CN110521076A - Power supply device - Google Patents
Power supply device Download PDFInfo
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- CN110521076A CN110521076A CN201880026156.3A CN201880026156A CN110521076A CN 110521076 A CN110521076 A CN 110521076A CN 201880026156 A CN201880026156 A CN 201880026156A CN 110521076 A CN110521076 A CN 110521076A
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- Prior art keywords
- capacitor
- discharging resistor
- power supply
- rectifier
- supply device
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of power supply device, comprising: rectifier, the rectifier are configured as the AC electrical power conversion supplied from AC power supplies being DC electric power；Smooth unit, the smooth unit are configured as keeping DC electric power smooth；Inverter, the inverter are configured as that AC electric power will be converted to by the smooth DC electric power of smooth unit；And abnormality detecting unit, it is abnormal which is configured as detection.Smooth unit includes: capacitor, which is connected in parallel in the output of rectifier；Discharging resistor, the discharging resistor are configured as making capacitor discharge；And switching device, the switching device are connected in series in discharging resistor.When abnormality detecting unit detects it is abnormal when, closure switch device, and when the switching device is closed, capacitor passes through discharging resistor and discharges.
Description
Technical field
The present invention relates to a kind of power supply devices.
Background technique
The DC-to-AC converter of the prior art generates DC power supply from AC power supplies, by the switching device for controlling inverter circuit
On/off and the smooth circuit by being made of reactor and smoothing capacity device exports from DC and obtains AC output, and will be high
Frequency AC electric power is applied to the heating coil for induction heating.In the DC-to-AC converter, for scheduled discharge time it is normal
The discharging resistor and smoothing capacity device of several pairs of smoothing capacity devices electric discharge are connected in parallel (for example, with reference to JP3419641B2).
When discharging resistor and smoothing capacity device are connected in parallel, electric power is always consumed by discharging resistor.When increase is put
When the resistance value of electric resistor is to reduce the electric power consumed by discharging resistor, discharge time constant increases, and to smooth
Capacitor discharge takes a long time.When, there are when charge, charge is likely to become inspection or repairs circuit in smoothing capacity device
Barrier.To when generating abnormal in a device, it is desirable that smoothing capacity device rapidly discharges (for example, in 10 seconds).
Induction heating of the DC-to-AC converter of the prior art for cooking apparatus as such as pot, and have lesser
Output, and smoothing capacity device also has lower capacitor.Therefore, although increasing the resistance value of discharging resistor to increase electric discharge
Time constant, but influence slight.As example, when capacitor of the smoothing capacity device with 9 μ F and discharging resistor has
When the resistance value of 240k Ω, discharge time constant is set as about 2 seconds.
However, the power supply device with higher output used in the welding operation of heat treatment or the electrical resistance welding tube of steel
In, smoothing capacity device also has high capacitance.Particularly, it is desirable that power supply device used in welding kesistance welded pipe has low line
Wave, and high capacitor of the smoothing capacity device with tens of thousands of μ F that this power supply device uses.When the capacitor picture of smoothing capacity device
When values above is equally high, the increase of the resistance value of discharging resistor increases discharge time constant significantly.On the other hand, work as electric discharge
When the resistance value of resistor reduces, increased by the amount of the electric power of discharging resistor consumption.In addition, in power consumption and resistor
Multiple resistors may be needed in relationship between rated value.In this case, the manufacturing cost and operating cost of power supply device
It can increase, while the size of power supply device increases.
Summary of the invention
Illustrative aspect of the invention provides a kind of power supply device, which can make to wrap in an exceptional case
The capacitor included in smooth unit rapidly discharges, and reduces and lose in normal time.
