# US 10,483,872 B2 · Power supply system and energy storage system

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- Number: US 10,483,872 B2
- Document ID: US10483872B2
- Status: Granted
- Kind: B2
- Application number: 15/086,218
- Filed: 2016-03-31
- Published: 2016-10-06
- Granted: 2019-11-19
- Earliest claimed: 2015-03-31
- Assignees: General Electric Company
- Applicants: General Electric Company
- Inventors: Fei Li
- Web page: https://patentgrep.com/patent/US10483872B2

## CPC

- H02M 7/537: using semiconductor devices only, e.g. single switched pulse inverters
- B60L 1/006: {to power outlets}
- B60L 1/14: to electric lighting circuits
- B60L 50/40: using propulsion power supplied by capacitors
- B60L 58/20: having different nominal voltages
- G05F 1/46: wherein the variable actually regulated by the final control device is DC (G05F1/625 takes precedence)
- H02M 3/158: including plural semiconductor devices as final control devices for a single load
- B60L 2210/10: DC to DC converters
- H02M 3/156: with automatic control of output voltage or current, e.g. switching regulators
- H02M 3/1584: {with a plurality of power processing stages connected in parallel}
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/72: Electric energy management in electromobility
- 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)
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- G05F: SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A power supply system to provide auxiliary power output comprising a first energy storage device, a first inverter coupled to the first energy storage device, a first transformer, a first diode and a capacitor. The first inverter includes a first switch and second switch in series. The first transformer transforms high voltage from the first energy storage device to the low voltage output from auxiliary power output terminal, and includes the primary winding and auxiliary winding. The primary winding is connected to the first energy storage device and the junction of the first and second switch, and the homonymous terminal of the secondary winding is connected to the auxiliary power output through the first diode, with the synonymous terminal connected to the earth. One end of the first capacitor is connected to the first diode cathode and the other end is connected to the earth.

## Claims

### Claim 1

A power supply system, comprising:
an auxiliary power supply output terminal for providing an auxiliary power supply;
a first energy storage device;
a first converter comprising a first switch and a second switch which are series-connected, wherein the first converter is coupled to the first energy storage device;
a first transformer that transforms a high voltage from the first energy storage device into a low voltage output from the auxiliary power supply output terminal and comprising a primary winding and a secondary winding, wherein the primary winding of the first transformer is connected between the first energy storage device and a connecting point of the first and the second switches, and a first terminal of the secondary winding of the first transformer is connected to the auxiliary power supply output terminal via a first diode and an opposite terminal thereof is grounded; and
a first capacitor, wherein one terminal of the first capacitor is connected to a negative electrode of the first diode and the other terminal thereof is grounded.

### Claim 2 (depends on 1)

The power supply system of claim 1, further comprising:
a filter circuit coupled between a connecting point of the first diode and the first capacitor and the auxiliary power supply output terminal.

### Claim 3 (depends on 2)

The power supply system of claim 2, wherein the filter circuit comprises:
a low drop regulator, wherein an input of the low drop regulator is coupled to the connecting point of the first diode and the first capacitor; and
a second capacitor, wherein one terminal of the second capacitor is connected to an output of the low drop regulator and the other terminal thereof is grounded.

### Claim 4 (depends on 1)

The power supply system of claim 1, wherein a number of turns of the secondary winding of the first transformer, N12, is selected according to the following equation:
N
12
=
N
11
×
V
m
V
1
where N11 represents a number of turns of the primary winding of the first transformer, V1 represents a voltage of the first energy storage device, and Vm represents a voltage at a connecting point of the first diode and the first capacitor.

### Claim 5 (depends on 1)

The power supply system of claim 1, further comprising:
a second energy storage device; and
a second converter comprising a third switch and a fourth switch which are series-connected, wherein the second converter is coupled to the second energy storage device and output terminals of the second converter are connected together with output terminals of the first converter.

### Claim 6 (depends on 5)

The power supply system of claim 5, wherein the first energy storage device comprises a battery and the second energy storage device comprises an ultracapacitor; or the first energy storage device comprises an ultracapacitor and the second energy storage device comprises a battery.

### Claim 7 (depends on 5)

The power supply system of claim 5, further comprising:
a second transformer that transforms a high voltage from the second energy storage device into the low voltage and comprising a primary winding and a secondary winding, wherein the primary winding of the second transformer is connected between the second energy storage device and a connecting point of the third and the fourth switches, and a first terminal of the secondary winding of the second transformer is connected to a connecting point of the first diode and the first capacitor via a second diode and an opposite terminal thereof is grounded.

