance resistance value accesses charge circuit, other current limliting modules are disconnected from charge circuit.If certainly only
Two current limliting modules, then only two stage charging process, this this step do not need.
The power source charges control method of the present invention may also adapt to the situation that charging module is 4 or 4 or more, this
When the charging stage be 4 or 4 or more, be required for the control by the first and second stages in step S10 and step S20
Method.
It is individually to control different current limliting module accesses in each stage in above-mentioned power source charges control method,
Can control the access of several current limliting modules in the intermediate stage several current limliting mould current limiters in the block are realized with this using
The mode of part parallel connection accesses charge circuit, can also realize that the intermediate charging stage realizes that high current accelerates the purpose of charging rate.
The power source charges control method of the present invention, by when power source charges control circuit powers on, in the first preset time
The big current limliting module of current limliting resistance value charges to electrolytic capacitor in interior control charge circuit, in next second preset time internal control
The small current limliting module of current limliting resistance value charges to electrolytic capacitor in charge circuit processed, is realized in the first preset time with opposite with this
Small electric current charging inhibits surge current, accelerates charging rate with relatively large electric current charging with this in the second preset time.
The present invention also proposes a kind of power source charges control method, based on above-mentioned power source charges control circuit, such as Fig. 6 institutes
Show, this method includes：
Step S201, when power source charges control circuit powers on, MCU obtains d-c bus voltage value；
Step S202 controls current limliting module according to voltage value and is sequentially ingressed into charge circuit to charge to electrolytic capacitor, wherein
When voltage value is small, the resistance value for accessing the current-limiting resistance of the current limliting module in charge circuit is big, when voltage value is big, access charging
The resistance value of the current-limiting resistance of current limliting module in circuit is small.
The difference is that, power source charges control method of the invention is according to direct current with above-mentioned voltage charge control method
Charging voltage value on bus voltage value, that is, electrolytic capacitor determines in different current limliting module access charge circuits.It specifically can needle
To the physical circuit in power source charges control circuit fourth embodiment of the present invention, MCU30 is obtained directly according to voltage detection module 90
Bus voltage value is flowed, is then determined and is accessed in different current limliting modules to charge circuit according to the difference of voltage value.
It is such as directed to the triphasic charging circuit of three current limliting modules composition in Fig. 2, specific rate-determining steps are：
The d-c bus voltage value very little that MCU30 is detected when powering on, the first relay of control RY1 are connected, are selected at this time
It selects and often charges to electrolytic capacitor in the first big PTC resistor PTC1 access charge circuits of current limiting device resistance, with this shape
At relatively small charging current to inhibit surge；
When detecting that d-c bus voltage value rises to 200V or so, the first relay of control RY1 is disconnected, the second relay
Device RY2 conductings, are disconnected with controlling the first PTC resistor PTC1 from charge circuit, the second small PTC resistor of simultaneous selection resistance
It charges to electrolytic capacitor in PTC2 access charge circuits, relatively large charging current is formed to accelerate charging rate with this；
When detecting that d-c bus voltage value rises towards the 300V or so of saturation voltage, the second relay is controlled
RY2 is disconnected, third relay RY3 conducting, and control the, PTC resistor PTC2 is from charge circuit disconnection, with direct-passing mode to electricity
Solution capacitance continue charging until charging rises to saturation voltage 320V.
Certainly in forming the charging current big charging stage, it can also be that the current limiting device before maintaining continues access and fills
Electrical circuit, while increasing other current limiting device access, that is, several current limiting devices access charge circuit is controlled, this is formed with this
The parallel of these current limiting devices equally reaches quickening and fills to reduce the current limiting device resistance of access charge circuit
The purpose of electric speed.
In the description of this specification, the description meaning of reference term " first embodiment ", " second embodiment ", " example " etc.
