CN205335554U - Reduce stand -by power consumption and prevent control circuit that plug struck sparks through EMC test - Google Patents

Abstract

The utility model relates to a reduce stand -by power consumption and prevent control circuit that plug struck sparks through EMC test, filter circuit and relay drive circuit including interconnect, filter circuit includes resistance R1, resistance R3, resistance R4, resistance R2, electric capacity C1, electric capacity C2 and inductance L1, relay drive circuit includes power VCC, resistance R6, resistance R7, resistance R5, diode D1, relay RLY, triode Q1 and relay REL1. The utility model discloses an improve the circuit and carry out redesign, make the circuit pass through the EMC test, reduce the stand -by power consumption, effectively avoided the situation that the plug struck sparks simultaneously.

Description

A kind of control circuit by EMC test reduction stand-by power consumption and protection plug sparking

Technical field

This utility model relates to household electrical appliance control circuit field, more specifically a kind of control circuit by EMC test reduction stand-by power consumption and protection plug sparking。

Background technology

Owing to the requirement in EMC of the national standard of small household appliances industry promotes, in the face of the small household appliances of market sale will cross EMC test after 1 day January in 2016。A lot of producers solve problem by strengthening the front-end filtering electric capacity of small household appliances control circuit and relevant inductance, but can run into again because the stand-by power consumption that causes greatly very much of the capacity of front-end filtering electric capacity is too high and produces the problem that the probability of electric spark is greatly improved during plug electricity in actual use, thus during normal use bringing certain negative effect to consumer。

Utility model content

Technical problem to be solved in the utility model is to overcome deficiency of the prior art, it is provided that a kind of control circuit by EMC test reduction stand-by power consumption and protection plug sparking。

For solving prior art problem, the technical solution adopted in the utility model is:

A kind of control circuit by EMC test reduction stand-by power consumption and protection plug sparking, including interconnective filter circuit and relay drive circuit, described filter circuit includes resistance R1, resistance R3, resistance R4, resistance R2, electric capacity C1, electric capacity C2 and inductance L1, the L line of the one termination alternating current power supply of resistance R1, other end one end by resistance R3 connecting resistance R4, the N line of another termination alternating current power supply of R4, one end of resistance R2 is connected with one end of resistance R1, the other end of resistance R2 is connected by one end of electric capacity C2 and electric capacity C1, the other end of electric capacity C1 is connected with the other end of resistance R4；Inductance L1 is connected between alternating current power supply L line and N line；

Described relay drive circuit includes power supply VCC, resistance R6, resistance R7, resistance R5, diode D1, relay R LY, audion Q1 and relay R EL1；Described relay R EL1 and diode D1 is in parallel, and one end of relay R EL1 switch contact and one end of resistance R2 connect, and the other end of relay R EL1 switch contact is connected with one end of electric capacity C1；Diode D1 positive pole connecting triode Q1 colelctor electrode, diode D1 negative pole connects through resistance R5 and connects power supply VCC；Audion Q1 base stage is by the resistance R6 being connected in series and resistance R7 ground connection, and relay R LY is connected between resistance R6 and R7。This utility model, by improving circuit design, makes circuit be tested by EMC, reduces stand-by power consumption, effectively prevent the situation of plug sparking simultaneously。

Described resistance R1, resistance R3, resistance R4, resistance R6 and resistance R7 are Chip-R, have the advantages such as small product size is little, lightweight；Described resistance R2 and R5 is fixed carbon resister；Electric capacity C2 is MKP filter capacitor, and electric capacity C1 is X2 electric capacity。

Further, described inductance L1 is amorphous common mode inductance。The inductance made due to non-crystalline material has that inductance value is stable, concordance is high and the feature such as temperature rise is low, therefore adopts area and the complete machine space of the pcb board that the reduction that amorphous common mode inductance can be very big adopts。

Compared with prior art, this utility model, by improving circuit design, makes circuit pass through and improves the EMC performance of product, optimizes circuit footprint, it is achieved low standby power loss, effectively solves plug electricity simultaneously and produces electric spark phenomenon。

