CN210469822U

CN210469822U - Segmented LED drive circuit with loss input current waveform compensation unit

Info

Publication number: CN210469822U
Application number: CN201920605901.1U
Authority: CN
Inventors: 陈怡�; 陈信勇; 谢路耀; 郭鑫
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-05-05
Anticipated expiration: 2029-04-29

Abstract

A sectional type LED drive circuit with a loss input current waveform compensation unit comprises a rectification circuit, a controlled current source 1 to a controlled current source N + X, a controller and a loss compensation unit a; or, the circuit comprises a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a lossy compensation unit a; or the circuit comprises a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a loss compensation unit b; the lossy compensation unit a or the lossy compensation unit b has the function of enabling the segmented LED driving circuit with few segments to obtain the performances of high PF, low THDi and low input current harmonic components in both lighting and VLC modes. When the cooperation is used the optimization method, the utility model discloses can realize the efficiency maximize under lighting mode.

Description

Segmented LED drive circuit with loss input current waveform compensation unit

Technical Field

The utility model relates to a sectional type LED drive circuit, especially a contain and decrease sectional type LED drive circuit of input current waveform compensation unit can realize high PF (power factor), low THDi (input current total distortion rate), low input current harmonic component and high efficiency simultaneously when adopting the optimization method, is applicable to the application scenario of high performance.

Background

Aiming at the application occasions of the kilowatt-level alternating current input, the sectional type LED driving circuit has higher cost performance than the traditional switch type LED driving circuit. Essentially, the segmented LED driving circuit consists essentially of a controlled current source. The segmented LED driving circuit is divided by the number of controlled current sources and can be classified into two typical types, a multi-current power supply type and a single-current power supply type.

Since the number of segments of the segmented LED driving circuit is directly related to cost and control difficulty, a small number of segments such as three segments or four segments are generally used in commercial applications. However, in an application where both PF, THDi and input current harmonic components have high requirements and a wide input voltage range, the efficiency performance of a small number of stages of segment-type LED driving circuits is often poor. Therefore, a lossy input current waveform compensation unit can be added on the basis of a sectional LED drive circuit, the relationship among PF, THDi, input current harmonic components and efficiency is balanced by introducing proper loss, and the problem of optimal efficiency meeting various electrical indexes can be solved by adopting an optimization method. Furthermore, the introduction of the lossy input current waveform compensation unit can also improve the problem of deterioration of various electrical indexes of the segmented LED driving circuit in a VLC (visible light communication) mode.

Disclosure of Invention

Although can satisfy PF, THDi and the high requirement of input current harmonic component but inefficiency and the not enough that electric indexes such as PF, THDi, input current harmonic component worsen under VLC mode for overcoming current few segment number's sectional type LED drive circuit under lighting mode, the utility model provides a contain the sectional type LED drive circuit who decreases input current waveform compensation unit, the sectional type LED drive circuit of purpose in improving few segment number efficiency performance under lighting mode and alleviating its deterioration degree of electric indexes such as PF, THDi, input current harmonic component under VLC mode.

The utility model provides a technical scheme that its technical problem adopted is:

a segmented LED driving circuit with a loss input current waveform compensation unit belongs to a multi-current source type and comprises a rectifying circuit, a controlled current source 1 to a controlled current source N + X, a controller and a loss compensation unit a, wherein the rectifying circuit comprises a capacitor Ci1, a capacitor Ci2 and diodes D1 to D4, the controlled current source K is provided with a port sK +, a port sK-, a port fK and a port eK, the value range of K is 1 to N + X, N and X are integers larger than 0, the controller is provided with ports e1 to eN + X, a port ea, a port f and a port fa, and the loss compensation unit a is provided with a port a +, a port a-, a port ea and a port fa;

one end of a single-phase alternating current power source vac is connected with one end of a capacitor Ci1, an anode of a diode D1 and a cathode of a diode D3, a cathode of a diode D1 is connected with a cathode of a diode D2, one end of a capacitor Ci2, a port a + of a loss compensation unit a and an anode of an LED string G1, a cathode of an LED string G1 is connected with an anode of an LED string G2, a port s1+ of a controlled current source 1, a port s 1-of the controlled current source 1 is connected with a port a-of the loss compensation unit a, the other end of a capacitor Ci2, an anode of a diode D4 and an anode of a diode D3, a cathode of a diode D4 is connected with an anode of a diode D2, the other end of a capacitor 1 and the other end of the single-phase alternating current power source vac, a port e1 of the controlled current source 1 is connected with a port e1 of the controller, a port f1 of the controlled current source, analogizing in sequence, the anode of the LED string GN + X is connected with the cathode of the LED string GN + X-1, the cathode of the LED string GN + X is connected with a port sN + X + of a controlled current source N + X, a port sN + X-of the controlled current source N + X is connected with a port a-of a loss compensation unit a, a port eN + X of the controlled current source N + X is connected with a port eN + X of a controller, a port fN + X of the controlled current source N + X is connected with a port f of the controller, a port ea of the controller is connected with a port ea of the loss compensation unit a, and a port fa of the controller is connected with a port fa of the loss compensation unit a;

