CN204231206U - The frequency converter of low-voltage alternating-current speed governing - Google Patents
The frequency converter of low-voltage alternating-current speed governing Download PDFInfo
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- CN204231206U CN204231206U CN201420732618.2U CN201420732618U CN204231206U CN 204231206 U CN204231206 U CN 204231206U CN 201420732618 U CN201420732618 U CN 201420732618U CN 204231206 U CN204231206 U CN 204231206U
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Abstract
The utility model relates to a kind of frequency converter of low-voltage alternating-current speed governing, comprises a drive plate, a control board, and control board connects drive plate, and drive plate connects one first rectified three-phase circuit; First rectified three-phase circuit rear is parallel with one first Absorption Capacitance, the rear of the first Absorption Capacitance is in series with a charging resistor, the rear of charging resistor is in series with a protective tube, the rear of protective tube is parallel with an electrochemical capacitor filter circuit, the rear of electrochemical capacitor filter circuit is parallel with one second Absorption Capacitance, and the rear of the second Absorption Capacitance is parallel with one second rectified three-phase circuit; Second rectified three-phase circuit is directly connected with a power output circuit, does not have electrochemical capacitor filter circuit between the second rectified three-phase circuit and power output circuit.This patent is high temperature resistant, and power factor (PF) is high.
Description
Technical field
The utility model relates to a kind of frequency converter of low-voltage alternating-current speed governing.
Background technology
Frequency converter, i.e. AC Motor's Frequency Control device are that power frequency supply (50Hz or 60Hz) is transformed to various frequency by the on-off action utilizing soft and hardware control system to control power semiconductor device, to realize the equipment that motor gear box is run.Application variable-frequency control technique can be alleviated energy shortage, reduce greenhouse gas emission, contributes to improving the quality of products, promoting industrial technological advancement.In in the past more than 20 years, along with power electronic technology, computer technology, the developing rapidly of automatic control technology, AC speed regulating replaces DC speed regulation comprehensively, becomes the main flow of electric machine speed regulation technology.Due to speed governing and a braking ability of frequency converter excellence, and high efficiency, High Power Factor and significant energy-saving effect, the frequency converter product of all size has obtained at numerous industrial circle and has generally adopted, and is acknowledged as the most rising electric machine speed regulation mode.Along with the reinforcement of people's energy-conserving and environment-protective consciousness, the application of frequency converter is day by day universal, and prospect is very wide.
Utility model content
The technical problems to be solved in the utility model is the frequency converter providing the good low-voltage alternating-current speed governing of a kind of stability of a system.
In order to solve the problems of the technologies described above, frequency converter of the present utility model can realize by the following technical solutions:
The frequency converter of low-voltage alternating-current speed governing, comprise a drive plate, a control board, control board connects drive plate, and drive plate connects one first rectified three-phase circuit, it is characterized in that, described first rectified three-phase circuit is a uncontrollable full-wave rectification bridge be made up of 6 rectifier diodes;
Described first rectified three-phase circuit rear is parallel with one first Absorption Capacitance, the rear of described first Absorption Capacitance is in series with a charging resistor, the rear of described charging resistor is in series with a protective tube, the rear of described protective tube is parallel with an electrochemical capacitor filter circuit, the rear of described electrochemical capacitor filter circuit is parallel with one second Absorption Capacitance, and the rear of described second Absorption Capacitance is parallel with one second rectified three-phase circuit;
Described second rectified three-phase circuit is a rectifier bridge be made up of six rectification modules, and described six rectification modules are formed by an insulated gate bipolar transistor and a fly-wheel diode;
Described second rectified three-phase circuit is connected with a power output circuit, is only provided with a Hall current sensor, does not have electrochemical capacitor filter circuit between described second rectified three-phase circuit and described power output circuit;
The frequency converter of low-voltage alternating-current speed governing, also comprises a shell; Described Hall current sensor connects a wireless signal transmitter, and described shell is provided with an inner fovea part, and described wireless signal transmitter embeds described inner fovea part.
This patent is on the basis reducing production cost, and also achieve high temperature resistant, volume is little, and power factor (PF) is high, and can ensure the stable beneficial effect of output voltage.In addition, the setting of charging resistor, effectively can prevent start powered on moment electric capacity shorted to earth, the voltage burning out front electric capacity two end of storage capacitor start is 0V; So be short-circuit condition over the ground at the momentary capacitance of power on (start).If do not add charging resistor between rectifier bridge and electrochemical capacitor, be then equivalent to the direct shorted to earth of 380V power supply, rectifier bridge causes rectifier bridge to explode by infinitely-great electric current instantaneously.Generally speaking the power of frequency converter is larger, and charging resistor is less.The preferred resistance range of choice of described charging resistor is the charging resistors of 10 Ω to 300 Ω.The setting of the second Absorption Capacitance effectively can absorb overcurrent and the overvoltage energy of IGBT.Described wireless signal transmitter is embedded described inner fovea part, the overall outline of the speed regulating device of the frequency converter of low-voltage alternating-current speed governing can be made even, convenient fixing on controlled device.
