Dimming switching function circuit

Abstract

The utility model discloses a dimming switching function circuit, which comprises a rectifying and filtering circuit, a power conversion circuit, an LED driving circuit, a dimming signal processing circuit and a dimming and non-dimming switching circuit, the rectifying and filtering circuit is electrically connected with the input end of the LED driving circuit through the power conversion circuit, and the output end of the LED driving circuit is connected with an LED. And the dimming and non-dimming switching circuit is electrically connected with the LED driving circuit through the dimming signal processing circuit. The dimming switching function circuit disclosed by the utility model is provided with two independent circuits, and the contents of the circuits do not interfere with each other. When the dimming circuit is used, the non-dimming circuit is set to be 0V, and when the non-dimming circuit is used, the dimming circuit is set to be 0V. The high and low levels of the dimming module are switched through the circuit instead of directly and physically disconnecting module VCC power supply, so that the problems that the pin of the module is suspended and the module is easy to damage during physical power failure are prevented, and the reliability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of LED drive dimming, and in particular relates to a dimming switching function circuit. Background Art

[0002] In the design of LED driver dimming solutions, dimming and non-dimming power supplies are usually designed separately, and the two power supply circuits are not the same.

[0003] Conventional dimming and non-dimming switching usually uses a switch line in the dimming VCC power supply part. When the switch line is disconnected, the module has no power supply and cannot be dimmed. However, since each pin of the chip inside the module has a clamping diode, the dimming module can charge the VCC pin through the clamping diode and can be charged to 2V. In this way, the module is at the critical point of opening and the circuit is unreliable.

[0004] Therefore, further improvements are made to the above problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a dimming switching function circuit, which is provided with two independent circuits, and the circuit contents do not interfere with each other. When the dimming circuit is used, the non-dimming circuit is set to 0V, and when the non-dimming circuit is used, the dimming circuit is set to 0V. The high and low levels of the dimming module are switched by the circuit instead of directly physically disconnecting the module VCC power supply, thereby preventing the module pins from being suspended and the module from being easily damaged when the power is physically cut off, thereby improving reliability.

[0006] To achieve the above purpose, the utility model provides a dimming switching function circuit, including a rectifier filter circuit, a power conversion circuit, an LED drive circuit, a dimming signal processing circuit and a dimming non-dimming switching circuit, wherein the filter rectifier circuit is electrically connected to the input end of the LED drive circuit through the power conversion circuit and the output end of the LED drive circuit is connected to the LED, and the dimming non-dimming switching circuit is electrically connected to the LED drive circuit through the dimming signal processing circuit, wherein:

[0007] The dimming and non-dimming switching circuit includes a switch line SW1, a switch line SW2, and a field effect transistor Q6. The dimming signal processing circuit includes a connection unit CON1 (dimming module, Bluetooth interface), a field effect transistor Q5, and a field effect transistor Q4, wherein:

[0008] The switch line SW1 is grounded through the capacitor C22, the switch line SW2 is electrically connected to the second end (+3.0V) of the connection unit CON1, and the second end of the switch line SW2 is electrically connected to the gate of the field effect transistor Q6 through the resistor R61, the drain of the field effect transistor Q6 is connected to the first power supply end (+3.3V2), and the drain of the field effect transistor Q6 is also electrically connected to the anode of the diode D12, and the anode of the diode D2 is connected to the second power supply end (+3.3V) through the resistor R63;

[0009] The fifth end (ON / OFF) of the connection unit CON1 is electrically connected to the gate of the field effect transistor Q5 through the diode D14, the resistor R55 and the diode D9 in sequence, a capacitor C20 is connected between the gate and the source of the field effect transistor Q5 and the capacitor C20 is grounded, the drain of the field effect transistor Q5 is electrically connected to the gate of the field effect transistor Q4 and the drain of the field effect transistor Q4 is electrically connected to the cathode of the diode D11 and the cathode of the diode D8 respectively;

[0010] The LED driving circuit includes a driving chip U2, the fourth end (PWM) of the connecting unit CON1 is electrically connected to the anode of the diode D8 through the resistor R52 and the diode D15, and the anode of the diode D8 is also electrically connected to the 2 pin of the driving chip U2, the anode of the diode D11 is electrically connected to the 7 pin of the driving chip U2, and the 5 pin of the driving chip U2 is connected to the first output terminal (LED+) through the diode D7 and connected to the second output terminal (IED-) through the inductor L2.

[0011] As a further preferred technical solution of the above technical solution, the anode of the diode D9 is also connected to the first power supply terminal (+3.3V2) through the resistor R64 and the diode D13.

[0012] As a further preferred technical solution of the above technical solution, the rectifier filter circuit includes an input terminal ACL and an input terminal CAN, and the input terminal ACL and the input terminal CAN are electrically connected to the input terminal of the rectifier bridge BD1 through the common mode inductor LF1 and the common mode inductor LF2 respectively.

