CN212343668U

CN212343668U - Low-cost high power density's double-circuit output line

Info

Publication number: CN212343668U
Application number: CN202021458842.9U
Authority: CN
Inventors: 朱辉; 刘跃武; 谭东超
Original assignee: Shenzhen Tianci Technology Co ltd
Current assignee: Shenzhen Tianci Technology Co ltd
Priority date: 2020-07-22
Filing date: 2020-07-22
Publication date: 2021-01-12
Anticipated expiration: 2030-07-22

Abstract

The utility model discloses a low-cost high power density's double-circuit output line, including DC direct voltage input, main power circuit, isolation transformer, pulse width modulation module, feedback module, sampling circuit and two way outputs, DC direct voltage input connection main power circuit, main power circuit still connect two way outputs through isolation transformer, and two way outputs all are connected with sampling circuit's input, the utility model discloses that the partly low voltage output's that loop has been shared to that loop with high voltage output. Therefore, the total number of turns of the coil is reduced, and the window area utilization coefficient of the main transformer can be improved so as to improve the window utilization rate of the transformer. Meanwhile, two independent circuits are not needed, so that a PWM driving IC and another feedback loop or another voltage reduction circuit can be saved.

Description

Low-cost high power density's double-circuit output line

Technical Field

The utility model relates to a power technical field specifically is a low-cost high power density's double-circuit output line.

Background

With the progress of the existing power electronic technology, the product characteristics of high efficiency, high density, low cost, high performance and small volume are increasingly required and valued by people. The equipment is a double-output power converter, and adopts a shared main transformer, and is directly designed into a double-output voltage line, so that the quantity of the used elements is minimized, the winding utilization of the window area of the transformer is improved as much as possible, the high utilization of the transformer is achieved, the cost of the product is reduced, the wiring space of the product is saved, and finally the miniaturization and high power density of the product are achieved.

Most of the dual-output switching power converters on the market at present generally adopt a two-group independent output circuit design or adopt one high-voltage output as a main output circuit (as shown in fig. 1), and when an independent two-output circuit is adopted, the main power, the isolation transformer, the pulse width modulation, the feedback loop and the sampling circuit all need independent elements, so that the cost is quite high. The layout occupies a much larger area of space. Is not favorable for miniaturization and low cost of products.

In addition, the other low-voltage output is realized through the two-way voltage reduction line (as shown in fig. 2), the single high-voltage output is adopted as the main output line, and when the other line is realized through the secondary voltage reduction, one isolation transformer is omitted compared with the first line, but the size of the isolation transformer used for the first line is certainly relatively large, and the space and the cost are saved as a whole. In addition, the two-stage step-down circuit has no independent two groups of complexity and many elements, but is not optimal for miniaturization and cost reduction of the product.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a low-cost high power density's double-circuit output line to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model provides a low-cost high power density's double-circuit output line, includes DC direct voltage input, main power circuit, isolation transformer, pulse width modulation module, feedback module, sampling circuit and two way outputs, DC direct voltage input connects the main power circuit, and the main power circuit still connects two way outputs through isolation transformer, and two way outputs all are connected with sampling circuit's input, and sampling circuit's output still connects the input of pulse width modulation module, and the main power circuit is still connected to pulse width modulation module's output.

As a further technical solution of the present invention: the isolation transformer comprises a transformer T, one of the two outputs comprises a diode D3, an inductor L1, a capacitor EC1 and a capacitor EC2, the other of the two outputs comprises a diode D2, an inductor L2, a capacitor EC3 and a capacitor EC4, the anode of a diode D3 is connected with a coil interface 9 of the transformer T, a coil interface 10 of the transformer T is connected with the anode of a diode D1 and a coil interface 7 of the transformer T, the cathode of a diode D3 is connected with the anode of an inductor L1, a capacitor EC1 and the cathode of a diode D4, the other end of the inductor L1 is connected with a capacitor EC2 and an output end Vo2, the anode of a diode D2 is connected with a coil interface 11 of the transformer T, a coil interface 12 of the transformer T is connected with the anode of a diode D2, the cathode of the diode D2 is connected with the cathodes of an inductor L2, a capacitor EC2 and a diode D2, the other end of the inductor L2 is connected with a capacitor EC2, The other end of the capacitor EC4, the coil interface 5 of the transformer T, the coil interface 8 of the transformer T and ground.

