CN209627245U - A kind of switching power supply of frequency converter circuit - Google Patents
A kind of switching power supply of frequency converter circuit Download PDFInfo
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- CN209627245U CN209627245U CN201920615011.9U CN201920615011U CN209627245U CN 209627245 U CN209627245 U CN 209627245U CN 201920615011 U CN201920615011 U CN 201920615011U CN 209627245 U CN209627245 U CN 209627245U
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Abstract
The utility model relates to converter technology fields, disclose a kind of higher switching power supply of frequency converter circuit of security performance, one end of first resistor and the output loop of IGBT connect, for detecting the current signal of IGBT output；The other end of first resistor is coupled to the sampled signal input terminal of integrated circuit, and by current signal input ic, is compared with the reference signal in integrated circuit；The connection of the positive voltage output end of one end of first capacitor and one end of second resistance and IGBT, the other end of first capacitor and the connection of the other end of second resistance and the cathode of first diode, the anode of first diode is coupled to the drain electrode of field-effect tube, and the grid of field-effect tube is coupled to the signal output end of integrated circuit；If current signal is greater than reference signal, integrated circuit exports low level signal to field-effect tube, and low level signal is for closing field-effect tube, so that the output loop open circuit of IGBT.
Description
Technical field
The utility model relates to converter technology fields, more specifically to a kind of switching power supply of frequency converter circuit.
Background technique
Frequency converter (Variable-frequency Drive, VFD) is using converter technique and microelectric technique, by changing
The mode of power transformation machine working power frequency controls the electric control appliance of ac motor.Frequency converter relies on internal IGBT
The conduction and cut-off of (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) module is defeated to adjust
The voltage and frequency of power supply, supply voltage required for providing it according to the actual needs of motor out, and then reach energy conservation, adjust
The purpose of speed.With the continuous improvement of industrial automatization, frequency converter is widely used.Therefore, change how is ensured
The operational safety of frequency device is a major issue in need of consideration.
Utility model content
The technical problem to be solved by the present invention is to provide a kind of higher switching power supply of frequency converter electricity of security performance
Road.
The technical scheme adopted by the utility model to solve the technical problem is as follows: constructing a kind of switching power supply of frequency converter electricity
Road, including first resistor, first capacitor, second resistance, first diode, field-effect tube and integrated circuit, the first resistor
One end and the output loop of IGBT connect, for detecting the current signal of IGBT output,
The other end of the first resistor is coupled to the sampled signal input terminal of the integrated circuit, and the electric current is believed
Number input ic, is compared with the reference signal in the integrated circuit,
One end of the first capacitor and one end of the second resistance are connect with the positive voltage output end of the IGBT, institute
The other end of the other end and the second resistance of stating first capacitor is connect with the cathode of the first diode, and the described 1st
The anode of pole pipe is coupled to the drain electrode of the field-effect tube, and the grid of the field-effect tube is coupled to the signal of the integrated circuit
Output end,
If the current signal is greater than the reference signal, the integrated circuit exports low level to the field-effect tube
Signal, the low level signal is for closing the field-effect tube, so that the output loop open circuit of the IGBT.
It optionally, further include transformer and the second diode, the transformer has the first winding and the second winding, described
One end of first winding is connect jointly with one end of the first capacitor and one end of the second resistance, first winding
The other end is coupled to the anode of the first diode,
One end of second winding is coupled to the anode of second diode, the other end of second winding and institute
State one end connection of first resistor.
It optionally, further include the second capacitor and 3rd resistor, the negative voltage of the cathode and the IGBT of second capacitor
The anode of output end connection, second capacitor is connect with one end of the 3rd resistor, the other end coupling of the 3rd resistor
It is connected to the positive voltage output end of the IGBT.
It optionally, further include third diode and photoelectrical coupler, the cathode of the third diode and the photoelectricity coupling
The signal input part of clutch connects, and the reference signal end of the signal output end of the photoelectrical coupler and the integrated circuit connects
It connects.
It optionally, further include the 4th resistance and third capacitor, one end of the 4th resistance and the base of the integrated circuit
Quasi- voltage output end connection, the other end of the 4th resistance are coupled to the anode of the third capacitor, the third capacitor
Cathode is connect with the common end of the integrated circuit.
