CN209571947U - A kind of high power factor switching circuit - Google Patents
A kind of high power factor switching circuit Download PDFInfo
- Publication number
- CN209571947U CN209571947U CN201920498668.1U CN201920498668U CN209571947U CN 209571947 U CN209571947 U CN 209571947U CN 201920498668 U CN201920498668 U CN 201920498668U CN 209571947 U CN209571947 U CN 209571947U
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- China
- Prior art keywords
- circuit
- apfc
- pwm
- power factor
- high power
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a kind of high power factor switching circuits, including EMI and lightning protection circuit, AC-DC rectification circuit, DC-DC power conversion circuit, APFC control circuit and pwm control circuit, the APFC control circuit includes APFC detection circuit, APFC controls chip and first voltage feed circuit, its described pwm control circuit includes second voltage feed circuit, single-chip microcontroller, SCM peripheral circuit, PWM output circuit and PWM drive circuit, the circuit not only can make the power factor of Switching Power Supply be greatly improved, current harmonics can be reduced simultaneously, reduction is polluted caused by power grid, and it is able to maintain the stabilization of output voltage, realize High Power Factor, the target of high reliability and stability.
Description
Technical field
The utility model belongs to power technique fields, especially a kind of high power factor switching circuit.
Background technique
Traditional Switching Power Supply, input circuit generally use full-bridge diode rectification, output termination large bulk capacitance filter
Wave device, although rectifier circuit is simple and reliable, they can draw high peak current in power grid, make the alternating current of input terminal
Waveform is distorted, and generates harmonic wave, harmonic wave (Harmonic) and idle (ReactivePower) to power grid note National People's Congress amount, is caused
Serious power grid " pollution ", and power factor is also relatively low.
Utility model content
The utility model provides a kind of high power factor switching circuit, which not only obtain power factor
Large increase, while current harmonics is also reduced, reduction is polluted caused by power grid.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of high power factor switching circuit, including EMI and lightning protection circuit, AC-DC rectification circuit, DC-DC power
Translation circuit, APFC control circuit and pwm control circuit, the APFC control circuit include APFC detection circuit, APFC control
Chip and first voltage feed circuit, the pwm control circuit include second voltage feed circuit, single-chip microcontroller, outside single-chip microcontroller
Circuit, PWM output circuit and PWM drive circuit are enclosed, the EMI is connected with lightning protection circuit input terminal with electric main, the EMI
It is connected with lightning protection circuit output end with AC-DC rectification circuit input end, the AC-DC rectification circuit input end is also detected with APFC
Circuit input end is connected, and the AC-DC rectification circuit output end is connected with first voltage feed circuit input terminal, the APFC inspection
Slowdown monitoring circuit and first voltage feedback circuit output are connected with APFC control chip, the APFC control chip output and institute
It states AC-DC rectification circuit to be connected, the AC-DC rectification circuit output end is connected with DC-DC power conversion circuit input terminal, described
DC-DC power conversion circuit output end is connected with second voltage feed circuit input terminal, the second voltage feed circuit output
End is connected with single-chip microcontroller, and the single-chip microcontroller is connected with SCM peripheral circuit and PWM output circuit respectively, the PWM output electricity
Road is connected with PWM drive circuit, and the PWM drive circuit is connected with the power switch tube in DC-DC power conversion circuit.
Further, the electric main is 220V or 380V.
Further, when the electric main is 220V, the main circuit of the AC-DC rectification circuit is single-phase rectification bridge,
When the electric main is 380V, the main circuit of the AC-DC rectification circuit is three-phase rectification bridge.
Further, the APFC control chip is the average ionization ratio chip for being exclusively used in PFC
UC3854, UC3854 can complete whole control functions needed for Boost correcting power factors, reach power factor
0.99 or more, the circuit of power factor correction formed using UC3854, when changing between input voltage 85V~270V, AC-DC
Output Voltage in Rectified Circuits can also keep stable, to guarantee that DC-DC power conversion circuit can obtain stable input voltage.
Further, the single-chip microcontroller model AT89C51, this single-chip microcontroller can control the number based on PWM, from
And the DC voltage of output is allow to be set and be adjusted.
Further, the SCM peripheral circuit includes button inputting circuits, light-emitting diode display driving circuit, 8 LED
Display, clock circuit, relay circuit, reset circuit, buzzer circuit and clock/calendar circuit；Clock circuit is by one
Crystal oscillator and two capacitors connect on two pin XTAL0 of single-chip microcontroller and XTAL1, there is RST reset pin in single-chip microcontroller, complete
The reset of single-chip microcontroller can both use hand-reset, and can also have access to electricity reset；LED segment drives core in light-emitting diode display driving circuit
Piece selects 74LS48, and LED driving chips select ULN2003A.
