KR20130057884A - Battery short protection apparatus - Google Patents

Battery short protection apparatus Download PDF

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Publication number
KR20130057884A
KR20130057884A KR1020110123854A KR20110123854A KR20130057884A KR 20130057884 A KR20130057884 A KR 20130057884A KR 1020110123854 A KR1020110123854 A KR 1020110123854A KR 20110123854 A KR20110123854 A KR 20110123854A KR 20130057884 A KR20130057884 A KR 20130057884A
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KR
South Korea
Prior art keywords
battery short
signal
voltage
pwm
shunt resistor
Prior art date
Application number
KR1020110123854A
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Korean (ko)
Inventor
강성훈
Original Assignee
현대모비스 주식회사
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Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020110123854A priority Critical patent/KR20130057884A/en
Publication of KR20130057884A publication Critical patent/KR20130057884A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)

Abstract

PURPOSE: A battery short protective gear is provided to prevent secondary malfunction by switching off a pulse width modulation(PWM) control signal immediately as the malfunction is detected. CONSTITUTION: A battery short detecting unit(201) detects the end-to-end voltage of a shunt resistor. The shunt resistor is connected to a source of a switching transistor. The battery short detecting unit outputs a battery short signal. The output is generated when the voltage is greater than the specific threshold value. A PWM signal control unit(202) switches off a PWM signal when the battery short signal is received. [Reference numerals] (AA) Load; (BB) PWM control signal; (CC) Battery short signal; (DD) Filter; (EE) Amplifier

Description

Battery short protection device {BATTERY SHORT PROTECTION APPARATUS}

The present invention relates to a battery short protection device, and more particularly, to a battery short protection device for detecting when the battery short occurs in the pulse width modulation control device and to prevent the occurrence of secondary failure.

In general, the pulse width modulation (PWM) control device can be used to control the rotational speed of the motor or to control the opening / closing amount of the valve. And the amount of current flowing through the load in accordance with the PWM control signal from the control unit.

In addition, constant current control is possible by measuring the amount of current and adjusting the PWM value with feedback. For reference, a shunt resistor is generally used for measuring the amount of current. That is, the amount of current may be measured by calculating the voltage value applied to the shunt resistor, or the battery short may be detected.

FIG. 1 is an exemplary view showing a schematic configuration of a PWM control apparatus having a conventional battery short detection circuit. As shown therein, a battery power supply (VCC) and a load (for example, a motor and a valve) 100 may include a switching transistor ( It is connected in series with the drain of Q1) and the source is grounded through the shunt resistor SR1. The voltage between both ends of the shunt resistor SR1 is detected and amplified by the amplifier AMP1, and the voltage amplified and output by the amplifier AMP1. It comprises a filter (F1) for removing the noise from, and receives a voltage output through the filter (F1) to the A / D (Analog to Digital) terminal is configured as a microcontroller (not shown) for sensing the voltage.

Here, the microcontroller (not shown) may calculate the amount of current using the sensed voltage, and performs PWM control by controlling the switching transistor Q1 on / off with feedback.

The microcontroller (not shown) measures the current at the falling edge of the PWM control signal by software, and if the measured current amount is maintained above a certain threshold (e.g., above 2A) for a certain time Detecting a fault (eg battery short) has occurred. When a failure is detected as described above, the microcontroller turns off the PWM control signal.

However, the current measurement method in the conventional PWM control device as described above occurs at least two or more problems.

When the microcontroller performs the ADC (Analog to Digital Convert) function, it does not perform any other software functions. Therefore, it cannot be sensed at all times. Therefore, the microcontroller performs at the falling edge of the PWM control pulse. Therefore, if a failure occurs before the falling edge point, it takes a long time to detect the failure. That is, at least one cycle of the PWM pulses takes time to detect a failure.

Since it takes a long time to detect the failure and turn off the PWM control signal, there is a secondary problem in that stress is applied to the shunt resistor, thereby shortening the life of the device.

Since the current is sensed by software, a time delay may occur between applying a sensing command at the falling edge of the PWM control signal. In other words, even if the sensing command is output from the falling edge, if the software processing is delayed, the current may actually be sensed after a while. Accordingly, since the current below the threshold may be sensed at the time when the current is sensed, it may not be determined as a failure.

In other words, the current is sensed at the polling edge because the polling edge is the highest current. However, when a current is sensed at a time when the current is low due to a software pending while applying a sensing command due to a software processing delay, a current below a threshold may be sensed and thus may not be regarded as a failure.

Background art of the present invention is disclosed in Republic of Korea Patent Publication No. 10-2007-0072702 (2007.07.05).