Illustrative aspect according to the present invention, a kind of power supply device include: rectifier, which is configured as will be from AC
The AC electrical power conversion of power supply is DC electric power；Smooth unit, the smooth unit are configured as making from rectifier output
DC electric power including ripple is smooth；Inverter, the inverter are configured as to turn by the smooth DC electric power of the smooth unit
It is changed to AC electric power；Shell, the rectifier, the smooth unit and the inverter are contained in the shell；And abnormal inspection
Unit is surveyed, which is configured as detecting at least one of the rectifier, the inverter and described shell
Exception.The smooth unit includes: at least one capacitor, which is connected in parallel in the rectifier
Output；First discharging resistor, first discharging resistor are configured as making the capacitor discharge；And switching device, this is opened
It closes device and is connected in series in first discharging resistor.When the abnormality detecting unit detects abnormal, the abnormal inspection
It surveys unit and is closed the switching device, and when switching device closure, the capacitor passes through the first electric discharge electricity
Hinder device electric discharge.
Detailed description of the invention
Fig. 1 is the block diagram for illustrating power supply device according to the embodiment.
Fig. 2 is the circuit diagram for illustrating the smooth unit of power supply device of Fig. 1.
Fig. 3 is the circuit diagram for illustrating the variation of the smooth unit of power supply device of Fig. 1.
Fig. 4 is the block diagram for illustrating the power supply device according to another embodiment.
Fig. 5 is the circuit diagram for illustrating the control unit of power supply device of Fig. 4.
Fig. 6 is the circuit diagram for illustrating the control unit of power supply device of Fig. 4.
Specific embodiment
Fig. 1 illustrates an example of power supply device according to the embodiment.Fig. 2 illustrates an example of smooth unit.
Power supply device 1 includes: rectifier 3, which is used to be DC electricity by the AC electrical power conversion supplied from AC power supplies 2
Power；Smooth unit 4, the DC electric power which is used to make to have ripple and export from rectifier 3 are smooth；And inverter
5, the inverter 5 is for will be converted to AC electric power by the smooth DC electric power of smooth unit 4.In the present embodiment, power supply device 1 is gone back
Including breaker 6, which supplies for being cut off when overcurrent flows to rectifier 3 from AC power supplies 2 to the electric power of rectifier 3
It gives, and rectifier 3, smooth unit 4, inverter 5 and breaker 6 are contained in shell 7.
Rectifier 3 can be used diode bridge and be rectified, or all using that can be connected based on external signal control
The semiconductor device as thyristor changeably rectifies smooth D/C voltage.When using semiconductor device, semiconductor device
Conducting controlled by control unit 8.
Inverter 5 includes full-bridge circuit, which includes four power for being for example able to carry out switch operation
Semiconductor device, and high-frequency AC electric power is generated by the operation of the predetermined switch of four power semiconductor arrangements.Six can be passed through
High frequency output is set as three-phase output by a power semiconductor arrangement.The switch of power semiconductor arrangement is operated by control unit 8
Control.
At this point, being able to use such as insulated gate bipolar transistor (IGBT) and metal oxidation as power semiconductor arrangement
The such various types of power semiconductor arrangements for being able to carry out switch operation of object semiconductor field effect transistor (MOSFET),
And silicon (Si) or silicon carbide (SiC) can be used as semiconductor material.
Load 9 including heating coil is connected to the output of inverter 5, and the high-frequency AC electric power generated by inverter 5
It is applied to heating coil.In addition, heating target passes through heating coil induction heating.Heating target and heating purpose are not limited especially
System, and can exemplify and be operated for the heat treatment (quenching etc.) of steel and the welding for electrical resistance welding tube.
As shown in Fig. 2, smooth unit 4 includes capacitor 10, reactor 11, the first discharging resistor 12, second electric discharge electricity
Hinder device 13 and switching device 14.
Capacitor 10 is connected in parallel in the output of rectifier 3, and eliminating or reducing includes in the DC electric power of rectifier 3
Ripple.The capacitor of capacitor 10 is suitably set according to the output of power supply device 1.For example, the output when power supply device 1 is set
It can be about 20000 μ F by the capacitance settings of capacitor 10 (however, capacitor is with very low ripple when being about 300kW
The value of power supply device).At this point it is possible to use capacitor can easily increased electrolytic capacitor it is but electric as capacitor 10
Container 10 is not limited to electrolytic capacitor.
In the present embodiment, reactor 11 is plugged on the anode of the output of rectifier 3 and the capacitor for being connected to side of the positive electrode
Between 10 terminal.Reactor 11 and capacitor 10 are formed together low-pass filter, and promote ripple and eliminate ability.
