EP2480946A1 - Cooling control circuit for peltier device - Google Patents

Cooling control circuit for peltier device

Info

Publication number
EP2480946A1
EP2480946A1 EP10776192A EP10776192A EP2480946A1 EP 2480946 A1 EP2480946 A1 EP 2480946A1 EP 10776192 A EP10776192 A EP 10776192A EP 10776192 A EP10776192 A EP 10776192A EP 2480946 A1 EP2480946 A1 EP 2480946A1
Authority
EP
European Patent Office
Prior art keywords
switching device
control circuit
output
filter
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10776192A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yutaka Uratani
Mikihiro Yamashita
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2480946A1 publication Critical patent/EP2480946A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1951—Control of temperature characterised by the use of electric means with control of the working time of a temperature controlling device

Definitions

  • the present invention relates to a cooling control circuit for a Peltier device.
  • a patent document 1 discloses a technique to produce condensed water from moisture of the air by a cooling control of a Peltier device.
  • the Peltier device cools a discharge electrode to generate condensed water thereon from moisture of the air.
  • a high voltage is applied to the condensed water via the discharge electrode, thereby charged water fine particles are generated by an electrostatic atomization of the condensed water.
  • the charged water fine particles include radicals, and the typical sizes are a few to tens of nanometers.
  • the charged water fine particles are sometimes called as fine water droplets or nano-sized mist.
  • a step-down chopper (buck chopper) circuit is used as a control circuit for cooling the Peltier device.
  • the step-down chopper circuit outputs a voltage to cool the Peltier device by an oscillation of a switching device (e.g. Field Effect Transistor) therein.
  • a switching device e.g. Field Effect Transistor
  • the switching device oscillates continuously, and thereby outputs the voltage having a waveform as shown in Fig. 3. Therefore, when a switching frequency of the switching device becomes higher, a power is more continuously supplied to the Peltier device, and thus a rising rate of temperature of the Peltier device will increase.
  • the present invention has been made with consideration of the above situation, and the object is to provide a cooling control circuit of a Peltier device capable of reducing a rising rate of temperature of the Peltier device and of reducing noises in an output voltage to the Peltier device.
  • An aspect of the present invention is a cooling control circuit for a Peltier device comprising: a switching device; an LC filter connecting between the switching device and the Peltier device, the LC filter smoothing an output from the switching device; an amplifier circuit amplifying an output from the LC filter; and a switching device control circuit configured to control an on-state and off-state of the switching device based on a level of an output from the amplifier circuit.
  • the amplifier circuit delays and amplifies the output from the LC filter so that a maximum level of the output from the LC filter reaches a level at which the switching device control circuit brings a switching device into the off-state.
  • Fig. 1 is a schematic circuit diagram showing a cooling control circuit for a Peltier device according to an embodiment of the present invention.
  • Fig. 2 shows a waveform of an intermittent oscillation generated in the cooling control circuit shown in Fig. 1.
  • Fig. 3 shows a waveform of a continuous oscillation generated in a conventional cooling control circuit.
  • Fig. 4 is a schematic diagram showing a configuration of an electrostatic atomizer using a cooling control circuit for a Peltier device according to an embodiment of the present invention.
  • Fig. 4 is a schematic diagram showing a configuration of an electrostatic atomizer using a cooling control circuit 10 of a Peltier device 1 according to the embodiment of present invention.
  • the Peltier device 1 has: a pair of a P-channel semiconductor 1a and an N-channel semiconductor 1b; a connecting portion 1c electrically connected with the cold sides of the P-channel and N-type semiconductors 1a and 1b; electrically conductive members 1d and 1d for heat radiation, which are made of electrically conductive material and are connected with the hot sides of the P-channel and N-type semiconductors 1a and 1b, respectively; and lead wires 1e and 1e connected with the electrically conductive members 1d and 1d.
  • a discharge electrode 7 is provided the connecting portion 1c in a protruding manner.
  • a case 8 is provided in the electrostatic atomizer.
  • the case 8 is made of electrically insulating material and is formed into a tubular shape having a bottom wall 8a at an end thereof.
  • a through hole 8b is formed in the bottom wall 8a.
  • the electrically conductive members 1d and 1d are inserted into the through hole 8b and fixed to the case 8. Accordingly, the discharge electrode 7 is accommodated in the case 8.
  • the case 8 has an opening portion at another end opposite to the end at which the bottom wall 8a is provided. At the opening portion, an electrode 9 is supported so as to face to the discharge electrode 7.
  • the electrode 9 is formed into a ring shape having a discharge hole 12 at the center thereof. The electrode 9 is grounded.
  • Each lead wire 1e is electrically connected to an electric wire.
  • the electric wire is connected to the cooling control circuit 10.
  • the cooling control circuit 10 includes a power supply (not shown).
  • a high voltage supplier 11 is connected to the electric wire.
  • the high voltage supplier 11 applies a high voltage to the discharge electrode 7.
  • the cooling control circuit 10 has a switching power supply circuit (switching power supply) 2 as described later.
  • a cooling control of the Peltier device 1 is carried out by an output from the switching power supply circuit 2.
  • the connecting portion 1c is cooled and thereby the discharge electrode 7 projecting from the connecting portion 1c is also cooled.
  • the discharge electrode 7 is cooled, moisture of the air is condensed on the discharge electrode 7 as condensed water.
  • cooling of the discharge electrode 7 supplies water thereto.
  • heat generated in the cooling is radiated from the electrically conductive members 1d and 1d.
  • the high voltage supplier 11 applies a high voltage to the discharge electrode 7 while the condensed water adheres on the discharge electrode 7, an electrostatic atomization of the condensed water is generated.
  • the electrostatic atomization large amount of charged water fine particles is produced.
  • the charged water fine particles include radicals, and the typical sizes are a few to tens of nanometers.
  • the charged water fine particles are sometimes called as fine water droplets or nano-sized mist.
  • Fig. 1 shows an exemplary configuration of the switching power supply circuit 2 which is configured as a step-down chopper (buck chopper) circuit.
  • the switching power supply circuit 2 has: a switching device 3; inductor 13; a smoothing capacitor (hereinafter referred to as capacitor) 4 on the output side; diode 14; amplifier circuit 6; switching device control circuit (switching device controller) IC.
  • the reference numbers 16 and 17 indicate capacitors.
