CN1858545B - Hand held terminal - Google Patents

Abstract

The present invention relates to mobile communication terminal and discloses one kind of hand held terminal capable of performing basic defense to protect the user while ensuring no harm to the attacker. The hand held terminal has one increased inverter to convert the DC voltage into one AC voltage of 110 V and two electrodes extending beyond the casing of the hand held terminal for discharge in current of 8-20 mA for 0.1 sec. In addition, there are one controllable resistor device connected serially in the circuit for regulating the discharge voltage, and one CPU to judge whether to have discharge voltage in the required range.

Description

Handheld terminal

Technical field

The present invention relates to mobile communication terminal, particularly possess the mobile communication terminal of safeguard function.

Background technology

Along with modern social development, human material progress degree improves constantly, and since the twentieth century, has been unprecedented brilliant period of science and technology particularly, and the mankind have created the hugest in history scientific achievement and material wealth.These achievements have profoundly changed the mode and the quality of human being's production and life.But in the world, in the time of the progress of mankind's material progress, human spirit's development of civilization is slow relatively, even Two World Wars taken place in less than a century, now violence, crime still happen occasionally, particularly at the women and the children that are in the weak tendency status on physiology, mental condition.

The women accounts for half of world population, is the important force that human material progress and cultural and ideological progress is built, and the socio-economic development under any social pattern all be unable to do without women's effect; Children are the future in the world especially, and love and protection children are human nature, be exactly challenge to the whole human world to the two infringement.So the UN Charter is stipulated specially: non-racial, sex, language or religion require to promote and encourage for all mankind's the human rights and the respect of fundamental freedom.Simultaneously, the United Nations also held repeatedly summit meeting in view of women and children's problem, September nineteen ninety-five, the 4th World Conference on Women is in Held in Beijing, reaffirm the aim and the principle of the United Nation Charter, reflected poverty that developing country is concerned about, health care, education emphatically, problems such as women's violences; The children problem special session of the UN General Assembly that held in the New York UN Headquarters in 2002 05 month reaffirms the 10 years from now on promises to children especially.This shows how to prevent that women, children etc. from avoiding violence, the crime infringement has become is the important topic that the whole mankind, the whole society face.

Women, children prevented that the mode of invading from adopting self-defence personal defense skills such as Chinese boxing more in the past, but this method is subjected to assaulter's operability little to what each side originally just was in weak tendency.The science and technology civilization progress provides new hope to women, children's protection.Individual's alarm, sprayer or the like prevent that the product of encroaching on is extensive use of, but these products also are nowhere near to the protection that is subjected to the assaulter.In case of emergency, if can remove, evade the threat that faces, a lot of people's of redemption that can be in time positive health, spirit, property with quick, the most effective a kind of technological means.Otherwise even the offender can be restrained by law afterwards, but injury takes place.Therefore rely on up-to-date science and technology, invent and a kind ofly fasterly, more effective prevent to encroach on product and have very significant meaning.

Weapon is the most frequently used instruments that are used for self-protection of people; adopt the branch club to keep out the infringement of wild beast from the human ancestors in time immemorial; when ought individual suffering external threat now, utilize protections such as gun, cutter oneself, all be the self-defence application example of weapon.

But gun, cutter etc. itself are to have dangerous weapon, and layman such as women and children are extensive use of, and cause the accident that can't retrieve to take place easily; This class weapon carry inconvenience, specialty requires high, does not all obviously meet people's habits and customs with going up weapon when allowing women and children go out; This class weapon itself has very big aggressiveness, and spreading unchecked of gun etc. may can aggravate the social upheaval and the problem of disorder in public order more.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of handheld terminal, makes the user of mobile communication terminal to carry out basic defence to implementing the hurter, wins the valuable time of escaping, and guarantees simultaneously implementing hurter's safety.

For achieving the above object, the invention provides a kind of handheld terminal, this handheld terminal has mobile communication function, wherein comprises battery and the central processing unit that is used for information processing, and described handheld terminal also comprises:

Direct current is delivered the inverter of stream, is used for converting the DC voltage that described battery provides to 30 volts of above alternating voltages; Two electrodes that stretch out described handheld terminal shell are connected with two ac output ends of described inverter respectively, form the alternating current discharge loop when two electrodes are connected by conductor; Electronic switch is connected between described battery and the inverter, is used for switching on and off under the control of described central processing unit; Described central processing unit is used to judge whether the user passes through the list entries of keyboard identical with the sequence of predetermined set, if then open electronic switch and be on the defensive; Described central processing unit is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 3rd thresholding, if then open described electronic switch; Described central processing unit is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 4th thresholding, if then close described electronic switch; Wherein, described the 4th thresholding is greater than the 3rd thresholding.