Accompanying drawing explanation

Accompanying drawing 1 realizes schematic diagram for this utility model。

Detailed description of the invention

Below in conjunction with accompanying drawing, this utility model is further explained explanation。Accompanying drawing being merely cited for property explanation, it is impossible to be interpreted as restriction of the present utility model；In order to the present embodiment is better described, some parts of accompanying drawing have omission, zoom in or out；To those skilled in the art, in accompanying drawing, some known features and explanation thereof are likely to omission and will be understood by。

A kind of control circuit by EMC test reduction stand-by power consumption and protection plug sparking as shown in Figure 1, first product is power-up in standby, first relay remains off, such electric capacity C1, equivalent filter circuit that C2 and resistance R2 is composed in series at the two ends of alternating current power supply, owing to the capacitance of electric capacity C2 is less, so electric capacity C1, the capacitance of the equivalent capacity of C2 composition is also smaller, such power up would not have plug-in spark phenomenon, also show less circuit loss in the standby state simultaneously, during this period, owing to load does not work, test relevant for such EMC can easily be passed through。

Secondly, when product from standby work to backend load time, at this moment first within about 2 seconds, relay is allowed to close in advance, at this moment resistance R2 and electric capacity C2 is shorted, and at this moment the electric capacity C1 that is equal to of filter capacitor independently connects in circuit, and the capacitance of electric capacity C1 is bigger simultaneously, add the amorphous common mode inductance L1 of rear end, so also it is formed for a powerful LC filter circuit, thus effectively suppressing the relevant interference that backend load work brings, particularly that the inhibitory action of space radiation is excellent。

Again, in pulling out electric process, owing to the effective electric energy of power supply VCC and relay R LY consumes rapidly, such relay R EL1 can disconnect at once, equivalent circuit when so defining standby again, a large amount of electric charges in electric capacity C1 will give electric capacity C2 charging and eventually through resistance R1 at once, R3, R4, R2 discharge, thus being quickly decreased to the safe voltage less than 36V at plug place, bring more safety to the use of user。

Obviously, above-described embodiment of the present utility model is only for clearly demonstrating this utility model example, and is not the restriction to embodiment of the present utility model。Can also make other changes in different forms on the basis of the above description, here without also cannot all of embodiment be given exhaustive。All any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included within this utility model scope of the claims。

Claims (3)

1. the control circuit by EMC test reduction stand-by power consumption and protection plug sparking, including interconnective filter circuit and relay drive circuit, it is characterized in that, described filter circuit includes resistance R1, resistance R3, resistance R4, resistance R2, electric capacity C1, electric capacity C2 and inductance L1, the L line of the one termination alternating current power supply of resistance R1, other end one end by resistance R3 connecting resistance R4, the N line of another termination alternating current power supply of R4, one end of resistance R2 is connected with one end of resistance R1, the other end of resistance R2 is connected by one end of electric capacity C2 and electric capacity C1, the other end of electric capacity C1 is connected with the other end of resistance R4；Inductance L1 is connected between alternating current power supply L line and N line；

Described relay drive circuit includes power supply VCC, resistance R6, resistance R7, resistance R5, diode D1, relay R LY, audion Q1 and relay R EL1；Described relay R EL1 and diode D1 is in parallel, and one end of relay R EL1 switch contact and one end of resistance R2 connect, and the other end of relay R EL1 switch contact is connected with one end of electric capacity C1；Diode D1 positive pole connecting triode Q1 colelctor electrode, diode D1 negative pole connects through resistance R5 and connects power supply VCC；Audion Q1 base stage is by the resistance R6 being connected in series and resistance R7 ground connection, and relay R LY is connected between resistance R6 and R7。

2. control circuit according to claim 1, it is characterised in that described resistance R1, resistance R3, resistance R4, resistance R6 and resistance R7 are Chip-R；Described resistance R2 and R5 is fixed carbon resister, and electric capacity C2 is MKP filter capacitor, and electric capacity C1 is X2 electric capacity。

3. control circuit according to claim 1, it is characterised in that described inductance L1 is amorphous common mode inductance。