CN104779812B - Frequency converter and power supply unit - Google Patents
Frequency converter and power supply unit Download PDFInfo
- Publication number
- CN104779812B CN104779812B CN201410012072.8A CN201410012072A CN104779812B CN 104779812 B CN104779812 B CN 104779812B CN 201410012072 A CN201410012072 A CN 201410012072A CN 104779812 B CN104779812 B CN 104779812B
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- circuit
- power supply
- voltage
- frequency converter
- capacitor
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Classifications
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- 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
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Ac-Ac Conversion (AREA)
- Power Conversion In General (AREA)
Abstract
The present invention provides a kind of frequency converter and power supply units, the frequency converter includes the first RC circuit being made of concatenated first resistor device and first capacitor device and the switching device pair being made of concatenated two switching devices, the first end of the first RC circuit is connected to power supply, the second end of the first RC circuit is connected to the tie point between described two switching devices, it is characterized in that, the frequency converter further include: the 2nd RC circuit, including concatenated second resistor and the second capacitor, the first end of the 2nd RC circuit is connected to the power supply, the second end of the 2nd RC circuit is connected to the tie point between described two switching devices.
Description
Technical field
Present invention relates generally to frequency converters and power supply unit.
Background technique
Frequency converter is to be handed over using converter technique and microelectric technique by changing motor frequency mode of working power supply to control
The electric control appliance of galvanic electricity motivation.Frequency converter adjusts output by the on-off of built-in electrical insulation grid bipolar junction transistor (IGBT)
The voltage and/or frequency of power supply, supply voltage required for providing it according to the actual needs of motor, and then reach energy conservation,
The purpose of speed regulation.In addition, there are also many defencive functions, such as overcurrent, over-voltage, overload protection for frequency converter.Certainly with industry
The continuous improvement of dynamicization degree, frequency converter also have been widely used.
Fig. 1 diagrammatically illustrates the structural block diagram of the frequency converter of the prior art.As shown in Figure 1, frequency converter 100 includes rectification
Device 101, filter 102, switching group 103, power supply circuit 1041、1042、1043, power supply 105, by-passed resistor 1061、
1062、1063And current sampling device 107.Power supply 105 for example can be low-voltage dc power supply.Switch in switching device group
Device for example can be built-in electrical insulation grid bipolar transistor IGBT.Input L1, L2, L3 of frequency converter 100 are connected to main power source
(not shown), output UVW are connected to motor 110.The power inputted from input L1, L2, L3 is opened through over commutation, filtering and IGBT
It closes device group and is converted to the power output of required voltage and/or frequency to motor 110.Power supply circuit 1041、1042、1043With
Low-voltage dc power supply 105 provides driving voltage for the operation of IGBT switching device group.Current sampling device 107 and U phase exports
Shunt resistance 1061Parallel connection, to monitor the output electric current of frequency converter 100.For brevity, an electric current is illustrated only in Fig. 1
Sampling apparatus 107, but a current sampling device can be respectively set for the output of each phase.
Current sampling device is one of important composition component of frequency converter, for realizing the prison to output current of frequency converter
It surveys.In Small-power Inverter, the considerations of due to volume and cost, the often more cheap current sample mode of use cost,
That is the combination of by-passed resistor and linear optocoupler.To ensure current sample precision, by-passed resistor may be provided at frequency converter
UVW or UW output line on.But the power supply of the primary side of linear optocoupler usually requires the independent Switching Power Supply winding of setting,
This brings pressure to the volume and cost of frequency converter.
Summary of the invention
The present invention is proposed to solve the problems, such as in the prior art one or more.
A kind of frequency converter is provided according to an aspect of the present invention, including by concatenated first resistor device and first capacitor
The first RC circuit that device is constituted and the switching device pair that is made of concatenated two switching devices, the of the first RC circuit
One end is connected to power supply, and the second end of the first RC circuit is connected to the tie point between described two switching devices, special
Sign is, the frequency converter further include: the 2nd RC circuit, including concatenated second resistor and the second capacitor, described second
The first end of RC circuit is connected to the power supply, and the second end of the 2nd RC circuit is connected between described two switching devices
The tie point.
Optionally, the frequency converter further includes the first diode being connected in series with the first RC circuit and with described the
The second diode that two RC circuits are connected in series.
Optionally, the frequency converter further includes voltage-stablizer and photo-coupler, and the both ends of second capacitor are separately connected
To two input terminals of the voltage-stablizer.
Optionally, the frequency converter further includes the output by-passed resistor and light that are connected in parallel in the frequency converter
Coupler, the output of the voltage-stablizer are connected to the power input of the photo-coupler.
Optionally, the voltage-stablizer is linear voltage regulator, and the photo-coupler is linear optocoupler.
