CN202059332U

CN202059332U - Power source of frequency-hopping resonant switch

Info

Publication number: CN202059332U
Application number: CN2010201082773U
Authority: CN
Inventors: 梁晓
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-02-01
Filing date: 2010-02-01
Publication date: 2011-11-30
Anticipated expiration: 2020-02-01

Abstract

The utility model relates to a power source of a frequency-hopping resonant switch. In the utility model, an initiative frequency-hopping technology is adopted for coping with the variation of output power and the problem of electromagnetic compatibility; and frequencies which are synchronous with frequency-hopping are adopted for driving a power factor correcting circuit; and a rapid feedback circuit is adopted for reducing output ripples.

Description

Frequency hopping resonant switch power supply

Technical field

Frequency hopping resonant switch power supply of the present invention is to belong to a kind of electricity field, is used for power conversion and transmission.As AC-DC, direct current becomes direct current, exchanges to become to exchange.Therefore, only will exchange output, just directly be transformer secondary output output after conversion, and direct current is just being exported behind the ballast diode after the conversion: VCC and GND-2.

Background technology

Because resonant switch power-efficient height is used many much in recent years.Mainly be divided into two big classes now, a kind of is resonant transformation, but also will reach voltage stabilizing with pulse-width modulation (PWM), owing to be in the PWM state, efficient has reduced.Another kind is quasi-resonance conversion (LLC), mainly reaches voltage stabilizing by regulating frequency, and at this moment not near resonance and quasi-resonance, efficient has reduced much frequency.These two kinds all will have the frequency-tracking function to make it frequency conversion ability operate as normal, the circuit complexity, and quasi-resonance conversion in addition (LLC) design of transformer complexity will be calculated two inductance values and circuit and cooperate.This paper gets its advantage, adopts initiatively frequency hopping, and near minimum all being operated in the quasi-resonance having how many some air gap portion operate as normal such as air gap and no air gap state when adopting common transformer such as EE and EI transformer.Well-known, improve the efficient of Switching Power Supply, particularly powerful, traditional Switching Power Supply will be adjusted high-frequency transformer coils turn ratio and magnetic core air gap repeatedly, adjust through long-time.Voltage stabilizing has improved efficient undoubtedly by half-wave is next one by one in addition, has reduced noise.Owing to adopt initiatively frequency hopping, therefore, but adopt all design circuits of common components and parts or 8051 single-chip microcomputers, add that the voltage stabilizing feedback circuit is exactly the resonant switch power supply of numeral fast.

Summary of the invention

Frequency hopping resonant switch power supply is by current rectifying and wave filtering circuit, power tube, drive circuit, frequency generating circuit, inductance, electric capacity with assist a ruler in governing a country circuit and form.Frequency hopping resonant switch power supply is initiatively, also satisfies electromagnetic compatibility (EMI) requirement; Be digitized, also can hide out some frequency; Be to drive by two groups or more the vibration frequency timesharing of active of setting, that is to say the driving of frequency hopping, drive half-bridge or full-bridge respectively and go to remove to form resonance to inductance capacitance, inductance is coupled to load by electromagnetic induction, by the secondary power output of high frequency transformer.The driving frequency of power emphasizer circuit be with the jumping frequency rate that forms resonance be synchronous, help reduce disturbing; It drives input and directly links to each other with a wherein arm of the driving of main transformer.Voltage stabilizing is finished by half-wave one by one, output be complete half-wave or complete all-wave, reduced noise owing to be known fixing frequency, the output filter design easily.Other adopts quick feedback circuit to reduce the output ripple, is made up of high speed photo coupling (HCPL-4506 or 6N137) and quick sample circuit.Usual TL431 and PC817 only are operated in 16 KHz with lower frequency.The circuit of regulation voltage or electric current is made up of the rapid-action testing circuit, has reduced ripple.Resonance and quasi-resonance are directly determined by the inductance of main circuit and the electric capacity resonance frequency that is in series, and so mainly change in inductance and the electric capacity any, just can change its resonance frequency.The frequency of working at ordinary times just the frequency of resonance and near, F _T=1/2 ∏ √ (LC), calculating resonance frequency is the same with textbook.Design cycle is, selects great operating frequency as requested for use, and operating frequency is high more, and the magnetic core size is more little, considers the ability to bear of channel frequency, and the general work frequency is to be operated in 20 to 150 KHz less than two five megahertzes at ordinary times.Select much magnetic cores for use according to power, getting quality factor then is 10, can calculate the value of inductance and electric capacity so.Can calculate the number of turns of coiling according to inductance, electric capacity is above with withstand voltage 1,002 hectovolts, as CBB22 series.

