CN203851039U - Frequency converter and power supply device - Google Patents
Frequency converter and power supply device Download PDFInfo
- Publication number
- CN203851039U CN203851039U CN201420016110.2U CN201420016110U CN203851039U CN 203851039 U CN203851039 U CN 203851039U CN 201420016110 U CN201420016110 U CN 201420016110U CN 203851039 U CN203851039 U CN 203851039U
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- Prior art keywords
- circuit
- frequency converter
- power supply
- capacitor
- igbt
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Abstract
The utility model provides a frequency converter and a power supply device. The frequency converter comprises a first RC circuit composed of a first resistor and a first capacitor which are connected in series, and a switching device pair composed of two switching devices which are connected in series. A first end of the first RC circuit is connected to a power supply, and a second end of the first RC circuit is connected to a connection point between the two switching devices. The frequency converter is characterized by further comprising a second RC circuit composed of a second resistor and a second capacitor which are connected in series, wherein a first end of the second RC circuit is connected to the power supply, and a second end of the second RC circuit is connected to the connection point between the two switching devices.
Description
Technical field
The utility model generally relates to frequency converter and electric supply installation.
Background technology
Frequency converter is application converter technique and microelectric technique, controls the electric control appliance of alternating current motor by changing machine operation supply frequency mode.Frequency converter is adjusted voltage and/or the frequency of out-put supply by the break-make of built-in electrical insulation grid bipolar transistor (IGBT), according to the actual needs of motor, provide its needed supply voltage, and then reaches the objects such as energy-conservation, speed governing.In addition, frequency converter also has a lot of defencive functions, as overcurrent, overvoltage, overload protection etc.Along with improving constantly of industrial automatization, frequency converter has also obtained application very widely.
Fig. 1 has schematically shown the structured flowchart of the frequency converter of prior art.As shown in Figure 1, frequency converter 100 comprises rectifying device 101, filter 102, switches set 103, power supply circuits 104
1, 104
2, 104
3, power supply 105, by-passed resistor 106
1, 106
2, 106
3, and current sampling device 107.Power supply 105 can be for example low-voltage dc power supply.Switching device in switching device group can be for example built-in electrical insulation grid bipolar transistor IGBT.Input L1, the L2 of frequency converter 100, L3 are connected to main power source (not shown), and output UVW is connected to motor 110.The power stage that the power of inputting from input L1, L2, L3 is converted to required voltage and/or frequency through over commutation, filtering and IGBT switching device group is to motor 110.Power supply circuits 104
1, 104
2, 104
3the operation that is IGBT switching device group with low-voltage dc power supply 105 provides driving voltage.The shunt resistance 106 that current sampling device 107 and U export mutually
1parallel connection, to monitor the output current of frequency converter 100.For brevity, in Fig. 1, only show a current sampling device 107, but can export mutually a current sampling device is set respectively for each.
Current sampling device is one of important composition parts of frequency converter, for realizing the monitoring to frequency converter output current.In Small-power Inverter, due to the consideration of volume and cost, the current sample mode that often use cost is comparatively cheap, the i.e. combination of by-passed resistor and linear optocoupler.For guaranteeing current sample precision, by-passed resistor can be arranged on the UVW or UW output line of frequency converter.But the former limit power supply of linear optocoupler need to arrange independently Switching Power Supply winding conventionally, this has brought pressure to volume and the cost of frequency converter.
Utility model content
For solving one or more problem of the prior art, the utility model is proposed.
According to an aspect of the present utility model, provide a kind of frequency converter, comprise the RC circuit that formed by first resistor of connecting and the first capacitor and by two switching devices pair that switching device forms of connecting, the first end of a described RC circuit is connected to power supply, the second end of a described RC circuit is connected to the tie point between described two switching devices, it is characterized in that, described frequency converter also comprises: the 2nd RC circuit, the second resistor and the second capacitor that comprise series connection, the first end of described the 2nd RC circuit is connected to described power supply, the second end of described the 2nd RC circuit is connected to the described tie point between described two switching devices.
Alternatively, described frequency converter also comprises the first diode being connected in series with a described RC circuit and the second diode being connected in series with described the 2nd RC circuit.
