JPS62101119A - Pulse amplitude comparison circuit correcting initial deviation - Google Patents

Abstract

PURPOSE:To discriminate deterioration in a battery by correcting the amplitude of two input pulse amplitudes having an initial deviation and detecting the change in the amplitude produced later to check the state of pulse change of a terminal voltage of the battery caused in charging or discharging, e.g., two sets of secondary batteries at the same time. CONSTITUTION:A microcomputer 10 decreases little by little a voltage of other input terminal through the 1st switch means 6 in a direction canceling a bias voltage fed to one input terminal of a comparator 9 and finds out a point where the peak of two input pulses is coincident to correct the deviation of the pulse amplitude. Since the two input pules are compared while the common mode voltage at two input terminals is decreased alternately by a prescribed value, one input pulse is being changed and whether or not the amplitude exceeds the said prescribed value is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for detecting changes in the characteristics of two electronic components of the same type, such that changes in the characteristics of the electronic component can be captured as changes in the amplitude of pulses generated by the electronic component. This relates to a pulse amplitude comparison circuit that corrects the initial deviation of the pulses generated by each electronic component when comparing. For example, it examines the pulse component of the battery terminal voltage that occurs when charging and discharging a secondary battery in a pulsed manner. It is used for things like ko-shichi.

Background of the Invention In recent years, various types of secondary batteries have been used as power supplies for power outage compensation, and as the reliability of electronic circuit devices has improved, information on the deterioration of secondary battery power supplies has become required. Ta. For example, in sealed Ni-Cd batteries, it has been found that there is a strong correlation between battery deterioration and internal resistance. It can be understood as a pulse-like change in voltage. Taking advantage of this characteristic, use 2
There is a method for detecting battery deterioration by dividing the next battery into two sets of assembled batteries, charging or discharging these batteries in common in a pulsed manner, and comparing the pulse components of the terminal voltages of the assembled batteries. It is proposed separately.

Problem to be Solved by the Invention However, even if the internal resistance of a secondary battery is a normal product with no deterioration, there is a considerable deviation, and for this reason, the initial deviation of the internal resistance, in other words, the terminal voltage of the assembled battery It is necessary to correct the pulse component of the battery while the battery is normal, and then detect changes due to subsequent deterioration.

However, conventionally, a pulse amplitude comparison circuit suitable for such signal processing has not been provided. The present invention provides a pulse amplitude comparison circuit capable of correcting an initial deviation in the amplitudes of two input pulse signals so as to be suitable for this type of signal processing.

Means for Solving the Problem To achieve this object, the pulse amplitude comparator circuit for correcting the initial deviation of the present invention is provided simultaneously by a microcomputer and a first control signal supplied from said microcomputer. a comparator to which two input pulses configured as above are respectively supplied to the input terminals via capacitors; and means for biasing a common mode voltage supplied to one input terminal of the comparator;
A first control signal connected to the other input terminal of the comparator via a resistor and having a pulse width from a time preceding the first control signal to the first control signal. and a third control signal supplied from the microcomputer,
and second switch means for alternately changing the common mode voltages of the two input terminals of the comparator by a fixed value every time the first control signal is generated.

Effect: With this configuration, the microcomputer gradually lowers the voltage at the other input terminal of the comparator through the first switch means in a direction that cancels out the bias voltage applied to the other input terminal, thereby reducing the voltage of the two input pulses. By finding the point where the peaks coincide, deviations in pulse amplitude are corrected. Next, the second switch means compares the two input pulses while lowering the common mode voltage of the two input terminals by a fixed value alternately, so that one input pulse changes and the common mode voltage of the two input terminals is lowered by a fixed value. It will be detected whether or not it exceeds.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a pulse amplitude comparison circuit for correcting initial deviation in an embodiment of the present invention.

In FIG. 1, reference numerals 1 and 2 are pulse input sources, which simultaneously generate pulses in response to a first control signal 100 supplied from a microcomputer 10. In FIG. 3 and 4 are capacitors, respectively, and input sources 1 and 2
The DC component of is cut, and only the 1712 minute pulse is supplied to the input terminal of the comparator 9. A biasing means 5 biases the common mode voltage at one input terminal of the comparator 9 by an amount corresponding to the maximum value of initial deviation correction. Reference numeral 6 denotes a first switch means, which biases the common mode voltage at the other input terminal of the comparator 9 by a second control signal 200 in accordance with the correction width of the initial correction. Reference numeral 7 denotes a second switch means which stops supplying the third control signal 300 during the correction of the 1 bar initial deviation, does not have any effect on the two input terminals of the comparator 9, and controls the input pulse after correction. In the state where amplitude comparison is performed, the common mode voltage of one of the input terminals of the comparator 9 is reduced by a value corresponding to the permissible limit of the imaging width difference of the pulse to be measured by the third control signal 300. . 8 is a resistor, 9 is a comparator, and 10 is a microcomputer. 100.200 and 30
0 is the first one supplied from the microcomputer 10;
second and third control signals.