Described electrochemical capacitor filter circuit is made up of four electrochemical capacitors and two grading resistors.In order to or good accumulation of energy and filter action, the electrochemical capacitor of the preferred 400VDC of described electrochemical capacitor, the electrochemical capacitor capacity of described 400VDC is preferably not less than 60uf/A.Arranging of grading resistor can effectively avoid the inequality due to storage capacitor voltage to burn out the situation of storage capacitor.Because two electrochemical capacitors can not be made completely the same, the voltage that each like this electric capacity bears just may be different, bear the high heating of voltage serious (having equivalent series resistance inside electric capacity) or exceed withstand voltage and damage.
Described Hall current sensor connects in the wherein two-phase of the three-phase output end of described second rectified three-phase circuit.For detecting output current value.Described Hall current sensor selects rated current to be 1.5 to 2 of Rated motor electric current.The Hall current sensor of 5 times.
The frequency converter of low-voltage alternating-current speed governing, also comprises a drive plate, a control board; Described control board connects described drive plate, and described drive plate connects described second rectified three-phase circuit.Produce satisfactory drive singal with the pwm pulse generated by control board through drive circuit and carry out driving IGBT output voltage.
The frequency converter of low-voltage alternating-current speed governing, also comprises a low-tension supply, and described low-tension supply connects described drive plate, described control board and described two rectified three-phase circuits.To provide electric energy to each several part.Low-tension supply is a low-tension supply module that at least simultaneously can provide ± 5V voltage, ± 15V voltage and ± 24V voltage.To meet the need for electricity of each several part.
The supply line be connected with the positive pole of described low-tension supply is provided with a latching relay, described latching relay comprises moving contact and moving contact is closed to the self-locking mechanism of rear locking, also comprise one for inputting the Continuity signal leading-in end of Continuity signal, described Continuity signal leading-in end connects a button power supply by a pressure switch.To be realized the cut-out of supply line by pressure switch, realize micro-current switch and control.
Described shell is followed successively by external protection, electro-magnetic screen layer, inner insulating layer from outside to inside, and described electro-magnetic screen layer at least comprises one deck conductive mesh.To play electromagnetic shielding action, reduce electromagnetic interference, improve filtration efficiency.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, setting forth the utility model further below in conjunction with concrete diagram.
With reference to Fig. 1, the frequency converter of low-voltage alternating-current speed governing, comprising one first rectified three-phase circuit 1, first rectified three-phase circuit 1 is a uncontrollable full-wave rectification bridge be made up of 6 rectifier diodes; First rectified three-phase circuit 1 rear is parallel with one first Absorption Capacitance 2, the rear of the first Absorption Capacitance 2 is in series with a charging resistor 3, the rear of charging resistor 3 is in series with a protective tube 4, the rear of protective tube 4 is parallel with an electrochemical capacitor filter circuit 5, the rear that the rear of electrochemical capacitor filter circuit 5 is parallel with one second Absorption Capacitance 6, second Absorption Capacitance 6 is parallel with one second rectified three-phase circuit 7; Second rectified three-phase circuit 7 is the rectifier bridges be made up of six rectification modules, and six rectification modules are formed by an insulated gate bipolar transistor and a fly-wheel diode; Second rectified three-phase circuit 7 is directly connected with a power output circuit, does not have electrochemical capacitor filter circuit 5 between the second rectified three-phase circuit 7 and power output circuit.
This patent is on the basis reducing production cost, and also achieve high temperature resistant, volume is little, and power factor (PF) is high, and can ensure the stable beneficial effect of output voltage.In addition, the setting of charging resistor 3, effectively can prevent start powered on moment electric capacity shorted to earth, the voltage burning out front electric capacity two end of storage capacitor start is 0V; So be short-circuit condition over the ground at the momentary capacitance of power on (start).If do not add charging resistor 3 between rectifier bridge and electrochemical capacitor, be then equivalent to the direct shorted to earth of 380V power supply, rectifier bridge causes rectifier bridge to explode by infinitely-great electric current instantaneously.Generally speaking the power of frequency converter is larger, and charging resistor 3 is less.Charging resistor 3 preferably resistance range of choice is the charging resistors of 10 Ω to 300 Ω.The setting of the second Absorption Capacitance 6 effectively can absorb overcurrent and the overvoltage energy of IGBT.
The frequency converter of low-voltage alternating-current speed governing, also comprises drive plate 9, control board 10; Control board 10 connects drive plate 9, and drive plate 9 connects the second rectified three-phase circuit 7.Produce satisfactory drive singal with the pwm pulse generated by control board 10 through drive circuit and carry out driving IGBT output voltage.
Electrochemical capacitor filter circuit 5 is made up of four electrochemical capacitors and two grading resistors.In order to or good accumulation of energy and filter action, the electrochemical capacitor of the preferred 400VDC of electrochemical capacitor, the electrochemical capacitor capacity of 400VDC is preferably not less than 60uf/A.Arranging of grading resistor can effectively avoid the inequality due to storage capacitor voltage to burn out the situation of storage capacitor.Because two electrochemical capacitors can not be made completely the same, the voltage that each like this electric capacity bears just may be different, bear the high heating of voltage serious (having equivalent series resistance inside electric capacity) or exceed withstand voltage and damage.
