CN216526789U - Digital quantity output circuit - Google Patents
Digital quantity output circuit Download PDFInfo
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- CN216526789U CN216526789U CN202122087690.7U CN202122087690U CN216526789U CN 216526789 U CN216526789 U CN 216526789U CN 202122087690 U CN202122087690 U CN 202122087690U CN 216526789 U CN216526789 U CN 216526789U
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Abstract
The utility model provides a digital quantity output circuit, and belongs to the field of electronic circuits. The digital quantity output circuit includes: the device comprises a first output unit, a second output unit, a first control unit and a second control unit; the control end of the first output unit is connected with the output end of the first control unit and the output end of the second control unit, the control end of the second output unit is connected with the output end of the first control unit and the output end of the second control unit, and the output end of the first output unit is connected with the input end of the second output unit; the first control unit generates and sends a first control signal; the second control unit generates and transmits a second control signal; the first output unit executes on-off switching according to the received first control signal and the second control signal; the second output unit executes on-off switching according to the received first control signal and the second control signal. The utility model solves the problem that the output can not be turned off due to the fault of the single-pole output circuit, and ensures the safety of the digital output circuit.
Description
Technical Field
The utility model relates to the field of electronic circuits, in particular to a digital quantity output circuit.
Background
A conventional digital safety output circuit, such as a digital safety output circuit applied to a rail transit signal system, uses a MOSFET (metal-oxide semiconductor field effect transistor) as a control element of the digital safety output circuit, as shown in fig. 1. The digital quantity safety output circuit comprises a MOSFET and a monitoring circuit; the MOSFET is respectively connected with the main controller and the load and is used for controlling the on-off of the load according to a digital quantity output signal output by the main controller; the monitoring circuit is respectively connected with the MOSFET and the main controller and is used for monitoring the on-off signal of the MOSFET and feeding back a digital quantity output state feedback signal to the main controller according to the on-off signal of the MOSFET. The prior art can realize real-time monitoring of the output state of the MOSFET through a monitoring circuit, and further can realize real-time monitoring of the digital quantity output state.
When a single-point fault occurs in a circuit, the MOSFET cannot necessarily cut off an output signal, which affects system safety.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model aims to provide a digital quantity output circuit, which solves the problem of output safety of a digital quantity safety output circuit.
In order to achieve the above object, an embodiment of the present invention provides a digital quantity output circuit, including: the device comprises a first output unit, a second output unit, a first control unit and a second control unit; the control end of the first output unit is connected with the output end of the first control unit and the output end of the second control unit, the control end of the second output unit is connected with the output end of the first control unit and the output end of the second control unit, and the output end of the first output unit is connected with the input end of the second output unit;
the first control unit is used for generating and sending a first control signal;
the second control unit is used for generating and sending a second control signal;
the first output unit is used for executing on-off switching according to the received first control signal and the second control signal;
the second output unit is used for executing on-off switching according to the received first control signal and the second control signal.
Optionally, the digital output circuit further includes: a power supply unit;
the power supply output end of the power supply unit is connected to the input end of the first output unit;
the first control unit is further used for generating and transmitting a third control signal;
the second control unit is also used for generating and sending a fourth control signal;
the control end of the power supply unit is connected with the output end of the first control unit and the output end of the second control unit, and the power supply unit is used for executing on-off switching of power supply output according to a third control signal and a fourth control signal.
Optionally, the digital output circuit further includes: a third output unit;
and the output end of the second output unit is connected to the control end of the third output unit and is used for controlling the on-off switching of the third output unit.
Optionally, the digital output circuit further includes:
and the output detection circuit is used for detecting the output state signal of the third output unit and outputting the output state signal to the first control unit and the second control unit.
Optionally, the digital output circuit further includes:
and the cutting acquisition circuit is used for acquiring the output state signal of the power supply unit and outputting the output state signal to the first control unit and the second control unit.
Optionally, the digital output circuit further includes:
and the first acquisition circuit is used for acquiring the voltage signal output by the second output unit and outputting the voltage signal to the first control unit and the second control unit.
Optionally, the digital output circuit further includes:
and the second acquisition circuit is used for acquiring the voltage signal output by the second output unit and outputting the voltage signal to the first control unit and the second control unit.
Optionally, the first output unit includes:
a transistor MOS1 and a first control circuit;
the first control circuit is used for controlling the on-off of the transistor MOS1 according to the received first control signal and the second control signal output signal.
