Multifunctional circuit and system

Abstract

The embodiment of the utility model discloses a multifunctional circuit and system, and belongs to the field of circuits. The multifunctional circuit comprises a first port, a second port, a first electric heating wire, a second electric heating wire, a first branch circuit and a second branch circuit. When the current is input from the first port and output from the second port, the current flows through the first branch, and the first heating wire and the second heating wire are heated; and when the current is input from the second port and output from the first port, the current flows through the second branch. According to the embodiment of the invention, the multifunctional circuit has multiple functions through the first branch circuit, the second branch circuit and different current flow directions, and the technical effects of reducing the structural complexity and the cost are achieved.

Description

Technical Field

[0001] This application relates to the field of circuits, and more specifically, to a multifunctional circuit and system. Background Technology

[0002] Current circuits typically need to integrate multiple functions, such as both heating and temperature detection. However, as the number of functions increases, the complexity of the circuit structure also increases, leading to high circuit costs. Summary of the Invention

[0003] This application provides a multifunctional circuit and system to at least solve the technical problem of high circuit cost.

[0004] According to a first aspect of the embodiments of this application, a multifunctional circuit is provided, including a first port, a second port, a first heating wire, a second heating wire, a first branch and a second branch, wherein a temperature-changing element is provided on the second branch, and the resistance of the temperature-changing element changes based on the temperature change;

[0005] The first end of the first heating wire is connected to the first port;

[0006] The first end of the second heating wire is connected to the second port;

[0007] The first branch and the second branch are connected in parallel and are connected between the second end of the first heating wire and the second end of the second heating wire;

[0008] When the current is input from the first port and output from the second port, the current flows through the first branch, and the first heating wire and the second heating wire heat up.

[0009] When the current is input from the second port and output from the first port, the current flows through the second branch.

[0010] In this embodiment, the first and second heating wires can generate heat. By adding a first and a second branch, the current flows in different directions, allowing the current to flow through either the first or second branch, thus controlling the heating of the first and second heating wires and the temperature of the temperature-changing element. When the first and second heating wires heat up, the circuit provides heating. When the temperature-changing element changes temperature, its resistance changes accordingly, allowing the circuit to measure the temperature. Through the first and second branches and the different current flows, the multifunctional circuit possesses multiple functions, reducing structural complexity and cost.

[0011] In conjunction with the first aspect, in one optional implementation of the embodiments of this application, a current-blocking diode is provided on the first branch;

[0012] The positive terminal of the current-blocking diode is connected to the second end of the first heating wire, and the negative terminal is connected to the second end of the second heating wire.

[0013] In conjunction with the first aspect, in one optional implementation of the embodiments of this application, the first heating wire and the second heating wire are parallel.

[0014] In conjunction with the first aspect, in one optional implementation of the embodiments of this application, the parallel wire between the first branch and the second branch is a heating wire.

[0015] According to a second aspect of the embodiments of this application, a multifunctional system is provided, including a control circuit and the multifunctional circuit described above;

[0016] The control circuit includes a first switch circuit, a second switch circuit, a third switch circuit, and a fourth switch circuit;

[0017] Both the first and fourth switch circuits are connected to the first port, and both the second and third switch circuits are connected to the second port.

[0018] The multifunctional system is configured as follows:

[0019] During temperature control, the first and second switching circuits are turned on, and current is input from the first switching circuit, flows through the multifunctional circuit, and is output from the second switching circuit.

[0020] During temperature measurement, the third and fourth switching circuits are turned on, and the current is input from the third switching circuit, flows through the multifunctional circuit, and is output from the fourth switching circuit.

[0021] In this embodiment, a simple multifunctional circuit is used, enabling the multifunctional system to achieve both temperature control and temperature measurement functions at a low cost.

[0022] In conjunction with the second aspect, in an optional implementation of the embodiments of this application, the first switch circuit, the second switch circuit, the third switch circuit, and the fourth switch circuit form an H-bridge circuit with respect to the multifunctional circuit.

[0023] In conjunction with the second aspect, in one optional implementation of the embodiments of this application, the first switching circuit includes a first input terminal for supplying current input;

[0024] The first output terminal is connected to the first port;

[0025] The first MOSFET has its gate connected to the control terminal of the controller, its source connected to the first input terminal, and its drain connected to the first output terminal.