It mainly include first resistor, effect pipe and integrated in switching power supply of frequency converter circuit described in the utility model
Circuit.One end of first resistor and the sampled signal input terminal of integrated circuit connect, and the signal output end of integrated circuit and field are imitated
Should pipe grid connection, pass through level signal control field-effect tube conduction and cut-off.Wherein, first resistor is for detecting IGBT
The current signal of output, and by the sampled signal input terminal of current signal input ic, believe with the benchmark in integrated circuit
It number is compared, if current signal is greater than reference signal, integrated circuit exports low level signal, low level letter to field-effect tube
Number for closing the output loop of field-effect tube, so that the output loop open circuit of IGBT, IGBT is protected not overloaded or overcurrent
It influences, and then extends the service life of IGBT.Compared with prior art, the switching power supply of frequency converter circuit of the utility model is in electricity
When road occurs abnormal, the output loop of IGBT can be disconnected in time, safety is higher.
Detailed description of the invention
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing:
Fig. 1 is the partial circuit diagram of switching power supply of frequency converter circuit.
Specific embodiment
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
Fig. 1 is the partial circuit diagram of switching power supply of frequency converter circuit.As shown in Figure 1, switching power supply of frequency converter circuit is main
Including first resistor R1, first capacitor C1, the second capacitor C2, second resistance R2, transformer Tr1, first diode D1, the two or two
Pole pipe D2, field-effect tube Q1, integrated circuit U1 and photoelectrical coupler U2.Specifically, first resistor R1 is for detecting IGBT output
Voltage signal, and voltage signal is converted into current signal.Integrated circuit U1 has monitoring, operation and driving MOSFET power
The effect of pipe has eight pins, specifically: Vcc corresponding voltage signal input part；Vref corresponds to reference signal end；Rt pairs
Answer reset terminal；GND corresponding circuits common end；Out corresponds to signal output end；Ifb corresponding sample signal input part；Comp is corresponding to be mended
Repay input terminal；Vfb corresponding voltage feedback input end.Further, the output loop of one end of first resistor R1 and IGBT connect,
For detecting the current signal of IGBT output, the other end of first resistor R1 is coupled to the sampled signal input of integrated circuit U1
End, and the current signal input ic U1 that will test, are compared with the reference signal set in integrated circuit U1.
The signal output end of integrated circuit U1 is connect with the grid of field-effect tube Q1, and driving signal is inputted field-effect tube
Q1 is used for driving FET Q1.Specifically, field-effect tube Q1 be the enhanced metal-oxide-semiconductor of N-channel type, have amplification, constant-current source and
The effect of electronic switch.The source electrode of field-effect tube Q1 is connect with the sampled signal input terminal of integrated circuit U1, field-effect tube Q1's
It drains and is connect with the anode of first diode D1.
First diode D1 has the function of rectification.Specifically, the cathode of first diode D1 and the one of first capacitor C1
End and the one end second resistance R2 connect jointly, the other end and the second resistance R2 other end connection of first capacitor C1, first capacitor
The parallel circuit of C1 and second resistance R2 is connected on the output loop of IGBT.
Further, switching circuit further includes transformer Tr1, has four groups of windings, respectively the first winding N1, second
Winding N2, tertiary winding N3 and the 4th winding N4.Wherein, one end of the first winding N1 is connect with the anode of first diode D1,
The other end of first winding N1 is connect with the output loop of one end of first capacitor C1, one end of second resistance R2 and IGBT.
The first winding of one group of current signal input transformer Tr1 after first capacitor C1 and second resistance R2 of IGBT
N1, then exported from the 4th winding N4 of transformer Tr1 to load, drive loaded work piece.
Another group of current signal (that is: sampled signal) of IGBT is through first resistor R1 input ic U1, with integrated electricity
The reference signal of road U1 setting is compared, and is negative if current signal (sampled signal) value of input is greater than reference signal
It carries lateral circuit and the case where overcurrent or overload occurs.At this point, integrated circuit U1 imitates field to field-effect tube Q1 input low level signal
Should pipe Q1 become ending from being connected, and then close field-effect tube Q1 so that the output loop of IGBT is in off state, Neng Gouyou
Effect ground protects IGBT not influenced or breakdown by instantaneous peak current, extends the service life of frequency converter.
In the present embodiment, in order to improve the stability of switching power circuit, the second capacitor, can be set in circuit
Three resistance and the second diode.Specifically, the second capacitor C2 has the function of filtering, and 3rd resistor R3 is for providing starting electricity
Stream, the second diode D2 have the function of rectification
The anode of second capacitor C2 is connect jointly with the cathode of one end of 3rd resistor R3 and the second diode D2, the second electricity
The cathode for holding C2 is coupled to the negative voltage side (N-terminal in circuit) of IGBT, and the other end of 3rd resistor R3 is coupled to the positive electricity of IGBT
The anode of pressure side (end P in circuit), the second diode D2 is connect with one end of the second winding N2 of transformer Tr1,3rd resistor
One end of R3 is connect with the voltage signal inputs of integrated circuit U1, provides driving current for integrated circuit U1, triggers integrated electricity
Road U1.
In the present embodiment, for the frequency of oscillation of stabilizing circuit, the 4th resistance and third electricity can be set in circuit
Hold.Specifically, one end of the 4th resistance R4 is connect with the reference signal end of integrated circuit U1, the other end and collection of the 4th resistance R4
At the reset terminal of circuit U 1 and the common connection of the anode of third capacitor C3, the reset of the cathode and integrated circuit U1 of third capacitor C3
End and common end connect jointly, and the 4th resistance R4, third capacitor C3 and integrated circuit U1 constitute a part of oscillation circuit.
In the present embodiment, in order to reduce influence of the external signal to integrated circuit, the 5th electricity can be set in circuit
Resistance and the 4th capacitor.Specifically, the 5th resistance R5 and the 4th capacitor C4 are connected in parallel, and the 4th capacitor C4 is for filtering.5th electricity
One end and one end of the 4th capacitor C4 of resistance R5 and the compensation input terminal of integrated circuit U1 are connect jointly, and the 5th resistance R5's is another
End and the other end of the 4th capacitor C4 and the Voltage Feedback input terminal of integrated circuit U1 are connect jointly, to improve the feedback letter of input
Number quality.
In the present embodiment, in order to guarantee the reliability of voltage regulator circuit, photoelectrical coupler, third can be set in circuit
Diode, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor and the 6th capacitor.Specifically
Ground, photoelectrical coupler U2 are used for optical signal one-way transmission, in output signal end to input terminal without feedback, can effectively block circuit or
Electrical communication and isolation performance between system is good, and electric isolution is fully achieved between input terminal and output end, stable and reliable in work.The
Three diode D3 have the function of rectification.The anode of third diode D3 is connect with one end of the tertiary winding N3 of transformer Tr1,
The cathode of third diode D3 is coupled to the signal input part of photoelectrical coupler U2 (i.e.；The anode of light emitting diode), photoelectricity coupling
The signal output end of clutch U2 is connect with the reference signal end of integrated circuit U1, another signal output end of photoelectrical coupler U2 with
One end of 6th resistance R6 connects, and the other end of the 6th resistance R6 is coupled to the Voltage Feedback input terminal of integrated circuit U1, wherein
The voltage value of voltage regulator circuit output is+5V voltage.Photoelectrical coupler U2 feeds back to the output voltage sampling of voltage regulator circuit integrated
It in circuit U 1, is compared with the reference voltage in integrated circuit U1, whether the voltage value for monitoring output is normal.
Further, one end of the 7th resistance R7 is connect with the Voltage Feedback input terminal of integrated circuit U1, the 7th resistance R7
The other end connect with external circuit.Wherein, the cathode and the 6th capacitor C6 of one end of the 8th resistance R8 and third diode D3
Anode connection, the signal input part of the other end of the 8th resistance R8 and photoelectrical coupler U2 are (i.e.；The anode of light emitting diode)
Connection, the voltage signal that the 8th resistance R8 will test voltage regulator circuit output feed back to integrated circuit U1.
