KR101744740B1 - Circuit for detecting error and controlling current - Google Patents

Circuit for detecting error and controlling current Download PDF

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Publication number
KR101744740B1
KR101744740B1 KR1020150173467A KR20150173467A KR101744740B1 KR 101744740 B1 KR101744740 B1 KR 101744740B1 KR 1020150173467 A KR1020150173467 A KR 1020150173467A KR 20150173467 A KR20150173467 A KR 20150173467A KR 101744740 B1 KR101744740 B1 KR 101744740B1
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KR
South Korea
Prior art keywords
filter
unit
current
solenoid valve
current control
Prior art date
Application number
KR1020150173467A
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Korean (ko)
Inventor
김억수
Original Assignee
현대오트론 주식회사
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Priority to KR1020150173467A priority Critical patent/KR101744740B1/en
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Publication of KR101744740B1 publication Critical patent/KR101744740B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
    • G01R23/16—Spectrum analysis; Fourier analysis
    • G01R23/165—Spectrum analysis; Fourier analysis using filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/327—Testing of circuit interrupters, switches or circuit-breakers

Abstract

The present invention relates to a fault detection and current control circuit, and more particularly, to a fault detection and current control circuit which includes a power supply for supplying a signal to a circuit, a filter for passing a signal supplied by the power supply, A current control unit for determining whether to perform low-speed control, and a failure detection unit for receiving a signal passed through the filter unit and detecting a synchronization error through the current control unit.
According to the present invention, there is no need for a separate signal processing process for current value averaging, so that the control of solenoid valves and configurations to be subjected to PWM on / off current control is not delayed, And there is no case in which the value of the current that changes when the duty varies is delayed by a predetermined time through the hardware filter, so that the overshoot or undershoot of the current does not occur. Further, there is an effect that failure detection can be performed without a separate device for detecting a failure of a circuit.

Description

[0001] CIRCUIT FOR DETECTING ERROR AND CONTROLLING CURRENT [0002]

The present invention relates to a fault detection and current control circuit, and more particularly, to a fault detection and current control circuit capable of detecting a synchronization error while determining high-speed control or low-speed control of current using two or more filter units .

Conventional PWM (Pulse With Modulation) on / off current control has only one hardware filter as shown by a dotted line in FIG. 1, receives it as an input to an ADC (Analog Digital Converter) ). Therefore, a separate signal processing process for averaging the current value due to the fluctuation of the on / off current is required. If the sampling cycle time of the ADC is not overwhelmingly shorter than the cycle of the PWM on / off current control , There is a problem that an error occurs in the measured value of the current. In order to solve this problem, when the degree of filtering of the hardware is increased, the value of the current that changes when the duty of the PWM on / off current control is changed is input through the hardware filter for a predetermined time delay. As a result, There is a problem that current control is not easy because an overshoot or an undershoot occurs in the transistor.

  On the other hand, when the PWM on / off current control is used in a vehicle, control over solenoid valves and configurations subject to PWM on / off current control is delayed due to the time required for a separate signal processing process for averaging current values There is a problem that the circuit may be damaged due to overshoot or undershoot of the current control, which can lead to an accident. Therefore, a new current control circuit is needed to solve this problem.

Korean Patent Publication No. 10-2014-0140509 (Dec. 19, 2014)

An object of the present invention is to provide a fault detection and current control circuit that does not require a separate signal processing process for current value averaging in PWM on / off current control.

In addition, there is no possibility that the value of the current that changes when the duty of the PWM on / off current control varies is delayed by a predetermined time through the hardware filter. As a result, the fault detection and the overshoot And an object thereof is to provide a current control circuit.

It is also an object of the present invention to provide a fault detection and current control circuit capable of detecting a failure of a circuit at the same time.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

A fault detection and current control circuit according to an embodiment of the present invention includes a power supply unit for supplying a signal to a circuit, a filter unit for passing a signal supplied from the power supply unit, And a fault detector for detecting a synchronization error through a signal supplied through the filter unit. According to the present invention, there is no need for a separate signal processing process for current value averaging, so that the control of solenoid valves and configurations to be subjected to PWM on / off current control is not delayed, And there is no case in which the value of the current that changes when the duty varies is delayed by a predetermined time through the hardware filter, so that the overshoot or undershoot of the current does not occur. Further, there is an effect that failure detection can be performed without a separate device for detecting a failure of a circuit.

