CN212064450U

CN212064450U - 0-10V dimming stroboflash-free power supply circuit with auxiliary power supply

Info

Publication number: CN212064450U
Application number: CN202020710261.3U
Authority: CN
Inventors: 丁敏
Original assignee: Shanghai Euchips Industrial Co ltd
Current assignee: Shanghai Euchips Industrial Co ltd
Priority date: 2020-05-04
Filing date: 2020-05-04
Publication date: 2020-12-01
Anticipated expiration: 2030-05-04

Abstract

The utility model discloses a 0-10V adjusts luminance and takes auxiliary power supply's no stroboscopic power supply circuit relates to LED drive circuit technical field. The power supply circuit obtains 220V alternating current voltage from commercial power, the alternating current voltage is processed by an EMI circuit and then converted into direct current voltage by a rectifying circuit to be supplied to a single-stage PFC flyback circuit, meanwhile, an active passive bleeder circuit works, the single-stage PFC flyback circuit can generate a 100KHz high-frequency PWM signal to control the on and off of an MOS (metal oxide semiconductor) tube, chopping is carried out on high-voltage direct current, and the high-voltage direct current is transmitted to a secondary side through transformer coupling, so that a stable DC constant voltage power supply is provided for a secondary BUCK. The BUCK constant-current circuit converts a DC constant-voltage power supply into a constant-current output power supply, the magnitude of output current depends on a voltage signal of 0-10V, the output current is converted into 1% -100% PWM duty ratio through a dimming circuit, the magnitude of the output current is controlled, and meanwhile a 12V auxiliary power supply is output.

Description

0-10V dimming stroboflash-free power supply circuit with auxiliary power supply

Technical Field

The utility model relates to a LED power technical field especially relates to a 0-10V adjusts luminance and takes auxiliary power source's no stroboscopic power supply circuit.

Background

LED lighting is currently increasingly required for brightness control (dimming). The phase-cut dimming mode is a dimming mode of a traditional light source (an incandescent lamp and a resistive load), controls the size of output voltage through the phase angle of input voltage, and is low in cost, convenient to wire and extremely wide in application. However, when the LED power source (capacitive load) is connected, compatibility problems such as various lamp flashes, insufficient dimming depth, and unsmooth dimming curve may be caused. A special chip scheme appears in the prior art, can automatically detect the type of an input light modulator, and is compatible with various light modulators. However, due to the single-stage scheme, the ripple of the low end of the output current is large, and the dimming depth is difficult to break through 1%.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem how to provide a programmable maximum dimming voltage, minimum duty cycle, turn-off function and PWM output frequency range, the smooth not stroboscopic power supply circuit of process of adjusting luminance.

In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the utility model provides a 0-10V adjusts luminance and does not have stroboscopic power supply circuit of taking auxiliary power supply which characterized in that: the power supply comprises an EMI circuit, wherein the input end of the EMI circuit is connected with a mains supply, the output end of the EMI circuit is connected with the input end of a rectifying circuit, and the rectifying circuit is used for converting an input alternating current mains supply into a direct current; the output end of the rectification circuit is connected with the input end of a single-stage PFC flyback circuit through an active and passive bleeder circuit, the output end of the single-stage PFC flyback circuit is connected with the primary side of an isolation transformer, the single-stage PFC flyback circuit is used for generating a 100KHz high-frequency PWM signal and controlling the on and off of an MOS in the isolation transformer, chopping is carried out on high-voltage direct current and then is transmitted to the secondary side through transformer coupling, and a stable DC constant-voltage power supply is provided for a secondary side BUCK constant-current circuit; one secondary side of the isolation transformer is connected with the input end of the 12V auxiliary power supply, the other secondary side of the isolation transformer is connected with the input end of the DC constant voltage power supply, and the DC constant current circuit is used for converting the power supply into a constant current output power supply; the output end of the DC constant-voltage power supply is connected with the input end of the BUCK constant-current adjustable circuit, the output end of the BUCK constant-current adjustable circuit is connected with the power supply input end of the LED lighting equipment, and the output end of the 0-10V signal conversion circuit is connected with the other input end of the BUCK constant-current adjustable circuit.

