CN206559224U - Power inverter - Google Patents
Power inverter Download PDFInfo
- Publication number
- CN206559224U CN206559224U CN201621463958.5U CN201621463958U CN206559224U CN 206559224 U CN206559224 U CN 206559224U CN 201621463958 U CN201621463958 U CN 201621463958U CN 206559224 U CN206559224 U CN 206559224U
- Authority
- CN
- China
- Prior art keywords
- circuit
- output end
- power
- resistance
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000004224 protection Effects 0.000 claims abstract description 52
- 238000002955 isolation Methods 0.000 claims description 40
- 239000013641 positive control Substances 0.000 claims description 31
- 230000005611 electricity Effects 0.000 claims description 14
- 230000000052 comparative effect Effects 0.000 claims description 12
- 239000013642 negative control Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000005622 photoelectricity Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009993 protective function Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
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, for sending the indication signal, so as to indicate the overvoltage protection that the converter is stopped, stopping sends indication signal state so that the converter is resumed work when the voltage for detecting the power output end is less than assigned voltage when overvoltage occurs for the voltage for detecting the power output end to 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 Fig. 4, control
Circuit CNT41 is made up of lock-in circuit LT41, phototriode P41, electronic component R41, R42.When output voltage Vout occurs
During overvoltage, 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 Fig. 5, electric power
Feedback circuit and excess voltage protection are provided between the secondary side output line and ground wire of conversion equipment.Feedback circuit includes electricity
Hinder R53, R54, R55, shunt regulator TL, photoelectrical coupler PC1 and controlling transistor Q52.It is defeated when secondary side output line
Go out voltage V0During more than threshold value 1, the output voltage after resistance R53, R54 partial pressure is applied in shunt regulator TL, makes parallel connection
Voltage-stablizer TL is turned on, and shunt regulator TL cathode voltage declines, the luminous quantity increase of photo-coupler PC1 light emitting diode,
So as to flow through the electric current increase of phototriode.Corresponding with the curent change, controlling transistor Q52 conductings are switched to flowing into
Transistor Q51 base current is shunted, and switching transistor Q51 ON time shortens.Thus, inflow transformer T
Electric power reduces, output voltage V0It is minimized.In addition, excess voltage protection includes voltage-stabiliser tube D52, resistance R56, R57, photoelectricity
Coupler PC2 and controlling transistor Q53.As the output voltage V of secondary side output line0Further exceed the threshold higher than threshold value 1
During value 2 (that is, the voltage stabilizing threshold value more than voltage-stabiliser tube D52), voltage-stabiliser tube D52 conductings are so as to photoelectrical coupler PC2 light-emitting diodes
Pipe is luminous.Thus, controlling transistor Q53 is turned on, and flows into switching transistor Q51 base current via controlling transistor Q53
Further shunted, so that switching transistor Q51 ends, one time lateral circuit is disconnected.Therefore, output voltage V0Overvoltage by
To suppression.
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, for becoming to described
Parallel operation sends the indication signal, so as to when overvoltage occurs for the voltage for detecting the power output end, indicate described become
Parallel operation is stopped, and when the voltage for detecting the power output end is less than assigned voltage, stops sending the indication signal,
The state so that converter is resumed work.
(2) it is preferably that the overvoltage protection includes：1st comparison circuit, the 1st comparison circuit is via the 1st partial pressure
Circuit is connected with the power output end, and the voltage of the power output end is compared with the 1st threshold voltage, in institute
When the voltage for stating power output end exceedes 1 threshold voltage, lock instruction is exported；And lock-in circuit, the lock-in circuit
It is connected with the converter, it is defeated to the converter when receiving the lock instruction from the 1st comparison circuit
Go out the indication signal and locked.
(3) be preferably that the 1st comparison circuit includes the 1st shunt regulator, the test side of the 1st shunt regulator via
1st bleeder circuit is connected with the power output end, and negative electrode is successively via the 1st resistance and the 2nd resistance and the electric power
Output end is connected, plus earth.
(4) it is preferably that the overvoltage protection also includes the 1st isolation circuit, the 1st isolation circuit is connected to described
Between 1st comparison circuit and the lock-in circuit, electrical isolation, institute are carried out to the 1st comparison circuit and the lock-in circuit
Stating the 1st isolation circuit includes：1st light emitting diode, the 1st light emitting diode is connected with the 1st resistor coupled in parallel, its anode with
1st resistance is connected with the connecting line of the 2nd resistance, and negative electrode is connected with the negative electrode of the 1st shunt regulator；With
And the 1st phototriode, the 1st phototriode is optically coupled with the 1st light emitting diode.