[0013] As a further preferred technical solution of the above technical solution, the power conversion circuit includes a power chip U1 and a transformer TR1, the input end of the power chip U1 is electrically connected to the output end of the rectifier bridge BD1, and the input end of the transformer TR1 is electrically connected to the output end of the rectifier bridge BD1 and the power chip U1 respectively.

[0014] As a further preferred technical solution of the above technical solution, it also includes an auxiliary power supply circuit, which includes a power management chip U3, pin 1 of the power management chip U3 is connected to the third power supply terminal (15V+) and pin 4 of the power management chip U3 is connected to the second power supply terminal (+3.3V) through capacitor C34 and inductor L3. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of a dimming switching function circuit of the utility model.

[0016] Figure 2 The utility model discloses a circuit diagram of an LED driving circuit, a dimming signal processing circuit and a dimming and non-dimming switching circuit of a dimming switching function circuit.

[0017] Figure 3 The utility model discloses a circuit diagram of a rectifying and filtering circuit and a power conversion circuit of a dimming and switching functional circuit.

[0018] Figure 4 The utility model discloses an auxiliary power supply circuit diagram of a dimming switching function circuit. DETAILED DESCRIPTION

[0019] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0020] The utility model discloses a dimming switching function circuit. The specific embodiments of the utility model are further described below in conjunction with the preferred embodiments.

[0021] In the embodiments of the present invention, those skilled in the art note that the Bluetooth interface and the like involved in the present invention may be regarded as prior art.

[0022] Preferred embodiments.

[0023] like Figure 1-4 As shown, the utility model discloses a dimming switching function circuit, including a rectifier filter circuit, a power conversion circuit, an LED drive circuit, a dimming signal processing circuit and a dimming non-dimming switching circuit, wherein the filter rectifier circuit is electrically connected to the input end of the LED drive circuit through the power conversion circuit and the output end of the LED drive circuit is connected to the LED, and the dimming non-dimming switching circuit is electrically connected to the LED drive circuit through the dimming signal processing circuit, wherein:

[0024] The dimming and non-dimming switching circuit includes a switch line SW1, a switch line SW2, and a field effect transistor Q6. The dimming signal processing circuit includes a connection unit CON1 (dimming module, Bluetooth interface), a field effect transistor Q5, and a field effect transistor Q4, wherein:

[0025] The switch line SW1 is grounded through the capacitor C22, the switch line SW2 is electrically connected to the second end (+3.0V) of the connection unit CON1, and the second end of the switch line SW2 is electrically connected to the gate of the field effect transistor Q6 through the resistor R61, the drain of the field effect transistor Q6 is connected to the first power supply end (+3.3V2), and the drain of the field effect transistor Q6 is also electrically connected to the anode of the diode D12, and the anode of the diode D2 is connected to the second power supply end (+3.3V) through the resistor R63;

[0026] The fifth end (ON / OFF) of the connection unit CON1 is electrically connected to the gate of the field effect transistor Q5 through the diode D14, the resistor R55 and the diode D9 in sequence, a capacitor C20 is connected between the gate and the source of the field effect transistor Q5 and the capacitor C20 is grounded, the drain of the field effect transistor Q5 is electrically connected to the gate of the field effect transistor Q4 and the drain of the field effect transistor Q4 is electrically connected to the cathode of the diode D11 and the cathode of the diode D8 respectively;

[0027] The LED driving circuit includes a driving chip U2, the fourth end (PWM) of the connecting unit CON1 is electrically connected to the anode of the diode D8 through the resistor R52 and the diode D15, and the anode of the diode D8 is also electrically connected to the 2 pin of the driving chip U2, the anode of the diode D11 is electrically connected to the 7 pin of the driving chip U2, and the 5 pin of the driving chip U2 is connected to the first output terminal (LED+) through the diode D7 and connected to the second output terminal (IED-) through the inductor L2.

[0028] Specifically, the anode of the diode D9 is also connected to the first power supply terminal (+3.3V2) via the resistor R64 and the diode D13.

[0029] More specifically, the rectification and filtering circuit includes an input terminal ACL and an input terminal CAN, and the input terminal ACL and the input terminal CAN are electrically connected to the input terminal of the rectifier bridge BD1 through a common mode inductor LF1 and a common mode inductor LF2, respectively.

[0030] Furthermore, the power conversion circuit includes a power chip U1 and a transformer TR1, the input end of the power chip U1 is electrically connected to the output end of the rectifier bridge BD1, and the input end of the transformer TR1 is electrically connected to the output end of the rectifier bridge BD1 and the power chip U1 respectively.

[0031] Furthermore, an auxiliary power supply circuit is also included, which includes a power management chip U3, pin 1 of the power management chip U3 is connected to the third power supply terminal (15V+) and pin 4 of the power management chip U3 is connected to the second power supply terminal (+3.3V) through capacitor C34 and inductor L3.

