CN2465218Y

CN2465218Y - Double-way dc voltage-stabilizing source

Info

Publication number: CN2465218Y
Application number: CN 00252087
Authority: CN
Inventors: 张继春
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-11-22
Filing date: 2000-11-22
Publication date: 2001-12-12
Anticipated expiration: 2010-11-22

Abstract

The utility model discloses a double-way DC voltage stabilizing power supply, which comprises a main circuit and an auxiliary circuit. One set of secondary electrodes of a transformer of each of the circuits is connected with a rectifier; the output end of the rectifier is connected with the input end of the filter; the output end of the filter is connected with the source electrode end of a power field effect transistor, drain electrodes of the power field effect transistor is connected with a dummy load, a tracking control circuit and a sampling circuit; the tracking control circuit is connected with a comparing and amplifying unit of the auxiliary circuit; a grid electrode of the power field effect transistor is connected with the comparing and amplifying unit; one end of the comparing and amplifying unit is connected with the sampling circuit, and the other end is connected with an auxiliary power supply; the auxiliary power supply is also connected with the other secondary electrodes of the transformers.

Description

The two-way D.C. regulated power supply

The utility model relates to a kind of two-way D.C. regulated power supply.

Present used commodity linear direct current regulated power supply, be used for realizing that the adjustment pipe of exporting voltage stabilizing has all adopted double pole triode, the circuit theory of used circuit realizes that the adjustment pipe tube voltage drop of voltage stabilizing is big, and the outstanding shortcoming of this technology is exactly that efficient is low, thereby has wasted many electric energy and metal.

The purpose of this utility model provides a kind of improved novel two-way D.C. regulated power supply.Because technical improvement has reduced the adjustment pipe power consumption that constitutes the main pressure regulator loop, and improves about 20% efficient, thereby saved electric energy greatly.Because electric energy has been saved, the natural heat dissipation device also reduces, thereby has reduced metal consumption.And adjustment pipe of the present utility model when parallel connection, need not the apolegamy, provide convenience to production, the reliability and the life-span of complete machine are greatly improved.

To achieve these goals, the utility model provides a kind of two-way D.C. regulated power supply, and the basic circuit of two-way all is the same, be called main road and bypass, with regard to main road, it comprises transformer and accessory power supply, it is characterized in that a group of transformer is secondary to link to each other with rectifier; The output terminal of rectifier is connected with the input end of wave filter; The output terminal of wave filter links to each other with the source electrode of power field effect pipe; The drain electrode of power field effect pipe links to each other with fictitious load, tracking Control and sample circuit, and the grid of power field effect pipe links to each other with the comparison amplifying unit; Relatively an end of amplifying unit links to each other with sample circuit, and the other end links to each other with accessory power supply; Tracking Control links to each other with comparison amplifying unit in the bypass again; Accessory power supply also with other secondary linking to each other of transformer; Adjust pipe employing power field effect pipe and replace bipolar transistor, thereby simplified driving circuit has reduced power consumption, has improved fiduciary level, flowed easier realization as in parallel expansion of the power field effect pipe of adjusting pipe.

The tube voltage drop size of adjusting pipe is the principal element that influences overall efficiency.The utility model has been introduced low pressure reduction technology in order to reduce tube voltage drop, thereby tube voltage drop has been reduced about 3V than bipolar transistor, has further improved efficient.

Owing in the above-mentioned solution, improved and adjusted pipe, thereby whole aircraft reliability is improved, be convenient to produce, reduced power consumption; On the other hand, owing on circuit theory, adopted low pressure reduction technology, make the power supply overall efficiency that the raising of essence arranged.The raising of efficient has driven reducing of machine volume, and metal consumption is few, and cost is reduced, and has improved product competitiveness.

The utility model is described in further detail below in conjunction with drawings and Examples.

Fig. 1 is the theory diagram of the utility model two-way D.C. regulated power supply;

Fig. 2 is embodiment circuit theory diagrams of the utility model two-way D.C. regulated power supply.

In Fig. 1, the frame figure number is with " ｀ " number respectively and is not with " ｀ " number.Not with " ｀ " number a road be called main road, otherwise be bypass.Circuit is all the same in corresponding number the frame, is exactly: 1 and 1 ｀, transformer; 2 and 2 ｀, rectifier; 3 and 3 ｀, wave filter; 4 and 4 ｀, power field effect pipe; 5 and 5 ｀,

fictitious load

6 and 6 ｀, sample circuit; 7 and 7 ｀, comparison amplifying unit; 8 and 8 ｀, accessory power supply; 9, follow-up control circuit.

