WO2018232785A1

WO2018232785A1 - Management circuit for multi-battery power source, and virtual reality head-mounted device

Info

Publication number: WO2018232785A1
Application number: PCT/CN2017/091826
Authority: WO
Inventors: 逄淑万
Original assignee: 歌尔科技有限公司
Priority date: 2017-06-21
Filing date: 2017-07-05
Publication date: 2018-12-27
Also published as: CN207021723U

Abstract

Disclosed are a management circuit for a multi-battery power source and a virtual reality head-mounted device. The circuit comprises: a plurality of voltameters, a change-over switch, a power source management chip and a processor chip, wherein each of the voltameters is connected to one battery from among multiple batteries so as to detect the electric quantity of the battery connected thereto and send the electric quantity to the processor chip; the processor chip is connected to each of the voltameters, the power source management chip and the change-over switch so as to acquire the electric quantity and a charging state of each battery, and control the change-over switch so same switches to and connects the corresponding battery; the change-over switch is used for connecting one of the multiple batteries to the power source management chip; and the power source management chip is used for charging the connected battery or controlling the connected battery so that same is discharged. The electric quantity of each battery is read in real time by using a voltameter, and whether to switch the battery is determined by means of the electric quantity of the battery. The circuit has a simple structure, and can effectively prevent false switching caused by battery voltage fluctuation due to power fluctuation, so that battery management is more reliable.

Description

Multi-battery power management circuit and a virtual reality wearing device

Technical field

The present application relates to the field of power management circuit technologies, and in particular, to a multi-battery power management circuit and a virtual reality headset.

Application background

As we all know, today's electronic products, especially wearable electronic products, such as mobile phones, wristbands, virtual reality (VR) headsets and other products continue to be small and intelligent development. As a result, the space for placing batteries in these electronic products is getting smaller and smaller, and as people rely on electronic products, these electronic products are increasingly used, and their power consumption is increasing. However, in general, the capacity of the battery is proportional to the volume of the battery, and the small space will not be able to provide a position for the large-capacity battery. Therefore, more and more products are powered by multiple batteries.

Application content

The present application proposes a multi-battery power management circuit and a virtual reality wearing device. The present application adopts the following technical solutions:

According to an aspect of the present application, a multi-battery power management circuit is provided, the circuit comprising: a plurality of fuel gauges, a switch, a power management chip, and a processor chip;

Each of the fuel gauges is connected to one of the plurality of batteries for detecting the amount of power of the connected battery and transmitting the power to the processor chip;

The processor chip is connected to each of the fuel gauges, the power management chip, and the switch to obtain a power and a state of charge of each battery, and control the switch to switch to a corresponding battery;

The switch is configured to connect one of the plurality of batteries to the power management chip;

The power management chip is configured to discharge the connected battery or control the connected battery.

Optionally, the processor chip is further configured to:

Determining whether the battery capacity of the power management chip is full when charging, controlling the switching of the switch if full, connecting another battery to the power management chip;

When discharging, it is determined whether the battery power of the power management chip is lower than a discharge threshold, and if it is lower, the switch is controlled to switch, and another battery is connected to the power management chip.

Optionally, the circuit further includes a power supply filter capacitor, one end of the power supply filter capacitor is connected to a connection end of the power management chip and the switch, and the other end of the power supply filter capacitor is grounded, and the power supply filter capacitor It is used for filtering, and the power supply process is not powered down when the switching switch is switched.

Optionally, the power management chip is connected to the processor chip through an IIC bus, and a STAT pin of the power management chip is connected to a universal input/output port of the processor chip, where the processor The chip reads a status value of the power management chip through the universal input/output port.

Optionally, each of the fuel gauges is connected to the processor chip through an IIC bus, and the INT pins of each of the fuel gauges are respectively connected to a universal input and output port of the processor chip. The processor chip reads an interrupt signal of each fuel gauge through the universal input/output port.

Optionally, the VDD pin and the CELL pin of each of the fuel gauges are connected to the VBATT end of the connected battery, and the CTG pin and the GND pin of each of the fuel gauges are grounded.

Optionally, the control end of the switch is connected to a universal input/output port of the processor chip, and the processor chip controls a switching action of the switch through the universal input and output port.

