CROSS-REFERENCE TO RELATED APPLICATION
The present application claims the benefit of Chinese Patent Application for Invention No. 201710685370.7 for a POGO CONNECTOR BASED SOFT POWER START SOLUTION filed Aug. 11, 2017, which is hereby incorporated by reference in its entirety.
FIELD OF THE INVENTION
The present invention relates to charging methods for mobile terminals or similar apparatuses. More particularly, the present invention relates to soft power start solutions based on two pin POGO connectors.
BACKGROUND
Generally speaking, traditional charging cradle's power is always turned on at the docking connector. If a mobile terminal is docked into a charging cradle, the power of the charging cradle may burn the contact interface by an electrical arc at the moment of contact.
Traditional soft power start solutions may be implemented to ensure that no power is applied on the contact interface at the moment of contact. These solutions may need three contact points, e.g., VDD, GND, and DETECT between the terminal and charging cradle.
Therefore, a need exists for a soft power start solution based on a two pin connector, such as a two pin POGO connector.
SUMMARY
Accordingly, in one aspect, the present invention embraces systems and methods for a soft power start solution based on a two pin connector for a device such as a mobile terminal. When a charging pad of the device is first docked to a charging cradle, the charging pad of the device is connected to a plunger in a ground pin, but power is not applied at that moment. In a separate step, the plunger is shorted to a spring flat that allows power to be applied to the charging pad. Similar steps occur during de-docketing. With this method, contact interface burn caused by electrical arcing when docking or de-docking a mobile terminal from a charging cradle may be minimized.
In an exemplary embodiment, a soft power start solution comprises a mobile terminal comprises a charging pad; a charging cradle comprising a two pin POGO connector, a spring flat, and a printed circuit board. The two pin POGO connector comprises a GND pin and a VDD pin, with the GND pin and the VDD pin each comprising a plunger, a coil spring and a barrel. The spring flat enables or disables power applied to the charging pad. The soft start solution also includes the printed circuit board with through holes, wherein the barrels of the two pin POGO connector are soldered around the through holes on one side of the printed circuit board, such that the pins can pass through the through holes, and the spring flat soldered on an opposite side of the printed circuit board in proximity to a through hole associated with the GND pin. The soft start solution also comprises a power block that is coupled to the spring flat.
If the mobile terminal is docked to the charging cradle, the charging pad is connected to at least the two pin POGO connector. If a separate force caused by the mobile terminal is applied to the plunger of the GND pin, the GND pin is in contact with the spring flat causing the mobile terminal to begin charging.
The coil spring generates a pressure that prevents the plunger of the GND pin from extending out of the barrel on the opposite side of the printed circuit board, unless the separate force caused by the mobile terminal is applied to the plunger of the GND pin. If the separate force caused by the mobile terminal is applied to the plunger of the GND pin, the separate force overcomes the pressure of the coil spring and causes the plunger of the GND pin to extend out of the barrel of the GND pin. If the mobile terminal is not docked to the charging cradle, the plunger of the GND pin is not connected to the spring flat. If the charging pad is connected to the GND pin before connecting the spring flat to the GND pin, an occurrence of electrical arcing at the charging pad of the mobile terminal is minimized.
In another exemplary embodiment, a charging cradle comprises a two pin connector, which further comprises a GND pin and a VDD pin, with the GND pin and the VDD pin each comprising a plunger, a coil spring and a barrel; and a spring flat capable of enabling or disabling power to the charging cradle by connecting to a power block; and a printed circuit board with the two pin connector located on one side of the printed circuit board, and the spring flat located on an opposite side of the printed circuit board. After the plunger of the GND pin connects with a device, a force is then applied to the plunger of the GND pin causing the plunger of the GND pin to extend through a hole of the printed circuit board and causing the GND pin to be connected with the spring flat. Power is then applied to the GND pin to charge the device. The power block is coupled to the spring flat to provide power. The device may be a mobile terminal. If the plunger of the GND pin is not connected to the spring flat, the power is not applied to the device. If the device is docked with the charging cradle, the plunger of the GND pin extends to the opposite side of the printed circuit board, causing a connection with the spring flat.
In yet another exemplary embodiment, a method for a soft power start solution for a mobile terminal comprising the steps of: i) constructing a charging cradle with a two pin connector, a spring flat and a printed circuit board; ii) positioning the two pin connector on one side of the printed circuit board, wherein the two pin connector comprises a GND pin and a VDD pin with the GND pin and the VDD pin each comprising a plunger, a coil spring and a barrel; iii) positioning the spring flat on an opposite side of the printed circuit board in proximity to the GND pin, wherein the spring flat is coupled to a power block; and iv) charging the mobile terminal based on a docketing status of the mobile terminal and the charging cradle. By connecting a charging pad of the mobile terminal to the GND pin before connecting the spring flat to the GND pin, an occurrence of electrical arcing at the charging pad of the mobile terminal is minimized.