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a battery short protection device capable of immediately turning off a PWM control signal when a current is sensed in hardware and a current higher than a threshold for fault detection is sensed. There is a purpose.

In addition, an object of the present invention is to provide a battery short protection device so that the second failure does not occur by sensing the current in hardware to prevent time delay until the PWM control signal is turned off after the failure is detected.

In addition, the present invention provides a battery short protection device that can use the ADC for other purposes by sensing the current in hardware without using the microcontroller ADC to turn off the PWM control signal immediately upon failure detection. have.

According to an aspect of the present invention, a battery short protection device may include: a battery short detection unit configured to detect a voltage between both ends of a shunt resistor connected to a source of a switching transistor, and output a battery short signal when the detected voltage is greater than or equal to a specific threshold value; And a PWM signal controller which turns off the PWM signal when the battery short signal is output from the battery short detector.

The battery short detector of the present invention is characterized by inverting the battery short signal and applying it to the PWM signal controller.

The battery short detection unit of the present invention includes a resistor for receiving a voltage between both ends of the shunt resistor to one side; A resistor connected in series with the resistor to divide the voltage between both ends of the shunt resistor; A transistor having the divided voltage applied to a base and an emitter grounded; A transistor connected to a collector of the transistor, receiving a driving power to an emitter, and outputting a battery short signal from the collector; And an inverter for inverting and outputting the battery short signal.

The PWM signal controller may include an AND gate outputting the inverted battery short signal and the PWM signal to the gate terminal of the switching transistor.

The battery short detector may output a high level signal when the voltage between both ends of the shunt resistor is greater than or equal to a threshold value, and invert the signal to output a low level signal to the PWM signal controller.

The present invention has the effect of being able to immediately turn off the PWM control signal without time delay when the current is sensed by hardware to sense the current more than the threshold for fault detection.

In addition, the present invention has the effect of preventing the secondary failure due to the time delay by sensing the current in hardware to turn off the PWM control signal immediately upon failure detection.

In addition, the present invention is able to sense the current in hardware without using the ADC of the microcontroller has the effect that the ADC can be used for other purposes.

1 is an exemplary view showing a schematic configuration of a PWM control device having a conventional battery short detection circuit.
2 is an exemplary view showing the configuration of a battery short protection device according to an embodiment of the present invention.
3 is an exemplary view showing a waveform of a signal output for each step of the battery short protection device according to an embodiment of the present invention.

This will be described in detail with reference to the accompanying drawings, a battery short protection device according to an embodiment of the present invention. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

2 is a circuit diagram of a battery short protection device according to an embodiment of the present invention.

As shown in FIG. 2. A power supply VCC and a load (e.g., motor, valve) 100 are connected in series with the drain of the switching transistor Q1, the source of the switching transistor is grounded through the shunt resistor SR1, and PWM at the gate of the switching transistor. In a PWM control device configured to apply a signal (or a PWM control signal), a battery short detector 201 which detects a voltage between both ends of a shunt resistor SR1 and outputs a battery short signal when the detected voltage is equal to or greater than a specific threshold value. Wow; When the battery short signal is output from the battery short detection unit 201 is configured to include a PWM signal control unit 202 to turn off the PWM signal.

Here, the voltage between both ends of the shunt resistor SR1 may be detected and amplified by the amplifier AMP1, and the noise may be removed from the amplified output voltage by the filter F1 to be applied to the battery short detector 201. Can be.

The battery short signal output from the battery short detector 201 may be a pulse of a level that can be directly applied to a specific port of a microcontroller (not shown). In addition, the battery short signal may be inverted and output as necessary.

The battery short detection unit 201 is connected in series with a resistor R1 receiving a voltage between both ends of the shunt resistor SR1 and a resistor R1 in series to divide the voltage between both ends of the shunt resistor SR1 and the divided voltage. The transistor is connected to the base, the emitter is grounded, the collector of transistor Q2 is connected to the base, and the driving power (for example, 5V) is applied to the emitter, and the collector outputs a battery short signal. And a transistor Q3 and an inverter INV1 for directly applying the battery short signal to a microcontroller (not shown) or inverting and outputting the battery short signal.

The PWM signal controller 202 includes an AND gate that performs an AND combination of the inverted battery short signal and a PWM signal output from a microcontroller (not shown), and outputs the result to the gate terminal of the switching transistor Q1. . The PWM signal controller 202 may be configured to use the inverted battery short signal as it is.

The battery short detector 201 outputs a high level signal when the voltage between both ends of the shunt resistor SR1 is equal to or greater than a threshold value. Accordingly, the microcontroller (not shown) receives a high level signal, and the battery short signal changed to the low level through the inverter INV1 is input to the PWM signal controller 202.