The further technical scheme is as follows: one output end of the rectifying circuit is grounded, the other output end of the rectifying circuit is divided into three paths, the first path is grounded through a capacitor C1, the second path is connected with one end of an inductor L3, the third path sequentially passes through a resistor R6 and one end of a capacitor C2, the other end of the inductor L3 is divided into six paths, the first path is connected with one end of a resistor R6 and one end of a capacitor C2, the second path is connected with a power supply VDD after sequentially passing through a resistor R13, a resistor R69 and a resistor R70, the third path is connected with the negative electrode of a diode D5 through a capacitor C3, the fourth path is connected with the negative electrode of a diode D5 through a capacitor C4, the fifth path is connected with the negative electrode of a diode D5 after sequentially passing through a resistor R61 and a resistor R62, a resistor R63 is connected in parallel with a resistor R31, a resistor R64 is connected in parallel;

the anode of the diode D5 is connected with the 3 pin of the T1 through a resistor R66, the resistor R65 is connected in parallel with a resistor R66, the 5 pin of the T1 is divided into two paths, the first path is connected with one end of a resistor R15, the second path is grounded after sequentially passing through a diode D6 and a resistor R14, the anode of the diode D7 is grounded, the cathode of the diode D7 is connected with a power supply VDD, the 4 pin of the T1 is grounded, the other end of the resistor R15 is divided into three paths, the first path is connected with a VSEN pin of the chip U1, the second path is grounded through a capacitor C11, the third path is grounded through a resistor R17, the DRV pin of the U1 is connected with one end of a resistor R19, the other end of the resistor R19 is divided into two paths, the first path is connected with the gate of the field effect transistor Q4 through a diode D8, the second path is connected with the gate of the field effect transistor Q4 through a resistor R20, and the;

the 11 pins of the T1 are divided into two paths, the first path is connected with the anode of a diode D9, the second path is connected with one end of a capacitor C14, diodes D10 and D11 are connected with a diode D9 in parallel, the cathode of a diode D9 is connected with the other end of a capacitor C14 through a resistor R26, a resistor R27 is connected with a resistor R26 in parallel, the junction of the resistor R26 and the diode D9 is divided into four paths, the first path is connected with the 12 pins of the T1 through a capacitor CE2, the second path is connected with the 12 pins of the T1 through a resistor R28, the third path is connected with the VIN pin of a chip U2 through a resistor R35 and a voltage regulator ZD1 in sequence, and the fourth path is connected with the drain of a field effect transistor; the ZCS pin of the U2 is divided into three paths, the first path is grounded through a capacitor C16, the second path is grounded through a resistor R30, the third path is grounded through a diode D12 and a resistor R31 in sequence and then is connected with the collector of a triode Q3, the COMP pin of the U2 is grounded through a capacitor C17 and a resistor R36 in sequence, the GND pin of the U2 is grounded, the ADM pin of the U2 is grounded through a capacitor C19, the VDR pin of the U2 is connected with the gate of a field effect tube Q2 through a resistor R37, the ken pin of the U2 is divided into three paths, the first path is grounded through a capacitor C20, the second path is grounded through a capacitor C21, the third path is connected with one end of a resistor R39, the other end of the resistor R39 is divided into two paths, the first path is grounded through a resistor R43, the second path is connected with the gate of the field effect tube Q2, one end of an inductor L2 is connected with a node of the LED + junction;

the 8 th pin of the T1 is connected with one end of a resistor R45 through a diode D17, the other end of the resistor R45 is divided into three paths, the first path is connected with the 7 th pin of the T1 through a capacitor CE5, the second path is connected with the base of a triode Q4 through a resistor R46, the third path is connected with the collector of a triode Q4, the base of a triode Q4 is connected with the 7 th pin of the T1 through a diode ZD3, the emitter of the triode Q4 is divided into six paths, the first path is connected with the 7 th pin of the T1 through a capacitor C23, the second path is connected with the emitter of the triode Q5, the third path is connected with the base of the triode Q5 through a capacitor C5, the fourth path is connected with the base of the triode Q5 through a capacitor C5, the fifth path is connected with the emitter of the triode Q5, the sixth path is connected with one end of a capacitor R5, the base of the triode Q5 is connected with the collector of the triode Q5 through a resistor R5, and the collector of, a collector of the triode Q6 is connected with the pin 7 of the T1 through a resistor R50, a node between the collector of the triode Q6 and the resistor R51 is a 12V + output end, and the pin 7 of the T1 is a 12V-output end;

the 10 feet of transformer T1 divide into two the tunnel, and the VIN pin of first road and chip U3 is connected, and the second road is earthed after resistance R54 and resistance R59 in proper order, the DRV pin of chip U3 is connected through resistance R56 and opto-coupler U4's emitting diode's positive pole, chip U3's DIM pin divide into two the tunnel, and the first road is earthed through electric capacity C27, and the second road is connected with an input of common mode inductance T2XB, chip U3's CF pin is earthed through electric capacity C28, and two output terminals of common mode inductance T2XB are DIM + output and DIM-output.

Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the power supply circuit obtains 220V alternating current voltage from commercial power, the alternating current voltage is processed by an EMI circuit and then converted into direct current voltage by a rectifying circuit to be supplied to a single-stage PFC flyback circuit, meanwhile, an active passive bleeder circuit works, the single-stage PFC flyback circuit can generate a 100KHz high-frequency PWM signal to control the on and off of an MOS (metal oxide semiconductor) tube, chopping is carried out on high-voltage direct current, and the high-voltage direct current is transmitted to a secondary side through transformer coupling, so that a stable DC constant voltage power supply is provided for a secondary BUCK. The BUCK constant-current circuit converts a DC constant-voltage power supply into a constant-current output power supply, the magnitude of output current depends on a voltage signal of 0-10V, the output current is converted into 1% -100% PWM duty ratio through a dimming circuit, the magnitude of the output current is controlled, and meanwhile a 12V auxiliary power supply is output.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a schematic block diagram of a power circuit according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a power circuit according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a 12V self-locking short-circuit protection circuit of an auxiliary power supply in a power circuit according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a 0-10V signal conversion circuit in the power circuit according to the embodiment of the present invention;

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

As shown in fig. 1, the embodiment of the utility model discloses a 0-10V dimming stroboflash-free power supply circuit with an auxiliary power supply, which comprises an EMI circuit, wherein the input end of the EMI circuit is connected with the mains supply, the output end of the EMI circuit is connected with the input end of a rectifying circuit, and the rectifying circuit is used for converting the input ac mains supply into a dc power; the output end of the rectification circuit is connected with the input end of a single-stage PFC flyback circuit through an active and passive bleeder circuit, the output end of the single-stage PFC flyback circuit is connected with the primary side of an isolation transformer, the single-stage PFC flyback circuit is used for generating a 100KHz high-frequency PWM signal and controlling the on and off of an MOS in the isolation transformer, chopping is carried out on high-voltage direct current and then is transmitted to the secondary side through transformer coupling, and a stable DC constant-voltage power supply is provided for a secondary side BUCK constant-current circuit; one secondary side of the isolation transformer is connected with the input end of the 12V auxiliary power supply, the other secondary side of the isolation transformer is connected with the input end of the DC constant voltage power supply, and the DC constant current circuit is used for converting the power supply into a constant current output power supply; the output end of the DC constant-voltage power supply is connected with the input end of the BUCK constant-current adjustable circuit, the output end of the BUCK constant-current adjustable circuit is connected with the power supply input end of the LED lighting equipment, and the output end of the 0-10V signal conversion circuit is connected with the other input end of the BUCK constant-current adjustable circuit.

The power supply circuit obtains 220V alternating current voltage from commercial power, the alternating current voltage is processed by an EMI circuit and then converted into direct current voltage by a rectifying circuit to be supplied to a single-stage PFC flyback circuit, meanwhile, an active passive bleeder circuit works, the single-stage PFC flyback circuit can generate a 100KHz high-frequency PWM signal to control the on and off of an MOS (metal oxide semiconductor) tube, chopping is carried out on high-voltage direct current, and the high-voltage direct current is transmitted to a secondary side through transformer coupling, so that a stable DC constant voltage power supply is provided for a secondary BUCK. The BUCK constant-current circuit converts a DC constant-voltage power supply into a constant-current output power supply, the magnitude of output current depends on a voltage signal of 0-10V, the output current is converted into 1% -100% PWM duty ratio through a dimming circuit, the magnitude of the output current is controlled, and meanwhile a 12V auxiliary power supply is output.

