CN2150670Y

CN2150670Y - Portable DC mains

Info

Publication number: CN2150670Y
Application number: CN 93205169
Authority: CN
Inventors: 张怡章
Original assignee: Iwei Tech Co Ltd
Current assignee: Iwei Tech Co Ltd
Priority date: 1993-03-08
Filing date: 1993-03-08
Publication date: 1993-12-22
Anticipated expiration: 2003-03-08

Abstract

The utility model relates to a portable DC power whose power is supplied by a rechargeable battery pack. The output voltage of the portable DC power is stable through adjusted by a switch mode power conversion circuit and a pulse width adjusting circuit and is filtered by a filter circuit. A voltage regulating device adopts a pressing key matched with a pressing recurrent selection circuit and a feedback ratio switching circuit to change the voltage feedback quantity of the pulse width adjusting circuit and achieve the purpose of changing the value of the output voltage. The portable DC power can provide a plurality of output voltages for various electric appliances with different voltage specifications, and is provided with indicator lights corresponding to each voltage to indicate the values of the output voltages. The utility model has safe use, and convenient operation and carrying.

Description

Portable DC mains

The utility model relates to a kind of DC power supply, particularly a kind of Portable DC power supply that uses for multiple electrical equipment, its mainly by rechargeable battery set, press button and the internal regulation circuit is formed.

Consumer electronics series products now is of a great variety, develops very soon, but its power supply has nothing in common with each other according to different designs, for in the room use occasion, unlikely throwing into question, but go out or during outing, because of various electronic products, as illuminating lamp, the portable radio-cassette player of listening at any time, miniature portable television etc., need different supply power voltages, and cause the difficulty in the use, not only increase burden, also, improved necessity is arranged really because of the battery discarded object causes environmental pollution; Though the illuminating lamp of storage battery formula is arranged now, it maybe can solve the inconvenience that some carry battery, but the output voltage of this class storage battery is generally fixed numbers, only can solve the problem of illuminating lamp power supply at most, do not conform to the power supply that can't be used for other electrical equipment because of voltage specification, but also do not have the portable power supply of suitable pressure regulation at present, this problem truly has necessity of solution.

Main purpose of the present utility model is: a kind of DC power supply with voltage in several modes specification is provided, makes it applicable to different electrical equipment, the operation that its voltage switches also only needs to push continuously and can switch between each voltage specification with singly-bound.

Of the present utility model time a purpose is: a kind of DC power supply is provided, the continuous change action of singly-bound that its voltage switches, be successively to the low-voltage conversion by ceiling voltage, damage and can exempt because of false touch causes electric equipment products, and when switching to minimum voltage, desire to go when switching to ceiling voltage again, the no-voltage condition that one neutral gear is arranged, that is need to push just via twice and can switch to the ceiling voltage state, to avoid false touch.

Another purpose of the present utility model is: a kind of Portable DC power supply that has the accessory power outlet of plurality of specifications is provided, and it is the socket that varies in size, and the cigar lighter power output socket is arranged, so that supply various electrical equipment and car electrics use.

A purpose more of the present utility model is: a kind of Portable DC power supply is provided, and its internal circuit is provided with short circuit and the overload protective effect of cutting off the electricity supply automatically, damages to prevent electrical equipment, guarantees safe in utilization.

The Portable DC power supply that the utility model provides comprises power supply body, rechargeable battery and cradle; Power supply body front end is provided with illuminating lamp, and inside is provided with rechargeable battery, it is characterized in that:

The power supply body is provided with a button pressure regulation indication panel, the indicator light that one pressure regulation button and at least two indication output voltage numerical value are arranged on it, power supply body side is provided with corresponding accessory power outlet, the pressure regulation button, accessory power outlet, rechargeable battery and indicator light are connected with internal circuit, this circuit comprises: the switch mode power change-over circuit, pulse-width modulation circuit and filter circuit, between power-switching circuit output and pulse-width modulation circuit input end, be connected with resistance-type back coupling ratio commutation circuit, feedback the ratio commutation circuit and be made up of at least two transistors that are connected in series different feedback resistances respectively, the transistor input is connected in one and pushes each output of cyclic selection circuit and connect the voltage indicating circuit of corresponding indicator light; Push cyclic selection circuit and be made of a tap changer and a decoder, with the change of tap changer compression number, the corresponding output current potential of decoder changes, and back coupling ratio and output voltage change.

Be provided with a trigger between described tap changer and the decoder, for input pulse to decoder.

The overload protection end of described pulse-width modulation circuit is connected with ground by a current-limiting resistance, is stopped voltage output when output short-circuit or overload.

Portable DC power supply of the present utility model has following effect:

Because the accessory power outlet that this DC power supply has voltage in several modes and multiple size specification is applicable to different electrical equipment, its voltage handover operation mode is easy, only needs to push the switching that can realize each voltage specification continuously with singly-bound; Owing to when voltage switching of the present utility model is high voltage by low voltage transition, the no-voltage condition of a neutral gear is arranged, can avoid by false touch, cause electrical equipment to damage, guarantee safe in utilization; Because the utility model home loop is provided with short circuit and the overload protective circuit of cutting off the electricity supply automatically, can prevent that electrical equipment from damaging again, it also has the voltage stabilizing characteristics, and its volume is little, in light weight, is convenient to go out to portably use.