First discharging resistor 12 is connected in series with each other with switching device 14, and the first discharging resistor being connected in series
12 and switching device 14 be connected in parallel in the output of rectifier 3.Switching device 14 can be beaten based on external signal by control unit 8
Opening/closing conjunction.When switching device 14 is closed (conduction), capacitor 10 is put by the first discharging resistor 12 and switching device 14
Electricity.
The member with mechanical contacts as such as magnetic switch of opened/closed by using electromagnet attraction dynamic iron
Part, or semiconductor device as such as thyristor are used as switching device 14.It may be preferred, however, that ground was used with the long-life
Semiconductor device, rather than the element with mechanical contacts.
Second discharging resistor 13 is connected in parallel in the first discharging resistor 12, and capacitor 10 is put always by second
Electric resistor 13 discharges.Second discharging resistor 13 has the resistance value bigger than the first discharging resistor 12.For example, the first electric discharge
The resistance value of resistor 12 is several hundred Ω, and the range of the resistance value of the second discharging resistor 13 is from tens k Ω to several hundred k
Ω。
When overcurrent flows to rectifier 3 from AC power supplies 2, breaker 6 cuts off the power supply to rectifier 3, and works as
It will indicate that the abnormal abnormal signal of rectifier 3 is transmitted to control unit 8 when cutting off the power supply to rectifier 3.
For example, control unit 8 includes the processor as major part.The power that control unit 8 controls inverter 5 is partly led
The switch of body device operates, and the semiconductor as control such as thyristor when using semiconductor device in rectifier 3
The conducting of device.When abnormal signal is inputted from breaker 6,8 closure switch device 14 of control unit.
When switching device 14 is closed, other than the second discharging resistor 13, capacitor 10 also passes through the first electric discharge electricity
Device 12 is hindered to discharge.The resistance value (for example, several hundred Ω) of first discharging resistor 12 compares the resistance value (example of the second discharging resistor 13
Such as, tens k Ω are small to several hundred k Ω), and are stored in most of charge in capacitor 10 and flow to the first discharging resistor 12.
Voltage between terminals due to discharging resistor relative to capacitor 10 have lesser resistance value, so flowing through discharging resistor
Electric current increases.When breaker 6 and control unit 8 detect the exception of rectifier 3, capacitor 10 can be by with small resistance
First discharging resistor 12 of value rapidly discharges.For example, when capacitor of the capacitor 10 with 20000 μ F and the first electric discharge electricity
When hindering device 12 has the resistance value of 300 Ω, discharge time constant is set to about six seconds.
From the viewpoint of the stability for preventing fever, the resistor being powered always is with about 1/4 operation of rated power.
However, the charge being stored in capacitor 10 only flows to the first electric discharge electricity when closure switch device 14 in an exceptional case
Device 12 is hindered, and fever relevant to the conducting of the first discharging resistor 12 is interim.Therefore, 12 energy of the first discharging resistor
Enough upper limits or Near The Upper Limit with rated power operate.Therefore, the resistor for constituting the first discharging resistor 12 can be reduced
Quantity can reduce the manufacturing cost of power supply device 1, and can reduce the size of power supply device 1.For example, when AC power supplies 2
Output voltage is 440V and when rectifier 3 rectified by diode bridge, and the output voltage of rectifier 3 becomes about
600V.Moreover, the electric current for flowing through the first discharging resistor 12 is maximum when the resistance value of the first discharging resistor 12 is 300 Ω
It is 2A, and the power consumption maximum of the first discharging resistor 12 is 1200W.In this case, when use such as enamelled resistor
When there is the resistor of high nominal power as device, a resistor can be passed through and realize the first discharging resistor 12.This
It is because the first discharging resistor 12 is only used during electric discharge and used in the very low method of utilization rate.
When 1 normal operating of power supply device and when stopping normal time, that is, when not detecting abnormal, electricity is not turned on
To the first discharging resistor 12, and electric power is not consumed by the first discharging resistor 12.Therefore, the behaviour of power supply device can be reduced
Make cost.