the port ea and the port eK of the controller respectively control the on-off of a loss compensation unit a and a controlled current source K, the value range of K is 1 to N + X, N and X are integers which are larger than 0, when the loss compensation unit a is conducted, the size of the current ia flowing into the port a + of the loss compensation unit a is determined by the port fa of the controller, and when the controlled current source K is conducted, the size of the current iK flowing into the port sK + of the controlled current source K is determined by the port f of the controller;

the input current iac of the segmented LED driving circuit comprising the loss input current waveform compensation unit satisfies formula (1),

in the illumination mode, a current ia flowing into a port a + of the lossy compensation unit a and a current iK flowing into a port sK + of the controlled current source K satisfy equations (2) and (3), respectively,

in the VLC mode, the current ia flowing into the port a + of the lossy compensation unit a and the current iK flowing into the port sK + of the controlled current source K satisfy equation (4) and equation (5), respectively,

in the formula, the function fi (t) is any input current envelope function (e.g. sine function) satisfying the requirements of PF, THDi, input current harmonic component, etc., the function fc (t) is an LED current function (e.g. zero function) corresponding to VLC signal "0", the voltages V01 and V02 are a lower limit voltage and an upper limit voltage corresponding to the absolute value | vac | of the single-phase ac power voltage when the lossy compensation unit a is turned on in the lighting mode, the voltage VK is the forward conduction voltage drop of the LED string GK, and fc (t) 0 ≦ fc, V01< V02 ≦ V1.

Further, the controller comprises a DSP chip and a DAC chip, wherein the DSP chip adopts TMS320F28027, and the DAC chip adopts TLV 5627.

A segmented LED driving circuit with a loss input current waveform compensation unit belongs to a single current source type and comprises a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a loss compensation unit a, wherein the rectifying circuit comprises a capacitor Ci1, diodes D1 to D4 and a capacitor Ci2, the impedance compensation unit K is provided with a port aK, a port bK, a port eK and a port dK, the value range of the K is 1 to N + X, N and X are integers larger than 0, the controlled current source is provided with a port s +, a port s-, a port D and a port f, the controller is provided with a port e1 to eN + X, a port ea, a port f and a port fa, and the loss compensation unit a is provided with a port a +, a port ea and a port fa;

one end of a single-phase alternating current power supply vac is connected with one end of a capacitor Ci1, aN anode of a diode D1 and a cathode of a diode D3, a cathode of a diode D1 is connected with a cathode of a diode D2, one end of a capacitor Ci2, a port a + of a lossy compensation unit a, a port aN + X of aN impedance compensation unit N + X to a port a1 of the impedance compensation unit 1, a port bN + X of the impedance compensation unit N + X is connected with aN anode of aN LED string GN + X, a port dN + X of the impedance compensation unit N + X is connected with a port D of a controlled current source, a port eN + X of the impedance compensation unit N + X is connected with a port eN + X of a controller, and so on, a port b1 of the impedance compensation unit 1 is connected with a cathode of aN LED string G2 and aN anode of the LED string G1, a port D1 of the impedance compensation unit 1 is connected with a port D of the controlled current source, and a port 1 of the impedance compensation unit 1 is connected with a port 36e 1 of the controller, the cathode of the LED string G1 is connected with a port s + of a controlled current source, the port f of the controlled current source is connected with the port f of a controller, the port fa of the controller is connected with the port fa of a loss compensation unit a, the port ea of the controller is connected with the port ea of the loss compensation unit a, the port s-of the controlled current source is simultaneously connected with the port a-of the loss compensation unit a, the other end of a capacitor Ci2, the anode of a diode D4 and the anode of a diode D3, and the cathode of the diode D4 is simultaneously connected with the anode of a diode D2, the other end of a capacitor Ci1 and the other end of a single-phase power supply alternating current vac;

the port ea and the port eK of the controller respectively control the on-off of the lossy compensation unit a and the impedance compensation unit K, the magnitude of the current ia flowing into the port a + of the lossy compensation unit a when the lossy compensation unit a is conducted is determined by the port fa of the controller, the magnitude of the current iK flowing out of the port bK of the impedance compensation unit K when the impedance compensation unit K is conducted is determined by the port f of the controller, the magnitude of the equivalent impedance of the impedance compensation unit K when the impedance compensation unit K is conducted is determined by the port d of the controlled current source, the change of the equivalent impedance of the impedance compensation unit K when the impedance compensation unit K is conducted can improve the linearity of the controlled current source, the value range of K is 1 to N + X, N and X are integers larger than 0, and the currents iac, ia and iK also satisfy the expressions (1) to (5).

In the two segmented LED driving circuits with the loss input current waveform compensation unit, according to a first preferred embodiment of the loss compensation unit a, the loss compensation unit a includes a resistor Ra1_1, a resistor Ra2_1, an NPN-type BJT Qa1_1 and an NPN-type BJT Qa2_1, a port a + of the loss compensation unit a is connected to one end of the resistor Ra1_1, the other end of the resistor Ra1_1 is connected to a collector of the NPN-type BJT Qa1_1, a base of the NPN-type BJT Qa1_1 is connected to one end of the resistor Ra2_1 and the collector of the NPN-type BJT Qa2_1, the other end of the resistor Ra2_1 is connected to a port fa of the loss compensation unit a, a base of the NPN-type BJT Qa2_1 is connected to a port ea of the loss compensation unit a, an emitter of the NPN-type BJT Qa1_1 and an emitter of the BJT Qa2_1 are connected to the loss compensation unit a-a port, the resistor Ra1_1 is used for limiting the magnitude of the current ia, and the resistor Ra2_1 is used for adjusting the magnitude of the current ia.

