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LLC circuit for high-power charger with wide output voltage range and control method of LLC circuit

A high-power charging, voltage range technology, applied in battery circuit devices, current collectors, circuit devices, etc., can solve problems such as low work efficiency, inability to achieve ultra-wide voltage output range, etc., to achieve the effect of satisfying wide output voltage

Pending Publication Date: 2020-08-28
SHENZHEN CLICK TECH +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to overcome the deficiencies of the prior art, and propose a LLC circuit and its control method for high-power chargers with a wide output voltage range, so as to solve the problem that the current high-power LLC circuit has low working efficiency and cannot realize ultra-wide The problem with voltage output range

Method used

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  • LLC circuit for high-power charger with wide output voltage range and control method of LLC circuit
  • LLC circuit for high-power charger with wide output voltage range and control method of LLC circuit
  • LLC circuit for high-power charger with wide output voltage range and control method of LLC circuit

Examples

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Effect test

Embodiment 1

[0013] This example proposes a figure 1 The shown LLC circuit for a high-power charger with a wide output voltage range includes a transformer, first to fourth diodes D1-D4, switching devices and a switching device control circuit. The primary series resonant capacitor and resonant inductance of the transformer; the secondary winding includes four groups, namely the first winding N1, the second winding N2, the third winding N3 and the fourth winding N4. The first end of the third winding N3 is connected to the anode of the third diode D3, the second end of the third winding N3 is connected to the first end of the first winding N1, the second end of the first winding N1 is connected to the first end of the second winding N2, and the second end of the third winding N3 is connected to the first end of the second winding N2. The second end of the second winding N2 is connected to the first end of the fourth winding N4, the second end of the fourth winding N4 is connected to the an...

Embodiment 2

[0021] This embodiment is similar to Embodiment 1, providing a kind of figure 2 Compared with Embodiment 1, the shown LLC circuit for a high-power charger with a wide output voltage range is different only in the circuit of the switching device. The part of the switching device in this embodiment is realized by using the relay K1. Such as figure 2 As shown, when the switching device control circuit receives a high-level signal to make Q2 conduct, the normally open contacts p and m of the relay K1 are connected, so that the two lines D3 and D4, which were originally suspended, are connected. The rest of the principle is the same as Embodiment 1 is the same and will not be repeated here.

Embodiment 3

[0023] This embodiment provides a circuit control method, which can be used to control the LLC circuit of the aforementioned embodiment for a wide output voltage range high-power charger, including: when the voltage of the battery exceeds half of the full-charged state voltage, the switch The device control circuit outputs a high level signal, so that the switch device control circuit controls the switch device to conduct.

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Abstract

The invention discloses an LLC circuit for a high-power charger with a wide output voltage range and a control method of the LLC circuit. The LLC circuit comprises a transformer, a first diode, a second diode, a third diode, a fourth diode, a switching device and a switching device control circuit, wherein the secondary side of the transformer comprises four windings which are sequentially connected in series, when the electric quantity of the battery is less than half, the switching device is in an off state, and the first and second windings and the first and second diodes form a full-wave rectification circuit to output voltage; when the electric quantity of the battery exceeds half of full charge, the battery MCU outputs a high-level signal to the switching device control circuit, andthe switching device control circuit controls the switching device to be conducted, so that the third winding, the third diode, the fourth winding and the fourth diode are connected to the circuit, the first diode and the second diode are reversely cut off, and the first winding, the third winding, the third diode, the second winding, the fourth winding and the fourth diode form a full-wave rectification circuit to output voltage.

Description

technical field [0001] The invention relates to the technical field of charger circuits, in particular to an LLC circuit for a high-power charger with a wide output voltage range and a control method thereof. Background technique [0002] In recent years, with the rise of artificial intelligence products, the demand for lithium batteries as power is also rising linearly, and the demand for chargers for power lithium batteries is also rising. The voltage range of lithium batteries is wide, the voltage of each cell can be from 1V to 4.2V, and the voltage range of a 20-string battery pack can be from 20V to 84V. For such an ultra-wide range of output voltage, it is difficult for the current LLC circuit charger to meet its requirements, because the current circuit structure commonly used by the charger is a flyback circuit, and the output voltage can be realized by adjusting the duty cycle, although The output range can be made very wide, but the charging time is too long due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/10H02J7/00
CPCH02J7/06H02J7/007182
Inventor 杨海龙石贤德周明亮
Owner SHENZHEN CLICK TECH