(5) it is preferably that the lock-in circuit includes：1st switch, the 1st switch positive control end successively via the 3rd resistance,
The emitter stage of 1st phototriode, the colelctor electrode of the 1st phototriode and the 4th resistance and with independently of described defeated
The external power source for going out electric power is connected, and is grounded via the 5th resistance, the negative control end ground connection of the 1st switch, the described 1st
1st output end of switch is connected via the 6th resistance and the 7th resistance with the external power source successively, the 1st switch
2nd output head grounding, wherein, in the positive control end input high level to the 1st switch, the 1st output end and the described 2nd
Output end is turned on；Diode, the anode of the diode is grounded via the 8th resistance, the positive control of negative electrode and the described 1st switch
End is connected；And PNP transistor, the base stage of the PNP transistor and the connection of the 6th resistance and the 7th resistance
Line is connected, and emitter stage is connected with the external power source, and colelctor electrode is connected via the 9th resistance with the anode of the diode
Connect.
(6) it is preferably that the overvoltage protection also includes：2nd comparison circuit, the 2nd comparison circuit is via the 2nd point
Volt circuit is connected with the power output end, and the voltage of the power output end is compared with the 2nd threshold voltage, and defeated
Go out comparative result；And release circuit, the release circuit is connected with the lock-in circuit, receives and compares electric from the described 2nd
The comparative result on road, when the comparative result is less than 2 threshold voltage for the voltage of the power output end, to
The lock-in circuit exports unlock instruction, to unlock, and the lock-in circuit is stopped the output indication signal.
(7) be preferably that the 2nd comparison circuit includes the 2nd shunt regulator, the test side of the 2nd shunt regulator via
2nd bleeder circuit is connected with the power output end, and negative electrode is successively via the 10th resistance and the 11st resistance and the electricity
Power output end is connected, plus earth.
(8) it is preferably that the overvoltage protection also includes the 2nd isolation circuit, the 2nd isolation circuit is connected to described
Between 2nd comparison circuit and the release circuit, electrical isolation, institute are carried out to the 2nd comparison circuit and the release circuit
Stating the 2nd isolation circuit includes：2nd light emitting diode, the 2nd light emitting diode is connected with the 10th resistor coupled in parallel, its anode
It is connected with the connecting line of the 10th resistance and the 11st resistance, negative electrode is connected with the negative electrode of the 2nd shunt regulator
Connect；And the 2nd phototriode, the 2nd phototriode is optically coupled with the 2nd light emitting diode, its colelctor electrode warp
It is connected by the 12nd resistance with the external power source independently of the output power, emitter stage is grounded via the 13rd resistance, when
When the voltage of the power output end is less than 2 threshold voltage, the overvoltage protection utilizes the 2nd photoelectricity three
The emitter voltage of pole pipe, low level control signal is exported to the release circuit.
(9) it is preferably that the release circuit includes：2nd switch, the positive control end of the 2nd switch receives the control letter
Number, it is described 2nd switch negative control end ground connection, it is described 2nd switch the 3rd output end via the 14th resistance with the external electrical
Source is connected, and is grounded via the 15th resistance, the 4th output head grounding of the 2nd switch, wherein, what is switched to the 2nd
During the input low level of positive control end, the 3rd output end disconnects with the 4th output end；And the 3rd switch, the 3rd switch
Positive control end is connected with the 3rd output end of the described 2nd switch, the negative control end ground connection of the 3rd switch, the 3rd switch
The 5th output end be connected with the anode of the diode, the 6th output head grounding of the 3rd switch, wherein, to the 3rd
During the positive control end input high level of switch, the 5th output end is turned on the 6th output end.
(10) it is preferably that the overvoltage protection also includes：Delay circuit, the delay circuit be connected to the described 2nd every
From between circuit and the release circuit, will be exported after the comparative result delay stipulated time from the 2nd comparison circuit to
The release 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.In addition,
The output end of overvoltage protection 100 is connected with converter 200, for sending indication signal to converter 200.In detection
To power output end voltage occur overvoltage when, overvoltage protection 100 to converter 200 send indication signal, indicate
Converter 200 is stopped.It is excessively electric when converter 200 is stopped and make it that the voltage of output power is less than assigned voltage
Pressure protection device 100 stops sending indication signal, the state so that converter 200 is resumed work to converter 200.In addition,
When the normal work of power inverter 1 and overvoltage protection 100 are not detected by overvoltage, also do not sent to converter 200
Indication signal, so that converter 200 maintains working condition.
