CN2894065Y

CN2894065Y - Domestic water purifier external electric source

Info

Publication number: CN2894065Y
Application number: CN 200620023783
Authority: CN
Inventors: 曹静明
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-03-16
Filing date: 2006-03-16
Publication date: 2007-04-25
Anticipated expiration: 2016-03-16

Abstract

The utility model relates to a power device, to be precise, an external power for the household pure water machine. The utility model solves the problems such as the power for the present pure water machines is all internally positioned and the external power is complex in structure and low in efficiency. The external power for the household pure water machine comprises a shell and an internal circuit which comprises a rectification circuit, a transformer T1, and a FETQ1. A primary coil of the transformer T1 is connected in series with the FET Q1, the grid of which is connected with the on-off control circuit centered on the PWM integrated chip that can generate pulse signal. A secondary coil of the transformer T1 can output direct current after waves filtering rectifier, and the other secondary coil of the transformer T1 can provide maintaining voltage for the PWM integrated chip. The power is reasonable in design, simple, small in size and highly efficient in the transformation between the alternating current and the direct current, which can improve the operating efficiency and stability of the household pure water machine and lighten the total weight of the machine.

Description

Domestic water purifying machine external power supply

Technical field

The utility model relates to a kind of supply unit, is specially domestic water purifying machine external power supply.

Background technology

The power supply of existing domestic water purifying machine all is built-in, has not only increased the weight of water purification machine, and has used unsafe.Though the external power supply of multiple structure is arranged at present, circuit structure relative complex mostly, efficient is lower.

Summary of the invention

It all is built-in power supply that the utility model solves existing water purification machine, and problem such as existing external power supply architecture complexity, efficient be lower provides a kind of domestic water purifying machine external power supply.

The utility model is to adopt following technical scheme to realize: domestic water purifying machine external power supply, comprise housing and internal circuit, internal circuit comprises rectification circuit, transformer T1, field effect transistor Q1, the series arm of the primary coil of transformer T1, the drain electrode of field effect transistor Q1 and source electrode, resistance R 4 is connected in the direct current output two ends of rectification circuit, the grid of field effect transistor Q1 links to each other with the switching control circuit that with the PWM integrated chip that produces pulse signal is core, and the secondary coil of transformer T1 is connected in series with rectifier diode D7, in parallel with filter capacitor C19.The PWM integrated chip need have conventional power supply circuits, its each line end is connected with operate as normal peripheral circuit necessary, that be formed by connecting by resistance, electric capacity, these power supply circuits and peripheral circuit are known to those skilled in the art, and promptly those skilled in the art just know how to connect power supply circuits and peripheral circuit when using the PWM integrated chip.During work, the AC side energising of rectification circuit, direct current output two ends output DC, PWM integrated chip output pulse signal, the alternating state that field effect transistor Q1 is in conducting, ends, the primary coil of transformer T1 flows through pulsating current, thereby goes out alternating voltage, produces alternating current at the secondary induction of transformer T1, output DC after diode D7 rectification, capacitor C 19 filtering, another secondary coil feedback provides to the PWM integrated chip keeps supply power voltage.

Domestic water purifying machine external circuit construction of electric power described in the utility model is reasonable in design, simple, volume is little, working stability, reliable, the efficient height of AC and DC conversion.It has improved the water purification machine traveling comfort as the operational efficiency of external power supply to domestic water purifying machine power supply raising domestic water purifying machine, has alleviated the weight of water purification machine complete machine.Add the fail safe and the convenience that has just strengthened its use greatly of setting up of master switch.This power volume is little in light weightly to be convenient to externally, and the outer postpone of power supply is operated in 24V voltage under the domestic water purifying machine complete machine and works, and has thoroughly eliminated potential safety hazard.

Description of drawings

Fig. 1 is a surface structure schematic diagram of the present utility model;

Fig. 2 is the internal circuit schematic diagram;

Embodiment

Domestic water purifying machine external power supply, comprise housing 1 and internal circuit, internal circuit comprises rectification circuit (employing diode bridge rectifier circuit), transformer T1, field effect transistor Q1, the primary coil of transformer T1, the drain electrode of field effect transistor Q1 and source electrode, the series arm of resistance R 4 is connected in the direct current output two ends of rectification circuit, the grid of field effect transistor Q1 be the logical of core with the PWM integrated chip that produces pulse signal, disconnected control circuit links to each other, the direct current output two ends of rectification circuit are connected with resistance R 2, the series arm of the parallel branch of capacitor C 12 and capacitor C 26, the power input of PWM integrated chip and capacitor C 12, the positive terminal of C26 links to each other, finish the power supply of PWM integrated chip with this, the signal output part of PWM integrated chip links to each other through the grid of resistance R 3 with field effect transistor Q1, the secondary coil of transformer T1 is connected in series with rectifier diode D7, C19 is in parallel with filter capacitor, one end of another secondary coil of transformer T1 links to each other with the power input of PWM integrated chip with rectifier diode D3 series connection back, finishes the power supply of keeping of PWM integrated chip with this.For safer, easily to domestic water purifying machine power supply, be serially connected with K switch in the AC side of rectification circuit.Transformer T1 primary current flows between the drain electrode of end and field effect transistor Q1 and is connected with resistance R 1 and capacitor C 1 absorption branch road in parallel, that constitute with diode D2 differential concatenation again, when Alternating Current Power Supply raises because of fluctuation voltage, diode D2 is reversed conducting and realizes shunting (alternating supply voltage reduces back diode D2 and recovers blocking-up), thereby guarantees that more stable direct current output is arranged.The Alternating Current Power Supply of this external power supply can be between 110-240V.

During work, K closes a switch, the AC side energising of rectification circuit, direct current output two ends output DC, the Zhi Luxiang PWM integrated chip power supply that constitutes through resistance R 2 and capacitor C 12, C26, PWM integrated chip output pulse signal, the alternating state that field effect transistor Q1 is in conducting, ends, the primary coil of transformer T1 flows through pulsating current, thereby the secondary induction at transformer T1 goes out alternating voltage, produces alternating current, output DC after diode D7 rectification, capacitor C 19 filtering, another secondary coil feedback provides to the PWM integrated chip keeps supply power voltage.

Claims

1, a kind of domestic water purifying machine external power supply, comprise housing (1) and internal circuit, internal circuit comprises rectification circuit, transformer T1, field effect transistor Q1, it is characterized by: the series arm of the primary coil of transformer T1, the drain electrode of field effect transistor Q1 and source electrode, resistance R 4 is connected in the direct current output two ends of rectification circuit, the grid of field effect transistor Q1 links to each other with the switching control circuit that with the PWM integrated chip that produces pulse signal is core, and the secondary coil of transformer T1 is connected in series with rectifier diode D7, in parallel with filter capacitor C19.

2, domestic water purifying machine external power supply as claimed in claim 1, it is characterized by: the AC side at rectification circuit is serially connected with K switch.

3, domestic water purifying machine external power supply as claimed in claim 1 or 2 is characterized by: transformer T1 primary current flows between the drain electrode of end and field effect transistor Q1 and is connected with resistance R 1 and capacitor C 1 absorption branch road in parallel, that constitute with diode D2 differential concatenation again.