CN208063051U - A kind of Switching Power Supply of photovoltaic DC-to-AC converter - Google Patents
A kind of Switching Power Supply of photovoltaic DC-to-AC converter Download PDFInfo
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- CN208063051U CN208063051U CN201820253106.6U CN201820253106U CN208063051U CN 208063051 U CN208063051 U CN 208063051U CN 201820253106 U CN201820253106 U CN 201820253106U CN 208063051 U CN208063051 U CN 208063051U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model embodiment discloses a kind of Switching Power Supply of photovoltaic DC-to-AC converter, including：The first input end of voltage transformation module is electrically connected with the first end of photovoltaic DC power supply, second input terminal of voltage transformation module is electrically connected with the second end of photovoltaic DC power supply, the cathode output end of voltage transformation module is for exporting the first positive voltage, and the cathode output end of voltage transformation module is for exporting the first negative voltage；The power supply signal output end of positive boost module is used to export second positive voltage of the absolute value more than the absolute value of the first positive voltage；The power supply signal output end of reversed boost module is used to export the second negative voltage of absolute value that absolute value is more than the first negative voltage.The technical solution of the utility model embodiment can provide power supply signal for the higher device of power and the lower device of power simultaneously by voltage transformation module, positive boost module and reversed boost module.
Description
Technical field
The utility model embodiment is related to the switch electricity of technical field of photovoltaic power generation more particularly to a kind of photovoltaic DC-to-AC converter
Source.
Background technology
In photovoltaic DC-to-AC converter field, for the output current sample circuit of photovoltaic DC-to-AC converter, general power supply is all
Directly export winding (being typically all ± 12V) by auxiliary transformer includes to the output current sample circuit of photovoltaic DC-to-AC converter
Device such as current Hall power elements, but for the higher device of power (general power is in 50KW or more products), due to
Output current is larger, and inverter will appear overload in some special cases, if at this time still using the supplier of electricity of ± 12V
Case can have following two problems：1) output current of current sampling circuit exceeds the current limit of Hall element, cannot be satisfied
The function that overload current normally detects under special status.2) it is rung when the instantaneous power of the output current sample circuit of photovoltaic DC-to-AC converter
Answer characteristic poor.
So generally directed to the higher product of power grade, it is common practice to improve confession of the power supply to Hall element
Piezoelectric voltage ensures the sampling precision in entire load section.Conventional way is that modification auxiliary transformer output voltage (is typically designed
In ± 15V).But it is also defective with this scheme, system power dissipation can be caused to increase due to increasing power supply voltage, reduce system
Efficiency.
Utility model content
In view of this, the utility model embodiment provides a kind of Switching Power Supply of photovoltaic DC-to-AC converter, can be work(simultaneously
The higher device of rate and the lower device of power provide power supply signal.
The utility model embodiment provides a kind of Switching Power Supply of photovoltaic DC-to-AC converter, including：
The first end of voltage transformation module, the first input end and photovoltaic DC power supply of the voltage transformation module is electrically connected
It connects, the second input terminal of the voltage transformation module is electrically connected with the second end of the photovoltaic DC power supply, the voltage conversion
For the cathode output end of module for exporting the first positive voltage, the cathode output end of the voltage transformation module is negative for exporting first
Voltage；
Positive boost module, the anode of the power supply signal input and the voltage transformation module of the forward direction boost module
Output end is electrically connected, and the power supply signal output end of the forward direction boost module is more than first positive voltage for exporting absolute value
Absolute value the second positive voltage；
Reversed boost module, the anode of the power supply signal input and the voltage transformation module of the reversed boost module
Output end is electrically connected, and the power supply signal output end of the reversed boost module is more than first negative voltage for exporting absolute value
The second negative voltage of absolute value.
Optionally, the voltage transformation module includes armature winding, the first secondary windings, second subprime winding and third time
The first end of grade winding, the first end of the second subprime winding and the third secondary windings is Same Name of Ends, described second
The second end of grade winding and the second end of the third secondary windings are Same Name of Ends；
First secondary windings is connected with the second subprime windings in series.
