JPH1064691A - Direct current static eliminator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC static eliminator using a plus-minus voltage double rectifier circuit, with which it is possible to make delicate ion balance adjustment through prevention of excessive increase of the ion generating amount on the plus side and to prevent breakage of a high frequency oscillator circuit or the like caused by DC component of high voltage. SOLUTION: One of the input ends on the primary side of a high frequency transformer 5 is connected with one of the output ends on the secondary side so that a ground line 12 is established leading from one input end of a high frequency oscillator circuit 6 to one input end of a plus side voltage double rectifier circuit 2A and a minus side voltage double rectifier circuit 2B. In case the number of amplifying steps of the circuit 2A is made greater than that of the circuit 2B, a variable resistance 19 is connected between one input end of the circuit 2A and the ground line 12, and adjustment to lower side is made by this resistance 19 in the amount corresponding to the excess of the plus side output voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct current static eliminator having an ion balance function for generating positive and negative high voltages separately and for equalizing the amount of positive and negative ions generated.

[0002]

2. Description of the Related Art Conventionally, as such a DC neutralization device,
For example, there are the followings. SUMMARY OF THE INVENTION The positive and negative discharge electrodes are connected to the transformers of the positive and negative high voltage generating circuits, and the ground terminal of the secondary coil of the positive and negative transformers is grounded via an external grounding resistor. Among the currents flowing when the electrodes are discharged, the difference between the positive-side effective static elimination current and the negative-side effective static elimination current that generates ions contributing to static elimination is detected by the voltage generated in the external grounding resistor, and the difference changes over time. The rate of change and the temporal change rate of the positive-side high voltage and the negative-side high voltage are determined, and one of the positive and negative effective static elimination current values is determined from the two kinds of temporal change rates using a constant relational expression. From this, the other effective static elimination current value is also determined based on this, and the positive and negative high voltage generation circuits are repeatedly and minutely controlled so that the positive and negative high voltages are totally reduced so that the obtained effective static elimination current value matches the set value. Gently By increasing or decreasing, the ion balance is controlled.

[0003] A positive electrode and a negative electrode, a high-frequency transformer, a high-frequency oscillator circuit connected to the primary side of the high-frequency transformer and self-excited by a DC voltage, and a high-frequency transformer A positive side voltage doubler rectifier circuit in which a diode and a capacitor are connected in multiple stages between the secondary side and the positive side discharge electrode, and a diode and capacitor are connected in multiple stages between the secondary side and the negative side discharge electrode of the high frequency transformer. It has a negative voltage doubler rectifier circuit connected to it. Generally, the amount of negative ions generated tends to be larger than that of positive ions. The number of amplification stages is increased by one to achieve ion balance.

[0004]

In the prior art, however, delicate control is possible. However, in addition to the hardware, a high voltage generating circuit including a transformer for each of positive and negative is required, and various detecting means and various detecting means are required. A control circuit, an arithmetic circuit, and the like are required, so that the entire circuit configuration becomes very complicated, and a control algorithm is also very complicated and expensive in software.

The conventional example has an advantage that it can be provided at a much lower cost than the conventional example because the configuration is simple and the size can be reduced and no complicated control circuit or the like is required.
Due to the difference in the number of amplification stages between the positive side voltage doubler rectifier circuit and the negative side voltage doubler rectifier circuit, only the positive and negative high voltages have a difference (the positive side is higher than the negative side), so the voltage difference However, there is a problem that the amount of ions generated on the plus side is excessively increased, and fine ion balance adjustment cannot be performed. In addition, the charging potential of the charged object is induced as a high-voltage DC component by the positive and negative discharge electrodes,
If it penetrates a high-frequency transformer and enters a high-frequency oscillation circuit or the like, the high-frequency oscillation circuit or the like may be broken.

An object of the present invention is to improve the above-mentioned conventional example to solve the disadvantage while maintaining its advantages, that is, to prevent an excessive increase in the amount of ion generation on the plus side and to achieve a fine ion balance. Enabling adjustment,
An object of the present invention is to prevent a high-frequency oscillation circuit or the like from being damaged by a high-voltage DC component.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a high-frequency oscillator, a high-frequency transformer, a high-frequency oscillation circuit connected to the primary side of the high-frequency transformer, and self-excited by a DC voltage. A positive side voltage doubler rectifier circuit in which a diode and a capacitor are connected in multiple stages between the secondary side of the transformer and the positive side discharge electrode, and a diode and a capacitor between the secondary side and the negative side discharge electrode of the high frequency transformer. And a multi-stage connected negative side voltage doubler rectifier circuit, characterized in that the following first or second mode is adopted.

In a first embodiment, one input terminal on the primary side of a high-frequency transformer is connected to one output terminal on the secondary side, and a positive-side voltage doubler rectifier circuit and Forming a ground line to one input terminal of the negative side voltage doubler rectifier circuit, increasing the number of amplification stages of the positive side voltage doubler rectifier circuit more than that of the negative side voltage doubler rectifier circuit, positive side voltage doubler rectification A variable resistor is connected between one input terminal of the circuit and the ground line.

