Quick starting circuit based on DALI and constant-voltage power supply

Abstract

The utility model provides a quick start circuit based on a DALI protocol. The quick start circuit based on the DALI protocol comprises a power correction rectification input module, a quick start module and a main control chip. The quick starting module is composed of a starting circuit and a closing circuit. After the power supply is powered on, the starting circuit enables the first electronic switching tube to be quickly conducted through the first energy storage capacitor and provides enough starting voltage for the main control chip so as to meet the requirement of a DALI protocol for quick starting time. And after the main control chip works normally, the closing circuit drives the first electronic switching tube to be cut off, and the quick start circuit is cut off, so that the power consumption of the quick start circuit based on the DALI protocol is reduced. Besides, the bleeder resistor in the circuit provides a discharge path for the first electrolytic capacitor, so that the first electrolytic capacitor can discharge quickly after the external power supply is powered off, the quick start circuit can respond quickly during next start, and the requirement of the DALI protocol for secondary start time is met.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of LED power supply, in particular to a fast start circuit based on DALI and a constant voltage power supply. BACKGROUND

[0002] In the rapid development of today's intelligent lighting system, DALI dimming protocol has become the preferred communication protocol in many LED lighting applications due to its excellent flexibility and scalability. The protocol not only requires LED power supply to accurately respond to dimming instructions, but also puts forward very high requirements on its start and response speed to ensure the immediacy and stability of the lighting system. Therefore, the realization of the fast start function in the design of the LED power supply is particularly important.

[0003] However, in actual engineering practice, although some master control chips have built-in fast start function pins, there are still a large number of master control chips without this function on the market, so designers must rely on external fast start circuits to meet the requirements of DALI protocol. And the design of the external fast start circuit not only ensures that the power supply can start quickly, but also can be efficiently turned off after the chip starts to reduce the power consumption of the starting resistor, so as to meet the overall efficiency requirements of the power supply. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a fast and twice start circuit based on DALI and a constant voltage power supply.

[0005] The purpose of the present disclosure is achieved by the following technical solutions:

[0006] A fast start circuit based on DALI, comprising a power correction rectifier input module, a fast start module and a master control chip.

[0007] The power correction rectifier input module is used to provide power for the fast start module.

[0008] The fast start module comprises a start circuit and a shutdown circuit, the start circuit comprises a first electronic switch tube, a first current limiting resistor, a second current limiting resistor, a first energy storage capacitor and a first electrolytic capacitor, the first end of the first current limiting resistor is used to connect with the external power supply end, the second end of the first current limiting resistor is connected with the control end of the first electronic switch tube, the first end of the second current limiting resistor is used to connect with the external power supply end, the second end of the second current limiting resistor is connected with the first end of the first electronic switch tube, the positive electrode of the first electrolytic capacitor is connected with the second end of the first electronic switch tube, the negative electrode of the first electrolytic capacitor is grounded, the first end of the first energy storage capacitor is connected with the control end of the first electronic switch tube, and the second end of the first energy storage capacitor is grounded.

[0009] The closing circuit comprises a second electronic switch tube, a second electrolytic capacitor, a second energy storage capacitor, a first voltage stabilizing diode and a bleeder resistor, the positive pole of the second electrolytic capacitor and the negative pole of the first voltage stabilizing diode are both connected with the second end of the first electronic switch tube, the negative pole of the second electrolytic capacitor is grounded, the positive pole of the first voltage stabilizing diode is connected with the control end of the second electronic switch tube, the first end of the second electronic switch tube is connected with the control end of the first electronic switch tube, the second end of the second electronic switch tube is grounded, the first end of the second energy storage capacitor is connected with the control end of the second electronic switch tube, the second end of the second energy storage capacitor is grounded, the first end of the bleeder resistor is connected with the positive pole of the first electrolytic capacitor, and the second end of the bleeder resistor is grounded.

[0010] The power input end of the master control chip is connected with the positive pole of the first electrolytic capacitor, and the master control chip is used for controlling the power correction rectifier input module and the fast starting module to normally work.

