CN206517293U - Power inverter - Google Patents
Power inverter Download PDFInfo
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- CN206517293U CN206517293U CN201621463434.6U CN201621463434U CN206517293U CN 206517293 U CN206517293 U CN 206517293U CN 201621463434 U CN201621463434 U CN 201621463434U CN 206517293 U CN206517293 U CN 206517293U
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- 230000004224 protection Effects 0.000 claims abstract description 52
- 230000005611 electricity Effects 0.000 claims description 19
- 238000002955 isolation Methods 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
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Abstract
The utility model be related to can make when occurring overvoltage power output end stop output and after attempting to release overvoltage condition automatic electric power output of recovering without the power inverter that is resetted to whole system.The input electric power for being supplied to power input end is converted into output power and from power output end output, including：Be connected between the power input end and the power output end, the input electric power changed, its work whether by indication signal control converter；And be connected with the power output end and the converter, using the output power as power supply, for sending the indication signal to the converter, indicating that when overvoltage occurs for the voltage for detecting the power output end converter is stopped, does not send the indication signal when overvoltage occurs for the voltage for being not detected by the power output end or when the output power is stopped power supply, so that the in running order overvoltage protection of the converter.
Description
Technical field
The utility model is related to power inverter, the more particularly to power inverter with over-voltage protection function.
Background technology
In the past, for example in the power inverter that AC-input voltage is converted to desired VD,
In order to prevent the crest voltage produced by the fluctuation of AC-input voltage from being had undesirable effect to electrical equipment of output end etc.,
It would generally prevent output voltage from occurring overvoltage using the voltage regulation unit with over-voltage protection function.Have as existing
The power inverter of over-voltage protection function for example has the technology described in patent document 1,2.
Fig. 4 is the circuit diagram for the structure for representing the power inverter described in patent document 1.As shown in figure 4, control electricity
Road CNT41 is made up of lock-in circuit LT41, phototriode P41, electronic component R41, R42.When output voltage Vout occurred
During voltage, LED P 11 lights, and is led with the phototriode P41 of the disconnecting unit 40 of the optical coupling of LED P 11
It is logical.As a result, high level signal is through the after-applied input unit in lock-in circuit LT41 of electronic component R41, R42 partial pressure.Locking
Circuit LT41 is kept to the high level signal, and provides high level signal to p-type MOS transistor Q41 grid, thus will
P-type MOS transistor Q41 controls into nonconducting state.Therefore, DC input voitage Vin offer is disconnected, Vout overvoltage
It is suppressed.
Fig. 5 is the circuit diagram for the structure for representing the power inverter described in patent document 2.As shown in figure 5, electric power turns
Feedback circuit and excess voltage protection are provided between the secondary side output line and ground wire of changing device.Feedback circuit includes resistance
R53, R54, R55, shunt regulator TL, photoelectrical coupler PC1 and controlling transistor Q52.When the output of secondary side output line
Voltage V0During more than threshold value 1, the output voltage after resistance R53, R54 partial pressure is applied in shunt regulator TL, makes in parallel steady
Depressor TL is turned on, and shunt regulator TL cathode voltage declines, the luminous quantity increase of photo-coupler PC1 light emitting diode, from
And flow through the electric current increase of phototriode.Corresponding with the curent change, controlling transistor Q52 conductings are brilliant to flowing into switch
Body pipe Q51 base current is shunted, and switching transistor Q51 ON time shortens.Thus, inflow transformer T electricity
Power reduces, output voltage V0It is minimized.In addition, excess voltage protection includes voltage-stabiliser tube D52, resistance R56, R57, photoelectricity coupling
Clutch PC2 and controlling transistor Q53.As the output voltage V of secondary side output line0Further exceed the threshold value 2 higher than threshold value 1
When (that is, the voltage stabilizing threshold value more than voltage-stabiliser tube D52), voltage-stabiliser tube D52 conductings are sent out so as to photoelectrical coupler PC2 light emitting diode
Light.Thus, controlling transistor Q53 is turned on, and the base current for flowing into switching transistor Q51 is entered via controlling transistor Q53
One step is shunted, so that switching transistor Q51 ends, one time lateral circuit is disconnected.Therefore, output voltage V0Overvoltage pressed down
System.
