CN203909494U - Heavy type truck self-charging central clock - Google Patents

Abstract

The utility model relates to a heavy type truck self-charging central clock and belongs to the technical field of vehicle-mounted clocks. According to the heavy type truck self-charging central clock, a power supply power source, a Farad capacitor and a one-chip microcomputer are designed to form a self-charging-and-discharging module; while the original function of the clock is reserved, that correct time is displayed by the clock and normal timing can be realized is ensured when the clock is powered on again after the power supply of the clock is interrupted for a while under the condition that no external power source is available.

Description

Heavy truck self-charging central clock

Technical field

The utility model relates to vehicle-mounted clock technology field, is specifically related to a kind of heavy truck self-charging central clock.

Background technology

At present, the vehicle-mounted clock of using on heavy truck is to carry out work by connecting the 24V power supply of accumulator, and generally only possessing basic clock timing function and quarter-bell arranges function.And the use of heavy truck has periodically, intermittent feature, thus vehicle stop transport or during maintenance for preventing the deficient electricity of car load, often the 24V power supply of car load is turned off.This just causes common vehicle-mounted clock when car load power-off a period of time works on power again, and the phenomenon of the time factory reset of vehicle-mounted clock display occurs, and causes user's inconvenience.

Utility model content

(1) technical matters that will solve

The technical problems to be solved in the utility model is: how to design a kind of heavy truck self-charging central clock, make it when car load is not worked, also can in the situation that not relying on external power source, maintain the normal clocking capability of clock.

(2) technical scheme

In order to solve the problems of the technologies described above, the utility model provides a kind of heavy truck self-charging central clock, comprise power supply, farad capacitor, display screen and single-chip microcomputer, described power supply is connected with farad capacitor, display screen and single-chip microcomputer respectively, described single-chip microcomputer is connected with display screen with farad capacitor respectively, and described single-chip microcomputer is built-in with display screen drive chip and clock chip.

Preferably, described central clock also comprises the control button being connected with power supply and single-chip microcomputer respectively.

Preferably, described central clock also comprises the hummer being connected with power supply and single-chip microcomputer respectively.

Preferably, described hummer is passive hummer.

Preferably, described single-chip microcomputer is 8 single-chip microcomputers of technical grade.

Preferably, described clock chip is PCF8563T.

Preferably, described display screen is 4 LCDs.

Preferably, described farad capacitor is the button farad capacitor of 4F/5.5V specification.

(3) beneficial effect

The utility model by design power supply, farad capacitor and single-chip microcomputer as from charge-discharge modules, when retaining clock original function, even make clock in the state without external power source, still can guarantee when power-off a period of time re-powers, the time-division that clock display is correct also starts normal timing.

Accompanying drawing explanation

Fig. 1 is the structural representation of the utility model embodiment.

Embodiment

For making the purpose of this utility model, content and advantage clearer, below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.

As shown in Figure 1, the utility model embodiment provides a kind of heavy truck self-charging central clock, comprise power supply 1, farad capacitor 2, display screen 3 and single-chip microcomputer 4, described power supply 1 is connected with farad capacitor 2, display screen 3, single-chip microcomputer 4, hummer 5, control button respectively, for these five parts power supplies, described single-chip microcomputer 4 is connected with farad capacitor 2, display screen 3, hummer 5 and control button respectively, and described single-chip microcomputer 4 is built-in with display screen drive chip and clock chip.

Principle of work of the present utility model is as follows: when having externally fed, power supply 1 gives farad capacitor 2 chargings, farad capacitor 2 is as standby power supply, when without externally fed, farad capacitor 2 is to single-chip microcomputer 4 electric discharges, make the normal timing of its built-in clock chip, while restoring electricity, the built-in display screen drive chip of single-chip microcomputer 4 makes the correct displaying time of display screen 3 and timing, hummer 5 is realized alarm clock function when having externally fed, control button and comprise set of time button 601, alarm clock arranges key 602 and backlight control key 603, realize the time respectively, alarm clock function is set, and the backlight control function of display screen 3.

In the present embodiment, described hummer 5 is passive hummer, has the feature of low-work voltage, low working current; Described single-chip microcomputer 4 is 8 single-chip microcomputers of technical grade, and built-in described clock chip is PCF8563T, has the feature of low-power consumption; Described display screen 3 is 4 LCDs, provides and shows 24 hours, and hour, minute value, glimmer and alarm clock prompting second ": ".

Farad capacitor, claims again super capacitor, and the common capacitor of its volume ratio is much bigger.Because its capacity is very large, externally performance is identical with battery, is therefore also known as " capacitor batteries ".Farad capacitor belongs to ripe product, at automobile and other field, has application comparatively widely.