[0011] In one of the embodiments, the starting circuit further comprises a first voltage dividing resistor, the first end of the first voltage dividing resistor is used for being connected with the power supply end of the external power supply, and the second end of the first voltage dividing resistor is connected with the first end of the first current limiting resistor.

[0012] In one of the embodiments, the starting circuit further comprises a second voltage dividing resistor, the first end of the second voltage dividing resistor is used for being connected with the power supply end of the external power supply, and the second end of the second voltage dividing resistor is connected with the first end of the second current limiting resistor.

[0013] In one of the embodiments, the starting circuit further comprises a second voltage stabilizing diode, the negative pole of the second voltage stabilizing diode is connected with the control end of the first electronic switch tube, and the positive pole of the second voltage stabilizing diode is grounded.

[0014] In one of the embodiments, the starting circuit further comprises a first rectifier diode, the negative pole of the first rectifier diode is connected with the positive pole of the first electrolytic capacitor, and the positive pole of the first rectifier diode is connected with the positive pole of the second electrolytic capacitor.

[0015] In one of the embodiments, the closing circuit further comprises a second rectifier diode, the negative pole of the second rectifier diode is connected with the positive pole of the second electrolytic capacitor, and the positive pole of the second rectifier diode is used for being connected with the power supply variable transformer secondary side of the power correction rectifier input module.

[0016] In one of the embodiments, the closing circuit further comprises a third voltage dividing resistor, the first end of the third voltage dividing resistor is connected with the positive pole of the first voltage stabilizing diode, and the second end of the third voltage dividing resistor is grounded.

[0017] In one of the embodiments, the power correction rectifier input module comprises a rectifier bridge circuit and a filter capacitor, the input end of the rectifier bridge circuit is used for connecting with the external power supply end, the output end of the rectifier bridge circuit is connected with the input end of the fast start module, the first end of the filter capacitor is connected with the output end of the rectifier bridge circuit, and the second end of the filter capacitor is grounded.

[0018] In one of the embodiments, the discharge resistance is an adjustable resistance

[0019] A constant voltage power supply comprises the DALI-based fast start circuit of any one of the above.

[0020] Compared with the prior art, the present disclosure has at least the following advantages:

[0021] 1. The DALI-based fast start circuit loads the first energy storage capacitor through the first current-limiting resistor after the power supply is connected to the power, so that the first energy storage capacitor can quickly charge the control end of the first electronic switch tube, so that the first electronic switch tube can be quickly turned on, and then the main control chip obtains sufficient start voltage and meets the requirement of the DALI protocol on the fast start time.

[0022] 2. When the main control chip works normally, the input end voltage of the fast start module is loaded to the control end of the second electronic switch tube, so that the second electronic switch tube is turned on and the control end voltage of the first electronic switch tube is pulled down, so that the first electronic switch tube is cut off and the fast start circuit is cut off, thereby reducing the power consumption of the DALI-based fast start circuit and improving the energy efficiency of the DALI-based fast start circuit.

[0023] 3. In addition, the discharge resistance provides a discharge path for the first electrolytic capacitor, so that the first electrolytic capacitor can be quickly discharged after the external power supply end is powered off, so that the fast start circuit can quickly respond when starting next time, thereby meeting the requirement of the DALI protocol on the secondary start time. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present disclosure, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0025] Figure 1 It is a circuit diagram of the DALI-based fast start circuit of an embodiment. DETAILED DESCRIPTION

[0026] For the purpose of clarity, the present disclosure will be described with reference to the accompanying drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be realized in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the present disclosure to those skilled in the art.

[0027] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. The terms "vertical", "horizontal", "left", "right" and similar expressions as used herein are for illustrative purposes only and are not meant to be limiting.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used in the description of the disclosure herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0029] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure will be further described in detail below in combination with specific embodiments:

[0030] As shown in the figure, the fast start circuit 10 based on DALI of an embodiment of the present disclosure includes a power correction rectifier input module 100, a fast start module 200 and a master control chip 300. Figure 1

[0031] The power correction rectifier input module 100 is used to provide power for the fast start module 200.

