Independent auxiliary source circuit and electronic device

Abstract

The utility model relates to independent auxiliary source circuit and electronic equipment, include: rectifier bridge, starting circuit, auxiliary source controller, auxiliary power supply circuit, first voltage stabilizing current expansion circuit and second voltage stabilizing current expansion circuit, the input of starting circuit connects the output of rectifier bridge, and the first output of starting circuit connects the power supply end of auxiliary source controller, and the input of first voltage stabilizing current expansion circuit and the control end of second voltage stabilizing current expansion circuit connect the first output of auxiliary power supply circuit, and the output of first voltage stabilizing current expansion circuit connects the power supply end of auxiliary source controller, and the control end of first voltage stabilizing current expansion circuit connects the second output of starting circuit, the input of second voltage stabilizing current expansion circuit connects the second output of auxiliary power supply circuit, and the output of second voltage stabilizing current expansion circuit connects other power supply circuit. Through the utility model can realize main output quick power down and auxiliary power supply quick power down, and will not appear the phenomenon of restart when continuous on-off.

Description

Technical Field

[0001] This utility model relates to the technical field of power supply, and more specifically, to an independent auxiliary power source circuit and electronic device. Background Technology

[0002] An independent auxiliary power source is an integral part of the design of a driver power supply (such as an LED driver power supply), which is used to provide a stable power supply to the control circuits, controllers and other circuits in the driver power supply.

[0003] For emergency equipment or products requiring rapid power loss, existing independent auxiliary power sources cannot meet the requirements for rapid shutdown. Moreover, power output fluctuations often occur during rapid power-on and power-off. For example, the presence of large-capacity electrolytic capacitors at the output terminal can cause the power supply to restart during shutdown, making it prone to restarting during rapid power-on and power-off processes, thus reducing product stability and safety. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an independent auxiliary source circuit and electronic device, addressing the problems existing in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: to construct an independent auxiliary source circuit, including: a rectifier bridge, a startup circuit, an auxiliary source controller, an auxiliary power supply circuit, a first voltage regulator and current amplification circuit, and a second voltage regulator and current amplification circuit;

[0006] The input terminal of the rectifier bridge is connected to the AC input terminal, and the output terminal of the rectifier bridge is connected to the input terminal of the startup circuit. The first output terminal of the startup circuit is connected to the power supply terminal of the auxiliary power source controller. The input terminal of the first voltage regulator and current amplification circuit is connected to the first output terminal of the auxiliary power supply circuit, and the output terminal of the first voltage regulator and current amplification circuit is connected to the power supply terminal of the auxiliary power source controller. The control terminal of the first voltage regulator and current amplification circuit is connected to the second output terminal of the startup circuit. The input terminal of the second voltage regulator and current amplification circuit is connected to the second output terminal of the auxiliary power supply circuit, and the output terminal of the second voltage regulator and current amplification circuit is connected to other power supply lines. The control terminal of the second voltage regulator and current amplification circuit is connected to the first output terminal of the auxiliary power supply circuit.

[0007] The startup circuit is used to provide a startup voltage to the auxiliary source controller during startup and to quickly disconnect the power supply during shutdown;

[0008] The auxiliary power supply circuit is used to provide power after entering a stable working state, and provides a stable working voltage to the auxiliary source controller through the first voltage regulator and current amplification circuit, and provides a stable working voltage to other power supply lines through the second voltage regulator and current amplification circuit. When the power is off, both the first voltage regulator and current amplification circuit and the second voltage regulator and current amplification circuit are cut off.

[0009] In the independent auxiliary power source circuit described in this utility model, the auxiliary power supply circuit includes: a first power supply circuit, a second power supply circuit, and an auxiliary power supply.

[0010] The input terminals of the first power supply circuit and the second power supply circuit are connected to the output terminal of the auxiliary power supply. The output terminal of the first power supply circuit is connected to the input terminal of the first voltage regulator and current amplifier circuit and the control terminal of the second voltage regulator and current amplifier circuit, respectively. The output terminal of the second power supply circuit is connected to the input terminal of the second voltage regulator and current amplifier circuit.

