KR101238035B1 - Variable high voltage module for corona discharge - Google Patents

Abstract

According to the present invention, a voltage of a high voltage that causes corona discharge can be applied to the discharge needle in a variable manner so that the high voltage current is optimal for the discharge needle according to the electrostatic charging state of the object to be static discharged. The present invention relates to a variable high voltage module for corona discharge, which improves the discharge efficiency by increasing the discharge efficiency by increasing the time constant of the voltage causing the discharge by applying only to generate the required amount of ions.
The variable high voltage module for corona discharge of the present invention includes a constant voltage circuit 11 for converting an input voltage of DC18V to 26.4V into a DC10V output voltage, and an oscillation circuit for oscillating a DC voltage output from the constant voltage circuit 11 into a 75 kHz square wave. 12, a pulse width comparison circuit 13 for comparing the pulse widths so that the output voltage is kept constant, and delivering a 75 kHz waveform in which the piezoelectric transformer vibrates on and off alternately by the frequency of the low frequency PWM. Power driving circuit 14, a power (voltage) boosting circuit 15 for boosting the piezoelectric transformer input voltage using a small transformer, and a power (current) amplifying circuit 16 for amplifying the piezoelectric transformer input current using a FET. The piezoelectric transformer 10 boosts the power input from the power (current) amplifying circuit 16 to a high voltage and outputs the discharge needle to the discharge needle, and checks whether the output voltage and frequency of the piezoelectric transformer are constant. In the high voltage module for corona discharge comprising an oscillation negative feedback circuit (17) for sending a signal to the oscillation circuit (12), the pulse width comparison circuit (13) is adjusted to a pulse width by a voltage or a resistance value to the piezoelectric transformer. Output voltage adjusting circuit 20 for changing the output voltage value of 10 and the high output voltage of the piezoelectric transformer 10 to low voltage so that the user can monitor the output voltage of the piezoelectric transformer 10. It characterized in that it comprises a DC sensing circuit (21).

Description

Variable high voltage module for corona discharge {Variable high voltage module for corona discharge}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high voltage module for generating a high voltage current applied to a discharge needle causing corona discharge, and more particularly, to varying the voltage of the high voltage current causing corona discharge. It can be applied to the discharge needle by applying the optimal high-voltage current to the discharge needle according to the electrostatic charging state of the object to be discharged to generate only the required amount of ions to improve the static elimination efficiency In addition, the present invention relates to a variable high voltage module for corona discharge that increases the discharge efficiency by accelerating the time constant of the voltage causing the discharge.

In general, various electronic components such as semiconductors, LCDs, and copiers naturally generate static electricity during their production. In addition, static electricity is generated by various factors such as friction in the production process not only in electronic products but also in all industries such as textiles and machinery. If such static electricity occurs, it may cause product malfunction or instability of performance, and it is preferable to remove static electricity because it affects the human body. However, even if the static electricity charged in the product or parts is removed by a conventional method such as a brush, all of the static electricity is not removed and there are many residual static electricity.

In order to remove the remaining static electricity remaining in the product or parts as described above, as shown in Figure 1, such as ion blower (ion blower) that generates positive and negative ions and blows these ions to the charging object to remove the static electricity It is used in the static elimination device.

Electrostatic eliminating device is a discharge needle (2) for generating positive and negative ions by corona discharge by applying a high voltage of (+) or (-), the discharge needle frame (4) to insulate and install the discharge needle (2), It is composed of a drive motor (3) and a blade (3a) installed at the rear of the discharge needle (2) to blow wind toward the charging object from behind the ions generated by the discharge needle (2).

The positive and negative ions are generated by corona discharge. Corona discharge is a form of discharge in the gas. When one or both electrodes are pointed, the electric field at the pole becomes strong and discharge occurs. When voltage is applied, positive ions are generated. When negative voltage is applied, negative ions are generated.

However, since the conventional static elimination device is to apply a constant high voltage to the discharge needle, the amount of ions cannot be arbitrarily controlled, and accordingly, the amount of ions cannot be provided according to the strength of the charged static electricity. there was.

