CN2904421Y

CN2904421Y - Blocking type overvoltage resistance surge inhibiting power filter

Info

Publication number: CN2904421Y
Application number: CN 200620033849
Authority: CN
Inventors: 范国君
Original assignee: Xinxinshenfeng Electronics Science And Technology Co Ltd Chengdu
Current assignee: Xinxinshenfeng Electronics Science And Technology Co Ltd Chengdu
Priority date: 2006-04-17
Filing date: 2006-04-17
Publication date: 2007-05-23
Anticipated expiration: 2016-04-17

Abstract

The utility model discloses an obstructing overvoltage-tolarated surge suppression filter, comprising the KL module and the EMI power filter, which are provided with the multiple common mode circuit and the differential mode circuit. The KL module is connected in the plus end of the power supply which is connected with the EMI power filter. The utility model uses the exclusive IC imported abroad and the peripheral circuit to form the KL module, which is connected to the plus end connected to the EMI power filter. When the +80V surge voltage appears, the KL module obstruct the pathway of the power supply quickly, avoiding the impact of the overvoltage surge on the subsequent equipment. When the voltage restores to the normal state, the KL module applies the power at once, the equipment being back to the state of normal work. The utility model is characterized in a small size, a quick response speed, a perfect protection function and a high reliability.

Description

The blocking-up type surge of anti-the overvoltage suppresses power-supply filter

Technical field

The utility model relates to filter, especially relates to a kind of blocking-up type surge of anti-the overvoltage and suppresses power-supply filter.

Background technology

At present, according to GJB181 aviation power supply characteristic and to the requirement of power consumption equipment, airborne DC equipment all will be carried out anti-overvoltage surge test.This test requirements document power supply jumps+80V from normal steady state voltage+28V, and duration 50ms returns to+28V then, is doing 5 tests in the 5min clock continuously, requires equipment energy operate as normal after voltage recovers.The power-supply filter that is used for the anti-electromagnetic interference of airborne equipment, great majority adopt L, C device, and all more than 100V, just itself, there is not any problem in anti-anti-overvoltage surge test to the proof voltage ability.

Airborne instrument, the working power of instrument be+28V, requires can work when overvoltage+40V.Important data acquisition equipment also requires+and still can operate as normal during the 80V overvoltage surge.Therefore, the power-supply filter of airborne anti-electromagnetic interference must possess the surge of anti-overvoltage inhibit feature.When suppressing the overvoltage surge of thunder and lightning, generation of static electricity, great majority adopt as snowslide voltage stabilizing didoe, piezo-resistance, can recover fuse, air spark gap, gas-filled surge discharger, controllable silicon, transient voltage inhibition diode devices such as (TVS) and form multistage voltage stabilizing, bypass type surge protection circuit.Requiring to resist+80V, continuing under the specific condition of the 50ms surge of anti-the overvoltage, the voltage stabilized range of above-mentioned device, shunting ability, response time are subjected to certain restriction.TVS etc. are used for basic circuit such as Fig. 1 that surge suppresses.When the circuit operate as normal, the current-limiting resistance R1 on the major loop will consume bigger power, and this just brings problems such as voltage drop, power consumption, volume, heat radiation, cost, reliability.Therefore, general voltage stabilizing, the requirement that the bypass type device can't satisfy the anti-overvoltage surge test of air environment in actual applications.

Overvoltage surge test equipment will provide+the 28V power supply, and this just provides the condition that makes things convenient for for the blocking-up type surge of anti-overvoltage inhibition method.Principle such as Fig. 2 that the blocking-up type surge of anti-the overvoltage suppresses.Electronic switch K1 is connected on the major loop, and internal cutting off power supply during the surge of anti-the overvoltage reaches the purpose of protecting follow-up electronic circuit.The electronic switch that the blocking-up type surge of anti-the overvoltage suppresses should satisfy the response time fast, conducting resistance is little, do not have the overshoot oscillating voltage when turn-offing, enough electric current and power consumption, little, the high requirement of reliability of volume.The existing blocking-up type surge of anti-the overvoltage suppresses product because of adopting resolution element, have volume big, cost an arm and a leg, lack deficiencies such as perfect defencive function, reliability are low, be difficult in the power-supply filter of anti-electromagnetic interference and adopt.

Summary of the invention

The purpose of this utility model provides the blocking-up type surge of anti-overvoltage that a kind of response time is fast, reliability is high and suppresses power-supply filter.

In order to achieve the above object, the utility model adopts following technical scheme: this filter comprises that the blocking-up type surge of anti-the overvoltage suppresses module (being called for short the KL module) and EMI power-supply filter, wherein the EMI power-supply filter is made up of multistage common-mode circuit and differential mode circuit, and the blocking-up type surge of anti-the overvoltage suppresses module (KL module) and is serially connected in the power positive end that is connected with the EMI power-supply filter.

The utility model adopts application-specific integrated circuit and peripheral circuit to be assembled into the KL module, the KL module is serially connected in the power positive end that is connected with the EMI power-supply filter.+ when the 80V surge voltage occurred, this KL module was blocked power path fast, made follow-up equipment avoid the impact of overvoltage surge.Recover just often at voltage, this KL module demand working power supply, equipment is got back to the normal power supply operating state.The utlity model has that volume is little, response speed is fast, defencive function is perfect, high reliability features.

Description of drawings

Fig. 1 is a TVS surge protection circuit schematic diagram;

Fig. 2 is the blocking-up type surge restraint circuit of anti-an overvoltage schematic diagram;

Fig. 3 is the blocking-up type surge of anti-an overvoltage rejects trap circuit diagram.

Embodiment

Structure such as Fig. 1, Fig. 2, shown in Figure 3 of a kind of blocking-up type of the utility model surge of anti-overvoltage rejects trap.In Fig. 2, constitute the blocking-up type surge restraint circuit of anti-the overvoltage by load RL and electronic switch K1 series connection back and capacitor C 1 are in parallel.KL module and EMI power-supply filter are combined, and just become the high performance blocking-up type surge of anti-the overvoltage and suppress power-supply filter, and circuit is seen Fig. 3.Wherein the EMI power-supply filter is made up of multistage common-mode circuit and differential mode circuit.Common mode capacitance CY and common mode inductance L 1 constitute common-mode circuit; Differential mode capacitor CX and differential mode inductance L2 constitute the differential mode circuit.The KL module is serially connected in the power positive end that is connected with the EMI power-supply filter.Described KL module adopts the application-specific integrated circuit of external import and peripheral circuit to form.KL module in the utility model has different rated current grades, fast make-and-break time, extremely low conducting resistance, minimum quiescent current and very perfect defencive function.As overtemperature prote, overvoltage and under-voltage protection, short circuit and open circuit protection, power supply reverse polarity protection, antistatic and diagnostic state indication etc.This high performance blocking-up type surge of anti-the overvoltage suppresses module and is assembled in the different power-supply filters, helps airborne DC equipment by the anti-overvoltage surge test of GJB181.

Claims

1, a kind of blocking-up type surge of anti-the overvoltage suppresses power-supply filter, it is characterized in that: this filter comprises that the blocking-up type surge of anti-the overvoltage suppresses module and EMI power-supply filter, wherein the EMI power-supply filter is made up of multistage common-mode circuit and differential mode circuit, and the blocking-up type surge of anti-the overvoltage suppresses module and is serially connected in the power positive end that is connected with the EMI power-supply filter.

2, the blocking-up type surge of anti-overvoltage the according to claim 1 suppresses power-supply filter, and it is characterized in that: the KL module is made up of application-specific integrated circuit and peripheral circuit.