KR20130028845A - Active damper and driving method thereof - Google Patents

Active damper and driving method thereof Download PDF

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KR20130028845A
KR20130028845A KR1020120039958A KR20120039958A KR20130028845A KR 20130028845 A KR20130028845 A KR 20130028845A KR 1020120039958 A KR1020120039958 A KR 1020120039958A KR 20120039958 A KR20120039958 A KR 20120039958A KR 20130028845 A KR20130028845 A KR 20130028845A
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South Korea
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damper
resistor
switch
voltage
input
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KR1020120039958A
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Korean (ko)
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KR101847520B1 (en
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엄현철
양승욱
조계현
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페어차일드코리아반도체 주식회사
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Priority to US13/473,908 priority Critical patent/US8816592B2/en
Publication of KR20130028845A publication Critical patent/KR20130028845A/en
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Abstract

 An embodiment of the present invention relates to an active damper and a driving method thereof. AC input through the dimmer is passed to the active damper through the rectifier circuit. The active damper includes a damper resistor connected to the rectifier circuit; A damper switch connected in parallel to the damper resistor; And a delay circuit for delaying the turn-on time of the damper switch by a predetermined initial period from the dimmer turn-on time.

Figure P1020120039958

Description

ACTIVE DAMPER AND DRIVING METHOD THEREOF

An embodiment of the present invention relates to an active damper and a driving method thereof.

The AC input through the dimmer is rectified through the rectifier circuit and supplied to the power supply. The AC input rectified through the rectifier circuit becomes the input voltage and input current of the power supply.

The AC input through the dimmer is clipped according to the dimming angle. That is, only one portion of the sinewave AC input corresponding to the dimming angle passes through the dimmer.

When the AC input passing through the dimmer is rectified, a portion where the input voltage and the input current rises sharply occurs, and a spike of the input voltage or ringing of the input current occurs at that portion. Moreover, the negative current caused by the ringing of the input current causes a problem of turning off the dimmer.

Dampers are devices located between the rectifier circuit and the power supply to prevent spikes in the input voltage and ringing of the input current. Generally, dampers are implemented with resistors.

At this time, spikes and ringing cannot be effectively prevented when using low resistance. Therefore, power consumption and temperature generated by the damper resistance become a problem.

1 is a diagram illustrating an input voltage and an input current when a 25 kV damper resistor is used.

2 is a diagram illustrating an input voltage and an input current when a 200 kV damper resistor is used.

As shown in Fig. 1, when 25 kHz is used, spikes in the input voltage and ringing of the input current occur.

However, as shown in FIG. 2, spikes of the input voltage and ringing of the input current do not occur in the circle region indicated by the dotted line.

However, as mentioned above, power consumption and temperature increase are problematic.

 It is an object of the present invention to provide an active damper capable of preventing an increase in power consumption and temperature and a driving method thereof.

In the active damper according to the embodiment of the present invention, an AC input passing through the dimmer is transmitted through the rectifier circuit. The active damper may include: a damper resistor connected to the rectifier circuit; A damper switch connected in parallel to the damper resistor; And a delay circuit for delaying a turn-on time of the damper switch by a predetermined initial period from the dimmer turn-on time.

The delay circuit includes a resistor including one end connected to one end of the damper resistor, and a capacitor connected between the other end of the resistor and the other end of the damper resistor.

The damper switch includes a gate electrode connected to a contact of the resistor and the capacitor.

The active damper further includes a reset circuit for resetting the delay circuit. The delay circuit includes a cathode electrode connected to one end of the damper resistor and an anode electrode connected to a gate electrode of the damper switch. It includes.

The input current through the rectifier circuit flows to the power supply device through the active damper. During the initial period, the input current flows through the damper resistor, and after the initial period elapses, flows through the damper switch.

According to an embodiment of the present invention, an active damper includes a damper switch and a damper switch connected in parallel to the damper resistor. Charging a capacitor connected between an electrode and a source electrode, and turning on the damper switch by turning on the gate-source voltage of the damper switch by a voltage charged in the capacitor during the initial period, thereby reaching a threshold voltage. Include.

The driving method of the active damper may further include maintaining a voltage of both ends of the damper resistor at the threshold voltage during a normal period when the damper switch is turned on.

The driving method of the active damper further includes the step of input current passing through the rectifier circuit flowing through the damper resistor during the initial period, and the input current flowing through the damper switch during the normal period.

In the method of driving the active damper, the diode is conductive when the voltage across the damper resistor is lower than the threshold voltage of the damper switch by the reduction of the input current through the rectifier circuit, and the conductive diode Further comprising the step of discharging the voltage charged in the capacitor through.

Provided are an active damper capable of preventing an increase in power consumption and temperature, and a driving method thereof.

1 is a diagram illustrating an input voltage and an input current when a 25 kV damper resistor is used.
2 is a diagram illustrating an input voltage and an input current when a 200 kV damper resistor is used.
3 is a view showing an active damper according to an embodiment of the present invention.
4 is a waveform diagram illustrating an input voltage, an input current, a gate voltage, and a drain-source voltage generated when an active damper according to an exemplary embodiment of the present invention is applied.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

3 is a view showing an active damper according to an embodiment of the present invention.

