CN201044417Y - Minitype frequency converter - Google Patents
Minitype frequency converter Download PDFInfo
- Publication number
- CN201044417Y CN201044417Y CNU2007200368678U CN200720036867U CN201044417Y CN 201044417 Y CN201044417 Y CN 201044417Y CN U2007200368678 U CNU2007200368678 U CN U2007200368678U CN 200720036867 U CN200720036867 U CN 200720036867U CN 201044417 Y CN201044417 Y CN 201044417Y
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Abstract
The utility model relates to a miniature frequency converter (IC5), which is characterized in that a control circuit of the utility model mainly adopts that: an input end of a power input circuit is connected with a rectifier circuit; the rectifier circuit is connected respectively with a charging resistance and a relay; the charging resistance is connected with a filter circuit; the filter circuit is connected respectively with an inverter circuit and a switching power circuit; the inverter circuit is connected with a power output circuit; the power output circuit is connected with a microprocessor; the microprocessor is connected respectively with the inverter circuit and a display-control input panel; the power output circuit is connected with a current sensor. The utility model is applied to small-capacity motor occasions, can regulate the frequency of power supply, and inhibits reverse voltage, frequency fluctuation, transient current failure of power supply, etc. A wiring terminal can execute wire connection on the premise without dismounting an upper cover, which is convenient for direct installation of users, and saves time as well as labor. Moreover, the utility model is characterized in small volume, high precision, low noise, reliable running, simple operation, convenient maintenance, etc.
Description
Technical field
The utility model relates to a kind of micro frequency transformer (IC5), specifically is mainly used in the small-capacity motor occasion, suppresses reverse voltage, the fluctuation of frequency and the instant cut-off of power supply etc.
Background technology
The device that the constant alternating current of voltage and fixed-frequency is transformed to the alternating current of voltage or changeable frequency is called " frequency converter ".In order to produce variable voltage and frequency, this equipment at first will be transformed to direct current to the alternating current of power supply, direct current is transformed to the device of alternating current.Use motor is not only arranged in the household appliances of frequency converter (for example air-conditioning etc.), also have products such as fluorescent lamp.The frequency converter that is used for Electric Machine Control both can change voltage, can change frequency again.But the frequency converter that is used for fluorescent lamp is mainly used in the frequency of regulating the power supply power supply.The for example power supply of computer power supply, in this application, frequency converter is used to suppress the fluctuation of reverse voltage, frequency and the instant cut-off of power supply.
In prior art, the control circuit of frequency converter generally is made up of rectification circuit, intermediate dc link circuit, inverter circuit and 4 parts of control circuit.Rectifying part is the uncontrollable rectifier of three-phase bridge, and inversion is the power inverter three-phase bridge type converter partly, and is output as pulse-width modulation waveform, and the intermediate dc link is filtering, dc energy storage and buffering reactive power.Though the control circuit of this kind structure is simple, power is lower.
On frequency changer, the most cables that adopt of wiring board upper-part weld, and along with the passing of operating time, pad is easy to generate bad, influences product quality.Binding post needs loam cake is taken apart and could wiring be connected, and is unfavorable for using and installs.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned weak point, thereby a kind of micro frequency transformer is provided, and can regulate the frequency of power supply power supply, and it is little to have a volume, the precision height, and noise is low, and is reliable, simple to operate, easy to maintenance, characteristics such as energy savings.
Main solution of the present utility model is achieved in that
The utility model mainly adopts control circuit board, power panel is set in housing, control circuit is located on control circuit board and the power panel, feature is that the power supply input circuit output connects rectification circuit input end, described power supply input circuit input power supply outputs to filter circuit by rectification circuit, prevents surge voltage damage frequency converter; Described rectification circuit converts alternating current to direct current;
The output of rectification circuit connects the input of charging resistor and relay respectively, and described charging resistor is to be used for limiting impulse current, prevents that diode (led) module from damaging;
Described relay be frequency converter start finish after the charging resistor short circuit, the resistance of frequency converter internal circuit is reduced, the minimizing electrical loss;
The output circuit of charging resistor is connected to the filter circuit input circuit, and described filter circuit is from the power supply input circuit input current, uses electrolytic capacitor filtering, makes current conversion become direct current;
The output of filter circuit is connected with the input of inverter circuit, and described inverter circuit is that direct current is transformed into AC power, and the signal of inverter is controlled by microprocessor;
The output of inverter circuit connects the input of power output circuit, described power output circuit be from the inverter circuit output current to power output circuit, power output circuit electric current output current is to motor; Output signal is to inverter circuit;
Switching power circuit connects microprocessor, obtains power supply from filter circuit, and the out-put supply signal is to microprocessor;
The output of microprocessor connects the input of inverter circuit and demonstration and control input panel, and the input of microprocessor connects current sensor, control panel and Switching Power Supply.Microprocessor is used for computing and processing signals;
Described demonstration and input panel circuit are state and the control of conversion devices that shows frequency converter, and panel is from the microprocessor input signal, and output signal is to microprocessor again.
