12 or 4V switching constant-voltage power supply conforming to multiple paths of output and multiple dimming modes

Abstract

The invention discloses a 12 or 4V switching constant voltage power supply conforming to multiple paths of output and multiple dimming modes. An EMI module; a PFC boost module; the isolation conversion module is connected with the PFC boost module, isolates and converts the input voltage, outputs the isolated and converted input voltage to a plurality of groups of power limiting modules, and outputs the isolated and converted input voltage to an LED through a dimming MOS module; the PFC boost module is also connected with an input signal detection module through a quick start module so as to carry out signal detection; and the dimming control module is connected with the input signal detection module and the dimming MOS module. And a comparator is used for power limitation. The power supply has the characteristics that the circuit is simple, the cost is low, the debugging is convenient, whether the output is directly closed or a constant current mode is entered during protection can be selected according to the requirements of customers, and the power supply integrating silicon controlled rectifier dimming, 0-10V dimming, PWM dimming and resistance dimming is adopted, so that a user can randomly select the dimming mode.

Description

Technical Field

[0001] This invention relates to the field of LED power supplies, specifically a 12 or 4V switching constant voltage power supply that is compatible with multiple outputs and multiple dimming modes. Background Technology

[0002] Because the US Class 2 standard requires that the single output current not exceed 5A and the maximum power not exceed 100W, exceeding these specifications results in complex circuit structures and higher costs. Secondly, the variety of common dimming methods on the market leads to tight inventory for companies. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a 12V or 4V switching constant voltage power supply that is compatible with multiple outputs and various dimming modes, including: An EMI module is used to receive, filter, and output mains power. The PFC boost module, connected to the EMI module, is used to boost the input voltage and output it. An isolation conversion module, connected to the PFC boost module, isolates and converts the input voltage and outputs it to multiple power limiting modules, and then outputs it to the LED through a dimming MOS module; The PFC boost module is also connected to an input signal detection module via a fast start module for signal detection. A dimming control module is connected to the input signal detection module and the dimming MOS module, and dims the light according to the detected signal. It also includes an output voltage control module connected to the power limiting module.

[0004] In some embodiments, the system further includes a three-in-one control module connected to the dimming control module, the three-in-one control module being connected to a dimmer.

[0005] In some embodiments, the power limiting module includes; Main control unit U13; Resistor R112, one end of which is connected to the isolation conversion module, and the other end is connected to the negative phase input of the comparator unit U13A. This end is also connected to the source of MOSFET Q1. The drain of MOSFET Q1 is connected to the output terminal, and the gate is connected to the main control unit U2, so that the main control unit U2 can collect the current power. If it is too high, the output of the isolation conversion module will be turned off. The non-inverting input of the comparator unit U13A receives a voltage, and its output is connected to the positive terminal of the light-emitting terminal of the optocoupler U6. The negative terminal of the light-emitting terminal is grounded. The collector of the optocoupler U6 is connected to the main control unit U2, and its emitter is grounded.

[0006] In some embodiments, the output voltage control module includes; The operational amplifier unit U10B has its output terminal connected to the negative terminal of the light-emitting terminal of the optocoupler U6 in sequence through resistor R143 and diode D45. The non-inverting terminal receives a voltage, and the inverting terminal is grounded through resistor R148. The inverting terminal is also connected to a voltage in sequence through resistor R147 and resistor R197. It also includes a terminal JP1, the two ends of which are connected to the two ends of resistor R197.

[0007] In some embodiments, the input signal detection module includes: Transistor QS1 has a base that receives the start signal, an emitter that is grounded, and a collector that is connected to the gate of MOSFET Q9. The gate of the MOS transistor Q9 is also connected to the mains power through resistors R39, R26 and R23, the drain is connected to resistor R26, and the source is grounded through resistors R59 and R69. It also includes a transistor QS2, whose base is connected to the mains power through resistors RS5 and RS1, its emitter is grounded, and its collector is connected to the negative terminal of the light-emitting end of optocoupler US1. The positive terminal of the light-emitting end of optocoupler US1 is connected to the fast start module.

