CN205319940U

CN205319940U - Increment DCDC converter

Info

Publication number: CN205319940U
Application number: CN201520990585.6U
Authority: CN
Inventors: 徐华; 何曙光; 朱艳平; 陈星�
Original assignee: SHENZHEN HUAJIE ELECTRICAL TECHNOLOGY Co Ltd
Current assignee: SHENZHEN HUAJIE ELECTRICAL TECHNOLOGY Co Ltd
Priority date: 2015-12-03
Filing date: 2015-12-03
Publication date: 2016-06-15
Anticipated expiration: 2025-12-03

Abstract

The utility model relates to an increment DCDC converter belongs to DC source voltage transform technical field. If DC power supply's voltage is higher, partly voltage of desirable this DC power supply carries out the DCDC transform, and supplies power to the power consumption utensil behind that partly DC power supply voltage forward superposition of not alternateing. This technique can be used to photovoltaic generation of electricity by new energy, ACDC transform etc. But at data center, subway lamp house advertisement specific applications. The utility model discloses an increment DCDC converter, the circuit is simple, both can use current integrated circuit, also need not select higher overpressure resistant power component, and seriation commodity module is convenient for make into by the cost is reduced, practice has proved and still having improved circuit conversion efficiency, the reliability also can strengthen.

Description

A kind of increment DC/DC changer

Technical field

This utility model is a kind of increment DC/DC changer, belongs to direct current power source voltage converter technique field. If the voltage of DC source is higher, a part of voltage of this DC source desirable carries out DC/DC conversion, powers to consuming device with after that non-transformed part of direct current source voltage forward superposition. This technology can be used for Photovoltaic new energy generating, AC/DC conversion etc., and the heart, lamp box advertisement etc. all can be applied in the data.

Background technology

Direct current power source voltage conversion custom is called that DC/DC converts, particularly small-power, low voltage DC/DC converter technique are very ripe, for simplifying circuit design, businessman is proposed a lot of integrated circuit, these integrated circuits are generally pressure not high, general only 30 ~ 40 volts, individual other pressure can reach 70 volts, but price is significantly high. DC/DC for high voltage converts, for instance more than 100 volts, and these integrated circuits are easily punctured by high voltage and cannot use. Though can all adopt discrete component to design DC/DC translation circuit, but choose higher pressure power component and other components and parts also can increase cost. Need to seek a kind of new circuit design to solve this problem.

Summary of the invention

This utility model takes a part of voltage of DC source and carries out DC/DC conversion, such as this portion voltage is limited in less than 30 ~ 40 volts, then still can use the integrated circuit that businessman releases, with have neither part nor lot in that part of direct current source voltage forward superposition of conversion after power to consuming device. If that part of direct current source voltage to have neither part nor lot in DC/DC conversion makees basis, this portion voltage participating in DC/DC conversion is regarded as " increment " voltage, then this utility model can called after " increment DC/DC conversion ".

Of the present utility model it is characterized by: this increment DC/DC changer, the DC source that voltage is higher can be carried out voltage transformation, the a part of voltage taking this DC source carries out DC/DC conversion, powers to consuming device with after that non-transformed a part of voltage forward superposition.

1), the DC source Uin carrying out DC/DC conversion must draw a target (2), only this portion voltage U1 between positive pole (1) and the target (2) of this DC source Uin participates in DC/DC conversion, and using target (2) as DC/DC translation circuit Zero potential reference;This DC/DC translation circuit is prior art, can adopt existing integrated circuit or all adopt discrete component to design; And the part voltage U2 between the negative pole (3) of target (2) and this DC source Uin is not involved in DC/DC conversion. The positive pole that positive pole output (6) after DC/DC conversion is output voltage Uout, the negative pole (3) of this DC source Uin is also the negative pole of output voltage Uout.

2), must be connected across on output voltage Uout after sample resistance R4 and resistance R5 series connection, dividing potential drop on resistance R5 is as sampling voltage, just reflecting the change of output voltage Uout, the output voltage after could being converted by DC/DC rises with the part voltage U2 forward superposition being not involved in DC/DC conversion and is used as output voltage Uout.

