A three-out-of-two output circuit based on voltage comparator

Abstract

The present invention discloses a three-out-of-two output circuit based on a voltage comparator, including three-way voltage comparator circuits, each of which includes an input part and an output part; the input part includes a voltage comparator, the input-end of the voltage comparator sets a voltage threshold, the voltage comparator input +end receives an input signal, when the input signal voltage is greater than the voltage threshold, the voltage comparator outputs a high level, when the input signal voltage is less than or equal to the voltage threshold, the voltage comparator outputs a low level; the output part includes a relay, when the voltage comparator outputs a high level, the relay contact is closed, when the voltage comparator outputs a low level, the relay contact is disconnected; when the relay contacts in at least two voltage comparator circuits are closed, the signal is output, otherwise the signal has no output. The present invention has the function of preventing a misjudgment at one time, and can not affect the circuit function when one controller fails, thereby improving the reliability of the circuit.

Description

Technical Field

[0001] The invention belongs to the field of launch vehicle test and launch control, and in particular relates to a two-out-of-three output circuit based on a voltage comparator. Background Art

[0002] Voltage comparator circuits are widely used in the field of aerospace measurement and control. By comparing the input signal with the set threshold, the required high and low level signals are obtained. However, the reliability of the circuit depends on the reliability of the components in the circuit design. When a component fails, it may cause abnormal circuit output, which is difficult to meet the high reliability requirements of aerospace system engineering. Summary of the invention

[0003] The purpose of the present invention is to overcome the above defects and provide a three-out-of-two output circuit based on a voltage comparator, including three voltage comparator circuits, each of which includes an input part and an output part; the input part includes a voltage comparator, the input-end of the voltage comparator sets a voltage threshold, the input +end of the voltage comparator receives an input signal, when the input signal voltage is greater than the voltage threshold, the voltage comparator outputs a high level, when the input signal voltage is less than or equal to the voltage threshold, the voltage comparator outputs a low level; the output part includes a relay, when the voltage comparator outputs a high level, the relay contact is closed, when the voltage comparator outputs a low level, the relay contact is disconnected; when the relay contacts in at least two voltage comparator circuits are closed, the signal is output, otherwise the signal is not output. The present invention has the function of preventing one-time misjudgment, and can not affect the circuit function when one controller fails, thereby improving the reliability of the circuit.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] A three-out-of-two output circuit based on a voltage comparator comprises three voltage comparator circuits, each of which comprises an input part and an output part;

[0006] The input part includes a voltage comparator, the input-end of the voltage comparator sets a voltage threshold, the input+end of the voltage comparator receives an input signal, when the input signal voltage is greater than the voltage threshold, the voltage comparator outputs a high level, when the input signal voltage is less than or equal to the voltage threshold, the voltage comparator outputs a low level;

[0007] The output part includes a relay. When the voltage comparator outputs a high level, the relay contact is closed, and when the voltage comparator outputs a low level, the relay contact is opened;

[0008] When the relay contacts in at least two voltage comparator circuits are closed, the signal is output, otherwise the signal has no output.

[0009] Furthermore, the input part also includes a triode and a diode;

[0010] The base of the transistor is connected to the output end of the voltage comparator, the collector of the transistor is connected to the relay coil, and the emitter of the transistor is connected to the power supply GND; the diode is connected in parallel with the relay coil; and the relay coil is also connected to the power supply Vcc;

[0011] When the voltage comparator outputs a high level, the transistor is turned on, the relay coil is energized, and the relay contacts are closed.

[0012] Furthermore, the input part of at least one voltage comparator circuit includes a power supply voltage stabilization circuit, the power supply voltage stabilization circuit includes >1 capacitor, and the power supply Vcc, each capacitor and the power supply GND are connected in series in sequence.

[0013] Furthermore, the input part of each voltage comparator circuit in the three voltage comparator circuits includes a voltage divider circuit; the voltage divider circuit includes >1 resistor, a power supply Vcc, each resistor and a power supply GND connected in series in sequence;

[0014] The power source Vcc-GND is connected to the input-end of each voltage comparator through the voltage divider circuit of each voltage comparator circuit.