For example, a large amount of ions is required when the intensity of charged static electricity is large, but when a small amount of ions are brought into contact with the charged body, a complete static charge is not achieved. In the case of weakness, although a smaller amount of ions are required, when an excessive amount of ions is provided, a phenomenon in which static electricity is newly charged due to the excessively provided ions occurs.

Accordingly, the amount of ions supplied for the static elimination of the charged object is preferably varied to supply as many ions as necessary for efficient static elimination, but in the related art, only a certain amount of ions are provided to provide an effective static elimination. There was no problem.

In addition, the voltage applied to the discharge needle (2) is a sine wave voltage (sine wave) so that the time constant (time constant) to the level that causes the discharge in the discharge needle (2) is a problem that the discharge efficiency is low as much There was this.

The present invention has been made to solve the problems of the conventional high voltage module for corona discharge as described above, the object of the present invention is to allow the voltage of the high voltage current causing the corona discharge to be applied to the discharge needle variably object It is to provide a variable high voltage module for corona discharge to improve the efficiency of the electrostatic discharge by applying the optimum high voltage current to the discharge needle according to the electrostatic charging state of the to generate only the required amount of ions.

Another object of the present invention is to provide a variable high voltage module for high pressure discharge for increasing the discharge efficiency by speeding up the time constant to reach a high voltage causing the discharge.

Corona discharge variable high voltage module of the present invention for achieving the above object is a constant voltage circuit for converting an input voltage of DC18V ~ 26.4V into a DC10V output voltage, the oscillating circuit oscillating the DC voltage output from the constant voltage circuit with a 75kHz square wave Pulse width comparison circuit that compares pulse width to keep output voltage constant, power drive circuit that delivers 75kHz waveform with periodic piezoelectric vibration on / off and on time, piezoelectric transformer input using small transformer A power (voltage) booster circuit that boosts voltage, a power (current) amplifier circuit that amplifies the piezoelectric transformer input current using a FET, and boosts the power input from the power (current) amplifier circuit to a high voltage and outputs it to the discharge needle. The piezoelectric transformer and the output voltage and frequency of the piezoelectric transformer to check whether A high voltage module for corona discharge comprising an oscillating negative feedback circuit, comprising: an output voltage adjusting circuit for changing an output voltage value of the piezoelectric transformer by adjusting a pulse width to a voltage or a resistance value in the pulse width comparison circuit; It includes a DC sensing circuit that converts the high output voltage of the transformer to a low voltage to enable the user to monitor the output voltage of the piezoelectric transformer.

The variable high voltage module for corona discharge of the present invention is further characterized in that the output voltage adjusting circuit adjusts the output voltage value of the piezoelectric transformer to a voltage of 75 kHz sine wave 5 to 10 kV.

In the variable high voltage module for corona discharge of the present invention, two high voltage circuits each consisting of all the above circuits are connected in parallel, and a low frequency PWM is generated by adjusting a resistance value so that the power driving circuits of the two high voltage circuits are controlled. A PWM controller that alternately turns on / off by the frequency of the low frequency PWM and a piezoelectric transformer of each of the high voltage circuits are connected in parallel, and the final output voltage is converted into a variable low frequency push wave 5 to 10 kV voltage. And a push wave generation circuit.

The variable high voltage module for corona discharge according to the present invention is capable of variably changing the voltage output from the piezoelectric transformer in order to cause corona discharge from the discharge needle. High voltage can be applied, thereby maximizing the efficiency of the static electricity by generating only the required amount of ions by the corona discharge in the discharge needle.

The present invention can also control the time constant to reach the high voltage causing the discharge by the discharge needle by connecting the two high-voltage circuit in parallel so that the final output voltage is a variable low frequency push wave voltage, thereby improving the discharge efficiency It can increase.

1 is a configuration diagram of an ion blower generally used for removing static electricity,
2 is a block diagram of a high voltage module for corona discharge according to the first embodiment of the present invention,
3 is a block diagram of a high voltage module for corona discharge according to a second embodiment of the present invention,
Figure 4a is a waveform diagram of the output voltage of the high voltage module for corona discharge according to the first embodiment of the present invention,
Figure 4b is a waveform diagram of the output voltage of the high voltage module for corona discharge according to the second embodiment of the present invention.

