Three-in-one dimming device for LED driver and dimming method of three-in-one dimming device

Abstract

The invention provides a three-in-one dimming device for an LED driver and a dimming method of the three-in-one dimming device. The LED driver with a single dimming mode can be upgraded into the LED driver with multiple dimming modes of 0-10V analog signal dimming, DALI dimming and DMX dimming at low cost. The analog dimming circuit, the DMX transceiver circuit and the DALI transceiver circuit are all connected with the single-chip microcomputer. The dimming interface I is respectively connected with the analog dimming circuit, the interface protection circuit and the DALI transceiver circuit; the second dimming interface is connected with the analog dimming circuit, the interface protection circuit and the DALI transceiver circuit, and is connected with the grounding port through the on-off circuit. The on-off circuit is connected with the single-chip microcomputer. The interface protection circuit is also connected with the interface overvoltage detection circuit, the DMX transmit-receive circuit and the single-chip microcomputer. The interface overvoltage detection circuit is connected with the interface protection circuit, the first dimming interface and the second dimming interface.

Description

Technical Field

[0001] The present invention relates to a three-in-one dimming device for an LED driver and a dimming method thereof. Background Art

[0002] The mainstream dimming technologies of existing LEDs are 0-10V analog signal dimming, DALI dimming, and DMX dimming. They each have their own advantages, and the signal voltage levels vary greatly. Generally, an LED driver has only one dimming interface, which will result in a single product and difficult customer selection. There are also some brands that integrate multiple dimming interfaces into one LED driver. However, multiple dimming interfaces will use different interfaces respectively, which will lead to too many lead wires of the product and make it easy for customers to connect the wires wrongly. The wrong wiring will also cause damage to the LED driver.

[0003] Chinese Patent Publication No. CN119967666A discloses a three-in-one dimming interface automatic recognition system and method, which uses an analog strobe chip to achieve automatic recognition of 0-10V analog signal dimming, DALI, and DMX. However, in fact, due to the high level of DALI dimming reaching 22.5V, while the working voltage of a conventional analog strobe chip does not exceed 20V, analog strobe chips that can adapt to such high voltages are rare, very scarce, and extremely expensive. Summary of the Invention

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, and to provide a three-in-one dimming device for an LED driver and a dimming method thereof with a reasonable structural design, which can upgrade an LED driver with a single dimming mode to an LED driver with multiple dimming modes including 0-10V analog signal dimming, DALI dimming, and DMX dimming at a relatively low cost.

[0005] The technical solution adopted by the present invention to solve the above problems is: a three-in-one dimming device for an LED driver, including a first dimming interface, a second dimming interface, a ground port, an analog dimming circuit, a DMX transceiver circuit, and a DALI transceiver circuit; characterized in that: it further includes a switching circuit, an interface protection circuit, an interface overvoltage detection circuit, and a single-chip microcomputer; the analog dimming circuit, the DMX transceiver circuit, and the DALI transceiver circuit are all connected to the single-chip microcomputer; the first dimming interface is respectively connected to the analog dimming circuit, the interface protection circuit, and the DALI transceiver circuit; the second dimming interface is respectively connected to the analog dimming circuit, the interface protection circuit, and the DALI transceiver circuit, and is connected to the ground port through the switching circuit; the switching circuit is connected to the single-chip microcomputer; the interface protection circuit is further respectively connected to the interface overvoltage detection circuit, the DMX transceiver circuit, and the single-chip microcomputer; the interface overvoltage detection circuit is connected to the interface protection circuit, the first dimming interface, and the second dimming interface.

[0006] The present invention further includes an NFC chip, which is connected to the single-chip microcomputer, and the dimming mode of the single-chip microcomputer MCU is set to an analog signal dimming mode, a DMX dimming mode, or a DALI dimming mode through the NFC chip.

[0007] The present invention further includes an isolation circuit, and the single-chip microcomputer is connected to the LED driver through the isolation circuit.

[0008] The DMX transceiver circuit of the present invention uses an RS485 transceiver chip.