Wherein, the discharge period in described alternating current discharge loop was less than 0.1 second.

In addition, the discharge current in described alternating current discharge loop is between 8 to 20 milliamperes.

In addition, described handheld terminal also comprises and is serially connected in described alternating current discharge current in loop measuring element, is used to measure the size of alternating current discharge electric current, and reports to described central processing unit;

Described handheld terminal also comprises the controllable resistor device, be serially connected between described inverter and the battery or described alternating current discharge loop in, be used for changing resistance sizes according to the instruction of described central processing unit;

Described central processing unit also is used for after discharge each time, judge the discharge current that described current measurement device reports and the magnitude relationship of predefined first, second thresholding, if discharge current is greater than first thresholding then indicate described controllable resistor device to increase resistance, if discharge current is less than second thresholding then indicate described controllable resistor device to reduce resistance, if discharge current is between first and second thresholdings then to keep the resistance of described controllable resistor device constant;

Wherein, described first thresholding is greater than second thresholding.

In addition, described alternating voltage is 110 volts.

In addition, described handheld terminal also comprises the keyboard for user's input;

Described central processing unit is used to also judge whether the list entries from keyboard is identical with the sequence of predetermined set, if then open described electronic switch.

In addition, described central processing unit is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 3rd thresholding, if then open described electronic switch.

In addition, described central processing unit is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 4th thresholding, if then close described electronic switch; Wherein,

Described the 4th thresholding is greater than the 3rd thresholding.

In addition, described central processing unit also is used for finishing in described alternating current discharge loop the time of discharge postscript recording playback electricity, and the record of preserving discharge time is sent to predefined number by note.

In addition, described handheld terminal can be mobile phone or a personal digital assistant of supporting following any communication system:

Global system for mobile communications, code division multiple access system, broadband CDMA system, CDMA 2000 system, TDS-CDMA system, personal handyphone system, trunked communication system.

By relatively finding, the main distinction of technical scheme of the present invention and prior art is, deliver the inverter of stream being used for increasing on the handheld terminal of mobile communication direct current, convert the direct current of battery in the handheld terminal alternating current of high voltage to, by two electrode discharges that stretch out shell; Alternating voltage can be about 110 volts, and electric current is between 8 to 20 milliamperes, and the discharge period was less than 0.1 second.

In addition between inverter and battery or be connected in series the controllable resistor device in the described alternating current discharge loop, whether CPU is within the appointment scope at the discharge current that discharge back judgement each time measures, if not, then indicate the controllable resistor device to change resistance to adjust the electric current of discharge next time.

Discharging function need be inputed password and just can open in addition.Once can discharge once more every a period of time in the discharge back, do not discharge for a long time and close discharging function.

Can write down discharge time after each discharge, and electric discharge recording is dealt into predefined number by note.

Difference on this technical scheme has brought comparatively significantly beneficial effect, promptly because increased discharging function, so can allow the user carry out basic defence to implementing the hurter.

Because the present invention defines alternating voltage about 110 volts, electric current is between 8 to 20 milliamperes, discharge period can make people's tingle less than 0.1 second in this scope, muscle produces the contraction of tetanic property, but have the life security problem anything but, so the injury to the enforcement hurter who is shocked by electricity does not have essence just makes its discomfort of feeling the short time, sluggish its action speed, victim produces prestige and takes the photograph effect, so that can win the valuable time of escaping.Effect of the present invention is similar to the self-defence products such as " anti-wolf sprays " that has been widely used.

Because CPU can adjust discharge current according to nearest discharge scenario, so the present invention can realize self adaptation under various environment, offset of the influence of factor such as humidity automatically to discharge current, make the discharge each time can be in not only safety but also effectively in the scope.

Because discharging function has been used cryptoguard, and when not discharging for a long time, close automatically, so can effectively prevent unexpected accidental injury.Because repeatedly continuous discharge, so bigger deterrent force is arranged to implementing the hurter.

