技术领域technical field
本实用新型属于LED驱动技术领域，具体涉及一种高功率因数低压无频闪LED线性驱动电路。The utility model belongs to the technical field of LED driving, in particular to a high power factor low-voltage non-stroboscopic LED linear driving circuit.
背景技术Background technique
LED作为一种高效的新光源，由于具有寿命长，能耗低，节能环保，正广泛应用于各领域照明。LED的点亮需要驱动电路进行驱动。由于LED的负载特性导致，传统线性LED驱动电路无法在实现在维持系统较高的功率因数下同时实现无频闪的特点。As an efficient new light source, LED is widely used in lighting in various fields due to its long life, low energy consumption, energy saving and environmental protection. The lighting of the LED requires a driving circuit to drive it. Due to the load characteristics of the LED, the traditional linear LED drive circuit cannot realize the characteristics of flicker-free while maintaining a high power factor of the system.
实用新型内容Utility model content
为了解决上述技术问题，本实用新型提出了一种高功率因数低压无频闪LED线性驱动电路。本实用新型涉及到的拓扑结构允许使用低正向导通压降的LED负载，极大的降低了成本。In order to solve the above-mentioned technical problems, the utility model proposes a high power factor low-voltage flicker-free LED linear drive circuit. The topological structure involved in the utility model allows the use of LED loads with low forward conduction voltage drop, which greatly reduces the cost.
为了达到上述目的，本实用新型的技术方案如下：In order to achieve the above object, the technical scheme of the utility model is as follows:
一种高功率因数低压无频闪LED线性驱动电路，包括：A high power factor low-voltage flicker-free LED linear drive circuit, including:
电压源，用于为LED供电；A voltage source for powering the LEDs;
负载电路，包括：一个或多个串联的LED，其通过第二开关电路与第一开关电路并联；a load circuit comprising: one or more LEDs connected in series, connected in parallel to the first switch circuit via a second switch circuit;
第一电流限制电路，其与负载电路串联；a first current limiting circuit in series with the load circuit;
储能电路，其通过第二开关电路与第一电流限制电路并联；an energy storage circuit connected in parallel with the first current limiting circuit via the second switch circuit;
第二电流限制电路，其与第二开关电路串联，负载电路通过串联后的第二开关电路和第二电流限制电路，再与第一开关电路并联，或，其与负载电路串联，串联后的负载电路和第二电流限制电路，再与第一开关电路并联；The second current limiting circuit is connected in series with the second switch circuit, and the load circuit is connected in parallel with the first switch circuit through the second switch circuit and the second current limiting circuit connected in series, or it is connected in series with the load circuit, and the connected in series The load circuit and the second current limiting circuit are connected in parallel with the first switch circuit;
当电压源输入电压较低时，所述第一开关电路导通，所述第二开关电路关断，所述第一电流限制电路工作在恒流状态，所述储能电路与负载电路并联，所述储能电路对所述负载电路放电，且所述储能电路对所述负载电路供电；When the input voltage of the voltage source is low, the first switch circuit is turned on, the second switch circuit is turned off, the first current limiting circuit works in a constant current state, the energy storage circuit is connected in parallel with the load circuit, the energy storage circuit discharges the load circuit, and the energy storage circuit supplies power to the load circuit;
当电压源输入电压较高时，所述第一开关电路关断，所述第二开关电路导通，所述第一电流限制电路工作在关断状态，所述第二电流限制电路工作在恒流状态，控制系统的总能量输入，所述储能电路与负载电路串联，所述电压源为所述负载电路供电，且所述电压源对所述储能电路充电。When the input voltage of the voltage source is high, the first switch circuit is turned off, the second switch circuit is turned on, the first current limiting circuit works in an off state, and the second current limiting circuit works in a constant state. The flow state controls the total energy input of the system, the energy storage circuit is connected in series with the load circuit, the voltage source supplies power to the load circuit, and the voltage source charges the energy storage circuit.
本实用新型一种高功率因数低压无频闪LED线性驱动电路结构简单，成本低，此结构使得在高输入电压条件下允许使用低压灯珠，低压灯珠的正向导通压降小于输入峰值电压的一半，大大降低了系统成本。同时保持了较高的功率因数和无频闪特性。The utility model has a high power factor low-voltage non-stroboscopic LED linear drive circuit with simple structure and low cost. This structure allows the use of low-voltage lamp beads under high input voltage conditions, and the forward conduction voltage drop of the low-voltage lamp beads is smaller than the input peak voltage. half of that, greatly reducing the system cost. At the same time, it maintains a high power factor and no flicker characteristics.
