KR20140005392A - High voltage power supply having current error compensating means and current error compensating method using the power supply - Google Patents

High voltage power supply having current error compensating means and current error compensating method using the power supply Download PDF

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Publication number
KR20140005392A
KR20140005392A KR1020120068613A KR20120068613A KR20140005392A KR 20140005392 A KR20140005392 A KR 20140005392A KR 1020120068613 A KR1020120068613 A KR 1020120068613A KR 20120068613 A KR20120068613 A KR 20120068613A KR 20140005392 A KR20140005392 A KR 20140005392A
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South Korea
Prior art keywords
current
current deviation
circuit unit
value
power supply
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KR1020120068613A
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Korean (ko)
Inventor
류동균
김상대
김계현
홍성수
김영신
이기은
홍천기
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삼성전기주식회사
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Priority to KR1020120068613A priority Critical patent/KR20140005392A/en
Publication of KR20140005392A publication Critical patent/KR20140005392A/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/618—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series and in parallel with the load as final control devices

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The present invention relates to a power supply having a current deviation correction means and a current deviation correction method using the same.
Power supply having a current deviation correction means according to the present invention, the current sensing circuit for detecting and feeding back the output current; A sensing value output circuit unit outputting a high or low signal according to the current value sensed by the current sensing circuit unit; A current deviation calculator which receives a current sensed by the current sensing circuit unit and calculates a current deviation by comparing with a reference value; And a current deviation correction circuit unit that corrects the current deviation calculated by the current deviation calculator.
According to the present invention, the output voltage is adjusted by correcting the deviation of the output current by a separate current deviation correction circuit, so that the voltage supplied to the circuit can be stabilized, and the customer's request (output current value according to the load) can be adjusted. Can satisfy.

Figure P1020120068613

Description

High voltage power supply having current error compensating means and current error compensating method using the power supply}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage power supply (HVPS) employed in computer peripherals (eg printers). The present invention relates to a power supply device having a current deviation correction means capable of solving a problem of not satisfying a specification required by a customer, and a current deviation correction method using the same.

Today, due to the remarkable developments in information and communication technology, the development of various multimedia devices including computers is also rapidly progressing. In particular, with the rapid increase in the demand for computers, the demand for printers as computer peripherals is also increasing. In addition, the research and development of the printer as well as the research and development of the computer is constantly being made.

On the other hand, in the above printers, there is a problem that the output current value deviates from the customer specification because a deviation occurs in the current sensed by the current sensing circuit due to the difference in the feedback circuit method for each printer manufacturer. have.

In addition, as the configuration of the output stage is designed differently for each printer set company, problems that occur in each company are different, and accordingly, a circuit improvement is required to meet new customer specifications.

Korean Laid-Open Patent Publication No. 10-2004-0098208 Korean Laid-Open Patent Publication No. 10-2007-0077607

The present invention has been made to solve the above problems, and due to the difference in the feedback circuit method of controlling the voltage supplied to the circuit by feeding back the output current, the variation in the current sensed by the current sensing circuit is varied. It is an object of the present invention to provide a power supply having a current deviation correction means and a method for correcting the current deviation using the same, which can solve the problem of deviation from the specification required by the customer.

In order to achieve the above object, a power supply having a current deviation correction means according to the present invention,

A current sensing circuit unit for sensing and feeding back an output terminal current;

A sensing value output circuit unit outputting a high or low signal in accordance with the current value sensed by the current sensing circuit unit;

A current deviation calculator which receives a current sensed by the current sensing circuit unit and calculates a current deviation by comparing with a reference value; And

It is characterized in that it comprises a current deviation correction circuit section for correcting the current deviation calculated by the current deviation calculator.

Here, the current deviation correction circuit unit may be composed of a series-parallel combination circuit of a plurality of resistors and capacitors and a semiconductor switching element.

In this case, a bipolar transistor may be used as the semiconductor switching device.

In addition, the current deviation correction circuit unit corrects a current deviation generated for each load by changing a reference current value by using a pulse width modulation signal.

In addition, the current deviation correction method using the power supply according to the present invention in order to achieve the above object,

A current deviation correction method using a power supply including a current sensing circuit portion, a sensed value output circuit portion, a current deviation calculator, and a current deviation correction circuit portion,

a) sensing and feeding back an output terminal current by the current sensing circuit unit;

b) outputting a high or low signal by the sensed value output circuit portion in accordance with the current value sensed by the current sense circuit portion;

c) calculating a current deviation by receiving the current sensed by the current sensing circuit unit by the current deviation calculator and comparing it with a reference value; And

d) correcting the current deviation calculated by the current deviation calculator by the current deviation correction circuit.

Here, in step d), the current deviation correction circuit corrects the current deviation generated for each load by changing a reference current value using a pulse width modulation signal.