Prior art literature
Patent document 1：Japanese Patent Laid-Open 2013-74737 publications
Patent document 2：Japanese Patent Laid-Open 4-251556 publications
Utility model content
Utility model technical problem to be solved
In the scheme described in patent document 1, it can prevent from producing because of the fluctuation of AC-input voltage to a certain extent
Raw crest voltage has undesirable effect to electrical equipment of output end etc..However, it is quilt once to occur overvoltage lock-in circuit
It is locked, so as to can not continue to output power, it is necessary to can just be continuing with after system is resetted, therefore, to cause the electric power
Conversion equipment is very inconvenient with getting up.
In addition, in patent document 1, the crest voltage produced in the fluctuation because of input voltage does not deviate normal electricity significantly
Pressure and the duration it is shorter in the case of, too much influence can't be caused to the electrical equipment of output end, it is therefore not necessary to specially
Input voltage is disconnected for this.Otherwise, the problem of power-off number of times is too frequent can be caused.
In addition, in the scheme described in patent document 2, although solve and slightly deviate just by setting two threshold values
The problem of crest voltage of normal voltage causes frequent power-off, but it is identical with patent document 1, however it remains once output voltage V0It is super
Cross the problem of threshold value 2 is just locked as disconnecting the state of a lateral circuit and can not automatically recovering.Therefore, it is still necessary to carry out system
It can be just continuing with after reset, it is still very inconvenient with getting up.
In addition, in patent document 2, as output voltage V0Shunted during more than threshold value 1, so that transimission power can be caused
Loss so that circuit whole efficiency reduction.
The utility model completes to solve the above problems, and its object is to there is provided one kind there is overvoltage to protect
The power inverter of protective function, the power inverter can make power output end stop output, and energy when occurring overvoltage
Automatic electric power output of recovering to whole system without resetting after attempting to release overvoltage condition.
Solve the technical scheme that technical problem is used
(1) input electric power for being supplied to power input end is converted into output power by power inverter of the present utility model
And exported from power output end, it is characterised in that including：Converter, the converter be connected to the power input end and
Between the power output end, the input electric power is changed, whether its work is controlled by indication signal；And mistake
Voltage protection, the overvoltage protection is connected with the power output end and the converter, with the output electricity
Masterpiece is power supply, for sending the indication signal to the converter, is occurred in the voltage for detecting the power output end
During overvoltage, indicate that the converter is stopped, when overvoltage occurs for the voltage for being not detected by the power output end, or
Person does not send the indication signal when the output power is stopped power supply, so that the converter is in running order.
(2) it is preferably that the overvoltage protection includes：Overvoltage decision circuit, the overvoltage decision circuit with it is described
Power output end is connected, and the voltage of the output power is detected, occurs overvoltage in the voltage of the output power
When, export the trigger signal of high level；And lock-in circuit, the lock-in circuit is connected with the overvoltage decision circuit, and
It is connected with the power output end, when receiving the trigger signal of the high level, converter described in output indication stops
The signal of work, and the state that this is stopped is locked, when the output power is stopped power supply, unlock and make
The converter is in running order.
(3) it is preferably that the overvoltage decision circuit includes：Comparison circuit, the input of the comparison circuit is via partial pressure electricity
Road is connected with the power output end, the voltage of the output power after partial pressure is detected, described in after partial pressure
When the voltage of output power exceedes defined threshold voltage, low level voltage is exported；And logic level converting circuit, the logic
The input of level shifting circuit is connected with the output end of the comparison circuit, the low level that the comparison circuit is exported
Trigger signal and output of the voltage conversion into the high level.
(4) it is preferably that the comparison circuit includes shunt regulator, the test side of the shunt regulator is via the partial pressure
Circuit is connected with the power output end, and negative electrode is connected via the 1st resistance with the power output end, and is connected to described
The output end of comparison circuit, plus earth.
(5) it is preferably that the logic level converting circuit includes：N-channel FET, the grid of the N-channel FET
It is connected with the output end of the comparison circuit, and via the 2nd resistance eutral grounding, drains via the 3rd resistance and the electric power output
End is connected, source ground；And diode, the anode of the diode is connected with the drain electrode of the N-channel FET, cloudy
Pole is connected with the output end of the overvoltage decision circuit.