在上述技术方案的基础上，还可做如下改进：On the basis of the above-mentioned technical scheme, the following improvements can also be made:
作为优选的方案，第一电流限制电路包括：串联设置的恒流源I1和限流采样电阻R1。As a preferred solution, the first current limiting circuit includes: a constant current source I1 and a current limiting sampling resistor R1 arranged in series.
采用上述优选的方案，结构简单，成本低。Adopting the above preferred solution, the structure is simple and the cost is low.
作为优选的方案，第二电流限制电路包括：串联设置的恒流源I2和限流采样电阻R2。As a preferred solution, the second current limiting circuit includes: a constant current source I2 and a current limiting sampling resistor R2 arranged in series.
采用上述优选的方案，结构简单，成本低Adopting the above preferred scheme, the structure is simple and the cost is low
作为优选的方案，储能电路包括：一个或多个并联的电容C。As a preferred solution, the energy storage circuit includes: one or more capacitors C connected in parallel.
采用上述优选的方案，结构简单，采用多个并联的电容C时，其储电量更大。With the above preferred solution, the structure is simple, and when a plurality of capacitors C connected in parallel are used, the storage capacity thereof is larger.
作为优选的方案，恒流源I1包括：放大器和功率管，该放大器的正向输入端与基准电压Vref1连接，其反向输入端与限流采样电阻R1连接，其输出端与功率管连接。As a preferred solution, the constant current source I1 includes: an amplifier and a power tube. The positive input terminal of the amplifier is connected to the reference voltage Vref1, the negative input terminal is connected to the current-limiting sampling resistor R1, and the output terminal is connected to the power tube.
采用上述优选的方案，结构简单，且效果好，成本低。Adopting the above preferred solution, the structure is simple, the effect is good, and the cost is low.
作为优选的方案，恒流源I2包括：放大器和功率管，该放大器的正向输入端与基准电压Vref2连接，其反向输入端与限流采样电阻R2连接，其输出端与功率管连接。As a preferred solution, the constant current source I2 includes: an amplifier and a power tube. The positive input terminal of the amplifier is connected to the reference voltage Vref2, the negative input terminal is connected to the current-limiting sampling resistor R2, and the output terminal is connected to the power tube.
采用上述优选的方案，结构简单，且效果好，成本低。Adopting the above preferred solution, the structure is simple, the effect is good, and the cost is low.
作为优选的方案，电压源包括：V+端和V-端；第一开关电路包括：二极管D1；第二开关电路包括：二极管D2；As a preferred solution, the voltage source includes: V+ terminal and V- terminal; the first switch circuit includes: diode D1; the second switch circuit includes: diode D2;
负载电路的一端分别与V+端和二极管D1的负极连接，其另一端与限流采样电阻R1连接；One end of the load circuit is respectively connected to the V+ terminal and the cathode of the diode D1, and the other end is connected to the current-limiting sampling resistor R1;
限流采样电阻R1的一端与负载电路连接，其另一端分别与二极管D2的正极和恒流源I1连接；One end of the current-limiting sampling resistor R1 is connected to the load circuit, and the other end is respectively connected to the anode of the diode D2 and the constant current source I1;
恒流源I1的一端分别与限流采样电阻R1和二极管D2的正极连接，其另一端分别与V-端和储能电路连接；One end of the constant current source I1 is respectively connected to the anode of the current-limiting sampling resistor R1 and the diode D2, and the other end is respectively connected to the V- terminal and the energy storage circuit;
二极管D1的正极分别与第二电流限制电路和储能电路连接，其负极分别与V+端和负载电路连接；The anode of the diode D1 is respectively connected to the second current limiting circuit and the energy storage circuit, and its cathode is respectively connected to the V+ terminal and the load circuit;
二极管D2的正极分别与恒流源I1和限流采样电阻R1连接，其负极与第二电流限制电路连接；The anode of the diode D2 is respectively connected to the constant current source I1 and the current limiting sampling resistor R1, and its cathode is connected to the second current limiting circuit;
储能电路的一端分别与第二电流限制电路和二极管D1的正极连接，其另一端分别与恒流源I1和V-端连接；One end of the energy storage circuit is respectively connected to the second current limiting circuit and the anode of the diode D1, and the other end is respectively connected to the constant current source I1 and the V- terminal;
第二电流限制电路的一端与二极管D2的负极连接，其另一端分别与储能电路和二极管D1的正极连接。One end of the second current limiting circuit is connected to the cathode of the diode D2, and the other end is respectively connected to the energy storage circuit and the anode of the diode D1.
采用上述优选的方案，结构简单。By adopting the above preferred scheme, the structure is simple.