[0032] The fast start module 200 includes a start circuit 210 and a shutdown circuit 220. The start circuit 210 includes a first electronic switch tube Q4, a first current limiting resistor R2, a second current limiting resistor R4, a first energy storage capacitor C3 and a first electrolytic capacitor CE3. The first end of the first current limiting resistor R2 is used to be connected with an external power supply terminal. The second end of the first current limiting resistor R2 is connected with the control end of the first electronic switch tube Q4. The first end of the second current limiting resistor R4 is used to be connected with an external power supply terminal. The second end of the second current limiting resistor R4 is connected with the first end of the first electronic switch tube Q4. The positive electrode of the first electrolytic capacitor CE3 is connected with the second end of the first electronic switch tube Q4. The negative electrode of the first electrolytic capacitor CE3 is grounded. The first end of the first energy storage capacitor C3 is connected with the control end of the first electronic switch tube Q4. The second end of the first energy storage capacitor C3 is grounded. ​

[0033] The closing circuit 220 comprises a second electronic switch tube Q5, a second electrolytic capacitor CE2, a second energy storage capacitor C2, a first voltage stabilizing diode ZD2 and a bleeder resistor R6. The positive pole of the second electrolytic capacitor CE2 and the negative pole of the first voltage stabilizing diode ZD2 are both connected to the second end of the first electronic switch tube Q4, the negative pole of the second electrolytic capacitor CE2 is grounded, the positive pole of the first voltage stabilizing diode ZD2 is connected to the control end of the second electronic switch tube Q5, the first end of the second electronic switch tube Q5 is connected to the control end of the first electronic switch tube Q4, the second end of the second electronic switch tube Q5 is grounded, the first end of the second energy storage capacitor C2 is connected to the control end of the second electronic switch tube Q5, the second end of the second energy storage capacitor C2 is grounded, and the first end of the bleeder resistor R6 is connected to the positive pole of the first electrolytic capacitor CE3, and the second end of the bleeder resistor R6 is grounded.

[0034] The power input end of the main control chip 300 is connected to the positive pole of the first electrolytic capacitor CE3, and the main control chip 300 is used to control the power correction rectifier input module 100 and the fast start module 200 to work normally.

[0035] In the embodiment, when the voltage output by the external power supply is stable, the current flows through the first current-limiting resistor R2, and then the current flows to the first energy storage capacitor C3, and the first energy storage capacitor C3 is rapidly charged, so that the voltage at the control end of the first electronic switch tube Q4 rapidly rises, so that the voltage at the control end of the first electronic switch tube Q4 is greater than the threshold voltage of the first electronic switch tube Q4, thereby making the first electronic switch tube Q4 be turned on. When the first electronic switch tube Q4 is turned on, the current output by the external power supply is transmitted to the first end of the first electronic switch tube Q4 after passing through the second current-limiting resistor R4, and flows to the first electrolytic capacitor CE3 through the second end of the first electronic switch tube Q4, so that the first electrolytic capacitor CE3 starts to be rapidly charged, thereby making the positive pole voltage of the first electrolytic capacitor CE3 rise. At this time, since the power input end of the main control chip 300 is connected to the positive pole of the first electrolytic capacitor CE3, when the positive pole voltage of the first electrolytic capacitor CE3 reaches the start voltage of the main control chip 300, the main control chip 300 starts to work, thereby driving the power correction rectifier input module 100 to enter the normal working state.

[0036] Specifically, the power correction rectifier input module 100 outputs voltage to the power supply transformer secondary side, so that the power supply transformer secondary side of the power correction rectifier input module generates current and is transmitted to the second electrolytic capacitor CE2, thereby making the positive voltage of the second electrolytic capacitor CE2 rise rapidly. When the positive voltage of the second electrolytic capacitor CE2 is higher than the breakdown voltage of the first stable voltage diode ZD2, the first stable voltage diode ZD2 is broken down and provides stable current to the second energy storage capacitor C2, thereby making the voltage of the second energy storage capacitor C2 rise. When the first end voltage of the second energy storage capacitor C2 is greater than the conduction threshold voltage of the second electronic switch tube Q5, the second electronic switch tube Q5 is turned on, and at the same time, since the control end of the first electronic switch tube Q4 is connected with the first end of the second electronic switch tube Q5, after the second electronic switch tube Q5 is turned on, the control end of the first electronic switch tube Q4 is pulled to low level, thereby making the first electronic switch tube Q4 cut off and cutting off the fast start circuit to reduce the power consumption of the fast start circuit.

