CN207382186U - Direct-current dual power starts and switching current-limiting circuit - Google Patents
Direct-current dual power starts and switching current-limiting circuit Download PDFInfo
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- CN207382186U CN207382186U CN201721148531.0U CN201721148531U CN207382186U CN 207382186 U CN207382186 U CN 207382186U CN 201721148531 U CN201721148531 U CN 201721148531U CN 207382186 U CN207382186 U CN 207382186U
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Abstract
It is started the utility model is related to a kind of direct-current dual power and switches current-limiting circuit; two-way DC power supply is connected respectively by respective contactor with starting/switching current limiting unit; starting/switch unit is made of IGBT Q1 and peak voltage absorbing circuit; absorbing circuit absorbs the due to voltage spikes that stray inductance generates on DC power supply power transmission line, and protection IGBT Q1 are unlikely to excessive pressure damages.Dash current in two-way DC power supply handoff procedure can inhibit using the utility model, while taken into account operating mode when inverter starts, inhibit inrush current, additional soft starting circuit can be saved.The utility model control strategy is simple, it can be achieved that contactor is without circuit closed and disengagement, and reliable operation has a good application prospect.
Description
Technical field
The utility model is related to a kind of Power Electronic Technique, more particularly to a kind of direct-current dual power suitable for inverter
It starts and switches current-limiting circuit.
Background technology
Converting direct-current power into alternating-current power is the load supplying of small grids by inverter, and to ensure reliability, direct current is defeated
Enter frequently with two-way DC power supply, all the way to be primary, all the way to be spare.When primary power cource powers off, standby electricity is automatically switched to
Source, the conversion of two power supplys do not influence inverter normal work.In off-position input power is required to realize electricity with inverter
Air bound is from the case of, and generally use contactor is as switching switch, and contactor actuation time is usually longer, in order to make inversion
Significantly power down does not occur within this unpowered time for power source bus capacitance, and bus capacitor requirement has sufficiently large capacity, that
The operating mode Down Highway capacitance that input DC power is switched to high pressure by low pressure can recharge, and generate larger dash current,
Easily trip.
The content of the invention
The utility model be for existing frequently-used direct current change-over switch there are the problem of, it is proposed that a kind of direct-current dual power
It starts and switches current-limiting circuit, inhibit the dash current in two-way DC power supply handoff procedure.
The technical solution of the utility model is：A kind of direct-current dual power starts and switching current-limiting circuit, the input of two-way direct current
For power supply I and II to inverter power supply, DC power supply I outputs are connected to contactor I, and DC power supply II outputs are connected to contactor II,
The output-parallel of contactor I and contactor II to same point are followed by starting and switching current limiting unit, are started and are cut
The output for changing current limiting unit is connected to inverter dc-link capacitance；
Gather the contact feedback letter of the output voltage signal of DC power supply I and DC power supply II, contactor I and contactor II
It number send to control algolithm circuit, control algolithm circuit, which generates contactor control signal and send to current limliting, realizes circuit and contactor control
Circuit, starts and switching current limiting unit includes IGBT Q1 and voltage peak absorbing circuit in parallel, inverter input current letter
Number as value of feedback send current limliting realize circuit, current limliting realize circuit generate IGBT Q1 control signals to start and switch current limliting list
Member.
The voltage peak absorbing circuit is by the first capacitance C1, the second capacitance C2, first resistor R1, the first diode D1 groups
Into；First capacitance C1 is parallel to IGBT Q1 collector and emitters both ends；Mono- ends of first resistor R1 are connected to IGBT Q1 collectors,
The other end is connected with one end of the second capacitance C2, another emitter for being terminated at IGBT Q1 of the second capacitance C2；First diode
D1 is parallel to first resistor R1 both ends, and the anode of D1 is connected with the collector of IGBT Q1.
The current limliting realizes that circuit includes comparator N1, d type flip flop N2, second resistance R2,3rd resistor R3, the two or two pole
Pipe D2, the 3rd diode D3 and IGBT drive circuit；
Input current value of feedback is sent into comparator N1 forward ends, and current limliting reference value is sent into comparator negative end, comparator N1
Output terminal is pulled to power Vcc by 3rd resistor R3；3rd diode D3 anodes are connected with comparator N1 output terminals, D3 cathodes
Connect with d type flip flop N2 set ends S-phase；The d type flip flop that second diode D2 anodes connect the generation of control algolithm circuit is enabled and blocked
Signal, D2 cathodes are connected with the 3rd diode D3 cathodes；Second resistance R2 mono- terminates d type flip flop N2 set ends S, another termination
Ground；D type flip flop N2 clock ends CK connects the square-wave signal of a fixed frequency, reset terminal R ground connection, and data input pin D is grounded, and reverse phase is defeated
Outlet Qn is sent to IGBT drive circuit.