The PWM signal controller 202 turns off the PWM signal through an AND combination with the PWM signal when the low level battery short signal is input.

Hereinafter, the operation of the battery short protection device according to an embodiment of the present invention will be described in detail.

As shown in FIG. 2, as the current flowing through the shunt resistor SR1 increases due to battery short, the voltage between both ends of the shunt resistor SR1 also increases. Therefore, since the transistor Q2 is turned on when the voltage applied to the base is 0.7 V or more, when the voltage between the both ends of the shunt resistor SR1 becomes more than a certain threshold by adjusting the resistance value of the resistor R1 and the resistor R2. 0.7 V or more is applied to the base of the transistor Q2.

For example, using the voltage (for example, 0.7V) = input voltage (for example, voltage between both ends of the shunt resistor) * {R2 / (R1 + R2)} to the base of the transistor Q2, The resistor R2 can be tuned. That is, the desired failure detection threshold may be set by tuning the resistors R1 and R2.

Accordingly, when the input voltage (voltage between both ends of the shunt resistor) is equal to or greater than the threshold value, the transistor Q2 is turned on, and accordingly, the transistor Q3 is turned on to output a high level signal. However, when the input voltage (voltage between both ends of the shunt resistor) is less than or equal to the threshold, the transistor Q2 is turned off, and accordingly the transistor Q3 is turned off to output a low level signal.

3 is an exemplary view showing a waveform of a signal output for each step of the battery short protection device according to an embodiment of the present invention.

As shown in FIG. 3, when the voltage between the both ends of the shunt resistor SR1 becomes greater than or equal to the threshold due to the battery short, the battery short detector 201 outputs a high level signal and is low by using the inverter INV. The signal converted into a level is output to the PWM signal controller 202. As a result, when a current above the threshold flows, the low voltage battery short signal is applied to the PWM signal controller 202, thereby turning off the PWM signal. When a current less than the threshold flows, a high level signal is applied to the PWM controller 202, thereby turning on the PWM signal.

As described above, the present invention enables instantaneous fault detection at the moment when a current above the fault detection threshold flows, and checks the number of times a high level signal is input to a microcontroller (not shown) in order to reduce the fault detection. It can be applied to detect a fault only when a high level signal is input more than the number of times.

In addition, since the present invention does not need to perform an analog to digital convert (ADC), the software load is small, and an interrupt is not generated at the falling edge to detect current at the falling edge of the PWM signal. It also eliminates the need for current sensing and turns off the PWM signal immediately after a fault (ie, battery short), minimizing the stress on the shunt resistor to prevent secondary faults.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand. Accordingly, the technical scope of the present invention should be defined by the following claims.

201: battery short detection unit 202: PWM signal control unit
SR1: Shunt Resistor

Claims (5)

A battery short detector detecting a voltage between both ends of the shunt resistor connected to the source of the switching transistor and outputting a battery short signal when the detected voltage is equal to or greater than a specific threshold value; And
And a PWM signal controller to turn off the PWM signal when the battery short signal is output from the battery short detector. The method of claim 1, wherein the battery short detection unit
Inverting the battery short signal and applying to the PWM signal control unit, characterized in that the battery short protection device. The method of claim 1, wherein the battery short detection unit
A resistor receiving a voltage between both ends of the shunt resistor on one side;
A resistor connected in series with the resistor to divide the voltage between both ends of the shunt resistor;
A transistor having the divided voltage applied to a base and an emitter grounded;
A transistor connected to a collector of the transistor, receiving a driving power to an emitter, and outputting a battery short signal from the collector; And
And an inverter for inverting and outputting the battery short signal. The method of claim 1, wherein the PWM signal control unit
And an AND gate for combining and inverting the inverted battery short signal and the PWM signal to a gate terminal of the switching transistor. The method of claim 1, wherein the battery short detection unit
And outputting a high level signal when the voltage between both ends of the shunt resistor is equal to or greater than a threshold value, and inverting the signal to output a low level signal to the PWM signal controller.
KR1020110123854A 2011-11-24 2011-11-24 Battery short protection apparatus KR20130057884A (en)

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KR1020110123854A KR20130057884A (en) 2011-11-24 2011-11-24 Battery short protection apparatus

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Application Number Priority Date Filing Date Title
KR1020110123854A KR20130057884A (en) 2011-11-24 2011-11-24 Battery short protection apparatus

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190004948A (en) * 2017-07-05 2019-01-15 현대모비스 주식회사 Apparatus for controlling damper of continuous damping control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190004948A (en) * 2017-07-05 2019-01-15 현대모비스 주식회사 Apparatus for controlling damper of continuous damping control system

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