Optionally, the second output unit includes:
a transistor MOS2 and a second control circuit;
the second control circuit is used for controlling the on-off of the transistor MOS2 according to the received first control signal and the second control signal output signal.
Optionally, the third output unit includes a relay;
the output end of the second output unit is specifically connected to the control loop of the relay and used for controlling on-off switching of the relay;
and the detection end of the output detection circuit is connected to the control loop of the relay.
This application adopts first control unit and the break-make of second output unit of second control unit simultaneous control first output unit and break-make at this patent, through first output unit's output is connected the input of second output unit has formed the two-stage series connection redundant circuit, has solved the unable problem of shutoff output of the trouble of unipolar output circuit, has guaranteed digital output circuit's security.
Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the embodiments of the utility model without limiting the embodiments of the utility model. In the drawings:
fig. 1 is a block diagram of a conventional digital quantity safety output circuit indicated in the background of the utility model;
fig. 2 is a schematic diagram of a digital quantity output circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a first acquisition circuit or a second acquisition circuit or a cutting acquisition circuit provided in an embodiment of the present invention;
FIG. 4 is a schematic diagram of an output detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a first control circuit, a second control circuit, or a cutting control circuit according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the utility model refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the utility model, are given by way of illustration and explanation only, not limitation.
In the description of the present invention, it is also to be noted that, unless explicitly stated or limited otherwise, the term "connected" is to be understood broadly, and may for example be a communication between two elements; may be a connected isoelectric point. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 2, a digital quantity output circuit includes: a first output unit 4, a second output unit 5, a first control unit 1, and a second control unit 2; the output end of the first output unit 4 is connected with the input end of the second output unit 5; the control end of the first output unit 4 is connected with the output end of the first control unit 1 and the output end of the second control unit 2, and the control end of the second output unit 5 is connected with the output end of the first control unit 1 and the output end of the second control unit 2;
the first control unit 1 is used for generating and sending a first control signal; the second control unit 2 is used for generating and sending a second control signal; the first output unit 4 is configured to perform on-off switching according to the received first control signal and the second control signal; the second output unit 5 is configured to perform on-off switching according to the received first control signal and the second control signal. The patent only indicates that the first control unit 1 and the second control unit 2 belong to the normal state when the first control unit 1 and the second control unit 2 output the control signals belonging to the normal level, such as the high level; the first output unit 4 and the second output unit 5 are both conducted, so that a series circuit formed by the first output unit 4 and the second output unit 5 can transmit signals to be output, and when any one of the first output unit 4 and the second output unit 5 is short-circuited due to overcurrent and overvoltage, the transmission signals can be terminated, so that the safety is further ensured. The first control unit 1 and the second control unit 2 are preferably implemented by the CPU1 and the CPU2 in the present embodiment to improve the versatility of the digital quantity output circuit.
The digital quantity output circuit further includes: a power supply unit 3; the control end of the power supply unit 3 is connected with the output end of the first control unit 1 and the output end of the second control unit 2; the power output end of the power supply unit 3 is connected to the input end of the first output unit 4; the first control unit 1 is further configured to generate and transmit a third control signal; the second control unit 2 is further configured to generate and send a fourth control signal; the power supply unit 3 is used for executing on-off switching of power supply output according to the third control signal and the fourth control signal. Further, the digital output circuit further includes: the first acquisition circuit is used for acquiring the voltage signal output by the second output unit 5 and outputting the voltage signal to the first control unit 1 and the second control unit 2. And the second acquisition circuit is used for acquiring the voltage signal output by the second output unit 5 and outputting the voltage signal to the first control unit 1 and the second control unit 2. When the third control signal and the fourth control signal are at low level, it indicates that the voltage output by the digital output circuit (i.e. the voltage signal output by the second output unit 5) is inconsistent with the control results of the first control unit 1 and the second control unit 2, i.e. the first output unit 4 and the second output unit 5 are faulty. At this time, the third control signal and the fourth control signal are at low level, and the first output unit 4 and the second output unit 5 are actively turned off, so that the safety of the digital output circuit is improved.
Optionally, the digital output circuit further includes: a third output unit 6; the output end of the second output unit 5 is connected to the control end of the third output unit 6, and is used for controlling on-off switching of the third output unit 6. The third output unit 6 is preferably a relay; the output end of the second output unit 5 is specifically connected to a control loop of the relay and used for controlling on-off switching of the relay; and the detection end of the output detection circuit is connected to the control loop of the relay.
