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Electronic switch and electronic device using same

A technology of electronic switches and switching elements, applied in the direction of electronic switches, circuits, electrical components, etc., can solve the problems of large volume, overall enlargement of electronic switches, and large space occupation, and achieve the effect of low energy consumption and small volume

Active Publication Date: 2020-10-09
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of selecting a relay or a PMOS tube as a switch control module, as mentioned above, there are many disadvantages in terms of characteristics
However, if an NMOS tube is selected as the switch control module, since it requires an independent drive structure, when it is further combined with the inrush protection module A03 based on the temperature coefficient resistance, the overall size of the electronic switch will become larger and take up more space.
In addition, the use of the inrush protection module itself based on NTC devices requires space due to the large size of the NTC devices themselves, and the current always flows through the working process, especially in the steady state process, which will generate heat and generate redundant energy consumption, and the NTC device The reason for the higher cost is also not ideal

Method used

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  • Electronic switch and electronic device using same
  • Electronic switch and electronic device using same
  • Electronic switch and electronic device using same

Examples

Experimental program
Comparison scheme
Effect test

Deformed example 1

[0071] Figure 8 It is a circuit diagram showing a specific configuration of an electronic switch 201 according to Modification 1 of the present invention. The difference between the electronic switch 201 of this modification and the above-mentioned electronic switch 101 is that a third diode D3 is further connected in series between the third electronic switch Q3 and the negative input terminal IP-. Since the other configurations are the same as those of the electronic switch 101, the same configurations are indicated and corresponding descriptions are omitted.

[0072] According to the electronic switch 201 of Modification 1, the third diode D3 is further connected in series between the third electronic switch Q3 and the negative input terminal IP-, which can prevent the electron Switch 201 is damaged.

Deformed example 2

[0074] Figure 9 It is a circuit diagram showing a specific configuration of an electronic switch 301 according to Modification 2 of the present invention. The difference between the electronic switch 301 of this modification and the above-mentioned electronic switch 101 is that, between the first NMOS transistor Q1 and the positive output terminal A, a second NMOS transistor Q2 is further connected in reverse series. Since the other configurations are the same as those of the electronic switch 101, the same configurations are indicated and corresponding descriptions are omitted.

[0075] as it should Figure 9 As shown, the drains of the first NMOS transistor Q1 and the second NMOS transistor Q2 are connected to each other, forming a switch structure with input reverse connection protection. When the input is reversely connected, the conduction path will be blocked by the second NMOS transistor Q2, which can prevent the electronic switch 301 from being damaged due to revers...

Deformed example 3

[0077] Figure 10 It is a circuit diagram showing a specific configuration of an electronic switch 401 according to Modification 3 of the present invention. The electronic switch 401 of this modification differs from the above-mentioned electronic switch 101 in that a fourth switching element Q4 is further connected in series between the contact point of the third resistor R3 and the second capacitor C2 and the negative input terminal IP-. Since the other configurations are the same as those of the electronic switch 101, the same configurations are indicated and corresponding descriptions are omitted.

[0078] as it should Figure 10 As shown, by connecting the fourth switching element Q4 in series between the junction of the third resistor R3 and the second capacitor C2, and the negative input terminal IP-, the fourth switching element Q4 can be turned on and off by the control signal from the MCU. , so as to control the gate potential of the first NMOS transistor Q1. When...

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Abstract

The present invention provides an electronic switch comprising: a first NMOS transistor (Q1) connected between a positive electrode input terminal (IP +) and an output terminal (A), a first diode (D1), a second resistor (R2), a first capacitor (C1), and a third switching element (Q3) that are connected in series in sequence between a drain of the first NMOS transistor and a negative electrode input terminal (IP-), a first resistor (R1) connecting the contact of the first capacitor (C1) and the third switching element (Q3) at the positive electrode input terminal (IP +), a third resistor (R3) connected between the grid of the first NMOS transistor and a contact point between the second resistor (R2) and the first capacitor (C1), and a second capacitor (C2), a second diode (D2), and a fourthresistor (R4), which are connected in parallel between the contact of a third resistor (R3) and the grid of the first NMOS transistor and the source of the first NMOS transistor.

Description

technical field [0001] The invention relates to an electronic switch and electronic equipment using the electronic switch. Background technique [0002] With the continuous development of the electronic industry, more and more electronic devices need to use electronic switches. An electronic switch is an electronic device for turning on / off power supply from a power source. [0003] Figure 11A ~ Figure 11E is a diagram for explaining an example of the prior art. Figure 11A It shows an example of the application scene of the conventional electronic switch. exist Figure 11A In , the power module A01 obtains electric energy from the input terminal, and then converts it into the required output. A switch control module A02 is required at the input end, and an inrush (Inrush) protection module A03 is required. [0004] Figure 11B It is a schematic diagram of an example of a conventional scheme for realizing the switch control module A02 described above. In this solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/687
CPCH03K17/687H03K2217/0036H03K2217/0081H03K17/04123H03K17/08122H03K2217/0054H03K17/163
Inventor 宁龙李刚
Owner MURATA MFG CO LTD