The operation of the pulse amplitude comparator circuit for correcting the initial deviation configured as described above will be explained below in Figures 1 to 3.
This will be explained with reference to the figures. First, correction of the initial deviation of pulse amplitude will be explained.

FIG. 2 shows the waveforms of the second and third control signals of the eleventh circuit and the input terminal voltage of the comparator 9. In particular, the input terminal voltage waveform of (d) is easy to understand because the two waveforms overlap. The time axis is shown shifted slightly as shown. First, as shown in (C), (A), and (C), generation of the third control signal supplied from the microcomputer IO is stopped. In this state, inside the second switch means 7, the switch contact is connected to (b). Therefore, the common code voltage at one input terminal of the comparator 9 (inverted phase input terminal in FIG. 1) is biased in the negative direction by the bias means 5.

Therefore, the output of the comparator 9 is "High". Next, a second control signal 200 is supplied to the first switch means 6 as shown in FIG. 2(b). As a result, part of the charge stored in the capacitor 3 is discharged through the resistor 8, etc., and the voltage at the other input terminal of the comparator 9 (the positive phase input terminal in FIG. 1) is as shown in FIG. 2(d). As such, it begins to decline at a gentle slope. Seconds after the generation of the second control signal, two input pulses are generated simultaneously by the first control signal 100 shown in FIG. Given. As a result, the voltage waveforms at the two input terminals become as shown in FIG. 2(d). While t is small, the voltage drop at the positive input terminal of the comparator 9 caused by the first switch means 6 is small, and the output of the comparator 9 is still "Hjgh". The above operation is repeated periodically, and each time an input pulse arrives, t
As the value of is increased by a constant value, the voltage drop at the positive-phase input terminal caused by the first switching means 6 gradually increases until it reaches a voltage drop as shown by the broken line in FIG. 2(d). Then, the magnitude relationship of the input terminal voltage of the comparator 9 at the time of the arrival of the pulse is reversed.This state is caused by the input pulse amplitude of the input source I being added to the bias voltage from the bias means 5 at the negative phase input terminal of the comparator 9. On the other hand, the positive phase input terminal is supplied with a voltage obtained by adding the input pulse amplitude of the input source 2 to the voltage reduction caused by the first switch means 6, and the latter is higher than the former. This is the point when the price has fallen slightly, that is,
It can be said that both are approximately equal. The value of t at this point is t. The microcomputer neck 1'll-Mon J, A, Kneeze.
, 1μ, 1μ・'1゛'/+rXzu;: (see, ;'I
+knee~=-ffi), -□1=::=:, 11. ．． ,
．． By applying this to the comparison of the amplitudes of the human pulses of 4+2Q/-, it is possible to correct the initial deviation of the two input pulse amplitudes.

The operation of a comparator circuit that identifies whether a subsequent change in two input pulses is within predetermined tolerance limits will now be described. FIG. 3 shows voltage waveforms similar to those in FIG. 2 in the comparison mode of operation. The third control signal 300 that controls the second switch means 7 is a control signal (A) that turns ON the contact (A) corresponding to the switch contacts (A) and (C) inside the second switch means 7. It is composed of two signals, a) and an M control signal (c) which turns on the contact (c), and these are in opposite phases to each other, as shown in FIG. 3(c). Further, this third control signal is inverted every time an input pulse arrives.

Now, when the switch contact (c) in the second switch means 7 is turned on by the third control signal (c), a constant current flows through the second resistor 11, and the positive phase input of the comparator 9 The common mode voltage at the terminal decreases by a certain value. This constant reduction amount is equal to the value of the tolerance limit for the difference between the two input pulse amplitudes. Therefore, immediately after correcting the initial deviation, the comparator 9
As shown on the left side of FIG. 3(d), the voltage waveform of the two input terminals shows that in the pulse portion, the voltage of the positive phase input terminal is smaller than that of the negative phase input terminal by the allowable limit value, and the output of the comparator 9 is 'Low' seven.

