KR19990001696A - Battery status detection circuit - Google Patents

Abstract

According to the present invention, when an input signal for detecting a battery state is generated, the battery voltage can be compared with a constant voltage in a normal state to determine a good / bad state of the battery, and the result can be stored until the next detection request. After a predetermined time after the battery state detection circuit for automatically restoring the transient state of the circuit to enable the re-detection, the detection driver 100 for generating a detection operation signal by remote or direct input; A switching unit 700 generating a path switching signal of the battery to block the charging path by the charger of the battery when the detection operation signal is input; A comparator 300 for dividing the output voltage of the battery and comparing it with a predetermined reference voltage; A detection unit 400 generating a copy result of the comparison result of the comparison unit 300 after a predetermined time from when the switching signal is generated; A storage unit 600 for storing the comparison result when the copy signal is generated; A display unit 800 which blinks an optical element according to the stored state value; And a restoration unit 500 for initializing the remaining components except the storage unit 600 by restoring the switching unit 700 to an original state after a longer time than the predetermined time from the switching signal generation. It is possible to store the detection result, and even if it is restored to the state of charge after confirming the abnormality, there is no need of repeating the detection operation, and by restoring the circuit within a predetermined time with only elements such as a relay without a timer relay, the operating temperature characteristic is wide range. It is a very convenient and practical invention that satisfies and makes it possible to prevent the malfunction caused by external factors as much as possible.

Description

Battery status detection circuit

The present invention relates to a battery state detection circuit that detects and stores an abnormality of a battery. More particularly, the present invention relates to a battery state detection circuit that compares a voltage of the battery when an input signal for state detection is generated with a constant voltage of a charged normal state. The present invention relates to a battery state detection circuit in which a transient state of a circuit is automatically restored so that a good / bad state can be determined and the result can be stored until the next detection request, and the battery state can be redetected after a predetermined time after battery detection. .

In general, relays are electrical devices such as voltage, current, power, frequency, and the like, which serve to open and close electric power according to various input signals such as temperature and light. Contact relays, such as electronic relays, and semiconductor relays (transistors) And solid state relays such as relays and SCR relays, and are classified into circular relays, balanced relays, reed switches, and wire spring relays according to functions and structures. Relays have a wide range of uses, including telephone exchanges and general control. In particular, contact relays are actually widely used in battery condition detection circuits for supplying operational power to switchgear for distribution automation.

The switchgear for automatic switchgear is a device that divides the distribution preference so that power can be smoothly supplied by region in supplying power from the power supply side to each home. It is a device that automatically divides and connects the distribution line according to the opening and closing orders from the remote to supply power to the section not related to the failure.

1 is a block diagram of a conventional battery state detection circuit applied to an automatic switchgear for distribution, comprising: a detection driver 10 for generating a detection operation signal in response to a battery state confirmation command in the center or a manual request in the field; Switching unit 20 for applying a predetermined load to the battery by the operation signal; And a comparator 30 for comparing the output partial voltage of the battery with a reference voltage.

In the conventional battery state detection circuit configured as described above, when the detection operation signal is generated by inputting a key of the detection driving unit 10 at the center or through a power distribution control terminal device in the field, the switching unit ( 20) applies a certain load to the battery. The comparator 30 divides the output voltage of the battery by a predetermined ratio, compares the result with a reference voltage, and outputs the result. The output value is transmitted to a power distribution control terminal device to detect the state of the battery.

However, the conventional battery state detection circuit operating as described above outputs the state information of the battery only while the detection operation signal is applied, and the detected battery state information is not maintained when the remote control signal or key input is removed. In addition, the battery may not be recognized when the battery is bad.In addition, if the battery's status record fails after the recognition, or if the accuracy is not guaranteed, the battery state detection must be performed again. And difficulty in repairing.

Accordingly, there is a need for a new detection circuit that stores the state after battery state detection to solve the above problem, and the raised detection circuit initiates the state of the circuit within a period of time for redetection after state detection memory. A timer relay was needed to restore the state. However, while the distribution automation switch has to operate at a temperature of -25 to 70 degrees, the timer relay that needs to be connected to the circuit has a limited operating temperature of 0 to 60 degrees. There was a problem that can not implement the function to restore the initial state.

