KR940007023Y1 - Drive circuit for fluorescent lamp - Google Patents

Abstract

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Description

Fluorescent lamp driving circuit

(A) and (b) are detailed circuit diagrams of the fluorescent lamp driving circuit according to the embodiment of the present invention.

The present invention relates to a fluorescent lamp driving circuit, and more specifically, to enable the fluorescent lamp to be driven through contact with the human body, and to increase the driving frequency of the fluorescent lamp so that the light of the fluorescent lamp can be felt more smoothly, and the fluorescent lamp driving circuit. The present invention relates to a fluorescent lamp driving circuit capable of saving power by supplying power to another part of the fluorescent lamp driving circuit using an output voltage inside the circuit.

Fluorescent lamps, incandescent lamps, and the like have been used as general home lighting devices, but fluorescent lamps having much higher illumination and high power efficiency are widely used than incandescent lamps.

The technique for turning on such fluorescent lamps has been disclosed in Korean Utility Model Registration Application No. 92-1705 (application date: January 19, 1990 AD) "lighting device of fluorescent lamps".

The " lighting device of fluorescent lamp " does not shift the phase by the capacitor by simply rectifying the input power supply without back pressure rectification, thereby eliminating the need to install a low frequency coil for phase correction. In order to prevent noise and overheat generators, and to increase the voltage at the power input side in order to apply a high voltage to the fluorescent lamp, a transformer is connected to the other end of the induction winding in which one end is connected to the input side of the fluorescent lamp, that is, the transistors on and off alternately. Has an operating characteristic of supplying a voltage by connecting an inductor and a fluorescent lamp through a.

However, the conventional conventional fluorescent lamp driving circuit including the above-mentioned "fluorescent lamp lighting device" has a disadvantage in that the quality of the fluorescent light is not smooth by driving the fluorescent lamp using the frequency of commercial AC power supplied to the home. There is a drawback of using a switch of the type that is on-off only when a certain force is applied to the fluorescent lamp as a drive switch of a fluorescent lamp.

This drawback not only adds eye fatigue to the user when the conventional fluorescent lamp is used as a lighting device for a desk for students to study, but also inconveniences that the user must apply a certain force to operate the driving switch of the fluorescent lamp. In addition, the operation method of the drive switch seems to be lower than that of the contact method, and causes a problem of contact failure caused by mechanical wear of the drive switch.

Therefore, the object of the present invention is to solve the above-mentioned disadvantages, to enable the fluorescent lamp to be driven through the contact of the human body, and to increase the driving frequency of the fluorescent lamp so that the light of the fluorescent lamp can be felt more smoothly, In addition, the present invention provides a fluorescent lamp driving circuit capable of saving power by supplying power to another part of the fluorescent lamp driving circuit using an output voltage inside the fluorescent lamp driving circuit.

The constitution of this invention for achieving the above object, the touch sensing unit for detecting whether the human body is in contact; An oscillator connected to the touch sensing unit and generating a high frequency pulse signal when the human body contacts the body; A drive signal generator connected to the touch detector and configured to generate a drive signal from which noise is removed when the human body contacts the touch sensor; A rectifying unit connected to a power plug and rectifying and outputting an AC input power and blocking the AC input power when the fluorescent lamp driving circuit generates heat above a predetermined temperature; While supplying high-frequency power for driving a fluorescent lamp according to the output signal of the oscillator, while supplying the DC power required by other parts of the fluorescent lamp driving circuit according to the output signal of the drive signal generator, the fluorescent lamp is lighted using the internal output voltage. A driving unit for reducing power by replacing and supplying DC power required by other parts of the circuit; It consists of a fluorescent lamp connected to the drive unit.

With reference to the accompanying drawings, a preferred embodiment for easily carrying out this invention by the above-described configuration will be described in detail.

(A) and (b) are detailed circuit diagrams of the fluorescent lamp driving circuit according to the embodiment of the present invention. As shown in the drawings (a) and (b), the configuration of the fluorescent lamp driving circuit according to the embodiment of the present invention includes a touch sensing unit 10 having an input terminal connected to the touch signal line PS, and a touch sensing unit 10. Oscillator 20 having an input connected to the output terminal, a drive signal generator 30 having an input connected to the output terminal of the touch sensing unit 10, and a signal sound generator 40 having an input connected to the output terminal of the touch sensing unit 10. And a driving unit 70 having an input terminal connected to an output terminal of the double voltage rectifying unit 60 connected to an input terminal of the power plug 50, the oscillating unit 20, the driving signal generator 30, and the double voltage rectifying unit 60. And a fluorescent lamp 80 connected to the driving unit 70.