The method further comprises the step of not docking the mobile terminal with the charging cradle. Since the spring flat is not connected with the GND pin, the power block is not active, and power is not applied to the two pin connector. The method further comprises the step of initially docking the mobile terminal with the charging cradle, causing the plunger of the GND pin to contact with the charging pad of the mobile terminal. Since the plunger of the GND pin does not extend to cause the spring flat to short with the GND pin, the power block is not active, and power is not applied to the two pin connector.
The method further comprises the steps of: i) docking the mobile terminal with the charging cradle; and ii) pressing the plunger of the GND pin to extend to the opposite side of the printed circuit board to allow the GND pin to be connected to the spring flat. Since the power block is active and power is applied to the two pin connector of the charging cradle, the charging cradle begins to charge the mobile terminal.
The method further comprises the step of further pressing the plunger of the GND pin to extend the plunger of the GND pin a maximum distance on the other side of the printed circuit board. Since the spring flat remains shorted with the GND pin, the power block remains active, and power from the two pin connector of the charging cradle continues to be applied to the mobile terminal. If the spring flat vibrates, the mobile terminal continues to charge the mobile terminal
The method further comprises the step of removing the mobile terminal from the charging cradle, causing a disconnect of the plunger of the GND pin with the spring flat. Since the spring flat is not connected with the GND pin, the power block is not active, and the charging cradle stops charging the mobile terminal. The charging pad of the mobile terminal and the two pin connector remain connected during removal of the mobile terminal from the charging cradle.
The method further comprises the step of removing the mobile terminal from the charging cradle, causing the plunger of a ground pin to disconnect with charging pad of the mobile terminal. Since the spring flat is not connected with GND pin earlier than the plunger of a ground pin to disconnect with the charging pad of the mobile terminal, the power block is not active, and there is no power applied to the two pin connector during removal of the device from the charging cradle.
The barrels of two pin connector are soldered around through holes on the one side of the printed circuit board. A pressure of the coil spring prevents the plunger of the GND pin from extending out of its barrel on the opposite side of the printed circuit board. If a force is applied to the plunger of the GND pin, the plunger of the GND pin extends through a hole in the printed circuit board and is connected to the spring flat causing the GND pin to be coupled to the power block.
The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates an embodiment of a mobile terminal charging pad of a mobile terminal.
FIG. 2 illustrates an exemplary embodiment of a two pin POGO connector installed on a printed circuited board.
FIG. 3A illustrates an exemplary embodiment of a system for a soft based power start charging solution.
FIG. 3B illustrates an exemplary embodiment of a power block of a charging cradle coupled to a two pin POGO connector.
FIG. 4A illustrates several exemplary embodiments of charging conditions for the soft based power start charging solution based on two POGP pins.
FIG. 4B illustrates several other exemplary embodiments of charging conditions for the soft based power start charging solution based on two POGP pins.
FIG. 5 illustrates an exemplary embodiment of a flowchart depicting the steps to charge a mobile terminal using a soft power start charging solution based on two POGP pins.
DETAILED DESCRIPTION
The present invention embraces charging methods for mobile terminals or similar apparatuses, and more specifically relates to a soft power start solution based on 2 pin connectors such as a POGO two pin connector.
For 2 Pin connector charging cradles (such as iPod 5 Homebase, Quad-charging base), traditional charging cradle's power is always on to the docking connector. When a mobile terminal docks into a charging cradle, the power of the charging cradle may burn the contact interface by an electrical arc during the moment of contact. Some customer complaints include the ipod5/iPhone5 Sled's Charging Flat being burned after a long time period of docking with the charging cradle.
For many of Honeywell's Enterprise Mobile terminals (such as D75e, CT50, iPhone 6 Sled), a traditional soft power start solution may be implemented to ensure there is minimal or no power on the contact interface at the moment of contact. In this case, the power at the contact interface may be enable after terminal docking, and then there is no electrical arc burns in the moment of docking. Therefore, the reliability of the contact interface is good.
But the traditional soft power start solutions (for example: D75e, CT50, iPhone 6 Sled) may need at least 3 contact points such as VDD, GND, and DETECT between terminal and charging cradle. For the other mobile terminal (such as EDA50, TAIS), a charging contact interface has to be designed with 2 contact points due to ID, Cost, Antenna performance impact. Thus, there is need for a soft power start solution based on a two pin connector, such as a two pin POGO connector.
