Output current pumping circuit and remote controller using the same

A technology of remote controller and power supply voltage, which is applied in the direction of control/adjustment system, user/computer interaction input/output, instrument, etc., which can solve problems such as wrong keys and achieve the effect of preventing errors

Inactive Publication Date: 2008-10-22
LG ELECTRONICS INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that since the resistance of the existing pull-up resistor is close to the resistance of the off resistor of the key in the key matrix, the input port An is read as low state, so that the IC will mistakenly think that the button is turned on

Method used

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  • Output current pumping circuit and remote controller using the same
  • Output current pumping circuit and remote controller using the same
  • Output current pumping circuit and remote controller using the same

Examples

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Embodiment Construction

[0069] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings

[0070] 4 is a diagram showing a remote controller according to an embodiment of the present invention;

[0071] As shown in the figure, the remote controller of the present invention includes a button matrix 370, wherein a plurality of output ports and input ports of the remote control IC are combined into a matrix-structured button, and a port control unit 330 is used to sequentially control the output port B1 -Bm, in order to find one or more pressed keys from the key matrix, key input port unit 340, which has a pull-up resistor embedded therein and reads the input state of each key through a buffer A1- An, the transmission signal generation unit 330 is used to generate a predetermined transmission signal for combining the input and output ports corresponding to the pressed key, and the control unit 320 is used to detect the voltage of ...

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PUM

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Abstract

The present invention relates to a remote control IC having a circuit for pumping up current of an output port and a remote controller implemented to be capable of operating with one battery of about 1.5V using the IC. In the remote controller, an infrared LED emits light through the remote control IC, so that signals are transmitted to devices to be controlled such as a television set.; In order to perform all functions normally even at low voltage and particularly to secure a sufficient transmission distance by driving the infrared LED, the present invention implements a remote controller comprising a remote control IC having a circuit for pumping up output current of an output port, which needs high output current, even at low voltage, and a battery of about 1.5V for driving the remote controller, wherein the infrared LED is driven by the pumped up output current of the output port of the remote control IC, whereby the remote controller can maintain a sufficient transmission distance with only one battery of about 1.5V.; The output port according to the present invention has an output current pumping circuit for detecting a level of power voltage according to the drop of the power voltage, boosting the power voltage, and supplying a voltage boosted higher than the power voltage to the gate of a MOS transistor to obtain output current of high voltage. The output current pumping circuit comprises a power voltage detection unit for determining a level of the power voltage, a boost circuit unit for boosting the power voltage depending on an effective signal of the power voltage detection unit, and a data conversion unit for receiving the changed (boosted) power voltage and controlling the changed (boosted) power voltage in response to a transmission signal to supply gate voltage of the MOS transistor for outputting final current.

Description

technical field [0001] The present invention relates to a circuit for pumping current from an output port and a remote controller having the circuit, and in particular, to an output current pumping circuit, wherein the output port of the present invention detects a voltage related to a power supply drop the level of the supply voltage, and boost and supply this voltage to obtain high voltage output current. Background technique [0002] Generally, if one or more keys are input through the keypad of the matrix structure in the remote controller, the output port of the key matrix is ​​sequentially turned into a low state one by one by the port control unit, and the The key input port of the structure of the pull-up resistor to read each key input. If a low input is read, a transmission signal of a predetermined format is generated at the associated output and input ports, and the driver is embedded in the figure 1 The output n-channel MOSFET (NMOS) transistor 100 in the show...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08C23/04G05F1/10
CPCG06F3/02H03K17/12H03K17/223
Inventor 徐浚浩李正禹
Owner LG ELECTRONICS INC
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