Optionally, the voltage transformation module further includes transistor, the first control chip, the first diode, the two or two pole
Pipe, third diode, the first polar capacitor, the second polar capacitor and third polar capacitor；
The first end of the armature winding is electrically connected with the drain electrode of the transistor, and the source electrode of the transistor connects with first
Ground terminal is electrically connected；
The control terminal of the transistor is electrically connected with the output end of the first control chip；
The source electrode of the transistor is electrically connected with the first end of the photovoltaic DC power supply, the second end of the armature winding
It is electrically connected with the second end of the photovoltaic DC power supply, the moon of the first end of first secondary windings and first diode
Pole is electrically connected, and the anode of first diode is electrically connected with the cathode of first polar capacitor, first polar capacitor
Anode and the second end of first secondary windings be electrically connected, and be electrically connected with the second ground terminal；
The second end of first secondary windings is electrically connected with the first end of the second subprime winding, the second subprime
The second end of winding is electrically connected with the anode of second diode, the cathode of second diode and second polarity electricity
The anode electrical connection of appearance, the cathode of second polar capacitor are electrically connected with the first end of the secondary windings, second pole
Cathode output end of the anode of property capacitance as the voltage transformation module, the cathode of first polar capacitor is as the electricity
Press the cathode output end of conversion module；
The first end of the third secondary windings is electrically connected with first ground terminal, and the first of the third secondary windings
End is electrically connected with the cathode of the third polar capacitor, the cathode of the anode and the third diode of the third polar capacitor
Electrical connection, the anode of the third diode are electrically connected with the second end of the third secondary windings, the third polar capacitor
Anode with it is described first control chip power supply signal input be electrically connected.
Optionally, the positive boost module includes the first inductance, the 4th diode, the second control chip and quadripolarity
Capacitance；
The driving tube collector terminal of the second control chip is electrically connected with the first end of first inductance, and described second
The driving tube collector terminal of control chip is electrically connected with the cathode output end of the voltage transformation module；
The power supply signal input of the second control chip is electrically connected with the cathode output end of the voltage transformation module；
The second end of first inductance is electrically connected with the switching tube collector terminal of the second control chip；
The second end of first inductance and the switching tube collector terminal of the second control chip are respectively with the described 4th
The anode of diode is electrically connected, and the cathode of the 4th diode is electrically connected with the anode of the quadripolarity capacitance, as institute
State the power supply signal output end of positive boost module；
The cathode of the quadripolarity capacitance is electrically connected with the second ground terminal.
Optionally, the positive boost module further include the first current-limiting resistance, the second current-limiting resistance, the first divider resistance and
Second divider resistance；
The driving pipe collector of the second control chip is electrically connected with the first end of first current-limiting resistance, and described the
The second end of one current-limiting resistance is electrically connected with the first end of second current-limiting resistance, the second end of second current-limiting resistance with
The cathode output end of the voltage transformation module is electrically connected；
The peak current detection end of the second control chip is electrically connected with the second end of first current-limiting resistance；
The first end of first divider resistance is electrically connected with the cathode of the 4th diode, first divider resistance
Second end be electrically connected with the first end of second divider resistance, the second end of second divider resistance connects with described second
Ground terminal is electrically connected；
The second end of first divider resistance is electrically connected with the comparator inverting input of the second control chip.
Optionally, the positive boost module further includes the first polarity free capacitor；
The first electrode of first polarity free capacitor is electrically connected with the timing capacitor end of the second control chip, described
The second electrode of first polarity free capacitor is electrically connected with second ground terminal；
The ground terminal of the second control chip is electrically connected with second ground terminal.
Optionally, the reversed boost module includes the second inductance, the 5th diode, third control chip and the 5th polarity
Capacitance；
The switch pipe collector that the driving tube collector terminal of the third control chip controls chip with the third is electrically connected
It connects；
The driving tube collector terminal of the third control chip is electrically connected with the cathode output end of the voltage transformation module；
The power supply signal input of the third control chip is electrically connected with the cathode output end of the voltage transformation module；
The switching tube emitter terminal that the first end of second inductance controls chip with the third is electrically connected；
The second end of second inductance is electrically connected with third ground terminal；
The cathode of 5th diode is electrically connected with the first end of second inductance, the anode of the 5th diode
It is electrically connected with the cathode of the 5th polar capacitor, the power supply signal output end as the reversed boost module；Described 5th
The anode of polar capacitor is electrically connected with the third ground terminal.
