High-power-factor cabinet lamp power supply

Abstract

The utility model, which relates to the power supply field, discloses a high-power-factor cabinet lamp power supply comprising a rectification filtering module used for converting a commercial power voltage into a direct current; compared with the prior art, the beneficial effects of the utility model are that the rectification efficiency and the power factor of the power supply are improved and the electric energy loss is reduced by adopting the filter capacitor and the filter inductor which are made of the full-bridge rectifier and the low-loss material, and the power factor of the power supply is improved by optimizing the design of the power supply, so that the electric energy waste is reduced; the power supply efficiency is improved, and due to the improvement of the power supply efficiency, the energy consumption can be reduced, and the influence on the environment is reduced; by optimizing the power supply design, the temperature in the power supply is reduced, so that the service life of the lamp is prolonged; due to the improvement of the power supply efficiency, a more stable and uniform lighting effect can be provided, and the lighting quality is improved; the modular design is adopted, installation and maintenance are convenient, and the use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of power supplies, in particular to a cabinet lamp power supply with a high power factor. Background Art

[0002] As people's awareness of energy conservation and environmental protection increases, the power factor of lighting equipment has become an increasingly important indicator. As a common lighting device, the power factor of cabinet lights directly affects the effective use of electricity and lighting effects.

[0003] Existing cabinet light power supplies often have a low power factor, resulting in low power utilization and increased energy consumption, which needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide a cabinet light power supply with a high power factor to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A high power factor cabinet light power supply, comprising:

[0007] Rectification and filtering module, used to convert the mains voltage into direct current;

[0008] A power control module is used to control the voltage and current output to the load filter module;

[0009] The load filter module is used to filter the input voltage and current to supply power to the cabinet lights;

[0010] The rectifier filter module is connected to the power control module, and the power control module is connected to the load filter module.

[0011] As a further solution of the utility model: the rectifier and filter module includes a rectifier BD1, a common mode inductor LF1, a common mode inductor L2, and a safety capacitor CX1. The first end of the common mode inductor L2 is connected to one end of the varistor MOV1 and one end of the fuse F1. The second end of the common mode inductor L2 is connected to the other end of the varistor MOV1 and one end of the interface CON1. ​​The other end of the fuse F1 is connected to the other end of the interface CON1. ​​The interface CON1 is externally connected to the mains power supply. The third end of the common mode inductor L2 is connected to one end of the safety capacitor CX1, one end of the resistor R34, and the common mode inductor LF1. The first end of the common-mode inductor L2 is connected to the other end of the safety capacitor CX1 and the second end of the common-mode inductor LX1. The third end of the common-mode inductor LX1 is connected to the first end of the rectifier BD1. The fourth end of the common-mode inductor LX1 is connected to the third end of the rectifier BD1. The fourth end of the rectifier BD1 is grounded. The second end of the rectifier BD1 is connected to one end of the capacitor C1, one end of the resistor R10, and one end of the inductor L3. The other end of the capacitor C1 is grounded. The other end of the inductor L3 is connected to the other end of the resistor R10, one end of the capacitor C2, and the power control module. The other end of the capacitor C2 is grounded.

[0012] As a further solution of the utility model: the power control module includes a field effect tube Q1, a control chip U1, and a transformer T1. The model of the control chip U1 is KP2813ASGA. The first end of the transformer T1 is connected to one end of the resistor R1, one end of the resistor R3, one end of the resistor R4, one end of the capacitor C3, and the rectifier and filter module. The other end of the resistor R1 is connected to the HV pin of the control chip U1 through the resistor R2. The fourth end of the transformer T1 is connected to the positive electrode of the diode D1, the first end of the field effect tube Q1, and one end of the capacitor C6A. The negative electrode of the diode D1 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the other end of the capacitor C3, the other end of the resistor R3, and the other end of the resistor R4. The second end of the field effect tube Q1 is connected to the other end of the capacitor C6A and the resistor RS1. One end, one end of resistor RS2, one end of resistor RS3, one end of resistor R9, one end of resistor R8, the other end of resistor RS1 is grounded, the other end of resistor RS2 is grounded, the other end of resistor RS3 is grounded, the other end of resistor R9 is connected to one end of capacitor C7 and the CS pin of control chip U1, the other end of resistor R8 is connected to the third end of field effect transistor Q1 and one end of resistor R6, the other end of resistor R6 is connected to the cathode of diode D3 and one end of resistor R7, the other end of resistor R7 is connected to the anode of diode D3 and the GATE pin of control chip U1, the FB pin of control chip U1 is connected to one end of capacitor C5, one end of resistor R12, one end of resistor R13, the other end of capacitor C5 is grounded, the other end of resistor R12 is grounded, and the other end of resistor R13 is grounded.