  • the switching device 3 is a P-channel MOSFET (Metal Oxide Semiconductor Field Effect Transistor). A gate terminal of the switching device 3 is connected to the switching device control circuit IC through a resistor R4, and the switching device 3 receives a PWM (Pulse Width Modulation) control signal therefrom.
  • the switching device 3 is in an on-state when the PWM control signal is in a low-state, and it is in an off-state when the PWM control signal is in a high-state.
  • a source terminal of the switching device 3 is connected to a power supply (not shown), and a drain terminal thereof is connected to an LC filter including the inductor 13 and capacitor 4. Specifically, the drain terminal is connected to a positive terminal of the capacitor 4 through the inductor 13.
  • Both terminals of the capacitor 4 are connected to the Peltier device 1.
  • An output from the switching device 3 is smoothed by the LC filter, sent to the Peltier device 1, and thereby the Peltier device 1 is cooled.
  • the amplifier circuit (amplifier) 6 amplifies and a voltage or current from the LC filter and outputs it to the switching device control circuit IC.
  • the amplifier circuit 6 is a non-inverting amplify circuit including: an operational amplifier OP; and two resistors R1 and R2 that determines a gain (amplification factor) of the amplifier circuit 6.
  • the resistor R1 is connected between an inverting input terminal and an output terminal of the operational amplifier OP.
  • the resistor R2 is connected between the inverting input terminal of the operational amplifier and the ground.
  • a non-inverting input terminal of the operation amplifier OP is connected to the positive terminal of the capacitor 4 through a resistor R3. An output from the operational amplifier OP is received by the switching device control circuit IC.
  • the amplifier circuit 6 delays the output from the LC filter by a response lag (delay) characteristics of the operational amplifier OP.
  • the gain of the amplifier circuit 6 is set to a value at which the switching device control circuit IC brings the switching device into the off state.
  • the gain is about 120 or 20 when the amplifier circuit is a current-voltage amplifier or voltage-voltage amplifier, respectively.
  • the gain is set depending on electric characteristics of the Peltier device 1, the inductor 13, capacitor 4, for example. Therefore, the present invention is not limited to these values as described above.
  • the switching device control circuit IC oscillates intermittently the switching device 3 (the detail is described later).
  • the switching device control circuit IC outputs the PWM control signal to the switching device 3 to control the on-state and the off-state thereof. Whether the PWM control signal comes into the on-state or the off-state depends on a level of the output from the amplify circuit 6, which the switching device control circuit IC receives. Specifically, while the level is lower than a predetermined threshold level (e.g. a threshold voltage), the PWM control signal is in the low-state, and thereby the switching device 3 is brought into the on-state. Alternatively, while the level is higher than the predetermined threshold level, the PWM control signal is in the high-state, and thereby the switching device 3 is brought into the off-state.
  • a predetermined threshold level e.g. a threshold voltage
  • the switching device control circuit IC may include an oscillator (not shown) which generates an oscillation signal having a predetermined frequency. In this case, when the switching device control circuit IC receives an output from the LC filter as a feedback signal without passing through the amplify circuit 6, the switching device control circuit IC outputs a PWM control signal having a duty ration based on the received the output level. That is, the switching device control circuit IC monitors the output from the LC filter in real time.
  • a switching frequency in the present embodiment does not depend on a frequency of the foregoing oscillator.
  • the switching device control circuit IC since the switching device control circuit IC receives an output from the LC filter through the amplify circuit 6, the output of the amplify circuit 6 changes with a delay with respect to a change of the output of the LC filter due to the response delay characteristics of the amplify circuit 6. Accordingly, even when the switching device 3 comes into an on-state by a low-state of the PWM control signal, an output from the switching device control circuit IC does not immediately increase. Consequently, the switching device control circuit IC maintains the low-state of the PWM control signal, and thereby the on-state of the switching device 3 is extended.
  • the output from the amplify circuit 6 increases and reaches a threshold level at which the state of PWM control signal is switched from the low-state to a high-state.
  • the switching device control circuit IC switches the PWM control signal into a high-state. Accordingly, the switching device 3 is switched into an off-state, and an output from the LC filter starts to decrease.
  • the output of the amplify circuit 6 continues to increase due to the response delay characteristics. Thereafter, the output of the LC filter decreases, but the level thereof remains to be higher than the threshold level resulting from amplification of the amplify circuit 6.
  • the switching device control circuit IC maintains the high-state of the PWM control signal for a while.
  • the output of the LC filter further decreases, and the output of the amplify circuit 6 reaches a level lower than the threshold level.
  • the switching device control circuit IC switches the PWM control signal into the low-state again, thereby brings the switching device 3 into the on-state.
  • the switching device 3 oscillates intermittently.
  • a waveform at a point V in Fig. 1 is like that shown in Fig. 2.
  • a switching frequency and a duty ratio thereof are 40 to 60 kHz and 10 to 20 percents, respectively. It should be noted that the present invention is not limited to the above values.
  • the switching device control circuit IC includes the oscillator as described above, and a frequency and a duty ratio of the waveform of Fig. 3 are 300 kHz and 10 to 20 percents, respectively, for example.
  • the output voltage at the LC filter (capacitor 4) is fed back to the switching device control circuit IC through the amplify circuit 6.
  • an output current from the LC filter (capacitor 4) may be fed back to the switching device control circuit IC through the amplify circuit 6. In both cases, it is possible to intermittently oscillate the switching device 3 utilizing the response delay characteristics of the amplify circuit 6.
  • Peltier device 1 is not limited to the configuration as shown in Fig. 4. Specifically, plural pairs of a P-channel semiconductor 1a and a N-channel semiconductor 1b may be arranged and connected in series.
  • the connecting portion 1c and discharge electrode 7 may be formed separately to each other, and an end portion of the discharge electrode 7 may be fixed to the connecting portion 1c.
  • the electrode 9 may be omitted.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Control Of Temperature (AREA)
EP10776192A 2009-09-25 2010-09-22 Cooling control circuit for peltier device Withdrawn EP2480946A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009221518 2009-09-25
PCT/JP2010/005742 WO2011036875A1 (en) 2009-09-25 2010-09-22 Cooling control circuit for peltier device

