CN2225109Y - Switch DC-DC inverter - Google Patents

Switch DC-DC inverter Download PDF

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Publication number
CN2225109Y
CN2225109Y CN 94229924 CN94229924U CN2225109Y CN 2225109 Y CN2225109 Y CN 2225109Y CN 94229924 CN94229924 CN 94229924 CN 94229924 U CN94229924 U CN 94229924U CN 2225109 Y CN2225109 Y CN 2225109Y
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China
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termination
output
input
meets
connects
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Expired - Fee Related
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CN 94229924
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Chinese (zh)
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李卫东
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STATE-RUN HONGMING RADIO EQUIPMENT GENERAL FACTORY CHENGDU
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STATE-RUN HONGMING RADIO EQUIPMENT GENERAL FACTORY CHENGDU
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Abstract

The utility model relates to a switch DC-DC transformer which is characterized in that the utility model comprises a filter A, an overvoltage, under-voltage, slow start and power limiting circuit B, a pulse width modulator C, a switch tube G, a resonance absorption circuit D, a transformer F, a rectifying and filtering assembly H and an overvoltage, short circuit and over-current protecting circuit I. The switching frequency reach one MHz, the utility model is provided with a switch terminal of a remote-control power supply, and the outer fine-adjustment output voltage is +/-10 percent. The utility model has the advantages of technology manufacture of a hybrid integrated circuit, small size and high reliability, and is suitable for being installed on a program-controlled exchanger to be used as a switching power supply.