[0011] In the independent auxiliary source circuit described in this utility model, the startup circuit includes: a first resistor, a first Zener diode, and a first capacitor;

[0012] The input terminal of the first resistor is connected to the output terminal of the rectifier bridge, the output terminal of the first resistor is connected to the negative terminal of the first Zener diode and connected to the control terminal of the first voltage regulator and current amplification circuit, the positive terminal of the first Zener diode is connected to the input terminal of the first capacitor, the output terminal of the first capacitor is grounded, and the input terminal of the first capacitor is also connected to the power supply terminal of the auxiliary source controller.

[0013] In the independent auxiliary power source circuit described in this utility model, the first power supply circuit includes: a fourth diode and a second capacitor; the auxiliary power supply includes: an auxiliary winding;

[0014] The positive terminal of the fourth diode is connected to the output terminal of the auxiliary winding, and the negative terminal of the fourth diode is connected to the input terminal of the second capacitor and to the input terminal of the first voltage regulator and current amplification circuit.

[0015] In the independent auxiliary source circuit described in this utility model, the first voltage regulator and current amplification circuit includes: a second resistor, a second Zener diode, a third resistor, a second transistor, and a third diode;

[0016] The input terminal of the second resistor is connected to the output terminal of the first resistor. The output terminal of the second resistor is connected to the negative terminal of the second Zener diode and the input terminal of the third resistor. The positive terminal of the second Zener diode is grounded. The output terminal of the third resistor is connected to the base of the second transistor. The emitter of the second transistor is connected to the positive terminal of the third diode. The negative terminal of the third diode is connected to the power supply terminal of the auxiliary source controller. The collector of the second transistor is connected to the input terminal of the second capacitor.

[0017] The input terminal of the second capacitor is the control terminal of the first voltage regulator and current amplification circuit, and the input terminal of the second capacitor is the output terminal of the first power supply circuit.

[0018] In the independent auxiliary power source circuit described in this utility model, the second power supply circuit includes: a sixth diode and a third energy storage capacitor;

[0019] The positive terminal of the sixth diode is connected to the output terminal of the auxiliary power supply, the negative terminal of the sixth diode is connected to the input terminal of the third energy storage capacitor and the input terminal of the second voltage regulator and current amplification circuit, and the output terminal of the third energy storage capacitor is grounded.

[0020] In the independent auxiliary source circuit described in this utility model, the second voltage regulator and current amplification circuit includes: a fourth resistor, a third Zener diode, a fifth diode, a third transistor, and a third capacitor;

[0021] The input terminal of the fourth resistor is connected to the output terminal of the first power supply circuit. The output terminal of the fourth resistor is connected to the negative terminal of the third Zener diode and the base of the third transistor. The positive terminal of the third Zener diode is grounded. The emitter of the third transistor is connected to the input terminal of the third capacitor. The collector of the third transistor is connected to the negative terminal of the fifth diode. The anode of the fifth diode is connected to the input terminal of the third energy storage capacitor. The input terminal of the third capacitor is also connected to the other power supply lines. The output terminal of the third capacitor is grounded.

[0022] The input terminal of the third capacitor is the output terminal of the second voltage regulator and current amplification circuit.

[0023] The independent auxiliary power source circuit described in this utility model also includes: a main power supply and a main power supply output circuit;

[0024] The input terminal of the main power supply is connected to the output terminal of the rectifier bridge through a PFC input circuit, and the output terminal of the main power supply is connected to the control terminal of the auxiliary source controller. The main power supply output circuit is coupled to the main power supply and generates the main power supply voltage.

[0025] In the independent auxiliary power source circuit described in this utility model, the main power supply includes: a main winding; the main power supply output circuit includes: a main output winding, a second diode, and a first energy storage capacitor;

[0026] The main winding is connected to the output terminal of the rectifier bridge through the PFC input circuit. The main output winding is coupled to the main winding. The positive terminal of the second diode is connected to the output terminal of the main output winding, and the negative terminal of the second diode is connected to the input terminal of the first energy storage capacitor. The output terminal of the first energy storage capacitor is grounded, and the input terminal of the first energy storage capacitor generates the main power supply voltage.

[0027] This utility model also provides an electronic device, including: the independent auxiliary source circuit described above.