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

As shown in Figure 2, the variable high voltage module for corona discharge of the present invention is a piezoelectric transformer 10, constant voltage circuit 11, oscillation circuit 12, pulse width comparison circuit 13, power It consists of a high voltage circuit including a drive circuit 14, a power (voltage) boost circuit 15, a power (current) amplifier circuit 16, and an oscillation negative feedback circuit 17.

The constant voltage circuit 11 is a circuit for converting an input voltage of DC18V to 26.4V into a DC10V output voltage, and the oscillator circuit 12 is a circuit for oscillating the DC voltage output from the constant voltage circuit with a 75 kHz square wave, and a pulse width comparison circuit. Reference numeral 13 denotes a circuit for checking whether the pulse width is constant so that the output voltage is kept constant and controlling the constant.

The power drive circuit 14 is a circuit for periodically turning on / off and delivering a 75 kHz waveform at which the piezoelectric transformer 10 vibrates at an on time, and the power (voltage) booster circuit 15 is a small transformer. It is a circuit for boosting the input voltage to the piezoelectric transformer 10 by using, the power (current) amplifier circuit 16 is a circuit for amplifying the input current to the piezoelectric transformer 10 by using a field effect transistor (FET). The power driving circuit 14, the power (voltage) boosting circuit 15, and the power (current) amplifying circuit 16 may be referred to as one amplification circuit.

The piezoelectric transformer 10 uses a mechanical vibration as a kind of transformer that boosts the electric power input from the electric power (current) amplifying circuit 16 to a high voltage and applies it to a discharge needle causing corona discharge.

The oscillation negative feedback circuit 17 checks whether the output voltage and frequency of the piezoelectric transformer 10 are constant and sends the information to the oscillation circuit.

The high voltage module for corona discharge of the present invention varies the output voltage of the piezoelectric transformer 10 so as to output an optimum optimal voltage according to the electrostatic charging state of the charging object, and an output voltage adjusting circuit 20 and a DC sensing circuit 21. ) Is further provided. The output voltage adjusting circuit 20 is a circuit for changing the output voltage value of the piezoelectric transformer 10 by adjusting the pulse width to the pulse width comparison circuit 13 by a voltage or a resistance value.
The DC sensing circuit 21 converts the high output voltage (5 to 10 kV) of the piezoelectric transformer 10 into a low voltage (0 to 5 V) so that the user can monitor the output voltage of the piezoelectric transformer 10. It is a circuit that enables. That is, the piezoelectric transformer 10 adjusts the voltage and resistance of the output voltage adjusting circuit 20 while monitoring the output voltage value of the pressure transformer 10 by a monitor outputting the signal from the DC sensing circuit 21. Adjust the output voltage.

The output voltage adjusting circuit 20 can adjust the output voltage value of the piezoelectric transformer 10 to a voltage of 75 kHz sine wave 5-10 kV. That is, the piezoelectric transformer 10 outputs a voltage capable of optimally removing the static electricity according to the electrostatic charging state of the charging object in the range of 5 to 10 kV. In this embodiment, the waveform of the voltage output from the piezoelectric transformer 10 is a sine wave as shown in Fig. 4A.

In the variable high voltage module for corona discharge according to another embodiment of the present invention, as shown in FIG. 3, two high voltage circuits (x) (x ') each consisting of all the circuits are connected in parallel, and two high voltages are connected. A pulse width modulation controller (PWM) 30 is connected in parallel to the power driving circuit of the circuit (x) (x '), and the piezoelectric transformers 10 and 10 of the two high voltage circuits (x) (x') are connected in parallel. The push wave generation circuit 31 is connected in parallel.