[0026] In conjunction with the second aspect, in one optional implementation of the embodiments of this application, the second switching circuit includes a second input terminal connected to the second port;

[0027] The second output terminal is used to output current;

[0028] The second MOSFET has its gate connected to the control terminal of the controller, its drain connected to the second input terminal, and its source connected to the second output terminal.

[0029] In conjunction with the second aspect, in an optional implementation of the embodiments of this application, the multifunctional system further includes the controller;

[0030] A current sensing element is provided between the source of the second MOSFET and the second output terminal. The current sensing element is used to detect the current and feed back the detected current value to the controller.

[0031] The controller is configured to control the degree of closure of the first and second switching circuits based on the current value fed back by the current sensor.

[0032] In conjunction with the second aspect, in an optional implementation of the embodiments of this application, the multifunctional system further includes a controller;

[0033] The third switching circuit includes a third input terminal for supplying current input;

[0034] The third output terminal is connected to the second port;

[0035] A first diode, the positive terminal of which is connected to the third input terminal, and the negative terminal of which is connected to the third output terminal;

[0036] A voltage detection element is connected in series between the third input terminal and the first diode to detect voltage and feed the detected voltage value back to the controller;

[0037] The controller is configured to calculate the temperature of the first heating wire and / or the second heating wire based on the voltage value fed back by the voltage sensor.

[0038] In conjunction with the second aspect, in an optional implementation of the embodiments of this application, the fourth switching circuit includes a fourth input terminal connected to the first port;

[0039] The fourth output terminal is used to output current;

[0040] The first transistor has its base connected to the control terminal of the controller, its emitter connected to the fourth output terminal, and its collector connected to the fourth input terminal. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structure of a multifunctional circuit provided in an embodiment of this application;

[0042] Figure 2 This is a structural block diagram of a multifunctional system provided in an embodiment of this application;

[0043] Figure 3 This is a circuit diagram of a multifunctional system provided in an embodiment of this application.

[0044] Labeling explanation: 1. First port; 2. Second port; 3. First heating wire; 4. Second heating wire; 5. Second branch; 6. First branch. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0046] It should be understood that "multiple" as mentioned herein refers to two or more. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, to facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first," "second," etc., are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first," "second," etc., do not limit the quantity or execution order, and the terms "first," "second," etc., do not necessarily imply differentness.

[0047] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0048] First, the terminology used in the embodiments of this application will be introduced.

[0049] H-bridge circuit: An H-bridge consists of four switching devices (such as transistors or MOSFETs). These switching devices are divided into two groups, with two in each group connected in series, and then the two groups are connected in parallel to form an "H"-shaped structure. The H-bridge changes the current flow path by controlling the on / off state of the four switching devices.

[0050] The terminology used in the embodiments of this application has been introduced above. Next, a multifunctional circuit provided by the embodiments of this application will be further described.

[0051] like Figure 1 As shown, the multifunctional circuit provided in this application embodiment includes a first port 1, a second port 2, a first heating wire 3, a second heating wire 4, a first branch 6 and a second branch 5. The second branch 5 is provided with a temperature-changing element, and the resistance of the temperature-changing element changes based on the temperature change.

[0052] The first end of the first heating wire 3 is connected to the first port 1;

[0053] The first end of the second heating wire 4 is connected to the second port 2;

[0054] The first branch 6 and the second branch 5 are connected in parallel and are connected between the second end of the first heating wire 3 and the second end of the second heating wire 4.

[0055] When the current is input from the first port 1 and output from the second port 2, the current flows through the first branch 6, and the first heating wire 3 and the second heating wire 4 are heated.

[0056] When the current is input from the second port 2 and output from the first port 1, the current flows through the second branch 5.

[0057] Here, the first port 1 and the second port 2 can be physical wiring ports, or they can be understood as two ends of a multifunctional circuit used for inputting and outputting current. These two ends can be any physical object capable of transmitting current, such as the first end of the first heating wire 3 as the first port 1 and the second end of the second heating wire 4 as the second port 2. The temperature-changing element can be a thermistor.

[0058] The first branch 6 and the second branch 5 are connected in parallel. When current is input from the first port 1, the current will pass through the first branch 6 and not through the second branch 5. This could be because the first branch 6 is in an open circuit state. Similarly, when current is input from the second port 2, the current will pass through the second branch 5 and not through the first branch 6. This could be because the components in the first branch 6 block the current from the first port 1, forcing the current to flow through the second branch 5. For example, the first branch 6 may contain components such as diodes or valves. This embodiment does not limit which components the first branch 6 includes, as long as it can change the current flow path.

