CN211403380U - Power supply adaptation circuit for notebook computer - Google Patents

Abstract

The utility model discloses a power adapter circuit for notebook computer, which comprises a main system module and a WIFI Bluetooth module on the notebook computer mainboard, and is characterized in that the main system module and the WIFI Bluetooth module adopt separate isolated DC-DC conversion circuits to provide power, and are respectively a main circuit DC-DC module and a WIFI Bluetooth DC-DC module, and the first-level power isolation of the mainboard is respectively realized; a second-stage power isolation circuit is additionally arranged at the power output end of the WIFI Bluetooth DC-DC module to realize second-stage power isolation of the WIFI module; the main circuit DC-DC module realizes the conversion of 12V into 5V and 3.3V, and the WIFI Bluetooth DC-DC module realizes the conversion of 12V into 3.3V. Through the two-stage isolation setting, especially to WIFI bluetooth module, the ripple that WIFI bluetooth module itself introduced when it was at during operation WIFI transmission data prevents the interference to whole power network.

Description

Power supply adaptation circuit for notebook computer

Technical Field

The utility model relates to a notebook power technical field especially relates to a power supply adapter circuit for notebook.

Background

Compared with a large host, the notebook computer has a relatively smaller overall structure, more compact internal integrated components and more internal functional modules, such as a hard disk, a display screen, a Bluetooth module, a WIFI module and the like. The power supply system adopts the same group of power supplies, generally adopts a switch power supply, and the same power supply is divided into a plurality of paths to respectively supply power to each module, so that each module can be an interference source relative to other modules in the working process, and the normal work of other modules is influenced by mutual interference of a power supply network. When the data transmission is realized by the WIFI module and the Bluetooth module, the energy consumption is increased, voltage change and high-power interference are possibly caused, so that the WIFI module and the Bluetooth module need to be isolated or independently powered, the independent power supply effect is certainly the best, but the cost is inevitably provided, and therefore the WIFI module and the Bluetooth module are not suitable for commercialization. Therefore, if a simple circuit can be adopted to perform necessary isolation, the interference brought by the working process of the circuit is controlled within the allowable range of other circuits, thereby being beneficial to realizing productization on the premise of ensuring the product quality and realizing commercial value.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an aim at how to design an isolating circuit and realize that each module power supply branch road of notebook power keeps apart each other, especially solves the isolation problem of WIFI module and bluetooth module's power supply branch road.

In order to realize the purpose, the utility model provides a power adapter circuit for a notebook computer, which comprises a main system module and a WIFI Bluetooth module on a notebook computer mainboard, and is characterized in that the main system module and the WIFI Bluetooth module adopt separate isolated DC-DC conversion circuits to provide power, and are respectively a main circuit DC-DC module and a WIFI Bluetooth DC-DC module to respectively realize the first-level power isolation of the mainboard; a second-stage power isolation circuit is additionally arranged at the power output end of the WIFI Bluetooth DC-DC module to realize second-stage power isolation of the WIFI module; the main circuit DC-DC module realizes the conversion of 12V into 5V and 3.3V, and the WIFI Bluetooth DC-DC module realizes the conversion of 12V into 3.3V.

The power adapter circuit for the notebook computer is characterized in that the WIFI Bluetooth DC-DC module comprises an isolation power conversion chip U1, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R11 and a resistor R12; the isolated power conversion chip U1 includes: a + Vs pin, a-Vs pin, a + Vout pin, an ERROR pin, a Vrec pin, an ENABLE pin, and a-Vout pin; the + Vs pin is connected with an external 12V power supply input, and the-Vs pin is connected with a grounding pin of an external power supply; the ERROR pin is connected with the + Vout pin through a resistor R11; the Vs pin is a grounding pin of the WIFI Bluetooth module, the ENABLE pin is connected with a resistor R12 in series, then connected with a Vrec pin, and then connected with a capacitor C12 in series and then grounded; the + Vout pin is also connected with a capacitor C11 which plays a role of filtering at the output end, and a capacitor C13 is also connected between the + Vs pin and the ground.

The power supply adapting circuit for the notebook computer is characterized in that the second-stage power supply isolating circuit comprises an MOS tube Q1, a capacitor C1\ C2\ C3, an electrolytic capacitor C4, a resistor R1\ R2 and a diode D1, the MOS tube Q1 is respectively provided with an S stage, a D stage and a G stage, a 3.3V power supply output by the WIFI Bluetooth DC-DC module is connected with the S stage of the MOS tube Q1, the capacitor C1 and the resistor R1 are connected between the S stage and the G stage in parallel, the G stage is connected with the resistor R2 in a grounding mode, the D stage is connected with the capacitor C2, the capacitor C3 and the electrolytic capacitor C4 in a grounding mode, and the D stage is further connected with the diode D1 which is conducted in a one-way in series.

The utility model has the advantages that: through the two-stage isolation setting, especially to WIFI bluetooth module, the ripple that WIFI bluetooth module itself introduced when it was at during operation WIFI transmission data prevents the interference to whole power network.

Drawings

FIG. 1 is a system block diagram of a power adapter circuit for a notebook computer;

fig. 2 is a circuit implementation diagram of a WIFI bluetooth DC-DC module;

fig. 3 is a diagram of an implementation of a second stage power isolation circuit.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

FIG. 1 is a system block diagram of a power adapter circuit for a notebook computer; the notebook computer mainboard comprises a main system module and a WIFI Bluetooth module, and is characterized in that the main system module and the WIFI Bluetooth module adopt independent isolated DC-DC conversion circuits to provide power supplies, are respectively a main circuit DC-DC module and a WIFI Bluetooth DC-DC module, respectively realize the first-stage power supply isolation of the mainboard, and reduce the input 12V direct current to perform isolated DC-DC conversion into the power supply required by a subsequent circuit; a second-stage power isolation circuit is additionally arranged at the power output end of the WIFI Bluetooth DC-DC module to realize second-stage power isolation of the WIFI module; the main circuit DC-DC module realizes the conversion of 12V into 5V and 3.3V, and the WIFI Bluetooth DC-DC module realizes the conversion of 12V into 3.3V.