In order to make capacitor 10 rapidly discharge in an exceptional case, it is convenient to omit the second discharging resistor 13.However,
Preferably, when the second discharging resistor 13 and power supply device 1 is arranged normally operating and stopping, capacitor 10 always by
The electric discharge of second discharging resistor 13.For example, the voltage between terminals of capacitor 10 may be in mistake when the charging of capacitor 10 starts
It crosses in state and temporarily rises.However, since capacitor 10 is by the electric discharge of the second discharging resistor 13, it will be excessive so being able to suppress
Voltage be applied to inverter 5, and the power semiconductor arrangement of inverter 5 can be protected.
For example, the resistance value due to the second discharging resistor 13 is more much higher than the resistance value of the first discharging resistor 12, electricity
The range of resistance value is from tens k Ω to several hundred k Ω, so the electric current for flowing through the second discharging resistor 13 is extremely low, for example, electric current
Range is from several mA to tens mA.Therefore, although the second discharging resistor 13 always consumes electric power, power consumption is very low.
Fig. 3 illustrates the variation of smooth unit 4.
In examples as shown in figure 3, smooth unit 4 includes first capacitor device 21 and the second capacitor 22, is connected as parallel connection
It is connected to the capacitor of the output of rectifier 3.First capacitor device 21 is connected by diode 20, and the second capacitor 22 directly connects
It connects.Smooth unit 4 further includes the first discharging resistor 23, the second discharging resistor 24, third discharging resistor 25 and switch dress
Set 26.
First discharging resistor 23 is connected in series with each other with switching device 26, and the first discharging resistor being connected in series
23 and switching device 26 be connected in parallel in first capacitor device 21.Switching device 26 can be beaten based on external signal by control unit 8
Opening/closing conjunction.
Second discharging resistor 24 is connected in parallel in the first discharging resistor 23, and first capacitor device 21 is always by
The electric discharge of two discharging resistors 24.It, can be by the second discharging resistor 24 in order to reduce the power consumption of the second discharging resistor 24
Resistance value be set as the resistance value bigger than the first discharging resistor 23.For example, the resistance value of the first discharging resistor 23 is several
Hundred Ω, and the range of the resistance value of the second discharging resistor 24 is from tens k Ω to several hundred k Ω.
Third discharging resistor 25 is connected in parallel in the second capacitor 22, and the second capacitor 22 is put always by third
Electric resistor 25 discharges.It, can be by the electricity of third discharging resistor 25 in order to reduce the power consumption of third discharging resistor 25
Resistance value is set as the resistance value bigger than the first discharging resistor 23.For example, the resistance value of the first discharging resistor 23 is several hundred Ω,
And the range of the resistance value of third discharging resistor 25 is from tens k Ω to several hundred k Ω.
When the voltage between terminals of first capacitor device 21 are lower than the voltage between terminals of the second capacitor 22, pass through diode 20
And the first capacitor device 21 connecting with the output-parallel of rectifier 3 discharges.Therefore, it substantially eliminates or subtracts by the second capacitor 22
The ripple in the output for including rectifier 3 is lacked.As the capacitor 10 of smooth unit 4 as shown in Figure 2, the second capacitor
22 discharge always by third discharging resistor 25, this makes it possible to inhibit the voltage between terminals of the second capacitor 22 in transition shape
It is increased under state, while protecting the power semiconductor arrangement of inverter 5.First capacitor device 21 and diode 20 and the second discharge resistance
Device 24 is formed together transient voltage suppression circuit, and also inhibits the voltage between terminals of the second capacitor 22 under the transient state
It increases.Due to inhibiting the voltage between terminals of the second capacitor 22 to increase under the transient state by transient voltage suppression circuit, institute
Can be omitted third discharging resistor 25.
Preferably, first capacitor device 21 can have the capacitor lower than the second capacitor 22, and for example, can be suitably
The service life thin film capacitor longer than electrolytic capacitor is as the first capacitor device 21 with lower capacitor.