Optionally, the switching device is insulated gate bipolar transistor IGBT, wherein the emitter of the first IGBT connects
It is connected in series to the collector of the 2nd IGBT with being formed.
Optionally, the frequency converter further includes driving circuit, and the both ends of the first capacitor device are connected respectively to the drive
Two input terminals of dynamic circuit, the output of the driving circuit are connected to the grid of the first IGBT.
Optionally, the frequency converter includes three-phase, and each phase all respectively includes corresponding first RC circuit, switching device
To and the 2nd RC circuit.
Optionally, the power supply is low-voltage dc power supply.
A kind of power supply unit is provided according to another aspect of the present invention, is made together with the circuit having the following structure
It include the first RC circuit being made of concatenated first resistor device and first capacitor device and by concatenated two with, the circuit
The switching device pair that switching device is constituted, the first end of the first RC circuit are connected to power supply, and the of the first RC circuit
Two ends are connected to the tie point between described two switching devices, which is characterized in that the power supply unit includes: the 2nd RC electricity
Road, including concatenated second resistor and the second capacitor, the first end of the 2nd RC circuit is connected to the power supply, described
The second end of 2nd RC circuit is connected to the tie point between described two switching devices.
Optionally, which further includes the diode being connected in series with the 2nd RC circuit.
Optionally, which further includes voltage-stablizer, and the both ends of second capacitor are connected respectively to the pressure stabilizing
Two input terminals of device.
Optionally, the switching device is insulated gate bipolar transistor IGBT, wherein the emitter of the first IGBT connects
It is connected in series to the collector of the 2nd IGBT with being formed.
Optionally, the power supply is low-voltage dc power supply.
Detailed description of the invention
By reading the described in detail below of the embodiment of the present invention and the present invention will be best understood by reference to the figures,
In:
Fig. 1 diagrammatically illustrates the structural block diagram of the frequency converter of the prior art.
Fig. 2 diagrammatically illustrates the structural block diagram of frequency converter according to an embodiment of the present invention.
Fig. 3 is diagrammatically illustrated in frequency converter according to an embodiment of the present invention as the switching device of driving U phase and the electricity of U phase
Flow the schematic diagram that sampling apparatus provides the circuit of power supply.
Fig. 4 is shown when current sampling device is embodied as linear optocoupler ACPL-C790, according to embodiments of the present invention
Frequency converter the second capacitor on voltage.
Specific embodiment
Hereinafter, the preferred embodiment of the present invention is described with reference to the accompanying drawings.Through attached drawing, same reference numbers are used to indicate
Similar elements.
Fig. 2 diagrammatically illustrates the structural block diagram of frequency converter according to an embodiment of the present invention, wherein same as shown in Figure 1
Component be presented with like reference characters.As shown in Fig. 2, frequency converter 200 includes fairing 101, filter 102, opens
Close device group 103, power supply circuit 1041、1042、1043, power supply 105, by-passed resistor 1061、1062、1063, current sample dress
Set 207, supplemental powered circuit 208 and voltage-stablizer 209.
By taking three phase converter as an example, switching device group 103 may include six switching element Ts 1, T2, T3, T4, T5, T6.
Described six switching element Ts 1, T2, T3, T4, T5, T6 for example can be built-in electrical insulation grid bipolar transistor IGBT, but unlimited
In this.Six switching devices are formed as three switching devices pair corresponding with three-phase respectively, and each switching device is to packet
Include concatenated two switching devices.When switching device is embodied as IGBT, the emitter of the first IGBT is connected to the 2nd IGBT's
Collector is connected in series with being formed.
Power supply circuit 1041、1042、1043Operation with power supply 105 for switching device group 103 provides driving voltage.Power supply
105 for example can be low-voltage dc power supply, but not limited to this.
Input L1, L2, L3 of frequency converter 100 are connected to main power source (not shown).Three-phase output UVW is opened from accordingly respectively
The tie point closed between two switching devices of device centering is connected to motor 110.The power inputted from input L1, L2, L3
The power output of required voltage and/or frequency is converted to motor 110 through over commutation, filtering and IGBT switching device group.
According to an embodiment of the invention, current sampling device 207 can be implemented as linear optocoupler, but not limited to this.
The shunt resistance 106 that current sampling device 207 and U phase exports1Parallel connection, to monitor the output electric current of frequency converter 100.For simplicity
For the sake of, a current sampling device 207 is illustrated only in Fig. 2, but an electric current can be respectively set for the output of each phase and be adopted
Sampling device.Frequency converter 200 shown in Fig. 2 further includes supplemental powered circuit 208 and voltage-stablizer 209.Supplemental powered circuit can be with
Power supply circuit 1041、1042、1043It is the power supply of current sampling device 207 using identical power supply 105, and by voltage-stablizer 209.