作为优选的方案，电压源包括：V+端和V-端；第一开关电路包括：二极管D1；第二开关电路包括：二极管D2；As a preferred solution, the voltage source includes: V+ terminal and V- terminal; the first switch circuit includes: diode D1; the second switch circuit includes: diode D2;
负载电路的一端分别与V-端和二极管D1的正极连接，其另一端与限流采样电阻R1连接；One end of the load circuit is respectively connected to the V- terminal and the anode of the diode D1, and the other end is connected to the current-limiting sampling resistor R1;
限流采样电阻R1的一端与负载电路连接，其另一端分别与第二电流限制电路和恒流源I1连接；One end of the current-limiting sampling resistor R1 is connected to the load circuit, and the other end is respectively connected to the second current limiting circuit and the constant current source I1;
恒流源I1的一端分别与限流采样电阻R1和第二电流限制电路连接，其另一端分别与V+端和储能电路连接；One end of the constant current source I1 is respectively connected to the current limiting sampling resistor R1 and the second current limiting circuit, and the other end thereof is respectively connected to the V+ terminal and the energy storage circuit;
二极管D1的正极分别与负载电路和V-端连接，其负极分别与二极管D2的正极和储能电路连接；The anode of the diode D1 is respectively connected to the load circuit and the V- terminal, and its cathode is respectively connected to the anode of the diode D2 and the energy storage circuit;
二极管D2的正极分别与储能电路和二极管D1的负极连接，其负极与第二电流限制电路连接；The anode of the diode D2 is respectively connected to the energy storage circuit and the cathode of the diode D1, and its cathode is connected to the second current limiting circuit;
储能电路的一端分别与二极管D1的负极和二极管D2的正极连接，其另一端分别与恒流源I1和V+端连接；One end of the energy storage circuit is respectively connected to the cathode of the diode D1 and the anode of the diode D2, and the other end is respectively connected to the constant current source I1 and the V+ terminal;
第二电流限制电路的一端与二极管D2的负极连接，其另一端分别与限流采样电阻R1和恒流源I1连接。One end of the second current limiting circuit is connected to the cathode of the diode D2, and the other end is respectively connected to the current limiting sampling resistor R1 and the constant current source I1.
采用上述优选的方案，结构简单。By adopting the above preferred scheme, the structure is simple.
作为优选的方案，电压源包括：V+端和V-端；第一开关电路包括：二极管D1；第二开关电路包括：二极管D2；As a preferred solution, the voltage source includes: V+ terminal and V- terminal; the first switch circuit includes: diode D1; the second switch circuit includes: diode D2;
负载电路的一端分别与V+端和二极管D1的负极连接，其另一端与第二电流限制电路连接；One end of the load circuit is respectively connected to the V+ end and the cathode of the diode D1, and the other end is connected to the second current limiting circuit;
第二电流限制电路的一端与负载电路连接，其另一端分别与恒流源I1和二极管D2的正极连接；One end of the second current limiting circuit is connected to the load circuit, and the other end is respectively connected to the constant current source I1 and the anode of the diode D2;
恒流源I1的一端分别与第二电流限制电路和二极管D2的正极连接，其另一端分别与限流采样电阻R1和储能电路连接；One end of the constant current source I1 is respectively connected to the second current limiting circuit and the anode of the diode D2, and the other end is respectively connected to the current limiting sampling resistor R1 and the energy storage circuit;
限流采样电阻R1的一端分别与恒流源I1和储能电路连接，其另一端与V-端连接；One end of the current-limiting sampling resistor R1 is respectively connected to the constant current source I1 and the energy storage circuit, and the other end is connected to the V- terminal;
二极管D1的正极分别与二极管D2的负极和储能电路连接，其负极分别与负载电路和V+端连接；The anode of the diode D1 is respectively connected to the cathode of the diode D2 and the energy storage circuit, and its cathode is respectively connected to the load circuit and the V+ terminal;
二极管D2的正极分别与第二电流限制电路和恒流源I1连接，其负极分别与二极管D1的正极和储能电路连接。The anode of the diode D2 is respectively connected to the second current limiting circuit and the constant current source I1, and its cathode is respectively connected to the anode of the diode D1 and the energy storage circuit.
采用上述优选的方案，结构简单。By adopting the above preferred scheme, the structure is simple.
