Control circuit outputting three states through two control ports

Abstract

The utility model provides a control circuit outputting three states through two control ports, and belongs to the field of control circuits. The utility model relates to a control circuit capable of outputting three states through two control ports, which comprises a first control port, a second control port, a control signal output module, a first control module and a second control module, the input end of the first control module is connected with a power supply, the control end of the first control module is connected with the first control port, the other end of the second control module is grounded, and the control end of the second control module is connected with the second control port. The beneficial effects of the utility model are that the circuit is compatible with a conventional control circuit, and does not affect the control of other control circuits during high-resistance state output.

Description

Technical Field

[0001] The utility model relates to the field of control circuits, in particular to a control circuit which outputs three states through two control ports. Background Art

[0002] At present, the control circuits of electronic products are specially designed for the controlled circuits and are not compatible with other control circuits. If the original control circuit fails, it means loss of control and permanent damage to the entire equipment, causing equipment loss or even personal injury to the user. Therefore, it is particularly necessary to design a control circuit that is compatible with the existing control circuit and can switch control in time when the existing control circuit fails. Utility Model Content

[0003] In order to solve the problems in the prior art, the utility model provides a control circuit which outputs three states through two control ports.

[0004] The utility model outputs a control circuit of three states from two control ports, including a first control port, a second control port, a control signal output module, a first control module, and a second control module, wherein one end of the control signal output module is used to output a control signal, and the other end is respectively connected to an output end of the first control module and an output end of the second control module, the input end of the first control module is connected to a power supply, and the control end is connected to the first control port, and the other end of the second control module is grounded, and the control end is connected to the second control port.

[0005] Furthermore, the first control module includes a transistor Q1 and a switch tube Q3, wherein the source of the switch tube Q3 is connected to the power output end, the drain is connected to the control signal output module, the gate is connected to the source of the switch tube Q3 through a first resistor, and is connected to the collector of the transistor Q1 through a second resistor, the emitter of the transistor Q1 is grounded, and the base is connected to the first control port.

[0006] Furthermore, it also includes a fool-proof module, one end of which is connected to the collector of the transistor Q1, and the other end of which is connected to the second control port.

[0007] Furthermore, the fool-proof module is a diode D1, and the anode of the diode D1 is connected to the output end of the second control port.

[0008] Furthermore, the second control module includes a switch tube Q2, the drain of the switch tube is connected to the input end of the control signal output module through a third resistor, the source of the switch tube Q2 is grounded, and the gate is connected to the second control port.

[0009] Furthermore, the control signal output module includes a capacitor C2 and a transient voltage suppression diode D2, wherein one end of the capacitor C2 and the transient voltage suppression diode D2 is grounded, and the other end is connected to the signal output end.

[0010] Furthermore, it also includes a single chip microcomputer for outputting a control signal, wherein the single chip microcomputer is provided with two output terminals, and the two output terminals are respectively connected to the first control port and the second control port.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the control circuit of the utility model is compatible with the existing control circuit, and does not affect the control of other control circuits when the high-impedance state is output. Moreover, when the existing control circuit loses control, it can respond and control in parallel on the original control circuit to output three states, which has wide compatibility and high safety, and plays an irreplaceable emergency role at critical moments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 This is a schematic diagram of the application scenario of the utility model;

[0014] Figure 2 This is a circuit diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0015] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0016] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present invention may be combined with other embodiments.

[0017] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, in existing control devices, such as switches, electrical equipment, etc., there are already corresponding controlled circuits and control circuits ( Figure 1 Other control circuits in the equipment), based on the existing circuit, in order to avoid problems such as loss of control and permanent damage to the entire equipment caused by failure of the control circuit, the control circuit of the utility model is designed. The control circuit of the utility model is connected in parallel with the existing control circuit. When other control circuits work normally, it does not affect the control of other control circuits. When the existing control circuit loses control, it can respond in time, output control signals, and realize the switching of control rights. The emergence of this control circuit enables the equipment to have multiple controls, which is also an additional guarantee.

[0019] like Figure 2 As shown, the utility model outputs a control circuit of three states from two control ports, including a first control port A, a second control port B, a control signal output module, a first control module, and a second control module, wherein one end of the control signal output module is used to output a control signal, and the other end is respectively connected to the output end of the first control module and the output end of the second control module, the input end of the first control module is connected to a power supply, and the control end is connected to the first control port A, the other end of the second control module is grounded, and the control end is connected to the second control port B.

[0020] In this example, the first control module includes a transistor Q1 and a switch tube Q3, wherein the source of the switch tube Q3 is connected to the power output end, the drain is connected to the control signal output module, the gate is connected to the source of the switch tube Q3 through a first resistor, and is connected to the collector of the transistor Q1 through a second resistor, the emitter of the transistor Q1 is grounded, and the base is connected to the first control port A.