Optionally, the switch includes a first switch and a second switch, and the first switch and the second switch are single-pole multi-throw switches;

a dynamic end of the first switch is connected to a BAT pin of the power management chip, and a fixed end of the first switch is respectively connected to a VBATT end of the plurality of batteries;

a dynamic end of the second switch is connected to a TS pin of the power management chip, and a fixed end of the second switch is respectively connected to a TS end of the plurality of batteries;

The control ends of the first switch and the second switch are respectively connected to one universal input and output port of the processor chip.

Optionally, the processor chip is further configured to control, when charging, the switch to sequentially connect the multi-battery to the power management chip for charging; and control the switch according to charging when discharging In the reverse order, the multi-battery is connected to the power management chip for discharging.

According to another aspect of the present application, there is provided a virtual reality wearing device comprising a headgear body and a strap, the virtual reality headset comprising at least two batteries and the multi-battery power source of any of the above a management circuit; the multi-battery power management circuit is disposed on the headset device, and the batteries of the virtual reality headset are disposed on the headset device or respectively disposed on the headset device And on the strap.

In summary, the beneficial effects of the present application are:

By using the fuel gauge to read the power of each battery in real time, and judging whether to switch the battery by the battery power, the circuit structure is simple, and the false switching caused by the battery voltage fluctuation caused by the power fluctuation can be effectively prevented, and the battery management is more reliable.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a further understanding of the claims The description of the application is not intended to limit the application. In the drawing:

1 is a circuit diagram of a multi-battery power management circuit according to some embodiments of the present application;

2 is a circuit diagram of a multi-battery power management circuit for managing two batteries according to other embodiments of the present application;

In the figure, U1, processor chip; U2, power management chip; U3, first switch; U4, second switch; UF1, first fuel gauge; UF2, second fuel gauge; UFn, nth fuel gauge; UB1 First battery; UB2, second battery; UBn, nth battery; C1, bootstrap capacitor; C2, filter capacitor; C3, power supply filter capacitor; L1, inductor.

Detailed ways

In order to make the objects, technical solutions and advantages of the present application more clear, some embodiments of the present application will be further described below with reference to the accompanying drawings.

1 is a circuit diagram of a multi-battery power management circuit according to some embodiments of the present application. Referring to FIG. 1 , in some embodiments, a multi-battery power management circuit can manage a plurality of batteries, and the first battery UB1 and the second The battery UB2 to the nth battery UBn are taken as an example.

The multi-battery power management circuit includes: a plurality of fuel gauges (including a first fuel gauge UF1, a second fuel gauge UF2 to a nth fuel gauge UFn), a switch (including a first switch U3 and a second switch U4), and power management Chip U2 and processor chip U1, where n is an integer greater than two.

Each fuel gauge is connected to one of the plurality of batteries for detecting the amount of power of the connected battery and transmitting it to the processor chip U1.

The processor chip U1 is connected to each of the fuel gauges, the power management chip U2, and the switch to obtain the power and the state of charge of each battery, and controls the switch to switch to the corresponding battery according to the power of the battery.

A switch for connecting one of the plurality of batteries to the power management chip U2.

The power management chip U2 is configured to discharge the battery that is connected to the battery or control the access.

As can be seen from FIG. 1 , the multi-battery power management circuit of some embodiments of the present application utilizes a plurality of fuel gauges to respectively perform power detection on a plurality of batteries, and the fuel gauge package and the wiring are simple, so that the circuit structure of the entire circuit is simple. The wiring is easy to circuit and the cost is low; and the fuel gauge is used to detect the battery power. When the battery output power consumption is too large and the battery voltage is instantaneously reduced, the battery power is not erroneously judged, and the battery power detection result is more reliable. .

In some embodiments, the processor chip U1 can also be used to determine whether the battery power of the access power management chip U2 is full when charging, and if the battery is full, control the switching of the switch, and connect another battery to the power management chip U2; When discharging, it is judged whether the battery power of the power management chip U2 is lower than the discharge threshold. If it is lower, the switch is controlled to switch, and another battery is connected to the power management chip U2 to realize charging and discharging management of the plurality of batteries.