作为优选的方案，电压源包括：V+端和V-端；第一开关电路包括：二极管D1；第二开关电路包括：二极管D2；As a preferred solution, the voltage source includes: V+ terminal and V- terminal; the first switch circuit includes: diode D1; the second switch circuit includes: diode D2;
负载电路的一端分别与限流采样电阻R1连接，其另一端与第二电流限制电路连接；One end of the load circuit is respectively connected to the current limiting sampling resistor R1, and the other end is connected to the second current limiting circuit;
第二电流限制电路的一端与负载电路连接，其另一端分别与二极管D1的正极和V-端连接；One end of the second current limiting circuit is connected to the load circuit, and the other end is respectively connected to the anode and V-terminal of the diode D1;
恒流源I1的一端分别与二极管D2的负极和限流采样电阻R1连接，其另一端分别与V+端和储能电路连接；One end of the constant current source I1 is respectively connected to the cathode of the diode D2 and the current-limiting sampling resistor R1, and the other end is respectively connected to the V+ end and the energy storage circuit;
限流采样电阻R1的一端分别与恒流源I1和二极管D2的负极连接，其另一端与负载电路连接；One end of the current-limiting sampling resistor R1 is respectively connected to the constant current source I1 and the cathode of the diode D2, and the other end is connected to the load circuit;
二极管D1的正极分别与V-端和第二电流限制电路连接，其负极分别与储能电路和二极管D2的正极连接；The anode of the diode D1 is respectively connected to the V- terminal and the second current limiting circuit, and its cathode is respectively connected to the energy storage circuit and the anode of the diode D2;
二极管D2的正极分别与二极管D1的负极和储能电路连接，其负极分别与恒流源I1和限流采样电阻R1连接。The anode of the diode D2 is respectively connected to the cathode of the diode D1 and the energy storage circuit, and its cathode is respectively connected to the constant current source I1 and the current-limiting sampling resistor R1.
采用上述优选的方案，结构简单。By adopting the above preferred scheme, the structure is simple.
附图说明Description of drawings
图1为本实用新型实施例提供的一种高功率因数低压无频闪LED线性驱动电路的结构框图之一。FIG. 1 is one of the structural block diagrams of a high power factor low-voltage flicker-free LED linear drive circuit provided by an embodiment of the present invention.
图2为本实用新型实施例提供的图1结构框图下的电路图之一。Fig. 2 is one of the circuit diagrams under the structural block diagram in Fig. 1 provided by the embodiment of the present invention.
图3为本实用新型实施例提供的图1结构框图下的电路图之二。Fig. 3 is the second circuit diagram under the block diagram of Fig. 1 provided by the embodiment of the present invention.
图4为本实用新型实施例提供的一种高功率因数低压无频闪LED线性驱动电路的结构框图之二。FIG. 4 is the second structural block diagram of a high power factor low-voltage flicker-free LED linear drive circuit provided by an embodiment of the present invention.
图5为本实用新型实施例提供的图4结构框图下的电路图之一。FIG. 5 is one of the circuit diagrams under the structural block diagram in FIG. 4 provided by the embodiment of the present invention.
图6为本实用新型实施例提供的图4结构框图下的电路图之二。Fig. 6 is the second circuit diagram under the structural block diagram in Fig. 4 provided by the embodiment of the present invention.
图7为本实用新型实施例提供的第一电流限制电路的具体电路图。FIG. 7 is a specific circuit diagram of the first current limiting circuit provided by the embodiment of the present invention.
图8为本实用新型实施例提供的第二电流限制电路的具体电路图。FIG. 8 is a specific circuit diagram of the second current limiting circuit provided by the embodiment of the present invention.
其中：1、负载电路，2、第一电流限制电路，3、储能电路，4、第二电流限制电路，5、第一开关电路，6、第二开关电路，7、电压源。Among them: 1. Load circuit, 2. First current limiting circuit, 3. Energy storage circuit, 4. Second current limiting circuit, 5. First switching circuit, 6. Second switching circuit, 7. Voltage source.
具体实施方式Detailed ways
下面结合附图详细说明本实用新型的优选实施方式。Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.
