JPS6017898A - Power source for flash discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The invention is related to the equipment for flash discharge lamps [ik: O Flash discharge lamps are for example light emitting devices or photographic devices for flashlight, and toner for facsimiles is for fixed shields. It is used as a compliment. (2) For using a 1kL flash light for fishing It has the disadvantage of being large and having a large volume. In particular, when a flash discharge lamp is used as a heat source for toner single-image fixing in a copying machine, facsimile, etc., the above-mentioned drawbacks are greatly exacerbated because in recent years there has been a strong desire to make copying machines and facsimiles smaller and lighter.

For this reason, a flash discharge lamp power supply device using an inverter having a semiconductor switching element has recently been developed, and this m'01 device has the advantages of being small and lightweight.

FIG. 1 is an explanatory circuit diagram showing an example of the configuration of such a flash discharge lamp power supply device. In this example, e is an AC power source, and 5 input terminal a of this AC power source e.

A bridge type rectifier circuit 5 composed of diodes 51, 52, 58, and 54 is connected to b.

This inverter 1 is connected to the output terminal of the lFi rectifier circuit 5, and this inverter 1 consists of transistors 11 and 12, which are semiconductor switching elements, three capacitors i3, 14.15, and two diodes. 16.
17. The collector of the transistor 11 is connected to the positive side of the output terminal of the rectifier circuit 5, the emitter of the transistor 11 is connected to the collector of the transistor 12, and the emitter of the transistor 12 is connected to the negative side of the output terminal of the rectifier circuit 5. . A capacitor 13 and a capacitor 14 are connected in series between the connection point between the positive side of the output terminal of the rectifier circuit 5 and the collector of the transistor 11 and the connection point between the negative side of the output terminal of the rectification circuit 5 and the emitter of the transistor 12. These capacitors 13 and 14
A capacitor 15 is connected between the connection point of the transistor 11 and the connection point of the emitter of the transistor 11 and the collector of the transistor 12.
and the primary coil of the step-up transformer 2 connected in the next stage are connected in series. The bases of transistors 11 and 12 are connected to a drive circuit 105, which will be described later.
A diode is provided between the collector and emitter of transistor 11 and between the collector and emitter of transistor 12, respectively.
) 116 and 17 are connected, 2 is a step-up transformer, the primary coil of this step-up transformer 2 is connected to the inverter 1 as described above, and the secondary coil is connected to the rectifier circuit 3 of the next stage. is connected to the input end of the

3 is a voltage doubler rectifier type rectifier circuit, and this rectifier circuit 3
is composed of four diodes 31, 32, 33, 34 and four capacitors 35, 36, 37.38. The capacitor 35 and the diode 1-I31 are connected in series to the secondary coil of the transformer 2, and the diode I33 and the capacitor 37 are connected in series to both ends of the diode 31, and the secondary coil of the transformer 2 and the capacitor 35
A capacitor 36 and a diode 32 are connected in series between the connection point between the secondary coil and the diode 31, and a diode 34 and a capacitor 38 are connected in series between both ends of the diode 32.

Reference numeral 4 denotes an L-discharge TU capacitor connected between the output terminals of the rectifier circuit 3, and a flash discharge lamp 7 is connected to both ends of the charge/discharge capacitor 4, and a flash discharge lamp 7 is connected to both ends of the charge/discharge capacitor 4. The discharge lamp 7 is supplied with electric charge necessary for flash generation.

Reference numeral 100 denotes a semiconductor switching element control mechanism (hereinafter simply referred to as "control mechanism"), and this control mechanism 100 includes an error amplifier 5101 that receives the voltage across the charging/discharging capacitor 4 as an input signal, and a reference to this error amplifier 1ON. A reference voltage source 102 that applies a voltage, an oscillator 103 that generates a rectangular pulse signal, and an error amplifier 101 that receives an e-rus signal from the oscillator 103 and converts the pulse width of the e-rus signal into a signal from an error amplifier 101. The pulse width converter 104 adjusts the signal based on the pulse width converter 104 and outputs the signal alternately from the output terminal, and the transistors I and I2 are adjusted alternately based on the signal alternately output from the output terminal of the pulse width converter 104. and a drive circuit 105 for driving.

