Ultra-low power consumption quick start circuit of power adapter

Abstract

The utility model discloses an ultra-low power consumption quick starting circuit of a power adapter, which comprises a high-voltage power supply end HV and an accelerated charging starting circuit connected with the high-voltage power supply end HV, and the accelerated charging starting circuit is connected with an after-starting turn-off charging circuit. The acceleration charging starting circuit is composed of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor CE1, a capacitor C1, a capacitor CE3 and an MOS tube Q1, the resistor R1 and the resistor R2 are connected in series and then connected with the capacitor CE1 in parallel, one end of the resistor R3 is connected with the capacitor CE1 and the resistor R2, and the other end of the resistor R3 is connected with the grid electrode of the capacitor C1 and the grid electrode of the MOS tube Q1. The resistor R4 and the resistor R5 are connected in series, and one end, far away from the resistor R5, of the resistor R4 is respectively connected with the capacitor CE1, the resistor R1 and the high-voltage power supply end HV. According to the utility model, the accelerated charging starting circuit and the after-starting turn-off charging circuit are combined, so that the charging loss is reduced, and the adapter meets the requirements that the starting time is less than 0.5 s, the European standard six-level energy efficiency is met, and the no-load power consumption is less than 0.1 W and 230Vac.

Description

Technical Field

[0001] This utility model relates to a startup circuit, specifically an ultra-low power consumption fast startup circuit for a power adapter. Background Technology

[0002] Adapters are ubiquitous in our daily lives, serving as essential power supply devices for electronic products. Whether it's household appliances or devices like mobile phones and rechargeable batteries, all require a suitable adapter to convert high-voltage AC mains power into the low-voltage DC power needed by the device. Adapters typically contain a PWM IC chip. Driving this PWM IC chip requires an adapter IC startup circuit. Traditional adapter IC startup circuits, such as... Figure 1 As shown, the high-voltage terminal HV after rectifier bridge is connected to resistors R20 and R21 in sequence, and then connected to the output power supply terminal VCC. An electrolytic capacitor CE7 is connected to the end of resistor R21 furthest from resistor R20. The advantage of this circuit is its simplicity, but its disadvantages are: if the values ​​of resistors R20 and R21 are large, the charging time of electrolytic capacitor CE7 is long, resulting in a slow circuit startup; if the values ​​of resistors R20 and R21 are small, the charging time of electrolytic capacitor CE7 is short, resulting in a faster circuit startup, but the power loss of resistors R20 and R21 is large, making it difficult to balance startup time and power consumption. If a startup time of <0.5s and compliance with European standard level VI energy efficiency and no-load power consumption of <0.1W@230Vac are required, this circuit is difficult to achieve. Therefore, the inventor designed an ultra-low power fast startup circuit for a power adapter. Utility Model Content

[0003] The purpose of this invention is to provide an ultra-low power consumption fast start-up circuit for a power adapter. By combining an accelerated charging start-up circuit and a start-up shutdown charging circuit, charging loss is reduced, enabling the adapter to meet the requirements of a start-up time of <0.5s and European standard level VI energy efficiency and no-load power consumption of <0.1W@230Vac, thus solving the problems mentioned in the above technical background.

[0004] To achieve the above object, the utility model provides the following technical scheme: a power adapter super low power consumption quick start circuit, including high voltage power supply end HV and the acceleration charging start -up circuit that is connected with high voltage power supply end HV, be connected with the start -up after the acceleration charging start -up circuit off the charging circuit, and the acceleration charging start -up circuit is by resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, electric capacity CE1, electric capacity C1, electric capacity CE3, and MOS tube Q1 constitutes, wherein resistance R1, resistance R2 are connected in series and then are connected in parallel with electric capacity CE1, one end of resistance R3 is connected with electric capacity CE1 and resistance R2, and the other end is respectively connected with electric capacity C1 and the gate of MOS tube Q1;Resistance R4 and resistance R5 are connected in series, and one end of resistance R4 away from resistance R5 is connected with electric capacity CE1, resistance R1 and high voltage power supply end HV respectively, one end of resistance R5 away from resistance R4 is connected with the drain of MOS tube Q1, the source of MOS tube Q1 is connected with electric capacity CE3, one end of electric capacity CE3 away from MOS tube Q1 is grounded, the start -up after the acceleration charging start -up circuit off the charging circuit includes resistance R7, resistance R8, resistance R9, diode D2, diode ZD1, triode Q2 and transformer T1 power supply auxiliary winding, wherein one end of transformer T1 power supply auxiliary winding is grounded, and the other end is connected with diode D2, diode D2 is connected with resistance R9 in series, and one end of resistance R9 away from diode D2 is connected with diode ZD1, electric capacity CE3 and the source of MOS tube Q1 respectively, the emitter and the collector of triode Q2 are connected with the two ends of electric capacity C1 respectively, the base of triode Q2 is connected with resistance R7 and resistance R8 respectively, one end of resistance R7 away from triode Q2 is connected with diode ZD1, one end of resistance R8 away from resistance R7 is grounded.

