SU923013A1 - Reservoir capacitor charging device - Google Patents

Description

(54) DEVICE FOR CHARGING ACCUMULATING CAPACITOR

t

The invention relates to a pulse technique and can be used to charge the power capacitors of flash lamps.

A device for charging a storage capacitor is known, which includes a transistor in the emitter circuit of which a piezoelectric transformer is connected, a resistor connected between the base and collector of the transformer, a storage capacitor connected to the output of the piezoelectric transformer via a rectifier, and a choke connected in parallel with the piezoelectric transformer , in which the feedback electrode is connected to the base of the transistor through a capacitor 1.

However, the efficiency of this device is low.

A device for charging a storage capacitor is known, which comprises a transformer with a primary winding, connected via a transistor USB to a power source, and a secondary winding connected through a rectifying diode to a storage capacitor; work management scheme

transistor key; a circuit that reacts to a predetermined threshold current of the primary winding of the transformer and acts on the control circuit; a circuit containing an additional transformer winding, a resistor and a diode connected to the control circuit; a circuit responsive to the storage capacitor voltage 2.

However, this device has a complex control scheme.

ten

The purpose of the invention is to simplify and increase the reliability of the device.

For this purpose, in the device for charging the storage capacitor containing a transformer, the primary winding of which through

5 the controlled transistor switch is connected to the power supply source, the secondary winding of the transformer is connected through a diode to a storage capacitor, a resistor connected by one output to the source bus

20 . power supply and one of the primary windings of the transformer, the control electrode of the transistor switch is connected to the output of the amplifier directly, and an appropriate diode connected simultaneously to the amplifier is connected to the corresponding power supply connector via the flonoji resistor. to the charge circuit of the storage capacitor. The amplifier is made on a transistor whose collector is connected to a part of the primary winding of the transformer, the base is the input of the amplifier, the emitter of the transistor is connected to the output of the second additional resistor, the second output of which is the output of the amplifier, with a stabilizer between the second output of the second additional resistor and the base of the transistor. The drawing shows a circuit diagram of the device. The device contains a storage capacitor 1, a transformer 2 with primary and secondary windings 3 and 4 and a controlled transistor switch 5, a diode 6, an additional diode 7, a resistor 8, a stabistor 9, the first and second additional resistors 10 and 11, a transistor 12, the amplifier 13 consists of a station of bistor 9, a resistor 11 and a transistor 12. The device operates as follows. When the power is turned on through the resistor 8, the bias 13 is supplied with a bias voltage, due to which the amplifier 13, and through it the key 5 is opened. A linearly increasing current begins to flow through the primary winding 3 of transformer 2, the value of which is determined by the formula where E is the voltage of the power source; L - inductance of the transformer primary winding; t is the current time. In the magnetic field of the transformer, the energy is accumulated equal to. An electromotive force is generated on the windings 3 and 4 of the transformer 2. The beginning of the windings 3 and 4 are indicated by dots. With such switching on of the windings, the voltage of the winding 4 is such that diode 6 and diode 7 are in a non-conducting state and the storage capacitor 1 is not charged at this time. When the buildup of current through the primary winding 3 of transformer 2 stops, the electromotive force on the windings of transformer 2 changes its polarity to the opposite. Diodes 6 and 7 become conductive. The voltage pulse from diode 7 has a polarity opposite to the bias voltage and, due to the resistor 10, closes the amplifier 13 and the key 5, which will be in a non-conducting state until the energy stored in the magnetic field of the transformer is It is transmitted to the storage capacitor I. The charge current of the storage capacitor 1 decreases in time from a value equal to--, where K is a transformation ratio. When the charge current of the storage capacitor 1 becomes less than the current flowing through the resistor 8, the voltage at the input of the amplifier 13 will change the polarity and the amplifier 13, and hence the key 5 will open. Further processes will be repeated. The voltage across the storage capacitor will increase. Turning on the resistor 11 and the stabistor 9 puts the transistor 12 into the current generator mode. The main component of the base current of transistor switch 5 is the emitter current of transistor 12, which is stabilized, therefore the base mode of transistor switch 5 is not affected by the spread of the gain of transistor 12 and the voltage fluctuation of the power source and the change in ambient temperature have little effect. Turning on the collector of the transistor 12 to the tap from the primary winding 3 of transformer 2 reduces the power loss in the base circuit of transistor switch 5, since the choice of where the tap is connected to the primary winding 3 of transformer 2 and the choice of the stabilizer voltage 9 The total voltage drop across the collector-emitter section of transistor 12 and resistor 11 (which basically determines the power loss in the base circuit) can be made minimally necessary. The saturation mode of the transistor switch 5 is also fully ensured in the open state, in which the losses on the transistor switch 5 are minimal. Other ways of connecting the collector of transistor 12 are less effective (for example, connecting the collector of transistor 12 to the collector of transistor switch 5 dramatically increases the voltage drop across transistor switch 5 in saturation mode and makes it impossible to stabilize the base current). Thus, the proposed device is easier known. The formula of the invention 1. A device for charging a storage capacitor containing a transformer, the primary winding of which is connected to a power source through a controlled transistor switch, the secondary winding of a transformer through a diode connected to a storage capacitor, a resistor connected by one

Claims (2)

Claim 1. A device for charging a storage capacitor, comprising a transformer whose primary winding is connected to a power source through a controlled transistor switch, the secondary winding of a transformer through a diode is connected to a storage capacitor, a resistor connected to one ° 23013 ύ an output to the bus of the power source and one of the terminals of the primary winding of the transformer, characterized in that, in order to simplify and improve the reliability of the device, the control electrode of the transistor switch is connected directly to the output of the amplifier, and with the corresponding bus of the power source through an additional resistor, the input of the amplifier is connected An additional diode connected simultaneously to the charge circuit of the storage capacitor is connected to another terminal of the resistor parallel to the input of the amplifier. 2. The device according to π. 1, characterized in that the amplifier is made on a transistor, the collector of which is connected to a part of the primary winding of the transformer, the base _e is the input of the amplifier, and the emitter is connected to the output of the second additional resistor, the second output of which is the output of the amplifier, between the second output of the second additional resistor and the base of the transistor is turned on by a stabilizer. 10 Sources of information taken into account in the examination 1. USSR copyright certificate No. 630734 class. And 03 K 3/53, 1977. 2. UK patent No. 1403307, 15 cl. H 3 T, 1971 (prototype). Order 2608/77 Circulation 954 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., D. 4/5 Branch of PPP ’’ Patent, Uzhhorod, st. Project, 4