In the embodiment shown in fig. 3, when overcurrent flows to rectifier 3 from AC power supplies 2, breaker 6 is cut off to rectification
The power supply of device 3 and abnormal signal is transmitted to control unit 8 from breaker 6, so that passing through 8 closure switch of control unit
Device 26.When closure switch device 26, other than the second discharging resistor 24, first capacitor device 21 is put by first first
Electric resistor 23 discharges.The resistance value (for example, several hundred Ω) of first discharging resistor 23 compares the resistance of the second discharging resistor 24
Value (for example, tens k Ω are small to several hundred k Ω), and are stored in most of charge in first capacitor device 21 and flow to the first electric discharge
Resistor 23, so that first capacitor device 21 is rapidly discharged by the first discharging resistor 23.When the electric discharge of first capacitor device 21 makes
When obtaining the voltage between terminals of first capacitor device 21 becomes lower than the voltage between terminals of the second capacitor 22, the second capacitor 22 also leads to
Cross 23 repid discharge of the first discharging resistor.For example, when first capacitor device 21 has the capacitor of 7000 μ F, the second capacitor 22 tool
There is a capacitor of 20000 μ F, and when the first discharging resistor 23 has the resistance value of 300 Ω, discharge time constant is set as
About eight seconds.
In the present invention, it has been described that determined in power supply device 1 when overcurrent flows to rectifier 3 from AC power supplies 2
It is abnormal, and detects the exception of rectifier 3 by breaker 6 and control unit 8.However, it is possible to which the enabling of shell 7 is examined
Survey the exception for power supply device 1.E.g., including the enabling detection unit of switch or sensor appropriate is installed on the door of shell 7
Or at doorframe, and it is switched on or switched off according to the enabling of shell 7, and logical based on the ON/OFF state of enabling detection unit
Cross the enabling that control unit 8 detects shell 7.Switch dress when detecting the enabling of shell 7, in smooth unit 4 shown in Fig. 2
It sets 14 to be closed by control unit 8, and capacitor 10 is rapidly discharged by the first discharging resistor 12.In addition, shown in Fig. 3
Smooth unit 4 in switching device 26 be closed by control unit 8, and first capacitor device 21 and the second capacitor 22 pass through
First discharging resistor 23 rapidly discharges.
About the exception of power supply device 1, the exception of inverter 5 can detecte.Reference Fig. 4 to 6 is described into the different of inverter 5
Normal and its detection method.In addition, benefit is denoted with the same reference numerals element identical with the element of above-mentioned power supply device 1, and
And its detailed description will be omitted or simplified.
Control unit 8 includes phase-locked loop circuit (hereinafter, simply referred to as " PLL circuit ") 30 and abnormal detection circuit 31.
PLL circuit 30 controls the frequency of the AC electric power exported from inverter 5, so that the frequency of AC electric power becomes being connected to inverter 5
The resonant frequency of load 9.Inverter 5 include for detect be applied to load 9 electric current I1 current transformer 32 and for detect apply
It is added on the transformer 33 of the voltage V1 of load 9.
As shown in figure 5, PLL circuit 30 includes phase-comparison circuit 40, analog adder/subtracter 41, voltage control vibration
Swing device 42 and control signal circuit 43.Phase-comparison circuit 40 detects the phase of the electric current I1 detected by current transformer 32 and by transformation
The phase for the voltage V1 that device 33 detects.Analog adder/subtracter 41 increases according to the phase that is detected by phase-comparison circuit 40/
Reduce preset frequency setting value.Voltage-controlled oscillator 42 is with corresponding with the voltage exported from analog adder/subtracter 41
Frequency output signal.According to the frequency of the signal exported from voltage-controlled oscillator 42, control signal circuit 43 believes control
Number it is transmitted to the control terminal g1 to g4 of the power semiconductor arrangement M1 to M4 of inverter 5.
PLL circuit 30 controls the operating frequency of inverter 5, is supplied to the electric current I1 of load 9 with elimination and is applied to load 9
Voltage V1 between phase shift, and from inverter 5 export AC electric power frequency with include inductive component L and capacitive component C
Load 9 resonant frequency it is consistent.Therefore, it can be improved the efficiency of power supply device 101.