The pulse width converter 104 is connected to the oscillator 103.
A sawtooth generator 106 receives the error signal and generates a sawtooth wave signal of the same frequency, and receives the signal from the error amplifier 101 and the (6) sawtooth wave signal from the sawtooth generator 106, and calculates the error. A comparator 107 that outputs a "low level" signal when the signal voltage of the amplifier 101 is larger than the sawtooth wave signal voltage, and outputs a "high level" signal when it is smaller; and this comparator 107 The AND signal of the output signal of the output signal of the converter and the pulse signal from the oscillator 108 is output, and when the output signal 1 of the converter and e-lator 107 is "low level", the output becomes zero, and conversely, when it is "high level", the output signal of the oscillator 107 is output. Ant game 1-108 that outputs a signal with the same pulse width as the 10B pulse signal.
Then, receiving the output signal of this Antogame 1-108,
A clip-flop circuit that alternately outputs this signal from two output terminals Q and Q, and one output terminal Q of an AND gate 108° flip-flop circuit 109.

an AND gate 110 which receives three signals from the glow prevention signal generating mechanism 9 and outputs a AND signal thereof; and an AND gate) 108. An ant game receives eight signals from the other output terminal Q of the clip-flop circuit 109 and the glow prevention signal generating mechanism 9 and outputs their AND signal.
1-111, and the glow prevention signal generating mechanism 9 is activated in conjunction with the drive of the trigger circuit 8, which will be described later. Sometimes the anti-glow signal is at a "high level", and when this anti-glow signal is at a "low level", the anti-glow signal and the anti-glow signal are
The output of 111 becomes zero.

8 is a trigger circuit for driving the trigger electrode 71 provided in the flash discharge lamp 7, and this trigger circuit 8 has a secondary coil connected between the trigger electrode 71 and the cathode of the flash discharge lamp 7. A pulse transformer 81, a capacitor 82 and a thyristor 83 connected in series to both ends of the primary coil of this noggle transformer 81, and a Zener diode rs, i connected to both ends of this thyristor 83.
, a resistor 85 connected between the anode of the thyristor 83 and the anode of the flash discharge lamp 7, and a resistor 86 connected between the gate and cathode of the thyristor 83,
When a trigger signal is input to the gate of the thyristor 83, a high voltage is applied to the trigger electrode 71.
98(3).

According to the power supply device configured as described above, the
In the control mechanism 1 (
By being turned on and off alternately from 10K, the DC from the rectifier circuit 5 is once converted to AC, then this AC is converted back to DC by the soft current circuit 3, and this DC is used to charge and discharge the capacitor 4. Charge is accumulated. When the voltage across the charging/discharging capacitor 4 reaches a level necessary for flash generation, the pulse width of the ξ pulse current supplied to the troughs of the transistors 11 and 12 by the control mechanism 100 becomes almost zero. As a result, the voltage across the charging/discharging capacitor 4 is maintained at the set voltage corresponding to the reference voltage of the reference voltage source 102 of the error amplifier 101. In this way, when the voltage across the charging/discharging capacitor 4 reaches the set voltage, the trigger circuit 8
As a result, a high voltage is applied to the trigger electrode 71, which causes dielectric breakdown between the discharge electrodes of the flash discharge lamp 7, and at this moment the charge accumulated in the charging/discharging capacitor 4 flashes (9). is supplied to generate a flash of light. Then, the anti-glow signal generation mechanism 9 is activated in conjunction with the trigger circuit 8, and the signals 110 and 111 are set to "low level".
A glow prevention signal is input for a certain period of time, and the operation of transistors 11 and 12 is thereby stopped, and the
The output from the capacitor 1 becomes zero, and charging of the charging/discharging capacitor 4 is stopped for a certain period of time, thereby preventing the flash discharge lamp 7 from entering a glow discharge state after the flash disappears. Then, after a certain period of time has elapsed, when the glow prevention signal becomes a "high level", the control mechanism 100 controls the pulse width of the current supplied to each of the transistors 11 and I2 to increase, and the battery is charged and discharged again. Electric charge is accumulated in the capacitor 4, and flashing light is repeatedly generated in the same manner as described above.

However, in the above-mentioned power supply device, the direct current flowing from the AC power source e into the inverter l is relatively large, and therefore, the AC power source e needs to have a large mixed current capacity.