Alternatively, described frequency converter also comprises pressurizer and optical coupler, and the two ends of described the second capacitor are connected respectively to two inputs of described pressurizer.
Alternatively, described frequency converter is also included in by-passed resistor and the optical coupler that the output of described frequency converter is connected in parallel, and the output of described pressurizer is connected to the power input of described optical coupler.
Alternatively, described pressurizer is linear voltage regulator, and described optical coupler is linear optocoupler.
Alternatively, described switching device is insulated gate bipolar transistor IGBT, and the collector electrode that wherein emitter of an IGBT is connected to the 2nd IGBT is connected in series to form.
Alternatively, described frequency converter also comprises drive circuit, and the two ends of described the first capacitor are connected respectively to two inputs of described drive circuit, and the output of described drive circuit is connected to the grid of a described IGBT.
Alternatively, described frequency converter comprises three-phase, each all comprise separately mutually a corresponding RC circuit, switching device to and the 2nd RC circuit.
Alternatively, described power supply is low-voltage dc power supply.
According to another aspect of the present utility model, provide a kind of electric supply installation, use together with thering is the circuit of following structure, described circuit comprises the RC circuit that consists of first resistor of connecting and the first capacitor and by two switching devices pair that switching device forms of connecting, the first end of a described RC circuit is connected to power supply, the second end of a described RC circuit is connected to the tie point between described two switching devices, it is characterized in that, described electric supply installation comprises: the 2nd RC circuit, the second resistor and the second capacitor that comprise series connection, the first end of described the 2nd RC circuit is connected to described power supply, the second end of described the 2nd RC circuit is connected to the described tie point between described two switching devices.
Alternatively, this electric supply installation also comprises the diode being connected in series with described the 2nd RC circuit.
Alternatively, this electric supply installation also comprises pressurizer, and the two ends of described the second capacitor are connected respectively to two inputs of described pressurizer.
Alternatively, described switching device is insulated gate bipolar transistor IGBT, and the collector electrode that wherein emitter of an IGBT is connected to the 2nd IGBT is connected in series to form.
Alternatively, described power supply is low-voltage dc power supply.
Accompanying drawing explanation
By reading the following detailed description of the utility model embodiment and will understanding better the utility model with reference to accompanying drawing, wherein:
Fig. 1 has schematically shown the structured flowchart of the frequency converter of prior art.
Fig. 2 has schematically shown according to the structured flowchart of the frequency converter of the utility model embodiment.
Fig. 3 schematically shown according in the frequency converter of the utility model embodiment for driving the switching device of U phase and the current sampling device of U phase that the schematic diagram of the circuit of power supply is provided.
Fig. 4 shows when current sampling device is embodied as linear optocoupler ACPL-C790, according to the voltage on the second capacitor of the frequency converter of the utility model embodiment.
Embodiment
Hereinafter, preferred embodiment of the present utility model is described with reference to the accompanying drawings.Run through accompanying drawing, same reference numbers is used to indicate similar elements.
Fig. 2 has schematically shown according to the structured flowchart of the frequency converter of the utility model embodiment, and wherein, parts same as shown in Figure 1 represent with identical Reference numeral.As shown in Figure 2, frequency converter 200 comprises rectifying device 101, filter 102, switching device group 103, power supply circuits 104
1, 104
2, 104
3, power supply 105, by-passed resistor 106
1, 106
2, 106
3, current sampling device 207, supplemental powered circuit 208 and pressurizer 209.
Take three phase converter as example, and switching device group 103 can comprise six switching element T 1, T2, T3, T4, T5, T6.Described six switching element T 1, T2, T3, T4, T5, T6 can be for example built-in electrical insulation grid bipolar transistor IGBTs, but be not limited to this.Described six switching devices form three corresponding with three-phase respectively switching devices pair, and each switching device is to comprising two switching devices of series connection.When switching device is embodied as IGBT, the collector electrode that the emitter of an IGBT is connected to the 2nd IGBT is connected in series to form.
Power supply circuits 104
1, 104
2, 104
3the operation that is switching device group 103 with power supply 105 provides driving voltage.Power supply 105 can be for example low-voltage dc power supply, but is not limited to this.
