Circuit for seamless switching of double batteries of liquid crystal display

Abstract

The utility model discloses a liquid crystal display double-battery seamless switching circuit, which comprises a field effect transistor switch module, a sampling module, a control module and a voltage stabilizing module, and the field effect transistor switch module, the sampling module, the control module and the voltage stabilizing module are respectively connected with a display in series through leads. The utility model belongs to the technical field of liquid crystal displays, and particularly relates to a circuit for seamless switching of double batteries of a liquid crystal display.

Description

TECHNICAL FIELD

[0001] The utility model belongs to liquid crystal display technical field especially relates to a liquid crystal display double battery seamless switching circuit. BACKGROUND

[0002] The existing high-definition photographic liquid crystal display is applied to outdoor, requires portable and high brightness and the like, so two batteries are needed to better meet the requirement, when the display works with two batteries, one battery needs to be replaced with another battery when the battery power is nearly used up, the battery with the power is taken to charge, and the battery is inserted for use after being fully charged.

[0003] The existing high-definition photographic liquid crystal display cannot realize automatic switching of the power supply, so that the whole machine cannot guarantee long uninterrupted work, resulting in incomplete photographic picture and causing picture fault. INVENTION CONTENTS

[0004] The utility model solves the technical problem that the existing equipment cannot realize automatic switching of the power supply.

[0005] In order to solve the above technical problem, the utility model adopts the following technical scheme: a liquid crystal display double battery seamless switching circuit, including field effect tube switch module, sampling module and control module and voltage stabilizing module, field effect tube switch module, sampling module and control module and voltage stabilizing module are connected in series with the display through the wire.

[0006] Further, the field effect tube switch module includes power supply one, power supply two, triode one, triode two, biasing resistor one, biasing resistor two, field effect tube one, field effect tube two and gate, the closed loop branch one formed by power supply one, triode one, biasing resistor one and field effect tube one, the closed loop branch two formed by power supply two, triode two, biasing resistor two and field effect tube two, the control module includes switching module one, switching module two and main control chip, switching module one and switching module two are connected to one end of main control chip in parallel, the other end of switching module one and switching module two is respectively connected with monitoring module one and monitoring module two in series.

[0007] Further, the closed loop branch one and the closed loop branch two are connected in parallel, and the field effect tube switch is connected in series with switching module one and switching module two.

[0008] Further, the other end of the main control chip is connected with output module one and output module two, and the other end of the output module is connected with control switch one and control switch two in series.

[0009] Further, triode one and triode two are both NPN triodes.

[0010] After the above structure, the utility model has the advantages that:

[0011] (1) through the gate setting in the field effect transistor switch module, realize the stabilized power supply, ensure the voltage stability of display power supply.

[0012] (2) through the linkage of sampling module and control module, realize the power monitoring of power supply, and realize the automatic switching of power supply through the monitoring result. BRIEF DESCRIPTION OF DRAWINGS

[0013] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of this specification, illustrate embodiments of the present application, and together with the present application to explain the present application, and do not constitute the limitation of the present application.

[0014] Figure 1 It is the whole structure circuit schematic diagram of the utility model;

[0015] Figure 2 It is the double battery electric quantity sampling and switch switching circuit diagram of the utility model;

[0016] Figure 3 It is the DC-DC stabilized power supply circuit diagram of the utility model;

[0017] Figure 4 It is the switch control circuit diagram of the utility model.

[0018] In the drawings: JP4, power supply one, JP5, power supply two, Q5, triode one, Q6, triode two, R380, biasing resistor one, R381, biasing resistor two, U5, field effect transistor one, U6, field effect transistor two, G, gate, Q14, switching module one, Q15, switching module two, U4, main control chip, BAT1_AD, monitoring module one, BAT2_AD, monitoring module two, BAT1_EN, output module one, BAT2_EN, output module two. DETAILED DESCRIPTION

[0019] As Figure 1 Shown, a kind of liquid crystal display double battery seamless switching circuit, it includes field effect transistor switch module, sampling module and control module and stabilizing module, field effect transistor switch module, sampling module and control module and stabilizing module are connected in series with display by wire respectively.

