CN208836018U - High-power high-frequency power parallel machine current equalizer - Google Patents
High-power high-frequency power parallel machine current equalizer Download PDFInfo
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- CN208836018U CN208836018U CN201821766427.2U CN201821766427U CN208836018U CN 208836018 U CN208836018 U CN 208836018U CN 201821766427 U CN201821766427 U CN 201821766427U CN 208836018 U CN208836018 U CN 208836018U
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- pwm signal
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- flow equalizing
- driving circuit
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Abstract
The utility model discloses a kind of high-power high-frequency power parallel machine current equalizer, including sequentially connected air switch, three-phase rectification bridge, IGBT module, high frequency transformer, current divider and control unit, current divider and load are connected；Control unit includes: single-chip microcontroller；Control interface is connect with current divider and pwm signal input terminal, and output end is connected to flow equalizing circuit and pwm signal driving circuit；Flow equalizing circuit is all connected with, output feedback signal to pwm signal driving circuit with bus, single-chip microcontroller, control interface is flowed；Pwm signal driving circuit, is coupled to control interface and flow equalizing circuit, and output end is coupled to IGBT module；Power module is single-chip microcontroller, control interface, flow equalizing circuit and flow equalizing circuit power supply；By control interface and flow equalizing circuit is carried out to multiple power supplys and machine flows, and exports uniform current so that the system simultaneously after machine is relatively stable and extends the service life of power supply.
Description
Technical field
The utility model relates to power supply control technology fields, more specifically, it relates to which a kind of high-power high-frequency power supply is simultaneously
Machine current equalizer.
Background technique
Such as be electroplated in electrochemical industry, be electrolysed, electrophoretic coating, low temperature cross the application that iron needs high current, usually
Big DC power supply is needed, to provide power supply for heavy load.Multiple power module parallel outputs are to solve high-power out-put supply
One of optimal case of design.Due to power sources in parallel have compatibility it is strong, can N+m redundancy backup, highly reliable, cost performance is high,
A series of advantages such as design difficulty is lower, is easily managed, power module parallel technology in the continuous improvement and development, and at
For the core technology of high-power distributed generation resource.And the core of power module parallel connection, then it is the simultaneously equal Flow Technique of machine.Flow skill
Art refers in multiple power module parallel connections, uniformly distributes the measure of each power module load current, while meeting output
Voltage keeps relative stability in input voltage and output curent change, and to have preferable stream precision and transient state to ring
It answers.
But the major defect of common control circuit is: after multi-group power and machine, cannot reach good stream effect
Fruit can generally generate following consequence:
1) after starting, every group of electric power outputting current is inconsistent, and the output larger power module service life of electric current is short, causes whole
A power-supply system is highly unstable to be easily damaged；
2) it when the power fails, will lead to whole production line halt production, maintenance is inconvenient and the time is longer.
Utility model content
In view of the deficienciess of the prior art, the purpose of this utility model is to provide a kind of high-power high-frequency power parallel machines
Current equalizer carries out autonomous equalizing current to multiple power modules by control interface and flow equalizing circuit, exports uniform current, make
System after obtaining simultaneously machine is relatively stable, extends the service life of power supply.
To achieve the above object, the utility model provides following technical solution:
A kind of high-power high-frequency power parallel machine current equalizer, including be sequentially connected electrically air switch, three-phase rectification bridge,
The input terminal of IGBT module, high frequency transformer, current divider and control unit, air switch is connect with power grid, current divider output end
It is connected with load；Described control unit includes:
Single-chip microcontroller；
Control interface is connect with the output end of current divider, pwm signal input terminal, and output end is connected to equal galvanic electricity
Road and pwm signal driving circuit, for controlling the operation of flow equalizing circuit and pwm signal driving circuit；
Flow equalizing circuit is all connected with bus, single-chip microcontroller, control interface is flowed, for being flowed to input signal,
And export the output signal that feedback signal controls pwm signal driving circuit to pwm signal driving circuit；
Pwm signal driving circuit is coupled to control interface and flow equalizing circuit to receive feedback signal, output end coupling
The output signal of IGBT module is controlled in IGBT module；
Power module is the single-chip microcontroller, control interface, flow equalizing circuit and flow equalizing circuit power supply.
