KR20010088458A - Spray control circuit in humidifier - Google Patents

Abstract

PURPOSE: A spray control circuit for humidifier is provided to prevent damage to circuit components caused by over-voltage, and suppress power consumption. CONSTITUTION: A spray control circuit comprises a voltage distribution unit(R11,R12,R13) for distributing input voltage; an oscillator(TD11) for oscillating for spraying action; a driving unit(C11,C14,L11) driven by the output voltage from the voltage distribution unit, and which generates parallel oscillation voltage for oscillating the oscillator; and a voltage limiting unit for limiting the voltage which is output from the voltage distribution unit and applied to the driving unit. The voltage limiting unit includes a sensor for detecting the size of the input current; a Zener diode(ZD1) for generating turn-on current in accordance with the sensed value from the sensor and in proportion to the degree of excess of input voltage with respect to the rating value; and a mute unit(TR2,TR11) for muting the output from the voltage distribution unit in accordance with the turn-on current generated from the Zener diode.

Description

Spray control circuit in humidifier

The present invention relates to a spray control circuit of a humidifier, and more particularly, to a spray control circuit of a humidifier that can increase the reliability of the product by suppressing damage to circuit components and increased power consumption due to overvoltage.

The spray control circuit used in the conventional humidifier consists of only the structure which can control spray with respect to the voltage applied simply.

1 is a spray control circuit diagram used in a conventional humidifier.

In the conventional spray control circuit of the humidifier, as shown in FIG. 1, the bridge rectifier circuits D1 to D4 are connected to an AC power source applied from the outside, and between both output terminals of the rectifier circuits D1 to D4. The smoothing capacitor C6 is connected in parallel. Distribution resistors R1, R2, and R3 for distributing the voltage applied to the next stage of the capacitor C6 are connected in series.

The voltage divided by the resistors is used as a value for operating the transistor TR1 described later. The voltage distributed by the resistors R1, R2, and R3 is applied to the base terminal of the transistor TR1 through a filter consisting of an external variable resistor VR1, a capacitor C5, and a coil L3.

In addition, two resistors R4 and R5 are connected in series between the filter and the base terminal of the transistor TR1, and capacitors C2 and C3 are connected to both sides of the resistor R5 through connection points. The vibrator TD1 is connected between the capacitors C2 and C3. The connection point between the condenser C2 and the vibrator TD1 is connected to one output terminal of the rectifier circuits D1 to D4. The capacitor C4 is further connected to the connection point between the capacitor C3 and the vibrator TD1, and the other side of the capacitor C4 is connected to one output terminal of the rectifier circuits D1 to D4. It is connected to one side of the capacitor (C1).

The collector terminal of the transistor TR1 is connected to one output terminal of the rectifier circuits D1 to D4, and the emitter terminal is connected to the ground potential through two coils L1 and L2 connected in series.

Next will be described in detail the operation of the spray control circuit of the conventional humidifier having the above configuration.

The applied AC voltage is rectified in the rectifier circuits D1 to D4 and outputted, and the rectified voltage is smoothed in the capacitor C6. The smoothed voltage is divided by three resistors R1, R2, and R3 connected in series with the externally adjusted variable resistance VR1.

The noise component included in the divided voltage is removed from the filter composed of the coil C3 and the condenser C5.

In addition, the transistor TR1 is operated by a voltage applied to the base terminal, and in accordance with the operation of the transistor TR1, the oscillator TD1 of the resonant circuit connected in parallel oscillates and spraying is performed.

On the other hand, in order to control the spray amount, it is necessary to adjust the magnitude of the voltage applied to the base terminal of the transistor TR1. That is, the magnitude of the voltage applied to the base terminal of the transistor TR1 is determined by the values of the resistors R1, R2, and R3 connected in series and the resistance value of the external variable resistor VR1. The adjustment may change the degree of turn-on of the transistor TR1.

When a change occurs in the amount of current flowing through the transistor TR1, the spray amount is changed while the control amount of the vibrator TD1 is changed.

The spray control circuit of the conventional humidifier operated as described above has the following problems.

In the conventional spray control circuit of the humidifier, the base voltage of the transistor TR1 is determined after the voltage distribution is made by the resistance value which is simply determined for the input voltage. Of course, the resistance means a state in which the external variable resistor VR1 is constantly adjusted.

Therefore, when an overvoltage is applied due to a change in the input voltage, there is no method of controlling the amount of current applied to the base terminal of the transistor TR1. Therefore, in the conventional spray control circuit of the humidifier, when an overvoltage is applied, excessive current flows in the transistor TR1, which shortens the life of the component and increases the power consumption.

Furthermore, since the environment in which the humidifier is used is often nighttime rather than daytime, and typically the power value used at nighttime is smaller than daytime, the average power applied into the product is generally raised.

Therefore, in the spray control circuit of the conventional humidifier, since high power is applied to the input terminal, the voltage divided by the resistor itself becomes high. As a result, excessive current flows through the transistor TR1 due to the high voltage, and the reliability of the electronic component decreases due to continuous use, thereby causing a problem of product defects.