Input L1, the L2 of frequency converter 100, L3 are connected to main power source (not shown).Three-phase output UVW is connected to motor 110 from the tie point between two switching devices of corresponding switching device centering respectively.The power stage that the power of inputting from input L1, L2, L3 is converted to required voltage and/or frequency through over commutation, filtering and IGBT switching device group is to motor 110.
According to embodiment of the present utility model, current sampling device 207 can be implemented as linear optocoupler, but is not limited to this.The shunt resistance 106 that current sampling device 207 and U export mutually
1parallel connection, to monitor the output current of frequency converter 100.For brevity, in Fig. 2, only show a current sampling device 207, but can export mutually a current sampling device is set respectively for each.Frequency converter 200 shown in Fig. 2 also comprises supplemental powered circuit 208 and pressurizer 209.Supplemental powered circuit can with power supply circuits 104
1, 104
2, 104
3use identical power supply 105, and be current sampling device 207 power supplies by pressurizer 209.Pressurizer 209 can be implemented as linear voltage regulator, but is not limited to this.
Fig. 3 schematically shown according in the frequency converter of the utility model embodiment for driving the switching device of U phase and the current sampling device of U phase that the schematic diagram of the circuit of power supply is provided.As shown in Figure 3, this part comprises the RC circuit that consists of the first resistor R1 connecting and the first capacitor C1 and by two switching devices pair that switching element T 1, T2 form of connecting, the first end of a described RC circuit is connected to power supply 105, and the second end of a described RC circuit is connected to the tie point between described two switching element T 1, T2.This part also comprises the 2nd RC circuit, the the second resistor R2 and the second capacitor C2 that comprise series connection, the first end of described the 2nd RC circuit is connected to power supply 105, and the second end of described the 2nd RC circuit is connected to the described tie point between described two switching element T 1, T2.Alternatively, this part can also comprise the first diode D1 being connected in series with a RC circuit and the second diode D2 being connected in series with the 2nd RC circuit.
At frequency converter duration of work, first conducting of switching element T 2, has formed charge circuit for the first capacitor C1.When the voltage on the first capacitor C1 has reached the driving voltage of switching element T 1, switching element T 1 conducting, the first capacitor C1 electric discharge, thus form stable charge and discharge cycles.The two ends of the first capacitor C1 are connected respectively to two inputs of drive circuit DRV, and the output of drive circuit DRV is connected to the grid of switching element T 1, realize the normal work of switching element T 1.Similarly, on the second capacitor C2, also form charge and discharge cycles.Voltage on the second capacitor C2 outputs to current sampling device 207 after pressurizer 209 voltage stabilizings, for voltage sampling apparatus 207 provides power supply.
Although described herein, be to utilize voltage on the second capacitor C2 for linear optocoupler provides power supply, be understandable that, also can utilize this voltage to provide power supply for other functions in frequency converter.Like this, can for example, provide power supply for other functions (current sample) by being multiplexed with element that switching device provides driving.Meanwhile, Zhi Xu mono-road low-voltage dc voltage 105 just can be realized the driving power supply of switching device and such as the power supply of other functions such as current sample, simplify circuit structure, has reduced manufacturing cost, and has reduced equipment volume.In addition, except being applied in frequency converter China and foreign countries, electric supply installation of the present utility model also may be used all similar UPS, power supply, and servo-drivers etc. need to detect inverter circuit output current, and in the equipment of volume and cost sensitivity.
Fig. 4 shows when current sampling device 207 is embodied as linear optocoupler ACPL-C790, the voltage on the second capacitor C2.As shown in the figure, voltage on the second capacitor C2 is minimum is 12V, can meet the job requirement of linear optocoupler completely.
Alternatively, can for each of frequency converter all arrange as illustrated in fig. 3 respectively mutually an above-mentioned RC circuit, switching device to the 2nd RC circuit.The device of three phases by multiplexing frequency converter, can provide power supply for greater functionality, realizes further cost and volume saving.
Although above, by preferred embodiment, the utility model is illustrated; but the utility model is not limited to above-mentioned specific embodiment; do not deviating under the utility model spirit and real situation thereof; skilled personnel can make various corresponding changes and distortion according to the utility model, and these corresponding changes and distortion all should belong to the utility model claims protection range within.