Power output circuit connects current sensor, and described current sensor detects size of current from power output circuit, carries out conversion of signals, feeds back to microprocessor again.
Compared with the prior art the utility model has the following advantages:
The utility model can be regulated the frequency of power supply power supply, suppresses reverse voltage, the fluctuation of frequency and the instant cut-off of power supply etc.; Control terminal, power supply terminal just can carry out wiring under without the prerequisite of dismounting loam cake, be convenient to the user and directly install, and save time and laborsaving; And it is little to have a volume, precision height, characteristics such as noise is low, and is reliable, simple to operate, easy to maintenance.
Description of drawings
Fig. 1 is the utility model schematic perspective view.
Fig. 2 shows for the utility model and control input panel structural representation.
Fig. 3 is the utility model internal structure schematic diagram.
Fig. 4 is the utility model circuit frame principle figure.
Fig. 5 is the utility model switching power circuit components and parts catenation principle figure.
Embodiment
Embodiment during following the utility model is incited somebody to action in conjunction with the accompanying drawings is further described:
As Fig. 1, Fig. 2, shown in Figure 3: the utility model is mainly used in the small-capacity motor occasion, thus require the volume of frequency converter own little, good heat dissipation effect.Be the height of product and width, or internal structure layout, product weight all pursue a kind of miniaturization, meeting customer need is installed in all parts in the loam cake 1.Loam cake 1 side has the heat radiation window, and good heat dissipation effect is installed cooling fan 9 below housing, force cooling.Human-computer dialogue is adopted and is touched rotary button 4, shows that adopting LED number (7 sections show 3) shows that She Ji effect is that cost is low like this, and guidance panel adopts the design style of circular arc, key shape anthropomorphic dummy points shape, contacts with operation is very easy hommization more.Electric capacity 5, power inverter 6 are arranged on control circuit board 10 and the power panel 11, and power panel 11 closely is connected with radiator 8 and fan torque inside subject structure.Control circuit board 10 and power panel 11 vertical distribution have significantly reduced the space in housing 12.Mainly be provided with control loop parts such as digital signal microprocessor and demonstration and input panel circuit on the control circuit board 10, belong to the light current parts.On power panel 11, be provided with rectification circuit, charging resistor, filter circuit, inverter circuit, power supply output, relay, switching power circuit, current sensor etc.Foregoing circuit is connected to control circuit by lead.Control terminal 2, power supply terminal 7 just can carry out wiring under without the prerequisite of dismounting loam cake 1, be convenient to the user and directly install, and save time and laborsaving.
Be illustrated in figure 4 as the utility model control circuit: 1, the power supply input circuit output is connected to the input of rectification circuit: power supply input circuit mainly is a power input terminal, and piezo-resistance is formed.Import 220 volts/380 volts AC power, wherein contain piezo-resistance, be used for protecting the internal circuit of frequency converter, prevent surge voltage damage frequency converter.2, the output of rectification circuit connects the power supply input circuit input, and again by rectification circuit, rectification circuit mainly is that diode is formed, and alternating current becomes direct current through after the diode, passes through after the electrochemical capacitor filtering again, converts constant DC to.
3, the output of rectification circuit connects the input of charging resistor and relay, and described charging resistor is when frequency converter starts, and charging resistor is to be used for limiting impulse current, prevents that diode (led) module from damaging; Described relay is after the normal operation of frequency converter, and relay is connected, and the charging resistor short circuit, the resistance of frequency converter internal circuit is reduced.Reduce and use electrical loss.