[0005] Preferably, it further comprises a power supply output end VCC, which is electrically connected with the acceleration charging start-up circuit and the start-up after off charging circuit respectively, and the power supply output end VCC supplies power to the IC end of the power adapter.

[0006] Preferably, one end of the electric capacity C1 away from the resistance R3 and the MOS tube Q1 is grounded.

[0007] Preferably, the electric capacity CE1 and the electric capacity CE3 are both charge-discharge capacitors.

[0008] Preferably, the triode Q2 is an NPN transistor.

[0009] Compared with the prior art, the utility model has the beneficial effects as follows:

[0010] 1.The utility model provides a kind of power adapter ultra-low power consumption fast start circuit, the power adapter ultra-low power consumption fast start circuit includes high voltage power supply end HV and the acceleration charging start-up circuit being connected with high voltage power supply end HV, there is start-up after shutdown charging circuit being connected on acceleration charging start-up circuit, by using acceleration charging start-up circuit and start-up after shutdown charging circuit are compounded, reduce charging loss, so that adapter satisfies start time <0.5s, and satisfy European regulation six level energy efficiency, the requirement of no-load power consumption <0.1W@230Vac. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 For the power adapter start-up circuit in the prior art;

[0012] Figure 2 For the principle block diagram of the utility model;

[0013] Figure 3 For the circuit schematic diagram of the utility model.

[0014] The reference signs and names in the drawings are as follows:

[0015] 1, high voltage power supply end HV;2, acceleration charging start-up circuit;3, start-up after shutdown charging circuit;4, power supply output end VCC. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0017] In the description of the embodiments of the utility model, it should be understood that the orientation or position relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the utility model and simplifying the description, and does not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, so it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0018] In the embodiments of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0019] Please refer to Figure 2 The utility model provides a kind of embodiment: a power adapter ultra-low power consumption fast start circuit, the fast start circuit includes high voltage power supply end HV1 and the accelerating charging start circuit 2 connected with high voltage power supply end HV1, the accelerating charging start circuit 2 is connected with start-off cut-off charging circuit 3, the fast start circuit further includes power supply output end VCC4, the power supply output end VCC4 is electrically connected with accelerating charging start circuit 2 and start-off cut-off charging circuit 3 respectively, and power supply output end VCC4 supplies power to the IC end of power adapter.

[0020] Please refer to Figure 3 , accelerating charging start circuit 2 in figure is composed of resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, capacitor CE1, capacitor C1, capacitor CE3 and MOS tube Q1, wherein resistance R1 and resistance R2 are connected in series and then connected in parallel with capacitor CE1, one end of resistance R3 is connected with capacitor CE1 and resistance R2, and the other end is respectively connected with capacitor C1 and the gate of MOS tube Q1;Resistance R4 and resistance R5 are connected in series, and the end of resistance R4 away from resistance R5 is respectively connected with capacitor CE1, resistance R1 and high voltage power supply end HV1, the end of resistance R5 away from resistance R4 is connected with the drain of MOS tube Q1, the source of MOS tube Q1 is connected with capacitor CE3, and the end of capacitor CE3 away from MOS tube Q1 is grounded, start-off cut-off charging circuit 3 includes resistance R7, resistance R8, resistance R9, diode D2, diode ZD1, triode Q2 and transformer T1 power supply auxiliary winding, wherein one end of transformer T1 power supply auxiliary winding is grounded, and the other end is connected with diode D2, diode D2 is connected with resistance R9 in series, and the end of resistance R9 away from diode D2 is respectively connected with diode ZD1, capacitor CE3 and the source of MOS tube Q1, the emitter and collector of triode Q2 are respectively connected with the two ends of capacitor C1, the base of triode Q2 is respectively connected with resistance R7 and resistance R8, the end of resistance R7 away from triode Q2 is connected with diode ZD1, and the end of resistance R8 away from resistance R7 is grounded.

[0021] Specific, the capacitor C1 away from the resistance R3 and MOS tube Q1 one end ground.

[0022] Specific, the capacitor CE1 and capacitor CE3 are charge and discharge capacitors.

[0023] Specific, the triode Q2 is NPN type transistor.

[0024] Again, refer to Figure 3 When the power adapter starts, the AC voltage rises instantaneously, the voltage on the high voltage supply end HV1 follows, and the capacitor CE1 will be charged at the same time due to the characteristic of the capacitor CE1 that impedes AC and passes DC, so the bypass resistor R1 and the resistor R2 are not working instantaneously, the current passes through the capacitor CE1, the resistor R3, the capacitor C1, and then the MOS tube Q1 gate, and the MOS tube Q1 is turned on. Since the MOS tube Q1 can pass a large current, the resistance R4 and the resistance R5 are usually 56KΩ, and are connected in series to charge the capacitor CE3. Since the resistance is small and the charging current is large, the charging time is very short and can reach the voltage threshold of the adapter IC, and the PWM IC starts the PWM circuit to work. When the capacitor CE1 is fully charged, the current cannot pass through, and the resistor R1, the resistor R2 and the resistor R3 are connected in series to the MOS tube Q1 gate. Since the MOS tube Q1 has been turned on before, the resistance R1 and the resistance R2 can have a large value, and only need to maintain the voltage. Therefore, the resistance R1 and the resistance R2 are usually about 2.5MΩ, and the power loss of the resistance R1+resistor R2+resistor R3 is very small.

