JP2001072401A - Ozonizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozonizer capable of detecting abnormality of a secondary circuit of a step-up transformer for generating a high voltage and immediately stopping generation of ozone, having high safety. SOLUTION: In a first comparator circuit 21, a disconnection judging voltage is ccmpared with a DC output voltage of a tertiary coil for detection and the result is outputted to a logic circuit 25. In a second comparator circuit 22, an overload/short-circuit judging voltage is compared with a DC output voltage of a tertiary coil for detection and the result is outputted to the logic circuit 25. In the logic circuit 25, the occurrence of a disconnection and that of overload/short-circuit in the secondary circuit including an electrode plate for ozone generation are judged based on the comparative output of the first comparative circuit 21 and the second ccmparative circuit 22. A stop signal generating circuit 27 outputs an ozone generation stop signal based on the judge signal of the logic circuit 25 in the case of judging the occurrence of a disconnection and that of overload and short-circuit to stop operation of a switching signal generation circuit and to stop ozone generation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switching circuit for interrupting a current in a primary winding of a step-up transformer for generating a high voltage, generating a high voltage in a secondary winding, and applying the high voltage to an electrode for generating ozone. The present invention relates to an ozone generator that applies ozone to a plate to generate ozone.

[0002]

2. Description of the Related Art As shown in FIG. 4, a short circuit of an element constituting a primary side current switching circuit b of a high voltage generating step-up transformer a and a short circuit of a secondary side ozone generating electrode plate c are prevented. Secures the safety of the ozone generator by blowing the fuse e interposed in the power supply path d.

[0003]

However, since the performance of the fuse is affected by the temperature and the passing current, there is a problem that it is not easy to select an optimum fusing current value for the fuse to be used. Further, the above-described conventional ozone generation device cannot detect a disconnection of a secondary circuit (including an ozone generation electrode plate) of a high voltage generation step-up transformer or deterioration due to consumption of the ozone generation electrode plate. SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a highly safe ozone generation device that detects an abnormality in a secondary circuit of a high-voltage generation step-up transformer and immediately stops generation of ozone. It is intended to do so.

[0004]

In order to achieve the above object, the present invention provides an ozone generator, comprising the steps of interrupting the current of a primary winding of a high-voltage generating step-up transformer by a switching circuit to form a secondary winding. In an ozone generator for generating a high voltage and applying the high voltage to an ozone generating electrode plate to generate ozone, a detection tertiary winding provided in the high voltage generating step-up transformer; An AC / DC conversion circuit for converting an AC output generated in the tertiary winding into a DC output, and detecting an abnormality in the secondary circuit based on a correlation between the converted DC output voltage and a load on the secondary circuit. It is characterized by comprising a determining means for determining, and a secondary-side load determining circuit having a stop signal output means for outputting an ozone generation stop signal for stopping generation of ozone based on the abnormality determination of the determining means.

[Action and effect of the invention]

[0005] In the ozone generator of the above construction, an AC output generated in the tertiary winding for detection is converted into a DC output by an AC / DC conversion circuit, and a correlation between the converted DC output voltage and the load of the secondary circuit is provided. Based on the relationship, the determination means of the secondary-side load determination circuit determines abnormality of the secondary-side circuit. Then, the ozone generation is stopped by the ozone generation stop signal output from the stop signal output means in accordance with the abnormality determination of the determination means.
This ozone generator sets a predetermined determination voltage for the DC output voltage based on the correlation between the DC output voltage of the detection tertiary winding and the load of the secondary circuit, thereby providing a high voltage generation device. Abnormalities such as disconnection and short circuit of the electric wire connecting the secondary winding of the step-up transformer and the ozone generation electrode plate, internal short circuit of the ozone generation electrode plate, disconnection, and leakage due to external factors can be instantaneously determined, and ozone generation can be determined. Since it can be stopped, a highly safe ozone generator can be provided. Also,
As an incidental effect, deterioration due to consumption of the ozone generating electrode plate can be detected as a pseudo disconnection, and a short circuit or disconnection of the primary-side switching element can be detected.

[0006]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 is a block diagram of an ozone generator 1, FIG. 2 is a block diagram of a secondary load determining circuit of a step-up transformer for generating a high voltage (hereinafter simply referred to as a transformer), and FIG. 3 is a DC output voltage of a tertiary winding for detection. FIG. 7 is an explanatory diagram showing a correlation between the load of the secondary side circuit and the load of the secondary side circuit. The transformer 2 has one winding 2
a, a secondary winding 2b and a detection tertiary winding 2c. The detection tertiary winding 2 c is for detecting a magnetic flux in the transformer 2. The primary winding 2a is connected to a current switching circuit 3 including a switching element (not shown). The current switching circuit 3 is connected to a switching signal generation circuit 5 to which an ozone generation switch 4 is connected. The current switching circuit 3 and the switching signal generation circuit 5 are connected to a DC power supply circuit 8 by a connection line 7 having a fuse 6 interposed.