[0059] In this embodiment, the first heating wire 3 and the second heating wire 4 can generate heat. By adding a first branch 6 and a second branch 5, the current flows through either the first branch 6 or the second branch 5 when the current direction is different, thereby controlling the heating of the first heating wire 3 and the second heating wire 4, as well as the temperature change of the temperature-changing element. Specifically, when the first heating wire 3 and the second heating wire 4 heat up, the circuit can perform a heating function. When the temperature-changing element changes temperature, its resistance changes accordingly, allowing the circuit to measure the temperature based on the resistance value of the temperature-changing element. Through the first branch 6, the second branch 5, and the different current directions, the multifunctional circuit possesses multiple functions, reducing structural complexity and cost.

[0060] In one possible embodiment of this application, such as Figure 1 As shown, a choke diode D21 is provided on the first branch 6;

[0061] The positive terminal of the current-blocking diode is connected to the second end of the first heating wire 3, and the negative terminal is connected to the second end of the second heating wire 4.

[0062] In one embodiment, the choke diode on the first branch 6 can be replaced with a transistor, MOSFET, etc., and the transistor or MOSFET can be turned on and off by connecting to a controller. Specifically, when the transistor or MOSFET is turned on, the current flows through the first branch 6 and not through the second branch 5 (because the first branch 6 is equivalent to an open circuit). When the transistor or MOSFET is turned off, the first branch 6 is equivalent to an open circuit, and the current flows through the second branch 5 and not through the first branch 6.

[0063] Optionally, in one implementation of this embodiment, the first heating wire 3 and the second heating wire 4 are parallel.

[0064] The parallel arrangement of the first heating wire 3 and the second heating wire 4 facilitates uniform heating of pipes and other objects, ensuring heating safety and efficiency.

[0065] Optionally, in one implementation of this embodiment, the parallel wire between the first branch 6 and the second branch 5 is a heating wire.

[0066] Specifically, the first branch 6 includes a choke diode, and the second branch 5 includes a temperature-regulating element. The positive terminal of the choke diode is connected to the second end of the first heating wire 3 via a third heating wire, and the negative terminal of the choke diode is connected to the second end of the second heating wire 4 via a fourth heating wire. The first end of the temperature-regulating element is connected to the second end of the first heating wire 3 via a fifth heating wire, and the second end of the temperature-regulating element is connected to the second end of the second heating wire 4 via a sixth heating wire. Preferably, the third and fourth heating wires are integrally formed with the first heating wire 3, and the fifth and sixth heating wires are integrally formed with the second heating wire 4. This reduces the use of wires and improves the heating range and heating efficiency of the heating wires.

[0067] This application also provides a multifunctional system, such as... Figure 2 As shown, it includes a control circuit and the aforementioned multifunctional circuit;

[0068] The control circuit includes a first switch circuit, a second switch circuit, a third switch circuit, and a fourth switch circuit;

[0069] The first switch circuit and the fourth switch circuit are both connected to the first port 1, and the second switch circuit and the third switch circuit are both connected to the second port 2;

[0070] The multifunctional system is configured as follows:

[0071] During temperature control, the first and second switching circuits are turned on, and current is input from the first switching circuit, flows through the multifunctional circuit, and is output from the second switching circuit.

[0072] During temperature measurement, the third and fourth switching circuits are turned on, and the current is input from the third switching circuit, flows through the multifunctional circuit, and is output from the fourth switching circuit.

[0073] For ease of understanding, during temperature control, the current enters from the first switching circuit, passes through the first switching circuit, first port 1, first heating wire 3, first branch 6 (current-blocking diode), second heating wire 4, second port 2, and the second switching circuit, and then returns to the negative terminal of the power supply, forming a closed-loop circuit. During temperature measurement, the current enters from the third switching circuit, passes through the third switching circuit, second port 2, second heating wire 4, second branch 5 (temperature-changing element), first heating wire 3, first port 1, and the fourth switching circuit, and then returns to the negative terminal of the power supply, forming a closed-loop circuit.