[0013] As a further solution of the utility model: the load filtering module includes a diode D4, an electrolytic capacitor EC4, and an electrolytic capacitor EC5. The positive electrode of the diode D4 is connected to one end of the resistor R15 and the power control module. The negative electrode of the diode D4 is connected to one end of the capacitor C10, one end of the electrolytic capacitor EC4, one end of the electrolytic capacitor EC5, one end of the resistor R22, and a first end of the common-mode inductor L1. The other end of the capacitor C10 is connected to the other end of the resistor R15, the other end of the electrolytic capacitor EC4 is connected to the common point N, the other end of the electrolytic capacitor EC5 is connected to the common point N, the other end of the resistor R22 is connected to the positive electrode of the light-emitting tube LED1, the negative electrode of the light-emitting tube LED1 is connected to the common point N, the second end of the common-mode inductor L1 is connected to the common point N, and the third and fourth ends of the common-mode inductor L1 output voltage to supply the cabinet light.

[0014] As a further solution of the utility model: the common point N is grounded via a capacitor CY1.

[0015] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model improves the rectification efficiency and power factor of the power supply and reduces the power loss by adopting a full-bridge rectifier and filter capacitors and filter inductors made of low-loss materials. By optimizing the power supply design, the power factor of the power supply is improved, thereby reducing the waste of power and improving the power supply efficiency. Due to the improvement of the power supply efficiency, energy consumption can be reduced and the impact on the environment can be reduced; by optimizing the power supply design, the temperature inside the power supply is reduced, thereby extending the life of the lamp; due to the improvement of the power supply efficiency, a more stable and uniform lighting effect can be provided, and the lighting quality is improved; the modular design is adopted, which is convenient for installation and maintenance and reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The following is a circuit diagram of a high power factor cabinet light power supply. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] See also Figure 1 , a high power factor cabinet light power supply, comprising:

[0019] Rectification and filtering module, used to convert the mains voltage into direct current;

[0020] A power control module is used to control the voltage and current output to the load filter module;

[0021] The load filter module is used to filter the input voltage and current to supply power to the cabinet lights;

[0022] The rectifier filter module is connected to the power control module, and the power control module is connected to the load filter module.

[0023] In this example: See Figure 1 The rectifier and filter module includes a rectifier BD1, a common-mode inductor LF1, a common-mode inductor L2, and a safety capacitor CX1. The first end of the common-mode inductor L2 is connected to one end of the varistor MOV1 and one end of the fuse F1. The second end of the common-mode inductor L2 is connected to the other end of the varistor MOV1 and one end of the interface CON1. ​​The other end of the fuse F1 is connected to the other end of the interface CON1. ​​The interface CON1 is externally connected to the AC power supply. The third end of the common-mode inductor L2 is connected to one end of the safety capacitor CX1, one end of the resistor R34, and the first end of the common-mode inductor LF1. The fourth end of the inductor L2 is connected to the other end of the safety capacitor CX1 and the second end of the common-mode inductor LX1, the third end of the common-mode inductor LX1 is connected to the first end of the rectifier BD1, the fourth end of the common-mode inductor LX1 is connected to the third end of the rectifier BD1, the fourth end of the rectifier BD1 is grounded, the second end of the rectifier BD1 is connected to one end of the capacitor C1, one end of the resistor R10, and one end of the inductor L3, the other end of the capacitor C1 is grounded, the other end of the inductor L3 is connected to the other end of the resistor R10, one end of the capacitor C2, and the power control module, and the other end of the capacitor C2 is grounded.

[0024] The interface CON1 can be a common two-hole socket, which introduces the mains power supply. A varistor MOV1 is connected between the live wire and the neutral wire. When the line voltage is higher than the action value of the varistor MOV1, the impedance of the varistor MOV1 suddenly decreases, showing a conduction phenomenon, which can release the overvoltage; when the voltage returns to the closing value, the impedance of the varistor MOV1 suddenly becomes very large, and the original conduction release circuit is closed, which can play a role in overvoltage protection. Then, the common mode inductor L2, the safety capacitor CX1, and the common mode inductor LF1 form a filter circuit to filter the mains power, which can absorb most of the AC interference signals and convert them into magnetic induction and heat energy to ensure the clarity and accuracy of the signal. The rectifier bridge BD1 then converts the AC power into the DC power required by the circuit. After rectification, it is further filtered through the LC filter circuit composed of CBB capacitors C1, C2 and differential mode inductor L3.