In the above two segmented LED driving circuits having the loss input current waveform compensation unit, in a second preferred embodiment of the loss compensation unit a, the loss compensation unit a includes a resistor Ra1_2, a resistor Ra2_2, a resistor Ra3_2, an NPN BJT Qa1_2, an NPN BJT Qa2_2, and an NPN BJT Qa3_2, a port a + of the loss compensation unit a is connected to one end of the resistor Ra1_2, the other end of the resistor Ra1_2 is connected to a collector of the NPN BJT Qa3_2, a base of the NPN BJT Qa3_2 is connected to both one end of the resistor Ra3_2 and the collector of the NPN BJT Qa2_2, an emitter of the NPN BJT Qa3_2 is connected to a collector of the NPN BJT Qa 38 _2, a base of the NPN BJT Qa1_2 is connected to one end of the resistor Ra2_2, and the other end of the resistor Ra3_2 is connected to the other end of the BJT. The base of the NPN BJT transistor Qa2_2 is connected to the port ea of the lossy compensation unit a, the emitter of the NPN BJT transistor Qa1_2 and the emitter of the NPN BJT transistor Qa2_2 are both connected to the port a-of the lossy compensation unit a, the resistor Ra1_2 functions to limit the magnitude of the current ia, and the resistor Ra2_2 and the resistor Ra3_2 function to regulate the magnitude of the current ia. The second preferred version of the lossy compensation unit a has a better linearity than the first preferred version of the lossy compensation unit a.

For the two segmented LED driving circuits with the loss input current waveform compensation unit, according to a third preferred embodiment of the loss compensation unit a, the loss compensation unit a includes a resistor Ra1_3, a resistor Ra2_3, a resistor Ra3_3, an N-channel MOS transistor Ma1_3 and an N-channel MOS transistor Ma2_3, a port a + of the loss compensation unit a is connected to one end of a resistor Ra1_3, the other end of the resistor Ra1_3 is connected to a drain of the N-channel MOS transistor Ma1_3, a gate of the N-channel MOS transistor Ma1_3 is simultaneously connected to one end of the resistor Ra2_3 and a port fa of the loss compensation unit a, a source of the N-channel MOS transistor Ma1_3 is simultaneously connected to the other end of the resistor Ra2_3 and a drain of the N-channel MOS transistor Ma2_3, a gate of the N-channel MOS transistor Ma2_3 is simultaneously connected to one end of a resistor Ra3_3 and a source of the loss input current waveform compensation unit, and a source of the N-channel MOS transistor Ma 3985 is simultaneously connected to a port Ra 3638 Port a-connected. The third preferred version of the lossy compensation unit a has a better rapidity than the first and second preferred versions of the lossy compensation unit a.

A segmented LED driving circuit with a loss input current waveform compensation unit also belongs to a single current source type, and comprises a rectification circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a loss compensation unit b, wherein the rectification circuit comprises a capacitor Ci1, diodes D1 to D4 and a capacitor Ci2, the impedance compensation unit K is provided with a port aK, a port bK, a port eK and a port dK, the value range of the K is 1 to N + X, N and X are integers larger than 0, the controlled current source is provided with a port s +, a port s-, a port D and a port f, the controller is provided with a port e1 to eN + X, a port eb and a port f, and the loss compensation unit b is provided with a port b +, a port b-, a port eb and a port db;

one end of a single-phase alternating current power supply vac is connected with one end of a capacitor Ci1, aN anode of a diode D1 and a cathode of a diode D3, a cathode of a diode D1 is connected with a cathode of a diode D2, one end of a capacitor Ci2, a port b + of a lossy compensation unit b, a port aN + X of aN impedance compensation unit N + X to a port a1 of the impedance compensation unit 1, a port bN + X of the impedance compensation unit N + X is connected with aN anode of aN LED string GN + X, a port dN + X of the impedance compensation unit N + X is connected with a port D of a controlled current source, a port eN + X of the impedance compensation unit N + X is connected with a port eN + X of a controller, and so on, a port b1 of the impedance compensation unit 1 is connected with a cathode of the LED string G2 and aN anode of the LED string G1, a port D1 of the impedance compensation unit 1 is connected with a port D of the controlled current source, and a port e1 of the impedance compensation unit 1 is connected with a port 1, the cathode of the LED string G1 is connected with a port b-of a lossy compensation unit b and a port s + of a controlled current source, a port D of the controlled current source is also connected with a port db of the lossy compensation unit b, a port f of the controlled current source is connected with a port f of a controller, a port eb of the controller is connected with a port eb of the lossy compensation unit b, a port s-of the controlled current source is connected with the other end of a capacitor Ci2, the anode of a diode D4 and the anode of a diode D3, and the cathode of the diode D4 is connected with the anode of a diode D2, the other end of a capacitor Ci1 and the other end of a single-phase alternating current power supply vac;