The configuration of the touch sensing unit 10 includes a resistor R11 having one terminal connected to the contact signal line PS, a capacitor C11 having one terminal connected to the other terminal of the resistor R11, and a capacitor C11. ) is different from the one terminal and a resistor connected in parallel to the ground (R13) and the capacitor (C12), a capacitor (resistance (R12) connected between a connection point of the supply voltage (V _DD) of the C11, C12) and the capacitor (C11 of Resistor R14 having one terminal connected to the connection point of C12, a cathode connected to the other terminal of resistor R14, and the anode connected to a grounded diode D12 and a power supply voltage V _DD . A resistor having one terminal connected to a diode D11 having an anode connected to the cathode of the diode D12, a shim trigger S11 having an input terminal connected to the anode of the diode D11, and an output terminal of the shimit trigger S11. (R15), diode D13 having a cathode connected to the other terminal of resistor R15, and power supply voltage (V). _DD ) and a resistor R16 connected between the anode of the diode D13, a capacitor C13 connected between the anode of the diode D13 and ground, and a resistor connected in series between the anode of the diode D13 and ground ( R17) and a switch SW11, a Simmit trigger S12 having an input terminal connected to the anode of the diode D13, a diode D14 having an anode connected to the output terminal of the Smit trigger S12, and a diode D14. D-type flip-flop with a resistor (R18) connected between the output terminal of the circuit and ground, and a clock terminal connected to the output terminal of the summit trigger (S12), and the generation output terminal (/ Q) and the input terminal (D) connected to each other. DF11, resistor R19 having one terminal connected to power supply voltage Vcc, capacitor C14 connected between the other terminal of resistor R19 and ground, and resistor R19 and capacitor C14 Summit trigger (S13) with input terminal connected to the connection point, output terminal of Smit trigger (S13) and D flip-flop The resistor R1A is connected between the reset terminal R of the rob DF11.

In addition, the configuration of the drive signal generator 30 may include a trigger (S31) and an input terminal connected to an inverted output terminal (/ Q) of the D flip-flop (DF11) of the touch sensing unit (10). A resistor R31 having one terminal connected to the output terminal of the trigger S31, a transistor Q31 having a base connected to the other terminal of the resistor R31 and a collector connected to the power supply voltage V _DD , and a transistor ( A resistor R32 connected between the emitter of Q31) and ground, a resistor R33 having one terminal connected to the emitter of transistor Q31, and a light emitting diode connected between the other terminal of the resistor R33 and ground. An optical coupling element PC31, a resistor R34 connected between the power supply voltage Vcc and the optical coupling element PC31, and a resistor R35 connected between the optical coupling element PC31 and ground.

In addition, the above-described configuration of the beep generator 40 includes an anode connected to the output terminal of the trigger trigger S41 and the output trigger of the trigger trigger S41 connected to the cathode of the diode D14 of the touch sensor 10. Connected to the diode (D41), the resistor (R41) connected between the cathode of the diode (D41) and the ground, the trigger (S42), the input trigger connected to the cathode of the diode (D41), and the trigger (S42) Speaker (SP41) connected to the output terminal of the.

In the embodiment of the present invention, although the MC14584B (HEX SCHMITT TRIGGER) chip of MOTOROLA Co., Ltd. is used as the above-described shimit triggers S11 to S13, S31, S41 and S42, the technical scope of the present invention is not limited thereto. .

In addition, the configuration of the above-mentioned double voltage rectifier 60 includes a capacitor C61 connected between the lie filter coils L61 and L62 connected to the power plug 50, the line filter coils L61 and L62, and a power source. A bimetal switch BS61 having one terminal connected to the connection point of the plug 50 and the capacitor C61, and a resistor R61 and a lamp LP61 connected in series between the other terminal of the bimetal switch BS61 and ground. And a bridge diode BD61 connected between the connection point of the bimetal switch BS61 and the resistor R61 and ground, and capacitors C62 and C63 connected in series between the output terminal of the bridge diode BD61.

