Interface circuit supporting high-voltage input and low-voltage output

Abstract

The utility model discloses an interface circuit supporting high-voltage input and low-voltage output, which comprises a main control module, a low-voltage module, a self-adaptive module, a dimming module and an input and output interface, and is characterized in that the main control module is electrically connected with the control end of the low-voltage module to control the on-off of an internal circuit of the low-voltage module; the output end of the low-voltage module is electrically connected with the input end of the self-adaptive module, the output end of the self-adaptive module is electrically connected with the input end of the dimming module and the input / output interface, and the output end of the dimming module is electrically connected with the main control module to realize dimming control; when high voltage is input into the input / output interface, the high voltage is respectively input into the dimming module and the adaptive module, and the adaptive module can prevent the high voltage from flowing to the low-voltage module.

Description

Technical Field

[0001] This utility model relates to the field of input / output interface circuit technology, and in particular to an interface circuit that supports high-voltage input and low-voltage output. Background Technology

[0002] When a high-voltage input and a low-voltage output share the same port, the low-voltage output must be turned off before high-voltage input is used; otherwise, the circuit will be damaged and it will be inconvenient to use. Utility Model Content

[0003] The purpose of this invention is to at least solve one of the technical problems existing in the prior art and to provide an interface circuit that supports high voltage input and low voltage output.

[0004] The interface circuit supporting high-voltage input and low-voltage output according to an embodiment of the present invention includes a main control module, a low-voltage module adaptive module, a dimming module, and an input / output interface. The main control module is electrically connected to the control terminal of the low-voltage module to control the on / off state of the internal circuit of the low-voltage module. The output terminal of the low-voltage module is electrically connected to the input terminal of the adaptive module. The output terminal of the adaptive module is electrically connected to the input terminal of the dimming module and the input / output interface, respectively. The output terminal of the dimming module is electrically connected to the main control module to realize dimming control. When the main control module controls the internal circuit of the low-voltage module to be turned on, the low-voltage module outputs low voltage to the input / output interface and the dimming module through the adaptive module, respectively. When the input / output interface inputs high voltage, the high voltage is input to the dimming module and the adaptive module, respectively, and the adaptive module can prevent the high voltage from flowing to the low-voltage module.

[0005] The interface circuit supporting high voltage input and low voltage output according to the embodiment of the present utility model has at least the following beneficial effects: both high voltage input and low voltage output flow through the adaptive module. Since the adaptive module can prevent high voltage from flowing to the low voltage module, it can work normally without shutting down the low voltage module when high voltage input occurs, and there will be no circuit damage problem.

[0006] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0007] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings;

[0008] Figure 1 This is a block diagram of an interface circuit that supports high-voltage input and low-voltage output.

[0009] Figure 2This is a schematic diagram of an interface circuit that supports high-voltage input and low-voltage output. Detailed Implementation

[0010] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0011] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0012] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0013] Reference Figures 1 to 2 This utility model discloses an interface circuit supporting high-voltage input and low-voltage output, including a main control module 10, a low-voltage module 20, an adaptive module 30, a dimming module 40, and an input / output interface 50. The main control module 10 is electrically connected to the control terminal of the low-voltage module 20 to control the on / off state of the internal circuit of the low-voltage module 20. The output terminal of the low-voltage module 20 is electrically connected to the input terminal of the adaptive module 30. The output terminal of the adaptive module 30 is electrically connected to both the input terminal of the dimming module 40 and the input / output interface 50. The output terminal of the dimming module 40 is electrically connected to the main control module 10 to realize dimming control. When the main control module 10 controls the internal circuit of the low-voltage module 20 to be turned on, the low-voltage module 20 outputs low voltage to the input / output interface 50 and the dimming module 40 respectively through the adaptive module 30. When the input / output interface 50 inputs high voltage, the high voltage is input to the dimming module 40 and the adaptive module 30 respectively, and the adaptive module 30 can prevent the high voltage from flowing to the low-voltage module 20.

[0014] Furthermore, the low-voltage module 20 includes a low-voltage output module 21 and a low-voltage constant current module 22. The output terminal of the low-voltage output module 21 is electrically connected to the input terminal of the low-voltage constant current module 22. The main control module 10 is electrically connected to the control terminal of the low-voltage constant current module 22 to control the on / off state of the internal circuit of the low-voltage constant current module 22. The output terminal of the low-voltage constant current module 22 is electrically connected to the input terminal of the adaptive module 30. When the main control module 10 controls the internal circuit of the low-voltage constant current module 22 to be turned on, the low-voltage output module 21 outputs a low voltage to the input / output interface 50 and the dimming module 40 through the low-voltage constant current module 22 and the adaptive module 30, respectively. When the input / output interface 50 inputs a high voltage, the high voltage is input to the dimming module 40 and the adaptive module 30, and the adaptive module 30 prevents the high voltage from flowing to the low-voltage constant current module 22.