the port eb and the port eK of the controller respectively control the on-off of the lossy compensation unit b and the impedance compensation unit K, the magnitude of the current ib flowing out of the port b-of the lossy compensation unit b or the magnitude of the current iK flowing out of the port bK of the impedance compensation unit K when the lossy compensation unit b or the impedance compensation unit K is conducted are both determined by the port f of the controller, the magnitude of the equivalent impedance of the lossy compensation unit b or the impedance compensation unit K is determined by the port d of the controlled current source when the lossy compensation unit b or the impedance compensation unit K is conducted, the change of the equivalent impedance of the lossy compensation unit b or the impedance compensation unit K can improve the linearity of the controlled current source when the lossy compensation unit b or the impedance compensation unit K is conducted, the value range of K is 1 to N + X, and N and X are both integers larger than 0,

the input current iac of the segmented LED driving circuit comprising the loss input current waveform compensation unit satisfies formula (6),

in the illumination mode, a current ib flowing out of a port b-of the lossy compensation unit b and a current iK flowing out of a port bK of the impedance compensation unit K satisfy equation (7) and equation (8), respectively,

in the VLC mode, a current ib flowing out of a port b-of the lossy compensation unit b and a current iK flowing out of a port bK of the impedance compensation unit K satisfy equations (9) and (10), respectively,

in the formula, the function fi (t) is any input current envelope function (for example, a sine function) meeting the requirements of PF, THDi, input current harmonic components and the like, the voltages V01 and V02 are respectively a lower limit voltage and an upper limit voltage corresponding to the absolute value | vac | of the single-phase alternating-current power supply voltage when the lossy compensation unit b is turned on in the lighting mode, the voltage VK is a forward conduction voltage drop of the LED string GK, and V01 is greater than or equal to 0 and V02 is greater than or equal to V1.

In the aforementioned segmented LED driving circuit having the loss input current waveform compensation unit, according to a first preferred embodiment of the loss compensation unit b, the loss compensation unit b includes a PNP BJT Qb1_1, an NPN BJT Qb2_1, an NPN BJT Qb3_1, a resistor Rb1_1, a resistor Rb2_1, a resistor Rb3_1, a resistor Rb4_1, and a resistor Rb5_1, a port b + of the loss compensation unit b is connected to an emitter of the PNP BJT Qb1_1, a collector of the PNP BJT Qb1_1 is connected to one end of the resistor Rb1_1, the other end of the resistor Rb1_1 is connected to a port b-of the loss compensation unit b, a base of the PNP BJT Qb1_1 is connected to one end of the resistor Rb2_1, the other end of the resistor Rb2_1 is connected to a collector of the NPN BJT Qb2_1, and a base of the NPN BJT 2_1 and an end 68692 of the resistor Rb 638 _ Rb 631, the other end of the resistor Rb3_1 is connected with a port eb of the lossy compensation unit b, the other end of the resistor Rb4_1 is connected with a collector of an NPN type BJT transistor Qb3_1, a base of the NPN type BJT transistor Qb3_1 is connected with one end of a resistor Rb5_1, the other end of the resistor Rb5_1 is connected with a port db of the lossy compensation unit b, and an emitter of the NPN type BJT transistor Qb2_1 and an emitter of the NPN type BJT transistor Qb3_1 are both connected with a port s-of a controlled current source. The resistor Rb1_1, the resistor Rb2_1 and the resistor Rb4_1 are all current-limiting resistors, and the resistor Rb5_1 plays a role in adjusting the equivalent impedance from the port b + to the port b-of the lossy compensation unit b.

In the aforementioned segmented LED driving circuit having the loss input current waveform compensation unit, according to a second preferred embodiment of the loss compensation unit b, the loss compensation unit b includes a PNP BJT Qb1_2, an NPN BJT Qb2_2, a PNP BJT Qb3_2, a PNP BJT Qb4_2, a resistor Rb1_2, a resistor Rb2_2, a resistor Rb3_2, a resistor Rb4_2, and a resistor Rb5_2, a port b + of the loss compensation unit b is connected to an emitter of the PNP BJT Qb1_2, a collector of the PNP BJT Qb1_2 is connected to an emitter of the PNP BJT Qb4_2, a collector of the PNP BJT Qb4_2 is connected to one end of the resistor Rb1_2, the other end of the resistor Rb1_2 is connected to the port b-BJT of the loss compensation unit b, a base of the PNP BJT Qb 638 _2 is connected to one end of the resistor Rb2, and the other end of the PNP BJT 632 Rb 632 is connected to the resistor Rb 638 Rb 632, the base of the NPN BJT transistor Qb2_2 is connected with one end of a resistor Rb3_2, the other end of the resistor Rb3_2 is connected with a port eb of the lossy compensation unit b, the base of the PNP BJT transistor Qb4_2 is connected with one end of a resistor Rb4_2, the other end of the resistor Rb4_2 is connected with the emitter of the PNP BJT transistor Qb3_2, the base of the PNP BJT transistor Qb3_2 is connected with one end of a resistor Rb5_2, the other end of the resistor Rb5_2 is connected with a port db of the lossy compensation unit b, and the emitter of the NPN BJT transistor Qb2_2 and the collector of the PNP BJT transistor Qb3_2 are both connected with a port s-of a controlled current source. The resistor Rb1_2, the resistor Rb2_2 and the resistor Rb4_2 are all current-limiting resistors, and the resistor Rb5_2 plays a role in adjusting the equivalent impedance from the port b + to the port b-of the lossy compensation unit b. The second preferred version of the lossy compensation unit b has a wider equivalent impedance adjustment range than the first preferred version of the lossy compensation unit b.