Optionally, the reversed boost module further includes third current-limiting resistance, third divider resistance and the 4th divider resistance；
The driving pipe collector of third control chip is electrically connected with the first end of the third current-limiting resistance, and described the
The second end of three current-limiting resistances is electrically connected with the cathode output end of the voltage transformation module；
Third control chip peak point current electrical measurement end is electrically connected with the first end of the third current-limiting resistance；
The first end of the third divider resistance is electrically connected with the anode of the 5th diode, the third divider resistance
Second end be electrically connected with the first end of the 4th divider resistance, the second end of the 4th divider resistance connects with the third
Ground terminal is electrically connected；
The comparator inverting input that the second end of the third divider resistance controls chip with the third is electrically connected.
Optionally, the reversed boost module further includes the second polarity free capacitor；
The timing capacitor end that the first electrode of second polarity free capacitor controls chip with the third is electrically connected, described
The second electrode of second polarity free capacitor is electrically connected with the first end of the third divider resistance,
The ground terminal of the third control chip is electrically connected with the second electrode of second polarity free capacitor.
The utility model embodiment provides a kind of Switching Power Supply of photovoltaic DC-to-AC converter, passes through voltage transformation module, forward direction
Boost module and reversed boost module can provide power supply signal for the higher device of power and the lower device of power simultaneously.
Description of the drawings
Fig. 1 is a kind of circuit diagram of the Switching Power Supply for photovoltaic DC-to-AC converter that the utility model embodiment provides.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, it illustrates only for ease of description, in attached drawing and the relevant part of the utility model rather than entire infrastructure.
The utility model embodiment provides a kind of circuit structure of the Switching Power Supply of photovoltaic DC-to-AC converter, be mainly used as but
The electricity component being not limited in inverter, the driving element and senser element of common control module can use this reality
The Switching Power Supply of the photovoltaic DC-to-AC converter provided with new embodiment provides power supply for it.
Fig. 1 is a kind of switching power circuit figure for photovoltaic DC-to-AC converter that the utility model embodiment provides.It, should referring to Fig. 1
The Switching Power Supply of photovoltaic DC-to-AC converter includes：Voltage transformation module 100, the first input end and photovoltaic of voltage transformation module 100 are straight
The first end in galvanic electricity source 200 is electrically connected, the second end of the second input terminal and photovoltaic DC power supply 200 of voltage transformation module 100
Electrical connection, for the cathode output end of voltage transformation module 100 for exporting the first positive voltage, the cathode of voltage transformation module 100 is defeated
Outlet is for exporting the first negative voltage；Illustratively, the first positive voltage is+12V, and the first negative voltage is -12V.Forward direction boosting mould
Block 300, the power supply signal input of positive boost module 300 are electrically connected with the cathode output end of voltage transformation module, and forward direction rises
The power supply signal output end of die block is used to export second positive voltage of the absolute value more than the absolute value of the first positive voltage；It is reversed to rise
The power supply signal input of die block 400, reversed boost module 400 is electrically connected with the cathode output end of voltage transformation module 100,
The power supply signal output end of reversed boost module 400 is used to export the second negative electricity of absolute value that absolute value is more than the first negative voltage
Pressure.Illustratively, the second positive voltage is+15V, and the second negative voltage is -15V.
The Switching Power Supply of the photovoltaic DC-to-AC converter of power supply signal, general power supply electricity are provided for photovoltaic DC-to-AC converter in the prior art
Source is all directly to export winding (being typically all ± 12V) to the output current sample circuit of photovoltaic DC-to-AC converter by auxiliary transformer
Including device such as current Hall power elements, but (general power is produced in 50KW or more for the higher device of power
Product), since output current is larger, inverter will appear overload in some special cases, generally directed to power grade compared with
High product, it is common practice to improve supply voltage of the power supply to Hall element, ensure the sampling in entire load section
Precision.Conventional way is modification auxiliary transformer output voltage (being typically designed in ± 15V).But the defect with this scheme is
System power dissipation can be caused to increase due to increasing power supply voltage, reduce system effectiveness.The utility model embodiment provides one
The Switching Power Supply of kind of photovoltaic DC-to-AC converter can be simultaneously by voltage transformation module, positive boost module and reversed boost module
The higher device of power and the lower device of power provide power supply signal, illustratively, can both provide the power supply letter of ± 12V
Number, the power supply signal of ± 15V can also be provided.Illustratively, when the Switching Power Supply of photovoltaic DC-to-AC converter exclusively for output current suddenly
You power at device, have thus widened the load section of hall device, ensure that product remains to linearly in accidental transient error
Sampled output current, it is ensured that inverter normal operation, while accessory power supply output ± 12V continues as system other control modules
Power supply.It both can guarantee that current sample function was normal in this way, while having taken into account the power consumption of reduction system, the efficiency of lifting system.
