JPS639885A - Timepiece circuit using series independent light emitting diode turning-on circuit by constant current control system and timepiece using its circuit - Google Patents

Abstract

PURPOSE:To obtain a timepiece circuit which is tolerant to vibration and consists of a small number of components by utilizing a series independent LED turning-on circuit where a constant current control distribution circuit is to be incorporated as a circuit which drives LEDs. CONSTITUTION:Plural LEDs are connected in series having such a polarity that they light, and the constant current distribution circuit is incorporated to allow constant current to flow to the LEDs. Then, LEDs which need to turn both on and off are connected to both polarity ends and no current is allowed to flow to LEDs provided across signal switching control elements as turning-off control elements. Namely, the signal switching control elements flow or do not flow a current when a signal with a high digital signal voltage is generated and do not flow or flow a current when the signal has a low signal voltage, thereby relating the LEDs and signal switching control elements that when the current flows to one side, no current to the other. This series independent LED turning-on circuit utilized to obtain the timepiece circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of use in field work The present invention provides a method for using a plurality of light emitting diodes (hereinafter referred to as "light emitting diodes" as rLE[)J) with low A11l power and brightness. In order to be able to construct it with fewer parts, we light up LEDs arranged in series using a constant current control distribution circuit.
By using and configuring the 11-even-type independent LED lighting exit path, which is an independent (turn-off method), the LED used in the display part of the clock circuit that is displayed is used in the circuit that operates. , concerning a clock circuit that has been made possible and a clock using that circuit.

(B) Conventional technology Conventionally, the drive circuit for lighting the LED of the clock circuit used in the most used LED-displayed clock is mainly a 7-segment L with 11 numerical display LEDs.
I used multiple EDs to light them up. There are two main lighting methods.One of the lighting methods is the static lighting method, which uses an LED drive circuit, which makes the LEDs bright but consumes a lot of power. To reduce power consumption,
Controlling the LED power supply voltage with a switching regulator circuit would increase costs, and if it were incorporated into electronic equipment such as a radio receiver, it would cause noise generation grooves, so it was difficult to use. Another lighting method, the dynamic lighting method, uses LED drive, which consumes less power, but the LEDs are dim. A circuit that combines the best features of both of these lighting circuits, that is, a circuit that connects LED lighting circuits in series in order to light LEDs brightly and with low power consumption, such as the 4th Qil. Using a serial type independent LED lighting circuit, which is a shaped circuit, a 7-segment LED lighting circuit g2I is configured,
By using the configured circuit in a clock circuit, LE
D is bright, consumes little power, and lights up well. First, let's explain the logic of 2 series dual-independent LED lamp circuits.From now on, the signal with the higher voltage as a digital signal will be referred to as the "H level". In addition, from now on, the signal with the lower voltage as a digital signal will be abbreviated as "L level".In addition, from now on, the signal with the lower voltage as a digital signal will be abbreviated as "L level".
The state in which current is allowed to flow through the two terminals that are controlled is
This state is abbreviated as "ONt* state", and both terminals of an analog switch are controlled by one terminal (the state in which no current can flow is abbreviated as "rOFF state").In addition, all analog switches from now on The switch is in the rON state when the input control signal state of the input control l1 II child is at the kite level.
(The following shall be used, and when the input control signal state of the entrance angle control terminal is at L level, the one that becomes "○FF state" shall be used.

For example, turn on LED (31) and turn on LED (32).
, 33), the input terminal of the inverter (256) is at L level in the circuit shown in FIG.
Because of its [- level, the analog switch (67)
Since the transistor (127) is in the OFF state, no current flows from the collector electrode to the emitter electrode. Also,
At that time, since the analog switch (64) is in the ON state because it is the output terminal of the inverter (256), the transistor (124) changes from the collector electrode to the emitter electrode.
Current flows. Therefore, the LED is in a state where it can be lit. In addition, the input terminal of the inverter (257) is at H level, and because of this H level, the analog switch (68)
is in the ON state, so the transistor (
Current can pass from the collector electrode of 128) to the emitter electrode. Also, at that time, since the analog switch (65) is in the OFF state because it is the output terminal of the inverter (257), no current flows from the collector electrode to the emitter electrode of the transistor (125), so the L E D
1. It becomes impossible to turn on the light.

