CN2523106Y

CN2523106Y - DC-DC switching power source commutator

Info

Publication number: CN2523106Y
Application number: CN 02215498
Authority: CN
Inventors: 洪伟弼
Original assignee: New Focus Lighting and Power Technology Shanghai Co Ltd
Current assignee: New Focus Lighting and Power Technology Shanghai Co Ltd
Priority date: 2002-01-31
Filing date: 2002-01-31
Publication date: 2002-11-27
Anticipated expiration: 2012-01-31

Abstract

A direct current-direct current switch power converter comprises a cover body 6 and a circuit board 5 positioned in the cover body, wherein, the circuit board 5 is provided with a power input end 51 and a power output end 53. The utility model is characterized in that the circuit board 5 is additionally provided with a controlling circuit 54 and a main circuit 52 which are connected through circuits; the main circuit 52 is provided with a switch tube 521 which is controlled by an output power level of the controlling circuit 54 and an energy conservation inductance 522 which is connected with an output pole of the switch tube 521. The DC-DC switch power converter of the technical proposal has small volume, light weight, easy carrying and use and the functions of input under voltage protection, over current protection, short circuit protection and power indication, etc. and has adjustable output power and easier use.

Description

The DC-DC switch power source transducer

Technical field

The utility model relates to a kind of switch power converter, relates in particular to a kind of employing high frequency pulse width control technology, and high direct current is directly changed into low galvanic switch power converter.

Background technology

Existing power source conversion adopts Industrial Frequency Transformer mostly, and is bulky, and loss is big, portably uses inconvenience, and the transducer that adopts high frequency is also arranged, but because its loss is big, is not used more widely.

Summary of the invention

Technical problem to be solved in the utility model provides a kind of high frequency and the little DC-DC switch power source transducer of loss.

The utility model is achieved in that described DC-DC switch power source transducer, comprise housing, wiring board, wherein wiring board is provided with input and output, it is characterized in that, also be provided with the control circuit and the main circuit that are connected with circuit on the described wiring board, the field effect transistor that this main circuit is provided with the output level control of controlled circuit reaches the energy storage inductor that is connected with the drain electrode of field effect transistor.

By the DC-DC switch power converter of technique scheme structure, little, in light weight, the use that is easy to carry of volume, and have functions such as input under-voltage protection, overcurrent protection, short-circuit protection, power indication, and can regulate power output, use convenient.

Description of drawings

Fig. 1 is a cutaway view of the present utility model.

Fig. 2 is an output panel of the present utility model.

Fig. 3 is an input panel of the present utility model.

Fig. 4 is circuit theory diagrams of the present utility model.

Embodiment

As shown in Figure 1: a kind of DC-DC switch power source transducer of the present utility model, comprise housing 6, two binding posts 2 that pass housing 6 and be connected with wiring board 5 by output cathode line 3, output negative pole line 4, incoming line 7, cigar tip cigarette lighter socket 1 pass housing 6 and link to each other with wiring board 5.

As shown in Figure 2 be output panel 9 of the present utility model, this panel 9 is provided with five indicator lights 8.

As shown in Figure 3 be input panel 11 of the present utility model, this panel 11 is provided with fuse 10, micelle 12 and switch 13.

As shown in Figure 4 be the circuit theory diagrams of wiring board of the present utility model: comprise the power input 51 that is connected with circuit, main circuit 52, power output end 53, control circuit 54, input overvoltage, under-voltage protecting circuit 55, power display circuit 56.

Main circuit 52 is provided with a field effect transistor 521, one energy storage inductor 522 that joins with the drain electrode of field effect transistor 521, when 24 volts of direct currents are exported with 12 volts of direct currents commonly used behind energy storage inductor 522 through source electrode to its drain electrode of field effect transistor 521 from input again, the source electrode of field effect transistor 521 and the conducting of drain electrode with close the control that is subjected to grid voltage, when being the grid high potential, field effect transistor 521 conductings, electric current is able to flow to energy storage inductor 522 from 24 volts of ends, flow to 12 volts of outputs again, when if grid is in electronegative potential, field effect transistor 521 is closed, the electric current supply of input 51 is cut off, this moment, energy storage inductor 522 discharged the energy of its storage to continue to keep the size and Orientation of former incoming current like this because the electric current in the energy storage inductor 522 can not be changed in quality.