[0015] Further, in the three-way voltage comparator circuit, the input part of one of the voltage comparator circuits includes another voltage divider circuit, and the voltage divider circuit includes >1 resistor, power supply Vcc, each resistor and power supply GND are connected in series in sequence;

[0016] The power source Vcc-GND is simultaneously connected to the voltage comparator input + terminals in the three-way voltage comparator circuit through another voltage divider circuit.

[0017] Further, the first voltage comparator circuit includes a capacitor C1, a capacitor C2, a voltage comparator N1, a transistor BG1, a diode V1, resistors R3, R4, R9, R12, R15, and a relay K1;

[0018] The power supply Vcc, capacitor C1, capacitor C2 and power supply GND are connected in series in sequence to form a power supply voltage stabilization circuit;

[0019] The power supply Vcc, resistor R3, resistor R4 and power supply GND are connected in series to form a voltage divider circuit; the voltage value at the connection point of resistor R3 and resistor R4 is V 1IN- connected to the input terminal of the voltage comparator N1 as the input threshold voltage of N1;

[0020] The Vcc terminal and GND terminal of the voltage comparator N1 are connected to the power supply Vcc and the power supply GND respectively, the output terminal OUT is connected to the base of the transistor BG1 through the resistors R9, R12 and R15, the relay K1 coil is connected to the power supply Vcc and the collector of the transistor BG1, the diode V1 is connected to the relay K1 coil in parallel, and the emitter of the transistor BG1 is connected to the power supply GND;

[0021] When the voltage comparator N1 input + terminal receives the input signal voltage When , the voltage comparator N1 outputs a low level, the transistor BG1 is in the cut-off state, the coil of the relay K1 is not energized, and the corresponding contacts K11 and K12 are in the disconnected state;

[0022] When the voltage comparator N1 input + terminal receives the input signal voltage The voltage comparator N1 outputs a high level, the transistor BG1 is in working state, the coil of the relay K1 is energized, and the corresponding contacts K11 and K12 are closed.

[0023] Further, the second voltage comparator circuit includes a voltage comparator N2, a transistor BG2, a diode V2, resistors R1, R2, R5, R6, R10, R13, R16, and a relay K2;

[0024] The power supply Vcc, resistor R1, resistor R2, adjustable resistor RIN and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection between resistors R2 and R1 is V IN+ Connected to the input + terminal of the voltage comparators N1 to N3;

[0025] The power supply Vcc, resistor R5, resistor R6 and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection point of resistor R5 and resistor R6 is V 2IN- Connected to the input terminal of the voltage comparator N2 as the input threshold voltage of N2;

[0026] The Vcc terminal and GND terminal of the voltage comparator N2 are connected to the power supply Vcc and the power supply GND respectively, the output terminal OUT is connected to the base of the transistor BG2 through the resistors R10, R13 and R16, the relay K2 coil is connected to the power supply Vcc and the collector of the transistor BG2, the diode V2 is connected to the relay K2 coil in parallel, and the emitter of the transistor BG2 is connected to the power supply GND.

[0027] Further, the third voltage comparator circuit includes a voltage comparator N3, a transistor BG3, a diode V3, resistors R7, R8, R11, R14, R17, and a relay K3;

[0028] The power supply Vcc, resistor R7, resistor R8 and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection point of resistor R7 and resistor R8 is V 3IN- Connected to the input terminal of the voltage comparator N3 as the input threshold voltage of N3;

[0029] The Vcc terminal and GND terminal of the voltage comparator N3 are connected to the power supply Vcc and the power supply GND respectively, the output terminal OUT is connected to the base of the transistor BG3 through the resistors R11, R14 and R17, the relay K3 coil is connected to the power supply Vcc and the collector of the transistor BG3, the diode V3 is connected to the relay K3 coil in parallel, and the emitter of the transistor BG3 is connected to the power supply GND.

[0030] Furthermore, the transistor is of NPN type;

[0031] The output signal of the three-to-two output circuit based on the voltage comparator is high or low level, current or resistance.