Claims (14)
1. a frequency converter, comprise the RC circuit that formed by first resistor of connecting and the first capacitor and by two switching devices pair that switching device forms of connecting, the first end of a described RC circuit is connected to power supply, the second end of a described RC circuit is connected to the tie point between described two switching devices, it is characterized in that, described frequency converter also comprises:
The 2nd RC circuit, comprises the second resistor and second capacitor of series connection, and the first end of described the 2nd RC circuit is connected to described power supply, and the second end of described the 2nd RC circuit is connected to the described tie point between described two switching devices.
2. frequency converter according to claim 1, is characterized in that, also comprises the first diode being connected in series with a described RC circuit and the second diode being connected in series with described the 2nd RC circuit.
3. frequency converter according to claim 1, is characterized in that, also comprises pressurizer, and the two ends of described the second capacitor are connected respectively to two inputs of described pressurizer.
4. frequency converter according to claim 3, is characterized in that, is also included in by-passed resistor and optical coupler that the output of described frequency converter is connected in parallel, and the output of described pressurizer is connected to the power input of described optical coupler.
5. frequency converter according to claim 4, is characterized in that, described pressurizer is linear voltage regulator, and described optical coupler is linear optocoupler.
6. frequency converter according to claim 1, is characterized in that, described switching device is insulated gate bipolar transistor IGBT, and the collector electrode that wherein emitter of an IGBT is connected to the 2nd IGBT is connected in series to form.
7. frequency converter according to claim 6, is characterized in that, also comprises drive circuit, and the two ends of described the first capacitor are connected respectively to two inputs of described drive circuit, and the output of described drive circuit is connected to the grid of a described IGBT.
8. frequency converter according to claim 1, is characterized in that, described frequency converter comprises three-phase, each all comprise separately mutually a corresponding RC circuit, switching device to and the 2nd RC circuit.
9. frequency converter according to claim 1, is characterized in that, described power supply is low-voltage dc power supply.
10. an electric supply installation, use together with thering is the circuit of following structure, described circuit comprises the RC circuit that consists of first resistor of connecting and the first capacitor and by two switching devices pair that switching device forms of connecting, the first end of a described RC circuit is connected to power supply, the second end of a described RC circuit is connected to the tie point between described two switching devices, it is characterized in that, described electric supply installation comprises:
The 2nd RC circuit, comprises the second resistor and second capacitor of series connection, and the first end of described the 2nd RC circuit is connected to described power supply, and the second end of described the 2nd RC circuit is connected to the described tie point between described two switching devices.
11. electric supply installations according to claim 10, is characterized in that, also comprise the diode being connected in series with described the 2nd RC circuit.
12. electric supply installations according to claim 10, is characterized in that, also comprise pressurizer, and the two ends of described the second capacitor are connected respectively to two inputs of described pressurizer.
13. electric supply installations according to claim 10, is characterized in that, described switching device is insulated gate bipolar transistor IGBT, and the collector electrode that wherein emitter of an IGBT is connected to the 2nd IGBT is connected in series to form.
14. electric supply installations according to claim 10, is characterized in that, described power supply is low-voltage dc power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420016110.2U CN203851039U (en) | 2014-01-10 | 2014-01-10 | Frequency converter and power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420016110.2U CN203851039U (en) | 2014-01-10 | 2014-01-10 | Frequency converter and power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203851039U true CN203851039U (en) | 2014-09-24 |
Family
ID=51564007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420016110.2U Withdrawn - After Issue CN203851039U (en) | 2014-01-10 | 2014-01-10 | Frequency converter and power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203851039U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779812A (en) * | 2014-01-10 | 2015-07-15 | 浙江海利普电子科技有限公司 | Frequency converter and power supply device |
-
2014
- 2014-01-10 CN CN201420016110.2U patent/CN203851039U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779812A (en) * | 2014-01-10 | 2015-07-15 | 浙江海利普电子科技有限公司 | Frequency converter and power supply device |
| CN104779812B (en) * | 2014-01-10 | 2019-06-04 | 浙江海利普电子科技有限公司 | Frequency converter and power supply unit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140924 Effective date of abandoning: 20190604 |
|
| AV01 | Patent right actively abandoned |