Accordingly, an object of the present invention is to provide a battery state detection circuit which performs battery state detection and stores the detection result until the next detection.

Another object of the present invention is to provide a battery state detection circuit which is configured without a timer and automatically recovers to an initial state for redetection.

1 is a schematic configuration diagram of a conventional battery state detection circuit,

2 is a schematic structural diagram of a preferred embodiment of a battery state detection circuit according to the present invention;

3 is a detailed circuit diagram of FIG. 2,

4 is a waveform diagram of an essential part of the battery state detection operation in the circuit of FIG.

Explanation of symbols on the main parts of the drawings

B: battery

L1, L2, ..., L7: Excitation coil of relay

R _L : Test load V _B : Voltage across battery

V _C : Voltage across capacitor Vref: Reference voltage

X_a: Contact switch shorted when X relay coil is excited

X_b: Contact switch shorted when X relay coil is not excited

10, 100: detection driving unit 20, 700: switching unit

30, 300: comparator 31, 41, 51: comparator

400: detecting unit 500: restoring unit

600: storage unit 800: display unit

Battery state detection circuit according to the present invention for achieving the above object, the switching means for switching the state of charge of the battery to the discharge state when a key input; Comparison means for comparing the proportional voltage of the battery discharge voltage with a predetermined reference voltage; Detection means for applying a comparison result of the comparison means to the storage means when a predetermined time has elapsed from the switching time of the switching means; And restoring means for re-switching the switching means when a predetermined time has elapsed from the time of application;

The battery state detecting circuit according to the present invention includes: a charging circuit for detecting the battery voltage at a predetermined time constant by the detecting means when the switching means is switched; A first comparator for comparing the charged voltage with a predetermined reference voltage; And a first relay driven by an output value of the first comparator, wherein the restoration means comprises: a second comparator comparing the charged voltage with a predetermined second reference voltage; And a second relay driven by the output value of the second comparator.

In the battery state detection circuit according to the present invention configured as described above, when the detection drive signal is input remotely or directly, the switching means cuts off the connection with the charger charged in the battery and at the same time loads the battery. Connect the power supply by the battery only. The comparing means divides the output voltage provided by the discharge of the battery at a constant ratio, compares it with a predetermined reference voltage, and outputs the comparison result in one of binary values. On the other hand, the detecting means waits until the voltage is charged to a predetermined value in the internal charging circuit, and then detects the state output from the comparing means at the instant of charging the predetermined value and applies it into the storage means. The storage means copies the comparison result of the comparison means and maintains the detection state. Like the detecting means, the restoring means restores the switching means to the original connection state when the voltage charged in the charging circuit reaches a specific value higher than the predetermined value, and thus the detecting means and the restoring means All of the voltage charged in the charging circuit is discharged to reduce the battery output voltage to a state capable of redetection.

Hereinafter, the configuration and operation of the preferred embodiment of the battery state detection circuit according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a schematic configuration diagram of a battery state detection circuit according to the present invention, applied to a switchgear for power distribution automation, including: a detection driver 100 generating a detection operation signal by remote or direct input; A switching unit 700 generating a path switching signal of the battery to block the charging path by the charger of the battery when the detection operation signal is input; A comparator 300 for dividing the output voltage of the battery and comparing it with a predetermined reference voltage; A detection unit 400 generating a copy result of the comparison result of the comparison unit 300 after a predetermined time from when the switching signal is generated; A storage unit 600 for storing the comparison result when the copy signal is generated; A display unit 800 which blinks an optical element according to the stored state value; And a restoration unit 500 for initializing the remaining components except for the storage unit 600 by restoring the switching unit 700 to its original state after a longer time than the predetermined time from the switching signal generation. It is configured to include.

