CN2259026Y - Low voltage, large current transformer - Google Patents

Abstract

The utility model discloses a transformer with low voltage and strong current. All components are installed on a circuit plate and are arranged in a casing (1). The utility model comprises a cooling plate (2), an electrical inductance input device L1 (3), a wave filtering capacitor C1 (4), a power tube N1 (5), a coupling capacitor C5 (6), a coupling capacitor C8 (7), a tine delaying capacitor C6 (8), an output transformer L7 (9) and a thick film block (11) which is manufactured by a drive circuit. Oscillator signals output by the drive circuit propel power tubes N1, N2 of an output circuit for coupling with the primary pole of a saturated magnetic transformer L7 with small size and the secondary pole inducts low voltage and strong current to drive load to work. A protection circuit is connected with the secondary role L6 of a sampling magnetic core; in the processes of open circuit with load and short circuit with load, the utility model can prevent transformers from being burnt out. Having the advantages of small size and high power factor, the utility model is suitable for illumination and electrical heating.

Description

A kind of low-voltage, strong current transformer

The utility model relates to a kind of low-voltage, strong current transformer, is a kind of electronics converting means of the devices such as heating that are used to throw light on or warm oneself.

Existing low-voltage, strong current transformer generally all adopt inductive-type transformer, and this transformer will use a large amount of enamelled wires and silicon steel sheet, and volume is big, and the material of consumption is many and magnetic hysteresis loss is also big.Though as electronics contravariant transformer can reduce volume adopting, economical with materials, power factor is low.Easily burn transformer when load open circuit or short circuit.

The purpose of this utility model is at above-mentioned shortcoming, design that a kind of volume is little, power factor is high, can save a large amount of copper materials and silicon steel sheet, have a new type electronic transformers of load open circuit and short-circuit protection function.

The utility model is achieved by the following scheme: mainly be made up of input circuit, drive circuit and output circuit, and add with protective circuit to realize load open circuit and short-circuit protection function.Input circuit is made up of F1, C1, L1, D1-D4, has the anti-jamming circuit that the drive circuit of feature is made up of C2, C4, R3, the circuits for triggering of forming by C3, D15, R2, by the Coplitts oscillator that R1, L2, L3, R4, L4 form, form by the stable operating point compensating circuit that D8, D9, D5, D6 form.Its output circuit is made up of power tube N1, N2 and D10, D11, D12, D13, C5, C6, C8 and magnetic saturation transformer L7, the magnetic core L5 that takes a sample.Output one end of drive circuit is that the common point of L2, D6, D15 and the base stage of output circuit power tube N2 are joined, and an end is that the common point of L3, D9 and the base stage of power tube N1 are joined, and the other end is the common point of L4 and L5.The additional protection circuit is made up of the secondary L6 of sampling magnetic core, pressurizer Z1, adjustable resistance P1, unidirectional controllable silicon S 1 and C7, R5; the common point of the anode of its S1 and N2, D6, L2 joins; the negative electrode of S1 and reference ground join, and the control utmost point of S1 joins by R5, P1 and D14.

The utility model is coupled to the method for magnetic saturation primary owing to adopted the oscillator signal that drive circuit is produced to promote two power tube alternations in circuit, obtained required low-voltage, big electric current.Used magnetic saturation transformer has only 3cm ³About, need not use a large amount of copper materials and silicon steel sheet, curable again one-tenth one thick film circuit of drive circuit, volume reduces greatly, reliable operation.The utility model volume is little, in light weight, power factor is high, and has load open circuit and short-circuit protection, and very high use value is arranged.

Below in conjunction with accompanying drawing the utility model is illustrated:

Fig. 1-Fig. 2 is embodiment of the utility model.Wherein Fig. 1 is a structure chart of the present utility model, and Fig. 2 is a line map of the present utility model.

As shown in Figure 1, all components and parts are all installed in the shell (1) of packing in the circuit board.Thick film piece (11), attaching plug (12), output plug (13) comprising the system of heating panel (2), input inductance L1 (3), filter capacitor Cl (4), power tube N1 (5), coupling capacitance C5 (6), coupling capacitance C8 (7), delay capacitor C6 (8), output transformer L7 (9), fusible link F1 (10), drive circuit.