Optionally, voltage transformation module 100 includes armature winding 101, the first secondary windings 102, second subprime winding 103
With third secondary windings 104, the first end of second subprime winding 103 and the first end of third secondary windings 104 are Same Name of Ends, the
The second end of secondary stage winding 103 and the second end of third secondary windings 104 are Same Name of Ends；First secondary windings 102 and second
Secondary windings 103 is connected in series with.The electric current of third secondary windings output and the electric current of second subprime winding output are equal.It is optional
, voltage transformation module 100 further includes that transistor 105, first controls chip 106, the first diode 107, the second diode
108, third diode 109, the first polar capacitor 110, the second polar capacitor 111 and third polar capacitor 112；Armature winding
101 first end is electrically connected with the drain electrode of transistor 105, and the source electrode of transistor 105 is electrically connected with the first ground terminal 113；Crystal
The control terminal of pipe 105 is electrically connected with the output end 1061 of the first control chip 106；The source electrode of transistor 105 and photovoltaic DC electricity
The first end in source 200 is electrically connected, and the second end of armature winding 101 is electrically connected with the second end of photovoltaic DC power supply 200, for the first time
The first end of grade winding 102 is electrically connected with the cathode of the first diode 107, the anode of the first diode 107 and the first polarity electricity
Cathode (-) electrical connection of appearance 110, the second end electrical connection of the anode (+) of the first polar capacitor 110 and the first secondary windings 102,
And it is electrically connected with the second ground terminal 114；The second end and the first end of second subprime winding 103 of first secondary windings 102 are electrically connected
It connects, the second end of second subprime winding 103 is electrically connected with the anode of the second diode 108, the cathode of the second diode 108 and
The anode electrical connection of two polar capacitors 111, the first end of the cathode and second subprime winding 103 of the second polar capacitor 111 are electrically connected
It connects, the cathode output end of the anode of the second polar capacitor 111 as voltage transformation module 100, the cathode of the first polar capacitor 110
Cathode output end as voltage transformation module 100；The first end of third secondary windings 104 is electrically connected with the first ground terminal 113,
The first end of third secondary windings 104 is electrically connected with the cathode of third polar capacitor 112, third polar capacitor 112 anode with
The cathode of third diode 109 is electrically connected, and the anode of third diode 109 is electrically connected with the second end of third secondary windings 104,
The anode of third polar capacitor 104 is electrically connected with the power supply signal input 1062 of the first control chip 106.
It should be noted that in the present embodiment, voltage transformation module 100 is flyback transformer, and flyback transformer exists
It controls during switching transistor 105 is connected and does not provide power to the first secondary windings, second subprime winding and third secondary windings
Storage energy is only just converted to counter electromotive force to the first secondary windings, the by output during control switching transistor 105 turns off
Secondary stage winding and third secondary windings provide power output and provide output；Wherein, the first end of second subprime winding 103 and
The first end of three secondary windings 104 is Same Name of Ends, the second end of second subprime winding 103 and the second of third secondary windings 104
End is Same Name of Ends；First secondary windings 102 and second subprime winding 103 are connected in series with.Third secondary windings output electric current and
The electric current of second subprime winding output is equal.The output end of third secondary windings is that the first control chip 106 provides power supply signal.
Illustratively, the first control chip can be that pulse width modulates (Pulse Width Modulation, PWM) chip, be profit
It in the present embodiment can come a kind of very effective technology controlled analog circuit with the numeral output of microprocessor
With the conducting or shutdown of controlling transistor 105.