Publications (1)

Publication Number Publication Date
EP2480946A1 true EP2480946A1 (en) 2012-08-01

Family

ID=43271641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10776192A Withdrawn EP2480946A1 (en) 2009-09-25 2010-09-22 Cooling control circuit for peltier device

Country Status (6)

Country Link
US (1) US20120151939A1 (ja)
EP (1) EP2480946A1 (ja)
JP (1) JP2011091391A (ja)
CN (1) CN102483633A (ja)
TW (1) TW201126297A (ja)
WO (1) WO2011036875A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013098014A2 (en) * 2011-12-26 2013-07-04 Arcelik Anonim Sirketi Peltier element control circuit for household appliances
JP2014231933A (ja) * 2013-05-28 2014-12-11 パナソニック株式会社 冷却制御回路及びそれを備える静電霧化装置
JP6583905B2 (ja) * 2014-12-11 2019-10-02 学校法人 東洋大学 熱電素子駆動装置
US20220218514A1 (en) * 2019-05-14 2022-07-14 Verily Life Sciences Llc Ophthalmic devices, systems and methods for treating dry eye

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Also Published As

Publication number Publication date
CN102483633A (zh) 2012-05-30
JP2011091391A (ja) 2011-05-06
US20120151939A1 (en) 2012-06-21
WO2011036875A1 (en) 2011-03-31
TW201126297A (en) 2011-08-01

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