CN216216535U - Small-size multi-output power supply - Google Patents
Small-size multi-output power supply Download PDFInfo
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- CN216216535U CN216216535U CN202122518288.XU CN202122518288U CN216216535U CN 216216535 U CN216216535 U CN 216216535U CN 202122518288 U CN202122518288 U CN 202122518288U CN 216216535 U CN216216535 U CN 216216535U
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Abstract
The application discloses a small-size multi-output power supply, which comprises an input unit, a multi-winding transformer, a rectifying and filtering unit and an energy storage output unit; the output end of the input unit is connected with the input end of the multi-winding transformer; the output end of the multi-winding transformer is connected with the input end of the rectifying and filtering unit; the output end of the rectification filtering unit is connected with the input end of the energy storage output unit; and the output end of the energy storage output unit is connected with an external circuit port. The method solves the technical problem that effective switching-on cannot be guaranteed when the primary equivalent capacitance of an upper bridge arm is large due to the fact that charging of a capacitor is influenced by the switching-on time of a lower bridge arm when the direct current brushless motor is driven by a driver in the prior art, and achieves the purposes of guaranteeing that energy of an output end is maintained at the moment of switching-on and guaranteeing effective switching-on.
Description
Technical Field
The application relates to the technical field of power electronic conversion, in particular to a small-size multi-output power supply.
Background
With the continuous development of industrial technology, the application of the dc brushless motor is more and more, the dc brushless motor must be driven by using a special driver, and a general driver uses N-mosfets as switching tubes in both upper and lower bridge arms, so that the driving of the upper bridge arm requires a special isolation power supply. The integrated circuit generally uses a bootstrap capacitor and a diode isolated circuit to store energy for the capacitor when the lower bridge arm is switched on, thereby ensuring the switching-on energy of the upper bridge arm. However, the charging of the capacitor is influenced by the switching-on time of the lower bridge arm, so that the effective switching-on cannot be ensured when the primary equivalent capacitance of the upper bridge arm is larger. The problem is particularly acute when using the new SIC-MOSFET. The method using the bootstrap capacitor cannot generate negative pressure, so that when the IGBT is used as an upper bridge arm switching tube and a lower bridge arm switching tube, the upper tube cannot be reliably turned off.
When an isolated power supply is used as a special driving power supply, due to the characteristics of the MOSFET, the very large electric energy release generated at the moment of switching on needs to be ensured, and the MOSFET is used for charging the input capacitor and the Miller platform capacitor so as to ensure the rapid switching on and reduce the switching-on loss. Therefore, the large current transmission capacity during the switching-on process needs to be ensured, and only voltage needs to be maintained after the switching-on process, and energy is basically not needed. Certain negative pressure needs to be provided within the upper pipe turn-off time, so that the upper pipe is reliably turned off.
At present, the integration level of a driver product is higher and higher, the size of the driver product is smaller and smaller, and as a component inside the driver, the size of the auxiliary power supply is also required to be small enough to meet the size requirement of the driver.
SUMMERY OF THE UTILITY MODEL
The small-size multi-output power supply at least solves the technical problem that effective switching-on cannot be guaranteed when the primary equivalent capacitance of an upper bridge arm is large due to the fact that charging of a capacitor is influenced by the switching-on time of a lower bridge arm when a direct current brushless motor is driven by a driver in the prior art, and achieves the purposes of guaranteeing that energy of an output end is maintained at the moment of switching-on and guaranteeing effective switching-on.
The small-size multi-output power supply comprises an input unit, a multi-winding transformer, a rectifying and filtering unit and an energy storage output unit; the output end of the input unit is connected with the input end of the multi-winding transformer; the output end of the multi-winding transformer is connected with the input end of the rectifying and filtering unit; the output end of the rectification filtering unit is connected with the input end of the energy storage output unit; and the output end of the energy storage output unit is connected with an external circuit port.
In one possible implementation, the input unit includes an input filtering unit and a power conversion unit; the input end of the input filtering unit is connected with a direct current input interface, and the output end of the input filtering unit is connected with the input end of the power conversion unit; and the output end of the power conversion unit is connected to the input end of the multi-winding transformer.
In one possible implementation, the multi-winding transformer includes one input winding and a plurality of output windings; the input winding is connected to the output end of the power conversion unit; the output windings are connected to the input end of the rectifying and filtering unit.
