KR101847520B1 - Active damper and driving method thereof - Google Patents

Active damper and driving method thereof Download PDF

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Publication number
KR101847520B1
KR101847520B1 KR1020120039958A KR20120039958A KR101847520B1 KR 101847520 B1 KR101847520 B1 KR 101847520B1 KR 1020120039958 A KR1020120039958 A KR 1020120039958A KR 20120039958 A KR20120039958 A KR 20120039958A KR 101847520 B1 KR101847520 B1 KR 101847520B1
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KR
South Korea
Prior art keywords
damper
resistor
switch
voltage
input current
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KR1020120039958A
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Korean (ko)
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KR20130028845A (en
Inventor
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. The AC input passed through the dimmer is passed through the rectifier circuit to the active damper. The active damper includes a damper resistor connected to the rectifying 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 R1020120039958

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an active damper and an active damper,

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 is the input voltage and input current of the power supply.

The alternating current input through the dimmer is muted according to the dimming angle. That is, only one portion corresponding to the dimming angle passes through the dimmer during one cycle of the sinewave AC input.

When the AC input passed through the dimmer is rectified, a portion where the input voltage and the input current suddenly rise occurs, and a spike of the input voltage or ringing of the input current occurs at that portion. Furthermore, a negative current due to the ringing of the input current causes a problem that the dimmer is turned off.

The damper is an element located between the rectifier circuit and the power supply to prevent spikes in the input voltage and ringing of the input current. Generally, the damper is implemented as a resistor.

At this time, if a low resistance is used, spike and ringing can not be effectively prevented. Therefore, power consumption and temperature caused by the damper resistance become a problem.

1 is a diagram showing an input voltage and an input current when a 25? Damper resistor is used.

Fig. 2 is a graph showing the input voltage and the input current when a 200? Damper resistor is used. Fig.

As shown in Fig. 1, when 25? Is used, the input voltage spike and the input current ringing occur.

However, as shown in FIG. 2, when 200 OMEGA is used, the spike of the input voltage and the ringing of the input current do not occur in the circle region indicated by the dotted line.

However, as mentioned above, there is a problem of power consumption and temperature increase.

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

In the active damper according to the embodiment of the present invention, the AC input passing through the dimmer is transmitted through the rectifying circuit. Wherein the active damper comprises: a damper resistor connected to the rectifying 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.

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 the resistor and a contact of the capacitor.

Wherein the delay circuit further includes a diode including 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 input current that has passed through the rectifier circuit flows to the power supply through the active damper. During the initial period, the input current flows through the damper resistor and flows through the damper switch after the initial period has elapsed.

According to an embodiment of the present invention, there is provided an active damper including a damper resistor and a damper switch connected in parallel to the damper resistor. The method of driving the active bumper includes the steps of: A step of charging the capacitor connected between the electrode and the source electrode, and a step of turning on the damper switch by the gate-source voltage of the damper switch reaching the threshold voltage by the voltage charged in the capacitor during the initial period .

The method of driving the active damper further includes the step of maintaining a voltage across the damper resistor at the threshold voltage during a normal period during which the damper switch is turned on.

The method of driving the active damper further includes the step of the 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.

The method of driving an active damper according to claim 1, wherein a diode is turned on when a voltage across the damper resistor becomes lower than a threshold voltage of the damper switch due to a decrease in an input current passing through the rectifier circuit, And discharging the charged voltage to the capacitor through the capacitor.

An active damper capable of preventing power consumption and temperature increase and a driving method thereof are provided.

1 is a diagram showing an input voltage and an input current when a 25? Damper resistor is used.
Fig. 2 is a graph showing the input voltage and the input current when a 200? Damper resistor is used. Fig.
3 is a view illustrating 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 embodiment of the present invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out 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 order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters 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 illustrating an active damper according to an embodiment of the present invention.

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

The AC input AC is input to the bridge diode 3 through the dimmer 2. The AC input AC that has passed through the dimmer 2 has only the portion corresponding to the dimming angle. The part passing through the dimmer 2 in the AC input AC is determined according to the dimming angle. The larger the dimming angle, the greater the portion of the AC input AC that passes through the dimmer 2 during one cycle.

The bridge diode 3 rectifies an AC input AC that has passed 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 operates with a low resistance during the normal period during 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 the time when the dimmer 2 is turned on to the time when the next turn on is one cycle of the input voltage Vin and the input current Iin. The input voltage Vin and the input current Iin are generated at the time when the dimmer 2 is turned on and the input voltage Vin and the input current Iin abruptly rise at this time.

When the active damper 1 operates with a high resistance for the initial period from the time when the input voltage Vin and the input current Iin abruptly increase, the spike of the input voltage Vin and the occurrence of the ringing of the input current Iin .

At the end of the initial period, spikes and ringing due to the rise of the input voltage Vin and the input current Iin do not occur. Therefore, in order to prevent high power consumption and temperature rise, the active damper 1 is low It operates with equivalent resistance.