In some embodiments, the circuit further includes a power supply filter capacitor C3, and one end of the power supply filter capacitor C3 is connected to the power source tube. The connection terminal of the chip U2 and the switch is grounded, and the other end is grounded. As shown in FIG. 1, the power supply filter capacitor C3 is connected between the BAT pin of the power management chip U2 and the ground, and the power supply filter capacitor C3 can be used for BAT. Pin filtering, and in the power supply process, when the switching switch is switched, the temporary voltage is supplied through the energy storage function of the capacitor C3, and the power supply process is not powered down.

In some embodiments, the power management chip U2 is connected to the processor chip U1 through the IIC bus, and the STAT pin of the power management chip U2 is connected to a general-purpose input/output port of the processor chip U1 (ie, GPIO2 in the figure), and processed. The chip U1 reads the state value of the power management chip U2 through the general-purpose input/output port.

Referring to FIG. 1, the IIC bus is composed of a data line SDA and a clock signal line SCL, and can transmit and receive data. The processor chip U1 completes the related configuration of the power management chip U2 and the reading of the status information through the IIC bus. A general-purpose input/output port of the processor chip U1 is connected to the STAT pin of the power management chip U2, and reads the STAT value of the power management chip U2, for example, reading status values such as charging, charging completion, and temperature failure. In addition, the processor chip U1 is also connected to the INT pin of the power management chip through a general-purpose input and output interface to read the interrupt signal of the power management chip.

In some embodiments, a bootstrap capacitor C1 is connected between the SW pin and the BTST pin of the power management chip U2, and the SW pin is also connected to one end of the inductor L1, and the other end of the inductor L1 is an output terminal, and the output end is filtered. Capacitor C2 is grounded.

In some embodiments, the first fuel gauge UF1, the second fuel gauge UF2 to the nth fuel gauge UFn are all connected to the processor chip U1 through the IIC bus, and the INT pins of each fuel gauge are respectively associated with the processor chip U1. A general-purpose input and output port is connected, and the processor chip U1 reads the interrupt signal of each fuel gauge through the general-purpose input and output port.

As shown in FIG. 1 , in some embodiments, the first fuel gauge UF1 is connected to the first battery UB1, the second fuel gauge UF2 is connected to the second battery UB2, and the nth fuel gauge UFn is connected to the nth battery UBn, and each power is connected. The VDD pin and CELL pin of the meter are connected to the VBATT end of the connected battery to detect the corresponding battery power. The CTG pin and GND pin of each fuel gauge are grounded. Using a fuel gauge to detect battery power improves the accuracy of battery detection, and does not cause false switching due to battery voltage changes caused by sudden changes in power consumption, making multi-cell power management more reliable.

In some embodiments, the control terminal of the switch is connected to the general-purpose input/output port of the processor chip U1, and the processor chip U1 controls the switching action of the switch through the universal input/output port. As shown in FIG. 1 , the switch includes a first switch U3 and a second switch U4. The first switch U3 and the second switch U4 are single-pole multi-throw switches. Specifically, in this embodiment, the dynamic end of the first switch U3 ( That is, the IN terminal is connected to the BAT pin of the power management chip U2, and the non-moving terminals (ie, Y1, Y2 to Yn terminals) are respectively connected to the VBATT terminals of the plurality of batteries; the mobile terminal (ie, the IN terminal) of the second switch U4 is connected to the power supply. The TS pin of the management chip U2, the fixed ends (ie, Y1, Y2 to Yn terminals) are respectively connected to the TS ends of the plurality of batteries; the control ends of the first switch U3 and the second switch U4 (ie, C1, C2 to Cn terminals) Connected to a general purpose input and output port of processor chip U1.

In some embodiments, the first battery UB1, the second battery UB2 to the nth battery UBn are batteries of the same model, the first The default state of a switch U3 and the second switch U4 is to connect the first battery UB1 with the power management chip U2; the processor chip U1 is configured to control the switch to charge the first battery UB1, the second battery UB2 to the nth during charging The battery UBn is sequentially connected to the power management chip U2 for charging; and when the discharge is controlled, the switch is connected to the power management chip U2 in the reverse order of charging, that is, in FIG. 1, according to the nth battery UBn The second battery UB2 and the first battery UB1 are sequentially connected to the power management chip U2 for discharging.