In one possible implementation, the rectifying and filtering unit includes a plurality of rectifying and filtering circuits corresponding to each of the output windings; the input ends of the plurality of rectifying and filtering circuits are respectively connected with the plurality of output windings; and the output ends of the plurality of rectifying and filtering circuits are connected with the input end of the energy storage output unit.
In one possible implementation manner, the energy storage output unit comprises a plurality of energy storage output circuits corresponding to each rectifying and filtering circuit; the input ends of the plurality of energy storage output circuits are respectively connected with the output ends of the plurality of rectifying and filtering circuits; and the output end of the energy storage output circuit is connected with an external circuit port.
In one possible implementation, the turn ratio between the input winding and each of the output windings is 1: 1.
in one possible implementation, each of the output windings has three output terminals, and the insulation levels of the windings are the same, and the insulation levels between the windings are the same.
In one possible implementation manner, one of the rectifying and filtering circuits is connected with one of the energy storage output circuits in common.
One or more technical solutions provided in the present application have at least the following technical effects or advantages:
the input unit, the multi-winding transformer, the rectifying and filtering unit and the energy storage output unit are adopted; connecting the output end of the input unit with an input winding of a multi-winding transformer; meanwhile, the output winding of the multi-winding transformer is connected with the input end of the rectifying and filtering unit, so that the single-path input of the input unit is converted into multi-path output and is input into the rectifying and filtering unit for processing; the output end of the rectifying and filtering unit is connected with the input end of the energy storage output unit, the output end of the energy storage output unit is connected with an external circuit port, energy storage processing is carried out on energy output by the rectifying and filtering unit through the energy storage output unit, and energy release maintenance is carried out at the moment of switching on.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments of the present invention or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a small-volume multi-output power supply according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of an input filter unit according to an embodiment of the present application;
fig. 3 is a circuit diagram of a power conversion unit according to an embodiment of the present application;
fig. 4 is a circuit diagram of a rectifying and filtering unit according to an embodiment of the present application;
fig. 5 is a circuit diagram of an energy storage output unit according to an embodiment of the present application.
Reference numerals: 1-an input unit; 11-an input filtering unit; 12-a power conversion unit; 2-a multi-winding transformer; 21-an input winding; 22-an output winding; 3, a rectifying and filtering unit; 4-energy storage output unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the embodiments of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.
Referring to fig. 1, a small-size multi-output power supply provided in an embodiment of the present application includes an input unit 1, a multi-winding transformer 2, a rectifying and filtering unit 3, and an energy storage output unit 4; the output end of the input unit 1 is connected with an input winding 21 of the multi-winding transformer 2; the output winding 22 of the multi-winding transformer 2 is connected with the input end of the rectifying and filtering unit 3; the output end of the rectification filter unit 3 is connected with the input end of the energy storage output unit 4; the output end of the energy storage output unit 4 is connected with an external circuit port.
Referring to fig. 1, 3 and 4, the multi-winding transformer 2 includes one input winding 21 and a plurality of output windings 22; the input winding 21 is connected to the output end of the power conversion unit 12; the plurality of output windings 22 are connected to the input terminals of the rectifying and filtering unit 3. The multi-winding transformer 2 in the embodiment of the application comprises a +15V input winding 21 and four + 15V-3V output windings 22.
Referring to fig. 1 to 3, the input unit 1 includes an input filtering unit 11 and a power converting unit 12; the input end of the input filter unit 11 is connected with a direct current input interface, and the output end of the input filter unit 11 is connected with the input end of the power conversion unit 12; the output of the power conversion unit 12 is connected to the input winding 21 of the multi-winding transformer 2. In the embodiment of the present application, the voltage of the dc input interface is 15V to 18V, the voltage of the input end of the power conversion unit 12 is 15V, and the voltage of the input winding 21 of the corresponding multi-winding transformer 2 is + 15V.
Referring to fig. 4, the rectifying-filtering unit 3 includes a plurality of rectifying-filtering circuits corresponding to each of the output windings 22; the input ends of the plurality of rectifying and filtering circuits are respectively connected to the plurality of output windings 22; the output ends of the plurality of rectifying and filtering circuits are connected with the input end of the energy storage output unit 4. In the embodiment of the present application, four rectifying and filtering circuits are selected, and the four output windings 22 are respectively connected to the input ends of the four rectifying and filtering circuits, wherein three groups of terminals in the output ends of the three rectifying and filtering circuits are respectively connected to U, V, W three-phase of the dc brushless motor, and one group of terminals in the output end of the remaining one rectifying and filtering circuit is connected to ground.
