CN201742293U - Low-cost self-excited power factor corrector - Google Patents
Low-cost self-excited power factor corrector Download PDFInfo
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- CN201742293U CN201742293U CN2010290680387U CN201029068038U CN201742293U CN 201742293 U CN201742293 U CN 201742293U CN 2010290680387 U CN2010290680387 U CN 2010290680387U CN 201029068038 U CN201029068038 U CN 201029068038U CN 201742293 U CN201742293 U CN 201742293U
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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 relates to the technical field of power factor correctors, in particular to a low-cost self-excited power factor corrector, which comprises a rectifying circuit, a switch tube Q1, a first input end, a second input end, a positive output end, a negative output end, and further comprises a control unit which controls the ON and OFF time of the switch tube Q1, resistors R1, R2, R4, R5 and R6, capacitors C1, C2 and C3, diodes D5, D6 and D7 and triodes Q2 and Q3. As the ON and OFF time of the switch tube Q1 can be controlled by the control unit with a simple structure and low manufacture cost without needing a PWM circuit with a complex structure and high manufacture cost, the production cost of the power factor corrector of the utility model is reduced.
Description
Technical field:
The utility model relates to the power factor corrector technical field, relates in particular to a kind of low-cost auto-excitation type power factor corrector.
Background technology:
Existing auto-excitation type power factor corrector mainly comprises rectification circuit, PWM (PulseWidth Modulation, pulse width modulation) circuit, switching tube, the conducting and the deadline (being duty ratio) of coming the control switch pipe by pwm circuit, thus keep the stable of output voltage.But because manufacturing cost height, the complex structure of pwm circuit make above-mentioned employing pwm circuit come the auto-excitation type power factor corrector of control switch pipe, production cost is higher, circuit structure is complicated.
The utility model content:
The purpose of this utility model is to provide a kind of circuit structure simple low-cost auto-excitation type power factor corrector at the deficiencies in the prior art.
For achieving the above object, the utility model adopts following technical scheme:
A kind of low-cost auto-excitation type power factor corrector, it comprises rectification circuit, switching tube Q1, first input end, second input, cathode output end, cathode output end, also comprise and be used for Q1 conducting of control switch pipe and the control unit of deadline, resistance R 1, R2, R4, R5, R6, capacitor C 1, C2, C3, diode D5, D6, D7, triode Q2, Q3;
Described control unit is by the transformer T1A of homophase, T1B forms, the first input end of rectification circuit is connected with the first input end of power factor corrector, second input of rectification circuit is connected with second input of power factor corrector, first output of rectification circuit and transformer T1A one end, resistance R 4 one ends connect, the transformer T1A other end and switching tube Q1 drain electrode, diode D5 is anodal to be connected, diode D5 negative pole and resistance R 6 one ends, capacitor C 3 positive poles, the cathode output end of power factor corrector connects, resistance R 4 other ends and switching tube Q1 grid, resistance R 1 one ends, resistance R 2 one ends connect, resistance R 2 other ends and capacitor C 1 one ends, diode D6 is anodal to be connected, diode D6 negative pole is connected with triode Q2 collector electrode, triode Q2 base stage is connected with triode Q3 emitter, the triode Q3 base stage and resistance R 6 other ends, resistance R 5 one ends connect, triode Q3 collector electrode and diode D7 negative pole, 2 anodal connections of capacitor C, anodal and capacitor C 1 other end of diode D7, transformer T1B one end connects, second output of rectification circuit, switching tube Q1 source electrode, resistance R 1 other end, triode Q2 emitter, capacitor C 2 negative poles, the transformer T1B other end, capacitor C 3 negative poles, resistance R 5 other ends, the equal ground connection of the cathode output end of power factor corrector.
Described switching tube Q1 is the N-channel MOS field-effect transistor.
Further comprise current foldback circuit; current foldback circuit is made up of voltage-stabiliser tube DZ1, resistance R 3; the positive pole of voltage-stabiliser tube DZ1 is connected with the base stage of triode Q2, and the negative pole of voltage-stabiliser tube DZ1 is connected with an end of resistance R 3, the other end of resistance R 3 and 2 anodal connections of capacitor C.
Further comprise capacitor C X, inductance L 1, fuse F1, capacitor C X is connected between the first input end and second input of rectification circuit, inductance L 1 is connected between the first input end of the first input end of power factor corrector and rectification circuit, and fuse F1 is connected between second input of second input of power factor corrector and rectification circuit.
The utility model beneficial effect is:
A kind of low-cost auto-excitation type power factor corrector that the utility model provides comprises rectification circuit, switching tube Q1, first input end, second input, cathode output end, cathode output end, also comprise and be used for Q1 conducting of control switch pipe and the control unit of deadline, resistance R 1, R2, R4, R5, R6, capacitor C 1, C2, C3, diode D5, D6, D7, triode Q2, Q3.Conducting and deadline that the utility model can come control switch pipe Q1 by control unit simple in structure, low cost of manufacture need not to use manufacturing cost height, baroque pwm circuit, thereby reduce the production cost of power factor corrector.