Optionally, positive boost module 300 includes the first inductance 301,303 and of the 4th diode 302, second control chip
Quadripolarity capacitance 304；The driving tube collector terminal 3031 and the first end of the first inductance 301 of second control chip 303 are electrically connected
It connects, the driving tube collector terminal 3031 of the second control chip 303 is electrically connected with the cathode output end of voltage transformation module 100；The
The power supply signal input 3032 of two control chips 303 is electrically connected with the cathode output end of voltage transformation module 100；First inductance
301 second end is electrically connected with the switching tube collector terminal 3033 of the second control chip 303；The second end of first inductance 301 and
303 switching tube collector terminals 3033 of the second control chip are electrically connected with the anode of the 4th diode 302 respectively, the 4th diode
302 cathode is electrically connected with the anode of quadripolarity capacitance 304, the power supply signal output end as positive boost module 300；The
The cathode of quadripolarity capacitance 304 is electrically connected with the second ground terminal 114.Optionally, positive boost module 300 further includes the first current limliting
Resistance 305, the second current-limiting resistance 306, the first divider resistance 307 and the second divider resistance 308；The drive of second control chip 303
Dynamic pipe collector 3031 is electrically connected with the first end of the first current-limiting resistance 305, the second end of the first current-limiting resistance 305 and the second limit
The first end of leakage resistance 306 is electrically connected, the cathode output end of the second end and voltage transformation module 100 of the second current-limiting resistance 306
Electrical connection；The peak current detection end 3034 of second control chip 303 is electrically connected with the second end of the first current-limiting resistance 305；The
The first end of one divider resistance 307 is electrically connected with the cathode of the 4th diode 302, the second end of the first divider resistance 307 and the
The first end of two divider resistances 308 is electrically connected, and the second end of the second divider resistance 308 is electrically connected with the second ground terminal 114；First
The second end of divider resistance 307 is electrically connected with the comparator inverting input 3035 of the second control chip 303.Optionally, positive
Boost module 300 further includes the first polarity free capacitor 309；The first electrode of first polarity free capacitor 309 and the second control chip
303 timing capacitor end 3036 is electrically connected, and the second electrode of the first polarity free capacitor 309 is electrically connected with the second ground terminal 114；The
The ground terminal 3037 of two control chips 303 is electrically connected with the second ground terminal 114.Optionally, the switching tube of the second control chip 303
Emitter terminal 3038 is electrically connected with the second ground terminal 114.
In the present embodiment, the second control chip 303 can be illustratively active master control PWM chip, and model can be selected
Select TI MC33063A chips, the compatible boosting simultaneously of this chip and buck topology.The internal structure of active master control PWM chip
Include illustratively triode Q1 and Q2, clock oscillator OSC, comparator, reference power supply, rest-set flip-flop and NAND gate.Benchmark
The first end of power supply provides reference voltage for the electrode input end of comparator, and the second end of reference power supply is as the second control chip
303 ground terminal 3037.The voltage of comparator reverse input end 3035 provides voltage as the negative input of comparator.Compare
The output end of device provides electric signal for the first input end of NAND gate.The capacitance signal at timing capacitor end 3036 is clock oscillator
Capacitance signal, the current value at peak current detection end 3034 and the power supply signal input of clock oscillator, clock oscillation are provided
The electrical signal of device provides electric signal for the second input terminal of NAND gate, while providing electric signal for the ends R of rest-set flip-flop,
The S of rest-set flip-flop terminates the logical signal output end electrical connection into NAND gate, the control at the ends Q and triode Q2 of the vibrator of RS
End electrical connection, driving tube collector terminal of the triode Q2 collectors as the second control chip, the emitter of triode Q2 and three
The control terminal of pole pipe Q1 is electrically connected, the switching tube collector terminal 3033 of the collector of triode Q1 as the second control chip, and three
Switching tube emitter terminal 3038 of the emitter of pole pipe Q1 as the second control chip.