as shown in fig. 3, the pin 8 of the T1 is connected to one end of a resistor R45 through a diode D17, the other end of the resistor R45 is divided into three paths, the first path is connected to the pin 7 of the T1 through a capacitor CE5, the second path is connected to the base of a transistor Q4 through a resistor R46, the third path is connected to the collector of a transistor Q4, the base of a transistor Q4 is connected to the pin 7 of the T1 through a diode ZD3, the emitter of a transistor Q4 is divided into six paths, the first path is connected to the pin 7 of the T1 through a capacitor C23, the second path is connected to the emitter of a transistor Q5, the third path is connected to the base of the transistor Q5 through a capacitor C5, the fourth path is connected to the base of the transistor Q5 through a capacitor C5, the fifth path is connected to the emitter of the transistor Q5, the sixth path is connected to one end of the capacitor R5, the base of the transistor Q5 is connected to the collector of the transistor Q5 through a resistor R5, a collector of the triode Q6 is connected with the pin 7 of the T1 through a resistor R50, a node between the collector of the triode Q6 and the resistor R51 is a 12V + output end, and the pin 7 of the T1 is a 12V-output end; the capacitor CE5 is filtered after the diode D17 is rectified, 12V output is stabilized after the LDO, the voltage at two ends of the capacitor C2 cannot suddenly change, the base voltage of the triode Q5 starts to drop from VCC and can be conducted when the base voltage drops to the triode Q5, meanwhile, the conduction of the triode Q6 is prevented, the triode Q6 is conducted after 0.17ms, the load is electrified, the collector voltage of the triode Q6 reaches high potential, and the triode Q5 is forced to be cut off. When short circuit occurs, the collector of the triode Q6 is pulled down, the triode Q5 is conducted to form self-locking, the triode Q6 is forced to be cut off, and the load has no voltage after the triode Q6 is cut off, so that short circuit protection is realized.

As shown in fig. 4, the 10 pins of the transformer T1 are divided into two paths, the first path is connected to a VIN pin of a chip U3, the second path is grounded after passing through a resistor R54 and a resistor R59 in sequence, a DRV pin of the chip U3 is connected to an anode of a light emitting diode of an optocoupler U4 through a resistor R56, a DIM pin of the chip U3 is divided into two paths, the first path is grounded through a capacitor C27, the second path is connected to an input terminal of a common mode inductor T2XB, a CF pin of the chip U3 is grounded through a capacitor C28, and two output terminals of the common mode inductor T2XB are a DIM + output terminal and a DIM-output terminal. The dimming circuit: the 0-10V dimming signal is converted into a 1% -100% PWM duty ratio to be output, the dimming signal is provided for the constant current BUCK driver, and dimming is directly performed without a transformer or other driving circuits.

Claims

1. The utility model provides a 0-10V adjusts luminance and does not have stroboscopic power supply circuit of taking auxiliary power supply which characterized in that: the power supply comprises an EMI circuit, wherein the input end of the EMI circuit is connected with a mains supply, the output end of the EMI circuit is connected with the input end of a rectifying circuit, and the rectifying circuit is used for converting an input alternating current mains supply into a direct current; the output end of the rectification circuit is connected with the input end of a single-stage PFC flyback circuit through an active and passive bleeder circuit, the output end of the single-stage PFC flyback circuit is connected with the primary side of an isolation transformer, the single-stage PFC flyback circuit is used for generating a 100KHz high-frequency PWM signal and controlling the on and off of an MOS in the isolation transformer, chopping is carried out on high-voltage direct current and then is transmitted to the secondary side through transformer coupling, and a stable DC constant-voltage power supply is provided for a secondary side BUCK constant-current circuit; one secondary side of the isolation transformer is connected with the input end of the 12V auxiliary power supply, the other secondary side of the isolation transformer is connected with the input end of the DC constant voltage power supply, and the DC constant current circuit is used for converting the power supply into a constant current output power supply; the output end of the DC constant-voltage power supply is connected with the input end of the BUCK constant-current adjustable circuit, the output end of the BUCK constant-current adjustable circuit is connected with the power supply input end of the LED lighting equipment, and the output end of the 0-10V signal conversion circuit is connected with the other input end of the BUCK constant-current adjustable circuit.

2. The 0-10V dimming strobeless power supply circuit with auxiliary power supply of claim 1, wherein: one output end of the rectifying circuit is grounded, the other output end of the rectifying circuit is divided into three paths, the first path is grounded through a capacitor C1, the second path is connected with one end of an inductor L3, the third path sequentially passes through a resistor R6 and one end of a capacitor C2, the other end of the inductor L3 is divided into six paths, the first path is connected with one end of a resistor R6 and one end of a capacitor C2, the second path is connected with a power supply VDD after sequentially passing through a resistor R13, a resistor R69 and a resistor R70, the third path is connected with the negative electrode of a diode D5 through a capacitor C3, the fourth path is connected with the negative electrode of a diode D5 through a capacitor C4, the fifth path is connected with the negative electrode of a diode D5 after sequentially passing through a resistor R61 and a resistor R62, a resistor R63 is connected in parallel with a resistor R31, a resistor R64 is connected in parallel;