CN202068334U

CN202068334U - Novel electronic transformer

Info

Publication number: CN202068334U
Application number: CN2011200595131U
Authority: CN
Inventors: 陈逢春
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-03-09
Filing date: 2011-03-09
Publication date: 2011-12-07
Anticipated expiration: 2021-03-09

Abstract

The utility model discloses a novel electronic transformer, comprising an AC power supply, a rectification circuit, an oscillation circuit, a trigger circuit, a push-pull switch circuit, an overload protection circuit, and a high frequency voltage reduction circuit, wherein the AC power supply, after being triggered by the rectification circuit, is connected to the oscillation circuit; the generated AC signals are output to the push-pull switch circuit and the trigger circuit respectively; the output of the push-pull switch circuit is made by the high frequency voltage reduction circuit; and the oscillation induction coil of the oscillation circuit and the primary coil of the high frequency output transformer of the high frequency voltage reduction circuit are wound around the same magnetic core, thereby integrating the oscillation circuit and the high frequency voltage reduction circuit into one body. When the electronic transformer is of zero load or the load thereof is miniwatt LED, the circuit can normally be operated.

Description

A kind of new type electronic transformers

Technical field

The utility model relates to a kind of electronic transformer.

Background technology

Popular in the market electronic lamp transformer is mainly used to drive low pressure (12V) based on halogen bulb, and still, (not connecing the low pressure halogen bulb) circuit is not worked when electronic transformer is unloaded, no-voltage output.And load can not normally start when too small.When inserting load and be low-power LED, the phenomenon of the cisco unity malfunction that will occur glimmering.

The utility model content

The purpose of this utility model just provides a kind of new type electronic transformers, and when electronic transformer zero load or load were low-power LED, circuit can both operate as normal.

The purpose of this utility model can realize by following technical scheme: a kind of new type electronic transformers, comprise AC power supplies, rectification circuit, oscillating circuit, circuits for triggering, push-pull type switching circuit, overload protecting circuit, high frequency voltage descending circuit, AC power supplies inserts oscillating circuit after rectifier and trigger, the AC signal that produces exports the push-pull type switching circuit respectively to, the push-pull type switching circuit becomes pulsating direct current into high-frequency current, is exported by the high frequency voltage descending circuit then; It is characterized in that: vibration induction coil PT1-2, PT3-4 in the oscillating circuit and the primary coil of the high-frequency output transformer PT in the high frequency voltage descending circuit realize that with on one group of magnetic core oscillating circuit and high frequency voltage descending circuit are one altogether.

The utility model also comprises driving and the accelerating circuit that is used for driving and quickening push-pull type switching circuit triode, comprises two diodes, two electric capacity, resistance, two induction coils; First diode is in parallel with string road, second diode three tunnel of second electric capacity with string road, the resistance of first electric capacity, the base stage of triode in the one termination push-pull type switching circuit of parallel circuits, the other end is by connecing the emitter of this triode with high-frequency output transformer (PT) with first induction coil on one group of magnetic core; What one of second induction coil was terminated at resistance and second electric capacity is connected in series some the emitter of another this triode of termination.

A kind of new type electronic transformers that the utility model provides is under the low-power LED situation in electronic transformer zero load or load, and circuit can both operate as normal.

Description of drawings

Fig. 1 is the theory of constitution block diagram of ordinary electronic transformer;

Fig. 2 is a theory of constitution block diagram of the present utility model;

Fig. 3 is the former line of reasoning of built-up circuit of the present utility model.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As shown in Figure 1, be the theory of constitution block diagram of ordinary electronic transformer, comprise AC power supplies, rectification circuit, oscillating circuit, circuits for triggering, push-pull type switching circuit, overload protecting circuit, high frequency voltage descending circuit.AC power supplies (220-240V/120V) becomes direct current behind rectification circuit, DC power supply exports circuits for triggering and push-pull type switching circuit respectively to through oscillating circuit, the signal triggering push-pull type switching circuit of circuits for triggering, the high-frequency current that the push-pull type switching circuit produces exports the high frequency voltage descending circuit to, by step-down, obtain required voltage and power.

As shown in Figure 2, be theory of constitution block diagram of the present utility model, comprise the combinational circuit of AC power supplies, rectification circuit, circuits for triggering, push-pull type switching circuit, overload protecting circuit, oscillating circuit and high frequency voltage descending circuit.The operation principle of new type electronic transformers is identical substantially with above-mentioned ordinary electronic transformer, its circuit feature is: the vibration induction coil in the oscillating circuit and the coil of the high-frequency output transformer in the high frequency voltage descending circuit realize that with on one group of magnetic core oscillating circuit and high frequency voltage descending circuit are one altogether.

As shown in Figure 3, be built-up circuit schematic diagram of the present utility model.

Wherein, the bridge rectifier bridge that rectification circuit is made up of diode D1-D4 is connected to insurance resistance F1 between AC power supplies and the rectifier bridge, and AC power supplies becomes direct current through rectification circuit, and dc output end is 2,4.

Resistance R 9, R8, capacitor C 11, C12, bidirectional trigger diode DB3 have constituted circuits for triggering, described resistance R 7, R8 series connection back and described capacitor C 12 are in parallel, parallel circuits one is terminated at dc power output end 2, the described capacitor C 11 of leading up to of the other end connects dc power output end 4, and another road connects the base stage of triode Q2 by described bidirectional trigger diode DB3.

