Power delivery power supply which reduces power consumption in light-loaded status and related power delivery system

Abstract

The power delivery charger includes an active power factor correction circuit, an active clamp flyback converter circuit, a power delivery integrated circuit, an amplifier circuit, and a load detection and mode control circuit. When the load detection and mode control circuit determines that the output voltage is not under light load, the power delivery charger operates in normal mode, in which case the active power factor correction circuit supplies the power required by the active clamp flyback converter circuit. When the output voltage is determined to be under light load, the load detection and mode control circuit disables the active power factor correction circuit to allow the power delivery charger to operate in light load mode, in which case the amplifier circuit supplies the power required by the active clamp flyback converter circuit.

Claims

1. A power delivery (PD) charger capable of reducing energy loss under light load conditions, comprising: a first power supply pin for supplying an output voltage to a second power supply pin of a power delivery charging device; a first configuration channel pin for receiving a pull-down voltage when coupled to the second configuration channel pin of the power delivery charging device; a boost-type active power factor correction circuit for converting an AC voltage supplied by mains power into a DC voltage in a normal mode, and then converting the DC voltage into a first pulsating DC voltage, comprising: a first power switch comprising: a first terminal coupled to the DC voltage; a second terminal coupled to a first ground potential; and a control terminal for receiving a first control signal that periodically switches between a first enable potential and a first deactivation potential; and an active clamp flyback conversion circuit for converting the first pulsating DC voltage into a second pulsating DC voltage, comprising: A transformer for inducing the energy of a first pulsating DC voltage from a primary side to a secondary side to supply a second pulsating DC voltage, comprising: a primary winding disposed on the primary side, including a first dotted terminal and a first non-dotted terminal; and a secondary winding disposed on the secondary side, including a second dotted terminal and a second non-dotted terminal; a second power switch comprising: a first terminal coupled to the first non-dotted terminal; a second terminal coupled to a first ground potential; and a control terminal for receiving a second control signal that periodically switches between a second enabling potential and a second deactivating potential; and a blocking switch for selectively transmitting the second pulsating DC voltage to a first power supply pin to supply the output voltage, comprising: a first terminal coupled to the second non-dotted terminal; a second terminal coupled to the first power supply pin; and a control terminal for receiving a third control signal having a third enabling potential or a third deactivating potential; A power delivery integrated circuit is configured to: selectively provide a start signal based on the state of the first configuration channel pin; selectively provide a fourth control signal having either a fourth enable potential or a fourth deactivation potential based on an active power factor correction shutdown signal; an amplifier circuit selectively coupled between the DC voltage and the first dot terminal of the primary winding in the transformer based on the fourth control signal and the second pulsating DC voltage, for amplifying the DC voltage to provide the first pulsating DC voltage in a light load or shutdown mode; and a load judgment and mode control circuit coupled to the active clamp flyback switching circuit to receive a detection voltage related to the second pulsating DC voltage, for: selectively providing the active power factor correction shutdown signal based on the detection voltage; selectively providing a logic signal having either a first potential or a second potential based on the fourth control signal and the second pulsating DC voltage;The system selectively provides the first control signal based on the logic signal and the DC voltage; provides the second control signal based on the DC voltage; and selectively provides the third control signal having the third enable potential or the third deactivation potential based on the activation signal.

2. The power delivery charger as claimed in claim 1, wherein the load determination and mode control circuit comprises: a first microprocessor controller configured to receive the logic signal, and stop outputting the first control signal upon receiving the logic signal having the first potential, and output the first control signal that periodically switches between the first enable potential and the first deactivation potential upon receiving the logic signal having the second potential; a second microprocessor controller configured to: receive the detection voltage; determine that the output voltage is in a light load or zero load state when the value of the detection voltage is lower than a preset light load determination voltage, and output the active power factor correction off signal to the power delivery integrated circuit; determine that the output voltage is in a normal load state when the value of the detection voltage is not lower than the preset light load determination voltage, and stop outputting the active power factor correction off signal to the power delivery integrated circuit; The system outputs a third control signal with the third enable potential to turn on the blocking switch when the start signal is received; and outputs a third control signal with the third deactivation potential to turn off the blocking switch when the start signal is not received; and a logic circuit is configured to: receive the fourth control signal and the second pulsating DC voltage; when it is determined that the fourth control signal has a fourth enable potential and the second pulsating DC voltage has a fifth enable potential, output a logic signal with the first potential to the first microprocessor controller; and when it is determined that the fourth control signal has a fourth deactivation potential or the second pulsating DC voltage has a fifth deactivation potential, output a logic signal with the second potential to the first microprocessor controller.