3 is a detailed circuit diagram of the battery state detection circuit of FIG. 2 according to the present invention, wherein the detection driver 100 includes a remote control switch F_a and a push switch SW directly operated by an operator. The switching unit 700 includes: excitation coils L1 and L2 of the first and second relays connected to each other so that current flows when the switches F_a and SW are connected; A contact switch l_al of the first relay connected in series thereto and a contact switch 6_a of the sixth relay; A second contact switch 2_a connected to the charging paths of the battery B in parallel and maintaining parallel contact states with each other according to the current flow of the second excitation coil L2; and the second reverse contact switch 2_b. (Where the reverse contact switch refers to a switch that maintains an open state when a current flows in an excitation coil for opening and closing a contact switch); and the comparator 300 includes resistors R ₃₁ and R ₃₂ . A first voltage for comparing the output value of the battery B divided by the voltage with the reference voltage Vref obtained by properly dividing the voltage across the zener diode ZD, which is kept constant, by the resistors R ₃₄ and R ₃₅ . Comparator 31; An excitation coil L7 of a seventh relay in which current is blocked / conducted by the output value of the first comparator 31; And a contact switch (7_a); consist of, the detection unit 400, wherein the resistance across the first woman battery (B), for holding the contact state corresponding to the current flow or absence of the coil (L1), (R _41, R Another contact switch 1_a2 of the first relay connected in series with ₄₂ ); and a reverse contact switch 1_b; A capacitor (C) for charging a voltage at the time of shorting of the other contact switch (l_a2) of the first relay; A second comparator (41) for comparing the voltage (Vc) of the capacitor (C) with the voltage of the battery (B) divided by the resistors (R ₄₃ , R ₄₄ ); An excitation coil L5 of a fifth relay in which current is blocked / conducted by the output value of the second comparator 41; A fifth reverse contact switch 5_b connected in series with the first contact switch l_al and controlled to be opened and closed by the presence or absence of a current flow of the fifth excitation coil L5; And an excitation coil L3 of a third relay connected in series with the fifth reverse contact switch 5_b, wherein the storage unit 600 is opened and closed by the presence or absence of current flow of the third excitation coil L3. Controlled third reverse contact switch 3_b; An excitation coil L4 of the fourth relay; And a contact switch 4_al of the fourth relay; is connected in series, and the display 800 includes: another contact switch 4_a3 of the fourth relay; A light emitting diode (LED); and a resistor (R ₈₁ ); are connected in series, the restoration unit 500 is connected to the voltage (Vc) and the resistor (R ₅₁ , R ₅₂ ) of both ends of the capacitor (C) A third comparator 51 for comparing the voltages of the battery B divided by the battery; An excitation coil L6 of a sixth relay in which current is blocked / conducted by the output value of the third comparator 51; It consists of a feedback resistor (R ₅₃ ) is connected between the voltage divider input terminal and the output terminal of the third comparator 51, the diode is connected in the reverse direction, so that the negative peak voltage is not generated at both ends of the excitation coil.

3 is a waveform diagram of a main part of the circuit diagram of FIG. 2 over time, and the operation of the battery state detection circuit according to the present invention will be described in detail with reference to the waveform diagram of FIG. 3.

In order to perform the state detection of the battery supplying power to the switchgear automation switch, the switch F_a is operated remotely from the center through a distribution control terminal device, or a push switch (SW) installed in each switch control device. The inspector will press directly. When the switches F_a and SW are short-circuited (t1), current flows to the first excitation coil L1 and the second excitation coil L2, respectively, thereby forming a charging path of the battery B. The second reverse contact switch 2_b is opened to stop charging to the battery B, and the second contact switch 2_a is shorted to apply a predetermined load R _L to the battery B. In addition, the other first contact switch l_a2 is short-circuited by the current flow of the first excitation coil L1, and the first reverse contact switch l_b is opened to the capacitor C through the resistor R ₄₁ . As the charging path is formed, charging of the capacitor C gradually begins to occur.

