SU1203660A1 - High-voltage stabilized d.c.power source - Google Patents

Description

The invention relates to electrical engineering and is intended for use in the implementation of power supply for compact television cameras.

The aim of the invention is to increase the quality of output voltage stabilization by replacing the pulse-width modulation of the potential; 1 control signals of the one-time voltage converter with a more efficient amplitude modulation of the current signals at its output.

FIG. 1 is a functional diagram of the proposed high-voltage stabilized DC power supply; in fig. 2 - time diagrams of voltages and currents, illustrating his work.

The device contains a single-ended voltage regulator 1 (Fig. 1) voltage with transistor 2, the emitter-base transition of which is connected to capacitors for connecting (not shown) control signal source - horizontal sync pulses, high-voltage transformer 3, the primary winding of which is included in the collector circuit of transistor 2, and a source of constant voltage (not shown), whose zero pole is connected to the emitter of transistor 2 and the corresponding output of the primary winding of high voltage transformer 3.

A high voltage rectifier 4, a voltage divider 5, a DC amplifier 6, an auxiliary transistor 7, a diode 8 and a capacitor 9. A high voltage rectifier 4 input is connected to the secondary winding of the high voltage T1) transformer 3, and output - with terminals for plug switches. 1) n with the input of the divider about nanr. The signal input of the DC power amplifier 6 is connected to the output of the de-,: voltage 5 voltage, and the reference input to the output of the voltage source (not shown). A 3mitter-base junction of the auxiliary transistor 7 is connected to the output of the DC amplifier 6, and the emitter is a collector junction bounded by the auxiliary capacitor 9 and is connected to the emitter through the auxiliary diode 8. the transistor 2 transistor of the 1 nancrystal circuit.

The device works as follows.

When applying a horizontal sync pulse Uc (Fig. 2, a) to the base of transistor 2 at the time ti, the latter opens, and through it and

five

0

0 5

0

five

the primary winding of the transformer 3 begins to flow the collector current i (fig. 2.6). By the time ty of the sync pulse l.Jc, the current ijj reaches its maximum value, the value of which is determined by the supply voltage E, the inductance of the transformer primary winding and the duration t2-ti sync pulse Uc. In the inductance of the transformer 3 there is an accumulation of energy, the value of which depends on the inductance of the transformer and the current i.

After the termination of the clock pulse Uc, the transistor 2 is closed and the energy accumulated in the transformer 3 is removed. Due to the fact that the energy storage time is several times longer than the energy return time, the voltage impulse UK (Fig. 2, c) on the collector of the transistor 2 at the time t.3- {several times exceeds the supply voltage E. As a result U TI pulses appear on the primary winding of transformer 3 (Fig. 2, d).

From the Gorichnaya winding of the transformer 3, the high-voltage impulse voltage I-Jrj. (Fig. 2, d) receives a high-voltage rectifier 4, the output of which produces a constant high voltage Lubn with a variable value. The diode 8 and the capacitor 9 are a single-half-square rectifier with a capacitive filter that rectify and smooth the impulses UK with the collector 2 of transistor 2. Load. In the aggregate, with a transistor (. |) the transistor serves as the Ilthrom. when porma.pom current at the output of the device, this transistor is closed and the current through it will not leak.

By reducing the output current of the device, the output voltage of the LJBbix increases, which leads to an increase in the voltage on the signal input of amplifier 6, to another input of which a highly stable constant 1 April Uo is applied. As a result, the output current us1 .: itel 6 and, accordingly, the base current of transistor 7 increase. As a result, the equivalent load capacitance of the capacitor 8 with filter 9 decreases and the collector current 1k of collector 2 of transistor 2 increases, which ultimately causes a decrease output voltage and output devices to the same level.

The proposed device does not require any corrective nodes and, at the same time, is characterized by improved weight and weight indicators and.

FIG. g

Claims (1)

A HIGH VOLTAGE STABILIZED DC POWER SUPPLY, containing a single-cycle voltage converter with a transistor, the emitter-base junction of which is connected to the terminals for connecting the control signal source, a high-voltage transformer, the primary winding of which is included in the collector circuit of the transistor, and a constant voltage source whose poles are connected to the emitter pole transistor and the corresponding output of the primary winding of the high voltage transformer, high voltage rectifier, input for which it is connected to the secondary winding of a high-voltage transformer, and the output is with terminals for connecting the load and with the input of the voltage divider, a DC amplifier, the signal input of which is connected to the output of the voltage divider, and the reference input to the output of the reference voltage source auxiliary diode and capacitor, characterized in that, in order to improve the quality of stabilization of the output voltage, an auxiliary transistor is introduced into it, the emitter-base transition of which is connected to the input of a constant-current amplifier ka, and the emitter-collector junction is shunted by an auxiliary capacitor and connected to the emitter-collector junction of the transistor of the voltage converter through an auxiliary diode. FIG. 1