Refer to specific method, device or feature described in conjunction with this embodiment or example be contained at least one embodiment of the present invention or
In example.In the present specification, a schematic expression of the above terms does not necessarily refer to the same embodiment or example.And
And specific features, method, apparatus or the feature of description can be in any one or more of the embodiments or examples with suitable sides
Formula combines.In addition, without conflicting with each other, those skilled in the art can will be described in this specification different real
The feature for applying example or example and different embodiments or examples is combined.
It these are only the preferred embodiment of the present invention, be not intended to limit the scope of the invention, it is every to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of power source charges control circuit, the power source charges control circuit includes rectification module, electrolytic capacitor, load, MCU
And several current limliting modules；
The rectification module input terminal connects AC power, and the rectification module output end connects DC bus, the electrolysis electricity
Hold it is in parallel with the DC bus, the alternating current through the rectification module output ripple direct current to constitute charge circuit, to
The electrolytic capacitor charging and output smoothing direct current, for the load supplying being connected on the DC bus；
It is connected on the charge circuit after several described current limliting wired in parallel, when powering on by described in MCU controls
Several current limliting module timesharing are single or several conductings are to charge to the electrolytic capacitor.
2. power source charges control circuit as described in claim 1, which is characterized in that each current limliting module includes that switch is single
Member and current limiting device unit；
The switch unit and current limiting device unit series connection；
When the switch unit is connected under MCU controls, the current limiting device unit accesses the current supply circuit with to institute
State electrolytic capacitor charging.
3. power source charges control circuit as claimed in claim 2, which is characterized in that several current limliting module strings of the parallel connection
It is associated on the alternating current source or the DC bus.
4. power source charges control circuit as claimed in claim 2, which is characterized in that last in the power source charges control circuit
The resistance of the current limiting device unit of the current limliting module of one conducting is zero.
5. power source charges control circuit as described in claim 3 or 4, which is characterized in that the switch unit includes relay,
The both ends of the switch of the relay are the both ends of the switch unit, and coil one end connection DC power supply of the relay is just
The other end of pole, the relay coil connects the MCU.
6. power source charges control circuit as described in claim 3 or 4, which is characterized in that the switch unit include it is silicon-controlled,
Two silicon-controlled main electrodes are the both ends of the switch unit, and the silicon-controlled control pole connects the MCU.
7. power source charges control circuit as described in claim 3 or 4, which is characterized in that the power source charges control circuit is also
Including voltage detection module,
The voltage detection module is connected on the DC bus, for detecting the d-c bus voltage value and being input to institute
MCU is stated, the MCU controls several described current limliting module timesharing individually according to the voltage value when powering on or several are connected
To charge to the electrolytic capacitor.
8. a kind of power source charges control method of power control circuit as described in any one of claim 1 to 7, feature exist
In the voltage charge control method includes：
When the power source charges control circuit powers on, it is big that current-limiting resistance resistance value in charge circuit is controlled in the first preset time
Current limliting module to electrolytic capacitor charge；
The small current limliting module of current-limiting resistance resistance value is controlled in charge circuit in next second preset time to electrolytic capacitor
Charging.
9. power source charges control method as claimed in claim 8, which is characterized in that small in step control resistance
Further include after current limliting module access charge circuit：
The current limliting module for controlling current-limiting resistance resistance value minimum is disconnected to accessing charge circuit, other current limliting modules from charge circuit.
10. a kind of power source charges control method of power control circuit as described in any one of claim 1 to 7, feature exist
In the voltage charge control method includes：
When the power source charges control circuit powers on, the MCU obtains the d-c bus voltage value；
The current limliting module, which is controlled, according to the voltage value is sequentially ingressed into charge circuit to charge to the electrolytic capacitor, wherein when
Voltage value hour, the resistance value for accessing the current-limiting resistance of the current limliting module in charge circuit is big, and when voltage value is big, access is charged back
The resistance value of the current-limiting resistance of current limliting module in road is small.
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| CN112653228A (en) * | 2020-12-11 | 2021-04-13 | 山东电工电气集团新能科技有限公司 | Self-adaptive charging and discharging control system and control method for super capacitor |
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