FIG. 1 illustrates an embodiment of a mobile terminal 100 with a mobile terminal charging pad 102. Mobile terminal charging pad 102 has two pins.
FIG. 2 illustrates an exemplary embodiment 200 of a two pin POGO connector and spring flat 212 installed on a printed circuited board (PCB) 214. The two pin POGO connector comprises GND pin 204 and VDD pin 202. GND pin 204 further comprises plunger 206, coil spring 208, and barrel 210.
The PCB 214 with barrels of two pin POGO connector that may be soldered around through holes on one side of a printed circuit board. The spring flat may be soldered on another side of the printed circuit board in proximity to a through hole associated with the GND pin;
FIG. 3A illustrates an exemplary embodiment of a system 300 for a soft based power start charging solution. The solution includes a charging cradle 314, which comprises VDD pin 302 (not shown), GND pin 304 and its associated plunger 306, coil spring 308, barrel 310, spring flat 312. Coupled to the spring flat 312 via the printed circuit board is power block 320. Mobile terminal 316 comprises a charging pad 318.
The charging cradle 314 with a 2 Pin POGO connector, may be designed with a customized GND pin 304 of the 2 Pin POGO connector: 1) plunger 306 may not extend out barrel 310 from one side (top side)to the other side (bottom side) due to the pressure caused by coil spring 308; 2) plunger 306 may extend out barrel 310 to the other side (bottom side) when plunger 306 is pressed by charging pad 318.The 2 Pin POGO connector barrels may be soldered around the through holes of PCB 315 and the spring flat 312 on the other side of PCB 315.
In operations: 1) plunger 306 may not short to spring flat 312 without pressure. This may be the situation when mobile terminal 316 is not docked into charging cradle 314; 2) Plunger 306 may short to the spring flat 312 if plunger 306 is pressed from the top side. This may be the situation when mobile terminal 316 is docked into charging cradle 314. The spring flat 312 may be used to enable or disable the power (in an active low mode) in charging cradle 314.
Specifically, 1) when mobile terminal 316 is not docked into charging cradle 314, spring flat 312 is not shorted to ground. Power block 320 is open because the voltage on spring flat is pulled high causing no power to be applied to the two pin Pogo connector of the charging cradle 314: 2) when mobile terminal 316 is docked into charging cradle 314, spring flat 312 is shorted to ground and power block 320 is active because spring flat 312 is shorted to ground (i.e., a low voltage). In this case, power is applied to the two pin Pogo connector of the charging cradle 314.
In an exemplary embodiment 340, FIG. 3B illustrates a power block 350 with charging cradle 354 that is coupled to a two pin POGO connector. Charging cradle 354 comprises GND pin 344 and VDD pin 342. Power block 350 comprises power block circuit 345 and PoGo pin switch 346.
When mobile terminal 316 is pressed on the two pin PoGo connector, a DET signal may result. This means that when mobile terminal 316 presses on GND pin 304, plunger 306 is shorted to spring flat 312 causing spring flat 312 to be pulled low since PoGo pin switch 346 is active (X1 is coupled to Y1 in PoGo pin switch 346). (References to elements of FIG. 3A and FIG. 3B)
FIG. 4A and 4B illustrates several exemplary embodiments (embodiment400 and embodiment 420) of charging conditions for the soft power start charging solution based on a two POGO pin connector. In the following paragraphs, references are made to elements of FIG. 3A, which illustrates of a system for a soft based power start charging solution.
The solution is customized by soldering, on one side (top side) of the 2 Pin POGO connector, barrel 310 around a through hole of PCB 315. Then a spring flat 312 may be soldered on the other side (bottom side) of PCB 315. The plunger 306 of GND Pin 304 of the two pin POGO connector may extend out from bottom side of PCB 315 and shorted to spring flat 312, if the plunger 306 is pressed from top side. Spring flat 312 may connect to a low voltage activated power block 320, and spring flat 312 is pulled up to high voltage by a resistor in the power block 320.
Condition 1 401: Mobile terminal 316 is not docking into the charging Cradle. At this moment: spring flat 312 is not shorted with GND. Power block 320 is not active and no power is applied on the POGO connector of charging cradle 314;
Condition 2 402: Docking mobile terminal 316 into the charging cradle 314, and the plunger 306 may contact with mobile terminal's charging pad 318 first. At this moment: the plunger 306 of GND pin 304 is not extended out of the back side Therefore, spring flat is not shorted with GND pin 304, power block 320 is not active and no power is applied on the POGO connector of the charging cradle. So there is no or minimal electrical arc between charging cradle's POGO Connector and Mobile terminal's charging Pad.
