CN204668240U

CN204668240U - A kind of accelerating relay is opened and is reduced the switching circuit of relay heating

Info

Publication number: CN204668240U
Application number: CN201520287390.5U
Authority: CN
Inventors: 黄世勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2015-05-06
Filing date: 2015-05-06
Publication date: 2015-09-23
Anticipated expiration: 2025-05-06

Abstract

The utility model discloses the switching circuit that a kind of accelerating relay is opened and reduced relay heating, comprise circuit ACIN_L and ACIN_N and hold input AC220V voltage, relay R EL1 control ACOUT_L and ACOUT_N output AC voltage drive lamp, it is characterized in that, also comprise reduction voltage circuit, rectification circuit, common mode rejection circuit, voltage stabilizing circuit, drive circuit and single chip machine controlling circuit; Single chip machine controlling circuit is made up of single-chip microcomputer U2 (CS98P154) and interrupteur SW 1 and indicator light LED1 and relay drive circuit; Voltage stabilizing circuit connects relay R EL1, reduction voltage circuit and rectification circuit.Realize relay two-stage voltage driven by Single-chip Controlling drive circuit, high voltage accelerating relay is opened and is reduced contact vibration prolongation contact endurance; Low-voltage maintains relay conducting and is conducive to reducing power consumption and the heating increase stability of a system.

Description

A kind of accelerating relay is opened and is reduced the switching circuit of relay heating

Technical field

The utility model relates to switching circuit technical field, particularly relates to the switching circuit that a kind of accelerating relay is opened and reduced relay heating.

Background technology

Fig. 1 is the circuit that present most of relay switch on the market adopts, ACIN_L and ACIN_N inputs AC220V voltage, ACOUT_L and ACOUT_N output AC voltage; C4 is capacitance decompression electric capacity, and resistance R11 is C4 residual voltage bleeder resistance; R13 is current-limiting resistance, D1 bridge rectifier; Z1 voltage stabilizing didoe EC2 filter capacitor; The voltage stabilizing of 12V voltage is supplied to module work voltage to 3V by U1 voltage stabilizing IC; Q2 is relay driving transistors, single-chip microcomputer U2 3 pin export high level time relay open.This circuit has following defect: one is that stand-by power consumption is high, device heating heats up higher, during 220VAC/50Hz, stand-by power consumption calculates: capacitive reactance Z=1/ (2 ∏ fc)=1/ (2x3.14x50x0.47x10-6)=6.78Kohm, wherein can provide electric current to be: I=U/R=220/6.78=32mA.Active power is not consumed, so the stand-by power consumption of circuit depends on be connected on electric capacity Z1, U1 shunt load below because pure electric capacity does not do useful work at AC circuit.The electric current consumed due to U1 and single-chip microcomputer U2 is less than the electric current that 3mA is then left and will consumes on Z1, so consume stand-by power consumption Wz=UI=12x0.032=0.38W on Z1.Due to the deviation of device, survey within the scope of 0.35-0.38W.Because electric current most time standby is converted to heat so Z1 temperature rise is large by Z1, actual measurement temperature rise is about 15 degree (higher than ambient temperature 15 degree after working long hours 2 hours), and the actual measurement of complete machine stand-by power consumption instrument is at 0.7-0.8W.Two is easily burn out R11, and R11 is C4 residual voltage bleeder resistance, and during normal work, resistance both end voltage can reach 220x1.41-12x1.41 ≈ 293V, and this voltage is directly added in R11 two ends, very easily produces sparking and burn out when the volume ratio of resistance is less.Three is that voltage stabilizing IC cost is higher, due to direct voltage in stand-by circuit can not lower than the operating voltage of relay voltage stabilizing chip U1 must select the chip of withstand voltage 18-24V, and the cost of this chip can than the left and right that doubles of withstand voltage 6V.

Summary of the invention

In order to solve above-mentioned the deficiencies in the prior art, the utility model provides the switching circuit that a kind of accelerating relay is opened and reduced relay heating, because the speed of relay when opening is accelerated, reducing contact and duration of oscillation when contact is opened and extending contact endurance; Stability is added because relay adopts to decrease coil heating lower than relay working voltage and reduce power consumption after opening.

The technical scheme that the utility model adopts is: a kind of accelerating relay is opened and reduced the switching circuit of relay heating, comprise circuit ACIN_L and ACIN_N and hold input AC220V voltage, relay R EL1 control ACOUT_L and ACOUT_N output AC voltage drive lamp or other AC load, it is characterized in that, also comprise reduction voltage circuit, rectification circuit, common mode rejection circuit, voltage stabilizing circuit, drive circuit and single chip machine controlling circuit, wherein, single chip machine controlling circuit is by single-chip microcomputer U2(CS98P154) connecting valve SW1 and indicator light LED1 and output relay drive singal, voltage stabilizing circuit connects relay R EL1, reduction voltage circuit and rectification circuit.

