CN1225248A

CN1225248A - Electronic foot warmer

Info

Publication number: CN1225248A
Application number: CN 98110048
Authority: CN
Inventors: 姚建青
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-02-06
Filing date: 1998-02-06
Publication date: 1999-08-11
Anticipated expiration: 2018-02-06
Also published as: CN1116837C

Abstract

The electronic foot warmer utilizes the electromagnetic induction principle to warm foot. A special shoe pad made of thin metal sheet is put in the shoes. When one wears the said shoes and steps on the electronic foot warmer, the alternating electromagnetic field produced by the electronic device can penetrate the shoe soles and makes the thin metal sheet in the shoe pad to produce joule heat, the heated shoe pad can transfer heat to crus cerebris. The advantages include quick heat-transfer, high heat effect, low in power consumption, simple in structure, and low in cost.

Description

Electronic foot warmer

The invention relates to a kind of when wearing footwear and using, the invention that but can in special shoe pad, produce the small household appliance of the warm foot of heat by an electronic installation.

At cold snap, foot is the easiest endures cold.Have footwear to be through on the foot, even near thermal source, foot also is not easy warm.The heater of electric heating has the power consumption height, heats unfavorable shortcoming when wearing footwear.

Order of the present invention ground is in order to provide a kind of electromagnetic induction principle that utilizes directly at the inner electronic product that produces the warm foot of heat of shoe pad.

Electronic foot warmer of the present invention is made up of an electronic installation and matching used special shoe pad two parts that produce alternating electromagnetic field.Electronic installation is mainly by body of heater be installed in the intravital control circuit of stove, inductance coil and power supply and form, power supply is connected to control circuit, the output of control circuit is connected to inductance coil, the body of heater top end face is equipped with the panel that very permeable is crossed the magnetic line of force, and special shoe pad is to accompany foil between the cloth of common shoe pad.

Its operation principle is: general electric main is the control circuit power supply by power supply.The output of control circuit is connected to inductance coil, produces the alternating electromagnetic field that frequency is higher than 20KHz by inductance coil around it.When shoe pad when the inductance coil because the effect of alternating electromagnetic field can produce eddy current at the foil internal induction, produce Joule heat simultaneously.When using electronic foot warmer, special shoe pad is put into footwear, the people wears footwear and steps on panel, and alternating electromagnetic field penetrates the foil in the sole warming insole, and the shoe pad that is heated can directly pass to the vola with heat.

Based on principle of the present invention, heat is directly to be created in the shoe pad.So it is high more a lot of than other electric heating mode of heating efficient, power consumption also has only tens watts, and can wear footwear and use, very convenient.

Below with reference to accompanying drawing embodiments of the invention are further described.

Accompanying drawing 1 is an electronic installation sketch map of the present invention.

Accompanying drawing 2 is special shoe pad sketch maps in the invention.

Accompanying drawing 3 is theory diagrams of control circuit in the invention.

Accompanying drawing 4 is basic circuit diagrams of control circuit in the invention.

With reference to the accompanying drawings 1,2, electronic foot warmer of the present invention is made up of an electronic installation and matching used special shoe pad two parts.Electronic installation is mainly by body of heater 2 be installed in the intravital control circuit 5 of stove, inductance coil 4 and power supply 1 and form.Body of heater is used for supporting and installation elements, and the body of heater top end face is equipped with the panel 3 that very permeable is crossed the magnetic line of force.Panel is trampled for both feet, and panel can not use metal and magnetic conductive material, can use plastics, makes as the engineering plastics that intensity is high.Tight card is equipped with inductance coil at the back side of panel, and it can be four also that inductance coil can be two, in circuit, can connect also and can in parallelly use, in the schematic diagram then equivalence be an inductance.A plurality of inductance coils will well-balancedly be distributed on the plane of back side of panel, its position is both feet and when stepping on together on panel, two inductance coils of use, the inductance coil center is substantially over against the forward foot in a step centre of the palm of both feet, use four inductance coils, the inductance coil center is substantially over against the forward and backward arch of both feet.Inductance coil is hollow coiling.After the blood pressure lowering of electric main process power supply, rectification, filtering, the voltage stabilizing, power to control circuit.Control circuit is controlled at the alternating electromagnetic field that produces certain frequency in the inductance coil, and frequency is in the scope of 25KHz～1MHz.The common cloth of shoe pad 6 usefulness is made, and just folder has advanced thin sheet metal 7 therein, and the present invention has specifically used aluminium flake.Sheet metal uses two or four in a pair of shoe pad, when using two, puts into the position of shoe pad over against forefoot; Use four positions of putting into shoe pad over against forward and backward sole.