As shown in FIG. 3, the active damper 1 is connected between the bridge diode 3 and a switch mode power supply (hereinafter referred to as SMPS) 4. The bridge diode 3 is an example of a rectifier circuit, and the SMPS 4 is an example of a power supply.

The AC input AC is input to the bridge diode 3 through the dimmer 2. Only the portion corresponding to the dimming angle remains in the AC input AC passing through the dimmer 2. According to the dimming angle, a portion of the AC input AC passing through the dimmer 2 is determined. As the dimming angle is larger, the portion passing through the dimmer 2 in one cycle of the AC input increases.

The bridge diode 3 rectifies the AC input AC passing through the dimmer 2 to generate an input voltage Vin and an input current Iin.

The active damper 1 operates with a high resistance during the initial period of one period of the input voltage Vin and the input current Iin and then with a low resistance during the normal period of the rest of the period. The active damper 1 repeats this operation every cycle of the input voltage Vin and the input current Iin.

The period from when the dimmer 2 is turned on to the next turn on time is one period of the input voltage Vin and the input current Iin. When the dimmer 2 is turned on, the input voltage Vin and the input current Iin are generated, and at this time, the input voltage Vin and the input current Iin increase rapidly.

When the active damper 1 operates with a high resistance during the initial period from the time when the input voltage Vin and the input current Iin rise sharply, the spike of the input voltage Vin and the ringing of the input current Iin can be prevented. Can be.

At the end of the initial period, since spikes and ringing due to the rise of the input voltage Vin and the input current Iin do not occur, the active damper 1 is kept low during the normal period in order to prevent high power consumption and temperature rise. It acts as an equivalent resistor.

Hereinafter, the period means a period of the input voltage Vin and the input current Iin.

As shown in FIG. 3, the active damper 1 includes a delay circuit 10, a reset circuit 20, a damper switch Q, and a damper resistor RD. The reset circuit 20 according to the embodiment of the present invention is implemented with a diode (D). However, the present invention is not limited thereto.

One end of the damper resistor RD is connected to the output terminal of the bridge diode 3, and the other end of the damper resistor RD is connected to the input terminal of the SMPS 4. A smoothing capacitor C2 for smoothing the input voltage Vin is connected between the input terminal of the SMPS 4 and the ground.

The damper switch Q is connected in parallel to the damper resistor RD. Since the damper switch Q according to the embodiment of the present invention is an N-channel transistor, the drain electrode of the damper switch Q is connected to the output terminal of the bridge diode 3, and the source electrode of the damper switch Q is It is connected to the input of the SMPS 4. Therefore, the input voltage Vin and the input current Iin are transmitted to the SMPS 4 through the damper resistor RD or the damper switch Q.

The delay circuit 10 controls the active damper 1 so that the active damper 1 can operate only with the damper resistor RD for an initial period from the time when the dimmer 2 is turned on. That is, the delay circuit 10 delays the turn-on of the damper transistor Q during the initial period of every cycle.

The delay circuit 10 includes a resistor R1 and a capacitor C1. One end of the resistor R1 is connected to one end of the damper resistor RD and the input voltage Vin, the other end of the resistor R1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is It is connected to the other end of the damper resistor RD. The gate electrode of the damper switch Q is connected to one end of the capacitor C1.

When the dimmer 2 is turned on to generate the input voltage Vin, the capacitor C1 is charged during the initial period. When the voltage difference between the gate electrode and the source electrode of the damper switch Q reaches the threshold voltage of the damper switch Q by charging the capacitor C1, the damper switch Q is turned on.

Since the damper switch Q is turned off during the initial period, the input voltage Vin and the input current Iin are transmitted to the SMPS 4 through the damper resistor RD. The initial period ends when the damper switch Q is turned on.

Since the damper switch Q is turned on by the voltage charged in the capacitor C1, and the capacitor C1 is an open circuit from a DC perspective, the current delivered to the capacitor C1 through the resistor R1 is Does not occur. Thus, the gate-source voltage of the damper switch Q is kept constant at the threshold voltage of the damper switch Q charged by the capacitor C1.

At this time, since the drain electrode and the gate electrode of the damper switch Q are short-circuited, the voltage between the drain electrode and the source electrode of the damper switch Q is equal to the voltage between the gate electrode and the source electrode. Therefore, the voltage across the damper resistor RD is constantly regulated to the threshold voltage of the damper switch Q.

The period during which the damper switch Q remains on-state is a normal period, during which the input voltage Vin and the input current Iin are transmitted to the SMPS 4 through the damper switch Q.

Therefore, during the normal period, the resistance of the active damper 1 is maintained at a low resistance because the resistance of the damper switch Q is on.

The diode D, which is the reset circuit 20, is turned on when the voltage across the damper resistor RD becomes lower than the threshold voltage of the damper switch Q due to the decrease in the input current Iin. That is, the reset circuit 20 operates when the voltage across the damper resistor RD becomes lower than the threshold voltage of the damper switch Q.

When the diode D is turned on, the voltage charged in the capacitor C1 is discharged through the diode D. At this time, the damper switch Q is turned off.

