Battery powered device with pre-powered circuit

Information

  • Patent Grant
  • 10923943
  • Patent Number
    10,923,943
  • Date Filed
    Monday, March 19, 2018
    6 years ago
  • Date Issued
    Tuesday, February 16, 2021
    3 years ago
Abstract
A battery powered device includes a battery pack, at least one switch, a power management chip, and a pre-powered circuit. The pre-powered circuit comprises a buck and current-limiting module. The buck and current-limiting module comprises at least one zener diode and at least one current-limiting resistor. When the switch is turned off, the battery pack will be powered to a system device by the pre-powered circuit. Thus, the battery pack can be powered to the system device by the pre-powered circuit even if the battery powered device is operated in a standby mode. Besides, the power management chip can be operated in the standby state when the battery powered device is powered by the pre-powered circuit, so as to reduce the consumption of the battery energy and therefore extend the powered time of the battery powered device.
Description

This non-provisional application claims priority claim under 35 U.S.C. ยง 119 (a) on China Patent Application No. 201710974637.4 filed Oct. 19, 2017, the entire contents of which are incorporated herein by reference.


FIELD OF THE INVENTION

The present invention relates to a battery powered device, particularly to a battery powered device capable of providing a standby power.


BACKGROUND

In order to avoid the power outage occurred during the system device performing the important task, the system device is able to be connected to an external battery powered device. When the power outage occurs, the required standby power that the system device performs the important task can be provided by the discharging of the system device.


In the past, the battery powered device is provided with a DC power converter (such as switched power converter or linear power converter) in the inside thereof. The battery powered device can buck the voltage of battery to the required working voltage of the system device by the DC power converter so as to power to the system device.


In general, the DC power converter is having the high cost of components that will increase the hardware cost of the battery powered device, and is having the higher power consumption that will easily cause the loss of battery energy, and is easy over-discharging during the discharging process, resulting in the damage of battery cell. Besides, a power management chip must be waked up when the battery powered device is powered via the DC power converter, so that the operation of the DC power converter can be controlled by the power management chip. However, the power management chip in a normal operation state is easy to cause that the battery energy of the battery powered device is exhausted quickly.


SUMMARY

It is one objective of the present invention to provide a battery powered device, which comprises a battery pack, at least one switch, a power management chip, and a pre-powered circuit. The battery pack can be powered to a system device via the pre-powered circuit even if the battery powered device is operated in a power-saving standby mode. Besides, the power management chip can be operated in a standby state when the battery powered device is powered to the system device via the pre-powered circuit, so as to reduce the consumption of the battery energy and therefore extend the powered time of the battery powered device.


It is another objective of the present invention to provide a battery powered device, in which the pre-powered circuit comprises a buck and current-limiting module. The buck and current-limiting module comprises at least one zener diode and at least one current limiting resistor. The discharging energy of the battery pack can be powered to the system device via the zener diode and the current limiting resistor. Thus, a minimum discharge voltage of the battery pack is limited by a voltage drop of the zener diode, a discharging current is limited by the current limiting resistor, thereby the thing that the battery pack is over-discharging and therefore damaged can be avoided.


It is another objective of the present invention to provide a battery powered device, wherein the pre-powered circuit further comprises a temperature protection module. When an operation temperature of the buck and current-limiting module exceeds a temperature threshold, the temperature protection module will generate a high impedance, so that a current loop between the battery pack, the pre-powered circuit, and the system device will be disconnected by the high impedance of the temperature protection module, in such a way that the buck and current-limiting module can avoid to be powered to the system device when over-heating, thereby the safety on the powered can be ensured.


To achieve the above objective, the present invention provides a battery powered device, which is used for providing a power to a system device, the battery powered device comprising: a battery pack consisted of a plurality of batteries; at least one switch connected between the battery powered device and the system device; a power management chip, connected to the switch, used for controlling the turning on or the turning off of the switch; and a pre-powered circuit connected between the battery pack and the system device, wherein the pre-powered circuit comprises a buck and current-limiting module, the buck and current-limiting module comprises at least one zener diode and at least one current limiting resistor, the zener diode is connected to the current-limiting resistor in a series, the battery pack is powered to the system device by the pre-powered circuit when the switch is turned off.