Further, the PWM output circuit realizes that the output to pwm signal controls using control chip TL494.
Further, the PWM drive circuit selects IR2110 circuit.
Further, the power switch tube in the DC-DC power conversion circuit selects the metal-oxide-semiconductor of 700V/10A, model
For 2SK3265.
The DC-DC power conversion circuit adjusts voltage by single-chip microcontroller output PWM, then using PID principle by closing
The mode of ring control, which carries out pressure regulation, makes voltage constantly approach setting value, and single-chip microcontroller uses AT89C51, it is that DC-DC power becomes
The main control unit of circuit is changed, firstly, user inputs preset voltage value by keyboard, this preset value is transmitted to single-chip microcontroller, and passes through
Numeral method comes out, single-chip microcontroller by second voltage feed circuit obtain process variable, then with preset value control variable into
Row related operation, then pwm pulse is sent to PWM output circuit, with this self-adjusting repeatedly, realize the stabilization of output voltage.
Compared with prior art, the utility model has the advantages and positive effects of:
A kind of high power factor switching circuit provided by the utility model, the circuit can not only make the function of Switching Power Supply
Rate factor is greatly improved, while can reduce current harmonics, and reduction is polluted caused by power grid, and is able to maintain output voltage
Stabilization, realize High Power Factor, high reliability and stability target.
Detailed description of the invention
Fig. 1 is the structure principle chart of high power factor switching circuit；
The circuit diagram of Fig. 2 is electric main when being 220V AC-DC rectification circuit；
Fig. 3 is the structure chart of single-chip microcontroller and SCM peripheral circuit.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, any modification, equivalent replacement, improvement and so on should be included in the utility model
Within protection scope.
A kind of high power factor switching circuit, as shown in Figure 1, include EMI and lightning protection circuit, AC-DC rectification circuit,
DC-DC power conversion circuit, APFC control circuit and pwm control circuit, the APFC control circuit include APFC detection circuit,
APFC controls chip and first voltage feed circuit, the pwm control circuit include second voltage feed circuit, single-chip microcontroller,
SCM peripheral circuit, PWM output circuit and PWM drive circuit, the EMI and lightning protection circuit input terminal and electric main phase
Even, the EMI is connected with lightning protection circuit output end with AC-DC rectification circuit input end, and the AC-DC rectification circuit input end is also
It is connected with APFC detection circuit input terminal, the AC-DC rectification circuit output end is connected with first voltage feed circuit input terminal,
The APFC detection circuit and first voltage feedback circuit output are connected with APFC control chip, and the APFC controls chip
Output end is connected with the AC-DC rectification circuit, and the AC-DC rectification circuit output end and DC-DC power conversion circuit input
End is connected, and the DC-DC power conversion circuit output end is connected with second voltage feed circuit input terminal, and the second voltage is anti-
Current feed circuit output end is connected with single-chip microcontroller, and the single-chip microcontroller is connected with SCM peripheral circuit and PWM output circuit respectively, described
PWM output circuit is connected with PWM drive circuit, the power switch tube in the PWM drive circuit and DC-DC power conversion circuit
It is connected.
The electric main is 220V or 380V, as shown in Fig. 2, when the electric main is 220V, the AC-DC rectification
The main circuit of circuit is single-phase rectification bridge, and when the electric main is 380V, the main circuit of the AC-DC rectification circuit is three-phase
Rectifier bridge.
The APFC control chip is average ionization ratio the chip UC3854, UC3854 for being exclusively used in PFC
Whole control functions needed for Boost correcting power factors can be completed, makes power factor up to 0.99 or more, uses
The circuit of power factor correction of UC3854 composition, when changing between input voltage 85V~270V, the output of AC-DC rectification circuit
Voltage can also keep stable, to guarantee that DC-DC power conversion circuit can obtain stable input voltage.
The single-chip microcontroller model AT89C51, this single-chip microcontroller can control the number based on PWM, to make to export
DC voltage can be set and be adjusted.
As shown in figure 3, the SCM peripheral circuit includes button inputting circuits, light-emitting diode display driving circuit, 8 LED
Display, clock circuit, relay circuit, reset circuit, buzzer circuit and clock/calendar circuit；Clock circuit is by one
Crystal oscillator and two capacitors connect on two pin XTAL0 of single-chip microcontroller and XTAL1, there is RST reset pin in single-chip microcontroller, complete
The reset of single-chip microcontroller can both use hand-reset, and can also have access to electricity reset；LED segment drives core in light-emitting diode display driving circuit
Piece selects 74LS48, and LED driving chips select ULN2003A.
