CN202455590U - High-power intelligent LED power supply driver with innovative framework - Google Patents
High-power intelligent LED power supply driver with innovative framework Download PDFInfo
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- CN202455590U CN202455590U CN2011204998023U CN201120499802U CN202455590U CN 202455590 U CN202455590 U CN 202455590U CN 2011204998023 U CN2011204998023 U CN 2011204998023U CN 201120499802 U CN201120499802 U CN 201120499802U CN 202455590 U CN202455590 U CN 202455590U
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Abstract
The utility model relates to a high-power intelligent LED power supply driver with an innovative framework. The high-power intelligent LED power supply driver with the innovative framework comprises an EMI (Electro-Magnetic Interference) filter circuit, a rectification circuit, a power factor correcting circuit, an LLC (Logical Link Control) resonant converter control circuit, a rectifying filter circuit, a current sampling feedback circuit, an overvoltage and undervoltage protecting circuit, an LED module and a PWM (Pulse Width Modulation) dimming control circuit of a singlechip, wherein the power factor correcting circuit and the LLC resonant converter control circuit are used as a main topological structure of the circuit, and are combined with singlechip control to achieve the LED digital dimming control. According to the high-power intelligent LED power supply driver with the innovative framework, in the innovative framework, a plurality of strings of expensive high-tension DC/DC step-down transformers are omitted and replaced by the LLC resonant converter control circuit consisting of a plurality of transformers connected in series, the constant current is achieved directly; the efficiency is greatly improved to 95%, which is about 10% higher than that of a conventional framework; the PFC (Power Factor Correction) value can reach 0.95 to 1.0; the amount of the components is greatly reduced; the reliability is promoted; and the EMI design is simpler and particularly suitable for the high-power LED driving lighting power supply.
Description
Technical field
The utility model invention relates to a kind of high-power LED driving power source, relates in particular to the high-power LED driving power source that adopts the LLC series resonant converter chip with innovation framework.
Background technology
Along with energy crisis and climate warming problem are more and more serious, energy-conservation oneself through becoming the topic of global common concern.Illumination is the importance of the human consumption energy, accounts for 20% of the total power consumption in the world, so the research of LED energy-saving illumination more and more comes into one's own, and oneself becomes the focus that lighting field is paid close attention to the LED illumination.The LED driving power plays crucial effects in the LED illuminator, be the heart of LED illuminator.According to incompletely statistics, the damage of LED illuminator have 90% be the LED driving power lost efficacy with or cause by the LED driving power, the quality of driving power directly influences the life-span and the reliability of whole LED illuminator.It is a key issue of popularizing and promoting of LED illumination.
As far as the high-power LED illumination driving power mainly is efficient and reliability problems.At first; Driving power operating ambient temperature very high (general temperature about 70 ℃), so, that the efficient of just hoping the efficient (comprising that constant voltage adds constant current) of driving power is wanted is high (such as 90%); Only raise the efficiency the temperature that could reduce driving power, improve reliability.Secondly, the traditional driving topological structure is comparatively complicated, as can beappreciated from fig. 1 the traditional driving topological structure; The syllogic framework that comprises power factor correction (PFC)+constant voltage (CV)+constant current (CC); Many string Buck (buck circuit)+PFC+LLC cause the numerous costs of number of chips and components and parts too high, and reliability is low; Sensitive Apparatus such as electrochemical capacitor and optocoupler particularly, gross efficiency only can reach about 88%.Solve high-power LED illumination circuit reliability problem, must improve, raise the efficiency, reduce component number, also can further reduce cost in addition from driving topological structure.
On the traditional high-power LED illumination Organization Chart of Fig. 1, can see; It has two Block; First Block is the constant voltage module, obtains the output of a constant voltage after DC/DC comes out, and second is constant flow module; Constant flow module is that every string LED can need DC/DC to boost or the circuit of step-down, and each string LED is carried out constant current.This is the topological structure that traditional typical great power LED drives.The efficient of this topological structure is distributed as: the maximum of critical conduction mode PFC is about 97%; In the industry cycle we assert than higher LLC resonance oscillation semi-bridge efficient at present; The chances are 96% for its efficient; Efficient behind each string constant-current decompression is about 95%, and three gross efficiencys that multiply each other (representative value) should be in 86%.The shortcoming of conventional topologies framework, at first its cost is very high, because it has PFC, LLC circuit, also has many string high pressure Buck buck chopper DC/DC circuit, and high pressure Buck buck chopper DC/DC circuit cost is very high, and each string all needs one.With the LED street lamp is example, and present LED road-light light-source is actually by 4-12 string LED lamps to be formed, and that is to say that you need the high pressure Buck buck chopper DC/DC circuit of 4-12 strings, and this just needs very many devices.The secondth, efficient is very low, and the 3rd is the non-constant of reliability, and last also is very important one, and the EMI problem of this conventional architectures is also very serious.Because each string high pressure Buck buck chopper DC/DC contactor frequency does not carry out synchronously mutual interference being arranged between string and string.