Relay drive circuit is by single-chip microcomputer U2(CS98P154) 6 pin contact resistance R15, R12, R8, PNP triode Q3 and NPN triode Q4; Single-chip microcomputer U2(CS98P154) 12 pin contact resistance R19, R2, R1, R6, PNP triode Q2 and NPN triode Q1, NPN triode Q1 connects voltage stabilizing circuit, the emitter of NPN triode Q4 connects relay R EL1, single-chip microcomputer U2(CS98P154) 5 pin contact resistance R17, R16, R14, R6, PNP triode Q6 and NPN triode Q5, NPN triode Q5 connects a voltage-stabiliser tube Z3, and voltage-stabiliser tube Z3 connects voltage stabilizing circuit.

Described reduction voltage circuit comprises resistance R5, R10, R11 series connection and is connected with electric capacity C4, for after down circuitry, electric capacity C4 residual voltage provides discharge loop.

It is in parallel that described rectification circuit comprises resistance R4, R13; one end of resistance R4 connects bridge rectifier D1(MB8S) 2 pin; simultaneously bridge rectifier D 1(MB8S) 1 pin connect electric capacity C2 and common mode ring-shaped inductors TRAN1; electric capacity C2 and common mode ring-shaped inductors TRAN1 forms common mode rejection circuit, and during reduction relay R EL1 switching load, impulsive noise is on the impact of single chip machine controlling circuit.

Described voltage stabilizing circuit comprises voltage-stabiliser tube Z1, Z2, filter capacitor EC2, EC3, and voltage-stabiliser tube Z1, Z2 connect, and connects simultaneously, then connect a voltage stabilizing chip U1 (ME6206A30) with filter capacitor EC2, EC3,

The vdd terminal of described voltage stabilizing chip U1 (ME6206A30) connects anti-interference magnetic bead FB3, FB4 and electric capacity C1, C3.

The design of this switching circuit adopts two-stage voltage driven, and high voltage accelerating relay is opened and reduced contact vibration prolongation contact endurance; Low-voltage, maintains low-voltage and is conducive to reducing power consumption and the heating increase stability of a system.Because relay construction includes reseting shrapnel, contact, iron core and coil, the power of armature counteracting reseting shrapnel is pulled then to open contact when applying 12V operating voltage coil generation magnetic field to relay coil, contact so the moment contacted has an active force rebounded to cause contact namely to disconnect direction toward the dynamic fortune of magnetic force opposite direction because contact and contact are crusts, and now the active force in magnetic field, also so this reaction force can be more and more weak until disappear reach stable state, is the conducting vibration of relay during this period of time; Variant within the scope of 0.2 ~ 0.8mS (use 100 model GQ-SH-112L relay contact analog control system obtain result) between the individuality that conducting duration of oscillation is different, conducting vibration causes the easy adhesion of striking sparks of bringing onto load contact to shorten relay band and carry the life-span; In order to shorten relay conducting duration of oscillation, adopting and promoting relay coil operating voltage increase magnetic field intensity thus the duration of oscillation of shorting contacts.

Relay accelerates to open sequential: 12 pin output low level Q1 single-chip microcomputer U2(CS98P154) end Q2 cut-off, Z1 and EC2 two ends start to set up 15V direct voltage (changing depending on the height of input ac voltage in 50 ~ 100mS) Z1 and EC2 both end voltage and rise to stable 15V; After 150mS, 6 pin of single-chip microcomputer export high level Q3 conducting Q4 turn-on relay coil to accelerate to open (relay nominal operating voltage is for 12V) higher than operating voltage; Relay is opened and is maintained single-chip microcomputer U2(CS98P154 after 150mS) the 5th pin export high level, Q6 conducting Q5 turn-on relay coil voltage drops to 10V and opens to maintain relay, and low ME for maintenance is conducive to reducing relay and generates heat.