[0028] The independent auxiliary power source circuit and electronic equipment of this utility model have the following beneficial effects: It includes a rectifier bridge, a startup circuit, an auxiliary power source controller, an auxiliary power supply circuit, a first voltage regulator and current amplification circuit, and a second voltage regulator and current amplification circuit. The input terminal of the startup circuit is connected to the output terminal of the rectifier bridge; the first output terminal of the startup circuit is connected to the power supply terminal of the auxiliary power source controller; the input terminal of the first voltage regulator and current amplification circuit and the control terminal of the second voltage regulator and current amplification circuit are connected to the first output terminal of the auxiliary power supply circuit; the output terminal of the first voltage regulator and current amplification circuit is connected to the power supply terminal of the auxiliary power source controller; the control terminal of the first voltage regulator and current amplification circuit is connected to the second output terminal of the startup circuit; the input terminal of the second voltage regulator and current amplification circuit is connected to the second output terminal of the auxiliary power supply circuit; and the output terminal of the second voltage regulator and current amplification circuit is connected to other power supply lines. This utility model enables rapid power-off of both the main output and the auxiliary power supply, and prevents restarting during continuous power-on and power-off cycles. Attached Figure Description

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0030] Figure 1 This is a schematic block diagram of the independent auxiliary source circuit provided in this embodiment of the utility model;

[0031] Figure 2 This is a circuit diagram of the independent auxiliary source circuit provided in this embodiment of the utility model. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] This utility model provides an independent auxiliary power source circuit, which can solve the problem of emergency equipment or products with rapid power-off application requirements. Through this independent auxiliary power source circuit, the main output can be quickly powered off and the auxiliary power supply can be quickly powered off. Moreover, the output will not restart during continuous power-on and power-off (repeated switching).

[0034] refer to Figure 1 , Figure 1 A preferred embodiment of the independent auxiliary source circuit provided by this utility model is shown.

[0035] like Figure 1 As shown, in this embodiment, the independent auxiliary source circuit includes: a rectifier bridge BD1, a startup circuit 101, an auxiliary source controller 102, an auxiliary power supply circuit, a first voltage regulator and current amplification circuit 106, and a second voltage regulator and current amplification circuit 107.

[0036] The input terminal of rectifier bridge BD1 is connected to the AC input terminal, and the output terminal of rectifier bridge BD1 is connected to the input terminal of startup circuit 101. The first output terminal of startup circuit 101 is connected to the power supply terminal of auxiliary power source controller 102. The input terminal of first voltage regulator and current amplification circuit 106 is connected to the first output terminal of auxiliary power supply circuit, and the output terminal of first voltage regulator and current amplification circuit 106 is connected to the power supply terminal of auxiliary power source controller 102. The control terminal of first voltage regulator and current amplification circuit 106 is connected to the second output terminal of startup circuit 101. The input terminal of second voltage regulator and current amplification circuit 107 is connected to the second output terminal of auxiliary power supply circuit, and the output terminal of second voltage regulator and current amplification circuit 107 is connected to other power supply lines. The control terminal of second voltage regulator and current amplification circuit 107 is connected to the first output terminal of auxiliary power supply circuit.

[0037] The startup circuit 101 is used to provide startup voltage to the auxiliary power source controller 102 during startup and to quickly disconnect the power supply when the power is off. The auxiliary power supply circuit is used to provide power after entering a stable working state, and provides a stable working voltage to the auxiliary power source controller 102 through the first voltage regulator and current amplification circuit 106 and to other power supply lines through the second voltage regulator and current amplification circuit 107. When the power is off, both the first voltage regulator and current amplification circuit 106 and the second voltage regulator and current amplification circuit 107 are cut off.

[0038] Specifically, when the computer is powered on:

[0039] An AC voltage is input, and after rectification by rectifier bridge BD1, the AC voltage charges the startup circuit 101. When the charging reaches the startup voltage of the auxiliary power controller 102, the auxiliary power controller 102 enters the startup state. During the process of the auxiliary power controller 102 entering the startup state and then entering a stable working state, the startup circuit 101 provides a reference voltage to the first voltage regulator and current amplification circuit 106 to turn it on. At this time, the auxiliary power supply circuit provides the working voltage to the auxiliary power controller 102 through the first voltage regulator and current amplification circuit 106 (i.e., the power supply to the auxiliary power controller 102 is switched from the startup circuit 101 to the auxiliary power supply circuit). Simultaneously, as the voltage supplied by the auxiliary power supply circuit to the control terminal of the second voltage regulator and current amplification circuit 107 continues to rise and rises to the conduction voltage of the second voltage regulator and current amplification circuit 107, the second voltage regulator and current amplification circuit 107 turns on, and then the auxiliary power supply circuit provides the working voltage to other power supply lines (such as other control chips, power demand circuits, etc.) through the second voltage regulator and current amplification circuit 107.