The signal processing unit may further include a signal conversion unit provided between an output terminal of the filter unit and an input terminal of the fault detection unit and the current control unit. The current control unit, the failure detection unit, and the signal conversion unit may be included in a central processing unit (CPU).

In addition, the current controller may perform feed-back control to the solenoid valve by determining whether the current is low-speed control or high-speed control, and the filter unit may include a first filter (High Pass Filter) And a second filter that is a low pass filter.

If the voltage applied to the rear end of the first filter is V1 and the current control unit performs the feedback control on the solenoid valve in the transient period of the signal supplied by the power supply unit, And the voltage applied to the rear end of the second filter is V2, when the current control unit performs the feedback control on the solenoid valve in the steady section of the signal supplied by the power supply unit, have.

The failure detecting unit may detect a synchronization error when a signal that has passed through the first filter and the second filter does not satisfy a predetermined relationship, V2 min < V2 max < V1 max in the steady section of the signal supplied by the power supply unit when the voltage applied to the rear end of the second filter is V2.

According to the present invention, there is no need for a separate signal processing process for current value averaging, so that the control of solenoid valves and configurations to be subjected to PWM on / off current control is not delayed, Can be effective.

In addition, there is no effect that the value of the current which changes when the duty is varied is delayed by a predetermined time through the hardware filter, so that the overshoot or undershoot of the current does not occur.

Further, there is an effect that failure detection can be performed without a separate device for detecting a failure of a circuit.

The effects of the present invention are not limited to the above-mentioned effects, and various effects can be included within the range that is obvious to a person skilled in the art from the following description.

1 is a diagram showing a hardware filter included in a conventional PWM on / off current control circuit.
2 is a diagram showing a fault detection and current control circuit according to an embodiment of the present invention.
3 is a diagram illustrating a first filter and a second filter included in the fault detection and current control circuit according to an embodiment of the present invention.
4 is a view showing a state of V0 according to the steady and transient sections of the current.
5 is a view showing states of V1 and V2 according to the steady and transient periods of the current.
6 is a diagram showing a state where a signal conversion unit is installed in a fault detection and current control circuit according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. The embodiments described above are provided so that those skilled in the art can easily understand the technical spirit of the present invention and thus the present invention is not limited thereto and a detailed description of the related known structure or function may be considered to blur the gist of the present invention Detailed description thereof will be omitted.

In the drawings, the same or similar elements are denoted by the same reference numerals, and the same reference numerals are used throughout the drawings to refer to the same or like elements. It should be noted that the elements have the same reference numerals as much as possible even if they are displayed on different drawings.

In addition, the expression &quot; comprising &quot; is intended to merely denote that such elements exist as an 'open expression', and should not be understood as excluding additional elements.

2 is a diagram showing a fault detection and current control circuit 100 according to an embodiment of the present invention.

The fault detection and current control circuit 100 includes a power supply section 10, a filter section 20, a current control section 30, and a fault detection section 40. However, it is to be understood that the present invention is not limited thereto and that some configurations may be added or deleted as needed. Also, in the case of the configurations having the same or similar roles to those of the above-described configurations, the same configurations as those of the above configurations should be considered regardless of their names.

The power supply unit 10 is configured to supply power to the fault detection and current control circuit 100 according to an embodiment of the present invention, and any power supply unit provided in the vehicle can be used as the power supply unit 10. [ For example, a power source dedicated to the fault detection and current control circuit 100 may be provided, or a battery installed in the vehicle may be used. The power supply unit 10 can supply a current, which is a power supply signal, to the failure detection and current control circuit 100.

In the filter unit 20, a signal supplied from the power supply unit 10 is passed. Specifically, the current, which is a power supply signal supplied by the power supply unit 10, passes through the shunt 13 and passes through the filter unit 20 in a state amplified by the amplifier 15. The first and second filters 21 and 22 may include a first filter 21 and a second filter 22 as shown by the dotted line in FIG. Filter. The first filter 21 may be a high pass filter (HPF) and the second filter 22 may be a low pass filter (LPF).

On the other hand, as current passes through the filter unit 20, voltage is applied to the front and rear ends of the filter unit 20. 3, the voltage applied to the front end of the first filter 21 and the second filter 22 is V0, the voltage applied to the rear end of the first filter 21 is V1, The voltage applied to the rear end of the solenoid valve 22 is V2 and is input to the current control unit 30 and the failure detection unit 40 to be described later and used to detect a control and synchronization error of a solenoid valve (not shown).

