CN202818113U - Fly-back switch power supply circuit - Google Patents
Fly-back switch power supply circuit Download PDFInfo
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- CN202818113U CN202818113U CN2012205188329U CN201220518832U CN202818113U CN 202818113 U CN202818113 U CN 202818113U CN 2012205188329 U CN2012205188329 U CN 2012205188329U CN 201220518832 U CN201220518832 U CN 201220518832U CN 202818113 U CN202818113 U CN 202818113U
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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 fly-back switch power supply circuit. The fly-back switch power supply circuit comprises an AC (Alternating Current) rectifying circuit, an electromagnetic interference filtering circuit, a starting circuit, a fly-back switch circuit, an output rectifying filtering circuit, a control circuit and a feedback circuit. The input end of the electromagnetic interference filtering circuit is connected with the output end of the AC rectifying circuit. The input end of the starting circuit is connected with the output end of the electromagnetic interference filtering circuit. The input end of the fly-back switch circuit is connected with the output end of the starting circuit. The output end of the fly-back switch circuit is connected with the input end of the starting circuit. The input end of the control circuit is connected with the output ends of the starting circuit, the fly-back switch circuit and the feedback circuit while the output end of the control circuit is connected with the input end of the fly-back switch circuit. Compared with a conventional power supply circuit, the fly-back switch power supply circuit has the advantages of fewer peripheral components, low cost and extremely low standby power consumption.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of low-cost inverse-excitation type switch power-supply circuit of novel integrated switch pipe.Adopt larger starting resistance, realize " zero " current start and low current operating characteristic, reduce the system standby power consumption, satisfy the stand-by power consumption 30mW of five-star charger even lower requirement, and the requirement of Energy Star newest standards.
Background technology
Global energy day is becoming tight, the especially trend of the times of energy-saving and emission-reduction, green energy resource.Relevant Energy Efficiency Standard is more and more stricter, and six grades of new efficiencies have proposed 100mW standby requirement, and the famous cell phone manufacturers such as Samsung, LG, Nokia have released stricter standby classifying system jointly, and the charger stand-by power consumption is decided to be five-star charger less than 30mW.Therefore, how to adopt lower cost solution, realize super-low standby power consumption, become the competitive advantage of power management IC manufacturer.
The utility model content
In view of above problem, the utility model proposes a kind of low-cost inverse-excitation type switch power-supply circuit of novel integrated switch pipe.
Inverse-excitation type switch power-supply circuit according to an embodiment of the present utility model comprises: an ac rectifier, and the input of this ac rectifier is connected with an AC power; One electromagnetic interference filter circuit, the input of this electromagnetic interference filter circuit is connected with the output of this ac rectifier; One start-up circuit, the input of this start-up circuit is connected with the output of this electromagnetic interference filter circuit; One anti-energizing switch circuit, the input of anti-energizing switch circuit is connected with the output of this start-up circuit, and the output of this anti-energizing switch circuit is connected with the input of this start-up circuit; One output rectifier and filter, the input of this output rectifier and filter is connected with the output of anti-energizing switch circuit, and the output of this output rectifier and filter is connected with a load; One control circuit, the input of this control circuit is connected with the output of the output of this start-up circuit, this anti-energizing switch circuit and the output of feedback circuit, the output of this control circuit is connected with the input of anti-energizing switch circuit, wherein this control circuit comprises a pulse width modulation control switch chip at least, and this pulse width modulation control switch chip comprises eight function pin; And a feedback circuit, the input of this feedback circuit is connected with the output of anti-energizing switch circuit, and the output of this feedback circuit is connected with the input of this control circuit.
Overcome present technical bottleneck according to inverse-excitation type switch power-supply circuit of the present utility model, and peripheral part is few with respect to existing power circuit, cost is low and stand-by power consumption is extremely low.
Description of drawings
From below in conjunction with accompanying drawing to understanding better the utility model the description of embodiment of the present utility model, wherein:
Fig. 1 shows the block diagram according to the inverse-excitation type switch power-supply circuit of the utility model embodiment;
Fig. 2 shows the circuit diagram according to the inverse-excitation type switch power-supply circuit of the integrated switch pipe of the utility model embodiment;
Fig. 2 a illustrates the multiple connection of electromagnetic interference filter circuit;
Fig. 2 b shows the multiple connection of absorbing circuit; And
Fig. 2 c shows two kinds of connections of two kinds of reinforced output rectifier and filters.
Embodiment
The below will describe feature and the exemplary embodiment of the utility model various aspects in detail.Many details have been contained in following description, in order to provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that in the situation of some details that the utility model can be in not needing these details and implement.The below only is in order to provide the clearer understanding of the utility model by example of the present utility model is shown to the description of embodiment.Any concrete configuration that proposes below the utility model never is limited to, but any modification, replacement and the improvement that under the prerequisite that does not break away from spirit of the present utility model, have covered coherent element or parts.