The utility model content
To the problem that prior art exists, the purpose of the utility model is the high-power LED illumination driving power that provides a kind of twin-stage to go here and there the transformer framework more, have simple in structure, efficient is high, the advantage that cost is low.
In order to address the above problem; The technical scheme of the utility model is: a kind of twin-stage is gone here and there the high-power LED illumination driving power of transformer framework shown in accompanying drawing more, comprises EMI filter circuit (1), rectification circuit (2); Power factor correction circuit (3); LLC resonant transformation control circuit (4), current rectifying and wave filtering circuit (5) current sample feedback circuit (7), over-and under-voltage testing circuit (8) LED module (9) and PWM adjusting control circuit (6).Electric main is input power factor correcting circuit (3) behind EMI filter circuit, rectification circuit (2); Power factor correction circuit (3) output signal is through LLC resonant transformation control circuit (4); Be connected to LED module (9) after passing through current rectifying and wave filtering circuit (5) again; LLC resonant transformation control circuit (4) in feeding back to after current sample feedback circuit (7) is sampled to output; Over-and under-voltage testing circuit (8) detects and sends into the voltage signal of LED module (9) and send into LLC resonant transformation control circuit (4), and PWM adjusting control circuit (6) output pwm signal is controlled lamplight brightness to the PWM input of LLC resonant transformation control circuit (4).
The effect of said EMI filter circuit is mainly reflected in following two aspects: the High-frequency Interference in the inhibition AC network is to the influence of equipment; Suppression equipment (especially high frequency switch power) is to the interference of AC network.
Said power factor correction circuit is realized entire circuit Active PFC function.
Said LLC resonant transformation control circuit is realized the resonant transformation function.
Said EMI filtering, power factor correction circuit are as shown in Figure 3: F1 imports insurance; L1, L2, C1, C2 form the input electromagnetic interface filter; L3, IC1, Q1 etc. have formed the PFC power factor correction circuit; R1 and R2 voltage after partial value are sent into 3 pin of IC1, and 4 pin of IC1 are used for the transient current size of basic MOSFET pipe; One of L3 terminates to 5 pin of IC1, and the transformer zero energy of sensing (TZE) is sent into, and the grid of the 7 pin output control MOSFET pipe of IC1 is controlled its conducting and shutoff.IC1 is through the detection of 3 pairs of AC input voltages of pin, and the value after R5, the R6 dividing potential drop is delivered to 1 pin of IC1, is used for overvoltage protection.2 pin of IC1 are the output of mutual conductance error amplifier, and loop compensation capacitor C 4 connects between pin and the ground therewith.4 pin of IC1 detect the instant shut-in electric current of external switch.
Said LLC resonant transformation control circuit comprises drive circuit, half-bridge circuit resonant electric capacity; Also comprise plural transformer; The elementary winding of said two above transformers adopts series system from beginning to end; Said two above Secondary winding of transformer then connect current rectifying and wave filtering circuit respectively, behind rectifying and wave-filtering, to load power supply are provided respectively.
Described half-bridge circuit comprises first high-voltage MOS pipe (QA) and second high-voltage MOS pipe (QB); The elementary winding of said two above transformers adopts the series system mid point that is connected serially to the half-bridge circuit of first high-voltage MOS pipe (QA) and second high-voltage MOS pipe (QB) formation from beginning to end, through resonant capacitance ground connection.
Described LLC resonant transformation control circuit comprises transformer (T1), transformer (T2), transformer (Tn), capacitor C F, CG; Said transformer (T1), transformer (T2), transformer (Tn) secondary winding are connected with rectifier bridge heap Z1, Z2, Zn and filter capacitor (CA), (CB), (Cn) respectively; They provide power supply to load respectively; Load is a LED lamp module.