Again accompanying drawings once principle: Fig. 1 be the underarm drive circuit of half-bridge, QA6, QA7 are two inverter RA7, RA8 is clamped pull down resistor, QA2, QA4 are totem output (emitter is recommended).Fig. 2 is the upper arm drive circuit of half-bridge, and QA5 is an inverter, and RA6 is clamped pull down resistor, and QA1, QA3 are totem output (emitter is recommended), and UA6 is that high speed photo coupling plays buffer action, and CA1, DA1 are boostrap circuit, and OUT-P is the mid point that is connected to half-bridge.Fig. 3 is a kind of circuit of high-speed feedback, and VCC is the sampling point of output voltage, and QA8 is a field effect transistor, also available dual-polar triode, and RA13, D1 forms voltage stabilizing circuit, and OUT-3 is output.Fig. 4 also is a kind of circuit for high-speed feedback, and VCC is the sampling point of output voltage, and DA1, D1 are voltage stabilizing didoe, select the voltage stabilizing value for use according to concrete output, and UA2 is inner band integrated circuit high speed photo coupling, and OUT-3 is the output result.Fig. 5 is the Switching Power Supply structure of typical half-bridge structure, and this circuit is a series resonance, and main coil has added a capacitor C B1 therein.TRA1 is the high frequency transformer of ten pin, 3, the 4 ends circle of serving as theme.QA9, QA10 are last underarm power tube, and IN-P2, IN-P1 are last underarm input point.300V---390V is a power supply.The modulating frequency generator that Fig. 6 forms for digital circuit.IC4 is Schmidt's not gate 74HC14, and per two doors are formed a signal generator.5,6,8,9 compositions change frequent rate and go to switch two groups of resonance frequencys (1,2,3 of IC4 by the control pin of IC6 (CD4066), 4 pin and 10,11,12,13 pin are respectively formed one group), go the CP pin of IC5 (CD4017) to form the pulse that the dead band is gone in formation, per four diodes are formed one and door among the figure, be divided into underarm output (IN---P1, IN---P2), QB6 is the voltage stabilizing control valve, preferably goes control again by a monostable.Fig. 7 is except rectification and common voltage stabilizing, with 8051 form with the practical figure of IR2181 rotating band capability correction.Usually usage has not just been said, mainly says down flow process.IC3 forms the circuit of frequency generation, switching and the voltage stabilizing of AT89C2051.P3.7, P3.5 drive IC2 (IR2181) HIN, LIN input by HO, LO remove to drive QB1, QB2 power makes inductance TRB1, capacitor C B1 form resonance to pipe.UA3, QA8 form the high speed photo coupling voltage stabilizing and remove to control the high-low level of 2051 P1.0 (input) pin and reach the voltage stabilizing purpose.Synchronizing signal and IC1 (IR2181) Q1, DB9, LB1 that RB9 (5K) takes from the frequency hopping upper arm form power factor correction circuit.QB8, RB11, RB10 form the current limliting breaking circuit.RB7, RB8, QB7 form controlling circuit of voltage regulation, turn-off by turn-offing input, reach the just temporary transient QB8 of shutoff of set point.

Description of drawings

This description of drawings is as follows: Fig. 1 is the underarm drive circuit of half-bridge, Fig. 2 is the upper arm drive circuit of half-bridge, Fig. 3 is a kind of circuit of high-speed feedback, Fig. 4 also is a kind of circuit for high-speed feedback, Fig. 5 is the Switching Power Supply structure of typical half-bridge structure, the modulating frequency generator that Fig. 6 forms for digital circuit, Fig. 7 are the practical figure of capability correction.The secondary of main transformer TRB1 is 5,6,7,8 ends as seen from the figure, also is the conversion output, also is feedback end.Obviously also being the output of right 2, also is this load end of right 1.

Embodiment

Transformer is wanted laminated insulation and coiling.+ 5 volts ,+18 volts adopt behind resistance or the capacitance decompression voltage stabilizing or provide by assisting a ruler in governing a country Switching Power Supply, as the TOP200 circuit that common desk-top computer power is used, this is in daily use, and does not do introduction.It is adjustable resistance that there is an asterisk in the resistance upper right corner, Z ^*Be undetermined or the just definite afterwards voltage stabilizing value of adjusting, C ^*It is undetermined or the just definite afterwards capacitance of adjusting.Also available 8051 single-chip microcomputers of available digital circuit at ordinary times take place frequency hopping does.Type of drive generally adds totem (emitter is recommended) output by inverter as shown, and upper arm adds uses light-coupled isolation, and electrochemical capacitor wherein is a bootstrap capacitor.Also available NCP5181, integrated circuits such as IR2181 replace.The schematic diagram international practice technique of painting.The status equivalent software program of Fig. 6 is exactly two frequency generators and close example.Fig. 7 is a complete embodiment.Inductance and electric capacity form TRB1 and the CB1 among resonance such as Fig. 7; Inductance is coupled to the TRB1 among load such as Fig. 7 by electromagnetic induction.The electromagnetic induction coupling is that a complete half-wave or a complete all-wave are made up of the TRB1 among Fig. 7, IC2, IC3 and peripheral component thereof.The circuit of regulation voltage or electric current is made up of as the UA3 of Fig. 3 or Fig. 4 or Fig. 7 and the peripheral component of QA8 the rapid-action testing circuit and is formed.The driving frequency of power emphasizer circuit be with the jumping frequency rate that forms resonance be synchronous: form by 2 pin of the IC1 of Fig. 7, the 1 pin loop of RB9, IC2.

