CN204578369U - Inverse-excitation type switch power-supply circuit - Google Patents
Inverse-excitation type switch power-supply circuit Download PDFInfo
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- CN204578369U CN204578369U CN201320292509.9U CN201320292509U CN204578369U CN 204578369 U CN204578369 U CN 204578369U CN 201320292509 U CN201320292509 U CN 201320292509U CN 204578369 U CN204578369 U CN 204578369U
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Abstract
Disclose a kind of inverse-excitation type switch power-supply circuit.The output of ac rectifier is connected with the input of electromagnetic interference filter circuit; The input of electromagnetic interference filter circuit is connected with the output of ac rectifier, and output is connected with the input of start-up circuit; The input of start-up circuit is connected with the output of electromagnetic interference circuit, and output is connected with the input of flyback switching circuit and control circuit; The input of flyback switching circuit is connected with the output of start-up circuit and control circuit, and output is connected with the input of feedback circuit, output rectifier and filter and control circuit; The input of output rectifier and filter is connected with the output of flyback switching circuit; The input of control circuit is connected with the output of start-up circuit, flyback switching circuit and feedback circuit, and output is connected with the input of flyback switching circuit; The input of feedback circuit is connected with the output of flyback switching circuit, and output is connected with the input of control circuit.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of inverse-excitation type switch power-supply circuit.
Background technology
Global energy day is becoming tight, and energy-saving and emission-reduction, green energy resource become the Developing Tendency formula of energy field.Relevant Energy Efficiency Standard is more and more stricter, and six grades of new efficiencies propose the standby requirement of 75 milliwatts (mW).The famous cell phone manufacturer such as Samsung, LG, Nokia is proposed stricter standby classifying system jointly, and the charger wherein only having stand-by power consumption to be less than 30mW is decided to be five-star charger.Therefore, adopt lower cost solution to realize low standby power loss, become the competitive advantage of power management chip manufacturer.
Utility model content
Problem in view of the above, the utility model proposes a kind of inverse-excitation type switch power-supply circuit of novelty.
According to a kind of inverse-excitation type switch power-supply circuit of the present utility model, comprise ac rectifier, electromagnetic interference filter circuit, start-up circuit, flyback switching circuit, output rectifier and filter, control circuit and feedback circuit.Wherein, the input of ac rectifier is connected with AC power, and output is connected with the input of electromagnetic interference filter circuit; The input of electromagnetic interference filter circuit is connected with the output of ac rectifier, and output is connected with the input of start-up circuit; The input of start-up circuit is connected with the output of electromagnetic interference circuit, and output is connected with the input of control circuit with the input of flyback switching circuit; The input of flyback switching circuit is connected with the output of control circuit with the output of start-up circuit, and output is connected with the input of the input of feedback circuit, the input of output rectifier and filter and control circuit; The input of output rectifier and filter is connected with the output of flyback switching circuit, and output is connected with load; The input of control circuit is connected with the output of start-up circuit, the output of flyback switching circuit and the output of feedback circuit, and output is connected with the input of flyback switching circuit; The input of feedback circuit is connected with the output of flyback switching circuit, and output is connected with the input of control circuit.
According to inverse-excitation type switch power-supply circuit of the present utility model relative to existing power circuit, peripheral component is few, cost is low and stand-by power consumption is low.In addition, according in inverse-excitation type switch power-supply circuit of the present utility model, low current can be realized and start and low current operating characteristic, reduction system standby power consumption, meet the requirement of the newest standards such as the stand-by power consumption of five-star charger and Energy Star.
Accompanying drawing explanation
The utility model can be understood better in the description of embodiment of the present utility model below in conjunction with accompanying drawing, wherein:
Fig. 1 shows the block diagram of the inverse-excitation type switch power-supply circuit according to the utility model embodiment;
Fig. 2 shows the circuit diagram of the inverse-excitation type switch power-supply circuit according to the utility model embodiment;
Fig. 3 shows the multiple connection of electromagnetic interference (EMI) filter circuit;
Fig. 4 shows the multiple connection of absorbing circuit; And
Fig. 5 shows two kinds of connections of output rectifier and filter.