However, loading 9 resistance when a part of short circuit or the generation such as open circuit for the circuit for loading 9 sides are such abnormal
Resistance to rapid changes, and resonant frequency significant changes.Then, PLL circuit 30 adjusts the operating frequency of inverter 5, so that operation
The resonant frequency of frequency following load 9.Under the transient state, high current or voltage may be instantaneously generated in inverter 5, and
Damage power semiconductor arrangement M1 to M4.Particularly, when the phase of electric current I1 advances to electricity due to the change of the impedance of load 9
When pressing the phase of V1, it is possible to create high surge voltage, and power semiconductor arrangement M1 to M4 may be damaged due to surge voltage
It is bad.Abnormal detection circuit 31 constitutes phase shift detection unit with current transformer 32 and transformer 33 together, and detects by current transformer 32
Phase shift between the electric current I1 of detection and the voltage V1 detected by transformer 33.
The electric current I1 detected by current transformer 32 and the voltage V1 detected by transformer 33 are input to abnormal detection circuit 31.Such as
Shown in Fig. 6, abnormal detection circuit 31 includes waveform shaper 50, waveform shaper 51, data trigger 52, trigger 53, ratio
Compared with device 54 and inverting units 55.The waveform of input voltage V1 is adjusted to scheduled square wave by waveform shaper 50.Waveform shaper
The waveform of input current I1 is adjusted to scheduled square wave by 51.Data trigger 52 is used as between detection voltage V1 and electric current I1
The phase shift detection unit of phase shift.Trigger 53 is used as the latch for keeping the output of data trigger 52.Comparator 54 detects electricity
Whether the size of stream I1 has reached a reference value.The output signal of the reversion comparator 54 of inverting units 55.
Waveform shaper 50 includes: resistor 50A, and resistor 50A has and the voltage that inputs to data trigger 52
Corresponding DC resistance value；With capacitor 50B, capacitor 50B includes unnecessary in the waveform of voltage V1 for being truncated
Harmonic component.Waveform shaper 51 includes: resistor 51A, and resistor 51A has and the voltage that inputs to data trigger 52
Corresponding DC resistance value；With capacitor 51B, capacitor 51B includes unnecessary in the waveform of electric current I1 for being truncated
Harmonic component, as waveform shaper 50.
Data trigger 52 includes the number for receiving the input end of clock mouth CL of clock signal, signal for receiving data
According to input port D, the set input mouth S for receiving set signal, the RESET input mouth R for receiving reset signal and
For transmitting the set signal port Q of set signal under SM set mode.When clock signal and data-signal input simultaneously, number
It is set to SM set mode according to trigger 52, and transmits set signal from set signal port Q.
Comparator 54 is used to compare the size for the AC signal for being separately input to two input ports.One of comparator 54 is defeated
Inbound port receives the AC signal for indicating to be applied to the value of electric current I1 of load 9.Another input port of comparator 54, which receives, to be made
For the AC signal of preset reference value, the AC signal is by obtaining scheduled AC voltage V2 partial pressure using variable resistance 56.
When electric current I1 becomes higher than a reference value, comparator 54 exports normal operation signal.Normal operation signal passes through inverting units 55
Reversion, and it is sent to the RESET input mouth R of data trigger 52.Comparator 54, inverting units 55 and variable resistance 56
Exposure mask (mask) unit 57 is formed, which is continuously output to reset signal data trigger 52, until electric current
Until the value of I1 becomes higher than a reference value.
In above-mentioned configuration, until the operation of the power supply device 1 until power supply device 1 has activated reaches normal condition,
Or specifically until the operating frequency of inverter 5, electric current I1 that is consistent with the resonant frequency of load 9 and being supplied to load 9 becomes
Must be higher than a reference value, reset signal is continuously output to data trigger 52 by mask cell 57, and suspends abnormality detection electricity
The phase shift detection on road 31 operates.Therefore, can eliminate when be supplied to load 9 electric current I1 is unstable and phase not with voltage one
The failure that the power supply device 1 of cause may occur when being forced and being stopped immediately after activation.In addition, working as the operation of power supply device 1
When reaching normal condition, start the phase shift detection operation of abnormal detection circuit 31.