Further, the control interface includes:
The pwm signal output end of two pwm signal interface ends, input terminal and single-chip microcontroller connects, and output end, which is coupled to, to flow
Circuit and pwm signal driving circuit are to control the output of flow equalizing circuit and pwm signal driving circuit.
Further, the flow equalizing circuit includes:
Flow equalizing circuit is isolated, input terminal is coupled to one of contact of relay and current divider, output end are coupled to PWM
Signal drive circuit；
Current-limiting circuit, input terminal are coupled to the pwm signal output end of current divider and single-chip microcontroller, and output end is coupled to PWM letter
Number driving circuit；
The output signal of the current-limiting circuit carries out main regulation control, the equal galvanic electricity of isolation to pwm signal driving circuit
Road carries out auxiliary adjusting to pwm signal driving circuit and controls.
Further, the isolation flow equalizing circuit includes that UC3907 flows chip, and 15 pins, which are coupled to, flows bus, and 14
Pin is coupled to pwm signal driving circuit, and 2 pins are coupled to current divider, by the signal of current divider acquisition and the letter for flowing bus
It number is flowed by UC3907 after chip is compared, outputs signal to pwm signal driving circuit to the defeated of pwm signal driving circuit
Stream is carried out out to adjust.
Further, the current-limiting circuit includes comparator U5B, and non-inverting input terminal is coupled to current divider to receive acquisition
Signal, inverting input terminal are coupled to the pwm signal output end of single-chip microcontroller, and output end is coupled to pwm signal driving circuit to drive
Pwm signal drive circuit works, and connected between inverting input terminal and output end by capacitor 507.
Further, the flow equalizing circuit further include: two are flowed bus interface end, are connect with stream bus, Jiang Duotai
And machine current equalizer is attached；And its output end is coupled to flow equalizing circuit to control the output of flow equalizing circuit.
Further, two output ends for flowing bus interface end are in series with the switch electricity with the coupling of the port of single-chip microcontroller
Input of the bus to flow equalizing circuit is flowed to control in road；The switching circuit includes:
Triode Q701, base stage are coupled to the output end of single-chip microcontroller, grounded collector, and emitter is coupled to relay
Coil is connected with capacitor C703 between collector and emitter；
Relay, including coil and two contacts, coil one end are coupled to the emitter of triode Q701, another termination
Power supply；The normally opened contact of two contacts be respectively coupled to two flow bus interface ends, common end be connected to reference to and
Flow equalizing circuit, to control the output of flow equalizing circuit.
Further, voltage follower circuit is provided between the isolation flow equalizing circuit and the pwm signal driving circuit
And optocoupler, the voltage follower circuit are coupled to 14 pins that UC3907 flows chip, output end is coupled to luminous the two of optocoupler
The anode of pole pipe, the cathode of light emitting diode are coupled to reference to ground, and collector is coupled to pwm signal driving circuit, and emitter connects
Ground.
Further, the current divider and UC3907, which flow, is provided with voltage amplifier, voltage between 15 pins of chip
The input terminal of amplifier is coupled to signal of the current divider to amplify current divider acquisition, and output end is coupled to pwm signal driving electricity
Road and steadily output voltage are to control pwm signal driving circuit.
Further, the single-chip microcontroller uses ATMEGA8.