It should be noted that the first inductance 301, the 4th diode 302, second control chip 303 and quadripolarity capacitance
304 constitute boost chopper (Boost Chopper).When the switching tube conducting in the second control chip 303, the first inductance
301 are used for storage energy, and the anode of quadripolarity capacitance 304 can provide the second positive voltage for load, be illustratively+
15V.When the switching tube in the second control chip 303 is not turned on, the cathode output end of voltage transformation module 100 and the first inductance
301 load simultaneously to be electrically connected with 304 anode of quadripolarity capacitance provides the second forward voltage, thus quadripolarity capacitance is just
The voltage value high with the cathode output end numerical value of voltage transformation module can extremely be exported.Switching tube in second control chip 303
Shutdown and the frequency of conducting be known as the working frequency of chip.Capacitance by controlling the first polarity free capacitor 309 can be with
The working frequency of control the second control chip 303.By the resistance value for controlling the first divider resistance 307 and the second divider resistance 308
Can control comparator inverting input 3035 input voltage value, with control second control chip switching tube conducting or
Shutdown.Resistance value by controlling the second current-limiting resistance can control the maximum input current at peak current detection end 3034, with control
The working frequency of system the second control chip.The transistor collection for flowing through the second control chip interior is limited by the first current-limiting resistance
Electrode current.
Optionally, reversed boost module 400 includes the second inductance 401, the 5th diode 402,403 and of third control chip
5th polar capacitor 404；Third controls the switching tube of the driving tube collector terminal 4031 and third control chip 403 of chip 403
Collector 4032 is electrically connected；The driving tube collector terminal 4031 of third control chip 403 and the anode of voltage transformation module 100 are defeated
Outlet is electrically connected；Third controls the power supply signal input 4033 of chip 403 and the cathode output end electricity of voltage transformation module 100
Connection；The switching tube emitter terminal 4034 that the first end of second inductance 401 controls chip 403 with third is electrically connected；Second inductance
401 second end is electrically connected with third ground terminal 405；The cathode of 5th diode 402 and the first end of the second inductance 401 are electrically connected
It connects, the anode of the 5th diode 402 is electrically connected with the cathode of the 5th polar capacitor 404, the power supply as reversed boost module 400
Signal output end；The anode of 5th polar capacitor 404 is electrically connected with third ground terminal 405.Optionally, reversed boost module 400
Further include third current-limiting resistance 406, third divider resistance 407 and the 4th divider resistance 408；Third controls the driving of chip 403
Pipe collector 4031 is electrically connected with the first end of third current-limiting resistance 406, and second end and the voltage of third current-limiting resistance 406 are converted
The cathode output end of module 100 is electrically connected；Third controls the of chip peak point current electrical measurement end 4035 and third current-limiting resistance 406
One end is electrically connected；The first end of third divider resistance 407 is electrically connected with the anode of the 5th diode 402, third divider resistance 407
Second end be electrically connected with the first end of the 4th divider resistance 408, the second end of the 4th divider resistance 408 and third ground terminal
405 electrical connections；The comparator inverting input 4036 that the second end of third divider resistance 407 controls chip 403 with third is electrically connected
It connects.Optionally, reversed boost module 400 further includes the second polarity free capacitor 409；The first electrode of second polarity free capacitor 409
The timing capacitor end 4037 that chip 403 is controlled with third is electrically connected, and second electrode and the third of the second polarity free capacitor 409 divide
The first end of resistance 407 is electrically connected, and third controls the ground terminal 4038 of chip 403 and the second electricity of the second polarity free capacitor 409
Pole is electrically connected.
Illustratively, third control chip 403 can be illustratively active master control PWM chip, and model can select TI
MC33063A chips.
When the conducting of the switching tube of chip interior, the cathode of the second inductance storage energy, the 5th polar capacitor is born to this
The load of pole shop electrical connection provides energy.When the switching tube that third controls chip interior disconnects, diode current flow, the second inductance
Power supply signal -15V is provided to the load being electrically connected with the 5th polar capacitor cathode and the second polar capacitor.By controlling the second nothing
The capacitance of polar capacitor 409 can control the working frequency of third control chip 403.By controlling third divider resistance
407 and the 4th divider resistance 408 resistance value can control comparator inverting input 4036 input voltage value, to control third
Control the conducting or shutdown of the switching tube of chip.Resistance value by controlling third current resistor 406 can control peak point current
The maximum input current of test side 4035, with the working frequency of control the second control chip.
First inductance and the second inductance are designed using nickel-zinc ferrite surface mount elements, have the characteristics that volume small sensible weight is high.