Some embodiments of the present application also disclose a virtual reality headset, including a headset body and a strap. The virtual reality headset includes at least two batteries and a multi-cell power management circuit as shown in some embodiments above. The multi-battery power management circuit can be disposed on the body of the headset. The batteries of the virtual reality headset may be disposed on the body of the headset or separately on the body of the headset and on the strap.

In some embodiments, the virtual reality headset can include more than two batteries, such as n batteries, where n is an integer greater than two. At this point, the working principle of the multi-battery power management circuit is as follows:

The default state of the first switch U3 and the second switch U4 is that the IN terminal is connected to the Y1 terminal, that is, the first battery UB1 is connected to the circuit.

First of all: when the headset is activated after the charger is inserted, the processor chip U1 completes a series of configurations of the power management chip U2. At this time, the processor chip U1 communicates with the first fuel gauge UF1, the second fuel gauge UF2, and the nth fuel gauge UFn through the IIC bus, and acquires the amount of electricity of the first battery UB1, the second battery UB2 to the NBb at this time.

When the first battery UB1 to the UBn are both fully charged, the IN terminal of the first switch U3 and the second switch U4 are connected to the Y1 terminal, and the charger is unplugged at this time (the power management chip U2 can detect the insertion of the charger) And pulling out and informing the processor chip U1), the processor chip U1 controls the first switch U3 and the second switch U4 through the general-purpose input/output interface (including GPIOC1 to GPIOCn and GPIOT1 to GPIOTn) so that the IN terminal is connected to the Yn terminal. That is, the nth battery UBn is connected to supply power to the headset.

When the nth fuel gauge UFn detects that the electric quantity of the nth battery UBn is lower than the set threshold, the processor chip U1 controls the first switch U3 and the second switch U4 to have the IN terminal and the Yn-1 terminal (not shown). ) Connected, that is, the n-1th battery UBn-1 is used to supply power to the headset, and if the n-1 battery is too low, it continues to switch.

When the power of the nth battery UBn to the first battery UB1 is lower than the set discharge threshold, it is known that the power is insufficient, and the entire head device is turned off.

When the powers of the first battery UB1 to the UBn are not full, if the charger is inserted and charged, the processor chip U1 controls the first switch U3 and the second switch U4 to connect the IN terminal to the Y1 terminal. Charging the first battery UB1. When the first battery UB1 is full, the processor chip U1 controls the first switch U3 and the second switch U4 to connect the IN terminal to the Y2 terminal to charge the second battery UB2, and so on. The sequential charging of each battery is realized.

When the electric quantities of the first battery UB1 to the n-th battery UBn are both higher than the minimum amount but are not full, according to the foregoing In the order of discharge, the head-mounted device is turned on, and the processor chip U1 controls the first switch U3 and the second switch U4 to connect the IN terminal to the Yn terminal, and firstly supplies the n-th battery UBn to the head-mounted device to supply power thereto.

Since the first switch U3 and the second switch U4 are in the default state, the first battery UB1 is connected to the headset, the first battery UB1 is preferentially powered, and the nth battery UBn is preferentially used to power the headset. It is possible to make the amount of electric power of the first battery UB1 always lower than the amount of power of the second battery UB2 to the UBn subsequent thereto, so that the power supply to the head device can be supplied when the first battery UB1 is accessed in the default state.

2 is a circuit diagram showing still another embodiment of the multi-battery power management circuit of the present application, the multi-battery power management circuit in this embodiment for managing two batteries. The VDD and CELL pins of the first fuel gauge UF1 and the second fuel gauge UF2 of the circuit are respectively connected to the VBATT of the first battery UB1 and the second battery UB2 for detecting the power of the first battery UB1 and the second battery UB2. . The first switch U3 and the second switch U4 are connected to the IN terminal and the Y1 terminal by default, and the first battery UB1 is connected to the circuit. When the power levels of the first battery UB1 and the second battery UB2 are both lower than a set threshold, the head mounted device is turned off. When the power of the first battery UB1 and the second battery UB2 are not full, the charger is inserted at this time, and the processor chip U1 controls the first switch U3 and the second switch U4 to connect the IN terminal to the Y1 terminal, with priority A battery UB1 is charged. After the first battery UB1 is fully charged, the processor chip U1 connects the first terminal U3 and the second switch U4 to connect the IN terminal to the Y2 terminal to charge the second battery UB2. During discharge, the processor chip U1 controls the first switch U3 and the second switch U4 to connect the IN terminal to the Y2 terminal, and the second battery UB2 is preferentially discharged.