In addition, the configuration of the driving unit 70 includes a resistor R71 and R72 having one terminal connected to the double voltage rectifying unit 60 and a base connected to the other terminal of the resistor R71 and the other of the resistor R72. A transistor Q71 having a collector connected to one terminal, a zener diode ZD71 having a cathode connected to a base of the transistor Q71 and an anode connected to a double voltage rectifier 60, and a cathode and an anode of the zener diode ZD71 A resistor R73 and a capacitor C72 connected in parallel between the capacitor C71 connected to the capacitor, the emitter of the transistor Q71 and the anode of the zener diode ZD71, and the driving signal line of the driving signal generator 30. A Zener diode ZD73 having a cathode connected to the DRV and an anode connected to the anode of the Zener diode ZD71, a capacitor C73 connected between the anode and the cathode of the Zener diode ZD73, and the driving signal generator 30 Base is opened to the drive signal line (DRV) of The transistor Q72, the Zener diode ZD72 having a cathode connected to the connection points of the resistors R71 and R72, the resistor R74 connected between the anode of the Zener diode ZD72 and the collector of the transistor Q72, and the transistor A diode D71 having an anode connected to the emitter of Q72, a resistor R75 and a capacitor C74 connected in parallel between the cathode of the diode D71 and the anode of the zener diode ZD73, and the oscillator 20 A capacitor (C75) having one terminal connected to the oscillation signal line (HF) of the transformer, a transformer (T71) having a primary coil connected to the other terminal of the capacitor (C75), and a cathode having a cathode connected to the secondary coil of the transformer (T71) (D72), a resistor (R76) connected between the anode and the cathode of the diode (D72), a resistor (R77) and a capacitor (C76) connected in series between the anode and the transformer (T71) of the diode (D72), a diode The gate is connected to the anode of (D72) and the zener die A field effect transistor Q73 having a source connected to the cathode of ZD72, a diode D73 having a cathode connected to the other secondary coil of the transformer T71, and an anode of the diode D73 and a transformer T71. The resistor R78 and capacitor C77 connected in series, the field effect transistor Q74 having a gate connected to the anode of the diode D73 and a source connected to the drain of the field effect transistor Q73, and the diode D71 Diode D74 having a cathode connected to the cathode, and a field effect transistor Q73. Transformer T72 having a primary coil connected to the connection point of Q74) and the fluorescent lamp 80, and having a secondary coil connected between the anode of the diode D74 and the drain of the field effect transistor Q74, and the cathode of the diode CD74; The capacitor C78 is connected between the drain of the field effect transistor Q74 and the capacitors C79 and C7A are connected in series between the source of the field effect transistor Q73 and the drain of the field effect transistor Q74.

The operation of the fluorescent lamp driving circuit according to the embodiment of the present invention by the above configuration is as follows.

When the user connects the power plug 50 to a power socket (not shown), the AC power input to the double voltage rectifier 60 through the power plug 50 is connected to the line filter coils L61 and L62 and the capacitor ( After the noise is removed while passing through C61, it is applied to the bridge diode BD61 through the bimetal switch BS61.

In this case, a part of the power signal passing through the bimetal switch BS61 is applied to the lamp LP after the voltage drops through the resistor R61 to drive the lamp LP61. By visually confirming that the light is emitted, it can be seen that AC power is input through the power plug 50.

The AC power input to the bridge diode BD61 of the double voltage rectifier 60 is full-wave rectified by the bridge diode BD61 and then charged in the capacitors C62 and C63 to be converted into DC power. As described above, the DC power charged in the capacitors C62 and C63 is output to the driving unit 70.

When the DC power supply is input from the double voltage rectifying unit 60 to the driving unit 70, the constant voltage stabilized by the zener diode ZD71 of the driving unit 70 is input to the base terminal of the transistor Q71. Thus, transistor Q71 is turned on and the emitter terminal output voltage of transistor Q71 is charged to capacitor C72.

In this way, the voltage charged in the capacitor C72 is supplied to another part of the fluorescent lamp driving circuit requiring a DC power source to operate the entire fluorescent lamp driving circuit.

When the fluorescent lamp driving circuit is in an operation standby state due to the voltage charged in the capacitor C72 of the driving unit 70, when a user touches a part of the human body such as a finger to the switch to operate the fluorescent lamp, the human body is moved through the switch. The touch signal PS, which is a weak electrical signal generated from the input signal, is input to the touch sensor 10.

The contact signal PS input to the touch sensing unit 10 is charged into a capacitor C12 after being transformed into a pulse wave by a differential circuit composed of resistors R11 and R13 and a capacitor C11. The signal charged in the capacitor C12 is further shaped by the noise triggers S11 and S12 and is input to the clock terminal of the D flip-flop DF11.