3), the control circuit except DC/DC translation circuit is formed by PNP triode V1, resistance R1 ~ R5 and load resistance RL, stabilivolt VD1, three end adjustable precision voltage reference N1, its purpose seeks to obtain a control point (4), is connected with the feedback control of DC/DC translation circuit point FB. Concrete connected mode is: the emitter stage of PNP triode V1 connects the voltage output end (6) after DC/DC conversion, the colelctor electrode of audion V1 connects one end of resistance R1, the other end of resistance R1 connects target (2), and the colelctor electrode of audion V1 and the junction point (4) of resistance R1 connect the feedback control point FB of DC/DC translation circuit; One end of resistance R2 connects the voltage output end (6) after DC/DC conversion, the other end of resistance R2 connects one end of resistance R3, the base stage of series connection node (5) the connecting triode V1 of resistance R2 and resistance R3, the other end of resistance R3 connects the negative pole of stabilivolt VD1, the positive pole of stabilivolt VD1 connects the negative electrode K pin of three end adjustable precision voltage reference N1, and the anode A pin of three end adjustable precision voltage reference N1 connects the negative pole (3) of DC source B1; One end of resistance R4 connects the voltage output end (6) after DC/DC conversion, and the other end of resistance R4 connects one end of resistance R5, and the series connection node (7) of resistance R4 and resistance R5 connects the reference R pin of three end adjustable precision voltage reference N1. One end of load RL connects the voltage output end (6) after DC/DC conversion, and the other end of load RL connects the negative pole (3) of DC source B1.

The increment DC/DC changer of this utility model design, circuit is simple, both can use existing integrated circuit, it is not required that choose higher pressure power component, reduce cost, it is simple to be fabricated to seriation merchandise module; Facts have proved and also improve circuit transformations efficiency, reliability is also enhanced. Needing D.C. regulated power supply to power typically by electrical device, also have minority to need direct current constant current-supplying (such as LED lamp), these adopt " increment DC/DC conversion " to be all easily achieved.

Accompanying drawing explanation

Fig. 1 is the increment DC/DC changer schematic diagram of the DC supply input of this utility model design.

Fig. 2 is the increment DC/DC changer schematic diagram of the electric main input of this utility model design.

Fig. 3 is one embodiment of increment DC/DC changer that this utility model adopts integrated circuit XL6010, voltage stabilizing output.

Detailed description of the invention

Explain accompanying drawing below in conjunction with embodiment and invention place of the present utility model is described.

Fig. 1 be this utility model design with DC source B1 input increment DC/DC changer schematic diagram, this " DC source " B1 can be accumulator or photovoltaic cell, and it is composed in series by multiple element cells. Wherein (1) end is the positive pole of DC source B1, and (3) end is the negative pole of DC source B1, and (2) end is the electrode that the series connection node of certain two element cell is drawn from DC source B1, and this electrode agreement is called " target ".If (1), the voltage at (2) two ends be U1, the voltage at (2), (3) two ends is U2, and as shown on Fig. 1, then the voltage of DC source B1 is Uin=U1+U2.

When doing increment DC/DC conversion, only voltage U1 participates in conversion, and voltage U2 is not involved in conversion. The value of voltage U1 to obtain relatively low, for instance less than 30 ~ 40 volts, so just can use the integrated circuit that businessman releases.

Square frame A in Fig. 1 represents the physical circuit of DC/DC conversion, and it can adopt existing integrated circuit, it is also possible to is all adopt discrete component to design DC/DC translation circuit, owing to it is prior art, here represents with a square frame A. The DC/DC that square frame A represents converts physical circuit, has a Zero potential reference, and this Zero potential reference is the target (2) of DC source B1, therefore square frame A has a wire connecing target (2); Additionally controlling the voltage stabilization after DC/DC conversion, square frame A has also drawn feedback control point " FB ". The DC/DC that square frame A represents converts physical circuit, and its power supply is inputted by the positive pole (1) of B1, and the voltage output end after DC/DC conversion is (6).