The utlity model has following characteristics:
Adopting power factor correction circuit and LLC resonant transformation control circuit is circuit main body topological structure, the digital dimming of LED is controlled with realization in conjunction with Single-chip Controlling.
Described great power LED intelligent power driver with innovation framework; The PFC control circuit adopts American TI chip UCC28810 (IC1) to be achieved; LLC resonant transformation control circuit adopts American TI Company chip UCC25710 (IC2) to be achieved, and single-chip microcomputer then adopts PIC16F22 (IC3).
Described great power LED intelligent power driver with innovation framework; The human-computer dialogue circuit of being made up of button and potentiometer changes the output pwm signal duty ratio through single-chip microcomputer; Utilize 9 pin of the 12 pin output pwm signals of single-chip microcomputer PIC16F22, realize the light modulation of LED to the UCC25710 chip.
Described great power LED intelligent power driver with innovation framework; Supply power to single-chip microcomputer PIC16F722 after adopting IC4 SPX1117M3-3.3 voltage stabilizing IC unit voltage stabilizing; Produce the variable pwm pulse of duty ratio of 500HZ by PIC16F722; The PWM digital signal outputs to 9 pin of UCC25710 chip, the sample voltage of 0 ┉ 3.3V of the RA0 mouth of single-chip microcomputer PIC16F722, the pwm pulse duty ratio of the RC1 pin output of modulation single-chip microcomputer PIC16F722.
Great power LED intelligent drives power supply with innovation framework also has overvoltage, overcurrent, overload, short circuit and overheat protector; Light modulation able to programme; Soft start able to programme, switching frequency are freely set (precision is 3% ┉ 6%), wide input voltage range: 90V ┉ 305V, wide environment for use temperature: plurality of advantages such as-35 ℃ of ┉+70 ℃.High efficiency: machine system design efficiency (EFF) is between 90% ┉ 92%; High Power Factor: PFC power factor: the PFC value then can reach between 0.95 ┉ 1.0; Wide region light modulation: the dimming scope that can support 1% ┉ 100%.Compare with the existing led drive circuit in market, the utility model invention has high power factor, high efficiency, high reliability, advantage such as with an automatic light meter, is fit to produce in batches.
Description of drawings
Fig. 1 is traditional high-power LED driving power source block architecture diagram
Fig. 2 is the LLC series resonant converter high-power LED driving power source block architecture diagram with innovation framework
Fig. 3 is LLC series resonant converter high-power LED driving power source EMI and the pfc circuit sketch with innovation framework
Fig. 4 is a PWM output circuit sketch
Fig. 5 is under-voltage, overvoltage, current-limiting protection circuit sketch
Fig. 6 is the LLC series resonant converter electrical schematic diagram with innovation framework
Fig. 7 is a microprocessor PWM output circuit sketch
Fig. 8 is a microprocessor PWM output software flow chart.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model invention is clearer, below in conjunction with accompanying drawing and instance, invention is further elaborated to the utility model.Should be appreciated that specific embodiment described herein only in order to the invention of explanation the utility model, and be not used in the invention of qualification the utility model.
Said EMI filtering, power factor correction circuit are as shown in Figure 3: F1 imports insurance; L1, L2, C1, C2 form the input electromagnetic interface filter; L3, IC1, Q1 etc. have formed power factor correction circuit; R1 and R2 voltage after partial value are sent into 3 pin of IC1, and as the input of current reference, 4 pin of IC1 are used for the transient current size of basic MOSFET pipe; One of L3 terminates to 5 pin of IC1, and the transformer zero energy of sensing (TZE) is sent into, and makes its circuit have the function of ZVT.The grid of the 7 pin output control MOSFET pipe of IC1 is controlled its conducting and shutoff.IC1 can force peak switch current to follow the tracks of the variation of input voltage through the detection of 3 pairs of AC input voltages of pin, thereby improves the system power factor.Value after R5, the R6 dividing potential drop is delivered to 1 pin of IC1, is used for overvoltage protection.2 pin of IC1 are the output of mutual conductance error amplifier.When it is lower than 2.3 V, zero energy consumption detection comparator is activated, thereby prevents the gate driving output of switch.Loop compensation capacitor C 4 connects between pin and the ground therewith.4 pin of IC1 detect the instant shut-in electric current of external switch, if V
ISENSESurpass the output of 1.7 V terminating switches.Instant shut-in current threshold voltage approximates V
ISENSE=0.67 x (V
EAOUTOne 2.5 V) x (V
VINS+ 75 m V), integrated circuit die I C1 is UCC28810.