The technical conception of the utility model is as follows: by implanting the lossy compensation unit, the performance of high PF, low THDi and low input current harmonic components can be obtained by a small number of segments of segmented LED driving circuits in both lighting and VLC modes; and an optimization method based on a PSO algorithm containing constraint conditions is combined, so that the efficiency of the sectional LED driving circuit with few segments can be maximized in an illumination mode.

The beneficial effects of the utility model are that: the sectional LED driving circuit with the loss input current waveform compensation unit has the characteristics of high PF, low THDi and low input current harmonic component in a wide input voltage range; the applicable optimization method can simultaneously realize high PF, low THDi and low input current harmonic component and efficiency maximization of the segmented LED driving circuit containing the loss input current waveform compensation unit under the illumination mode, namely, the segmented LED driving circuit is operated in the optimal working state.

Drawings

Fig. 1 is a circuit diagram of embodiment 1 of the present invention.

Fig. 2 is a circuit diagram of embodiment 2 of the present invention.

Fig. 3 is a circuit diagram of embodiment 3 of the present invention.

Fig. 4 is a schematic diagram of the input voltage and current waveforms of the present invention in the illumination mode.

Fig. 5 is a schematic diagram of the input voltage and current waveforms in VLC mode.

Fig. 6 is a first preferred embodiment of a lossy compensation unit a suitable for use in examples 1 and 2 of the present invention.

Fig. 7 is a second preferred embodiment of a lossy compensation unit a suitable for use in examples 1 and 2 of the present invention.

Fig. 8 is a third preferred version of lossy compensation unit a suitable for use in

embodiments

1 and 2 of the present invention.

Fig. 9 is a first preferred embodiment of a lossy compensation unit b suitable for use in embodiment 3 of the present invention.

Fig. 10 is a second preferred embodiment of a lossy compensation unit b suitable for use in embodiment 3 of the present invention.

Fig. 11 is a schematic voltage distribution diagram suitable for the optimization method of the present invention.

Fig. 12 is a simulated waveform diagram of embodiment 1 of the present invention in the lighting mode.

FIG. 13 is a waveform diagram of a simulation of a prior art segmented LED driver circuit in an illumination mode.

Fig. 14 is an experimental waveform diagram of embodiment 2 of the present invention in the VLC mode.

Fig. 15 is an experimental waveform diagram of a conventional segmented LED driving circuit in VLC mode.

Fig. 16 is an experimental waveform diagram of the embodiment 3 of the present invention in the illumination mode after combining with the applicable optimization method.

FIG. 17 is a waveform diagram of an experiment in an illumination mode after a prior segmented LED driving circuit is combined with a prior optimization method.

Detailed Description

The present invention will be further described with reference to the accompanying drawings.

Example 1

Referring to fig. 1 and 4 to 8, a segmented LED driving circuit including a lossy input current waveform compensation unit includes a rectifying circuit, a controlled current source 1 to a controlled current source N + X, a controller, and a lossy compensation unit a, the rectifying circuit includes a capacitor Ci1, a capacitor Ci2, and diodes D1 to D4, the controlled current source K has a port sK +, a port sK-, a port fK, and a port eK, a value of K ranges from 1 to N + X, N and X are integers greater than 0, the controller has ports e1 to eN + X, a port ea, a port f, and a port fa, and the lossy compensation unit a has a port a +, a port a-, a port ea, and a port fa;

the input current iac of the segmented LED driving circuit including the lossy input current waveform compensation unit satisfies equation (1), the current ia flowing into the port a + of the lossy compensation unit a and the current iK flowing into the port sK + of the controlled current source K in the lighting mode satisfy equations (2) and (3), respectively, and the current ia flowing into the port a + of the lossy compensation unit a and the current iK flowing into the port sK + of the controlled current source K in the VLC mode satisfy equations (4) and (5), respectively.

Referring to fig. 6, the lossy compensation unit a adopts a first preferred scheme, that is, the lossy compensation unit a comprises a resistor Ra1_1 and a resistor Ra2_1, the device comprises an NPN BJT transistor Qa1_1 and an NPN BJT transistor Qa2_1, wherein a port a + of a lossy compensation unit a is connected with one end of a resistor Ra1_1, the other end of the resistor Ra1_1 is connected with a collector of the NPN BJT transistor Qa1_1, a base of the NPN BJT transistor Qa1_1 is connected with one end of the resistor Ra2_1 and the collector of the NPN BJT transistor Qa2_1, the other end of the resistor Ra2_1 is connected with a port fa of the lossy compensation unit a, a base of the NPN BJT transistor Qa2_1 is connected with a port ea of the lossy compensation unit a, an emitter of the NPN BJT transistor Qa1_1 and an emitter of the NPN BJT transistor Qa2_1 are both connected with the port a-a of the lossy compensation unit a, the resistor Ra1_1 is used for limiting the magnitude of current ia, and the resistor Ra2_1 is used for adjusting the magnitude of the.