Hereinafter, the operation of the active damper 1 will be described in detail with reference to FIG. 4.

4 is a waveform diagram illustrating an input voltage, an input current, a gate voltage, and a drain-source voltage generated when the active damper 1 according to an exemplary embodiment of the present invention is applied. The drain-source voltage is equal to the voltage across the damper resistor RD.

As shown in FIG. 4, the dimmer 2 is turned on at a time point T1 to generate an input voltage Vin and an input current Iin. The capacitor C1 starts to be charged by the input voltage Vin, and the gate voltage VG starts to increase from the time point T1.

From the time point T1, since the drain-source voltage VDS is a voltage generated when the input current Iin flows through the damper resistor RD, the drain-source voltage VDS is the same waveform as the input current Iin.

When the gate voltage VG reaches the threshold voltage Vth of the damper switch Q at the time point T2, the damper switch Q is turned on, and the drain-source voltage VDS drops sharply to the threshold voltage Vth. . From the time point T2, the drain-source voltage VDS is kept constant at the threshold voltage Vth.

When the input current Iin decreases at the time point T3 and the voltage across the damper resistor RD becomes smaller than the threshold voltage Vth, the voltage of the capacitor C1 is discharged by the diode D. Then, the gate voltage VG becomes smaller than the threshold voltage Vth, and the damper switch Q is turned off, and the drain-source voltage VDS is generated when the input current Iin flows through the damper resistor RD. It becomes a voltage. That is, it decreases with the input current Iin.

In FIG. 4, periods T1-T2 are initial periods, and periods T2-T3 are normal periods.

As described above, according to an embodiment of the present invention, the spike of the input voltage Vin and the ringing of the input current Iin are prevented by the damper resistor RD during the initial period, and the voltage between both ends of the damper resistor RD in the normal period. Is regulated to the threshold voltage of the damper switch (Q) to prevent power consumption increase and temperature rise.

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, It belongs to the scope of right.

Active damper 1, delay circuit 10, reset circuit 20
Damper switch (Q), damper resistor (RD), bridge diode (3)
Smooth Capacitor (C2), SMPS (4), Resistor (R1)
Capacitor (C1), Diode (D), Dimmer (2)

Claims (11)

An active damper in which an AC input through a dimmer is transmitted through a rectifier circuit,
A damper resistor connected to said rectifier circuit;
A damper switch connected in parallel to the damper resistor; And
And a delay circuit for delaying a turn-on time of the damper switch by a predetermined initial period from the dimmer turn-on time. The method of claim 1,
Wherein the delay circuit comprises:
A resistor including one end connected to one end of the damper resistor, and
And a capacitor connected between the other end of the resistor and the other end of the damper resistor. The method of claim 2,
The damper switch,
And a gate electrode connected to the contact of the resistor and the capacitor. The method of claim 1,
And a reset circuit for resetting the delay circuit. 5. The method of claim 4,
Wherein the delay circuit comprises:
And a diode comprising a cathode electrode connected to one end of the damper resistor and an anode electrode connected to a gate electrode of the damper switch. The method of claim 1,
The input current passing through the rectifier circuit flows through the active damper to the power supply device. The method according to claim 6,
The input current flows through the damper resistor during the initial period, and through the damper switch after the initial period elapses. In the driving method of the active damper in which the AC input passing through the dimmer is transmitted through the rectifier circuit,
The active damper includes a damper switch and a damper switch connected in parallel to the damper resistor,
Charging a capacitor connected between the gate electrode and the source electrode of the damper switch for an initial period from the turn-on time of the dimmer, and
And turning on the damper switch when the gate-source voltage of the damper switch reaches a threshold voltage by a voltage charged in a capacitor during the initial period. 9. The method of claim 8,
And maintaining a constant voltage across the damper resistor at the threshold voltage during a normal period of time when the damper switch is turned on. 10. The method of claim 9,
An input current through the rectifier circuit flows through the damper resistor during the initial period, and
And driving the input current through the damper switch during the normal period. 9. The method of claim 8,
The diode conducting when the voltage across the damper resistor becomes lower than the threshold voltage of the damper switch due to the reduction of the input current passing through the rectifier circuit; and
And discharging the voltage charged in the capacitor through the conductive diode.



KR1020120039958A 2011-05-19 2012-04-17 Active damper and driving method thereof KR101847520B1 (en)

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Application Number Priority Date Filing Date Title
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US201161488058P 2011-05-19 2011-05-19
US61/488,058 2011-05-19

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KR101847520B1 KR101847520B1 (en) 2018-04-10

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160142153A (en) * 2015-06-02 2016-12-12 주식회사 일렉스코리아 Dampper Circuit used in the Dimmer Circuit of Electric Ballast for LED Lamp with Dimming Control Function

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5333768B2 (en) * 2009-09-04 2013-11-06 東芝ライテック株式会社 LED lighting device and lighting device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160142153A (en) * 2015-06-02 2016-12-12 주식회사 일렉스코리아 Dampper Circuit used in the Dimmer Circuit of Electric Ballast for LED Lamp with Dimming Control Function

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