CN205212710U - Dual output switching power supply circuit - Google Patents
Dual output switching power supply circuit Download PDFInfo
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- CN205212710U CN205212710U CN201521051185.5U CN201521051185U CN205212710U CN 205212710 U CN205212710 U CN 205212710U CN 201521051185 U CN201521051185 U CN 201521051185U CN 205212710 U CN205212710 U CN 205212710U
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- circuit
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- power supply
- switching power
- doubleway
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Abstract
The utility model discloses a dual output switching power supply circuit, including switching power supply primary side circuit, with switching power supply primary side circuit connection's transformer, the output of transformer has dual output, and wherein output has connected gradually first rectification filter circuit all the way, a DC output, and another way output has connected gradually second rectification filter circuit, the 2nd DC output, be connected with feedback circuit between second rectification filter circuit's output and the switching power supply primary side circuit, and this feedback circuit is connected with the compensating circuit who is used for adjusting output voltage. The utility model provides a dual output switching power supply circuit, its dual output's voltage stabilization is reliable to have good voltage output regulation, thereby guarantee well that electronic equipment uses safely reliably.
Description
Technical field
The utility model relates to a kind of switch power supply road technique, particularly relates to a kind of doubleway output switching power circuit.
Background technology
In the electronic equipment that various terminal equipments, communication equipment etc. that Switching Power Supply is widely used in taking as the leading factor with electronic computer with small-sized, light weight and high efficiency feature are nearly all, it is the indispensable a kind of power mode of current electronics and information industry develop rapidly.Switching Power Supply output cross regulation rate market relating to doubleway output is very poor, requiring that slightly high occasion all cannot normally use, conventionally design, not only circuit is complicated, workload is large, efficiency is low, and because of design time variable many, be difficult to accurate estimation, design result and actual conditions are differed greatly, also need repeatedly to revise.Therefore, a kind of simple circuit mode of market in urgent need, can provide the Switching Power Supply of good output cross regulation rate.
Utility model content
The purpose of this utility model is to provide the doubleway output switching power circuit that a kind of circuit structure is simple, output cross regulation rate is good.
The utility model is achieved through the following technical solutions: a kind of doubleway output switching power circuit, comprise primary terminal of switch power supply circuit, the transformer be connected with primary terminal of switch power supply circuit, the output of described transformer has doubleway output, wherein a road exports and is connected with the first current rectifying and wave filtering circuit in turn, first DC output end, another road exports and is connected with the second current rectifying and wave filtering circuit in turn, second DC output end, feedback circuit is connected with between the output of described second current rectifying and wave filtering circuit and primary terminal of switch power supply circuit, and this feedback circuit is connected with the compensating circuit for adjusting output voltage.Preferably, described first DC output end is not connected with the second DC output end altogether, the power output of the first DC output end is greater than the power output of the second DC output end, and the first DC output end is as the bypass output of high-power output, the main road output that the second DC output end exports as small-power.
Further, also protective circuit is connected with between the output of described second current rectifying and wave filtering circuit and primary terminal of switch power supply circuit.
Preferably, described feedback circuit is opto-coupled feedback circuit, and described compensating circuit is connected with the input of the optocoupler in this opto-coupled feedback circuit.
The doubleway output switching power circuit that the utility model provides, it can realize main road output is that small-power exports, when bypass output is high-power output, the voltage stabilization of its doubleway output is reliable, and there is good voltage and export regulation, ensure that it there will not be abnormal electrical power supply when powering, thus ensure that electronic equipments safety ground reliably uses well.
Accompanying drawing explanation
Fig. 1 is the circuit module block diagram of switching power circuit described in the utility model embodiment;
Fig. 2 is another circuit module block diagram of switching power circuit described in the utility model embodiment, in fig. 2, it depicts the partial function circuit module figure of described primary terminal of switch power supply circuit, in order to the annexation of the described feedback circuit of clear display, protective circuit and described primary terminal of switch power supply circuit;
Fig. 3 is the physical circuit figure of feedback circuit described in the utility model embodiment, and shows the concrete annexation with compensating circuit.
Embodiment
For the ease of the understanding of those skilled in the art, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, a kind of doubleway output switching power circuit, comprise primary terminal of switch power supply circuit, the transformer be connected with primary terminal of switch power supply circuit, the output of described transformer has doubleway output, wherein a road exports and is connected with the first current rectifying and wave filtering circuit in turn, first DC output end, another road exports and is connected with the second current rectifying and wave filtering circuit in turn, second DC output end, feedback circuit is connected with between the output of described second current rectifying and wave filtering circuit and primary terminal of switch power supply circuit, and this feedback circuit is connected with the compensating circuit for adjusting output voltage.Further, also protective circuit is connected with between the output of described second current rectifying and wave filtering circuit and primary terminal of switch power supply circuit.
In the present embodiment, the compensating circuit that described compensating circuit can be made up of electric capacity, resistance (comprising adjustable resistance), for adjusting the output voltage of described doubleway output switching power circuit, the voltage improving Switching Power Supply exports regulation, makes the voltage stabilization of its doubleway output reliable.Compensating circuit in the present embodiment is that prior art can be formed and the functional circuit realized, and is no longer described in detail at this.Certainly, described compensating circuit also can be that IC forms for carrying out voltage, current compensation and reaching carries out adjusting the functional circuit of output voltage.
Described primary terminal of switch power supply circuit has switching circuit and pwm control circuit; described switching circuit is all connected with transformer, pwm control circuit; the output of described second current rectifying and wave filtering circuit is connected with described pwm control circuit respectively by feedback circuit, protective circuit, as shown in Figure 2.In primary terminal of switch power supply circuit, it generally includes primary rectifier filter circuit, filter circuit, switching circuit, pwm control circuit etc., and each functional module in primary terminal of switch power supply circuit and annexation thereof are prior art, are not described in detail in this.In fig 2, it only draws switching circuit in primary terminal of switch power supply circuit and pwm control circuit, and other the functional circuit in primary terminal of switch power supply circuit all omits.
In the present embodiment, described first DC output end is not connected with the second DC output end altogether, the power output of the first DC output end is greater than the power output of the second DC output end, and the first DC output end is as the bypass output of high-power output, the main road output that the second DC output end exports as small-power.Pwm control circuit in the utility model is controlled by protective circuit and feedback circuit; when there is larger fluctuation or be abnormal in output voltage; when pwm control circuit receives the anomaly detection signal of protective circuit and feedback circuit; feedback signal can be transmitted fast to control switching circuit, thus ensure that the voltage output of the DC output end neither altogether connected does not occur larger fluctuation.
In the present embodiment, described feedback circuit is preferably opto-coupled feedback circuit, and as shown in Figure 3, described compensating circuit is connected with the input of the optocoupler in this opto-coupled feedback circuit the physical circuit composition of this opto-coupled feedback circuit; Preferably, described compensating circuit is be connected with the negative electrode of the light-emitting diode of the input of optocoupler, as shown in Figure 3.
Doubleway output switching power circuit in the present embodiment, it has doubleway output: as bypass output and the main road output exported as small-power of high-power output, two outputs do not connect altogether, and pass through the fit applications of opto-coupled feedback circuit and compensating circuit, make the voltage stabilization of its doubleway output reliable, and there is good voltage and export regulation, thus ensure that electronic equipments safety ground reliably uses well.
Above-described embodiment is preferably implementation of the present utility model, is not to restriction of the present utility model, and under the prerequisite not departing from inventive concept of the present utility model, any apparent replacement is all within protection range of the present utility model.
Claims (6)
1. a doubleway output switching power circuit, comprise primary terminal of switch power supply circuit, the transformer be connected with primary terminal of switch power supply circuit, it is characterized in that: the output of described transformer has doubleway output, wherein a road exports and is connected with the first current rectifying and wave filtering circuit in turn, first DC output end, another road exports and is connected with the second current rectifying and wave filtering circuit in turn, second DC output end, feedback circuit is connected with between the output of described second current rectifying and wave filtering circuit and primary terminal of switch power supply circuit, and this feedback circuit is connected with the compensating circuit for adjusting output voltage.
2. doubleway output switching power circuit according to claim 1, is characterized in that: be also connected with protective circuit between the output of described second current rectifying and wave filtering circuit and primary terminal of switch power supply circuit.
3. doubleway output switching power circuit according to claim 2, is characterized in that: described feedback circuit is opto-coupled feedback circuit, and described compensating circuit is connected with the input of the optocoupler in this opto-coupled feedback circuit.
4. doubleway output switching power circuit according to claim 3, is characterized in that: the power output of described first DC output end is greater than the power output of the second DC output end.
5. doubleway output switching power circuit according to claim 2; it is characterized in that: described primary terminal of switch power supply circuit has switching circuit and pwm control circuit; described switching circuit is all connected with transformer, pwm control circuit, and the output of described second current rectifying and wave filtering circuit is connected with described pwm control circuit respectively by feedback circuit, protective circuit.
6. the doubleway output switching power circuit according to any one of Claims 1 to 5, is characterized in that: described first DC output end is not connected with the second DC output end altogether.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521051185.5U CN205212710U (en) | 2015-12-16 | 2015-12-16 | Dual output switching power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521051185.5U CN205212710U (en) | 2015-12-16 | 2015-12-16 | Dual output switching power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205212710U true CN205212710U (en) | 2016-05-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521051185.5U Expired - Fee Related CN205212710U (en) | 2015-12-16 | 2015-12-16 | Dual output switching power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205212710U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727564A (en) * | 2019-03-07 | 2019-05-07 | 青岛海信电器股份有限公司 | Display device and Zenith tracking method |
-
2015
- 2015-12-16 CN CN201521051185.5U patent/CN205212710U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109727564A (en) * | 2019-03-07 | 2019-05-07 | 青岛海信电器股份有限公司 | Display device and Zenith tracking method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20160504 Termination date: 20181216 |