DC intelligent switch structure

Abstract

The utility model relates to a direct-current intelligent switch structure, which comprises a power supply module electrically connected with a bus communication module, a processor module and a relay driving module respectively, and the power supply module is used for converting an input direct-current voltage into a voltage level suitable for each module; the bus communication module is electrically connected with the processor module and performs two-way transmission with the processor module; the bus communication module is used for establishing a plurality of intelligent control nodes; the processor module is electrically connected with the relay driving module, and the processor module is used for processing a signal sent by the bus communication module and controlling the on-off of the relay driving module; the relay driving module and the direct-current follow current cut-off circuit module are in bidirectional connection, and the direct-current follow current cut-off circuit module is used for controlling the on-off of a relay according to a signal of the relay driving module and providing follow current protection for the relay. According to the utility model, the circuit design is accurate, the power supply management strategy is efficient, rapid adjustment can be carried out according to actual demands, and higher intelligentization and automation level can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of direct current circuit relay control, in particular to a direct current intelligent switch structure. Background Art

[0002] With the development of Internet of Things technology, the demand for intelligent LED control is growing, but in actual application, it still faces many problems in terms of stability, intelligence, cost, and humanized control. Through the application analysis of existing DC switch modules, the following problems exist:

[0003] 1. The mechanical relays commonly used in the current market can work stably as long as the rated current is not exceeded, but they require manual control, which limits their use in application scenarios that require high automation.

[0004] 2. The DC switch module generally includes a switching power supply, a bus communication circuit, a processor circuit, and a mechanical circuit. There is a lack of effective linkage control mechanism between the components, and they cannot work in duplex mode, which limits the flexibility and reliability of the system.

[0005] 3. Although the current control method has partially realized access control through intelligent terminals, compared with traditional control methods, the intelligence level and timeliness of control are still limited. Utility Model Content

[0006] In order to solve the problems existing in the above-mentioned prior art, the purpose of the utility model is to provide a DC intelligent switch structure. The utility model not only has accurate circuit design and efficient power management strategy, but also enables the structure to be quickly adjusted according to actual needs, achieving a higher level of intelligence and automation. The DC freewheeling cut-off circuit module also provides freewheeling protection for the relay, meeting the high standard requirements of modern smart home and Internet of Things technology.

[0007] The utility model discloses a DC intelligent switch structure, comprising a power supply module, a bus communication module, a processor module, a relay drive module and a DC freewheeling cut-off circuit module.

[0008] The power supply module is electrically connected to the bus communication module, the processor module and the relay driving module respectively, and the power supply module is used to convert the input DC voltage into a voltage level suitable for each module;

[0009] The bus communication module is electrically connected to the processor module and performs bidirectional transmission, and the bus communication module is used to establish a plurality of intelligent control nodes;

[0010] The processor module is electrically connected to the relay driving module, and the processor module is used to process the signal sent by the bus communication module and control the on and off of the relay driving module;

[0011] The relay driving module and the DC freewheeling cut-off circuit module are bidirectionally connected. The DC freewheeling cut-off circuit module is used to control the on and off of the relay according to the signal of the relay driving module and provide freewheeling protection for the relay.

[0012] In one embodiment, the relay includes a relay switch and a gate switch, and the DC freewheeling cut-off circuit module includes a resistor R5, a resistor R4 and a resistor R1 connected in series from the positive pole to the negative pole of the DC voltage, and the input pin 6 of the gate switch is connected between the resistor R4 and the resistor R1, and the resistor R4 and the resistor R1 are also connected to the base of the transistor Q1 through a resistor R42, the collector of the transistor Q1 is connected to the input pin 4 of the gate switch, and the collector of the transistor Q1 is also connected to the other positive pole of the DC voltage through the load U2, and the emitter of the transistor Q1 is respectively connected to the negative pole of the DC voltage and the output pin 3 of the gate switch, and a freewheeling diode D12 is also connected in parallel at both ends of the load U2.