[0074] In this embodiment, a simple multifunctional circuit is used, enabling the multifunctional system to achieve both temperature control and temperature measurement functions at a low cost.

[0075] Optionally, in one implementation of this embodiment, the first switch circuit, the second switch circuit, the third switch circuit, and the fourth switch circuit form an H-bridge circuit with respect to the multifunctional circuit.

[0076] Optionally, in one implementation of this embodiment, the first switching circuit includes a first input terminal for supplying current input;

[0077] The first output terminal is connected to the first port 1;

[0078] The first MOSFET has its gate connected to the control terminal of the controller, its source connected to the first input terminal, and its drain connected to the first output terminal.

[0079] In one embodiment, the controller may be an external controller, not part of the multifunctional system. The controller's control terminal is used to control whether the gate of the first MOSFET is energized or de-energized. When de-energized, no current can be transmitted between the source and drain of the first MOSFET; otherwise, current can be transmitted.

[0080] Optionally, in one implementation of this embodiment, the second switching circuit includes a second input terminal connected to the second port 2;

[0081] The second output terminal is used to output current;

[0082] The second MOSFET has its gate connected to the control terminal of the controller, its drain connected to the second input terminal, and its source connected to the second output terminal.

[0083] Optionally, in one implementation of this embodiment, the multifunctional system further includes the controller;

[0084] A current sensing element is provided between the source of the second MOSFET and the second output terminal. The current sensing element is used to detect the current and feed back the detected current value to the controller.

[0085] The controller is configured to control the degree of closure of the first and second switching circuits based on the current value fed back by the current sensor.

[0086] Optionally, in one implementation of this embodiment, the multifunctional system further includes a controller;

[0087] The third switching circuit includes a third input terminal for supplying current input;

[0088] The third output terminal is connected to the second port 2.

[0089] A first diode, the positive terminal of which is connected to the third input terminal, and the negative terminal of which is connected to the third output terminal;

[0090] A voltage detection element is connected in series between the third input terminal and the first diode to detect voltage and feed the detected voltage value back to the controller;

[0091] The controller is configured to calculate the temperature of the first heating wire 3 and / or the second heating wire 4 based on the voltage value fed back by the voltage sensor.

[0092] Optionally, in one implementation of this embodiment, the fourth switching circuit includes a fourth input terminal connected to the first port 1;

[0093] The fourth output terminal is used to output current;

[0094] The first transistor has its base connected to the control terminal of the controller, its emitter connected to the fourth output terminal, and its collector connected to the fourth input terminal.

[0095] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0096] In one specific implementation of this application embodiment, the multifunctional system includes the following:

[0097] principle:

[0098] The heating circuit consists of two heating wires (the first heating wire and the second heating wire) and a temperature measuring resistor (the temperature variable element). The current can flow in two directions. The MCU controls the switch to make the high voltage and large current flow in the forward direction (from the first port to the second port) through the heating circuit for heating. The MCU controls the switch to make the low voltage and small current flow in the reverse direction (from the second port to the first port) through the heating circuit for temperature measurement. The entire multi-functional system can be understood as a letter H shape, with the current entering from the upper left and exiting from the lower right for heating and heat preservation, and the current entering from the upper right and exiting from the lower left for temperature measurement.

[0099] Specifically, such as Figure 3As shown, during heating, control switches Q5 (first MOSFET) and Q12 (second MOSFET) are turned on. Current flows from VIN36 (first input terminal) through fuse R149, through switch Q5, and into the heating wire from interface J1 connected to J2. The closing of Q6 (first transistor) and the blocking of D20 (first diode) cause the current to flow through the heating wire, through the path of D21 (current blocking diode), through Q12, and then through U18 (current sensing device, preferably a current sensing chip, which converts the current into voltage and outputs it through pin 7) back to the negative terminal. The degree of closure of switches Q5 and Q12 is controlled by current monitoring and temperature measurement, thereby achieving the purpose of controlling the temperature of the heating wire and the heating speed.

[0100] When measuring the temperature at the pipeline terminal, control switches Q5 and Q12 are closed, while Q6 and U35 (voltage sensing element, preferably a voltage sensing chip) are opened. At this time, current flows out from VREF3. Because Q5 and Q12 are closed, the current flows through U35, through the heating wire, along the NTC (temperature variable element, preferably a thermistor, equivalent to a temperature sensor) path, and then back to the negative terminal through Q6. Since the resistance of the NTC changes with temperature, the voltage at the RTH2P position also changes. The temperature is calculated from the collected voltage value.

