CN203967982U

CN203967982U - The integrated high-isolation power module of low pressure

Info

Publication number: CN203967982U
Application number: CN201420347961.5U
Authority: CN
Inventors: 张云鹏
Original assignee: Aerospace Changfeng Chaoyang Power Supply Co Ltd
Current assignee: Aerospace Changfeng Chaoyang Power Supply Co Ltd
Priority date: 2014-06-27
Filing date: 2014-06-27
Publication date: 2014-11-26
Anticipated expiration: 2024-06-27

Abstract

The utility model discloses the integrated high-isolation power module of a kind of low pressure, comprise transformer, optocoupler and control circuit board; The integrated high-isolation power module of low pressure adopts single-ended reverse exciting circuit, the withstand voltage circular ring type transformer of the high isolation of transformer adopting; Optocoupler is H11A817C, and its isolation is withstand voltage is AC3000V; The integrated high-isolation power module of low pressure adopts surrounding to have the aluminum alloy casing of radiating groove, power component is welded on control circuit board, ceramic substrate is the hot link body of power component and aluminum alloy casing inner tip, and control circuit board outer is not less than 5mm apart from aluminum alloy casing medial surface; Heat-conducting silicon rubber entity embedding for aluminum alloy casing remaining space inside.Internal power of the present utility model loop, shell, control circuit integrated design, ensure that it is simple in structure, good reliability, isolates withstand voltage height, wide accommodation.

Description

The integrated high-isolation power module of low pressure

Technical field

The utility model relates to a kind of power module, specifically, relates to the integrated high-isolation power module of a kind of low pressure.

Background technology

At present, the withstand voltage DC500V that is generally of isolation of the isolated low voltage DC/DC of standard converter, the isolation of the general isolated DC/DC converter of part is withstand voltage is DC1000V, traditional low-tension supply module is in 50W situation at power, transformer is for example generally selected, into flat surface transformer: the flat surface transformers such as P14-8, EE18 and PQ20.It is little that flat surface transformer is subject to volume, and the window area of transformer self is little, is relatively applicable to doing low isolation Anti-voltage transformer.But under Special use environmental condition, need the nonstandardized technique product that integrated level and isolation are higher, as in the railway system and in mine down-hole system, just need the integrated high-isolation power module of low pressure, its isolation requirement of withstand voltage reaches AC2000V.

Utility model content

The utility model just for solving the problems of the technologies described above the integrated high-isolation power module of a kind of low pressure designing.

The utility model solves the technical scheme that its technical problem adopts:

The integrated high-isolation power module of a kind of low pressure, comprises transformer, optocoupler and control circuit board; The integrated high-isolation power module of its low pressure adopts single-ended reverse exciting circuit, transformer adopting circular ring type transformer, and its coiling order be elementary-compole-secondary, winds the line and all adopts high enamel insulated wire, magnet wire insulation intensity is not less than AC7500V; Between primary winding and auxiliary winding, carry out 1 layer of insulation processing coiling with individual layer Kapton Tape, its individual layer Kapton Tape dielectric strength is not less than AC6000V; Between the auxiliary winding of transformer T and winding, carry out 2 layers of insulation processing coilings with individual layer Kapton Tape, its double-deck Kapton Tape dielectric strength is not less than AC12000V; Be fixed with silicon rubber at coiling position, crossing; Optocoupler is H11A817C, and its isolation is withstand voltage is AC3000V; The integrated high-isolation power module of low pressure adopts surrounding to have the aluminum alloy casing of radiating groove, power component is welded on control circuit board, ceramic substrate is the hot link body of power component and aluminum alloy casing inner tip, and control circuit board outer is not less than 5mm apart from aluminum alloy casing medial surface; Heat-conducting silicon rubber entity embedding for aluminum alloy casing remaining space inside.

The integrated high-isolation power module of described low pressure, adopts ceramic substrate isolation between its input and output pin.

The utility model power module internal power loop, shell, control circuit integrated design, ensure that it is simple in structure, and reliability is high, meets the requirement of power module high-isolation.

The utlity model has following feature:

1, between input and output, isolating withstand voltage is AC2000V, and leakage current is less than 5 milliamperes;

2, internal power loop, shell, control circuit integrated design, ensures that it is simple in structure, and reliability is high; Adopt silicon rubber entity package, meet high isolation design requirement;

3,, with installing hole and fin, adopt natural heat dissipation and two kinds of modes of heat loss through conduction, without additional cooling measure;

4, can adapt to the parameter requests such as most of input voltage, output voltage and power, adaptability is wider; The input of described power module and output isolation, isolating withstand voltage is AC2000V, leakage current is less than 5 milliamperes, input voltage covers DC9-DC36V, output voltage covers DC5-DC24V(single channel), voltage accuracy for being not more than ± 1%.

The beneficial effects of the utility model are the integrated high-isolation power module internal power of low pressure loop, shell, control circuit integrated design, ensure that it is simple in structure, good reliability, isolate withstand voltage height, wide accommodation.

Brief description of the drawings

Fig. 1 is the integrated high-isolation power module structure of the utility model low pressure schematic diagram.