The AT89C2051 program is as follows:

BIT_OUT1 BIT P3.7; Set output port 1

BIT_OUT2 BIT P3.5; Set output port 2

BIT_IN1 BIT P1.0; Set input mouth 1

ORG OOH; Program begins

MOV P3, #00; Port 3 initialization

MOV P1, #OFFH; The port one initialization

S1:JB BIT_IN1, S1; It is motionless to surpass the voltage stabilizing value, not super just by (establishing high level is superpressure)

SETB BIT_OUT1; Output port 1 high level (establishing high level) for driving

NOP; Time-delay command, the concrete time is adjusted by the NOP number

NOP

CLR BIT_OUT1; Output port 1 low level (establishing low level) for closing

NOP; Time-delay command, the concrete time is adjusted by the NOP number

S2:JB BIT_IN1, S2; It is motionless to surpass the voltage stabilizing value, does not surpass and just passes through

SETB BIT_OUT2; Output port 2 high level (establishing high level) for driving

NOP; Time-delay command, the concrete time is adjusted by the NOP number

NOP

CLR BIT_OUT2; Output port 2 low levels (establishing low level) for closing

NOP; Time-delay command, the concrete time is adjusted by the NOP number

Following same meaning only is the delay time difference

S3：JB BIT_IN1，S3

SETB BIT_OUT1

NOP

CLR BIT_OUT1

NOP

S4：JB BIT_IN1，S4

SETB BIT_OUT2

NOP

CLR BIT_OUT2

SJMP S1; Backspace S1 block repeats beginning

Below be each figure component parameter table:

1K?RB10

1K?RA12

1N4148 DB4

1N4148 DB6

1N4148 DB2

1N4148 DB8

1N4148 DB3

1N4148 DB1

1N4148 DB5

1N4148 DB7

2K RA11

2MH LB1 is with air gap, and size is fixed according to power

2N7000(2N3904) QA8

2SC8050 QB7

2SC8050 QB6

2SC8050 QB8

3.3V D1

3W0.51?RB11

5K RB9

6MHZ Y1

6N90 Q1

10K RB6

10K RB5

10K RA14

10K RB2

10K RB3

10K RB1

10K RB8

10K RB4

10UF CB12

27P CB16

27P CB17

74HC14?IC4

100V470UF CB15

100V470UF CB14

103P CB1

104P CB6

104P CB5

104P CB7

104P CB9

104P CB8

105P CB20

105P CB19

105P CB21

221P CB11

224P CB18

450V1UF CB10

450V47UF CB13

AT89C2051?IC3

C*?CB4

C*?CB2

C*?CB3

CD4017?IC5

CD4066?IC6

FR107 DB12

FR107 DB13

FR107 DB14

HCPL-4506 UA3

IR2181?IC1

IR2181?IC2

IRF460?QB1

IRF460?QB2

R*?RA15

R*?RB7

R*?RA13

SR306 DB10

SR306 DB11

SR306 DB9

The 39 circles two circles of/12 circles/2 circle/* TRB1 undetermined

* circle is for treating fixing turn, and size is fixed according to power

1K5 RA7

1K5 RA6

1K RA12

1K RA9

2K RA11

2K RA2

2K RA1

2K RA3

2K RA10

2N7000(2N3904) QA8

2N7000 QA6

2N7000 QA7

2N7000Q A5

2SC8050 QA1

2SC8050 QA2

2SC8550 QA4

2SC8550 QA3

3.3V D1

4K7 RA5

4K7 RA4

10K RA14

10K RA8

10UF CA1

10UF CA2

103P CB1

FR107 DA1

HCPL-4506 UA2

HCPL-4506 UA1

HCPL-4506 UA3

IRF460(6N90)?QA10

IRF460(6N90)?QA9

R* RA15

R* RA13

Z* DA2

The 39 circles two circles of/12 circles/2 circle/* TRA1 undetermined

* circle is for treating fixing turn, and size is fixed according to power.

Claims

1. frequency hopping resonant switch power supply, by current rectifying and wave filtering circuit, power tube, drive circuit, frequency generating circuit, inductance, electric capacity with assist a ruler in governing a country circuit and form, it is characterized in that the vibration frequency of active by two groups or more setting, timesharing driving power pipe makes inductance and electric capacity form resonance or quasi-resonance, is coupled to load by electromagnetic induction by inductance then.

2. frequency hopping resonant switch power supply according to claim 1 is characterized in that the electromagnetic induction coupling is a complete half-wave or a complete all-wave.

3. frequency hopping resonant switch power supply according to claim 1 is characterized in that the circuit of regulation voltage or electric current is made up of the rapid-action testing circuit.

4. frequency hopping resonant switch power supply according to claim 1, the driving frequency that it is characterized in that the power emphasizer circuit be with the jumping frequency rate that forms resonance be synchronous.