[0008] In some embodiments, the dimming control module includes; Main control unit U4; The base of transistor Q2 is connected to the collector of optocoupler US1. The emitter of optocoupler US1 is grounded, and the emitter of transistor Q2 is grounded. The collector is connected to a voltage through resistor R3, and this terminal is also connected to the main control unit U4. The base of transistor Q3 is connected to the collector of optocoupler US1, the emitter is grounded, the collector is connected to a voltage through resistor R1, and the base is also connected to a voltage through resistor R4. The operational amplifier unit U36 has its non-inverting terminal connected to resistor R1 via diode D1 and resistor R2, its inverting terminal grounded via resistor R12, and its output terminal connected to the main control unit U4.

[0009] Beneficial effects This invention provides a 12V or 4V switching constant voltage power supply that supports multiple outputs and various dimming modes. Compared with the prior art, it has the following advantages: This application presents a high-power power supply designed to meet US Class 2 standards. It employs a comparator for power limiting. Key features include: simple circuitry, low cost, and easy debugging. Customers can choose whether to directly shut down the output or enter constant current mode for protection. Furthermore, it integrates SCR dimming, 0-10V dimming, PWM dimming, and resistor dimming into one power supply. Users can freely select dimming modes, and companies can reduce the variety of power supplies they need and decrease inventory. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the block structure of the present invention; Figure 2 This is a schematic diagram of the circuit structure of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the circuit structure of the present invention. Figure 2 . Detailed Implementation

[0011] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0012] Please see Figure 1-3 The present invention provides a technical solution: a 12 or 4V switching constant voltage power supply that conforms to multiple outputs and multiple dimming modes, characterized in that it includes; An EMI module is used to receive, filter, and output mains power. The PFC boost module, connected to the EMI module, is used to boost the input voltage and output it. An isolation conversion module, connected to the PFC boost module, isolates and converts the input voltage and outputs it to multiple power limiting modules, and then outputs it to the LED through a dimming MOS module; The PFC boost module is also connected to an input signal detection module via a fast start module for signal detection. A dimming control module is connected to the input signal detection module and the dimming MOS module, and dims the light according to the detected signal. It also includes an output voltage control module connected to the power limiting module.

[0013] In this embodiment, a three-in-one control module connected to the dimming control module is also included, and the three-in-one control module is connected to a dimmer.

[0014] In this embodiment, the power limiting module includes: Main control unit U13; Resistor R112, one end of which is connected to the isolation conversion module, and the other end is connected to the negative phase input of the comparator unit U13A. This end is also connected to the source of MOSFET Q1. The drain of MOSFET Q1 is connected to the output terminal, and the gate is connected to the main control unit U2, so that the main control unit U2 can collect the current power. If it is too high, the output of the isolation conversion module will be turned off. The non-inverting input of the comparator unit U13A receives a voltage, and its output is connected to the positive terminal of the light-emitting terminal of the optocoupler U6. The negative terminal of the light-emitting terminal is grounded. The collector of the optocoupler U6 is connected to the main control unit U2, and its emitter is grounded.

[0015] In this embodiment, the output voltage control module includes: The operational amplifier unit U10B has its output terminal connected to the negative terminal of the light-emitting terminal of the optocoupler U6 in sequence through resistor R143 and diode D45. The non-inverting terminal receives a voltage, and the inverting terminal is grounded through resistor R148. The inverting terminal is also connected to a voltage in sequence through resistor R147 and resistor R197. It also includes a terminal JP1, the two ends of which are connected to the two ends of resistor R197.

[0016] The output voltage control module controls the output voltage. R197, R147, JP1, R148, R150, A, U10, R143, D45, R145, C57, and C56 together form the output voltage control module. R197, R147, and R148 sample the output voltage and compare it with the 2.5V reference of comparator U10. After comparison, the output signal is current-limited by R57 and R143 and sent to the optocoupler. After isolation by the optocoupler, the signal is transmitted to the primary winding, thereby controlling the output voltage. JP1 is an adjustable resistor, which, together with R197 and R147, forms the upper bias resistor of the comparator. Changing the value of JP1 changes the upper bias resistor of the comparator, thereby changing the output voltage. The output voltage is flexible and variable. R148, R150, and A form the lower bias of the sampling resistor. When point A is short-circuited, R148 and R150 are connected in parallel, the lower bias resistor decreases, and the output voltage increases, thus achieving the purpose of switching the output voltage.