The utility model proposes a kind of inverse-excitation type switch power-supply circuit.Fig. 1 shows the block diagram according to the inverse-excitation type switch power-supply circuit of the utility model embodiment.As shown in Figure 1, this inverse-excitation type switch power-supply circuit comprises ac rectifier A, electromagnetic interference filter circuit B, start-up circuit C, anti-energizing switch circuit D, output rectifier and filter E and control circuit F and feedback circuit G, and anti-energizing switch circuit D also comprises absorbing circuit H.
Wherein the input of ac rectifier A is connected with AC power, and output is connected with the input of electromagnetic interference filter circuit B; The input of electromagnetic interference filter circuit B is connected with the output of ac rectifier A, and output is connected with the input of start-up circuit C; The input of start-up circuit C is connected with the output of electromagnetic interference circuit B, and output is connected with the input of anti-energizing switch circuit D and the input of control circuit F; The input of anti-energizing switch circuit D is connected with the output of the output of start-up circuit C and control circuit F, and output is connected with the input of feedback circuit G, the input of output rectifier and filter E and the input of control circuit F; The input of output rectifier and filter E is connected with the output of anti-energizing switch circuit D, and output is connected with load; The input of control circuit F is connected with the output of the output of start-up circuit C, anti-energizing switch circuit D and the output of feedback circuit G, and output is connected with the input of anti-energizing switch circuit D; The input of feedback circuit G is connected with the output of anti-energizing switch circuit D, and output is connected with the input of control circuit F.
Fig. 2 shows the circuit diagram according to the inverse-excitation type switch power-supply circuit of an embodiment of the present utility model.As shown in Figure 2, the inverse-excitation type switch power-supply circuit according to an embodiment of the present utility model comprises ac rectifier 1, electromagnetic interference (EMI) filter circuit 2, start-up circuit 3, absorbing circuit 4, anti-energizing switch circuit 5, output rectifier and filter 6, feedback circuit 7 and control circuit 8.
In the embodiment shown in Figure 2, ac rectifier 1 comprises fuse resistance RF (FUSE) and rectifier diode D1～4, and Main Function is that alternating voltage is carried out rectification.Wherein, the minimum number of rectifier diode can be one, can be at most eight.Fuse also can use fuse resistance, wire resistor or inductance to replace.
In the embodiment shown in Figure 2, EMI filter circuit 2 comprises inductance L 1, L2, high-voltage electrolytic capacitor C1, C2 and static discharge (ESD) resistance R 7, and Main Function is filtering after inhibition EMI and the rectification.According to different application, can be with an inductance, two inductance in the EMI filter circuit, also can be only with a common mode inductance; Can be only with a high-voltage electrolytic capacitor; And also can be without esd discharge resistance R 7 in some occasion.Fig. 2 a shows the multiple connection of EMI filter circuit, and wherein R7 is esd discharge resistance, its can serial or parallel connection to reach required resistance, also can cancel.
In the embodiment shown in Figure 2, start-up circuit 3 Main Functions are to charge to capacitor C 3 by starting resistance R1, R2, connect the function pin PIN-B of control circuit 8, through internal control circuit, give start-up capacitance C4 charging, start control circuit 8 purposes thereby reach.Starting resistance can be selected larger resistance, realizes " zero " current start, reduces the power loss of start-up circuit, reduces the system standby power consumption.
In the embodiment shown in Figure 2, absorbing circuit 4 can change according to different system requirements.Further, absorbing circuit also can fully phase out according to different market demands, thereby further reduces cost.Fig. 2 b shows the multiple connection of absorbing circuit.
In the embodiment shown in Figure 2, anti-energizing switch circuit 5 comprises flyback transformer T1 and current sense resistor Ns, and Main Function is to convert the high-voltage dc voltage behind the AC rectification to secondary lower alternating voltage by flyback transformer T1.Current sense resistor Ns can reach in the mode of serial or parallel connection needed resistance.
In the embodiment shown in Figure 2, output rectifier and filter 6 comprises output rectifier diode D4 and two major parts of filter capacitor Co.For different output ripple requirements, output rectifier and filter 6 can increase π type filter circuit or common mode filtering circuit improves filter effect.Fig. 2 c shows two kinds of connections of two kinds of reinforced output rectifier and filters, reaches different ripple requirements.
In the embodiment shown in Figure 2, feedback circuit 7 comprises sample resistance R5, R6, and Main Function is that the secondary alternating voltage (alternating voltage on the feedback winding) that utilizes sample resistance to induce in proportion by the elementary power supply winding of transformer is delivered to control circuit 8.Do not have optocoupler and secondary benchmark pressurizer from principle, thereby significantly reduced cost.Sample resistance can reach in the mode of serial or parallel connection needed resistance.