With reference to Fig. 3,4, electric main through power supply blood pressure lowering, rectification, filtering after, output direct current+24V and voltage stabilizing+5V gives the control circuit in the body of heater 5 power supplies.Control circuit has comprised that start-up circuit 8, monostable trigger drive circuit 9, LC oscillating circuit 10, load detecting circuit 11, cycle of oscillation testing circuit 12.The LC oscillating circuit be by inductance coil with after an electric capacity is in parallel, the output of the DC voltage of a termination power, the source electrode of another termination power field effect is formed; Start-up circuit 8 is reducible multivibrators, produces the oscillator signal of about 1HZ, and output order stable state triggers drive circuit, is used for a deactivation LC of per second oscillating circuit; The output of monostable triggering drive circuit connects the grid of power field effect, can be that the positive pulse of certain pulsewidth removes to open power field effect pipe with the signal integer of start-up circuit output, adjusts output pulse width, the output of may command circuit; Cycle of oscillation, the input of testing circuit connect the source electrode of power field effect, and output order stable state triggers drive circuit, is used to detect the harmonic period of LC vibration, and its output control monostable triggers drive circuit, so that trigger with LC resonance synchronous; The input of load detecting circuit is received between the drain electrode and resistance R s of power field effect, but output connects the reset terminal of start-up circuit input, and electromagnetic intensity changed caused electric current variation when load detecting circuit can be tested foil near inductance coil.When foil (otherwise title has load to claim non-loaded) when the inductance coil, the output of the load detecting circuit start-up circuit that resets, by cycle of oscillation testing circuit trigger monostable drive circuit, make circuit be in oscillatory regime.The non-loaded output of then forbidding testing circuit cycle of oscillation is still started once every 1 second by start-up circuit.Owing to adopted the method that the LC harmonic period is detected, and the LC harmonic period changes with load variations, so circuit can adapt to the variation of frequency automatically, and makes field effect transistor be operated in the soft opening state of no-voltage conducting, reduce switching loss, improved reliability.Load detecting circuit can guarantee when not using, even powered-down not also makes circuit power consumption minimum.Details are as follows for concrete work process:

When circuit is started working, the about per second kind of being made up of U1 (CC7555) and peripheral cell R1, R2, C1 of multivibrator start-up circuit produces an enabling signal and goes to trigger the single-shot trigger circuit of being made up of U2A (74HC123) and peripheral cell R3, C2, produce the wide pulse of about 20 microseconds, drive field effect transistor DB conducting.Be divided into non-loaded below again and two kinds of situation discussion of load are arranged; Reaching on every side by operational amplifier U3A, U3B (LM324), element R7, R8, R9, C4, W2 form load detecting circuit.The electric current that flows through inductance coil L when non-loaded is less, and on Rs, form pressure drop, after the input of U3A3 foot, amplify, but the current potential of setting than 6 feet of comparator U3B is low, it is low that 7 feet of U3B are output as, and removes circuits for triggering U2B (74HC123) and make it that trigger impulse output can not be arranged, and the 12 feet output of U2B then be height, because the isolation of D2 does not have influence to U1.Multivibrator U1 operate as normal constantly produces enabling signal, and the LC oscillating circuit does not produce resonance simultaneously; When load was arranged, the electric current that flows through L after the DB conducting was bigger, and the voltage that is amplified by U3A is higher than the current potential that the U3B6 foot is set.U3B is output as height, removes the blockade to U2B.Close after DB conducting 20 microseconds,, after C is charged to ceiling voltage,, discharge and recharge the resonant frequency decision of cycle by LC again through the L discharge so L charges to C.By the LC harmonic period testing circuit that U3C (LM324) and peripheral cell R5, R6, D1, W1 form, can detect C and discharge into and approach zero current potential, this moment, 10 feet were lower than 9 feet, and U3C exports a low level.Because 11 feet of U2B be high, so this low level can trigger U2B, U2B exports one 3 positive pulse signal about microsecond through 5 feet, not only by the trailing edge of this positive pulse but also remove to trigger U2A.By the undersuing of U2B12 foot output, make the C1 discharge simultaneously, destroyed the condition of resonance of U1, make it be output as height through D2.U2A produces the driving signal of one 20 microsecond once more owing to triggered by U2B, makes the DB conducting, so moves in circles, and circuit is in oscillatory regime, and produces alternating electromagnetic field around L.

