CN2393126Y

CN2393126Y - Light emitting diode digital clock

Info

Publication number: CN2393126Y
Application number: CN 99214725
Authority: CN
Inventors: 姜树权; 曾文平; 任化雨
Original assignee: TIANGE TECHNOLOGY AND TRADE DEVELOPMENT Co HAIDIAN DISTRICT BEIJING
Current assignee: TIANGE TECHNOLOGY AND TRADE DEVELOPMENT Co HAIDIAN DISTRICT BEIJING
Priority date: 1999-06-30
Filing date: 1999-06-30
Publication date: 2000-08-23
Anticipated expiration: 2009-06-30

Abstract

The utility model relates to a light emitting diode digital clock and is basically characterized in that the light emitting diode digital clock comprises a self frequency generating part not the frequency of an AC network to avoid the influence of the frequency drift of the AC network; when a back-up power supply part is started, the light emitting diode stops displaying automatically, and can only display when a display control switch is connected, so the electric power is saved.

Description

The light emitting diode digital dock

The utility model relates to a kind of digital dock, particularly relates to the digital dock of a kind of use light emitting diode (LED).

In order to make the digital dock can be high-visible at night, generally adopt two kinds of schemes, a kind of be with quartz analog clock pointer on coat luminescent coating, the user sees that the residing position of pointer gets final product judgement time at night; The shortcoming of this kind scheme is that quartz analog clock has sound when work, can cause interference to the people at night, even cause insomnia.Another kind of scheme is the clock that adopts digital LED (light emitting diode) to show, does not have sound during this kind clock work, because it uses light emitting diode, therefore high-visible at night, very attractive in appearance, therefore this kind clock mostly uses AC power because power consumption is relatively large.

LED digital dock of the prior art is that digital dock integrated circuit such as LM8560 of employing and TMS3450 constitute more, and this clock exists following problem and shortcoming in actual use:

1, general LED digital dock is to be time-base signal with the 50Hz of AC power or the power frequency of 60Hz, gets or 60 vibrations are one second for 50 times of alternating current, forms clock by the digital dock integrated circuit.Obvious, the precision of this clock depends on the precision of AC power oscillation frequency fully, and is therefore very harsh to the latter's requirement.The error of LED digital dock every day is about nine seconds when the oscillation frequency of AC power departs from ten thousand/time of nominal value! So, departing from the bigger countries and regions of nominal value at the actual frequency of AC network, the practicality of this LED digital dock is very poor.

2, aforesaid digital dock integrated circuit has reserve battery circuit and function.But when just being used for the AC power instant cut-off, keeps by reserve battery the clock continuous service (if there is not reserve battery, after alternating current recovers, need readjust clock time) do not accommodate the long period and use, its reason has two: the one, because the LED display power consumption of clock is bigger, a reserve battery will exhaust in two hours under the situation of no alternating current! Therefore, for the countries and regions that AC power can not be guaranteed, the standard reserve battery circuit and the function of these digital dock integrated circuit do not have practicality.

The purpose of this utility model is to propose visual LED digital dock at a kind of night, itself and can avoid being subjected to the influence of the frequency departure of AC network, and can prolong the service time of reserve battery.

The purpose of this utility model is achieved in that a kind of LED digital dock, includes: the digital clock circuit part; Display driving part; The LED display part; Power unit; The standby power supply part; The input end of power unit can be connected with the utility alternating current net; The output of power unit is connected with other each several part; The output of standby power supply part is connected with other each several part; The output of digital clock circuit part is connected to the LED display part; Display driving part is connected with the LED display part; It is characterized in that further including: frequency generation part, the output that part takes place frequency is connected with display driving part; The output of part takes place and is connected with the frequency input end of digital clock circuit part in frequency; And include a reserve battery at least in the described standby power supply part, one first diode, a display control switch, first output terminal of this reserve battery exports display driving part to through this diode, is parallel with a display control switch that is at ordinary times under the off state at the two ends of this diode.Enable in AC dump under the situation of standby power supply, because the existence of diode, and display driving part is not worked, therefore save a large amount of electric energy, if this switch of user's conducting this moment, then standby power supply is powered to display driving part, and the user can see demonstration.

LED digital dock of the present utility model wherein can further include an alarm clock and stop the part of making a noise; It partly is connected with digital clock circuit, stops this sound that makes a noise after continuing for some time for the sound that makes a noise.

LED digital dock of the present utility model, wherein said frequency part take place can followingly constitute: it includes at least: the quartz crystal oscillating unit that produces vibration; With the oscillator divider that carries out frequency division; The quartz crystal oscillating unit is connected with the oscillator divider that carries out frequency division.The output terminal of oscillator divider is connected with the frequency input end of display driving part with the digital clock circuit part.

LED digital dock of the present utility model, wherein said standby power supply part can followingly constitute: second output terminal of wherein said reserve battery exports other each several part to by one second diode.

