JP2661173B2 - Battery status display circuit - Google Patents

Description

The present invention relates to a battery status display circuit used for an electronic circuit.

Such electronic circuits are typically radios such as radio selective calling receivers, mobile radiotelephones, mobile radio transceivers, and the like. Such an electronic circuit is controllably activated by a battery. Specifically, the electronic circuit is operatively controlled by a current supplied from the battery. The battery state display circuit is for displaying a consumption state of the battery.

2. Description of the Related Art A conventional battery state display circuit includes a voltage meter connected to a pair of terminals of the battery. The voltmeter is
The potential difference between the terminals is measured, and the potential difference is displayed as the state of consumption of the battery. Generally, in the battery, the voltage drop characteristic with respect to the total current consumed by the electronic circuit is not linear. The total amount of current consumed by the electronic circuit is semantically equal to the amount of energy consumed by the electronic circuit as the current.

[Problems to be Solved by the Invention] Therefore, in the conventional battery state display circuit, the user of the electronic circuit refers to the display of the voltmeter, and for how long the electronic circuit is operated by the battery. There is a drawback that it is difficult to judge and guess whether it can be put in a state.

SUMMARY OF THE INVENTION An object of the present invention is to provide a battery state display circuit used in an electronic circuit that can be controlled to operate by a battery and that can accurately display the consumption state of the battery.

It is another object of the present invention to provide a battery status display circuit of the type described above, which is suitable for indicating how long the electronic circuit can be operated by the battery. .

Other objects of the invention will become apparent as the description of the invention proceeds.

[Means for Solving the Problems] According to the present invention, an electronic circuit (50) that is controllably operated by a current of varying level supplied from a battery (51) is used. A battery state display circuit for displaying a consumption state, a pulse generation means (52) connected to the electronic circuit, for generating a basic pulse train having a pulse repetition cycle that changes in proportion to the level in response to the current; Temperature detecting means (57) for detecting an ambient temperature of the battery and outputting a detection signal representing the ambient temperature; and a pulse of the basic pulse train, which increases in proportion to the ambient temperature in response to the detection signal. A first clock pulse train having a pulse repetition period longer than the repetition period and each pulse having a pulse width substantially equal to the pulse width of each pulse of the basic pulse train. A first clock generation means (58), a logic processing means (61 and / or 63) for processing the basic pulse train and the first clock pulse train according to a predetermined logic, and outputting a logic-processed pulse train; Connected to the processing means and given an initial count value,
Counting means (54) for subtracting and counting the initial count value from the reduced count value in response to the logically processed pulse train, and outputting a count signal representing the reduced count value; And a display means (56) for displaying the consumption state.

[Example] Next, an example of the present invention will be described with reference to the drawings.

First, with reference to FIG. 1, a description will be given of a first battery state display circuit on which the present invention is based. This first battery status display circuit is used in an electronic circuit which is a mobile radio telephone in the example shown. This mobile radio telephone has an antenna
11, Antenna coupler (antenna duplexer) 12, Receiving circuit 1
3, transmission circuit 14, local oscillator 15, speaker (receiver) 1
6. It includes a microphone unit (transmitter) 17, a control unit 18, and a key input unit 19 that can be manually operated. When the battery 20 is mounted on the mobile radio telephone, the receiving circuit 13, the transmitting circuit
14, local oscillator 15, speaker unit 17, microphone unit 17,
A current can be supplied to the control unit 18 and the key input unit 19.

The mobile radio telephone is put into an operating state so as to be controllable by the key input unit 19. Specifically, when the key input unit 19 is operated, the mobile radio telephone is placed in a controllable operation standby (ie, first) mode. During communication, the mobile radiotelephone automatically switches to the active call (ie, second) mode. The standby mode and the call mode of the mobile radio telephone will be described below.

The mobile radiotelephone is normally in a standby mode under the control of the control unit 18. In the standby mode, the control unit 18 drives the receiving circuit 13 and the local oscillating unit 15, and sets each of the receiving circuit 13 and the local oscillating unit 15 to the operating state. At this time, the local oscillator 15 supplies the receiving circuit 13 with a frequency signal designating a control channel. That is, the receiving circuit 13 can receive, via the antenna 11 and the antenna coupler 12, an input signal transmitted from the fixed (or base) station via the control channel.