For example, when the power supply device is used for fixing toner images in a copying machine or facsimile (10), the copying machine or facsimile machine is installed in a company, an office, or a general home, and the AC power supply is AC power, JOOO, etc.
The so-called commercial power source of V is used, and the amount of current that can be drawn from this commercial power source is relatively small, and considering the case where other electrical equipment is used together, the amount of current drawn from the AC power source e is reduced from a safety point of view. It is hoped that they will be able to produce something similar to this.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a highly safe and convenient power supply device for flash discharge lamps that can reduce the current burden of an AC power source. Its features include an inverter having semiconductor switching elements, a reactor connected to the input of the AC power source at the front stage of this inverter, and a rectifier connected to the output of the inverter. circuit and
A charging/discharging capacitor connected to the output end of this rectifier circuit, a trigger circuit for applying a trigger voltage to a flash discharge lamp connected to both ends of this charging/discharging capacitor, and a semiconductor switch (11 ) A semiconductor switching cable control mechanism for operating the switching element.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is an explanatory circuit diagram showing an embodiment of the present invention,
Components that are the same as those shown in FIG. 1 are denoted by the same reference numerals, and explanations thereof will be omitted since they are the same. In this example, one input terminal of the AC power supply e is a rectifier circuit 5.
Connect the reactor tube 6 between.

According to the above embodiment, the reactor 6 provides an AC power supply e.
Since the current flowing into the inverter l is further suppressed to a smaller value, the magnitude of the current taken out from the alternating current power source e can be reduced. Incidentally, in the device with the configuration shown in Figure 1, the current flowing into the inverter 1 from the AC power supply e is 9.5
A fff was 1 degree, but as shown in Figure 2, the inductance was about 0.8 to 1 mH.
When adding , the current flowing into the inverter l from the alternating current power supply e was reduced by about 10%. In this way, AC power supply e
Since the magnitude of the current output can be reduced, when the device is used in a small company, office, or general home, it is possible to have a margin in the commercial power supply, and as a result, when using the device in a small company, office, or general home, it is possible to can be used together in a highly safe manner, making it extremely convenient.

In the above, the value of the inductance of the reactor 6 is determined so that the time required to charge the charging/discharging capacitor 4 is within a range that does not cause any practical problems. If the inductance value of the reactor 6 is too large, it will take a long time to charge the discharge capacitor 4, which is inconvenient if flashes are to be repeatedly generated in a short period of time.

Although one embodiment of the present invention has been described above, in the present invention, the reactor 6 may be connected between the rectifier circuit 5 and the inverter l, and in this case, it is similar to the embodiment described above. It is possible to obtain the following effects.

As described above, the present invention provides an innovative inverter having a semiconductor switching element, a cover (18) connected to an input end of an AC x source in the preceding stage of the inverter, and a a rectifier circuit connected to the output end of the rectifier circuit, a charging/discharging capacitor connected to the output end of the rectifying circuit, and a trigger circuit applying a trigger voltage to the flash discharge lamp connected to both ends of the charging/discharging capacitor. ,
A power supply device for a flash discharge lamp characterized by comprising a semiconductor switching element control mechanism for operating the semiconductor switching element according to the invention.
Accordingly, it is possible to provide a flash discharge lamp power supply device that is highly safe and convenient because it can reduce the current load of the AC power supply.

[Brief explanation of the drawing]

FIG. 1 is an explanatory circuit diagram showing an example of a conventional flash discharge lamp power supply device, and FIG. 2 is an explanatory circuit diagram showing an embodiment of the present invention. e... AC current s 5... Rectifier circuit l... Inverter 11.12... Transistor 2
...External pressure transformer 3...Rectifier circuit 4...Charging/discharging capacitor 7...Flash discharge lamp 71...Trigger electrode 8...Trigger circuit (14) 9...Glow prevention signal generation Mechanism 100...Semiconductor switching element control mechanism 101
... Error amplifier 10B ... Oscillator 104 ・
...Pulse width converter 105 ...Drive circuit 106 ...Sawtooth wave generator 107 ...Connoserator 108 ...AND gate 109 ...Flip float circuit 110.
111...And Gate 6...Reactor agent Patent attorney Tomi Oi Applicable, -・, -8, (1,
“1

Claims (1)

[Claims] ■) An inverter comprising a semiconductor switching resistor, an actuator connected to the input end of an AC power source in the preceding stage of the inverter, a rectifier circuit connected to the output end of the inverter, and the rectifier circuit connected to the output end of the inverter; A charging/discharging capacitor connected to the output end of the circuit, a trigger circuit for applying a trigger voltage to the flash discharge lamp connected to both ends of the photodischarge capacitor, and a half-pack for operating the switching element in the inverter. 1. A power supply device for a flash discharge lamp, comprising a body switching element control mechanism.