KR20160146018A - Power supply device comprising high-voltage startup circuits - Google Patents

Power supply device comprising high-voltage startup circuits Download PDF

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Publication number
KR20160146018A
KR20160146018A KR1020150082519A KR20150082519A KR20160146018A KR 20160146018 A KR20160146018 A KR 20160146018A KR 1020150082519 A KR1020150082519 A KR 1020150082519A KR 20150082519 A KR20150082519 A KR 20150082519A KR 20160146018 A KR20160146018 A KR 20160146018A
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KR
South Korea
Prior art keywords
nmos transistor
switching unit
voltage
circuit
power supply
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Application number
KR1020150082519A
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Korean (ko)
Inventor
이경호
김기현
김형우
서길수
Original Assignee
한국전기연구원
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Application filed by 한국전기연구원 filed Critical 한국전기연구원
Priority to KR1020150082519A priority Critical patent/KR20160146018A/en
Publication of KR20160146018A publication Critical patent/KR20160146018A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/305—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M3/315—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
    • H02M2001/0048—
    • Y02B70/16—

Abstract

The present invention relates to a power supply device including a high-voltage startup circuit. The power supply device including a high-voltage startup circuit includes: a first switching unit comprising a first NMOS transistor applied with an input voltage and a first resistance; a second switching unit comprising a second NMOS transistor and a second resistance; a third switching unit comprising a third NMOS transistor and controlling on/off operations of the first NMOS transistor and the second NMOS transistor; a capacitor; and a startup control unit comparing a voltage charged in the capacitor and a preset first critical value and outputting a control signal which turns on or off the third switching unit, thereby reducing unnecessary power consumption caused by the startup circuit.

Description

[0001] POWER SUPPLY DEVICE COMPRISING HIGH-VOLTAGE STARTUP CIRCUITS [0002]

The present invention relates to a power supply apparatus including a high-voltage start-up circuit, and more particularly, to a power supply apparatus including a high-voltage start-up circuit capable of reducing unnecessary power consumption during initial startup of a power supply apparatus.

Generally, in order to ensure stable operation characteristics of the system circuit with respect to changes in external design environment (for example, power source, temperature, process parameters, etc.), a constant bias power source, that is, a band gap reference A voltage generator (Band-Gap Reference Voltage Generator) is used as a bias power supply device.

In addition, various types of bandgap reference bias generation circuits are used depending on the requirements and limitations of the system. This Self Bias reference voltage circuit has two operating points, one of which is the operating point when the current is 0A. When the current is operated at 0 A, the reference voltage circuit is likely to cause an unexpected malfunction that causes the reference bias voltage / current to fall into a zero state even when the supply voltage is not a zero but a normal operation.

Therefore, a start-up circuit is used to prevent the metastable state of this reference voltage circuit. The start-up circuit only assists the original intended initial operation of the reference voltage circuit and should not affect the reference voltage circuit if the reference voltage circuit reaches a normal operating state.

1 is a circuit diagram of a power converter including a conventional start-up circuit. 1, in the conventional power converter, the switch Q1 is turned on as the input high voltage is applied to the resistor R1 to increase the gate voltage V GS of the switch Q1 , The control IC operates when the current passing through the switch Q1 charges the capacitor C1 and the voltage charged in the capacitor C1 is equal to or greater than a preset value. Thereafter, power is supplied from the auxiliary winding through the diode D2.

However, in the conventional case, the current continues to flow through the resistor R1 in the start-up circuit even after the role of the start-up circuit that supplies power to the control IC until power is supplied is completed, and unnecessary power consumption There is a problem that it occurs.

KR 10-2005-0112622 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a power supply device including a high-voltage start-up circuit which is turned on only at the time of initial startup and is turned off when the power supply device is operated and the Vcc voltage is supplied to thereby reduce unnecessary power consumption The purpose is to provide.

A power supply device including a high-voltage start-up circuit according to an embodiment of the present invention includes a first NMOS transistor receiving an input power to a drain and a first resistor connected to a drain-gate terminal of the first NMOS transistor A first switching unit; A second NMOS transistor having a drain connected to the source of the first NMOS transistor and a gate connected to a gate of the first NMOS transistor, and a second NMOS transistor having one end connected to a gate of the first NMOS transistor and a gate of the second NMOS transistor A second switch connected to the first node and having a second end coupled to a source of the first NMOS transistor and a second node to which a drain of the second NMOS transistor is connected; A third switching unit configured to include a third NMOS transistor having a drain connected to the first node and a source connected to ground, the third switching unit controlling ON / OFF operations of the first NMOS transistor and the second NMOS transistor; A capacitor having one end connected to the source terminal of the second switching unit and the other end grounded; And a start-up control unit for comparing the voltage charged in the capacitor with a predetermined first threshold value to output a control signal for turning on or off the third switching unit.