The voltage output from the battery B is divided by the resistors R ₃₁ and R ₃₂ and input to the non-inverting terminal of the first comparator 31, whereby the zener diode ZD and the voltage divider R _{34 are} divided. , A predetermined reference voltage Vref set by R ₃₅ and input to the inverting terminal is compared by the first comparator 31. In the state where the charger is charging the battery B, since the reference voltage Vref is set so that the voltage input to the non-inverting terminal of the first comparator 31 is large, the output value of the first comparator 31. Is a signal of logic 1 (hereinafter referred to as 'HIGH'), and thus no current flows in the seventh excitation coil L7. The same is true even when the divided value is larger than the reference voltage Vref even after the battery B is switched to the output voltage. However, when the charged voltage is low, the output of the first comparator 31 is converted into a signal of logic 0 (hereinafter, referred to as 'LOW') so that a current flows in the seventh excitation coil L7. The seventh contact switch 7_a is switched to a short-circuit state to temporarily store an abnormal state of the battery B. (Fig. 4 (s))

On the other hand, the capacitor (C) starts to charge from the time (t1) when the switch (F_a, SW) is pressed, the charging voltage gradually increases, so that the voltage at both ends (Vc) is input to the resistors (R ₄₃ , R ₄₄ ) At the moment when the voltage becomes greater than the set voltage (t2), the output value of the second comparator 41 is switched so that a current flows through the excitation coil L5 of the fifth relay, before the current flows through the fifth excitation coil L5. Since the first contact switch l_a and the fifth reverse contact switch 5_b are short-circuited and a current flows through the third excitation coil L3 (Fig. 4 (iii)), the first switch in the storage unit 600 is used. The third reverse contact switch 3_b maintains an open state, and therefore, no current flows in the fourth excitation coil L4, and the fourth contact switch 4_al is open. As the current flows to L5), the fifth reverse contact switch 5_b is opened and the current of the third excitation coil L3 is opened. By being cut off and the third reverse-contact switch (3_b) is a short-circuited state.

When the third reverse contact switch 3_b is short-circuited, the contact state of the seventh contact switch 7_a temporarily storing the comparison result of the first comparator 31, that is, the abnormality value of the battery B, The fourth switch is copied to the contact switches 4_al, 4_a2, and 4_a3 of the fourth relay. If the seventh contact switch 7_a is shorted when the third contact switch 3_b is shorted, the fourth excitation coil L4. When the current flows through the fourth contact switch 4_al, which is also short-circuited (Fig. 4 (o)), if the seventh contact switch 7_a is opened, the fourth contact switch 4_al is similarly opened. ((′ ') Of FIG. 4), if a current flows in the fourth excitation coil L4 to indicate the battery B or more, the other contact switch 4_a3 of the fourth relay is short-circuited. Light emitting diode (LED) to indicate abnormal condition until key input for detecting next battery (B) status To light On the other hand, if the state another contact switch (4_a2) of the fourth relay is short-circuited is input to the control distribution terminal apparatus, it will continue to display the detection state until the next detection.

The voltage divider value input to the non-inverting terminal of the third comparator 51 is greater than the voltage divider value input to the non-inverting terminal of the second comparator 41. The resistors R ₄₁ , R ₄₂ , R ₅₁ , R ₅₂ , R ₅₃ ) value is determined,

(Where r is the internal resistance of the sixth excitation coil L6). The output value of the third comparator 51 is not switched even at a time point t2 when the output value of the second comparator 41 is inverted. When the voltage Vc charged in the capacitor C continues to increase and becomes greater than the voltage (V _{2, on} ) of the non-inverting pressure terminal of the third comparator 51 (t3), the third The output of the comparator 51 becomes LOW, so that a current flows through the sixth excitation coil L6 connected to the output terminal (Fig. 4 (ㅁ)).