(6) it is preferably that the lock-in circuit includes：PNP transistor, the colelctor electrode of the PNP transistor is via the 4th electricity
Resistance ground connection, and is connected with the output end of the overvoltage decision circuit, emitter stage successively via the 5th resistance and the 6th resistance with
The power output end is connected；NPN transistor, the base stage of the NPN transistor and the colelctor electrode of the PNP transistor
It is connected, colelctor electrode is connected with the base stage of the PNP transistor, grounded emitter；And light emitting diode, this luminous two
Pole pipe is connected with the 5th resistor coupled in parallel, and its anode is connected with the connecting line of the 5th resistance and the 6th resistance, negative electrode
It is connected with the emitter stage of the PNP transistor, the light that the overvoltage protection is sent the light emitting diode
It is converted into the indication signal and sends to the converter.
(7) it is preferably that the lock-in circuit is realized using control chip.
(8) it is preferably that the overvoltage protection also includes：Delay circuit, the delay circuit and the lock-in circuit phase
Connection, exports described after the signal that converter described in the lock-in circuit output indication is stopped, after delay stipulated time
Indication signal indicates that the converter is stopped.
(9) it is preferably that the overvoltage protection also includes：Isolation circuit, the isolation circuit is connected to the locking electricity
Between road and the delay circuit, electrical isolation is carried out to the lock-in circuit and the delay circuit.
Utility model effect
Power inverter according to involved by the utility model, can stop power output end defeated when occurring overvoltage
Go out, and electric power output can be recovered automatically without being resetted to whole system after attempting to release overvoltage condition.
Brief description of the drawings
Fig. 1 is the block diagram for the structure for representing the power inverter involved by embodiment 1.
Fig. 2 is the block diagram for the concrete structure for representing the overvoltage protection shown in Fig. 1.
Fig. 3 is the circuit diagram of the structure for the overvoltage protection for representing embodiment of the present utility model.
Fig. 4 is the circuit diagram for the structure for representing the power inverter described in patent document 1.
Fig. 5 is the circuit diagram for the structure for representing the power inverter described in patent document 2.
Embodiment
Below, referring to the drawings, to being illustrated for implementing preferred embodiment of the present utility model.In each figure, to identical
Component marks identical label, and omits repeat specification.
Embodiment 1.
[structure]
Fig. 1 is the block diagram for the structure for representing the power inverter 1 involved by present embodiment 1.Power inverter 1 will
It is supplied to the input electric power of power input end to be converted into output power, and is exported from power output end.Wherein, input electric power
Can be direct current power or alternating electromotive force.
As shown in figure 1, power inverter 1 includes overvoltage protection 100 and converter 200.
Converter 200 is connected between power input end and power output end, and input electric power is changed, by input electricity
Power is converted into output power.As converter 200, such as can enumerate rectifier, transformer, DC-DC converter.Converter
Whether 200 work is controlled by indication signal.Specifically, for example can converter internal series-connection MOS transistor, three
The switch elements such as pole pipe, indication signal are inputted the control end of the switch element, and the switching to the switch element is controlled,
Thus the working condition of converter is controlled.In addition, when converter is bridge rectifier etc., indication signal can also be utilized
Carry out the break-make directly to the switch element on each bridge arm to be controlled, the working condition of converter is controlled with this.
Overvoltage protection 100 is connected with power output end, and the voltage of power output end is detected, and with this
The output power of power output end is used as power supply.In addition, the output end of overvoltage protection 100 is connected with converter 200,
For sending indication signal to converter 200.When overvoltage occurs for the voltage for detecting power output end, overvoltage protection dress
Put 100 and send indication signal to converter 200, indicate that converter 200 is stopped.When converter 200 is stopped and cause
During output power vanishing, the power supply to overvoltage protection 100 stops immediately.Now, overvoltage protection 100 stops
Indication signal is sent, so that converter 200 is resumed work.In addition, in the normal work of power inverter 1 and overvoltage protection
When device 100 is not detected by overvoltage, also indication signal is not sent to converter 200, so that converter 200 maintains work shape
State.
[effect and effect]
According to above-mentioned power inverter 1, can occur fluctuation in the voltage of power input end and cause power output end
When overvoltage occurs for voltage, power output end is set to stop output by making converter 200 be stopped, so as to prevent electricity
Pressure pair electrical equipment being connected with power output end etc. has undesirable effect.