The push-pull type switching circuit mainly is made up of triode Q1, Q2, and diode D7, D8, capacitor C 4, C5, resistance R 1, induction coil L2, PT1-2 constitute driving and the accelerating circuit of Q1; Diode D9, D10, capacitor C 6, C7, resistance R 2, induction coil L3, PT3-4 constitute driving and the accelerating circuit of Q2; The primary coil of the high-frequency output transformer in induction coil PT1-2, PT.3-4 and the high frequency voltage descending circuit is with on one group of magnetic core.Concrete connected mode is: the collector electrode of triode Q1 connects dc output end 2, and the emitter of Q1 directly links to each other with the collector electrode of Q2, and the emitter of Q2 connects dc output end 4.Diode D8 is in parallel with string road, the diode D7 of capacitor C 5 with string road, the resistance R 1 of capacitor C 4, one end of parallel circuits (anode of diode D7, D8) connects the base stage of triode Q4, and the other end connects the junction of the collector electrode of the emitter of triode Q1 and Q2 by induction coil PT1-2.What one of induction coil L2 was terminated at resistance R 1 and capacitor C 5 is connected in series some the junction of the emitter of another termination Q1 and the collector electrode of Q2.Diode D9, D10, capacitor C 6, C7, resistance R 2, induction coil L3, PT3-4 also adopt identical connected mode with triode Q2.

The high frequency voltage descending circuit mainly comprises high-frequency output transformer PT and electric capacity Y1, and the induction coil in the elementary and oscillating circuit of transformer PT is with on one group of magnetic core, and core shapes can be: ring-like, EI type, EE type.Transformer PT secondary connects load, and electric capacity Y1 is connected between the elementary and secondary like poles of transformer PT.

Triode Q3, field effect transistor Q4, voltage stabilizing didoe DZ1, diode D11, D12, resistance R 3, R4, R6, R7, capacitor C 10, C9, C8 constitutes overload protecting circuit.The anode of diode D11 connects being connected in series a little of resistance R 2 and capacitor C 7 in the push-pull type switching circuit, and the negative electrode of diode D11 connects the base stage of triode Q3 by resistance R 3.One termination transformer PT's of capacitor C 8 is elementary, other end connecting resistance R4, the other end of R4 connects the anode of dc output end 4 and diode D12 respectively by resistance R 5, an end that is connected the grid of field effect transistor Q4 and resistance R 6 and the parallel circuits of capacitor C 10 after the negative electrode of diode D12 and resistance R 7 serial connections simultaneously, one end of the other end of R6 and C10 and connection circuit, capacitor C 9 all is connected to dc output end 4, the negative electrode of another terminating diode D12 of capacitor C 9.Voltage stabilizing didoe DZ1 places between the emitter of Q3 and the collector electrode simultaneously and between the source electrode and grid of Q4, the emitter of Q3, the drain electrode of Q4 connect dc output end 4, and the collector electrode of Q3, the source electrode of Q4 connect the junction of capacitor C 11, C12.

Operation principle of the present utility model is: AC power supplies becomes direct current through rectification circuit, DC power supply is by resistance R 15, R16 is to capacitor C 11 chargings, when reaching the current potential that can trigger bidirectional diode DB3, the DB3 conducting, electric current flows into the base stage of triode Q2 by DB3, triode Q2 triggering and conducting, make electric current pass through the elementary of capacitor C 2 inflow transformer PT, this moment, induction coil L2 sensed a positive potential, add the base stage that positive electricity is pressed on triode Q1 by resistance R 1, triode Q1 triggering and conducting, and induction coil L3 senses an anti-phase current potential simultaneously, add the base stage that negative electricity is pressed on triode Q2 by resistance R 2, make triode Q2 by.Triode Q1 conducting, make current reversal flow through the elementary of transformer PT, at this moment, induction coil L2 obtains a negative potential, and induction coil L3 obtains a positive potential, triode Q1 by, and triode Q2 conducting so repeats, and produces high-frequency current, by step-down, at secondary acquisition required voltage and the power of transformer PT.During the load overload, the triode Q3 of overload protecting circuit or field effect transistor Q3 conducting form the loop by triode Q3 or field effect transistor Q4 behind direct current process resistance R 8, the R9, and two-way admittance diode DB3 does not work, and therefore can't trigger the push-pull type switching circuit.

Claims

1. new type electronic transformers, comprise AC power supplies, rectification circuit, oscillating circuit, circuits for triggering, push-pull type switching circuit, overload protecting circuit, high frequency voltage descending circuit, AC power supplies inserts oscillating circuit behind rectification circuit, the AC signal that produces exports push-pull type switching circuit and circuits for triggering respectively to, and the output of push-pull type switching circuit is exported behind the high frequency voltage descending circuit; It is characterized in that: the primary coil of the high-frequency output transformer (PT) in vibration induction coil in the oscillating circuit (PT1-2, PT3-4) and the high frequency voltage descending circuit realizes that with on one group of magnetic core oscillating circuit and high frequency voltage descending circuit are one altogether.

2. new type electronic transformers according to claim 1 is characterized in that: also comprise the driving and the accelerating circuit that are used for driving and quickening push-pull type switching circuit triode, comprise two diodes, two electric capacity, resistance, two induction coils; First diode is in parallel with string road, second diode three tunnel of second electric capacity with string road, the resistance of first electric capacity, the base stage of triode in the one termination push-pull type switching circuit of parallel circuits, the other end is by connecing the emitter of this triode with high-frequency output transformer (PT) with first induction coil on one group of magnetic core; What one of second induction coil was terminated at resistance and second electric capacity is connected in series some the emitter of another this triode of termination.