[0025] In this example: See Figure 1The power control module includes a field effect tube Q1, a control chip U1, and a transformer T1. The model of the control chip U1 is KP2813ASGA. The first end of the transformer T1 is connected to one end of the resistor R1, one end of the resistor R3, one end of the resistor R4, one end of the capacitor C3, and the rectifier filter module. The other end of the resistor R1 is connected to the HV pin of the control chip U1 through the resistor R2. The fourth end of the transformer T1 is connected to the positive electrode of the diode D1, the first end of the field effect tube Q1, and one end of the capacitor C6A. The negative electrode of the diode D1 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the other end of the capacitor C3, the other end of the resistor R3, and the other end of the resistor R4. The second end of the field effect tube Q1 is connected to the other end of the capacitor C6A, one end of the resistor RS1, and the resistor RS 2, one end of resistor RS3, one end of resistor R9, one end of resistor R8, the other end of resistor RS1 is grounded, the other end of resistor RS2 is grounded, the other end of resistor RS3 is grounded, the other end of resistor R9 is connected to one end of capacitor C7 and the CS pin of control chip U1, the other end of resistor R8 is connected to the third end of field effect transistor Q1 and one end of resistor R6, the other end of resistor R6 is connected to the cathode of diode D3 and one end of resistor R7, the other end of resistor R7 is connected to the anode of diode D3 and the GATE pin of control chip U1, the FB pin of control chip U1 is connected to one end of capacitor C5, one end of resistor R12, one end of resistor R13, the other end of capacitor C5 is grounded, the other end of resistor R12 is grounded, and the other end of resistor R13 is grounded.

[0026] The voltage is supplied to the HV pin of the control chip U1 through the starting resistors R1 and R2, providing a high-voltage starting voltage for the control chip U1 to work. The control chip U1 controls whether the field effect tube Q1 is turned on by controlling the voltage of the third terminal of the field effect tube Q1, thereby changing the conduction frequency of the transformer T1 and changing the voltage and current on the coil of the transformer T1. The diode D3 can prevent the output power of the driving pin GATE of the control chip U1 from being too large to damage the field effect tube Q1. The resistors RS1, RS2, and RS3 are used as current sampling resistors of the current sampling terminal CS pin of the control chip U1. By adjusting the size of the resistors RS1, RS2, and RS3, the output current (maximum value) of the power control module can be set. The second primary winding (second end, fifth end) of transformer T1 is connected to the VDD pin of control chip U1 through diode D2 and resistor R20, providing low voltage startup voltage for control chip U1; and the winding is also connected to the feedback voltage pin FB of control chip U1 through resistor R14, and the output constant voltage value of the power control module can be set by adjusting the size of the resistors R12 and R13 of the pin to ground. The control chip model is KP2813ASGA, which is a high power factor, low total harmonic distortion, primary side control flyback constant voltage controller with built-in high voltage startup circuit, which can meet the requirements of fast startup and low standby; using its characteristics, the layout of external devices can be greatly reduced; using quasi-resonant working mode, the system has high working efficiency and good EMC performance; the minimum operating frequency can be set to ensure the stability of the system output voltage under full load range conditions and meet the requirements of low standby loss.

[0027] In this example: See Figure 1 The load filtering module includes a diode D4, an electrolytic capacitor EC4, and an electrolytic capacitor EC5. The positive electrode of the diode D4 is connected to one end of the resistor R15 and the power control module. The negative electrode of the diode D4 is connected to one end of the capacitor C10, one end of the electrolytic capacitor EC4, one end of the electrolytic capacitor EC5, one end of the resistor R22, and a first end of the common-mode inductor L1. The other end of the capacitor C10 is connected to the other end of the resistor R15, the other end of the electrolytic capacitor EC4 is connected to a common point N, the other end of the electrolytic capacitor EC5 is connected to a common point N, the other end of the resistor R22 is connected to the positive electrode of the light-emitting tube LED1, the negative electrode of the light-emitting tube LED1 is connected to the common point N, the second end of the common-mode inductor L1 is connected to the common point N, and the third and fourth ends of the common-mode inductor L1 output voltage to supply the cabinet light.

[0028] In this example: See Figure 1 , the common point N is grounded through capacitor CY1.

[0029] After the system is powered off, resistors R18 and R19 can discharge capacitors EC4 and EC5 to eliminate the afterglow of the lamp. The positive pole of the secondary winding (common point A) of the transformer T1 is rectified by the rectifier diode D4, filtered by electrolytic capacitors EC4 and EC5, and then load filtered by the common mode inductor L1 to power the cabinet lamp. The light-emitting diode LED1 is used as an indicator light. If the light is on, it means that the power output is normal, otherwise the power supply is abnormal.