为了达到本实用新型的目的，一种高功率因数低压无频闪LED线性驱动电路的其中一些实施例中，如图1所示，一种高功率因数低压无频闪LED线性驱动电路包括：In order to achieve the purpose of this utility model, in some embodiments of a high power factor low-voltage flicker-free LED linear drive circuit, as shown in Figure 1, a high-power factor low-voltage flicker-free LED linear drive circuit includes:
电压源7，用于为LED供电；A voltage source 7 for powering the LED;
负载电路1，包括：一个或多个串联的LED，其通过第二开关电路6与第一开关电路5并联；The load circuit 1 includes: one or more LEDs connected in series, which are connected in parallel with the first switch circuit 5 through the second switch circuit 6;
第一电流限制电路2，其与负载电路1串联；A first current limiting circuit 2, which is connected in series with the load circuit 1;
储能电路3，其通过第二开关电路6与第一电流限制电路2并联；The energy storage circuit 3 is connected in parallel with the first current limiting circuit 2 through the second switch circuit 6;
第二电流限制电路4，其与第二开关电路6串联，负载电路1通过串联后的第二开关电路6和第二电流限制电路4，再与第一开关电路5并联；The second current limiting circuit 4 is connected in series with the second switch circuit 6, and the load circuit 1 is connected in parallel with the first switch circuit 5 through the second switch circuit 6 and the second current limiting circuit 4 connected in series;
当电压源7输入电压较低时，第一开关电路5导通，第二开关电路6关断，第一电流限制电路2工作在恒流状态，第二电流限制电路4工作在关断状态，储能电路3与负载电路1并联，储能电路3对负载电路1放电，且储能电路3对负载电路1供电，实现无频闪效果；When the input voltage of the voltage source 7 is low, the first switch circuit 5 is turned on, the second switch circuit 6 is turned off, the first current limiting circuit 2 works in a constant current state, and the second current limiting circuit 4 works in an off state, The energy storage circuit 3 is connected in parallel with the load circuit 1, the energy storage circuit 3 discharges the load circuit 1, and the energy storage circuit 3 supplies power to the load circuit 1, so as to achieve no stroboscopic effect;
当电压源7输入电压较高时，第一开关电路5关断，第二开关电路6导通，第一电流限制电路2工作关断状态，第二电流限制电路4工作在恒流状态，控制系统的总能量输入，储能电路3与负载电路1串联，电压源7为负载电路1供电，且电压源7对储能电路3充电，实现高功率因数效果。When the input voltage of the voltage source 7 is high, the first switch circuit 5 is turned off, the second switch circuit 6 is turned on, the first current limiting circuit 2 works in the off state, the second current limiting circuit 4 works in the constant current state, and the control For the total energy input of the system, the energy storage circuit 3 is connected in series with the load circuit 1, the voltage source 7 supplies power to the load circuit 1, and the voltage source 7 charges the energy storage circuit 3 to achieve a high power factor effect.
第一电流限制电路2包括：串联设置的恒流源I1和限流采样电阻R1。第二电流限制电路4包括：串联设置的恒流源I2和限流采样电阻R2。The first current limiting circuit 2 includes: a constant current source I1 and a current limiting sampling resistor R1 arranged in series. The second current limiting circuit 4 includes: a constant current source I2 and a current limiting sampling resistor R2 arranged in series.
储能电路3为一个电容C。The energy storage circuit 3 is a capacitor C.
本实用新型中两路恒流系统可自动切换。In the utility model, the two constant current systems can be switched automatically.
本实用新型一种高功率因数低压无频闪LED线性驱动电路结构简单，成本低，此结构使得在高输入电压条件下允许使用低压灯珠，低压灯珠的正向导通压降小于输入峰值电压的一半，大大降低了系统成本。同时保持了较高的功率因数和无频闪特性。The utility model has a high power factor low-voltage non-stroboscopic LED linear drive circuit with simple structure and low cost. This structure allows the use of low-voltage lamp beads under high input voltage conditions, and the forward conduction voltage drop of the low-voltage lamp beads is smaller than the input peak voltage. half of that, greatly reducing the system cost. At the same time, it maintains a high power factor and no flicker characteristics.
如图2所示，进一步，电压源7包括：V+端和V-端；第一开关电路5包括：二极管D1；第二开关电路6包括：二极管D2；As shown in FIG. 2, further, the voltage source 7 includes: a V+ terminal and a V- terminal; the first switch circuit 5 includes: a diode D1; the second switch circuit 6 includes: a diode D2;
负载电路1的一端分别与V+端和二极管D1的负极连接，其另一端与限流采样电阻R1连接；One end of the load circuit 1 is respectively connected to the V+ terminal and the cathode of the diode D1, and the other end is connected to the current-limiting sampling resistor R1;
限流采样电阻R1的一端与负载电路1连接，其另一端分别与二极管D2的正极和恒流源I1连接；One end of the current-limiting sampling resistor R1 is connected to the load circuit 1, and the other end is respectively connected to the anode of the diode D2 and the constant current source I1;
恒流源I1的一端分别与限流采样电阻R1和二极管D2的正极连接，其另一端分别与V-端和电容C连接；One end of the constant current source I1 is respectively connected to the anode of the current-limiting sampling resistor R1 and the diode D2, and the other end is respectively connected to the V- terminal and the capacitor C;
二极管D1的正极分别与第二电流限制电路4和电容C连接，其负极分别与V+端和负载电路1连接；The anode of the diode D1 is respectively connected to the second current limiting circuit 4 and the capacitor C, and its cathode is respectively connected to the V+ terminal and the load circuit 1;
二极管D2的正极分别与恒流源I1和限流采样电阻R1连接，其负极与第二电流限制电路4连接；The anode of the diode D2 is respectively connected to the constant current source I1 and the current limiting sampling resistor R1, and its cathode is connected to the second current limiting circuit 4;
电容C的一端分别与第二电流限制电路4和二极管D1的正极连接，其另一端分别与恒流源I1和V-端连接；One end of the capacitor C is respectively connected to the second current limiting circuit 4 and the anode of the diode D1, and the other end is respectively connected to the constant current source I1 and the V-terminal;
第二电流限制电路4的一端与二极管D2的负极连接，其另一端分别与电容C和二极管D1的正极连接。One end of the second current limiting circuit 4 is connected to the cathode of the diode D2, and the other end is respectively connected to the capacitor C and the anode of the diode D1.
