CN220210637U

CN220210637U - Power supply circuit compatible with low-voltage mercury lamp and LED

Info

Publication number: CN220210637U
Application number: CN202321393781.6U
Authority: CN
Inventors: 陈树根; 丁亮亮; 林大钧
Original assignee: Xiamen Nengqiang Electronic Technology Co ltd
Current assignee: Xiamen Nengqiang Electronic Technology Co ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2023-12-19
Anticipated expiration: 2033-06-02

Abstract

The utility model relates to a power circuit compatible with a low-voltage mercury lamp and an LED, which comprises a control module, and a three-phase rectifying module, a BUCK_DC module, a bridge type inversion module, an LC resonance module and a control module which are sequentially connected; the control module collects output voltages and output currents of the BUCK_DC module and the bridge type inversion module, outputs a first control signal to the BUCK_DC module and outputs a second control signal to the bridge type inversion module; the power-on end of the LED module is provided with a rectifier bridge; when the LC resonance module is connected with the low-pressure mercury lamp, the bridge type inversion module outputs a high-frequency square wave, and the high-frequency square wave and the LC resonance module resonate to generate high-pressure to light the low-pressure mercury lamp; when the LC resonance module is connected with the LED module, the bridge type inversion module outputs a low-frequency constant-voltage source, and the low-frequency constant-voltage source is rectified by the rectifier bridge to light the LED. The utility model can realize the switching between the UV-LED and the low-voltage UV mercury lamp without modification, and has stable power supply and high efficiency. In addition, the utility model does not use a transformer, has higher efficiency relatively, is beneficial to saving cost and energy and has simple structure.

Description

Power supply circuit compatible with low-voltage mercury lamp and LED

Technical Field

The utility model relates to the technical field of UV power supplies, in particular to a power supply circuit compatible with a low-voltage mercury lamp and an LED.

Background

With the phase out of the UV mercury lamp in the market, the UV-LED has the characteristics of safety, environmental protection, high efficiency and the like, is a more advantageous substitute, and has huge market potential. However, due to replacement cost, inventory and other reasons, the current UV mercury lamps are still used in a large quantity, the complete replacement of the UV mercury lamps by the UV-LEDs in a short period of time is basically not realized, and the replacement of the UV lamps has a long path.

The existing mercury lamp control power supply is generally controlled by a conventional transformer, and finally alternating current is applied to two ends of the mercury lamp. While the LED control power supply is typically a constant voltage control power supply or a constant current control power supply, and the direct current is ultimately applied to the LED lamp. Because the control power supply of the mercury lamp and the control power supply of the LED are completely two different power supplies, when a user upgrades the mercury lamp into the LED lamp, the user not only needs to replace the mercury lamp box with the LED lamp box, but also needs to replace the control power supply of the mercury lamp with the control power supply special for the LED, which can lead to the problems of increased user cost, prolonged wiring and installation time, incapability of recycling of the prior equipment, and the like. In order to promote product replacement and upgrading, the power supply circuit compatible with the mercury lamp and the LED is significant.

In addition, the current power supply circuits of mercury lamps and LEDs are basically realized based on transformers, the circuits are complex, and iron loss and copper loss are avoided due to the existence of the transformers, so that the power supply circuits are relatively low in efficiency and are unfavorable for energy-saving control.

Disclosure of Invention

The utility model aims to provide a power circuit compatible with a low-voltage mercury lamp and an LED, which can be compatible with and supply power to a UV-LED and a low-voltage UV mercury lamp without modification, does not use a transformer, has high efficiency, is beneficial to saving cost and energy, and has a simple structure.

