CN204258636U - A kind of small-sized DC inputs ultralow ripple switch power supply - Google Patents
A kind of small-sized DC inputs ultralow ripple switch power supply Download PDFInfo
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- CN204258636U CN204258636U CN201420504419.6U CN201420504419U CN204258636U CN 204258636 U CN204258636 U CN 204258636U CN 201420504419 U CN201420504419 U CN 201420504419U CN 204258636 U CN204258636 U CN 204258636U
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Abstract
The utility model provides a kind of small-sized DC and inputs ultralow ripple switch power supply, comprising: the input filter connected successively, and surge places restrictions on circuit, input accumulator, power conversion circuit, current rectifying and wave filtering circuit and reduction voltage loop; Wherein, surge places restrictions on the controller U7 that circuit comprises voltage stabilizing didoe Q3 and triode Q6, the CAT660 type be connected with input filter, the amplifier U8 be connected with controller U7, and is arranged on the triode Q9 between triode Q6 and controller U7; Input accumulator comprises electric capacity C47 in parallel and electric capacity C38; Power conversion circuit comprises transformer T2; Current rectifying and wave filtering circuit comprises the chip U2 of LM5026 type; Reduction voltage loop comprises the chip U57 of LT8614 type.The small-sized DC that the utility model provides inputs ultralow ripple switch power supply and has circuit design rationally, and protection is reliable rapidly, and working stability, efficiency is high, the advantage that volume is little.
Description
Technical field
The utility model relates to power technique fields, particularly relates to a kind of small-sized DC and inputs ultralow ripple switch power supply, exports for converting direct current input to stable direct current.
Background technology
In airborne equipment, the equipment of low ripple power supply can be provided based on linear power supply, but the shortcomings such as conversion efficiency that linear power supply exists transformer is low, voltage stabilizing chip pressure reduction large, filter circuit is perfect not, occur that output ripple is large, efficiency is low, caloric value increases the problems such as noise to the system of use linear power supply greatly, indirectly often.
In addition, the existing equipment of low ripple power supply that can provide is comparatively heavy, and the efficiency comparison that small-sized DC as an alternative inputs ultralow ripple switch power supply is high, and volume is little, lightweight, but ripple is larger.
Utility model content
The technical problems to be solved in the utility model is: the ripple that existing small-sized DC inputs ultralow ripple switch power supply is comparatively large, affect the normal work of load, and noise also can be caused excessive and transship.
In order to solve the problems of the technologies described above, the technical solution of the utility model is as follows:
A kind of small-sized DC inputs ultralow ripple switch power supply, and comprising: the input filter connected successively, surge places restrictions on circuit, input accumulator, power conversion circuit, current rectifying and wave filtering circuit and reduction voltage loop; Wherein, input filter comprises electric capacity C2, electric capacity C3 in parallel, electric capacity C4 and electric capacity C37, and is arranged on the inductance L 1 between electric capacity C2 and C3; Surge places restrictions on the controller U7 that circuit comprises voltage stabilizing didoe Q3 and triode Q6, the CAT660 type be connected with input filter, the amplifier U8 be connected with controller U7, and is arranged on the triode Q9 between triode Q6 and controller U7; Input accumulator comprises electric capacity C47 in parallel and electric capacity C38; Power conversion circuit comprises transformer T2; Current rectifying and wave filtering circuit comprises the chip U2 of LM5026 type; Reduction voltage loop comprises the chip U57 of LT8614 type.
In preferred scheme, described small-sized DC inputs ultralow ripple switch power supply and also comprises for providing the galvanic elementary accessory power supply of 12V, the diode D12 that elementary accessory power supply comprises secondary inductance L2B and is connected with secondary inductance L2B.
In preferred scheme, described small-sized DC inputs ultralow ripple switch power supply and also comprises the voltage sampling circuit be connected with chip U57, voltage sampling circuit comprises the resistance R54 and resistance R55 that link together, and resistance R54 and resistance R55 is connected to amplifier U3 by resistance R51.
In preferred scheme, described small-sized DC inputs ultralow ripple switch power supply and also comprises the output filter circuit be connected with chip U57, output filter circuit comprises electric capacity C147, electric capacity C136 in parallel and electric capacity C141, and the differential mode inductance LA3 be connected with electric capacity C147.
A kind of small-sized DC that the utility model provides inputs ultralow ripple switch power supply and has circuit design rationally, and protection is reliable rapidly, and working stability, efficiency is high, the advantage that volume is little.