采用上述优选的方案，结构简单。By adopting the above preferred scheme, the structure is simple.
如图3所示，进一步，在其他实施例中，电压源7包括：V+端和V-端；第一开关电路5包括：二极管D1；第二开关电路6包括：二极管D2；As shown in FIG. 3 , further, in other embodiments, the voltage source 7 includes: a V+ terminal and a V- terminal; the first switch circuit 5 includes: a diode D1; the second switch circuit 6 includes: a diode D2;
负载电路1的一端分别与V-端和二极管D1的正极连接，其另一端与限流采样电阻R1连接；One end of the load circuit 1 is respectively connected to the V- terminal and the anode of the diode D1, and the other end is connected to the current-limiting sampling resistor R1;
限流采样电阻R1的一端与负载电路1连接，其另一端分别与第二电流限制电路4和恒流源I1连接；One end of the current-limiting sampling resistor R1 is connected to the load circuit 1, and the other end is respectively connected to the second current limiting circuit 4 and the constant current source I1;
恒流源I1的一端分别与限流采样电阻R1和第二电流限制电路4连接，其另一端分别与V+端和电容C连接；One end of the constant current source I1 is respectively connected to the current limiting sampling resistor R1 and the second current limiting circuit 4, and the other end thereof is connected to the V+ terminal and the capacitor C respectively;
二极管D1的正极分别与负载电路1和V-端连接，其负极分别与二极管D2的正极和电容C连接；The anode of the diode D1 is respectively connected to the load circuit 1 and the V- terminal, and its cathode is respectively connected to the anode of the diode D2 and the capacitor C;
二极管D2的正极分别与电容C和二极管D1的负极连接，其负极与第二电流限制电路4连接；The anode of the diode D2 is respectively connected to the capacitor C and the cathode of the diode D1, and its cathode is connected to the second current limiting circuit 4;
电容C的一端分别与二极管D1的负极和二极管D2的正极连接，其另一端分别与恒流源I1和V+端连接；One end of the capacitor C is respectively connected to the cathode of the diode D1 and the anode of the diode D2, and the other end is respectively connected to the constant current source I1 and the V+ end;
第二电流限制电路4的一端与二极管D2的负极连接，其另一端分别与限流采样电阻R1和恒流源I1连接。One end of the second current limiting circuit 4 is connected to the cathode of the diode D2, and the other end is respectively connected to the current limiting sampling resistor R1 and the constant current source I1.
采用上述优选的方案，结构简单，该实施例的电路结构与上一个实施例的电路结构为对偶结构。Adopting the above preferred solution, the structure is simple, and the circuit structure of this embodiment is a dual structure with that of the previous embodiment.
如图4所示，为了进一步地优化本实用新型的实施效果，在另外一些实施方式中，其余特征技术相同，不同之处在于，第二电流限制电路4与负载电路1串联，串联后的负载电路1和第二电流限制电路4，再与第一开关电路5并联。As shown in Figure 4, in order to further optimize the implementation effect of the present utility model, in some other embodiments, the rest of the characteristic techniques are the same, the difference is that the second current limiting circuit 4 is connected in series with the load circuit 1, and the load after series connection The circuit 1 and the second current limiting circuit 4 are connected in parallel with the first switching circuit 5 .