Fig. 1 is DC/AC inverter circuit schematic diagram figure in the prior art;

Fig. 2 is a square wave signal generator circuit diagram in the prior art;

Description of drawings

Fig. 3 is a field-effect tube drive circuit schematic diagram in the prior art;

Fig. 4 is a metal-oxide-semiconductor field effect transistor power switch circuit schematic diagram in the prior art;

Fig. 5 is a DC/AC inverter operation principle circuit diagram in the prior art;

Fig. 6 is DC/AC inverter circuit board figure and a finished product master drawing in the prior art;

Fig. 7 is the selected components and parts schematic diagram of DC/AC inverter in the prior art;

Fig. 8 is position distribution and the connection schematic diagram of DC/AC inverter FET on radiator in the prior art;

Fig. 9 is the circuit diagram according to the handheld terminal of the first embodiment of the present invention;

Figure 10 is the circuit diagram of handheld terminal according to a second embodiment of the present invention;

Figure 11 is the circuit diagram of the handheld terminal of a third embodiment in accordance with the invention.

The specific embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

At first need to prove, the handheld terminal that the present invention relates to has locomotive function, it can be global system for mobile communications (Global System for mobile Communication, be called for short " GSM "), CDMA (Code Division Multiple Access, be called for short " CDMA ") communication system, WCDMA (Wideband Code Division Multiple Access, be called for short " WCDMA ") communication system, the CDMA2000 communication system, TD SDMA (TimeDivision Synchronous Code Division Multiple Access, be called for short " TD-SCDMA ") communication system, mobile phone or personal digital assistant in personal handyphone system (Personal Handyphone System is called for short " PHS ") or the trunked communication system.

Referring to Fig. 9, in according to the first embodiment of the present invention, handheld terminal is except comprising battery and central processing unit (the Central Processing Unit that is used for information processing, abbreviation " CPU ") beyond the (not shown), also comprises direct current and deliver the inverter of stream, two electrode and electronic switches that stretch out hand-held terminal enclosure.

Wherein, the inverter that direct current is delivered stream is used for converting the DC voltage that battery provides to 30 volts of above alternating voltages, and for instance, in the present embodiment, alternating voltage is 110 volts.Though the technology of inverter belongs to prior art,, and, briefly introduce the structure and the operation principle of inverter below in order to make this specification easier to understand because inverter is an important devices involved in the present invention.

As shown in Figure 1, mainly by metal-oxide semiconductor (MOS) (Metal OxideSemiconductor, be called for short " MOS) type FET, the common power transformer constitutes inverter.Its power output depends on the power of metal-oxide-semiconductor field effect transistor and power transformer, has exempted loaded down with trivial details transformer coiling, is fit to adopt in the amateurish making of electrophile.For operation principle and the manufacturing process of introducing this inverter, the dotted line basket that at first needs to describe emphatically among Fig. 1 identifies several major parts, i.e. square wave signal generator, the first field-effect drive circuit, the second field-effect drive circuit, the first metal-oxide-semiconductor field effect transistor power switch circuit, the second metal-oxide-semiconductor field effect transistor power switch circuit.

Introduce square wave signal generator below in conjunction with Fig. 2, as shown in Figure 2, adopt hex inverter CD4069 to constitute square wave signal generator here.R1 is a compensating resistance in the circuit, is used to improve the frequency of oscillation shakiness that the variation owing to supply voltage causes.The vibration of circuit discharges and recharges by capacitor C 1 and finishes.Its frequency of oscillation is f=1/2.2RC.The peak frequency of circuit shown in Figure 1 is: fmax=1/2.2 * 3.3 * 103 * 2.2 * 10-6=62.6Hz; Minimum frequency fmin=1/2.2 * 4.3 * 103 * 2.2 * 10-6=48.0Hz.Because the error of element, actual value can be slightly variant.The phase inverter that other is unnecessary, input end grounding avoid influencing other circuit.

Next introduce the FET drive circuit in conjunction with Fig. 3, all circuit diagram as shown in Figure 3 after the first field-effect drive circuit among Fig. 1, the local amplification of the second field-effect drive circuit, this circuit receives the oscillator signal from square wave signal generator, because the oscillating voltage signal peak swing of square wave signal generator output is 0～5V, be abundant driving power on-off circuit, in conjunction with Fig. 1 and shown in Figure 3, with TR1, TR2 oscillating voltage signal is amplified to 0～12V here.

Refer again to Fig. 4 and introduce the metal-oxide-semiconductor field effect transistor power switch circuit.Equally all circuit diagram as shown in Figure 4 after the first metal-oxide-semiconductor field effect transistor power switch circuit among Fig. 1, the local amplification of the second metal-oxide-semiconductor field effect transistor power switch circuit, sketch with complementary metal oxide semiconductors (CMOS) (Complementary Metal-Oxide Semiconductor below in conjunction with Fig. 4, be called for short " C-MOS ") FET, the i.e. course of work of the application circuit of enhancement mode MOSFET composition.This circuit is actually an enhancement mode P channel MOS FET and an enhancement mode N-channel MOS FET is used in combination, and the with dashed lines block diagram is dated among Fig. 4.When input is low level, be the situation of left side circuit diagram among Fig. 4, the conducting of P channel MOS FET, output and positive source are connected.When input is high level, be the situation of the right circuit diagram among Fig. 4, the conducting of N-channel MOS FET, output and power supply ground are connected.In this circuit, P channel MOS FET and N-channel MOS FET are always worked under opposite state, and its phase place input is opposite with output.Can obtain bigger electric current output by this working method.Because the influence of leakage current makes grid voltage also not arrive 0V, when grid voltage arrived 2V less than 1, metal-oxide-semiconductor field effect transistor both was turned off usually simultaneously.Different its shutoff voltages of FET are slightly different.Also Just because of this, make this circuit can not cause power supply short circuit because of two pipe conductings simultaneously.

By above analysis, the first metal-oxide-semiconductor field effect transistor power switch circuit, the second metal-oxide-semiconductor field effect transistor power switch circuit and transformer make up, and have just constituted the critical piece of DC/AC inverter, describe its operation principle in detail below in conjunction with Fig. 5.Because the operation principle of metal-oxide-semiconductor field effect transistor power switch circuit has been described in the front, the two uses separately, can obtain bigger electric current output.As shown in Figure 5, if the first metal-oxide-semiconductor field effect transistor power switch circuit, the second metal-oxide-semiconductor field effect transistor power switch circuit are united use, can also produce bigger electric current output.The two again with transformer combination, when this low-voltage of the two generation, big electric current, frequency are low pressure winding by transformer of the alternating signal of 50Hz, can induce High AC voltage in the high-pressure side of transformer, finish direct current to the conversion that exchanges.Here it should be noted that in some cases when quitting work as oscillating part, the low-pressure side of transformer has very big electric current sometimes to be passed through, so the fuse of this circuit can not omit or short circuit.

At last, circuit board is seen Fig. 6.Used components and parts can be with reference to figure 7.The transformer adopting that inverter is used is secondary to be that 12V, electric current are that 10A, primary voltage are the finished product power transformer of 220V.P channel MOS FET (2SJ471) maximum drain current is 30A, and when the FET conducting, resistance is 25 milliohms between leakage-source electrode.If have the power consumption of 2.5W during at this moment by the 10A electric current.N-channel MOS FET (2SK2956) maximum drain current is 50A, and during the FET conducting, resistance is 7 milliohms between leakage-source electrode, if the power that consume during by the 10A electric current this moment is 0.7W.Thus we also as can be known under same operating current situation, the caloric value of 2SJ471 is about 4 times of 2SK2956.So when considering radiator, should note this point.The inverter FET that Fig. 8 shows prior art is in radiator (position distribution and connection on 100mm * 100mm * 17mm).Although caloric value can be very not big when FET worked on off state, and is bigger than normal slightly for the radiator that security consideration is selected for use here.

More than introduce the structure and the operation principle of the inverter that the present invention relates to, next gone on to say the electrode and the electronic switch that relate in the present embodiment.

As shown in Figure 9, two electrodes that stretch out hand-held terminal enclosure are connected with two ac output ends of inverter respectively, are appreciated that to form the alternating current discharge loop when two electrodes are connected by conductor.In the present embodiment, the discharge period in alternating current discharge loop was less than 0.1 second, and the discharge current in alternating current discharge loop is between 8 to 20 milliamperes.

Electronic switch is connected between battery and the inverter, is used for switching on and off under the control of CPU.

This shows, in the present embodiment, by on handheld terminal, increasing the inverter that direct current is delivered stream, convert the direct current of battery in the handheld terminal to the high voltage alternating current, by two electrode discharges that stretch out shell, thus can reach alternating voltage about 110 volts, 8 to 20 milliamperes current strength and less than discharge period of 0.1 second.Because increased discharging function, so can allow the user carry out basic defence to implementing the hurter.

