CN2245293Y - Miniature charging power supply - Google Patents

Abstract

The utility model relates to a miniature power supply for charging a portable charged lamp. The utility model comprises a rectification circuit and a self-excited oscillation circuit. The self-excited oscillation circuit adopts a magnetic transformer composed of three windings. The utility model has the advantages of small size, less elements, convenient fabrication, low cost, etc., and is suitable for various portable charged lamps.

Description

Miniature charge power supply

The utility model relates to a kind of charge power supply of the bottle charging of powering, and is mainly used in the charging of portable rechargeable lamp.

Existing portable rechargeable lamp because can use by recharge, quite is subjected to people's welcome.But for the charge power supply of portable rechargeable lamp charging,,, portably use equal inconvenience at present, more be not suitable for rechargeable lamp integrated supporting so volume is bigger because wherein adopted appendiron core transformer.

The purpose of this utility model is that a kind of improved miniature charge power supply will be provided, and its volume is little, portably uses conveniently.

The purpose of this utility model is achieved in that it comprises a rectification circuit and a self-maintained circuit, has adopted the magnetic transformer that is made of three windings in the self-maintained circuit.The self-maintained circuit element is few, and particularly the volume of magnetic transformer is little, thereby the volume of whole power supply can be processed into 20mm ³About.

The utility model is owing to adopt the self-maintained circuit that contains magnetic transformer, and not only volume is little, and element is few, makes simply, and cost is low, and good stability is applicable to existing various portable rechargeable lamp.

Fig. 1 is the circuit theory diagrams of miniature charge power supply.

Do further specifying of embodiment below in conjunction with accompanying drawing: the utility model comprises a rectification circuit (1) and a self-maintained circuit (2), and rectification circuit is by two pipe D ₁, D ₂, D ₃, D ₄And resistance R ₁, R ₂, capacitor C ₁, light-emitting diode D ₅Constitute; Self-maintained circuit contains one by winding L ₁, L ₂, L ₃Magnetic transformer B and two triode T of constituting ₁, T ₂, T ₁Base stage by thermistor R ₄, resistance R ₃Resistance R with rectification circuit ₂Link to each other the L of magnetic transformer ₁With capacitor C ₂Be connected on T after the parallel connection ₁Collector electrode and R ₃Between, L ₂One end connects the capacitor C of rectification circuit ₁, and pass through resistance R ₆With T ₁Emitter links to each other, and the other end passes through capacitor C ₃, resistance R ₅Be connected in R ₃And R ₄Between, L ₃Be output, wherein series diode D on the end ₆, T ₂Base stage be connected in T ₁Emitter and R ₅Between, collector electrode is connected in R ₃, R ₄Between, emitter is connected in R ₅With C ₁Between.Operation principle is as follows: the 220V alternating voltage is through D ₁～D ₄Rectification and capacitor C ₁After the filtering, because of resistance R ₂Current limliting, 3 direct voltages that obtain about 300V, and pass through resistance R ₃To triode T ₁Base stage provide starting current, T ₁The beginning conducting, electric current is from L ₁Flow through, simultaneously L ₂Produce induced current, pass through capacitor C ₃, resistance R ₅Again to T ₁The base stage injection current causes collector current to become big, simultaneously L ₃By diode D ₆Charge to the load power output.Work as T ₁Collector current equals multiplication factor when taking advantage of base current, T ₁Put the multiple deficiency, collector current descends, L ₂The also corresponding decline of electric current, base current is not enough and fast ending, capacitor C ₂To prevent T ₁The moment that ends, the reverse potential reverse breakdown T that transformer B produces ₁

In use, for preventing unloaded operation, at L ₃Two ends piezo-resistance RV preferably in parallel, to make no-load protection.In addition, on self-maintained circuit (2), be connected to a triode T ₂, like this, when load during excessive or short circuit, T ₁Electric current can increase resistance R ₆The corresponding rising of the voltage at two ends, T ₂With regard to conducting, T ₁Base voltage can descend thereupon, plays protection T ₁Effect.

Claims (2)

1. miniature charge power supply, this power supply comprises a rectification circuit (1) and self-maintained circuit (2), it is characterized in that described self-maintained circuit contains one by winding L ₁, L ₂, L ₃The magnetic transformer B and the triode T that constitute ₁, T ₂, T ₁Base stage by thermistor R ₄, resistance R ₃Resistance R with rectification circuit ₂Be connected the L of magnetic transformer ₁With capacitor C ₂Be serially connected in T after the parallel connection ₁Collector electrode and R ₃Between, L ₂One end connects the capacitor C of rectification circuit ₁, and pass through resistance R ₆With T ₁Emitter links to each other, and the other end passes through capacitor C ₃, resistance R ₅Be connected in R ₃And R ₄Between, L ₃Be output, wherein series diode D on the end ₆T ₂Base stage be connected in T ₁Emitter and R ₆Between, collector electrode is connected in R ₃, R ₄Between, emitter is connected in R ₆With C ₁Between.

2. miniature charge power supply as claimed in claim 1 is characterized in that the L of described magnetic transformer B ₃Two ends piezo-resistance RV in parallel.