[0037] Further, when the first electronic switch tube Q4 is cut off, the first electrolytic capacitor CE3 forms a current loop with the ground end through the discharge resistor R6 and releases electric energy, so that the first electrolytic capacitor CE3 can realize the time range of fast response secondary start, thereby meeting the requirements of the DALI protocol for secondary fast start; in addition, after the main control chip 300 stops working, the positive voltage of the second electrolytic capacitor CE2 decreases, so that the control end voltage of the second electronic switch tube Q5 decreases, thereby making it in the cut-off state, and further making the fast start module 200 return to the initial state for the next fast start work.

[0038] The above-mentioned fast start circuit 10 based on DALI, after the power is connected, the fast start module 200 is loaded to the first energy storage capacitor C3 through the first current limiting resistor R2 after voltage division and current limiting, so that the first energy storage capacitor C3 can quickly charge the control end of the first electronic switch tube Q4, thereby making the first electronic switch tube Q4 be quickly turned on, and further making the main control chip 300 obtain sufficient start voltage and meeting the requirements of the DALI protocol for fast start time. When the main control chip 300 works normally, the input end voltage of the fast start module 200 is loaded to the control end of the second electronic switch tube Q5, so that the second electronic switch tube Q5 is turned on and pulls down the control end voltage of the first electronic switch tube Q4, thereby making the first electronic switch tube Q4 cut off and cutting off the fast start circuit, and further reducing the power consumption of the fast start circuit 10 based on DALI and improving the energy efficiency of the fast start circuit 10 based on DALI. In addition, the discharge resistor R6 provides a discharge path for the first electrolytic capacitor CE3, so that after the external power supply power supply end is powered off, the first electrolytic capacitor CE3 can be quickly discharged, thereby making the fast start circuit quickly respond when starting next time, and further meeting the requirements of the DALI protocol for secondary start time.

[0039] In another embodiment, the first electronic switch Q4 is an N-channel MOSFET, the first terminal of the first electronic switch Q4 is the drain of the N-channel MOSFET, the first terminal of the first electronic switch Q4 is the source of the N-channel MOSFET, and the control terminal of the first electronic switch Q4 is the gate of the N-channel MOSFET. The second electronic switch Q5 is an N-channel MOSFET, the first terminal of the second electronic switch Q5 is the drain of the N-channel MOSFET, the first terminal of the second electronic switch Q5 is the source of the N-channel MOSFET, and the control terminal of the second electronic switch Q5 is the gate of the N-channel MOSFET.

[0040] like Figure 1 As shown, in one embodiment, the startup circuit 210 further includes a first voltage divider resistor R1. The first end of the first voltage divider resistor R1 is connected to the external power supply terminal, and the second end of the first voltage divider resistor R1 is connected to the first end of the first current-limiting resistor R2. In this embodiment, when the external power supply terminal outputs a stable voltage, the current first flows through the first voltage divider resistor R1, and then through the first current-limiting resistor R2, so that the first voltage divider resistor R1 and the first current-limiting resistor R2 are connected in series, forming a voltage divider network for the external power supply terminal voltage. Specifically, the resistor network formed by the series connection of the first voltage divider resistor R1 and the first current-limiting resistor R2 can accelerate the startup speed of the first electronic switch Q4 while ensuring safety. At the instant the power is connected, the first voltage divider resistor R1 can quickly divide the voltage and guide the current to the first energy storage capacitor C3, causing the control terminal voltage of the first electronic switch Q4 to rapidly rise above the conduction threshold, thereby greatly shortening the startup time of the main control chip 300.