It is pointed out that in the present embodiment, define alternating voltage about 110 volts, electric current is between 8 to 20 milliamperes, discharge period can make people's tingle less than 0.1 second in this scope, muscle produces the contraction of tetanic property, but have the life security problem anything but, so the injury to the enforcement hurter who is shocked by electricity does not have essence just makes its discomfort of feeling the short time, sluggish its action speed, victim produces prestige and takes the photograph effect, so that can win the valuable time of escaping.

Next with reference to Figure 10, the second embodiment of the present invention is described.

As shown in figure 10, the handheld terminal of second embodiment is delivered the electrode and electronic switch that the inverter of stream, two stretch out hand-held terminal enclosure except comprising above-mentioned direct current, further comprises current measurement device and controllable resistor device.

Specifically, current measurement device is serially connected in the alternating current discharge loop, is used to measure the size of alternating current discharge electric current, and reports to CPU.The controllable resistor device is serially connected between inverter and the battery, is used for changing resistance sizes according to the instruction of CPU.The controllable resistor device can be that a device also can be a little circuit that is made of a plurality of devices.

It is pointed out that the controllable resistor device is not limited to the aforesaid inverter that is arranged between battery, as shown in figure 11, in the third embodiment of the present invention, also the controllable resistor device can be arranged in the alternating current discharge loop.

In addition, accordingly, be different from first embodiment, in the second and the 3rd embodiment, CPU also is used for after discharge each time, the discharge current that the judgement current measurement device reports and the magnitude relationship of predefined first thresholding (upper limit) and second thresholding (lower limit), if discharge current is greater than first thresholding, be the upper limit, then indicate the controllable resistor device to increase resistance, thereby reduce electric current; Conversely, if discharge current less than second, promptly lower limit then indicates the controllable resistor device to reduce resistance, thereby increases electric current.If discharge current is between first and second thresholdings then to keep the resistance of controllable resistor device constant.Those skilled in the art can understand, and above-mentioned first thresholding is greater than second thresholding.

This shows, the the 3rd and the 3rd embodiment is on the basis of first embodiment, also between inverter and battery or be connected in series the controllable resistor device in the alternating current discharge loop, whether CPU is within the appointment scope at the discharge current that discharge back judgement each time measures, if not, then indicate the controllable resistor device to change resistance, guarantee that the electric current that discharges meets pre-provisioning request to adjust the electric current of discharge next time.In other words, CPU can adjust discharge current according to nearest discharge scenario, so the present invention can realize self adaptation under various environment, thereby offset of the influence of factor such as humidity automatically, make the discharge each time can be in not only safety but also effectively in the scope to discharge current.

In the fourth embodiment of the present invention, also utilize the keyboard of importing for the user on the handheld terminal to increase a password and start function.Specifically, CPU can be used for also judging whether the user passes through the list entries of keyboard identical with the sequence (being password) of predetermined set except such use.If then open electronic switch and be on the defensive.In addition, in the 4th embodiment, CPU can be used for also judging that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 3rd thresholding, if then open electronic switch.CPU is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 4th thresholding, if then close electronic switch.Be appreciated that above-mentioned the 4th thresholding is greater than the 3rd thresholding.In the present embodiment, discharging function need be inputed password and just can open.And can discharge once more every a period of time (i.e. the 3rd thresholding) in the back of guaranteeing once to discharge, and do not discharge for a long time, then closes discharging function automatically.Owing to discharging function has been used cryptoguard, and has closed automatically when not discharging, so can effectively prevent unexpected accidental injury at long-time (i.e. the 4th thresholding).Simultaneously, because therefore repeatedly continuous discharge have bigger deterrent force to implementing the hurter.

In the fifth embodiment of the present invention, CPU also is used for finishing in the alternating current discharge loop time of discharge postscript recording playback electricity, and the record of preserving discharge time is sent to predefined number by note.Owing to preserve electric discharge recording automatically, and in time electric discharge recording sent to automatically assigned number (as the number of the police), therefore, can be used as strong evidence.If handheld terminal also has positioning function, then can also write down the position of discharge simultaneously and send to and specify number by modes such as notes, help in time rescuing of the police or kith and kin.

More than introduced the structure of handheld terminal of the present invention,, further specified operation principle of the present invention below in order to be that difference of the present invention and effect are more readily understood.When the user was on the hazard, the user can be at terminal user's operation interface continuous password of setting in advance of input in last 3 second, electronic switch closes, and terminal electric shock device function starts at once, exchanges the alternating voltage that produces 110V between two electrode A of a side and the B.