In one embodiment of the present invention, the switch is turned off by the controlling of the power management chip before an operation mode of the power management chip is to be transferred from a normal operation mode to a standby operation mode.


In one embodiment of the present invention, the pre-powered circuit further comprises a temperature protection module, the temperature protection module is connected to the buck and current-limiting module, and used for sensing an operation temperature of the buck and current-limiting module, a current loop between the battery pack, the pre-powered circuit, and the system device will be disconnected by the temperature protection module when the operation temperature of the buck and current-limiting module exceeds a temperature threshold.


In one embodiment of the present invention, the temperature protection module is an impedance element of positive temperature coefficient.


In one embodiment of the present invention, the temperature protection module is a thermistor, a polysilicon fuse, or a circuit breaker.


In one embodiment of the present invention, when the power management chip is operated in a normal operation mode, the switch will be turned on by the controlling of the power management chip, the battery pack is powered to the system device by the switch.


In one embodiment of the present invention, the power management chip receives a waking signal, the operation mode of the power management chip is transferred from the standby operation mode to the normal operation mode according to the waking signal.


In one embodiment of the present invention, the switch is a JFET, a MOSFET, a BJT, or a Relay.





BRIEF DESCRIPTION OF THE DRAWINGS


FIG. 1 is shown a circuit diagram of a battery powered device according to one embodiment of the present invention.



FIG. 2 is shown a circuit construction diagram of a buck and current-limiting module of a pre-powered circuit according to the present invention.





DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 1, there is shown a circuit diagram of a battery powered device according to one embodiment of the present invention. As shown in FIG. 1, the battery powered device 10 of the present invention is connected to a system device 20, and used to be powered to the system device 20. The battery powered device 10 comprises a battery pack 11, a power management chip 13, at least one switch 15, and a pre-powered circuit 17. The battery pack 11 is consisted of a plurality of batteries in serial. The switch 15 is connected between the battery pack 11 and the system device 20. The switch 15 can be a JFET (Junction Field Effect Transistor), a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), a BJT (Bipolar junction Transistor), or a Relay. The pre-powered circuit 17 is connected between the battery pack 11 and the system device 20, and it is a bypass powered circuit.


The power management chip 13 is connected to the switch 15, used for controlling the turning on or the turning off of the switch 15. When the power management chip 13 is operated in a normal operation mode, it will issue an enable signal to the switch 15, so that the switch 15 is turned on according to the enable signal, and a discharging energy of the battery pack 11 is powered to the system device 20 via the switch 15 turned on. In the contrary, before the operation mode of the power management chip is to be transferred from a normal operation mode to a standby operation mode, the power management chip 13 will issue a disable signal to switch 15 so that the switch 15 is turned off according to the disable signal. Afterwards, when the switch 11 is turned off and the power management chip 13 is operated in the standby operation mode, the discharging energy of the battery pack 11 will be powered to the system device 20 via the pre-powered circuit 17. Accordingly, a normal powered loop is formed between the battery pack 11, the switch 15, and the system device 20, and a bypass powered loop is formed between the battery pack 11, the pre-powered circuit 17, and the system device 20.


As shown in FIGS. 1 and 2, the pre-powered circuit 17 comprises a buck and current-limiting module 18. The buck and current-limiting module 18 comprises at least one zener diode 181 and at least one current limiting resistor 183. The zener diode 181 and the current limiting resistor 183 are connected together in a series. When the power management chip 13 is operated in the standby operation mode, the zener diode 181 can buck the battery voltage of the battery pack 11 to the required operating voltage of the system device 20, and the current limiting resistor 183 can limit the discharging current of the battery pack 11 within a current range allowed by the system device 20. Thus, the discharging energy of the battery pack 11 is powered to the system device 20 via the buck and current-limiting module 18. Besides, a minimum discharge voltage of the battery pack 11 is limited by a voltage drop of the zener diode 181, a discharging current of the battery pack 11 is limited by the current limiting resistor 183, thereby the thing that the battery pack 11 is over-discharging and therefore damaged can be avoided. In the present invention, the number of dispositions of the zener diodes 181 can be decided according to the required operation voltage of the system device 20, and the number of dispositions of the current limiting resistors 183 can be decided according to the current range allowed by the system device 20.