Accordingly, an object of the present invention is to provide a spray control circuit of a humidifier capable of controlling a stable voltage to be supplied to a vibrator even when overvoltage is applied.

1 is a spray control circuit diagram of a humidifier according to the prior art,

2 is a spray control circuit diagram of the humidifier according to the present invention.

Explanation of symbols on the main parts of the drawings

R11 ~ R18: Resistor V11: Variable Resistor

C11 ~ C19: Capacitor TR2, TR11: Transistor

TD11: Oscillator ZD1: Zener Diode

L11 ~ L13: Coil

Spray control circuit of the humidifier according to the present invention for achieving the above object, the voltage distribution means for distributing the input voltage by a predetermined; A vibrator oscillated for spray operation; Driving means driven by an output voltage of the voltage dividing means to generate a parallel resonance voltage for oscillation of the vibrator; And a voltage limiting means for constantly limiting the output voltage of the voltage dividing means applied to the driving means.

The voltage limiting means of the present invention includes: sensing means for sensing the magnitude of the input current; A zener diode which generates a turn-on current in proportion to the input voltage exceeding a rated value based on the sensed value of said sensing means; Control is performed by the turn-on current, and includes muting means for muting the output value of the voltage dividing means by a predetermined amount.

The mute means of the present invention is characterized by using a transistor.

The invention further comprises stabilizing means for suppressing input current instability of the driving means in accordance with the operation of the voltage limiting means.

The stabilization means of the present invention is characterized by using a capacitor.

Hereinafter, a spray control circuit of the humidifier according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a spray control circuit diagram of the humidifier according to the present invention.

As shown, the spray control circuit of the humidifier according to the present invention connects the bridge rectifier circuits D11 to D14 to an external AC power supply terminal to be applied. One output terminal of the bridge rectifying circuits D11 to D14 becomes a ground potential, and a fuse type resistor RF for suppressing overvoltage supply is connected to the output terminal side.

The next stage of the fuse-type resistor RF is a smoothing capacitor C16 connected between both output terminals of the bridge rectifier circuits D11 to D14. In the next stage of the capacitor C16, three series resistors R11, R12, and R13 for distributing the voltage applied in parallel with the capacitor C16 are connected. The resistors R11 and R13 are fixed resistors and the resistors R12 are variable resistors.

The voltage divided by the resistors is used as a value for operating the transistor TR11 described later. In addition, an external variable resistor VR11 for receiving a voltage divided by the resistors R11, R12, and R13 and adjusting it again by a predetermined amount is connected. The external variable resistor VR11 is a resistor that is exposed to the outside and whose resistance is variably adjusted by manual operation of a person.

On the other hand, a voltage limiting circuit portion for adjusting the applied voltage to a constant value is connected to the stage after the series connected resistors R11, R12, KR13. The voltage limiting circuit unit includes a resistor R16 connected to one output terminal of the bridge diodes D11 to D14, a zener diode ZD1 and a resistor R17 connected in series with the resistor. A condenser C18 is connected between the resistor R16 and the zener diode ZD1 to remove the pulsation between the ground and the ground potential so that a stable DC voltage is applied to the zener diode ZD1.

The voltage limiting circuit section includes a transistor TR2 for adjusting the amount of current flowing toward the external variable resistor TR11 to actually adjust the amount of current flowing toward the transistor TR1. The transistor TR2 connects a base terminal to a connection point between the zener diode ZD1 and the resistor R17. The emitter terminal of the transistor TR2 is connected to the ground potential through the resistor R18, and the collector terminal of the transistor TR2 is connected to one side of the external variable resistor VR11.

The other side of the external variable resistor VR11 is connected with a capacitor C19 for stabilizing the base current of the transistor TR11 during the operation of the transistor TR2. One side of the capacitor C19 is connected to the ground potential.

In this way, a voltage having a stable magnitude output from the voltage limiting circuit is applied to the base terminal of the transistor TR1 through a filter for removing noise. The filter is the next stage of the condenser C19, and includes a condenser C15 connected between one side of the variable resistor VR11 and the ground, and a coil L13 connected in series with the variable resistor VR11.

In addition, a protection resistor R14 is connected to the next stage of the filter in series with the coil L13 to consume back electromotive force induced in the coil. And connected in series with the protection resistor (R14), and includes a resistor (R15) for stabilizing the oscillation of the oscillator (TD11) to be described later.

The base terminal of the transistor TR11 is connected to the resistor R15. A neutralizing capacitor C13 is connected to the connection point between the two resistors R14 and R15 to prevent the high frequency from being fed back toward the base terminal of the transistor TR11. A coupling capacitor C12 is connected to the connection point between the resistor R15 and the transistor TR11. The vibrator TD11 is connected between the two capacitors C12 and C13. The connection point between the condenser C12 and the vibrator TD11 is connected to one output terminal of the rectifier circuits D1 to D4. A condenser C14 is further connected to a connection point between the condenser C13 and the vibrator TD11, and the other side of the condenser C14 is connected to an emitter terminal side of the transistor TR11. Is connected to.

A coupling capacitor C17 is connected between the base terminal and the emitter terminal of the transistor TR11. The collector terminal of the transistor TR11 is connected to one output terminal of the rectifier circuits D11 to D14, and the emitter terminal is connected to the ground potential through two coils L11 and L12 connected in series. A condenser C11 is connected between the two coils L12 and L13 and a connection point connected to the condenser C14 and one output terminal of the rectifier circuits D11 to D14.

That is, the oscillator TD11 oscillates and amplifies the two condensers C11 and C14 connected in parallel to both sides of the vibrator TD11 and the two condensers C11 and C14 are connected by a connection point. It is a parallel resonant circuit composed of a coil L1 connected to the emitter terminal side of a transistor TR11.

Next will be described in detail the operation process of the spray control circuit of the humidifier according to the present invention having the above configuration.

When the power is applied, the rectifier circuits D11 to D14 perform half-wave rectification to generate a DC voltage of a predetermined magnitude. The DC voltage rectified in the rectifier circuits D11 to D14 passes through the smoothing capacitor C16 to remove the pulse.

The voltage obtained by removing the pulse is divided by three resistors R11, R12, and R13 connected in series. The divided voltage is applied to the external variable resistor VR11.

On the other hand, when the voltage applied to the input terminal is an overvoltage, a change occurs in the amount of current flowing to the zener diode ZD1 through the resistor R16. The degree of turn-on of the transistor TR2 varies depending on the amount of current at this time. When the transistor TR2 is turned on, a predetermined amount of current flows from the current to be applied to the external variable resistor VR11 to the ground potential through the transistor TR2. The amount of current flowing to the ground potential is adjusted according to the amount of turn-on of the transistor TR2.

That is, the transistor TR2 is operated by sensing the amount of current flowing to the zener diode ZD1 through the resistor R16. According to the turn-on amount of the transistor TR2, a change occurs in the amount of current flowing through the transistor TR2 to the ground potential. In this way, it is possible to constantly adjust the current applied to the variable resistor VR11.

Therefore, the amount of current flowing through the zener diode ZD1 through the resistor R16 in the state where the rated voltage is applied should be set to an amount that does not turn on the transistor TR2. On the contrary, the amount of current flowing through the resistor R16 through the zener diode ZD1 should be set to a state in which the amount of turn-on of the transistor TR2 can be increased in proportion to the degree of exceeding the rated voltage. In this way, the overvoltage by exceeding the rated voltage is muted to ground.

In this way, the voltage applied to the variable resistor VR11 is constantly adjusted, and the voltage is applied to the base terminal of the transistor TR11 by removing the noise signal from the filter in which the coil L13 is composed of the capacitor C15. . When the transistor TR2 is operated, the capacitor C19 suppresses the instability of the base current of the transistor TR11.

When the transistor TR11 is supplied with a constant voltage and repeats the turn-on operation and the turn-off operation, the oscillator TD11 is oscillated by the resonance voltage of the capacitors C11 and C14 and the coil L1. Spraying is performed while this is being done.

As described above, the present invention has a basic technical idea to adjust the turn-on voltage of the transistor TR11 to oscillate the oscillator TD11 even when the power supply voltage fluctuates due to overvoltage. .

And within the scope of the technical idea of the present invention, of course, various modifications are possible to those skilled in the art.

The present invention described above has the following effects.

First, when an overvoltage is applied, the amount exceeding the rated voltage is muted to ground, thereby preventing damage to the electronic components (transistor TR11, vibrator TD11) due to overvoltage.

Second, by suppressing the increase in the power consumption according to the amount of change in the power supply voltage (overvoltage), there is an advantage that can increase the efficiency of power use.

Third, since the shortening of the lifespan of the electronic component due to the conventional overvoltage is prevented, it is possible to obtain the reliability of the product while extending the life of the product.

Claims (5)

Voltage distribution means for distributing the input voltage by a predetermined amount; A vibrator oscillated for spray operation; Driving means driven by an output voltage of the voltage dividing means to generate a parallel resonance voltage for oscillation of the vibrator; And a voltage limiting means for constantly limiting an output voltage of the voltage dividing means applied to the driving means. The method of claim 1, The voltage limiting means includes: sensing means for sensing a magnitude of an input current; A zener diode which generates a turn-on current in proportion to the input voltage exceeding a rated value based on the sensed value of said sensing means; And a muting means for controlling by the turn-on current to mute the output value of the voltage dividing means by a predetermined amount. The method of claim 2, The mute means, the spray control circuit of the humidifier, characterized in that using a transistor. The method according to any one of claims 1 to 3, And a stabilizing means for suppressing an input current instability of the driving means according to the operation of the voltage limiting means. The method of claim 4, wherein The stabilization means, the spray control circuit of the humidifier, characterized in that using a condenser.