[0013] In one embodiment, the relay driver module is a relay driver chip with model number UDN2981A.

[0014] In one embodiment, the relay switch includes a pin 5 and a pin 1 and a pin 2 electrically connected to the pin 5 respectively, the voltage applied to the pin 5 is 12V, the pin 1 is electrically connected to the pin 18 of the relay driving module, and the pin 2 is electrically connected to the pin 17 of the relay driving module.

[0015] In one embodiment, the power supply module is a full-bridge DC-DC isolated regulated power supply composed of a model NCS6S1205C and a model BEI 15-150-Q12.

[0016] In one embodiment, the processor module is a 32-bit processor of model STM32F103.

[0017] Compared with the prior art, the beneficial effects of the technical solution of the utility model are:

[0018] 1. The utility model establishes multiple nodes to connect external intelligent control through the bus communication module, and then through the data processing of the processor module, the relay drive module and the DC freewheeling cut-off circuit module can receive instructions from the central control unit or other external devices, so as to realize intelligent management. It not only has accurate circuit design and efficient power management strategy, but also enables the structure to be quickly adjusted according to actual needs, so as to realize a higher level of intelligence and automation. The DC freewheeling cut-off circuit module also provides freewheeling protection for the relay, so as to meet the high standard requirements of modern smart home and Internet of Things technology.

[0019] 2. The DC freewheeling cut-off circuit module of the utility model ensures that both power supply and power failure can be carried out smoothly and effectively, avoiding possible electrical shocks to the equipment; adding a zero-crossing cut-off circuit to the DC freewheeling cut-off circuit module is mainly to cut off the power supply when the current is zero, reduce the loss of electrical equipment, extend the service life of the equipment, and ensure switching at the safest point of the current waveform, thereby reducing arcs and voltage spikes caused by cutting off the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a connection diagram of a DC intelligent switch structure of the utility model;

[0021] Figure 2 It is a circuit diagram of the relay drive module of the utility model;

[0022] Figure 3 The utility model is a circuit diagram of a DC freewheeling cut-off circuit module. DETAILED DESCRIPTION

[0023] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, which can be said to be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and embodiments.

[0025] like Figure 1-Figure 3As shown, a DC intelligent switch structure of the utility model includes a power supply module, a bus communication module, a processor module, a relay drive module U28 and a DC freewheeling cut-off circuit module.

[0026] The power supply module is electrically connected to the bus communication module, the processor module and the relay drive module U28 respectively, and the power supply module is used to convert the input DC voltage into a voltage level suitable for each module;

[0027] The bus communication module is electrically connected to the processor module and transmits data bidirectionally. The bus communication module is used to establish multiple intelligent control nodes.

[0028] The processor module is electrically connected to the relay drive module U28, and the processor module is used to process the signal sent by the bus communication module and control the on and off of the relay drive module U28;

[0029] The relay driving module U28 and the DC freewheeling cut-off circuit module are bidirectionally connected. The DC freewheeling cut-off circuit module is used to control the on and off of the relay U4 according to the signal of the relay driving module U28 and provide freewheeling protection for the relay U4.

[0030] The utility model establishes multiple nodes to connect to external intelligent control through a bus communication module. The bus communication module is CAN bus communication hardware, adopts a CAN bus driver of model TJA1050T, and has a built-in CAN bus protocol controller. As long as an external bus driver chip and an appropriate anti-interference circuit are connected, multiple CAN bus intelligent measurement and control nodes can be easily established. Then, this structure processes the data through the processor module, so that the relay drive module and the DC freewheeling cut-off circuit module can receive instructions from the central control unit or other external devices to achieve intelligent management. Not only accurate circuit design and efficient power management strategy, but also enables this structure to be quickly adjusted according to actual needs to achieve a higher level of intelligence and automation. The DC freewheeling cut-off circuit module also provides freewheeling protection for the relay to meet the high standard requirements of modern smart home and Internet of Things technology.

