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Method for controlling flash lamp capacity charging and its apparatus and application thereof

A capacitor charging and control device technology, applied in the field of flash capacitor charging control and flash capacitor charging, can solve problems such as unfavorable design of flash and camera systems

Inactive Publication Date: 2007-11-28
YUBANG SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reference voltages VREF1133 and VREF2 138 have been determined when the integrated circuit is produced, so there is no way to change the charging current limit
This is bad for flash and camera system design

Method used

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  • Method for controlling flash lamp capacity charging and its apparatus and application thereof
  • Method for controlling flash lamp capacity charging and its apparatus and application thereof
  • Method for controlling flash lamp capacity charging and its apparatus and application thereof

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Embodiment Construction

[0032] The present invention will be easier to fully understand through the accompanying drawings attached to the detailed description, which are only for illustration purposes and do not limit the present invention to the scope shown in the drawings.

[0033]FIG. 2A is a circuit block diagram of a flashlight capacitor charging device produced according to one of the implementation methods of the present invention. The flashlight capacitor charging device is connected with a microprocessor (not shown in the figure) in the camera to function, and it includes: a capacitor C1, a voltage step-up transformer 21, an integrated circuit 22, and an ultra-fast (ultra-fast) diode D1 , a flash capacitor 23, a voltage divider 24 and a variable resistor 25. The voltage step-up transformer 21 uses one end of the primary side winding to receive the primary side input voltage from the input source 20, and the other end of the primary side winding is connected to the SWITCH pin of the integrate...

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PUM

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Abstract

This invention relates to a control method for charging flashlight capacitors, its device and its application, in which, the method includes: generating an input current when generating a start signal to induce a current charging the flashlight capacitor, detecting a first voltage expressing the voltage of the capacitor and a second voltage of the corresponding input current and controlling the start and cancel of a recharge signal by the state that the measured said first voltage is lower or higher than a first reference voltage, controlling the start and cancel of a current limit signal by the state that the measured said second voltage is higher or lower than a second reference voltage, in which, only the recharge signal is started and the current limit signal is canceled, the above mentioned start up signal is sent out, a foot bit is provided to connect a resistor element determining the second reference voltage.

Description

technical field [0001] The present invention relates to a flashlight circuit, in particular to a flashlight capacitance charging control method and device and its application, in particular to a control method and device for charging the flashlight capacitance with an adjustable charging current limit and its application. Background technique [0002] Cameras utilizing a flash generally include a charging circuit for charging a flash capacitor attached to the camera. The flash capacitor stores energy in the form of charge. This energy is later used by the flash to create a flash when the photo is taken. [0003] Generally speaking, in a camera with a charging circuit, there will be a battery to provide a certain level of voltage to a voltage step-up transformer (Step uptransformer) as part of the charging circuit. The transformer converts a voltage of about 3 volts (battery voltage) to 300 volts for charging a flash capacitor, which in turn supplies the energy stored in it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J15/00H05B37/02
Inventor 虞造林
Owner YUBANG SCI & TECH