Accordingly, the battery pack 11 can still be powered to the system device 20 via the pre-powered circuit 17 when the battery powered device 10 of the present invention is operated in the power-saving standby mode, while the power management chip 13 operated in the standby state will reduce the consumption of battery energy of battery pack 11 so as to extend the powered time of the battery powered device 10.


Sequentially, the power management chip 13 is able to receive a waking signal, which is issued by the system device 20 or an external control device. When the power management chip 13 receives the waking signal, the operation mode of the power management chip 13 is able to be transferred from the standby operation mode to the normal operation mode according to the waking signal, and then the power management chip 13 sends an enable signal to the switch 15 so that the switch 15 can be again turned on by the enable signal.


The pre-powered circuit 17 further comprises a temperature protection module 19. The buck and current-limiting module 18 is connected to the system device 20 via the temperature protection module 19. In one embodiment of the present invention, the temperature protection module 19 is an impedance element of positive temperature coefficient, for example, thermistor, polysilicon fuse, or circuit breaker. An impedance value of the temperature protection module 19 will increase following to the temperature. The temperature protection module 19 is used for sensing an operation temperature of the buck and current-limiting module 18. When the operation temperature of the buck and current-limiting module 18 exceeds a temperature threshold, the temperature protection module 19 will generate a high impedance, so that the current loop between the battery pack, the pre-powered circuit, and the system device will be disconnected by the high impedance of the temperature protection module 19. By the configuration of the temperature protection module 19, the buck and current-limiting module 18 can avoid to be powered to the system device 20 when over-heating, thereby the safety on the powered can be ensured.


The above disclosure is only the preferred embodiment of the present invention, and not used for limiting the scope of the present invention. All equivalent variations and modifications on the basis of shapes, structures, features and spirits described in the claims of the present invention should be included in the claims of the present invention.

