# US 9,438,114 B2 · Methods and systems for energy recycling

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- Number: US 9,438,114 B2
- Document ID: US9438114B2
- Status: Granted
- Kind: B2
- Application number: 14/037,980
- Filed: 2013-09-26
- Published: 2015-03-26
- Granted: 2016-09-06
- Earliest claimed: 2013-09-26
- Applicants: Warren Allen Williams
- Inventors: Warren Allen Williams
- Web page: https://patentgrep.com/patent/US9438114B2

## CPC

- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)}
- H02M 3/1555: {for the generation of a regulated current to a load whose impedance is substantially inductive}
- Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
- 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

Methods and systems for energy recycling are described. One example energy recycler includes an input to receive an input voltage, an output to couple to an inductor, a resonant tank, a switching circuit coupled between the input, the output, and the resonant tank, and a controller coupled to the switching circuit. The controller is configured to control the switching circuit to selectively couple the input voltage to the output, and couple an induced voltage from the inductor to the resonant tank when the input voltage is decoupled from the inductor.

## Claims

### Claim 1

An energy recycler comprising:
an input configured to receive an input voltage and couple to a first battery and a second battery;
an output configured to couple to an inductor;
a resonant tank;
a switching circuit coupled between said input, said output, and said resonant tank;
an analog controller coupled to said switching circuit, said controller configured to:
control said switching circuit to selectively couple the input voltage to said output;
couple an induced voltage from the inductor to said resonant tank when the input voltage is decoupled from the inductor;
selectively couple the first battery to said input to provide the input voltage during a first period of time and selectively couples the second battery to said input to provide the input voltage during a second period of time; and
selectively couple energy stored in the resonant tank to a load, the load comprising the second battery during the first period of time and the first battery during the second period of time.

### Claim 2 (depends on 1)

An energy recycler in accordance with claim 1, wherein said resonant tank comprises a capacitor.

### Claim 3 (depends on 2)

An energy recycler in accordance with claim 2, wherein a self-resonant frequency of said capacitor is about the same as a self-resonant frequency of the inductor.

### Claim 4 (depends on 1)

An energy recycler in accordance with claim 1, wherein said output is configured to couple to a motor, and wherein the inductor comprises a winding of the motor.

### Claim 5 (depends on 4)

An energy recycler in accordance with claim 4, wherein said analog controller is configured to control said switching circuit to selectively couple the input voltage to said output to control operation of the motor.

### Claim 6 (depends on 1)

An energy recycler in accordance with claim 1, wherein the load comprises the inductor.

### Claim 7 (depends on 1)

An energy recycler in accordance with claim 1, said input is configured to receive the input voltage from at least one battery, and wherein the load comprises the at least one battery.

### Claim 8

A system comprising:
an electrical source configured to provide an input voltage, said electrical source comprising a first battery and a second battery;
a load;
an energy recycler coupled between said electrical source and said load, said energy recycler comprising:
an input coupled to said electrical source and configured to receive the input voltage;
an output coupled to the load;
a resonant tank;
a switching circuit coupled between said input, said output, and said resonant tank;
an analog controller coupled to said switching circuit, said controller configured to:
control said switching circuit to selectively couple the input voltage to an inductor;
couple an induced voltage from the inductor to said resonant tank when the input voltage is decoupled from said inductor;
selectively couple said first battery to said input to provide the input voltage during a first period of time and selectively couple said second battery to said input to provide the input voltage during a second period of time; and
selectively couple energy stored in the resonant tank to the second battery during the first period of time and selectively couple energy stored in the resonant tank to the first battery during the second period of time.

### Claim 9 (depends on 8)

A system in accordance with claim 8, wherein said energy recycler further comprises said inductor coupled between said input and said output.

### Claim 10 (depends on 8)

A system in accordance with claim 8, wherein said load comprises said inductor.

### Claim 11 (depends on 10)

A system in accordance with claim 10, wherein said load comprises an electric motor, and wherein said inductor comprises at least one winding of said electric motor.

### Claim 12 (depends on 11)

A system in accordance with claim 11, wherein said analog controller is configured to control said switching circuit to selectively couple the input voltage to said output to control operation of the motor.

### Claim 13 (depends on 8)

A system in accordance with claim 8, wherein said resonant tank comprises a capacitor.

### Claim 14 (depends on 12)

A system in accordance with claim 12, wherein a self-resonant frequency of said capacitor is about the same as a self-resonant frequency of the inductor.

### Claim 15 (depends on 8)

A system in accordance with claim 8, wherein said analog controller is configured to selectively couple energy stored in the resonant tank to the load.