KR100230124B1 - Battery-state checking circuit - Google Patents

Abstract

The present invention compares the voltage of a battery when an input signal for detecting a battery state is detected with a constant reference voltage when it is charged to determine whether the battery is good or bad and stores the result until the next detection request. A battery state detection circuit for automatically restoring a transient state of a circuit to enable redetection of a battery state after a predetermined time, the detection driver 100 generating a detection operation signal by remote or direct pressure; 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 its 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 recovers to the charged state after checking for abnormality, it is not necessary to repeat the detection operation, and the circuit can be restored within a predetermined time with only elements such as a relay without a timer relay, so that the operating temperature characteristic is wide. By satisfying at, it is possible to prevent malfunction 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, a relay is a device that serves to open and close electric power according to various input signals such as temperature and light, as well as electrical signals such as voltage, current, power, and frequency, and includes contact relays such as electronic relays, and semiconductor relays ( Solid-state relays such as transistor 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 widely used in battery condition detection circuits for supplying the operating power of switchgear for distribution automation.

The automatic switchgear for power distribution is a device that divides power distribution lines so that power can be smoothly supplied by region in supplying electric power from a power supply side to each home, and separates a fault section when a failure occurs between the switch and the switch. It is a device that automatically divides and connects the distribution line according to the opening / closing instructions 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 comparison unit 30 for comparing a reference voltage, which is a comparison / determination criterion, between the output partial pressure of the battery and the quantity / defect of the state of charge of the battery.

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 comparison unit 30 divides the output voltage of the battery at 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 of the switchgear may not be recognized, and the battery status of the switchgear may need to be detected again if an error occurs or the accuracy of the battery status record is not guaranteed even after the battery is recognized. And difficulty in repairing.

Therefore, in order to solve the above problem, the necessity of a new detection circuit for storing the state after the battery state detection has been proposed, and the proposed detection circuit initializes the state of the circuit within a certain period for redetection after the state detection memory. A timer relay was needed to restore the state of. 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 a good / bad state detection of a battery and stores the detection result until the next detection. Will be

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 configuration diagram according to a preferred embodiment of the battery state detection circuit according to the present invention,

3 is a detailed circuit diagram of FIG.

4 is a waveform diagram of the main part when the battery state detection operation is performed in the circuit of FIG.

* Explanation of symbols for main parts of the drawings

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

RL: Test load VB: Voltage across battery

Vc: 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 part 700: switching part

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

400: detection unit 500: restoration unit

600: storage unit 800: display unit

Battery state detection circuit according to the present invention for achieving the above object, the switching unit for switching the state of charge of the battery to the discharge state when the key input; Comparison means for comparing a proportional voltage of the battery discharge voltage with a reference voltage serving as a comparison / determination criterion of a good / bad state of the battery; Memory means for maintaining any applied state of the binary state so as to maintain and store the applied battery state signal when a good or bad state signal of the battery according to the comparison result of the comparing means is applied; Detection means for interrupting an output path of the battery status signal and 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 detecting means may include a charging circuit for charging a voltage supplied from the battery at a predetermined time constant during 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 a first relay driven by an output value of the first comparator to interrupt a path of the comparison result signal applied to the storage means, wherein the recovery means includes a voltage charged in the charging circuit and the battery voltage. A second comparator for comparing a constant input partial pressure of the second comparator; And a second relay driven by the output value of the second comparator to switch the switching means again.

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 rate, compares the predetermined voltage with a reference voltage as a reference for determining whether the battery is in a good state or a poor state, and compares the comparison result with a binary value. Output in one state. 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 accordingly the restoring 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 an automatic switchgear for distribution, comprising: a 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 the output voltage of the battery with a predetermined reference voltage serving as a reference for the quantity / defective state of the battery; 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. Consists of.

3 is a detailed circuit diagram of the battery state detection circuit of FIG. 2 according to the present invention.

The detection driving unit 100 is composed of a remote control switch (F_a) and the push switch (SW) directly operated by the operator, the switching unit 700 is a current when the switch (F_a, SW) is connected Excitation coils L1 and L2 of the first and second relays connected to flow, the contact switch 1_al of the first relay connected in series, the contact switch 6_b of the sixth relay, and the charging path of the battery B The second contact switch 2_a and the second reverse contact switch 2_b (herein, the reverse contact switch is connected in parallel and in parallel to each other to maintain contact states opposite to each other according to the current flow of the second excitation coil L2). It refers to a switch that maintains an open state when an electric current flows through an excitation coil that opens and closes a contact switch.).