In addition in Fig. 1, remaining circuit is technical characteristic of the present utility model, the mode of concrete connection is: the emitter stage of PNP triode V1 connects the voltage output end (6) after DC/DC conversion, the colelctor electrode of audion V1 connects one end of resistance R1, the other end of resistance R1 connects target (2), and the colelctor electrode of audion V1 and the junction point (4) of resistance R1 connect the feedback control point FB of DC/DC translation circuit; One end of resistance R2 connects the voltage output end (6) after DC/DC conversion, the other end of resistance R2 connects one end of resistance R3, the base stage of series connection node (5) the connecting triode V1 of resistance R2 and resistance R3, the other end of resistance R3 connects the negative pole of stabilivolt VD1, the positive pole of stabilivolt VD1 connects the negative electrode K pin of three end adjustable precision voltage reference N1, and the anode A pin of three end adjustable precision voltage reference N1 connects the negative pole (3) of DC source B1; One end of resistance R4 connects the voltage output end (6) after DC/DC conversion, and the other end of resistance R4 connects one end of resistance R5, and the series connection node (7) of resistance R4 and resistance R5 connects the reference R pin of three end adjustable precision voltage reference N1. One end of load RL connects the voltage output end (6) after DC/DC conversion, and the other end of load RL connects the negative pole (3) of DC source B1.

The element being numbered N1 is TL431, is three end adjustable precision voltage references, and this element has negative electrode K, anode A and reference tri-pins of R. By diagram connection, it is U from the negative electrode K voltage obtained_KA=2.5 [1+(R4/R5)] volt. Increase a stabilivolt VD1 to be to aid in N1 element TL431 and can bear high voltage.

This circuit operation principle is as follows: the voltage output end (6) after a termination DC/DC conversion of resistance R4, the negative pole (3) of the one termination DC source B1 of resistance R5, end points (6) and end points (3) are exactly the output voltage Uout two ends after forward superposition, the positive pole that wherein end points (6) is this output voltage Uout, the negative pole that end points (3) is this output voltage Uout. By the sampling voltage obtaining output voltage Uout after resistance R4 and resistance R5 dividing potential drop, sampling voltage is drawn from the series connection node (7) of resistance R4 and resistance R5.

Because being connected across on output voltage Uout after resistance R4 and resistance R5 series connection, the dividing potential drop on resistance R5 is as sampling voltage, and it reflects the change of output voltage Uout.If the voltage of the voltage output end (6) after DC/DC conversion rises, then sampling voltage also can rise, compare with the bandgap voltage reference (this voltage is 2.5 volts) within N1 element TL431, the current potential making the negative electrode K of N1 element TL431 reduces, so that the base current of PNP triode V1 increases [this base current is by the emitter stage of end points (6) → V1 → resistance R3 → stabilivolt VD1 → N1 element TL431 → end points (3)], the collector current causing audion V1 increases, this collector current flows through resistance R1, voltage drop on resistance R1 is also increased, namely it is that the voltage of the series connection node (4) of the colelctor electrode of audion V1 and resistance R1 rises, (4) the feedback control point FB of DC/DC translation circuit it is connected to, DC/DC translation circuit perceives the voltage of feedback control point FB and rises, the voltage of voltage output end (6) will be automatically adjusted so as to decline, otherwise if the voltage of the voltage output end (6) after DC/DC conversion declines, DC/DC translation circuit also will be automatically adjusted the voltage of voltage output end (6) so as to rise, and reaches voltage stabilizing purpose.

Fig. 2 is the increment DC/DC changer schematic diagram of the electric main input of this utility model design. Former limit two ends IN1 and the IN2 being used herein Industrial Frequency Transformer T1, T1 connects electric main, and transformator T1 has two vice-side winding L1 and L2. Vice-side winding L1 obtains DC voltage U1, vice-side winding L2 by rectifier bridge VC1 rectification and electric capacity C1 filtering and obtains DC voltage U2 by rectifier bridge VC2 rectification and electric capacity C2 filtering. Wherein DC voltage U1 participates in DC/DC conversion, DC voltage U2 is not involved in DC/DC conversion, just extremely (1) of DC voltage U1, the negative pole of DC voltage U2 is (3), is connected by the positive pole of the negative pole of DC voltage U1 with DC voltage U2 as target (2). Remaining circuit is identical with Fig. 1, and circuit operation principle repeats no more.