According to the present invention, the start-up circuit is turned on at the initial startup of the power supply device to charge the input power supply, and is turned off when the charged power supply is equal to or greater than a predetermined first threshold value, It is possible to reduce unnecessary power consumption due to the circuit.

Further, according to the present invention, when the Vcc voltage supplied to the power supply unit falls below a second threshold value that is smaller than the first threshold value, the effect that the Vcc voltage can be kept constant by controlling the start- have.

1 is a circuit diagram of a power converter including a conventional start-up circuit,
2 is a circuit diagram showing a power supply device including a high-voltage start-up circuit according to an embodiment of the present invention,
3 is a circuit diagram showing a power supply apparatus including a high-voltage start-up circuit according to another embodiment of the present invention,
4 is a diagram for explaining the operation waveform of the high-voltage start-up circuit according to the embodiments of the present invention.

The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. Like reference numerals refer to like elements throughout the specification.

2 is a circuit diagram showing a power supply including a high-voltage start-up circuit according to an embodiment of the present invention;

2, a power supply apparatus including a high-voltage start-up circuit according to an embodiment of the present invention includes a start-up circuit 100, a power conversion unit 200, a power switching device 300, and a switching control unit 400 ).

First, the start-up circuit 100 receives input power HV_IN from an input terminal and outputs a charged power. If the charged power is greater than or equal to a predetermined first threshold value, the start-up circuit 100 cuts off the supply of the input power HV_IN .

The start-up circuit 100 may include a first switching unit 110, a second switching unit 120, a third switching unit 130, a capacitor 140, and a start-up control unit 150 .

Hereinafter, each configuration of the start-up circuit 100 will be described in detail.

First, the first switching unit 110 includes a first NMOS transistor receiving applying the input power to the drain (M 1) and said first NMOS transistor the drain of the (M 1), - a first resistor connected to the gate terminal (R 1 ).

Next, the first two NMOS transistors which are the second switching unit 120 has a drain connected to the gate of the first 1 NMOS transistor coupled to the source of the (M 1) and the gate is the first 1 NMOS transistor (M 1) (M 2 And one end of which is connected to the first node A to which the gate of the first NMOS transistor M 1 and the gate of the second NMOS transistor M 2 are connected and the other end of which is connected to the first NMOS transistor M 1 And a second resistor R 2 connected to a second node B to which a drain of the second NMOS transistor M 2 is connected.

The capacitor 140 is connected at one end to the source terminal of the second switching unit 120 and at the other end to the ground so that the capacitor 140 passes through the first switching unit 110 and the second switching unit 120 Charge the voltage.

Next, the third switch 130 is a drain of the first is composed of the third NMOS transistor (M 3) connected to a node (A) and having a source grounded connection, the output from the start-up controller 150 will be described later, Off operation of the first NMOS transistor M1 and the second NMOS transistor M2 on the basis of the control signal.

Next, the startup controller 150 compares the voltage charged in the capacitor 140 with a predetermined first threshold value, and outputs a control signal for turning the third switching unit 130 on or off.

Here, the startup controller 150 may output a control signal to turn on the third switching unit 130 when the voltage charged in the capacitor 140 is equal to or greater than the first threshold value. If the third switching unit 130 is turned on, the first NMOS transistor M 1 and the second NMOS transistor M 2 are turned off.

When the voltage charged in the capacitor 140 is lower than a predetermined second threshold value, the start-up controller 150 outputs a control signal for turning off the third switching unit 130, Can be output. If the third switching unit 130 is turned off, the first NMOS transistor M 1 and the second NMOS transistor M 2 are turned on.

For example, referring to FIG. 2, the operation of the start-up circuit 100 will be described in detail as follows.

First, when the input power (HV_IN) is applied to the first resistor (R 1) becomes high, the gate voltage of the first NMOS transistor (M 1) and a first NMOS transistor (M 1) on the first resistance (R 1) and a second NMOS transistor (M 2) in addition, as whole due to its gate voltage, a first NMOS transistor (M 1) and a voltage a second pass through the NMOS transistor (M 2) capacitors on the same node ( C 1 ).