Tandem voltage stabilizing stand-by power consumption gadget heating temperature rise is little, and during 220VAC/50Hz, stand-by power consumption calculates: capacitive reactance Z=1/ (2 ∏ fc)=1/ (2x3.14x50x0.47x10-6)=6.78Kohm provides electric current I=U/R=220/6.78=32mA; Because time standby, Q1 is zero not consumed power in conducting state Z1 both end voltage, so the total stand-by power consumption consumed on Z2 is about Wz=UI=3.9x0.032=0.125W; Actual measurement is within the scope of 0.12 ~ 0.14W; Also low-temperature-rise is also just very little for the low so heat that converts to of voltage due to Z2 two ends, and actual measurement temperature rise is about 5 degree (higher than ambient temperature 5 degree after working long hours 2 hours); The actual measurement of complete machine stand-by power consumption instrument is at 0.3 ~ 0.5W.

Not easily burn residual voltage bleeder resistance, C4 residual voltage bleeder resistance is connected by three resistance R5, R10, R11, three resistance terminal voltage 220x1.41-4.3x1.41 ≈ 304V during normal work, it be 39V, R10 two ends be 86V, R11 two ends is 178V that this voltage drops on R5 two ends, is assigned with pressure drop so not easily produce sparking because terminal voltage is high and burn out by three resistance.

Voltage stabilizing IC cost is low, be no more than 5V based on single-chip microcomputer operation DC voltage, can select low pressure drop withstand voltage 6V voltage stabilizing IC (ME6206A30), its cost is 0.1 yuan, voltage stabilizing IC(ME6201A30 compared to now conventional) cost about 0.28 yuan, thus save cost.

Accompanying drawing explanation

Fig. 1 is existing traditional relay switching circuit figure.

The circuit diagram that Fig. 2 improves for the utility model.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is further described.

Please refer to accompanying drawing 2, a kind of accelerating relay is opened and is reduced the switching circuit of relay heating, comprise circuit ACIN_L and ACIN_N and hold input AC220V voltage, relay R EL1 control ACOUT_L and ACOUT_N output AC voltage drive lamp or other AC load, it is characterized in that, also comprise reduction voltage circuit, rectification circuit, common mode rejection circuit, voltage stabilizing circuit, drive circuit and single chip machine controlling circuit, wherein: single chip machine controlling circuit is by single-chip microcomputer U2(CS98P154) connecting valve SW1 and indicator light LED1 and output relay drive singal, voltage stabilizing circuit connects relay R EL1, reduction voltage circuit and rectification circuit.

Relay drive circuit is by the 6 pin contact resistance R15 of single-chip microcomputer U2, R12, R8, PNP triode Q3 and NPN triode Q4; Single-chip microcomputer U2(CS98P154) 12 pin contact resistance R19, R2, R1, R6, PNP triode Q2 and NPN triode Q1, NPN triode Q1 connects voltage stabilizing circuit, the emitter of NPN triode Q4 connects relay R EL1, single-chip microcomputer U2(CS98P154) 5 pin contact resistance R17, R16, R14, R6PNP triode Q6 and NPN triode Q5, NPN triode Q5 connects a voltage-stabiliser tube Z3, and voltage-stabiliser tube Z3 connects voltage stabilizing circuit

Described reduction voltage circuit comprises resistance R5, R10, R11 series connection and is connected with electric capacity C4, for after down circuitry, electric capacity C4 residual voltage provides discharge loop.C4 decompression capacitor is to relay R EL1 and all low-voltage circuits provide operating current and voltage below.R5, R10, R11 series connection object is the pressure drop reducing single resistance two ends, prevent single resistance drop excessive and burn out, resistance R4 and R13 is current-limiting resistance, in parallel to increase resistor power, prevents electric capacity C4 in the impact of powered on moment short-circuiting effect big current high voltage buffering to late-class circuit.

It is in parallel that described rectification circuit comprises resistance R4, R13; one end of resistance R4 connects 2 pin of bridge rectifier D1 (MB8S); 1 pin of bridge rectifier D 1 (MB8S) connects electric capacity C2 and common mode ring-shaped inductors TRAN1 simultaneously; electric capacity C2 and common mode ring-shaped inductors TRAN1 forms common mode rejection circuit; during reduction relay R EL1 switching load, impulsive noise is on the impact of single chip machine controlling circuit, reduces the problem resetting and crash.

Described voltage stabilizing circuit comprises voltage-stabiliser tube Z1, Z2, filter capacitor EC2, EC3, voltage-stabiliser tube Z1, Z2 connect, connect with filter capacitor EC2, EC3 simultaneously, connect a voltage stabilizing chip U1(ME6201A30 again), described voltage stabilizing chip U1(ME6201A30) vdd terminal connect anti-interference magnetic bead FB3, FB4 and electric capacity C1, C3.Z1, EC2, Z2, EC3 are serial regulating circuit, Z1, EC2 for providing stable 15V voltage when relay is opened, Z3 for relay open after 10V ME for maintenance is provided; Z2, EC3 provide voltage stabilizing 3.9V voltage for modular circuit and LED light etc.; EC3 is low pressure 3.9V filter capacitor, and EC2 is the ripple that relay coil voltage filter capacitor reduces voltage when relay is opened.