In response to the input signal, the receiving circuit 13 sends the input signal to the control unit 18. When the control unit 18 receives the input signal,
The control unit 18 determines whether or not the input signal is a calling signal unique to the mobile radio telephone. Only when the input signal is a calling signal specific to this mobile radio telephone, the control unit 18
Represents not only the receiving circuit 13 and the local oscillation unit 15 but also the transmitting unit 14
, A receiving circuit 13, a local oscillation unit 15, and a transmission unit 14.
Are put into operation. At this time, the local oscillation unit 15 supplies a frequency signal designating one of the communication (ie, communication) channels to the reception circuit 13 and the transmission circuit 14. as a result,
This mobile radiotelephone is in a call mode. In the call mode, the mobile radio telephone has a microphone section.
A call signal can be transmitted to the fixed station or a call signal can be received from the fixed station via the one of the call channels using the speaker 17 or the speaker unit 16.
As is well known in the art, the controller 18 also drives a tone generator (not shown) when it determines that the input signal is a paging signal specific to this mobile radiotelephone. Cause the generator to ring.

The mobile radiotelephone can be in the call mode even when the key input unit 19 is manually operated by the user of the mobile radiotelephone to start communication with the fixed station.
When the key input unit 19 is operated to start communication with the fixed station, the key input unit 19 generates a communication start signal. In response to the communication start signal, the control unit 18 transmits the transmission circuit 14 in addition to the reception circuit 13 and the local oscillation unit 15 in the same manner as described above.
Drive.

Anyway, the transmitting unit 14 does not enter the operating state in the standby mode, but enters the operating state in the call mode.
This mobile radio telephone consumes a first amount of electricity in the standby mode and a second amount of electricity in the call mode. The first
Is smaller than the second electric quantity. here,
The first amount of electricity per unit time is referred to as a first amount of current, and the second amount of electricity per unit time is referred to as a second amount of current. The first current amount and the second current amount are, for example, 200 mA and 2 A, respectively.

The battery state display circuit is for displaying the consumption state of the battery 20. The battery state display circuit stores first and second current amount signals representing the first and second current amounts when the mobile radiotelephone is set to be controllable in a standby mode and a talk mode, respectively. The storage unit 21 is included. In summary, the storage unit 21 stores a current amount signal indicating the amount of current when the mobile radio telephone is in a controllable operation state.

The battery status display circuit further includes a measurement circuit 22 connected to the mobile radiotelephone for measuring a total time interval during which the telephone is in operation. The measuring circuit 22 thereby outputs a time period signal representing the total time interval. More specifically, measurement circuit 22
Is connected to the mobile radiotelephone, accumulates or sums the total time interval, and outputs the time period signal.
And a reset circuit 24 for resetting the time period signal to an initial period signal representing zero as the total time interval when is removed from the mobile radiotelephone.

Alternatively, the reset operation for the accumulation circuit 23 may be performed by a manual operation of the user of the mobile radio telephone when a new battery is attached to the mobile radio telephone as the battery 20 instead of the old battery. Therefore, when the user manually operates the key input unit 19 to execute the reset operation for the accumulation circuit 23, the key input unit 19 outputs a reset signal. In response to the reset signal, the control unit 18 executes a reset operation for the accumulation circuit 23 instead of the reset circuit 24.

The accumulating circuit 23 of the measuring circuit 22 includes first and second partial measuring circuits 25 and 26. The first partial measurement circuit 25
It is connected to the mobile radiotelephone and measures a first total time interval during which the mobile radiotelephone is in a standby (ie, first) mode. This first partial measurement circuit 25
As a result, a first time period signal indicating the first total time interval is output. Similarly, the second partial measurement circuit
26 is connected to the mobile radiotelephone and measures a second total time interval during which the mobile radiotelephone is in a call (ie, second) mode. The second partial measuring circuit 26 thereby outputs a second time period signal indicating the second total time interval. Each of the first and second partial measurement circuits 25 and 26 is achieved by, for example, a timer.