When using electronic foot warmer, energized is put into footwear with special shoe pad, and the people wears footwear and steps on panel, and alternating electromagnetic field penetrates the foil in the sole warming insole, and the shoe pad that is heated can directly pass to the vola with heat.Special shoe pad can wear as common shoe pad usually, and the effect of warm foot is just arranged when just stepping on electronic foot warmer, and an electronic foot warmer can be joined many pairs of shoe pads, uses for many people.

The present invention is applicable to that the long period sits up straight or stand, again because ambient temperature is lower, and the cold occasion of foot.Have and conduct heat soon; Heat is imitated high; The advantage of (having only tens watts) low in energy consumption.And be suitable for wearing the footwear use, very convenient.Simple in structure, cost is low, is specially adapted to family and office space as economical and practical warm sufficient electrical equipment.

Claims

1, a kind of electronic foot warmer that utilizes the warm foot of electromagnetic induction principle, forms by an electronic installation and matching used special shoe pad two parts that produce alternating electromagnetic field, it is characterized in that described electronic installation comprises: body of heater be installed in the intravital control circuit of stove, inductance coil and power supply; The body of heater top end face is equipped with the panel that very permeable is crossed the magnetic line of force and is used to ride, and power supply is connected to control circuit, and the output of control circuit is connected to inductance coil, produces the alternating electromagnetic field that frequency is higher than 20KHz by inductance coil around it; Accompany foil in the described special shoe pad.

2, by the described electronic installation of claim 1, the alternating electromagnetic field that it is characterized in that described inductance coil generation is in the frequency range of 25KHz～1MHz.

3, by claim 1,2 described electronic installations, it is characterized in that described inductance coil is the back side that tight card tightly is installed in panel, inductance coil can be two also can be four, a plurality of inductance coils are on the well-balanced plane that is distributed in back side of panel, its position is both feet and when stepping on together on panel, uses two inductance coils, and the inductance coil center is substantially over against the forward foot in a step centre of the palm of both feet, use four inductance coils, the inductance coil center is substantially over against the forward and backward arch of both feet.

4, by claim 1,2 described electronic installations, it is characterized in that described inductance coil is hollow coiling, described panel does not use metal and magnetic conductive material, and uses plastics, makes as the engineering plastics that intensity is high.

5, by claim 1,2 described electronic installations, it is characterized in that control circuit comprises start-up circuit 8, monostable triggers drive circuit 9, LC oscillating circuit 10, load detecting circuit 11, cycle of oscillation, testing circuit 12, described LC oscillating circuit is with after an electric capacity is in parallel by inductance coil, the DC voltage output of one termination power, the source electrode of another termination power field effect, described start-up circuit output order stable state triggers drive circuit, and monostable triggers the grid that the output of drive circuit connects power field effect, cycle of oscillation, the input of testing circuit connect the source electrode of power field effect, output order stable state triggers drive circuit, the input of load detecting circuit is received between the drain electrode and resistance R s of power field effect, but output connects the reset terminal of start-up circuit input.

6, by the supporting shoe pad of the described electronic installation of claim 1, it is characterized in that the foil in the shoe pad is selected aluminium flake for use.

7, by claim 1, the supporting shoe pad of 5 described electronic installations, it is characterized in that in a pair of shoe pad that sheet metal uses two or four, when using two, put in people's shoe pad position over against forefoot, when using four, put in people's shoe pad position over against forward and backward sole.