According to such a configuration, the charged potential of the charged object is induced as a high voltage DC component by the plus / minus discharge electrodes, and even if it passes through the high frequency transformer, it is allowed to escape from the ground line to the ground. it can. If the number of amplification stages of the positive side voltage doubler rectifier is made larger than that of the negative side voltage doubler rectifier, the amount of ion generation on the positive side becomes too large. By appropriately lowering the resistance by resistance, fine ion balance adjustment can be performed.

In a second embodiment, one input terminal on the primary side of a high-frequency transformer is connected to one output terminal on the secondary side, and a positive-side voltage doubler rectifier circuit is connected from one input terminal of the high-frequency oscillation circuit. Forming a ground line to one input terminal of the negative side voltage doubler rectifier circuit, equalizing the number of amplification stages of the positive side voltage doubler rectifier circuit and the number of negative side voltage doubler rectifier circuits, negative side voltage doubler A variable resistor is connected between one input terminal of the rectifier circuit and the ground line.

According to such a configuration, the charged potential of the charged object is induced as a high-voltage DC component to the plus / minus discharge electrodes, and even if it passes through the high-frequency transformer, it is allowed to escape from the ground line to the ground. it can. When the number of amplification stages of the positive side voltage doubler rectifier circuit and the number of amplification stages of the negative side voltage doubler rectifier circuit are the same, the amount of ion generation on the negative side tends to increase, but the voltage of the negative side voltage doubler rectifier circuit is changed by a variable resistor. , The ion balance can be finely adjusted.

[0012]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. This DC static eliminator is mainly composed of a high frequency oscillating unit 1 which continuously or intermittently oscillates a high frequency, and a plus / minus output from its high frequency output.
It comprises a voltage doubler rectifier 2 for generating each negative DC high voltage, and positive and negative discharge electrodes 3A and 3B to which the positive and negative high voltages are applied.

The high-frequency oscillation unit 1 includes a constant voltage circuit 4 for converting a voltage from an external power supply to a constant DC voltage, and a high-frequency transformer 5 which oscillates continuously or intermittently with the constant DC voltage and continuously or intermittently oscillates. A high-frequency oscillating circuit 6 for continuously or intermittently outputting a high-frequency high voltage to the secondary side, and an operation display circuit 8 for displaying the oscillating operation by lighting a light-emitting diode 7
It is composed of

One end of the primary coil 5a of the high-frequency transformer 5 and one end of the secondary coil 5b are connected to each other, and one end of the primary coil 5a is connected to the input-side ground terminal 9 of the high-frequency oscillator 1 and to the secondary side. One end of the coil 5b is connected to the output-side ground terminal 10 of the high-frequency oscillating unit 1, and the output-side ground terminal 10 is also connected to the input-side ground terminal 11 of the voltage doubler rectifier 2. A ground line 12 is formed from one input-side ground terminal 9 to the input-side ground terminal 11 of the voltage doubler rectifier 2. The polarity and magnitude of the potential of the high-frequency oscillator 1 and the voltage doubler rectifier 2 are determined based on the ground line 12.

A voltage output terminal 13 of the high-frequency oscillator 1 is connected to a voltage input terminal 14 of the voltage doubler rectifier 2, and a high-frequency high voltage from the secondary coil 5 b of the high-frequency transformer 5 is applied to these terminals 13. The voltage is applied to the voltage doubler rectifier 2 through 14.

The voltage doubler rectifier 2 comprises a plus voltage doubler rectifier circuit 2A and a negative voltage doubler rectifier circuit 2B connected in parallel to the ground terminal 11 and the voltage input terminal 14. The voltage doubler rectifier circuits 2A and 2B are each connected in a manner that a diode D and a capacitor C are stacked in series, so that a high voltage DC voltage that is a multiple of the secondary voltage of the high frequency transformer 5 can be obtained by the number of stacked layers. .
In the first embodiment, in order to increase the voltage on the plus side,
The number of amplification stages of the plus-side voltage doubler rectifier circuit 2A is increased by one compared with the minus-side voltage doubler rectifier circuit 2B. The output terminals of the plus / minus voltage doubler rectifier circuits 2A and 2B are connected to the plus / minus output terminals 15 of the voltage doubler rectifier 2.
A.15B. The positive and negative output terminals 15A and 15B are connected to the discharge electrodes 3A and 3B by resistance, respectively.
Discharge electrode 2 through minus 16A and 16B separately
A.2B.