Further specify architectural feature of the present utility model below in conjunction with drawings and Examples.

Brief Description Of Drawings:

Fig. 1 is the schematic appearance of Portable DC power supply of the present utility model;

Fig. 2 is a circuit block diagram of the present utility model;

Fig. 3 is a circuit diagram of the present utility model.

As shown in Figure 1, the utility model is to be made of a power supply body 90 collocation one cradle 93, wherein, the power supply of power supply body 90 is by its inner Ni-Cd nickel-cadmium group power supply, and be combined with corresponding voltage stabilizing and adjust circuit (appearance aftermentioned), body 90 external forms are similar to the shape of portable flashlight, its top is provided with for portable handle 92, the place ahead is provided with illuminating lamp 91, its side is provided with slidingtype mains switch 70 and can be for in-line power being reached the charging socket 81 that inner rechargeable battery is charged through cable input electric power, 93 of cradles can be inserted for body 90, and directly implement charging by 931 pairs of bodies of contact, the 90 charge inside batteries of cradle 93, so that make body 90 after charging is finished, body 90 can be taken out, so that go out to portably use, and the power supply of this cradle 93 partly also can be taken the power supply of automobile, use in the car and this cradle 93 can be located at, aforementioned in addition is separate structures with cradle 93 with power supply body 90, so that go out to carry.

The another side of power supply body 90 (figure does not show) is provided with a plurality of different size specification power output sockets, to be applicable to the power supply connector of various electrical equipment, handle 92 rear end end faces in this body 90 are provided with a cigarette lighter socket 94 in addition, can use for the attaching plug of cigarette lighter plug pattern, so various power output socket of the present utility model, electrical equipment applicable to major part, to exempt the difficulty of joint switching, be provided with a pressure regulation panel in addition in the front upper place of body 90, panel one side is provided with a button tap changer 14, opposite side is provided with respectively in order to indicate a plurality of indicator lights 31 of output voltage state, and after the mains switch 70 of body 90 sides is opened, even showing the indicator light 31 of minimum voltage connects, this moment, promptly voltage status was for this reason exported in expression, and be convenient to inspect night, if when needing to adjust its output voltage, only need push this tap changer 14 continuously, can do the output voltage adjustment, at first need to make it to skip to the ceiling voltage place by twice mode of pushing, be reduced to minimum output voltage by ceiling voltage successively again, cycling according to this, and the indicator light 31 of corresponding indication output voltage also is respective change, clearly indicate output voltage numerical value to reach, so with this button circulation pressure adjusting structure and relevant deixis, the convenience of adjusting voltage is provided, and the numerical value class of its voltage is respectively 1.5V, 2V, 3V, 4.5V, 6V, 7.5V, 9V, eight kinds of 12V etc., even also voltage specification all electrical equipment in 12 volts of scopes all are suitable for, the convenience that true tool goes out to power, need to push for twice the mode that the beginning can switch and desire to switch to maximum potential by minimum voltage, be mainly release and cause the too high problem of output voltage because of false touch, when switching, this voltage is reduced to the order of low-voltage in regular turn by high voltage, automatically be positioned at the minimum voltage state during start, also, guarantee safe in utilization for to guarantee that not reason false touch causes the damage to electrical equipment.

Shown in the block diagram of Fig. 2; the utility model also has the effect of voltage stabilizing power supply and overcurrent protection; after power supply of the present utility model is imported by rechargeable battery set 80; promptly by a switch mode power change-over circuit 40; pulse-width modulation circuit 50 and filter circuit 60 constitute a switch type power supplying device (SWITCHING POWER); to supply required regulated output voltage; and the utility model is aspect the adjustment output voltage; then finish by a back coupling ratio commutation circuit 20 that is connected between switch mode power converter 40 outputs and pulse-width modulation circuit 50 inputs; be fed back to pulse-width modulation circuit 50 by different feedback voltages; input in the switch mode power change-over circuit 40 and produce different pulsed drive signals by pulse-width modulation circuit 50; can reach the purpose that changes the output voltage height; and this input of feedbacking ratio commutation circuit 20 promptly be controlled by be connected with aforementioned tap changer 14 push cyclic selection circuit 10; so can change the back coupling ratio of this back coupling ratio commutation circuit 20 according to the compression number of tap changer 14; the voltage indicating circuit 30 that aforementioned each voltage indicator lamp that is positioned at body 90 tops is formed is then directly pushed cyclic selection circuit 10 by this and is driven demonstration; and voltage indicating circuit 30 is changed synchronously, to reach the purpose of certain demonstration output voltage numerical value.