In order to achieve the above purpose, the utility model discloses a power circuit compatible with a low-voltage mercury lamp and an LED, which comprises a three-phase rectifying module, a BUCK_DC module, a bridge inverter module, an LC resonance module and a control module;

the three-phase rectifying module, the BUCK_DC module, the bridge type inversion module and the LC resonance module are sequentially connected, and the three-phase rectifying module is connected with three-phase alternating current to obtain electricity; the control module acquires output voltages and output currents of the BUCK_DC module and the bridge type inversion module, the control module outputs a first control signal to the BUCK_DC module, and the control module outputs a second control signal to the bridge type inversion module; the BUCK_DC module regulates output voltage and current according to a first control signal, and the bridge type inversion module regulates the frequency of the output voltage according to a second control signal;

the LC resonance module is connected with a low-voltage mercury lamp or an LED module, and a rectifier bridge is arranged at the power-in end of the LED module; when the LC resonance module is connected with the low-voltage mercury lamp, the bridge type inversion module outputs a high-frequency square wave, and the high-frequency square wave and the LC resonance module resonate to generate high-voltage to light the low-voltage mercury lamp; when the LC resonance module is connected with the LED module, the bridge type inversion module outputs a low-frequency constant-voltage source, the low-frequency constant-voltage source does not resonate with the LC resonance module, and the low-frequency constant-voltage source is rectified by the rectifier bridge to light the LED.

Preferably, the three-phase rectifying module comprises a three-phase rectifying bridge and a capacitor C1, and the capacitor C1 is connected in parallel with the output end of the three-phase rectifying bridge.

Preferably, the buck_dc module includes an IGBT1, an IGBT2, a diode D7, an inductor L3, and a capacitor C2, where collectors of the IGBT1 and the IGBT2 are connected to an output anode of the three-phase rectifying module, gates of the IGBT1 and the IGBT2 are connected to the control module and receive the first control signal, emitters of the IGBT1 and the IGBT2 are connected to a cathode of the diode D7 and one end of the inductor L3, another end of the inductor L3 is connected to one end of the capacitor C2, and another end of the capacitor C2 is connected to an anode of the diode D7 and an output cathode of the three-phase rectifying module.

Preferably, the bridge inverter module comprises an IGBT3, an IGBT4, an IGBT5 and an IGBT6, wherein gates of the IGBT3, the IGBT4, the IGBT5 and the IGBT6 are connected with the control module and receive a second control signal; the collectors of the IGBT3 and the IGBT4 are connected with the output anode of the BUCK_DC module, the emitters of the IGBT5 and the IGBT6 are connected with the output cathode of the BUCK_DC module, the emitter of the IGBT3 is connected with the collector of the IGBT5 and serves as the output cathode of the bridge type inversion module, and the emitter of the IGBT4 is connected with the collector of the IGBT6 and serves as the output anode of the bridge type inversion module.

Preferably, the LC resonance module includes an inductor L1, an inductor L2 and a capacitor CB1, one end of the inductor L1 is connected to the output anode of the bridge inverter module, and the other end of the inductor L1 is connected to one end of the capacitor CB1 and is used as the output anode of the LC resonance module; one end of the inductor L2 is connected with the output cathode of the bridge type inversion module, and the other end of the inductor L2 is connected with the other end of the capacitor BC1 and serves as the output cathode of the LC resonance module.

Preferably, the LED module comprises at least two paths of LED loads and at least two current-sharing dimming units, the LED loads and the current-sharing dimming units are in one-to-one correspondence, the input end of the rectifier bridge is connected with the output end of the LC resonance module, the positive electrode of the LED loads is connected with the output positive electrode of the rectifier unit, and the output negative electrode of the rectifier bridge is grounded; and the negative electrode of the LED load is connected with the current-sharing dimming unit.

Preferably, the current equalizing and dimming unit comprises a triode S, a chip IC and a resistor RS, wherein a collector electrode of the triode S is connected with a negative electrode of the LED load, an emitter electrode of the triode S is connected with a 1 pin of the chip IC and one end of the resistor RS, and the other end of the resistor RS is connected with a 2 pin of the chip IC and grounded; the base of the triode S is connected with the 5 pin of the chip IC.

