CN1093811A - Used low-voltage detection circuit on the remote control unit - Google Patents

Used low-voltage detection circuit on the remote control unit Download PDF

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Publication number
CN1093811A
CN1093811A CN94102194A CN94102194A CN1093811A CN 1093811 A CN1093811 A CN 1093811A CN 94102194 A CN94102194 A CN 94102194A CN 94102194 A CN94102194 A CN 94102194A CN 1093811 A CN1093811 A CN 1093811A
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China
Prior art keywords
battery
control unit
remote control
time
period
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Pending
Application number
CN94102194A
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Chinese (zh)
Inventor
小·C·J·西蒙斯
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Technicolor USA Inc
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Thomson Consumer Electronics Inc
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Publication date
Application filed by Thomson Consumer Electronics Inc filed Critical Thomson Consumer Electronics Inc
Publication of CN1093811A publication Critical patent/CN1093811A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Selective Calling Equipment (AREA)

Abstract

Battery monitoring device in the remote control unit is measured charging circuit (C160) and is charged to the required time of predetermined level from discharge condition.Weak battery charges to the predetermined value required time to charging circuit, and is longer to the required time of predetermined value than charged fully battery charge.The duration of charging that the duration of charging relevant with a fully charged battery will go on record and be used to measure more subsequently.Variant as time of current measurement with the Measuring Time that is write down, and difference is when exceeding predetermined value, and weak battery alarm signal will produce.A kind of specific method is that alerting signal appears on the visible light LED (VL-ED).The another kind of method of specializing is weak battery alarm signal to be sent to controlled device get on to remind the user.

Description

Used low-voltage detection circuit on the remote control unit
The present invention generally relates to remote control unit, in particular to be a kind of remote control unit that the battery detection circuit is housed.
Now, it is very universal to be used to control the wireless remote control unit of the used electronic equipment of consumer.Most these class remote control unit all are that the infrared signal that will modulate under microprocessor controller control sends on their receiving equipment separately.Battery is as the required power supply of infrared transmitter circuit of microprocessor and these radio-cells.Regrettably, battery is limited serviceable life, promptly described meeting " depletion " and finally exhausting.When battery electric power is weak, can make remote control unit work in non-steady state in some cases, perhaps quit work fully.The data or the instruction of user input stored in the volatile random access memory of some remote control unit (RAM) lining, and RAM be by battery the voltage of confession keep.It should be noted that and to have spent the considerable time just its desired data or instruction to be stored in the remote control unit during the user sets.When the data in the storer of user storage at telepilot because battery electric power reduces or does not have electricity and when losing, it is very inconvenient that the user can feel.Clearly, weak battery must be changed in time to avoid loss of data.(usually, adopt " maintenance " capacitor, when changing " new " (promptly charging fully) battery, keep data sustaining voltage required on the RAM memory chip.) therefore just need a kind of reliable battery power cut detecting device, in order to detect the state that battery electric power weakens and to remind user's battery to lose efficacy.
Existing battery detection circuit can recognize that they are together sold with CTC 74 and CTC 81 colour television sets from the CRK 22A remote control unit that this RCA Corp. of the indiana Pohle of Indiana makes.In the sort of existing circuit, cell voltage can not by automatically, monitoring continuously, it just could be monitored pressing a certain specific keys.In addition, observation circuit also adopts its programmable unijunction transistor (PUT) that is biased on a certain specific voltage to operate, and this voltage is to be adjusted by a voltage divider that has adjustable potentiometer.Under this set, just must in factory, do to adjust in advance for guaranteeing normal running to voltage divider, this is because the characteristic of each PUT all can have some tiny difference, and because potentiometer must set in advance in correct scope.Clearly, omitting potentiometer is desirable with deducting the step of factory's pre-adjustment and the continuous monitoring to battery operated state being provided.
Battery monitoring device in remote control unit is measured its charging circuit and is charged to the required time of predetermined voltage from discharge condition.Weak battery request charging circuit be charged to predetermined voltage time must than duration of charging of a complete rechargeable battery long.The duration of charging of a well behaved battery goes on record and is used for and duration of charging measured value is thereafter made comparisons.When the duration of charging of record and difference different with the duration of charging of current measurement has exceeded predetermined value, then produce a weak battery alarm signal.A kind of concrete grammar is that alerting signal indicates by the visible light light emitting diode.Another kind of concrete grammar then is this weak battery alarm signal to be sent to controlled device get on, and reminds the user by the latter.
Fig. 1 is the remote control unit synoptic diagram that the battery status monitor is housed according to the present invention.
Fig. 2 and Fig. 3 are and the curve of the voltage of time correlation, are used for helping to understand the present invention.
Fig. 4 is a flowchart illustrations of simplifying, and shows the part of Fig. 1 middle controller 110 program codes.
With reference to Fig. 1, a remote control unit comprises a microcomputer 110, and the input that is used for reading keyboard promptly illustrates 120 parts, and the signal that need are transmitted is applied to the infrared light-emitting diode transmitter then, i.e. 140 parts in the diagram.Terminology used here " microcomputer ", what " controller " and " microprocessor " referred to all is with a part.We also can think like this, and the control function of microcomputer 110 may be carried out by an integrated circuit, particularly the sort of (being user's chip) of making for specific purposes, and simultaneously, terminology used here " controller " also wants to comprise this equipment.Microcomputer 110 is accepted those orders that starts from the user who is installed in keyboard 120 parts on the remote control unit.Microcomputer 110 comprises 114 and random-access storeies of 112, one (read-only) program storages of a CPU (central processing unit) (CPU) (ROM) (RAM) 116.ROM 114 can also can also may comprise the pre-programmed control code of the various device of different manufacturers in its outside in microcomputer 110 inside.If like this, RAM 116 may be used to the expansion of specific compression control routine collection, and these control routines are selected for each controlled device.Controller 110 also comprises a timer 119, and its function will be described below to some extent.Infrarede emitting diode transmitter device 140 comprises an infrarede emitting diode with LED 140 expression, driving transistors Q140, a current-limiting resistor R140 and R142, and a filter capacitor C140.
Keyboard 120 comprises: for example, 16 keys, be coupled to four drivings (that is: input) line of the output port D0～D3 of controller 110, be coupled to four sensings (that is: output) line of the input port S0～S3 of controller 110.When operation, high level of keyboard 120 usefulness (that is: logic level 1) signal scans to each bar drive wire D0 to D3 successively.After high level signal moved on to another from a drive wire, each bar sense line S0～S3 is then read over checked whether high level signal occurs.If above-mentioned situation, then a certain key in all keys necessarily is pressed on the keyboard 120, connects a loop from effective drive wire to effective sense line.Controller 110 can determine easily which key is pressed, and is right because each key only influences unique driving/sense line.
Frame of broken lines 118 comprises a switch SW 1, and it act as between positive voltage source and ground connection and switches.Though for simplicity, SW1 only draws with a mechanical switch form in the drawings, and these professional personnel can find that then it can be realized by the output of electronic switch such as bipolar transistor or field effect transistor (FET), controller 110.Battery status metering circuit 160 comprises one by the about 100K Ω of resistor R 160() and the about 0.001 μ F of capacitor C160() live part formed, and one by the about 10K Ω of resistor R 162() and the test section formed of switching transistor Q160.
What Fig. 2 showed is the voltage and the time history of the battery of charging fully." the 5V battery " of a nominal provide shown in Fig. 1 embodiment+supply voltage of V, and the diagrammatic sketch of Fig. 2 then comprises an AA battery and the serial connection diode (that is: virtual voltage should be 6V-0.7V=5.3V) of 4 1.5V.After about 1 microsecond, the positive step signal 210 of the 5V of about 0.1 microsecond of rise time is added on the charging circuit R160/C160.Capacitor C160 curve 215 as shown in drawings begins by resistor R 160 chargings.When the base voltage of transistor Q160 during near 400mv (about 9 microseconds), transistor Q160 begins conducting, and at its base voltage state (about 12 microseconds) that reaches capacity during near 500mv, curve 220 as shown in the figure.Therefore curve 220 is in the battery demonstration 5V voltage that high level (when capacitor C160 is charging) is measured at that time after about 11 microseconds.Transistor C160 has been actually the effect of a threshold voltage detecting device.
Fig. 3 is voltage and the time history of a weak battery (that is: 4V).After about 1 microsecond, the positive step signal 310 of the 4V of about 0.1 microsecond of rise time is added on the charging circuit R160/C160.Capacitor C160 begins by resistor R 160 charging, such as figure mark curve 315.When the base voltage of transistor Q160 reaches about 400mv (about 11 microseconds), transistor Q160 begins conducting, and the state that reaches capacity when its base voltage reaches about 500mv (about 14 microseconds), such as figure mark curve 320.Therefore, curve 320 reaches high level (capacitor C160 charges) and measures a weak battery (promptly only showing 4V voltage) at that time after about 13 milliseconds.It should be noted that lower at the anode-cathode voltage of weak battery, it needs the long duration of charging just can reach predetermined voltage level, this is because the charge rate dv/dt of weak battery is lower.That is to say, capacitor C160 will could charge fully with about 5 times of time constants.During this time constant be fix and be to determine by the numerical value of R160 and C160.Therefore weak battery charge rate is low is because capacitor 160 can only be charged to a lower magnitude of voltage in equal time.When measuring weak battery, the conducting of transistor Q160 is also than later, this is because the firing point of transistor Q160 is fixed basically, as Fig. 2, shown in 3, be approximately 500mv, simultaneously, because the voltage (being the forward voltage of transistor Q160) that is added on the capacitor 160 needs the long time because of lower charge rate.Therefore think that by the variation of measuring the duration of charging and the duration of charging of detection lengthening be an effective and reliable method that detects weak battery.
The actual firing point that should note transistor Q160 is not critical, because it all will automatically compensate when measuring each time.Also note that under the situation of weak battery the lower firing point of controller 110 will become lower.(that is: changing to the low pressure 1.1V that when 4V voltage is provided, is guaranteed from the low pressure 1.5V that when 5V voltage is provided, is guaranteed).The reduction of the low switching point of controller 110 is with about 100 nanoseconds of the conduction detection of further delay crystal pipe Q160.This also will be same helpful to the detection of weak battery.
In process flow diagram shown in Figure 4, process of measurement is in the input of the 400th step, herein for capacitor C160 is discharged fully so that prepare to measure battery status, microprocessor 110 is provided with switch SW 1 and applies a low level signal to capacitor C160 by resistor R 160.In the delay of one 100 microsecond of 410 steps execution, make capacitor C160 discharge.In 415 steps, switch SW 1 is switched to apply whole voltage and gives observation circuit 160, timer 119 startings simultaneously.Whether in 420 steps, checking has a low level signal to occur on the sense line S4.If do not present low level signal, then transistor Q160 does not also have conducting, and program continues circulation execution in 420 steps.If detect low level signal, then transistor Q160 conducting and carried out for 425 steps along "Yes" (YES) path order.In 425 steps, check and determine that whether this is to pass through for the first time, carries out this program.Whether (that is: remote control unit power up for the first time) be if then " very first time sign " (FIRST TIME FLAG) (being arranged in RAM116) will not be set up, and program will continue execution the 430th and go on foot.In 430 steps, timer 119 will be stopped and numerical value is read out, its data will be stored among the RAM116 and " very first time sign " also will be provided, and program will go on foot by the 450th and withdraw from.Each when remote control unit is operated, this program will be re-entered, and will measure in step 400～420.But in 425 steps, " very first time sign " will be set.This will make subsequent the 435th step of execution of program, and timer 119 stops, and its numerical value is read out, and the former numerical value of storing will be deducted from the current numerical value of reading.Go on foot if reading has difference and surpasses default definite value (as 2 microseconds) then carry out YES path to the 440 in proper order, and at this generation " weak battery alarm " (WEAK BATTERY ALARM) signal, program withdrawed from the 450th step.If in the reading and the default definite value indifference in the 435th step, then order is carried out the NO path and is quit a program in the 450th step.Can think that the function of TIMER 119 is under the situation of the real hardware timer of neither one, by the computations cycle, or the count value of successively decreasing in storer realizes.
In the first embodiment of the present invention, a VISIBLE LIGHT EMISSION diode (VLED), the VLED170 that marks among the figure by being applied on the VLED driving circuit 170, lights by " weak battery alarm " signal of a current-limiting resistor R170.VLED actuator device 170 comprises a visible light light emitting diode, among the figure 170, one driver transistor Q170 of the VLED that marks, current-limiting resistor R170 and R172 and a filter capacitor C170.
In second embodiment of the invention, the nonessential part of VLED driving arrangement 170.Because " weak battery alarm " signal is a remote control code signal, it is sent on the controlled device, and controlled device is equipped with weak battery alarm information or symbol is stored among its ROM, at this moment just warns the user battery weak state to occur.When controlled device is imaging equipment (that is: televisor, picture monitor, cassette video tape recorder (VCR) or CD videoplayer), then on its screen, will produce a warning message, inform that user's battery is about to use up.
Should also be noted that switch SW 1 can carry out its another function when controller 110 enters " sleep " state, promptly close metering circuit 160.This function is by switching SW1 a low level signal to be added to metering circuit 160, makes its no current flows and realizes.
Therefore, a kind of can providing effectively and the equipment of reliably battery status on the remote control unit being monitored described here.Though what show in Fig. 1 and Fig. 3 is the device that a kind of infrared remote control technology is specialized, but a professional should recognize that the present invention also can be applicable to launch on the remote control unit of radio frequency (RF) signal, and this remote control unit also belongs within the scope of the invention.Though what show among Fig. 1 and Fig. 3 is the device that a kind of infrared remote control technology is specialized, and will be appreciated that the present invention should not be limited in the application of remote control unit, we can say that it also can be applicable among other the battery powered apparatus.

Claims (8)

1, a kind of remote control unit that comprises the battery detection circuit that can monitor battery status, this unit comprises:
Be used to charge to the charging device (C160) of predetermined level;
Switchgear (SW1) is used for described charging device (C160) is received an end of described battery, cell voltage is added to described charging device;
Controller (110) is received described switchgear (SW1), in order to control described switchgear, described cell voltage is added on the described charging device (C160); And
Timer device (119), the time of a period of calculating under the control of described controller (110);
It is characterized in that:
Described controller (110), when when described switchgear (SW1) adds to described charging device (C160) with described cell voltage, beginning to count, when described charging device charges to described predetermined level till, calculate time of a period repeatedly;
When the time of described period exceeds predetermined value, produce the described controller (110) of an alerting signal.
2, according to claim 1 shake the control unit, it is characterized in that:
First position of described switchgear (SW1) is the position that makes described charging device (C160) discharge, and second position is the position that described cell voltage is added to described charging device.
3, according to claim 2 shake the control unit, it is characterized in that:
Described switchgear (SW1) is the delivery outlet of described controller.
4, according to the remote control unit of claim 3, it is characterized in that also comprising Threshold detection device (Q160), be used for going to detect the variation of the signal of cross-over connection on described charging device (C160) at described predetermined level place.
5, according to the remote control unit of claim 4, it is characterized in that:
Described Threshold detection device (Q160) is a transistor.
6, according to the remote control unit of claim 5, it is characterized in that:
Described alerting signal is added on the visible light light emitting diode (LED 140, and VLED 170).
7, according to the remote control unit of claim 5, it is characterized in that:
Described alerting signal is sent on the controlled device, and this equipment reminds user's battery to use up.
8, a kind of method of definite battery condition is characterized in that comprising the following steps:
Charging circuit (C160) is discharged;
The voltage of described battery is imposed on described charging circuit (C160);
Described charging circuit (C160) is charged to the required period of predetermined threshold level carry out timing;
Measuring back described time period of record for the first time;
Time period and the described time of having noted period that repeat described step and timing that each is new compare; And
If one of period of described new timing is than described period of having noted during a big predetermined value, then predeterminedly produce an alerting signal.
CN94102194A 1993-03-02 1994-03-01 Used low-voltage detection circuit on the remote control unit Pending CN1093811A (en)

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Application Number Priority Date Filing Date Title
US1809593A 1993-03-02 1993-03-02
US018,095 1993-03-02

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KR (1) KR940022356A (en)
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TW (1) TW223189B (en)

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CN101413992B (en) * 2007-10-19 2014-04-16 霍尼韦尔国际公司 Features to reduce low-battery reporting to security services at night
CN104062591A (en) * 2013-03-22 2014-09-24 海洋王（东莞）照明科技有限公司 Warning circuit for low voltage of battery
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Publication number Priority date Publication date Assignee Title
CN100448135C (en) * 2001-11-24 2008-12-31 艾默生网络能源有限公司 Float cut-off method for voltage of battery in UPS
CN101413992B (en) * 2007-10-19 2014-04-16 霍尼韦尔国际公司 Features to reduce low-battery reporting to security services at night
CN101923770B (en) * 2009-06-11 2013-01-09 鸿富锦精密工业（深圳）有限公司 Remote controller and electric quantity prompt system
CN104062591A (en) * 2013-03-22 2014-09-24 海洋王（东莞）照明科技有限公司 Warning circuit for low voltage of battery
CN104062591B (en) * 2013-03-22 2017-06-23 海洋王（东莞）照明科技有限公司 A kind of battery low-voltage warning circuit
CN106932726A (en) * 2017-02-28 2017-07-07 惠州市蓝微新源技术有限公司 A kind of battery core method for detecting health status

Also Published As

Publication number Publication date
JPH06276587A (en) 1994-09-30
KR940022356A (en) 1994-10-20
GB9403929D0 (en) 1994-04-20
TW223189B (en) 1994-05-01
GB2275783A (en) 1994-09-07

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