CN203827205U - Flyback switching power circuit - Google Patents
Flyback switching power circuit Download PDFInfo
- Publication number
- CN203827205U CN203827205U CN201320539993.0U CN201320539993U CN203827205U CN 203827205 U CN203827205 U CN 203827205U CN 201320539993 U CN201320539993 U CN 201320539993U CN 203827205 U CN203827205 U CN 203827205U
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- circuit
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- input
- flyback
- voltage regulator
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Abstract
The utility model discloses a flyback switching power circuit which comprises an AC input rectification and EMIC filter circuit, a flyback switching circuit, an output filter circuit, a feedback sampling circuit, a control circuit, and a power supply circuit. The input end of the AC input rectification and EMIC filter circuit is connected with an alternating-current power supply, and the output end of the AC input rectification and EMIC filter circuit is connected with the input end of the flyback switching circuit and the input end of the control circuit. The input end of the flyback switching circuit is connected with the output end of the AC input rectification and EMIC filter circuit and the output end of the control circuit, and the output end of the flyback switching circuit is connected with the input end of the output filter circuit, the input end of the power supply circuit, and the input end of the control circuit. The input end of the output filter circuit is connected with the output end of the flyback switching circuit, and the output end of the output filter circuit is connected with the input end of the feedback sampling circuit. The input end of the control circuit is connected with the output end of the AC input rectification and EMIC filter circuit, the output end of the flyback switching circuit, the output end of the feedback sampling circuit, and the output end of the power supply circuit. The output end of the control circuit is connected with the input end of the flyback switching circuit.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of reverse exciting switching voltage regulator circuit.
Background technology
Current era, human society is faced with the pressure that energy resource consumption is excessive, environmental disruption is serious, and energy-saving and emission-reduction are extremely urgent.In order to reduce the energy resource consumption of electric equipment and electronic product, must be optimized their power supply changeover device, to realize higher conversion efficiency and lower static stand-by power consumption.In middle low power field, flyback structure is because the features such as with low cost, simplicity of design are generally adopted.Along with the appearance of various new standard of energy, safety standard, will existing power supply changeover device be proposed to higher specification requirement.Aspect the technical indicators such as conversion efficiency, stand-by power consumption, also there is further improved space in the reverse exciting switching voltage regulator circuit using on the market at present.
Utility model content
In view of above one or more problems, the utility model provides a kind of reverse exciting switching voltage regulator circuit of novelty.
According to reverse exciting switching voltage regulator circuit of the present utility model, comprise AC power input rectifying and electromagnetic interference filter circuit, flyback switching circuit, output filter circuit, feedback sample circuit, control circuit and power supply circuits.Wherein, the input of AC power input rectifying and electromagnetic interference filter circuit is connected with AC power, and output is connected with the input of flyback switching circuit and the input of control circuit; The input of flyback switching circuit is connected with AC power input rectifying and the output of electromagnetic interference filter circuit and the output of control circuit, and output is connected with the input of the input of output filter circuit, the input of power supply circuits and control circuit; The input of output filter circuit is connected with the output of flyback switching circuit, and output is connected with the input of feedback sample circuit; The input of feedback sample circuit is connected with the output of output filter circuit, and output is connected with the input of control circuit; The input of control circuit is connected with the output of AC power input rectifying and electromagnetic interference filter circuit, the output of flyback switching circuit, the output of feedback sample circuit and the output of power supply circuits, and output is connected with the input of flyback switching circuit; And the input of power supply circuits is connected with the output of flyback switching circuit, output is connected with the input of control circuit.
The reverse exciting switching voltage regulator circuit that the utility model provides has the following advantages: conversion efficiency is high, stand-by power consumption is low, start-up time is short and cost is lower.
Accompanying drawing explanation
Below in conjunction with accompanying drawing to understanding better the utility model in the description of embodiment of the present utility model, wherein:
Fig. 1 shows according to the circuit diagram of the reverse exciting switching voltage regulator circuit of the utility model embodiment;
Fig. 2 shows three kinds of connections of thermosensitive circuit 503;
Fig. 3-5 show according to the circuit diagram of the reverse exciting switching voltage regulator circuit of the utility model embodiment, and wherein the system protection circuit in Fig. 3-5 exists slight change compared to Fig. 1;
Connection when Fig. 6 shows system protection pin (PRT) in the pwm chip shown in Fig. 1 and 3-5 for system overheat protector;
Connection when Fig. 7 shows system protection pin (PRT) in the pwm chip shown in Fig. 1 and 3-5 for system overvoltage protection;
Fig. 8 shows the multiple solution of overshoot absorbing circuit 7;
Fig. 9 shows the multiple solution of drive circuit 8; And
Figure 10-Figure 11 shows the multiple connection of power supply circuits 6.