Preferably, the control module comprises a voltage and current acquisition unit, a constant current control unit, a constant voltage control unit and an MCU unit, wherein the voltage and current acquisition unit is connected with the BUCK_DC module and the bridge type inversion module and acquires output voltage and output current; the constant current control unit and the constant voltage control unit are both connected with the voltage and current acquisition unit, and the MCU unit is connected with the constant current control unit, the constant voltage control unit, the BUCK_DC module and the bridge type inversion module.

Preferably, the constant current control unit and the constant voltage control unit each comprise a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a diode D, the voltage and current acquisition unit is provided with a sampling resistor, the power-in end of the sampling resistor is connected with one end of the first resistor and the non-inverting input end of the first operational amplifier through the second resistor, and the other end of the first resistor is grounded; the output end of the sampling resistor is connected with the inverting input end of the first operational amplifier and one end of a fourth resistor through a third resistor, the other end of the fourth resistor is connected with the output end of the first operational amplifier and one end of a fifth resistor, the other end of the fifth resistor is connected with the inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier receives a reference voltage through a sixth resistor, and the reference voltage is supplied by an MCU unit or an external circuit; the output end of the second operational amplifier is connected with one end of a seventh resistor and the cathode of the diode D, and the other end of the seventh resistor is connected with the anode of the diode D and the MCU unit.

Preferably, the system further comprises a temperature detection module, wherein the temperature detection module detects the temperatures of the BUCK_DC module and the bridge type inversion module and feeds the temperatures back to the control module.

The utility model has the following beneficial effects:

when the low-pressure mercury lamp is connected, the control module controls the bridge type inversion module to output a high-frequency square wave, and the high-frequency square wave and the LC resonance module resonate to generate high pressure so as to light the low-pressure mercury lamp. When the LED is connected, the control module controls the bridge type inversion module to output a low-frequency constant-voltage source, the low-frequency constant-voltage source cannot resonate with the LC resonance module, the LC resonance module is equivalent to a wire in the state, the output of the low-frequency constant-voltage source cannot be influenced, and the low-frequency constant-voltage source can light the LED after rectification. The utility model can realize the switching between the UV-LED and the low-voltage UV mercury lamp without modification, has stable power supply and high efficiency, and is beneficial to the upgrading and modification of UV luminous products. In addition, the utility model does not use a transformer, has higher efficiency relatively, is beneficial to saving cost and energy and has simple structure.

Drawings

Fig. 1 is a schematic diagram of the present utility model.

Fig. 2 is a schematic diagram of a three-phase rectification module.

FIG. 3 is a schematic diagram of the BUCK_DC module.

Fig. 4 is a schematic diagram of a bridge inverter module.

Fig. 5 is a schematic diagram of an LC resonance module.

Fig. 6 is a schematic diagram of a constant current control unit and a constant voltage control unit.

Fig. 7 is a schematic diagram of an LED module.

Main component symbol description:

the three-phase rectifier module 10, the BUCK_DC module 20, the bridge inverter module 30, the LC resonance module 40, the voltage and current acquisition unit 51, the constant current control unit 52, the constant voltage control unit 53, the MCU unit 54 and the temperature detection module 60.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

As shown in fig. 1 to 7, the present utility model discloses a power circuit compatible with a low-voltage mercury lamp and an LED, which includes a three-phase rectifying module 10, a buck_dc module 20, a bridge inverter module 30, an LC resonance module 40, a control module, and a temperature detecting module 60.

The three-phase rectifying module 10, the BUCK_DC module 20, the bridge type inversion module 30 and the LC resonance module 40 are sequentially connected, the three-phase rectifying module 10 is connected with three-phase alternating current to obtain electricity, the three-phase rectifying module 10 comprises a three-phase rectifying bridge (D1/D2/D3/D3/D5/D6) and a capacitor C1, and the capacitor C1 is connected in parallel with the output end (P+/P-) of the three-phase rectifying bridge.