The comparator 300 properly adjusts the output value of the battery B divided by the resistors R31 and R32 and the voltage between both ends of the zener diode ZD to be kept constant by the resistors R34 and R35. A first comparator 31 for comparing the divided reference voltage Vref; An excitation coil L7 of the seventh relay in which current is blocked / conducted by the output value of the first comparator 31; And a contact switch 7_a.

The detector 400 maintains the contact state according to the presence or absence of current flow of the first excitation coil L1, and the other contact switch of the first relay connected in series with the resistors R41 and R42 at both ends of the battery B. 1_a2 and reverse contact switch 1_b; A capacitor (C) for charging a voltage at the time of shorting of the other contact switch (1_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 (R43, R44); 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 1_a1 and controlled to be opened and closed by the presence or absence of current flow of the fifth excitation coil L5; The excitation coil L3 of the third relay connected in series with the fifth reverse contact switch 5_b.

The storage unit 600 is a contact point of the third reverse contact switch 3_b, the excitation coil L4 of the fourth relay, and the fourth relay, which are opened and closed by the current flow of the third excitation coil L3. The switches 4_a1 are connected in series with each other.

The display unit 800 is configured by connecting the other contact switch 4_a3, the light emitting diode (LED), and the resistor R81 of the fourth relay to each other in series, and the restoration unit 500 includes the capacitor C. The current is blocked / conducted by an output value of the third comparator 51 and the third comparator 51 comparing the voltage Vc at both ends thereof and the voltage of the battery B divided by the resistors R51 and R52. The excitation coil L6 of the sixth relay and the feedback resistor R53 connected between the voltage divider input terminal and the output terminal of the third comparator 51.

In addition, both ends of the excitation coils are connected with a diode in a reverse direction so that a negative peak voltage is not generated.

3 is a waveform diagram of a main part of the second circuit diagram 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.

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 the distribution control terminal device, or the 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 RL to the battery B. In addition, the other first contact switch 1_a2 is short-circuited by the current flow of the first excitation coil L1, and the first reverse contact switch 1_b is opened to charge the capacitor C through the resistor R41. As the path is formed, charging of the capacitor C gradually begins to occur.

The voltage output from the battery B is divided by the resistors R31 and R32 and input to the non-inverting terminal of the first comparator 31, whereby the zener diode ZD and the divided resistors R34 and R35 are provided. The reference voltage Vref (set as a reference for the quantity / failure of the state of charge of the battery), which is set by 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 therefore, no current flows through the seventh excitation coil L7 (Fig. 4 (s)). The same is true even when the divided output value is larger than the reference voltage Vref even after the charger output voltage is cut off and the output voltage of the battery B is switched. 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 and the seventh. The contact switch 7_a is switched to a short-circuit state to temporarily store an abnormal state of the battery B. (4th (g))

On the other hand, the capacitor C starts to be charged from the time t1 when the switches F_a and SW are pressed, and gradually increases the charging voltage, so that the voltage Vc at both ends thereof is greater than the voltage inputted to the resistors R43 and R44. At the moment 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, the first contact switch 1_a and the fifth reverse contact switch 5_b are short-circuited and the current flows through the third excitation coil L3 ( (I) of FIG. 4) The third reverse contact switch 3_b in the storage unit 600 maintains an open state, so that no current flows through the fourth excitation coil L4, and thus the fourth contact switch 4_a1. Is open. However, as the current flows through the fifth excitation coil L5, the fifth reverse contact switch 5_b is opened, and the current of the third excitation coil L3 is cut off, thereby blocking the third reverse contact switch 3_b. ) Becomes a short circuit state.

When the third reverse contact switch 3_b is shorted, 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_a1, 4_a2, and 4_a3 of the fourth relay. If the seventh contact switch 7_a is shorted at the time of shorting of the third contact switch 3_b, the fourth excitation coil L4. When the current flows, the fourth contact switch 4_a1 is also short-circuited (Fig. 4 (o)), and if the seventh contact switch 7_a is opened, the fourth contact switch 4_a1 is also in the open state. (Fig. 4 (o)) If a current flows in the fourth excitation coil L4 and indicates a battery B abnormality, the other contact switch 4_a3 of the fourth relay is short-circuited. As long as the light emitting diode (LED) lights up to indicate the abnormal condition until the key input for detecting the battery (B) status , A fourth state in which another contact switch (4_a2) of the short-circuit relay is input to the control distribution terminal, the detected condition is still displayed until the next detection.