Some embodiments of the present application also disclose a virtual reality wearing device including two batteries, the virtual reality wearing device including a head device body and a strap and a multi-battery power management circuit, wherein two batteries are respectively disposed at the head The device body and the strap and the multi-battery power management circuit are disposed on the headset body, and the multi-battery management circuit can adopt the circuit structure as shown in FIG. 2.

The fuel gauge, the switch, the power management chip, and the processor chip used in some of the above embodiments are commercially available. The above embodiments are for the purpose of explanation, and no specific model is specified.

The multi-battery power management circuit in some embodiments of the present application can also be used in various electronic products such as mobile phones or smart bracelets, and details are not described herein.

Claims

A multi-battery power management circuit, characterized in that the circuit comprises: a plurality of fuel gauges, a switch, a power management chip and a processor chip;

Each of the fuel gauges is connected to one of the plurality of batteries for detecting the amount of power of the connected battery and transmitting the power to the processor chip;

The processor chip is connected to each of the fuel gauges, the power management chip, and the switch to obtain a power and a state of charge of each battery, and control the switch to switch to a corresponding battery;

The switch is configured to connect one of the plurality of batteries to the power management chip;

The power management chip is configured to discharge the connected battery or control the connected battery.
The multi-battery power management circuit according to claim 1, wherein said processor chip is further configured to:

Determining whether the battery capacity of the power management chip is full when charging, controlling the switching of the switch if full, connecting another battery to the power management chip;

When discharging, it is determined whether the battery power of the power management chip is lower than a discharge threshold, and if it is lower, the switch is controlled to switch, and another battery is connected to the power management chip.
The multi-battery power management circuit according to claim 1, wherein the circuit further comprises a power supply filter capacitor, wherein one end of the power supply filter capacitor is connected to a connection end of the power management chip and the switch, The other end of the power supply filter capacitor is grounded, the power supply filter capacitor is used for filtering, and the power supply process is not powered down when the switch is switched.
The multi-battery power management circuit according to claim 1, wherein the power management chip is connected to the processor chip through an IIC bus, and the STAT pin of the power management chip is connected to the processing. A general-purpose input/output port of the chip, the processor chip reading a status value of the power management chip through the universal input/output port.
The multi-battery power management circuit according to claim 1, wherein each of the fuel gauges is connected to the processor chip via an IIC bus, and the INT pins of each of the fuel gauges are respectively A universal input/output port connection of the processor chip, the processor chip reading an interrupt signal of each fuel gauge through the universal input and output port.
The multi-battery power management circuit according to claim 1, wherein a VDD pin and a CELL pin of each of the fuel gauges are connected to a VBATT end of the connected battery, and a CTG pin of each of the fuel gauges. Grounded to the GND pin.
The multi-battery power management circuit according to claim 1, wherein the control terminal of the switch is connected to a general-purpose input/output port of the processor chip, wherein the processor chip controls a switching action of the switch by using the universal input/output port.
The multi-battery power management circuit of claim 1 , wherein the switch comprises a first switch and a second switch, the first switch and the second switch being single-pole multi-throw switches;

a dynamic end of the first switch is connected to a BAT pin of the power management chip, and a fixed end of the first switch is respectively connected to a VBATT end of the plurality of batteries;

a dynamic end of the second switch is connected to a TS pin of the power management chip, and a fixed end of the second switch is respectively connected to a TS end of the plurality of batteries;

The control ends of the first switch and the second switch are respectively connected to one universal input and output port of the processor chip.
The multi-battery power management circuit of claim 1 , wherein the processor chip is further configured to control the switch to sequentially connect the plurality of batteries to the power management chip for charging when charging; And controlling the switching switch during discharge to connect the multi-battery to the power management chip for discharging in an order reverse to charging.
A virtual reality wearing device comprising a headgear body and a strap, wherein the virtual reality headset comprises at least two batteries and the multi-battery power management according to any one of claims 1-9 The multi-battery power management circuit is disposed on the headset device, and the batteries of the virtual reality headset are disposed on the headset device or respectively disposed on the headset device and On the strap.