[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 stops when the voltage for detecting power output end is less than assigned voltage
Indication signal is sent to converter 200, therefore, converter 200 restarts input electric power being converted into output power and from electricity
Power output end is exported.Now, if the overvoltage condition of power output end is released from, overvoltage protection 100 will not
Indication signal, the normal work of power inverter 1, also, overvoltage protection 100 is sent to continue to power output end
Voltage is monitored, into next circulation.Therefore, power inverter of the present utility model can attempted to release overvoltage shape
It is automatic after state to recover electric power output, without being resetted to whole system, 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 the 1st comparison circuit 12, the 1st isolation circuit 13 and lock-in circuit
14。
The input of 1st comparison circuit 12 is for example connected via the 1st bleeder circuit 11 with power output end.1st partial pressure
Circuit 11 carries out partial pressure with the 1st intrinsic standoff ratio to the voltage of power output end.1st comparison circuit 12 is by the output power after partial pressure
The voltage reference voltage internal with it is compared, when the voltage of the output power after partial pressure exceedes reference voltage, output lock
Fixed instruction.
If for example, setting the 1st intrinsic standoff ratio as 1/10, reference voltage is 2.5V, then now the threshold value of the 1st comparison circuit 12 is electric
Pressure, i.e. the 1st threshold voltage are 2.5/ (1/10)=25V.Now, if the voltage of output power is to turn into because occurring overvoltage
28V, then the 1st comparison circuit 12 be judged as the voltage of output power more than the 1st threshold voltage, so as to export lock instruction.
The input of lock-in circuit 14 is connected via the 1st isolation circuit 13 described later with the 1st comparison circuit 12, and its is defeated
Go out end with converter 200 (not shown) to be connected.Lock instruction from the 1st comparison circuit 12 is via the 1st isolation circuit 13
Input to lock-in circuit 14.Lock-in circuit 14 is after the lock instruction is received, to the output indication signal of converter 200 to indicate
Converter 200 is stopped, and the state that this is stopped is locked.
1st isolation circuit 13 is connected between the 1st comparison circuit 12 and lock-in circuit 14, the side such as by photoelectric coupling
Formula to carry out electrical isolation to the 1st comparison circuit 12 and lock-in circuit 14.
Herein, the situation that overvoltage protection 100 includes the 1st isolation circuit 13 is illustrated, but do not limited to
In this.Connect for example, it is also possible to which the 1st comparison circuit 12 is joined directly together with lock-in circuit 14 without using the 1st isolation circuit 13.
In addition, overvoltage protection 100 also includes the 2nd comparison circuit 16, the 2nd isolation circuit 17 and release circuit 19.
The input of 2nd comparison circuit 16 is for example connected via the 2nd bleeder circuit 15 with power output end.2nd partial pressure
Circuit 15 carries out partial pressure with the 2nd intrinsic standoff ratio to the voltage of power output end.2nd comparison circuit 16 is by the output power after partial pressure
The voltage reference voltage internal with it is compared, and exports comparative result.
If for example, setting the 2nd intrinsic standoff ratio as 1/4, reference voltage is 0.25V, then now the threshold value of the 2nd comparison circuit 16 is electric
Pressure, i.e. the 2nd threshold voltage are 0.25/ (1/4)=1V.Now, if the voltage of output power because converter 200 is stopped and under
Below 1V is down to, then the 2nd comparison circuit 16 is judged as that the voltage of output power is less than the 2nd threshold voltage, and exports this and compare knot
Really.
The input of release circuit 19 is connected via the 2nd isolation circuit 17 described later with the 2nd comparison circuit 16, and its is defeated
Go out end with lock-in circuit 14 to be connected.Release circuit 19 receives the comparative result from the 2nd comparison circuit 16.Compared according to this
As a result, when the voltage of output power is less than 2 threshold voltage, release circuit 19 exports unlock instruction to lock-in circuit 14, with
Lock-in circuit 14 is set to release the locking for the state for making converter 200 be stopped, so that lock-in circuit 14 stops to converter 200
Output indication signal.
2nd isolation circuit 17 is connected between the 2nd comparison circuit 16 and release circuit 19, the side such as by photoelectric coupling
Formula to carry out electrical isolation to the 2nd comparison circuit 16 and release circuit 19.
In addition, overvoltage protection 100 also includes delay circuit 18, the delay circuit 18 is connected to the 2nd isolation circuit
Between 17 and release circuit 19, it will be exported after the comparative result delay stipulated time from the 2nd comparison circuit 16 to release circuit
19。
In the present embodiment, lock-in circuit 14, delay circuit 18 and release circuit 19 are with independently of the outer of output power
Portion's power supply is not limited thereto as power supply.For example, it is also possible to which output power and is incited somebody to action as the power supply of lock-in circuit 14
External power source as release circuit 19 power supply.