Input circuit is by C1, L1, F1 and rectification D1-D4 form, drive circuit is by C2, C4, the anti-jamming circuit that R3 forms, by C3, R2, the circuits for triggering that D15 forms reach by R1, L2, L3, R4, the Coplitts oscillator that L4 forms, by D8, D9, D5, the stable operating point compensating circuit that D6 forms is formed, R2, C3, D15, circuits for triggering and bikini oscillator L4 that D7 forms, L2, R1, L3, R4 joins, its output passes through L2, D15, the common point of D6, D9, the common point of L3 and L4 and output circuit join, the oscillator signal of being exported, promote two power tube N1 of output circuit, the N2 alternation, through capacitor C 5, C8 is coupled to output transformer L7, arrives low-voltage at the L7 secondary induction, big electric current drives loaded work piece.Output circuit is made up of N1, N2, D10, D11, D12, D13 and C5, C6, C8, L5, L7, and L5 is elementary for the sampling magnetic core, and Coplitts oscillator and L4 join in an end and the drive circuit, and the elementary L7 of the other end and magnetic saturation transformer joins.The common point of the D12 of output circuit, D13, C6, C8, D5, R1 and reference ground join.

Protective circuit comprises that secondary L6, adjustable resistance P1, D14, Z1, R5, C7, the unidirectional silicon S1 of the magnetic core of taking a sample form; the common point of S1 plate and D5, D13, D12, C7 joins; the common point of the other end of S1 and the base stage of N2, D6, L2, D15 joins; Z1 is a voltage stabilizing didoe; play clamping action, make the sampling voltage of protective circuit a bigger voltage difference be arranged between the two in operate as normal.The work of protective circuit is as follows: when load open circuit, circuit is non-loaded and vibration raises, and the elementary L5 voltage of the magnetic core of taking a sample this moment raises; secondary L6 also has high voltage; this voltage is sent into S1 and is made its conducting after the D14 rectification, so the base stage of power tube N2 is short-circuit ground, vibration stops no-output.If during load short circuits, L5 has bigger electric current to pass through, and the pressure drop of electric current on adjustable resistance P1 on this moment L6 increases, then also conducting of S1, the base stage short circuit ground connection of N2, N2 dead-beat no-output.Can keep conducting state owing to S1 after the protective circuit work, thereby circuit is in the failure of oscillation state all the time.Only after fixing a breakdown, restart power supply, circuit could be worked.Wherein the delay circuit of C7, R5 composition can prevent the protective circuit misoperation.

Claims (2)

1, a kind of low-voltage, strong current transformer, comprise input circuit (F1, C1, L1, D1-D4), it is characterized in that above-mentioned transformer mainly is made up of drive circuit and output circuit, drive circuit is by C2, C4, the anti-jamming circuit that R3 forms, by C3, D15, the circuits for triggering that R2 forms, by R1, L2, L3, R4, the Coplitts oscillator that L4 forms, by D8, D9, D5, the stable operating point compensating circuit that D6 forms is formed, output circuit is by power tube N1, N2 and D10, D11, D12, D13, C5, C6, C8 and magnetic saturation transformer L7, sampling magnetic core L5 forms, output one end of drive circuit is L2, D6, the base stage of the common point of D15 and output circuit power tube N2 is joined, one end is L3, the base stage of the common point of D9 and power tube N1 is joined, and the other end is the common point of L4 and L5.

2, a kind of low-voltage according to claim 1, strong current transformer; it is characterized in that above-mentioned transformer is also additional by a protective circuit of being made up of the secondary L6 of sampling magnetic core, pressurizer Z1, adjustable resistance P1, unidirectional controllable silicon S 1 and C7, R5; the common point of the anode of its S1 and N2, D6, L2 joins; the negative electrode of S1 and reference ground join, and the control utmost point of S1 joins by R5, P1 and D14.

Images