Further, since overvoltage protection 100 is using the output power of power output end as power supply, therefore, in electric power
Output end stops after output, and the power supply to overvoltage protection 100 also stops immediately.Then, overvoltage protection 100 stops
Indication signal only is sent to converter 200, converter 200 restarts input electric power being converted into output power and defeated from electric power
Go out to hold and exported, the power supply also automatic recovery simultaneously to overvoltage protection 100.Now, if power output end it is excessively electric
Pressure condition is released from, then overvoltage protection 100 will not send indication signal, the normal work of power inverter 1, also,
Overvoltage protection 100 continues to monitor the voltage of power output end, into next circulation.Therefore, this practicality is new
The power inverter of type can recover electric power output automatically after attempting to release overvoltage condition, without being carried out to whole system
Reset, use more convenient.
Below, reference picture 2, are illustrated to the concrete structure of the overvoltage protection 100 in present embodiment 1.
[structure]
Fig. 2 is the block diagram for the concrete structure for representing the overvoltage protection 100 shown in Fig. 1.
As shown in Fig. 2 overvoltage protection 100 includes overvoltage decision circuit 2 and lock-in circuit 3.
Overvoltage decision circuit 2 is connected with power output end, and the voltage of output power is detected, and in output electricity
When the voltage of power sends overvoltage, the trigger signal of the high level of situation for notifying from the overvoltage to rear class is exported.
Overvoltage decision circuit 2 is made up of comparison circuit 21 and logic level converting circuit 22.Comparison circuit 21 for example may be used
It is connected via bleeder circuit with power output end, its output end is connected with the input of logic level converting circuit 22.
Comparison circuit 21 is compared the voltage of the output power after the partial pressure reference voltage internal with it, i.e. defined threshold voltage
Compared with when the voltage of the output power after partial pressure exceedes threshold voltage, to the output low level voltage of logic level converting circuit 22.
The low level voltage is converted into high level by logic level converting circuit after the low level voltage from comparison circuit is received
Trigger signal, the situation of overvoltage is notified to rear lock-in circuit 3 described later.
In addition, in the present embodiment, overvoltage decision circuit 2 is not limited thereto using output power as power supply.
For example, it is also possible to be used as the power supply of overvoltage decision circuit 2 by the use of other power supplys independently of output power.
Lock-in circuit 3 is connected with overvoltage decision circuit 2, and is connected with power output end, with power output end
Output power is used as power supply.When receiving the trigger signal of the high level from overvoltage decision circuit 2, lock-in circuit 3 to
The signal that rear class output indication converter is stopped, and the state that this is stopped is locked.Stop in output power
After power supply, lock-in circuit 3 unlocks, so as to stop the signal being stopped to rear class output indication converter.
In addition, overvoltage protection 100 also includes isolation circuit 4 and the delay circuit surrounded by the dotted line in Fig. 2
5.Delay circuit 5 is connected via isolation circuit 4 with lock-in circuit 3, is stopped in the output indication converter of lock-in circuit 3
Signal after, output indication signal indicates that converter is stopped after delay stipulated time.Isolation circuit 4 is connected to locking electricity
Between road 3 and delay circuit 5, electrical isolation is carried out to lock-in circuit 3 and the delay circuit 5 of rear class.
In addition, in the present embodiment, lock-in circuit 3 is via both isolation circuit 4 and delay circuit 5 and converter
It is connected, but is not limited thereto.Lock-in circuit 3 directly can also be connected with converter 200 and to its output indication signal,
Or be connected via any one in isolation circuit 4 and delay circuit 5 with converter 200.
[effect and effect]
According to said structure, because comparison circuit is that the voltage of the output power after bleeder circuit partial pressure is examined
Survey, therefore, by adjusting the intrinsic standoff ratio of bleeder circuit, the peak value electricity for the output power that triggering overvoltage protection can be acted
Pressure is adjusted.Therefore, when the voltage of output power is the small size crest voltage of a lasting short period, it will not trigger
Voltage protection is acted, so as to be avoided that power-off number of times is excessively frequent.
Further, since lock-in circuit 3 is locked immediately after the trigger signal of high level is received, therefore, even if triggering
Signal is a short pulse signal, also can continue to lock-out state after pulse signal reverts to low level.Therefore, overvoltage
The action sensitivity of protection device is higher.
Further, since being that the voltage of the output power after partial pressure locks lock-in circuit 3 when exceeding defined threshold voltage
It is set to the state for making converter be stopped, and makes lock-in circuit because power supply stops and solves automatically after converter is stopped
Except locking, therefore it may only be necessary to set 1 threshold value to overvoltage protection, you can make converter in working condition with stopping work
Make to switch over automatically between state, thus, design can be simplified, reduce unit scale, cost is reduced.
Below, reference picture 3, are illustrated to specific embodiment of the utility model.