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

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. 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 connected to the output terminal of the bridge diode Q. The damper switch Q according to the embodiment of the present invention is an N- And is connected to the input terminal of the SMPS 4. 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 during the 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 each period.

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 while the other end of the resistor R1 is connected to one end of the capacitor C1, And 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 and the input voltage Vin is generated, the capacitor C1 is charged for 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 the charging of 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 at the time point 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 in terms of DC, the current that is transmitted to the capacitor C1 through the resistor R1 is Does not occur. Therefore, 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 both-end voltage of the damper resistor RD is constantly regulated to the threshold voltage of the damper switch Q.

The input voltage Vin and the input current Iin are transmitted to the SMPS 4 through the damper switch Q during a period in which the damper switch Q is maintained in the ON state.

Therefore, during the normal period, the resistance of the active damper 1 is kept low because it is the on resistance of the damper switch Q.

The diode D which is the reset circuit 20 becomes conductive when the voltage across the damper resistor RD becomes lower than the threshold voltage of the damper switch Q by the decrease of the input current Iin. That is, the reset circuit 20 operates when the both-end voltage of 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 is a waveform diagram showing an input voltage, an input current, a gate voltage, and a drain-source voltage generated when the active damper 1 according to the 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 the time point T1, and the input voltage Vin and the input current Iin are generated. 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, the drain-source voltage VDS is a voltage generated when the input current Iin flows through the damper resistor RD, and therefore 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 to the threshold voltage Vth . From the time point T2, the drain-source voltage VDS is kept constant at the threshold voltage Vth.

The voltage of the capacitor C1 is discharged by the diode D when the input current Iin decreases at the time point T3 and the both-end voltage of the damper resistor RD becomes smaller than the threshold voltage Vth. Then, the gate voltage VG becomes smaller than the threshold voltage Vth, the damper switch Q is turned off, and the drain-source voltage VDS is generated when the input current Iin flows into the damper resistor RD Voltage. That is, it decreases in accordance 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 the 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 across both ends of the damper resistor RD 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.

The active damper 1, the delay circuit 10, the reset circuit 20,
The damper switch Q, the damper resistor RD, the bridge diode 3,
The smoothing capacitor C2, the SMPS 4, the resistor R1,
The capacitor C1, the diode D, the dimmer 2,

Claims (11)

An active damper in which an AC input passed through a dimmer is transmitted through a rectifying circuit,
A damper resistor connected to the rectifying circuit;
A damper switch connected in parallel to the damper resistor; And
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,
And the damper switch is turned off based on a voltage across the damper resistor after the damper switch is turned on. The method according to 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. 3. The method of claim 2,
The damper switch includes:
And a gate electrode connected to the resistor and the contact of the capacitor. The method according to claim 1,
Further comprising a reset circuit for resetting the delay circuit based on the voltage across the damper resistor. 5. The method of claim 4,
The reset circuit comprising:
And a diode including 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 according to claim 1,
And an input current passed through the rectifier circuit flows to the power supply through the active damper. The method according to claim 6,
Wherein the input current flows through the damper resistor during the initial period and flows through the damper switch after the initial period has elapsed. A method of driving an active damper in which an AC input passed through a dimmer is transmitted through a rectifying circuit,
Wherein the active damper includes a damper resistor and a damper switch connected in parallel with the damper resistor,
Charging the capacitor connected between the gate electrode and the source electrode of the damper switch during the initial period from the turning on of the dimmer,
Wherein the gate-source voltage of the damper switch reaches a threshold voltage by the voltage charged in the capacitor during the initial period so that the damper switch is turned on, and
And turning off the damper switch based on the voltage across the damper resistor after the damper switch is turned on. 9. The method of claim 8,
Further comprising the step of: maintaining a voltage across the damper resistor at the threshold voltage during a normal period when the damper switch is turned on. 10. The method of claim 9,
An input current passing through the rectifier circuit flows through the damper resistor during the initial period, and
Wherein the input current flows through the damper switch during the normal period. 9. The method of claim 8,
When the voltage across the damper resistor becomes lower than the threshold voltage of the damper switch by the decrease of the input current passing through the rectifying circuit,
And discharging the charged voltage to the capacitor through the conducting diode.



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

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US201161488058P 2011-05-19 2011-05-19
US61/488,058 2011-05-19

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KR101708773B1 (en) * 2015-06-02 2017-03-08 주식회사 일렉스코리아 Dampper Circuit used in the Dimmer Circuit of Electric Ballast for LED Lamp with Dimming Control Function

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110057578A1 (en) * 2009-09-04 2011-03-10 Toshiba Lighting & Technology Corporation Led lighting device and illumination apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110057578A1 (en) * 2009-09-04 2011-03-10 Toshiba Lighting & Technology Corporation Led lighting device and illumination apparatus

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