Referring to fig. 5, the tank output unit 4 includes a plurality of tank output circuits corresponding to each of the rectifying and smoothing circuits; the input ends of the plurality of energy storage output circuits are respectively connected with the output ends of the plurality of rectifying and filtering circuits; the output end of the energy storage output circuit is connected with the port of an external circuit. In the embodiment of the present application, the number of the energy storage output circuits is four, the input ends of the four energy storage output circuits are respectively connected to the output ends of the four rectification filter circuits, wherein three groups of terminals in the input ends of the three energy storage output circuits are respectively connected to U, V, W three phases of the dc brushless motor, and one group of terminals in the input end of the remaining one energy storage output circuit is connected to ground.
Referring to fig. 1, 3, and 4, the turn ratio between the input winding 21 and each of the output windings 22 is 1: 1. In the embodiment of the present application, the turn ratio between the input winding 21 and the four output windings 22 is 1: 1: 1: 1: 1, the inductance is 60 uH.
Referring to fig. 1, each of the output windings 22 has three output terminals, the winding insulation levels are the same, and the insulation levels between the windings are the same.
Referring to fig. 1, 4 and 5, one of the rectifying and filtering circuits is connected to the corresponding tank output circuit in common. In the embodiment of the application, one group of the outputs of the motor driver can be grounded with the preceding stage, and three lower pipes are used, so that the output of the motor driver is used as a main output, namely, the grounded energy storage output circuit in the energy storage output unit 4 is used as a main output, the sum of the power is consistent with that of the other three energy storage output circuits, and the other three energy storage output circuits are used in sequence, so that the other three energy storage output circuits are used as secondary outputs; because three paths of secondary outputs are floated on high voltage, the voltage isolation between windings is high, and the outputs of the paths do not interfere with each other. When a driver is used for driving the direct current brushless motor in the prior art, a method of using a bootstrap capacitor cannot generate negative pressure, so that when the IGBT is used as an upper bridge arm switching tube and a lower bridge arm switching tube, the upper tube cannot be reliably turned off. In the embodiment of the present application, the output winding 22 of the multi-winding transformer 2 is set to be +15V, -3V, so that the potentials input to the two ends of the input end of the rectifying and filtering circuit are +15V, -3V, taking the first rectifying and filtering circuit in the rectifying and filtering unit 3 as an example, the terminal in the middle of the output end of the rectifying and filtering circuit is connected to U of the dc brushless motor, the potential of the terminal is U, after the potential input to the input end of the rectifying and filtering circuit passes through the diode and the resistor in the rectifying and filtering circuit, the potentials at the two ends of the output end of the rectifying and filtering circuit are changed to be +12V-U, -3V-U, and finally the potentials at the output end after passing through the energy storage output unit 4 are +12V-U, -3V-U. Similarly, in the fourth rectifying and filtering circuit in the rectifying and filtering circuit, the terminal in the middle of the output end of the rectifying and filtering circuit is connected with the ground, after the potential input to the input end of the rectifying and filtering circuit passes through the diode and the resistor in the rectifying and filtering circuit, the potentials at the two ends of the output end of the rectifying and filtering circuit are changed into +12V and-3V, finally, the potential at the output end after passing through the energy storage output unit 4 is +12V and-3V, namely, the potential is used as a main output, and the other three paths are secondary outputs. Therefore, negative pressure can be generated in the embodiment of the application, and the upper pipe can be guaranteed to be reliably turned off.
The small-size multi-output power supply provided by the embodiment of the application innovatively uses a pre-stage and primary and secondary stage combined voltage stabilization technology, and simultaneously considers the unstable condition of the output power supply caused by the change of input and output loads; adopting a tank-type transformer, carefully selecting a magnetic material, and calculating a winding; because of the large energy requirement of the switch tube, each energy storage output circuit is connected with a large-capacity capacitor in parallel to ensure that the energy is maintained at the moment of switching on; in addition, the output capacitor of the power supply is optimized by carefully calculating the conduction energy of the switching tube, so that the instantaneous energy supply is ensured, and the volume of the energy storage capacitor of the power supply is reduced.