[0015] like Figure 2 As shown, the dimming module 40 is a conventional DALI dimming module 40. The adaptive module 30 includes a MOSFET Q1, a transistor Q5, resistors R12, R13, R22, R26, and R27, a diode D7, and a diode D11. One end of resistor R26 and one end of resistor R22 are electrically connected to one input terminal of the dimming module 40 and one end of the input / output interface 50, respectively. The other end of resistor R26 is electrically connected to one output terminal of the low-voltage constant current module 22, one end of resistor R27, and one end of resistor R13, respectively. The other end of resistor R27 is electrically connected to the gate of MOSFET Q1, the anode of diode D11, and the collector of transistor Q5, respectively. The cathode of diode D11 is electrically connected to the other end of resistor R13. The other end of resistor R22 is electrically connected to another input terminal of the dimming module 40, another end of the input / output interface 50, and one end of resistor R12. The other end of resistor R12 is electrically connected to the anode of diode D7. The cathode of diode D7 is electrically connected to the base of transistor Q5 and the drain of MOSFET Q1. The source of MOSFET Q1 is electrically connected to the emitter of transistor Q5 and another output terminal of the low-voltage constant current module 22. When a high voltage is input to the input / output interface 50, the high voltage flows through resistor R12, diode D7, MOSFET Q1, transistor Q5, resistor R27, resistor R26, diode D11, and resistor R13 to form a loop. The current and voltage will not flow to the low-voltage constant current module 22 and the low-voltage output module 21.

[0016] The low-voltage constant current module 22 includes MOSFET Q2, MOSFET Q3, transistor Q4, resistor R28, resistor R15, resistor R16, and diode D9. The anode of diode D9 is electrically connected to the output terminal of the low-voltage output module 21, and the cathode of diode D9 is electrically connected to the other end of resistor R26 and one end of resistor R27. The drain of MOSFET Q2 is electrically connected to the source of MOSFET Q1, and the source of MOSFET Q2 is electrically connected to one end of resistor R28 and the base of transistor Q4. The gate of MOSFET Q2 is electrically connected to the collector of transistor Q4, the drain of MOSFET Q3, and one end of resistor R16. The gate of MOSFET Q3 is electrically connected to one end of resistor R15 and the main control module 10. The other ends of resistor R15 and resistor R16 are electrically connected to the output terminal of the low-voltage output module 21. The emitter of transistor Q4, the source of MOSFET Q3, and the other end of resistor R28 are grounded. The main control module 10 includes a main control chip U1 and an optocoupler U2. The input terminal of the optocoupler U2 is electrically connected to the output terminal of the main control chip U1, and the output terminal of the optocoupler U2 is electrically connected to the gate of the MOSFET Q3. When the main control chip U1 outputs a low level, the optocoupler U2 is turned on, the MOSFET Q3 is turned off, the MOSFET Q2 is turned on, and the MOSFET Q1 is turned on. The low-voltage output module 21 outputs a low voltage to the input / output interface 50 and the dimming module 40 through diode D9, MOSFET Q2, MOSFET Q1, diode D7, resistor R12, and resistor R26. That is, both the high-voltage input and the low-voltage output flow through the adaptive module 30. Since the adaptive module 30 prevents the high voltage from flowing to the low-voltage constant current module 22, the low-voltage output module 21 can work normally without being turned off during high-voltage input, and no circuit damage will occur.

[0017] It will be readily understood by those skilled in the art that the above preferred methods can be freely combined and superimposed without conflict.

[0018] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. An interface circuit supporting high-voltage input and low-voltage output, characterized in that, include: The system comprises a main control module (10), a low-voltage module (20), an adaptive module (30), a dimming module (40), and an input / output interface (50). The main control module (10) is electrically connected to the control terminal of the low-voltage module (20) to control the on / off state of the internal circuit of the low-voltage module (20). The output terminal of the low-voltage module (20) is electrically connected to the input terminal of the adaptive module (30). The output terminal of the adaptive module (30) is electrically connected to the input terminal of the dimming module (40) and the input / output interface (50) respectively. The output terminal of the dimming module (40) is electrically connected to the main control module (10) to achieve dimming control. When the main control module (10) controls the internal circuit of the low-voltage module (20) to be turned on, the low-voltage module (20) outputs low voltage to the input / output interface (50) and the dimming module (40) respectively through the adaptive module (30); when the input / output interface (50) inputs high voltage, the high voltage is input to the dimming module (40) and the adaptive module (30) respectively, and the adaptive module (30) can prevent the high voltage from flowing to the low-voltage module (20).