At this time, if the voltage charged in the capacitor C 1 is equal to or greater than a predetermined first threshold value (for example, 12 V), the start-up control unit 150 outputs a control signal for turning on the third NMOS transistor M 3 claim 3 NMOS transistor (M 3) is turned on, first the applied power to the resistor (R 1) is subjected to ground impact of the connected to the source terminal of claim 3 NMOS transistor (M 3), a first NMOS transistor (M 1) and the 2 NMOS transistors (the first NMOS transistor, the gate voltage of M 2) low (M 1) and the first 2 NMOS transistor (M 2) as the all-off, the capacitor (C 1) and the start-up control unit The current flows only to the first switching unit 110, the second switching unit 120, and the third switching unit 130 so that no current flows.

Accordingly, the start-up circuit is turned on to charge the input power when the power supply device is initially started, and the start-up circuit is turned off when the charged power is greater than or equal to a predetermined first threshold value, And unnecessary power consumption due to the start-up circuit can be reduced.

On the other hand, if the voltage charged in the capacitor C 1 falls below a predetermined second threshold value (for example, 10 V) lower than the first threshold value (for example, 12 V), the start- NMOS transistors are the first 3 NMOS transistor (M 3) off to output a control signal for turning off the (M 3), the first one NMOS transistor in the influence of the power applied to the first resistor (R 1) (M 1) and the The gate voltage of the second NMOS transistor M 2 becomes high, so that the first NMOS transistor M 1 and the second NMOS transistor M 2 are turned on.

Accordingly, when the Vcc voltage supplied to the switching control unit falls below a second threshold value smaller than the first threshold value, the first switching unit 110 and the second switching unit 120 are controlled to be turned on, Can be kept constant.

The power conversion unit 200 includes a primary winding 210 connected to the start up circuit 100 and a secondary winding 210 connected inductively to the primary winding 210 and connected to the output, (230).

Next, the power switching device 300 controls the current of the primary winding 210. [

Next, the switching control unit 400 is connected between the start-up circuit 100 and the power switching device 300 to control the ON / OFF operation of the power switching device 300. [

Specifically, after the switching controller 400 is initially activated by the voltage charged in the capacitor 140 of the start-up circuit 100, the switching controller 400 controls the switching of the secondary winding (inductively coupled with the primary winding 210) 230 may be supplied with power from the output terminal connected to the secondary winding 230 to maintain the Vcc voltage.

The switching control unit 400 may further include a diode D 3 having one end connected to the secondary winding 230 and the other end connected to the switching control unit 400.

For example, if the switching controller 400 is initially activated by the start-up circuit 100, the switching controller 400 controls the output terminal connected to the secondary winding 230 via the diode D 3 The power supply for maintaining the Vcc voltage can be supplied to maintain the driving state.

3 is a circuit diagram of a power supply including a high-voltage start-up circuit according to another embodiment of the present invention.

3, a power supply apparatus including a high-voltage start-up circuit according to another embodiment of the present invention includes a start-up circuit 100, a power conversion unit 200, a power switching device 300, and a switching control unit 400).

First, the description of the configuration of the start-up circuit 100 and the power switching device 300 will be omitted in the explanation of the start-up circuit 100 and the power switching device 300 according to the embodiment of the present invention So they are omitted.

The power conversion unit 200 includes a primary winding 210 and an auxiliary winding 220 connected to the start-up circuit 100 and a secondary winding 210 connected inductively to the primary winding 210, And a secondary side winding 230 connected to the secondary side winding 230.

Next, the switching controller 400 is connected between the start-up circuit 100 and the power switching device 300 to control the on / off operation of the power switching device 300.

Here, the switching controller 400 is initially activated by the voltage charged in the capacitor 140 of the start-up circuit 100, and then is inductively coupled with the primary winding 210 to generate the secondary winding 230 The auxiliary winding 220 is inductively coupled to the secondary winding 230 and is supplied with power for maintaining the Vcc voltage through the diode D 1 .

Meanwhile, the power supply apparatus including the high-voltage start-up circuit according to the embodiments of the present invention may be designed by configuring the start-up circuit 100 and the switching control unit 400 as one IC chip.

4 is a diagram for explaining the operation waveform of the power supply apparatus including the high-voltage start-up circuit according to the embodiments of the present invention.

2 and 3, the input power HV_IN is charged in the capacitor 140 through the first switching unit 110 and the second switching unit 120, The Vcc voltage and the voltage applied to the first node A and the second node B gradually increase as the Vcc voltage of the same magnitude as the voltage charged in the capacitor 140 is supplied to the startup controller 150 (0 to 1.45 ms).

