CN2449310Y - Power supply control desk for physics experiment room - Google Patents

Abstract

The utility model relates to a power supply control desk for a physics laboratory. The utility model comprises a teacher demonstration main control desk and a student experiment desk, wherein, the teacher demonstration main control desk and the student experiment desk are respectively composed of a transformer, a rectification circuit, a voltage stabilizing circuit, a voltage regulation circuit, and an overload protection circuit. The utility model is mainly characterized in that the overload protection circuit adopts independent power supply winding to supply power. An overload sensor which is connected in a main circuit in series is used for controlling the work power supply of a relay which is arranged in the overload protection circuit, and a normally closed contact of the relay is used for controlling the opening and the closing of the main circuit. The utility model has the advantages of good effect of protection, and reliable work. The utility model is suitable for physics teaching experiment devices for technical secondary schools, vocational senior middle schools, general senior middle schools, etc.

Description

Physics laboratory's power console

The utility model relates to a kind of physics teaching experiment equipment, specifically about a kind of physics laboratory power console.

The Physical Experiment content is a lot, and is also different at the required power supply signal of different experiment content of when experiment.So will be equipped with the required power supply signal of various experiments in that Physical Experiment is indoor.In the past, we adopt the AC-DC voltage stabilizer of purchasing all size usually, and the power supply signal of Physical Experiment is provided, its troublesome poeration, and conventional efficient is low.Along with science and technology and expanding economy; educational undertaking is also in fast development; various advanced persons' instruments used for education and equipment are continually developed application; multiple functional Physical Experiment set of equipments is generally promoted; its function comprises that the teacher demonstrates master station and student experimenting platform; electrical principle mainly is made up of power transformer, rectification circuit, mu balanced circuit, regulating circuit, holding circuit etc.; the output DC voltage-stabilizing is adjustable continuously; alternating voltage is selected by step switch, and is multiple functional, easy to operate, conventional efficient is high.But the holding circuit of existing product all is to adopt fuse circuit to form, in case during the external circuit short circuit, because the intensification fusing process of fuse needs a period of time, cause the damage of main circuit components and parts easily, its protective value is poor, and it is unreliable to work.

The purpose of this utility model is the problem that exists at prior art, provides that a kind of protective value is good, physics laboratory's power console of reliable operation.

The technical scheme that realizes the utility model purpose comprises that the teacher demonstrates master station and student experimenting platform; the teacher demonstrates master station and student experimenting platform respectively by power transformer; rectification circuit; mu balanced circuit; regulating circuit and overload protecting circuit are formed; described overload protecting circuit is by Transformer Winding; rectification circuit; mu balanced circuit; g sensor and relay are formed; the working coil of relay with receive mu balanced circuit output voltage two ends after the gauge tap of g sensor and rest button are connected; the normally opened contact of relay is attempted by g sensor control and opens two ends also, and normally closed contact is serially connected in the main circuit.Its principle of work is: the alternating voltage of Transformer Winding induction is after rectification and voltage stabilizing, and the output galvanic current is pressed, and this direct-flow steady voltage provides the operating voltage of relay coil.When the main circuit normal operating conditions, the gauge tap of g sensor is in off-state, the relay outage, and its normally open contact disconnects, normally closed interlock closure, main circuit normal power-up workman; When main circuit overload or short circuit duty, by the electric current increase of g sensor, make the gauge tap closure of g sensor, relay power, its normally open contact close platform, normally closed interlock disconnects, and cut off main circuit power.After overload or short trouble eliminating, click rest button, make the relay outage, normally open contact and normally closed interlock reset, and main circuit reenters operate as normal.

The utility model beneficial effect compared with prior art is that overload protecting circuit adopts independently power supply winding power supply; in case when main circuit overload or short circuit; the quick engage relay working power of g sensor; the normally closed contact of relay cuts off main circuit power; avoid the circuit elements components from being damaged, its protective value is good, reliable operation.

Fig. 1 is the electrical schematic diagram of the utility model overload protecting circuit.

Now further describe embodiment of the present utility model in conjunction with the accompanying drawings.Structure of the present utility model comprises that the teacher demonstrates master station and student experimenting platform, the teacher demonstrates master station by the adjustable power of alterating and direct current of 2--24V, 8A, 1.5--25V, the continuous adjustable D.C. regulated power supply of 3A, 9V, 40A time are 10S ± 2S high-current dc power supply, and 240V and 300V, 100mA high-voltage DC power supply are formed; The student experimenting platform is made up of the continuous adjustable power of alterating and direct current of 1.5--24V.Every group of direct supply is made up of transformer, rectification circuit, mu balanced circuit, regulating circuit and overload protecting circuit, and AC power is made up of transformer, regulating circuit and overload protecting circuit.Above-mentioned overload protecting circuit is made up of Transformer Winding W, rectification circuit, g sensor and relay J, the working coil of relay J with receive circuit output end of pressure-stabilizing, the normally opened contact J of relay J after the gauge tap of g sensor and rest button are connected ₁Be connected in parallel on the two ends of g sensor gauge tap, normally closed contact J ₂Be serially connected in the main circuit, as shown in Figure 1.Wherein g sensor is by tongue tube G and inductive coil W ₀Form inductive coil W ₀Be serially connected in the main circuit, by to inductive coil W ₀Appropriate design and the selection of tongue tube G, when the main circuit normal operating conditions, tongue tube G place off-state, when the main circuit overload, inductive coil W ₀The magnetic field that is produced makes tongue tube G closure.

Claims (2)

1; a kind of physics laboratory power console; comprise that the teacher demonstrates master station and student experimenting platform; the teacher demonstrates master station and student experimenting platform respectively by power transformer; rectification circuit; mu balanced circuit; regulating circuit and overload protecting circuit are formed; it is characterized in that described overload protecting circuit is by Transformer Winding (W); rectification circuit; mu balanced circuit; g sensor and relay (J) are formed; the working coil of relay (J) and the two ends of receiving the mu balanced circuit output voltage after the gauge tap of g sensor and rest button are connected, the normally opened contact (J of relay (J) ₁) be attempted by the two ends of g sensor gauge tap, normally closed contact (J ₂) be serially connected in the main circuit.

2, physics laboratory according to claim 1 power console is characterized in that described g sensor is by tongue tube (G) and inductive coil (W ₀) form inductive coil (W ₀) be serially connected in the main circuit.