[0031] In one embodiment, the relay U4 includes a relay switch and a gate switch, and the DC freewheeling cut-off circuit module includes a resistor R5, a resistor R4 and a resistor R1 connected in series from the positive pole to the negative pole of the DC voltage, and the input pin 6 of the gate switch is connected between the resistor R4 and the resistor R1, and the resistor R4 and the resistor R1 are also connected to the base of the transistor Q1 through the resistor R42, the collector of the transistor Q1 is connected to the input pin 4 of the gate switch, and the collector of the transistor Q1 is also connected to the other positive pole of the DC voltage through the load U2, and the emitter of the transistor Q1 is respectively connected to the negative pole of the DC voltage and the output pin 3 of the gate switch, and a freewheeling diode D12 is also connected in parallel at both ends of the load U2. The DC freewheeling cut-off circuit module of the utility model ensures that both power supply and power failure can be carried out smoothly and effectively, avoiding possible electrical shocks to the equipment; adding a zero-crossing cut-off circuit to the DC freewheeling cut-off circuit module is mainly to cut off the power supply when the current is zero, reduce the loss of electrical equipment, extend the service life of the equipment, ensure switching at the safest point of the current waveform, thereby reducing arcs and voltage spikes caused by cutting off the power supply.

[0032] Relay U4 is a 20A relay device. DC+ and DC- are the DC power supply input voltages. The power supply voltage is divided by resistors R4, R5, and R1 and connected to pin 6 of relay U4, and connected to one end of resistor R42. After passing through resistor R42, it is connected to the base of transistor Q1 to realize the function of driving transistor Q1. Transistor Q1 is a high-power high-voltage transistor, which is used as a semiconductor freewheeling tube here; pin 3 of relay U4 is respectively connected to the emitter of transistor Q1 and the negative electrode DC- of the input voltage, and pin 4 is connected to the collector of transistor Q1, and then connected to one end of load U2. The other end of load U2 is connected to the positive electrode DC+ of the power supply to form a loop to drive the load; freewheeling diode D12 plays the role of freewheeling and protecting transistor Q1 and the load. Generally speaking, when the relay is turned on and off, the large current cannot be fully released. Therefore, due to the existence of transistor Q1, when the relay switch in relay U4 receives the signal control of the relay driver module U28 to turn on, the input pin 4 of the selection switch is connected with the output pin 3, and the relay is regarded as turned on. The base of transistor Q1 is at a high potential, and the collector and emitter are connected. At this time, since transistor Q1 is turned on first and the relay coil is closed later, the current will pass through transistor Q1 first. When the relay coil is fully closed, the current will pass through the relay. In this way, due to the buffering of transistor Q1, the Circuit; When the relay switch receives the signal from the relay driver module U28 to be controlled to be closed, the input pin 6 and the output pin 3 of the selection switch are connected to form a short circuit, and the base of the transistor Q1 is no longer at a high potential, and the collector and the emitter are open. At this time, the large current of the relay coil cannot be released immediately. When the relay coil is disconnected, since it is disconnected first and the transistor Q1 is opened at the back end, at the moment the relay is disconnected, the large current is released by the transistor Q1 for continuous flow until the transistor Q1 is completely disconnected, thereby realizing the function of completely cutting off the DC continuous flow, and well protecting the relay coil and load circuits.

[0033] Further, the relay driver module U28 is a relay driver chip of model UDN2981A. Pins 1 and 2 of the chip are respectively connected to the pins MCU_ON and MCU_OFF of the processor module, and MCU_ON and MCU_OFF are any two GPIO ports of the processor module, thereby realizing the function of the processor module controlling the relay driver module U28. In addition, the relay switch includes pin 5 and pins 1 and 2 electrically connected to pin 5, respectively, the voltage applied to pin 5 is 12V, pin 1 is electrically connected to pin 18 of the relay driver module, and pin 2 is electrically connected to pin 17 of the relay driver module. Pins 17 and 18 of the relay driver module U28 represent the ON and OFF of the relay U4 respectively, and are therefore electrically connected to pins 1 and 2 of the relay switch respectively. When ON is grounded and OFF is suspended with high impedance, pins 1 and 5 of the relay switch are turned on, and at the same time, the input pin 4 and output pin 3 of the above-mentioned selection switch are turned on, which is regarded as the relay being turned on; when ON is suspended with high impedance and OFF is grounded, pins 2 and 5 of the relay switch are turned on, and at the same time, the input pin 6 and output pin 3 of the above-mentioned selection switch are turned on, which is regarded as the relay being turned off.

