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Signal output device

A signal output and signal generation technology, applied in signal transmission systems, transportation and packaging, instruments, etc., can solve problems such as unable to restore output, unable to ensure system stability, etc., to achieve the effect of ensuring stability and preventing adverse effects

Active Publication Date: 2020-07-17
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the output cannot be restored even in a short-term short-circuit to such an extent that the system side is not affected, so there is a problem that the stability of the system cannot be ensured.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0085] Figure 11 The signal generating circuit 601 of the first embodiment shown includes gate voltage regulators 71 and 72 for adjusting the gate voltages of the switching element SH on the upper line 31 and the switching element SL on the lower line 32 , respectively. When a short circuit is detected, the switching circuits 61 and 62 lower or raise the gate voltages of the switching elements SH and SL to switch the conduction capability of the signal generating circuit 601 to reduce the conduction current. In the Nmos transistor, the gate-source potential difference becomes smaller by lowering the gate voltage, and the conduction current is reduced. In the Pmos transistor, by raising the gate voltage, the gate-source potential difference becomes smaller, and the conduction current decreases.

no. 2 Embodiment approach

[0087] Figure 12 The signal generation circuit 602 of the second embodiment shown includes mirror elements MSH, MSL, and mirror elements MSH for connecting the gates of the switching element SH of the upper line 31 and the switching element SL of the lower line 32 to each other. , MSL-connected current regulators 71, 72. When a short circuit is detected, the switching circuits 61 and 62 reduce the conduction capacity of the signal generation circuit 602 by reducing the current amount of the current source serving as a reference of the switching elements SH and SL compared to the normal time, thereby reducing the conduction current. Small.

no. 3 Embodiment approach

[0089] Figure 13 In the signal generating circuit 603 of the third embodiment shown, two switching elements SH1 and SH2 are connected in parallel to the upper line 31 , and two switching elements SL1 and SL2 are connected in parallel to the lower line 32 . The gate of the switching element SH2 is connected to the control circuit 41 via a relay (relay) Ry2 , and the gate of the switching element SL2 is connected to the control circuit 42 via a relay Ry4 . Normally, relays Ry2 and Ry4 are connected, switching elements SH1 and SH2 and switching elements SL1 and SL2 are all turned on, and a large conducting current can be energized by parallel connection.

[0090] When a short circuit is detected, the switching circuits 61 and 62 turn off the relays Ry2 and Ry4 so that the switching elements SH2 and SL2 are no longer conductive. Therefore, only one switching element SH1 is turned on in the upper line 31 , and only one switching element SL1 is turned on in the lower line 32 , and...

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Abstract

In the present invention an output terminal (23) of a signal output device (20) is connected via a branch path (33) to a voltage division point (D) provided in the middle of main trunk paths (31, 32)connecting a power supply terminal (21) and a ground terminal (22), and transmits an output signal based on the voltage of the voltage division point (D) to the outside. A signal generation circuit (60) adjusts the voltage of the voltage division point (D) and generates the output signal. A short-circuit detection circuit (50) detects a short-circuit between the output terminal (23) and the otherterminals when a current flowing in the branch path (33) is greater than a prescribed short-circuit detection threshold value. When a short-circuit is detected by the short-circuit detection circuit (50) switching circuits (61, 62) switch the conduction capacity or the configuration of the signal generation circuit (60), thereby limiting the short-circuit current flowing in the branch path (33). The short-circuit current is set to a value equal to or greater than the short-circuit detection threshold value and less than an upper limit current value based on the supply capacity of a direct-current power supply.

Description

[0001] Cross-reference of connected application [0002] This application is based on Japanese Patent Application No. 2017-234417 filed on December 6, 2017, the contents of which are cited here. technical field [0003] The invention relates to a signal output device. Background technique [0004] Conventionally, a device having an output terminal for outputting a voltage signal is known. For example, the output circuit of the position detection device disclosed in Patent Document 1 generates a voltage signal obtained by dividing the voltage between the power terminal and the ground terminal based on the detection value of the sensor, and outputs the voltage signal from the output terminal to an external ECU. When an abnormal voltage is applied to the output terminal due to a short circuit between the terminals due to contact with water or metal foreign objects on the connector part, or contact between wire harnesses on the position detection device side, the output circuit...

Claims

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Application Information

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IPC IPC(8): G08C25/00B60R16/02
CPCG08C25/00B60R16/03G01R31/52G01R31/40
Inventor 伊藤卓祐河野祯之泷口智之
Owner DENSO CORP
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