Embodiment
Fig. 3 is the circuit diagram of the structure for the overvoltage protection 100 for representing the present embodiment.
As shown in figure 3, overvoltage protection 100 includes comparison circuit 21, logic level converting circuit 22, lock-in circuit
3rd, isolation circuit 4 and delay circuit 5.
Wherein, comparison circuit 21 includes shunt regulator U1.Shunt regulator U1 test side is via by resistance R1 and electricity
The bleeder circuit that resistance R2 is constituted, is connected with power output end.Shunt regulator U1 negative electrode via the 1st resistance R3 with electricity
Power output end is connected, plus earth.
Logic level converting circuit 22 includes N-channel FET Q1 and diode D1.N-channel FET Q1 grid
It is connected with shunt regulator U1 negative electrode, and is grounded via the 2nd resistance R4, is drained via the 3rd resistance R5 and electric power output
End is connected, source ground.Diode D1 anode is connected with N-channel FET Q1 drain electrode.
Lock-in circuit 3 includes PNP transistor Q2 and NPN transistor Q3.PNP transistor Q2 colelctor electrode is via
4 resistance R6 are grounded, and are connected with diode D1 negative electrode, and emitter stage is successively via the 5th resistance R7 and the 6th resistance R8, with electricity
Power output end is connected.NPN transistor Q3 base stage is connected with PNP transistor Q2 colelctor electrode, colelctor electrode and positive-negative-positive
Transistor Q2 base stage is connected, grounded emitter.In addition, at the 5th resistance R7 two ends, being also connected in parallel to photoelectricity described later
Light emitting diode D4 in coupler U2, the connecting line phase of the light emitting diode D4 anode and the 5th resistance R7 and the 6th resistance R8
Connection, negative electrode is connected with PNP transistor Q2 emitter stage.
Isolation circuit 4 is made up of photoelectrical coupler U2, including light emitting diode D4 and phototriode P4.
In delay circuit 5, phototriode P4 colelctor electrode via resistance R11 with different from the another of power output end
Power supply is connected, and emitter stage is grounded via resistance R10 and resistance R9 successively.The string being made up of diode D3 and resistance R13
Join circuit, with being connected in parallel by diode D2 and resistance the R12 series circuit constituted.Diode D3 negative electrode and diode D2
Anode be connected, anode is connected with resistance R13 one end.Diode D2 negative electrode is connected with resistance R12 one end.Two
The connecting line of pole pipe D3 negative electrode and diode D2 anode all with resistance R9 and resistance R10 is connected.The resistance R12 other end
It is connected with the resistance R13 other end, and is grounded via capacitor C12.
In addition, as the output of delay circuit 5, the resistance R12 other end and the resistance R13 other end also with N-channel
FET Q4 grid is connected.N-channel FET Q4 source ground, drain electrode is connected with converter (not shown)
Connect, for converter output indication signal.
Below, the overvoltage protection of the overvoltage protection 100 when power output end occurring overvoltage, which is acted, to be carried out
Explanation.
First, when power output end occur overvoltage when, the high level voltage after bleeder circuit R1, R2 partial pressure input to
Shunt regulator U1 test side.Shunt regulator U1 is by the high level voltage inputted and its internal such as 1.25~2.5V
Reference voltage (that is, defined threshold voltage) be compared.It is in parallel when the high level voltage inputted is higher than reference voltage
Voltage-stablizer U1 negative electrode is turned on and is grounded with anode, as low level.
Then, N-channel FET Q1 grid turns into low level, and N-channel FET Q1 cut-offs, its drain electrode turns into height
Level.Thus, diode D1 is turned on, and high level signal is exported to NPN transistor Q3 base via diode D1 negative electrode
Pole.
After base stage receives high level signal, NPN transistor Q3 conductings, colelctor electrode turns into low level.Thus, base stage
The PNP transistor Q2 conductings being connected with the colelctor electrode of NPN transistor, PNP transistor Q2 colelctor electrode is brilliant to NPN type
Body pipe Q3 base stage provides high level, so as to complete locking.In this case, even if from diode D1 high level signal
Removed, lock-in circuit 3 can also maintain lock-out state, so as to make indication signal described later persistently export.