As described above, it is the biggest difference from the prior art that the filter unit 20 includes the first filter 21 and the second filter 22, which will be described in detail in the following current control unit 40 .

The current control unit 30 is supplied with a signal that has passed through the filter unit 20, and determines whether the current is controlled at a high speed or at a low speed. Specifically, a high-speed current control or a low-speed control is performed to perform feed-back control on a solenoid valve (not shown). Here, the feedback control for the solenoid valve (not shown) controls the position of the solenoid valve (not shown) (not shown), and a magnetic field proportional to the current flowing through the coil is formed, (Not shown) is carried out in response to the force of pulling the needle (not shown).

The position control of a needle (not shown) of a solenoid valve (not shown) performed by the current control unit 30 is controlled by controlling a duration of a current, which is a power supply signal supplied by the power supply unit 10, Which is a voltage applied to the front end of the second filter 22, is separately performed. The current that is a power supply signal supplied by the power supply unit 10 can be divided into a steady section and a transient section and is divided into a first section and a second section, V0, which is the voltage applied, also looks different. Referring to FIG. 4, it can be seen that V0 according to the steady and transient sections of the current is oscillated periodically within a certain range in the steady section, while the average value is constant in the steady section, while the average value is not constant in the transient section It shows a fluctuating appearance. Therefore, when the solenoid valve (not shown) is individually controlled according to the interval, the accuracy of the control can be increased. In the case of the steady section, V0 periodically oscillates within a certain range. Specifically, it is necessary to perform low-speed control of the current showing a characteristic in which averaging is large. On the other hand, in the case of the transient section, since the average value of V0 is not constant and fluctuates, high-speed control of current exhibiting high responsiveness, more specifically, characteristic of low delay time is required.

In the description of the filter unit 20, it has been described that the first filter 21 may be a high-pass filter and the second filter 22 may be a low-pass filter. Referring to FIG. 5, V1 and V2 can be observed according to the steady and transient sections. As described above, low-speed control of the current indicating a large averaging characteristic is required in the steady section, and a solenoid valve (not shown) is operated by using a voltage V2 that is passed through the second filter 22, ) In the case of the first embodiment. Meanwhile, in the transient section, it is necessary to control the current with a small delay time. In this case, a solenoid valve (not shown) is used by using a voltage V1 which is passed through the first filter 21, It is preferable to perform the control of FIG. The individual control of the solenoid valve (not shown) can be performed according to the high-speed control or the low-speed control according to the characteristic of the signal that can pass through each filter. The filter is divided according to the section of the signal, The voltage is used for individual control for the solenoid valve (not shown), no separate signal processing is required for the current averaging, and the solenoid valve (not shown) and the components to be subjected to PWM on / off current control It is possible to obtain an effect of reducing the control error as well as the delay of the control of the vehicle. In addition, there is no possibility that the value of the current which changes when the duty is varied is delayed by a predetermined time through the hardware filter, so that no overshoot or undershoot of the current can be obtained.

The failure detection unit 40 receives a signal that has passed through the filter unit 20, and detects a synchronization error through the signal. Concretely, when V1 and V2, which are the signals passing through the first filter 21 and the second filter 22, and which are applied to the rear end, do not satisfy the predetermined relation, it can be detected as a synchronization error, V0 is a voltage that is applied to the front end of the filter 21 and the second filter 22 and V0 is a current that is a power supply signal supplied by the power supply unit 10. Therefore, 10) is the same as the section of the current which is the power supply signal supplied by the above-described embodiment.

First, the predetermined relationship in the steady section uses the maximum value and the minimum value of V1 and V2. Concretely, V1min <V2min <V2max <V1max (where min is the minimum value and max is the maximum value) . Therefore, if the maximum value and the minimum value of V1 and the maximum value and the minimum value of V2 do not satisfy the above-described relation, it can be determined that a synchronization error has occurred. Meanwhile, the predetermined relationship in the transient section is different from that in the steady section, and a synchronization error is detected depending on whether a constant voltage difference occurs due to a difference in the RC time constant. In this case, since the modeling value according to the characteristics of the load should be used, the constant voltage difference may vary depending on the load, but it can not exhibit a typical relationship like the steady section, but the designer can freely set it according to the modeling value will be. For example, a voltage difference that is commonly known in the pertinent art may be set as a reference for synchronization fault detection, and a voltage when the current limit of the fault detection and current control circuit 100 is exceeded is calculated, May be set as a criterion for error detection.

