CN201181977Y

CN201181977Y - A booster circuit, tuner voltage circuit and television set

Info

Publication number: CN201181977Y
Application number: CNU2008200932307U
Authority: CN
Inventors: 陈军; 陈锋
Original assignee: Shenzhen Skyworth RGB Electronics Co Ltd
Current assignee: Shenzhen Skyworth RGB Electronics Co Ltd
Priority date: 2008-03-31
Filing date: 2008-03-31
Publication date: 2009-01-14
Anticipated expiration: 2018-03-31

Abstract

The utility model provides a boost circuit, a high-frequency head tuning voltage circuit and a television, which are applied to household electrical appliances. The boost circuit comprises an input voltage superposition circuit and a rectification filter circuit. In the utility model, the boost circuit is used for replacing the boost chip, so the circuit has the advantages of simple structure, low cost and high reliability; and different input voltages can be selected for superposition, and the amplitude values of the input voltages can be regulated, thereby acquiring direct current volatages with different amplitude values.

Description

A kind of booster circuit, tuner tuning voltage circuit and television set

Technical field

The utility model belongs to household appliance technical field, relates in particular to a kind of booster circuit, tuner tuning voltage circuit and television set.

Background technology

At present, household electrical appliance are used in the middle of the family life widely, wherein, all be provided with booster circuit in the power circuit of household electrical appliance, present booster circuit substantially all realizes by the chip that boosts, and powers by the special use chip that boosts exactly such as television tuner tuning voltage circuit, but adopts the special use chip that boosts to exist cost higher, adjustability is not high, the shortcoming that reliability is relatively poor.

Summary of the invention

The purpose of this utility model is to provide a kind of booster circuit, is intended to solve existing booster circuit and exists cost higher because of the employing chip that boosts, and adjustability is not high, the problem that reliability is relatively poor.

The utility model is achieved in that a kind of booster circuit, and described circuit comprises:

The input voltage supercircuit, its a plurality of inputs connect different input voltages respectively, and this circuit is adjusted the range value of described input voltage and export the back that superposes; And

Current rectifying and wave filtering circuit, its input connects the output of described input voltage supercircuit, and the voltage that the back that superposes is exported carries out rectifying and wave-filtering, and output is through the direct voltage after boosting.

Another purpose of the present utility model is to provide a kind of tuner tuning voltage circuit, described tuner tuning voltage circuit contains above-mentioned booster circuit, the output termination rectification filtering voltage stabilizing circuit of described booster circuit, the direct voltage of booster circuit output is exported to tuner through behind the rectification filtering voltage stabilizing circuit.

Another purpose of the present utility model is to provide a kind of television set that contains above-mentioned tuner tuning voltage circuit.

In the utility model, adopt this booster circuit to replace the chip that boosts, make that this circuit structure is simple, with low cost, reliability is high, and can select different input voltages to superpose, and can adjust, thereby obtain the direct voltage of different range values to the range value of input voltage.

Description of drawings

Fig. 1 is the circuit theory diagrams of the booster circuit that provides of the utility model;

Fig. 2 is the voltage oscillogram of the booster circuit key node that provides of the utility model;

Fig. 3 is the circuit theory diagrams of the tuner tuning voltage circuit that provides of the utility model.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.

Fig. 1 shows the circuit structure of the booster circuit that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model.

Resistance R ₁, resistance R ₂, resistance R ₃, resistance R ₄, diode D ₁And capacitor C ₁Form the input voltage supercircuit, and diode D ₂With electrochemical capacitor C ₃Form current rectifying and wave filtering circuit.