[0032] For this utility model:

[0033] When the Bluetooth module is needed for dimming, the switch line (SW1 SW2) is short-circuited, the gate of Q6 is set to a high level, Q6 is turned on, the 3.3V2 voltage drops to 0V, and no signal is provided to the LED drive circuit. The 3.3V voltage is connected to the dimming module (Bluetooth interface, connected to the Bluetooth module, CON1) through the switch line, VCC is charged, and it starts working. The ON / OFF signal sends a 3.3V high voltage, at which time the C20 voltage slowly charges to more than 2V, and Q5 is turned on. After Q5 is turned on, the gate of Q4 is set to a low level, Q4 is turned off, and the cathode voltage of the two diodes D8 and D11 is raised from 0V to 3.3V.

[0034] At this time, the PWM signal pin of CON1 sends a PWM signal to the LED drive circuit, and the user can control the output current of the LED power supply through the Bluetooth module.

[0035] When the dimming function is not required in the application scenario, disconnect the switch line (SW1 SW2). At this time, 3.3V is disconnected from the dimming module, and the dimming module VCC is 0V and does not work. The ON / OFF signal pin is at a low level, and Q5 is not charged. The gate of Q6 is set to a low level, and the Q6 tube is turned off. At this time, the 3.3V2 voltage is 3.3V, and the circuit charges Q5 through D13. At this time, the C20 voltage is slowly charged to more than 2V, and Q5 is turned on. After Q5 is turned on, the gate of Q4 is set to a low level, Q4 is turned off, and the cathode voltage of the two diodes D8 and D11 is raised from 0V to 3.3V.

[0036] At this time, 3.3V provides a high-level signal to the LED drive circuit through the D12 diode. At this time, the power supply is at full brightness, and the module does not work and will not be interfered by the signal.

[0037] It is worth mentioning that the technical features such as the Bluetooth interface involved in this utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional methods in the field and should not be regarded as the inventive point of this utility model patent. This utility model patent will not be further elaborated.

[0038] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A dimming switching function circuit, characterized in that: It includes a rectifier filter circuit, a power conversion circuit, an LED drive circuit, a dimming signal processing circuit and a dimming non-dimming switching circuit, wherein the rectifier filter circuit is electrically connected to the input end of the LED drive circuit through the power conversion circuit and the output end of the LED drive circuit is connected to the LED, and the dimming non-dimming switching circuit is electrically connected to the LED drive circuit through the dimming signal processing circuit, wherein: The dimming and non-dimming switching circuit includes a switch line SW1, a switch line SW2, and a field effect transistor Q6. The dimming signal processing circuit includes a connection unit CON1, a field effect transistor Q5, and a field effect transistor Q4, wherein: The switch line SW1 is grounded through the capacitor C22, the switch line SW2 is electrically connected to the second end of the connection unit CON1, and the second end of the switch line SW2 is electrically connected to the gate of the field effect transistor Q6 through the resistor R61, the drain of the field effect transistor Q6 is connected to the first power supply terminal, and the drain of the field effect transistor Q6 is also electrically connected to the anode of the diode D12, and the anode of the diode D2 is connected to the second power supply terminal through the resistor R63; The fifth end of the connection unit CON1 is electrically connected to the gate of the field effect transistor Q5 through the diode D14, the resistor R55 and the diode D9 in sequence, a capacitor C20 is connected between the gate and the source of the field effect transistor Q5 and the capacitor C20 is grounded, the drain of the field effect transistor Q5 is electrically connected to the gate of the field effect transistor Q4 and the drain of the field effect transistor Q4 is electrically connected to the cathode of the diode D11 and the cathode of the diode D8 respectively; The LED driving circuit includes a driving chip U2, the fourth end of the connecting unit CON1 is electrically connected to the anode of the diode D8 through the resistor R52 and the diode D15, and the anode of the diode D8 is also electrically connected to the 2 pin of the driving chip U2, the anode of the diode D11 is electrically connected to the 7 pin of the driving chip U2, and the 5 pin of the driving chip U2 is connected to the first output terminal through the diode D7 and connected to the second output terminal through the inductor L2.

2. A dimming switching function circuit according to claim 1, characterized in that: The anode of the diode D9 is also connected to the first power supply terminal via the resistor R64 and the diode D13.

3. A dimming switching function circuit according to claim 2, characterized in that: The rectifier and filter circuit comprises an input terminal ACL and an input terminal CAN, and the input terminal ACL and the input terminal CAN are electrically connected to the input terminal of the rectifier bridge BD1 through a common mode inductor LF1 and a common mode inductor LF2 respectively.

4. The dimming switching function circuit according to claim 3, characterized in that: The power conversion circuit includes a power chip U1 and a transformer TR1. The input end of the power chip U1 is electrically connected to the output end of the rectifier bridge BD1. The input end of the transformer TR1 is electrically connected to the output end of the rectifier bridge BD1 and the power chip U1, respectively.

5. A dimming switching function circuit according to claim 4, characterized in that: It also includes an auxiliary power supply circuit, which includes a power management chip U3, wherein pin 1 of the power management chip U3 is connected to the third power supply terminal and pin 4 of the power management chip U3 is connected to the second power supply terminal through capacitor C34 and inductor L3.

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