Fig. 4 is a PWM output circuit sketch, and the integrated circuit die I C2 among the figure is UCC25710.Its 6 pin output pwm control signal, Q1 and Q2 form compound promotion level and are used to promote Q
3Metal-oxide-semiconductor, RE one terminates at Q
3In the drain electrode of metal-oxide-semiconductor, the other end is connected on 16 pin of IC2, is used to detect the electric current that supervision is input to LED lamp module.Q
3The source electrode of metal-oxide-semiconductor links to each other with LED lamp module, changes Q through PWM
3Thereby the metal-oxide-semiconductor control utmost point reaches the size of current that changes LED lamp module realizes light modulation.
Fig. 5 is under-voltage, overvoltage, current-limiting protection circuit sketch, and IC2 is UCC25710 among the figure.Its 2 pin (GD1) and 3 pin (GD2) are gate driving output signals:
Lgd=VCC/2*?Fsw*87mA
In the formula: Lgd driving grid transformer current
Fsw nominal switching frequency
The VCC supply voltage
Its 6 pin output pwm control signal; Its 9 pin receive the pwm control signal from single-chip microcomputer output; Its 5 pin are reference voltages, take out CREF voltage through R1, R2 dividing potential drop and send into 15 pin, the current reference value when keeping watch on the electric current that is input to LED lamp module as detection.11 pin (UV) are to be used for keeping watch on the load low-voltage, when being lower than VUVTH (under-voltage threshold) pin level, will forbid gate drivers output and LEDSW output.Low-voltage detection input terminal will detect voltage and send into the bleeder circuit of being made up of R3, R4, after dividing potential drop, send into 11 pin,
R
3=R
6-R
4
R4=R6/5
R11=（R3+R4）*2.4V/Vovlo-2.4V-Vd
In the formula: Vovlo: the overvoltage thresholding
Vd: total LED pressure drop
This pin of 12 pin (OV) is to be used for keeping watch on LED lamp module overvoltage.When being higher than VOVTH (overvoltage threshold) pin level, will forbid gate drivers output and LEDSW output.Overvoltage detection input terminal will detect voltage and send into the bleeder circuit of being made up of R5, R6, after dividing potential drop, send into 12 pin;
R5=（2*Vout*1.5）/Iout*Dmin*Imatch
In the formula: the Vout:LED series voltage
The Iout:LED electric current
Dmin: descend the light modulation duty ratio most
The Imatch:LED electric current
R6=(R5*2.6V)/(Vovlo-2.6v-Vd)
In the formula: Vovlo: the overvoltage thresholding
Vd: total LED pressure drop
The input current that 13 pin (CL) are used to detect the LLC transducer is connected the rectification and the filtering output of principal current sensor transformer and sees Fig. 6.The threshold value that surpasses 1.9 V, the disabled and LEDSW step-down of gate drivers, this situation is latched, and is lower than threshold value up to VCC and just understands release.18 pin (SS) are the soft start control pins, are connected to the capacitor C 10 decision soft-start times on ground.
Fig. 6 is the LLC series resonant converter electrical schematic diagram with innovation framework; In Fig. 6, can see by the first high-voltage MOS pipe QA, the second high-voltage MOS pipe QB, CF, CQ, T1, T2 ┉ TN and constitute the LLC series resonant converter; The drive signal of the first high-voltage MOS pipe QA, second high-voltage MOS pipe QBMOSFET pipe is input to the control utmost point of QA, two MOSFET pipes of QB through driving transformer LA from GD1, GD1; VIN+ and VIN-are the positive-negative input ends of direct-current working volts, and transformer (T1), transformer (T2), transformer (Tn) secondary winding are connected with rectifier bridge heap Z1, Z2, Zn and filter capacitor (CA), (CB), (Cn) respectively; Their output provides power supply to load respectively; Load is a LED lamp module.Diode D1, D2, D3, D4, Dn, Dn ＇ are connected power output end and are used to detect the under-voltage of power supply and overvoltage signal; UV (under-voltage signal output part) and OU (overvoltage signal output part) deliver to UV (under-voltage signal input part) and the OU (overvoltage signal input part) among Fig. 5, and the IC2 chip is made corresponding judgment processing according to sending into signal.The input current that (CL) is used to detect the LLC transducer among Fig. 6 is connected the rectification and the filtering output of principal current sensor transformer; It is as shown in Figure 5 that this signal is sent into 13 pin of IC1 chip; If this numerical value surpasses the threshold value of 1.9 V, gate drivers is with disabled and make the LEDSW step-down, and this situation is latched always; Be lower than threshold value up to VCC and just understand release, circuit has been carried out limited protection.