The PWM controller 30 generates a low frequency PWM signal by adjusting a resistance value so that the power drive circuits 14 of the two high voltage circuits (x) (x ') are alternately turned on / off by the frequency of the low frequency PWM. The push wave generation circuit 31 connects the piezoelectric transformers 10 of the high voltage circuits x and x 'in parallel and converts the final output voltage to be a variable low frequency push wave 5 to 10 kV voltage.

The high voltage module of this embodiment allows the waveform to be a push wave as shown in FIG. 4B while simultaneously converting the frequency while the output voltage of the piezoelectric transformer 10 is varied in the range of 5 to 10 kV.

The variable high voltage module for corona discharge according to the present invention is applied by the piezoelectric transformer 10 to the discharge needle causing the corona discharge, and can be variably changed while monitoring the applied voltage by a signal from the DC sensing circuit 21. . Therefore, the optimum high voltage current can be applied to the discharge needle according to the electrostatic charging state of the object to be discharged. Therefore, only the required amount of ions are generated in the discharge needle that causes the corona discharge and blown to the charging object to maximize the static discharge efficiency. Can be. Therefore, according to the present invention, it is possible to completely remove or minimize the residual static electricity in the charged object.

The present invention also allows two high-voltage circuits (x) (x ') to be connected in parallel so that the final output voltage becomes a variable low frequency push wave voltage to quickly control the time constant reaching the high voltage causing the discharge in the discharge needle. You can. Accordingly, the discharge efficiency can be increased.

 Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various changes or modifications can be made within the spirit and scope of the invention, and such changes or modifications are consequently claimed. It will have to belong to the scope of.

2: discharge needle 3: driving motor
3a: wing 4: needle frame
10 piezoelectric transformer 11 constant voltage circuit
12: oscillation circuit 13: pulse width comparison circuit
14: power driving circuit 15: power (voltage) boost circuit
16: power (current) amplifier circuit 17: oscillator feedback circuit
20: output voltage adjusting circuit 21: DC sensing circuit
30: PWM controller 31: Pushing wave generation circuit

Claims (3)

A constant voltage circuit 11 for converting an input voltage of DC 18 V to 26.4 V into a DC 10 V output voltage, an oscillation circuit 12 for oscillating a DC voltage output from the constant voltage circuit 11 into a 75 kHz square wave, so that the output voltage is kept constant The pulse width comparison circuit 13 for comparing the pulse widths, the power drive circuit 14 for transmitting the frequency 75 kHz waveform in which the piezoelectric transformer oscillates on and off alternately by the frequency of the low frequency PWM, and a small transformer are used. A power (voltage) booster circuit 15 for boosting the piezoelectric transformer input voltage, a power (current) amplifier circuit 16 for amplifying the piezoelectric transformer input current using a FET, and the power (current) amplifier circuit 16. The piezoelectric transformer 10 which boosts the power input from the high voltage to the discharge needle, and checks whether the output voltage and frequency of the piezoelectric transformer are constant and sends the signal to the oscillation circuit 12. In the high-voltage module for corona discharge comprising a ring circuit 17,
An output voltage adjustment circuit 20 for changing the output voltage value of the piezoelectric transformer 10 by adjusting a pulse width to a voltage or a resistance value in the pulse width comparison circuit 13, and an output voltage of the piezoelectric transformer 10. A variable high voltage module for corona discharge, characterized in that it comprises a DC sensing circuit 21 for converting the (5 ~ 10kV) to a low voltage (0 ~ 5V) so that the user can monitor the output voltage of the piezoelectric transformer. The variable high voltage module for corona discharge according to claim 1, wherein the output voltage adjusting circuit (20) adjusts the output high voltage value of the piezoelectric transformer (10). According to claim 1, wherein two high voltage circuits (x) (x ') each consisting of all the circuits are connected in parallel, and a low frequency PWM is generated by adjusting a resistance value to generate the two high voltage circuits (x) ( parallel to the PWM controller 30 and the piezoelectric transformer 10 of each of the high voltage circuits (x) (x ') so that the power driving circuit 14 of x') alternately turns on / off by the frequency of the low frequency PWM. And a push wave generation circuit 31 for connecting to and converting the final output voltage into a variable low frequency push wave voltage.

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