The arithmetic circuit 27 is connected to the storage unit 21 and the measurement circuit 22,
The current amount signal is multiplied by the time period signal to output a multiplication result signal representing a product of the current amount and the total time interval. This multiplication result signal is used as a state signal indicating the calculated state of battery 20.

Specifically, the arithmetic circuit 27 includes first and second multipliers 29 and
30 and an adder 31 are included. The first multiplier 29 is connected to the storage unit 21 and the first partial measurement circuit 25, and multiplies the first current amount signal and the first time period signal. The first multiplier 29 thereby outputs a first multiplication result signal representing a first product of the first current amount and the first total time interval.

Similarly, the second multiplier 30 is connected to the storage unit 21 and the second partial measurement circuit 26, and multiplies the second current amount signal and the second time period signal. Accordingly, the second multiplier 30 outputs a second multiplication result signal representing a second product of the second current amount and the second total time interval.

The adder 31 is connected to the first and second multipliers 29 and 30. An adder 31 adds the first and second multiplication result signals and causes the state signal to indicate the sum of the first and second products.

As described above, the combination of the storage unit 21 and the arithmetic circuit 27 functions as a processing circuit connected to the measuring circuit 22. The processing circuit calculates a state of the battery 20 from the total time interval in response to the time period signal supplied from the measurement circuit 22, and outputs a state signal representing the calculated state. .

For example, the display unit 32, which is a visible display device, displays the consumption state based on the calculated state in response to the state signal. For example, the display unit 32 displays, using a bar graph, the sum of the first and second products as the amount of power consumption (energy consumption) consumed by the mobile radio telephone up to the present time. In the bar graph, the bars are such that when the amount of consumed electricity is large, the length of the bar is shortened,
Is displayed. Therefore, the length of the bar is maximized when a new battery is installed in the mobile radiotelephone instead of the battery 20 shown in FIG. The use limit mark indicating the use limit of the battery 20 may be further displayed on the display unit 32.

The value of the percentage (percentage) of the consumed power (energy consumption) with respect to the maximum electricity (maximum energy) of the battery 20 may be displayed instead of the bar graph. Instead, a value indicating the percentage of the remaining energy of the battery 20 with respect to the maximum energy may be displayed. Also,
The display unit 32 may display how long the mobile radiotelephone can be operated by the battery 20. Specifically, the display unit 32 may display how long the mobile radio telephone can operate in the standby mode or the call mode by using the battery.

When the battery 20 is attached to the mobile radiotelephone, the current flows from the battery 20 to the storage unit 21, the accumulation circuit 23, the reset circuit 2
4. It is obvious that the data is supplied to the arithmetic circuit 27 and the display unit 32.

Next, with reference to FIG. 2, a description will be given of a second battery state display circuit on which the present invention is based. This second battery state display circuit is also used in the mobile radio telephone.
This battery state display circuit is the same as the battery state display circuit of FIG. 1 except for the following points. That is, a different arithmetic circuit 33 is included in the control unit 18 instead of the arithmetic circuit 27 of FIG. 1, and the current consumption total circuit 34 is replaced with an arithmetic circuit instead of the measurement circuit 22.
It is connected to 33.

The arithmetic circuit 33 is connected to the storage unit 21, and while the mobile radiotelephone is in a controllable operating state, the current amount signal is stored in the storage circuit 21 at predetermined time intervals, for example, at unit time intervals. It includes a readout circuit 35 for reading out periodically. The read circuit 35 outputs a read result signal in which the current amount signal appears periodically. The unit time is, for example, one second.

At this time, the reading circuit 35 outputs the first current amount signal from the storage circuit 21 at the predetermined time interval while the mobile radiotelephone is in the controllable standby (ie, first) mode. Is read periodically. This read circuit 35
As a result, a first read result signal in which the first current amount signal appears periodically is output. While the mobile radiotelephone is in a controllably speaking (ie, second) mode, the readout circuit 35 transmits the second current amount signal from the storage circuit 21 periodically at the predetermined time interval. , Thereby outputting a second read result signal in which the second current amount signal appears periodically.