Further, the digital output circuit further includes: and an output detection circuit for detecting an output state signal of the third output unit 6 and outputting the output state signal to the first control unit 1 and the second control unit 2. The design enables the states of a control loop and an output loop (a loop where a load is located) of the relay to have a monitoring function; the double CPUs (the CPU1 and the CPU2) directly acquire and monitor the state of a control loop of the relay through an output detection circuit; the dual CPUs collect and monitor the state of the output loop through the output detection circuit. Therefore, output double monitoring is realized, the output control loop and the output loop are isolated through the safety relay again, namely, the control and the output are in a completely isolated state, and the safety and the stability of the digital output circuit are further improved.
Preferably, the digital quantity output circuit further includes: and the cutting acquisition circuit is used for acquiring a state signal output by the power supply unit 3 and outputting the state signal to the first control unit 1 and the second control unit 2. When the third control signal and the fourth control signal are at low level, it indicates that the voltage output by the digital output circuit (i.e. the voltage signal output by the second output unit 5) is inconsistent with the control results of the first control unit 1 and the second control unit 2, i.e. the first output unit 4 and the second output unit 5 are faulty. At this time, when the first control unit 1 and the second control unit 2 detect that the output state signal of the acquisition power supply unit 3 is at a high level, it indicates that the power supply unit 3 is still outputting, and both the first control unit 1 and the second control unit 2 output a low level signal to control the acquisition power supply unit 3 to be turned off. Preferably, the power supply unit 3 comprises: a safety power supply, an output cut-off relay and a cut-off control circuit; the power end of the safety power supply is connected with the upper interface of the output loop of the output cut-off relay; the lower interface of the output circuit of the output cut-off relay serves as the output of the power supply unit 3. The cutting control circuit receives control signals of the first control unit 1 and the second control unit 2 to control the cutting relay to be switched on and off.
The digital output circuit forms a three-stage control mode of safe output of the digital output circuit to realize control and complete isolation of output, and improves safety and stability through on-off control of the power supply unit 3, on-off control of the first output unit 4 and the second output unit 5, and on-off control of the third output unit 6.
In order to better implement the solution of the present invention, further implementation is made below.
As shown in fig. 4, the output detection circuit includes: an optical coupler and a level conversion circuit; the level conversion circuit is used for acquiring the voltage of a control loop in the third output unit 6; the optocoupler is used for signal isolation between the first control unit 1 and the second control unit 2 and the level conversion circuit. The level shifter circuit includes a transistor Q3, a transistor Q4, and resistors (R5-R7). The resistor R7 is connected to the control loop of the relay in the third output unit 6, and the current flows through the resistor R7 to enter the base of the transistor Q3, so that the transistor Q3 is conducted; current flows through transistor Q3, resistor R6 into the base of transistor Q4, causing transistor Q4 to turn on; respectively flows into two optical couplers (an optical coupler 3 and an optical coupler 4); the optical coupler 3 is connected with an IO14 end of the CPU 2; and the optical coupler 4 is connected with the IO9 end of the CPU 1. The circuits controlled and collected by the CPU (CPU2 and CPU1) have an isolation effect, so that the interference of an output side to a control side can be effectively prevented, the CPU and a control circuit power supply network are protected, the safety performance of the control circuit is improved, and the application range of the circuit is widened. Therefore, the method can be suitable for occasions with more complex load environments and more interference.
As shown in fig. 2 and 5, the first output unit 4 includes: a transistor MOS1 and a first control circuit; the first control circuit is used for controlling the on-off of the transistor MOS1 according to the received first control signal and the second control signal output signal.
The second output unit 5 includes: a transistor MOS2 and a second control circuit;
the second control circuit is used for controlling the on-off of the transistor MOS2 according to the received first control signal and the second control signal output signal.
The first control circuit, the second control circuit and the cutting control circuit can adopt the same schematic diagram, and specific parameters can be selected according to limited calculation. When the first control unit 1 and the second control unit 2 output signals such as high level or low level simultaneously, the signals flow into the base of the transistor Q in the circuit shown in fig. 5, so that the transistor Q is switched off or switched on, and the voltage at the upper end of the R4 is lowered or pulled up, thereby controlling the voltage of the coil end of the cut-off relay or the gate of the transistor MOS1 or the transistor MOS2 output by the subsequent circuit.