当电压源7输入电压较低时，第一开关电路5导通，第二开关电路6关断，第一电流限制电路2工作在恒流状态，第二电流限制电路4工作在恒流状态，储能电路3与负载电路1并联，储能电路3对负载电路1放电，且储能电路3对负载电路1供电，实现无频闪效果；When the input voltage of the voltage source 7 is low, the first switch circuit 5 is turned on, the second switch circuit 6 is turned off, the first current limiting circuit 2 works in a constant current state, and the second current limiting circuit 4 works in a constant current state, The energy storage circuit 3 is connected in parallel with the load circuit 1, the energy storage circuit 3 discharges the load circuit 1, and the energy storage circuit 3 supplies power to the load circuit 1, so as to achieve no stroboscopic effect;
当电压源7输入电压较高时，第一开关电路5关断，第二开关电路6导通，第一电流限制电路2工作关断状态，第二电流限制电路4工作在恒流状态，控制系统的总能量输入，储能电路3与负载电路1串联，电压源7为负载电路1供电，且电压源7对储能电路3充电，实现高功率因数效果。When the input voltage of the voltage source 7 is high, the first switch circuit 5 is turned off, the second switch circuit 6 is turned on, the first current limiting circuit 2 works in the off state, the second current limiting circuit 4 works in the constant current state, and the control For the total energy input of the system, the energy storage circuit 3 is connected in series with the load circuit 1, the voltage source 7 supplies power to the load circuit 1, and the voltage source 7 charges the energy storage circuit 3 to achieve a high power factor effect.
采用上述优选的方案，结构更简单。By adopting the above preferred scheme, the structure is simpler.
如图5所示，进一步，电压源7包括：V+端和V-端；第一开关电路5包括：二极管D1；第二开关电路6包括：二极管D2；As shown in FIG. 5, further, the voltage source 7 includes: a V+ terminal and a V- terminal; the first switch circuit 5 includes: a diode D1; the second switch circuit 6 includes: a diode D2;
负载电路1的一端分别与V+端和二极管D1的负极连接，其另一端与第二电流限制电路4连接；One end of the load circuit 1 is respectively connected to the V+ terminal and the cathode of the diode D1, and the other end is connected to the second current limiting circuit 4;
第二电流限制电路4的一端与负载电路1连接，其另一端分别与恒流源I1和二极管D2的正极连接；One end of the second current limiting circuit 4 is connected to the load circuit 1, and the other end is respectively connected to the constant current source I1 and the anode of the diode D2;
恒流源I1的一端分别与第二电流限制电路4和二极管D2的正极连接，其另一端分别与限流采样电阻R1和电容C连接；One end of the constant current source I1 is respectively connected to the anode of the second current limiting circuit 4 and the diode D2, and the other end thereof is respectively connected to the current limiting sampling resistor R1 and the capacitor C;
限流采样电阻R1的一端分别与恒流源I1和电容C连接，其另一端与V-端连接；One end of the current-limiting sampling resistor R1 is respectively connected to the constant current source I1 and the capacitor C, and the other end is connected to the V- terminal;
二极管D1的正极分别与二极管D2的负极和电容C连接，其负极分别与负载电路1和V+端连接；The anode of the diode D1 is respectively connected to the cathode of the diode D2 and the capacitor C, and its cathode is respectively connected to the load circuit 1 and the V+ terminal;
二极管D2的正极分别与第二电流限制电路4和恒流源I1连接，其负极分别与二极管D1的正极和电容C连接。The anode of the diode D2 is respectively connected to the second current limiting circuit 4 and the constant current source I1 , and its cathode is connected to the anode of the diode D1 and the capacitor C respectively.
采用上述优选的方案，结构简单。By adopting the above preferred scheme, the structure is simple.
如图6所示，进一步，在其他实施例中，电压源7包括：V+端和V-端；第一开关电路5包括：二极管D1；第二开关电路6包括：二极管D2；As shown in FIG. 6, further, in other embodiments, the voltage source 7 includes: a V+ terminal and a V- terminal; the first switch circuit 5 includes: a diode D1; the second switch circuit 6 includes: a diode D2;
负载电路1的一端分别与限流采样电阻R1连接，其另一端与第二电流限制电路4连接；One end of the load circuit 1 is respectively connected to the current limiting sampling resistor R1, and the other end thereof is connected to the second current limiting circuit 4;
第二电流限制电路4的一端与负载电路1连接，其另一端分别与二极管D1的正极和V-端连接；One end of the second current limiting circuit 4 is connected to the load circuit 1, and the other end is respectively connected to the anode and V-terminal of the diode D1;
恒流源I1的一端分别与二极管D2的负极和限流采样电阻R1连接，其另一端分别与V+端和电容C连接；One end of the constant current source I1 is respectively connected to the cathode of the diode D2 and the current-limiting sampling resistor R1, and the other end is respectively connected to the V+ terminal and the capacitor C;
限流采样电阻R1的一端分别与恒流源I1和二极管D2的负极连接，其另一端与负载电路1连接；One end of the current-limiting sampling resistor R1 is respectively connected to the constant current source I1 and the cathode of the diode D2, and the other end is connected to the load circuit 1;
二极管D1的正极分别与V-端和第二电流限制电路4连接，其负极分别与储能电路3和二极管D2的正极连接；The anode of the diode D1 is respectively connected to the V- terminal and the second current limiting circuit 4, and its cathode is respectively connected to the energy storage circuit 3 and the anode of the diode D2;
二极管D2的正极分别与二极管D1的负极和电容C连接，其负极分别与恒流源I1和限流采样电阻R1连接。The anode of the diode D2 is respectively connected to the cathode of the diode D1 and the capacitor C, and its cathode is respectively connected to the constant current source I1 and the current-limiting sampling resistor R1.