When the power supply voltage Vcc is initially applied, the D-type flip-flop DF11 is reset by a reset circuit composed of a resistor R19, a capacitor C14, and a shim trigger S13. Therefore, initially, the output terminal Q of the D-type flip-flop DF11 has a low state value, and the inverted output terminal / Q has a high state value.

In this state, when the output signal of the summit trigger S12 is input to the clock terminal of the D flip-flop DF11, the output signal of the inverted output terminal / Q having a high state is input to the input terminal D. By being input to, the output signal of the inverted output terminal / Q is switched to the low state and output to the driving signal generator 30, and at the same time, the high state signal is output from the output terminal Q to the oscillator 20.

When the low state signal is input from the touch sensing unit 10 to the driving signal generator 30, the input signal is shaped by removing the noise by the time trigger S31 of the driving signal generator 30. The transistor Q31 is turned on by being input to the base terminal of the transistor Q31.

When the transistor Q31 is turned on, the signal of the high state is input to the optical coupling element PC31 from the emitter terminal of the transistor Q31 to operate the optical coupling element PC31. When the optical coupling element PC31 is operated, the optical signal is converted into the optical signal by the optical coupling element PC31, and then the transmission of the electrical noise signal is blocked in the process of converting the optical signal into the electrical signal, thereby further stabilizing. The signal is output to the driving unit 70 as a driving signal DRV.

When the driving signal DRV is input from the driving signal generator 30 to the driving unit 70, the constant voltage stabilized by the zener diode ZD73 of the driving unit 70 is input to the base terminal of the transistor Q72. Thus, transistor Q72 is turned on and the emitter terminal output voltage of transistor Q72 is charged to capacitor C74.

In this way, the voltage charged in the capacitor C74 is supplied to another part of the fluorescent lamp driving circuit requiring a DC power source to operate the entire fluorescent lamp driving circuit.

In this case, when the amount of current flowing through the resistor R74 connected to the collector of the transistor Q72 becomes large, the resistor R74 generates heat, and the resistor R74 of the double voltage rectifier 60 Since it is physically connected to the bimetal switch BS61, when the heat generated from the resistor R74 rises above a certain temperature, the bimetal switch BS61 is turned off. Therefore, since the operation of the bridge diode BD61 of the double voltage rectifying unit 60 is blocked, the operation of the entire fluorescent lamp driving circuit is cut off, and at the same time, the lamp LP61 is turned off, so that the user can disconnect the bridge diode BD61 from the power plug 50. You can see that AC power input to) is cut off. Therefore, it is possible to prevent the fluorescent lamp driving circuit from being electrically damaged by the overload.

When a high state signal indicating that a part of the human body is in contact with the switch by the user from the touch sensor 10 is input to the beep generator 40, the input signal passes through the triggers S41 and S42. While the noise is removed, the waveform of the signal is shaped and applied to the speaker SP41. Therefore, a signal tone is generated from the speaker SP41 to inform the user that the operation of the fluorescent lamp driving circuit is started.

In addition, when a high state signal is input from the touch sensor 10, the oscillator 20 generates a high frequency signal HF having a very high frequency and outputs the generated high frequency signal HF to the driver 70.

When the high frequency signal HF is input from the oscillator 20 to the driver 70, the high frequency signal HF is applied to the primary coil of the transformer T71 via the capacitor C75. Therefore, the voltage of each winding ratio is induced in the secondary coil of the transformer T71, and the voltage induced in the secondary coil of the transformer T71 is respectively passed through the diode D72.D73 to the field effect transistor Q73. Q74. The field effect transistors Q73 and Q74 are driven by being input to the gate terminal of.

When the field effect transistors Q73 and Q74 are driven, the output voltages of the field effect transistors Q73 and Q74 are applied to the fluorescent lamp 80 so that the fluorescent lamp 80 is driven. Therefore, the light is emitted from the fluorescent lamp 80 can serve as a lighting device.

In this case, since the fluorescent lamp 80 is driven at a very high frequency, the quality of light felt by the user is very soft and does not cause glare compared to the conventional fluorescent lamp driving circuit using a frequency of commercial AC power supplied to general households. As a result, eye fatigue may be reduced.