[0021] Preferably, it also includes a foolproof module, one end of which is connected to the collector of the transistor Q1, and the other end is connected to the second control port B. In this example, the foolproof module is a diode D1, and the anode of the diode D1 is connected to the output end of the second control port. Due to the existence of the diode D1, when the first control port A outputs a high level, the second control port B is invalid, and the foolproof operation is realized.

[0022] The second control module in this example includes a switch tube Q2, the drain of which is connected to the input end of the control signal output module through a third resistor, the source of which is grounded, and the gate of which is connected to the second control port B.

[0023] The control signal output module of this example includes a capacitor C2 and a transient suppression diode D2, wherein one end of the capacitor C2 and the transient suppression diode D2 is grounded, and the other end is connected to the signal output end. Due to the presence of the transient suppression diode TVS tube D2, the control circuit is effectively protected from being damaged by surge voltage and external static electricity.

[0024] The circuit of this example can be compatible with an existing controller or single-chip microcomputer, and a single-chip microcomputer for outputting a control signal can also be separately provided, wherein the single-chip microcomputer has two output terminals, and the two output terminals are respectively connected to the first control port and the second control port. The single-chip microcomputer of this example can communicate with the original control circuit, and when the original control circuit fails to communicate, it can be determined that a fault has occurred, and timely switching of control can be achieved.

[0025] The working principle of the utility model is:

[0026] The present invention has two control ports (A, B). When A and B are both 0 (low level), the output is high impedance, which has no effect on the controlled circuit. When AB is 01, the output is 1 (high level). When AB is 1X, the output is 0 (low level). The OUT terminal output has three states. The specific control is shown in Table 1.

[0027]

[0028] Table 1 Truth table of two control ports

[0029] Specifically, when the first control port A is at a high level and there is no control signal at the second control port B, the transistor Q1 is turned on, the gate level of the switch tube Q3 is pulled down, the switch tube Q3 is turned on, and the power supply voltage is output to the control signal output module of the subsequent stage through the switch tube Q3, and the OUT terminal outputs a high level. The diode D2 can effectively prevent the signal from flowing to the switch tube Q2 connected to the B control port, and will not cause the switch tube Q2 to operate incorrectly.

[0030] When the first control port A is at a low level and the second control port B is at a low level, the switch tube Q3 and the switch tube Q2 are not turned on, so the control signal output module has no signal turned on and is in a high-impedance state, and there is no output at the OUT end. At this time, there is no effect on the subsequent control circuit, and other control modules can control the subsequent control circuit.

[0031] When the first control port A is at a low level and the second control port B is at a high level, the first control module has no output, the switch tube Q2 is turned on, the OUT terminal is grounded through the switch tube Q2, and a low level is output.

[0032] To sum up, the control circuit of the utility model is compatible with the existing control circuit, and does not affect the control of other control circuits when outputting in the high-impedance state. It is controlled in parallel on the original control circuit and outputs three states, which has wide compatibility and high safety, and plays an irreplaceable emergency role at critical moments.

[0033] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. A control circuit with three states output by two control ports, characterized in that: It includes a first control port, a second control port, a control signal output module, a first control module, and a second control module, wherein one end of the control signal output module is used to output a control signal, and the other end is respectively connected to the output end of the first control module and the output end of the second control module, the input end of the first control module is connected to a power supply, and the control end is connected to the first control port, and the other end of the second control module is grounded, and the control end is connected to the second control port.

2. The control circuit for outputting three states through two control ports according to claim 1, characterized in that: The first control module includes a transistor Q1 and a switch tube Q3, wherein the source of the switch tube Q3 is connected to the power output end, the drain is connected to the control signal output module, the gate is connected to the source of the switch tube Q3 through a first resistor, and is connected to the collector of the transistor Q1 through a second resistor, the emitter of the transistor Q1 is grounded, and the base is connected to the first control port.

3. The control circuit for outputting three states through two control ports according to claim 2, characterized in that: It also includes a fool-proof module, one end of which is connected to the collector of the transistor Q1, and the other end is connected to the second control port.

4. The control circuit for outputting three states through two control ports according to claim 3, characterized in that: The fool-proof module is a diode D1, and the anode of the diode D1 is connected to the output end of the second control port.

5. The control circuit for outputting three states through two control ports according to claim 1, characterized in that: The second control module includes a switch tube Q2, the drain of which is connected to the input end of the control signal output module via a third resistor, the source of which is grounded, and the gate of which is connected to the second control port.

6. The control circuit for outputting three states through two control ports according to claim 1, characterized in that: The control signal output module includes a capacitor C2 and a transient suppression diode D2, wherein one end of the capacitor C2 and the transient suppression diode D2 is grounded, and the other end is connected to the signal output end.

7. The control circuit for outputting three states through two control ports according to any one of claims 1 to 6, characterized in that: It also includes a single chip microcomputer for outputting a control signal. The single chip microcomputer is provided with two output terminals, and the two output terminals are respectively connected to the first control port and the second control port.

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