CN2254564Y - Ultra-wide serial voltage-stabilized source apparatus - Google Patents

Abstract

The utility model relates to an ultra-wide serial voltage-stabilized power source apparatus. The power source mainly solves the shortage that the voltage-stabilized power source of the existing satellite receiving modulator has unstable output and poor performance. A sample circuit, a comparison circuit and a control circuit are additionally arranged in the original serial voltage-stabilized power source; the primary of a transformer is provided with an intermediate tap; the control circuit controls the different connection of a contact point of a relay with the intermediate tap of the transformer and a tap at the other end, and controls the primary turn ratio of the transformer; consequently, the voltage output is stabilized; the receiving effect is enhanced. The power source can also be used for other domestic appliances. The utility model has the advantages of stable voltage, wide voltage-stabilizing range, etc.

Description

Super wide tandem stabilized voltage supply device

The utility model relates to satellite and receives and the modulation technique field, and particularly a kind of satellite receives the stabilized voltage supply of modulator.

Existing satellite receiver and the employed tandem stabilized voltage supply device of modulator, at line voltage is under the situation of 220VAC, its voltage stabilized range is generally between 180～250VAC, like this, in some area, because line voltage is crossed low or too high, the situation that causes household electrical appliance and other electronic equipment cisco unity malfunction even burn out happens occasionally, though and switching mode voltage stabilizer has the voltage stabilized range of broad because its high frequency radiation that is difficult to overcome, the failure rate height, poor stability, cost is higher in addition, and at satellite television receiver, in CATV front-end equipment and some other electronic equipments, its use is very restricted.

The purpose of this utility model is to avoid the deficiency of above-mentioned prior art, provides a kind of voltage stable, and voltage stabilized range is wide, can make satellite receiver modulator and other electronic equipment when voltage ripple of power network is excessive, the tandem stabilized voltage supply device of energy operate as normal.

Realize that the utility model purpose technical scheme is on the basis of original tandem stabilized voltage supply, the elementary of transformer is made as one or more centre taps, and sets up sample circuit, comparator circuit, control circuit.Take out the voltage floating sign by sample circuit and send into comparator circuit, give control circuit from comparer output voltage comparison signal, the pilot relay contact is connected with the different of other end tap with the centre tap of primary, to change the primary turn ratio, guarantees its stable output.The output feedback of mu balanced circuit is connected to comparator circuit, as its operating voltage.

Experimental result shows, the utility model can fully effectively be widened the voltage stabilized range of tandem stabilized voltage supply, and working stability is reliable, for example, use a centre tap and a relay of main-transformer, utilize external teaser transformer in elementary sampling, can reach 130V-260VAC through testing its voltage stabilized range.Utilize a plurality of tappings if increase, a plurality of relays and corresponding control circuit, then the voltage stabilized range of power supply just can be wideer.

Be described in detail structure of the present utility model and principle of work below in conjunction with accompanying drawing.

Fig. 1 is a block scheme of the present utility model.

Fig. 2 is an embodiment schematic circuit of utility model.

With reference to Fig. 1, the utility model is by sample circuit, comparator circuit, and control circuit, mu balanced circuit constitutes.The output of sample circuit is connected with an end of comparator circuit, and the output of comparator circuit is connected with control circuit, and control circuit links to each other with mu balanced circuit.The output feedback of mu balanced circuit links to each other with comparator circuit.

With reference to Fig. 2, sample circuit of the present utility model is by transformer T ₂, bridge rectifier pipe D ₅～D ₈, capacitor C ₃, C ₂And resistance R ₁Form.Comparator circuit is by double operational IC ₁, resistance R ₂, R ₅, R ₆, R ₇, R ₈, R ₉, R ₁₁Form.Control circuit is by transistor Q ₁, diode D ₉, relay J K ₁, resistance R ₃, R ₄, R ₁₀Form.Mu balanced circuit is by transformer T ₁, bridge rectifier pipe D ₁～D ₄, ic chip ₂And capacitor C ₁Form.Transformer T ₁The elementary centre tap A that is provided with ₂The centre tap A of transformer ₂With another tap A ₁Respectively with relay J K ₁Two points 5 link to each other with 4.Relay J K ₁Contact S and power supply AC join, by the control circuit output signal, control JK ₁The S point with its other 2: 4 with different connection of 5, to change the primary turns ratio of transformer.The output of sample circuit and amplifier IC ₁An end link to each other, input to IC ₁A voltage compares oxide-semiconductor control transistors Q ₁By and conducting, again by Q ₁The contact of management and control system relay connects.Mu balanced circuit IC ₂Output pass through resistance R ₈, R ₇Supply with double operational IC ₁Operating voltage.

Ic chip among Fig. 1 ₁Adopt the double operational pipe of disposable type, IC ₂Adopt the three terminal integrated voltage stabilizer of 78 series.

Principle of work of the present utility model is as follows:

(1) when line voltage (LZNE AC) was 180V～260VAC, stabilized voltage supply was in normal operating conditions, and electric power output voltage is A, IC in this moment control circuit ₁1. terminal voltage is higher than 2. end, and 3. end is low level, Q ₁Pipe ends, and relay is on the normally closed contact 4, simultaneously IC ₁Also be low level 4., 6..

(2) be reduced to 180VAV when following when line voltage, by T ₂Detect time and to change, make 1. that point voltage is reduced to when 2. putting, 3. the circuit counter-rotating becomes high level, Q ₁Conducting is also saturated, and relay promptly switches on the adhesive contact 5 then.The main-transformer primary voltage adds to tap A ₂On, thereby changed turn ratio between primary and secondary, make the secondary normal operating conditions that still is in, electric power output voltage A remains unchanged, and be high level this moment 6. 4., makes 2. point voltage raise assurance Q simultaneously ₁Reliably saturated.So, the voltage stabilizing lower limit of power supply can reach below the 130VAC.

(3) when line voltage comes back to 180VAC and since this moment 2. point voltage raise, 1. point voltage still is lower than 2. point, thus 3. still be high level, Q ₁Still saturated, relay still is in contact 5, thereby has avoided near voltage fluctuation switching point, and the situation of relay frequent movement takes place.

(4) when line voltage is increased to 190VAC, 1. point voltage begins to be higher than 2. point again.3. become high level, Q ₁End.Relay recovery is to normally closed contact, and power supply is got back to normal operating conditions again.With this guaranteed this power supply can be under 130V～260VAC line voltage operate as normal.

Claims (2)

1. super wide tandem stabilized voltage supply device, comprise sample circuit, comparator circuit, control circuit, mu balanced circuit, the output and the comparator circuit of sample circuit join, and the output and the control circuit of comparator circuit join, the output and the mu balanced circuit of control circuit join, and it is characterized in that:

A. the transformer T of mu balanced circuit ₁Elementaryly be provided with one or more centre taps, the through and off by the control circuit contact are connected with centre tap or another tap of transformer respectively, change the primary turn ratio, stable output;

B. the output feedback of mu balanced circuit is connected with comparer, as its operating voltage.

2. require 1 described stabilized voltage supply according to the right profit, it is characterized in that comparator circuit selects the double operational device of making comparisons for use.

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