Description of drawings:
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing the utility model is further described, please refer to Fig. 1, a kind of low-cost auto-excitation type power factor corrector that the utility model provides comprises rectification circuit 1, switching tube Q1, first input end (P1), second input (P2), cathode output end (OUT+), cathode output end (OUT-), also comprise and be used for Q1 conducting of control switch pipe and the control unit of deadline, resistance R 1, R2, R4, R5, R6, capacitor C 1, C2, C3, diode D5, D6, D7, triode Q2, Q3; Described control unit is by the transformer T1A of homophase, T1B forms, the first input end of rectification circuit 1 (B1) is connected with the first input end of power factor corrector, second input (B2) of rectification circuit 1 is connected with second input of power factor corrector, first output (B3) of rectification circuit 1 and transformer T1A one end, resistance R 4 one ends connect, the transformer T1A other end and switching tube Q1 drain electrode (D), diode D5 is anodal to be connected, diode D5 negative pole and resistance R 6 one ends, capacitor C 3 positive poles, the cathode output end of power factor corrector connects, resistance R 4 other ends and switching tube Q1 grid (G), resistance R 1 one ends, resistance R 2 one ends connect, resistance R 2 other ends and capacitor C 1 one ends, diode D6 is anodal to be connected, diode D6 negative pole is connected with triode Q2 collector electrode (c), triode Q2 base stage (b) is connected with triode Q3 emitter (e), the triode Q3 base stage and resistance R 6 other ends, resistance R 5 one ends connect, triode Q3 collector electrode and diode D7 negative pole, 2 anodal connections of capacitor C, anodal and capacitor C 1 other end of diode D7, transformer T1B one end connects, second output (B4) of rectification circuit 1, switching tube Q1 source electrode (S), resistance R 1 other end, triode Q2 emitter, capacitor C 2 negative poles, the transformer T1B other end, capacitor C 3 negative poles, resistance R 5 other ends, the equal ground connection of the cathode output end of power factor corrector.
The switching tube Q1 of present embodiment is the N-channel MOS field-effect transistor.
The utility model further comprises current foldback circuit 2, current foldback circuit 2 is made up of voltage-stabiliser tube DZ1, resistance R 3, the positive pole of voltage-stabiliser tube DZ1 is connected with the base stage of triode Q2, and the negative pole of voltage-stabiliser tube DZ1 is connected with an end of resistance R 3, the other end of resistance R 3 and 2 anodal connections of capacitor C; When output current was excessive, the voltage at capacitor C 2 two ends can raise, and by resistance R 3 with voltage-stabiliser tube DZ1 conducting, and then make triode Q2 conducting, switching tube Q1 is turn-offed, thereby plays the effect of overcurrent protection.
The utility model further comprises capacitor C X, inductance L 1, fuse F1, capacitor C X is connected between the first input end and second input of rectification circuit 1, inductance L 1 is connected between the first input end of the first input end of power factor corrector and rectification circuit 1, and fuse F1 is connected between second input of second input of power factor corrector and rectification circuit 1.
Operation principle of the present utility model is as follows:
Diode D1, D2, D3, D4 forms rectification circuit 1, resistance R 4 is a starting resistance, when input input AC of the present utility model, direct current through rectification circuit 1 rectification output is delivered to switching tube Q1 by resistance R 4, make switching tube Q1 conducting, so transformer T1A just has electric current to pass through, because transformer T1A and transformer T1B homophase, so transformer T1B produces induced voltage, and by capacitor C 1, resistance R 2 makes switching tube Q1 quicken conducting, after passing through the current stabilization of transformer T1A, the magnetic flux of transformer T1A and transformer T1B no longer increases, the induced voltage that makes transformer T1B produce reduces, and then makes the conducting degree of switching tube Q1 reduce, and promptly the electric current by transformer T1A will reduce, flow direction is opposite, cause transformer T1B to produce a negative voltage, acceleration switch pipe Q1 ends, and so repeats said process, promptly realizes the conducting of switching tube Q1 and the control of deadline; When switching tube Q1 conducting, transformer T1A just has electric current to pass through, with power storage in transformer T1A, when switching tube Q1 by the time, the electric energy that is stored among the transformer T1A just can provide electric energy by 3 pairs of loads that are connected output of capacitor C by diode D5 to capacitor C 3 chargings.
Wherein, resistance R 5, resistance R 6, diode D6, triode Q2, triode Q3 form voltage stabilizing circuit, when output voltage surpasses the voltage of setting, voltage by resistance R 5, resistance R 6 will raise, make triode Q3 conducting,, by diode D6 the grid voltage of switching tube Q1 is reduced again for the base stage of triode Q2 provides a conducting voltage, in advance switching tube Q1 is turn-offed and end, reach the purpose that reduces output voltage.