Condition 3 403: Docking mobile terminal316 into the charging cradle 314, plunger 306 of GND pin 304 is extending out of the back side and then is shorted to the spring flat 312. At this moment: spring flat 312 is shorted with GND pin 304, power block 320 is active, and power on the POGO connector of charging cradle 314 begins to power the mobile terminal 316. Due to charging cradle's POGO Connector and mobile terminal's charging pad 318 already being shorted, there is also no or minimal electrical arc at charging pad 318 at this moment.
Condition 4 404: Docking mobile terminal 316 into the charging cradle 314 a maximum amount, plunger 306 of GND pin 304 is kept shorted to the spring flat 312. At this moment: spring flat 312 is still shorted with GND pin 304, power block 320 is still active, power on the POGO connector of charging cradle 314 keeps power to mobile terminal 316. Due to charging cradle's POGO Connector and Mobile terminal's charging pad 318 already shorted, there is no or minimal electrical arc at charging pad 318 this moment also.
Condition 5 405: Mobile terminal 316 may vibrator charging cradle 314 between “Condition 3” and “condition 4”, plunger 306 of GND pin 304 is kept short to the spring flat 312. For this condition: spring flat 312 is still shorted with GND pin 304, power block 320 is still active, power on the POGO connector of charging cradle 314 keeps power to mobile terminal 316. Due to charging cradle's POGO Connector and mobile terminal's charging pad 318 is kept short, there is no electrical arc at the charging pad 318 at this moment also.
Condition 6 406: Remove mobile terminal 316 from the charging cradle 314, plunger 306 of GND pin 304 is kept open from the spring flat 312. At this moment: spring flat 312 is not shorted with GND pin 304, power block 320 is not active, charging cradle 314 stops applying power to mobile terminal 316. Due to charging cradle's POGO Connector and mobile terminal's charging pad 318 is kept shorted, there is no electrical arc at charging pad 318 this moment.
Condition 7 407: Remove mobile terminal 316 from the charging cradle 314, plunger 306 of POGO connector may disconnect with mobile terminal's charging pad 318. At this moment: spring flat 312 is still not shorted with GND, power block 320 is kept not active, there is no power on the POGO connector of charging cradle 314. So there is no electrical arc at this moment even with charging cradle's POGO Connector disconnecting from mobile terminal's charging pad 318.
If charging pad 318 is connected to GND pin 304 before shorting spring flat 312 to GND pin 304, an occurrence of electrical arcing at charging pad 318 of mobile terminal 316 is minimized. In this case, the electrical resistance between spring flat 312 and plunger 306 of GND pin 304 increases by no more than 10%.
If spring flat 312 vibrates, mobile terminal 316 continues to charge mobile terminal 316 so long as spring flat 312 maintains a contact with plunger 306 of GND pin 304. Typically, the extended potion of spring flat 312 may vibrate no more than 10 degrees from its original position
FIG. 5 illustrates an exemplary embodiment of a flowchart 500 depicting the steps to charge a mobile terminal using a soft power start charging solution based on two POGP pins. Flowchart 500 includes conditions 1-7 that were previously illustrated in FIG. 4A and FIG. 4B. The steps described below include references to components in FIG. 3A. The steps include:
Condition 1: Mobile terminal 316 is not docking into the charging cradle 314 (step 501)
Condition 2: Initially docking the mobile terminal 316 with the charging cradle 314, causing the plunger 306 of the GND pin 304 to contact with the charging pad 318. (step 502)
Condition 3: Docking the mobile terminal 316 with the charging cradle 314, and pressing plunger 306 of the GND pin 304 to extend to the other side of the printed circuit board 315to allow the GND pin 304 to be shorted to the spring flat 312. (step 503)
Condition 4: Further pressing the plunger 306 of the GND pin 304 to extend the plunger 306 of the GND pin 304 a maximum distance on the other side of the printed circuit board. (step 504)
Condition 5: If the spring flat 312 vibrates, the mobile terminal 316 continues to charge the mobile terminal 316. (step 505)
Condition 6: Removing the mobile terminal 316 from the charging cradle 314, causing a disconnect of the plunger 306 of GND pin 304 with the spring flat 312 (step 505)
Condition 7: Removing the mobile terminal 316 from the charging cradle 314, causing the plunger 306 of two pin POGO connector to disconnect with charging pad 318 of the mobile terminal 316. This means the plunger 306 is disconnected from GRN pin. (step 507)
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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation.
Patent Application
20190052026
