doc: overall improvement
This commit is contained in:
parent
3001cc643a
commit
0c4987cd21
43
README.md
43
README.md
|
@ -1,4 +1,4 @@
|
||||||
the PD blocker removes Power Delivery (PD) capabilities from USB-C connections
|
The PD blocker removes Power Delivery (PD) capabilities from USB-C connections and provides over-voltage protection.
|
||||||
|
|
||||||
<img src="picture/v2_front.webp" title="front" height="250"/>
|
<img src="picture/v2_front.webp" title="front" height="250"/>
|
||||||
<img src="picture/v2_back.webp" title="back" height="250"/>
|
<img src="picture/v2_back.webp" title="back" height="250"/>
|
||||||
|
@ -6,41 +6,44 @@ the PD blocker removes Power Delivery (PD) capabilities from USB-C connections
|
||||||
purpose
|
purpose
|
||||||
=======
|
=======
|
||||||
|
|
||||||
some USB-C devices do not require the Power Delivery features available on the connector, mainly higher voltage and current.
|
Some USB-C devices do not require the Power Delivery features available on USB-C, mainly higher voltage and current.
|
||||||
the device might not even be rated for higher voltages.
|
The device could not even be rated for higher voltages.
|
||||||
mischievous eMarked cables (with PD-capable chips built in) or chargers might raise the voltage without the device requesting it.
|
But chargers might be stuck at higher voltage, or mischievous eMarked cables (with PD-capable chips built in) could raise the voltage, permanently damaging it.
|
||||||
the higher voltage could then damage the device.
|
|
||||||
|
|
||||||
the PD blocker protects your [expensive] USB-C device from such damages.
|
The PD blocker protects your [expensive] USB-C device from such damages.
|
||||||
|
|
||||||
usage
|
usage
|
||||||
=====
|
=====
|
||||||
|
|
||||||
insert the PD blocker in line, between the power source (e.g. charger or host computer), cable, and your device.
|
Insert the PD blocker in line, between the power source (e.g. charger or host computer), cable, and your device.
|
||||||
it can be inserted between any two of these components, and will work the same.
|
It can be inserted between any two of these components, and will work the same.
|
||||||
plug and receptacle can be either side, and it is reversible along the axis of the connectors (like normal USB-C connectors).
|
Plug and receptacle can be either side, and it is reversible along the axis of the connectors (like normal USB-C connectors).
|
||||||
|
|
||||||
PD communication is completely block.
|
The PD blocker will prevent any Power Delivery communication, such as raising the voltage.
|
||||||
when over-voltage is detected (Vbus > 5.5V), power is cut and an OVP LED indicating the culprit side lights up.
|
And when over-voltage is detected (Vbus > 5.5V), power is cut and an OVP LED indicating the culprit side lights up.
|
||||||
|
Connect the PD blocker before the target device for the protection to take effect before it can reach it.
|
||||||
|
|
||||||
all other features of USB-C are preserved (e.g. USB2, USB3, USB4, SBU, orientation detection)
|
All other features of USB-C are preserved (e.g. USB2, USB3, USB4, SBU, orientation detection)
|
||||||
some alternate modes requiring PD communication will not work anymore though.
|
Some alternate modes requiring PD communication will not work anymore though.
|
||||||
|
|
||||||
mode of operation
|
mode of operation
|
||||||
=================
|
=================
|
||||||
|
|
||||||
to prevent PD communication, capacitors are placed on the CC lines.
|
To prevent PD communication, capacitors are placed on the CC lines.
|
||||||
they smooth out the 300 Kbps BMC signal used for PD communication.
|
They smooth out the 300 Kbps BMC signal used for PD communication.
|
||||||
it still allows the identification of Rp, Rd, and Ra used for orientation and role detection.
|
It still allows the identification of Rp, Rd, and Ra used for orientation and role detection.
|
||||||
|
|
||||||
additionally there is an over-voltage protection circuit.
|
Additionally there is an over-voltage protection circuit.
|
||||||
VBUS (on either side) is compared to a reference voltage.
|
VBUS (on either side) is compared to a reference voltage.
|
||||||
when VBUS is below 5.5V, p-channel MOSFETs are switched on, and allow VBUS going from one side to the other.
|
When VBUS is below 5.5V, p-channel MOSFETs are switched on, and allow VBUS going from one side to the other.
|
||||||
when VBUS is above 5.5V, the p-channel MOSFETs are switched off, and prevent VBUS interconnection, cutting the power.
|
When VBUS is above 5.5V, the p-channel MOSFETs are switched off, and prevent VBUS interconnection, cutting the power.
|
||||||
|
|
||||||
warning
|
warning
|
||||||
=======
|
=======
|
||||||
|
|
||||||
the PD blocker can block up to 36V.
|
The PD blocker can block up to 36V.
|
||||||
PD rev 2.0 specifies voltages up to 20V.
|
PD rev 2.0 specifies voltages up to 20V.
|
||||||
PD rev 3.0 specifies voltages up to 48V, but I haven't seen any power source using this new capability yet.
|
PD rev 3.0 specifies voltages up to 48V, but I haven't seen any power source using this new capability yet.
|
||||||
|
|
||||||
|
The PD blocker can take a seconds (at 5.6V) until the over-voltage protection take effect.
|
||||||
|
Connect the PD blocker before the target device for the protection to take effect before it can reach it.
|
||||||
|
|
Loading…
Reference in New Issue