[0009] The present invention further includes a rectifier bridge; both the dimming interface one and the dimming interface two are connected to the DALI transceiver circuit through the rectifier bridge, and the interface overvoltage detection circuit is connected to the dimming interface one and the dimming interface two through the rectifier bridge.

[0010] The rectifier bridge and the interface overvoltage detection circuit of the present invention are both connected to the ground port.

[0011] A dimming method for a three-in-one dimming device for an LED driver, characterized by including the following modes: (1) Analog signal dimming mode: The dimming interface one and the dimming interface two are externally connected to an analog dimming controller; The dimming mode of the single-chip microcomputer is set to the analog signal dimming mode, the single-chip microcomputer controls the on-off circuit to conduct, and shorts the dimming interface two and the ground port; the single-chip microcomputer controls the analog dimming circuit to be enabled, and the DMX transceiver circuit and the DALI transceiver circuit are not enabled; the analog dimming circuit converts the analog dimming signals sent into the dimming interface one and the dimming interface two into signals recognizable by the single-chip microcomputer, and the single-chip microcomputer then converts the signals into signals required by the LED driver and transmits the signals to the LED driver; (2) DMX dimming mode: The dimming interface one and the dimming interface two are externally connected to a DMX dimming controller; The dimming mode of the single-chip microcomputer MCU is set to the DMX dimming mode, the single-chip microcomputer MCU controls the on-off circuit to turn off, and at the same time controls the DMX transceiver circuit to be enabled, the analog dimming circuit, the DALI transceiver circuit, and the interface protection circuit are not enabled, the DMX transceiver circuit is directly connected to the dimming interface one and the dimming interface two, and the single-chip microcomputer MCU converts the DMX signals transmitted by the DMX transceiver circuit into signals required by the LED driver and transmits the signals to the LED driver; In this dimming mode, the interface protection circuit is not enabled, and the interface overvoltage detection circuit judges the dimming signals of the dimming interface one and the dimming interface two. If the dimming interface one and the dimming interface two are misconnected with DALI signals, the interface overvoltage detection circuit detects that the voltage is higher than the given threshold, enables the interface protection circuit, and the interface protection circuit acts to disconnect the DMX transceiver circuit from the dimming interface one and the dimming interface two to prevent the DMX transceiver circuit from being damaged by overvoltage; (3) DALI Dimming Mode: The dimming interface 1 and the dimming interface 2 are externally connected to a DALI dimming controller. Set the dimming mode of the single-chip microcomputer to the DALI dimming mode. The single-chip microcomputer controls the on-off circuit to turn off, and at the same time controls the DALI transceiver circuit to be enabled, while the analog dimming circuit and the DMX transceiver circuit are not enabled. The DALI transceiver circuit is connected to the dimming interface 1 and the dimming interface 2. The single-chip microcomputer converts the DALI signal transmitted by the DALI transceiver circuit into the signal required by the LED driver and transmits the signal to the LED driver.

[0012] In the analog signal dimming mode and the DALI dimming mode of the present invention, the interface protection circuit is enabled under the control of the single-chip microcomputer, and the DMX transceiver circuit is disconnected from the dimming interface 1 and the dimming interface 2, and the DMX transceiver circuit is not enabled.

[0013] Compared with the prior art, the present invention has the following advantages and effects: (1) The Chinese patent with the publication number CN119967666A only identifies the interface, while the present patent identifies different dimming signals and converts the signals into the signals required for the LED driver to dim.

[0014] (2) The present patent does not require an analog strobe chip and can upgrade the LED driver with a single dimming mode to an LED driver with multiple dimming modes including 0-10V analog signal dimming, DALI dimming, and DMX dimming at a relatively low cost. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the connection between the embodiment of the present invention and an analog dimming controller.

[0017] Figure 3 It is a schematic structural diagram of the connection between the embodiment of the present invention and a DMX dimming controller.