[0032] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0033] (1) The present invention integrates the voltage comparator circuit with the three-out-of-two circuit, giving full play to the advantages of the three-out-of-two circuit, introducing the input signal into three voltage comparators, the output of the voltage comparator controls the conduction and cutoff of the transistor, and then drives three relay coils. The contacts of the three relays constitute a three-out-of-two output, controlling the connection and disconnection of the output signal, thereby effectively improving the reliability of the circuit;

[0034] (2) The three-out-of-two output circuit based on the voltage comparator of the present invention can effectively improve the reliability of the voltage comparator circuit. When any voltage comparator circuit malfunctions due to damage to a certain component, it does not affect the normal operation of the entire circuit.

[0035] (3) The present invention is based on a three-out-of-two output circuit of a voltage comparator. When any voltage comparator makes a misjudgment, it does not affect the normal operation of the entire circuit.

[0036] (4) The circuit structure of the present invention is simple and has strong applicability, and has broad application prospects in the field of launch vehicle test and launch control. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The circuit diagram of the input part of the three-out-of-two output circuit based on the voltage comparator of the present invention;

[0038] Figure 2 This is a circuit diagram of the output part of the three-out-of-two output circuit based on the voltage comparator of the present invention. DETAILED DESCRIPTION

[0039] The following detailed description of the present invention will make the features and advantages of the present invention more clear and explicit.

[0040] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0041] In view of the shortcoming of insufficient reliability of a single voltage comparator circuit, the present invention proposes a three-out-of-two output circuit based on a voltage comparator, and combines the voltage comparator circuit with a relay and a triode to complete the three-out-of-two circuit design. Compared with single-input single-output and parallel input and output, the circuit of the present invention has the function of preventing misjudgment at one time, and can not affect the circuit function when one controller fails, and at the same time improves the reliability of the circuit through parallel connection.

[0042] like Figure 1 and Figure 2 As shown, a three-out-of-two output circuit based on a voltage comparator of the present invention includes three voltage comparator circuits, each of which includes an input part and an output part; the input part sets a voltage threshold at the voltage comparator input-end, receives an input signal at the voltage comparator +end, and when the input signal voltage is greater than the voltage threshold, the comparator outputs a high level, transistors BG1 to BG3 are turned on, relays K1 to K3 coils are energized, and contacts of the output part relays K1 to K3 are closed, and a signal Vcc is output.

[0043] like Figure 1 As shown, the input part of the three-way voltage comparator circuit includes a power supply Vcc-GND, capacitors C1 and C2, voltage comparators N1 to N3, transistors BG1 to BG3 (NPN type), diodes V1 to V3, resistors R1 to R17, and an adjustable resistor RIN.

[0044] The power source Vcc, the capacitor C1, the capacitor C2 and the power source GND are sequentially connected in series, and the capacitors C1 and C2 function to maintain the power source voltage stable.

[0045] The power supply Vcc, resistor R1, resistor R2, adjustable resistor RIN and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection between resistors R2 and R1 is V IN+ Connected to the input + terminal of the voltage comparators N1 to N3.

[0046] The power supply Vcc, resistor R3, resistor R4 and power supply GND are connected in series to form a voltage divider circuit. The resistance value R3 = R4. The voltage value at the connection between resistor R3 and resistor R4 is V 1IN-connected to the input terminal of the voltage comparator N1 as the input threshold voltage of N1;

[0047] Similarly, the power supply Vcc, resistor R5, resistor R6 and power supply GND are connected in series to form a voltage divider circuit, the resistance value R5 = R6, and the voltage value at the connection between resistor R5 and resistor R6 is V 2IN- Connected to the input terminal of the voltage comparator N2 as the input threshold voltage of N2;

[0048] Similarly, the power supply Vcc, resistor R7, resistor R8 and power supply GND are connected in series to form a voltage divider circuit, the resistance value R7 = R8, and the voltage value at the connection between resistor R7 and resistor R8 is V 3IN- Connected to the input-end of the voltage comparator N3 as the input threshold voltage of N3.

[0049] The Vcc and GND of the voltage comparator N1 are connected to the power supply Vcc and GND respectively, the output OUT is connected to the resistors R9 and R12, the resistors R12 and R15 are connected to the base of the transistor BG1, the relay K1 coil is connected to Vcc and the collector of the transistor BG1, the diode V1 is connected in parallel with the relay K1 coil to realize the anti-peak elimination function, and the emitter of the transistor BG1 is connected to the power supply GND.