According to the present invention, the output voltage is adjusted by correcting the deviation of the output current by a separate current deviation correction circuit, so that the voltage supplied to the circuit can be stabilized, and the customer's request (output current value according to the load) can be adjusted. Can satisfy.

1 is a view showing an example of an output stage current feedback circuit in a conventional power supply.
2 is a view showing a circuit configuration of a power supply having a current deviation correction means according to an embodiment of the present invention.
Figure 3 is a flow chart showing the execution process of the current deviation correction method using a power supply having a current deviation correction means according to an embodiment of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor can properly define the concept of the term to describe its invention in the best way Should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module, "and" device " Lt; / RTI >

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Here, before describing the embodiment of the present invention in earnest, the output stage current feedback circuit in the conventional power supply will be described first to help the understanding of the present invention.

1 is a view showing an example of an output stage current feedback circuit in a conventional power supply.

As shown in Fig. 1, the output stage current feedback circuit in the conventional power supply is composed of a circuit structure that receives direct feedback from the secondary side.

Therefore, the deviation occurred as much as the current flowing through the feedback resistor to obtain a test result as shown in Table 1 for each load, which has a problem that deviates from the customer specifications (spec.) Standards.

Test results LOAD CURRENT (㎂) 10 MΩ 10.75 20㏁ 10.13 30㏁ 9.67 40㏁ 9.25 50㏁ 8.88 60㏁ 8.53 70㏁ 8.22 80 ㏁ 7.93 90㏁ 7.66 100 ㏁ 7.40 150㏁ 6.32 200㏁ 5.53 250 ㏁ 4.91 300 yen 4.40 350 yen 4.00

* Customer specification

-Load condition: 10MΩ ~ 335MΩ

-CURRENT SENSING point: 8㎂ ± 10%

* Measurement result

Currently, according to the test result of Table 1, the specification is satisfied only in 60MΩ ~ 100MΩ, and it is out of specification in the rest of the section.

The present invention is derived to improve the problems in the output stage current feedback circuit of the conventional power supply as described above, due to the difference in the feedback circuit method for controlling the voltage supplied to the circuit by feeding the output stage current (current sensing ( The present invention aims to provide a power supply having a current deviation correction means that can solve the problem of deviation from the current sensed by the current sensing circuit, thereby deviating from the specification required by the customer.

In addition, the present invention is to provide a current deviation correction method using such a power supply.

2 is a circuit diagram illustrating a power supply apparatus according to an embodiment of the present invention.

Referring to FIG. 2, the power supply device according to the present invention includes a current sensing circuit 210, a sensed value output circuit 220, a current deviation calculator 230, and a current deviation correction circuit 240.

The current sensing circuit 210 senses an output terminal current and feeds it back to the current deviation calculator 230 and the sensed value output circuit 220. As shown in the drawing, the current sensing circuit unit 210 may include a plurality of resistors and capacitors and a series-parallel combination circuit of a diode.

The sensing value output circuit unit 220 outputs a high or low signal according to the current value sensed by the current sensing circuit unit 210. For example, the sensing value output circuit unit 220 compares the current value sensed by the current sensing circuit unit 210 with the reference current value and outputs a low signal when the sensing current value is smaller than the reference current value. If the value is greater than the reference current value, a high signal is output. This will be explained later.

The current deviation calculator 230 receives a current sensed by the current sensing circuit 210 to calculate a current deviation by comparing with a reference value. An integrated circuit IC may be used as the current deviation calculator 230.

The current deviation correction circuit 240 corrects the current deviation calculated by the current deviation calculator 230. Here, the current deviation correction circuit unit 240, as shown, may be composed of a series-parallel combination circuit of a plurality of resistors and capacitors and a semiconductor switching element.

In this case, a bipolar transistor may be used as the semiconductor switching device.

In addition, the current deviation correction circuit unit 240 corrects a current deviation generated for each load by changing a reference current value using a pulse width modulation signal.

Then, a description will be given of a current deviation correction method using a power supply having a current deviation correction means according to the present invention having the configuration as described above.

3 is a flowchart illustrating an execution process of a current deviation correction method using a power supply having a current deviation correction means according to an embodiment of the present invention.

Referring to FIG. 3, the current deviation correction method using the power supply device according to the present invention includes the current sensing circuit 210, the sensed value output circuit 220, the current deviation calculator 230, and the current deviation correction as described above. A method of correcting a current deviation using a power supply device including a circuit unit 240. First, an output terminal current is sensed by the current sensing circuit unit 210, thereby detecting the current deviation calculator 230 and a sensed value output circuit unit 220. (Step S301).

Then, the sensing value output circuit unit 220 outputs a high or low signal according to the current value sensed by the current sensing circuit unit 210. That is, the sensed value output circuit unit 220 receives the current value sensed by the current sense circuit unit 210 to receive a reference current value, for example, the current value of the current sensing point in the aforementioned customer specification (eg, 8 ㎂) (step S302), a low signal is output when the sense current value is equal to or less than the reference current value 8 ((step S303). When the sensed current value exceeds the reference current value (8 mA) as a result of the comparison, a high signal is output (step S304).