Then, touch the health that threatens the producer as electrode A, 2 of B after, discharge rapidly, the interchange of 110V can be knocked down human body.Meanwhile, the discharge behavior that CPU detects by end cell, then in 0.1 second, the interior electronic switch that cuts off rapidly, according to general knowledge, the limit that human body comes to harm under the electric shock situation is 0.2 second, therefore can guarantee that discharge can not produce too serious injury to the other side when playing the self-defence effect 0.1 second discharge time.

Then, after 2 seconds, CPU starts electronic switch automatically, and thus, the user can carry out the self-defence electric shock to the attacker continuously.

The power consumption ability that exchanges end is calculated roughly as follows:

P=U*U/2R=110V*110V/2*100,000 ohm=0.06w

Wherein, P is a power, and U is a voltage, and R is a resistance

If with calculating according to common 100K ohm of human body resistance, conversion efficiency is according to 20% conservative calculating, then 0.06/20%=0.3w.

On the other hand, the power supply capacity of battery of mobile phone is calculated roughly as follows:

Battery of mobile phone calculates according to 600mah, and the output of battery of mobile phone voltage is calculated according to 3.5V, but power-on time is:

3.5V*600 ampere/1000/0.3w=2.1 hour

This shows that common battery of mobile phone can guarantee the output of continuous electric shock power.

After finish defence, the user inputed the electric shock function password once more, electric shock function was closed.

Though by with reference to some preferred embodiment of the present invention, the present invention is illustrated and describes, those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.

Claims (7)

1. handheld terminal, this handheld terminal has mobile communication function, and wherein comprise battery and be used for the central processing unit of information processing,

It is characterized in that described handheld terminal also comprises:

Direct current is delivered the inverter of stream, is used for converting the DC voltage that described battery provides to 30 volts of above alternating voltages;

Two electrodes that stretch out described handheld terminal shell are connected with two ac output ends of described inverter respectively, form the alternating current discharge loop when two electrodes are connected by conductor;

Electronic switch is connected between described battery and the inverter, is used for switching on and off under the control of described central processing unit;

Described central processing unit is used to judge whether the user passes through the list entries of keyboard identical with the sequence of predetermined set, if then open electronic switch and be on the defensive;

Described central processing unit is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 3rd thresholding, if then open described electronic switch; Described central processing unit is used to also judge that whether the difference of current time and nearest alternating current discharge loop discharging time is greater than predefined the 4th thresholding, if then close described electronic switch; Wherein, described the 4th thresholding is greater than the 3rd thresholding.

2. handheld terminal according to claim 1 is characterized in that, the discharge period in described alternating current discharge loop was less than 0.1 second.

3. handheld terminal according to claim 1 is characterized in that, the discharge current in described alternating current discharge loop is between 8 to 20 milliamperes.

4. handheld terminal according to claim 3 is characterized in that, described handheld terminal also comprises and is serially connected in described alternating current discharge current in loop measuring element, is used to measure the size of alternating current discharge electric current, and reports to described central processing unit;

Described handheld terminal also comprises the controllable resistor device, be serially connected between described inverter and the battery or described alternating current discharge loop in, be used for changing resistance sizes according to the instruction of described central processing unit;

Described central processing unit also is used for after discharge each time, judge the discharge current that described current measurement device reports and the magnitude relationship of predefined first, second thresholding, if discharge current is greater than first thresholding then indicate described controllable resistor device to increase resistance, if discharge current is less than second thresholding then indicate described controllable resistor device to reduce resistance, if discharge current is between first and second thresholdings then to keep the resistance of described controllable resistor device constant;

Wherein, described first thresholding is greater than second thresholding.

5. handheld terminal according to claim 1 is characterized in that, described alternating voltage is 110 volts.

6. according to each described handheld terminal in the claim 1 to 5, it is characterized in that, described central processing unit also is used for finishing in described alternating current discharge loop the time of discharge postscript recording playback electricity, and the record of preserving discharge time is sent to predefined number by note.

7. according to each described handheld terminal in the claim 1 to 5, it is characterized in that described handheld terminal can be mobile phone or a personal digital assistant of supporting following any communication system:

Global system for mobile communications, code division multiple access system, broadband CDMA system, CDMA 2000 system, TDS-CDMA system, personal handyphone system, trunked communication system.

Images