Referring to fig. 7, the lossy compensation unit a adopts a second preferred scheme, that is, the lossy compensation unit a includes a resistor Ra1_2, a resistor Ra2_2, a resistor Ra3_2, an NPN BJT Qa1_2, an NPN BJT Qa2_2, and an NPN BJT Qa3_2, a port a + of the lossy compensation unit a is connected to one end of the resistor Ra1_2, the other end of the resistor Ra1_2 is connected to a collector of the NPN BJT Qa3_2, a base of the NPN BJT Qa3_2 is connected to both one end of the resistor Ra3_2 and the collector of the NPN BJT Qa2_2, an emitter of the NPN BJT Qa3_2 is connected to a collector of the NPN BJT Qa1_2, a1_2 has a base connected to one end of the resistor Ra2_2, and another end of the resistor Ra3_2 is connected to the base of the BJT 39a, and the other end of the resistor Ra2_2, and the base of the lossy compensation unit Ra2 a, the emitter of the NPN-type BJT Qa1_2 and the emitter of the NPN-type BJT Qa2_2 are both connected to the port a-of the lossy compensation unit a, the resistor Ra1_2 functions to limit the magnitude of the current ia, and the resistor Ra2_2 and the resistor Ra3_2 function to participate in adjusting the magnitude of the current ia. The second preferred version of the lossy compensation unit a has a better linearity than the first preferred version of the lossy compensation unit a.

Referring to fig. 8, the lossy compensation unit a adopts a third preferred scheme, that is, the lossy compensation unit a comprises a resistor Ra1_3 and a resistor Ra2_3, a resistor Ra3_3, an N-channel MOS tube Ma1_3 and an N-channel MOS tube Ma2_3, wherein a port a + of the loss compensation unit a is connected with one end of the resistor Ra1_3, the other end of the resistor Ra1_3 is connected with a drain of the N-channel MOS tube Ma1_3, a gate of the N-channel MOS tube Ma1_3 is simultaneously connected with one end of the resistor Ra2_3 and a port fa of the loss compensation unit a, a source of the N-channel MOS tube Ma1_3 is simultaneously connected with the other end of the resistor Ra2_3 and a drain of the N-channel MOS tube Ma2_3, a gate of the N-channel MOS tube Ma2_3 is simultaneously connected with one end of the resistor Ra3_3 and a port ea of the loss compensation unit a, and a source of the N-channel MOS tube Ma2_3 is simultaneously connected with the other end of the resistor Ra3_3 and a port a-a port a. The third preferred version of the lossy compensation unit a has a better rapidity than the first and second preferred versions of the lossy compensation unit a.

The second preferred scheme of the lossy compensation unit a and the input current compensation scheme of "V01 ═ 0 and V02 ═ V1" in the lighting mode are adopted, Vac ═ 200V, N ═ 3, X ═ 1 and fi (t) are taken as sine functions, and the embodiment 1 of the present invention and the existing segmented LED driving circuit are compared in simulation. Fig. 12 is a simulated waveform diagram of embodiment 1 of the present invention in the lighting mode. FIG. 13 is a waveform diagram of a simulation of a prior art segmented LED driver circuit in an illumination mode. As can be seen from a comparison of fig. 12 and 13, example 1 has a higher PF, a lower THDi, and a lower harmonic component of the input current.

Example 2

Referring to fig. 2 and 4 to 8, a segmented LED driving circuit including a lossy input current waveform compensation unit includes a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller, and a lossy compensation unit a, where the rectifying circuit includes a capacitor Ci1, diodes D1 to D4, and a capacitor Ci2, the impedance compensation unit K has a port aK, a port bK, a port eK, and a port dK, a value range of K is 1 to N + X, N and X are integers greater than 0, the controlled current source has a port s +, a port s-, a port D, and a port f, the controller has a port e1 to eN + X, a port ea, a port f, and a port fa, and the lossy compensation unit a has a port a +, a port ea-, and a port fa;

The other structure of the embodiment 2 is the same as that of the embodiment 1, and the working process is also similar to that of the embodiment 1.

The first preferred scheme of the lossy compensation unit a and the input current compensation scheme of "fc (t) ═ 0" in the VLC mode are adopted, Vac 220V, N ═ 3, X ═ 1, and fi (t) are taken as sine functions, and the embodiment 2 of the present invention and the existing segmented LED driving circuit are compared through experiments. Fig. 14 is an experimental waveform diagram of embodiment 2 of the present invention in the VLC mode. Fig. 15 is an experimental waveform diagram of a conventional segmented LED driving circuit in VLC mode. As can be seen from comparing fig. 14 and 15, example 2 has a higher PF, a lower THDi, and a lower harmonic component of the input current, and the corresponding experimental data shows: the THDi of example 2 was 8.7%, while the THDi of the existing segmented LED driving circuit was 28.4%; the efficiency of example 2 is 76.6% compared to 85.4% for the existing segmented LED driving circuit.