Voltage-stablizer 209 can be implemented as linear voltage regulator, but not limited to this.
Fig. 3 is diagrammatically illustrated in frequency converter according to an embodiment of the present invention as the switching device of driving U phase and the electricity of U phase
Flow the schematic diagram that sampling apparatus provides the circuit of power supply.As shown in figure 3, the part includes by concatenated first resistor device R1 and
The first RC circuit that one capacitor C1 is constituted and the switching device pair being made of concatenated two switching element Ts 1, T2, it is described
The first end of first RC circuit is connected to power supply 105, and the second end of the first RC circuit is connected to described two switching devices
Tie point between T1, T2.The part further includes the 2nd RC circuit, including concatenated second resistor R2 and the second capacitor
C2, the first end of the 2nd RC circuit are connected to power supply 105, and the second end of the 2nd RC circuit is connected to described two open
Close the tie point between device T1, T2.Optionally, which can also include first be connected in series with the first RC circuit
Diode D1 and the second diode D2 being connected in series with the 2nd RC circuit.
During frequency converter work, switching element T 2 is first turned on, and forms charge circuit for first capacitor device C1.When
When voltage on first capacitor device C1 has reached the driving voltage of switching element T 1, switching element T 1 is connected, first capacitor device C1
Electric discharge, to form stable charge and discharge cycles.The both ends of first capacitor device C1 be connected respectively to driving circuit DRV two are defeated
Enter end, the output of driving circuit DRV is connected to the grid of switching element T 1, realizes the normal work of switching element T 1.Similarly,
Charge and discharge cycles are also formed on the second capacitor C2.Voltage on second capacitor C2 is output to after 209 pressure stabilizing of voltage-stablizer
Current sampling device 207 provides power supply for voltage sampling apparatus 207.
It, can be with although described herein is to provide power supply using the voltage on the second capacitor C2 for linear optocoupler
Understand, can use the voltage also as the other function in frequency converter and power supply is provided.In this way, can be by being multiplexed with switch
The element that device provides driving to provide power supply for other function (such as current sample).Meanwhile only needing low-voltage DC all the way
Pressure 105 can realize the power supply of the driving power supply and the other function such as current sample of switching device, simplify circuit knot
Structure reduces manufacturing cost, and reduces equipment volume.In addition, except applying in frequency converter China and foreign countries, power supply unit of the invention
It is also possible to use all similar UPS, power supply, servo-driver etc., which needs to export electric current to inverter circuit, to be detected, and right
In volume and the equipment of cost sensitivity.
Fig. 4 is shown when current sampling device 207 is embodied as linear optocoupler ACPL-C790, the second capacitor C2
On voltage.As shown, the minimum 12V of voltage on the second capacitor C2, is able to satisfy the work of linear optocoupler completely
It is required that.
It is alternatively possible to which above-mentioned first RC circuit, derailing switch is all arranged in each phase for frequency converter as illustrated in fig. 3 respectively
Part to and the 2nd RC circuit.By being multiplexed the device of three phases of frequency converter, power supply can be provided for more functions, realized into one
The cost and volume saving of step.
Although above by preferred embodiment, the present invention is described, and the invention is not limited to above-mentioned specific
Embodiment, under without departing substantially from spirit of that invention and its real situation, those skilled in the art can make respectively according to the present invention
The corresponding change and modification of kind, and these corresponding change and modification all should belong within scope of the appended claims of the present invention.
Claims (14)
1. a kind of frequency converter, including the first RC circuit being made of concatenated first resistor device and first capacitor device and by connecting
The switching device pair that constitutes of two switching devices, the first end of the first RC circuit is connected to power supply, the first RC electricity
The second end on road is connected to the tie point between described two switching devices, which is characterized in that the frequency converter further include:
2nd RC circuit, including concatenated second resistor and the second capacitor, the first end of the 2nd RC circuit are connected to
The second end of the power supply, the 2nd RC circuit is connected to the tie point between described two switching devices,
Wherein, the voltage on second capacitor is for powering.
2. frequency converter according to claim 1, which is characterized in that further include the be connected in series with the first RC circuit
One diode and the second diode being connected in series with the 2nd RC circuit.
3. frequency converter according to claim 1, which is characterized in that it further include voltage-stablizer, the both ends of second capacitor
Two input terminals of the voltage-stablizer are connected respectively to, so that the voltage on second capacitor is after the voltage-stablizer pressure stabilizing
For powering.
4. frequency converter according to claim 3, which is characterized in that further include the output parallel connection company in the frequency converter
The by-passed resistor and photo-coupler connect, the output of the voltage-stablizer are connected to the power input of the photo-coupler.
