Protection circuit of excitation power supply of weighing sensor
A technology of weighing sensor and excitation power supply, applied in the field of circuits, can solve problems such as burnout and short circuit of excitation power supply, and achieve the effect of reliable protection, avoidance of instrument damage and system stability.
Active Publication Date: 2011-02-23
SHANGHAI YAOHUA WEIGHING SYST
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Problems solved by technology
ADI company gives the reference circuit of AC excitation, such as figure 1 As shown, the disadvantage of this circuit is that when the sensor is connected incorrectly or the excitation power supply is short-circuited due to other accidents, several field effect transistors Q3~Q6 will burn out in an instant
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[0009] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0010] figure 2 A protection circuit for a load cell excitation power supply, including an analog-to-digital conversion circuit 2, the output end of the load cell 1 is connected to the analog input end of the analog-to-digital conversion circuit 2, the digital output end of the analog-to-digital conversion circuit 2 and Other ports connected with the single-chip microcomputer are all connected with the single-chip microcomputer interface circuit 7, the input end of the load cell 1 is connected with the first output end of the AC excitation circuit 3, and the output end of the analog-to-digital conversion circuit 2 is connected with the first output end of the AC excitation drive circuit 4. The input end connection is characterized in that the input end of the AC excitation circuit 3 is connected with the output end of the AC excitation drive circuit ...
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The invention discloses a protection circuit of an excitation power supply of a weighing sensor. The protection circuit is characterized in that an input terminal of an alternating current exciting circuit is connected with an output terminal of an alternating current excitation driving circuit, a first input terminal of the alternating current excitation driving circuit is connected with the protection circuit, a second input terminal of the alternating current excitation driving circuit is connected with an output terminal of an overcurrent protection circuit, a first input terminal of the overcurrent protection circuit is connected with an output terminal of a restart circuit, an input terminal of the restart circuit is connected with an input terminal of a monolithic processor circuitinterface, and a second input terminal of the overcurrent protection circuit is connected with the second output terminal of the alternating current exciting circuit. The invention realizes the reliable protection of the alternating current excitation power supply of the sensor and avoids the instrument damage due to the external fault; and the restart circuit provides the possibility that the system automatically restores to work under the condition of instantaneous failure of the external circuit so that the system is more stable.
Description
technical field [0001] The invention relates to the field of circuits, in particular to a protection circuit for an excitation power supply of a weighing sensor. Background technique [0002] The analog-to-digital conversion part of the weighing indicator adopts the AD7730 integrated circuit of ADI Company, which can drive the weighing sensor with an AC excitation power supply. ADI company gives the reference circuit of AC excitation, such as figure 1 As shown, the disadvantage of this circuit is that when the sensor is connected incorrectly or the excitation power supply is short-circuited due to other accidents, several field effect transistors Q3~Q6 will burn out in an instant. Contents of the invention [0003] The purpose of the present invention is to provide a reliable and stable protection circuit for the excitation power supply of the load cell. [0004] In order to achieve the above object, the technical solution of the present invention is as follows: a protec...
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IPC IPC(8): G01G23/18H02H3/08
Inventor 徐平均
Owner SHANGHAI YAOHUA WEIGHING SYST