Then, it is therefore, luminous in photoelectrical coupler U2 because PNP transistor Q2 emitter stage is turned on colelctor electrode
Diode D4 negative electrode is connected via PNP transistor Q2 emitter stage, colelctor electrode and the 4th resistance R6 with ground connection, and sends out
Optical diode D4 anode is then connected via the 6th resistance R8 with power output end.Then, it is applied with light emitting diode D4
Lighted by the forward voltage that output power is provided, so that the phototriode P4 conductings in photoelectrical coupler U2.Due to
Phototriode P4 colelctor electrode is to be connected via resistance R11 with secondary side power supply described later, and light emitting diode D4 is then
It is as power supply, it is thereby achieved that electrical isolation, can eliminate shadow of the fluctuation to late-class circuit of power output end by output power
Ring, become more stable the control to converter.
Then, the voltage of secondary side power supply is put on via phototriode P4, the resistance R10 after resistance R11, conducting
Resistance R9, so that diode D2 is turned on.Then, electric current flows through diode D2 and capacitor C12 is charged, and makes FET
Q4 grid voltage slowly rises to conducting voltage.Thus, turn on FET Q4, so as to be exported to converter (not shown)
Low level indication signal, indicates that converter is stopped.So far, the overvoltage protection of overvoltage protection 100 has been acted
Into.
Below, the autonomous recovery action of overvoltage protection 100 is illustrated.
First, after converter is stopped, the voltage of power output end slowly drops to 0.Now, NPN transistor
Q3 base stage turns into low level and ended, and PNP transistor Q2 also ends therewith, the automatic unlocking of lock-in circuit 3.
Then, light emitting diode D4 stops luminous, phototriode P4 cut-offs.
Then, the connection between secondary side power supply and resistance R9 is disconnected, and capacitor C12 starts via resistance R13, two poles
Pipe D3 and resistance R9 and discharged to ground, until FET Q4 grid voltage is down to below conducting voltage, FET
Q4 ends.Thus, overvoltage protection 100 stops sending indication signal, the shape so that converter is resumed work to converter
State.
In the above-described embodiments, it is preferably that resistance R12 resistance value is set smaller, and resistance R13 resistance value is set
Obtain larger.Thus, can indicate rapid sent to converter when overvoltage occurs for power output end of overvoltage protection 100
Signal, and the slow work for recovering converter that sends for stopping indication signal after converter is stopped, so as to prevent
Overvoltage protection frequent movement in the state of input voltage does not recover from fluctuation yet.
In addition, in the above-described embodiments, to constituting locking using circuit elements such as PNP transistor, NPN transistors
The structure of circuit is illustrated, but is not limited thereto.For example, it is also possible to realize lock-in circuit using control chip.
Embodiment of the present utility model and embodiment are illustrated above.It will be understood that the implementation of this disclosure
All aspects of mode and embodiment are only that citing is represented, are not restricted.Scope of the present utility model will by right
Seek book to represent, and not represented by above-mentioned embodiment and embodiment, scope of the present utility model also includes and right
All amendments and deformation in the equivalent implication of claim and scope.
Label declaration
1 power inverter
2 overvoltage decision circuits
3 lock-in circuits
4 isolation circuits
5 delay circuits
21 comparison circuits
22 logic level converting circuits
100 overvoltage protections
200 converters
U1 shunt regulators
The resistance of R3 the 1st
Q1 N-channel FETs
The resistance of R4 the 2nd
The resistance of R5 the 3rd
D1 diodes
Q2 PNP transistors
The resistance of R6 the 4th
The resistance of R7 the 5th
The resistance of R8 the 6th
Q3 NPN transistors
U2 photoelectrical couplers
D4 light emitting diodes
P4 phototriodes
40 disconnecting units
CNT41 controls circuit
P11 light emitting diodes
P41 phototriodes
LT41 lock-in circuits
Q41p type MOS transistors
T transformers
Q51 switching transistors
Q52, Q53 controlling transistor
PC1, PC2 photoelectrical coupler
TL shunt regulators
Claims (9)
1. the input electric power for being supplied to power input end is converted into output electricity by a kind of power inverter, the power inverter
Power is simultaneously exported from power output end, it is characterised in that including：
Converter, the converter is connected between the power input end and the power output end, and the input electric power is entered
Whether row conversion, its work is controlled by indication signal；And
Overvoltage protection, the overvoltage protection is connected with the power output end and the converter, with described
Output power, for sending the indication signal to the converter, is detecting the electricity of the power output end as power supply
When overvoltage is given birth in pressure, indicate that the converter is stopped, occurred electricity in the voltage for being not detected by the power output end
During pressure, or when the output power is stopped power supply, the indication signal is not sent, so that the converter is in work
State.