If the amplitude of the input pulse supplied to the negative phase input terminal changes in this state and the amount of change exceeds the permissible limit, the magnitude relationship between the two input terminal voltages of the comparator 9 will be reversed. The output of comparator 9 is “High,
h? becomes. As a result of the above, it can be seen that when the third control signal (c) is supplied, the output of the comparator 9 is normal when it is "Low" and abnormal when it is "High".

Next, when the third control signal (a) is supplied and the switch contact (a) in the second switch means 7 is turned on, the voltage is regulated through the third resistor 12 which is equal to the second resistor 11. As the current flows, the common mode voltage at the negative phase input terminal of the comparator 9 decreases by a certain value, and the amount of decrease is equal to the allowable limit of the difference between the two input pulse amplitudes. Therefore, immediately after correcting the initial deviation, the comparator 9
As shown on the right side of FIG. 3(d), the voltage waveform of the two input terminals shows that in the pulse portion, the voltage of the negative phase input terminal is smaller than that of the positive phase input terminal by the allowable limit value, and the voltage of the comparator 9 is lower than that of the positive phase input terminal. In this state, if the amplitude of the input pulse supplied to the positive phase input terminal changes in the direction of increasing and the amount of change exceeds the allowable limit,
The magnitude relationship between the two input terminal voltages of the comparator 9 is reversed, and the output of the comparator 9 becomes "LOW". As a result, when the third control signal (A) is supplied, the output of the comparator 9 is normal when it is “High”, ° “Low”
It can be seen that an abnormality occurs when . Finally, the microcomputer 10 determines the output logic of the comparator 9 in response to the third control signals (a) and (c), and outputs whether the difference in amplitude between the two input pulses is normal or abnormal.

Note that in this embodiment, for convenience of explanation, 2 of the comparator 9 is
Although two input terminals have been specified, the present invention is not limited to this.

Effects of the Invention As described above, the present invention provides two input pulses having different amplitudes in an initial state to the input terminals of the comparator through respective capacitors, and a bias means connected to one input terminal of the comparator; After correcting the amplitude of the two high-power pulses by means of a first switch means connected via a resistor to the other input terminal, a second switch means alternately applies a voltage equal to the permissible limit value to the two input terminals of the comparator. By applying a change in common mode voltage and configuring the microcomputer to judge the output logic of the comparator, the amplitude of two input pulses having an initial deviation is corrected, and then the subsequent change in amplitude is detected. For example, it is possible to determine battery deterioration by examining the pulse-like changes in battery terminal voltage that occur when two sets of secondary batteries are simultaneously charged or discharged. Ahsu

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing a time chart of various control signals for correcting the initial deviation, and a diagram showing the input terminal voltage waveform of the comparator.
FIG. 3 is a diagram showing a time chart of various control signals and an input terminal voltage waveform of a comparator when performing a comparison operation of self-pulse amplitudes. 1...Input source, 2...Input source, 3...Capacitor, 4...
- Capacitor, 5... Bias means, 6... First switch means, 7... Second switch means, 8... Resistor, 9
... Comparator, 10 ... Microcomputer, 1
1...Second resistance, 12...Third resistance.

Claims (1)

[Claims] a microcomputer, a comparator to which two input pulses configured to arrive simultaneously by a first control signal supplied from the microcomputer are supplied to input terminals via capacitors, and one of the comparators; means for biasing a common mode voltage supplied to an input terminal; and a pulse connected to the other input terminal of the comparator via a resistor and from a time preceding the first control signal to the first control signal. a first switch means controlled by a second control signal having a width and a third control signal supplied from the microcomputer, each time the first control signal is generated; and second switch means for alternately changing the common mode voltage of the terminal by a fixed value, the microcomputer comprising:
The generation of the third control signal is stopped, and the common mode voltage is maintained in a state where no change is applied to either of the two input terminals of the comparator, and the pulse width of the second control signal is set to the same value as that of the second control signal. a correction function that sequentially supplies the control signal so as to increase by a constant value each time the control signal is generated, and stores the pulse width of the second control signal when the output of the comparator is inverted; and the third control The signal causes the second
a pulse amplitude for controlling the switch means to alternately change the common mode voltage of the two input terminals of the comparator by a constant value, and determining the output logic of the comparator in response to switching of the second switch means; A pulse amplitude comparison circuit for correcting an initial deviation, characterized in that it has a comparison function.