Description

Switch DC-DC converter
Switch DC-DC converter relates to the switch power module assembly that uses in the stored-program control exchange.
Switch DC-DC the converter of existing technology, its switching frequency is low, and general≤300Kc, frequency density is not high enough, mostly is the copper clad plate structure simultaneously, and heat radiation and reliability are bad.
Switch DC-DC converter of providing a kind of switching frequency to reach 1MHz is provided the purpose of this utility model.The product quality height, good reliability.
Fig. 1 is the utility model switch DC-DC converter principle block diagram.
Fig. 2 is the utility model switch DC-DC converter embodiment circuit theory diagrams.
Fig. 3 is overvoltage among Fig. 2, under-voltage, current-limiting protection part B circuit diagram.
Fig. 1 switch DC-DC converter, circuit structure is: the input termination (1) of wave filter A, (2) Power supply terminal, output are taken over pressure, under-voltage, the input (3) of current-limiting protection circuit B, (4), Be attached to (PWMC) from B (5), (6) end, PWM output (11) connects switching tube G grid, switch Pipe G source ground, drain electrode meets transformer F elementary (11), and another output of PWMC is connected to resonance and inhales Receive circuit D, resonance absorbing circuit D output is connected to transformer F primary coil, transformer secondary output (12), (13) be connected to filtering unit H, by filtering unit H output termination power output terminal (( 7), (16), filtering unit in addition two samplings is connected to voltage stabilizing function parts 1 input, and is defeated by 1 Go out to hold (22), (22) to be connected to (PWM) C input (8), (9), form closed feedback loop.
Fig. 2 switch DC-DC converter embodiment circuit theory diagrams.Power supply V +Input terminal (1) connects capacitor C 1, power supply V-input terminal connects capacitor C 2, C 1, C 2Other end d ground connection, capacitor C 3Be parallel to (1), (2) end, choke L 1Elementary input (1), the L of being series at 1Secondary input (2), the L of being series at 1The input of following termination B (4), secondary input (3), the capacitor C that meets B 4Be parallel to input (3), (4) of a, be connected to (PWM) C from (5), (6) end of B, grid level from (PWM) C output termination switching tube G, the switching tube source ground, drain electrode connects transformer F elementary (11) end, (PWM) another output of C (10) is connected to resonance absorbing circuit D, and resonance absorbing circuit D output is connected to transformer F primary coil upper end, transformer secondary output (12), (13) end shunt capacitance C 5After, positive terminating diode D 1, D 1Be connected to inductance L then 2, diode D 2Forward termination (13) end, D 2Oppositely termination (14) is held, capacitor C 6Last termination (14) end, following termination (13) end, inductance L 2Output termination (17) end, capacitor C 9Last termination (17) end, C 9Following terminating resistor R 52Left end, capacitor C 8Last termination (17) end, C 8Lower end ground connection, capacitor C 7Upper end ground connection, C 7Following termination R 22Left end, R S2The right side meets lead-out terminal (16), R S2Right-hand member meets voltage-stabiliser tube Z 1, Z 1Following termination IC 1(6) end of B meets R simultaneously 5The lower end, R 5Last termination (17) end, R 2Last termination (17), R 2Following termination IC 1B (5) end, R 1Last termination (16) end, following termination IC 1B (5) end, R 6Last termination IC 1B (5) end, following termination VoulAdlust, ic chip 1B (7) termination luminous tube IC 2L2, IC 2L2 output (21) connects PWM (C) input (8), ic chip 1(3) termination (16) end of A, (2) termination R 3The lower end, R 3Last termination R S2Left end, R 4Last termination IC 1(2) end of A, R 4Following termination IC 1(6) end of B, IC 1(1) termination IC of A 2The l1 input is from IC 2L1 output (22) meets the input (9) of (PWM) C, optocoupler pipe IC 2L1 and IC 2The emitter of l2 connects the source electrode of switching tube G jointly.
Fig. 3: V1 goes into from (3) termination, and first branch road is: R 7Left end connects (3) end, and right-hand member meets IC 3A in-phase end (3), R 8Left end connects V1 (3) end, and right-hand member meets voltage-stabiliser tube Z 2And IC 3A (2) end, resistance R 9Last termination IC 3A (3) end, lower end ground connection, IC 3A (1) terminating diode D 3, D 3Negative pole meets diode D 4Negative pole.
Second branch road is: resistance R 10Left end meets V1 input terminal (3), R 10Right-hand member connecting resistance R 11R 11Lower end ground connection, R 11And R 10Meet IC 3B (5) end, IC 3B (6) termination IC 3A (2) end, IC 3B (7) termination D 4Anode, D 4Negative terminal meets PWMOFF (5), (5) end in PWMOFF (5) map interlinking 2.
The 3rd branch road R 12Left end meets V1 input (3) end, R 12Right-hand member connects capacitor C 10, C 10Lower end ground connection, C 10Meet IC 3C (9) end, IC 3C (10) termination IC 3B (6) end meets R simultaneously 13The upper end, R 13Following termination R 14Right-hand member, IC 3C (8) termination D 5Anode, D 5Negative terminal meets PWLIMIT (6).
The 4th branch road: Iover (4) meets IC 3D (12) end, R 14Left end ground connection, right-hand member meets IC 3D (13) end, IC 3D (14) termination D 6Positive pole, D 6Negative pole connects PWMLIMIT (6) end, (6) end among PWMLIMIT (6) termination Fig. 2, (4) end in Iover (4) map interlinking 2.