The PWM output circuit realizes that the output to pwm signal controls using control chip TL494.
The PWM drive circuit selects IR2110 circuit.
Power switch tube in the DC-DC power conversion circuit selects the metal-oxide-semiconductor of 700V/10A, model 2SK3265.
The DC-DC power conversion circuit adjusts voltage by single-chip microcontroller output PWM, then using PID principle by closing
The mode of ring control, which carries out pressure regulation, makes voltage constantly approach setting value, and single-chip microcontroller uses AT89C51, it is that DC-DC power becomes
The main control unit of circuit is changed, firstly, user inputs preset voltage value by keyboard, this preset value is transmitted to single-chip microcontroller, and passes through
Numeral method comes out, single-chip microcontroller by second voltage feed circuit obtain process variable, then with preset value control variable into
Row related operation, then pwm pulse is sent to PWM output circuit, with this self-adjusting repeatedly, realize the stabilization of output voltage.
Claims (9)
1. a kind of high power factor switching circuit, including EMI and lightning protection circuit, AC-DC rectification circuit, DC-DC power become
Change circuit, APFC control circuit and pwm control circuit, which is characterized in that the APFC control circuit include APFC detection circuit,
APFC controls chip and first voltage feed circuit, the pwm control circuit include second voltage feed circuit, single-chip microcontroller, list
Piece machine peripheral circuit, PWM output circuit and PWM drive circuit, the EMI are connected with lightning protection circuit input terminal with electric main,
The EMI is connected with lightning protection circuit output end with AC-DC rectification circuit input end, the AC-DC rectification circuit input end also with
APFC detection circuit input terminal is connected, and the AC-DC rectification circuit output end is connected with first voltage feed circuit input terminal, institute
It states APFC detection circuit and first voltage feedback circuit output to be connected with APFC control chip, the APFC control chip is defeated
Outlet is connected with the AC-DC rectification circuit, the AC-DC rectification circuit output end and DC-DC power conversion circuit input terminal
It is connected, the DC-DC power conversion circuit output end is connected with second voltage feed circuit input terminal, the second voltage feedback
Circuit output end is connected with single-chip microcontroller, and the single-chip microcontroller is connected with SCM peripheral circuit and PWM output circuit respectively, described
PWM output circuit is connected with PWM drive circuit, the power switch tube in the PWM drive circuit and DC-DC power conversion circuit
It is connected.
2. high power factor switching circuit according to claim 1, which is characterized in that the electric main be 220V or
380V。
3. high power factor switching circuit according to claim 2, which is characterized in that the electric main is 220V
When, the main circuit of the AC-DC rectification circuit is single-phase rectification bridge, when the electric main is 380V, the AC-DC rectified current
The main circuit on road is three-phase rectification bridge.
4. high power factor switching circuit according to claim 3, which is characterized in that the APFC control chip is special
Average ionization ratio chip UC3854 for PFC.
5. high power factor switching circuit according to claim 4, which is characterized in that the single-chip microcontroller model
AT89C51。
6. high power factor switching circuit according to claim 5, which is characterized in that the SCM peripheral circuit packet
Include button inputting circuits, light-emitting diode display driving circuit, 8 light-emitting diode displays, clock circuit, relay circuit, reset circuit, bees
Ring device circuit and clock/calendar circuit.
7. high power factor switching circuit according to claim 6, which is characterized in that the PWM output circuit uses
It controls chip TL494 and realizes that the output to pwm signal controls.
8. high power factor switching circuit according to claim 7, which is characterized in that the PWM drive circuit is selected
IR2110 circuit.
9. high power factor switching circuit according to claim 8, which is characterized in that the DC-DC power conversion electricity
Power switch tube in road selects the metal-oxide-semiconductor of 700V/10A, model 2SK3265.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920498668.1U CN209571947U (en) | 2019-04-15 | 2019-04-15 | A kind of high power factor switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920498668.1U CN209571947U (en) | 2019-04-15 | 2019-04-15 | A kind of high power factor switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209571947U true CN209571947U (en) | 2019-11-01 |
Family
ID=68336034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920498668.1U Expired - Fee Related CN209571947U (en) | 2019-04-15 | 2019-04-15 | A kind of high power factor switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209571947U (en) |
-
2019
- 2019-04-15 CN CN201920498668.1U patent/CN209571947U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191101 Termination date: 20200415 |