The buck_dc module 20 is configured to output a DC voltage, and obtain an output effect of a higher switching frequency at a lower switching frequency, and includes an IGBT1, an IGBT2, a diode D7, an inductor L3, and a capacitor C2, wherein collectors of the IGBT1 and the IGBT2 are connected to an output positive pole (p+) of the three-phase rectifying module 10, gates of the IGBT1 and the IGBT2 are connected to the control module and receive a first control signal, emitters of the IGBT1 and the IGBT2 are connected to a cathode of the diode D7 and one end of the inductor L3, another end of the inductor L3 is connected to one end of the capacitor C2, and another end of the capacitor C2 is connected to an anode of the diode D7 and an output negative pole (P-) of the three-phase rectifying module 10.

The bridge inverter module 30 is configured to output an ac square wave at a fixed frequency through a full-bridge inverter topology from the output DC voltage converted by the buck_dc module 20. The bridge inverter module 30 comprises an IGBT3, an IGBT4, an IGBT5 and an IGBT6, wherein gates of the IGBT3, the IGBT4, the IGBT5 and the IGBT6 are connected with the control module and receive a second control signal; the collectors of the IGBTs 3 and 4 are connected with the output anode (V_DC) of the BUCK_DC module 20, the emitters of the IGBTs 5 and 6 are connected with the output cathode (P-) of the BUCK_DC module 20, the emitter of the IGBTs 3 is connected with the collector of the IGBTs 5 and serves as the output cathode (UV_B) of the bridge inverter module 30, and the emitter of the IGBTs 4 is connected with the collector of the IGBTs 6 and serves as the output anode (UV_A) of the bridge inverter module 30.

The LC resonance module 40 includes an inductor L1, an inductor L2 and a capacitor CB1, wherein one end of the inductor L1 is connected to the output positive electrode (uv_a) of the bridge inverter module 30, and the other end of the inductor L1 is connected to one end of the capacitor CB1 and serves as the output positive electrode (uv+); one end of the inductor L2 is connected to the output negative electrode (uv_b) of the bridge inverter module 30, and the other end of the inductor L2 is connected to the other end of the capacitor BC1 and serves as the output negative electrode (UV-) of the LC resonator module 40.

The output (UV+/UV-) of the LC resonance module 40 is connected to a low-pressure mercury lamp or LED module. The power supply end of the LED module is required to be provided with a rectifier bridge (D8/D9/D10/D11). The LED module comprises at least two paths of LED loads and at least two current-sharing dimming units, and the LED loads and the current-sharing dimming units are in one-to-one correspondence. The input end of the rectifier bridge (D8/D9/D10/D11) is connected with the output end of the LC resonance module 40, the positive electrode of the LED load is connected with the output positive electrode of the rectifier unit, the output negative electrode of the rectifier bridge (D8/D9/D10/D11) is grounded, and the negative electrode of the LED load is connected with the current equalizing and dimming unit. The current equalizing and dimming unit comprises a triode S, a chip IC and a resistor RS, wherein the chip IC is a dimming control chip. The collector of the triode S is connected with the negative electrode of the LED load, the emitter of the triode S is connected with the 1 pin of the chip IC and one end of the resistor RS, the other end of the resistor RS is connected with the 2 pin of the chip IC and grounded, and the base of the triode S is connected with the 5 pin of the chip IC. With the above arrangement, multiple LED loads can be individually lit or dimmed.

The control module includes a voltage and current collection unit 51, a constant current control unit 52, a constant voltage control unit 53 and an MCU unit 54, the voltage and current collection unit 51 connects the buck_dc module 20 and the bridge inverter module 30 and collects an output voltage and an output current, specifically, the voltage and current collection unit 51 collects an output voltage and an output current of the buck_dc module 20 and collects an output current of the bridge inverter module 30. The constant current control unit 52 is connected to the voltage and current acquisition unit 51 and the MCU unit 54 to receive the real-time detection current and feedback how the MCU unit 54 should regulate the output current, and similarly, the constant voltage control unit 53 is connected to the voltage and current acquisition unit 51 and the MCU unit 54 to receive the real-time detection voltage and feedback how the MCU unit 54 should regulate the output voltage. The MCU summarizes feedback from the constant current control unit 52 and the constant voltage control unit 53, thereby outputting a first control signal to the buck_dc module 20, outputting a second control signal to the bridge inverter module 30, the buck_dc module 20 adjusting the output voltage and current according to the first control signal, and the bridge inverter module 30 adjusting the frequency of its output voltage according to the second control signal.