The secondary winding 2b of the transformer 2 is connected to the ozone generating electrode plate 9. Also, the detection tertiary winding 2
c is connected to the secondary-side load determination circuit 10 of the transformer 2. The secondary load determining circuit 10 includes a rectifier circuit 11 for converting an AC output into a DC (pulsating current) as shown in FIG.
An AC / DC conversion circuit 13 composed of a filter circuit 12 for smoothing the pulsating flow and converting it to a complete DC output,
It comprises a first comparison circuit 21, a second comparison circuit 22, a disconnection judgment voltage setting circuit 23, an overload / short circuit judgment voltage setting circuit 24, a logic circuit 25, a judgment time setting circuit 26, and a stop signal generation circuit 27.

[0008] The logic circuit 25 processes the outputs of the first comparison circuit 21 and the second comparison circuit 22 according to a predetermined processing program, and outputs a determination signal to the stop signal generation circuit 27. The determination time setting circuit 26 sets the time until the unstable state of the logic circuit 25 becomes stable immediately after the ozone generation switch 4 is turned on. Further, the stop signal generation circuit 27 outputs an ozone generation stop signal to the switching signal generation circuit 5 based on the processing signal.

When the ozone generation switch 4 is turned on, the current switching circuit 3 is driven by the switching signal from the switching signal generation circuit 5 and connected to the current switching circuit 3. The current of the primary winding 2a of the transformer 2 is interrupted. Thus, a high voltage required for generating ozone is generated in the secondary winding 2b, and the high voltage is applied to the ozone generating electrode plate 9 to generate ozone. At this time, 3
An AC output is generated in the secondary winding 2c. This AC output is converted into a DC output by an AC / DC conversion circuit 13 of a secondary-side load determination circuit 10 composed of a rectifier circuit 11 and a filter circuit 12, and is converted to a first comparison circuit 21 and a second comparison circuit 22, respectively. Is input to

In the first comparison circuit 21, the disconnection determination voltage V1 set by the disconnection determination voltage setting circuit 23 and the detection 3
The DC output voltage of the next winding 2c is compared, and the result is output to the logic circuit 25. In the second comparison circuit 22, the overload / short-circuit voltage set by the overload / short-circuit voltage setting circuit 24
The short-circuit determination voltage V2 is compared with the DC output voltage of the detection tertiary winding 2c, and the result is output to the logic circuit 25. In the logic circuit 25, after the time set by the determination time setting circuit 26 elapses, the secondary circuit including the ozone generation electrode plate 9 is disconnected based on the comparison output of the first comparison circuit 21 and the second comparison circuit 22. And whether an overload or short circuit has occurred. The stop signal generation circuit 27 outputs an ozone generation stop signal based on the determination signal of the logic circuit 25 when it is determined that a disconnection, overload or short circuit has occurred in the secondary circuit, and the switching signal generation circuit 5 Is stopped to stop the generation of ozone.

The correlation between the DC output voltage of the tertiary winding for detection used in the determination process of the logic circuit 25 and the load of the secondary side circuit is as shown in FIG. , Disconnection judgment voltage V1 and overload / short circuit judgment voltage V2
Are set, and the logic circuit 25 disconnects and short-circuits the electric wire connecting the secondary winding 2b of the transformer 2 and the ozone generation electrode plate 9 and the internal short-circuit, disconnection, and outside of the ozone generation electrode plate 9. Abnormalities such as leaks due to strategic factors can be instantaneously determined. Then, if it is determined that there is an abnormality, the ozone generation can be stopped immediately, so that a highly safe ozone generator can be provided. Further, as an incidental effect, deterioration due to consumption of the ozone generating electrode plate 9 can be detected as a pseudo disconnection, and the primary side current switching circuit 3 can be detected.
Short-circuit and disconnection of the switching element can be detected.

[Brief description of the drawings]

FIG. 1 is a block diagram of an ozone generator.

FIG. 2 is a block diagram of a secondary load determination circuit.

FIG. 3 is an explanatory diagram showing a correlation between a DC output voltage of a detection tertiary winding and a load of a secondary circuit.

FIG. 4 is a block diagram of a conventional ozone generator.

[Explanation of symbols]

 1. Ozone generator 2. Transformer 2a ... Primary winding 2b ... Secondary winding 2c ... Tertiary winding 3 .... Current switching circuit 9 .... Ozone generation Electrode plate 10 ... Secondary side load judgment circuit 13 ... AC / DC conversion circuit 25 ... Logic circuit 27 ... Stop signal generation circuit

Claims (1)

[Claims] A high voltage is generated in a secondary winding by interrupting a current in a primary winding of a step-up transformer for generating a high voltage by a switching circuit, and the high voltage is applied to an electrode plate for generating ozone. A tertiary winding for detection provided on the step-up transformer for generating high voltage, and an AC / DC converter circuit for converting an AC output generated in the tertiary winding for detection into a DC output. Determining means for determining an abnormality of the secondary circuit based on the correlation between the converted DC output voltage and the load of the secondary circuit; and ozone for stopping generation of ozone by the abnormality determination of the determining means. An ozone generator, comprising: a secondary-side load determination circuit having a stop signal output unit that outputs a generation stop signal.