Compared with prior art, the utility model has the advantages that:
1, simultaneously machine is carried out to multiple power supplys by control interface and flow equalizing circuit to flow, export uniform current, so that
And the system after machine is relatively stable, extends the service life of power supply:, need to when several power supplys are by stream bus and machine connection
After the voltage and current input wanted, electric current is flowed by flow equalizing circuit, no matter and power supply how many platform for accessing, can
Reach autonomous equalizing current purpose.And flow equalizing circuit can be finely adjusted section to PWM drive circuit, meanwhile, by single-chip microcontroller 540
Pwm signal carries out main regulation to PWM drive circuit, so that the voltage and current in PWM drive circuit input IGBT module is more
Add equalization stable, extends the service life of power supply；
2, scene neatly expands or reduces the capacity of switch power supply system, and each power module automatic average exports electric current；
3, the setting of current sharing interface circuit realizes that unified standard metaplasia produces；
4, composition parallel redundant system, can be very convenient when individual module breaks down to improve reliability of operation
Replaced or repaired, reduce equipment operation and after-sales service cost.
Detailed description of the invention
Fig. 1 is the integrated circuit block diagram of the utility model；
Fig. 2 is the circuit diagram of single-chip microcontroller；
Fig. 3 is the circuit diagram of control interface；
Fig. 4 is the circuit diagram that flow equalizing circuit is isolated；
Fig. 5 is the circuit diagram of current-limiting circuit；
Fig. 6 is the circuit diagram of voltage follower circuit and optocoupler；
Fig. 7 is the circuit diagram of voltage amplifier；
Fig. 8 is the circuit diagram of pwm signal circuit；
Fig. 9 is the circuit diagram of pwm signal driving circuit；
Figure 10 is the circuit diagram of power module.
Appended drawing reference: 100, air switch；200, three-phase rectification bridge；300, IGBT module；400, high frequency transformer；500,
Control unit；510, current divider；520, flow equalizing circuit；521, flow equalizing circuit is isolated；522, current-limiting circuit；530, control interface electricity
Road；540, single-chip microcontroller；550, pwm signal driving circuit；560, power module；600, auxiliary transformer is controlled；700, LCD is shown
Device.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
A kind of high-power high-frequency power parallel machine current equalizer, referring to Fig.1, including the air switch 100, three being sequentially connected electrically
Commutating phase bridge 200, IGBT module 300, high frequency transformer 400, current divider 510 and control unit 500, air switch 100 it is defeated
Enter end to connect with power grid, the output end of high frequency transformer 400 and load connect；Also, it is also electric in the output end of air switch 100
It is connected with control auxiliary transformer 600, the output end of control auxiliary transformer 600 is coupled to control unit 500.Power grid uses
AC380V or AC220V is rectified into direct current by air switch 100 and three-phase rectification bridge 200, by 300 frequency conversion of IGBT module,
Power conversion is carried out using high frequency transformer 400, direct current output carries out being output to after signal acquisition into current divider 510 negative
It carries.Simultaneously by the power supply after air switch 100 by reaching control unit 500 after auxiliary transformer, supplied for control unit 500
Electricity.In addition, external equipment is communicated to connect by 485 communications with control unit 500.External equipment can be used LCD display 700 or
Keyboard or computer.
Control unit 500 includes single-chip microcontroller 540, control interface 530, flow equalizing circuit 520, pwm signal driving circuit
550 and power module 560.The input terminal and current divider of control interface 530, the pwm signal input terminal of single-chip microcontroller 540 connect
It connects, output end is connected to flow equalizing circuit 520, can be used for controlling the operation of flow equalizing circuit 520.Flow equalizing circuit 520 and stream bus,
Single-chip microcontroller 540, control interface 530 are all connected with, and for being flowed to input signal, and are exported feedback signal to control and are connect
Mouthful circuit 530 is to control the output signal of pwm signal driving circuit 550.Pwm signal driving circuit 550 is coupled to flow equalizing circuit
520 and control interface 530 to receive feedback signal, output end is coupled to IGBT module 300 to control IGBT module 300
Output signal；Power module 560 is that single-chip microcontroller 540, control interface 530, flow equalizing circuit 520 and flow equalizing circuit 520 are powered.
In the present embodiment, referring to Fig. 2, single-chip microcontroller 540 uses ATMEGA8.