Fig. 7 is the PWM output circuit sketch of single-chip microcomputer PIC16F722; Single-chip microcomputer PIC16F722 is circumscribed with button S1, S2, S3, S4 and potentiometer W1; Button S1, S2, S3, S4 insert RB0, RB3, RB4, the RB5 mouth of single-chip microcomputer PIC16F722 respectively; Potentiometer inserts the RA0 mouth of single-chip microcomputer PIC16F722; Fig. 7 can find out that the 6V DC power supply supplies power to single-chip microcomputer PIC16F722 after IC4 SPX1117M3-3.3 voltage stabilizing IC unit voltage stabilizing, and by the variable pwm pulse of duty ratio of PIC16F722 generation 500HZ, the PWM digital signal outputs to 9 pin of UCC25710; The input of Fig. 7 button is connected to RB5, RB4, RB3, the RB0I/O mouth of single-chip microcomputer PIC16F722; The sample voltage of 0 ┉ 3.3V of the RA0 mouth of single-chip microcomputer PIC16F722, the pwm pulse duty ratio of the RC1 pin output of modulation single-chip microcomputer PIC16F722, Key1 ┉ dimmer switch among Fig. 7; Key2 ┉ blast; Key3 ┉ subtracts secretly; Key4 ┉ potentiometer/touch is regulated button and is regulated selector switch.
Fig. 8 is the SCM PWM software flow pattern, The software adopted C language.
Claims (2)
1. the great power LED intelligent power driver with innovation framework comprises EMI filter circuit (1); Rectification circuit (2); Power factor correction circuit (3); LLC resonant transformation control circuit (4), current rectifying and wave filtering circuit (5) current sample feedback circuit (7), over-and under-voltage testing circuit (8) LED module (9) and PWM adjusting control circuit (6); Electric main is input power factor correcting circuit (3) behind EMI filter circuit (1), rectification circuit (2); Power factor correction circuit (3) output signal is through LLC resonant transformation control circuit (4); Be connected to LED module (9) after passing through current rectifying and wave filtering circuit (5) again; Current sample feedback circuit (7) feeds back to LLC resonant transformation control circuit (4) after output is sampled; Over-and under-voltage testing circuit (8) detects and sends into the voltage signal of LED module (9) and send into LLC resonant transformation control circuit (4), and PWM adjusting control circuit (6) output pwm signal is controlled lamplight brightness to the PWM input of LLC resonant transformation control circuit (4).
2. the great power LED intelligent power driver with innovation framework according to claim 1 comprises plural output transformer, and the elementary winding of said two above transformers adopts the series system mid point that is connected serially to the half-bridge circuit of first high-voltage MOS pipe (QA) and second high-voltage MOS pipe (QB) formation from beginning to end; The elementary winding of said two above transformers adopts series system from beginning to end, and said two above Secondary winding of transformer then connect current rectifying and wave filtering circuit respectively, behind rectifying and wave-filtering, to load power supply are provided respectively.
3. the great power LED intelligent power driver with innovation framework according to claim 1; Be to have adopted that power factor correction circuit and LLC resonant transformation control circuit are arranged is the topological structure of circuit main body, in conjunction with Single-chip Controlling to realize digital dimming control to LED; Power factor correction circuit has adopted the UCC28810 chip; LLC resonant transformation control circuit has adopted chip UCC25710; Single-chip microcomputer then adopts PIC16F22.