Accompanying drawing explanation
Fig. 1 be the small-sized DC of the utility model embodiment input ultralow ripple switch power supply open up complement;
Fig. 2 shows the circuit diagram that small-sized DC of the present utility model inputs input filter circuit in ultralow ripple switch power supply;
Fig. 3 shows small-sized DC of the present utility model and inputs surge in ultralow ripple switch power supply and place restrictions on the circuit diagram of circuit;
Fig. 4 shows small-sized DC of the present utility model and inputs the circuit diagram inputting accumulator and power conversion circuit in ultralow ripple switch power supply;
Fig. 5 shows the circuit diagram that small-sized DC of the present utility model inputs power conversion circuit in ultralow ripple switch power supply;
Fig. 6 shows the circuit diagram that small-sized DC of the present utility model inputs elementary accessory power supply in ultralow ripple switch power supply;
Fig. 7 shows the circuit diagram that small-sized DC of the present utility model inputs voltage sampling circuit in ultralow ripple switch power supply;
Fig. 8 shows the circuit diagram that small-sized DC of the present utility model inputs reduction voltage loop in ultralow ripple switch power supply;
Fig. 9 shows the circuit diagram that small-sized DC of the present utility model inputs output filter circuit in ultralow ripple switch power supply.
Embodiment
Below in conjunction with accompanying drawing, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Present embodiments provide a kind of small-sized DC and input ultralow ripple switch power supply, as shown in Fig. 1-Fig. 9, comprising: the input filter connected successively, surge places restrictions on circuit, input accumulator, power conversion circuit, current rectifying and wave filtering circuit and reduction voltage loop; Wherein, input filter comprises electric capacity C2, electric capacity C3 in parallel, electric capacity C4 and electric capacity C37, and is arranged on the inductance L 1 between electric capacity C2 and C3; Surge places restrictions on the controller U7 that circuit comprises voltage stabilizing didoe Q3 and triode Q6, the CAT660 type be connected with input filter, the amplifier U8 be connected with controller U7, and is arranged on the triode Q9 between triode Q6 and controller U7; Input accumulator comprises electric capacity C47 in parallel and electric capacity C38; Power conversion circuit comprises transformer T2; Current rectifying and wave filtering circuit comprises the chip U2 of LM5026 type; Reduction voltage loop comprises the chip U57 of LT8614 type.
Input filter as shown in Figure 2, the spike adopting the mode filtering power conversion circuit HF switch of π type filtering to produce and interference, reduce reflected ripple current, thus the interference reduced to prime when small-sized DC inputs ultralow ripple switch power work, make the work that circuit is reliable and stable, wherein to inductance L 1 select slightly large, the wave energising that may occur to make reduction is pressed in the gradient that rear class rises.Fig. 3 is that surge voltage places restrictions on circuit, and wherein diode Q3 and prime filter circuit form transient peak suppress current jointly, dominant absorption high pressure, low-energy impact.The circuit of controller U7 and its periphery forms a charge pump circuit, normal work for triode Q6 provides a bias voltage, diode D14 is used for the driving voltage of clamped live in triode Q6, ensure that triode Q6 is no more than 15VDC, this circuit is when inputting normal, triode Q6 works in opening state, and conduction voltage drop is minimum, and the conducting internal resistance primarily of triode Q6 produces.When wave lead to reach time, worked by amplifier U8 and make triode Q6 work in magnifying state, thus placing restrictions on the destruction of surge voltage to late-class circuit.This circuit design can bear the impact of 75VDC surge voltage 50mS, and between impact epoch, rear class power conversion does not quit work, thus provides a reliable condition of work for rear class.And this circuit can suppress power-on surge current, alleviate prime power supply burden.
See Fig. 4, electric capacity C47, C38 and prime C44 form input accumulator jointly, and wherein, the X7R electric capacity C47 of high-quality, in order to reduce HF switch due to voltage spikes during work, reduces the operating temperature rise of electrochemical capacitor.Ensure the long-life of power supply.Power conversion circuit adopts normal shock active clamped.Clamp circuit is made up of jointly electric capacity C5 and switching tube Q7, this power position is different from common upper clamp circuit, have employed lower clamped, for reducing circuit complexity and save printed board space, master switch portion adopts prestige generation novel switched pipe, coordinate active clamp circuit, switching power loss can be dropped to a lower level, through tabling look-up, transformer T2 adopts EE18 magnetic core, the power of 150W can be exported at the switching frequency of 300K, the application of circuit can be ensured.Secondary rectification and fly-wheel diode adopt Schottky diode.Resistance R183, electric capacity C110 and resistance R22, resistance R33, resistance R24, electric capacity C6 form absorbing circuit, reduce spike during two diode switch conversion.Export energy storage inductor and adopt EE18 type magnetic core, this larger magnetic core is selected to ensure larger sensibility reciprocal, reduces the first-harmonic part of output ripple.Output filter capacitor adopts aluminium electroloysis and X7R electric capacity jointly to form, and with the multistage ripple of the common filtering of inductance L 2A, thus makes output ripple keep a lower level.Diode D20 is utilized to form the accessory power supply of a 25VDC by another winding.Electric capacity C89, electric capacity C39, electric capacity C40 form common mode filtering circuit jointly, with the spike on the common filtering output voltage of rear class.