As an embodiment of the present utility model, an input input direct voltage V of booster circuit _CC, it is through resistance R ₁, connected resistance R over the ground ₃After boosting, again through diode D ₁After the conducting, arrive V ₁Node is by adjusting resistance R ₁Or resistance R ₃Resistance, can obtain suitable voltage amplitude value, another input input pulse voltage V of booster circuit _P, it is through resistance R ₂, connected resistance R over the ground ₄After boosting, again through capacitor C ₁, with arrival V ₁The direct voltage stack of node is by adjusting resistance R ₂Or resistance R ₄Resistance, also can obtain suitable pulse voltage V _PRange value, the voltage signal after the stack is through diode D ₂With electrochemical capacitor C ₃After carrying out rectifying and wave-filtering, promptly exportable stably through the direct voltage V after boosting ₂The voltage signal type of booster circuit input input is not limited to above-mentioned two kinds, can make full use of the purpose that various voltage signal types realize DC boosting.

Fig. 2 shows the voltage waveform of the booster circuit key node that the utility model provides, direct voltage V _CCWith pulse voltage V _PThe voltage amplitude value can adjust direct voltage V by the resistance value that changes booster circuit _CCWaveform and pulse voltage V _PWaveform forms V through the stack back ₁The node voltage waveform, its voltage amplitude value equals direct voltage V _CCWith pulse voltage V _PVoltage amplitude value sum, also to deduct resistance R ₁, resistance R ₂With diode D ₁On pressure drop, V ₂The node voltage waveform is V ₁The waveform of node voltage through obtaining behind the rectifying and wave-filtering, its voltage amplitude value equals V ₁The voltage amplitude value of node voltage deducts diode D ₂On pressure drop, V ₂The voltage of node output is the direct voltage after boosting.

Fig. 3 shows the circuit structure of the tuner tuning voltage circuit that the utility model provides, and for convenience of explanation, only shows the part relevant with the utility model.

V ₂The direct voltage that the above-mentioned booster circuit of process of node output boosts passes through by capacitor C again ₂, electrochemical capacitor C ₅, capacitor C ₄, electrochemical capacitor C ₆, capacitor C ₇, diode D ₃, diode D ₄, voltage stabilizing didoe D ₅With adjustable resistance R ₅After the rectification filtering voltage stabilizing circuit rectification of forming, filtering, the voltage stabilizing, for the tuner of television set provides tuning voltage.Wherein, change adjustable resistance R ₅Resistance value can adjust the voltage amplitude value of tuning voltage, for the tuner of television set provides suitable tuning voltage.Such as, the direct voltage V of tuner tuning voltage circuit input _CCWith pulse voltage V _PThe voltage amplitude value be 12V all, deduct resistance R ₁, resistance R ₂, adjustable resistance R ₅, diode D ₁, diode D ₂, diode D ₃With diode D ₄On pressure drop, again through electrochemical capacitor C ₆, capacitor C ₇Filtering and voltage stabilizing didoe D ₅After (33V voltage stabilizing didoe), obtain the direct voltage of 33V, for the tuner of television set provides tuning voltage.

The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.

Claims

1. A voltage boosting circuit, characterized in that the circuit comprises:

an input voltage superposition circuit, a plurality of input terminals of which are respectively connected to different input voltages, and the circuit adjusts the amplitude value of the input voltage and outputs it after superposition; and

The rectification filter circuit, the input end of which is connected to the output end of the input voltage superposition circuit, rectifies and filters the superimposed output voltage, and outputs a boosted DC voltage.

2. The booster circuit according to claim 1, characterized in that, the input voltage superimposing circuit specifically comprises two input terminals, respectively connected to a DC voltage and a pulse voltage, and the input voltage superimposing circuit changes the resistance value of the resistor by changing the resistance value of the resistor. Adjust the amplitude values of the DC voltage and the pulse voltage, and output them after superposition.

3. The booster circuit according to claim 2, wherein the rectification and filtering circuit uses rectification diodes and electrolytic capacitors to rectify and filter the voltage output by the input voltage superposition circuit.

4. A tuning voltage circuit for a tuner, the output terminal of which is connected to a tuner, characterized in that the tuning voltage circuit for a tuner comprises the boost circuit according to claim 1, and the output terminal of the boost circuit Connected to the rectification, filtering and stabilizing circuit, the DC voltage output by the booster circuit is output to the tuner after passing through the rectifying, filtering and stabilizing circuit.

5. A television set comprising the tuner voltage circuit of claim 4.