Referring to Fig. 1; from (1); (2) end input direct voltage 24-72V; filter the High-frequency Interference pulse through filter A; pass through overvoltage again; under-voltage; current-limiting protection circuit B; start pulse width modulator (PWM) C work; output drive signal (18) is to switching tube G and resonance absorbing circuit D; the switching voltage that is produced by switching tube G is through transformer F; arrive power conversion secondary; secondary pulses voltage is through rectification; filtering unit H; obtain the low ripple VD of high stable, externally power supply, the stable of output voltage controlled by voltage stabilizing function parts I; parts I possesses overvoltage simultaneously; short circuit; overcurrent protection, this parts output signal control pulse width modulator PWMC forms a closed feedback loop.
In pulse width modulator (PWM) C part, external remote control end (7) is arranged, but the ON/OFF of remote-control switch DC-DC inverter power supply output.
Voltage stabilizing function parts I has external output voltage fine setting end (Vout Adjust).
Embodiment: referring to Fig. 2, Fig. 3.
The input power supply is from terminal (1) V+ and (2) V-input, through C 1/ C 2Elimination common mode noise, terminal (d) the shell ground of meeting sb. at the airport is again through C 3/ L 1/ C 4Elimination high frequency differential mode noise, the noise that makes external power and switch DC-DC converter are after mutual the isolation, again to switch DC-DC converter power supply.
Enter from (3), (4) end through filtered power supply, at first, see Fig. 3 by overvoltage, under-voltage, current-limiting protection circuit B detection.This circuit comprises: resistance R 7, R 8, R 9, voltage stabilizing didoe Z 2, integrated package LM324 the IC of first 3: A, diode D 3, resistance R 10, R 11, LM324 second portion IC 3: B, diode D 4Form control PWM OFF (5) (pass) branch road; Resistance R 12R 13, R 14Capacitor C 10, LM324 third part IC 3: C, diode D 5PWM LIMT (6) the maximal input restriction branch road of forming, the 4th part IC of LM324 3: D, diode D 6The control pulsewidth branch road of forming.D 3-D 6Select IN414B for use, the course of work is as follows:
If voltage is in 24-27V scope, IC then 3: A, IC 3: B exports a high level signal, and by PWM OFF (5) output, control (PWM) C quits work; If voltage is in 24-27V scope, then (5) output low level does not influence the PWM operate as normal, when start, by slow start circuit IC 3: C, up voltage is slowly gone up in output one, and the pulsewidth of control (PWM) C output increases gradually, avoids the impulse current of starting shooting, during work, if because the circuit partial fault (as short circuit etc.) cause that primary return electric current I over is at Rs 1When last pressure drop surpasses certain value, by IC 3 iD exports a high level, limits its output by PWM LIMIT (6) output signal control (PWM) C and drives pulsewidth, and the unlikely overcurrent of protection switch pipe G damages.
Core component (PWM) C of work is a pulse width modulator, is subjected to five road input signals (5), (6), (7), (8), (9) control, wherein:
(7) end is external remote control end Remite (remote control), and when this end input-low level, PWM quits work;
(8) end connects voltage stabilizing function parts I, connects IC 2/ 2 and the IC of LM358 1: B, to be exported voltage stabilizing and controlled, voltage is by resistance R 2, R 5From the sampling of (17) end;
(9) end connects IC 2/ 1 and the IC of LM358 1: A, controlled by output overcurrent, current sampling is by resistance R S 2, terminal (16) sampling.
(PWM) C output (10) connects resonance absorbing circuit D, and (18) termination main switch G makes the pulse voltage that reaches 1MHz at the elementary formation switching frequency of transformer F, and transformer is output as (12), (13) end.
The output pulse current is at (12)/(13) end, through C 5Sponge the high frequency spike, by diode D 1Rectification forms DC pulse, C 6Absorb spike, through inductance L 2To C 9Charging powers to the load simultaneously, forms output voltage U out, diode D 2For when switch ends, through inductance L 2To the fly-wheel diode of Uout power supply, C 7/ C 8Be output common mode noise filter capacitor, its ground end d and input front end capacitor C 1/ C 2Ground connection d end link to each other.
Output end voltage Vout is through resistance R 1/ R 2Dividing potential drop is input to LM358IC 1: the in-phase end 5 of B, its anti-phase termination reference level Vref, Vref meets voltage-stabiliser tube Z 1And resistance R 5, when Vout ↑ time, IC 1: the 5 terminal voltage V+ of B ↑, output 7 is a high level, optocoupler pipe IC 2/ 2 is bright, through IC 2(2) end output (PWM) C voltage stabilizing input (8), the control pulsewidth ↓, make (18) end output voltage pulsewidth ↓, transformer F (12), (13) end output voltage pulsewidth ↓, DC-DC converter output terminal (17) voltage ↓.Output current I 0Through Rs 2Form overcurrent sample voltage, end is input to LM358 IC through (16) 1: A in-phase input end 3, end of oppisite phase 2 connecting terminals (20), (20) are divider resistance R 3/ R 4Mid point is as resistance R s 2Last electric current I 0During greater than the setting output current, IC 1: A end output high level, through optocoupler pipe IC 2/ 1, IC 2/ 1 is bright, and the overcurrent control end (9) that is input to (PWM) C by 22 ends carries out pulse-width modulation, and (18) terminal voltage pulsewidth is descended, and (12) of transformer F, (13) terminal voltage pulsewidth descend.Optocoupler pipe IC 2/ 1, IC 2/ 2 adopt the TLP5221-2 model.
Switch DC of the present utility model-DC converter; operating frequency reaches 1MHz; perfect input, output, overcurrent, short-circuit protection function are arranged; remote circuit ON/OFF terminal is arranged, finely tune output voltage ± 10% outward, it exports river in Shangdong Province ripple≤20mVp-p; adopt hybrid integrated circuit technology; volume is little, in light weight, reliability is high, according to the external volume size design of standard, is applicable to be installed in and makes Switching Power Supply on the stored-program control exchange.