The beneficial effects of the utility model are：The utility model direct-current dual power starts and switching current-limiting circuit, can press down
Dash current in two-way DC power supply handoff procedure processed, while operating mode when inverter starts has been taken into account, inhibit to start punching
Electric current is hit, additional soft starting circuit can be saved.The utility model control strategy is simple, it can be achieved that contactor is without circuit closed
And disengagement, reliable operation have a good application prospect.
Description of the drawings
Fig. 1 for the utility model direct-current dual power starts and switches current-limiting circuit structure diagram；
Fig. 2 for the utility model direct-current dual power starts and switches current-limiting circuit control schematic diagram；
Fig. 3 realizes circuit diagram for the utility model current limliting；
Fig. 4 starts current-limiting circuit oscillogram for the utility model direct-current dual power；
Fig. 5 switches current-limiting circuit oscillogram for the utility model direct-current dual power.
Specific embodiment
Direct-current dual power starts and switches current-limiting circuit structure and control schematic diagram as depicted in figs. 1 and 2, and circuit includes two
Road direct-current input power supplying I and II, two-way power supply are connected to contactor I, DC power supply II to inverter power supply, DC power supply I outputs
Output-parallel to the same point that output is connected to contactor II, contactor I and contactor II is followed by starting and switching current limiting unit
101, it starts and the output of switching current limiting unit 101 is connected to inverter dc-link capacitance.Gather DC power supply I and direct current
The contact feedback signal of the output voltage signal of source II, contactor I and contactor II is sent to control algolithm circuit, control algolithm electricity
Road generation contactor control signal, which is sent to current limliting, realizes that circuit and contactor control circuit, inverter input current signal send limit
Stream realizes circuit, and current limliting realizes that circuit generates IGBT control signals to starting and switching current limiting unit 101, eventually by control
The switch motion of IGBT and contactor are coordinated to inhibit the dash current for starting with generating during power supply switching.
Direct-current dual power is started and switched in current-limiting circuit, the parasitism on DC power supply I and DC power supply II output cables
Inductance be can not ignore, and be equivalent to the first inductance L1 and the second inductance L2 respectively.
It starts and switching current limiting unit 101 includes IGBT Q1 in parallel and voltage peak absorbing circuit 102.Due to voltage spikes
Absorbing circuit 102 is made of the first capacitance C1, the second capacitance C2, first resistor R1, the first diode D1.First capacitance C1 is simultaneously
It is coupled to IGBT Q1 collector and emitters both ends；Mono- ends of first resistor R1 are connected to IGBT Q1 collectors, the other end and the second electricity
The one end for holding C2 is connected, another emitter for being terminated at IGBT Q1 of the second capacitance C2；First diode D1 is parallel to the first electricity
R1 both ends are hindered, and the anode of D1 is connected with the collector of IGBT Q1.
Current limliting as shown in Figure 3 realizes 103 schematic diagram of circuit, and current limliting realizes that circuit 103 includes comparator N1, d type flip flop N2,
Second resistance R2,3rd resistor R3, the second diode D2, the 3rd diode D3 and IGBT drive circuit.Input current value of feedback
Comparator N1 forward ends are sent into, current limliting reference value is sent into comparator negative end, and comparator N1 output terminals pass through on 3rd resistor R3
It is pulled to power Vcc；3rd diode D3 anodes are connected with comparator N1 output terminals, D3 cathodes and d type flip flop N2 set end S-phase
Even；The d type flip flop that second diode D2 anodes connect the generation of control algolithm circuit enables and locking signal, D2 cathodes and the three or two pole
Pipe D3 cathodes are connected；Second resistance R2 mono- terminates d type flip flop N2 set end S, other end ground connection；D type flip flop N2 clock ends CK connects
The square-wave signal of one fixed frequency, reset terminal R ground connection, data input pin D ground connection, reversed-phase output Qn send to IGBT and drive electricity
Road.