If using existing integrated circuit to do DC/DC conversion, when inputting pure DC source, supply voltage is just passable less than 30 ~ 40 volts; It is noted that alternating voltage typically refers to virtual value, and the voltage obtained after rectification, filtering is peak value, it is also contemplated that the spread of voltage of electric main, maximum possible has ± and the change of 20%. If making power supply with electric main, for the sake of assurance, then the alternating voltage of vice-side winding L1 is less than 16.9 ~ 22.6 volts.

Fig. 3 is one embodiment of increment DC/DC changer that this utility model adopts integrated circuit XL6010, voltage stabilizing output, and it makes power supply with photovoltaic cell B1, just extremely (1) of B1, and negative pole is (3), and target is (2). What in broken box, DC/DC conversion adopted is that " SEPIC " circuit topology is recommended by manufacturer, is characterized in that the DC/DC output voltage Uout converted both can be higher than input voltage Uin, it is also possible to lower than input voltage Uin. IC chip N01(XL6010 in broken box), needed for electric capacity C01 ~ C05, the element such as coupling inductance T01, diode VD01 be this " SEPIC " circuit. DC/DC conversion in whole broken box is all using target (2) as Zero potential reference, grounding pin " GND " including integrated circuit XL6010 is also connected to target (2), the colelctor electrode of feedback control pin " FB " connecting triode V1 and the series connection node (4) of resistance R1. Audion V1, resistance R1 ~ R5 and load resistance RL, stabilivolt VD1, three end adjustable precision voltage reference N1 connected mode all identical with Fig. 1, Fig. 2.

The above, it it is only preferably enforcement example of the present utility model, not utility model is done any pro forma restriction, any those skilled in the art are changed or are modified to the Equivalent embodiments of equivalent variations possibly also with the technology contents of the disclosure above, but it is every without departing from technical solutions of the utility model content, any simple modification, equivalent variations and modification above example made according to technical spirit of the present utility model, all still falls within technical solutions of the utility model category.

Claims

1. an increment DC/DC changer, can carry out voltage transformation to the DC source that voltage is higher, it is characterised in that: a part of voltage taking this DC source carries out DC/DC conversion, powers to consuming device with after that non-transformed a part of voltage forward superposition;

1) the DC source Uin carrying out DC/DC conversion is provided with a target (2), this portion voltage U1 between positive pole (1) and the target (2) of described DC source Uin participates in DC/DC conversion, and using target (2) as DC/DC translation circuit Zero potential reference; And the part voltage U2 between the negative pole (3) of target (2) and this DC source Uin is not involved in DC/DC conversion; Positive pole output (6) after DC/DC conversion is connected with the positive pole of output voltage Uout, and the negative pole (3) of described DC source Uin is connected with the negative pole of output voltage Uout;

2) control circuit except DC/DC translation circuit is formed by PNP triode V1, resistance R1 ~ R5 and load resistance RL, stabilivolt VD1, three end adjustable precision voltage reference N1; Concrete connected mode is: the emitter stage of PNP triode V1 connects the voltage output end (6) after DC/DC conversion, the colelctor electrode of audion V1 connects one end of resistance R1, the other end of resistance R1 connects target (2), and the colelctor electrode of audion V1 and the junction point (4) of resistance R1 connect the feedback control point FB of DC/DC translation circuit; One end of resistance R2 connects the voltage output end (6) after DC/DC conversion, the other end of resistance R2 connects one end of resistance R3, the base stage of series connection node (5) the connecting triode V1 of resistance R2 and resistance R3, the other end of resistance R3 connects the negative pole of stabilivolt VD1, the positive pole of stabilivolt VD1 connects the negative electrode K pin of three end adjustable precision voltage reference N1, and the anode A pin of three end adjustable precision voltage reference N1 connects the negative pole (3) of DC source B1; One end of resistance R4 connects the voltage output end (6) after DC/DC conversion, and the other end of resistance R4 connects one end of resistance R5, and the series connection node (7) of resistance R4 and resistance R5 connects the reference R pin of three end adjustable precision voltage reference N1; One end of load RL connects the voltage output end (6) after DC/DC conversion, and the other end of load RL connects the negative pole (3) of DC source B1.