The principle for turning off the LED (33) is also the same as the above-mentioned LED (3).
The principle is the same as described in 2).

There is a resistor (
206, 207, 208) between the power supply voltage, that is, between the 10VOO input terminal (positive terminal) and the 111t
! The circuit shown in Figure 4, which is connected between I (71' eggplant), can maintain a constant current.However,
The LED used in the circuit and a resistive element (206°207.208) + 2 that allows current to flow, such as I8I,
Even though approximately the same resistance K11 is required, if you select a separate bond other than the LED and the paper Ii'tf1m through which approximately the same current can flow, the LED control circuit and its paired I
III! 11 circuit destroys the current balance. Example 1
If we write it in 4Z, for example, if the resistor end is smaller than the resistor 1a through which a current equivalent to that of the LED can flow,
Assume that the resistance elements (206, 207) are larger than the w1 resistance element that can carry the same current as the LED. Hanai assumes that the anti-bias is a resistive element (208), and compares it with an LED and a resistive element through which the same current can flow. Sase LE
D (33) is the LED (31) when a command to turn off the light is issued.
, 32) is dimly lit, and when a command is issued to turn off LEDs (31, 32) and turn on LED (33), the LED
(33) Light up brighter than l.

In addition, we have developed a series-type independent LED lighting circuit that incorporates the constant current control distribution circuit used in the present invention, which will be described later.
! 3eia, but the conventional series independent LE shown in Fig. 4
When compared with the D lighting circuit, it can be seen that the fourth part (3) has many parts, even though it is a circuit of the same type in which three LEDs are connected in series. As shown in the above, circuits using circuits using the 412th circuit had drawbacks such as the current balance would be disrupted unless component 11 was selected, and the number of components was too large. (C) Invention Problems to be SolvedThus, due to the above-mentioned drawbacks, LED numeric displays are more difficult to use than fluorescent display tubes made of glass. In addition, even though it has a long life because it is a semiconductor, it has been avoided and has been difficult to use.The purpose of the present invention is to clarify the above-mentioned drawbacks of U.

(0) Means for Solving the Problems The clock circuit of the present invention will now be explained with reference to FIG. Before that (this, in order to make the circuit easier to understand, a series independent type LE that incorporates a constant current control distribution circuit)
Figure 3 of the D lighting circuit (I'll explain it here. Connect the 11 LEDs (28, 29, 30) in series with the polarity that allows them to light up. Connect the connected n LEDs ( 28, 29, 30) construct a constant current III m distribution circuit using a constant current groove diode (265) in order to flow a constant current J. At this time, for the circuit to flow a constant current, The parts used in the constant current control distribution circuit can be assembled with other parts as long as the constant current is increased by +4.
, /;i ツI's L E D (28, 29, 3
0) C. Among these LEDs (28, 29, 30), use the LEDs that can be turned on and off as needed in the 3rd ca.
In this case, let's assume that the LEDs (28, 29, 30) are all included, and that both of these LEDs (28, 29, 30) are connected to an NP, which is an example of a signal switching element as a control 1R element for turning off the light.
If N-type transistors (121, 122, 123) are interpreted, these transistors (121, 122,
123) J5C1LED of emic electrode 813r2
Connect the cathode electrodes of transistors (28, 29, 30), and connect the collector electrodes of transistors (121, 122, 123) to the anode electrodes of LEDs (28, 29, 30).Transistors (121, 122, 123) ) is connected to one controlled terminal of the analog switch (61, 62, 63) as shown in the figure, and the other controlled terminal 1. Connect to the point where the collector electrode of the t transistor (121°122.1.23) and the anode electrode of the LED (28, 29, 30) are connected.The transistor is an example of a signal switching element as a control element for turning off the light. (121
, 122, 123) is ordered to turn off the lights! ! (In other words, current flows from the collector electrode to the emitter electrode), but if it flows due to noise, for example, a 100 Kfl resistor (191° 192.193
). However, if such a situation does not occur,
There are cases where it is not necessary to attach these resistor coils (191°, 192, 193). The third device installed as above
A clock circuit is constructed using the circuit shown in the figure as a basic circuit. An example of the constructed clock circuit is shown in Figure 1-2 and will be explained.

Current current diode (249, 250, 251° 252.
253, 254, 255) determines the brightness of the LED when it is lit, so the required current (direct) is left in the LEO.The circuit principle is the same configuration as in Figure 3. , LED series #Q shark, that is, LEDll
Of the circuit surrounding! ! 1111 has a maximum of 4 stages, so
When selecting an LED that can flow the current value required at 2 volts for LEDf), if the loss voltage 11 of the constant current diode is 110.3 volts at most, then the operating power supply voltage (i(+VDD input terminal According to the voltage used, the minimum operating voltage is high, and the voltage between Ia and Ia is required to be at least 8.3 volts.
If you decide on the series R grain of LEDs close to I and design it, it will lead to @power consumption. The series-type independent LED lighting circuit shown in Figure 1 lights up at L level. Next, about that, Shou 2
The numeric display BLED of the clock shown in the figure will be explained in terms of C numeric display along with the minute digits.

For example, when displaying the number "1", the LEDs (22,
23), in the minute digit of block (263) of the basic circuit of the digital display clock shown in Figure 1, "B" and "C" will be at L level, and all others will be at H level. When displaying the trick “Next 1 to 5”, the LED (2
1, 23, 24゜26.27),
The basic circuit block of the digital display clock shown in Figure 1 (26
In the digit 3), rBJ and rE are at H level, and all others are at L level. Based on this principle, numbers may be displayed for the tenths, hours, and + hours, and the other LEDs 4J may be lit. At this time,
Naturally, the basic circuit block of a digital display clock (263
) must be provided with power supply voltage. In this way, the pulse signal that ticks the time can be used as a digital display clock! (263), and the counter circuit counts.
This becomes the completed clock circuit of the present invention.

The completed clock circuit of the present invention, for example, the circuit of straw 12, is placed in a case (268), and the watch is ready! 1LED
If you want to insert a board (267) or the like and get electrical energy from a power line, you just need to attach a wire cord (269).

(E) Effects of the Invention Next, the effects of the present invention will be described, but before that, the effects of the circuit shown in FIG. 3 will be described in comparison with the results of the circuit shown in FIG. 4. The circuit shown in Figure 4 consists of a circuit that controls the LED and its pair (fall
If the special messengers of the m circuit were not aligned, the current balance would be disrupted and the number of parts would be large.However, the present invention does not disrupt the current balance and requires fewer components. can be seen by comparing it with the drawing of 4r:2.Reason 1 for not destroying the current balance.Explaining using Fig. 3, the LED (28, 29,
30), a current of 5 milliamps flows through it! If 11 is a current source that provides the required brightness, then temporarily select a 5 mm constant current diode (265), and then
To explain, for example, the input terminal of the analog switch (61) is set to H level, and the input terminal of the analog switch (62, 63)
When the input terminal of the transistor (121
Since a voltage is applied to the base electrode of ), the S electrical energy applied to the collector electrode also flows as a current to the emitter electrode. At that time, the voltage applied to the LED (28) is extremely low, about 0.5 volts, so it does not emit light. Since no voltage is applied to the base electrodes of the transistors (122, 123), the electric energy applied to the collector does not flow into the emitter electrode. Therefore, the LEDs (29, 30) are lit, and the LED (28) is not lit. At that time, the LED (
29, 30), a constant current diode (265) is used in the constant current control distribution circuit, and the output is 5 milliampere. LED (28, 29, 3
Even if all LEDs 0) are lit, or even if only LED (30) is lit, a constant current of 5 milliamps will be drawn. Therefore, the current balance that existed in the circuit shown in Figure 4, which is an example of a conventional series-type independent LED lighting circuit, is no longer present.

Therefore, if you decide on the number of series stages of LEDs and build a designed circuit according to the power supply voltage used for the circuit, for example,
The clock circuit of the present invention shown in Figure 1 on page 1 has the advantage of being able to light up the LED brightly, which is a feature of Torora's static lighting type LEDffii11 circuit, and the low power consumption, which is a feature of the conventional dynamic lighting type LED driving circuit. In addition to inheriting the good points of using electric power, it also eliminates the noise generation and high cost that occur with methods that control the power supply voltage of LEDs using switching regulator circuits, and also eliminates the direct current flow.
A clock circuit that utilizes a series-type independent LED lighting circuit as a drive circuit for the HED is superior to a conventional clock circuit that utilizes a series-type independent LED lighting circuit such as Tomi 4 as an LED II spinning circuit. Like the clock circuit in Figure 3, the constant voltage i
It is almost possible to reduce the number of parts by more than half of the Lε0 drive circuit by using a clock circuit that uses serial independent LED and A light circuits in the LED DM1 circuit based on all A11 circuits. Although it may be possible to do so, it does not require the use of many parts, so the cost is low.

Therefore, a timepiece using the timepiece circuit of the present invention can be configured to have only the above-mentioned features. FIG. 6 shows a clock using the clock circuit of the present invention. It is l■.

The drawing in FIG. 6 shows 12:34 AM (that is, noon WQ).

(F) Other embodiments In implementing the clock circuit of the present invention, constant current II
The all E integrated circuit can be constructed using transistors or field effect transistors instead of constant current diodes, or can be constructed using a floating amplification circuit. the! 111
The circuit of another embodiment of the present invention, which is an example configured with a 1m device, is shown in the fifth example.
This will be explained with reference to the diagram.

Note that here, the number of LEDs connected in series is a maximum of seven stages.

Everything listed here is just an example. all L
The ED shall flow 10 milliamps, and when 10 milliamps flows, the voltage applied to the bipolar tubes of one LED shall be 2 volts.

The field effect transistor (162) and the silicon diode (163) set the reference voltage to 0.6.
Bolt. All PNP transistors (158
, 159, 160, 161), the lowest loss voltage III is
The voltage shall be 0.2 volt. Resistance element (237, 238, 23
9,240) is 5K('i), resistance element (241
, 242, 243° 244') +2, IKn and 1.
, the resistance elements (245, 246, 247, 248) are 3
30 fl, and even if the resistance values of these resistance elements are slightly different, the constant current groove 11 does not change much. Constant voltage 'X1i
The setting of i is 54 voltage obtained by a field effect transistor (162) and a silicon diode (163), or
The resistance is determined by the t7L elements (233, 234, 235, 236). Since the field effect transistor (162) and the silicon diode (163) are used, the reference voltage is set at 0.6 volts, so the resistance elements (233, 234)
, 235, 236).

With the grounding of these resistance elements (233, 234, 235, 236), the one that is not grounded is
．． 261, 262) is directly applied to the negative input terminal. Shusen amplifier (259, 26o, 261, 26
2)+7) B5:2. The input voltage is the pressure 0,6
Volts are applied. Therefore, the negative input terminal of the resistor (259, 260, 261, 262) is about to be 0.6 volts. In other words, at the W! ground of the resistor element (233, 234, 235, 236),
Even those who don't have it will try to get it to 0.6 volts. Therefore, 0
．． 6 volts and 10 milliamps have already been determined, so from Ohm's law, 0.6 volts (voltage) is 10
Milliampere (current), 60fl (resistance)
14, the resistance elements (233, 234, 2
35, 236) becomes son. Therefore, the number of these resistance elements should be 600.

As described above, the power supply voltage is referenced to the ground (+VO
O input is applied to the pancreas. The voltage f1, the voltage applied to the i11 end of one LED is 2 ports, and the number of stages of LEDs connected in series is 71' at maximum! Therefore, 14 ports are required, and at that voltage, a constant current i control distribution circuit Il is required.
The voltage resistance, which is the sum of t loss voltage + i, is +
The tX voltage between the VDD input terminals +i, and in the above case (
A PNP transistor with seven LED stages in series (
159,160°161), the dropout voltage is 0.2
Bolts and abrasive vL elements (234, 235, 236) (7
) [If the loss is a positive value, add 0.6 volts and add the voltage, 14 volts, to the voltage f-, which is 14.8 volts or more, the voltage value is 11.

4.12R FrA'lli: A Ming No. 1r2 is an example of the clock circuit of the present invention, ■ Figure 2 is the clock receiver L
ED (light emitting diode), Fig. 13 is a power-tested series independent LED (light emitting diode) lighting circuit incorporating 80 paths of constant current mi control arrangement, and No. 42 is a vertical LED (light emitting diode) lighting circuit with 1 vertical type from Yodorai. The circuit 5r2 is another example of a clock circuit according to the present invention in which a constant current II distribution circuit is constructed with an input amplifier, and Figure 6 is a perspective view example of a clock using the clock circuit of the present invention.

1.33 is an LED (light emitting diode), 34993 is an analog switch, 94-157 is an NPN transistor, 158-161
is a PNP transistor, 162 is a field effect transistor, 163 is a silicon diode, 164-248 and 266 are resistive elements, 249-255 and 265 are constant current diodes, 256-
258 is an inverter, 259 to 262 are differences il]jl! 1 hat 263 and 264
267 is the digital display basic circuit block, 267 is the clock numeric display word LED f destination diode]
board, 268 is the case, 269 is the wire cord.

Claims (1)

[Claims] 1. A plurality of light emitting diodes are connected in series with a polarity that allows lighting, and a constant current control distribution circuit is incorporated into the plurality of light emitting diodes connected in series with a polarity that allows lighting to flow. Among the plurality of light-emitting diodes that can be turned on in this way, a signal switching control element as a control element for turning off the light is sandwiched between the two extremes of the light-emitting diode that is required both in the off state, that is, in the on state and in the off state. , when current is flowing through the signal switching control element, the light emitting diode, i.e., the signal switching control element as a lighting control element for turning off the light, is placed between the extremes of the light emitting diode, which is required to be in both the on and off states. The structure is such that no current flows through the light emitting diode, and the state of the input control signal of the signal switching control element for controlling the signal switching control element described above is such that when the signal has a higher voltage as a digital signal, the signal switching is switched. Assuming that current is passed through the control element or not, when the voltage as a digital signal is the lower one,
No current flows through the signal switching control element, or if it does, the relationship between the light emitting diode and the signal switching control element, which serves as a control element for turning off the light, is such that current always flows to one end of the light emitting diode. At this time, no current flows through the other end. A series-type independent light-emitting diode lighting circuit, which uses a constant current control distribution circuit that precisely consists of the above, lights up the light-emitting diodes arranged in series and turns them off independently, is used for a clock circuit displayed using light-emitting diodes. A clock circuit constructed using a circuit that drives the light emitting diodes used in the display section. 2. Connect multiple light emitting diodes in series with a polarity that allows them to light up, and incorporate a constant current control distribution circuit into the multiple light emitting diodes connected in series with a polarity that allows them to light up so that a constant current flows through them. Among the plurality of light emitting diodes that can be made, a signal switching control element as a control element for turning off the light is placed between the two extremes of the light emitting diode that is required to be in both the off state, that is, the on state and the off state, and the signal switching control element When a current is flowing through the light-emitting diode, that is, the light-emitting diode has a signal switching control element as a control element for turning off the light at both extremes, which are required to be turned on and off. When the state of the input control signal of the signal switching control element for controlling the signal switching control element is a signal with a higher voltage as a digital signal, the current is applied to the signal switching control element. When the signal is passed or not, and the voltage as a digital signal is lower,
No current flows through the signal switching control element, or if it does, the relationship between the light emitting diode and the signal switching control element, which serves as a control element for turning off the light, is such that current always flows to one end of the light emitting diode. At this time, no current flows through the other end. A series-type independent light emitting diode lighting circuit is a system in which light emitting diodes arranged in series are turned on and turned off independently using a constant current control distribution circuit characterized by the above-mentioned features. A clock that uses a clock circuit that is used as a circuit to drive the light-emitting diodes used in the display section.