Fig. 2 is a circuit implementation diagram of a WIFI bluetooth DC-DC module; the circuit of the WIFI Bluetooth DC-DC module comprises an isolation power conversion chip U1, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R11 and a resistor R12; the isolated power conversion chip U1 includes: a + Vs pin, a-Vs pin, a + Vout pin, an ERROR pin, a Vrec pin, an ENABLE pin, and a-Vout pin; the + Vs pin is connected with an external 12V power supply input, and the-Vs pin is connected with a grounding pin of an external power supply; the ERROR pin is connected with the + Vout pin through a resistor R11; the Vs pin is a grounding pin of the WIFI Bluetooth module, the ENABLE pin is connected with a resistor R12 in series, then connected with a Vrec pin, and then connected with a capacitor C12 in series and then grounded; the + Vout pin is also connected with a capacitor C11 which plays a role of filtering at the output end, and a capacitor C13 is also connected between the + Vs pin and the ground. The Vi of the isolation power conversion chip U1 is input with 12V, the 12V is converted into 3.3V, and the isolation performance of the isolation power conversion chip U1 is utilized to realize the first-stage power isolation.

Fig. 3 is an implementation diagram of a second-stage power isolation circuit, the second-stage power isolation circuit includes a MOS transistor Q1, a capacitor C1\ C2\ C3, an electrolytic capacitor C4, a resistor R1\ R2 and a diode D1, the MOS transistor Q1 has a stage S, a stage D and a stage G, respectively, a 3.3V power output by the WIFI bluetooth DC-DC module is connected with the stage S of the MOS transistor Q1, the capacitor C1 and the resistor R1 are connected between the stage S and the stage G in parallel, the stage G is connected with the resistor R2 in a ground-to-ground manner, the stage D is connected with the capacitor C2, the capacitor C3 and the electrolytic capacitor C4 in a ground-to-ground manner, and the stage D1 is connected with a diode D1 that is connected in a unidirectional manner. When the circuit normally works, the MOS tube V_DSApproximately equal to 0V, MOS tube grid end grounding, V_GSThe MOS tube works in a linear region with-3.3V, and the on-resistance is approximately zero and is equivalent to a wire. When the current extraction of the load is increased instantaneously when the WIFI sends data and outputs, the electrolytic capacitor C4 which plays a decoupling role at first discharges instantaneously to supplement current for the circuit, the voltage of the D level is reduced, the voltage of the drain terminal of the MOS transistor is reduced, and V is_DSThe voltage is changed from zero to about-0.1V, the on-resistance of the MOS tube is not zero at the moment, the resistance value is certain, the resistance is connected into the circuit to play a certain current limiting role, so that the instantaneous value of the current flowing into the second-stage power isolation circuit from the WIFI Bluetooth DC-DC module cannot be increased instantaneously, the influence on other parts is caused, and the isolation effect is achieved.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (3)

1. A power supply adapting circuit for a notebook computer comprises a main system module and a WIFI Bluetooth module on a notebook computer mainboard, and is characterized in that the main system module and the WIFI Bluetooth module adopt independent isolated DC-DC conversion circuits to provide power supplies, and are respectively a main circuit DC-DC module and a WIFI Bluetooth DC-DC module, and the first-stage power supply isolation of the mainboard is respectively realized; a second-stage power isolation circuit is additionally arranged at the power output end of the WIFI Bluetooth DC-DC module to realize second-stage power isolation of the WIFI module; the main circuit DC-DC module realizes the conversion of 12V into 5V and 3.3V, and the WIFI Bluetooth DC-DC module realizes the conversion of 12V into 3.3V.

2. The power adapter circuit for notebook computer of claim 1, wherein the WIFI bluetooth DC-DC module comprises an isolated power conversion chip U1, a capacitor C11, a capacitor C12, a capacitor C13, a resistor R11, a resistor R12; the isolated power conversion chip U1 includes: a + Vs pin, a-Vs pin, a + Vout pin, an ERROR pin, a Vrec pin, an ENABLE pin, and a-Vout pin; the + Vs pin is connected with an external 12V power supply input, and the-Vs pin is connected with a grounding pin of an external power supply; the ERROR pin is connected with the + Vout pin through a resistor R11; the Vs pin is a grounding pin of the WIFI Bluetooth module, the ENABLE pin is connected with a resistor R12 in series, then connected with a Vrec pin, and then connected with a capacitor C12 in series and then grounded; the + Vout pin is also connected with a capacitor C11 which plays a role of filtering at the output end, and a capacitor C13 is also connected between the + Vs pin and the ground.

3. The power adapting circuit for the notebook computer as claimed in claim 2, wherein the second stage power isolating circuit comprises a MOS transistor Q1, a capacitor C1\ C2\ C3, an electrolytic capacitor C4, a resistor R1\ R2 and a diode D1, the MOS transistor Q1 has a stage S, a stage D and a stage G respectively, a 3.3V power output by the WIFI bluetooth DC-DC module is connected with the stage S of the MOS transistor Q1, the capacitor C1 and the resistor R1 are connected in parallel between the stage S and the stage G, the stage G is connected with the resistor R2 in a butt-joint manner, the stage D is connected with the capacitor C2, the capacitor C3 and the electrolytic capacitor C4 in a butt-joint manner, and the stage D1 is connected in series with a unidirectional conducting diode D1.

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