See Fig. 5, pulse width modulation (PWM) adopts the control chip LM5026 with international most advanced level, the auxiliary electrical source generating circuit that LM5026 is inner integrated, there is outside fan-out capability, whole power supply startup stage, input and flowed into by chip 1 pin through resistance R34, exported the power supply of a 7.5VDC by chip 7 pin.Resistance R12, resistance R32, resistance R27 form biasing circuit jointly, ensure that chip is blocked in normal working conditions, resistance R31, resistance R61, electric capacity C2 form timing circuit jointly, make circuit working under 300K frequency, and set driver output and work in lower clamped mode.R62, for setting the Dead Time driven with clamped driving, is set to 500 μ S here.Current transformer T1B utilizes resistance R181 to form a triangle wave voltage, input chip tripod, and when output overcurrent, chip tripod voltage raises, and is detected locking and exports, restart chip by internal circuit.This circuit makes LM5026 chip when using less device, can realize overcurrent protection accurately, even if when rear class is damaged, also ensure power safety, prevent the expansion of damage envelope.The photoelectricity coupling of OT1 primary and secondary feedback, for the isolation of control loop.
Signal F is from over-temperature protection node, and when power supply excess temperature, F is low level state, and locking chip exports, the safety of protection power source.Signal O is from under-voltage circuit.When failure condition occurs, this signal presents low level state, and locking chip exports, and ensures power safety.
In preferred scheme, described small-sized DC inputs ultralow ripple switch power supply and also comprises for providing the galvanic elementary accessory power supply of 12V, the diode D12 that elementary accessory power supply comprises secondary inductance L2B and is connected with secondary inductance L2B.
See Fig. 6, elementary accessory power supply is produced by secondary inductance L2B, and between the afterflow period, inductance assists Motor Winding Same Name of Ends to be high, drives diode D12 conducting, produces the voltage of a 12VDC, for elementary.
Elementary under-voltage protecting circuit is made up of diode U1 and peripheral circuit; input voltage is detected by resistance R4, resistance R25, resistance R182; when input undervoltage, diode U1 detects that under-voltage condition exports a low level through diode D4 degrade signal O; this signal is sent to main control chip, and locking chip exports.The normal bias of diode U1 under resistance R6 is used for providing a normal condition to diode U1.Triode Q1 is for the formation of a under-voltage return difference of 3.5VDC input voltage.Under-voltagely be set to 13VDC to 16VDC.
Thermal-shutdown circuit adopts special chip, and when chip detection power module temperature reaches 105 DEG C, signal F is set low, and LM5026 is blocked, and when temperature return to 90 DEG C, F is reset, and LM5026 recovers normal.
In preferred scheme, described small-sized DC inputs ultralow ripple switch power supply and also comprises the voltage sampling circuit be connected with chip U57, voltage sampling circuit comprises the resistance R54 and resistance R55 that link together, and resistance R54 and resistance R55 is connected to amplifier U3 by resistance R51.
See Fig. 7, for the output voltage control of first order translation circuit, wherein diode U4 is for the formation of 2.5DC voltage reference.Resistance R54, resistance R55 detect output voltage, and output voltage is set as 18V+.Electric capacity C23, electric capacity C21, resistance R47 are used for setup control loop parameter.Triode Q8, electric capacity C20, resistance R44 form soft circuit.
See Fig. 8, reduction voltage circuit adopts LT8614, and this chip insults the control chip that Li Erte aims at the exploitation of low ripple circuit, and inner embedding power switch, peripheral circuit is simple.Through tabling look-up, exporting boost inductance and adopting ELI14.5.The power of exportable more than 80W.Wherein resistance R49 is about 500K for setting main switch frequency.Electric capacity C243 is for setting the rate of rise of output voltage.Resistance R58, resistance R56 are 12VDC for setting output voltage.Electric capacity C242 is used for the speed of accelerating system loop, makes output can the change of responsive load fast.Electric capacity C244, electric capacity C245, electric capacity C246, electric capacity C247, for forming multistage filter circuit, make output ripple less.