[0034] In one embodiment, the power module is a full-bridge DC-DC isolated regulated power supply composed of a model NCS6S1205C and a model BEI 15-150-Q12. The NCS6S1205C output is a single power supply, and the BEI 15-150-Q12 output is two power supplies. The combination achieves the function of three-way output, which respectively corresponds to the bus communication module, the processor module and the relay drive module U28, and can adjust the input DC voltage to the applicable voltage level as needed. The processor module is a 32-bit processor of model STM32F103. The 32-bit processor provides powerful computing power and can handle complex algorithms and large amounts of data, so that it can seamlessly connect with the actuators of other connected modules.

[0035] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application.

[0036] In the figure, the description of the positional relationship is only for illustrative purposes and cannot be understood as a limitation of this patent; obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model, and are not limitations on the implementation methods of the utility model. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the scope of protection of the claims of the utility model.

Claims

1. A DC intelligent switch structure, characterized in that: It includes a power supply module, a bus communication module, a processor module, a relay drive module and a DC freewheeling cut-off circuit module. The power supply module is electrically connected to the bus communication module, the processor module and the relay driving module respectively, and the power supply module is used to convert the input DC voltage into a voltage level suitable for each module; The bus communication module is electrically connected to the processor module and performs bidirectional transmission, and the bus communication module is used to establish a plurality of intelligent control nodes; The processor module is electrically connected to the relay driving module, and the processor module is used to process the signal sent by the bus communication module and control the on and off of the relay driving module; The relay driving module and the DC freewheeling cut-off circuit module are bidirectionally connected. The DC freewheeling cut-off circuit module is used to control the on and off of the relay according to the signal of the relay driving module and provide freewheeling protection for the relay.

2. A DC intelligent switch structure according to claim 1, characterized in that: The relay includes a relay switch and a gate switch, the DC freewheeling cut-off circuit module includes a resistor R5, a resistor R4 and a resistor R1 which are connected in series from the positive pole to the negative pole of the DC voltage, the input pin 6 of the gate switch is connected between the resistor R4 and the resistor R1, and the resistor R4 and the resistor R1 are also connected to the base of the transistor Q1 through a resistor R42, the collector of the transistor Q1 is connected to the input pin 4 of the gate switch, the collector of the transistor Q1 is also connected to the other positive pole of the DC voltage through a load U2, the emitter of the transistor Q1 is respectively connected to the negative pole of the DC voltage and the output pin 3 of the gate switch, and a freewheeling diode D12 is also connected in parallel at both ends of the load U2.

3. A DC intelligent switch structure according to claim 2, characterized in that: The relay driver module is a relay driver chip with model number UDN2981A.

4. A DC intelligent switch structure according to claim 3, characterized in that: The relay switch includes a pin 5 and a pin 1 and a pin 2 electrically connected to the pin 5 respectively. The voltage applied to the pin 5 is 12V. The pin 1 is electrically connected to the pin 18 of the relay driving module, and the pin 2 is electrically connected to the pin 17 of the relay driving module.

5. A DC intelligent switch structure according to claim 1, characterized in that: The power supply module is a full-bridge DC-DC isolated regulated power supply composed of a NCS6S1205C model and a BEI 15-150-Q12 model.

6. A DC intelligent switch structure according to claim 1, characterized in that: The processor module is a 32-bit processor of model STM32F103.

Images