[0040] When the computer is turned off:

[0041] At this time, there is no AC voltage input, and the voltage after rectifier bridge BD1 discharges rapidly. Because of this rapid voltage drop, the power supply network of startup circuit 101 is disconnected, preventing it from supplying voltage to auxiliary source controller 102. Furthermore, due to the disconnection of the power supply network, the voltage at the control terminal of the first voltage regulator and current amplification circuit 106 also drops, causing it to shut down. This prevents the auxiliary power supply circuit from continuing to supply operating voltage to the auxiliary source controller 102. Simultaneously, because the first voltage regulator and current amplification circuit 106 is off, the voltage supplied by the auxiliary power supply circuit to the second voltage regulator and current amplification circuit 107 also drops and cannot meet the voltage requirements for its conduction. Therefore, the second voltage regulator and current amplification circuit 107 also shuts down, ceasing power supply to other lines, thus ensuring that all chips in the circuit are reset to their initial state.

[0042] In some embodiments, the auxiliary power supply circuit includes a first power supply circuit 104, a second power supply circuit 105, and an auxiliary power supply 103. The input terminals of the first power supply circuit 104 and the second power supply circuit 105 are connected to the output terminal of the auxiliary power supply 103. The output terminal of the first power supply circuit 104 is connected to the input terminal of the first voltage regulator and current amplification circuit 106 and the control terminal of the second voltage regulator and current amplification circuit 107, respectively. The output terminal of the second power supply circuit 105 is connected to the input terminal of the second voltage regulator and current amplification circuit 107. Specifically, when the first voltage regulator and current amplification circuit 106 is turned on, the first power supply circuit 104 provides operating voltage to the auxiliary source controller 102 through the first voltage regulator and current amplification circuit 106, and simultaneously provides turn-on voltage to the control terminal of the second voltage regulator and current amplification circuit 107. The second power supply circuit 105 provides operating voltage to other power supply lines through the second voltage regulator and current amplification circuit 107 when the second voltage regulator and current amplification circuit 107 is turned on.

[0043] Furthermore, such as Figure 1 As shown, the independent auxiliary power source circuit also includes: a main power supply 108 and a main power supply output circuit 109; the input terminal of the main power supply 108 is connected to the output terminal of the rectifier bridge BD1 through the PFC input circuit, the output terminal of the main power supply 108 is connected to the control terminal of the auxiliary power source controller 102, and the main power supply output circuit 109 is coupled to the main power supply 108 and generates the main power supply voltage.

[0044] In a preferred embodiment, such as Figure 2 As shown, the auxiliary power source controller 102 includes an auxiliary power supply chip U1; the startup circuit 101 includes a first resistor R1, a first Zener diode ZD1, and a first capacitor C1; the input terminal of the first resistor R1 is connected to the output terminal of the rectifier bridge BD1, the output terminal of the first resistor R1 is connected to the negative terminal of the first Zener diode ZD1 and connected to the control terminal of the first voltage regulator and current amplification circuit 106, the positive terminal of the first Zener diode ZD1 is connected to the input terminal of the first capacitor C1, the output terminal of the first capacitor C1 is grounded, and the input terminal of the first capacitor C1 is also connected to the power supply terminal of the auxiliary power source controller 102. The first resistor R1 serves as a current limiter, and the first Zener diode ZD1 provides undervoltage protection. Specifically, when the AC voltage is lower than the startup voltage of the auxiliary power supply chip U1, the first Zener diode ZD1 provides undervoltage protection for the auxiliary power supply chip U1, preventing it from entering an undervoltage operating state and affecting or even damaging it.