4. the great power LED intelligent power driver digital light-adjusting circuit with innovation framework according to claim 1 has adopted the PIC16F22 single-chip microcomputer; SPX1117M3-3.3 voltage stabilizing IC unit output 3.3V direct voltage provides stable direct-current working volts for single-chip microcomputer PIC16F22; Single-chip microcomputer PIC16F722 produces the variable pwm pulse of duty ratio of 500HZ, and this pwm signal is sent into 9 pin of UCC25710; The voltage of the RA0 mouth sampling 0-3.3V of single-chip microcomputer PIC16F722, the pwm pulse duty ratio of the RC1 pin output of modulation single-chip microcomputer PIC16F722.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103025009A (en) * | 2012-11-29 | 2013-04-03 | 余姚亿威电子科技有限公司 | Light-emitting diode (LED) driving control circuit |
| CN103152896A (en) * | 2011-12-06 | 2013-06-12 | 重庆瑞升康博电气有限公司 | High-power lighting emitting diode (LED) intelligent power source actuator with innovative framework |
| CZ305489B6 (en) * | 2013-04-22 | 2015-10-29 | Varroc Lighting Systems, s.r.o. | Pulse-switched controller for LED lighting of LED power supply module of lighting fixtures in automobile applications provided light sources with LED and power supply module of LED function and excitation |
| CN105323930A (en) * | 2015-11-13 | 2016-02-10 | 余塘 | LED dimming constant-current drive circuit |
| CN105934043A (en) * | 2016-06-28 | 2016-09-07 | 重庆灿源电子有限公司 | Lamp control system |
| CN106332372A (en) * | 2016-10-18 | 2017-01-11 | 威海金丰电子有限公司 | Area array LED rail transit vehicle illuminating lamp with PWM dimming function |
| CN106793349A (en) * | 2017-03-21 | 2017-05-31 | 惠州桑尼伟太阳能科技有限公司 | The protection circuit of booting moment impact overvoltage |
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| CN103152896A (en) * | 2011-12-06 | 2013-06-12 | 重庆瑞升康博电气有限公司 | High-power lighting emitting diode (LED) intelligent power source actuator with innovative framework |
| CN103025009B (en) * | 2012-11-29 | 2015-09-09 | 余姚亿威电子科技有限公司 | A kind of LED Drive and Control Circuit |
| CN103025009A (en) * | 2012-11-29 | 2013-04-03 | 余姚亿威电子科技有限公司 | Light-emitting diode (LED) driving control circuit |
| CZ305489B6 (en) * | 2013-04-22 | 2015-10-29 | Varroc Lighting Systems, s.r.o. | Pulse-switched controller for LED lighting of LED power supply module of lighting fixtures in automobile applications provided light sources with LED and power supply module of LED function and excitation |
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| CN105323930B (en) * | 2015-11-13 | 2018-01-09 | 余塘 | LED dims constant-current drive circuit |
| CN105323930A (en) * | 2015-11-13 | 2016-02-10 | 余塘 | LED dimming constant-current drive circuit |
| CN105934043A (en) * | 2016-06-28 | 2016-09-07 | 重庆灿源电子有限公司 | Lamp control system |
| CN105934043B (en) * | 2016-06-28 | 2017-08-04 | 珠海灿源电子科技有限公司 | A kind of lamp control system |
| CN106332372A (en) * | 2016-10-18 | 2017-01-11 | 威海金丰电子有限公司 | Area array LED rail transit vehicle illuminating lamp with PWM dimming function |
| CN106332372B (en) * | 2016-10-18 | 2017-11-07 | 威海金丰电子有限公司 | Face matrix LED rail traffic vehicles illuminator with PWM dimming functions |
| CN106793349A (en) * | 2017-03-21 | 2017-05-31 | 惠州桑尼伟太阳能科技有限公司 | The protection circuit of booting moment impact overvoltage |
| CN107592073A (en) * | 2017-09-12 | 2018-01-16 | 电子科技大学 | A kind of acceleration test apparatus for solar cell Study on output characteristic |
| CN107592073B (en) * | 2017-09-12 | 2019-03-29 | 电子科技大学 | A kind of acceleration test apparatus for solar battery Study on output characteristic |
| CN108377099A (en) * | 2018-04-23 | 2018-08-07 | 顺德职业技术学院 | A kind of twin-stage input step-up DC constant pressure output translator |
| CN108377099B (en) * | 2018-04-23 | 2023-06-16 | 顺德职业技术学院 | Two-stage input boost DC constant voltage output converter |
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Address after: 400039 Chongqing Jiulongpo Branch City Road No. 71 Erlang Students Pioneer Park building D1 10F Patentee after: Chongqing Ruisheng Kangbo Electrical Co., Ltd. Address before: Jiulongpo Branch Park four road 400039 Chongqing City No. 166 block C 3F Patentee before: Chongqing Ruisheng Kangbo Electrical Co., Ltd. |
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