[0041] like Figure 1 As shown, in one embodiment, the startup circuit 210 further includes a second voltage divider resistor R3. The first end of the second voltage divider resistor R3 is connected to the external power supply terminal, and the second end of the second voltage divider resistor R3 is connected to the first end of the second current-limiting resistor R4. In this embodiment, when the external power supply terminal outputs a stable voltage, since the second voltage divider resistor R3 and the second current-limiting resistor R4 are connected in series, they together form a second voltage divider network for the external power supply terminal voltage. The current first flows through the second voltage divider resistor R3, then through the second current-limiting resistor R4, and finally reaches the first end of the first electronic switch Q4. When the first electronic switch Q4 is turned on, the current output from the external power supply terminal is stably transmitted to the first end of the first electronic switch Q4 through the series network of the second current-limiting resistor R4 and the second voltage divider resistor R3, and then flows to the first electrolytic capacitor CE3 for charging. The presence of the second voltage divider resistor R3 makes the current in this process more stable, avoiding voltage instability caused by current fluctuations, thereby improving the reliability and stability of the entire startup circuit 210.

[0042] As Figure 1 shown, in one embodiment, the starting circuit 210 further comprises a second Zener diode ZD1, the negative electrode of the second Zener diode ZD1 is connected to the control end of the first electronic switch tube Q4, and the positive electrode of the second Zener diode ZD1 is grounded. In this embodiment, when the external power supply output stable voltage and flows to the first energy storage capacitor C3 through the first current-limiting resistor R2, the first energy storage capacitor C3 starts to charge rapidly, and then the voltage of the control end of the first electronic switch tube Q4 rises rapidly. In this process, the second Zener diode ZD1 is connected in parallel between the control end of the first electronic switch tube Q4 and the ground, which plays a key role in voltage limiting. Specifically, as the first energy storage capacitor C3 charges, the voltage at the control end of the first electronic switch tube Q4 will gradually rise. When this voltage exceeds the breakdown voltage of the second Zener diode ZD1, the second Zener diode ZD1 will immediately conduct, and the excess voltage will be discharged to the ground through itself, thereby ensuring that the voltage at the control end of the first electronic switch tube Q4 will not rise unlimitedly, but will be stably limited within the safe range of the breakdown voltage of the second Zener diode ZD1, thereby ensuring that the first electronic switch tube Q4 can work normally.

[0043] As Figure 1 shown, in one embodiment, the starting circuit 210 further comprises a first rectifier diode D3, the negative electrode of the first rectifier diode D3 is connected to the positive electrode of the first electrolytic capacitor CE3, and the positive electrode of the first rectifier diode D3 is connected to the positive electrode of the second electrolytic capacitor CE2. In this embodiment, when the external power supply output stable voltage and flows to the first energy storage capacitor C3 through the first current-limiting resistor R2, the voltage at the control end of the first electronic switch tube Q4 rises and turns on, and the current flows to the first electrolytic capacitor CE3 through the first electronic switch tube Q4. When the first electronic switch tube Q4 is turned on, since the first rectifier diode D3 is connected to the positive electrode of the first electrolytic capacitor CE3, the current at the positive electrode of the first electrolytic capacitor CE3 can flow to the ground in one direction, thereby preventing the current at the positive electrode of the first electrolytic capacitor CE3 from flowing into the positive electrode of the second electrolytic capacitor CE2 in the shutdown circuit 220, thereby ensuring that the main control chip 300 obtains stable voltage.

[0044] As Figure 1As shown, in one embodiment, the shut-off circuit 220 further includes a second rectifier diode D2. The cathode of the second rectifier diode D2 is connected to the anode of the second electrolytic capacitor CE2, and the anode of the second rectifier diode D2 is used to connect to the secondary side of the power supply transformer of the power correction rectifier input module 100. In this embodiment, when the power correction rectifier input module 100 outputs voltage to its power supply transformer secondary side, this voltage not only causes current to be generated in the winding coil within the power supply transformer secondary side of the power correction rectifier input module 100, but also directly acts on the second rectifier diode D2. Because the cathode of the second rectifier diode D2 is connected to the first terminal of the second electrolytic capacitor CE2, and the anode is connected to the power supply transformer secondary side of the power correction rectifier input module 100, it is ensured that the current can only flow unidirectionally from the power supply transformer secondary side of the power correction rectifier input module 100 to the second electrolytic capacitor CE2, and cannot flow in the reverse direction.