### Claim 8 (depends on 7)

The power supply system of claim 7, further comprising:
a filter circuit coupled between the connecting point of the first diode and the first capacitor and the auxiliary power supply output terminal.

### Claim 9 (depends on 8)

The power supply system of claim 8, wherein the filter circuit comprises:
a low drop regulator, wherein an input of the low drop regulator is coupled to the connecting point of the first diode and the first capacitor; and
a second capacitor, wherein one terminal of the second capacitor is connected to an output of the low drop regulator and the other terminal thereof is grounded.

### Claim 10 (depends on 7)

The power supply system of claim 7, wherein a number of turns of the secondary winding of the second transformer, N22, is selected according to the following equation:
N
22
=
N
21
×
V
m
V
2
wherein N21 represents a number of turns of the primary winding of the second transformer, V2 represents a voltage of the second energy storage device, and Vmrepresents a voltage at the connecting point of the first diode and the first capacitor.

### Claim 11

An energy storage system, comprising:
a power supply system having an auxiliary power supply output terminal for providing an auxiliary power supply and comprising:
a first energy storage device;
a first converter comprising a first switch and a second switch which are series-connected, wherein the first converter is coupled to the first energy storage device and output terminals of the first converter are connected to a DC link load;
a first transformer that transforms a high voltage from the first energy storage device into a low voltage output from the auxiliary power supply output terminal and comprising a primary winding and a secondary winding, wherein the primary winding of the first transformer is connected between the first energy storage device and a connecting point of the first and the second switches, and a first terminal of the secondary winding of the first transformer is connected to the auxiliary power supply output terminal via a first diode and an opposite terminal thereof is grounded; and
a first capacitor, wherein one terminal of the first capacitor is connected to a negative electrode of the first diode and the other terminal thereof is grounded; and
an energy management system that controls the first energy storage device.

### Claim 12 (depends on 11)

The energy storage system of claim 11, further comprising:
a filter circuit coupled between a connecting point of the first diode and the first capacitor and the auxiliary power supply output terminal.

### Claim 13 (depends on 12)

The energy storage system of claim 12, wherein the filter circuit comprises:
a low drop regulator, wherein an input of the low drop regulator is coupled to the connecting point of the first diode and the first capacitor; and
a second capacitor, wherein one terminal of the second capacitor is connected to an output of the low drop regulator and the other terminal thereof is grounded.

### Claim 14 (depends on 11)

The energy storage system of claim 11, wherein a number of turns of the secondary winding of the first transformer, N12, is selected according to the following equation:
N
12
=
N
11
×
V
m
V
1
where N11 represents a number of turns of the primary winding of the first transformer, V1 represents a voltage of the first energy storage device, and Vm represents a voltage at a connecting point of the first diode and the first capacitor.

### Claim 15 (depends on 11)

The energy storage system of claim 11, further comprising:
a second energy storage device; and
a second converter comprising a third switch and a fourth switch which are series-connected, wherein the second converter is coupled to the second energy device, output terminals of the second converter are connected together with the output terminals of the first converter, and the energy management system is further configured to control the second energy storage device.

### Claim 16 (depends on 15)

The energy storage system of claim 15, further comprising:
a second transformer that transforms a high voltage from the second energy storage device into the low voltage and comprising a primary winding and a secondary winding, wherein the primary winding of the second transformer is connected between the second energy storage device and a connecting point of the third and the fourth switches, and a first terminal of the secondary winding of the second transformer is connected to a connecting point of the first diode and the first capacitor via a second diode and an opposite terminal thereof is grounded.

### Claim 17 (depends on 16)

The energy storage system of claim 16, further comprising:
a low drop regulator, wherein an input of the low drop regulator is coupled to the connecting point of the first diode and the first capacitor; and a second capacitor, wherein one terminal of the second capacitor is connected to an output of the low drop regulator and the other terminal thereof is grounded.

### Claim 18 (depends on 16)

The energy storage system of claim 16, wherein a number of turns of the secondary winding of the second transformer, N22, is selected according to the following equation:
N
22
=
N
21
×
V
m
V
2
wherein N21 represents a number of turns of the primary winding of the second transformer, V2 represents a voltage of the second energy storage device, and Vm represents a voltage at the connecting point of the first diode and the first capacitor.

### Claim 19 (depends on 11)

The energy storage system of claim 11, wherein the DC link load comprises an electric drive system of an electric vehicle.

### Claim 20 (depends on 11)

The energy storage system of claim 11, wherein the DC link load comprises an inverter and a power grid connecting with the inverter.