5. frequency converter according to claim 4, which is characterized in that the voltage-stablizer is linear voltage regulator, the optical coupling
Device is linear optocoupler.
6. frequency converter according to claim 1, which is characterized in that the switching device is insulated gate bipolar transistor
IGBT, wherein the emitter of the first IGBT is connected to the collector of the 2nd IGBT to be formed and be connected in series.
7. frequency converter according to claim 6, which is characterized in that it further include driving circuit, the two of the first capacitor device
End is connected respectively to two input terminals of the driving circuit, and the output of the driving circuit is connected to the grid of the first IGBT
Pole.
8. frequency converter according to claim 1, which is characterized in that the frequency converter includes three-phase, and each phase is all respectively wrapped
Include corresponding first RC circuit, switching device to and the 2nd RC circuit.
9. frequency converter according to claim 1, which is characterized in that the power supply is low-voltage dc power supply.
10. a kind of power supply unit is used together with the circuit having the following structure, the circuit includes by concatenated first resistor
The first RC circuit that device and first capacitor device are constituted and the switching device pair being made of concatenated two switching devices, described the
The first end of one RC circuit is connected to power supply, and the second end of the first RC circuit is connected between described two switching devices
Tie point, which is characterized in that the power supply unit includes:
2nd RC circuit, including concatenated second resistor and the second capacitor, the first end of the 2nd RC circuit are connected to
The second end of the power supply, the 2nd RC circuit is connected to the tie point between described two switching devices,
Wherein, the voltage on second capacitor is for powering.
11. power supply unit according to claim 10, which is characterized in that further include being connected in series with the 2nd RC circuit
Diode.
12. power supply unit according to claim 10, which is characterized in that it further include voltage-stablizer, second capacitor
Both ends are connected respectively to two input terminals of the voltage-stablizer, so that the voltage on second capacitor is steady through the voltage-stablizer
For powering after pressure.
13. power supply unit according to claim 10, which is characterized in that the switching device is insulated gate bipolar crystal
Pipe IGBT, wherein the emitter of the first IGBT is connected to the collector of the 2nd IGBT to be formed and be connected in series.
14. power supply unit according to claim 10, which is characterized in that the power supply is low-voltage dc power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410012072.8A CN104779812B (en) | 2014-01-10 | 2014-01-10 | Frequency converter and power supply unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410012072.8A CN104779812B (en) | 2014-01-10 | 2014-01-10 | Frequency converter and power supply unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104779812A CN104779812A (en) | 2015-07-15 |
| CN104779812B true CN104779812B (en) | 2019-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410012072.8A Active CN104779812B (en) | 2014-01-10 | 2014-01-10 | Frequency converter and power supply unit |
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| Country | Link |
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| CN (1) | CN104779812B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105471224B (en) * | 2015-09-15 | 2018-01-09 | 苏州格远电气有限公司 | Frequency converter control panel and power amplifier board low-voltage power supply system |
| CN110719095A (en) * | 2018-07-12 | 2020-01-21 | 浙江海利普电子科技有限公司 | Power supply circuit and method for monitoring state of load supplied by power supply circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2290149Y (en) * | 1996-05-20 | 1998-09-02 | 唐克毅 | Electronic transformer with adjustable power ad overload short-circuit protection |
| CN202150804U (en) * | 2011-09-20 | 2012-02-22 | 辽宁省电力有限公司 | AC adjustable special-purpose power supply for electric power measuring |
| CN203851039U (en) * | 2014-01-10 | 2014-09-24 | 浙江海利普电子科技有限公司 | Frequency converter and power supply device |
| US9461556B2 (en) * | 2013-10-25 | 2016-10-04 | Rhombus Energy Solutions, Inc. | Stable regenerative bi-directional cell for bridge power inverters |
-
2014
- 2014-01-10 CN CN201410012072.8A patent/CN104779812B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2290149Y (en) * | 1996-05-20 | 1998-09-02 | 唐克毅 | Electronic transformer with adjustable power ad overload short-circuit protection |
| CN202150804U (en) * | 2011-09-20 | 2012-02-22 | 辽宁省电力有限公司 | AC adjustable special-purpose power supply for electric power measuring |
| US9461556B2 (en) * | 2013-10-25 | 2016-10-04 | Rhombus Energy Solutions, Inc. | Stable regenerative bi-directional cell for bridge power inverters |
| CN203851039U (en) * | 2014-01-10 | 2014-09-24 | 浙江海利普电子科技有限公司 | Frequency converter and power supply device |
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| Publication number | Publication date |
|---|---|
| CN104779812A (en) | 2015-07-15 |
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