The current consumption summation circuit 34 includes a current consumption accumulation circuit 39 that sums the current amounts in response to the read result signal and outputs a total signal representing the total of the current amounts.
The reset circuit 40 is connected to the current consumption accumulating circuit 39, and resets the total signal to an initial signal representing zero.

Specifically, the current consumption accumulation circuit 39 of the current consumption summation circuit 34 includes first and second partial summation circuits 41 and 42. The first partial summing circuit 41 sums the first current amount in response to the first read result signal, and
Output a first sum signal representing the first sum of the current amounts of the currents. Similarly, a second partial summing circuit sums the second current amount in response to the second read result signal, and generates a second sum representing a second sum of the second current amount. Output a signal. Each of the first and second partial sum circuits 41 and 42 is achieved by, for example, an up counter.

The adder circuit 43 includes first and second partial sum circuits 41 and 42.
And adding the first and second sum signals to cause the status signal to indicate the sum of the first and second sums. In other words, the addition circuit 43
In response to the sum signal, it acts as a supply circuit that supplies the sum signal to the display unit 32 as the status signal.

As described above, the combination of the arithmetic circuit 33 and the current consumption totaling circuit 34 calculates the state of the battery 20 from the current amount in response to the current amount signal, and outputs a state signal representing the calculated state. It acts as a current processing circuit.

Next, with reference to FIG. 3, a description will be given of a third battery state display circuit which is a basis of the present invention. This third battery state display circuit is used for another electronic circuit 50. The electronic circuit 50 is controllably put into operation by a current supplied from the battery 51 and having a changing level. The battery 51 is, for example, a secondary battery such as a nickel-cadmium battery.

This battery state display circuit displays the consumption state of the battery 51, and includes a pulse generation circuit connected to the electronic circuit 50.
Contains 52. A pulse generating circuit responsive to the current;
52 generates a pulse train with a pulse repetition period that decreases in proportion to the level. Here, when the current level is 1 amp, the pulse generation circuit 52 operates at 10
Assume that pulses have been generated. Here, T indicates a positive integer. In this case, the pulse repetition period is T /
Equal to 10. When the level of the current is 1/10 amp, the pulse repetition period is equal to T.

The mode signal generation circuit 53 generates a discharge mode signal of a logic “0” level when the electronic circuit 50 is in an operating state. When the electronic circuit 50 is in the operating state, the battery 51
The battery enters a discharge mode in which the current is being supplied to the electronic circuit 50. When the battery 51 is placed in a charging mode in which the battery 51 is being charged, the mode signal generating circuit 53 generates a charging mode signal of a logic “1” level. The battery 51 is set to the charging mode by the user of the electronic circuit 50 when the electronic circuit 50 is not in the operating state.

Up / down counter (addition / subtraction counting circuit) 54
Are connected to a pulse generation circuit 52 and a mode signal generation circuit 53. When receiving the charge mode signal, the up /
The down counter 54 functions as an up counter as described below. Upon receiving the discharge mode signal,
The down counter 54 operates as a down counter as described below.

The up / down counter 54 has a clock input terminal CL
K, a signal input terminal U / D, and an output terminal Qn. The clock input terminal and the signal input terminal are connected to a pulse generation circuit 52 and a mode signal generation circuit 53, respectively. Assume that when the battery 51 is put into the charging mode by the user of the electronic circuit 50, the up / down counter 54 has some special count value. In this case, the up / down counter 54 supplies the charging mode signal and the pulse train to the signal input terminal U / D and the clock input terminal CLK, respectively. As a result, the up / down counter 54 adds and counts the special count value to the increased count value in response to the pulse train, and outputs an added count signal representing the increased count value to the output terminal. When the charging of the battery 51 is completed, the increased count value indicates the maximum count value.

When the battery 51 enters the discharge mode, the up / down counter 54 supplies the discharge mode signal and the pulse train to a signal input terminal U / D and a clock input terminal CLK, respectively. At this time, the maximum count value is an initial count value. The up / down counter 54 counts down the initial count value to the reduced count value in response to the pulse train, and provides a reduced count signal representing the reduced count value to the output terminal. Each of the addition counting signal and the subtraction counting signal is simply referred to as a new counting signal.

Here, the combination of the pulse generation circuit 52 and the up / down counter 54 makes the electronic circuit 50 in the discharge mode.
Should be construed as acting as a measurement circuit connected to the This measuring circuit measures the total time interval during which the electronic circuit 50 is in the operating state (that is, the discharging mode of the battery 51). This total time interval is
Indicated by the reduced count value of the up / down counter 54. The measuring circuit thereby outputs a time period signal representing the total time interval. The up / down counter 54 outputs the counting signal as the time period signal.

The decision circuit 55 is connected to the up / down counter 54 and is provided with a plurality of reference signals, each representing a reference count value, the reference count value of which will be revealed shortly. . The determination circuit 55 determines whether the increased count value has reached any one of the reference count values in response to the count signal, and determines whether the reference count value has reached the increased count value. Output a state signal representing one of the following. Similarly, the determination circuit 55 determines whether the reduced count value has reached any one of the reference count values, and outputs the status signal.

As described above, the determination circuit 55 calculates the state of the battery 51 from the total time interval (ie, the reduced count value) in response to the period interval signal (ie, the count signal), and calculates the state of the battery 51. It operates as a processing circuit for outputting a state signal indicating the state of the state.

In response to the status signal, the display unit 56 displays a value of a percentage of the remaining energy amount of the battery 51 with respect to the maximum energy amount of the battery 51. The maximum energy amount corresponds to the maximum count value obtained by the up / down counter 54 when the charging operation of the battery 51 ends. The remaining energy amount corresponds to one of the reference count values reached by either the increased count value or the decreased count value. As described above, the display unit 56 includes the display unit shown in FIG.
Similarly to 32, the consumption state is displayed based on the calculated state in response to the state signal.

The first to third battery state display circuits described above do not take into account that the self-discharge component and capacity of the battery change depending on the ambient temperature. The battery state display circuit according to the embodiment of the present invention described below takes into account that the self-discharge component and the capacity of the battery change depending on the ambient temperature, and enables accurate display of the battery consumption state. is there.

Referring to FIG. 4, a battery status display circuit according to one embodiment of the present invention is used in the electronic circuit 50 described above. In this battery state display circuit, the same parts as those in FIG. 3 are indicated by the same reference numerals. The battery status display circuit further includes first and second correction circuits that are described below.

First, the first correction circuit will be described. Electronic circuit 50
Is activated, the battery 51 enters the discharge mode where it supplies the current to the electronic circuit 50, as described above. However, not all of the energy of the battery 51 is used as the current supplied to the electronic circuit 50. In fact, when the battery 51 is placed in the discharge mode, it is inevitable that a part of the energy of the battery 51 is lost as a self-discharge component. Moreover, the self-discharge component changes according to the ambient temperature of the battery 51. The self-discharge component increases as the ambient temperature increases.

The first correction circuit is for correcting such a change in the self-discharge component. The first correction circuit includes a temperature sensor 57 that detects the ambient temperature and outputs a detection signal.

In response to the detection signal, the first clock generator 58
A first clock pulse train having a pulse repetition period that increases in proportion to the ambient temperature is generated. The pulse width of each pulse of the first clock pulse train is determined by a pulse generation circuit.
The pulse width generated by 52 is substantially equal to the pulse width of each pulse of the pulse train. The pulse repetition period of the first clock pulse train is considerably longer than the pulse repetition period of the pulse train generated by the pulse generation circuit 52. This is because the self-discharge component is considerably smaller than the energy of the battery 51 used as a current supplied to the electronic circuit 50. The first clock generator 58
For example, a CR oscillator having a capacitor and a resistor.

The first AND circuit 59 is connected directly to the first clock generator 58 and to the mode signal generation circuit 53 via an inverter circuit 60. In response to the first clock pulse train and the discharge mode signal of logic "0" level,
AND circuit 59 performs an AND operation of the first clock pulse train and the inverted signal of the discharge mode signal, and outputs the first A
Outputs ND signal. The first AND signal is supplied to a clock input terminal of an up / down counter 54 via an OR circuit 61.
Given to CLK.