On the other hand, the current deviation calculator 230 receives the current sensed by the current sensing circuit 210 to calculate a current deviation by comparing with a reference value (step S305).

Then, the current deviation correction circuit 240 corrects the current deviation calculated by the current deviation calculator 230 (step S306).

Here, the current deviation correction circuit unit 240 corrects a current deviation generated for each load by changing a reference current value using a pulse width modulation signal.

[Table 2] shows the results of measuring the current of the output stage for each load after correcting the current deviation by the current deviation correction method of the present invention as described above.

Measurement result LOAD CURRENT (㎂) 10 MΩ 8.25 20㏁ 8.20 30㏁ 8.10 40㏁ 8.04 50㏁ 7.92 60㏁ 7.87 70㏁ 7.85 80 ㏁ 7.78 90㏁ 7.75 100 ㏁ 7.73 150㏁ 7.62 200㏁ 7.59 250 ㏁ 7.67 300 yen 7.91 350 yen 8.58

As can be seen from the above measurement results, it can be seen that the above-described customer specification is satisfied at all loads of 10MΩ to 350MΩ.

As described above, the power supply device according to the present invention adjusts the output voltage by correcting the deviation of the output current by a separate current deviation correction circuit, it is possible to stabilize the voltage supplied to the circuit, Output current according to load) can be satisfied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Accordingly, the true scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the same should be construed as being included in the scope of the present invention.

210. Current sensing circuit
220.detection output circuit
230 ... current deviation calculator
240 ... current deviation correction circuit

Claims (6)

A current sensing circuit unit for sensing and feeding back an output terminal current;
A sensing value output circuit unit outputting a high or low signal in accordance with the current value sensed by the current sensing circuit unit;
A current deviation calculator which receives a current sensed by the current sensing circuit unit and calculates a current deviation by comparing with a reference value; And
And a current deviation correcting means including a current deviation correcting circuit part for correcting the current deviation calculated by the current deviation calculating part.
The method of claim 1,
And the current deviation correcting circuit portion comprises a series and parallel combination circuit of a plurality of resistors and capacitors and a semiconductor switching element.
3. The method of claim 2,
And a bipolar transistor as said semiconductor switching element.
The method of claim 1,
And the current deviation correction circuit unit corrects a current deviation generated for each load by changing a reference current value using a pulse width modulation signal.
A current deviation correction method using a power supply including a current sensing circuit portion, a sensed value output circuit portion, a current deviation calculator, and a current deviation correction circuit portion,
a) sensing and feeding back an output terminal current by the current sensing circuit unit;
b) outputting a high or low signal by the sensed value output circuit portion in accordance with the current value sensed by the current sense circuit portion;
c) calculating a current deviation by receiving the current sensed by the current sensing circuit unit by the current deviation calculator and comparing it with a reference value; And
and d) correcting the current deviation calculated by the current deviation calculating unit by the current deviation correcting circuit unit.
The method of claim 5,
In step d), the current deviation correction circuit unit corrects a current deviation generated for each load by changing a reference current value by using a pulse width modulation signal, and the power supply having current deviation correction means. Current deviation correction method using a device.
KR1020120068613A 2012-06-26 2012-06-26 High voltage power supply having current error compensating means and current error compensating method using the power supply KR20140005392A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101529146B1 (en) * 2014-05-13 2015-06-16 엘에스산전 주식회사 Method for compensating of potential transformer
KR20150130149A (en) * 2014-05-13 2015-11-23 엘에스산전 주식회사 Method for compensating of potential transformer
KR20150130147A (en) * 2014-05-13 2015-11-23 엘에스산전 주식회사 High voltage direct current system
US9866137B2 (en) 2014-05-13 2018-01-09 Lsis Co., Ltd. Deviation compensation method of potential transformer

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101529146B1 (en) * 2014-05-13 2015-06-16 엘에스산전 주식회사 Method for compensating of potential transformer
KR20150130149A (en) * 2014-05-13 2015-11-23 엘에스산전 주식회사 Method for compensating of potential transformer
KR20150130147A (en) * 2014-05-13 2015-11-23 엘에스산전 주식회사 High voltage direct current system
US9654018B2 (en) 2014-05-13 2017-05-16 Lsis Co., Ltd. Deviation compensation method of potential transformer
US9853558B2 (en) 2014-05-13 2017-12-26 Lsis Co., Ltd. High voltage direct current (HVDC) transmission system to compensate for voltage values output from a plurality of potential transformers
US9866137B2 (en) 2014-05-13 2018-01-09 Lsis Co., Ltd. Deviation compensation method of potential transformer

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