Referring to Fig. 3, control interface 530 includes two pwm signal interface ends, two pwm signal interface end input terminals
It being connect with the pwm signal output end of single-chip microcontroller 540, output end is respectively coupled to after concatenated diode connection point rectified,
Flow equalizing circuit 520 and pwm signal driving circuit 550 are outputed signal to control the output of flow equalizing circuit 520 and pwm signal and drive
The output of dynamic circuit 550.
In addition, being set side by side with two pwm signal interface ends there are two bus interface end is flowed, two are flowed bus interface
End is connect with stream bus, and by more and machine current equalizer is attached；And its output end is coupled to by switching circuit and is flowed
Circuit 520 is to control the output of flow equalizing circuit 520.The port of switching circuit and single-chip microcontroller 540 couples, including triode Q701 and
Relay, the base stage of triode Q701 are coupled to the output end of single-chip microcontroller 540, grounded collector, and emitter is coupled to relay
Coil, capacitor C703 is connected between collector and emitter；Relay includes coil and two contacts, coil one end coupling
It is connected to the emitter of triode Q701, another termination power；The normally opened contact of two contacts is respectively coupled to two and flows bus
Interface end, common end is connected to, and it is equal to reach protection to control the output of flow equalizing circuit 520 with flow equalizing circuit 520 with referring to
The effect of current circuit 520.
When the port of single-chip microcontroller 540 exports low level signal, the coil of triode Q701 conducting, relay is powered, will
Two contact closures, so that bus and flow equalizing circuit 520 are flowed in conducting.The setting of the switching circuit, can be in the moment that is powered to electricity
It is pressed into row buffering, carries out the signal transmission for flowing bus, again when voltage steadily conveys to reach the mesh of protection flow equalizing circuit 520
, improve the service life of power supply entirety.
Referring to Fig. 4 and Fig. 5, flow equalizing circuit 520 further includes isolation flow equalizing circuit 521 and current-limiting circuit 522, and equal galvanic electricity is isolated
The input terminal on road 521 is coupled to one of contact and the current divider 510 of relay, and output end is coupled to pwm signal driving electricity
Road 550；The input terminal of current-limiting circuit 522 is coupled to the pwm signal output end of current divider 510 and single-chip microcontroller 540, output end coupling
In pwm signal driving circuit 550；Wherein, the output signal of current-limiting circuit 522 carries out main regulation to pwm signal driving circuit 550
Control, isolation flow equalizing circuit 521 carry out auxiliary adjusting to pwm signal driving circuit 550 and control.
Isolation flow equalizing circuit 521 includes that UC3907 flows chip, and 15 pins are coupled to stream bus, 14 pins and are coupled to
550,2 pin of pwm signal driving circuit is coupled to current divider 510, the signal that current divider 510 is acquired and the signal for flowing bus
It is flowed by UC3907 after chip is compared, outputs signal to pwm signal driving circuit 550 to pwm signal driving circuit 550
Output carry out stream adjust.
Current-limiting circuit 522 includes comparator U5B, and non-inverting input terminal is coupled to point by the slide rheostat VR1 of connection
Device 510 is flowed to receive acquisition signal, and inverting input terminal is coupled to the pwm signal output end of single-chip microcontroller 540, and output end passes through connection
Diode D502 be coupled to pwm signal driving circuit 550 with drive pwm signal driving circuit 550 work；And inverting input terminal
It is connect between output end by capacitor 507, achievees the effect that signal is fed back, the acquisition signal and PWM for improving current divider 510 are believed
The accuracy compared between number.
In addition, referring to Fig. 6, in order to improve the resiliency and isolation of input pwm signal driving circuit 550, so that input
Voltage in pwm signal driving circuit 550 is more stable, between isolation flow equalizing circuit 521 and pwm signal driving circuit 550
It is provided with voltage follower circuit and optocoupler U7, voltage follower circuit is coupled to 14 pins that UC3907 flows chip, output end coupling
It is connected to the anode of the light emitting diode of optocoupler U7, the cathode of light emitting diode is coupled to reference to ground, and collector is coupled to pwm signal
Driving circuit 550, emitter ground connection.