Thus, the first correction circuit corrects a change in the self-discharge component of the battery 51.

Next, the second correction circuit will be described. This second
The correction circuit for correcting the change in the capacity of the battery 51.

Here, such a change in the battery capacity will be described with reference to FIG. Battery capacity varies with ambient temperature. When the ambient temperature is 20 ° C., the battery capacity becomes maximum. Battery capacity decreases as ambient temperature drops below and above 20 ° C.

Returning to FIG. 4, the second clock generator 62 is connected to the temperature sensor 57 and the mode signal generation circuit 53. In response to the detection signal and the charge mode signal or the discharge mode signal, the second clock generator 62 generates a second pulse train having a predetermined pulse repetition period. The predetermined pulse repetition period of the second clock pulse train is selected to be significantly longer than the pulse repetition period of the pulse train generated by the pulse generation circuit 52. The pulse width of each pulse of the second clock pulse train varies as described below, depending on the ambient temperature and depending on whether the second clock generator 62 has received a charge mode signal or a discharge mode signal. .

The pulse width of each pulse in the second clock pulse train will be described with reference to FIG. First, the case where the battery 51 (FIG. 4) is in the charging mode will be described. When the ambient temperature is lower than normal temperature, each pulse of the second clock pulse train has a pulse width Wcl as shown in the figure.
have. When the ambient temperature is room temperature, the second
Has a pulse width Wcn as shown in FIG. When the ambient temperature is higher than room temperature, it has a pulse width Wch as shown.

Each of the pulse widths Wcl and Wch is shorter than the pulse width Wcn.
The pulse widths Wcl, Wcn and Wch are controlled by the detection signal output by the temperature sensor 57 (FIG. 4).

When the ambient temperature changes from normal temperature to high temperature while the battery 51 is being charged, the battery capacity decreases as described above. This is equivalent to a decrease in the amount of current stored as chemical energy in the battery 51.

Next, the case where the battery 51 is placed in the discharge mode will be described. When the ambient temperature is low, each pulse of the second clock pulse train has a pulse width Wdl as shown in the figure.
have. When the ambient temperature is room temperature, the second
Each pulse of the clock pulse train has a pulse width as shown
Have a Wdn. When the ambient temperature equals the high temperature, each pulse of the second clock pulse train has a pulse width Wdh as shown.

Each of pulse widths Wdl and Wdh is longer than pulse width Wdn. The pulse widths Wdl, Wdn, and Wdh are controlled by the detection signal output by the temperature sensor 57. The pulse width Wdn is substantially equal to the pulse width Wcn.

Returning to FIG. 4, the second AND circuit 63 is connected to the second clock generator 62 and the pulse generation circuit 52.
In response to the second clock pulse train and the pulse train generated by the pulse generation circuit 52, a second AND circuit 63 causes the second clock pulse train and the pulse generation circuit 52 to operate.
AND operation with the pulse train generated by the above is performed. The second AND circuit 63 thereby outputs a second AND signal.

In response to the second AND signal and the first AND signal output by the first AND circuit 59, the OR circuit 6
1 performs an OR operation of the first and second AND signals,
Outputs OR signal. This OR signal is supplied to the clock input terminal of the up / down counter 54.

Thus, the second correction circuit corrects a change in the capacity of the battery 51 according to the ambient temperature.

Although the present invention has been described with reference to one embodiment, those skilled in the art can easily implement the present invention in various other ways. For example, the present invention is applicable to a radio selective call receiver that is placed in a standby mode controllably by a battery. The invention is further applicable to mobile radiotelephones that are controllably placed in multiple transmission modes. In each of the above transmission modes, the mobile radiotelephone requires different power or electrical energy to transmit a transmission signal. In any case, the scope of the present invention is by no means limited by the number of operating modes of the electronic circuit.