[0045] like Figure 1 As shown, in one embodiment, the shutdown circuit 220 further includes a third voltage divider resistor R5. The first end of the third voltage divider resistor R5 is connected to the positive terminal of the first Zener diode ZD2, and the second end of the third voltage divider resistor R5 is grounded. In this embodiment, when the power correction rectifier input module 100 outputs voltage to the input terminal of the fast start module 200, causing the positive voltage of the second electrolytic capacitor CE2 to rise rapidly, the voltage of the second electrolytic capacitor CE2 will pass through the voltage divider network composed of the first Zener diode ZD2 and the third voltage divider resistor R5. Since the first end of the third voltage divider resistor R5 is connected to the positive terminal of the first Zener diode ZD2 and the second end is grounded, the high voltage of the second electrolytic capacitor CE2 can be reduced by a relatively stable voltage division ratio, thereby providing a more suitable and stable operating voltage for the control terminal of the second electronic switch Q5.

[0046] like Figure 1As shown, in one embodiment, the power correction rectifier input module 100 includes a rectifier bridge circuit BD1 and a filter capacitor C1. The input terminal of the rectifier bridge circuit BD1 is connected to an external power supply terminal, and the output terminal of the rectifier bridge circuit BD1 is connected to the input terminal of the fast start module 200. The first terminal of the filter capacitor C1 is connected to the output terminal of the rectifier bridge circuit BD1, and the second terminal of the filter capacitor C1 is grounded. In this embodiment, when the positive half-cycle of the AC current arrives, two diodes in the rectifier bridge conduct to complete the current path for the positive half-cycle. When the negative half-cycle of the AC current arrives, the other two diodes conduct to complete the current path for the negative half-cycle, resulting in a continuous DC current at the output terminal of the rectifier bridge circuit BD1, thereby providing a stable DC power supply for subsequent circuits. The filter capacitor C1 is connected between the output terminal of the rectifier bridge circuit BD1 and ground, which smooths and rectifies the DC current output by the rectifier bridge circuit BD1, thereby reducing the pulsation component. Since the DC output of the rectifier bridge is actually composed of a series of pulsating DC currents, these pulsations cause voltage fluctuations, which adversely affect the stable operation of subsequent circuits. The filter capacitor C1, through its charging and discharging process, absorbs these pulsating components, making the output voltage more stable. This ensures the normal operation of the fast-start module 200, thereby improving the stability and reliability of the DALI-based fast-start circuit 10.

[0047] like Figure 1 As shown, in one embodiment, the bleeder resistor R6 is an adjustable resistor. In this embodiment, when the external power supply is disconnected, the first electrolytic capacitor CE3 begins to form a current loop with the ground terminal through the bleeder resistor R6 and releases electrical energy. Since the bleeder resistor R6 is adjustable, its resistance value can be adjusted to control the discharge speed of the first electrolytic capacitor CE3. When a faster discharge speed is required, the resistance value of the bleeder resistor R6 can be decreased, which increases the current in the current loop and shortens the discharge time of the first electrolytic capacitor CE3. Conversely, when a slower discharge speed is required, the resistance value of the bleeder resistor R6 can be increased, which decreases the current in the current loop and prolongs the discharge time of the first electrolytic capacitor CE3. Thus, by adjusting the resistance value of the bleeder resistor R6, the discharge time of the first electrolytic capacitor CE3 can be precisely controlled, thereby ensuring that the duration of rapid secondary startup remains within a certain range and meets the requirements of the DALI protocol.

