JPS63271054A - Ultrasonic wave humidifier - Google Patents

Abstract

PURPOSE:To provide an ultrasonic wave humidifier having a better response characteristic with a simple configuration by a method wherein a pseudo-AC applying means for alternatively applying a high-level or a low-level signal to both terminal ends of a humidity sensor and means for discriminating a humidity for receiving a humidity sensed signal of a humidity sensor and calculating a humidity are provided. CONSTITUTION:During a humidifying operation, a micro-computer 20 sets an out-port 0 to a high level and an out-port 1 to a low level so as to form a pseudo-power supply having a resistor R2 being + pole and a resistor R3 being-pole. A humidity sensing signal of a voltage level corresponding to a variation of resistance value of a humidity sensor RH is corrected for temperature by a variation in resistance value of a temperature correcting thermistor RT and applied to an inverted input terminal of a comparator 8. Out-ports 3, 4, 5, 6 and 7 are made to a low level in sequence and comparison voltages having different voltage levels appearing under each of combined resistances composed of each of resistors R4-R8 and a resistor R9 are added to a non-inverted inout terminal. The micro-computer 20 may judge humidity in response to an output level condition of each of the out ports 3, 4, 5, 6 and 7 when it detects an output level variation of the comparator 8 at an in-port.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement in an ultrasonic humidifier equipped with a humidity sensor.

(Prior Art) FIG. 3 is a block diagram of an ultrasonic humidifier, and this humidifier uses an AC generating circuit 1 to prevent electrolytic corrosion of the humidity sensor RH.

Specifically, a power transformer 3 is provided that connects an AC power supply 2 to a primary coil, and two of the power transformers 3
Rectifier circuit 4 consisting of a rectifier diode in the next coil
The AC generating circuit 1 is connected to the rectified output end of the rectifying circuit via a smoothing capacitor 5 and a resistor R1. A resistor R2 is placed on the AC generation side of this AC generation circuit 1.
, a temperature correction thermistor RT, the humidity sensor RH, and a resistor R3 are connected in series. There is a hole at the contact point between the temperature correction thermistor RT and the humidity sensor RH.
An inverting terminal (-side input terminal) of a comparator 8 is connected via a pulse follower circuit 6 and a rectifier diode 7, and an input (IN FORT) of a microcomputer 9 is connected to an output terminal of the comparator 8. Further, each of the resistors R4 to R8 of the comparison voltage generating circuit 10 is commonly connected to the non-inverting side input terminal (+ side input terminal) of the comparator 8, and is also connected to the DC power supply VOO via the resistor R9, and the other Each resistor R4 to R8 is connected to each out port (1, 2) of the micron viewer 9.
, 3, 4, 5). Note that 11 is a smoothing capacitor. With this configuration, an AC signal is applied from the AC generation circuit 1 to the humidity sensor RH, and a humidity detection signal with a temperature-corrected voltage level appears at the contact point between the humidity sensor RH and the temperature correction thermistor RT. The signal is applied to the inverting terminal of the comparator 8 through the voltage follower circuit 6 and the rectifier diode 7. At this time,
The microcomputer 9 has each out port (1, 2, 3
, 4, 5) are set to low level and high level sequentially. As a result, a comparison voltage whose voltage level changes sequentially is applied to the non-inverting terminal of the comparator 8, and when the voltage level applied to each input terminal of the comparator 8 is equal to or crosses the voltage level, the output level of the comparator 8 changes. When the microcomputer 9 receives a change in the output level of the comparator 8, it determines the humidity from the output level of each out port (1, 2, 3, 4, 5), and controls the humidifying operation according to this humidity.

However, as described above, since an AC signal is applied to the humidity sensor HR and its impedance change is detected, it is necessary to connect the Poldage follower circuit 6, the rectifier diode 7, and the smoothing capacitor 11, and also to connect the power transformer 3 and the rectifier. Circuit 4 and AC generating circuit 1 must be used. Therefore, the circuit configuration becomes complicated and the cost increases.

Furthermore, since the smoothing capacitor 11 is connected, there is a delay in the charging and discharging time of the capacitor 11 relative to the current humidity, resulting in poor responsiveness.

(Problems to be Solved by the Invention) As described above, the circuit configuration is complicated, and the current response to humidity is poor.

Therefore, an object of the present invention is to provide an ultrasonic humidifier with a simple configuration and good responsiveness.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an ultrasonic humidifier having a function of controlling humidifying operation according to humidity detected by a humidity sensor. This ultrasonic humidifier is equipped with a pseudo alternating current applying means that alternately applies high-level and low-level signals, and a humidity determining means that receives a humidity detection signal from a humidity sensor and determines the humidity. .