If the Vcc voltage reaches a predetermined first threshold value of 12V (about 1.45 ms), the start-up control unit 150 outputs a control signal to turn on the third switching unit 130, NMOS transistor (M 3) is turned on the first NMOS transistor (M 1) and said second NMOS transistor (M 2) is as turned off, the voltage of the first node (a) and a second node (B) rapid And the Vcc voltage also gradually drops from a predetermined slope (1.45 to 2.12 ms).

Thereafter, when the Vcc voltage falls below a second threshold value smaller than the first threshold value (about 2.12 ms), the start-up control unit 150 outputs a control signal to turn off the third switching unit 130 The third NMOS transistor M 3 is turned off and the first NMOS transistor M 1 and the second NMOS transistor M 2 are turned on so that the first node A and the second node B ) Shows a sharp rise state, and the Vcc voltage rises by the first threshold value (2.12 to 2.15 ms).

As described above, in the power supply apparatus including the high-voltage start-up circuit according to the embodiments of the present invention, the start-up circuit is turned on at the initial startup of the power supply apparatus to charge the input power supply, If the Vcc voltage supplied to the power supply unit is lower than the first threshold value, the supply of power to the power supply unit is stopped. The Vcc voltage can be maintained at a constant level by controlling the start-up circuit to be turned on.

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 exemplary embodiments.

100: Start-up circuit 110: First switching unit
120: second switching unit 130: third switching unit
140: Capacitor 150: Startup control unit
200: power conversion unit 210: primary winding
220: auxiliary winding 230: secondary winding
300: Power switching device 400: Switching control part

Claims (5)

A first NMOS transistor having a drain connected to a drain of the first NMOS transistor, and a first resistor connected to a drain-gate of the first NMOS transistor;
A second NMOS transistor having a drain connected to the source of the first NMOS transistor and a gate connected to a gate of the first NMOS transistor, and a second NMOS transistor having one end connected to a gate of the first NMOS transistor and a gate of the second NMOS transistor A second switch connected to a first node and having a second end coupled to a source of the first NMOS transistor and a second node to which a drain of the second NMOS transistor is connected;
A third switching unit configured to include a third NMOS transistor having a drain connected to the first node and a source connected to ground, the third switching unit controlling ON / OFF operations of the first NMOS transistor and the second NMOS transistor;
A capacitor having one end connected to the source terminal of the second switching unit and the other end grounded; And
And a start-up control unit for comparing the voltage charged in the capacitor with a predetermined first threshold value to output a control signal for turning on or off the third switching unit. The apparatus according to claim 1, wherein the start-
And outputs a control signal to turn on the third switching unit when the voltage charged in the capacitor is equal to or greater than the first threshold value. The apparatus according to claim 1, wherein the start-
And outputs a control signal for turning off the third switching unit when the voltage charged in the capacitor is equal to or lower than a second threshold value smaller than the predetermined first threshold value. The method according to claim 1,
Wherein the first switching unit and the second switching unit are turned off when the third switching unit is turned on and the first switching unit and the second switching unit are turned on when the third switching unit is turned off. Included power supply. The method according to claim 1,
A power conversion unit including a primary winding connected to the start-up circuit, a secondary winding coupled inductively to the primary winding, and a secondary winding connected to the output;
A power switching element for controlling a current flow of the primary winding; And
Further comprising a switching control section which is initially activated by the charging power supply of the start-up circuit and which controls on / off operation of the power switching element.
KR1020150082519A 2015-06-11 2015-06-11 Power supply device comprising high-voltage startup circuits KR20160146018A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108123591A (en) * 2018-01-18 2018-06-05 深圳市富满电子集团股份有限公司 Power-switching circuit and power supply changeover device
KR20190076097A (en) * 2017-12-21 2019-07-02 매그나칩 반도체 유한회사 High voltage start-up circuit for zeroing of stanby power consumption and switching mode power supply having the same
CN112994434A (en) * 2019-12-17 2021-06-18 华润微集成电路(无锡)有限公司 Quick start circuit and power supply system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050112622A (en) 2004-05-27 2005-12-01 주식회사 케이이씨 Low power start-up circuit of self-bias

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050112622A (en) 2004-05-27 2005-12-01 주식회사 케이이씨 Low power start-up circuit of self-bias

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20190076097A (en) * 2017-12-21 2019-07-02 매그나칩 반도체 유한회사 High voltage start-up circuit for zeroing of stanby power consumption and switching mode power supply having the same
CN108123591A (en) * 2018-01-18 2018-06-05 深圳市富满电子集团股份有限公司 Power-switching circuit and power supply changeover device
CN112994434A (en) * 2019-12-17 2021-06-18 华润微集成电路(无锡)有限公司 Quick start circuit and power supply system

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