CN201956907U

CN201956907U - Dual-bridge oscillation electronic transformer with DC low voltage power supply

Info

Publication number: CN201956907U
Application number: CN2011201106471U
Authority: CN
Inventors: 阮小青; 阮树成
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-03
Filing date: 2011-04-03
Publication date: 2011-08-31
Anticipated expiration: 2021-04-03

Abstract

The utility model relates to the technical field of electronics, and discloses a dual-bridge oscillation electronic transformer with a DC low voltage power supply. The transformer consists of two bridge oscillators, an addition coupler, a high-power metal oxide semiconductor (MOS) field effect tube full-wave rectification circuit, an overcurrent detection protection circuit and the DC low voltage power supply, wherein the two bridge oscillators are connected to the high-power MOS field effect tube full-wave rectification circuit in a synthesis way, and outputs DC voltage for a load. The transformer has a unique and highly-efficient circuit, and is widely used for high-power light emitting diode (LED) lamp illumination, visual quality and advertisement in occasions such as automobiles, trains, metros and ships without AC mains supply or convenient power supply.

Description

Dc low voltage power supply doube bridge oscillating electron transformer

Technical field

The utility model relates to electronic technology field, specifically is a kind of Dc low voltage power supply doube bridge oscillating electron transformer.

Background technology

Can supply or the open-air inconvenient occasion of leisure power supply of encamping at automobile, train and not have electric main of ship, adopt storage battery Dc low voltage power supply LED light emitting diode matrix lamp can produce bright light source, the photoelectric conversion efficiency height, light is soft pleasant, easy to use, life-span is long, and is widely used in view and advertisement.Yet, it is big to drive large-power light-emitting diodes led array lamp inverter current, require vibration output high-power, electric current just must increase when operating voltage was low, and therefore, big current oscillation triode power consumption temperature rise causes that the pipe electric current and voltage changes, heavy current warming also makes coil magnetic permeability decline inductance value reduce simultaneously, serious generation saturation inductors becomes very little, and then influences light tube electric voltage and electric current change, lamp luminescence brightness instability.Very easily burn out device.

Summary of the invention

The purpose of this utility model provides the Dc low voltage power supply power supply, drags a kind of Dc low voltage power supply doube bridge oscillating electron transformer of high power load.

The utility model technical solution is: by two bridge-type oscillators; the addition coupler; high-power MOS field effect transistor full-wave rectifying circuit; overload detection protective circuit Dc low voltage power supply is formed; two bridge-type oscillators are divided into bridge-type oscillator 5a and bridge-type oscillator 5b; respectively by ferrimagnetism transformer T1; T2 primary inductance shunt capacitance is a resonant tank; the resonant tank two ends respectively and connect two high-power oscillating tube collector electrodes of PNP and two high-power oscillating tube collector electrodes of NPN; two high-power oscillating tube emitters of PNP connect the Dc low voltage power supply positive pole; two high-power oscillating tube grounded emitters of NPN; complementary series feed power supply; fast recovery diode in parallel between four high-power oscillating tube collector electrodes and the emitter; resonant tank two ends cross-couplings also in parallel is to pipe base resistance quiescent biasing and electric capacity positive feedback are constituted bridge-type oscillator; two high-power oscillating tube base stages of NPN also connect control signal mouthpiece collector electrode; the mouthpiece base stage; collector electrode connects voltage negative feedback biasing resistor; grounded emitter; bridge-type oscillator 5a and bridge-type oscillator 5b power output are synthetic by ferrimagnetism transformer T1 and the anti-phase access addition of T2 secondary inductance coupler power respectively; bridge-type oscillator 5a and bridge-type oscillator 5b are through the synthetic high-power MOS field effect transistor full-wave rectifying circuit that inserts of addition coupler power; output dc voltage is for load; the overload detection protective circuit through magnet ring inductance induced potential diode detection, detects voltage access interface management and control system oscillating tube by load current.

Wherein, high-power MOS field effect transistor full-wave rectifying circuit is made of two high-power MOS field effect transistor, switching diode and resistance, two high-power MOS field effect transistor source electrodes insert the two ends of addition coupler secondary inductance respectively, inductance centre cap ground connection, gate bias resistor is connected across grid, leaks two ends, grid is through the two ends of switching diode parallel resistance intersection access addition coupler secondary inductance, and two pipe drain electrodes also are connected into the full-wave rectification output dc voltage.