[0050] Similarly, Vcc and GND of the voltage comparator N2 are connected to the power supply Vcc and GND respectively, the output OUT is connected to the resistors R10 and R13, the resistors R13 and R16 are connected to the base of the transistor BG2, the relay K2 coil is connected to Vcc and the collector of the transistor BG2, the diode V2 is connected in parallel with the relay K2 coil to realize the anti-peak elimination function, and the emitter of the transistor BG2 is connected to the power supply GND.

[0051] Similarly, Vcc and GND of the voltage comparator N3 are connected to the power supplies Vcc and GND respectively, the output OUT is connected to the resistors R11 and R14, the resistors R14 and R17 are connected to the base of the transistor BG3, the relay K3 coil is connected to Vcc and the collector of the transistor BG3, the diode V3 is connected in parallel with the relay K3 coil to realize the anti-peak elimination function, and the emitter of the transistor BG3 is connected to the power supply GND.

[0052] when When the voltage comparator N1 outputs a low level, the transistor BG1 is in the cut-off state, the relay K1 coil is not energized, and the corresponding contact K 11 , K 12 In the disconnected state; similarly, at this time, N2 and N3 both output low level, transistors BG2 and BG3 are in the cut-off state, relays K2 and K3 coils are not energized, and the corresponding contacts K 21 , K 22 , K 31 , K32 In disconnected state, Figure 2 OUT output is low level.

[0053] when The voltage comparator N1 outputs a high level, the transistor BG1 is in working state, the coil of the relay K1 is energized, and the corresponding contact K 11 , K 12 Similarly, at this time, N2 and N3 both output high level, transistors BG2 and BG3 are in working state, relays K2 and K3 coils are energized, and the corresponding contacts K 21 , K 22 , K 31 , K 32 ,closure, Figure 2 OUT output is high level.

[0054] The voltage threshold of the reference terminal (input-terminal) of the voltage comparator can be set according to actual needs. It can be directly connected to the negative terminal of the power supply, or it can be set by resistor voltage division with different resistance values.

[0055] The input signal terminal can be a voltage value controlled by a variable resistance value, or a voltage value input directly.

[0056] The output signal controlled by the relay contact can be high or low level, current or resistance, etc.

[0057] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

[0058] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A three-out-of-two output circuit based on a voltage comparator, characterized in that: It includes three voltage comparator circuits, each of which includes an input part and an output part; The input part includes a voltage comparator, the input-end of the voltage comparator sets a voltage threshold, the input+end of the voltage comparator receives an input signal, when the input signal voltage is greater than the voltage threshold, the voltage comparator outputs a high level, when the input signal voltage is less than or equal to the voltage threshold, the voltage comparator outputs a low level; The output part includes a relay. When the voltage comparator outputs a high level, the relay contact is closed, and when the voltage comparator outputs a low level, the relay contact is opened; When the relay contacts in at least two voltage comparator circuits are closed, the signal is output, otherwise the signal has no output.

2. A three-out-of-two output circuit based on a voltage comparator according to claim 1, characterized in that: The input part also includes transistors and diodes; The base of the transistor is connected to the output end of the voltage comparator, the collector of the transistor is connected to the relay coil, and the emitter of the transistor is connected to the power supply GND; the diode is connected in parallel with the relay coil; and the relay coil is also connected to the power supply Vcc; When the voltage comparator outputs a high level, the transistor is turned on, the relay coil is energized, and the relay contacts are closed.

3. A three-out-of-two output circuit based on a voltage comparator according to claim 1 or 2, characterized in that: The input part of at least one voltage comparator circuit includes a power supply voltage stabilization circuit, which includes >1 capacitor, and the power supply Vcc, each capacitor and the power supply GND are connected in series in sequence.

4. A three-out-of-two output circuit based on a voltage comparator according to claim 1 or 2, characterized in that: The input part of each voltage comparator circuit in the three-way voltage comparator circuit includes a voltage divider circuit; the voltage divider circuit includes >1 resistor, power supply Vcc, each resistor and power supply GND are connected in series in sequence; The power source Vcc-GND is connected to the input-end of each voltage comparator through the voltage divider circuit of each voltage comparator circuit.

