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DC-DC converter

A technology of DC converter and DC input, which is applied in the direction of converting DC power input into DC power output, instruments, and adjusting electric variables, etc., to achieve the effect of fire prevention

Inactive Publication Date: 2016-07-27
SMK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While the switching transistor Tr1 is controlled to be closed (controlled to be turned on) to operate in a saturated state, current flows from the DC input power supply 30 to the inductor L1 to charge the capacitor C1. However, the charge of the capacitor C1 that becomes the output voltage Vo The voltage becomes lower than the input voltage Vi due to the self-inductance of the inductor L1

Method used

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Examples

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Embodiment Construction

[0046] A DC-DC converter according to an embodiment of the present invention is a step-down DC-DC converter 1 that converts a DC input voltage Vi of 12V into a DC output voltage Vo of 5V. Hereinafter, Figure 1 to Figure 4 This step-down DC-DC converter 1 will be described. figure 1 is the circuit diagram of step-down DC-DC converter 1, through the Figure 7 Compared with the DC-DC converter 100 shown in the prior art, it is clear that the DC-DC converter 1 does not change the basic structure of the DC-DC converter 100, and it adds a protection circuit 2 and is connected to the high-voltage side power terminal 30a and the switching transistor Tr2 serving as an emergency stop switch between the switching transistor Tr1. Therefore, the main circuit structure is the same as the step-down DC-DC converter 100 of the prior art described above, therefore, the same reference numerals are assigned to the structures that are substantially the same or have the same function, and their d...

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Abstract

A DC-DC converter is provided. A comparison is made between the voltage (Vd) of the connection point (A) at the connection of a switching transistor with an inductor, and the threshold voltage (Vth) that is set within the range of fluctuation of the voltage (Vd) of the connection point (A) during the switching operation of the switching transistor. When the polarity obtained by comparing the voltage (Vd) and the threshold voltage (Vth) does not vary during a detection period (Td) that is longer than a prescribed period of a drive circuit, it is determined that the switching transistor is operating in an active state in which there is risk of heating.

Description

technical field [0001] The present invention relates to a DC-DC converter that converts a DC voltage into a stable DC voltage suitable for a load. DC-DC converters with different DC output voltages. Background technique [0002] A DC-DC converter is a device that converts a DC input voltage into a different DC output voltage and outputs it to a load. It is installed in each electronic circuit that operates with a different DC voltage in various electronic products such as notebook computers. , Convert the input voltage to the stable DC voltage required by the electronic circuit and output it. DC-DC converters can be divided into isolated DC-DC converters based on their operating principles, which use a transformer to increase or decrease the input voltage, and switch transistors to intermittently convert the current flowing in the inductor to a voltage different from the DC input voltage. voltage or polarity of the DC output voltage of the non-isolated DC-DC converter, how...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02H7/12
CPCH02H7/1213H02M1/32H02M3/156H02M1/327H02M1/08
Inventor 饴井俊裕
Owner SMK CO LTD
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