[0017] In this embodiment, the input signal detection module includes: Transistor QS1 has a base that receives the start signal, an emitter that is grounded, and a collector that is connected to the gate of MOSFET Q9. The gate of the MOS transistor Q9 is also connected to the mains power through resistors R39, R26 and R23, the drain is connected to resistor R26, and the source is grounded through resistors R59 and R69. It also includes a transistor QS2, whose base is connected to the mains power through resistors RS5 and RS1, its emitter is grounded, and its collector is connected to the negative terminal of the light-emitting end of optocoupler US1. The positive terminal of the light-emitting end of optocoupler US1 is connected to the fast start module.

[0018] In this embodiment, the dimming control module includes: Main control unit U4; The base of transistor Q2 is connected to the collector of optocoupler US1. The emitter of optocoupler US1 is grounded, and the emitter of transistor Q2 is grounded. The collector is connected to a voltage through resistor R3, and this terminal is also connected to the main control unit U4. The base of transistor Q3 is connected to the collector of optocoupler US1, the emitter is grounded, the collector is connected to a voltage through resistor R1, and the base is also connected to a voltage through resistor R4. The operational amplifier unit U36 has its non-inverting terminal connected to resistor R1 via diode D1 and resistor R2, its inverting terminal grounded via resistor R12, and its output terminal connected to the main control unit U4.

[0019] The working principle is as follows: After EMI filtering and rectification, LN outputs a pulsating DC current with a flat wave. This DC current, after passing through D17, C58, R91, R92, U5, R185, D19, L6, R186, D25, C95, C90, R187, and C39, outputs a 15V DC current to provide the startup VCC for U11 and U2. Conventional power supplies use resistors to draw VCC, but in SCR dimming power supplies, startup times are long when the input voltage is very low, resulting in a poor user experience. The advantage of this circuit is that it utilizes a non-isolated BUCK circuit, allowing for rapid VCC establishment even at very low input voltages, thus achieving fast startup.

[0020] After VCC reaches 15V, the B PFC boost module starts working, boosting the PFC voltage to 420V. Then, the C isolation conversion module starts working, reducing the voltage to the operating voltage such as 12V / 24V.

[0021] The D power limiting module is used for output current shunting. The outputs share a common positive terminal, and the negative terminal is then shunted through resistors R112, R113, R114, R115, and R157 to output VO1-, VO2-, VO3-, VO4-, and VO5- as negative terminals. Each output group is independently power-limited, ensuring that the power of each group does not exceed the Class 2 standard. The higher the output power, the more groups are needed. The single-group operation principle is as follows: current flows through R112. When the output current exceeds the design current, it is fed back to comparator U13 via resistor R138. The comparator outputs a low level, and U6 feeds back the signal to the primary side, shutting down the output. This achieves the protection purpose. Subsequently, U2 restarts. If the output current still exceeds the limit, protection continues; if the abnormality is resolved, normal output resumes.

[0022] Input detection circuits D4, D5, R23, R26, R45, R39, R59, R69, Q9, ZS1, DS1, CS1, RS1, RS2, RS3, RS4, RS5, RS6, RS7, QS2, and US1 are used to acquire the input bridge signal. The acquired signal is then converted into a PWM signal via optocoupler isolation and transmitted to the secondary side.

[0023] The F-type thyristor + three-in-one dimming module converts the US1 signal, filters it with an RC filter, and outputs a DC signal to the microcontroller for dimming control. U7 is a three-in-one dimming IC that outputs a PWM signal, which is transmitted to the secondary side after optocoupler isolation. It is then filtered with an RC filter to obtain a DC signal for dimming control. U4 collects and processes the thyristor dimming signal and the three-in-one dimming signal respectively, and outputs a PWM signal to control Q1, Q17, Q18, Q19, and Q20 to perform chopping dimming and thus control the brightness of the output lamps.

