# US 11,451,081 B2 · Charging device supporting power delivery

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- Number: US 11,451,081 B2
- Document ID: US11451081B2
- Status: Granted
- Kind: B2
- Application number: 16/987,992
- Filed: 2020-08-07
- Published: 2021-10-07
- Granted: 2022-09-20
- Earliest claimed: 2020-04-01
- Assignees: Acer Incorporated
- Applicants: Acer Incorporated
- Inventors: Tzu-Tseng Chan
- Web page: https://patentgrep.com/patent/US11451081B2

## CPC

- H02J 7/06: using discharge tubes or semiconductor devices
- H02J 7/80: including monitoring or indicating arrangements
- H02M 3/33592: {having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer}
- H02J 7/00: Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
- H02J 7/02: for charging batteries from AC mains by converters
- H02J 7/96: in response to battery voltage
- H02J 2207/20: Charging or discharging characterised by the power electronics converter
- H02M 1/32: Means for protecting converters other than automatic disconnection
- H02M 3/33523: {with galvanic isolation between input and output of both the power stage and the feedback loop}
- Y02B 40/00: Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A charging device supporting PD (Power Delivery) includes a bridge rectifier, a first capacitor, a transformer, a power switch element, an output stage circuit, a feedback compensation circuit, a PWM (Pulse Width Modulation) IC (Integrated Circuit), a discharging circuit, and a controller. The bridge rectifier generates a rectified voltage according to a first input voltage and a second input voltage. The transformer includes a main coil and a secondary coil. The main coil receives the rectified voltage, and the secondary coil generates an induced voltage. The output stage circuit generates an output voltage according to the induced voltage and a first control voltage. The controller generates the first control voltage and a second control voltage according to the output voltage. The discharging circuit selectively reduces the voltage level of the output voltage according to the second control voltage.

## Claims

### Claim 1

A charging device for supporting PD (Power Delivery), comprising:
a bridge rectifier, generating a rectified voltage according to a first input voltage and a second input voltage;
a first capacitor, storing the rectified voltage;
a transformer, comprising a main coil and a secondary coil, wherein the main coil receives the rectified voltage, and the secondary coil generates an induced voltage;
a power switch element, selectively coupling the main coil to a ground;
an output stage circuit, generating an output voltage according to the induced voltage and a first control voltage;
a feedback compensation circuit, coupled to the output stage circuit, and generating a feedback voltage, wherein the feedback compensation circuit comprises a linear optical coupler and a voltage regulator;
a PWM (Pulse Width Modulation) IC (Integrated Circuit), generating a PWM voltage according to the feedback voltage;
a controller, monitoring the output voltage, and generating the first control voltage and a second control voltage according to the output voltage; and
a discharging circuit, selectively reducing a voltage level of the output voltage according to the second control voltage;
wherein the linear optical coupler comprises an LED (Light-Emitting Diode) and a BJT (Bipolar Junction Transistor), wherein the LED has an anode coupled to a fourth node, and a cathode coupled to a fifth node, and wherein the BJT has a collector coupled to a sixth node for outputting the feedback voltage, and an emitter coupled to the ground;
wherein the feedback compensation circuit further comprises:
a fourth capacitor, wherein the fourth capacitor has a first terminal coupled to the sixth node, and a second terminal coupled to the ground; and
a fifth capacitor, wherein the fifth capacitor has a first terminal coupled to the fifth node, and a second terminal coupled to a seventh node.

### Claim 2 (depends on 1)

The charging device as claimed in claim 1, wherein the bridge rectifier comprises:
a first diode, wherein the first diode has an anode coupled to a first input node for receiving the first input voltage, and a cathode coupled to a first node for outputting the rectified voltage;
a second diode, wherein the second diode has an anode coupled to the ground, and a cathode coupled to the first input node;
a third diode, wherein the third diode has an anode coupled to a second input node for receiving the second input voltage, and a cathode coupled to the first node; and
a fourth diode, wherein the fourth diode has an anode coupled to the ground, and a cathode coupled to the second input node;
wherein the first capacitor has a first terminal coupled to the first node, and a second terminal coupled to the ground.