In addition, in the present embodiment, the 2nd isolation circuit 17 is to be connected via delay circuit 18 with release circuit 19
Connect, but be not limited thereto.For example, the 2nd isolation circuit 17 directly can also be connected with release circuit 19, or, can also
It is not provided with the 2nd isolation circuit 17 and is directly connected to the 2nd comparison circuit with delay circuit 18 or lock-in circuit 19.
[effect and effect]
According to said structure, because the 1st comparison circuit is that the voltage of the output power after the 1st bleeder circuit partial pressure is entered
Row detection, therefore, by adjusting the 1st intrinsic standoff ratio, the crest voltage for the output power that triggering overvoltage protection can be acted
It is adjusted.Therefore, when the voltage of output power is the small size crest voltage of a lasting short period, electricity will not be triggered
Protection device action is pressed, so as to be avoided that power-off number of times is excessively frequent.
Further, since lock-in circuit 14 is locked immediately after lock instruction is received, therefore, even if lock instruction is one
Short pulse signal, also can continue to lock-out state after pulse signal reverts to low level.Therefore, overvoltage protection
Action sensitivity it is higher.
In addition, in the present embodiment, due to will be defeated after the comparative result delay stipulated time from the 2nd comparison circuit 16
Go out to release circuit 19, therefore, converter be stopped and cause power output end voltage drop to the 2nd threshold voltage with
When lower, lock-in circuit is not unlocked immediately, but be unlocked again after the stipulated time.Thus, it can ensure that in mistake
After voltage status releasing, i.e. output power recovers to recover the work of converter after stabilization again, thus, it is avoided that because of output power not
Stablize and cause to power off repeatedly.
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 the 1st bleeder circuit 11, the 1st comparison circuit the 12, the 1st isolation electricity
Road 13, lock-in circuit 14, the 2nd bleeder circuit 15, the 2nd comparison circuit 16, the 2nd isolation circuit 17, delay circuit 18 and unblock electricity
Road 19.
Wherein, the 1st comparison circuit 12 includes the 1st shunt regulator U2.1st shunt regulator U2 test side is via the 1st
Bleeder circuit 11 is connected with power output end, and negative electrode is successively via the 1st resistance R28 and the 2nd resistance R26 and power output end
It is connected, plus earth.1st bleeder circuit 11 is made up of resistance R25, resistance R34 and resistance R35.1st shunt regulator U2's
Test side is connected via resistance R25 and resistance R35 with power output end successively, and is grounded via resistance R34.It is in parallel the 1st
Between voltage-stablizer U2 test side and ground connection, the capacitor C12 for removing noise is parallel with.
1st isolation circuit 13 is made up of photoelectrical coupler U5, including the 1st light emitting diode D1 and the 1st phototriode P1.
1st light emitting diode D1 and the 1st resistance R28 is connected in parallel, the connecting line phase of its anode and the 1st resistance R28 and the 2nd resistance R26
Connection, negative electrode is connected with the 1st shunt regulator U2 negative electrode.1st phototriode P1 and the 1st light emitting diode D1 is carried out
Optical coupling.
Lock-in circuit 14 includes the 1st switch S1, diode D5 and PNP transistor Q2.1st switch S1 positive control end
Successively via the 3rd resistance R29, the 1st phototriode P1 emitter stage, the 1st phototriode P1 colelctor electrode and the 4th resistance
R33 and be connected with external power source.The external power source is the power supply independently of output power.Also, the 1st switch S1 positive control
End is also grounded via the 5th resistance R32.In addition, the 1st switch S1 negative control end ground connection, its 1st output end is 1. successively via the
6 resistance R31 and the 7th resistance R30 and be connected with external power source, 2. its 2nd output end is grounded.S1 is being switched to the 1st just
During control end input high level, 2. 1. its 1st output end turn on the 2nd output end.In addition, at the 1st switch S1 positive control end
Between ground connection, the capacitor C14 for removing noise is also parallel with.Diode D5 anode connects via the 8th resistance R23
Ground, negative electrode is connected with the 1st switch S1 positive control end.PNP transistor Q2 base stage and the 6th resistance R31 and the 7th resistance
R30 connecting line is connected, and emitter stage is connected with external power source, colelctor electrode via the 9th resistance R24 with diode D5 sun
Pole is connected.In addition, between PNP transistor Q2 base stage and emitter stage, being also parallel with the capacitor for removing noise
C13。
2nd comparison circuit 16 includes the 2nd shunt regulator U4.2nd shunt regulator U4 test side is via the 2nd partial pressure electricity
Road 15 is connected with power output end, and negative electrode is connected via the 10th resistance R15 and the 11st resistance R17 with power output end successively
Connect, plus earth.2nd bleeder circuit 15 is made up of resistance R18 and resistance R19.2nd shunt regulator U4 test side via
Resistance R19 is connected with power output end, and is grounded via resistance R18.In the 2nd shunt regulator U4 test side and ground connection
Between, it is parallel with the capacitor C10 for removing noise.