[0045] like Figure 2As shown, the first power supply circuit 104 includes a fourth diode D4 and a second capacitor C2; the auxiliary power supply 103 includes an auxiliary winding T1-A. The anode of the fourth diode D4 is connected to the output terminal of the auxiliary winding T1-A, and the cathode of the fourth diode D4 is connected to the input terminal of the second capacitor C2 and then to the input terminal of the first voltage regulator and current amplification circuit 106. The second power supply circuit 105 includes a sixth diode D6 and a third energy storage capacitor CE3. The anode of the sixth diode D6 is connected to the output terminal of the auxiliary power supply 103 (i.e., the output terminal of the auxiliary winding T1-A), and the cathode of the sixth diode D6 is connected to the input terminal of the third energy storage capacitor CE3 and the input terminal of the second voltage regulator and current amplification circuit 107. The output terminal of the third energy storage capacitor CE3 is grounded.

[0046] like Figure 2 As shown, the first voltage regulator and current amplification circuit 106 includes: a second resistor R2, a second Zener diode ZD2, a third resistor R3, a second transistor Q2, and a third diode D3. The input terminal of the second resistor R2 is connected to the output terminal of the first resistor R1. The output terminal of the second resistor R2 is connected to the negative terminal of the second Zener diode ZD2 and the input terminal of the third resistor R3. The positive terminal of the second Zener diode ZD2 is grounded. The output terminal of the third resistor R3 is connected to the base of the second transistor Q2. The emitter of the second transistor Q2 is connected to the positive terminal of the third diode D3. The negative terminal of the third diode D3 is connected to the power supply terminal of the auxiliary power source controller 102. The collector of the second transistor Q2 is connected to the input terminal of the second capacitor C2. The input terminal of the second capacitor C2 is the control terminal of the first voltage regulator and current amplification circuit 106, and the input terminal of the second capacitor C2 is the output terminal of the first power supply circuit 104.

[0047] like Figure 2 As shown, the second voltage regulator and current amplification circuit 107 includes: a fourth resistor R4, a third Zener diode ZD3, a fifth diode D5, a third transistor Q3, and a third capacitor C3.

[0048] The input terminal of the fourth resistor R4 is connected to the output terminal of the first power supply circuit 104 (i.e., the input terminal of the second capacitor C2). The output terminal of the fourth resistor R4 is connected to the negative terminal of the third Zener diode ZD3 and the base of the third transistor Q3. The positive terminal of the third Zener diode ZD3 is grounded. The emitter of the third transistor Q3 is connected to the input terminal of the third capacitor C3. The collector of the third transistor Q3 is connected to the negative terminal of the fifth diode D5. The positive terminal of the fifth diode D5 is connected to the input terminal of the third energy storage capacitor CE3. The input terminal of the third capacitor C3 is also connected to other power supply lines. The output terminal of the third capacitor C3 is grounded. The input terminal of the third capacitor C3 is the output terminal of the second voltage regulator and current amplification circuit 107.

[0049] like Figure 2As shown, the input of the third capacitor C3 outputs VCC, which supplies power to other power lines. VAC is the voltage after rectification by the rectifier bridge BD1.

[0050] like Figure 2 As shown, the main power supply 108 includes a main winding T1-B; the main power supply output circuit 109 includes a main output winding T1-D, a second diode D2, and a first energy storage capacitor CE1. The main winding T1-B is connected to the output terminal of the rectifier bridge BD1 via a PFC input circuit. The main output winding T1-D is coupled to the main winding T1-B. The anode of the second diode D2 is connected to the output terminal of the main output winding T1-D, and the cathode of the second diode D2 is connected to the input terminal of the first energy storage capacitor CE1. The output terminal of the first energy storage capacitor CE1 is grounded, and the input terminal of the first energy storage capacitor CE1 generates the main power supply voltage (i.e., ...). Figure 2 The PFC input circuit includes: capacitor CBB1, PFC inductor L2-B, first diode D1, and second energy storage capacitor CE2.

[0051] This invention improves upon traditional circuitry by utilizing several low-cost components, minimizing costs while enhancing circuit performance. It effectively addresses the rapid power-off requirements of emergency products or products needing rapid power-down. It enables rapid power-down of the main output and auxiliary power supplies VCC and VDD, and the power supply does not restart during continuous power-on and power-off cycles.