Referring to Fig. 7, current divider 510 and UC3907, which flow, is provided with voltage amplifier between 15 pins of chip, and voltage is put
The input terminal of big device is coupled to signal of the current divider 510 to amplify the acquisition of current divider 510, and output end is coupled to pwm signal drive
Dynamic circuit 550 and steadily output voltage are to control pwm signal driving circuit 550.
It is the circuit diagram of pwm signal driving circuit 550 referring to Fig. 8 and Fig. 9, wherein Fig. 8 shows pwm signal circuit,
Fig. 9 indicates pwm signal driving circuit 550, and details are not described herein again.As shown in Figure 10, above-mentioned unit, module, component, circuit,
The voltage of chip or element is provided by power module 560, and since it is more conventional, details are not described herein again.
When several power supplys are by stream bus and machine connection, after the input of required voltage electric current, pass through flow equalizing circuit
520 pairs of electric currents are flowed, no matter and access power supply how many platform, can reach stream purpose.And flow equalizing circuit 520
Section can be finely adjusted to PWM drive circuit, meanwhile, PWM drive circuit is carried out by the pwm signal of single-chip microcontroller 540 main
Regulation, so that the more balanced stabilization of voltage and current in PWM drive circuit input IGBT module 300, extend power supply uses the longevity
Life.
The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.It should refer to
Out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (10)
1. a kind of high-power high-frequency power parallel machine current equalizer, which is characterized in that including the air switch being sequentially connected electrically
(100), three-phase rectification bridge (200), IGBT module (300), high frequency transformer (400), current divider (510) and control unit
(500), the input terminal of air switch (100) is connect with power grid, and the output end of current divider (510) and load connect；The control
Unit (500) includes:
Single-chip microcontroller (540)；
Control interface (530) is connect with the output end of current divider (510), pwm signal input terminal, and output end is connected to
Flow equalizing circuit (520) and pwm signal driving circuit (550), for controlling flow equalizing circuit (520) and pwm signal driving circuit
(550) operation；
Flow equalizing circuit (520) is all connected with bus, single-chip microcontroller (540), control interface (530) is flowed, for believing input
It number is flowed, and exports feedback signal to pwm signal driving circuit (550) to control the defeated of pwm signal driving circuit (550)
Signal out；
Pwm signal driving circuit (550) is coupled to control interface (530) and flow equalizing circuit (520) to receive feedback letter
Number, output end is coupled to IGBT module (300) to control the output signal of IGBT module (300)；
Power module (560) is the single-chip microcontroller (540), control interface (530), flow equalizing circuit (520) and flow equalizing circuit
(520) it powers.
2. high-power high-frequency power parallel machine current equalizer according to claim 1, which is characterized in that the control interface electricity
Road (530) includes:
Two pwm signal interface ends, input terminal are connect with the pwm signal output end of single-chip microcontroller (540), and output end, which is coupled to, to flow
Circuit (520) and pwm signal driving circuit (550) are to control the defeated of flow equalizing circuit (520) and pwm signal driving circuit (550)
Out.
3. high-power high-frequency power parallel machine current equalizer according to claim 2, which is characterized in that the flow equalizing circuit
(520) include:
It is isolated flow equalizing circuit (521), input terminal is coupled to one of contact and the current divider (510) of relay, output end coupling
It is connected to pwm signal driving circuit (550)；
Current-limiting circuit (522), input terminal are coupled to the pwm signal output end of current divider (510) and single-chip microcontroller (540), output end
It is coupled to pwm signal driving circuit (550)；
The output signal of the current-limiting circuit (522) carries out main regulation control, the isolation to pwm signal driving circuit (550)
Flow equalizing circuit (521) carries out auxiliary adjusting to pwm signal driving circuit (550) and controls.
