CN211480904U

CN211480904U - Two-wire system capacitor handle safety circuit

Info

Publication number: CN211480904U
Application number: CN201922043591.1U
Authority: CN
Inventors: 王少菊; 华信磊; 曹卫娟
Original assignee: Shanghai Naen Automotive Technology Co ltd
Current assignee: Shanghai nan'en Automobile Technology Co.,Ltd.
Priority date: 2019-11-22
Filing date: 2019-11-22
Publication date: 2020-09-11
Anticipated expiration: 2029-11-22

Abstract

The utility model discloses a two-wire system electric capacity handle safety circuit, it mainly includes: a first connection terminal (IO1), a second connection terminal (IO2), a third connection terminal (IO3), a fourth connection terminal (IO5), and a fifth connection terminal (IO 6); a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a sixth capacitor (C6), a seventh capacitor (C7), an eighth capacitor (C8), and a ninth capacitor (C9); a first resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R8); a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), and a fifth diode (D5); a MOS transistor (Q1); the fourth resistor (R8) is designed between the MOS transistor (Q1) and the sixth capacitor (C6), so that short-circuit protection can be realized without adding any circuit element under the condition of ensuring the same function.

Description

Two-wire system capacitor handle safety circuit

Technical Field

The utility model relates to an electric capacity door handle technique, concretely relates to electric capacity door handle's safety technology.

Background

The capacitive switch is more and more popular because of energy saving, simpler assembly process, and more reliable precision and reliability compared with a mechanical switch. At present, the mainstream capacitive handle is a six-wire system, two are a power supply and a ground, two are locking and unlocking signal wires, and two are low-frequency signal wires; there are also four wire systems.

In the face of practical demands for cost reduction and improvement of integration convenience, various improved circuits have been proposed. For example, publication nos.: the CN 204595507U patent discloses a PSU and HSU compatible circuit for a keyless system controller, which can realize effective and convenient combination of a proximity sensor type door handle and a switch type door handle, and can realize two-wire system, thereby reducing the wiring cost and complexity of the whole vehicle. However, in the design of actual products, short-circuit experiments are required, and the power tube is directly burnt out by the circuit scheme.

SUMMERY OF THE UTILITY MODEL

In view of the problems of the existing two-wire capacitance handle solutions in terms of safety, a two-wire capacitance handle solution with higher safety is needed.

Therefore, an object of the present invention is to provide a two-wire capacitor handle safety circuit to overcome the problems of the prior art.

In order to achieve the above object, the utility model provides a two-wire system electric capacity handle safety circuit, include:

a first connection terminal (IO1), a second connection terminal (IO2), a third connection terminal (IO3), a fourth connection terminal (IO5), and a fifth connection terminal (IO 6);

a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a sixth capacitor (C6), a seventh capacitor (C7), an eighth capacitor (C8), and a ninth capacitor (C9);

a first resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R8);

a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), and a fifth diode (D5); a MOS transistor (Q1);

the first connection end (IO1) is used for being connected with a power supply VCC and a PEPS end and is connected with one end of a first capacitor (C1), the other end of the first capacitor (C1) is connected with one end of a second resistor (R2), and the other end of the second resistor (R2) is connected with the negative electrode of a first diode (D1), one end of a fourth capacitor (C4), the negative electrode of a fourth diode (D4) and a fourth connection end (IO 5); the fourth connection end (IO5) is used for connecting a handle positive end; the anode of the first diode (D1) is connected with one end of a third resistor (R3), the other end of the third resistor (R3) is connected with a power supply VCC, and one ends of a second capacitor (C2) and a third capacitor (C3) are connected; the other ends of the second capacitor (C2) and the third capacitor (C3) are grounded; the other end of the fourth capacitor (C4) is grounded; the anode of the fourth diode (D4) is connected with the anode of a fifth diode (D5), and the cathode of the fifth diode (D5) is grounded;

the second connection end (IO2) is used for being connected with a power supply VCC and a PEPS end and connected with one end of a ninth capacitor (C9), and the other end of the ninth capacitor (C9) is connected with one end of a fourth resistor (R8) and the D electrode of the MOS transistor (Q1); the other end of the fourth resistor (R8) is connected with one end of a sixth capacitor (C6), the cathode of a second diode (D2) and a fifth connection end (IO6), and the fifth connection end (IO6) is used for being connected with the negative end of the handle; the other end of the sixth capacitor (C6) is grounded; the anode of the second diode (D2) is connected with the anode of the third diode (D3), and the cathode of the third diode (D3) is grounded;

the S pole of the MOS tube (Q1) is grounded; the G pole of the MOS transistor (Q1) is grounded through a first resistor (R1) and is grounded through a seventh capacitor (C7) and an eighth capacitor (C8) which are connected in parallel; the G pole of the MOS transistor (Q1) is also connected to a third connection terminal (IO 3); the third connection terminal (IO3) is used for connecting a power supply VCC to a PEPS terminal.

Further, the second diode (D2), the third diode (D3), the fourth diode (D4) and the fifth diode (D5) are voltage regulators.

The utility model provides a scheme can realize the short-circuit protection to two wire system electric capacity handle circuit through reasonable circuit design, improves two wire system electric capacity handle circuit security, can effectively pass through the short circuit experiment.