When the fluorescent lamp 80 is driven as described above, the output voltages of the field effect transistors Q73 and Q74 are applied to the fluorescent lamp 80 via the primary coil of the transformer T72, and thus the transformer T72. Secondary voltage is induced by the current flowing through the primary coil.

The secondary voltage of the transformer T72 thus induced is charged to the capacitor C78 via the diode D74, and the voltage charged to the capacitor C78 is charged to the capacitor C74 via the resistor R79 and is directly charged. The entire fluorescent lamp driving circuit is operated by being supplied to another part of the fluorescent lamp driving circuit requiring power. Therefore, the transistor Q72 can be prevented from being electrically damaged due to an overload, and the secondary voltage by the transformer T72 replaces the emitter terminal output voltage of the transistor Q72 with the effect of saving power. Occurs.

As described above, in the embodiment of the present invention, the fluorescent lamp can be driven through the contact of the human body, and by increasing the driving frequency of the fluorescent lamp, the light of the fluorescent lamp can be felt more smoothly, and the inside of the fluorescent lamp driving circuit By supplying power to other parts of the fluorescent lamp driving circuit by using the output voltage of the fluorescent lamp driving circuit having the effect of reducing the power can be provided. This effect of the invention can be used in the field of lighting devices using fluorescent lamps.

Claims (4)

A touch sensing unit 10 for sensing whether the human body is in contact; An oscillator 20 connected to the touch sensing unit 10 and generating a high frequency pulse signal HF when the human body contacts the body; A driving signal generator 30 connected to the touch sensing unit 10 and generating a driving signal DRV from which noise is removed when the human body contacts the body; A rectifier 60 connected to the power plug 50 and blocking the AC input power when the fluorescent lamp driving circuit generates heat by rectifying and outputting AC input power; While supplying the high frequency power for driving the fluorescent lamp in accordance with the output signal of the oscillator 20, while supplying the DC power required by other parts of the fluorescent lamp driving circuit in accordance with the output signal of the drive signal generator 30 A driving unit 70 which saves power by replacing and supplying DC power required by another part of the fluorescent lamp driving circuit using the output voltage; Fluorescent lamp driving circuit, characterized in that consisting of a fluorescent lamp (80) connected to the drive unit (70). The method of claim 1, wherein the fluorescent lamp driving circuit includes a shimit trigger S41 connected to the touch sensing unit 10, a diode D41 connected to the shimit trigger S41, and a cathode and a ground of the diode D41. A signal sound generator 40 comprising a resistor R41 connected therebetween, a shim trigger S42 having an input terminal connected to a cathode of the diode D41, and a speaker SP41 connected to an output terminal of the shimit trigger S42. Fluorescent lamp bulb, characterized in that further comprises a). The method of claim 1, wherein the touch sensing unit 10 is a resistor and capacitors (R11, C11, R13, C12) for charging after differentiating the contact signal (PS), the connection point and the power supply of the capacitors (C11, C12) A resistor R12 connected between the voltage V _DD , a resistor R14 having one terminal connected to the connection point of the capacitors C11 and C12, and a shim trigger having an input terminal connected to the other terminal of the resistor R14 ( S11), a resistor R15 having one terminal connected to the output terminal of the simit trigger S11, a diode D13 having a cathode connected to the other terminal of the resistor R15, and an anode and ground of the diode D13. A capacitor C13 connected therebetween, a shimit trigger S12 having an input terminal connected to an anode of the diode D13, a diode D14 having an anode connected to an output terminal of the shimit trigger S12, and a diode D14. Resistor (R18) connected between the output terminal of the D-type flip-flop DF11 having a terminal / Q and an input terminal D connected to each other, and a reset circuit R19 for resetting the D-type flip-flop DF11 when a power supply voltage Vcc is applied. , C14, S13, R1A). The circuit of claim 1, wherein the driving unit 70 is connected to the double voltage rectifying unit 60 to supply power required by other parts of the fluorescent lamp driving circuit (R71, R72, R73, ZD71, C71, C72, Q71) and a circuit (ZD72, ZD73, R74, R75, C73, C74, connected to the drive signal generator 30) for supplying power required by other parts of the fluorescent lamp driving circuit using the internal output voltage. C75, C76, C77, C7A, T71, T72, R76, R77, R7R D72, Q73, Q74 connected to C7R, D71, D74, Q72 and the oscillator 20 to supply driving power of a high frequency fluorescent lamp. Fluorescent lamp driving circuit characterized in that consisting of.