Claims (2)

1. switch DC-DC converter. it is characterized by: the input termination (1) of filter A; (2) power supply terminal; output is taken over pressure; under-voltage; the input of current-limiting protection circuit B (3); (4); from B (5); (6) end is attached to (PWMC); PWMC output (18) connects switching tube G grid; switching tube G source ground; drain electrode meets transformer F elementary (11); another output of PWMC is connected to resonance absorbing circuit D; resonance absorbing circuit D output is connected to transformer F primary coil; transformer secondary output (12); (13) be connected to filtering unit H; by filtering unit H output termination power output terminal (17); (16); filtering unit two samplings in addition is connected to voltage stabilizing function parts 1 input; by 1 output (22); (22) be connected to (PWM) C input (8); (9), form closed feedback loop.
2, according to the switch DC-DC converter of claim 1, it is characterized by: power supply V +Input terminal (1) connects capacitor C 1, power supply V -Input terminal connects capacitor C 2, C 1, C 2Other end d ground connection, capacitor C 3Be parallel to (1), (2) end, choke L 1Elementary input (1), the L of being series at 1Secondary input (2), the L of being series at 1The input of following termination B (4), secondary input (3), the capacitor C that meets B 4Be parallel to input (3), (4) of B, be connected to (PWM) C from (5), (6) end of B, grid level from (PWM) C output termination switching tube G, the switching tube source ground, drain electrode connects transformer F elementary (11) end, (PWM) another output of C (10) is connected to resonance absorbing circuit D, and resonance absorbing circuit D output is connected to transformer F primary coil upper end, transformer secondary output (12), (13) end shunt capacitance C 5After, positive terminating diode D 1, D 1Be connected to inductance L then 2, diode D 2Forward termination (13) end, D 2Oppositely termination (14) is held, capacitor C 6Last termination (14) end, following termination (13) end, inductance L 2Output termination (17) end, capacitor C 9Last termination (17) end, C 9Following terminating resistor R S2Left end, capacitor C 8Last termination (17) end, C 8Lower end ground connection, capacitor C 7Upper end ground connection, C 7Following termination R S2Left end, R S2The right side meets lead-out terminal (16), R S2Right-hand member meets voltage-stabiliser tube Z 1, Z 1Following termination IC 1(6) end of B meets R simultaneously 5The lower end, R 5Last termination (17) end, R 2Last termination (17), R 2Following termination IC 1B (5) end, R 1Last termination (16) end, following termination IC 1B (5) end, R 6Last termination IC 1B (5) end, following termination VoutAdlust, ic chip 1B (7) termination luminous tube IC 2L2, IC 2L2 output (21) connects PWM (C) input (8), ic chip 1(3) termination (16) end of A, (2) termination R 3The lower end, R 3Last termination R S2Left end, R 4Last termination IC 1(2) end of A, R 4Following termination IC 1(6) end of B, IC 1(1) termination IC of A 2The l1 input is from IC 2L1 output (22) meets the input (9) of (PWM) C, optocoupler pipe IC 2L1 and IC 2The emitter of l2 connects the source electrode of switching tube G jointly.Overvoltage, under-voltage, current-limiting protection circuit PtVl go into from (3) termination, and first branch road is: R 7Left end connects (3) end, and right-hand member meets IC 3A in-phase end (3), R 8Left end connects V1 (3) end, and right-hand member meets voltage-stabiliser tube Z 2And IC 3A (2) end, resistance R 9Last termination IC 3A (3) end, lower end ground connection, IC 3A (1) terminating diode D 3, D 3Negative pole meets diode D 4Negative pole;
Second branch road is: resistance R 10Left end meets V1 input terminal (3), R 10Right-hand member connecting resistance R 11R 11Lower end ground connection, R 11And R 10Meet IC 3B (5) end, IC 3B (6) termination IC 3A (2) end, IC 3B (7) termination D 4Anode, D 4Negative terminal meets PWMOFF (5), (5) end in PWMOFF (5) map interlinking 2;
The 3rd branch road R 12Left end meets V1 input (3) end, R 12Right-hand member connects capacitor C 10, C 10Lower end ground connection, C 10Meet IC 3C (9) end, IC 3C (10) termination IC 3B (6) end meets R simultaneously 13The upper end, R 13Following termination R 14Right-hand member, IC 3C (8) termination D 5Anode, D 5Negative terminal meets PWMLIMIT (6);
The 4th branch road: Iover (4) meets IC 3D (12) end, R 14Left end ground connection, right-hand member meets IC 3D (13) end, IC 3D (14) termination D 6Positive pole, D 6Negative pole connects PWMLIMIT (6) end.
CN 94229924 1994-11-28 1994-11-28 Switch DC-DC inverter Expired - Fee Related CN2225109Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 94229924 CN2225109Y (en) 1994-11-28 1994-11-28 Switch DC-DC inverter