5. The three-out-of-two output circuit based on voltage comparator according to claim 4, characterized in that: In the three-way voltage comparator circuit, the input part of one of the voltage comparator circuits includes another voltage divider circuit, and the voltage divider circuit includes >1 resistor, power supply Vcc, each resistor and power supply GND are connected in series in sequence; The power source Vcc-GND is simultaneously connected to the voltage comparator input + terminals in the three-way voltage comparator circuit through another voltage divider circuit.

6. A two-out-of-three output circuit based on a voltage comparator according to claim 1 or 2, characterized in that: The first voltage comparator circuit includes capacitor C1, capacitor C2, voltage comparator N1, transistor BG1, diode V1, resistors R3, R4, R9, R12, R15, and relay K1; The power supply Vcc, capacitor C1, capacitor C2 and power supply GND are connected in series in sequence to form a power supply voltage stabilization circuit; The power supply Vcc, resistor R3, resistor R4 and power supply GND are connected in series to form a voltage divider circuit; the voltage value at the connection point of resistor R3 and resistor R4 is V 1IN- connected to the input terminal of the voltage comparator N1 as the input threshold voltage of N1; The Vcc terminal and GND terminal of the voltage comparator N1 are connected to the power supply Vcc and the power supply GND respectively, the output terminal OUT is connected to the base of the transistor BG1 through the resistors R9, R12 and R15, the relay K1 coil is connected to the power supply Vcc and the collector of the transistor BG1, the diode V1 is connected to the relay K1 coil in parallel, and the emitter of the transistor BG1 is connected to the power supply GND; When the voltage comparator N1 input + terminal receives the input signal voltage When , the voltage comparator N1 outputs a low level, the transistor BG1 is in the cut-off state, the coil of the relay K1 is not energized, and the corresponding contacts K11 and K12 are in the disconnected state; When the voltage comparator N1 input + terminal receives the input signal voltage The voltage comparator N1 outputs a high level, the transistor BG1 is in working state, the coil of the relay K1 is energized, and the corresponding contacts K11 and K12 are closed.

7. The three-out-of-two output circuit based on voltage comparator according to claim 6, characterized in that: The second voltage comparator circuit includes a voltage comparator N2, a transistor BG2, a diode V2, resistors R1, R2, R5, R6, R10, R13, R16, and a relay K2; The power supply Vcc, resistor R1, resistor R2, adjustable resistor RIN and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection between resistors R2 and R1 is V IN+ Connected to the input + terminal of the voltage comparators N1 to N3; The power supply Vcc, resistor R5, resistor R6 and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection point of resistor R5 and resistor R6 is V 2IN- Connected to the input terminal of the voltage comparator N2 as the input threshold voltage of N2; The Vcc terminal and GND terminal of the voltage comparator N2 are connected to the power supply Vcc and the power supply GND respectively, the output terminal OUT is connected to the base of the transistor BG2 through the resistors R10, R13 and R16, the relay K2 coil is connected to the power supply Vcc and the collector of the transistor BG2, the diode V2 is connected to the relay K2 coil in parallel, and the emitter of the transistor BG2 is connected to the power supply GND.

8. The three-out-of-two output circuit based on voltage comparator according to claim 7, characterized in that: The third voltage comparator circuit includes a voltage comparator N3, a transistor BG3, a diode V3, resistors R7, R8, R11, R14, R17, and a relay K3; The power supply Vcc, resistor R7, resistor R8 and power supply GND are connected in series to form a voltage divider circuit. The voltage value at the connection point of resistor R7 and resistor R8 is V 3IN- Connected to the input terminal of the voltage comparator N3 as the input threshold voltage of N3; The Vcc terminal and GND terminal of the voltage comparator N3 are connected to the power supply Vcc and the power supply GND respectively, the output terminal OUT is connected to the base of the transistor BG3 through the resistors R11, R14 and R17, the relay K3 coil is connected to the power supply Vcc and the collector of the transistor BG3, the diode V3 is connected to the relay K3 coil in parallel, and the emitter of the transistor BG3 is connected to the power supply GND.

9. The three-out-of-two output circuit based on voltage comparator according to claim 2, characterized in that: The transistor is of NPN type; The output signal of the three-to-two output circuit based on the voltage comparator is high or low level, current or resistance.

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