2nd isolation circuit 17 is made up of photoelectrical coupler U3, including the 2nd light emitting diode D2 and the 2nd phototriode P2.
2nd light emitting diode D2 and the 10th resistance R15 is connected in parallel, its anode and the 10th resistance R15 and the 11st resistance R17 connection
Line is connected, and negative electrode is connected with the 2nd shunt regulator U4 negative electrode.2nd phototriode P2 and the 2nd light emitting diode D2 enters
Row optical coupling, its colelctor electrode is connected via the 12nd resistance R22 with external power source, and emitter stage connects via the 13rd resistance R16
Ground.
In delay circuit 18, the series circuit that is made up of diode D7 and resistance R37, with by diode D6 and resistance
The series circuit that R36 is constituted is connected in parallel.Diode D7 negative electrode is connected with resistance R37, and anode is connected with resistance R36
Connect.Diode D6 negative electrode is connected with resistance R36, and anode is connected with resistance R37.Diode D6 anode is additionally coupled to
2 isolation circuit U3 the 2nd phototriode P2 colelctor electrode, so that the collector voltage for receiving the 2nd phototriode P2 comes
Delay process is carried out as control signal, and to the control signal.In addition, between diode D7 anode and ground connection, it is in parallel
It is connected with capacitor C16.It is adjusted by the capacitance to capacitor C16, the delay time of delay circuit 18 can be adjusted.
Release circuit 19 includes the 2nd switch S3 and the 3rd switch S4.2nd switch S3 positive control end and delay circuit 18
Diode D7 anode is connected, the control signal after reception delay processing.2nd switch S3 negative control end ground connection, it the 3rd
3. output end is connected via the 14th resistance R21 with external power source, and is grounded, its 4th output end via the 15th resistance R20
4. it is grounded.Wherein, to the 2nd switch S3 positive control end input low level when, the 3rd output end 3. with the 4th output end
4. disconnect.3. 3rd switch S4 positive control end is connected with the 2nd switch S3 the 3rd output end, its negative control end ground connection.3rd
Switch anode of S4 the 5th output end 5. with the diode D5 in lock-in circuit 14 to be connected, 6. its 6th output end is grounded.Its
In, in the positive control end input high level to the 3rd switch S4,6. 5. the 5th output end turn on the 6th output end.
In the present embodiment, as the output of lock-in circuit 14, diode D5 negative electrode is connected to switch S2 positive control
End, switch S2 negative control end ground connection.A S2 output head grounding is switched, another output end is connected to conversion (not shown)
Device, for converter output indication signal.Alternatively, it is also possible to replace switch S2 with FET, transistor etc..
Below, the overvoltage protection of the overvoltage protection 100 when power output end occurring overvoltage, which is acted, to be carried out
Explanation.
First, the power output end branch pressure voltage after the partial pressure of the 1st bleeder circuit 11 is inputted to the 1st shunt regulator U2's
Test side.The branch pressure voltage inputted the reference voltage internal with it is compared by the 1st shunt regulator U2.Work as electric power output
When overvoltage occurs for end, the branch pressure voltage inputted is higher than reference voltage, now, the 1st shunt regulator U2 negative electrode and anode
Turn on and be grounded, as low level.
Then, the 1st photoelectrical coupler U5 the 1st light emitting diode D1 negative electrode connects via the 1st shunt regulator U2
Ground, and its anode is then connected via the 2nd resistance R26 with power output end, is applied with the 1st light emitting diode D1 by exporting
Forward voltage that electric power is provided and light so that the 1st phototriode P1 colelctor electrode is turned on emitter stage.Due to the 1st
Phototriode P1 colelctor electrode is to be connected via the 4th resistance R33 with the external power source independently of output power, and the 1st
Light emitting diode D1 is then as power supply, it is thereby achieved that electrical isolation, can eliminate the fluctuation of power output end by output power
Influence to late-class circuit, becomes more stable the control to converter.