Described control circuit 54 comprises output voltage sample circuit 541 and the control impuls integrated circuit 542 that is connected with circuit successively, the sampling end 5423 of output voltage sample circuit 541 joins with the pin 16 of control impuls integrated circuit 542, the other end of output voltage sample circuit 541 and power output end 53 join, and the output of control impuls integrated circuit 542 links to each other with the grid of field effect transistor 521.The working condition of described control impuls integrated circuit 542 is as follows, and its pin 11 produces control pulsewidths so that the conducting of control field effect transistor 521 and closing under the normal condition.Pin 1 and pin 2 constitute a comparator, operate as normal when promptly having only pin 1 voltage to be lower than pin 2 voltages, otherwise will turn-off pin 11.Same pin 15 also constitutes a comparator with pin 16, and control impuls integrated circuit 542 can be regulated the high-low level duty ratio of pin 11 output driving pulses according to the height of pin 16 feedback voltages, thereby plays the control to main circuit 52.

Described power display circuit 56 comprises that sample resistance 561, amplifier 563, the demonstration integrated circuit 562 be located in main circuit 52 loops that connect with circuit successively reach five light-emitting diodes 564,565,566,567,568 that join with five output pins that show integrated circuit 562.In the main circuit 52 electric current from 24 volts of positive terminals through field effect transistor 521,522 to 12 volts of load positive terminals of energy storage inductor again through 12 volts of load negative pole ends, 561 to 24 volts of negative pole ends of resistance.Be reflected as the size of voltage after the size of electric current is just taken a sample by resistance 561 in the major loop like this.Because output voltage is generally stable, the information of electric current just can reflect and the information of power output also promptly can be reflected by the sampling voltage of resistance 561 in the major loop like this.Magnitude of voltage after the sampling is sent into demonstration integrated circuit 562 after amplifying by amplifier 563, shows the height of integrated circuit 562 according to its 5 output pin voltages, reflects successively by five light-emitting diodes 564,565,566,567,5687.Be that light-emitting diode 564,565,566,567 green lights represent that 25%, 50%, 75%, 100% connects loaded work piece when lighting successively, when light-emitting diode 568 red lights are lighted, then represent overburden work.

Described overvoltage, under-voltage protecting circuit 55 are provided with the opposite triode 553,554 of bipolarity that two bleeder circuits 551,552 and base stage link to each other with two bleeder circuits 551,552 respectively; the input pin 1 of the output of this overvoltage, under-voltage protecting circuit and control impuls integrated circuit 542 joins, and its input links to each other with power input 51.Described bleeder circuit 551 comprises two

divider resistances

5511,5512, and the base stage of triode 553 is connected between two divider resistances, and emitter connects 5 volts of positive voltages.Described bleeder circuit 552 comprises three

divider resistances

5521,5522,5523, the base stage of triode 554 is connected between the

divider resistance

5522,5523, its emission collection connects 5 volts of positive voltages, its collector electrode connects an input pin of control impuls integrated circuit 542, and the collector electrode of triode 553 is connected between the divider resistance 5521,5522.The input of this overvoltage, under-voltage protecting circuit directly connects 24 volts of dc supply inputs 51.Triode 554 is a positive-negative-positive, if base voltage cross low its emitter so will with the collector electrode conducting; Triode 553 is the NPN type, if too high its emitter so of base voltage will with the collector electrode conducting, so when input voltage is crossed when low: the base voltage of triode 553 is also low, its emitter will turn-off with collector electrode, the base stage sampling voltage of triode 554 will down be taken a sample and step-down from power input voltage, its emitter will with the collector electrode conducting, therefore the pin 1 of control impuls integrated circuit 542 obtains 5 volts of high level and will drive the pin shutoff, and the field effect transistor 521 of main circuit 52 is not turn-offed main circuit because of having to drive yet.And if power input voltage is when too high: triode 553 conductings will make the base stage of triode 554 to take a sample between resistance 5522 and resistance 5523 with 5 volts of voltages.Because during operate as normal, potential setting will be far above 5 volts between resistance 5522 and the resistance 5521.So the time triode 554 base stage also will be in electronegative potential and conducting, cause driving voltage to turn-off equally, and then main circuit turn-offed.Thereby realize when input voltage is too high or too low protection to circuit.