[0048] The constant voltage power supply comprises the DALI-based fast starting circuit 10 of any one of the above. In the embodiment, when the voltage output by the external power supply is stable, the current flows through the first current-limiting resistor R2, and then the current flows to the first energy storage capacitor C3 and rapidly charges the first energy storage capacitor C3, so that the voltage at the control end of the first electronic switch tube Q4 rapidly rises, so that the voltage at the control end of the first electronic switch tube Q4 is greater than the turn-on threshold voltage of the first electronic switch tube Q4, thereby making the first electronic switch tube Q4 conductive. When the first electronic switch tube Q4 is conductive, the current output by the external power supply is transmitted to the first end of the first electronic switch tube Q4 through the second current-limiting resistor R4, and flows to the first electrolytic capacitor CE3 through the second end of the first electronic switch tube Q4, so that the first electrolytic capacitor CE3 starts to be rapidly charged, thereby causing the positive electrode voltage of the first electrolytic capacitor CE3 to rise. At this time, since the power input end of the main control chip 300 is connected with the positive electrode of the first electrolytic capacitor CE3, when the positive electrode voltage of the first electrolytic capacitor CE3 reaches the start voltage of the main control chip 300, the main control chip 300 starts to work, thereby driving the power correction rectifier input module 100 to enter a normal working state. Specifically, the power correction rectifier input module 100 outputs voltage to the power supply voltage secondary side thereof, so that the power supply voltage secondary side of the power correction rectifier input module generates current and transmits the current to the second electrolytic capacitor CE2, thereby causing the positive electrode voltage of the second electrolytic capacitor CE2 to rapidly rise. When the positive electrode voltage of the second electrolytic capacitor CE2 is higher than the breakdown voltage of the first voltage stabilizing diode ZD2, the first voltage stabilizing diode ZD2 is broken down and provides stable current to the second energy storage capacitor C2, thereby causing the voltage of the second energy storage capacitor C2 to rise. When the voltage at the first end of the second energy storage capacitor C2 is greater than the turn-on threshold voltage of the second electronic switch tube Q5, the second electronic switch tube Q5 is conductive. Since the control end of the first electronic switch tube Q4 is connected with the first end of the second electronic switch tube Q5, when the second electronic switch tube Q5 is conductive, the control end of the first electronic switch tube Q4 is pulled to a low level, thereby causing the first electronic switch tube Q4 to be cut off and the fast starting circuit to be cut off, so as to reduce the power consumption of the fast starting circuit. Further, when the first electronic switch tube Q4 is cut off, the first electrolytic capacitor CE3 forms a current loop with the ground through the bleeder resistor R6 and releases electric energy, so that the first electrolytic capacitor CE3 can realize fast response and secondary starting in a time range, thereby meeting the requirement of the DALI protocol for secondary fast starting. In addition, when the main control chip 300 stops working, the positive electrode voltage of the second electrolytic capacitor CE2 decreases, so that the voltage at the control end of the second electronic switch tube Q5 decreases, thereby causing the second electronic switch tube Q5 to be in a cut-off state, and further causing the fast starting module 200 to return to an initial state, so as to be ready for the next fast starting work.

[0049] Compared with the prior art, the present disclosure has at least the following advantages:

[0050] 1. The fast start circuit 10 based on DALI, after the power supply is connected, the fast start module 200 is loaded to the first energy storage capacitor C3 through the first current limiting resistor R2 voltage division current limiting, so that the first energy storage capacitor C3 can quickly charge the control end of the first electronic switch tube Q4, so that the first electronic switch tube Q4 can be quickly turned on, and then the main control chip 300 obtains sufficient starting voltage and meets the requirement of DALI protocol for fast starting time.

[0051] 2. When the main control chip 300 works normally, the input voltage of the fast start module 200 is loaded to the control end of the second electronic switch tube Q5, so that the second electronic switch tube Q5 is turned on and the control end voltage of the first electronic switch tube Q4 is pulled low, so that the first electronic switch tube Q4 is cut off and the fast start circuit is cut off, and then the power consumption of the fast start circuit 10 based on DALI is reduced and the energy efficiency of the fast start circuit 10 based on DALI is improved.

[0052] 3. In addition, the discharge resistor R6 provides a discharge path for the first electrolytic capacitor CE3, so that the first electrolytic capacitor CE3 can be quickly discharged after the external power supply is disconnected, so that the fast start circuit can quickly respond when starting next time, and then the requirement of DALI protocol for secondary starting time is met.

[0053] The above-described embodiments only express several embodiments of the present disclosure, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the disclosed patent. It should be noted that for ordinary skilled in the art, without departing from the concept of the present disclosure, a number of modifications and improvements can be made, which belong to the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure patent should be subject to the appended claims.