The signal converting unit 25 may be provided between the output terminal of the filter unit 20 and the input terminal of the current control unit 30 and the failure detecting unit 40. Here, the signal converting unit 25 may use an ADC (Analog Digital Converter), and the signal converting unit 25 inputs the analog signal passed through the filter unit 20 to the current controlling unit 30 and the failure detecting unit 40 However, the filter unit 20 of the fault detection and current control circuit 100 according to the embodiment of the present invention is not limited to the one shown in FIG. 1 filter 21 and the second filter 22, it is preferable that the signal converting unit 25 is also installed separately. 6, a first signal converter 26 is provided at the output end of the first filter 21 and a second signal converter 27 is connected at the output end of the second filter 22, Can be installed. The failure detection and current control circuit 100 may also be configured by including both the current control unit 30, the failure detection unit 40 and the signal conversion unit 25 in the central processing unit 50. In this case, It is possible to simplify the configuration of the second embodiment.

The embodiments of the present invention described above are disclosed for the purpose of illustration, and the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

100: Fault detection and current control circuit
10:
13: Shunt 15: Amplifier
20:
26: first signal converting section 27: second signal converting section
30:
40:
50: central processing unit

Claims (9)

A power supply for supplying a signal to the circuit;
A filter unit through which a signal supplied by the power supply unit passes;
A current controller for supplying a signal having passed through the filter unit and determining whether the current is controlled at a high speed or at a low speed; And
A failure detector for detecting a synchronization error through a signal passed through the filter unit;
Lt; / RTI &gt;
The current control unit determines whether to perform low-speed control or high-speed control of the current, performs feed-back control on the solenoid valve,
The filter unit includes:
A first filter which is a high pass filter; And
A second filter that is a low pass filter;
Lt; / RTI &gt;
A failure detection and current control circuit of the solenoid valve for controlling the solenoid valve using the voltage applied to the first filter when the current control unit performs feedback control on the solenoid valve in a transient period of the signal supplied from the power supply unit;
The method according to claim 1,
A signal conversion unit provided between an output terminal of the filter unit and an input terminal of the fault detection unit and the current control unit;
The solenoid valve according to claim 1, further comprising a solenoid valve
3. The method of claim 2,
The current control unit, the failure detection unit,
Characterized in that the solenoid valve is included in a central processing unit (CPU)
delete delete delete The method according to claim 1,
And a voltage applied to the rear end of the second filter is V2,
Wherein when the current control unit performs the feedback control on the solenoid valve in the steady period of the signal supplied by the power supply unit, the control is performed using the V2.
The method according to claim 1,
Wherein the failure detection unit comprises:
And detects a synchronization error when the signal passed through the first filter and the second filter does not satisfy a predetermined relation.
9. The method of claim 8,
The predetermined relationship may include:
V1 min < V2 max < V1 max in the steady section of the signal supplied by the power supply unit, when the voltage applied to the rear end of the first filter is V1 and the voltage applied to the rear end of the second filter is V2 Wherein the solenoid valve is connected to the solenoid valve.
KR1020150173467A 2015-12-07 2015-12-07 Circuit for detecting error and controlling current KR101744740B1 (en)

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KR1020150173467A KR101744740B1 (en) 2015-12-07 2015-12-07 Circuit for detecting error and controlling current

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023164420A1 (en) * 2022-02-24 2023-08-31 Psemi Corporation Power converter with integrated multi-phase reconfigurable current balancing
CN117310444A (en) * 2023-09-26 2023-12-29 广州向成电子科技有限公司 Fault state corresponding relation table manufacturing method, LC passive filter circuit fault detection method, detection equipment and storage medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023164420A1 (en) * 2022-02-24 2023-08-31 Psemi Corporation Power converter with integrated multi-phase reconfigurable current balancing
CN117310444A (en) * 2023-09-26 2023-12-29 广州向成电子科技有限公司 Fault state corresponding relation table manufacturing method, LC passive filter circuit fault detection method, detection equipment and storage medium
CN117310444B (en) * 2023-09-26 2024-05-07 广州向成电子科技有限公司 Fault state corresponding relation table manufacturing method, LC passive filter circuit fault detection method, detection equipment and storage medium

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