The input terminals of the voltage doubler rectifier 2 are provided with volume terminals 17 and 18, and a variable resistor 19 is connected between the terminals 17 and 18. One input terminal of the positive-side voltage doubler rectifier circuit 2A is connected to a voltage input terminal 14 of the voltage doubler rectifier 2, while the other input terminal is connected to a volume terminal 17 and a volume terminal 18 ,
It is connected to the input-side ground terminal 11 of the voltage doubler rectifier circuit 2. Therefore, the other input terminal of the positive side voltage doubler rectifier circuit 2 </ b> A is connected to the ground line 12 via the variable resistor 19. On the other hand, one input terminal of the negative-side voltage doubler rectifier circuit 2B is connected to the voltage input terminal 14 of the voltage doubler rectifier 2, while the other input terminal is connected to the variable resistor 1
9 is connected to the ground line 12 without passing through.

In the configuration shown in FIG. 1, the number of amplification stages of the plus side voltage doubler rectifier circuit 2A is one more than that of the minus side voltage doubler rectifier circuit 2B.
The output voltage of B is higher on the plus side by one stage than the number of amplification stages. If the amount of ions generated by the discharge from the plus and minus discharge electrodes 3A and 3B becomes equal only by the determined voltage difference, the adjustment by the variable resistor 19 is unnecessary,
Since the plus side is made too high to win, if the output voltage on the plus side is adjusted to be low by the variable resistor 19 by the excess, the ion balance accuracy of plus and minus is improved.

Since both the positive side voltage doubler rectifier circuit 2A and the negative side voltage doubler rectifier circuit 2B are connected to the input side ground terminal 9 of the high-frequency oscillator 1 through the ground line 12, these voltage doubler rectifier circuits 2A and 2B Even if a high-voltage DC component from the power supply penetrates the high-frequency transformer 5 and enters the primary side thereof, it can escape to the ground, so that various circuit elements in the high-frequency oscillator 1 can be prevented from being destroyed.

Next, the second embodiment shown in FIG.
The number of amplification stages of the negative voltage doubler rectifier circuits 2A and 2B is the same, and the other input terminal of the negative voltage doubler rectifier circuit 2B is connected to the ground line 12 via the variable resistor 19;
By making the output voltage of the negative side voltage doubler rectifier circuit 2B lower than the positive side by the amount adjusted by the variable resistor 19, fine ion balance adjustment is enabled.

[0022]

As described above, according to the present invention, the charging potential of the charged object is induced as a high voltage DC component by the plus / minus discharge electrodes, and even if it penetrates the high frequency transformer, the ground line is applied. From the ground to the ground, so that the high-frequency oscillation circuit and the like can be prevented from being broken. Further, only by varying the output voltage of the positive or negative voltage doubler rectifier circuit with a variable resistor, fine ion balance adjustment is possible, and the ion balance accuracy can be easily improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High frequency oscillation part 2 Double voltage rectification part 2A Positive side voltage doubler rectifier circuit 2B Minus side voltage doubler rectifier circuit 3A Positive side discharge electrode 3B Minus side discharge electrode 4 Constant voltage circuit 5 High frequency transformer 6 High frequency oscillator circuit 19 Variable resistance C Capacitor D diode

Claims (2)

[Claims] 1. A high-frequency transformer, a high-frequency transformer, a high-frequency oscillation circuit connected to a primary side of the high-frequency transformer and self-excited by a DC voltage, and a secondary and a positive side of the high-frequency transformer The positive side voltage doubler rectifier circuit in which a diode and a capacitor are connected in multiple stages between the discharge electrodes and the negative side voltage in which a diode and a capacitor are connected in multiple stages between the secondary side and the negative side discharge electrode of a high-frequency transformer A DC rectifier circuit having a voltage rectifier circuit, wherein one input terminal on the primary side of the high-frequency transformer and one output terminal on the secondary side are connected to each other, and a positive input is supplied from one input terminal of the high-frequency oscillation circuit. A ground line leading to one input terminal of the voltage rectifier circuit and the negative side voltage doubler rectifier circuit is formed. It has more than amplification stages of the voltage rectifier circuit, a DC static eliminator, characterized by connecting a variable resistor between the one input terminal of the positive-side voltage doubler rectifier circuit and the ground line. 2. A high-frequency transformer, a high-frequency transformer, a high-frequency oscillation circuit connected to a primary side of the high-frequency transformer and self-excited by a DC voltage, and a secondary and a positive side of the high-frequency transformer. The positive side voltage doubler rectifier circuit in which a diode and a capacitor are connected in multiple stages between the discharge electrodes and the negative side voltage in which a diode and a capacitor are connected in multiple stages between the secondary side and the negative side discharge electrode of a high-frequency transformer A DC rectifier circuit having a voltage rectifier circuit, wherein one input terminal on the primary side of the high-frequency transformer and one output terminal on the secondary side are connected to each other, and a positive input is supplied from one input terminal of the high-frequency oscillation circuit. Forming a ground line to one input terminal of the voltage rectifier circuit and the negative side voltage doubler rectifier circuit; It has an amplifying stages of the voltage rectifier circuit in the same DC neutralization apparatus characterized by connecting a variable resistor between the one input terminal of the negative side voltage doubler rectifier circuit and the ground line.