As shown in Figure 3; it is a circuit diagram of the present utility model; the drawing top promptly imports one by transistor 41 with rechargeable battery set 80 serial connection mains switches 70; in the switch mode power change-over circuit 40 that choke 42 and diode 43 are formed; and these change-over circuit 40 outputs are connected with a plurality of accessory power outlets 61～63 through a filter circuit 60; promptly be connected with the base stage of transistor 41 and be positioned at change-over circuit 40 belows with the output of the pulse-width modulation circuit 50 of an integrated circuit form; do switching regulator with supply transistor 41 and switch required pulse signal; its overload protection end Y then connects a current-limiting resistance 51 and gives ground connection; so that when output short-circuit or overload, can make pulse-width modulation circuit 50 stop output signal; play the protective effect of cutting off out-put supply; then be connected to the output of switch mode power change-over circuit 40 in addition with a ratio resistance 29 in the back coupling input X of pulse-width modulation circuit 50; and be connected to a circuit and be positioned on the bottom-right back coupling ratio of the drawing commutation circuit 20; so that feedback the effective resistance that ratio commutation circuit 20 constituted and the relative ratio of this ratio resistance 29 with this; be fed back to the back coupling amount of pulse-width modulation circuit 50 with formation; if feedback the ratio height; then represent the output voltage height, otherwise represent that then output voltage is low.

Described back coupling ratio commutation circuit 20 promptly is made of the different resistance of eight group transistors, 21～28 serial connections; what the base stage of each transistor 21～28 then was controlled by drawing left side pushes cyclic selection circuit 10; according to selecting circuit 10 to make the one output is high potential; feedback the one grounding through resistance of ratio commutation circuit 20 and make; and generation back coupling effect; this pushes cyclic selection circuit 10 and comprises a tap changer 14; two gate circuits 12; 13 triggers that constitute; one decade decoder 11 and a replacement transistor 15; this tap changer 14 is sensitive switches; often opening of this tap changer 14; normally closed contact is connected to respectively on this trigger; and the trigger output is connected with decade decoder 11 sequential inputs (CLK) therewith; so that the pulse of corresponding input same number enters in the decade decoder 11 according to tap changer 14 pressurized number of times; make decoder 11 count and decode; the Q0 of this decoder 11; Q2～Q8 output promptly is connected with back coupling ratio commutation circuit 20 respectively; its Q9 output then is fed back on the decoder 11 replacement ends (RST) via transistor 15; so that when pushing for the tenth time; can reset and return to the Q0 output is high potential; that is form the continuous structure switched of circulation; so can make decoder 11 make each output be switching in turn of high potential in regular turn according to the pressurized number of times of tap changer 14; so; promptly reach the feedback resistance that changes this back coupling ratio commutation circuit 20 and change output voltage; be connected with a voltage indicating circuit that light-emitting diode constituted 30 by respective amount in eight output signals of this decoder 11 are more direct in addition; corresponding according to this indication output voltage numerical value; and the second output Q1 of decoder 11 is sky to connect state; being mainly provides when desiring to desire to switch to Q2 maximum output voltage state by the minimum output voltage state of Q0 after the start; promptly need therebetween to push by twice; making it skip Q1 output pin beginning, to make Q2 be high potential; so; this through push for twice finish minimum; the mode that ceiling voltage switches; can prevent that false touch from causing voltage to switch improperly; reach the purpose of protection external connection electrical apparatus; and other push switching mode also for to switch to low-voltage successively by high voltage; if during false touch tap changer 14; because output voltage reduces rather than raises; unlikely electrical equipment is caused damage, so the design that this voltage switches has the safeguard protection effect.

By above-mentioned structure as can be known, power supply of the present utility model is through pushing cyclic selection circuit 10 and constitute compression number decoding and through feedbacking the change action of ratio commutation circuit 20 feedback resistance values, promptly reach the purpose that changes output voltage numerical value, so DC power supply of the present utility model really is one to be applicable to the futuramic power supply of various low-voltage electrical equipment with the pulsewidth that changes pulse-width modulation circuit 50.

Claims

1, a kind of Portable DC power supply, it comprises power supply body, rechargeable battery and cradle, and power supply body front end is provided with illuminating lamp, and inside is provided with rechargeable battery, it is characterized in that:

The power supply body is provided with a button pressure regulation indication panel, the indicator light that one pressure regulation button and at least two indication output voltage numerical value are arranged on it, power supply body side is provided with accessory power outlet, the pressure regulation button, accessory power outlet, rechargeable battery and indicator light are connected with internal circuit, internal circuit comprises: the switch mode power change-over circuit, pulse-width modulation circuit and filter circuit, between power supply changeover device output and pulse-width modulation circuit input end, be connected with resistance-type back coupling ratio commutation circuit, feedback the ratio commutation circuit and be made up of at least two transistors that are connected in series different feedback resistances respectively, the transistor input is connected in one and pushes each output of cyclic selection circuit and connect the voltage indicating circuit of corresponding indicator light; Push cyclic selection circuit and be made of a tap changer and a decoder, with the change of tap changer compression number, the corresponding output current potential of decoder changes, and back coupling ratio and output voltage change.

2, Portable DC power supply according to claim 1 is characterized in that: be provided with a trigger between described tap changer and the decoder, with input pulse to decoder.

3, Portable DC power supply according to claim 1 is characterized in that: the overload protection end of described pulse-width modulation circuit is connected with ground by a current-limiting resistance, is stopped voltage output when output short-circuit or overload.