The technical solution of the utility model can not only solve high-power inverter output current Sampling, but also simultaneously
Taking into account whole system reduces the advantage of power consumption.Due to selecting powerful pwm chip, it is possible to peripheral circuits
Design, and because select device to use patch part the volume and cost problem that newly-increased circuit will not be caused to bring.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment here, can carry out for a person skilled in the art various apparent
Change, readjust, be combined with each other and substitutes without departing from the scope of protection of the utility model.Therefore, although more than passing through
Embodiment is described in further detail the utility model, but the utility model is not limited only to above example,
Can also include other more equivalent embodiments in the case of not departing from the utility model design, and the scope of the utility model
It is determined by scope of the appended claims.
Claims (9)
1. a kind of Switching Power Supply of photovoltaic DC-to-AC converter, which is characterized in that including：
The first input end of voltage transformation module, the voltage transformation module is electrically connected with the first end of photovoltaic DC power supply, institute
The second input terminal for stating voltage transformation module is electrically connected with the second end of the photovoltaic DC power supply, the voltage transformation module
Cathode output end is for exporting the first positive voltage, and the cathode output end of the voltage transformation module is for exporting the first negative voltage；
Positive boost module, the power supply signal input and the anode of the voltage transformation module of the forward direction boost module export
End electrical connection, the power supply signal output end of the forward direction boost module are used to export absolute value and are more than the exhausted of first positive voltage
To the second positive voltage of value；
Reversed boost module, the power supply signal input of the reversed boost module are exported with the anode of the voltage transformation module
End electrical connection, the power supply signal output end of the reversed boost module are used to export absolute value exhausted more than first negative voltage
To the second negative voltage of value.
2. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 1, which is characterized in that
The voltage transformation module includes armature winding, the first secondary windings, second subprime winding and third secondary windings, described
The first end of second subprime winding and the first end of the third secondary windings are Same Name of Ends, the second of the second subprime winding
The second end of end and the third secondary windings is Same Name of Ends；
First secondary windings is connected with the second subprime windings in series.
3. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 2, which is characterized in that
The voltage transformation module further includes transistor, the first control chip, the first diode, the second diode, the three or two pole
Pipe, the first polar capacitor, the second polar capacitor and third polar capacitor；
The first end of the armature winding is electrically connected with the drain electrode of the transistor, the source electrode of the transistor and the first ground terminal
Electrical connection；
The control terminal of the transistor is electrically connected with the output end of the first control chip；
The source electrode of the transistor is electrically connected with the first end of the photovoltaic DC power supply, the second end of the armature winding and institute
State the second end electrical connection of photovoltaic DC power supply, the cathode electricity of the first end of first secondary windings and first diode
Connection, the anode of first diode are electrically connected with the cathode of first polar capacitor, and first polar capacitor is just
The second end of pole and first secondary windings is electrically connected, and is electrically connected with the second ground terminal；
The second end of first secondary windings is electrically connected with the first end of the second subprime winding, the second subprime winding
Second end be electrically connected with the anode of second diode, the cathode of second diode and second polar capacitor
Anode electrical connection, the cathode of second polar capacitor are electrically connected with the first end of the secondary windings, the second polarity electricity
The cathode of cathode output end of the anode of appearance as the voltage transformation module, first polar capacitor turns as the voltage
Change the mold the cathode output end of block；
The first end of the third secondary windings is electrically connected with first ground terminal, the first end of the third secondary windings with
The cathode of the third polar capacitor is electrically connected, and the cathode of the anode and the third diode of the third polar capacitor is electrically connected
It connects, the anode of the third diode is electrically connected with the second end of the third secondary windings, and the third polar capacitor is just
Pole is electrically connected with the power supply signal input of the first control chip.
4. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 1, which is characterized in that
The forward direction boost module includes the first inductance, the 4th diode, the second control chip and quadripolarity capacitance；
The driving tube collector terminal of the second control chip is electrically connected with the first end of first inductance, second control
The driving tube collector terminal of chip is electrically connected with the cathode output end of the voltage transformation module；
The power supply signal input of the second control chip is electrically connected with the cathode output end of the voltage transformation module；
The second end of first inductance is electrically connected with the switching tube collector terminal of the second control chip；
The second end of first inductance and it is described second control chip switching tube collector terminal respectively with the four or two pole
The anode of pipe is electrically connected, and the cathode of the 4th diode is electrically connected with the positive of the quadripolarity capacitance, as it is described just
To the power supply signal output end of boost module；
The cathode of the quadripolarity capacitance is electrically connected with the second ground terminal.
5. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 4, which is characterized in that
The forward direction boost module further includes the first current-limiting resistance, the second current-limiting resistance, the first divider resistance and the second partial pressure electricity
Resistance；
The driving pipe collector of the second control chip is electrically connected with the first end of first current-limiting resistance, first limit
The second end of leakage resistance is electrically connected with the first end of second current-limiting resistance, the second end of second current-limiting resistance with it is described
The cathode output end of voltage transformation module is electrically connected；
The peak current detection end of the second control chip is electrically connected with the second end of first current-limiting resistance；
The first end of first divider resistance is electrically connected with the cathode of the 4th diode, and the of first divider resistance
Two ends are electrically connected with the first end of second divider resistance, the second end of second divider resistance and second ground terminal
Electrical connection；
The second end of first divider resistance is electrically connected with the comparator inverting input of the second control chip.
6. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 4, which is characterized in that
The forward direction boost module further includes the first polarity free capacitor；
The first electrode of first polarity free capacitor is electrically connected with the timing capacitor end of the second control chip, and described first
The second electrode of polarity free capacitor is electrically connected with second ground terminal；
The ground terminal of the second control chip is electrically connected with second ground terminal.
7. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 1, which is characterized in that
The reversed boost module includes the second inductance, the 5th diode, third control chip and the 5th polar capacitor；
The switch pipe collector that the driving tube collector terminal of the third control chip controls chip with the third is electrically connected；
The driving tube collector terminal of the third control chip is electrically connected with the cathode output end of the voltage transformation module；
The power supply signal input of the third control chip is electrically connected with the cathode output end of the voltage transformation module；
The switching tube emitter terminal that the first end of second inductance controls chip with the third is electrically connected；
The second end of second inductance is electrically connected with third ground terminal；
The cathode of 5th diode is electrically connected with the first end of second inductance, the anode of the 5th diode and institute
State the cathode electrical connection of the 5th polar capacitor, the power supply signal output end as the reversed boost module；5th polarity
The anode of capacitance is electrically connected with the third ground terminal.
8. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 7, which is characterized in that
The reversed boost module further includes third current-limiting resistance, third divider resistance and the 4th divider resistance；
The driving pipe collector of the third control chip is electrically connected with the first end of the third current-limiting resistance, the third limit
The second end of leakage resistance is electrically connected with the cathode output end of the voltage transformation module；
Third control chip peak point current electrical measurement end is electrically connected with the first end of the third current-limiting resistance；
The first end of the third divider resistance is electrically connected with the anode of the 5th diode, and the of the third divider resistance
Two ends are electrically connected with the first end of the 4th divider resistance, second end and the third ground terminal of the 4th divider resistance
Electrical connection；
The comparator inverting input that the second end of the third divider resistance controls chip with the third is electrically connected.
9. the Switching Power Supply of photovoltaic DC-to-AC converter according to claim 8, which is characterized in that
The reversed boost module further includes the second polarity free capacitor；
The timing capacitor end that the first electrode of second polarity free capacitor controls chip with the third is electrically connected, and described second
The second electrode of polarity free capacitor is electrically connected with the first end of the third divider resistance,
The ground terminal of the third control chip is electrically connected with the second electrode of second polarity free capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820253106.6U CN208063051U (en) | 2018-02-12 | 2018-02-12 | A kind of Switching Power Supply of photovoltaic DC-to-AC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820253106.6U CN208063051U (en) | 2018-02-12 | 2018-02-12 | A kind of Switching Power Supply of photovoltaic DC-to-AC converter |
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| CN208063051U true CN208063051U (en) | 2018-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861507A (en) * | 2018-12-21 | 2019-06-07 | 成都信息工程大学 | A kind of dual power supply conversion method, circuit and power protection method and circuit |
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2018
- 2018-02-12 CN CN201820253106.6U patent/CN208063051U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109861507A (en) * | 2018-12-21 | 2019-06-07 | 成都信息工程大学 | A kind of dual power supply conversion method, circuit and power protection method and circuit |
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Granted publication date: 20181106 Termination date: 20200212 |