After the 1st phototriode is turned on, the high level signal that external power source is formed is via the 4th resistance R33, the 3rd electricity
Hinder R29 and put on the 1st positive control end for switching S1, so that 2. 1. the 1st switch S1 the 1st output end led with the 2nd output end
It is logical.Then, PNP transistor Q2 base stage is grounded via the 6th resistance R31, and its emitter stage is turned on colelctor electrode.Now, outside
The high level signal that portion's power supply is formed puts on diode D5 anode via the 9th resistance R24, and diode D5 conductings should
High level signal further puts on the 1st switch S1 positive control end by diode D5, so as to complete locking.In this feelings
Under condition, even if the 1st switchs high level signal on S1 positive control end, from the 1st phototriode P1 because of power output end
Overvoltage condition releasing and removed, lock-in circuit 14 can also maintain lock-out state, so as to make indication signal described later
Lasting output.
While the 1st switch S1 positive control end is locked as high level by lock-in circuit 14, S2 positive control will be also switched
End processed is locked as high level, therefore, switch S2 two output ends conducting, and overvoltage protection 100 continues defeated to converter
Go out low level indication signal.
Below, the autonomous recovery action of overvoltage protection 100 is illustrated.
First, the power output end branch pressure voltage after the partial pressure of the 2nd bleeder circuit 15 is inputted to the 2nd shunt regulator U4's
Test side.The branch pressure voltage inputted the reference voltage internal with it is compared by the 2nd shunt regulator U4.Stop in converter
After only working, the voltage of power output end slowly declines.When branch pressure voltage is less than reference voltage, the 2nd shunt regulator U4's
Negative electrode disconnects with anode.
Then, the 2nd photoelectrical coupler U3 the 2nd light emitting diode D2 stops lighting, so that the 2nd phototriode P2
Colelctor electrode disconnects with emitter stage.
Then, accumulate on capacitor C16 electric energy by diode D7, resistance R37 and the 13rd resistance R16 to be grounded into
Row electric discharge, makes the 2nd switch S3 positive control terminal voltage gradually decrease down low level.Thus, the 2nd S3 the 3rd output end is switched 3.
4. disconnected with the 4th output end, thus the 3rd switch S4 positive control end turn into high level, the 3rd switch S4 the 5th output end 5. with
6. 6th output end turns on.
Then, in lock-in circuit 14, flowed to originally from external power source via PNP transistor Q2, the 9th resistance R24
Diode D5 electric current directly flows to ground connection via the 3rd switch S4, and diode D5 ends, and diode D5 negative electrode reverts to low
Level.Also, because the power output end branch pressure voltage now after the 1st bleeder circuit partial pressure is inevitably less than the 1st parallel voltage-stabilizing
Reference voltage inside device, therefore, the cut-off of the 1st phototriode, the connecting line between the 3rd resistance R29 and the 5th resistance R32
As low level.Thus, the 1st switch S1 and switch S2 positive control end on voltage all turn into low level, the 1st switch S1 and
Switch S2 to disconnect, lock-in circuit 14 unlocks and stops output indication signal, the state so that converter is resumed work.
In addition, the action in converter is " continuous current mode (CCM：Continuous Conduction Mode) "
In the case of, because overvoltage protection monitors, therefore, converter or switch element to the voltage of power output end all the time
In cyclical action.Thus, there is the problem of needing to improve heat dispersion.
And in the present embodiment, due to realizing overvoltage protection using discrete component device, therefore, with using core
The structure of piece, which is compared, easily to be radiated.Thus, the utility model can be suitably used for the electrical power conversion using " continuous current mode "
Device.
In addition, can also for example increase a switch between release circuit and lock-in circuit.By disconnecting the switch, energy
Release circuit is prevented to send unlock instruction to lock-in circuit, even if realizing overvoltage condition solution so as to the requirement according to user
Except converter is resumed work automatically " thorough Disconnected mode ".
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
11 the 1st bleeder circuits
12 the 1st comparison circuits
13 the 1st isolation circuits
14 lock-in circuits
15 the 2nd bleeder circuits
16 the 2nd comparison circuits
17 the 2nd isolation circuits
18 delay circuits
19 release circuits
100 overvoltage protections
200 converters
The shunt regulators of U2 the 1st
The resistance of R28 the 1st
The resistance of R26 the 2nd
The photoelectrical couplers of U5 the 1st
The light emitting diodes of D1 the 1st
The phototriodes of P1 the 1st
The resistance of R29 the 3rd
The resistance of R33 the 4th
The resistance of R32 the 5th
S1 the 1st is switched
The resistance of R31 the 6th
The resistance of R30 the 7th
D5 diodes
The resistance of R23 the 8th
The resistance of R24 the 9th
Q2 PNP transistors
The shunt regulators of U4 the 2nd
The resistance of R15 the 10th
The resistance of R17 the 11st
The photoelectrical couplers of U3 the 2nd
The light emitting diodes of D2 the 2nd
The phototriodes of P2 the 2nd
The resistance of R22 the 12nd
The resistance of R16 the 13rd
S3 the 2nd is switched
The resistance of R21 the 14th
The resistance of R20 the 15th
S4 the 3rd is switched
CNT41 controls circuit
P11 light emitting diodes
P41 phototriodes
LT41 lock-in circuits
Q41 p-type MOS transistors
T transformers
Q51 switching transistors
Q52, Q53 controlling transistor
PC1, PC2 photoelectrical coupler
TL shunt regulators.
