SU920669A1 - Multi-stage pulse dc voltage stabilizer - Google Patents

Description

one

The invention relates to a converter technique and can be used to stabilize and regulate the DC voltage in electronic devices.

Known impulse stabilizers on 5 strands are included, containing a switching key connected in series and supplying a bus between the throttles of the input 1C filter and output LSD filter 1

and 2., 0

The disadvantage of these stabilizers is their large size due to the presence of an input filter for protection against interference.

The closest to the invention technical resolution is a multifunctional pulsed voltage stabilizer containing 15 series-connected controlled switches and chokes, one of the terminals of which is connected to the diodes, and others to the load, in parallel with which a capacitor 3.20 is connected

The disadvantage of this stabilizer is the high level of high-frequency noise in the input circuit of the stabilizer due to current surges when switching keys.

The purpose of the invention is to reduce the level of high-frequency noise in the input circuit of the stabilizer.

The goal is achieved by the fact that in a multi-link pulse voltage stabilizer, containing a sequence of 1k1, connected controlled keys and chokes, one of the terminals of which are connected to the terminals, and the others connected to one of the output terminals and a capacitor connected in parallel to the output terminals, the other terminals The indicated diodes are combined and connected to the common 1-pin via an additional key, and additional diodes are introduced and connected between the first taps of the choke windings i: the common bus.

In addition, the keys can be connected to the second leads of the windings of the chokes or to the ends of the windings of the chokes associated with the diodes.

FIG. I and FIG. 2 shows diagrams of possible variants of the stabilizer in FIG. 3 - diagrams of the device operation.

Claims (3)

The stabilizer contains a power source 1, keys 2 and 3 connected to throttles 4 and 5, one of the outputs of which is connected) with diodes 6 and 7. Other outputs of diodes 6 and 7 are combined and connected via an additional key 8 to the common bus. Additional diodes 9 and 10 are connected between the ends of the windings of chokes 4 and 5 and the common bus. The output value of the stabilizer includes a parallel-connected capacitor 1 and a load 12. The stabilizer control system contains a trigger with a counting input 13, a master oscillator 14, a pulse-width modulator 15, a feedback value amplifier 16, a comparison device 17, a reference voltage source 18 The device works as follows. The pulses from the master oscillator 14 are fed to the trigger 13, the control voltages from the outputs of which (Uyj, Uyz in Fig. 3) ensure the operation of the keys 2 and 3, in antiphase with a duty cycle of 2, and alternately connecting the power source 1 to the throttles 4 and 5. The pulses from the master oscillator 14 also go to the pulse-width modulator 15, the control voltage from whose output (Gu2 in Fig. 3) unlocks the additional key 8 simultaneously with the switching of the keys 2, 3. For example, prn unlocking key 2, key 3 for (1 time (time moment t О in Fig. 3), the current of the drossel 5 (1dr2 in Fig. 3) is closed through the opening of the additional switch 8 along the circuit: the right terminal of the winding of the choke 5, capacitor 11 and the load 12, the key 8, diode 7, the left winding terminal throttle 5. At the same time, the current of the power source 1 flows through the choke 4 (i | ip, in Fig. 3) at the following value: "plus power supply 1, switch 2, choke 4, capacitor 11 and load 12;" minus power supply 1, Time the public state of the additional key 8 (time interval О - t; in fig. 3) set by the pulse-width modulator 15 and depends on the signal in the feedback circuit, containing the amplifier 16, the comparison device 17 and the source of the reference voltage 18. When the additional switch 8 is turned off (time t; Fig. 3) the current Drossel 5 is closed in a circuit: right winding lead of Drossel 5, capacitor 11 and load 12, diode 9, tap of the throttle winding. In the next half-period, the processes occurring in one m of the stabilizer links are repeated in another link. When the voltage of the power source 1 or the value of i-ia load 12 is changed, the open state of the auxiliary switch 8 is changed by means of a feedback circuit and a pulse-width modulator 15 so that the output voltage of the stabilizer is kept almost constant. By varying the voltage of the reference source 18, it is possible to adjust the output voltage of the stabilizer. If a large multiplicity of regulation of the output voltage is not required, or it is necessary to stabilize the voltage, which varies in small limits, then it is advisable to use the stabilizer shown in FIG. 2 In this case, the designs of the chokes of the smoothing filters are simplified. When the number of stabilizer links is more than two, instead of trigger 13, it is necessary to use a ring counter. In comparison with the known stabilizer, in this stabilizer there is a much smaller ripple of the input current with the same number of links. Reducing the ripple in the input current reduces the level of high-frequency noise at the input to the stabilizer. The amplitude of the current pulses flowing through the keys and, consequently, their installed power is reduced. This is especially true for transistor switches that are sensitive to overcurrent. A decrease in the ripple of the current consumed from the power source means a decrease in the losses of motions on the internal resistance of the source. In addition, the stabilizer control system is simpler in this device, since only one down-pulse modulator and a simple (low-phase) master oscillator are needed. Claim 1. Multiply impulse voltage stabilizer containing sequentially connected controlled keys and chokes, one of the outputs of which are connected to the diodes, and others with one of the output terminals, and a capacitor connected in parallel with the output terminals , different in that, in order to reduce the level of high-frequency noise in the input circuit, the other terminals of these diodes are combined and connected to the common bus via an additional key, and additional diodes connected first between water windings chokes and common bus. 2. A stabilizer according to claim 1, characterized in that the keys are connected to the second leads of the windings of the chokes. 3. A stabilizer according to claim 1, characterized in that the keys are connected to the ends of the windings of the chokes associated with the diodes. Sources of information taken into account during the examination 1. USSR author's certificate No. 559231, cl. G 05 F 1/56, 1975. 2. USSR author's certificate number 641417, cl. G 05 F 1/46, 1979. 3. USSR author's certificate number 327462, cl. G 05 F 1/56, 1972. / OrNrNTV V. ig.2 Igpl