As a further technical solution of the present invention: diodes D1-D4 are all rectifier diodes.

As a further technical solution of the present invention: the capacitors EC1-EC4 are all filter capacitors.

As a further technical solution of the present invention: the inductor L2, the capacitor EC3 and the capacitor EC4 form a pi-type filter, and the inductor L1, the capacitor EC1 and the capacitor EC2 form a pi-type filter.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses that coil of low-voltage output has been shared with some of that coil of high-voltage output. Therefore, the total number of turns of the coil is reduced, and the window area utilization coefficient of the main transformer can be improved so as to improve the window utilization rate of the transformer. Meanwhile, two independent circuits are not needed, so that a PWM driving IC and another feedback loop or another voltage reduction circuit can be saved.

Drawings

FIG. 1 is a block diagram of prior art 1;

FIG. 2 is a block diagram of prior art 2;

fig. 3 is a block diagram of the present invention;

fig. 4 is a circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 3-4, example 1: the utility model provides a low-cost high power density's double-circuit output line, includes DC direct voltage input, main power circuit, isolation transformer, pulse width modulation module, feedback module, sampling circuit and two way outputs, DC direct voltage input connects the main power circuit, and the main power circuit still connects two way outputs through isolation transformer, and two way outputs all are connected with sampling circuit's input, and sampling circuit's output still connects the input of pulse width modulation module, and the main power circuit is still connected to pulse width modulation module's output.

The isolation transformer comprises a transformer T, one of the two outputs comprises a diode D3, an inductor L1, a capacitor EC1 and a capacitor EC2, the other of the two outputs comprises a diode D2, an inductor L2, a capacitor EC3 and a capacitor EC4, the anode of a diode D3 is connected with the coil interface 9 of the transformer T, the coil interface 10 of the transformer T is connected with the anode of a diode D1 and the coil interface 7 of the transformer T, the cathode of a diode D3 is connected with the anode of an inductor L1, a capacitor EC1 and the cathode of a diode D4, the other end of the inductor L1 is connected with a capacitor EC2 and an output end Vo2, the anode of a diode D2 is connected with the coil interface 11 of the transformer T, the coil interface 12 of the transformer T is connected with the anode of a diode D2, the cathode of the diode D2 is connected with the cathodes of an inductor L2, a capacitor EC2 and the cathode of a diode D2, the other end of the inductor L2 is connected with the capacitor EC2, The other end of the capacitor EC4, the coil interface 5 of the transformer T, the coil interface 8 of the transformer T and ground.

The number of the product elements of the scheme is greatly reduced compared with that of the product elements of the scheme shown in the figures 1 and 2, so that the space of the product layout can be greatly reduced, the advantage of the overall price cost is obvious, and a low-cost high-density double-output circuit is easier to realize.