4. high-power high-frequency power parallel machine current equalizer according to claim 3, which is characterized in that the equal galvanic electricity of isolation
Road (521) includes that UC3907 flows chip, and 15 pins are coupled to stream bus, 14 pins and are coupled to pwm signal driving circuit
(550), 2 pins are coupled to current divider (510), and the signal of current divider (510) acquisition is passed through with the signal for flowing bus
UC3907 flows after chip is compared, and outputs signal to pwm signal driving circuit (550) to pwm signal driving circuit (550)
Output carry out stream adjust.
5. high-power high-frequency power parallel machine current equalizer according to claim 4, which is characterized in that the current-limiting circuit
It (522) include comparator U5B, non-inverting input terminal is coupled to current divider (510) to receive acquisition signal, inverting input terminal coupling
In the pwm signal output end of single-chip microcontroller (540), output end is coupled to pwm signal driving circuit (550) to drive pwm signal to drive
Dynamic circuit (550) work, and connected between inverting input terminal and output end by capacitor 507.
6. high-power high-frequency power parallel machine current equalizer according to claim 3, which is characterized in that the flow equalizing circuit
(520) further include: two are flowed bus interface end, are connect with stream bus, and by more and machine current equalizer is attached；And its
Output end is coupled to flow equalizing circuit (520) to control the output of flow equalizing circuit (520).
7. high-power high-frequency power parallel machine current equalizer according to claim 4, which is characterized in that two stream buses connect
The output end at mouth end is in series with the switching circuit with the port of single-chip microcontroller (540) coupling, flows bus to flow equalizing circuit to control
(520) input；The switching circuit includes:
Triode Q701, base stage are coupled to the output end of single-chip microcontroller (540), grounded collector, and emitter is coupled to relay
Coil, capacitor C703 is connected between collector and emitter；
Relay, including coil and two contacts, coil one end are coupled to the emitter of triode Q701, another termination electricity
Source；The normally opened contact of two contacts is respectively coupled to two and flows bus interface ends, and common end is with being connected to reference and equal
Current circuit (520), to control the output of flow equalizing circuit (520).
8. high-power high-frequency power parallel machine current equalizer according to claim 5, which is characterized in that the equal galvanic electricity of isolation
Voltage follower circuit and optocoupler, the voltage follow electricity are provided between road (521) and the pwm signal driving circuit (550)
Road is coupled to 14 pins that UC3907 flows chip, and output end is coupled to the anode of the light emitting diode of optocoupler, light emitting diode
Cathode be coupled to reference to ground, collector is coupled to pwm signal driving circuit (550), emitter ground connection.
9. high-power high-frequency power parallel machine current equalizer according to claim 8, which is characterized in that the current divider
(510) it flows with UC3907 and is provided with voltage amplifier between 15 pins of chip, the input terminal of voltage amplifier is coupled to point
Signal of stream device (510) to amplify current divider (510) acquisition, it is simultaneously steady that output end is coupled to pwm signal driving circuit (550)
Output voltage is to control pwm signal driving circuit (550).
10. high-power high-frequency power parallel machine current equalizer according to claim 1, which is characterized in that the single-chip microcontroller
(540) ATMEGA8 is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821766427.2U CN208836018U (en) | 2018-10-29 | 2018-10-29 | High-power high-frequency power parallel machine current equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821766427.2U CN208836018U (en) | 2018-10-29 | 2018-10-29 | High-power high-frequency power parallel machine current equalizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208836018U true CN208836018U (en) | 2019-05-07 |
Family
ID=66319720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821766427.2U Expired - Fee Related CN208836018U (en) | 2018-10-29 | 2018-10-29 | High-power high-frequency power parallel machine current equalizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208836018U (en) |
-
2018
- 2018-10-29 CN CN201821766427.2U patent/CN208836018U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
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| CF01 | Termination of patent right due to non-payment of annual fee |