The other end of the tertiary winding N3 of the cathode and transformer Tr1 of 6th capacitor C6 is connect.One end of 9th resistance R9
(i.e. with the signal output end of photoelectrical coupler U2；The cathode of light emitting diode) connection, the other end and the 8th of the 9th resistance R9
One end of resistance R8 and one end of the tenth resistance R10 connect jointly, and the other end of the tenth resistance R10 is coupled to eleventh resistor
One end of R11, collectively forms voltage regulator circuit.Wherein, reversed two pole is provided between the 9th resistance R9 and eleventh resistor R11
Pipe D4.
In the present embodiment, for proof load reliability of operation, the 5th capacitor can be set in circuit.Wherein,
5th capacitor C5 has the function of filtering and absorbing wave crest.Specifically, the anode of the 5th capacitor C5 with the 4th of transformer Tr1 around
One end connection of group N4, the cathode of the 5th capacitor C5 are coupled to the other end of the 4th winding N4 of transformer Tr1, and load is connected to
The both ends of 5th capacitor C5, the voltage of inverter circuit (and IGBT bridge arm) inversion output, one group of electric current is by first resistor R1, the
After one capacitor C1 and second resistance R2, it is added on the first winding N1 of transformer Tr1, it is defeated by the 4th winding N4 after decompression
Load is arrived out, the electric current of load can effectively be monitored, and can be effectively protected IGBT not by the damage of instantaneous short circuit electric current
It is bad.
The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to
The specific embodiment stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, these are belonged within the protection of the utility model.
Claims (5)
1. a kind of switching power supply of frequency converter circuit, which is characterized in that including first resistor, first capacitor, second resistance, the one or two
Pole pipe, field-effect tube and integrated circuit, one end of the first resistor and the output loop of IGBT connect, described for detecting
The current signal of IGBT output,
The other end of the first resistor is coupled to the sampled signal input terminal of the integrated circuit, and the current signal is defeated
Enter the integrated circuit, be compared with the reference signal in the integrated circuit,
One end of the first capacitor and one end of the second resistance are connect with the positive voltage output end of the IGBT, and described
The other end of one capacitor and the other end of the second resistance are connect with the cathode of the first diode, the first diode
Anode be coupled to the drain electrode of the field-effect tube, the grid of the field-effect tube is coupled to the signal output of the integrated circuit
End,
If the current signal is greater than the reference signal, the integrated circuit is believed to field-effect tube output low level
Number, the low level signal is for closing the field-effect tube, so that the output loop open circuit of the IGBT.
2. switching power supply of frequency converter circuit according to claim 1, which is characterized in that further include transformer and the two or two pole
Pipe, the transformer have the first winding and the second winding, one end of first winding and one end of the first capacitor and
One end of the second resistance connects jointly, and the other end of first winding is coupled to the anode of the first diode,
One end of second winding is coupled to the anode of second diode, the other end of second winding and described the
One end of one resistance connects.
3. switching power supply of frequency converter circuit according to claim 1, which is characterized in that further include the second capacitor and third electricity
Resistance, the cathode of second capacitor connect with the negative voltage output end of the IGBT, and positive and described the of second capacitor
One end of three resistance connects, and the other end of the 3rd resistor is coupled to the positive voltage output end of the IGBT.
4. switching power supply of frequency converter circuit according to claim 1, which is characterized in that further include third diode and photoelectricity
The cathode of coupler, the third diode is connect with the signal input part of the photoelectrical coupler, the photoelectrical coupler
Signal output end is connect with the reference signal end of the integrated circuit.
5. switching power supply of frequency converter circuit according to claim 4, which is characterized in that further include the 4th resistance and third electricity
Hold, one end of the 4th resistance is connect with the reference voltage output end of the integrated circuit, the other end of the 4th resistance
It is coupled to the anode of the third capacitor, the cathode of the third capacitor is connect with the common end of the integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920615011.9U CN209627245U (en) | 2019-04-29 | 2019-04-29 | A kind of switching power supply of frequency converter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920615011.9U CN209627245U (en) | 2019-04-29 | 2019-04-29 | A kind of switching power supply of frequency converter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209627245U true CN209627245U (en) | 2019-11-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920615011.9U Active CN209627245U (en) | 2019-04-29 | 2019-04-29 | A kind of switching power supply of frequency converter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209627245U (en) |
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2019
- 2019-04-29 CN CN201920615011.9U patent/CN209627245U/en active Active
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