4, the output circuit of charging resistor connects the input circuit of filter circuit, and described filter circuit mainly is that electrochemical capacitor is formed, and from the power supply input circuit input current, uses electrolytic capacitor filtering, makes electric current near direct current.5, the output of filter circuit connects the input of inverter circuit: inverter circuit mainly is that power inverter and voltage stabilizing circuit are formed; The input of inverter circuit is to come from filter circuit; The main effect of inverter circuit is that direct current is transformed into AC power, and the signal of inverter is controlled by microprocessor.6, the output of inverter circuit connects the input of power output circuit: power output circuit mainly is that power output terminal is formed; Power output circuit be from the inverter circuit output current to power output circuit, power output circuit electric current output current is to motor.Output signal is to inverter circuit.
7, filter circuit connects switching power circuit: obtain power supply behind filter circuit; Effect is to provide suitable power supply for microprocessor.Its output signal is the 5V power supply.
8, output end of microprocessor connects inverter circuit, shows and the control input panel.The microprocessor input connects current sensor, control panel and Switching Power Supply.Microprocessor is used for computing and processing signals.9, power output circuit connects current sensor: current sensor detects size of current from power output circuit, carries out conversion of signals, feeds back to microprocessor again.10, demonstration and control input panel: the control input panel mainly is state and the control of conversion device that shows frequency converter.Panel is from the microprocessor input signal, and output signal is to microprocessor again.
As shown in Figure 5: the utility model switching power circuit (module) components and parts annexation is as follows:
This switching power circuit (module) adopts pulse width modulation mode, major loop is made up of primary winding and power field effect transistor Q1, by ratio by time that discharges and recharges of resistance R 55, capacitor C 33 and secondary coil control, control the conducting of field effect transistor Q1 and end, regulate the duty ratio of input successively.Secondary coil is by terminal 6,8, and diode D11 and capacitor C 38 are formed the output of 24V direct current.
1, direct current inlet wire P1 (310 volts) is directly connected to transformer.
2, resistance R 48 resistance and capacitor C 22 electric capacity parallel connections, an end links to each other with galvanic input, and an other end connects diode D5.The other end of diode D5 connects transformer and field effect transistor Q1.
3, the control end of field effect transistor Q1 is drawn by the emitter of triode Q2.An other end is connected to resistance R 53 and resistance R 54.
4, an end of resistance R 49 is connected to P1, an end and resistance R 50, resistance R 51 series connection.After three resistance series connection, be connected to the collector electrode of triode Q2.
5, voltage stabilizing didoe ZD4 and resistance R 52 resistance are connected in parallel between the base stage and collector electrode of field effect transistor Q1.
6, resistance R 53 links to each other with field effect transistor Q1 with resistance R 54 ends later in parallel.The zero potential DCN of one end connecting circuit connects.
7, triode Q2 is connected between the base stage and zero potential DCN of field effect transistor.
8, after resistance R 55 and capacitor C 23 series connection, receive respectively on the base stage and transformer of field effect transistor.
9, after diode D6 and resistance R 56 series connection, be connected on the base stage and transformer of triode Q2.
10, voltage stabilizing didoe ZD5 and resistance R 57 series connection connect capacitor C 24, are connected to zero potential DCN.
11, diode D7 plays rectification and filter action with after capacitor C 26 is connected, output 24V DC power supply.
12, transformer outlet side power supply is through after the rectifier diode D8, again with capacitor C 27, and capacitor C 28 parallel connections, series connection voltage stabilizing IC (U4) is again after the filtering, output 5V power supply.Signal CM is the common port of out-put supply.
13, after the other output tap process diode D9 rectification and capacitor C 31 filtering of transformer, output 15V voltage.
14, resistance R 77 and resistance R 78 protective circuits that play a part in parallel.
15, the tap of transformer is through diode D10 and capacitor C 32 and inductance L 1 output 3.3V voltage.After 33 filtering of P3.3 process capacitor C, be connected to zero potential DCN.
16,15V current potential P15 is connected to photoelectrical coupler P capacitor C 1 through resistance R 56.3.3V voltage provides 2.5V reference voltage through resistance R 59 to pressurizer resistance R EF1 to photoelectrical coupler.Resistance R 60 is connected in parallel on pressurizer REF1 two ends, plays a part stable.
The concrete principle analysis of circuit:
1, resistance R 48, capacitor C 22, and diode D5 forms buffering and absorbs circuit, in order to absorb the due to voltage spikes pulse that field effect transistor Q1 causes owing to transformer leakage inductance in turn off process.