In the current circuit of main circuit 52, also be provided with an adjustable resistance 523, an input 5422 of control impuls integrated circuit 542 is attached to the adjustable side of adjustable resistance 523, current value in the major loop can be sampled to control circuit is sent into control impuls integrated circuit 542 through resistance 543 pin 1 with information of voltage like this.If current value will become the voltage high level signal that is reflected as greatly on the input 5422 in output short-circuit or when overload major loop; the pin 1 of control impuls integrated circuit after receiving high level signal turn-offs high-frequency driving signal; main circuit 52 also is disconnected, thereby plays the function of short-circuit protection and overload protection.Can change the sampling voltage value that is sampled to by the position of regulating adjustable resistance 523 adjustable sides in addition, also promptly can regulate the overload protection limit value, play the purpose of regulating power output.

The known technology conversion of all those skilled in that art all drops in the protection range of the present utility model.

Claims

1, a kind of DC-DC switch power source transducer, comprise housing (6) and be positioned at the wiring board (5) of this housing, wherein wiring board (5) is provided with power input (51) and power output end (53), it is characterized in that, also be provided with the control circuit (54) and the main circuit (52) that are connected with circuit on the described wiring board (5), the switching tube (521) that this main circuit (52) is provided with the output level control of controlled circuit (54) reaches the energy storage inductor (522) that is connected with the output stage of a switching tube (521).

2, direct-current switch power supply transducer according to claim 1 is characterized in that, described switching tube (521) is a field effect transistor, and its drain electrode is joined with energy storage inductor (522).

3, DC-DC switch power source transducer according to claim 2, it is characterized in that, described control circuit (54) comprises output voltage sample circuit (541) and the control impuls integrated circuit (542) that is connected with circuit successively, the other end of output voltage sample circuit (541) and power output end (53) join, and the output of control impuls integrated circuit (542) links to each other with the grid of switching tube (521).

4, DC-DC switch power source transducer according to claim 3 is characterized in that, four inputs in the described control impuls integrated circuit (542) constitute the input of corresponding two comparators in twos.

5; DC-DC switch power source transducer according to claim 1; it is characterized in that; also be provided with an overvoltage that links to each other with the input of control impuls integrated circuit on the described wiring board (5); under-voltage protecting circuit (55); this overvoltage; under-voltage protecting circuit (55) is provided with two bleeder circuits (551; 552) and base stage respectively with two bleeder circuits (551; 552) triode (553 that the bipolarity of Xiang Lianing is opposite; 554); this overvoltage; the input of the output of under-voltage protecting circuit and control impuls integrated circuit (542) joins, and its input links to each other with power input (51).

6, DC-DC switch power source transducer according to claim 5, it is characterized in that, described bleeder circuit (551) comprises two divider resistances (5511,5512), and the base stage of triode (553) is connected between two divider resistances, and emitter connects 5 volts of positive voltages.

7, DC-DC switch power source transducer according to claim 6, it is characterized in that, described bleeder circuit (552) comprises three divider resistances (5521,5522,5523), the base stage of triode (554) is connected between the divider resistance (5522,5523), its emission collection connects 5 volts of positive voltages, its collector electrode connects an input pin of control impuls integrated circuit (542), and the collector electrode of triode (553) is connected between the divider resistance (5521,5522).

8, DC-DC switch power source transducer according to claim 1, it is characterized in that, also be provided with a power display circuit (56) on the described wiring board (5), this power display circuit (56) comprises that sample resistance (561), amplifier (563), the demonstration integrated circuit (562) be located in main circuit (52) loop that connect with circuit successively reach five light-emitting diodes (564,565,566,567,568) that join with five output pins that show integrated circuit (562).

9, DC-DC switch power source transducer according to claim 1, it is characterized in that, also have an adjustable resistance (523) of being located in main circuit (52) loop on the described wiring board, an input pin of end of this adjustable resistance (523) and control impuls integrated circuit (542) joins.