The resistance (R41, R42, R51, R53) values are determined such that the divided voltage value input to the non-inverting terminal of the third comparator 51 is greater than the divided voltage value input to the non-inverting terminal of the second comparator 41. So,

(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 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 larger than the voltage of the non-inverting input terminal of the third comparator 51 (V2, on) (t3), the third comparator ( The output of 51) becomes LOW, so that a current flows through the sixth excitation coil L6 connected to the output terminal ((W) in FIG. 4).

When a 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, the contact state of the second and reverse contact switches 2_a and 2_b is switched so that the battery B is recharged by a charger. The first contact switch 1_a2 is opened and the first reverse contact switch 1_b is shorted so that the capacitor C stops charging (t3) ((c) in FIG. 4) and discharge starts. As soon as a current flows through the sixth excitation coil L6, the non-inverting input voltages V2 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 V1 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 voltage V1 of the second comparator 41 (t4), the output value of the second comparator 41 is switched to HIGH again. While blocking the residual flow of the fifth excitation coil (L5) (Fig. 4 (d)) to maintain the short-circuit state of the original state of the fifth reverse contact switch (5_b), the capacitor (C) is further When the discharge voltage is lower than the input partial pressures V2 and OFF of the third comparator 51 whose voltage VC is changed (t5) (t5), the sixth reverse contact with the current cutoff of the sixth excitation coil L6 is performed. The switch 6_b is also restored to its original short-circuit state (Fig. 4 (h)), so that the abnormality of the battery B is maintained in the contact state with the fourth contact switch 4-a2 for redetection. It will be completely restored to its original state.

In the above embodiment, the resistors R51, R52, and R53 used in the restoring unit 500 are affected by the internal resistance r of the sixth excitation coil L6, which performs a pull-up role. In order to minimize, it is preferable that the voltage Vc of both ends of the second comparator 41 is variably set by selecting at least 10 times more than the value of the internal resistance r.

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, thereby making it possible to prevent malfunction due to external factors as much as possible. It is a practical invention.

Claims (5)

Switching means for switching a state of charge of the battery into a discharge state when a key is input; Comparison means for comparing a proportional voltage of the battery discharge voltage with a reference voltage as a criterion for determining whether the battery is in a good or bad state; Memory means for maintaining any applied state of the binary state so as to maintain and store the applied battery state signal when a good or bad state signal of the battery according to the comparison result of the comparing means is applied; Detection means for interrupting an output path of the battery status signal and 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 to a charged state when a predetermined time has elapsed from the application of the battery state signal by the detecting means. 2. The apparatus of claim 1, wherein the detecting means comprises: a charging circuit for charging a voltage supplied from the battery at a predetermined time constant when the switching means is switched; A first comparator for comparing a voltage charged in the charging circuit with a predetermined input partial voltage of the battery voltage; And a first relay driven by an output value of the first comparator to interrupt a path of the comparison result signal applied to the storage means, wherein the recovery means includes a voltage charged in the charging circuit and the battery. A second comparator for comparing a constant input partial pressure of a voltage; And a second relay driven by the output value of the second comparator to switch the switching means again. The method of claim 2, wherein the constant input partial pressure of the first comparator is set to be smaller than the constant input partial pressure of the second comparator, and is connected to both ends of the battery to set the constant input partial pressure of the second comparator. And a third resistor connected between the second resistor and the output terminal of the second comparator and the constant voltage input terminal, wherein the partial voltage of the battery applied to the second comparator at the time of magnetization of the second relay is equal to that of the second relay. A battery state detection circuit, characterized in that it is set smaller than the applied partial pressure of the time. 3. The battery state detection circuit according to claim 2, wherein the storage means comprises a relay circuit which maintains a comparison result state applied in association with the switching of the first relay in a contact state. 5. The relay circuit of claim 4, wherein the relay circuit comprises two first and second contact switches and one excitation coil connected in series, and the first contact switch operates in connection with opening and closing of the first relay. And the second contact switch operates in connection with the presence or absence of current flow of the excitation coil, and is connected in parallel with a contact switch indicating a comparison result of the comparing means.

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