2, when input P1 adds direct voltage, electric current is through resistance R 49, resistance R 50, resistance R 51 and resistance R 52 flow to negative pole, and field effect transistor Q1 is a N channel power field-effect transistor, and the voltage between field effect transistor Q1 grid 1 and the source electrode 3 is the voltage at resistance R 52 two ends, according to the Miller effect, make field effect transistor Q1 conducting, need to surpass the 20nC electric weight, at this moment field effect transistor Q1 is in off state.
3, in addition, through resistance R 49, resistance R 50, the one part of current of resistance R 51 is by resistance R 55, and to 23 chargings of energy-storage travelling wave tube capacitor C, what of electric weight the number of turn decision of the capacity of capacitor C 23 and secondary coil (9,10 ends of transformer TF1) store.When charging finishes, field effect transistor Q1 conducting, i.e. primary winding (12,14 terminals of transformer TF1) energising.Direct voltage is supplied with continuously and is finished by resistance R 55 and capacitor C 23 between field effect transistor Q1 grid 1 and the source electrode 3.
4, the effect of voltage stabilizing didoe ZD4 can help to discharge the electric weight of capacitor C 23, and can vise the voltage between field effect transistor Q1 grid 1 and the source electrode 3, makes voltage be no more than 18V.
5, meanwhile, the voltage of secondary coil (9,10 ends of transformer TF1) output is by diode D6, voltage stabilizing didoe ZD5, resistance R 57 is to capacitor C 24 chargings, when the voltage at capacitor C 24 two ends surpasses 0.7V, triode Q2 conducting, capacitor C 23 deep discharges, field effect transistor Q1 is turned off, reverse voltage occurs, cause photoelectrical coupler and capacitor C 24 discharging current to occur by resistance R 6, two diode D6.
6, when the voltage at capacitor C 24 voltage two ends was lower than 0.7V, field effect transistor Q1 ended, and electric current charges to energy-storage travelling wave tube capacitor C 23 again by resistance R 55.So duty ratio of the size of voltage, voltage stabilizing didoe ZD5, resistance R 57, capacitor C 24 and the photoelectrical coupler electric current of secondary coil (9,10 ends of transformer TF1) decision field effect transistor Q1 break-make.
7, secondary coil (1,3 ends of transformer TF1) provides 24V direct voltage, and diode D7 and capacitor C 26 play the effect of rectifying and wave-filtering.
8, secondary coil (2,3 ends of transformer TF1) provides 5V direct voltage, after the filtering through diode D8 rectification and capacitor C 27, by three terminal regulator U4, makes output end voltage keep 5V constant.
9, output 15V direct voltage after secondary coil (7,8 ends of transformer TF1) process diode D9 and capacitor C 31 rectifications and the filtering, resistance R 77 and resistance R 76 play the effect of stable output.
10, after secondary coil (6,8 ends of transformer TF1) process diode D10 and capacitor C 32 rectifications and the filtering,, export the direct voltage of 3.3V again by the L capacitor C filter circuit of L1 and capacitor C 33 compositions.
11, comparator REF1 shunt regulator inside comprises 2.5V bandgap voltage reference, operational amplifier and driver, makes secondary fiducial error amplifier and uses.Resistance R 58 current-limiting resistances (being controlled at below tens milliamperes), capacitor C 25 just plays pressure stabilization function, and resistance R 59 and resistance R 60 have determined that reference voltage is 2.5V.When output voltage is subjected to certain reason that fluctuation takes place, feedback circuit by devices such as comparator REF1 composition, change the electric current of the light-emitting diode that flows through photoelectrical coupler, thereby change the electric current of the grid 1 that flows into field effect transistor Q1, adjust the output duty cycle of field effect transistor Q1, make output voltage stable again.