[0052] The working principle of powering on is as follows:

[0053] Specifically, such as Figure 2 As shown, during the startup process:

[0054] After the AC voltage is input, the AC inductor is rectified by the rectifier bridge BD1, forming a VAC voltage on CBB1. The VAC voltage charges the first capacitor C1 through the first resistor R1 and the first Zener diode ZD1. When the voltage on the first capacitor C1 reaches the start-up voltage of the auxiliary power supply chip U1, the auxiliary power supply chip U1 enters the start-up state, and the independent auxiliary source starts working (equivalent to a power supply). At the same time, the VAC voltage is input to the main winding through the PFC inductor L2-B and the first diode D1, and the main winding starts working. The auxiliary winding T1-A also enters the working state.

[0055] During startup and the process of entering a stable working state:

[0056] like Figure 2As shown, when the voltage on the first capacitor C1 reaches the startup voltage of the auxiliary power supply chip U1, since the voltage at point B is higher than the voltage of the first capacitor C1, and the voltage at point B provides a conduction voltage to the second voltage regulator and current amplification circuit 107, which consists of the second resistor R2, the second transistor Q2, the second Zener diode ZD2, the third diode D3, and the third resistor R3, the second voltage regulator and current amplification circuit 107 is turned on. At this time, the auxiliary winding T1-A provides the operating voltage to the auxiliary power supply chip U1 through the fourth diode D4, the second capacitor C2, the second transistor Q2, and the third diode D3. Simultaneously, due to the current amplification effect of the second transistor Q2, the circuit can have a stronger load capacity. In addition, the third diode D3 can provide isolation.

[0057] During the process of providing the working voltage to the auxiliary power supply chip U1 through the first voltage regulator and current amplification circuit 106, the voltage at point A gradually rises, and the voltage at point A pre-charges the third capacitor C3 through the fourth resistor R4 and the third transistor Q3. When the voltage at point A rises to the breakdown voltage of the third Zener diode ZD3, the third transistor Q3 turns on. At this time, the auxiliary winding T1-A rapidly charges the third capacitor C3 through the sixth diode D6, the third energy storage capacitor CE3, the fifth diode D5, and the third transistor Q3 (since the third capacitor C3 has been pre-charged before reaching the breakdown voltage of the third Zener diode ZD3, rapid charging can be achieved on this basis to reach the working voltage of other chips and speed up the VCC power supply output). The circuit enters a stable working state when the voltage on the third capacitor C3 reaches the working voltage of other chips.

[0058] It should be noted that during the startup to stable operating state, since the capacitance of the third energy storage capacitor CE3 is greater than that of the second capacitor C2, it is easy to see from U=Q / C or τ=R×C that the voltage across capacitor CE3 is less than the voltage across capacitor C2 at the same time. Therefore, the voltage at point A is always greater than the voltage across the third energy storage capacitor CE3. Furthermore, according to the structure of a transistor, the difference between the collector and emitter lies in their area and doping concentration. Therefore, when the base voltage of the transistor is greater than the collector voltage, a small diffusion current exists. This small diffusion current can be used to pre-charge the third capacitor C3. Further, to prevent current from flowing through the base voltage of the third transistor Q3 to the collector to charge the third energy storage capacitor CE3 during the pre-charging process, thus reducing the pre-charging speed of the third capacitor C3, this invention uses a fifth diode D5 for isolation, thereby ensuring the pre-charging speed of the third capacitor C3.

[0059] How the power is turned off:

[0060] When there is no AC voltage input, CBB1 after rectifier bridge BD1 discharges rapidly, and the VAC voltage drops rapidly. When the VAC voltage drops to a level that cannot break down the first Zener diode ZD1, the startup circuit 101 consisting of the first resistor R1, the first Zener diode ZD1, and the first capacitor C1 stops. The voltage on the first capacitor C1 drops, and at the same time, the voltage at point B also drops. When the voltage at point B is insufficient to break down the second Zener diode ZD2 through the second resistor R2, the second transistor Q2 is cut off. The first power supply circuit 104 can no longer supply power to the auxiliary power supply chip U1 through the second transistor Q2. The voltage on the second capacitor C2 also drops and falls below the breakdown voltage of the third Zener diode ZD3. The third transistor Q3 is also in the cut-off state, and the power supply from VCC to other power supply lines also stops. When the voltage on the first capacitor C1 continues to drop to the undervoltage protection point of the auxiliary power supply chip U1, the auxiliary power supply chip U1 stops working. At this time, even if the VPFC voltage on the second energy storage capacitor has sufficient energy, the main power supply output circuit 109 also quickly stops outputting because the auxiliary power supply chip U1 has stopped working. It should be noted that when shutting down, because the voltage at point B drops first, it cannot break down the second Zener diode ZD2. Therefore, the second transistor Q2 is cut off, and the auxiliary power supply chip U1 cannot obtain a stable power supply voltage. Then, the voltage at point A drops, it cannot break down the third Zener diode ZD3, and the third transistor Q3 is cut off. The third energy storage capacitor CE3 (electrolytic capacitor), which loses power slowly, is disconnected from the power supply network and no longer supplies power to VCC. Therefore, both the auxiliary power supply chip U1 and other chips in the power supply line will reset to their initial state.

[0061] The working principle of repeated switching:

[0062] When the power is repeatedly switched on and off, i.e. when AC is input again, all the chips start up according to the power-on sequence. The charge on the third energy storage capacitor CE3 will only enter the normal working state when the voltage on the second capacitor C2 is sufficient to break down the third Zener diode ZD3. Therefore, there will be no restart phenomenon.

[0063] Furthermore, this utility model also provides an electronic device, which includes the independent auxiliary power source circuit disclosed in the embodiments of this utility model. By setting this independent auxiliary power source circuit, the electronic device can meet the requirement of rapid power-off, realizing rapid power-off of the main output and the auxiliary power supply VCC and main output power supply VDD, and there will be no restarting phenomenon during continuous power-on and power-off. This electronic device may include, but is not limited to, LED power supplies, application devices (such as application power supplies), or products with rapid power-off requirements.

[0064] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They do not limit the scope of protection of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should fall within the scope of the claims of this utility model.

Claims

1. An independent auxiliary source circuit, characterized in that, include: Rectifier bridge, startup circuit, auxiliary source controller, auxiliary power supply circuit, first voltage regulator and current amplification circuit, and second voltage regulator and current amplification circuit; The input terminal of the rectifier bridge is connected to the AC input terminal, and the output terminal of the rectifier bridge is connected to the input terminal of the startup circuit. The first output terminal of the startup circuit is connected to the power supply terminal of the auxiliary power source controller. The input terminal of the first voltage regulator and current amplification circuit is connected to the first output terminal of the auxiliary power supply circuit, and the output terminal of the first voltage regulator and current amplification circuit is connected to the power supply terminal of the auxiliary power source controller. The control terminal of the first voltage regulator and current amplification circuit is connected to the second output terminal of the startup circuit. The input terminal of the second voltage regulator and current amplification circuit is connected to the second output terminal of the auxiliary power supply circuit, and the output terminal of the second voltage regulator and current amplification circuit is connected to other power supply lines. The control terminal of the second voltage regulator and current amplification circuit is connected to the first output terminal of the auxiliary power supply circuit. The startup circuit is used to provide a startup voltage to the auxiliary source controller during startup and to quickly disconnect the power supply during shutdown; The auxiliary power supply circuit is used to provide power after entering a stable working state, and provides a stable working voltage to the auxiliary source controller through the first voltage regulator and current amplification circuit, and provides a stable working voltage to other power supply lines through the second voltage regulator and current amplification circuit. When the power is off, both the first voltage regulator and current amplification circuit and the second voltage regulator and current amplification circuit are cut off.

2. The independent auxiliary source circuit according to claim 1, characterized in that, The auxiliary power supply circuit includes: a first power supply circuit, a second power supply circuit, and an auxiliary power supply. The input terminals of the first power supply circuit and the second power supply circuit are connected to the output terminal of the auxiliary power supply. The output terminal of the first power supply circuit is connected to the input terminal of the first voltage regulator and current amplifier circuit and the control terminal of the second voltage regulator and current amplifier circuit, respectively. The output terminal of the second power supply circuit is connected to the input terminal of the second voltage regulator and current amplifier circuit.