Embodiment
The characteristic sum exemplary embodiment of the utility model various aspects will be described in detail below.Description below covers many details, 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 implemented when not needing some details in these details.Below the description of embodiment is only used to by illustrating example of the present utility model to provide to the clearer understanding of the utility model.Any concrete configuration that the utility model proposes below being never limited to, but under the prerequisite not departing from spirit of the present utility model, cover any amendment of coherent element or parts, replacement and improvement.
The utility model proposes a kind of inverse-excitation type switch power-supply circuit of novelty.Fig. 1 shows the block diagram of the inverse-excitation type switch power-supply circuit according to the utility model embodiment.As shown in Figure 1, ac rectifier 1, electromagnetic interference (EMI) filter circuit 2, start-up circuit 3, flyback switching circuit 5, output rectifier and filter 6, feedback circuit 7 and control circuit 8 is comprised according to the inverse-excitation type switch power-supply circuit of the utility model embodiment.
Wherein, the input of ac rectifier 1 is connected with AC power, and output is connected with the input of electromagnetic interference filter circuit 2; The input of electromagnetic interference filter circuit 2 is connected with the output of ac rectifier 1, and output is connected with the input of start-up circuit 3; The input of start-up circuit 3 is connected with the output of electromagnetic interference circuit 2, and output is connected with the input of control circuit 8 with the input of flyback switching circuit 5; The input of flyback switching circuit 5 is connected with the output of control circuit 8 with the output of start-up circuit 3, and output is connected with the input of the input of feedback circuit 7, the input of output rectifier and filter 6 and control circuit 8; The input of output rectifier and filter 6 is connected with the output of flyback switching circuit 5, and output is connected with load; The input of control circuit 8 is connected with the output of the output of start-up circuit 3, flyback switching circuit 5 and the output of feedback circuit 7, and output is connected with the input of flyback switching circuit 5; The input of feedback circuit 7 is connected with the output of flyback switching circuit 5, and output is connected with the input of control circuit 8.Flyback switching circuit 5 can comprise the absorbing circuit 4 at the two ends of the armature winding across the flyback transformer in flyback switching circuit 5 further.
Fig. 2 shows the circuit diagram of the inverse-excitation type switch power-supply circuit according to the utility model embodiment.Referring to Fig. 2, the circuit describing ac rectifier 1, electromagnetic interference (EMI) filter circuit 2, start-up circuit 3, absorbing circuit 4, flyback switching circuit 5, output rectifier and filter 6, feedback circuit 7 and the control circuit 8 comprised according to the inverse-excitation type switch power-supply circuit of the utility model embodiment in detail is formed and effect.
In the embodiment shown in Figure 2, ac rectifier 1 comprises fuse (FUSE) and rectifier diode D1-D4, and its Main Function carries out rectification to alternating voltage.Wherein, the minimum number of the rectifier diode that ac rectifier 1 comprises can be one, can be at most eight.The fuse that ac rectifier 1 comprises can replace with fuse resistance, wire resistor or inductance.
In the embodiment shown in Figure 2, EMI filter circuit 2 comprises inductance L 1 and L2, high-voltage electrolytic capacitor C1 and C2 and Electrostatic Discharge resistance R1, and its Main Function suppresses EMI and rectification post filtering.According to different application, EMI filter circuit can comprise one or two inductance, also can only include a common mode inductance (while comprising one or more high-voltage electrolytic capacitor); A high-voltage electrolytic capacitor (while comprising one or two inductance or a common mode inductance) can be only included; And esd discharge resistance R1 can not be comprised in some occasion.Fig. 3 shows the multiple connection of EMI filter circuit, and wherein R1 is esd discharge resistance, its can serial or parallel connection to reach required resistance, also can cancel.
In the embodiment shown in Figure 2, the Main Function of start-up circuit 3 provides starting current by starting resistance R2, R3, this starting current is after the switching tube Q1 in flyback switching circuit 5 amplifies, enter the PIN-D of control circuit 8, charge to the power supply electric capacity C4 of start-up circuit 3 through the PIN-F of control circuit 8 again, reach the object starting control circuit 8.Starting resistance can the large resistance of selection and comparison, realizes low current and starts, reduce the power loss of start-up circuit, reduce 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 be able to fully phase out according to different market demands, thus reduces costs further.Fig. 4 shows the multiple connection of absorbing circuit.As can be seen from Figure 2, absorbing circuit 4 is across the two ends of the armature winding of the switching tube Q1 in flyback switching circuit 5.
In the embodiment shown in Figure 2, flyback switching circuit 5 comprises flyback transformer T1, switching tube Q1 and current sense resistor Rs, and its Main Function converts the high-voltage dc voltage after AC rectification to lower alternating voltage by flyback transformer T1.Current sense resistor Rs can reach required resistance in the mode of serial or parallel connection.
In the embodiment shown in Figure 2, output rectifier and filter 6 comprises output rectifier diode D4 and filter capacitor Co two major parts.For different output ripple requirements, output rectifier and filter 6 can increase π type filter circuit or common mode filtering circuit to improve filter effect.Fig. 5 shows two kinds of connections of output rectifier and filter, to reach different ripple requirements.
In the embodiment shown in Figure 2, feedback circuit 7 comprises sample resistance R5 and R6, and its Main Function is that the secondary alternating voltage (alternating voltage on feedback winding) utilizing sample resistance to be induced in proportion by the primary supplies winding by flyback transformer T1 delivers to control circuit 8.There is no optocoupler and secondary benchmark pressurizer from principle, thus significantly reduce cost.Sample resistance can reach required resistance in the mode of serial or parallel connection.
In the embodiment shown in Figure 2, the main devices of control circuit 8 is pulse width modulation (PWM) control chips.Wherein, this control chip can be such as, the control chip of OB2550 or similar functions, and this chip comprises following 6 function pin altogether:
Feedback signal pin (PIN-A): for detecting the output voltage of flyback switching circuit 5, be connected with the output of feedback circuit 7;
Grounding leg (PIN-B): for ground connection;
Current detecting pin (PIN-C): for detecting the primary current of flyback switching circuit 5, and provide the shutoff for the switching tube Q1 in flyback switching circuit 5 to control according to the electric current detected, the switching tube Q1 in flyback switching circuit 5 is connected to by the PIN-D of control circuit 8;
Switch controlled pin (PIN-D): be connected with the switching tube Q1 in flyback switching circuit 5, the emitter for control switch pipe Q1 is opened and shutoff;
Drive pin (PIN-E): be connected with the output of start-up circuit 3, the input of flyback switching circuit 5;
Power supply pin (PIN-F): for providing operating voltage for this chip, be connected with the output of start-up circuit 3.
According in inverse-excitation type switch power-supply circuit of the present utility model, larger starting resistance is used, thus achieve low current and start and low current operating characteristic, reduce system standby power consumption, meet the requirement of the newest standards such as the stand-by power consumption of five-star charger and Energy Star.That is, overcome current technical bottleneck according to inverse-excitation type switch power-supply circuit of the present utility model, and few relative to peripheral component existing power circuit, cost is low and stand-by power consumption is low.
Below the utility model is described with reference to specific embodiment of the utility model, but those skilled in the art all understand, various amendment, combination and change can be carried out to these specific embodiments, and the spirit and scope of the present utility model by claim or its equivalents can not be departed from.
Claims (8)
1. an inverse-excitation type switch power-supply circuit, comprises ac rectifier, electromagnetic interference filter circuit, start-up circuit, flyback switching circuit, output rectifier and filter, control circuit and feedback circuit, wherein:
The input of ac rectifier is connected with AC power, and output is connected with the input of electromagnetic interference filter circuit;
The input of electromagnetic interference filter circuit is connected with the output of ac rectifier, and output is connected with the input of start-up circuit;
The input of start-up circuit is connected with the output of electromagnetic interference circuit, and output is connected with the input of control circuit with the input of flyback switching circuit;
The input of flyback switching circuit is connected with the output of control circuit with the output of start-up circuit, and output is connected with the input of the input of feedback circuit, the input of output rectifier and filter and control circuit;
The input of output rectifier and filter is connected with the output of flyback switching circuit, and output is connected with load;
The input of control circuit is connected with the output of start-up circuit, the output of flyback switching circuit and the output of feedback circuit, and output is connected with the input of flyback switching circuit;
The input of feedback circuit is connected with the output of flyback switching circuit, and output is connected with the input of control circuit; Wherein
Flyback switching circuit comprises flyback transformer, switching tube and current sense resistor, and control circuit comprises pulse width modulation control chip, and this pulse width modulation control chip comprises:
Feedback signal pin, for detecting the output voltage of flyback switching circuit, is connected with the output of feedback circuit;
Grounding leg, for ground connection;
Drive pin, be connected with the output of start-up circuit, the input of flyback switching circuit;
Current detecting pin, for detecting the primary current of flyback switching circuit, and providing the shutoff for the switching tube in flyback switching circuit to control according to the electric current detected, being connected to the switching tube in flyback switching circuit by switch controlled pin;
Switch controlled pin, is connected with the switching tube in flyback switching circuit, and the emitter for controlling the switching tube in flyback switching circuit is opened and shutoff;
Power supply pin, for providing operating voltage for this pulse width modulation control chip, is connected with the output of start-up circuit; And
The starting current that start-up circuit provides, after the switching tube in flyback switching circuit amplifies, enters the switch controlled pin of control circuit, then via the power supply pin of control circuit to the power supply capacitor charging of start-up circuit, thus start control circuit.
2. inverse-excitation type switch power-supply circuit according to claim 1, is characterized in that, flyback switching circuit also comprises the absorbing circuit across the armature winding two ends at flyback transformer.
3. inverse-excitation type switch power-supply circuit according to claim 1, is characterized in that, output rectifier and filter comprises output rectifier diode and filter capacitor.
4. inverse-excitation type switch power-supply circuit according to claim 3, is characterized in that, output rectifier and filter also comprises π type filter circuit and/or common mode filtering circuit.
5. inverse-excitation type switch power-supply circuit according to claim 1, is characterized in that, feedback circuit is made up of sample resistance.
6. inverse-excitation type switch power-supply circuit according to claim 1, is characterized in that, start-up circuit comprises starting resistance, and provides starting current by starting resistance.
7. inverse-excitation type switch power-supply circuit according to claim 1, is characterized in that, electromagnetic interference filter circuit comprises inductance and high-voltage electrolytic capacitor.
8. inverse-excitation type switch power-supply circuit according to claim 7, is characterized in that, electromagnetic interference filter circuit also comprises static discharge resistance.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320292509.9U CN204578369U (en) | 2013-05-24 | 2013-05-24 | Inverse-excitation type switch power-supply circuit |
| TW102212781U TWM466425U (en) | 2013-05-24 | 2013-07-05 | Reverse-exciting type switch power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320292509.9U CN204578369U (en) | 2013-05-24 | 2013-05-24 | Inverse-excitation type switch power-supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204578369U true CN204578369U (en) | 2015-08-19 |
Family
ID=49993241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320292509.9U Expired - Lifetime CN204578369U (en) | 2013-05-24 | 2013-05-24 | Inverse-excitation type switch power-supply circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN204578369U (en) |
| TW (1) | TWM466425U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980917A (en) * | 2017-12-27 | 2019-07-05 | 中国科学院声学研究所 | A kind of power supply unit suitable for seabed observation network constant pressure repeater or splitter |
-
2013
- 2013-05-24 CN CN201320292509.9U patent/CN204578369U/en not_active Expired - Lifetime
- 2013-07-05 TW TW102212781U patent/TWM466425U/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980917A (en) * | 2017-12-27 | 2019-07-05 | 中国科学院声学研究所 | A kind of power supply unit suitable for seabed observation network constant pressure repeater or splitter |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM466425U (en) | 2013-11-21 |
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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: 20150819 |
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| CX01 | Expiry of patent term |