Claims
  • 1. A battery powered device, which is used for providing a power to a system device, the battery powered device comprising: a battery pack consisted of a plurality of batteries;at least one switch connected between the battery powered device and the system device;a power management chip, connected to the switch, used for controlling the turning on or the turning off of the switch according to an operation mode of the power management chip; anda pre-powered circuit including an input, an output, and a buck and current-limiting module, wherein the input is connected between the switch and the battery pack, the output is connected between the switch and the system device, the buck and current-limiting module comprises at least one zener diode and at least one current limiting resistor in series with each other between the input and the output;when the power management chip is operated in a normal operation mode, the switch is configured to be turned on by the controlling of the power management chip, the battery pack is configured to power the system device via the switch and the pre-powered circuit; when the power management chip is operated in a standby operation mode, the switch is configured to be turned off by the controlling of the power management chip, the battery pack is configured to power the system device via the pre-powered circuit.
  • 2. The battery powered device according to claim 1, wherein the pre-powered circuit further comprises a temperature protection module configured between the buck and current-limiting module and the output, the zener diode, the current limiting resistor, and the temperature protection module in series with each other between the input and the output, the temperature protection module is a polysilicon fuse or an impedance element of positive temperature coefficient; when an operation temperature of the buck and current-limiting module exceeds a temperature threshold, the temperature protection module will generate a high impedance, such that a current loop between the battery pack, the pre-powered circuit, and the system device is configured to be disconnected by the high impedance of the temperature protection module.
  • 3. The battery powered device according to claim 1, wherein the switch is a JFET, a MOSFET, a BJT, or a Relay.
  • 4. The battery powered device according to claim 1, wherein the switch is configured to be turned off by the controlling of the power management chip before the operation mode of the power management chip is to be transferred from the normal operation mode to the standby operation mode.
  • 5. The battery powered device according to claim 4, wherein the power management chip is configured to receive a waking signal, the operation mode of the power management chip is configured to be transferred from the standby operation mode to the normal operation mode according to the waking signal.
Priority Claims (1)
Number Date Country Kind
2017 1 0974637 Oct 2017 CN national
US Referenced Citations (86)
Number Name Date Kind
4260956 Harford Apr 1981 A
4528492 Inaniwa Jul 1985 A
5045768 Pelly Sep 1991 A
5506991 Curry Apr 1996 A
5646501 Fishman Jul 1997 A
6160375 Horie Dec 2000 A
6275002 Chen Aug 2001 B1
6331764 Oglesbee Dec 2001 B1
7154234 Romano Dec 2006 B2
7274116 Inoue Sep 2007 B2
7579716 Sato Aug 2009 B2
7880434 White Feb 2011 B2
7969121 Smith Jun 2011 B2
8035251 Lai Oct 2011 B2
8119275 Lee Feb 2012 B2
8120326 Heinrich Feb 2012 B2
8330436 Oraw Dec 2012 B2
8575894 White Nov 2013 B2
8829722 Kusch Sep 2014 B2
8847554 Sunderlin Sep 2014 B2
8890494 Gasperi Nov 2014 B2
8912769 Lin Dec 2014 B2
8922166 White Dec 2014 B2
9077196 Sim Jul 2015 B2
9099871 White Aug 2015 B2
9172303 Vasadi Oct 2015 B2
9219366 Kim Dec 2015 B2
9318952 Oraw Apr 2016 B2
9525301 White Dec 2016 B2
9711962 Andrea Jul 2017 B2
10033204 Huang Jul 2018 B2
10199844 Horie Feb 2019 B2
10250043 White Apr 2019 B2
10578675 Liang Mar 2020 B2
20010019256 Olsson Sep 2001 A1
20020085837 Yang Jul 2002 A1
20030179034 Melis Sep 2003 A1
20030232237 Nakagawa Dec 2003 A1
20040036446 Iwashima Feb 2004 A1
20050219864 Furukoshi Oct 2005 A1
20060006850 Inoue Jan 2006 A1
20060139021 Taurand Jun 2006 A1
20060186867 Kataoka Aug 2006 A1
20080013236 Weng Jan 2008 A1
20080129219 Smith Jun 2008 A1
20080150364 Chen Jun 2008 A1
20090009136 Heinrich Jan 2009 A1
20090153124 Ishii Jun 2009 A1
20090289599 White Nov 2009 A1
20090322304 Oraw Dec 2009 A1
20100008117 Luthi Jan 2010 A1
20100149706 Lee Jun 2010 A1
20110089901 White Apr 2011 A1
20110095615 Li Apr 2011 A1
20110130983 Yang Jun 2011 A1
20120080945 Vasadi Apr 2012 A1
20120086400 White Apr 2012 A1
20120206116 Fricker Aug 2012 A1
20120274295 Lin Nov 2012 A1
20120319658 White Dec 2012 A1
20130051101 Cao Feb 2013 A1
20130058141 Oraw Mar 2013 A1
20130121048 Gasperi May 2013 A1
20130187619 Dunipace Jul 2013 A1
20130221924 Sim Aug 2013 A1
20140002003 Kim Jan 2014 A1
20140009106 Andrea Jan 2014 A1
20140028259 White Jan 2014 A1
20140159681 Oraw Jun 2014 A1
20150054479 Shiwaya Feb 2015 A1
20150295427 White Oct 2015 A1
20150295494 Gong Oct 2015 A1
20150340894 Horie Nov 2015 A1
20160016483 Yasunori Jan 2016 A1
20160064963 Huang Mar 2016 A1
20160064965 White Mar 2016 A1
20160181918 Herfurth Jun 2016 A1
20160301235 Okanoue Oct 2016 A1
20170201109 Meacham, II Jul 2017 A1
20170271863 Andrea Sep 2017 A1
20170271864 Andrea Sep 2017 A1
20170271865 Andrea Sep 2017 A1
20180034365 Sicard Feb 2018 A1
20180337536 Li Nov 2018 A1
20190148782 Chang May 2019 A1
20190227127 Liang Jul 2019 A1
Foreign Referenced Citations (1)
Number Date Country
2000324841 Nov 2000 JP
Related Publications (1)
Number Date Country
20190123579 A1 Apr 2019 US