Claims

1. A fast start-up circuit based on DALI, characterized in that The power correction rectifier input module, the fast start module and the main control chip are included, The power correction rectifier input module is used for providing electric energy for the fast start module; The fast start module includes a start circuit and a close circuit, the start circuit includes a first electronic switch tube, a first current-limiting resistor, a second current-limiting resistor, a first energy storage capacitor and a first electrolytic capacitor, a first end of the first current-limiting resistor is used for being connected with an external power supply end, a second end of the first current-limiting resistor is connected with a control end of the first electronic switch tube, a first end of the second current-limiting resistor is used for being connected with the external power supply end, a second end of the second current-limiting resistor is connected with a first end of the first electronic switch tube, a positive pole of the first electrolytic capacitor is connected with a second end of the first electronic switch tube, a negative pole of the first electrolytic capacitor is grounded, a first end of the first energy storage capacitor is connected with the control end of the first electronic switch tube, and a second end of the first energy storage capacitor is grounded. The close circuit includes a second electronic switch tube, a second electrolytic capacitor, a second energy storage capacitor, a first voltage stabilizing diode and a discharge resistor, a positive pole of the second electrolytic capacitor and a negative pole of the first voltage stabilizing diode are both connected with the second end of the first electronic switch tube, a negative pole of the second electrolytic capacitor is grounded, a positive pole of the first voltage stabilizing diode is connected with a control end of the second electronic switch tube, a first end of the second electronic switch tube is connected with the control end of the first electronic switch tube, a second end of the second electronic switch tube is grounded, a first end of the second energy storage capacitor is connected with the control end of the second electronic switch tube, a second end of the second energy storage capacitor is grounded, a first end of the discharge resistor is connected with the positive pole of the first electrolytic capacitor, and a second end of the discharge resistor is grounded. A power input end of the main control chip is connected with the positive pole of the first electrolytic capacitor, and the main control chip is used for controlling the power correction rectifier input module and the fast start module to normally work.

2. The DALI based fast start-up circuit of claim 1, wherein, The start circuit further includes a first voltage dividing resistor, a first end of the first voltage dividing resistor is used for being connected with the external power supply end, and a second end of the first voltage dividing resistor is connected with the first end of the first current-limiting resistor.

3. The DALI based fast start-up circuit of claim 1, wherein, The start circuit further includes a second voltage dividing resistor, a first end of the second voltage dividing resistor is used for being connected with the external power supply end, and a second end of the second voltage dividing resistor is connected with the first end of the second current-limiting resistor.

4. The DALI based fast start-up circuit of claim 1, wherein, The start circuit further includes a second voltage stabilizing diode, a negative pole of the second voltage stabilizing diode is connected with the control end of the first electronic switch tube, and a positive pole of the second voltage stabilizing diode is grounded.

5. The DALI based fast start-up circuit of claim 1, wherein, The start circuit further includes a first rectifier diode, a negative pole of the first rectifier diode is connected with the positive pole of the first electrolytic capacitor, and a positive pole of the first rectifier diode is connected with a positive pole of a second electrolytic capacitor.

6. The DALI based fast start-up circuit of claim 1, wherein, The close circuit further includes a second rectifier diode, a negative pole of the second rectifier diode is connected with the positive pole of the second electrolytic capacitor, and a positive pole of the second rectifier diode is used for being connected with a power supply transformer secondary side of the power correction rectifier input module.

7. The DALI based fast start-up circuit according to claim 6, characterized in that The closing circuit further comprises a third voltage dividing resistor, a first end of the third voltage dividing resistor is connected with the anode of the first voltage stabilizing diode, and a second end of the third voltage dividing resistor is grounded.

8. The DALI based fast start-up circuit of claim 1, wherein, The power correction rectifying input module comprises a rectifying bridge circuit and a filter capacitor, an input end of the rectifying bridge circuit is used for being connected with a power supply end of an external power supply, an output end of the rectifying bridge circuit is connected with an input end of the fast start module, a first end of the filter capacitor is connected with the output end of the rectifying bridge circuit, and a second end of the filter capacitor is grounded.

9. The DALI based fast start-up circuit of claim 1, wherein, The discharge resistor is an adjustable resistor.

10. A constant voltage power supply characterized by comprising: The DALI-based fast start circuit comprises any one of claims 1 to 9.

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