2. power inverter as claimed in claim 1, it is characterised in that
The overvoltage protection includes：
Overvoltage decision circuit, the overvoltage decision circuit is connected with the power output end, to the electricity of the output power
Pressure is detected, when overvoltage occurs for the voltage of the output power, exports the trigger signal of high level；And
Lock-in circuit, the lock-in circuit is connected with the overvoltage decision circuit, and is connected with the power output end,
When receiving the trigger signal of the high level, the signal that converter described in output indication is stopped, and this is stopped
State locked, when the output power is stopped power supply, unlock and make the converter in running order.
3. power inverter as claimed in claim 2, it is characterised in that
The overvoltage decision circuit includes：
Comparison circuit, the input of the comparison circuit is connected via bleeder circuit with the power output end, after partial pressure
The voltage of the output power is detected, when the voltage of the output power after partial pressure exceedes defined threshold voltage,
Export low level voltage；And
Logic level converting circuit, the input of the logic level converting circuit is connected with the output end of the comparison circuit,
The low level voltage that the comparison circuit is exported is converted into the trigger signal of the high level and output.
4. power inverter as claimed in claim 3, it is characterised in that
The comparison circuit includes shunt regulator, and the test side of the shunt regulator is via the bleeder circuit and the electric power
Output end is connected, and negative electrode is connected via the 1st resistance with the power output end, and is connected to the output of the comparison circuit
End, plus earth.
5. power inverter as claimed in claim 3, it is characterised in that
The logic level converting circuit includes：
N-channel FET, the grid of the N-channel FET is connected with the output end of the comparison circuit, and via the 2nd
Resistance eutral grounding, drain electrode is connected via the 3rd resistance with the power output end, source ground；And
Diode, the anode of the diode is connected with the drain electrode of the N-channel FET, and negative electrode judges with the overvoltage
The output end of circuit is connected.
6. power inverter as claimed in claim 2, it is characterised in that
The lock-in circuit includes：
PNP transistor, the colelctor electrode of the PNP transistor via the 4th resistance eutral grounding, and with the overvoltage decision circuit
Output end is connected, and emitter stage is connected via the 5th resistance and the 6th resistance with the power output end successively；
NPN transistor, the base stage of the NPN transistor is connected with the colelctor electrode of the PNP transistor, colelctor electrode and institute
The base stage for stating PNP transistor is connected, grounded emitter；And
Light emitting diode, the light emitting diode is connected with the 5th resistor coupled in parallel, its anode and the 5th resistance and the described 6th
The connecting line of resistance is connected, and negative electrode is connected with the emitter stage of the PNP transistor,
The light that the light emitting diode is sent is converted into the indication signal and sent to institute by the overvoltage protection
State converter.
7. power inverter as claimed in claim 6, it is characterised in that
The lock-in circuit is realized using control chip.
8. the power inverter as described in any one of claim 2 to 7, it is characterised in that
The overvoltage protection also includes：
Delay circuit, the delay circuit is connected with the lock-in circuit, in converter described in the lock-in circuit output indication
The indication signal is exported after the signal being stopped, after delay stipulated time to indicate that the converter is stopped.
9. power inverter as claimed in claim 8, it is characterised in that
The overvoltage protection also includes：
Isolation circuit, the isolation circuit is connected between the lock-in circuit and the delay circuit, to the lock-in circuit with
The delay circuit carries out electrical isolation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463434.6U CN206517293U (en) | 2016-12-29 | 2016-12-29 | Power inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463434.6U CN206517293U (en) | 2016-12-29 | 2016-12-29 | Power inverter |
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| CN206517293U true CN206517293U (en) | 2017-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917102A (en) * | 2019-05-08 | 2020-11-10 | 横河电机株式会社 | Overvoltage protection circuit and power supply device |
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2016
- 2016-12-29 CN CN201621463434.6U patent/CN206517293U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111917102A (en) * | 2019-05-08 | 2020-11-10 | 横河电机株式会社 | Overvoltage protection circuit and power supply device |
| US11381155B2 (en) | 2019-05-08 | 2022-07-05 | Yokogawa Electric Corporation | Overvoltage protection circuit and power supply apparatus |
| CN111917102B (en) * | 2019-05-08 | 2023-02-17 | 横河电机株式会社 | Overvoltage protection circuit and power supply device |
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