The small-size multi-output power supply provided by the embodiment of the application considers that only minimum energy is needed to ensure the maintenance voltage after the switching tube is conducted, so that the steady-state power consumption of the power supply is designed to be smaller in the embodiment of the application, the design optimization of a power transformer is facilitated, and finally the size of the power supply is further reduced. The multi-winding transformer 2 is wound by adopting insulated copper wires, the proportion of the copper wires in the magnetic core can be improved as much as possible on the premise of ensuring the insulation requirement, and in addition, the multi-winding transformer 2 adopts a mode of middle tapping, so that outgoing lines are reduced, and the manufacturing difficulty of the multi-winding transformer 2 is reduced; in the embodiment of the application, the structural design of two pcb boards is adopted, so that input and output are isolated, and the isolation strand and the anti-interference capability between input and output of a power supply are further improved; the structure that adopts two pcb boards centre clamps many windings transformer 2 in the embodiment of this application, with input and output circuit face-to-face relative arrangement, further reduced the power supply volume.
The power supply provided by the embodiment of the application is successfully applied to a 500V/50A direct current brushless motor driver; the resistance-capacitance element packaged by ultra-small volume is adopted, so that the occupied volume of the element is reduced; a double-sided pcb wiring process is adopted, so that the area of a pcb is reduced; the occupied area of the connector is reduced by adopting a pad wiring mode; the final product volume was reduced to 33 x 15.6 x 8 mm.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure.
Claims (8)
1. A small-size multi-output power supply is characterized by comprising an input unit (1), a multi-winding transformer (2), a rectifying and filtering unit (3) and an energy storage output unit (4);
the output end of the input unit (1) is connected with the input end of the multi-winding transformer (2);
the output end of the multi-winding transformer (2) is connected with the input end of the rectifying and filtering unit (3);
the output end of the rectification filtering unit (3) is connected with the input end of the energy storage output unit (4);
and the output end of the energy storage output unit (4) is connected with an external circuit port.
2. The small-volume multi-output power supply according to claim 1, wherein the input unit (1) includes an input filtering unit (11) and a power conversion unit (12);
the input end of the input filtering unit (11) is connected with a direct current input interface, and the output end of the input filtering unit (11) is connected with the input end of the power conversion unit (12);
the output end of the power conversion unit (12) is connected to the input end of the multi-winding transformer (2).
3. The small-volume multi-output power supply according to claim 2, wherein the multi-winding transformer (2) includes one input winding (21) and a plurality of output windings (22);
the input winding (21) is connected to the output end of the power conversion unit (12);
the output windings (22) are connected to the input end of the rectifying and filtering unit (3).
4. A small-volume multi-output power supply according to claim 3, wherein the rectifying-filtering unit (3) includes a plurality of rectifying-filtering circuits corresponding to each of the output windings (22);
the input ends of the plurality of rectifying and filtering circuits are respectively connected to the plurality of output windings (22);
and the output ends of the plurality of rectifying and filtering circuits are connected with the input end of the energy storage output unit (4).
5. A small-volume multi-output power supply according to claim 4, wherein the tank output unit (4) includes a plurality of tank output circuits corresponding to each of the rectifying and filtering circuits;
the input ends of the plurality of energy storage output circuits are respectively connected with the output ends of the plurality of rectifying and filtering circuits;
and the output end of the energy storage output circuit is connected with an external circuit port.
6. A small-volume multi-output power supply according to claim 3, wherein the turn ratio between the input winding (21) and each of the output windings (22) is 1: 1.
7. a small-volume multi-output power supply according to claim 3, wherein each of the output windings (22) has three output terminals, the winding insulation levels being the same, and the insulation levels between the windings being the same.
8. A small-volume multi-output power supply according to claim 5, wherein one of the rectifying-filtering circuits is connected in common with its corresponding one of the tank output circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122518288.XU CN216216535U (en) | 2021-10-20 | 2021-10-20 | Small-size multi-output power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122518288.XU CN216216535U (en) | 2021-10-20 | 2021-10-20 | Small-size multi-output power supply |
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| Publication Number | Publication Date |
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| CN216216535U true CN216216535U (en) | 2022-04-05 |
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| CN202122518288.XU Active CN216216535U (en) | 2021-10-20 | 2021-10-20 | Small-size multi-output power supply |
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