In the embodiment shown in Figure 2, the main devices of control circuit 8 is a pulse width modulation (PWM) control switch chip IC 1 and necessary peripheral accessory part.Such as, the control switch chip of OB2552 or similar functions, this chip (IC1) comprise 8 function pin PIN-A...PIN-H altogether, are respectively: power supply pin (PIN-A), be used to this chip that operating voltage is provided, be connected with the output of start-up circuit 3; Drive pin (PIN-B), be connected with the output of start-up circuit 3, be used for the inner integrated switch tube working status of control chip, directly link to each other with the grid of the integrated switching tube MOSFET in inside in the chip; Feedback signal pin (PIN-C) for detection of the output voltage of inverse-excitation type switch power-supply circuit, is connected with the output of feedback circuit 7; Current detecting pin (PIN-D), for detection of the primary current of anti-energizing switch circuit 5, and according to the shutoff of the inner integrated switch pipe of detected Current Control MOSFET; Switching tube drain electrode pin (PIN-E/F) is connected with the output of anti-energizing switch circuit 5; And grounding leg (PIN-G/H), be used for ground connection (PIN pin order is not limited to said sequence).
Below with reference to specific embodiment of the utility model the utility model is described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not break away from the spirit and scope of the present utility model that limited by claims or its equivalent.In addition, it only is exemplary that any signal arrows in the accompanying drawing should be considered to, rather than restrictive, unless concrete indication is arranged in addition.Separate or the ability of combination when not knowing when term is also contemplated as to make, the combination of assembly or step also will be considered to put down in writing.
Claims (9)
1. inverse-excitation type switch power-supply circuit comprises:
One ac rectifier, the input of this ac rectifier is connected with an AC power;
One electromagnetic interference filter circuit, the input of this electromagnetic interference filter circuit is connected with the output of this ac rectifier;
One start-up circuit, the input of this start-up circuit is connected with the output of this electromagnetic interference filter circuit;
One anti-energizing switch circuit, the input of anti-energizing switch circuit is connected with the output of this start-up circuit, and the output of this anti-energizing switch circuit is connected with the input of this start-up circuit;
One output rectifier and filter, the input of this output rectifier and filter is connected with the output of anti-energizing switch circuit, and the output of this output rectifier and filter is connected with a load;
One control circuit, the input of this control circuit is connected with the output of the output of this start-up circuit, this anti-energizing switch circuit and the output of feedback circuit, the output of this control circuit is connected with the input of anti-energizing switch circuit, wherein this control circuit comprises a pulse width modulation control switch chip at least, and this pulse width modulation control switch chip comprises eight function pin; And
One feedback circuit, the input of this feedback circuit is connected with the output of anti-energizing switch circuit, and the output of this feedback circuit is connected with the input of this control circuit.
2. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this anti-energizing switch circuit further comprises an absorbing circuit, across the two ends of the armature winding of the flyback transformer in this anti-energizing switch circuit.
3. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this ac rectifier comprises fuse resistance and at least one rectifier diode.
4. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this electromagnetic interference filter circuit comprises that at least one inductance, at least one high-voltage electrolytic capacitor and a static discharge resistance are to suppress filtering after electromagnetic interference and the rectification.
5. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this start-up circuit is used for by at least one starting resistance to a capacitor charging, and connect one of this control chip and drive pin, this grid that drives in pin and the control switch chip as the MOSFET of switching device links to each other.
6. such as claim 1 described inverse-excitation type switch power-supply circuit, wherein this start-up circuit is by starting resistance, before startup to the power supply capacitor charging.
7. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this anti-energizing switch circuit comprises a flyback transformer and a current sense resistor, is used for converting the high-voltage dc voltage behind the AC rectification to secondary lower alternating voltage by this flyback transformer.
8. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this output rectifier and filter comprises output rectifier diode and a filter capacitor.
9. inverse-excitation type switch power-supply circuit as claimed in claim 1, wherein this feedback circuit comprises a plurality of sample resistances, the secondary alternating voltage that is used for utilizing described sample resistance to induce in proportion by the elementary power supply winding of transformer is delivered to this control circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205188329U CN202818113U (en) | 2012-10-10 | 2012-10-10 | Fly-back switch power supply circuit |
| TW101222897U TWM455297U (en) | 2012-10-10 | 2012-11-26 | Reverse-exciting type switch power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012205188329U CN202818113U (en) | 2012-10-10 | 2012-10-10 | Fly-back switch power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202818113U true CN202818113U (en) | 2013-03-20 |
Family
ID=47876919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012205188329U Expired - Lifetime CN202818113U (en) | 2012-10-10 | 2012-10-10 | Fly-back switch power supply circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202818113U (en) |
| TW (1) | TWM455297U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020198440A1 (en) * | 2019-03-26 | 2020-10-01 | Google Llc | Direct current (dc) bus electromagnetic interference (emi) filtering for power adapters |
-
2012
- 2012-10-10 CN CN2012205188329U patent/CN202818113U/en not_active Expired - Lifetime
- 2012-11-26 TW TW101222897U patent/TWM455297U/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020198440A1 (en) * | 2019-03-26 | 2020-10-01 | Google Llc | Direct current (dc) bus electromagnetic interference (emi) filtering for power adapters |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM455297U (en) | 2013-06-11 |
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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: 20130320 |