As shown in fig. 2 and 3, the same schematic diagram can be used for the first acquisition circuit or the second acquisition circuit or the ablation acquisition circuit, and specific parameters can be selected according to a limited number of calculations. When the output cut-off relay is closed or there is an output from the transistor MOS2, the right current in fig. 3 flows through the resistor R2 into the base of the transistor Q2, causing the transistor Q2 to turn on; current flows through transistor Q2 into the base of transistor Q1, causing transistor Q1 to turn on; after the currents respectively flowing through the transistor Q1 and the resistor R1 are combined, the currents respectively flow into two optical couplers (an optical coupler 1 and an optical coupler 2); the two optical couplers are respectively correspondingly connected with IO ports of two CPUs (CPU2 and CPU 1).
The digital output circuit has an isolation effect through circuits controlled and collected by the CPU, and the output of the MOS tube (MOS1 and MOS2) is isolated from an output loop (a loop where a load is located) through a relay again, namely the control and the output are in a completely isolated state. Usually, the power supply, control and acquisition circuit of the CPU is lower than that of the output circuit, so that the interference of the output side to the control side can be effectively prevented by increasing the isolation, the CPU and the power supply network of the control circuit are protected, the safety performance of the control circuit is increased, and the application range of the circuit is improved.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the utility model. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (10)
1. A digital quantity output circuit, comprising:
a first output unit (4), a second output unit (5), a first control unit (1) and a second control unit (2); the control end of the first output unit (4) is connected with the output end of the first control unit (1) and the output end of the second control unit (2), the control end of the second output unit (5) is connected with the output end of the first control unit (1) and the output end of the second control unit (2), and the output end of the first output unit (4) is connected with the input end of the second output unit (5);
the first control unit (1) is used for generating and sending a first control signal;
the second control unit (2) is used for generating and sending a second control signal;
the first output unit (4) is used for executing on-off switching according to the received first control signal and the second control signal;
the second output unit (5) is used for executing on-off switching according to the received first control signal and the second control signal.
2. The digital quantity output circuit according to claim 1, further comprising: a power supply unit (3);
the control end of the power supply unit (3) is connected with the output end of the first control unit (1) and the output end of the second control unit (2), and the output end of the power supply unit (3) is connected with the input end of the first output unit (4);
the first control unit (1) is further configured to generate and transmit a third control signal;
the second control unit (2) is also used for generating and sending a fourth control signal;
the power supply unit (3) is used for executing on-off switching of power supply output according to the third control signal and the fourth control signal.
3. The digital quantity output circuit according to claim 1, further comprising: a third output unit (6);
the output end of the second output unit (5) is connected with the control end of the third output unit (6).
4. The digital quantity output circuit according to claim 3, further comprising:
and the output detection circuit is used for detecting the output state signal of the third output unit (6) and outputting the output state signal to the first control unit (1) and the second control unit (2).
5. The digital quantity output circuit according to any one of claims 1 to 4, further comprising:
and the cutting acquisition circuit is used for acquiring the output state signal of the power supply unit (3) and outputting the output state signal to the first control unit (1) and the second control unit (2).
6. The digital quantity output circuit according to any one of claims 1 to 4, further comprising:
and the first acquisition circuit is used for acquiring the voltage signal output by the second output unit (5) and outputting the voltage signal to the first control unit (1) and the second control unit (2).
7. The digital quantity output circuit according to any one of claims 1 to 4, further comprising:
and the second acquisition circuit is used for acquiring the voltage signal output by the second output unit (5) and outputting the voltage signal to the first control unit (1) and the second control unit (2).
8. Digital quantity output circuit according to any of claims 1-4, characterized in that the first output unit (4) comprises:
a transistor MOS1 and a first control circuit;
the first control circuit is used for controlling the on-off of the transistor MOS1 according to the first control signal and the second control signal.
9. Digital quantity output circuit according to any of claims 1-4, characterized in that the second output unit (5) comprises:
a transistor MOS2 and a second control circuit;
the second control circuit is used for controlling the on-off of the transistor MOS2 according to the first control signal and the second control signal.
10. Digital quantity output circuit according to claim 4, characterized in that the third output unit (6) comprises a relay;
the output end of the second output unit (5) is connected with a control loop of the relay and is used for controlling on-off switching of the relay;
and the detection end of the output detection circuit is connected with the control loop of the relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122087690.7U CN216526789U (en) | 2021-08-31 | 2021-08-31 | Digital quantity output circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122087690.7U CN216526789U (en) | 2021-08-31 | 2021-08-31 | Digital quantity output circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216526789U true CN216526789U (en) | 2022-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122087690.7U Active CN216526789U (en) | 2021-08-31 | 2021-08-31 | Digital quantity output circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216526789U (en) |
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2021
- 2021-08-31 CN CN202122087690.7U patent/CN216526789U/en active Active
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