The utility model produces useful good effect: the output of Dc low voltage power supply power supply doube bridge hunting power synthesizing efficient, it is very strong to vibrate.The complementary series feed power supply of oscillating circuit, the high electric current of supply voltage is little, reduces power consumption and increases power output.Not only efficient, opposite three rank of collector current phase place and high-order odd harmonic are zero, and even-order harmonic is cancelled out each other, and is output as pure sine wave, and the full-wave rectification of high-power MOS field effect transistor is without electrochemical capacitor filtering, and the internal resistance low-response is fast.Be widely used in the occasion DC-DC conversion that does not have electric main or power supply inconvenience, especially be fit to drive large-power light-emitting diodes LEC array.

Description of drawings

Fig. 1 technical solutions of the utility model functional-block diagram.

Fig. 2 bridge-type oscillator circuit.

Fig. 3 doube bridge oscillator power combiner circuit.

Field effect transistor full-wave rectification of Fig. 4 high-power MOS and overload detection protective circuit.

Embodiment

With reference to Fig. 1; 2 and Fig. 3 (Fig. 2 is an example with bridge-type oscillator 5a circuit; bridge-type oscillator 5b circuit is identical); the utility model specific implementation method and embodiment: two bridge-type oscillators 5; addition coupler 4; high-power MOS field effect transistor full-wave rectifying circuit 3; overload detection protective circuit 2 and Dc low voltage power supply 1 are formed; two bridge-type oscillators 5 are divided into bridge-type oscillator 5a; bridge-type oscillator 5b; respectively by ferrimagnetism transformer T1; T2 primary inductance L1 shunt capacitance C0 is a resonant tank; the resonant tank two ends respectively and meet two high-power oscillating tube Q1 of PNP; Q2 collector electrode and two high-power oscillating tube Q3 of NPN; the Q4 collector electrode; two high-power oscillating tube Q1 of PNP; the Q2 emitter connects Dc low voltage power supply 1 positive pole; two high-power oscillating tube Q3 of NPN; the Q4 grounded emitter; complementary series feed power supply; four high-power oscillating tube Q1; Q2 and Q3; fast recovery diode VD1 in parallel between Q4 collector electrode and the emitter; VD2 and VD3; VD4; resonant tank two ends cross-couplings also in parallel arrives pipe base resistance R1; R2 and R3; R4 quiescent biasing and capacitor C 1; C2 and C3; the C4 positive feedback constitutes bridge-type oscillator; two high-power oscillating tube Q3 of NPN; the Q4 base stage also meets control signal mouthpiece Q5; the Q6 collector electrode; mouthpiece Q5; the Q6 base stage; collector electrode meets voltage negative feedback biasing resistor R5; R6; grounded emitter; bridge-type oscillator 5a and bridge-type oscillator 5b power output are synthetic by ferrimagnetism transformer T1 and the anti-phase access addition of T2 secondary inductance L2 coupler 4 power respectively, and bridge-type oscillator 5a and bridge-type oscillator 5b supply load through synthetic high-power MOS field effect transistor full-wave rectifying circuit 3 output dc voltages that insert of addition coupler 4 power.

Fast recovery diode VD1, VD2 and VD3, VD4 protection oscillating tube are avoided high back-pressure and are punctured.

Bridge-type oscillator is by PNP, two symmetrical capacitance-resistance cross-couplings of complementation of NPN triode push-pull oscillator mutual coupling forms, the push-pull oscillator of capacitance-resistance cross-couplings is actual to be the directly continuous two-stage LC frequency selective amplifier of output input, high-power oscillating tube Q1, Q2 and Q3, the Q4 angle of flow is 90 degree alternations, output current is half cosine wave pulse, it is very strong to vibrate, through resonant tank decay harmonic wave, opposite three rank of collector current phase place and high-order odd harmonic are zero, even-order harmonic is cancelled out each other, make load be output as pure sine wave, not only efficient, complementary series feed power supply, the high electric current of supply voltage is little, and power output low in energy consumption is big.

General large power triode formation bridge-type vibration power output can only be mated the load about 60W, when requiring bigger power output such as 120W load, only several the direct parallel operations of device can not be satisfactory, the synthetic stack of doube bridge hunting power power output effect is obvious, by the addition coupler with the doube bridge mutual anti-phase excitation of power output of vibrating, two output current conversion double summation and deliver to load, and these two electric currents are flowed through balance resistance R9 when equating, no power waste.