In sum, circuit structure of the present utility model is simple, production cost is low, can be applicable on the products such as Switching Power Supply, electron rectifier, LED power supply.
Certainly, the above only is preferred embodiment of the present utility model, so all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, is included in the utility model patent claim.
Claims (4)
1. low-cost auto-excitation type power factor corrector, it comprises rectification circuit, switching tube Q1, first input end, second input, cathode output end, cathode output end, it is characterized in that: also comprise being used for Q1 conducting of control switch pipe and the control unit of deadline, resistance R 1, R2, R4, R5, R6, capacitor C 1, C2, C3, diode D5, D6, D7, triode Q2, Q3;
Described control unit is by the transformer T1A of homophase, T1B forms, the first input end of rectification circuit is connected with the first input end of power factor corrector, second input of rectification circuit is connected with second input of power factor corrector, first output of rectification circuit and transformer T1A one end, resistance R 4 one ends connect, the transformer T1A other end and switching tube Q1 drain electrode, diode D5 is anodal to be connected, diode D5 negative pole and resistance R 6 one ends, capacitor C 3 positive poles, the cathode output end of power factor corrector connects, resistance R 4 other ends and switching tube Q1 grid, resistance R 1 one ends, resistance R 2 one ends connect, resistance R 2 other ends and capacitor C 1 one ends, diode D6 is anodal to be connected, diode D6 negative pole is connected with triode Q2 collector electrode, triode Q2 base stage is connected with triode Q3 emitter, the triode Q3 base stage and resistance R 6 other ends, resistance R 5 one ends connect, triode Q3 collector electrode and diode D7 negative pole, 2 anodal connections of capacitor C, anodal and capacitor C 1 other end of diode D7, transformer T1B one end connects, second output of rectification circuit, switching tube Q1 source electrode, resistance R 1 other end, triode Q2 emitter, capacitor C 2 negative poles, the transformer T1B other end, capacitor C 3 negative poles, resistance R 5 other ends, the equal ground connection of the cathode output end of power factor corrector.
2. low-cost auto-excitation type power factor corrector according to claim 1 is characterized in that: described switching tube Q1 is the N-channel MOS field-effect transistor.
3. low-cost auto-excitation type power factor corrector according to claim 2; it is characterized in that: further comprise current foldback circuit; current foldback circuit is made up of voltage-stabiliser tube DZ1, resistance R 3; the positive pole of voltage-stabiliser tube DZ1 is connected with the base stage of triode Q2; the negative pole of voltage-stabiliser tube DZ1 is connected with an end of resistance R 3, the other end of resistance R 3 and 2 anodal connections of capacitor C.
4. low-cost auto-excitation type power factor corrector according to claim 2, it is characterized in that: further comprise capacitor C X, inductance L 1, fuse F1, capacitor C X is connected between the first input end and second input of rectification circuit, inductance L 1 is connected between the first input end of the first input end of power factor corrector and rectification circuit, and fuse F1 is connected between second input of second input of power factor corrector and rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010290680387U CN201742293U (en) | 2010-02-02 | 2010-02-02 | Low-cost self-excited power factor corrector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010290680387U CN201742293U (en) | 2010-02-02 | 2010-02-02 | Low-cost self-excited power factor corrector |
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| Publication Number | Publication Date |
|---|---|
| CN201742293U true CN201742293U (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010290680387U Expired - Lifetime CN201742293U (en) | 2010-02-02 | 2010-02-02 | Low-cost self-excited power factor corrector |
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| CN (1) | CN201742293U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447409A (en) * | 2012-01-10 | 2012-05-09 | 南京上科机电工业有限公司 | Low-harmonic rectification circuit |
| CN103457448A (en) * | 2013-09-11 | 2013-12-18 | 昆山新金福精密电子有限公司 | Small-power filtering circuit |
| CN105207464A (en) * | 2015-09-18 | 2015-12-30 | 浙江工业大学 | Self-exciting BJT type bridge-free Zeta PFC rectifier circuit |
-
2010
- 2010-02-02 CN CN2010290680387U patent/CN201742293U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102447409A (en) * | 2012-01-10 | 2012-05-09 | 南京上科机电工业有限公司 | Low-harmonic rectification circuit |
| CN103457448A (en) * | 2013-09-11 | 2013-12-18 | 昆山新金福精密电子有限公司 | Small-power filtering circuit |
| CN105207464A (en) * | 2015-09-18 | 2015-12-30 | 浙江工业大学 | Self-exciting BJT type bridge-free Zeta PFC rectifier circuit |
| CN105207464B (en) * | 2015-09-18 | 2017-09-05 | 浙江工业大学 | Auto-excitation type BJT types are without bridge Zeta PFC rectification circuits |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110209 |
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| CX01 | Expiry of patent term |