3. The independent auxiliary source circuit according to claim 2, characterized in that, The startup circuit includes: a first resistor, a first Zener diode, and a first capacitor; The input terminal of the first resistor is connected to the output terminal of the rectifier bridge, the output terminal of the first resistor is connected to the negative terminal of the first Zener diode and connected to the control terminal of the first voltage regulator and current amplification circuit, the positive terminal of the first Zener diode is connected to the input terminal of the first capacitor, the output terminal of the first capacitor is grounded, and the input terminal of the first capacitor is also connected to the power supply terminal of the auxiliary source controller.

4. The stand-alone auxiliary source circuit of claim 3, wherein, The first power supply circuit includes: a fourth diode and a second capacitor; the auxiliary power supply includes: an auxiliary winding; The positive terminal of the fourth diode is connected to the output terminal of the auxiliary winding, and the negative terminal of the fourth diode is connected to the input terminal of the second capacitor and to the input terminal of the first voltage regulator and current amplification circuit.

5. The independent auxiliary source circuit according to claim 4, characterized in that, The first voltage regulator and current amplification circuit includes: a second resistor, a second Zener diode, a third resistor, a second transistor, and a third diode; The input terminal of the second resistor is connected to the output terminal of the first resistor. The output terminal of the second resistor is connected to the negative terminal of the second Zener diode and the input terminal of the third resistor. The positive terminal of the second Zener diode is grounded. The output terminal of the third resistor is connected to the base of the second transistor. The emitter of the second transistor is connected to the positive terminal of the third diode. The negative terminal of the third diode is connected to the power supply terminal of the auxiliary source controller. The collector of the second transistor is connected to the input terminal of the second capacitor. The input terminal of the second capacitor is the control terminal of the first voltage regulator and current amplification circuit, and the input terminal of the second capacitor is the output terminal of the first power supply circuit.

6. The stand-alone auxiliary source circuit of claim 2, wherein, The second power supply circuit includes: a sixth diode and a third energy storage capacitor; The positive terminal of the sixth diode is connected to the output terminal of the auxiliary power supply, the negative terminal of the sixth diode is connected to the input terminal of the third energy storage capacitor and the input terminal of the second voltage regulator and current amplification circuit, and the output terminal of the third energy storage capacitor is grounded.

7. The stand-alone auxiliary source circuit of claim 6, wherein, The second voltage regulator and current amplification circuit includes: a fourth resistor, a third Zener diode, a fifth diode, a third transistor, and a third capacitor; The input terminal of the fourth resistor is connected to the output terminal of the first power supply circuit. The output terminal of the fourth resistor is connected to the negative terminal of the third Zener diode and the base of the third transistor. The positive terminal of the third Zener diode is grounded. The emitter of the third transistor is connected to the input terminal of the third capacitor. The collector of the third transistor is connected to the negative terminal of the fifth diode. The anode of the fifth diode is connected to the input terminal of the third energy storage capacitor. The input terminal of the third capacitor is also connected to the other power supply lines. The output terminal of the third capacitor is grounded. The input terminal of the third capacitor is the output terminal of the second voltage regulator and current amplification circuit.

8. The independent auxiliary source circuit according to any one of claims 1-7, characterized in that, Also includes: Main power supply and main power output circuit; The input terminal of the main power supply is connected to the output terminal of the rectifier bridge through a PFC input circuit, and the output terminal of the main power supply is connected to the control terminal of the auxiliary source controller. The main power supply output circuit is coupled to the main power supply and generates the main power supply voltage.

9. The independent auxiliary source circuit according to claim 8, characterized in that, The main power supply includes a main winding; the main power supply output circuit includes a main output winding, a second diode, and a first energy storage capacitor. The main winding is connected to the output terminal of the rectifier bridge through the PFC input circuit. The main output winding is coupled to the main winding. The positive terminal of the second diode is connected to the output terminal of the main output winding, and the negative terminal of the second diode is connected to the input terminal of the first energy storage capacitor. The output terminal of the first energy storage capacitor is grounded, and the input terminal of the first energy storage capacitor generates the main power supply voltage.

10. An electronic device, comprising: include: The independent auxiliary source circuit according to any one of claims 1-9.

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