[0101] Note: When current flows through the heating wire, it passes through D21 in the forward direction and NTC in the reverse direction because when the current is in the forward direction, the resistance of D21 is almost zero, NTC is short-circuited, and the current flows through D21. When the current is in the reverse direction, the characteristic of D21 causes D21 to be open-circuited, and the current flows through NTC.

[0102] The sequence numbers or order of description of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0103] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0104] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0105] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0106] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A multi-function circuit, characterized by, The multifunctional circuit comprises a first port, a second port, a first heating wire, a second heating wire, a first branch and a second branch, wherein the second branch is provided with a temperature-variable component, and the resistance of the temperature-variable component changes based on the change of temperature. The first end of the first heating wire is connected with the first port. The first end of the second heating wire is connected with the second port. The first branch and the second branch are connected in parallel between the second end of the first heating wire and the second end of the second heating wire. When the current is input from the first port and output from the second port, the current flows through the first branch, and the first heating wire and the second heating wire are heated. When the current is input from the second port and output from the first port, the current flows through the second branch.

2. The multi-functional circuit according to claim 1, wherein The first branch is provided with a current-blocking diode. The anode of the current-blocking diode is connected with the second end of the first heating wire, and the cathode is connected with the second end of the second heating wire.

3. The multi-functional circuit according to claim 1, wherein The first heating wire and the second heating wire are parallel.

4. The multi-functional circuit according to any one of claims 1 to 3, characterized by, The parallel wire between the first branch and the second branch is a heating wire.

5. A multi-functional system characterized by, The multifunctional system comprises a control circuit and the multifunctional circuit of any one of claims 1-4. The control circuit comprises a first switch circuit, a second switch circuit, a third switch circuit and a fourth switch circuit. The first switch circuit and the fourth switch circuit are connected with the first port, and the second switch circuit and the third switch circuit are connected with the second port. The multifunctional system is configured to: When temperature control is performed, the first switch circuit and the second switch circuit are turned on, the current is input from the first switch circuit, flows through the multifunctional circuit and is output from the second switch circuit. When temperature measurement is performed, the third switch circuit and the fourth switch circuit are turned on, the current is input from the third switch circuit, flows through the multifunctional circuit and is output from the fourth switch circuit.

6. The multi-functional system of claim 5, wherein, The first switch circuit, the second switch circuit, the third switch circuit and the fourth switch circuit form an H-bridge circuit with respect to the multifunctional circuit.

7. The multi-functional system of claim 5, wherein, The first switch circuit comprises a first input end for inputting current. A first output end is connected with the first port. A first MOS tube, the gate of the first MOS tube is connected with the control end of a controller, the source of the first MOS tube is connected with the first input end, and the drain of the first MOS tube is connected with the first output end.

8. The multi-functional system of claim 5, wherein, The second switch circuit comprises a second input end connected with the second port. A second output end for outputting current. A second MOS tube, the gate of the second MOS tube is connected with the control end of a controller, the drain of the second MOS tube is connected with the second input end, and the source of the second MOS tube is connected with the second output end.

9. The multi-functional system of claim 8, wherein, The multifunctional system further comprises the controller. A current detection component is arranged between the source of the second MOS tube and the second output end, and the current detection component is used for detecting current and feeding back the detected current value to the controller. The controller is configured to control the closing degree of the first switch circuit and the second switch circuit according to the current value fed back by the current detection component.

10. The multi-functional system of claim 5, wherein, The multifunctional system further comprises a controller. The third switch circuit comprises a third input end for current input; a third output end connected with the second port; a first diode, a positive electrode of the first diode being connected with the third input end, and a negative electrode of the first diode being connected with the third output end; a voltage detection member connected in series between the third input end and the first diode, for detecting voltage and feeding back a detected voltage value to the controller; the controller being configured to calculate the temperature of the first heating wire and / or the second heating wire according to the voltage value fed back by the voltage detection member.

11. The multi-functional system of claim 5, wherein, The fourth switch circuit comprises a fourth input end connected with the first port; a fourth output end for outputting current; a first triode, a base of the first triode being connected with a control end of the controller, an emitter of the first triode being connected with the fourth output end, and a collector of the first triode being connected with the fourth input end.

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