The utility model inhibits dash current using the starting and current limliting switch unit 101, and realization method is：
IGBT Q1 work in the on off state of fixed frequency, turn off IGBT Q1 when dash current reaches setting value, make input current
Decline, open IGBT Q1 again when next cycles arrive.
In view of DC power supply power transmission line there are stray inductance effect, the starting and current limliting switch unit 101 also include
Peak voltage absorbing circuit 102, the first capacitance C1 are parallel to IGBT Q1 both ends, absorb switching noise；It is turned off in IGBT Q1
Afterwards, the first inductance L1 or the second inductance L2 charges by the first diode D1 afterflows, and to the second capacitance C2, and the second capacitance C2 makes
Voltage when obtaining IGBT Q1 shut-offs realizes slow liter, IGBT Q1 is protected to be unlikely to excessive pressure damages, the IGBT Q1 lower cycles are open-minded
When, the energy stored on the second capacitance C2 is consumed by first resistor R1.
Control algolithm circuit output d type flip flop enables and locking signal, passes through the second diode D2 and d type flip flop N2 set
S-phase is held to connect, locking signal is high level, and enable signal is low level, shutdown or control algolithm circuit provides height during error protection
Level locking signal, the second diode D2 conductings, d type flip flop N2 set ends S is pulled to high level, by d type flip flop operation principle
It understands Qn output low level signals, IGBT is turned off.Control algolithm circuit provides low level and enables letter when start or switch operating
Number, the working condition of d type flip flop is determined that the course of work in one switch periods is as follows by the output state of comparator N1：
It samples obtained input current value of feedback to send to comparator N1 positive inputs, the current limliting reference value of setting, which is sent to comparator N1, to be born
To input terminal, comparator N1 output terminals are connected by the 3rd diode D3 and d type flip flop N2 set ends S-phase, when current feedback values are big
When current limliting setting value, comparator N1 output high level, the 3rd diode D3 conductings, the supreme electricity of d type flip flop N2 set ends S pull-up
It is flat, Qn output low level signals are understood by d type flip flop operation principle, IGBT Q1 are turned off, after IGBT Q1 shut-offs, input current
It begins to decline, when current feedback values are less than current limliting setting value, comparator N1 output low levels, the 3rd diode D3 ends, and D is touched
Hair device N2 set ends S is pulled down to low level, and when the next high level of d type flip flops N2 clock ends CK arrives, Qn is believed by low level
For high level signal, IGBT Q1 are open-minded again for number overturning.After several switch periods, inverter bus capacitor charging complete,
Input current value of feedback is consistently less than current limliting reference value, and Qn is always high level signal, and IGBT Q1 remain conducting state.
It is assumed that the voltage value of DC power supply II is more than the voltage value of DC power supply I, is started shooting and started by DC power supply I, and cut
DC power supply II is shifted to, entire starting, handoff procedure can be described as follows：
After control algolithm circuit detects that DC power supply I state is normal, the close command of contactor I is provided, makes its closure,
Enabled d type flip flop N2, IGBT Q1 is open-minded simultaneously, and inverter bus capacitor starts to charge up, and generates dash current, when detecting
When electric current is more than current limliting reference value, IGBT Q1 shut-offs, input current is dropped to below current limliting reference value, the first inductance L1 sensings
The due to voltage spikes of generation is inhibited by peak voltage absorbing circuit 102, is arrived in the next high level of d type flip flop N2 clock ends CK
When, IGBT is open-minded again.After several cycles, inverter bus capacitor charging complete, input current value of feedback is consistently less than limit
Reference value is flowed, Qn is always high level signal, and IGBT Q1 remain conducting state.
Control algolithm circuit detect DC power supply I state exception and DC power supply II states it is normal after, first block D triggering
Device N2 turns off IGBT Q1, provides the open command of contactor I afterwards, contactor I is made to realize that zero current disengages, control algolithm
After circuit receives contactor I contacts disconnection feedback signal, then provide the close command of contactor II.When contactor II is closed
Afterwards, control algolithm circuit enables that d type flip flop N2, IGBT Q1 are open-minded, since the voltage value of DC power supply II is more than DC power supply I
Voltage value, inverter bus capacitor starts to charge up, and generates dash current, when detecting that electric current is more than current limliting reference value,
IGBT Q1 are turned off, and input current is dropped to below current limliting reference value, and the due to voltage spikes that the second inductance L2 sensings generate is by spike electricity
Pressure absorbing circuit 102 inhibits, and when the next high level of d type flip flop N2 clock ends CK arrives, IGBT is open-minded again.Several cycles
Afterwards, inverter bus capacitor charging complete, input current value of feedback are consistently less than current limliting reference value, and Qn is always high level letter
Number, IGBT Q1 remain conducting state.
