A voltage acquisition circuit that automatically adapts to a wide voltage input range

Abstract

The present invention discloses a voltage acquisition circuit that automatically adapts to a wide voltage input range, comprising: a first end and a second end, for simulating a DC signal source that generates an input voltage; a first voltage-stabilizing diode connected to both ends of the DC signal source; a switch device as an output end; a transistor connected to the first end and the first input end of the switch device; a second voltage-stabilizing diode used in conjunction with the transistor to adaptively control the input voltage range of a subsequent circuit; a resistor connected to the first end and the second voltage-stabilizing diode for current limiting; and a third voltage-stabilizing diode connected to the second input end and the second end of the switch device for limiting the opening of the switch device. The present invention improves the reliability of signal acquisition.

Description

Technical Field

[0001] The invention relates to a voltage acquisition circuit. Background Art

[0002] The acquisition of input signals is an important part of the rail transit field, and it is necessary to collect and monitor the input voltage to determine the input status. The existing voltage acquisition range in the rail transit field is currently limited to 0-24V, with a small acquisition range and low acquisition efficiency. When the input voltage range is increased, the existing acquisition module cannot adapt to its wide range adjustment, and when a fault occurs due to the widening of the voltage range, it is difficult to locate the fault. Summary of the invention

[0003] The object of the present invention is to provide a voltage acquisition circuit which can automatically adapt to a wide voltage input range, thereby improving the reliability of signal acquisition.

[0004] The technical solution to achieve the above purpose is:

[0005] A voltage acquisition circuit automatically adapting to a wide voltage input range, comprising:

[0006] A first terminal and a second terminal are provided for simulating a DC signal source for generating an input voltage;

[0007] A first voltage stabilizing diode connected to both ends of the DC signal source;

[0008] As a switching device at the output end;

[0009] a transistor connected to the first terminal and the first input terminal of the switching device;

[0010] A second voltage stabilizing diode connected to the second end and the base of the transistor and used in conjunction with the transistor to adaptively control the input voltage range of the subsequent circuit;

[0011] A resistor connecting the first end and the second voltage stabilizing diode for current limiting; and

[0012] A third voltage stabilizing diode is connected to the second input terminal of the switch device and the second terminal and is used to limit the switching device from being turned on.

[0013] Preferably, the cathode of the first voltage stabilizing diode is connected to the first end, and the anode is connected to the second end.

[0014] Preferably, the emitter of the transistor is connected to the first input terminal of the switching device, and the collector is connected to the first terminal.

[0015] Preferably, the cathode of the second voltage stabilizing diode is connected to the base of the transistor and the resistor, and the anode is connected to the second end.

[0016] Preferably, the first input terminal of the switch device is an input anode, and the second input terminal is an input cathode;

[0017] The cathode of the third voltage stabilizing diode is connected to the second input terminal, and the anode of the third voltage stabilizing diode is connected to the second terminal.

[0018] The beneficial effects of the present invention are as follows: the present invention can effectively enhance the acquisition capability of the signal loop through effective and reasonable circuit design, widen the acquisition voltage range, can adapt to input voltages of 0 to 60V and above, and improve the acquisition efficiency. In addition, the circuit has high integration, does not require multiple circuits to cooperate with the acquisition of signals in different input ranges, has a small size, and is low in cost. At the same time, the collected signal is processed by the voltage stabilization and switch circuit, the signal is stable, the reliability of the input signal acquisition is improved, and the driving safety of the rail vehicle is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The invention discloses a circuit diagram of a voltage acquisition circuit capable of automatically adapting to a wide voltage input range. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] See also Figure 1 The voltage acquisition circuit of the present invention which automatically adapts to a wide voltage input range includes: a DC signal source S1, a first voltage zener diode Z1, a transistor D1, a second voltage zener diode Z2, a switch device U1, a resistor R1, and a third voltage zener diode Z3.

[0022] The DC signal source S1 is provided with a first terminal P and a second terminal N, and is used to simulate and generate an input voltage. A first voltage stabilizing diode Z1 is connected to the first terminal P and the second terminal N, and is used to protect the circuit from inputting safely.

[0023] The switch device U1 is used as an output terminal. The transistor D1 is connected to the first terminal P and the first input terminal of the switch device U1. The second voltage stabilizing diode Z2 is connected to the second terminal N and the base of the transistor D1, and the second voltage stabilizing diode Z2 cooperates with the transistor D1 to adaptively control the input voltage range of the subsequent circuit.

[0024] The resistor R1 is connected to the first terminal P and the second voltage stabilizing diode Z2 for current limiting. The third voltage stabilizing diode Z3 is connected to the second input terminal and the second terminal N of the switch device U1 for limiting the opening of the switch device U1.

[0025] Specifically, the circuit design is as follows: the cathode of the first voltage stabilizing diode Z1 is connected to the first terminal P, and the anode is connected to the second terminal N. The emitter of the transistor D1 is connected to the first input terminal of the switching device U1, and the collector is connected to the first terminal P. The cathode of the second voltage stabilizing diode Z2 is connected to the base of the transistor D1 and the resistor R1, and the anode is connected to the second terminal N. The first input terminal of the switching device U1 is the input terminal anode, and the second input terminal is the input terminal cathode. The cathode of the third voltage stabilizing diode Z3 is connected to the second input terminal, and the anode is connected to the second terminal N.

[0026] In the figure, input represents input, and output represents output. In the adaptive wide voltage acquisition state of the circuit of the present invention, the current flows as follows: P terminal of DC power supply S1 → first voltage zener diode Z1 → resistor R1 → second voltage zener diode Z2 → transistor D1 → switch device U1 → third voltage zener diode Z3 → output terminal of switch device U1.

[0027] In summary, the technical solution of the present invention can effectively enhance the acquisition capability of the signal loop, widen the acquisition voltage range, can adapt to input voltages of 0 to 60V and above, improve the acquisition efficiency, and have good reliability.

[0028] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A voltage acquisition circuit that automatically adapts to a wide voltage input range, characterized in that: include: A first terminal and a second terminal are provided for simulating a DC signal source for generating an input voltage; A first voltage stabilizing diode connected to both ends of the DC signal source; As a switching device at the output end; a transistor connected to the first terminal and the first input terminal of the switching device; A second voltage stabilizing diode connected to the second end and the base of the transistor and used in conjunction with the transistor to adaptively control the input voltage range of the subsequent circuit; A resistor connected to the first end and the second voltage stabilizing diode for current limiting; as well as A third voltage stabilizing diode connected to the second input terminal of the switch device and the second terminal, and used for limiting the switching device from turning on; The cathode of the first voltage stabilizing diode is connected to the first end, and the anode is connected to the second end; The emitter of the transistor is connected to the first input terminal of the switch device, and the collector is connected to the first terminal; The cathode of the second voltage stabilizing diode is connected to the base of the transistor and the resistor, and the anode is connected to the second end; The first input terminal of the switch device is an input anode, and the second input terminal is an input cathode; The cathode of the third voltage stabilizing diode is connected to the second input terminal, and the anode of the third voltage stabilizing diode is connected to the second terminal.

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