(Function) By providing such a means, high-level and low-level signals are applied alternately to both ends of the humidity sensor by the pseudo AC applying means, and at this time, the humidity determining means receives the humidity detection signal from the humidity sensor. to find the humidity.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same parts as in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a block diagram of an ultrasonic humidifier. A series circuit of resistor R2, temperature correction thermistor RT, humidity sensor RH, and resistor R3 is connected between seven OUT PORTs (0) (1) of microcomputer 120 (7). Further, the output terminal of the comparator 8 is connected to the input terminal of the microcomputer 20. on the other hand,
Each of the resistors R4 to R8 of the comparison voltage generating circuit 10 constituting the humidity determining means is connected to each output port t-(3, 4, 5, 6, 7") of the microcomputer 20. The microcomputer 20 detects It has the function of controlling an ultrasonic oscillation circuit (not shown) according to the indoor humidity, etc., and performing humidifying operation by the action of ultrasonic waves. It has the functions of a pseudo AC applying means that alternately applies level and low level signals, and a humidity determining means that receives a humidity detection signal from the humidity sensor RH and determines the humidity.

Next, the humidity detection function of the humidifier configured as described above will be explained with reference to the humidity detection flowchart shown in FIG. During the humidifying operation, the microcomputer 20 sets the out port (0) to a high level and sets the out port (1) to a low level in step S1. As a result, a pseudo power source is created in which the resistor R2 side is the "+" pole and the resistor R3 side is the "-" pole. At this time, a humidity detection signal having a voltage level corresponding to a change in the resistance value of the humidity sensor 6-RH is temperature-corrected by a change in the resistance value of the thermistor RT for temperature correction, and is applied to the inverting input terminal of the comparator 8. Next, in step S2, it is determined whether the outport (0) is at a high level and the outport (1) is at a low level, and the process proceeds to the next step S3.
, 5, 6, 7) are sequentially brought to low level. In other words, the out port (3) is set to low level and the other out port (
4, 5, 6, 7) are all set to high level, then only the out port (4) is set to low level, and all other out ports (3, 5, 6, 7) are set to high level. In this way, the out ports (3, 4, 5, 6, 7) are sequentially set to low level. As a result, each resistor R4 to R8 and the resistor R
Comparison voltages of different voltage levels appearing by each composite resistor consisting of 9 and 9 are applied to the non-inverting input terminal of comparator 8. Thus, when the comparison voltage reaches or rises to the level of the humidity detection signal, the output level of the comparator 8 changes from low level to high level. When the microcomputer 20 detects a change in the output level of the comparator 8 during inboarding, the microcomputer 20 determines the humidity from the output level state of each out port (3, 4, 5, 6, 7) at the time when the change in the output level is detected in step S4. do. Then, in step S5, it is determined whether a certain period of time has elapsed since the outport (0) was set to high level and the outport (1) was set to low level. is set to low level and the out port (1
) is set at a high level and the process moves on to the determination in step S2. Based on this determination, the process moves to step S7 to determine whether a certain period of time has elapsed, and when the certain period has elapsed, the process returns to step S1 again to set out port (0) to high level and set out port (1) to low level. Thus, step s3. s4 is executed again in the same manner as above to detect humidity.

In this way, in the above embodiment, high level and low level signals are applied alternately to both ends of the humidity sensor RH, and the humidity is determined by receiving the humidity detection signal from the humidity sensor RH. A voltage follower circuit, a rectifier circuit, and a smoothing capacitor are completely unnecessary, which simplifies the circuit configuration and reduces costs.Furthermore, since the smoothing capacitor is eliminated, responsiveness to humidity is improved.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, each out port (3, 4, 5) of the microcomputer 20
, 6, 7) may be changed to change the order in which the voltage levels of the comparison voltages change.

[Effects of the Invention] As described in detail above, according to the present invention, an ultrasonic humidifier with a simple configuration and good responsiveness can be provided.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of an ultrasonic humidifier according to the present invention, FIG. 2 is a humidity detection flowchart of the humidifier,
FIG. 3 is a block diagram of a conventional ultrasonic humidifier. 8... Comparator, 10... Comparison voltage creation circuit,
20...Microcomputer, R1-1...Humidity sensor, RT...Temperature correction thermistor. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2

Claims (1)

[Claims] In an ultrasonic humidifier having a function of controlling humidification operation according to humidity detected by a humidity sensor, pseudo AC applying means alternately applies high-level and low-level signals to both ends of the humidity sensor, respectively; 1. An ultrasonic humidifier comprising: humidity determination means for determining humidity by receiving a humidity detection signal from a humidity sensor.