Example 3

Referring to fig. 3, 4, 5, 9 and 10, a segmented LED driving circuit including a loss input current waveform compensation unit includes a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a loss compensation unit b, the rectifying circuit includes a capacitor Ci1, diodes D1 to D4 and a capacitor Ci2, the impedance compensation unit K has a port aK, a port bK, a port eK and a port dK, K has a value range of 1 to N + X, N and X are integers greater than 0, the controlled current source has a port s +, a port s-, a port D and a port f, the controller has a port e1 to eN + X, a port eb and a port f, and the loss compensation unit b has a port b +, a port b-, a port eb and a port db;

the port eb and the port eK of the controller respectively control the on-off of the lossy compensation unit b and the impedance compensation unit K, the magnitude of the current ib flowing out of the port b + of the lossy compensation unit b or the magnitude of the current iK flowing out of the port bK of the impedance compensation unit K when the lossy compensation unit b or the impedance compensation unit K is conducted are both determined by the port f of the controller, the magnitude of the equivalent impedance of the lossy compensation unit b or the impedance compensation unit K is determined by the port d of the controlled current source when the lossy compensation unit b or the impedance compensation unit K is conducted, the change of the equivalent impedance of the lossy compensation unit b or the impedance compensation unit K can improve the linearity of the controlled current source when the lossy compensation unit b or the impedance compensation unit K is conducted, the value range of K is 1 to N + X, and N and X are both integers larger than 0,

the input current iac of the segmented LED driving circuit comprising the loss input current waveform compensation unit satisfies the formula (6). In the illumination mode, a current ib flowing out of a port b-of the lossy compensation unit b and a current iK flowing out of a port bK of the impedance compensation unit K satisfy equations (7) and (8), respectively; in the VLC mode, the current ib flowing out of the port b-of the lossy compensation unit b and the current iK flowing out of the port bK of the impedance compensation unit K satisfy equation (9) and equation (10), respectively.

Referring to fig. 9, in a first preferred embodiment of the lossy compensation unit b, the lossy compensation unit b includes a PNP BJT transistor Qb1_1, an NPN BJT transistor Qb2_1, an NPN BJT transistor Qb3_1, a resistor Rb1_1, a resistor Rb2_1, a resistor Rb3_1, a resistor Rb4_1 and a resistor Rb5_1, a port b + of the lossy compensation unit b is connected to an emitter of the PNP BJT transistor Qb1_1, a collector of the PNP BJT transistor Qb1_1 is connected to one end of the resistor Rb1_1, the other end of the resistor Rb1_1 is connected to a port b-of the lossy compensation unit b, a base of the PNP BJT transistor Qb1_1 is connected to one end of the resistor Rb2_1, the other end of the resistor Rb2_1 is connected to a collector of the NPN BJT transistor Qb2_1, a base of the BJT transistor Qb2_1 is connected to one end of the resistor Rb3, and the other end of the resistor Rb4 b4, and the other end of the lossy compensation unit Rb3_1, the other end of the resistor Rb4_1 is connected with the collector of the NPN BJT tube Qb3_1, the base of the NPN BJT tube Qb3_1 is connected with one end of the resistor Rb5_1, the other end of the resistor Rb5_1 is connected with a port db of the lossy compensation unit b, and the emitter of the NPN BJT tube Qb2_1 and the emitter of the NPN BJT tube Qb3_1 are both connected with a port s-of the controlled current source. The resistor Rb1_1, the resistor Rb2_1 and the resistor Rb4_1 are all current-limiting resistors, and the resistor Rb5_1 plays a role in adjusting the equivalent impedance from the port b + to the port b-of the lossy compensation unit b.

Referring to fig. 10, in a second preferred embodiment of the lossy compensation unit b, the lossy compensation unit b includes a PNP BJT transistor Qb1_2, an NPN BJT transistor Qb2_2, a PNP BJT transistor Qb3_2, a PNP BJT transistor Qb4_2, a resistor Rb1_2, a resistor Rb2_2, a resistor Rb3_2, a resistor Rb4_2 and a resistor Rb5_2, a port b + of the lossy compensation unit b is connected to an emitter of the PNP BJT transistor Qb1_2, a collector of the PNP BJT transistor Qb1_2 is connected to an emitter of the PNP BJT transistor Qb4_2, a collector of the PNP BJT transistor Qb4_2 is connected to one end of the resistor Rb1_2, the other end of the resistor Rb1_2 is connected to a port b 462 of the lossy compensation unit b, a base of the PNP BJT transistor Qb1_2 is connected to one end of the resistor Rb2_2, and a collector of the PNP BJT transistor Rb 462 is connected to one end of the resistor Rb 4642 b2 b, the other end of the resistor Rb3_2 is connected with a port eb of the loss compensation unit b, the base of the PNP type BJT transistor Qb4_2 is connected with one end of the resistor Rb4_2, the other end of the resistor Rb4_2 is connected with the emitter of the PNP type BJT transistor Qb3_2, the base of the PNP type BJT transistor Qb3_2 is connected with one end of the resistor Rb5_2, the other end of the resistor Rb5_2 is connected with a port db of the loss compensation unit b, and the emitter of the NPN type BJT transistor Qb2_2 and the collector of the PNP type BJT transistor Qb3_2 are both connected with a port s-of a controlled current source. The resistor Rb1_2, the resistor Rb2_2 and the resistor Rb4_2 are all current-limiting resistors, and the resistor Rb5_2 plays a role in adjusting the equivalent impedance from the port b + to the port b-of the lossy compensation unit b. The second preferred version of the lossy compensation unit b has a wider equivalent impedance adjustment range than the first preferred version of the lossy compensation unit b.

The other structure of the embodiment 3 is the same as that of the embodiment 2, and the working process is also similar to that of the embodiment 2.

Referring to fig. 11, embodiment 3 employs an optimization method of the parameters V01, V02, V1 to VN + X in the illumination mode, which includes steps one to four.