The current-limited waveform in starting and handoff procedure is shown respectively in Fig. 4 and Fig. 5, and dash current can be effectively suppressed.
Claims (3)
1. a kind of direct-current dual power starts and switching current-limiting circuit, two-way direct-current input power supplying I and II is to inverter power supply, direct current
Power supply I outputs are connected to contactor I, and DC power supply II outputs are connected to contactor II, which is characterized in that
The output-parallel of contactor I and contactor II to same point are followed by starting and switching current limiting unit, start and switching limits
The output of stream unit is connected to inverter dc-link capacitance；
The contact feedback signal for gathering the output voltage signal of DC power supply I and DC power supply II, contactor I and contactor II is sent
To control algolithm circuit, control algolithm circuit generates contactor control signal and send to current limliting realization circuit and contactor control electricity
Road, starts and switching current limiting unit includes IGBT Q1 and voltage peak absorbing circuit in parallel, inverter input current signal
As value of feedback current limliting is sent to realize circuit, current limliting realizes that circuit generates IGBT Q1 control signals to starting and switching current limiting unit.
2. direct-current dual power starts and switches current-limiting circuit according to claim 1, which is characterized in that the due to voltage spikes is inhaled
Circuit is received to be made of the first capacitance C1, the second capacitance C2, first resistor R1, the first diode D1；First capacitance C1 is parallel to
IGBT Q1 collector and emitters both ends；Mono- ends of first resistor R1 are connected to IGBT Q1 collectors, the other end and the second capacitance C2
One end be connected, another emitter for being terminated at IGBT Q1 of the second capacitance C2；First diode D1 is parallel to first resistor R1
Both ends, and the anode of D1 is connected with the collector of IGBT Q1.
3. direct-current dual power according to claim 1 or claim 2 starts and switching current-limiting circuit, which is characterized in that the current limliting is real
Existing circuit includes comparator N1, d type flip flop N2, second resistance R2,3rd resistor R3, the second diode D2, the 3rd diode D3
And IGBT drive circuit；
Input current value of feedback is sent into comparator N1 forward ends, and current limliting reference value is sent into comparator negative end, comparator N1 outputs
End is pulled to power Vcc by 3rd resistor R3；3rd diode D3 anodes are connected with comparator N1 output terminals, D3 cathodes and D
Trigger N2 set ends S-phase connects；The d type flip flop that second diode D2 anodes connect the generation of control algolithm circuit enables and blocks letter
Number, D2 cathodes are connected with the 3rd diode D3 cathodes；Second resistance R2 mono- terminates d type flip flop N2 set end S, other end ground connection；D
Trigger N2 clock ends CK connects the square-wave signal of a fixed frequency, reset terminal R ground connection, data input pin D ground connection, reversed-phase output
Qn is sent to IGBT drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721148531.0U CN207382186U (en) | 2017-09-08 | 2017-09-08 | Direct-current dual power starts and switching current-limiting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721148531.0U CN207382186U (en) | 2017-09-08 | 2017-09-08 | Direct-current dual power starts and switching current-limiting circuit |
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| Publication Number | Publication Date |
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| CN207382186U true CN207382186U (en) | 2018-05-18 |
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| CN201721148531.0U Active CN207382186U (en) | 2017-09-08 | 2017-09-08 | Direct-current dual power starts and switching current-limiting circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200356A (en) * | 2018-11-16 | 2020-05-26 | 力晶积成电子制造股份有限公司 | Power switch control circuit and control method thereof |
-
2017
- 2017-09-08 CN CN201721148531.0U patent/CN207382186U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200356A (en) * | 2018-11-16 | 2020-05-26 | 力晶积成电子制造股份有限公司 | Power switch control circuit and control method thereof |
| CN111200356B (en) * | 2018-11-16 | 2021-06-22 | 力晶积成电子制造股份有限公司 | Power switch control circuit and control method thereof |
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