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Voltage reducing circuit and electronic product

A technology of step-down circuit and voltage divider circuit, which is applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve the problems that affect the market competitiveness of electronic products, LDO cannot provide large current, and the cost of electronic products increases, so as to improve the market Competitiveness, low circuit cost, effect of hardware cost reduction

Inactive Publication Date: 2015-04-01
QINGDAO GOERTEK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commonly used step-down chip is LDO (Low Dropout Regulator), but the general LDO cannot provide large current, and the cost of LDO that can provide large current is relatively high, which leads to an increase in the cost of electronic products that require high current, which affects the quality of electronic products. Market Competitiveness

Method used

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  • Voltage reducing circuit and electronic product
  • Voltage reducing circuit and electronic product

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Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1. The step-down circuit of this embodiment is mainly composed of an LDO chip and a PNP transistor Q1, etc., see figure 1 As shown, the LDO includes a voltage input pin VIN, a voltage output pin VOUT, an enable pin EN, a ground pin GND, an adjustment pin ADJ, etc. The DC power supply U is connected to the voltage input pin VIN of the LDO through a current limiting resistor R3 , the collector of the PNP transistor Q1 is connected to the voltage output pin VOUT of the LDO, the emitter of the PNP transistor Q1 is connected to the DC power supply U, and the base of the PNP transistor Q1 is connected to the voltage input pin VIN; that is, the PNP transistor Q1 The emitter of Q1 is connected to one end of the current limiting resistor R3, and the base is connected to the other end of the current limiting resistor R3. The ground pin GND of the LDO is grounded, the enable pin EN is active at a high level, and is connected to the DC power supply U.

[0022] In this e...

Embodiment 2

[0029] Embodiment 2. The step-down circuit of this embodiment is mainly composed of LDO chip and PMOS transistor Q1, etc., see figure 2 As shown, the LDO includes a voltage input pin VIN, a voltage output pin VOUT, an enable pin EN, a ground pin GND, an adjustment pin ADJ, etc. The DC power supply U is connected to the voltage input pin VIN of the LDO through a current limiting resistor R3 , the drain of the PMOS transistor Q1 is connected to the voltage output pin VOUT of the LDO, the source of the PMOS transistor Q1 is connected to the DC power supply U, and the gate of the PMOS transistor Q1 is connected to the voltage input pin VIN; that is, the source of the PMOS transistor Q1 Connect one end of the current limiting resistor R3, and connect the gate to the other end of the current limiting resistor. The ground pin GND of the LDO is grounded, the enable pin EN is active at a high level, and is connected to the DC power supply U.

[0030] In this embodiment, the voltage o...

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Abstract

The invention discloses a voltage reducing circuit. The voltage reducing circuit comprises an LDO (low dropout regulator) and a PNP type triode, wherein a voltage input pin of the LDO is connected with a direct current power supply through a current-limiting resistor, a collector of the PNP type triode is connected with a voltage output pin of the LDO, an emitter of the PNP type triode is connected with the direct current power supply, and a base of the PNP type triode is connected with the voltage input pin of the LDO. According to the voltage reducing circuit, the PNP type triode / a PMOS (P-channel metal oxide semiconductor) transistor is matched with the LDO, the voltage provided by the direct current power supply is reduced, the required voltage is provided for a power consumption load, the required large current can also be provided for the power consumption load, and the circuit is lower in cost; the voltage reducing circuit is applied to an electronic product, the power consumption requirement of the electronic product is met, the hardware cost of the electronic product is reduced, and the market competitiveness of the electronic product is improved.

Description

technical field [0001] The invention belongs to the technical field of circuits, and in particular relates to a step-down circuit and electronic products designed using the step-down circuit. Background technique [0002] At present, electronic products such as mobile phones, wireless fixed phones, and set-top boxes are powered by a DC power supply. Since the voltage of the DC power supply is higher than the actual required voltage, a step-down process is generally required. [0003] The commonly used step-down chip is LDO (Low Dropout Regulator), but the general LDO cannot provide large current, and the cost of LDO that can provide large current is relatively high, which leads to an increase in the cost of electronic products that require high current, which affects the quality of electronic products. Market Competitiveness. Contents of the invention [0004] The invention provides a step-down circuit, which can not only provide large current for electric loads, but als...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 杜洋
Owner QINGDAO GOERTEK