U.S. patent application number 12/844830 was filed with the patent office on 2011-10-20 for ionic thermal dissipation device.
This patent application is currently assigned to AMPOWER TECHNOLOGY CO., LTD.. Invention is credited to YU-HSIAO CHAO, WEI-CHI HUANG, TSUNG-LIANG HUNG, CHI-HSIUNG LEE, CHENG-TA LIN.
Application Number | 20110253348 12/844830 |
Document ID | / |
Family ID | 43463794 |
Filed Date | 2011-10-20 |
United States Patent
Application |
20110253348 |
Kind Code |
A1 |
HUANG; WEI-CHI ; et
al. |
October 20, 2011 |
IONIC THERMAL DISSIPATION DEVICE
Abstract
An ionic thermal dissipation device includes an ionic wind
generating system and a power system to drive the ionic wind
generating system. The power system first converts external direct
current power signals into alternating current (AC) power signals,
and boosts the AC power signals. The power system doubles voltage
of the boosted AC power signals, and rectifies the boosted AC power
signals to generate high voltage direct current power signals to
drive the ionic wind generating system. The power system also
detects current signals generated by ion excitation of the ionic
wind generating system, and regulates the high voltage direct
current power signals according to the detected current
signals.
Inventors: |
HUANG; WEI-CHI; (Jhongli
City, TW) ; CHAO; YU-HSIAO; (Jhongli City, TW)
; HUNG; TSUNG-LIANG; (Jhongli City, TW) ; LEE;
CHI-HSIUNG; (Jhongli City, TW) ; LIN; CHENG-TA;
(Jhongli City, TW) |
Assignee: |
AMPOWER TECHNOLOGY CO.,
LTD.
Jhongli City
TW
|
Family ID: |
43463794 |
Appl. No.: |
12/844830 |
Filed: |
July 28, 2010 |
Current U.S.
Class: |
165/104.34 ;
165/96 |
Current CPC
Class: |
H02M 3/33523 20130101;
H05K 7/20172 20130101 |
Class at
Publication: |
165/104.34 ;
165/96 |
International
Class: |
F28F 13/16 20060101
F28F013/16 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 20, 2010 |
CN |
201020164123.6 |
Claims
1. An ionic thermal dissipation device, comprising: an ionic wind
generating system; and a power system, the power system comprising:
a power stage circuit, operable to converting external direct
current power signals into alternating current (AC) power signals;
a transformer, operable to boost the AC power signals; a voltage
double and rectifier circuit, operable to double voltage of the
boosted AC power signals and rectify the boosted AC power signals
to generate high voltage direct current power signals suitable to
drive the ionic wind generating system; a current feedback circuit,
operable to detect current signals generated by ion excitation of
the ionic wind generating system; and a pulse width modulation
(PWM) controller, operable to control the power stage circuit to
regulate the high voltage direct current power signals according to
the detected current signals.
2. The ionic thermal dissipation device of claim 1, wherein the
current feedback circuit is connected to a low voltage end of a
secondary winding of the transformer and the PWM controller, and
detects the current signals from the low voltage end of the
secondary winding of the transformer and feedbacks the detected
current signals to the PWM controller.
3. The ionic thermal dissipation device of claim 2, wherein the
current feedback circuit comprises: a diode, comprising an anode
connected to the low voltage end of the secondary winding of the
transformer and a cathode connected to the PWM controller; a
resistor, connected between the cathode of the diode and the
ground; and a capacitor, connected between the cathode of the diode
and the ground.
4. The ionic thermal dissipation device of claim 1, wherein the
ionic wind generating system comprises: an emitting pole, operable
to receive the high voltage direct current power signals to excite
ions; and an receiving pole, operable to receive the ions excited
by the emitting pole.
5. The ionic thermal dissipation device of claim 4, wherein the
current feedback circuit is connected to the receiving pole of the
ionic wind generating system and the PWM controller, and detects
the current signals from the receiving pole of ionic wind
generating system and feedbacks the detected current signals to the
PWM controller.
6. The ionic thermal dissipation device of claim 5, wherein the
current feedback circuit comprises: a diode, comprising an anode
connected to the receiving pole of the ionic wind generating system
and a cathode connected to the PWM controller; a resistor,
connected between the cathode of the diode and the ground; and a
capacitor, connected between the cathode of the diode and the
ground.
Description
BACKGROUND
[0001] 1. Technical Field
[0002] The disclosure relates to thermal dissipation devices, and
particularly to an ionic thermal dissipation device.
[0003] 2. Description of Related Art
[0004] Ionic thermal dissipation devices usually utilize voltage
feedback. Thus, the ionic thermal dissipation devices regulate
ionic excitation voltage according to feedback voltage to control
velocity of generated ionic wind. However, temperature may
influence the ionic excitation voltage, that is, the ionic thermal
dissipation devices with same ionic excitation voltage may have
different velocities of ionic wind in different temperature
environments. Thus, the voltage feedback cannot effectively control
the velocity of ionic wind of the ionic dissipation devices. In
addition, utilizing the voltage feedback, the ionic excitation
voltages of the ionic thermal dissipation devices are set at
predetermined values, such as, 5000.about.6000V, according to
needed velocities of ionic wind, which results in arcing when the
temperature changes.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 is a schematic diagram of one embodiment of an ionic
thermal dissipation device as disclosed.
[0006] FIG. 2 is a schematic diagram of another embodiment of an
ionic thermal dissipation device as disclosed.
[0007] FIG. 3 is a circuit diagram of one embodiment of a current
feedback circuit of an ionic thermal dissipation device.