[0030] The working principle of the utility model is: the rectifier filter module is used to convert the mains voltage into direct current; the power control module is used to control the voltage and current output to the load filter module; the load filter module is used to filter the input voltage and current to supply power to the cabinet light.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0032] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high power factor cabinet light power supply, characterized in that: This high power factor cabinet light power supply includes: Rectification and filtering module, used to convert the mains voltage into direct current; A power control module is used to control the voltage and current output to the load filter module; The load filter module is used to filter the input voltage and current to supply power to the cabinet lights; The rectifier filter module is connected to the power control module, and the power control module is connected to the load filter module.

2. The high power factor cabinet light power supply according to claim 1, characterized in that: The rectifier and filter module includes a rectifier BD1, a common-mode inductor LF1, a common-mode inductor L2, and a safety capacitor CX1. The first end of the common-mode inductor L2 is connected to one end of the varistor MOV1 and one end of the fuse F1. The second end of the common-mode inductor L2 is connected to the other end of the varistor MOV1 and one end of the interface CON1. ​​The other end of the fuse F1 is connected to the other end of the interface CON1. ​​The interface CON1 is externally connected to the mains power supply. The third end of the common-mode inductor L2 is connected to one end of the safety capacitor CX1, one end of the resistor R34, and the first end of the common-mode inductor LF1. The fourth end of inductor L2 is connected to the other end of safety capacitor CX1 and the second end of common-mode inductor LX1, the third end of common-mode inductor LX1 is connected to the first end of rectifier BD1, the fourth end of common-mode inductor LX1 is connected to the third end of rectifier BD1, the fourth end of rectifier BD1 is grounded, the second end of rectifier BD1 is connected to one end of capacitor C1, one end of resistor R10, and one end of inductor L3, the other end of capacitor C1 is grounded, the other end of inductor L3 is connected to the other end of resistor R10, one end of capacitor C2, and the power control module, and the other end of capacitor C2 is grounded.

3. The high power factor cabinet light power supply according to claim 1, characterized in that: The power control module includes a field effect tube Q1, a control chip U1, and a transformer T1. The model of the control chip U1 is KP2813ASGA. The first end of the transformer T1 is connected to one end of the resistor R1, one end of the resistor R3, one end of the resistor R4, one end of the capacitor C3, and the rectifier filter module. The other end of the resistor R1 is connected to the HV pin of the control chip U1 through the resistor R2. The fourth end of the transformer T1 is connected to the positive electrode of the diode D1, the first end of the field effect tube Q1, and one end of the capacitor C6A. The negative electrode of the diode D1 is connected to one end of the resistor R5. The other end of the resistor R5 is connected to the other end of the capacitor C3, the other end of the resistor R3, and the other end of the resistor R4. The second end of the field effect tube Q1 is connected to the other end of the capacitor C6A, one end of the resistor RS1, and the resistor RS2 One end of resistor RS3, one end of resistor R9, one end of resistor R8, the other end of resistor RS1 is grounded, the other end of resistor RS2 is grounded, the other end of resistor RS3 is grounded, the other end of resistor R9 is connected to one end of capacitor C7 and the CS pin of control chip U1, the other end of resistor R8 is connected to the third end of field effect transistor Q1 and one end of resistor R6, the other end of resistor R6 is connected to the cathode of diode D3 and one end of resistor R7, the other end of resistor R7 is connected to the anode of diode D3 and the GATE pin of control chip U1, the FB pin of control chip U1 is connected to one end of capacitor C5, one end of resistor R12, one end of resistor R13, the other end of capacitor C5 is grounded, the other end of resistor R12 is grounded, and the other end of resistor R13 is grounded.

4. The high power factor cabinet light power supply according to claim 1, characterized in that: The load filtering module includes a diode D4, an electrolytic capacitor EC4, and an electrolytic capacitor EC5. The positive electrode of the diode D4 is connected to one end of the resistor R15 and the power control module. The negative electrode of the diode D4 is connected to one end of the capacitor C10, one end of the electrolytic capacitor EC4, one end of the electrolytic capacitor EC5, one end of the resistor R22, and a first end of the common-mode inductor L1. The other end of the capacitor C10 is connected to the other end of the resistor R15, the other end of the electrolytic capacitor EC4 is connected to a common point N, the other end of the electrolytic capacitor EC5 is connected to a common point N, the other end of the resistor R22 is connected to the positive electrode of the light-emitting tube LED1, the negative electrode of the light-emitting tube LED1 is connected to the common point N, the second end of the common-mode inductor L1 is connected to the common point N, and the third and fourth ends of the common-mode inductor L1 output voltage to supply the cabinet light.

5. The high power factor cabinet light power supply according to claim 4, characterized in that: The common point N is grounded via a capacitor CY1.

Images