In Fig. 1, because major-minor two-way circuit is the same substantially, so only set forth main road.Transformer 1 is transformed to input ac voltage the voltage that exchanges low voltage value, be transformed to pulsating dc voltage through rectifier 2, deliver to the source electrode of power field effect pipe 4 through wave filter 3, the drain electrode of power field effect pipe 4 is output terminal Uom, with fictitious load 5, tracking Control 9 with take a sample and 6 link to each other.By the fluctuation sampling of output Uom, deliver to comparison amplifying unit 7, relatively the other end of amplifying unit 7 is connected to the grid g of power field effect pipe 4, thus power controlling field effect transistor 4 is adjusted the tube voltage drop of self, reaches the purpose of voltage-regulation voltage-stabilization.Accessory power supply 8 also links to each other with comparison amplifying unit 7 with transformer 1.The voltage stabilizing process of circuit can be presented below:

The magnitude of voltage that causes sample circuit 6 rises if output voltage U om rises, so just make that relatively the current potential of amplifying unit 7 rises, just the current potential of the grid g of power field effect pipe 4 rises, this drain D current potential that has caused power field effect pipe 4 again descends, also be that output voltage U om descends, thereby stablized output voltage.

Vice versa.

This power supply is that two-way is exported, both can use separately, but also the two-way series connection used, but both malleation output, but also negative pressure output, but also the two-way tracking is used, and the realization of following function is realized by tracking Control 9.

Adjustment pipe of the present utility model adopts power field effect pipe MOSFET.The advantage of this scheme is not need at the control utmost point, and promptly grid g sets up driving circuit, thereby has simplified circuit greatly, and has reduced unnecessary loss thus, has increased the stability and the reliability of circuit working.And the important point to be that the common double gated transistors is difficult in parallel, bring certain difficulty for big electric current output.And power field effect pipe MOSFET is quite different, its in parallel being very easy to, and all pipes in parallel can be realized the automatic current equilibrium, and the functional reliability of circuit is greatly improved.Another one important improvement point of the present utility model is to have adopted low pressure reduction mu balanced circuit, when making the tube voltage drop of power field effect pipe MOSFET between drain D and source S almost near zero volt voltage, can also play the pressure regulation effect, than adopting bipolar transistor to raise the efficiency about 20%.The realization of this advantage is to adopt the output of the drain D of power field effect pipe MOSFET to realize.Another advantage of the utility model circuit is the startup difficult problem that does not have similar circuit.

Fig. 2 is an embodiment of the present utility model.In main road, transformer 1 is for having three secondary transformer T; Rectifier 2 is bridge rectifier diode D1; Wave filter 3 is electrolytic condenser C1; Power field effect pipe 4 is MOSFET; Sample circuit 6 is made of resistance R 1; Relatively amplifying unit 7 is operational amplifier IC1, and model is LM358; Fictitious load 5 is resistance R 9; Accessory power supply 8 is by bridge rectifier diode D2, D3, integrated regulator IC2, and model is 7812, the IC3 model is 7912, capacitor C2, C3, C4, C5, resistance R 4, stabilivolt Z forms.Resistance R 2, R5 and R6 form adjustable reference, and adjustable to realize output, integrated regulator IC2 provides positive voltage of voltage regulation, and voltage stabilizing integrated electric IC3 provide negative voltage of voltage regulation, to support the required normal working voltage of circuit.Resistance R 3 is pull-up resistors of operational amplifier IC1.K, R7, R8 forms tracking Control 9, when the K plate to 1 the time, two-way uses separately, plate was to 2 o'clock, two-way is realized following the tracks of.Bypass output is Uos, and its circuit is same as main road, so be omitted.

Claims

1. a two-way D.C. regulated power supply has main road and bypass, and there are transformer and accessory power supply in each road, it is characterized in that a group of each road transformer is secondary to link to each other with rectifier; The output terminal of rectifier is connected with the input end of wave filter; The output terminal of wave filter links to each other with the source terminal of power field effect pipe; The drain electrode of power field effect pipe links to each other with fictitious load, tracking Control and sample circuit; Tracking Control links to each other with the comparison amplifying unit of bypass again; The grid of power field effect pipe links to each other with the comparison big unit; Relatively an end of amplifying unit links to each other with sample circuit, and the other end links to each other with accessory power supply, accessory power supply also with other secondary linking to each other of transformer.

2. two-way D.C. regulated power supply according to claim 1 is characterized in that transformer is transformer (T) and (the T ｀) with several secondary winding; Rectifier is bridge rectifier diode (D1) and (D1 ｀); Wave filter is electrolytic condenser (C1) and (C1 ｀); Power field effect pipe is (MOSFET) and (MOSFET), and sample circuit is made of resistance (R1) and (R1 ｀); Relatively amplifying unit is operational amplifier (IC1) and (IC1 ｀); Fictitious load is resistance (R9) and (R9 ｀); Accessory power supply is by bridge rectifier diode (D2, D3) and (D2 ｀, D3 ｀), integrated regulator (IC2, IC3) and (IC2 ｀, IC3 ｀), capacitor (C2, C3, C4, C5) and (C2 ｀, C3 ｀, C4 ｀, C5 ｀), resistance (R4) and (R4 ｀), stabilivolt (Z) and (Z ｀) form; Follow-up control circuit is by switch (K), and resistance (R7, R8) is formed.Resistance (R3) and (R3 ｀) are respectively the pull-up resistors of integrated circuit (IC1) and (IC1 ｀), resistance (R5, R6), (R5 ｀, R6 ｀) and (R2), (R2 ｀) constitute adjustable reference.