In embodiment 2, based on embodiment 1, a specific circuit of the design is shown in fig. 4, wherein diodes D1-D4 are all rectifier diodes. The capacitors EC1-EC4 are all filter capacitors. The inductor L2, the capacitor EC3 and the capacitor EC4 form a pi-type filter, and the inductor L1, the capacitor EC1 and the capacitor EC2 form a pi-type filter. The coils used for outputting the voltage by the Vo1 are (T5-T6, T7-T8) and the coils used for outputting the voltage by the Vo2 are (T5-T6, T7-T8, T10-T9, T11-T12). the output of the Vo1 adopts a full-wave rectification line, and the output of the Vo2 adopts a full-wave rectification line. EC3, L2 and EC4 are pi-shaped filter circuits of the output Vo1 path, EC1, L1 and EC2 are pi-shaped filter circuits of the output Vo2, because a part of the output coil of the Vo2 (T5-T6, T7-T8, T10-T9 and T11-T12) shares the coil of the Vo1 (T5-T6 and T7-T8), the number of turns of the Vo1 (T5-T6 and T7-T8) is less than that of the output coil of the Vo2 which is directly wound, and the Vo1 line is needed to be relatively thicker, so that the complexity of the winding process of the transformer can be improved, and the space utilization rate of the transformer can be improved. Description of the current loop: with the dotted terminal positive, pin 7 of the T main transformer coil is positive through D1, through the n-filter circuit of EC3, L2 and EC4 to the positive output Vo1, and then from the negative (SGND) of Vo1 back to pin 8 of the main transformer. The coil 11 pin of the T main transformer is negative, and can not be cut off through D2 and D2. Pin 9 of the T main transformer coil is positive through D3, through the n-filter circuit of EC1, L1 and EC2 to the output Vo2 positive, and then from the negative (SGND) of Vo2 back to pin 8 of the main transformer. The coil 12 pin of the T main transformer is negative, and can not be cut off through D4 and D4. With the dotted terminal negative, pin 11 of the T main transformer coil is positive through D2, through the n-filter circuit of EC3, L2 and EC4 to the positive output Vo1, and then from the negative (SGND) of Vo1 back to pin 8 of the main transformer. The coil 7 pin of the T main transformer is negative, and can not be cut off through D1 and D1. The T main transformer coil 12 leg is positive through D4, through the pi filter circuit of EC1, L1 and EC2 to the output Vo2 positive, and then from the Vo2 negative (SGND) back to the main transformer 8 leg. The coil 12 pin of the T main transformer is negative, and can not be cut off through D3 and D3.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The utility model provides a low-cost high power density's double-circuit output line, includes DC direct voltage input, main power circuit, isolation transformer, pulse width modulation module, feedback module, sampling circuit and two way outputs, its characterized in that, DC direct voltage input connects the main power circuit, and the main power circuit still passes through isolation transformer and connects two way outputs, and two way outputs all are connected with sampling circuit's input, and sampling circuit's output still connects the input of pulse width modulation module, and the main power circuit is still connected to pulse width modulation module's output.

2. A low-cost high-power-density two-way output line as claimed in claim 1, wherein the isolation transformer comprises a transformer T, one of the two outputs comprises a diode D3, an inductor L1, a capacitor EC1 and a capacitor EC2, the other of the two outputs comprises a diode D2, an inductor L2, a capacitor EC3 and a capacitor EC4, the anode of the diode D3 is connected with the winding interface 9 of the transformer T, the winding interface 10 of the transformer T is connected with the anode of the diode D1 and the winding interface 7 of the transformer T, the cathode of the diode D3 is connected with the inductor L1, the capacitor EC1 and the cathode of the diode D4, the other end of the inductor L1 is connected with the capacitor EC2 and the output terminal 2, the anode of the diode D2 is connected with the winding interface 11 of the transformer T, the winding interface 12 of the transformer T is connected with the anode of the diode D4, the cathode of the diode D2 is connected with the inductor L2, the capacitor EC3 and the cathode, the other end of the inductor L2 is connected with the capacitor EC4 and the output end Vo1, and the other end of the capacitor EC1 is connected with the other end of the capacitor EC3, the other end of the capacitor EC4, the coil interface 5 of the transformer T, the coil interface 8 of the transformer T and the ground.

3. A low cost high power density dual output circuit as defined in claim 2 wherein diodes D1-D4 are all rectifier diodes.

4. A low cost high power density dual output circuit as defined in claim 2 wherein capacitors EC1-EC4 are all filter capacitors.

5. A low-cost high-power-density two-way output circuit according to claim 2, wherein the inductor L2, the capacitor EC3 and the capacitor EC4 form a pi-type filter, and the inductor L1, the capacitor EC1 and the capacitor EC2 form a pi-type filter.