A Hall current sensor 8 is only provided with between second rectified three-phase circuit 7 and power output circuit.Hall current sensor 8 connects in the wherein two-phase of the three-phase output end of the second rectified three-phase circuit 7.For detecting output current value.Hall current sensor 8 selects rated current to be 1.5 to 2 of Rated motor electric current.The Hall current sensor 8 of 5 times.
The frequency converter of low-voltage alternating-current speed governing, also comprises a low-tension supply 11, and low-tension supply 11 connects drive plate 9, control board 10 and two rectified three-phase circuits.To provide electric energy to each several part.Low-tension supply 11 is the low-tension supply modules can provide ± 5V voltage, ± 15V voltage and ± 24V voltage simultaneously.To meet the need for electricity of each several part.
The frequency converter of low-voltage alternating-current speed governing, also comprises a shell, and shell is followed successively by external protection, electro-magnetic screen layer, inner insulating layer from outside to inside, and electro-magnetic screen layer at least comprises one deck conductive mesh.To play electromagnetic shielding action, reduce electromagnetic interference, improve filtration efficiency.
Hall current sensor 8 connects a wireless signal transmitter, and wireless signal transmitter is positioned at outside shell.Externally to be transmitted by wireless signal transmitter, person easy to use understands current conditions in time, thus carries out the manual intervention of speed regulating control.Hall current sensor 8 connects a wireless signal transmitter, and wireless signal transmitter is positioned at outside shell.Externally to be transmitted by wireless signal transmitter, person easy to use understands current conditions in time, thus carries out the manual intervention of speed regulating control.Preferred shell is provided with an inner fovea part, and wireless signal transmitter embeds inner fovea part.To make the overall outline of the speed regulating device of the frequency converter of low-voltage alternating-current speed governing even, convenient fixing on controlled device.
The frequency converter of low-voltage alternating-current speed governing, also comprise a low-tension supply, low-tension supply connection control plate, the supply line be connected with the positive pole of low-tension supply is provided with a latching relay, latching relay comprises moving contact and moving contact is closed to the self-locking mechanism of rear locking, also comprise one for inputting the Continuity signal leading-in end of Continuity signal, Continuity signal leading-in end connects a button power supply by a pressure switch.To be realized the cut-out of supply line by pressure switch, realize micro-current switch and control.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. the frequency converter of low-voltage alternating-current speed governing, comprise a drive plate, a control board, control board connects drive plate, and drive plate connects one first rectified three-phase circuit, it is characterized in that, described first rectified three-phase circuit is a uncontrollable full-wave rectification bridge be made up of 6 rectifier diodes;
Described first rectified three-phase circuit rear is parallel with one first Absorption Capacitance, the rear of described first Absorption Capacitance is in series with a charging resistor, the rear of described charging resistor is in series with a protective tube, the rear of described protective tube is parallel with an electrochemical capacitor filter circuit, the rear of described electrochemical capacitor filter circuit is parallel with one second Absorption Capacitance, and the rear of described second Absorption Capacitance is parallel with one second rectified three-phase circuit;
Described second rectified three-phase circuit is a rectifier bridge be made up of six rectification modules, and described six rectification modules are formed by an insulated gate bipolar transistor and a fly-wheel diode;
Described second rectified three-phase circuit is connected with a power output circuit, is only provided with a Hall current sensor, does not have electrochemical capacitor filter circuit between described second rectified three-phase circuit and described power output circuit;
The frequency converter of low-voltage alternating-current speed governing, also comprises a shell; Described Hall current sensor connects a wireless signal transmitter, and described shell is provided with an inner fovea part, and described wireless signal transmitter embeds described inner fovea part.
2. the frequency converter of low-voltage alternating-current speed governing according to claim 1, is characterized in that, described charging resistor is a resistance range of choice is the charging resistors of 10 Ω to 300 Ω.
3. the frequency converter of low-voltage alternating-current speed governing according to claim 1, is characterized in that, described electrochemical capacitor filter circuit is made up of four electrochemical capacitors and two grading resistors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420732618.2U CN204231206U (en) | 2014-11-27 | 2014-11-27 | The frequency converter of low-voltage alternating-current speed governing |
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| CN201420732618.2U CN204231206U (en) | 2014-11-27 | 2014-11-27 | The frequency converter of low-voltage alternating-current speed governing |
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| CN204231206U true CN204231206U (en) | 2015-03-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579112A (en) * | 2015-01-25 | 2015-04-29 | 襄阳绿控电气科技有限公司 | Auxiliary power controller used for electric automobile |
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2014
- 2014-11-27 CN CN201420732618.2U patent/CN204231206U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104579112A (en) * | 2015-01-25 | 2015-04-29 | 襄阳绿控电气科技有限公司 | Auxiliary power controller used for electric automobile |
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