Controllable power supply circuit for automobile instruments
A technology of power supply circuit and automobile instrument, which is applied in the field of power supply protection circuit and power supply circuit of automobile instrument, which can solve the problems of unable to adjust the power supply voltage and damage of automobile instrument, and achieve the effect of improving the power supply effect
Inactive Publication Date: 2016-05-18
JIANGSU XINTONGDA ELECTRONICS SCI & TECHCO
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is that the existing automotive instrument power supply circuit will cause damage to the automotive instrument when overvoltage, and cannot effectively adjust the power supply voltage according to actual needs
Method used
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[0013] Such as Figure 1-3 As shown, the automotive meter controllable power supply circuit of the present invention includes a sampling voltage divider circuit, a single-chip microcomputer, a digital voltage divider circuit and a voltage stabilizing circuit; The voltage divider output end of the circuit is connected to the A / D sampling pin of the single-chip microcomputer; the digital voltage divider circuit includes a voltage divider resistor R3 and a digital potentiometer, one end of the voltage divider resistor R3 is used to connect with the power supply end of the input power supply, and the voltage divider resistor The other end of R3 is connected to the sliding end pin of the digital potentiometer, the low-voltage end pin of the digital potentiometer is grounded, the control end of the digital potentiometer is connected to the I / O pin of the microcontroller; the input end of the voltage stabilizing circuit is connected to the branch The connection between the piezoresis...
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The invention provides a controllable power supply circuit for automobile instruments, comprising a sampling voltage dividing circuit, a single-chip microcomputer, a digital voltage dividing circuit, and a voltage stabilizing circuit. The input end of the sampling voltage dividing circuit is used for being connected with the power end of an input power supply, and the voltage dividing output end of the sampling voltage dividing circuit is connected with an A / D sampling pin of the single-chip microcomputer. The digital voltage dividing circuit comprises a voltage dividing resistor R3 and a digital potentiometer, wherein one end of the voltage dividing resistor is used for being connected with the power end of the input power supply, the other end of the voltage dividing resistor is connected with the sliding end pin of the digital potentiometer, the low-voltage end pin of the digital potentiometer is connected with ground, and the control end of the digital potentiometer is connected with an I / O pin of the single-chip microcomputer. The input end of the voltage stabilizing circuit is connected to the joint of the voltage dividing resistor and the sliding end pin of the digital potentiometer. The voltage stabilizing output end of the voltage stabilizing circuit is used for being connected with the power input end of an instrument circuit. According to the controllable power supply circuit for automobile instruments, the input voltage of the voltage stabilizing circuit can be changed in real time, and the instrument circuit is protected effectively.
Description
technical field [0001] The invention relates to a power supply protection circuit, in particular to a power supply circuit for an automobile instrument, belonging to the field of automobile electronics. Background technique [0002] When supplying power to the automotive instrument circuit, due to the poor contact of the battery power supply terminal and the high high voltage generated when the high-power inductive load is working, in order to solve the problem of damage to the circuit module connected to the power supply when the high voltage interference at the power supply terminal, it is necessary to A protection circuit is used at the input end of the power supply to control the output amplitude of the power supply within a certain range. [0003] At present, the existing technical solution is to add a TVS device at the power input end, absorb the voltage higher than the TVS limit value, and protect the back-end power supply circuit, but the disadvantage of this technic...
Claims
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Inventor 吴肖峰顾丽军魏振华戴从枚陈国
Owner JIANGSU XINTONGDA ELECTRONICS SCI & TECHCO