CN2167475Y

CN2167475Y - Frequency-changing starting type dc-to-ac converting power source

Info

Publication number: CN2167475Y
Application number: CN 93234574
Authority: CN
Inventors: 李卫阳
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-27
Filing date: 1993-08-27
Publication date: 1994-06-01
Anticipated expiration: 2003-08-27

Abstract

The utility model discloses a variable frequency starting type inverter which changes direct-current power input to alternating current power output. The utility model is composed of a frequency conversion oscillation circuit (1), a power drive circuit (2) and a direct-current power supply (3). The utility model starts the inductive load of motors by taking the variable frequency ac voltage of which frequency raises from low to top, reduces starting power, can reduce to the 30%-50% of an ordinary transistor inverse power supply, saves electric energy, lowers the manufacturing cost of a complete machine, reduces the volume of the complete machine, and is in convenient for transportation and placing. The utility model can be used as an inversion charger through improving.

Description

Frequency-changing starting type dc-to-ac converting power source

The utility model relates to and a kind ofly irreversiblely changes direct current power input the inverter power supply device of AC power output into, further is meant a kind of varying frequency starting formula inverter that adopts semiconductor device.

Common inverter is when using motor and so on inductive load (as the compressor of refrigerator), because the transient starting power requirement of motor is very big, the 10-20 that generally is about rated power doubly, so necessary adapted 10-20 could be reliably with load starting doubly to the inverter of bearing power.So, just make the inverter manufacturing cost increase, volume increases, and when starting power hungry.

The purpose of this utility model, but be to provide a kind of with the varying frequency starting formula inverter of smaller power with regard to actuating motor and so on inductive load.

Referring to Fig. 1 the utility model electricity functional-block diagram, solution of the present utility model is as follows.Its circuit part is made up of oscillation inverter circuit (1), power driving circuit (2) and DC power supply (3), the output of oscillation inverter circuit (1) links to each other with the input of power driving circuit (2), and the voltage output end of DC power supply (3) joins with the power end of oscillation inverter circuit (1) and power driving circuit (2) respectively.

The utility model with foregoing circuit structure is connected on motor and so on inductive load the output of power driving circuit (2) when work.Its operation principle is, oscillation inverter circuit (1) produces a frequency by the low oscillator signal that is elevated to normal value, remove power controlling drive circuit (2) with this oscillation inverter signal, export a frequency by the low ac output voltage that is elevated to normal value by power driving circuit (2), this alternating voltage is in the process of actuating motor and so on inductive load, because its frequency raises towards normal value from being significantly less than normal value, so average starting power also is significantly less than the starting power of common inverter, but reached the starting purpose equally, reliably starting duty.

The frequency conversion voltage that the utility model takes to be lower than normal value comes the inductive load of actuating motor and so on, make starting power generally can be reduced to the 30%-50% of common inverter, thereby saved electric energy, reduced the components and parts cost, particularly reduced the cost of transformer and semiconductor device, make also that simultaneously the volume of complete machine dwindles relatively, help transporting and laying.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model electricity functional-block diagram;

Fig. 2 is the schematic diagram of a kind of physical circuit of Fig. 1 block diagram.

Referring to Fig. 2, oscillation inverter circuit (1) is by triode T ₁With T ₂, K switch ₁, resistance R ₁To R ₇And capacitor C ₁To C ₃Form, power driving circuit (2) is by transistor T ₃To T ₈, resistance R ₈To R ₁₃And transformer B composition, DC power supply (3) is by battery E and K switch ₂Be in series the triode T of oscillation inverter circuit (1) ₁And T ₂Collector electrode join with the two ends of transformer B primary coil respectively, the centre cap of transformer B primary coil passes through K switch ₂Link to each other with the positive pole of battery E.

Oscillation inverter circuit (2) among Fig. 2 is actually one by using R ₇With C ₃The integral voltage that forms is controlled the base stage timing multivibrator that its frequency of oscillation is done variation from low to high, from triode T ₁And T ₂The opposite polarity oscillation inverter signal of output is at K ₁Under the closed situation, again respectively through T ₃To T ₅And T ₆To T ₈After two groups of power amplification circuits are recommended amplification, in the centre tapped primary coil of being with of transformer B, form opposite polarity frequency conversion voltage signal, after transformer B transformation, do all-wave output from its secondary winding.

Referring to Fig. 2, if between the two ends of the utility model transformer B primary coil and battery E negative pole, be connected diode D respectively ₁And D ₂, then the utility model also can be used as the use of inversion charger.Only need K switch this moment ₁Disconnect, and introduce the 220V alternating voltage from the secondary coil of transformer B, then the alternating voltage of the elementary output of transformer B is through D ₁And D ₂Do full-wave rectification, just can charge battery E.

Claims

1, a kind of varying frequency starting formula inverter, it is characterized in that, circuit part is made up of oscillation inverter circuit (1), power driving circuit (2) and DC power supply (3), the output of oscillation inverter circuit (1) links to each other with the input of power driving circuit (2), and the voltage output end of DC power supply (3) joins with the power end of oscillation inverter circuit (1) and power driving circuit (2) respectively.

2, varying frequency starting formula inverter as claimed in claim 1 is characterized in that, oscillation inverter circuit (1) is by triode T ₁With T ₂, K switch ₁, resistance R ₁To R ₇And capacitor C ₁To C ₃Form, power driving circuit (2) is by transistor T ₃To T ₈, resistance R ₈To R ₁₃And transformer B composition, DC power supply (3) is by battery E and K switch ₂Be in series the triode T of oscillation inverter circuit (1) ₁And T ₂Collector electrode join with the two ends of transformer B primary coil respectively, the centre cap of transformer B primary coil passes through K switch ₂Link to each other with the positive pole of battery E.

3, varying frequency starting formula inverter as claimed in claim 2 is characterized in that, is connected to diode D respectively between the two ends of transformer B primary coil and battery E negative pole ₁And D ₂