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Load driving device

A technology of load driving and primary winding, which is applied in the direction of output power conversion device, transportation and packaging, high-efficiency power electronic conversion, etc., and can solve the problem of increased switching loss and other issues

Pending Publication Date: 2021-07-23
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such a flyback converter is a separate excitation type with a constant switching frequency, if it is turned on (turned on) in a state where the voltage between the drain and the source is relatively high during resonance, the switching loss will increase significantly. Big

Method used

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no. 1 Embodiment approach

[0023] A first embodiment of the load driving device of the present invention will be described.

[0024] figure 1 A vehicle shock absorber system as an application example of a load driving device is shown. The vehicle damper system includes, for example, damping force variable dampers 3 on the wheels 2 a to 2 d in order to attenuate vibrations caused by unevenness of the road surface during running in the four-wheeled vehicle 1 . The variable damping force damper 3 is configured by enclosing an electroviscous fluid whose viscosity changes according to an applied voltage (for example, a high voltage of several thousand volts at most, such as 5 kV) as a working fluid, and transmitting By controlling the applied voltage, the level of damping force can be adjusted. The damping force variable damper 3 constitutes a suspension device for each of the wheels 2 a to 2 d together with suspension springs (not shown).

[0025] In addition, as an example of the vehicle body behavior i...

no. 2 Embodiment approach

[0068] Next, a second embodiment of the load driving device of the present invention will be described. In addition, in the second embodiment, it is assumed that the load driving device is a high-voltage supply device applied to the same vehicle shock absorber system as that of the first embodiment, and the same reference numerals are assigned to the same structures as those of the first embodiment. , omit or simplify its description.

[0069] Figure 6 An example of a high voltage supply device in a vehicle shock absorber system is shown. The high voltage supply device 5 a in the vehicle shock absorber system includes a booster circuit 51 , a control IC 52 , and a conduction timing detection circuit 53 a as a flyback converter.

[0070] The conduction timing detection circuit 53 a includes a second switching element 534 instead of the second diode 531 . The second switching element 534 has a gate threshold voltage V th It is an N-channel MOSFET and is a semiconductor swit...

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Abstract

This load driving device comprises a flyback converter which includes: a transformer which has a primary winding connected to a power supply and a secondary winding connected to a load; and a switch element which is disposed in a ground side of the primary winding and controls an application voltage to the primary winding. In addition, the present invention generates a voltage (Vc) to be compared that is smaller than a voltage Vds between the primary winding and the switch element, and changes a driving signal Vgs for the switch element to put the switch element in an On state from an Off state, when the voltage Vc to be compared is dropped to a prescribed voltage (ground potential) (at time tc).

Description

technical field [0001] The present invention relates to a load drive device including a flyback converter. Background technique [0002] It is known that in the flyback converter, during the current discontinuous mode operation, when the switching element on the primary side is off and the current of the rectifying diode on the secondary side is zero, the magnetizing inductance of the transformer and the Resonance due to parasitic capacitance of switching elements, etc. When such a flyback converter is a separate excitation type with a constant switching frequency, if it is turned on (turned on) in a state where the voltage between the drain and the source is relatively high during resonance, the switching loss will increase significantly. Big. Therefore, in order to reduce the switching loss in resonance, for example, as described in Patent Document 1, there is known a technique of turning on the switching element at the timing when the drain-source voltage becomes the mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28
CPCH02M3/33523H02M1/0054H02M1/0058Y02B70/10B60G17/015H02M3/33507
Inventor 黑岩伸幸
Owner HITACHI ASTEMO LTD
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