3. The power delivery charger as claimed in claim 2, wherein the load determination and mode control circuit further includes: a first voltage divider resistor and a second voltage divider resistor connected in series between the DC voltage and the first ground potential, for dividing the DC voltage to provide the corresponding voltage divider.

4. The power delivery charger as described in claim 3, wherein: The load determination and mode control circuit is further used to calculate an amplification factor signal based on the voltage divider; and the amplifier circuit is further used to amplify the relevant DC voltage based on the amplification factor signal in the light load or shutdown mode, thereby providing the first pulsating DC voltage in the light load or shutdown mode.

5. The power delivery charger as claimed in claim 4, wherein the comparator circuit comprises: a first auxiliary switch comprising: a first terminal coupled to the DC voltage; a second terminal; and a control terminal coupled to the power delivery integrated circuit to receive the fourth control signal; a second auxiliary switch comprising: a first terminal coupled to the second terminal of the first auxiliary switch; a second terminal; and a control terminal coupled to the second pulsating DC voltage; and an amplifier comprising: a first terminal coupled to the second terminal of the second auxiliary switch; a second terminal coupled to the first dot terminal of the primary winding in the transformer; and a control terminal coupled to the second microprocessor controller to receive the amplification signal.

6. The power delivery charger as claimed in claim 1, wherein the power delivery integrated circuit is further configured to: output the fourth control signal having the fourth enable potential when the active power factor correction off signal is received; and output the fourth control signal having the fourth deactivation potential when the active power factor correction off signal is not received.

7. The power delivery charger as claimed in claim 1, wherein the power delivery integrated circuit is further configured to: output the start signal to the load determination and mode control circuit when it is determined, based on the state of the first configuration channel pin, that the device has been coupled to the second configuration channel pin of the power delivery receiving device, and the value of the pull-down voltage is within a predetermined voltage range.

8. The power delivery charger as claimed in claim 1, wherein: the boost-type active power factor correction circuit further comprises: an input capacitor, a first terminal of which is coupled to the DC voltage and a second terminal of which is coupled to the first ground potential, for storing the energy of the DC voltage; a boost inductor, comprising: a first terminal coupled to the first terminal of the input capacitor; and a second terminal coupled to the first terminal of the first power switch; a boost diode, comprising: an anode coupled to the second terminal of the boost inductor; and a cathode coupled to the first dot terminal; The circuit also includes a first energy storage capacitor for storing the energy of the first pulsating DC voltage, comprising: a first terminal coupled to the first dotted terminal; and a second terminal coupled to the first ground potential; and the active clamp flyback switching circuit further comprises: a magnetizing inductor comprising: a first terminal coupled to the first dotted terminal; and a second terminal coupled to the first non-dotted terminal; and an output diode comprising: an anode coupled to the second non-dotted terminal; and a cathode coupled to the first terminal of the blocking switch; and a second energy storage capacitor for storing the energy of the second pulsating DC voltage, comprising: a first terminal coupled to the cathode of the output diode; and a second terminal coupled to the second dot terminal and a second ground potential.

9. The power delivery charger as claimed in claim 1, wherein the active clamp flyback switching circuit further includes a detection resistor coupled between the second non-pointed terminal of the secondary winding of the transformer and the first terminal of the blocking switch, for providing the detection voltage.

10. A power delivery system comprising: a power delivery charger as claimed in any one of claims 1-9; a USB Type-C interface; and a power delivery receiving device, wherein the first power supply pin and the first configuration channel pin of the power delivery charger are respectively coupled to the second power supply pin and the second configuration channel pin of the power delivery receiving device through the USB Type-C interface.

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