LED digital dock of the present utility model, therefore high-visible at night, very attractive in appearance because it uses light emitting diode, and can avoid being subjected to the influence of the frequency departure of AC network, reach very high accuracy of timekeeping; Under the situation of using standby power supply, also can keep very high accuracy of timekeeping simultaneously, and can save the power supply of reserve battery in a large number, prolong the service time of reserve battery greatly, realize purpose of design of the present utility model fully.By the following examples, in conjunction with the accompanying drawings, the utility model is further described, wherein:

Fig. 1 is a circuit block diagram of the present utility model; Fig. 2 is the circuit block diagram of first preferred embodiment of the present utility model; Fig. 3 is the circuit diagram of second preferred embodiment of the present utility model;

Fig. 1 is a circuit block diagram of the present utility model; LED digital dock of the present utility model, wherein include: frequency generation part, it can adopt the oscillation frequency dividing circuit with quartz crystal, crystal oscillation is behind frequency division, form the time-base signal of 60Hz vibration accurately, thereby can make the accuracy of this LED digital dock reach the millionth order of magnitude as this LED digital dock; This part of digital clock circuit part can be used integrated circuit of clock ripe in the prior art, as digital dock integrated circuit such as LM8560 and TMS3450; Therefore display driving part needs display driving part that the LED of LED display part is driven because the working current of LED is bigger; The LED display part, it can be made of LED, for the usefulness of clock demonstration, can buy integrated displaying block on the market; Power unit is connected with the utility alternating current net under the duty, wherein includes transformation part and rectifying part at least, and its direct current output is supplied with as the main power supply of this LED digital dock; The standby power supply part wherein includes a reserve battery at least, and reserve battery does not consume when using AC power, when AC interruptions, provides power supply to the LED digital dock; Wherein: the input end of power unit can be connected with the utility alternating current net; The output of power unit is connected with other each several part; The output of standby power supply part is connected with other each several part; The output that part takes place frequency is connected with display driving part; The output of part takes place and is connected with the frequency input end of digital clock circuit part in frequency; The output of digital clock circuit part is connected to the LED display part; Display driving part is connected with the LED display part.

Fig. 2 is the circuit block diagram of first preferred embodiment of the present utility model; The LED digital dock of first preferred embodiment wherein further includes an alarm clock and stops the part of making a noise; It partly is connected with digital clock circuit.Stop to make noisy sound to stop after can making the noisy sound of alarm clock certain hour.

Fig. 3 is the circuit diagram of second preferred embodiment of the present utility model; Second preferred embodiment shows a kind of specific implementation circuit of the present utility model; Its medium frequency generating unit branch, employing has the oscillation frequency dividing circuit of quartz crystal, crystal oscillation is behind frequency division, form the time-base signal of 60Hz vibration accurately as this LED digital dock, thereby the accuracy that can make this LED digital dock reaches the millionth order of magnitude, as shown in Figure 3, frequency generation part I is made up of quartz crystal U1 and oscillator divider U2 (CD4060) and related elements, the oscillation frequency of U1 produces the signal input pin of the time-base signal input digit clock circuit digital dock integrated circuit U4 partly of 60Hz through the U2 frequency division, be input to the base stage of the triode A1 of display driver circuit simultaneously, for display driver circuit provides baseband signal.

Display driver circuit II is made up of two 9013 triode A1 and A2 and related elements, time-base signal forms the phase place consistent with the digital dock integrated circuit through A1 with A2, as the twin cathode power supply, the clock display screen U5 of input LED display part is with the drive clock display screen.

Standby power supply part III is made up of Voltaic battery U3 and display control switch K1 and three diode D1, D2 and D3.When AC power had a power failure, A1 and A2 quit work, and the twin cathode to U5 does not provide power supply, and U5 stops to show, but reserve battery from trend U2 and U4 power supply, U2 and U4 work on.When connecting K1, by A1 and the A2 power supply of reserve battery U3 in display driving part, thereby make clock display screen U5 work, finish the manual demonstration under the AC-less power.

Alarm clock stop making a noise part IV by triode A3 (model is IN5551), A4 (model is IN5401), resistance R 1, capacitor C 1 and element such as the K switch 2 of manually stopping to make a noise form.When alarm clock starts, by the noisy sound output pin (Alarm Out) of U4 by R1 to capacitor C 1 charging, when C1 voltage reaches the cut-in voltage of A3, A3 and A4 conducting, the stopping of the U5 pin (Alarm Stop) that makes a noise is connected with Vss, noisy sound stops.In the sound that makes a noise continues, manually stop the K switch 2 of making a noise if connect, the sound that makes a noise stops.The noisy sound duration is determined by the value of R1 and C1.

Claims

1, a kind of light emitting diode digital dock includes: the digital clock circuit part; Display driving part; The LED display part; Power unit; The standby power supply part; The input end of power unit can be connected with the utility alternating current net; The output of power unit partly is connected with digital clock circuit part, display driving part, LED display part, standby power supply; The output of standby power supply part is connected with digital clock circuit part, display driving part, LED display part; The output of digital clock circuit part is connected to the LED display part; Display driving part is connected with the LED display part; It is characterized in that further including:

Frequency generation part, the output terminal of power unit is connected with this frequency generating unit branch respectively with the output terminal of standby power supply part; The output that part takes place frequency is connected with display driving part; The output of part takes place and is connected with the frequency input end of digital clock circuit part in frequency; And

At least include a reserve battery in the described standby power supply part, one first diode, a display control switch, first output terminal of this reserve battery exports display driving part to through this diode, is parallel with a display control switch that is at ordinary times under the off state at the two ends of this diode.

2, light emitting diode digital dock as claimed in claim 1 is characterized in that: wherein further include an alarm clock and stop the part of making a noise; It partly is connected with digital clock circuit.

3, light emitting diode digital dock as claimed in claim 1 or 2 is characterized in that: part takes place and includes at least in described frequency: the quartz crystal oscillating unit that produces vibration; With the oscillator divider that carries out frequency division; The quartz crystal oscillating unit is connected with the oscillator divider that carries out frequency division.The output terminal of oscillator divider is connected with the frequency input end of display driving part with the digital clock circuit part.

4, light emitting diode digital dock as claimed in claim 1 or 2 is characterized in that: second output terminal of described reserve battery is in series with one second diode.

5, light emitting diode digital dock as claimed in claim 3 is characterized in that: second output terminal of described reserve battery is in series with one second diode.