US 12,237,671 B1
Internal power supply apparatus for auxiliary device supporting power delivery protocol
Liren Zhu, Beijing (CN)
Assigned to OSEE TECHNOLOGY LTD., Beijing (CN)
Filed by OSEE TECHNOLOGY LTD., Beijing (CN)
Filed on Jul. 12, 2024, as Appl. No. 18/770,735.
Int. Cl. H02J 1/08 (2006.01); H01M 10/42 (2006.01); G05F 1/46 (2006.01); H02M 3/158 (2006.01)
CPC H02J 1/08 (2013.01) [H01M 10/4264 (2013.01); G05F 1/46 (2013.01); H01M 2220/30 (2013.01); H02M 3/1582 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An internal power supply apparatus for an auxiliary device supporting a power delivery (PD) protocol, comprising: a battery interface, a universal serial bus-power delivery (USB-PD) power interface, a forward power supply circuit, a reverse power supply circuit, a power bus, a control bus and a power supply control circuit;
wherein a first input end of the forward power supply circuit is connected with a battery through the battery interface;
an input end of the power bus is connected with an output end of the forward power supply circuit, and an output end of the power bus is connected with an input end of the reverse power supply circuit, an input end of the power supply control circuit and an internal load of the auxiliary device;
an output end of the reverse power supply circuit is connected with a photographic device through the USB-PD power interface;
the power supply control circuit is configured to control, through the control bus, a voltage value output by the reverse power supply circuit;
the forward power supply circuit comprises a protection circuit and a selector;
the protection circuit is provided close to the first input end of the forward power supply circuit;
the selector is provided close to the output end of the forward power supply circuit, and a first input end of the selector is connected with an output end of the protection circuit;
the protection circuit comprises an n-channel metal-oxide semiconductor (NMOS) transistor, a capacitor and a diode which are connected in parallel, the NMOS transistor is provided towards a side of the internal power supply apparatus where the battery is arranged, and the capacitor and the diode are provided close to a side of the internal power supply apparatus where the internal load is arranged; and
a gate and a source of the NMOS transistor are connected with the battery interface, and a drain of the NMOS transistor is connected with one of the first input end or a second input end of the selector.