Fig. 2 is the utility model voltage stabilizing circuit schematic diagram used.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

As depicted in figs. 1 and 2, the integrated high-isolation power module of a kind of low pressure of the utility model, comprises transformer, optocoupler and control circuit board; The integrated high-isolation power module of its low pressure adopts single-ended reverse exciting circuit, transformer adopting circular ring type transformer, and its coiling order be elementary-compole-secondary, winds the line and all adopts high enamel insulated wire, magnet wire insulation intensity is not less than AC7500V; Between primary winding and auxiliary winding, carry out 1 layer of insulation processing coiling with individual layer Kapton Tape, its individual layer Kapton Tape dielectric strength is not less than AC6000V; Between the auxiliary winding of transformer T and winding, carry out 2 layers of insulation processing coilings with individual layer Kapton Tape, its double-deck Kapton Tape dielectric strength is not less than AC12000V; Be fixed with silicon rubber at coiling position, crossing; Optocoupler is H11A817C, and its isolation is withstand voltage is AC3000V; The integrated high-isolation power module of low pressure adopts surrounding to have the aluminum alloy casing 5 of radiating groove, power component 3 is welded on control circuit board 2, ceramic substrate 4 is the hot link body of power component 3 and aluminum alloy casing 5 inner tip, and control circuit board 2 outers are not less than 5mm apart from aluminum alloy casing 5 medial surfaces; Aluminum alloy casing heat-conducting silicon rubber 1 entity embedding for 5 remaining space inside.

The utility model power module adopts optocoupler to set up into voltage stabilizing circuit with output reference chip TL431, controls power module and has high-precision advantage.Its operation principle is: when power module output voltage higher than set output voltage time, the inner conducting of the output reference chip TL431 that is connected with optocoupler, realize the conducting of optocoupler internal body diodes, the triode operating state of inner another section of internal illumination control optocoupler, the collector electrode of the inner triode of optocoupler connects the feedback end of control chip, and emitter connects control chip ground; When power module output voltage lower than set output voltage time, the output reference chip TL431 not conducting of inside that is connected with optocoupler, optocoupler is not worked, and so circulates and goes down to have realized closed loop feedback, has set up the general principle of power module voltage stabilizing.

In the utility model power module, optocoupler has played the effect of electrical isolation, and because its power module has the requirement of high-isolation, so optocoupler necessity of selecting has high-isolation H11A817C, its isolation is withstand voltage is AC3000V.

The inner heat-conducting silicon rubber vacuum encapsulation mode that adopts of the utility model power module, its heat-sinking capability is very good, can ensure the heat radiation of interiors of products and the heat balance of each several part.By extremely low air pressure, the bubble in Embedding Material is deviate from, realized entity package at interiors of products.Entity embedding not only can moisture resistant, salt thing, and can ensure that product fully adapts to the adverse circumstances requirements such as vibratory impulse.The dielectric strength of heat-conducting silicon rubber will far be better than the dielectric strength of air simultaneously, adopts after the embedding of silicon rubber entity, and same insulating requirements can realize by less spacing, is convenient to interiors of products space utilization, convenient design.

By adopting above-mentioned design, it is in 50W situation that the utility model power module has been realized in power output, power module input and output isolation, isolating withstand voltage is AC2000V, leakage current is less than 5 milliamperes, input voltage covers DC9-DC36V, output voltage covers DC5-DC24V(single channel), voltage accuracy for being not more than ± the designing technique index such as 1%, and nonstandardized technique product is (in the railway system under Special use environmental condition, in mine down-hole system), be widely applied.

The utility model is not limited to above-mentioned preferred forms, and other any or akin products identical with the utility model that anyone draws under enlightenment of the present utility model, within all dropping on protection range of the present utility model.

Claims

1. the integrated high-isolation power module of low pressure, comprises transformer, optocoupler and control circuit board; It is characterized in that: the integrated high-isolation power module of low pressure adopts single-ended reverse exciting circuit, transformer adopting circular ring type transformer, its coiling order be elementary-compole-secondary, winds the line and all adopts high enamel insulated wire, magnet wire insulation intensity is not less than AC7500V; Between primary winding and auxiliary winding, carry out 1 layer of insulation processing coiling with individual layer Kapton Tape, its individual layer Kapton Tape dielectric strength is not less than AC6000V; Between the auxiliary winding of transformer T and winding, carry out 2 layers of insulation processing coilings with individual layer Kapton Tape, its double-deck Kapton Tape dielectric strength is not less than AC12000V; Be fixed with silicon rubber at coiling position, crossing; Optocoupler is H11A817C, and its isolation is withstand voltage is AC3000V; The integrated high-isolation power module of low pressure adopts surrounding to have the aluminum alloy casing (5) of radiating groove, power component (3) is welded on control circuit board (2), ceramic substrate (4) is the hot link body of power component (3) and aluminum alloy casing (5) inner tip, and control circuit board (2) outer is not less than 5mm apart from aluminum alloy casing (5) medial surface; Aluminum alloy casing (5) heat-conducting silicon rubber for remaining space inside (1) entity embedding.

2. the integrated high-isolation power module of low pressure according to claim 1, is characterized in that: between the input of the integrated high-isolation power module of low pressure and output pin, adopt ceramic substrate isolation.