[0024] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

Claims

1. A 12V or 4V switching constant voltage power supply that supports multiple outputs and multiple dimming modes, characterized in that, include; An EMI module is used to receive, filter, and output mains power. The PFC boost module, connected to the EMI module, is used to boost the input voltage and output it. An isolation conversion module, connected to the PFC boost module, isolates and converts the input voltage and outputs it to multiple power limiting modules, and then outputs it to the LED through a dimming MOS module; The PFC boost module is also connected to an input signal detection module via a fast start module for signal detection. A dimming control module is connected to the input signal detection module and the dimming MOS module, and dims the light according to the detected signal. It also includes an output voltage control module connected to the power limiting module.

2. The 12V or 4V switching constant voltage power supply conforming to multiple outputs and multiple dimming modes according to claim 1, characterized in that: It also includes a three-in-one control module connected to the dimming control module, the three-in-one control module being connected to a dimmer.

3. A 12V or 4V switching constant voltage power supply conforming to multiple outputs and multiple dimming modes according to claim 1, characterized in that: The power limiting module includes: Main control unit U13; Resistor R112, one end of which is connected to the isolation conversion module, and the other end is connected to the negative phase input of the comparator unit U13A. This end is also connected to the source of MOSFET Q1. The drain of MOSFET Q1 is connected to the output terminal, and the gate is connected to the main control unit U2, so that the main control unit U2 can collect the current power. If it is too high, the output of the isolation conversion module will be turned off. The non-inverting input of the comparator unit U13A receives a voltage, and its output is connected to the positive terminal of the light-emitting terminal of the optocoupler U6. The negative terminal of the light-emitting terminal is grounded. The collector of the optocoupler U6 is connected to the main control unit U2, and its emitter is grounded.

4. A 12V or 4V switching constant voltage power supply conforming to multiple outputs and multiple dimming modes according to claim 3, characterized in that: The output voltage control module includes: The operational amplifier unit U10B has its output terminal connected to the negative terminal of the light-emitting terminal of the optocoupler U6 in sequence through resistor R143 and diode D45. The non-inverting terminal receives a voltage, and the inverting terminal is grounded through resistor R148. The inverting terminal is also connected to a voltage in sequence through resistor R147 and resistor R197. It also includes a terminal JP1, the two ends of which are connected to the two ends of resistor R197.

5. A 12V or 4V switching constant voltage power supply conforming to multiple outputs and multiple dimming modes according to claim 1, characterized in that: The input signal detection module includes: Transistor QS1 has a base that receives the start signal, an emitter that is grounded, and a collector that is connected to the gate of MOSFET Q9. The gate of the MOS transistor Q9 is also connected to the mains power through resistors R39, R26 and R23, the drain is connected to resistor R26, and the source is grounded through resistors R59 and R69. It also includes a transistor QS2, whose base is connected to the mains power through resistors RS5 and RS1, its emitter is grounded, and its collector is connected to the negative terminal of the light-emitting end of optocoupler US1. The positive terminal of the light-emitting end of optocoupler US1 is connected to the fast start module.

6. A 12V or 4V switching constant voltage power supply conforming to multiple outputs and multiple dimming modes according to claim 5, characterized in that: The dimming control module includes: Main control unit U4; The base of transistor Q2 is connected to the collector of optocoupler US1. The emitter of optocoupler US1 is grounded, and the emitter of transistor Q2 is grounded. The collector is connected to a voltage through resistor R3, and this terminal is also connected to the main control unit U4. The base of transistor Q3 is connected to the collector of optocoupler US1, the emitter is grounded, the collector is connected to a voltage through resistor R1, and the base is also connected to a voltage through resistor R4. The operational amplifier unit U36 has its non-inverting terminal connected to resistor R1 via diode D1 and resistor R2, its inverting terminal grounded via resistor R12, and its output terminal connected to the main control unit U4.

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