[0020] As Figures 2-3As shown in FIG. 4, the field effect tube switch module includes power supply one JP4, power supply two JP5, transistor one Q5, transistor two Q6, bias resistor one R380, bias resistor two R381, field effect tube one U5, field effect tube two U6 and gate G, the closed loop branch one composed of power supply one JP4, transistor one Q5, bias resistor one R380 and field effect tube one U5, the closed loop branch two composed of power supply two JP5, transistor two Q6, bias resistor two R381 and field effect tube two U6, the control module includes switching module one Q14, switching module two Q15 and main control chip U4, switching module one Q14 and switching module two Q15 are connected in parallel to one end of main control chip U4, and the other end of switching module one Q14 and switching module two Q15 is respectively connected with monitoring module one BAT1_AD and monitoring module two BAT2_AD in series.

[0021] Wherein, the closed loop branch one and the closed loop branch two are connected in parallel, the field effect tube switch is connected in series with switching module one Q14 and switching module two Q15, the other end of the main control chip is connected with output module one BAT1_EN and output module two BAT2_EN, and the other end of the output module is connected with control switch one Q5 and control switch two Q6 in series, and transistor one Q5 and transistor two Q6 are both NPN transistors.

[0022] In specific use, when power supply one JP4 and power supply two JP5 are inserted into the battery, bias resistor one R380 and bias resistor two R381 make NPN transistor one Q5 and transistor two Q6 base saturated conduction, so that field effect tube one U5 and field effect tube two U6 gate G low level and turn on, so that the stabilized power supply can be powered. When the key S4 is pressed for a long time, Q13 is turned on and EN is high, and then R43 D19 is self-locked to enable the stabilized power supply U34; in the state of starting, the key S4 is pressed for a long time, the main control chip U4 enters the shutdown state, POW_EN outputs high level, and EN is low through Q3 inversion to turn off the whole machine power supply. In the working process of the whole machine, the battery capacity is sampled and judged by monitoring module one BAT1_AD and monitoring module two BAT2_AD, when the battery 1 capacity is lower than 6V, output module one BAT1_EN outputs high level, field effect tube one U5 is cut off through switching module one Q14 and transistor one Q5 inversion, and power supply one JP4 stops power supply; output module two BAT2_EN outputs low level, field effect tube two U6 is turned on through switching module two Q15 and transistor two Q6 inversion, and power supply two JP5 starts power supply.

[0023] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents. In general, if a person skilled in the art is inspired by the present application, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical scheme should belong to the protection scope of the present application.

Claims

1. A circuit for double cell seamless switching of a liquid crystal display, characterized by: Including field effect tube switch module, sampling module and control module and voltage stabilizing module, field effect tube switch module, sampling module and control module and voltage stabilating module are connected in series with display through wire respectively; The field effect tube switch module includes power supply one, power supply two, triode one, triode two, biasing resistor one, biasing resistor two, field effect tube one, field effect tube two and gate, the closed loop branch one formed by power supply one, triode one, biasing resistor one, field effect tube one, the closed loop branch two formed by power supply two, triode two, biasing resistor two, field effect tube two, the control module includes switching module one, switching module two and main control chip, switching module one and switching module two are connected in parallel to one end of main control chip, the other end of switching module one and switching module two is respectively connected with monitoring module one and monitoring module two in series; The closed loop branch one and closed loop branch two are connected in parallel, and the field effect tube switch is connected in series with switching module one and switching module two.

2. The circuit for double cell seamless switching of a liquid crystal display according to claim 1, wherein: The other end of the output module is connected with control switch one and control switch two in series.

3. The circuit for double cell seamless switching of a liquid crystal display according to claim 1, wherein: The triode one and triode two are both NPN triode.

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