[0025] Specific, when the VCC capacitor CE3 charging voltage is greater than the PWM IC working voltage threshold, the PWM circuit starts to work, and the auxiliary winding T1B of the transformer generates a high-frequency alternating voltage, which is rectified by the diode D2 and limited by the resistor R9 to charge the VCC. At this time, the VCC power supply becomes a stable DC voltage. At this time, the VCC voltage is passed through the diode ZD1, which is a voltage stabilizing diode in this embodiment. The diode ZD1 is used to set the voltage difference between the voltage supplied by the auxiliary winding T1B and the starting threshold voltage. The diode ZD1 is set to a reasonable parameter, and does not conduct at the starting moment. After the VCC works stably, the base of the series resistor R7 and the resistor R8 of the triode Q2 works, and the triode Q2 is turned on, pulling the MOS tube Q1 gate to a low level, turning off the MOS tube Q1, and stopping the resistor R4 and the resistor R5 from working. The resistor R4 and the resistor R5 do not produce power loss at this time. Only the resistance R1+resistor R2+resistor R3 has power loss. Since the resistance R1+resistor R2+resistor R3 has a very large resistance value, the circuit VCC has very small loss after working stably.

[0026] The following will be described in detail by a set of experimental data:

[0027] Please refer to Figure 1, the traditional adapter charging circuit, such as VCC capacitor CE7 with 4.7UF, needs to be done <0.5 seconds to start the state, the resistance R20+resistance R21 value needs to be in 750KΩ, all in the input of 230Vac, U=230V*1.414=325V, P=U*U / R calculate the loss P=0.14W, can not meet the European six level energy efficiency, and stable work after resistance R20 and resistance R21 always in series, loss always exist.

[0028] Please refer to Figure 3 , such as VCC capacitor CE3 with 4.7UF only in the moment of partial loss, start stable only resistance R1+resistance R2+resistance R3 loss, 3 resistance value is about 5.1MΩ, according to 230Vac input, U=230V*1.414=325V, P=U*U / R calculate the loss P=0.021W, only 1 / 7 of the traditional circuit loss, plus the loss of other circuit of the adapter, can be far less than the European six level energy efficiency standard, to start time <0.5 seconds, and meet the energy efficiency standard effect.

[0029] For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A power adapter ultra-low power fast start-up circuit, characterized in that: The device includes a high-voltage power supply terminal HV (1) and an accelerated charging start-up circuit (2) connected to the high-voltage power supply terminal HV (1). The accelerated charging start-up circuit (2) is connected to a start-up and then shutdown charging circuit (3). The accelerated charging start-up circuit (2) is composed of resistors R1, R2, R3, R4, R5, capacitors CE1, C1, CE3, and MOS transistor Q1. Resistors R1 and R2 are connected in series and then in parallel with capacitor CE1. One end of resistor R3 is connected to capacitor CE1 and resistor R2, and the other end is connected to capacitor C1 and the gate of MOS transistor Q1. Resistors R4 and R5 are connected in series, and the end of resistor R4 away from resistor R5 is connected to capacitor CE1, resistor R1, and the high-voltage power supply terminal HV (1). The end of resistor R5 away from resistor R4 is connected to the drain of MOS transistor Q1. The source of the MOS transistor Q1 is connected to the capacitor CE3. The end of the capacitor CE3 away from the MOS transistor Q1 is grounded. The start-up shutdown charging circuit (3) includes resistors R7, R8, and R9, diode D2, diode ZD1, transistor Q2, and transformer T1 power supply auxiliary winding. One end of the transformer T1 power supply auxiliary winding is grounded, and the other end is connected to diode D2. Diode D2 is connected in series with resistor R9. The end of resistor R9 away from diode D2 is connected to diode ZD1, capacitor CE3, and the source of MOS transistor Q1. The emitter and collector of transistor Q2 are connected to the two ends of capacitor C1. The base of transistor Q2 is connected to resistors R7 and R8. The end of resistor R7 away from transistor Q2 is connected to diode ZD1. The end of resistor R8 away from resistor R7 is grounded.

2. The ultra-low power consumption fast start-up circuit for a power adapter according to claim 1, characterized in that: It also includes a power supply output terminal VCC (4), which is electrically connected to the accelerated charging start circuit (2) and the start-up and shutdown charging circuit (3), and the power supply output terminal VCC (4) supplies power to the IC terminal of the power adapter.

3. The ultra-low power consumption fast start-up circuit for a power adapter according to claim 1, characterized in that: The capacitor C1 is grounded at the end furthest from resistor R3 and MOSFET Q1.

4. The ultra-low power fast start-up circuit for a power adapter according to claim 1, characterized in that: Both capacitors CE1 and CE3 are charge / discharge capacitors.

5. The ultra-low power fast start-up circuit for a power adapter according to claim 1, characterized in that: The transistor Q2 is an NPN type transistor.

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