Power Transmission Apparatus and Control Method Therefor, and Power Supply System

• US 20180102706A1
• Filed: 09/12/2017
• Published: 04/12/2018
• Est. Priority Date: 03/13/2015
• Status: Active Grant

• Current Assignee: Positec Power Tools Company Limited (Positec Group Limited)
• Original Assignee: Positec Power Tools Company Limited (Positec Group Limited)
• Inventors: Gao, Zhendong, Mu, Guoliang, Liu, Fanshi
• Granted Patent: US 10,749,430 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H02J 7/007182 in response to battery voltage
• CPC Class Codes: H02J 7/007194 of the battery
• CPC Class Codes: H02J 7/02 for charging batteries from ac mains by converters
• CPC Class Codes: H02M 3/02 without intermediate conversion into ac
• CPC Class Codes: H02M 3/155 using semiconductor devices only
• CPC Class Codes: H02M 7/42 Conversion of dc power input into ac power output without possibility of reversal

Abstract

This invention discloses an electrical energy transmission apparatus. The electrical energy transmission apparatus includes an input component which is connected to a direct current (DC) energy storage component, an output component which comprises an alternating current (AC) device interface used to connect an AC device, and an adapter component which transfers electrical energy from the input component to the output component. The adapter component comprises a DC driving unit and an AC driving unit. The DC driving unit converts energy of the DC energy storage component into a DC power. The AC driving unit converts energy of the DC energy storage component into an AC power. At least one of the DC driving unit and the AC driving unit is connected to the AC device interface.

Claims

1. An electrical energy transmission apparatus, comprising:

an input component, connected to a direct current (DC) energy storage component;

an output component, comprising an alternating current (AC) device interface used to connect an AC device; and

an adapter component, transferring electrical energy from the input component to the output component, wherein

the adapter component comprises a DC driving unit and an AC driving unit, the DC driving unit converts energy of the DC energy storage component into a DC power, the AC driving unit converts energy of the DC energy storage component into an AC power, and at least one of the DC driving unit and the AC driving unit is connected to the AC device interface.

2. The electrical energy transmission apparatus according to claim 1, wherein the DC driving unit and the AC driving unit are alternatively connected to a same AC device interface.

3. The electrical energy transmission apparatus according to claim 1, wherein the DC driving unit and the AC driving unit are respectively connected to different AC device interfaces.

4. The electrical energy transmission apparatus according to claim 1, wherein the DC driving unit outputs a continuous DC power to the AC device interface.

5. The electrical energy transmission apparatus according to claim 1, wherein the DC driving unit outputs an intermittently interruptive DC power to the AC device interface.

6. The electrical energy transmission apparatus according to claim 5, wherein the DC power is periodically interrupted.

7. The electrical energy transmission apparatus according to claim 6, wherein duration of the DC power is greater than or equal to 20 ms.

8. The electrical energy transmission apparatus according to claim 5, wherein when a preset condition is met, the DC power is interrupted, and the preset condition is that the electrical energy transmission apparatus detects that a main switch of the AC device connected to the electrical energy transmission apparatus receives a turn-off instruction.

9. The electrical energy transmission apparatus according to claim 5, wherein when a preset condition is met, the DC power is interrupted, and the preset condition is that the electrical energy transmission apparatus detects that a working parameter of a main switch of the AC device connected to the electrical energy transmission apparatus meets an interruption condition.

10. The electrical energy transmission apparatus according to claim 5, wherein duration of the interruption is greater than or equal to 3 ms.

11. The electrical energy transmission apparatus according to claim 1, wherein the AC driving unit boosts and inverts electrical energy of the input component into an AC power.

12. The electrical energy transmission apparatus according to claim 11, wherein a maximum output power of the AC driving unit is less than or equal to 300 W.

13. The electrical energy transmission apparatus according to claim 1, wherein a peak value of the AC power is less than or equal to a voltage value at an input terminal of the AC driving unit.

14. The electrical energy transmission apparatus according to claim 1, wherein the AC driving unit gradually increases, in a soft start manner, a power of an AC power applied to the AC device interface.

15. The electrical energy transmission apparatus according to claim 2, wherein the adapter component further comprises a detection unit, a controller, and an output selection unit, the detection unit detects a working parameter related to a characteristic of the AC device, and the controller controls, according to a detection result of the detection unit, the output selection unit to alternatively output an AC power or a DC power.

16. The electrical energy transmission apparatus according to claim 15, wherein the detection unit detects a power of the AC device;

when determining that the power of the AC device is less than or equal to a preset value, the controller controls the output selection unit to output an AC power to the AC device interface; and

when determining that the power of the AC device is greater than a preset power value, the controller controls the output selection unit to output a DC power to the AC device interface.