2. The interface circuit supporting high-voltage input and low-voltage output according to claim 1, characterized in that: The low-voltage module (20) includes a low-voltage output module (21) and a low-voltage constant current module (22). The output terminal of the low-voltage output module (21) is electrically connected to the input terminal of the low-voltage constant current module (22). The main control module (10) is electrically connected to the control terminal of the low-voltage constant current module (22) to control the on / off state of the internal circuit of the low-voltage constant current module (22). The output terminal of the low-voltage constant current module (22) is electrically connected to the input terminal of the adaptive module (30). The main control module (10) controls the input terminal of the low-voltage constant current module (22). When the internal circuit of the low-voltage constant current module (22) is turned on, the low-voltage output module (21) outputs low voltage to the input / output interface (50) and the dimming module (40) through the low-voltage constant current module (22) and the adaptive module (30), respectively; when the input / output interface (50) inputs high voltage, the high voltage is input to the dimming module (40) and the adaptive module (30), and the adaptive module (30) can prevent the high voltage from flowing to the low-voltage constant current module (22).

3. The interface circuit supporting high-voltage input and low-voltage output according to claim 2, characterized in that: The adaptive module (30) includes a MOS transistor Q1, a transistor Q5, resistors R12, R13, R22, R26, R27, diodes D7 and D11. One end of resistor R26 and one end of resistor R22 are electrically connected to one input terminal of the dimming module (40) and one end of the input / output interface (50), respectively. The other end of resistor R26 is electrically connected to one output terminal of the low-voltage constant current module (22), one end of resistor R27, and one end of resistor R13, respectively. The other end of resistor R27 is electrically connected to the gate of MOS transistor Q1, the anode of diode D11, and the collector of transistor Q5, respectively. The cathode of diode D11 is electrically connected to the other end of resistor R13. The other end of resistor R22 is electrically connected to the dimming module (40) and the input / output interface (50), respectively. The other input terminal of the optical module (40), the other end of the input / output interface (50), and one end of the resistor R12 are electrically connected. The other end of the resistor R12 is electrically connected to the anode of the diode D7. The cathode of the diode D7 is electrically connected to the base of the transistor Q5 and the drain of the MOSFET Q1. The source of the MOSFET Q1 is electrically connected to the emitter of the transistor Q5 and the other output terminal of the low-voltage constant current module (22). When the input / output interface (50) receives a high voltage, the high voltage flows through the resistor R12, diode D7, MOSFET Q1, transistor Q5, resistor R27, resistor R26, diode D11, and resistor R13 to form a loop. The current and voltage will not flow to the low-voltage constant current module (22) and the low-voltage output module (21).

4. The interface circuit supporting high-voltage input and low-voltage output according to claim 3, characterized in that: The low-voltage constant current module (22) includes MOSFET Q2, MOSFET Q3, transistor Q4, resistor R28, resistor R15, resistor R16, and diode D9. The anode of diode D9 is electrically connected to the output terminal of the low-voltage output module (21), and the cathode of diode D9 is electrically connected to the other end of resistor R26 and one end of resistor R27. The drain of MOSFET Q2 is electrically connected to the source of MOSFET Q1, and the source of MOSFET Q2 is electrically connected to one end of resistor R28 and one end of resistor R27. The base of transistor Q4 is electrically connected, the gate of MOSFET Q2 is electrically connected to the collector of transistor Q4, the drain of MOSFET Q3 and one end of resistor R16, the gate of MOSFET Q3 is electrically connected to one end of resistor R15 and the main control module (10), the other end of resistor R15 and the other end of resistor R16 are electrically connected to the output terminal of the low voltage output module (21), and the emitter of transistor Q4, the source of MOSFET Q3 and the other end of resistor R28 are grounded.

5. The interface circuit supporting high-voltage input and low-voltage output according to claim 4, characterized in that: The main control module (10) includes a main control chip U1 and an optocoupler U2. The input terminal of the optocoupler U2 is electrically connected to the output terminal of the main control chip U1, and the output terminal of the optocoupler U2 is electrically connected to the gate of the MOS transistor Q3. When the main control chip U1 outputs a low level, the optocoupler U2 is turned on, the MOS transistor Q3 is turned off, the MOS transistor Q2 is turned on, and the MOS transistor Q1 is turned on. The low voltage output module (21) outputs a low voltage to the input / output interface (50) and the dimming module (40) through diode D9, MOS transistor Q2, MOS transistor Q1, diode D7, resistor R12, and resistor R26.

6. The interface circuit supporting high-voltage input and low-voltage output according to claim 1, characterized in that: The dimming module (40) includes a DALI dimming module (40).

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