| 摘要 |
FIELD: measuring equipment.SUBSTANCE: invention relates to measurement equipment and can be used for assessing suitability of electricity meters from uncontrolled extraction. Device comprises bridge circuit of two parallel circuits of storage capacitors charge and diagonal discharge circuit connected to power network, as well as switching charging and discharging currents in bridge circuit control device. At that, symistors are used as switches of charging and discharging currents and their switching by short pulses control circuit is based on two control circuits. First circuit consists of in-series connected with sync pulse with double frequency network voltage comparator, first differentiating circuit, first transistor amplifier and first monostable multivibrator with transformer output connected to two extra pulse amplifiers power transformer outputs to control inclusion of bidirectional of charging circuits symistors of bridge circuit. Second circuit includes in-series connected to output of first transistor amplifier of second monostable multivibrator with controlled duration pulse generated within quarter to half of each of alternating voltage network, inverter, second differentiating circuit, second transistor amplifier and third univibrator with transformer output to control switching of bidirectional symistor discharge circuit of bridge circuit, connected to third pulse power amplifier with transformer output, wherein synchronising signal supplied to comparator input is removed with Herz rectifier bridge connected to step-down winding of network transformer, used in power supply device.EFFECT: technical result consists in simplification of bidirectional symistors control device and improvement of reliability of its operation.1 cl, 5 dwg |
