A level conversion circuit
A technology for converting circuits and levels, which is applied in the connection/interface arrangement of logic circuits, and the coupling/interfaces of logic circuits using field effect transistors. Effect
Active Publication Date: 2019-11-08
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology
This structure requires a comparator and a reference voltage, and the implementation is more complicated and the cost is higher.
Method used
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Embodiment Construction
[0017] Such as Figure 4 As shown, Embodiment 1 of the present invention includes a first triode V1 and a second triode V3; the base of the first triode V1 is connected to the first voltage dividing resistor R2 and the second voltage dividing resistor R3 Between (the first voltage dividing resistor R2 and the second voltage dividing resistor R3 are connected in series to form a voltage circuit); one end of the first voltage dividing resistor R2 is input with a positive power supply voltage (15V level), and one end of the second voltage dividing resistor R3 is connected to the second The collector of the triode V3 is connected; the collector of the first triode V1 inputs the positive power supply voltage (15V level) through the pull-up resistor R1, and the collector of the first triode V1 outputs Positive level signal OUT; the emitter of the first triode V1 is grounded to GND (0V); the emitter of the first triode V1 is connected to one end of the first adjustment resistor R4; t...
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The invention discloses a level conversion circuit. The first electrode of a first transistor is connected with the midpoint of a voltage dividing circuit; positive power supply voltage is inputted to one end of the voltage dividing circuit, and the other end of the voltage dividing circuit is connected with the second electrode of a second transistor; positive power supply voltage is inputted to the second electrode of the first transistor via a pull-up resistor; the third electrode of the first transistor is grounded; the third electrode of the first transistor is connected with one end of an adjusting branch; the first electrode of the second transistor is connected with one end of a second adjusting resistor, and a negative level signal or high impedance is inputted to the other end of the second adjusting resistor and the other end of the adjusting branch; negative power supply voltage is inputted to the third electrode of the second transistor; and one end of a third adjusting resistor is connected in parallel between the second adjusting resistor and the first electrode of the second transistor, and the other end of the third adjusting resistor is connected with the third electrode of the second transistor. The level conversion circuit is simple in circuit structure with no requirement for a comparator or reference voltage so that circuit cost is reduced.
Description
technical field [0001] The invention relates to an electronic circuit system, in particular to a level conversion circuit. Background technique [0002] In modern electronic circuit systems, it generally includes plus or minus 15VDC, plus or minus 24VDC, 5VDC, 3.3VDC and other power supplies. In order to further improve the reliability of the system, the system needs to monitor the working status of its power supply. Therefore, each power supply needs to provide its own fault signal to the control system. [0003] For a power supply with positive voltage output, its fault signal is a positive level signal, such as figure 1 As shown, signal transmission is relatively easy. At present, there are many logic chips that can realize level conversion to achieve the purpose of signal transmission. [0004] For the power supply with negative voltage output, its fault signal is a negative level signal, such as figure 2 As shown, the negative level signal needs to be converted int...
Claims
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IPC IPC(8): H03K19/0185
Inventor 谭红林陈修林王富光曾宏
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST