Control circuit and heating and ventilation equipment

Abstract

The utility model relates to a control circuit and heating and ventilation equipment. The circuit is applied to the heating and ventilation equipment, the heating and ventilation equipment comprises load valves, and the circuit comprises a power supply module used for supplying power, a controller, valve switch modules in one-to-one correspondence with the load valves of the heating and ventilation equipment and a valve type selection switch. The valve switch module is connected with the control level output end of the controller and used for opening or closing a load valve according to the output level of the control level output end. The valve type selection switch is connected with the control level input end of the controller and used for generating a state level to switch the output level of the control level output end of the controller. According to the utility model, the control circuit can be matched with different types of load valves by switching the working state of the control circuit, so that the production efficiency is improved, and the error probability during cargo allocation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and more specifically, to a control circuit and a heating, ventilation and air conditioning (HVAC) device. Background Art

[0002] In air conditioners or HVAC products, floor heating is commonly used as a heating device in winter. However, when currently designing HVAC devices, different floor heating controls need to be configured according to different climate regions in the south and north. For example, in the north where winters are long, normally open valves are commonly used, while in the south where winters are short, normally closed valves are commonly used. Different valves result in different specific control circuits, which makes the production efficiency of the controller for HVAC devices low and prone to configuration errors. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a control circuit and an HVAC device for the defect that the above-mentioned valve control circuit design in the prior art cannot be unified.

[0004] The technical solution adopted by the utility model to solve its technical problem is to construct a control circuit applied to an HVAC device. The HVAC device includes a load valve. The control circuit includes: a power supply module for power supply, a controller, a valve switch module corresponding to the load valve of the HVAC device one by one, and a valve type selection switch;

[0005] The valve switch module is connected to the control level output end of the controller and is used to open or close the load valve according to the output level of the control level output end;

[0006] The valve type selection switch is connected to the control level input end of the controller and is used to generate a status level to switch the output level of the control level output end of the controller.

[0007] In an embodiment of the control circuit of the utility model, the control circuit further includes a valve status indication module corresponding to the valve switch module;

[0008] The valve status indication module and the valve switch module are connected to the same control level output end of the controller;

[0009] The valve status indication module is connected to the valve type selection switch and is used to receive the output level of the control level output end of the controller to generate indication information for indicating the working status of the load valve.

[0010] In an embodiment of the control circuit of the utility model, the valve switch module includes a relay, a first diode, and a drive switch;

[0011] The first end of the relay is connected to the power supply module, the second end of the relay is connected to the load valve, the third end of the relay is connected to the anode of the first diode and the first end of the drive switch, and the fourth end of the relay is connected to the cathode of the first diode and the power supply module;

[0012] The second end of the drive switch is grounded, and the third end of the drive switch is connected to the control level output end of the controller.

[0013] In an embodiment of the control circuit of the present utility model, the drive switch includes a triode, a first resistor, and a second resistor;

[0014] The collector of the triode is connected to the third end of the relay, the base of the triode is connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the control level output end of the controller, and the emitter of the triode and the second end of the second resistor are grounded.

[0015] In an embodiment of the control circuit of the present utility model, the valve state indication module includes: a single-pole double-throw switch, a first light-emitting diode, a second light-emitting diode, a third resistor, and a fourth resistor;

[0016] The input end of the single-pole double-throw switch is connected to the control level output end of the controller, the first output end of the single-pole double-throw switch is connected to the anode of the first light-emitting diode, the cathode of the first light-emitting diode is connected to the first end of the third resistor, and the second end of the third resistor is grounded;

[0017] The second output end of the single-pole double-throw switch is connected to the cathode of the second light-emitting diode, the anode of the second light-emitting diode is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the power supply module;

[0018] The control end of the single-pole double-throw switch is connected to the valve type selection switch.

[0019] In an embodiment of the control circuit of the present utility model, the valve type selection switch includes a first DIP switch, a fifth resistor, a sixth resistor, and a first capacitor;

[0020] The first end of the first DIP switch is connected to the first end of the fifth resistor, the first end of the sixth resistor, and the first end of the first capacitor;

[0021] The second end of the fifth resistor is connected to the control level input end of the controller, the second end of the sixth resistor is connected to the power supply module, and the second end of the first capacitor and the second end of the first DIP switch are grounded.

[0022] In an embodiment of the control circuit of the present utility model, when the number of the valve switch modules is multiple, the control circuit further includes an address selection module;

[0023] The controller is connected to the address selection module, and is configured to receive the input level of the address selection module and switch the output of the control level output terminal of the controller.

[0024] In an embodiment of the control circuit of the present utility model, the address selection module includes a DIP switch group including at least one second DIP switch;

[0025] The first end of each second DIP switch is respectively connected to a control level input terminal of the controller, and the second end of the second DIP switch is grounded.

[0026] In an embodiment of the control circuit of the present utility model, the control circuit further includes a connector, and the valve switch module is connected to the load valve through the connector.

[0027] The present utility model also constructs a heating, ventilation and air conditioning (HVAC) device, including: an HVAC device working circuit, and the control circuit as described above, wherein the control circuit is connected to the HVAC device working circuit and is configured to control the operation of the HVAC device working circuit.

[0028] Implementing a control circuit and an HVAC device of the present utility model has the following beneficial effects: By switching the working state of the control circuit, the control circuit can be made to match different types of load valves, improving production efficiency and reducing the error probability during goods allocation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0030] Figure 1 is a logic block diagram of an embodiment of the control circuit of the present utility model;

[0031] Figure 2 is a logic block diagram of another embodiment of the control circuit of the present utility model;

[0032] Figure 3 is a logic block diagram of another embodiment of the control circuit of the present utility model;

[0033] Figure 4 is a partial circuit schematic diagram of an embodiment of the control circuit of the present utility model;

[0034] Figure 5 is a partial circuit schematic diagram of another embodiment of the control circuit of the present utility model;

[0035] Figure 6It is the partial circuit schematic diagram of another embodiment of the control circuit of the present utility model. Detailed implementation manners

[0036] For a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings.

[0037] As Figure 1 shown, an embodiment of the control circuit of the present utility model is disclosed. The control circuit is applied to a heating, ventilation, and air conditioning (HVAC) device, where the HVAC device includes a load valve 200. In Figure 1 the shown embodiment of the control circuit of the present utility model, the control circuit includes: a power supply module 110 for power supply, a controller 120, a valve switch module 130 corresponding to the load valve 200 of the HVAC device one by one, and a valve type selection switch 140; the valve switch module 130 is connected to the control level output terminal of the controller 120 and is used to open or close the load valve according to the output level of the control level output terminal; the valve type selection switch 140 is connected to the control level input terminal of the controller 120 and is used to generate a status level to switch the output level of the control level output terminal of the controller 120. Specifically, in the control circuit, the state of the load valve 200 can be controlled through the valve switch module 130, for example, controlling the load valve 200 to be in an open or off state. The working state of the valve switch module 130 can be controlled by the output level of the control level output terminal of the controller 120. That is, the working state of the valve switch module 130 is triggered by the high level or low level output by the corresponding control level output terminal to realize the opening or closing of the load valve 200. The valve type selection switch 140 can switch the output level of the control level output terminal of the controller 120 by switching the input level of the control level input terminal of the controller 120. Finally, the control process of the working state of the load valve 200 by the valve type selection switch 140 is realized, so as to enable the control circuit to match different load valves.

[0038] Furthermore, it can be understood that the output level of the control level output terminal of the controller 120 can be switched by the valve type selection switch 140, so that the valve switch module 130 can control the working state of the load valve 200 with an accurate control process. For example, when the load valve 200 is a normally open valve, when it is necessary to operate the load corresponding to the HVAC equipment, the valve switch module 130 can be made not to act through the output level of the control level output terminal of the controller 120, and then the load valve 200 is maintained in the open state. When it is necessary to close the load valve 200, the output level of the control level output terminal of the controller 120 can be switched to make the valve switch module 130 drive the load valve 200 to close. In this way, in winter, the valve switch module 130 can be maintained in the non-operating state for most of the time. However, when the load valve 200 is a normally closed valve, in the case of a winter scenario, the output level of the control level output terminal of the controller 120 can be switched by the valve type selection switch 140 to keep the load valve 200 in the open state. That is, at this time, the controller 120 knows that the load valve 200 is a normally closed valve according to the switched working mode of the valve switch module 130, and can control the opening or closing of the load valve through the control process for the normally closed valve. By setting the valve type selection switch 140, the controller 120 can determine whether the current load valve corresponds to a normally open switch or a normally closed switch, and then output the corresponding level to implement the corresponding control process.

[0039] Optionally, as Figure 2 shown, the control circuit further includes a valve state indication module 132 corresponding to the valve switch module 130; the valve switch module 130 and the valve state indication module 132 are connected to the same control level output terminal of the controller 120; the valve state indication module 132 is connected to the valve type selection switch 140 and is used to receive the output level of the control level output terminal of the controller to generate indication information for indicating the working state of the load valve 200.

[0040] Specifically, in the control circuit, during the process of controlling the on / off of the valve switch module 130 through the control level output terminal of the controller 120 and then controlling the working state of the load valve 200, the valve state indication module 132 can indicate the current state of the load valve 200. For example, when the load valve 200 is a normally closed valve, the valve type selection switch 140 is set to the corresponding state to generate a corresponding selection level, that is, the state level, and the controller 120 receives the corresponding selection level. In a specific embodiment, when the selection level received by the controller 120 is high, it is confirmed that the load valve 200 is a normally closed valve. At this time, the load valve can be switched between open and closed by outputting high and low levels. At the same time, when the selection level received by the valve state indication module 132 is high, it is obtained that the load valve 200 is a normally closed valve, and then the corresponding indication information is triggered and generated according to the output level of the control level output terminal of the controller 120. For example, when the output level is high, corresponding to driving the valve to open, the valve state indication module 132 generates a first indication information indicating that the load valve 200 is in the open state at this time. When the corresponding output level of the controller 120 is low, corresponding to driving the valve to close, the valve state indication module 132 generates a second indication information indicating that the load valve 200 is in the closed state at this time. When the selection level received by the controller 120 is low, it is determined that the load valve 200 is a normally open valve. At this time, the load valve can be switched between closed and open by outputting high and low levels. When the selection level received by the valve state indication module 132 is low, it is obtained that the load valve 200 is a normally open valve, and then the corresponding indication information is triggered and generated according to the output level of the control level output terminal of the controller 120. For example, when the output level is low, corresponding to driving the valve to open, the valve state indication module 132 generates a first indication information indicating that the load valve 200 is in the open state at this time. When the output level is high, corresponding to driving the valve to close, the valve state indication module 132 generates a second indication information indicating that the load valve 200 is in the closed state at this time.

[0041] That is, the above process is only an example of one control logic, and the control logic can be different according to different specific circuits. Ultimately, what is achieved is that the valve state indication module 132 switches its working state according to the output of the valve type selection switch 140, so that the valve state indication module 132 can cooperate with the valve switch module 130 for different load valves 200. In one embodiment, as Figure 6 shown, the controller 120 may include an MCU chip U8 and its peripheral circuits.

[0042] As Figure 4As shown, in one embodiment, the valve switch module 130 includes a relay, a first diode, and a drive switch; a first end of the relay is connected to the power supply module 110, a second end of the relay is connected to the load valve 200, a third end of the relay is connected to an anode of the first diode and a first end of the drive switch, and a fourth end of the relay is connected to a cathode of the first diode and the power supply module 110; a second end of the drive switch is grounded, and a third end of the drive switch is connected to a control level output end of the controller 120.

[0043] As Figure 4 shown, in a specific embodiment, the valve switch module 130 includes a relay K5, a diode D12 (corresponding to the first diode), and a drive switch. Among them, the drive switch generates a corresponding drive level according to the output of the control level output end of the controller 120, and drives the relay K5 to conduct or turn off through this drive level. If the relay K5 is a normally open relay, the drive switch outputs a low level to drive the relay K5 to conduct. If the relay K5 is a normally closed relay, the relay K5 can be driven to turn off by the drive switch outputting a low level. Finally, it can be understood that the drive level is output by the drive switch to maintain the relay K5 in a normally open or normally closed state.

[0044] Optionally, the drive switch includes a triode, a first resistor, and a second resistor; a collector of the triode is connected to a third end of the relay, a base of the triode is connected to a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is connected to the control level output end of the controller 120, and an emitter of the triode and a second end of the second resistor are grounded.

[0045] As Figure 4 shown, in a specific embodiment, the drive switch may include a triode Q12, a resistor R78 (corresponding to the first resistor), and a resistor R77 (corresponding to the second resistor). The control level output end of the controller 120 outputs a control level to control the conduction or turn-off of the triode Q12. When the triode Q12 conducts, the drive switch generates a low level, and when the triode Q12 turns off, the drive switch generates a high level. Finally, it can be understood that the control process of the relay K5 can be realized through the output of the control level output end of the controller 120.

[0046] Optionally, as Figure 5As shown, the valve status indication module 132 includes: a single-pole double-throw switch, a first light-emitting diode, a second light-emitting diode, a third resistor, and a fourth resistor; the input terminal of the single-pole double-throw switch is connected to the control level output terminal of the controller 120, the first output terminal of the single-pole double-throw switch is connected to the anode of the first light-emitting diode, the cathode of the first light-emitting diode is connected to the first end of the third resistor, and the second end of the third resistor is grounded; the second output terminal of the single-pole double-throw switch is connected to the cathode of the second light-emitting diode, the anode of the second light-emitting diode is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the power supply module 110; the control terminal of the single-pole double-throw switch is connected to the valve type selection switch 140. The valve status indication module 132 consists of a single-pole double-throw switch and its peripheral circuit.

[0047] As Figure 5As shown, in a specific embodiment, the valve state indication module 132 includes a single-pole double-throw switch U14, a light-emitting diode LED6 (corresponding to the first light-emitting diode), a light-emitting diode LED14 (corresponding to the second light-emitting diode), a resistor R87 (corresponding to the third resistor), and a resistor R44 (corresponding to the fourth resistor). The input end of the single-pole double-throw switch U14 is connected to the control level output end of the controller 120, and the control end of the single-pole double-throw switch U14 is connected to the valve type selection switch 140. The output level of the valve type selection switch 140 controls the conduction between the input end of the single-pole double-throw switch U14 and one of the first output end and the second output end of the single-pole double-throw switch U14. Since the valve switch module 130 controls its working state through the output level of the control level output end of the controller 120, then, based on the same output level, when the control end level of the single-pole double-throw switch U14 is a known value, there is a corresponding relationship between the output of the single-pole double-throw switch U14 and the working state of the valve switch module 130. The light-emitting diode LED6 is used to indicate the output state of the first output end of the single-pole double-throw switch U14, and the light-emitting diode LED14 is used to indicate the output state of the second output end of the single-pole double-throw switch U14. There is a corresponding relationship between the state indication of the light-emitting diode LED6 and the light-emitting diode LED14 and the working state of the valve switch module 130. Therefore, by setting the control end level of the single-pole double-throw switch U14, a corresponding relationship between the state indication of the light-emitting diode LED6 and the light-emitting diode LED14 and the working state of the valve switch module 130 can be formed. It can also be understood that the working state of the single-pole double-throw switch can be set through the valve type selection switch 140. For example, when the valve switch module 130 is a normally open relay, the valve type selection switch 140 sets the input end of the single-pole double-throw switch to conduct with the second output end. When the control level output end of the controller 120 is at a low level, the valve switch module 130 remains normally open, and the light-emitting diode LED14 emits light corresponding to the normally open state of the valve switch module 130. For example, when the valve switch module 130 is a normally closed relay, the valve type selection switch 140 sets the input end of the single-pole double-throw switch to conduct with the first output end. When the control level output end of the controller 120 is at a high level, the valve switch module 130 remains normally open, and the light-emitting diode LED6 emits light corresponding to the normally open state of the valve switch module 130.

[0048] Optionally, as Figure 6As shown, the valve type selection switch 140 includes a first DIP switch, a fifth resistor, a sixth resistor, and a first capacitor; the first end of the first DIP switch is connected to the first ends of the fifth resistor, the sixth resistor, and the first capacitor; the second end of the fifth resistor is connected to the control level input terminal of the controller 120, the second end of the sixth resistor is connected to the power supply module 110, and the second ends of the first capacitor and the first DIP switch are grounded. Specifically, the valve type selection switch 140 includes a resistor R60 (corresponding to the fifth resistor), a resistor R61 (corresponding to the sixth resistor), a capacitor C9 (corresponding to the first capacitor), and a DIP switch. In an embodiment, the DIP switch is a pair of pins of a DIP switch device. The output level at the control level input terminal of the controller 120 can be pulled high or low through the DIP switch.

[0049] Optionally, as Figure 3 shown, when the number of valve switch modules 130 is multiple, the control circuit further includes an address selection module 150; the controller 120 is connected to the address selection module 150, and is used to receive the input level of the address selection module 150 and switch the output of the control level output terminal of the controller 120. The address information can be set through the address selection module 150, and the controller 120 switches the first controller 120 level output terminal according to the address information.

[0050] Optionally, the address selection module 150 includes a DIP switch group including at least one second DIP switch; the first end of each second DIP switch is respectively connected to a control level input terminal of the controller 120, and the second ends of the second DIP switches are all grounded. As Figure 6 shown, address selection can be achieved through the DIP switch group composed of multiple second DIP switches. In a specific embodiment, the first DIP switch and the second DIP switch are integrated into the same DIP switch group. The DIP switch group may include a DIP switch chip SW1.

[0051] Optionally, the control circuit further includes a connector, and the valve switch module 130 is connected to the load valve 200 through the connector. As Figure 4 shown, in an embodiment, the connector includes a connector J5 and a connector J6; the valve switch module 130 is connected to the load valve 200 through the connector J5 and the connector J6.

[0052] In addition, a heating and ventilation equipment of the present invention includes: a heating and ventilation equipment working circuit, and the control circuit as described above, wherein the control circuit is connected to the heating and ventilation equipment working circuit for controlling the operation of the heating and ventilation equipment working circuit. That is, in the heating and ventilation equipment, the operation of the heating and ventilation equipment working circuit can be controlled by connecting the control circuit to the heating and ventilation equipment working circuit.

[0053] It can be understood that the above embodiments only represent the preferred embodiments of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model; it should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, and these all belong to the protection scope of the present utility model; therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. A control circuit is applied to a heating, ventilation and air conditioning (HVAC) device. The HVAC device includes a load valve, and is characterized in that The control circuit includes: a power supply module for power supply, a controller, a valve switch module corresponding to the load valve, and a valve type selection switch; The valve switch module is connected to the control level output terminal of the controller and is used to open or close the load valve according to the output level of the control level output terminal; The valve type selection switch is connected to the control level input terminal of the controller and is used to generate a status level to switch the output level of the control level output terminal of the controller.

2. The control circuit according to claim 1, wherein, The control circuit further includes a valve status indication module corresponding to the valve switch module; The valve status indication module and the valve switch module are connected to the same control level output terminal of the controller; The valve status indication module is connected to the valve type selection switch and is used to receive the output level of the control level output terminal of the controller and generate indication information according to the output level of the control level output terminal of the controller, and the indication information is used to indicate the working status of the load valve.

3. The control circuit according to claim 1, characterized in that The valve switch module includes a relay, a first diode, and a drive switch; The first end of the relay is connected to the power supply module, the second end of the relay is connected to the load valve, the third end of the relay is connected to the anode of the first diode and the first end of the drive switch, and the fourth end of the relay is connected to the cathode of the first diode and the power supply module; The second end of the drive switch is grounded, and the third end of the drive switch is connected to the control level output terminal of the controller.

4. The control circuit according to claim 3, characterized in that, The drive switch includes a triode, a first resistor, and a second resistor; The collector of the triode is connected to the third end of the relay, the base of the triode is connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is connected to the control level output terminal of the controller, and the emitter of the triode and the second end of the second resistor are grounded.

5. The control circuit according to claim 2, characterized in that, The valve status indication module includes: a single-pole double-throw switch, a first light-emitting diode, a second light-emitting diode, a third resistor, and a fourth resistor; The input terminal of the single-pole double-throw switch is connected to the control level output terminal of the controller, the first output terminal of the single-pole double-throw switch is connected to the anode of the first light-emitting diode, the cathode of the first light-emitting diode is connected to the first end of the third resistor, and the second end of the third resistor is grounded; The second output terminal of the single-pole double-throw switch is connected to the cathode of the second light-emitting diode, the anode of the second light-emitting diode is connected to the first end of the fourth resistor, and the second end of the fourth resistor is connected to the power supply module; The control terminal of the single-pole double-throw switch is connected to the valve type selection switch.

6. The control circuit according to claim 1, characterized in that The valve type selection switch includes a first DIP switch, a fifth resistor, a sixth resistor, and a first capacitor; The first end of the first DIP switch is connected to the first end of the fifth resistor, the first end of the sixth resistor, and the first end of the first capacitor; The second end of the fifth resistor is connected to the control level input terminal of the controller, and the second end of the sixth resistor is connected to the power supply module; The second end of the first capacitor and the second end of the first DIP switch are grounded.

7. The control circuit according to claim 1, wherein When the number of the valve switch modules is multiple, the control circuit further includes an address selection module; The controller is connected to the address selection module and is configured to receive the input level of the address selection module and switch the output of the control level output terminal of the controller.

8. The control circuit according to claim 7, characterized in that, The address selection module includes a DIP switch group including at least one second DIP switch; The first end of each second DIP switch is respectively connected to a control level input terminal of the controller, and the second end of the second DIP switch is grounded.

9. The control circuit according to claim 1, wherein The control circuit further includes a connector, and the valve switch module is connected to the load valve through the connector.

10. A heating, ventilation and air conditioning (HVAC) device, characterized in that, Comprising: A heating, ventilation and air conditioning (HVAC) equipment working circuit, and the control circuit according to any one of claims 1 to 9, wherein the control circuit is connected to the HVAC equipment working circuit and is configured to control the operation of the HVAC equipment working circuit.

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