Fig. 4, high-power MOS field effect transistor full-wave rectifying circuit is by two high-power MOS field effect transistor Q7, Q8 full-wave rectification, source electrode inserts the two ends of addition coupler 4 secondary inductance respectively, inductance centre cap ground connection, grid inserts the two ends of addition coupler secondary inductance through switching diode VD5, VD6 parallel resistance R11, R13 intersection, and provide gate bias with resistance R 10, R12, switching diode VD5, VD6 make grid quicken upset, drain electrode also is connected into full-wave rectification output dc voltage supply load RL, rectification circuit is without electrochemical capacitor filtering, and response is fast.This electronic transformer output dc voltage, power are determined by doube bridge oscillator and the primary and secondary inductance ratio of addition coupler and supply voltage, electric current.

Overload detection protective circuit 2 by load current through magnet ring inductance L 3 induced potential diode VD7 peak detections; detect voltage through capacitor C 5 filtering, resistance R 7, R8 current limliting access interface pipe Q5, Q6 control oscillating tube Q3, Q4 and Q1, Q2; when load short circuits or loose contact produce big electric current; detect voltage and make Q5, Q6 saturation conduction; oscillating tube Q3, Q4 and Q1, Q2 play a protective role immediately by failure of oscillation.

Embodiment Dc low voltage power supply voltage 48V, doube bridge oscillator electric current 2.9A, frequency 51KHZ, output dc voltage 12V, electric current 10A, coupling 120W LED array lamp, inversion efficiency 85%.

The utility model is widely used in the occasion DC-DC conversion that does not have electric main or power supply inconvenience, and the full-wave rectification of high-power MOS field effect transistor is without electrochemical capacitor filtering, and the internal resistance low-response is fast.Be fit to drive large-power light-emitting diodes LEC array lamp or drive other dc electric apparatus.

Claims

1. Dc low voltage power supply doube bridge oscillating electron transformer; it is characterized in that: by two bridge-type oscillators; the addition coupler; high-power MOS field effect transistor full-wave rectifying circuit; overload detection protective circuit Dc low voltage power supply is formed; two bridge-type oscillators are divided into bridge-type oscillator (5a) and bridge-type oscillator (5b); respectively by ferrimagnetism transformer (T1); (T2) the primary inductance shunt capacitance is a resonant tank; the resonant tank two ends respectively and connect two high-power oscillating tube collector electrodes of PNP and two high-power oscillating tube collector electrodes of NPN; two high-power oscillating tube emitters of PNP connect the Dc low voltage power supply positive pole; two high-power oscillating tube grounded emitters of NPN; complementary series feed power supply; fast recovery diode in parallel between four high-power oscillating tube collector electrodes and the emitter; resonant tank two ends cross-couplings also in parallel is to pipe base resistance quiescent biasing and electric capacity positive feedback are constituted bridge-type oscillator; two high-power oscillating tube base stages of NPN also connect control signal mouthpiece collector electrode; the mouthpiece base stage; collector electrode connects voltage negative feedback biasing resistor; grounded emitter; bridge-type oscillator (5a) and bridge-type oscillator (5b) power output are respectively by ferrimagnetism transformer (T1); (T2) the anti-phase access addition of secondary inductance coupler power is synthetic; bridge-type oscillator (5a) and bridge-type oscillator (5b) are through the synthetic high-power MOS field effect transistor full-wave rectifying circuit that inserts of addition coupler power; output dc voltage is for load; the overload detection protective circuit through magnet ring inductance induced potential diode detection, detects voltage access interface management and control system oscillating tube by load current.

2. Dc low voltage power supply doube bridge oscillating electron transformer according to claim 1, it is characterized in that: high-power MOS field effect transistor full-wave rectifying circuit is made of two high-power MOS field effect transistor, switching diode and resistance, two high-power MOS field effect transistor source electrodes insert the two ends of addition coupler secondary inductance respectively, inductance centre cap ground connection, gate bias resistor is connected across grid, leaks two ends, grid is through the two ends of switching diode parallel resistance intersection access addition coupler secondary inductance, and two pipe drain electrodes also are connected into the full-wave rectification output dc voltage.