Embodiment
Feature and the exemplary embodiment of the utility model various aspects will be described in detail below.Many details have been contained in description below, to provide complete understanding of the present utility model.But, it will be apparent to one skilled in the art that the utility model can be in the situation that do not need some details in these details to implement.Below the description of embodiment is only used to provide the clearer understanding of the utility model by example of the present utility model is shown.The utility model is never limited to any concrete configuration proposing below, but under the prerequisite that does not depart from spirit of the present utility model, has covered any modification, replacement and the improvement of coherent element or parts.
According to the reverse exciting switching voltage regulator circuit of the utility model embodiment, by control chip and outer member, realize the control of switching circuit and various system protection function.Fig. 1 shows according to the circuit diagram of the reverse exciting switching voltage regulator circuit of the utility model embodiment.
As shown in Figure 1, according to the reverse exciting switching voltage regulator circuit of the utility model embodiment, comprise AC power (AC) input rectifying and electromagnetic interference (EMI) filter circuit 1, flyback switching circuit 2, output filter circuit 3, feedback sample circuit 4, control circuit 5, power supply circuits 6, overshoot absorbing circuit 7 and drive circuit 8.
In the embodiment shown in fig. 1, AC input rectifying and EMI filter circuit 1 comprise fuse (FUSE), two-stage common mode filtering inductance, X electric capacity, piezo-resistance and rectifier bridge output filter capacitor.
In the embodiment shown in fig. 1, flyback switching circuit 2 comprises flyback transformer T, switching tube (MOSFET) and primary current sample resistance.
In the embodiment shown in fig. 1, output filter circuit 3 comprises output rectifier diode and two major parts of filter capacitor.On rectifier diode and have RC absorbing circuit, RC absorbing circuit can be adjusted as required or need not.Output ripple requirement for different, can increase π type filter circuit or common mode filtering circuit in output filter circuit 3.
In the embodiment shown in fig. 1, feedback sample circuit 4 consists of parallel voltage-stabilizing integrated circuit (TL431), light lotus root and feedback resistance and feedback capacity, for the output voltage of this reverse exciting switching voltage regulator circuit is sampled, by TL431, sampled voltage is regulated, and the sampled voltage after regulating is fed back in the control chip in control circuit 5, and then regulate the duty ratio of the switching tube in flyback switching circuit 2.
In the embodiment shown in fig. 1, the main devices of control circuit 5 is a pulse width modulation (PWM) control chip 505 and necessary peripheral auxiliary element.Wherein, pwm chip 505 possesses comprehensive defencive function, can be the control chip of OB2283 or similar functions for example.Particularly, pwm chip 505 comprises 6 pins, the definition of each pin respectively:
Drive pin (GATE), for driving the switching tube of flyback switching circuit 2, be connected with the input of drive circuit;
Output feedback pin (FB), for detection of the output voltage of reverse exciting switching voltage regulator circuit, (that is, being connected with the output of feedback sample circuit 4) is connected with the light lotus root in feedback sample circuit 4;
System protection pin (PRT), for providing system overheat protector and/or output over-voltage protection to pwm chip 505;
Power supply input pin (VDD), is used to pwm chip 505 power supplies, is connected with the output of power supply circuits 6;
Current sample pin (CS), for to the primary current of the transformer of flyback switching circuit 2 voltage signal on sample resistance sample, (current sampling signal by RC filtering then flow into CS pin) is connected with the output of flyback switching circuit 2;
Chip grounding leg (GND), as the reference ground of pwm chip 505.
Wherein, output feedback pin (FB) and the two signal receiving of current sample pin (CS) are exported by the internal arithmetic generation PWM of pwm chip 505.System protection pin (PRT) can provide system overheat protector and over-voltage protecting function simultaneously, also can provide separately system overheat protector or over-voltage protecting function.Wherein, over-voltage protecting function is by utilizing resistance 502 to detect output voltage signals, and when overvoltage occurs in output, makes chip stop that driver output realizes; Overheat protector function is by utilizing temperature-sensitive element 503 and diode 501 detecting system temperature, and when system temperature is too high, makes chip stop that driver output realizes.
In addition, the system protection circuit relevant to system protection pin (PRT) comprises Transformer Winding 201, diode 501, resistor 502, thermosensitive circuit 503 and pwm chip 505.Wherein, one end of a terminating resistor 502 of Transformer Winding 201, another termination GND; One end of one termination Transformer Winding of resistor 502 (auxiliary winding) 201, the system protection pin (PRT) of another termination pwm chip 505 and the anode of diode 501; The anode of diode 501 connects one end of system protection pin (PRT) Yu the resistance 502 of pwm chip 505, and negative electrode connects one end of thermosensitive circuit 503; The negative electrode of one terminating diode 501 of thermosensitive circuit 503, another termination GND.Fig. 2 shows three kinds of connections of thermosensitive circuit 503.As can be seen from Figure 2, thermosensitive circuit can be comprised of conventional, electric-resistance and thermistor, also can only comprise thermistor.Certainly, the element of system protection circuit is only schematically, and it can comprise still less or more element.