17. The electrical energy transmission apparatus according to claim 16, wherein when the controller determines that the power of the AC device is greater than the preset power value, the controller further determines whether the AC device is suitable to be powered by a DC power, and when a determining result is yes, controls the output selection unit to output a DC power to the AC device interface, or when a determining result is no, controls the output selection unit stop outputting electrical energy to the AC device interface.

18. The electrical energy transmission apparatus according to claim 17, wherein a specific manner in which the controller further determines whether the AC device is suitable to be powered by a DC power is that, the detection unit detects an AC working current value of the electrical energy transmission apparatus that exists when an AC power is output to the AC device interface and a DC working current value of the electrical energy transmission apparatus that exists when a DC power is output to the AC device interface, when the DC working current value and the AC working current value meet a preset relationship, a determining result of the controller is yes, and when the DC working current value and the AC working current value meet a turn-off condition, a determining result of the controller is no.

19. The electrical energy transmission apparatus according to claim 18, wherein the preset relationship is:

the DC working current value is less than five times of the AC working current value.

20. The electrical energy transmission apparatus according to claim 18, wherein the turn-off condition is:

the DC working current value is greater than five times of the AC working current value;

or the DC working current value is greater than the AC working current value by more than 10 A.

21. The electrical energy transmission apparatus according to claim 18, wherein when the controller determines whether the AC device is suitable to be powered by a DC power, a power of an AC power or a DC power output to the AC device interface is restricted.

22. The electrical energy transmission apparatus according to claim 16, wherein in a process in which the output selection unit outputs an AC power to the AC device interface, if the detection unit detects that the power of the AC device is greater than the preset power value, the controller controls the output selection unit to output a DC power to the AC device interface.

23. The electrical energy transmission apparatus according to claim 16, wherein in a process in which the output selection unit outputs a DC power to the AC device interface, if the detection unit detects that the power of the AC device is less than or equal to the preset power value, the controller controls the output selection unit to output an AC power to the AC device interface.

24. A control method for an electrical energy transmission apparatus, wherein the control method comprises the following steps:

connecting an alternating current (AC) device to an AC device interface of an electrical energy transmission apparatus;

detecting a power of the AC device;

when the power of the AC device is less than or equal to a preset power value, outputting an AC power to the AC device interface; and

when the power of the AC device is greater than the preset power value, outputting a direct current (DC) power to the AC device interface.

25. The control method according to claim 24, wherein before the outputting a DC power to the AC device interface, the control method further comprises the following steps:

determining whether the AC device is suitable to be powered by a DC power, and if a determining result is yes, outputting a DC power to the AC device interface, or if a determining result is no, stopping outputting electrical energy to the AC device interface.

26. The control method according to claim 25, wherein the step of determining whether the AC device is suitable to be powered by a DC power is:

outputting an AC power to the AC device interface;

detecting an AC working current of the electrical energy transmission apparatus;

outputting a DC power to the AC device interface;

detecting a DC working current of the electrical energy transmission apparatus; and

if a DC working current value and an AC working current value meet a preset relationship, a determining result is yes, and if the DC working current value and the AC working current value meet a turn-off condition, a determining result is no.

27. A power supply system, wherein the power supply system comprises a direct current (DC) energy storage component and an electrical energy transmission apparatus comprising:

an input component, connected to the DC energy storage component;

an output component, comprising an alternating current (AC) device interface used to connect an AC device; and

an adapter component, transferring electrical energy from the input component to the output component, wherein

the adapter component comprises a DC driving unit and an AC driving unit, the DC driving unit converts energy of the DC energy storage component into a DC power, the AC driving unit converts energy of the DC energy storage component into an AC power, and at least one of the DC driving unit and the AC driving unit is connected to the AC device interface.

28. The power supply system according to claim 27, wherein the DC energy storage component comprises a primary energy storage module, a secondary energy storage module, and a tertiary energy storage module;

the primary energy storage module is a battery pack detachably mounted on the electrical energy transmission apparatus;

the secondary energy storage module is a standard battery unit located in the battery pack, and the standard battery unit has an output terminal that outputs a voltage;

the DC energy storage component comprises multiple secondary energy storage modules;

the secondary energy storage module comprises multiple tertiary energy storage modules; and

the tertiary energy storage module is a cell located in the secondary energy storage module.

29. The power supply system according to claim 28, wherein an adapter component comprises a conversion circuit, an input terminal of the conversion circuit is connected to the input component, an output terminal of the conversion circuit is connected to the DC driving unit and the alternating current (AC) driving unit, and the conversion circuit connects the secondary energy storage module in series and/or in parallel.

30. The power supply system according to claim 29, wherein the conversion circuit comprises multiple different series-parallel circuits.