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Current Driver Circuit

A current driver and circuit technology, applied in circuits, instruments, electronic switches, etc., can solve the problems of output current waveform slew rate degradation and circuit area increase.

Active Publication Date: 2018-08-07
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When the technique in JP-3868836 B2 is applied, since a current amplifier is necessary after the output of the D / A converter, the circuit area increases
Furthermore, if the circuit topology shown in JP-3868836 B2 is applied in combination with a current amplifier provided by MOS transistors, the slew rate of the output current waveform is degraded since the response of the output current change cannot accompany the rapid input current change

Method used

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Examples

Experimental program
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no. 1 example

[0022] Such as Figure 2A As shown in , a master-slave system 1 for a vehicle includes an ECU (ie, electronic control unit) 2 as a master and a sensor device 3 as a slave. Communication is performed between the ECU 2 and the sensor device 3 . The sensor device 3 comprises a control circuit 4 , a transmitter 5 as a current driver circuit, a receiver 6 and a memory 7 . The ECU 2 has a configuration similar to that of the sensor device 3 . Specifically, the ECU 2 includes a control circuit, a transmitter, a receiver, a memory, and the like.

[0023] The ECU 2 is connected to the sensor device 3 through a transmission line 8 . The ECU 2 sends commands to the sensor device 3 by changing the voltage level of the transmission line 8 . When the sensor device 3 responds to a command sent from the ECU 2 , the sensor device 3 changes the level of current flowing in the transmission line 8 so that the sensor device 3 responds to the ECU 2 . For example, when considering the DSI3 stan...

no. 2 example

[0060] will refer to Figure 10 to Figure 1 2 to describe the second embodiment. In the second embodiment, the delay unit 14 includes a digital delay circuit 214 instead of the analog delay circuit 114 .

[0061] The delay unit 14 according to this embodiment includes as Figure 10 The digital delay circuit 214 is shown in . One of the output-side transistors 16 (for example, Figure 10 Transistor 16a) shown in . Each transistor cell 116a-116e is provided by an N-channel MOSFET. The sources of the plurality of transistor units 116a-116e are respectively connected to switching units 117a-117e (which correspond to switching circuits) as the switch 17. Each switching unit 117a-117e is provided by an N-channel MOSFET.

[0062] A control terminal (ie, a gate) of each switching unit 117 a - 117 e is connected to a digital delay circuit 214 as the delay unit 14 . Digital delay circuit 214 includes a plurality of delay elements 214a-214e (eg, forward buffers) connected to each ...

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PUM

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Abstract

A current driver circuit, comprising: a current conversion unit (13), the current conversion unit (13) comprising an input-side transistor (15) and a plurality of output-side transistors (16), and a reference current is input into the input-side transistor , the plurality of output side transistors output an output current corresponding to a reference current, and the current conversion unit has a digital-to-analog conversion function and a current amplification function, and the digital-to-analog conversion function is used to convert a digital control signal into an analog signal , the current amplification function is used to amplify the reference current according to the amplification ratio corresponding to the digital control signal; and an adjustment unit (50), the adjustment unit adjusts the digital control signal to be input to the output side transistor. When the adjustment unit adjusts the digital control signal, the current conversion unit changes the amplification ratio to gradually increase or decrease the output current, and controls the conversion rate of the output current within a predetermined range.

Description

technical field [0001] The present disclosure relates to current driver circuits for outputting current. Background technique [0002] In general, digitally controlled current driver circuits are presented that can vary the magnitude of the output current by varying a digital signal. For example, JP-3868836 B2 shows such a current driver circuit. A circuit topology with a D / A converter and a current amplifier is disclosed in JP-3868836 B2. D / A converters are built from bipolar or MOS transistors. The current amplifier amplifies the current from the output of the D / A converter. Current driver circuits are used in circuits for LED driving, organic EL driving, or communication. [0003] When the technique in JP-3868836 B2 is applied, since a current amplifier is necessary after the output terminal of the D / A converter, the circuit area increases. Furthermore, if the circuit topology shown in JP-3868836 B2 is applied in combination with a current amplifier provided by MOS t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F3/26
CPCH03K17/04123H03K17/122
Inventor 稻津贤治
Owner DENSO CORP