[Effects of the Invention] As described above, according to the present invention, there is provided a battery state display circuit which is used in an electronic circuit which can be controlled and operated by a battery and which can accurately display the consumption state of the battery. Obtainable. Further according to the invention, for how long the electronic circuit is powered by the battery,
A battery status display circuit of the type described above, suitable for indicating whether it can be put into an operating state, can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a mobile radiotelephone including a first battery state display circuit as a base of the present invention, and FIG. 2 is a second battery state display circuit as a base of the present invention. FIG. 3 is a block diagram of an electronic circuit including a third battery state display circuit based on the present invention, and FIG. 4 is a block diagram of a battery state display circuit according to one embodiment of the present invention. FIG. 5 is a diagram for explaining the operation of the battery status display circuit of the electronic circuit of FIG. 4, and FIG. 6 is another diagram of the battery status display circuit of the electronic circuit of FIG. It is a figure for explaining operation. 11 ... antenna, 12 ... antenna coupler, 13 ... reception circuit, 14 ... transmission circuit, 15 ... local oscillation unit, 16 ... speaker unit, 17 ... microphone unit, 18 ... control unit, 19 ...... Key input unit, 20 ... Battery, 21 ... Storage unit, 22 ... Measurement circuit, 23 ... Cumulative circuit, 24 ... Reset circuit, 25 ... First
, The second partial measurement circuit, 27, the arithmetic circuit, 29, the first multiplier, 30, the second multiplier, 31
... Adder, 32, display section, 33, arithmetic circuit, 34, current consumption total circuit, 35, readout circuit, 39, current consumption accumulation circuit, 40, reset circuit, 41, first , A partial sum circuit, 42... A second partial sum circuit, 43.
…… Electronic circuit, 51… Battery, 52 …… Pulse generation circuit, 53
... A mode signal generation circuit, 54 an up / down counter, 55 a determination circuit, 56 a display unit, 57 a temperature sensor, 58 a first clock generator, 59 a first AND. Circuit, 60 ... Inverter circuit, 61 ... OR circuit, 62 ... Second
Clock generator, 63 ... second AND circuit.

Claims (3)

(57) [Claims] 1. A battery status display circuit for use in an electronic circuit (50) which is controllably operated by a current of varying level supplied from a battery (51) and which displays a consumption status of the battery. A pulse generation means (52) connected to the electronic circuit for generating a basic pulse train having a pulse repetition cycle that changes in proportion to the level in response to the current; and detecting an ambient temperature of the battery, Temperature detection means (57) for outputting a detection signal representing an ambient temperature; and a pulse repetition cycle longer than the pulse repetition cycle of the basic pulse train, which increases in proportion to the ambient temperature in response to the detection signal, And first clock generating means (58) wherein each pulse generates a first clock pulse train having a pulse width substantially equal to the pulse width of each pulse of the basic pulse train; A logic processing means (61 and / or 63) for processing the basic pulse train and the first clock pulse train in accordance with a predetermined logic and outputting a logic-processed pulse train; Given
Counting means (54) for subtracting the initial count value from the reduced count value in response to the logically processed pulse train, and outputting a count signal representing the reduced count value; A display means (56) for displaying the consumption state. 2. The logic processing means performs an OR operation on the basic pulse train and the first clock pulse train in response to the basic pulse train and the first clock pulse train, and outputs the OR-operated pulse train to the logic. The battery state display circuit according to claim 1, further comprising an OR operation unit (61) that outputs the processed pulse train. 3. The battery state display circuit according to claim 1, wherein the battery state display circuit is responsive to the detection signal and has a predetermined pulse repetition period longer than a pulse repetition period of the first clock pulse train. And a second clock generating means (62) for generating a second clock pulse train having a pulse width in which each pulse increases in proportion to the absolute value of the difference between the ambient temperature and the reference temperature. The logic processing unit performs an AND operation on the basic pulse train and the second clock pulse train in response to the basic pulse train and the second clock pulse train, and outputs an AND-operated pulse train.
AND operation means (63), in response to the AND-operated pulse train and the first clock pulse train, performs an OR operation of the AND-operated pulse train and the first clock pulse train, and performs an OR-operated pulse train A battery state display circuit, comprising: an OR operation means (61) for outputting the pulse train as the logically processed pulse train.