Claims (11)
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, for
The converter sends the indication signal, so as to when overvoltage occurs for the voltage for detecting the power output end, indicate
The converter is stopped, and when the voltage for detecting the power output end is less than assigned voltage, stops sending described refer to
Show signal, the state so that converter is resumed work.
2. power inverter as claimed in claim 1, it is characterised in that
The overvoltage protection includes：
1st comparison circuit, the input of the 1st comparison circuit is connected via the 1st bleeder circuit with the power output end, will
The voltage of the power output end is compared with the 1st threshold voltage, exceedes the 1st threshold in the voltage of the power output end
During threshold voltage, lock instruction is exported；And
Lock-in circuit, the lock-in circuit is connected with the converter, is receiving the lock from the 1st comparison circuit
When instructing surely, export the indication signal to the converter and locked.
3. power inverter as claimed in claim 2, it is characterised in that
1st comparison circuit includes the 1st shunt regulator, and the test side of the 1st shunt regulator is via the 1st partial pressure electricity
Road is connected with the power output end, and negative electrode is connected via the 1st resistance and the 2nd resistance with the power output end successively,
Plus earth.
4. power inverter as claimed in claim 3, it is characterised in that
The overvoltage protection also include the 1st isolation circuit, the 1st isolation circuit be connected to the 1st comparison circuit with
Between the lock-in circuit, electrical isolation is carried out to the 1st comparison circuit and the lock-in circuit,
1st isolation circuit includes：
1st light emitting diode, the 1st light emitting diode is connected with the 1st resistor coupled in parallel, its anode and the 1st resistance and
The connecting line of 2nd resistance is connected, and negative electrode is connected with the negative electrode of the 1st shunt regulator；And
1st phototriode, the 1st phototriode is optically coupled with the 1st light emitting diode.
5. power inverter as claimed in claim 4, it is characterised in that
The lock-in circuit includes：
1st switch, the positive control end of the 1st switch is successively via the 3rd resistance, emitter stage of the 1st phototriode, described
The colelctor electrode of 1st phototriode and the 4th resistance and be connected with the external power source independently of the output power, and via
5 resistance and be grounded, the negative control end ground connection of the 1st switch, the 1st output end of the 1st switch successively via the 6th resistance and
7th resistance and be connected with the external power source, it is described 1st switch the 2nd output head grounding, wherein, to the 1st switch
During the input high level of positive control end, the 1st output end is turned on the 2nd output end；
Diode, the anode of the diode is grounded via the 8th resistance, and negative electrode is connected with the positive control end of the described 1st switch；
And
PNP transistor, the base stage of the PNP transistor is connected with the connecting line of the 6th resistance and the 7th resistance,
Emitter stage is connected with the external power source, and colelctor electrode is connected via the 9th resistance with the anode of the diode.
6. power inverter as claimed in claim 2, it is characterised in that
The overvoltage protection also includes：
2nd comparison circuit, the input of the 2nd comparison circuit is connected via the 2nd bleeder circuit with the power output end, will
The voltage of the power output end is compared with the 2nd threshold voltage, and exports comparative result；And
Release circuit, the release circuit is connected to the lock-in circuit, and reception compares knot from the described of the 2nd comparison circuit
Really, it is defeated to the lock-in circuit when the comparative result is less than 2 threshold voltage for the voltage of the power output end
Go out unlock instruction, to unlock, the lock-in circuit is stopped the output indication signal.
7. power inverter as claimed in claim 6, it is characterised in that
2nd comparison circuit includes the 2nd shunt regulator, and the test side of the 2nd shunt regulator is via the 2nd partial pressure electricity
Road is connected with the power output end, and negative electrode is connected via the 10th resistance and the 11st resistance with the power output end successively
Connect, plus earth.
8. power inverter as claimed in claims 6 or 7, it is characterised in that
The overvoltage protection also includes：
Delay circuit, the delay circuit is connected between the 2nd comparison circuit and the release circuit, will come from the described 2nd
Exported after the comparative result delay stipulated time of comparison circuit to the release circuit.