### Claim 3 (depends on 2)

The charging device as claimed in claim 2, wherein the main coil has a first terminal coupled to the first node for receiving the rectified voltage, and a second terminal coupled to a second node, wherein the power switch element selectively couples the second node to the ground according to the PWM voltage, and wherein the secondary coil has a first terminal coupled to a third node for outputting the induced voltage, and a second terminal coupled to a ground voltage.

### Claim 4 (depends on 3)

The charging device as claimed in claim 3, wherein the output stage circuit comprises:
a first transistor, wherein the first transistor has a control terminal for receiving a clock voltage, a first terminal coupled to the fourth node, and a second terminal coupled to the third node for receiving the induced voltage; and
a second capacitor, wherein the second capacitor has a first terminal coupled to the fourth node, and a second terminal coupled to the ground voltage.

### Claim 5 (depends on 4)

The charging device as claimed in claim 4, wherein the output stage circuit further comprises:
a second transistor, wherein the second transistor has a control terminal for receiving the first control voltage, a first terminal coupled to an output node for outputting the output voltage, and a second terminal coupled to the fourth node; and
a third capacitor, wherein the third capacitor has a first terminal coupled to the output node, and a second terminal coupled to the ground voltage.

### Claim 6 (depends on 5)

The charging device as claimed in claim 5, wherein the feedback compensation circuit further comprises:
a first resistor, wherein the first resistor has a first terminal coupled to the fourth node, and a second terminal coupled to the seventh node; and
a second resistor, wherein the second resistor has a first terminal coupled to the seventh node, and a second terminal coupled to the ground voltage.

### Claim 7 (depends on 6)

The charging device as claimed in claim 6, wherein the voltage regulator has an anode coupled to the ground voltage, a cathode coupled to the fifth node, and a reference terminal coupled to the seventh node.

### Claim 8 (depends on 7)

The charging device as claimed in claim 7, wherein the discharging circuit comprises:
a third transistor, wherein the third transistor has a control terminal for receiving the second control voltage, a first terminal coupled to an eighth node, and a second terminal coupled to the output node.

### Claim 9 (depends on 8)

The charging device as claimed in claim 8, wherein the discharging circuit further comprises:
a fifth diode, wherein the fifth diode has an anode coupled to the eighth node, and a cathode coupled to a ninth node; and
a sixth capacitor, wherein the sixth capacitor has a first terminal coupled to the ninth node, and a second terminal coupled to the ground voltage.

### Claim 10 (depends on 9)

The charging device as claimed in claim 9, wherein the discharging circuit further comprises:
a third resistor, wherein the third resistor has a first terminal coupled to the fourth node, and a second terminal coupled to the ninth node; and
an inductor, wherein the inductor has a first terminal coupled to the eighth node, and a second terminal coupled to the ground voltage.

### Claim 11 (depends on 10)

The charging device as claimed in claim 10, wherein the controller comprises:
a comparator, wherein the comparator has a positive input terminal coupled to a tenth node for receiving the output voltage, a negative input terminal for receiving a reference voltage, and an output terminal for outputting the second control voltage.

### Claim 12 (depends on 11)

The charging device as claimed in claim 11, wherein the controller further comprises:
a fourth transistor, wherein the fourth transistor has a control terminal for receiving the first control voltage, a first terminal coupled to the ground voltage, and a second terminal coupled to the tenth node.

### Claim 13 (depends on 12)

The charging device as claimed in claim 12, wherein the controller further comprises:
a timer, wherein when the second control voltage rises to a high logic level, the timer starts to count a predetermined time period; and
a driver, controlled by the timer, wherein when the second control voltage falls to a low logic level or when the predetermined time period has expired, the driver pulls up the first control voltage to a driving level.