Farad capacitor has following characteristics:

Charging rate is fast, charges and can reach the more than 95% of its rated capacity in 10 seconds～10 minutes; Service life cycle is long, and degree of depth charge and discharge cycles access times can reach 1～500,000 time, there is no " memory effect ", also do not have the problem of over-discharge can; Large current discharging capability is superpower, and energy conversion efficiency is high, and process loss is little, large current energy cycle efficieny >=90%; Power density is high, can reach 300W/KG～5000W/KG, is equivalent to 5～10 times of battery; Product starting material form, produce, use, store and disassemble process all less than polluting, and are desirable environmental protection power supplys; Discharge and recharge circuit simple, without the such charging circuit of rechargeable battery, safety coefficient is high, uses for a long time non-maintaining; Ultralow temperature characteristic is good, and temperature range is wide-40 ℃～+ 70 ℃; Common 0.1F～the 1000F of range of capacity.

The characteristic of above farad capacitor can meet central clock and realize rapid charge, the stable object of exporting and recycling by ball bearing made using.This just can carry out at short notice self-charging by charging module when vehicle is normally worked, and then at central clock, during without externally fed, still can guarantee the correct timing of clock chip.When vehicle re-powers, screen can show the current time-division and start normal timing.

In the present embodiment, the button farad capacitor of the 4F/5.5V specification that described farad capacitor 2 is small volume, can realize after power-off in 15 days, and when clock re-powers, clock, alarm clock can normally be worked.Be below the correlation computations of capacitor's capacity and work duration, formula is:

T=F*(Vmax-Vmin)／I

Wherein: T represents work duration, the s of unit; F represents capacitor's capacity, the F of unit; Vmax represents system maximum operating voltage, the V of unit; Vmin represents the minimum operating voltage of system, the V of unit; I represents system works electric current, the A of unit.

In external power source, have no progeny, central clock quits work, and now main current drain is clock chip PCF8563T.The maximum operating currenbt of this chip when not external communication only guarantees the validity of clock is 550nA, the maximum operating voltage 4.3V that farad capacitor can provide, the minimum operating voltage 1.8V of chip.When system is recovered external power source, central clock powers on, and first from clock chip PCF8563T, reads current effective time, then starts normal timing.

Therefore, in the present embodiment:

F=4；Vmax=4.3V；Vmin=1.8V；I(PCF8563T)=550nA

But, farad capacitor itself exists certain leakage current, and leakage current can reduce gradually along with the decline of voltage in discharge process, by the test to farad capacitor, the consider 360 hours duration of (15 days), comprehensive leakage stream I (F)=6 μ A.

Thus, can calculate the work duration of farad capacitor:

T=F* (Vmax-Vmin)/(I (PCF8563T)+I (F)) ≈ 1526717s ≈ 17.7 days

Wherein, comprehensive leakage stream has provided relative redundancy amount.So can meet central clock power-off 360 hours (15 days) times re-powers, and screen should show the current time-division and start the requirement of normal timing.

As can be seen from the above embodiments, the utility model by design power supply, farad capacitor and single-chip microcomputer as from charge-discharge modules, when retaining clock original function, even make clock in the state without external power source, still can guarantee when power-off a period of time, (15 days) re-powered, the time-division that clock display is correct also starts normal timing.

The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of the utility model know-why; can also make some improvement and distortion, these improvement and distortion also should be considered as protection domain of the present utility model.

Claims (8)

1. a heavy truck self-charging central clock, it is characterized in that, comprise power supply (1), farad capacitor (2), display screen (3) and single-chip microcomputer (4), described power supply (1) is connected with farad capacitor (2), display screen (3) and single-chip microcomputer (4) respectively, described single-chip microcomputer (4) is connected with display screen (3) with farad capacitor (2) respectively, and described single-chip microcomputer (4) is built-in with display screen drive chip and clock chip.

2. the central clock as described in claim 1., is characterized in that, described central clock also comprises the control button being connected with power supply (1) and single-chip microcomputer (4) respectively.

3. central clock as claimed in claim 1, is characterized in that, described central clock also comprises the hummer (5) being connected with power supply (1) and single-chip microcomputer (4) respectively.

4. central clock as claimed in claim 3, is characterized in that, described hummer (5) is passive hummer.

5. central clock as claimed in claim 1, is characterized in that, described single-chip microcomputer (4) is 8 single-chip microcomputers of technical grade.

6. central clock as claimed in claim 1, is characterized in that, described clock chip is PCF8563T.

7. central clock as claimed in claim 1, is characterized in that, described display screen (3) is 4 LCDs.

8. the central clock as described in any one in claim 1～7, is characterized in that, described farad capacitor (2) is the button farad capacitor of 4F/5.5V specification.