9. power inverter as claimed in claim 7, it is characterised in that
The overvoltage protection also include the 2nd isolation circuit, the 2nd isolation circuit be connected to the 2nd comparison circuit with
Between the release circuit, electrical isolation is carried out to the 2nd comparison circuit and the release circuit,
2nd isolation circuit includes：
2nd light emitting diode, the 2nd light emitting diode is connected with the 10th resistor coupled in parallel, its anode and the 10th resistance
It is connected with the connecting line of the 11st resistance, negative electrode is connected with the negative electrode of the 2nd shunt regulator；And
2nd phototriode, the 2nd phototriode is optically coupled with the 2nd light emitting diode, and its colelctor electrode is via
12 resistance and be connected with the external power source independently of the output power, emitter stage is grounded via the 13rd resistance,
When the voltage of the power output end is less than 2 threshold voltage, the overvoltage protection utilizes the described 2nd
The emitter voltage of phototriode, low level control signal is exported to the release circuit.
10. power inverter as claimed in claim 9, it is characterised in that
The release circuit includes：
2nd switch, the positive control end of the 2nd switch receives the control signal, the negative control end ground connection of the 2nd switch, institute
The 3rd output end for stating the 2nd switch is connected via the 14th resistance with the external power source, and is grounded via the 15th resistance,
4th output head grounding of the 2nd switch, wherein, in the positive control end input low level to the 2nd switch, the described 3rd is defeated
Go out end to disconnect with the 4th output end；And
3rd switch, the 3rd switch positive control end with the described 2nd switch the 3rd output end be connected, it is described 3rd switch bear
Control end is grounded, and the 5th output end of the 3rd switch is connected with the anode of the diode, and the 6th of the 3rd switch is defeated
Go out end ground connection, wherein, in the positive control end input high level to the 3rd switch, the 5th output end and the described 6th output
End conducting.
11. the power inverter as described in claim 9 or 10, it is characterised in that
The overvoltage protection also includes：
Delay circuit, the delay circuit is connected between the 2nd isolation circuit and the release circuit, will come from the described 2nd
Exported after the comparative result delay stipulated time of comparison circuit to the release circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463958.5U CN206559224U (en) | 2016-12-29 | 2016-12-29 | Power inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463958.5U CN206559224U (en) | 2016-12-29 | 2016-12-29 | Power inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206559224U true CN206559224U (en) | 2017-10-13 |
Family
ID=60358432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621463958.5U Active CN206559224U (en) | 2016-12-29 | 2016-12-29 | Power inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206559224U (en) |
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 |
-
2016
- 2016-12-29 CN CN201621463958.5U patent/CN206559224U/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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105305797B (en) | A kind of DC/DC power supplys output overvoltage under-voltage protecting circuit | |
| CN111983298B (en) | Switching value acquisition circuit and method | |
| CN103427395B (en) | Open circuit protection circuit, open circuit protection method and lighting device | |
| CN112868153B (en) | A converter, method and system applied to a photovoltaic power generation system | |
| CN202696122U (en) | Short-circuit protection circuit of multiplexed output power and electronic equipment | |
| CN217037504U (en) | LED dimming circuit and dimming LED lamp | |
| CN106788381A (en) | A kind of switching value input circuit for relay-protection tester | |
| CN206559224U (en) | Power inverter | |
| CN209886852U (en) | Protection circuit for welding machine wire feeding power supply output short circuit | |
| WO2020164199A1 (en) | Component voltage limiting method and application device and system thereof | |
| CN115002963A (en) | Low standby power consumption control circuit | |
| CN207304400U (en) | A kind of driving power | |
| CN206517293U (en) | Power inverter | |
| CN109412398A (en) | Dash current inhibits mould group, method and power supply device | |
| CN109755923B (en) | Protection circuit, method and equipment of power supply device | |
| CN216531069U (en) | Current equalizing circuit and display device | |
| CN214337797U (en) | PFC power supply module | |
| CN212969053U (en) | Integrated CT induction power taking circuit and device | |
| CN211239325U (en) | Intermediate frequency power supply linkage protection control system | |
| CN212627129U (en) | Matrix type IGBT overcurrent protection circuit | |
| CN212969142U (en) | Integrated CT induction power supply device | |
| CN210201476U (en) | Direct current microgrid DC-DC converter and protection system | |
| CN104684177B (en) | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment | |
| CN204145324U (en) | A kind ofly change the circuit that wide region alternating current-direct current input voltage is DC low-voltage | |
| CN210074760U (en) | Switching power supply output overvoltage protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |