CN213817591U - Novel multi-output direct-current switch power circuit - Google Patents
Novel multi-output direct-current switch power circuit Download PDFInfo
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- CN213817591U CN213817591U CN202023165938.9U CN202023165938U CN213817591U CN 213817591 U CN213817591 U CN 213817591U CN 202023165938 U CN202023165938 U CN 202023165938U CN 213817591 U CN213817591 U CN 213817591U
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Abstract
The utility model discloses a novel multiplexed output direct current switch power supply circuit, including controller, switch tube U1, transformer T1, freewheeling diode D1, filter capacitor C1, transformer T1 comprises primary winding Np, secondary winding Ns1 and secondary winding Ns 2; the two ends of the primary winding Np are respectively connected with the anode of the DC input end and the anode of the freewheeling diode D1; the negative electrode of the freewheeling diode D1 is connected with the negative electrode of the DC input end through the filter capacitor C1; two switch ends of the switch tube U1 are respectively connected with the anode of the freewheeling diode D1 and the cathode of the DC input end, and the control input end of the switch tube U1 is connected with the controller; the controller collects a feedback signal between the filter capacitor C1 and the freewheeling diode D1. The utility model discloses a 2 group secondary windings just can realize 3 way outputs, and the circuit is simple, small in size, and low cost is particularly suitable for designing the switching power supply application of miniwatt, multichannel isolation voltage output.
Description
Technical Field
The utility model relates to a switching power supply technical field especially relates to a novel multiplexed output direct current switch power supply circuit.
Background
With the rapid development of power supply technology in recent years, the size, frequency and integration of switching power supplies have been advanced. High efficiency switching power supplies have become increasingly widely used. However, the conventional flyback switching power supply has a complex structure and high cost.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a technical problem that will solve lies in, provides a novel multiplexed output direct current switch power supply circuit to simplify structure, reduce cost.
In order to solve the technical problem, an embodiment of the present invention provides a novel multi-output dc switch power supply circuit, including a controller, a switch tube U1, a transformer T1, a freewheeling diode D1, and a filter capacitor C1, where the transformer T1 is composed of a primary winding Np, a secondary winding Ns1, and a secondary winding Ns 2; the two ends of the primary winding Np are respectively connected with the anode of the DC input end and the anode of the freewheeling diode D1; the negative electrode of the freewheeling diode D1 is connected with the negative electrode of the DC input end through the filter capacitor C1; two switch ends of the switch tube U1 are respectively connected with the anode of the freewheeling diode D1 and the cathode of the DC input end, and the control input end of the switch tube U1 is connected with the controller; the controller collects a feedback signal between the filter capacitor C1 and the freewheeling diode D1 and controls the on/off of the switching tube U1 according to the feedback signal.
The high-voltage switch further comprises a filter capacitor C2, a filter capacitor C3, a secondary side rectifier diode D2 and a secondary side rectifier diode D3, wherein the secondary side rectifier diode D2 and the secondary side rectifier diode D3 are respectively connected with one end of the secondary winding Ns1 and one end of the secondary winding Ns2, two ends of the filter capacitor C2 are respectively connected with the other end of the secondary winding Ns1 and the negative electrode of the secondary side rectifier diode D2, and two ends of the filter capacitor C3 are respectively connected with the other end of the secondary winding Ns2 and the negative electrode of the secondary side rectifier diode D3.
The utility model has the advantages that: the utility model discloses a 2 group secondary windings just can realize 3 way outputs, and the circuit is simple, small in size, and low cost, and need not external devices such as opto-coupler, and the design is simpler, and efficiency is higher, is particularly suitable for designing the switching power supply application of miniwatt, multichannel isolation voltage output.
Drawings
Fig. 1 is a circuit diagram of a novel multi-output dc switch power circuit according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict, and the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
In the embodiment of the present invention, if there is directional indication (such as upper, lower, left, right, front, and rear … …) only for explaining the relative position relationship between the components and the motion situation under a certain posture (as shown in the drawing), if the certain posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the first, second, etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the novel multi-output dc switching power supply circuit according to the embodiment of the present invention includes a controller, a switching tube U1, a transformer T1, a freewheeling diode D1, and a filter capacitor C1.
The transformer T1 is composed of a primary winding Np, a secondary winding Ns1, and a secondary winding Ns 2. The two ends of the primary winding Np are respectively connected with the anode of the DC input end and the anode of the freewheeling diode D1. The negative electrode of the freewheeling diode D1 is connected with the negative electrode of the DC input end through the filter capacitor C1. The freewheeling diode D1 is a freewheeling diode of the BUCK circuit.
Two ends of a switch of the switch tube U1 are respectively connected with the anode of the freewheeling diode D1 and the cathode of the DC input end, and the control input end of the switch tube U1 is connected with the controller. The controller collects a voltage feedback signal between the filter capacitor C1 and the freewheeling diode D1 and controls the on/off of the switching tube U1 according to the feedback signal. Preferably, the switch tube U1 and the controller can be a two-in-one chip, which is low in cost. The utility model discloses only through 2 groups of secondary winding just realize 3 way outputs.
As an implementation manner, the novel multi-output dc switching power supply circuit further includes a filter capacitor C2, a filter capacitor C3, a secondary side rectifier diode D2, and a secondary side rectifier diode D3, wherein the secondary side rectifier diode D2 and the secondary side rectifier diode D3 are respectively connected to one end of the secondary winding Ns1 and one end of the secondary winding Ns2, two ends of the filter capacitor C2 are respectively connected to the other end of the secondary winding Ns1 and a negative electrode of the secondary side rectifier diode D2, and two ends of the filter capacitor C3 are respectively connected to the other end of the secondary winding Ns2 and a negative electrode of the secondary side rectifier diode D3.
As shown in fig. 1, the input voltage at the DC input terminal is Vin, the multiple output DC power voltages of the embodiment of the present invention are Vo1/Vo2/Vo3, wherein Vo1 is the output main feedback voltage, pin 1-2 is the primary winding Np of the transformer T1, pin 3-4 is the secondary winding Ns1 of the transformer T1, pin 5-6 is the secondary winding Ns2 of the transformer T1, and the black dots in the figure represent the end of the same name of the transformer T1. The forward voltage drop of the diode D1 is VD1, the forward voltage drop of the diode D2 is VD2, the forward voltage drop of the diode D3 is VD3, and the conduction duty ratio of the switching tube U1 is D.
When the U1 is switched on, the transformer acts as an inductor, the current flowing through the Np side rises linearly and reaches a peak value, energy is stored, and the freewheeling diode D1 and the rectifier diodes D2 and D3 are reversely biased to be switched off in the process; when the U1 is turned off, the current in the primary winding of the transformer T1 decreases, the freewheeling diode D1 is forward biased on, and the secondary rectifier diodes D2, D3 are also forward biased on, and the energy stored in the primary winding is transferred to the secondary winding to provide the load current.
From the volt-second equilibrium principle, we can obtain:
Vo1*D=(Vo1-Vin)*(1-D)；
the simplified formula can be: vo1= Vin/(1-D) (1)
The working principle of the transformer can be obtained as follows:
(Vo1+VD1-Vin)/Np=(Vo2+VD2)/Ns1 （2）
(Vo1+VD1-Vin)/Np=(Vo3+VD2)/Ns2 （3）
the following equations (1), (2) and (3) can be obtained:
Vo2=(Vo1+VD1-Vin)*Ns1/Np-VD2；
Vo3=(Vo1+VD1-Vin)*Ns2/Np-VD3；
according to the principle, the turn ratio of the primary side and the secondary side of the transformer is controlled to ensure each output voltage. The utility model discloses the circuit is simple reliable, and the suitability is strong.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A novel multi-output direct current switch power supply circuit is characterized by comprising a controller, a switch tube U1, a transformer T1, a freewheeling diode D1 and a filter capacitor C1, wherein the transformer T1 consists of a primary winding Np, a secondary winding Ns1 and a secondary winding Ns 2; the two ends of the primary winding Np are respectively connected with the anode of the DC input end and the anode of the freewheeling diode D1; the negative electrode of the freewheeling diode D1 is connected with the negative electrode of the DC input end through the filter capacitor C1; two switch ends of the switch tube U1 are respectively connected with the anode of the freewheeling diode D1 and the cathode of the DC input end, and the control input end of the switch tube U1 is connected with the controller; the controller collects a feedback signal between the filter capacitor C1 and the freewheeling diode D1 and controls the on/off of the switching tube U1 according to the feedback signal.
2. The novel multi-output direct-current switching power supply circuit as claimed in claim 1, further comprising a filter capacitor C2, a filter capacitor C3, a secondary side rectifier diode D2 and a secondary side rectifier diode D3, wherein the secondary side rectifier diode D2 and the secondary side rectifier diode D3 are respectively connected to one end of the secondary winding Ns1 and one end of the secondary winding Ns2, two ends of the filter capacitor C2 are respectively connected to the other end of the secondary winding Ns1 and the negative electrode of the secondary side rectifier diode D2, and two ends of the filter capacitor C3 are respectively connected to the other end of the secondary winding Ns2 and the negative electrode of the secondary side rectifier diode D3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023165938.9U CN213817591U (en) | 2020-12-24 | 2020-12-24 | Novel multi-output direct-current switch power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023165938.9U CN213817591U (en) | 2020-12-24 | 2020-12-24 | Novel multi-output direct-current switch power circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213817591U true CN213817591U (en) | 2021-07-27 |
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| CN202023165938.9U Active CN213817591U (en) | 2020-12-24 | 2020-12-24 | Novel multi-output direct-current switch power circuit |
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- 2020-12-24 CN CN202023165938.9U patent/CN213817591U/en active Active
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