[0018] Figure 4 It is a schematic structural diagram of the connection between the embodiment of the present invention and a DALI dimming controller. Detailed Embodiments

[0019] The present invention will be further described in detail below with reference to the drawings and through embodiments. The following embodiments are explanations of the present invention and the present invention is not limited to the following embodiments.

[0020] See Figure 1, the three-in-one dimming device for an LED driver in this embodiment includes a dimming interface 101, a dimming interface 102, a ground port 103, a switching circuit 104, an interface protection circuit 105, an interface overvoltage detection circuit 106, a rectifier bridge 107, an analog dimming circuit 108, a DMX transceiver circuit 109, a DALI transceiver circuit 110, an NFC chip 112, a single-chip microcomputer MCU, and an isolation circuit 113.

[0021] The analog dimming circuit 108, the DMX transceiver circuit 109, the DALI transceiver circuit 110, and the NFC chip 112 are all connected to the single-chip microcomputer MCU. The dimming mode of the single-chip microcomputer MCU is set to an analog signal dimming mode, a DMX dimming mode, or a DALI dimming mode through the NFC chip 112. The single-chip microcomputer MCU is connected to the dimming control circuit 114 of the LED driver through the isolation circuit 113. The single-chip microcomputer MCU converts an external 0-10V, DMX, or DALI dimming signal into a signal required by the LED driver and transmits the signal to the dimming control circuit 114 of the LED driver through the isolation circuit 113.

[0022] The dimming interface 101 is respectively connected to the analog dimming circuit 108, the interface protection circuit 105, and the DALI transceiver circuit 110. The dimming interface 102 is respectively connected to the analog dimming circuit 108, the interface protection circuit 105, and the DALI transceiver circuit 110, and is connected to the ground port 103 through the switching circuit 104. Among them, both the dimming interface 101 and the dimming interface 102 are connected to the DALI transceiver circuit 110 through the rectifier bridge 107. The voltage signals of the dimming interface 101 and the dimming interface 102 are rectified by the rectifier bridge 107 and then transmitted to the DALI transceiver circuit 110. The switching circuit 104 is connected to the single-chip microcomputer MCU.

[0023] The interface protection circuit 105 is also respectively connected to the interface overvoltage detection circuit 106, the DMX transceiver circuit 109, and the single-chip microcomputer MCU. The interface overvoltage detection circuit 106 is connected to the interface protection circuit 105 and is connected to the dimming interface 101 and the dimming interface 102 through the rectifier bridge 107. After the dimming signals applied to the dimming interface 101 and the dimming interface 102 are rectified by the rectifier bridge 107, they are detected by the interface overvoltage detection circuit 106. If the interface voltage is greater than the set value, the interface protection circuit 105 is enabled to disconnect the DMX transceiver circuit 109 from the dimming interface 101 and the dimming interface 102 to avoid overvoltage damage to the DMX transceiver circuit 109.

[0024] The DMX transceiver circuit 109 uses an RS485 transceiver chip.

[0025] The dimming method of the embodiment of the present invention includes the following modes: (1) Analog signal dimming mode: See Figure 2 , the dimming interface 101 and the dimming interface 202 are externally connected to a 0-10V analog dimming controller.

[0026] The dimming mode of the single-chip microcomputer MCU is set to the analog signal dimming mode through the NFC chip 112. The single-chip microcomputer MCU controls the on-off circuit 104 to conduct, short-circuiting the dimming interface 202 and the ground port 103; the single-chip microcomputer MCU controls the analog dimming circuit 108 to be enabled, and the DMX transceiver circuit 109 and the DALI transceiver circuit 110 are not enabled; the analog dimming circuit 108 converts the 0-10V analog dimming signal sent by the dimming interface 101 and the dimming interface 202 into a 0-3.3V signal recognizable by the single-chip microcomputer MCU, and the single-chip microcomputer MCU then converts the 0-3.3V signal into the signal required by the LED driver, and transmits the signal to the dimming control circuit 114 of the LED driver through the isolation circuit 113.

[0027] (2) DMX dimming mode: See Figure 3 , the dimming interface 101 and the dimming interface 202 are externally connected to a DMX dimming controller.