In preferred scheme, described small-sized DC inputs ultralow ripple switch power supply and also comprises the output filter circuit be connected with chip U57, output filter circuit comprises electric capacity C147, electric capacity C136 in parallel and electric capacity C141, and the differential mode inductance LA3 be connected with electric capacity C147.
See Fig. 9, for reducing output ripple, exporting and having added one-level common mode filtering circuit, exporting spine with the filtering of prime common mode filtering electric capacity.Electric capacity C147, electric capacity C136, electric capacity C141 and leakage inductance LA3 form secondary filtering circuit jointly, again reduce first-harmonic and the spike of output voltage.
These are only preferred embodiment of the present utility model, not in order to limit the utility model, all do within spirit of the present utility model and principle any amendment, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (4)
1. small-sized DC inputs a ultralow ripple switch power supply, it is characterized in that, comprising: the input filter connected successively, and surge places restrictions on circuit, input accumulator, power conversion circuit, current rectifying and wave filtering circuit and reduction voltage loop; Wherein, input filter comprises electric capacity C2, electric capacity C3 in parallel, electric capacity C4 and electric capacity C37, and is arranged on the inductance L 1 between electric capacity C2 and C3; Surge places restrictions on the controller U7 that circuit comprises voltage stabilizing didoe Q3 and triode Q6, the CAT660 type be connected with input filter, the amplifier U8 be connected with controller U7, and is arranged on the triode Q9 between triode Q6 and controller U7; Input accumulator comprises electric capacity C47 in parallel and electric capacity C38; Power conversion circuit comprises transformer T2; Current rectifying and wave filtering circuit comprises the chip U2 of LM5026 type; Reduction voltage loop comprises the chip U57 of LT8614 type.
2. a kind of small-sized DC according to claim 1 inputs ultralow ripple switch power supply, it is characterized in that, also comprise for providing the galvanic elementary accessory power supply of 12V, the diode D12 that elementary accessory power supply comprises secondary inductance L2B and is connected with secondary inductance L2B.
3. a kind of small-sized DC according to claim 1 inputs ultralow ripple switch power supply, it is characterized in that, also comprise the voltage sampling circuit be connected with chip U57, voltage sampling circuit comprises the resistance R54 and resistance R55 that link together, and resistance R54 and resistance R55 is connected to amplifier U3 by resistance R51.
4. a kind of small-sized DC according to claim 1 inputs ultralow ripple switch power supply, it is characterized in that, also comprise the output filter circuit be connected with chip U57, output filter circuit comprises electric capacity C147, electric capacity C136 in parallel and electric capacity C141, and the differential mode inductance LA3 be connected with electric capacity C147.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420504419.6U CN204258636U (en) | 2014-09-03 | 2014-09-03 | A kind of small-sized DC inputs ultralow ripple switch power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420504419.6U CN204258636U (en) | 2014-09-03 | 2014-09-03 | A kind of small-sized DC inputs ultralow ripple switch power supply |
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| CN204258636U true CN204258636U (en) | 2015-04-08 |
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| CN201420504419.6U Expired - Fee Related CN204258636U (en) | 2014-09-03 | 2014-09-03 | A kind of small-sized DC inputs ultralow ripple switch power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391286A (en) * | 2015-11-06 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | High-pass-platform-based power supply circuit |
| CN112532033A (en) * | 2020-11-27 | 2021-03-19 | 江西百盈高新技术股份有限公司 | Inverter with anti-surge suppression function |
| CN106921303B (en) * | 2017-03-13 | 2023-08-11 | 深圳市安姆伯科技有限公司 | Switching power supply transformer |
-
2014
- 2014-09-03 CN CN201420504419.6U patent/CN204258636U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105391286A (en) * | 2015-11-06 | 2016-03-09 | 上海斐讯数据通信技术有限公司 | High-pass-platform-based power supply circuit |
| CN105391286B (en) * | 2015-11-06 | 2018-05-01 | 上海斐讯数据通信技术有限公司 | A kind of power-supplying circuit based on high-pass platform |
| CN106921303B (en) * | 2017-03-13 | 2023-08-11 | 深圳市安姆伯科技有限公司 | Switching power supply transformer |
| CN112532033A (en) * | 2020-11-27 | 2021-03-19 | 江西百盈高新技术股份有限公司 | Inverter with anti-surge suppression function |
| CN112532033B (en) * | 2020-11-27 | 2022-09-13 | 江西百盈高新技术股份有限公司 | Inverter with anti-surge suppression function |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150408 Termination date: 20190903 |
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| CF01 | Termination of patent right due to non-payment of annual fee |