采用上述优选的方案，结构简单，该实施例的电路结构与上一个实施例的电路结构为对偶结构。Adopting the above preferred solution, the structure is simple, and the circuit structure of this embodiment is a dual structure with that of the previous embodiment.
为了进一步地优化本实用新型的实施效果，在另外一些实施方式中，其余特征技术相同，不同之处在于，电容C包括：多个并联的电容C。In order to further optimize the implementation effect of the present utility model, in some other implementation manners, other features and technologies are the same, except that the capacitor C includes: a plurality of capacitors C connected in parallel.
采用上述优选的方案，结构简单，采用多个并联的电容C时，其储电量更大。With the above preferred solution, the structure is simple, and when a plurality of capacitors C connected in parallel are used, the storage capacity thereof is larger.
如图7所示，为了进一步地优化本实用新型的实施效果，在另外一些实施方式中，其余特征技术相同，不同之处在于，恒流源I1包括：放大器和功率管，该放大器的正向输入端与基准电压Vref1连接，其反向输入端与限流采样电阻R1连接，其输出端与功率管连接。As shown in Figure 7, in order to further optimize the implementation effect of the present utility model, in other embodiments, the rest of the characteristic techniques are the same, the difference is that the constant current source I1 includes: an amplifier and a power tube, and the positive direction of the amplifier The input terminal is connected to the reference voltage Vref1, its inverting input terminal is connected to the current-limiting sampling resistor R1, and its output terminal is connected to the power tube.
该功率管为NMOS晶体管MN101时，MN101的栅极与放大器的输出端连接，MN101的源极与限流采样电阻R1连接，MN101的漏极与外部电路连接。When the power transistor is an NMOS transistor MN101, the gate of the MN101 is connected to the output terminal of the amplifier, the source of the MN101 is connected to the current-limiting sampling resistor R1, and the drain of the MN101 is connected to an external circuit.
采用上述优选的方案，结构简单，且效果好，成本低。Adopting the above preferred solution, the structure is simple, the effect is good, and the cost is low.
如图8所示，为了进一步地优化本实用新型的实施效果，在另外一些实施方式中，其余特征技术相同，不同之处在于，恒流源I2包括：放大器和功率管，该放大器的正向输入端与基准电压Vref2连接，其反向输入端与限流采样电阻R2连接，其输出端与功率管连接。As shown in Figure 8, in order to further optimize the implementation effect of the present utility model, in some other embodiments, the rest of the characteristic techniques are the same, the difference is that the constant current source I2 includes: an amplifier and a power tube, and the positive direction of the amplifier The input terminal is connected to the reference voltage Vref2, its reverse input terminal is connected to the current-limiting sampling resistor R2, and its output terminal is connected to the power tube.
该功率管为NMOS晶体管MN201时，MN201的栅极与放大器的输出端连接，MN201的源极与限流采样电阻R2连接，MN201的漏极与外部电路连接。When the power transistor is an NMOS transistor MN201, the gate of the MN201 is connected to the output terminal of the amplifier, the source of the MN201 is connected to the current-limiting sampling resistor R2, and the drain of the MN201 is connected to an external circuit.
采用上述优选的方案，结构简单，且效果好，成本低。Adopting the above preferred solution, the structure is simple, the effect is good, and the cost is low.
对于本实用新型的优选实施方式，应当指出，对于本领域的普通技术人员来说，在不脱离本实用新型创造构思的前提下，还可以做出若干变形和改进，这些都属于本实用新型的保护范围。For the preferred implementation of the present utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the present utility model, some deformations and improvements can also be made, and these all belong to the scope of the present utility model. protected range.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721868269.7UCN207854229U (en) | 2017-12-27 | 2017-12-27 | A high power factor low-voltage flicker-free LED linear drive circuit |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721868269.7UCN207854229U (en) | 2017-12-27 | 2017-12-27 | A high power factor low-voltage flicker-free LED linear drive circuit |
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| CN207854229Utrue CN207854229U (en) | 2018-09-11 |
| Application Number | Title | Priority Date | Filing Date |
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| CN201721868269.7UExpired - Fee RelatedCN207854229U (en) | 2017-12-27 | 2017-12-27 | A high power factor low-voltage flicker-free LED linear drive circuit |
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