[0028] The dimming mode of the single-chip microcomputer MCU is set to the DMX dimming mode through the NFC chip 112. The single-chip microcomputer MCU controls the on-off circuit 104 to turn off; the single-chip microcomputer MCU controls the DMX transceiver circuit 109 to be enabled, the analog dimming circuit 108 and the DALI transceiver circuit 110 are not enabled, and controls the interface protection circuit 105 not to be enabled. The input end of the DMX transceiver circuit 109 is directly connected to the dimming interface 101 and the dimming interface 202. The single-chip microcomputer MCU converts the DMX signal transmitted by the DMX transceiver circuit 109 into the signal required by the LED driver, and transmits the signal to the dimming control circuit 114 of the LED driver through the isolation circuit 113.

[0029] In this dimming mode, the interface protection circuit 105 is not enabled. The interface overvoltage detection circuit 106 judges the voltage after rectification by the rectifier bridge 107 input by the dimming interface 101 and the dimming interface 202. If the DALI signal is misconnected to the dimming interface 101 and the dimming interface 202, since the DALI signal level is as high as 22.5V, when the interface overvoltage detection circuit 106 detects that the voltage is higher than the given threshold, the interface protection circuit 105 is enabled, and the interface protection circuit 105 acts to disconnect the DMX transceiver circuit 109 from the dimming interface 101 and the dimming interface 202, preventing the DMX transceiver circuit 109 from being damaged by overvoltage.

[0030] (3) DALI dimming mode: See Figure 4, the dimming interface one 101 and the dimming interface two 102 are externally connected to a DALI dimming controller.

[0031] The dimming mode of the single-chip microcomputer MCU is set to the DALI dimming mode through the NFC chip 112, and the single-chip microcomputer MCU controls the on-off circuit 104 to turn off; the single-chip microcomputer MCU controls the DALI transceiver circuit 110 to be enabled, and the analog dimming circuit 108 and the DMX transceiver circuit 109 are not enabled; the DALI transceiver circuit 110 is connected to the dimming interface one 101 and the dimming interface two 102 through the rectifier bridge 107. The single-chip microcomputer MCU converts the DALI signal transmitted by the DALI transceiver circuit 110 into a signal required by the LED driver, and transmits the signal to the dimming control circuit 114 of the LED driver through the isolation circuit 113.

[0032] (4) In the analog signal dimming mode and the DALI dimming mode, the interface protection circuit 105 is enabled under the control of the single-chip microcomputer MCU, the DMX transceiver circuit 109 is disconnected from the dimming interface one 101 and the dimming interface two 102, and the DMX transceiver circuit 109 is not enabled.

[0033] In addition, it should be noted that for the specific embodiments described in this specification, the shapes, names of the components, etc. can be different. The above content described in this specification is only an example of the structure of the present invention. Any equivalent changes or simple changes made according to the structure, features and principles of the present invention are included in the protection scope of the present invention. Those skilled in the art of the present invention can make various modifications or supplements to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined by this claim, they should fall within the protection scope of the present invention.

Claims

1. A three-in-one dimming device for an LED driver, comprising a dimming interface one, a dimming interface two, a ground port, an analog dimming circuit, a DMX transceiver circuit, and a DALI transceiver circuit; characterized in that: It also includes a switching circuit, an interface protection circuit, an interface overvoltage detection circuit and a single-chip microcomputer; the analog dimming circuit, the DMX transceiver circuit and the DALI transceiver circuit are all connected to the single-chip microcomputer; the first dimming interface is respectively connected to the analog dimming circuit, the interface protection circuit and the DALI transceiver circuit; the second dimming interface is respectively connected to the analog dimming circuit, the interface protection circuit and the DALI transceiver circuit, and is connected to the ground port through the switching circuit; the switching circuit is connected to the single-chip microcomputer; the interface protection circuit is also respectively connected to the interface overvoltage detection circuit, the DMX transceiver circuit and the single-chip microcomputer; the interface overvoltage detection circuit is connected to the interface protection circuit, the first dimming interface and the second dimming interface.