DETAILED DESCRIPTION
[0008] FIG. 1 is a schematic diagram of one embodiment of an ionic
thermal dissipation device 10 as disclosed. The ionic thermal
dissipation device 10 includes a power system 100 and an ionic wind
generating system 200. The power system 100 converts external
direct current (DC) power signals Vin into high voltage DC power
signals Vout, where the high voltage DC power signals Vout drive
the ionic wind generating system 200 to generate ionic wind to
dissipate heat. In one embodiment, the power system 100 includes a
power stage circuit 110, a pulse width modulation (PWM) controller
120, a transformer 130, a voltage double and rectifier circuit 140,
and a current feedback circuit 150. The ionic wind generating
system 200 includes an emitting pole 210 and a receiving pole
220.
[0009] In one embodiment, the power stage circuit 110 includes DC
to alternating current (AC) converter circuit to convert the
external DC power signals Vin into AC power signals. In alternative
embodiments, the power stage circuit 110 further includes a DC/DC
converter circuit to regulate voltage level of the external DC
power signals Vin. The PWM controller 120 controls the power stage
circuit 110 to regulate voltage and frequency of the AC power
signals output by the power stage circuit 110. The transformer 130
may be a boost transformer to boost the AC power signals. The
voltage double and rectifier circuit 140 doubles voltage of the
boosted AC power signals and rectifies the boosted AC power signals
to generate the high voltage DC power signals Vout to drive the
ionic wind generating system 200.
[0010] The emitting pole 210 of the ionic wind generating system
200 receives the high voltage DC power signals Vout, and excites
air ionization to generate positive ions or negative ions. The
positive ions or the negative ions move from the emitting pole 210
to the receiving pole 220, causing the air to generate the ionic
wind. At the same time, the movement of the positive ions or the
negative ions between the emitting pole 210 and the receiving pole
220 form minor currents, such as, 0.1 to 0.5 mA, that is, current
signals generated by ion excitation. If a distance between the
emitting pole 210 and the receiving pole 220 is fixed, the current
signals are proportionate to ion concentration of the ionic wind
generating system 200. That is, the current signals are
proportionate to velocity of the ionic wind. For example, when the
distance between the emitting pole 210 and receiving pole 220 is 7
mm, if the current signal generated by the ion excitation is
changed from 0.1 mA to 0.5 mA, the velocity of the ionic wind needs
to be changed from 1.4 m/s to 2.0 m/s. In addition, when the ionic
thermal dissipation device 10 arcs, the current signal becomes
apparently high due to discharge between the emitting pole 210 and
the receiving pole 220.
[0011] The current feedback circuit 150 detects the current signals
generated by the ion excitation of the ionic wind generating system
10, and feedbacks the detected current signals to the PWM
controller 120. Thus, the PWM controller 120 regulates the voltage
and the frequency of the AC power signals output by the power stage
circuit 110 to control the voltage of the high voltage DC power
signals Vout output by the power system 100. Because environmental
temperatures have no influence on the current signals generated by
the ion excitation, thus, current feedback can effectively regulate
velocity of the ionic wind of the ionic wind generating system 200.
In addition, when the current signals exceed a predetermined value,
for example 1A, the PWM controller 120 determines the ionic thermal
dissipation device 10 arcs, and turns off the power stage circuit
110 to implement arcing protection.
[0012] As shown in FIG. 1, the current feedback circuit 150 is
connected to a low voltage end of a secondary winding of the
transformer 130 and the PWM controller 120. The current feedback
circuit 150 detects the current signals from the low voltage end of
the secondary winding of the transformer 130, and feedbacks the
detected current signals to the PWM controller 120. As shown in
FIG. 3, the current feedback circuit 150 includes a diode D1, a
resistor R1, and a capacitor C1. The diode D1 detects and rectifies
the current signals, and has an anode connected to the low voltage
end of the secondary winding of the transformer 130 and a cathode
connected to the PWM controller 120. The capacitor C1 is connected
between the cathode of the diode D1 and the ground, and suppresses
noises of the current signals. The resistor R1 is connected between
the cathode of the diode D1 and the ground, and forms voltage
signals according to the current signals to control the PWM
controller 120.
[0013] FIG. 2 is a schematic diagram of another embodiment of an
ionic thermal dissipation device 10' as disclosed. In this
embodiment, the current feedback circuit 150 is connected to the
receiving pole 220 of the ionic wind generating circuit 200 and the
PWM controller 120, and other structures and connections of the
ionic thermal dissipation device 10' are similar to those of the
ionic thermal dissipation device 10 of FIG. 1. Therefore,
descriptions are omitted here. The current feedback circuit 150
detects the current signals from the receiving pole 220 of the
ionic wind generating system 200, and feedbacks the detected
current signals to the PWM controller 120. Accordingly, the anode
of the diode D1 of the current feedback circuit 150 is connected to
the receiving pole 220 of the ionic wind generating system 200, and
the cathode of the diode D1 is connected to the PWM controller
120.
[0014] The ionic thermal dissipation devices 10 and 10' utilize
current feedback, which avoids influence of environmental
temperatures, and effectively control velocity of the ionic wind of
the ionic thermal dissipation devices 10 and 10' and implement
arcing protection.
[0015] The foregoing disclosure of various embodiments has been
presented for purposes of illustration and description. It is not
intended to be exhaustive or to limit the invention to the precise
forms disclosed. Many variations and modifications of the
embodiments described herein will be apparent to one of ordinary
skill in the art in light of the above disclosure. The scope of the
invention is to be defined only by the claims appended hereto and
their equivalents.
* * * * *