In this case, the circuit structures of the constant current control unit 52 and the constant voltage control unit 53 are the same, taking the constant voltage control unit 53 as an example for explanation, which includes a first operational amplifier U2A, a second operational amplifier U2B, a first resistor R8, a second resistor R9, a third resistor R10, a fourth resistor R11, a fifth resistor R12, a sixth resistor R13, a seventh resistor R14 and a diode D13, where the voltage and current acquisition unit 51 is provided with a sampling resistor, the power supply end of the sampling resistor is connected to one end of the first resistor R8 and the non-inverting input end of the first operational amplifier U2A through the second resistor R9, and the other end of the first resistor R8 is grounded; the power-out end of the sampling resistor is connected with the inverting input end of the first operational amplifier U2A and one end of a fourth resistor R11 through a third resistor R10, the other end of the fourth resistor R11 is connected with the output end of the first operational amplifier U2A and one end of a fifth resistor R12, the other end of the fifth resistor R12 is connected with the inverting input end of the second operational amplifier U2B, the non-inverting input end of the second operational amplifier U2B receives a reference voltage through a sixth resistor R13, and the reference voltage is supplied by the MCU unit 54 or an external circuit; the output end of the second operational amplifier U2B is connected to one end of the seventh resistor R14 and the negative electrode of the diode D13, and the other end of the seventh resistor R14 is connected to the positive electrode of the diode D13 and the MCU unit 54. Of course, the constant current control unit 52 and the constant voltage control unit 53 may be other existing constant current control units 52 and constant voltage control units 53. The MCU unit 54 is a circuit configured based on R5F21238DFP, and of course, other chips capable of receiving small dc signals and outputting PMW signals may be used.

When the LC resonance module 40 is connected to the low-pressure mercury lamp, the MCU unit 54 is set to make the bridge inverter module 30 output a high-frequency square wave, and the high-frequency square wave resonates with the LC resonance module 40 to generate a high voltage, so that the low-pressure mercury lamp can be turned on. When the LC resonance module 40 is connected to the LED module, the MCU unit 54 is set to enable the bridge inverter module 30 to output a low-frequency constant-voltage source, which does not resonate with the LC resonance module 40, and the LC resonance module 40 corresponds to a wire, and the low-frequency constant-voltage source can illuminate the LED after rectifying through the rectifier bridge (D8/D9/D10/D11).

The temperature detection module 60 is used for detecting the temperatures of the BUCK_DC module 20 and the bridge inverter module 30 and feeding back to the control module, and plays a role in temperature monitoring so as to ensure that a power circuit is cut off in time when the temperature exceeds the temperature, and ensure the circuit safety. The temperature detection module 60 may be constituted by a plurality of temperature sensors.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.

Claims

1. A power supply circuit compatible with a low-pressure mercury lamp and an LED, characterized in that: the device comprises a three-phase rectifying module, a BUCK_DC module, a bridge type inversion module, an LC resonance module and a control module;

2. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the three-phase rectifying module comprises a three-phase rectifying bridge and a capacitor C1, and the capacitor C1 is connected in parallel with the output end of the three-phase rectifying bridge.

3. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the BUCK_DC module comprises an IGBT1, an IGBT2, a diode D7, an inductor L3 and a capacitor C2, wherein collectors of the IGBT1 and the IGBT2 are connected with an output anode of the three-phase rectifying module, gates of the IGBT1 and the IGBT2 are connected with the control module and receive a first control signal, emitters of the IGBT1 and the IGBT2 are connected with a cathode of the diode D7 and one end of the inductor L3, the other end of the inductor L3 is connected with one end of the capacitor C2, and the other end of the capacitor C2 is connected with an anode of the diode D7 and an output cathode of the three-phase rectifying module.

4. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the bridge type inversion module comprises IGBT3, IGBT4, IGBT5 and IGBT6, and the gates of the IGBT3, the IGBT4, the IGBT5 and the IGBT6 are connected with the control module and receive a second control signal; the collectors of the IGBT3 and the IGBT4 are connected with the output anode of the BUCK_DC module, the emitters of the IGBT5 and the IGBT6 are connected with the output cathode of the BUCK_DC module, the emitter of the IGBT3 is connected with the collector of the IGBT5 and serves as the output cathode of the bridge type inversion module, and the emitter of the IGBT4 is connected with the collector of the IGBT6 and serves as the output anode of the bridge type inversion module.

5. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the LC resonance module comprises an inductor L1, an inductor L2 and a capacitor CB1, one end of the inductor L1 is connected with the output anode of the bridge type inversion module, and the other end of the inductor L1 is connected with one end of the capacitor CB1 and serves as the output anode of the LC resonance module; one end of the inductor L2 is connected with the output cathode of the bridge type inversion module, and the other end of the inductor L2 is connected with the other end of the capacitor BC1 and serves as the output cathode of the LC resonance module.

6. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the LED module comprises at least two paths of LED loads and at least two current-sharing dimming units, the LED loads and the current-sharing dimming units are in one-to-one correspondence, the input end of the rectifier bridge is connected with the output end of the LC resonance module, the positive electrode of the LED loads is connected with the output positive electrode of the rectifier unit, and the output negative electrode of the rectifier bridge is grounded; and the negative electrode of the LED load is connected with the current-sharing dimming unit.

7. The low-pressure mercury lamp and LED compatible power supply circuit of claim 6, wherein: the current equalizing and dimming unit comprises a triode S, a chip IC and a resistor RS, wherein the collector electrode of the triode S is connected with the negative electrode of the LED load, the emitter electrode of the triode S is connected with the 1 pin of the chip IC and one end of the resistor RS, and the other end of the resistor RS is connected with the 2 pin of the chip IC and grounded; the base of the triode S is connected with the 5 pin of the chip IC.

8. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the control module comprises a voltage and current acquisition unit, a constant current control unit, a constant voltage control unit and an MCU unit, wherein the voltage and current acquisition unit is connected with the BUCK_DC module and the bridge type inversion module and acquires output voltage and output current; the constant current control unit and the constant voltage control unit are both connected with the voltage and current acquisition unit, and the MCU unit is connected with the constant current control unit, the constant voltage control unit, the BUCK_DC module and the bridge type inversion module.

9. The low-pressure mercury lamp and LED compatible power supply circuit of claim 8, wherein: the constant current control unit and the constant voltage control unit comprise a first operational amplifier, a second operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and a diode D, the voltage and current acquisition unit is provided with a sampling resistor, the power-in end of the sampling resistor is connected with one end of the first resistor and the non-inverting input end of the first operational amplifier through the second resistor, and the other end of the first resistor is grounded; the output end of the sampling resistor is connected with the inverting input end of the first operational amplifier and one end of a fourth resistor through a third resistor, the other end of the fourth resistor is connected with the output end of the first operational amplifier and one end of a fifth resistor, the other end of the fifth resistor is connected with the inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier receives a reference voltage through a sixth resistor, and the reference voltage is supplied by an MCU unit or an external circuit; the output end of the second operational amplifier is connected with one end of a seventh resistor and the cathode of the diode D, and the other end of the seventh resistor is connected with the anode of the diode D and the MCU unit.

10. The low-pressure mercury lamp and LED compatible power supply circuit of claim 1, wherein: the temperature detection module detects the temperatures of the BUCK_DC module and the bridge type inversion module and feeds the temperatures back to the control module.