2. The three-in-one dimming device for an LED driver according to claim 1, wherein: It also includes an NFC chip, the NFC chip is connected to the single-chip microcomputer, and the dimming mode of the single-chip microcomputer MCU is set to the analog signal dimming mode, the DMX dimming mode or the DALI dimming mode through the NFC chip.

3. The three-in-one dimming device for an LED driver according to claim 1, characterized in that: It also includes an isolation circuit, and the single-chip microcomputer is connected to the LED driver through the isolation circuit.

4. The three-in-one dimming device for an LED driver according to claim 1, characterized in that: The DMX transceiver circuit adopts an RS485 transceiver chip.

5. The three-in-one dimming device for an LED driver according to claim 1, characterized in that: It also includes a rectifier bridge; the first dimming interface and the second dimming interface are both connected to the DALI transceiver circuit through the rectifier bridge, and the interface overvoltage detection circuit is connected to the first dimming interface and the second dimming interface through the rectifier bridge.

6. The three-in-one dimming device for an LED driver according to claim 5, characterized in that: The rectifier bridge and the interface overvoltage detection circuit are both connected to the ground port.

7. A dimming method for the three-in-one dimming device for an LED driver according to any one of claims 1-6, characterized in that: It includes the following modes: (1) Analog signal dimming mode: The first dimming interface and the second dimming interface are externally connected to an analog dimming controller; Set the dimming mode of the single-chip microcomputer to the analog signal dimming mode, the single-chip microcomputer controls the switching circuit to conduct, and shorts the second dimming interface and the ground port; the single-chip microcomputer controls the analog dimming circuit to be enabled, and the DMX transceiver circuit and the DALI transceiver circuit are not enabled; the analog dimming circuit converts the analog dimming signals sent into the first dimming interface and the second dimming interface into signals recognizable by the single-chip microcomputer, and the single-chip microcomputer then converts the signals into signals required by the LED driver and transmits the signals to the LED driver; (2) DMX dimming mode: The first dimming interface and the second dimming interface are externally connected to a DMX dimming controller; Set the dimming mode of the single-chip microcomputer MCU to the DMX dimming mode, the single-chip microcomputer MCU controls the switching circuit to turn off, and at the same time controls the DMX transceiver circuit to be enabled, the analog dimming circuit, the DALI transceiver circuit and the interface protection circuit are not enabled, the DMX transceiver circuit is directly connected to the first dimming interface and the second dimming interface, and the single-chip microcomputer MCU converts the DMX signals transmitted by the DMX transceiver circuit into signals required by the LED driver and transmits the signals to the LED driver; In this dimming mode, the interface protection circuit is not enabled, and the interface overvoltage detection circuit judges the dimming signals of the first dimming interface and the second dimming interface. If the first dimming interface and the second dimming interface are misconnected with DALI signals, the interface overvoltage detection circuit detects that the voltage is higher than the given threshold, enables the interface protection circuit, and the interface protection circuit acts to disconnect the DMX transceiver circuit from the first dimming interface and the second dimming interface to prevent the DMX transceiver circuit from being damaged by overvoltage; (3) DALI dimming mode: The first dimming interface and the second dimming interface are externally connected to a DALI dimming controller; Set the dimming mode of the single-chip microcomputer to the DALI dimming mode. The single-chip microcomputer controls the on-off circuit to turn off, and at the same time controls the DALI transceiver circuit to be enabled, while the analog dimming circuit and the DMX transceiver circuit are not enabled. The DALI transceiver circuit is connected to dimming interface one and dimming interface two. The single-chip microcomputer converts the DALI signal transmitted by the DALI transceiver circuit into the signal required by the LED driver and transmits the signal to the LED driver.

8. The dimming method according to claim 7, wherein: In the analog signal dimming mode and the DALI dimming mode, the interface protection circuit is enabled under the control of the single-chip microcomputer, and the DMX transceiver circuit is disconnected from dimming interface one and dimming interface two, and the DMX transceiver circuit is not enabled.

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