When the resonant frequency of load 9 is consistent with the operating frequency of inverter 5 and voltage V1 and the phase of electric current I1 are mutual
When consistent, data trigger 52 maintains reset state and is not transitioning to SM set mode, does not set from set signal port Q transmission
Position signal, and the operation of power supply device 1 continues without changing.
On the other hand, when the operating frequency for the resonant frequency deviation inverter 5 that 9 are abnormal and loaded in load 9
When, the phase of voltage V1 and the phase of electric current I1 be not consistent with each other, and phase shift becomes the exception of inverter 5.In such shape
Under, data trigger 52 is changed into SM set mode, and transmits set signal from set signal port Q.Set signal is as table
Show that the abnormal abnormal signal of inverter 5 is input to PLL circuit 30 by trigger 53.
The PLL circuit 30 for receiving abnormal signal suitably disconnects power semiconductor arrangement M1 to M4 and stops to load 9
Power supply, and thereby protect power semiconductor arrangement M1 to M4.Abnormal signal continuously exports, until trigger 53 is multiple
Position.Switching device 4 in smooth unit 4 shown in Fig. 2 is closed by control unit 8, the PLL of the control unit 8 inside it
Abnormal signal is transmitted and received between circuit 30 and abnormal detection circuit 31, and capacitor 10 passes through the first discharging resistor 12
Rapidly discharge.In addition, the switching device 26 in smooth unit 4 shown in Fig. 3 is closed, and first capacitor device 21 and the second electricity
Container 22 is rapidly discharged by the first discharging resistor 23.
It, can be according to the phase shift between electric current I1 and voltage V1 rapidly according to the method for detecting abnormality of above-mentioned inverter 5
Detect the exception of the inverter 5 as caused by the variation of the resonant frequency of load 9.Thus, it is possible in the operation frequency of control inverter 5
Before rate follows the operation of the PLL circuit 30 of the resonant frequency of load 9 to terminate, the exception of inverter 5 is reliably detected.In addition,
When detecting the exception of inverter 5, the power semiconductor arrangement M1 to M4 of inverter 5 can be suitably disconnected, and thereby pre-
First prevent the damage of power semiconductor arrangement M1 to M4.
The data-signal inputted simultaneously using clock signal will be used to detect the phase shift between electric current I1 and voltage V1
Abnormal detection circuit 31 is set as SM set mode, and data trigger 52 transmits set output as the letter under SM set mode
Number.Only when the phase deviation of electric current I1 and voltage V1, set signal (abnormal signal) is exported from data trigger 52.Therefore,
The phase shift between electric current I1 and voltage V1 can be detected by simple circuit configuration.
Abnormal detection circuit 31 includes mask cell 57, which is fed into the electric current of the electric current I1 of load 9
Value is compared with preset a reference value, and reset signal is continuously output to data trigger 52, until electric current I1's
Value becomes higher than a reference value.Unstable in electric current I1 and electric current I1 phase power supply not consistent with each other with the phase of voltage V1
In the activation of device 1, the interim pause of phase shift detection operation of abnormal detection circuit 31, this makes it possible to prevent power supply device
1 is immediately forced stopping in power supply device 1 after having activated.
It is made of breaker 6 and control unit 8 and detects the abnormal abnormality detecting unit of rectifier 3, examined by opening the door
It surveys unit and control unit 8 constitutes and detect the abnormal abnormality detecting unit of shell 7 and by current transformer 32, transformer 33
It is constituted with the control unit 8 for including abnormal detection circuit 31 and the abnormal abnormality detecting unit for detecting inverter 5 can be only
On the spot using or be applied in combination.
This application claims the priority on September 26th, the 2017 Japanese patent application No.2017-185140 submitted, should
The full content of patent application is incorporated herein by reference.