Claims (3)
1. a micro frequency transformer is provided with control circuit board, power panel in housing, and control circuit is located on control circuit board and the power panel, it is characterized in that the power supply input circuit output connects rectification circuit input end;
Described power supply input circuit input power supply outputs to filter circuit by rectification circuit, prevents surge voltage damage frequency converter; Described rectification circuit converts alternating current to direct current;
Rectification circuit output end connects the input of charging resistor and relay, and described charging resistor is to be used for limiting impulse current, prevents that diode (led) module from damaging;
Described relay is the charging resistor short circuit, and the resistance of frequency converter internal circuit is reduced, and reduces and uses electrical loss;
The charging resistor output connects the input of filter circuit, and described filter circuit is from the power supply input circuit input current, uses electrolytic capacitor filtering, makes current conversion become direct current;
The filter circuit output connects the input of inverter circuit, and described inverter circuit is that direct current is transformed into AC power, and the signal of inverter is controlled by microprocessor;
The inverter circuit output connects the input of power output circuit, described power output circuit be from the inverter circuit output current to power output circuit, power output circuit electric current output current is to motor; Output signal is to inverter circuit;
Switching power circuit connects microprocessor, obtains power supply from filter circuit, and the out-put supply signal is to microprocessor;
Output end of microprocessor and inverter circuit show with the control input panel to be connected.Microprocessor input and current sensor, control panel is connected with Switching Power Supply.Microprocessor is used for computing and processing signals;
Described demonstration and input panel circuit are state and the control of conversion devices that shows frequency converter, and panel is from the microprocessor input signal, and output signal is to microprocessor again.
Power output circuit connects current sensor, and described current sensor detects size of current from power output circuit, carries out conversion of signals, feeds back to microprocessor again.
2. micro frequency transformer according to claim 1 is characterized in that described control circuit board and power panel vertical distribution are in housing.
3. micro frequency transformer according to claim 1 is characterized in that described switching power circuit components and parts annexation is as follows:
(1) direct current inlet wire P1 directly connects transformer;
(2), resistance (R48) resistance and the parallel connection of electric capacity (C22) electric capacity, an end links to each other with galvanic input, an other end connects diode (D5), the other end of diode (D5) connects transformer and field effect transistor (Q1);
(3), the control end of field effect transistor (Q1) is drawn other end connection resistance (R53) and resistance (R54) by the emitter of triode (Q2);
(4), an end of resistance (R49) connects (P1), an end and resistance (R50), resistance (R51) series connection after three resistance series connection, connects the collector electrode of triode (Q2);
(5), (ZD4 and resistance (R52) resistance is connected in parallel between the base stage and collector electrode of field effect transistor (Q1) voltage stabilizing didoe;
(6), resistance (R53) links to each other the zero potential of other end connecting circuit (DCN) with resistance (R54) back in parallel one end with field effect transistor (Q1);
(7), triode (Q2) is connected between the base stage and zero potential (DCN) of field effect transistor;
(8), after the series connection of resistance (R55) and electric capacity (C23), receive respectively on the base stage and transformer of field effect transistor;
(9), after the series connection of diode (D6) and resistance (R56), be connected on the base stage and transformer of triode (Q2);
(10), the series connection of voltage stabilizing didoe (ZD5) and resistance (R57), connect electric capacity (C24), be connected to zero potential (DCN);
(11), diode (D7) is with after electric capacity (C26) is connected, and plays rectification and filter action, the output DC source.
(12), the transformer out-put supply through rectifier diode (D8) after, again with electric capacity (C27), electric capacity (C28) parallel connection, series connection voltage stabilizing (IC) be again after the filtering, out-put supply, signal (CM) is the common port of out-put supply;
(13), output voltage is passed through after diode (D9) rectification and electric capacity (C31) filtering in the other output tap of transformer;
(14), resistance (R77) and resistance (R78) parallel connection, play protective circuit;
(15), after the tap of transformer passes through electric capacity (C33) filtering through diode (D10) and electric capacity (C32) and inductance (L1) output voltage, be connected to zero potential (DCN);
(16), current potential (P15) is connected to photoelectrical coupler (P) through resistance (R56); Voltage to pressurizer resistance (REF1), provides reference voltage to photoelectrical coupler through resistance (R59), and resistance (R60) is connected in parallel on pressurizer (REF1) two ends, plays stabilization.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200368678U CN201044417Y (en) | 2007-05-09 | 2007-05-09 | Minitype frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200368678U CN201044417Y (en) | 2007-05-09 | 2007-05-09 | Minitype frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201044417Y true CN201044417Y (en) | 2008-04-02 |
Family
ID=39259308
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200368678U Expired - Lifetime CN201044417Y (en) | 2007-05-09 | 2007-05-09 | Minitype frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201044417Y (en) |
-
2007
- 2007-05-09 CN CNU2007200368678U patent/CN201044417Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080402 |