In addition, the connection of system protection circuit also can have the slight change shown in Fig. 3, Fig. 4 and Fig. 5.Particularly, with respect to the system protection circuit shown in Fig. 1, there is following variation in the system protection circuit shown in Fig. 3, Fig. 4 and Fig. 5: in Fig. 3, increased resistance 3506, resistance 3506 one end are connected with the system protection pin (PRT) of pwm chip 3505, the anodic bonding of the other end and resistance 3502 and diode 3501; In Fig. 4, exchanged the position of thermosensitive circuit 4503 with diode 4501, wherein one end of thermosensitive circuit is connected with the system control pin (PRT) of resistance 4502 and pwm chip 4505, the anodic bonding of the other end and diode 4501, and the negative electrode of diode 4501 is received reference (GND); In Fig. 5; exchanged the position of thermosensitive circuit 5503 with diode 5501; increased resistance 5506 simultaneously; wherein one end of resistance 5506 is connected with the system protection pin (PRT) of PWM chip 5505; the other end is connected with thermosensitive circuit 5503 with resistance 5502; one end of thermosensitive circuit 5503 is connected with resistance 5502 with resistance 5506; the anodic bonding of the other end and diode 5501; one section of the anode of diode 5501 and thermosensitive circuit 5503 is connected, the negative electrode of diode 5501 with reference to ground (GND), be connected.
Connection when Fig. 6 shows system protection pin (PRT) in the pwm chip shown in Fig. 1 and 3-5 for system overheat protector.As shown in Figure 6, the system protection pin (PRT) of thermosensitive circuit 6,503 one termination pwm chips 6505, another termination is with reference to ground (GND).
Connection when Fig. 7 shows system protection pin (PRT) in the pwm chip shown in Fig. 1 and 3-5 for system overvoltage protection.As shown in Figure 7; the system protection pin (PRT) of resistance 7,502 one termination pwm chips 7505; one end of another termination Transformer Winding (auxiliary winding) 7201, one end of a terminating resistor 7502 of Transformer Winding 7201, another termination is with reference to ground (GND).
In the embodiment shown in fig. 1, overshoot absorbing circuit 7 is connected between 2 of A, B, drive circuit 8 is connected to the driving pin (GATE) of C(PWM control chip), between 2 of D, power supply circuits 6 are connected to the power supply input pin (VDD) of G(PWM control chip), between 2 of H.Fig. 8 shows the multiple connection of overshoot absorbing circuit 7.Fig. 9 shows the multiple connection of drive circuit 8.Figure 10 and 11 shows the multiple connection of power supply circuits 6.
The reverse exciting switching voltage regulator circuit that the utility model provides has the following advantages: conversion efficiency is high, stand-by power consumption is low, start-up time is short and cost is lower.
Below with reference to specific embodiment of the utility model, the utility model has been described, but those skilled in the art all understand, can carry out various modifications, combination and change to these specific embodiments, and can not depart from the spirit and scope of the present utility model that limited by claims or its equivalent.In addition, it is only exemplary that any signal arrows in accompanying drawing should be considered to, rather than restrictive, unless separately there is concrete indication.When term is also contemplated as when the ability of separation or combination is not known, the combination of assembly or step also will be considered to record.
Claims (8)
1. a reverse exciting switching voltage regulator circuit, comprises AC power input rectifying and electromagnetic interference filter circuit, flyback switching circuit, output filter circuit, feedback sample circuit, control circuit and power supply circuits, wherein:
The input of described AC power input rectifying and electromagnetic interference filter circuit is connected with AC power, and output is connected with the input of described flyback switching circuit and the input of described control circuit;
The input of described flyback switching circuit is connected with described AC power input rectifying and the output of electromagnetic interference filter circuit and the output of described control circuit, and output is connected with the input of the input of described output filter circuit, the input of described power supply circuits and described control circuit;
The input of described output filter circuit is connected with the output of described flyback switching circuit, and output is connected with the input of described feedback sample circuit;
The input of described feedback sample circuit is connected with the output of described output filter circuit, and output is connected with the input of described control circuit;
The input of described control circuit is connected with the output of described AC power input rectifying and electromagnetic interference filter circuit, the output of described flyback switching circuit, the output of described feedback sample circuit and the output of described power supply circuits, and output is connected with the input of described flyback switching circuit; And
The input of described power supply circuits is connected with the output of described flyback switching circuit, and output is connected with the input of described control circuit;
Wherein said control circuit comprises control chip, and described control chip comprises:
Drive pin, for driving the switching tube of described flyback switching circuit, be connected with the input of described flyback switching circuit;
Output feedback pin, for detection of the output voltage of described reverse exciting switching voltage regulator circuit, is connected with the output of described feedback sample circuit;
System protection pin, for providing system overheat protector and/or output over-voltage protection to described control chip;
Power supply input pin, is used to described control chip power supply, is connected with the output of described power supply circuits;
Current sample pin, for the primary current of the transformer of described flyback switching circuit is sampled, is connected with the output of described flyback switching circuit;
Chip grounding leg, as the reference ground of described control chip; And wherein
Described system protection pin is connected to the auxiliary winding of the flyback transformer in described flyback switching circuit via the first resistance, and is connected to reference to ground via diode and thermosensitive circuit.
2. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described system protection pin is connected to described the first resistance and described diode/thermosensitive circuit via the second resistance.
3. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described system protection pin is connected to the auxiliary winding of the flyback transformer in described flyback switching circuit via resistance.
4. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described system protection pin is connected to reference to ground via thermosensitive circuit.
5. reverse exciting switching voltage regulator circuit according to claim 1, it is characterized in that, described reverse exciting switching voltage regulator circuit also comprises drive circuit, and described drive circuit is connected between the described driving pin and the described switching tube in described flyback switching circuit of described control circuit.
6. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described reverse exciting switching voltage regulator circuit also comprises overshoot absorbing circuit, and described overshoot absorbing circuit is across the two ends of the primary coil of the flyback transformer in described flyback switching circuit.
7. reverse exciting switching voltage regulator circuit according to claim 6, is characterized in that, described output filter circuit also comprises one or more in π type filter circuit, common mode filtering circuit and RC absorbing circuit.
8. reverse exciting switching voltage regulator circuit according to claim 1, is characterized in that, described feedback sample circuit comprises parallel voltage-stabilizing integrated circuit, light lotus root, feedback resistance and feedback capacity.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320539993.0U CN203827205U (en) | 2013-08-30 | 2013-08-30 | Flyback switching power circuit |
| TW102219255U TWM471099U (en) | 2013-08-30 | 2013-10-16 | Flyback switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320539993.0U CN203827205U (en) | 2013-08-30 | 2013-08-30 | Flyback switching power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203827205U true CN203827205U (en) | 2014-09-10 |
Family
ID=50348513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320539993.0U Expired - Lifetime CN203827205U (en) | 2013-08-30 | 2013-08-30 | Flyback switching power circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN203827205U (en) |
| TW (1) | TWM471099U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017113601A1 (en) * | 2015-12-28 | 2017-07-06 | 深圳Tcl数字技术有限公司 | Zero power-consumption standby circuit and zero power-consumption standby television |
| CN108199590A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of high frequency switch power |
| CN108365765A (en) * | 2018-03-30 | 2018-08-03 | 上海理工大学 | A kind of multiple-channel output single-end flyback switching power supply |
| CN110492442A (en) * | 2019-07-25 | 2019-11-22 | 杭州洲钜电子科技有限公司 | A kind of ACDC protective circuit of switch power source and guard method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953837B (en) * | 2014-03-31 | 2018-05-08 | 台达电子企业管理（上海）有限公司 | Control device and control method and Switching Power Supply for power inverter |
-
2013
- 2013-08-30 CN CN201320539993.0U patent/CN203827205U/en not_active Expired - Lifetime
- 2013-10-16 TW TW102219255U patent/TWM471099U/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017113601A1 (en) * | 2015-12-28 | 2017-07-06 | 深圳Tcl数字技术有限公司 | Zero power-consumption standby circuit and zero power-consumption standby television |
| CN105611200B (en) * | 2015-12-28 | 2018-09-04 | 深圳Tcl数字技术有限公司 | Zero consumption standby circuit and Zero-power-consumption standby TV |
| CN108199590A (en) * | 2017-12-29 | 2018-06-22 | 河南北瑞电子科技有限公司 | A kind of high frequency switch power |
| CN108365765A (en) * | 2018-03-30 | 2018-08-03 | 上海理工大学 | A kind of multiple-channel output single-end flyback switching power supply |
| CN110492442A (en) * | 2019-07-25 | 2019-11-22 | 杭州洲钜电子科技有限公司 | A kind of ACDC protective circuit of switch power source and guard method |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM471099U (en) | 2014-01-21 |
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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 |
Granted publication date: 20140910 |
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| CX01 | Expiry of patent term |