Claims (9)
1. a kind of power supply device, comprising:
Rectifier, the rectifier are configured as the AC electrical power conversion supplied from AC power supplies being DC electric power；
Smooth unit, it is smooth which is configured as the DC electric power including ripple for making to export from the rectifier；
Inverter, the inverter are configured as that AC electric power will be converted to by the smooth DC electric power of the smooth unit；
Shell, the rectifier, the smooth unit and the inverter are contained in the shell；And
Abnormality detecting unit, the abnormality detecting unit are configured as detecting in the rectifier, the inverter and the shell
The exception of at least one,
Wherein, the smooth unit includes:
At least one capacitor, at least one capacitor are connected in parallel in the output of the rectifier；
First discharging resistor, first discharging resistor are configured as making the capacitor discharge；With
Switching device, the switching device are connected in series in first discharging resistor, and
Wherein, when the abnormality detecting unit detects abnormal, the abnormality detecting unit is closed the switching device, and
When switching device closure, the capacitor is discharged by first discharging resistor.
2. power supply device according to claim 1, wherein the smooth unit further includes the second discharging resistor, this
Two discharging resistors are connected in parallel in first discharging resistor and are configured as always making the capacitor discharge, and
Wherein, second discharging resistor has the resistance value bigger than the resistance value of first discharging resistor.
3. power supply device according to claim 1, wherein the smooth unit includes the first electricity as the capacitor
Container and the second capacitor, the first capacitor device are connected to the output of the rectifier, second capacitor by diode
Device is connected in series in the output of the rectifier, and has the capacitor bigger than the capacitor of the first capacitor device, and
Wherein, first discharging resistor is connected in parallel in the first capacitor device.
4. power supply device according to claim 3, wherein the smooth unit further includes third discharging resistor, this
Three discharging resistors are connected in parallel in second capacitor and are configured as always making second capacitor discharge, and
Wherein, the third discharging resistor has the resistance value bigger than the resistance value of first discharging resistor.
5. power supply device according to claim 1, wherein the switching device has mechanical contacts.
6. power supply device according to claim 1, wherein the switching device is semiconductor device.
7. power supply device described in any one to 6 according to claim 1, wherein the abnormality detecting unit includes open circuit
Device, the breaker are configured as cutting off the electric power to the rectifier when overcurrent flows to the rectifier from the AC power supplies
Supply, and when power supply of the circuit breaker trip to the rectifier, it is opened described in the abnormality detecting unit closure
Close device.
8. power supply device described in any one to 6 according to claim 1, wherein the abnormality detecting unit includes opening the door
Detection unit, the enabling detection unit are configured as the detection when the shell is opened and open the door, and when enabling detection is single
When member detects enabling, the abnormality detecting unit is closed the switching device.
9. power supply device described in any one to 6 according to claim 1, wherein the inverter be controlled as have with
It is connected to the corresponding output frequency of resonant frequency of the load of the power supply device, and
Wherein, the abnormality detecting unit includes phase shift detection unit, which is configured as detecting the inversion
Phase shift between the output electric current and output voltage of device, and when the phase shift detection unit detects phase shift, the exception
Detection unit is closed the switching device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-185140 | 2017-09-26 | ||
| JP2017185140A JP6340463B1 (en) | 2017-09-26 | 2017-09-26 | Power supply |
| PCT/JP2018/034913 WO2019065472A1 (en) | 2017-09-26 | 2018-09-20 | Power supply apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110521076A true CN110521076A (en) | 2019-11-29 |
| CN110521076B CN110521076B (en) | 2022-04-08 |
Family
ID=62487518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880026156.3A Active CN110521076B (en) | 2017-09-26 | 2018-09-20 | Power supply device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6340463B1 (en) |
| CN (1) | CN110521076B (en) |
| TW (1) | TWI644506B (en) |
| WO (1) | WO2019065472A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111431389A (en) * | 2020-04-15 | 2020-07-17 | 中国南方电网有限责任公司超高压输电公司广州局 | MMC power module quick discharge circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3920391A1 (en) * | 2020-06-04 | 2021-12-08 | Schaffner EMV AG | Emi filter |
| US20240162829A1 (en) * | 2021-04-01 | 2024-05-16 | Mitsubishi Electric Corporation | Power conversion device |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP6340463B1 (en) | 2018-06-06 |
| WO2019065472A1 (en) | 2019-04-04 |
| JP2019062640A (en) | 2019-04-18 |
| TWI644506B (en) | 2018-12-11 |
| TW201916569A (en) | 2019-04-16 |
| CN110521076B (en) | 2022-04-08 |
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