The relay switching circuit of this improvement adopts two-stage voltage driven, and high voltage accelerating relay is opened and reduced contact vibration prolongation contact endurance; Low-voltage, maintains low-voltage and is conducive to reducing power consumption and the heating increase stability of a system.Q1 and Q2 for providing 15V driving voltage when relay is opened, single-chip microcomputer U2(CS98P154 time standby) 12 pin export high level Q2 conducting Q1 conducting Z1 and EC2 two ends and there is no voltage; When needing to open relay, 12 pin output low level Q1 of single-chip microcomputer end Q2 cut-off, Z1 and EC2 two ends start to set up 15V direct voltage (in 50 ~ 100mS, Z1 and EC2 both end voltage rises to stable 15V); After 150mS, 6 pin of single-chip microcomputer export high level Q3 conducting Q2 turn-on relay coil to accelerate to open (relay working voltage is for 12V) higher than operating voltage; Relay is opened and is maintained single-chip microcomputer U2(CS98P154 after 150mS) the 5th pin export high level, Q6 conducting Q5 turn-on relay coil voltage drops to 10V and opens to maintain relay, relay coil voltage is reduced to 10V and is conducive to reducing relay heating, improves relay life.

Above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to execution mode of the present utility model.And for belong to connotation of the present utility model the apparent change of extending out or variation still belong to protection range of the present utility model.

Claims

1. an accelerating relay is opened and reduces the switching circuit of relay heating, comprise circuit ACIN_L and ACIN_N and hold input AC220V voltage, relay R EL1 control ACOUT_L and ACOUT_N output AC voltage drive lamp, it is characterized in that, also comprise reduction voltage circuit, rectification circuit, common mode rejection circuit, voltage stabilizing circuit, drive circuit and single chip machine controlling circuit, wherein:

Single chip machine controlling circuit is made up of single-chip microcomputer U2 and interrupteur SW 1 and indicator light LED1 and relay drive circuit, and the model of single-chip microcomputer U2 is CS98P154, and voltage stabilizing circuit connects relay R EL1, reduction voltage circuit and rectification circuit;

Relay drive circuit is by the 6 pin contact resistance R15 of single-chip microcomputer U2, R12, R8, PNP, triode Q3 and NPN triode Q4; The 12 pin contact resistance R19 of single-chip microcomputer U2, R2, R1, R6, PNP triode Q2 and NPN triode Q1, NPN triode Q1 connects voltage stabilizing circuit, the emitter of NPN triode Q4 connects relay R EL1, the 5 pin contact resistance R17 of single-chip microcomputer U2, R16, R14, R6, PNP triode Q6 and NPN triode Q5, NPN triode Q5 connects a voltage-stabiliser tube Z3.

2. a kind of accelerating relay according to claim 1 is opened and is reduced the switching circuit of relay heating, it is characterized in that: described reduction voltage circuit comprises resistance R5, R10, R11 series connection and is connected with electric capacity C4, for after down circuitry, electric capacity C4 residual voltage provides discharge loop.

3. a kind of accelerating relay according to claim 1 is opened and is reduced the switching circuit of relay heating; it is characterized in that: it is in parallel that described rectification circuit comprises resistance R4, R13; one end of resistance R4 connects 2 pin of bridge rectifier D1; the model of bridge rectifier D 1 is MB8S; 1 pin of bridge rectifier D 1 connects electric capacity C2 and common mode ring-shaped inductors TRAN1 simultaneously; electric capacity C2 and common mode ring-shaped inductors TRAN1 forms common mode rejection circuit, and during reduction relay R EL1 switching load, impulsive noise is on the impact of single chip machine controlling circuit.

4. a kind of accelerating relay according to claim 1 is opened and is reduced the switching circuit of relay heating, it is characterized in that: described voltage stabilizing circuit comprises voltage-stabiliser tube Z1, Z2, filter capacitor EC2, EC3, voltage-stabiliser tube Z1, Z2 connect, connect with filter capacitor EC2, EC3 simultaneously, connect a voltage stabilizing chip U1 again, the model of voltage stabilizing chip U1 is ME6206A30.

5. a kind of accelerating relay according to claim 4 is opened and is reduced the switching circuit of relay heating, it is characterized in that: the vdd terminal of described voltage stabilizing chip U1 connects anti-interference magnetic bead FB3, FB4 and electric capacity C1, C3.