The utility model provides a scheme is specifically with fourth resistance (R8) design of circuit negative terminal adjustment frequency and electric current size between MOS pipe (Q1) and sixth electric capacity (C6), can guarantee under the condition of the same function from this, does not have to increase any circuit element and just can realize short-circuit protection.

Drawings

The invention is further described with reference to the following drawings and detailed description.

FIG. 1 is a schematic diagram of a safety circuit in this example;

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

Referring to fig. 1, a schematic diagram of the two-wire capacitor handle safety circuit of the present example is shown.

As can be seen from the figure, the two-wire capacitor handle security circuit mainly comprises a first connection terminal (IO1), a second connection terminal (IO2), a third connection terminal (IO3), a fourth connection terminal (IO5) and a fifth connection terminal (IO 6); a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a sixth capacitor (C6), a seventh capacitor (C7), an eighth capacitor (C8), and a ninth capacitor (C9); a first resistor (R1), a second resistor (R2), a third resistor (R3), and a fourth resistor (R8); a first diode (D1), a second diode (D2), a third diode (D3), a fourth diode (D4), and a fifth diode (D5); a MOS transistor (Q1); these elements are formed in cooperation with each other.

Here, the first diode (D1) is a conventional diode, and the second diode (D2), the third diode (D3), the fourth diode (D4), and the fifth diode (D5) are voltage regulators.

The fourth resistor (R8) is used as a regulating resistor for regulating the frequency and the current magnitude at the negative terminal of the whole circuit.

Specifically, the first connection terminal (IO1) is used for connecting a power supply VCC to a PEPS terminal and connecting one end of a first capacitor (C1), the other end of the first capacitor (C1) is connected with one end of a second resistor (R2), and the other end of the second resistor (R2) is connected with a cathode of a first diode (D1), one end of a fourth capacitor (C4), a cathode of a fourth diode (D4) and a fourth connection terminal (IO 5); the fourth connection end (IO5) is used for connecting the handle positive end; the anode of the first diode (D1) is connected with one end of a third resistor (R3), the other end of the third resistor (R3) is connected with a power supply VCC, and one ends of a second capacitor (C2) and a third capacitor (C3) are connected; the other ends of the second capacitor (C2) and the third capacitor (C3) are grounded; the other end of the fourth capacitor (C4) is grounded; the anode of the fourth diode (D4) is connected to the anode of the fifth diode (D5), and the cathode of the fifth diode (D5) is grounded.

The second connecting end (IO2) is used for connecting a power supply VCC to a PEPS end and connecting one end of a ninth capacitor (C9), and the other end of the ninth capacitor (C9) is connected with one end of a fourth resistor (R8) and the D electrode of a MOS transistor (Q1); the other end of the fourth resistor (R8) is connected with one end of a sixth capacitor (C6), the cathode of a second diode (D2) and a fifth connection end (IO6), and the fifth connection end (IO6) is used for being connected with the negative end of the handle; the other end of the sixth capacitor (C6) is grounded; the anode of the second diode (D2) is connected with the anode of the third diode (D3), and the cathode of the third diode (D3) is grounded.

The S pole of the MOS tube (Q1) is grounded; the G pole of the MOS transistor (Q1) is grounded through a first resistor (R1) and is grounded through a seventh capacitor (C7) and an eighth capacitor (C8) which are connected in parallel; the G pole of the MOS transistor (Q1) is also connected to a third connection terminal (IO 3); and the third connection terminal (IO3) is used for connecting the power supply VCC to the PEPS terminal.

In the two-wire capacitance handle safety circuit, the fourth connection end (IO5) is connected with the positive end of the handle, the fifth connection end (IO6) is connected with the negative end of the handle, and the two wires are used as a power line of the handle, a locking and unlocking signal line and a low-frequency signal line.

The first connection end (IO1), the second connection end (IO2) and the third connection end (IO3) are connected with the PEPS end through the power supply VCC.

Thus, when the handle is operating normally, the low frequency signal is not excited. At the moment, the power supply VCC supplies power, the first capacitor (C1) and the ninth capacitor (C9) are isolated from direct current, and current flows from VCC to the ground through the handle and the MOS tube (Q1).

When the signal line is used as a locking and unlocking signal line, the PEPS terminal judges whether the signal line is locked, unlocked or not by detecting the PWM wave duty ratio formed by voltage jump of the handle terminal. When the low-frequency working is carried out, the control end of the third connecting end (IO3) turns off the MOS tube (Q1), and signals return to the second connecting end (IO2) from the first connecting end (IO1) through the handle.

Furthermore, the first capacitor (C1) and the ninth capacitor (C9), the second resistor (R2) and the fourth resistor (R8) cooperate with each other to adjust the frequency and the energy intensity. The fourth resistor (R8) plays a significant role in adjusting the amplitude of the output signal of the handle and protecting the short circuit.

Therefore, the fourth resistor (R8) for adjusting the frequency and the current of the negative end of the circuit is designed between the MOS transistor (Q1) and the sixth capacitor (C6), so that short-circuit protection can be realized without adding any circuit element under the condition of ensuring the same function.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A two-wire capacitive handle security circuit, comprising:

2. The two-wire capacitor handle safety circuit of claim 1, wherein the second diode (D2), the third diode (D3), the fourth diode (D4), and the fifth diode (D5) are voltage regulators.