CN111525681A

CN111525681A - Self-adaptive multi-capacity inverter system

Info

Publication number: CN111525681A
Application number: CN202010466466.6A
Authority: CN
Inventors: 谢志和
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2020-08-11

Abstract

The adaptive multi-capacity inverter system comprises at least two groups of subinverters, each subinverter comprises an independent H-bridge and a transformer, other components can be shared, the output ends of the subinverters are connected to an output control circuit, the output control circuit is externally connected with a load, the subinverters with corresponding capacities are determined to be started to output current supply loads according to the load conditions, and the control circuit can also select a plurality of subinverters to output the supply loads at the same time.

Description

Self-adaptive multi-capacity inverter system

Technical Field

The invention belongs to the field of power supplies, and particularly relates to the field of inverters.

Background

The inverter is divided into a power frequency inverter and a high frequency inverter, and the existing high frequency inverter is characterized by high conversion efficiency, but poor durability and load impact resistance. And the power frequency inverter is opposite, the efficiency is lower than that of a high-frequency machine, but the reliability, the durability and the impact load resistance are high. The two inverters share a common defect that the standby power consumption is relatively large, for example, a 48V3000 watt inverter, the standby power consumption is commonly about 30 watts, and even the best power frequency inverter in the market, the standby power consumption also reaches 20 watts. Although some manufacturers have introduced inverters with a so-called power-saving mode, the inverter is implemented by a frequent switching inverter operating circuit, and the inverter does not have a stable and uninterrupted ac power output in the power-saving mode. The circuit of a plurality of low-power consumption devices or high-power electric appliances under the standby working condition can not work stably, so that the energy-saving mode has little practical significance.

The present inventors have previously filed an invention patent application having the following application numbers: 201910198036.8, the application content is an inverter with built-in multi-transformer and capable of automatically switching transformers according to load conditions, but the scheme of the invention adopts a unique H bridge to correspond to a plurality of transformers, and a switch is needed in the middle, in the specific implementation process, there are some problems, including serious electric arc caused by overlarge closing current when using a common relay for switching, the service life of the relay can be reduced, the noise is difficult to inhibit when using a vacuum relay for switching, the use place is limited, and the inverter efficiency is reduced when using a solid relay or thyristor for switching because of overlarge internal resistance, so the application range is greatly limited.

Disclosure of Invention

To solve the above problems, the present invention provides an adaptive multi-capacity inverter system as follows.

Preferably, the inverter system is integrated in a box body, the H bridge of the inverter system can be integrated on the same mainboard, the same drive board is adopted for driving so as to reduce occupied space, only a triode is used as a signal switch between the drive board and the H bridge, and the H bridge is opened or closed according to the load condition. Multiple drive plates can be used to correspond to different H-bridges, which can reduce the load on a single drive plate.

The sub-inverters of the inverter system can have independent boxes, and the output control circuit can also have independent boxes, which can be used as a scheme for modification and upgrade for many motor homes already equipped with a common inverter, namely, the common inverter is set to be in a hard start state, a small inverter and an output control circuit are added, the small inverter is used for standby and low-load output at ordinary times, and when the output control circuit detects that the load power is increased, the common large inverter is started, and the load is switched to the large inverter.

Effects of the invention

The invention greatly reduces the standby power of the inverter, reduces the standby power of the power frequency inverter by 80-85%, reduces unnecessary electric quantity loss, and can save about 0.5 ℃ of electricity every 24 hours under the standby working condition, which accounts for 10-20% of the battery capacity of the current main motor home. In addition, the invention solves a series of problems which cannot be solved by the 201910198036.8 patent, thereby not only ensuring that the efficiency is not reduced, but also ensuring the use efficiency and eliminating the overlarge switching noise.

Drawings

FIG. 1 is a schematic diagram of the present invention.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The present invention will now be described in detail with reference to the accompanying drawings so that those skilled in the art can better understand the present invention.

FIG. 1 is a schematic diagram of the present invention. Two groups of subinverters, namely subinverter 1 and subinverter 2 are integrated in a case, and the output ends of the subinverters are connected with an output control circuit 3. The sub-inverter adopts a power frequency inverter and is provided with an independent H-bridge main board and a transformer. The subinverter 1 is a low-power inverter with the power of 200 watts and is responsible for outputting current in standby and low-power sections; the subinverter 2 is a high-power inverter, the power is 4000 watts, and a hard start mode is adopted to take over the subinverter 1 to output current when the load power exceeds the rated power of the subinverter 1. The output control circuit is controlled by an adjustable current induction switch, an output cable passes through the current induction switch, and the current induction switch sets the rated power current of the stator inverter 1 as a switching set value current; when the current is increased to a set value, the current induction switch is connected with the two-way signal relay, one way of the two-way signal relay is connected with the subinverter 2, the other way of the two-way signal relay is connected with the output switching relay, and the load is connected to the output. When the current is smaller than the set value, the current induction switch disconnects the two-way signal relay, the subinverter 2 is closed, and meanwhile, the output switching relay connects the load back to the upper surface of the output end of the subinverter 1.

The H-bridges of the two subinverters described in this embodiment are integrated on the same motherboard, and are driven by two independent drive boards.

The present embodiments are described in detail, but not limited thereto, and the scope of the present invention is defined by the appended claims.

Claims

1. A self-adaptive multi-capacity inverter system comprises at least two groups of subinverters, each subinverter comprises an independent H bridge and a transformer, and the output end of the subinverter is connected with an output control circuit.

2. An adaptive multi-capacity inverter system according to claim 1, wherein the sub-inverters comprise a power frequency inverter and a high frequency inverter, or the system has both a power frequency inverter and a high frequency inverter.

3. An adaptive multi-capacity inverter system according to claim 1, wherein the system is integrated in one chassis or distributed in different chassis.