Power supply circuit of Hall open-loop current transducer
A technology of power supply circuit and transmitter, which is applied in the direction of adjusting electric variables, converting DC power input to DC power output, and instruments. It can solve the problems of large current consumption, low precision, and burnt power chips, etc., and achieve low cost. , stable work and high adaptability
Inactive Publication Date: 2015-04-01
NINGBO CRRC TIMES TRANSDUCER TECH CO LTD
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Problems solved by technology
[0003] (1) The power supply voltage adopts a single power conversion chip. Since the circuit is a current output, the current consumption is relatively large, and poor heat dissipation of the power chip will cause
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[0012] The present invention will be further described below in conjunction with the embodiments of the accompanying drawings.
[0013] Such as figure 1 As shown, the external power supply VCC is connected to one end of the inductor L1, the opposite power supply ground GND is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to 0V. The other end of the inductor L1 is connected to the diode VD1, the diode VD1 is connected to the input terminal IN of the linear voltage regulator NR1, the TVS tube VS1 is connected between the diode VD1 and the linear voltage regulator NR1, and the high and low frequency filter capacitors C1 and C2 are respectively connected to 0V. Assume that the potential on the connection line between diode VD1 and NR1 is VCC1, VCC1 is connected to resistor R2 and resistor R4 respectively, resistor R2 and resistor R4 are connected in parallel and connected to the collectors of transistors VT2 and VT3, and the bases of VT...
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The invention discloses a power supply circuit of a Hall open-loop current transducer. The external power supply range is 20-50 Vdc. The power supply circuit comprises an EMC part, a voltage conversion part, a power consumption sharing part, a secondary power supply conversion part and a tertiary power supply conversion part, wherein the EMC part is characterized in that an external power supply, an grounded end, an inductor, a TVS tube and a capacitor form a surge-resistant and pulse-packet-interference-resistant circuit; the voltage conversion part is characterized in that a linear voltage stabilizer is used for converting the voltage VCC1 to 15-Vdc voltage reference required for a signal processing circuit; the power consumption sharing part is characterized in that two high-power transistors share current required by the signal processing circuit; collector electrodes of the transistors are connected with the voltage VCC1 by virtue of a voltage dividing resistor; an emitting pole is connected with a resistor and is used for reducing the voltage so as to guide and connect all the transistors; the secondary power supply conversion part is characterized in that the resistor is connected with the other linear voltage stabilizer and is used for converting voltage VCC3 to 5Vdc; the tertiary power supply conversion part is characterized in that 5Vdc is connected with a low-power polarity inversion power supply converter and is used for converting 5Vdc to -5Vdc.
Description
technical field [0001] The invention relates to a Hall open-loop current transmitter. Background technique [0002] The Hall open-loop current transmitter commonly used in industry and track fields has the following disadvantages in the power supply circuit: [0003] (1) The power supply voltage adopts a single power conversion chip. Since the circuit is a current output, the current consumption is relatively large, and poor heat dissipation of the power chip will cause instability and burn the power chip; [0004] (2) A diode gating circuit is used to realize the positive and negative polarity conversion of the output signal, the circuit is complicated and the precision is not high; [0005] (3) By using the voltage-to-current circuit, slight changes in the voltage will affect the stability of the current output, and the change of multiple resistors in the voltage-to-current circuit with temperature will directly affect the current output. Contents of the invention [0...
Claims
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Login to View More IPC IPC(8): H02M3/00H02M1/32
CPCH02M3/156
Inventor 关克曹雷米哲涛张文江胡冬青朱文琴
Owner NINGBO CRRC TIMES TRANSDUCER TECH CO LTD