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Application Number Priority Date Filing Date Title
CN 94229924 CN2225109Y (en) 1994-11-28 1994-11-28 Switch DC-DC inverter

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CN2225109Y true CN2225109Y (en) 1996-04-17

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060894C (en) * 1996-11-25 2001-01-17 三星电子株式会社 Forward converter
CN100399664C (en) * 2003-07-04 2008-07-02 三星电子株式会社 Power circuit protection apparatus
CN100495877C (en) * 2002-03-18 2009-06-03 英特塞尔美国公司 DC-to-DC converter with fast overload feedback control
CN1897429B (en) * 2005-07-14 2011-05-25 半导体元件工业有限责任公司 Single pin multi-function signal detection method and structure therefor
CN101577492B (en) * 2008-05-07 2011-06-15 群康科技(深圳)有限公司 Power supply circuit
CN104078940A (en) * 2014-06-11 2014-10-01 京东方科技集团股份有限公司 Secondary power system and power supply device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1060894C (en) * 1996-11-25 2001-01-17 三星电子株式会社 Forward converter
CN100495877C (en) * 2002-03-18 2009-06-03 英特塞尔美国公司 DC-to-DC converter with fast overload feedback control
CN100399664C (en) * 2003-07-04 2008-07-02 三星电子株式会社 Power circuit protection apparatus
CN1897429B (en) * 2005-07-14 2011-05-25 半导体元件工业有限责任公司 Single pin multi-function signal detection method and structure therefor
CN101577492B (en) * 2008-05-07 2011-06-15 群康科技(深圳)有限公司 Power supply circuit
CN104078940A (en) * 2014-06-11 2014-10-01 京东方科技集团股份有限公司 Secondary power system and power supply device
US9722411B2 (en) 2014-06-11 2017-08-01 Boe Technology Group Co., Ltd. Secondary power system and power supply device

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C19 Lapse of patent right due to non-payment of the annual fee
CF01 Termination of patent right due to non-payment of annual fee