When current flows through the sixth excitation coil L6, the sixth reverse contact switch 6_b in the switching unit 700 opens to block the current flow of the first and second excitation coils L1 and L2. (B) of FIG. 4, accordingly, the contact state of the second contact point and the reverse contact switch 2_a, 2_b is switched to recharge the battery B by the charger. The first contact switch l_a2 is opened and the first reverse contact switch l_b is shorted so that the capacitor C stops charging (t3) (Fig. 4 (c)) and discharge starts. As soon as a current flows through the sixth excitation coil L6, the non-inverting input voltages V _{2 and off} of the third comparator 51 are changed as follows.

Since this value is set to have a value lower than the non-inverting input voltage V ₁ of the second comparator 41 previously set, even if the capacitor C starts to discharge, the output value of the third comparator is not immediately reduced but low. Keep the value.

While the capacitor C is being discharged, the instant when the both ends voltage Vc becomes smaller than the input partial pressure V _{1 of} the second comparator 41 (t4), the output value of the second comparator 41 becomes HIGH again. While switching, the current flow of the fifth excitation coil L5 is interrupted (FIG. 4 (d)), thereby maintaining the original short-circuit state of the fifth reverse contact switch 5_b, and the capacitor C Further, when the discharge voltage is smaller than the input partial pressures V _{2 and OFF} of the third comparator 51 whose voltage Vc at both ends thereof is changed (t 5), the current is blocked together with the current cutoff of the sixth excitation coil L 6. The 6 reverse contact switch 6_b is also restored to its original short-circuit state (Fig. 4 (W)), and the abnormality of the battery B is maintained in the contact state with the fourth contact switch 4_a2, and redetected. Will be completely restored to its original state.

In the above embodiment, the resistors R ₅₁ , R ₅₂ , and R ₅₃ used in the restoring unit 500 are connected to the internal resistance r of the sixth excitation coil L6 serving as a pull-up. In order to minimize the effect of the internal resistance (r) by selecting a value of at least 10 times or more, it is preferable to set the voltage (Vc) of both ends of the second comparator 41 variable.

The battery state detection circuit according to the present invention configured and acts as described above can store the detection result and check whether or not the battery is defective even if it is restored to the charged state after checking whether there is an abnormality, so that the detection operation does not need to be repeated. By restoring the circuit within a certain time with only a device such as a relay without a relay, the field of application can be further expanded and the operating temperature characteristic can be satisfied in a wide range to prevent malfunction due to external factors as much as possible. It is a practical invention.

Claims (5)

Switching means for switching the state of charge of the battery to a state of discharge upon key input; Comparison means for comparing the proportional voltage of the battery discharge voltage with a predetermined reference voltage; Storage means for maintaining any of the applied states in the binary state; Detection means for applying a comparison result of the comparison means to the storage means when a predetermined time has elapsed from the switching time of the switching means; And And restoring means for re-switching the switching means when a predetermined time has elapsed from the application point of time. The method of claim 1, The detection means, A charging circuit for charging the battery voltage at a predetermined time constant during the switching of the switching means; A first comparator for comparing a voltage charged in the charging circuit with a predetermined input partial voltage of the battery voltage; And And a first relay driven by the output value of the first comparator. The restoration means, A second comparator comparing a voltage charged in the charging circuit with a predetermined input partial voltage of the battery voltage; And And a second relay driven by the output value of the second comparator. The method of claim 2, The constant input partial pressure of the first comparator is set smaller than the constant input partial pressure of the second comparator, First and second resistors connected to both ends of the battery to set a constant input voltage divider of the second comparator, and a third resistor connected between an output terminal of the second comparator and the constant voltage divider input terminal; And the battery partial voltage applied to the second comparator at the time of magnetization is set to be smaller than the applied partial pressure at the time of non-magnetization of the second relay. The method of claim 2, And the storage means comprises: a relay circuit for maintaining a comparison result state applied in connection with switching the opening and closing of the first relay in a contact state. The method of claim 4, wherein The relay circuit is composed of two first and second contact switches and one excitation coil connected in series, The first contact switch is operated in conjunction with the opening and closing of the first relay, the second contact switch is operated in connection with the presence or absence of current flow of the excitation coil, and parallel to the contact switch indicating the comparison result of the comparison means. Battery status detection circuit, characterized in that connected to.