The method comprises the following steps: assume that the lower limit of the effective value of the single-phase AC power supply voltage is Vacmin and the lower limit margin is Δ V1, and Δ V1>0, the forward conduction voltage drop of the individual LEDs constituting the LED strings G1 to GN + X is VLED, determined by equation (11)

The value of (a) is,

step two: suppose that the upper limit of the effective value of the single-phase AC power voltage is Vacmax and the upper limit margin is DeltaV 2, and DeltaV 2>0, if equation (12) is satisfied, the method of uniform distribution, that is, the method of determination using equation (13)

The value of (A), M ranges from 1 to X,

step three: if equation (14) is satisfied, the constrained PSO algorithm (i.e., particle swarm optimization) is used to find V01, V02 and V1 to V01 with efficiency as priority

The optimal solution of (1) is that the constraint condition (a) is composed of a formula (15) and a formula (16), the value range of Y is 1 to N-1, the constraint condition (b) is composed of a formula (17) to a formula (19), PF _ required is a PF index standard value, THDi _ required is a THDi index standard value, Iac (N) is an effective value of the nth harmonic of the input current,

0≤V01＜V02≤V1(15)

PF＞PF_required (17)

THDi＜THDi_required (18)

iac (n) < IEC 61000-3-2 standard value (19)

Step four: v1 to V obtained according to the steps one to three

Determines the values of V2 to VN + X.

Further, the third step of the optimization method comprises the first to seventh substeps, assuming that the nominal value of the effective value of the single-phase alternating-current power supply voltage is Vacrating,

the first substep: generating n groups of V01, V02 and V1 to

N is an integer greater than 1, setting the total number of iterations to k, the current number of iterations to m, and the iteration error to epsilon, k being an integer greater than 1, assigning m to 0, assigning epsilon to a specific positive number epsilon 1, defining j-th groups V01, V02, and V1 through to

Are V01_ j (0), V02_ j (0), and V1_ j (0) to

The jth groups V01, V02 and V1 to

Have current values of V01_ j (m), V02_ j (m), and V1_ j (m) to

The jth groups V01, V02 and V1 to

Are V01_ j (m +1), V02_ j (m +1) and V1_ j (m +1) to

The jth group of local optimization solutions are V01_ jpbest, V02_ jpbest and V1_ jpbest to

The jth group local maximum efficiency is η _ jpbest, and the 1 st to nth groups global optimization solutions are V01_ gbest, V02_ gbest and V1_ gbest to

The 1 st to nth sets of global maximum efficiencies are η _ gbest, j ranges from 1 to n, assigned values of η _ jpbest 0 and η _ gbest 0,

and a second substep: sequentially substituting n groups of V01, V02 and V1 to

Calculating the average efficiency under three working conditions of Vacmin, Vacrating and Vacmax,

if groups j, V01, V02 and V1 to

Current values of V01_ j (m), V02_ j (m), and V1_ j (m) to

So that the constraint conditions (b) are all satisfied, the average efficiency is calculated

If groups j, V01, V02 and V1 to

Current values of V01_ j (m), V02_ j (m), and V1_ j (m) to

If the constraint conditions (b) can not be completely satisfied, the average efficiency is directly assigned

Is a particular negative number η 1,

and a third substep: sequentially updating n groups of local maximum efficiency and local optimization solutions,

if it is

And is

The local maximum efficiency and local optimization solutions, i.e., assignments, for the jth group are updated

V01 jpbest (V01_ j (m)), V02 jpbest (V02_ j (m)), V1 jpbest (V1 _ j (m)), and so on,

while terminating the process of finding the locally optimized solution in group j,

if it is

And is

The local maximum efficiency and the local optimization solution of the jth group are kept unchanged, while the process of finding the local optimization solution of the jth group is terminated,

if it is

And is

while continuing the process of finding the locally optimized solution of group j,

if it is

And is

The local maximum efficiency and local optimization solution of the jth group are kept unchanged, while continuing the process of finding the local optimization solution of the jth group,

and a fourth substep: sequentially updating n groups of V01, V02 and V1 to

Is determined by the subsequent value of (a),

suppose vj01 is the particle velocity of the jth group V01, vj02 is the particle velocity of the jth group V02, vj1 is the particle velocity of the jth group V1, and so on, vjN-1 is the jth group V01

In accordance with equations (20) to (23), vj01 and V01_ j (m +1), vj02 and V02_ j (m +1), vj1 and V1_ j (m +1) to vjN-1 and

until the constraint condition (a) is satisfied,

vj＝MIN(vj,vj_ulimit) (21)

vj＝MAX(vj,vj_dlimit) (22)

jpresent(m+1)＝jpresent(m)+vj (23)

wherein w is an inertia weight, rand () is a random function with a result between (0, 1), c1 and c2 are learning factors, MIN () is a minimum function, MAX () is a maximum function, vj ranges from vj01, vj02 and vj1 to vjN-1, vj _ ulimit ranges from vj01_ ulimit, vj02_ ulimit and vj1_ ulimit to vjN-1_ ulimit, vj vjN _ ulimit is an upper limit of vj vjN, sequentially analogizing, vjN-1_ ulimit is an upper limit of vjN-1, vj _ dlinit ranges from vj vjN _ dlinit, vj _ 72 _ dlinit is a lower limit of vj vjN _ dlinit, vj _ dlinit _ vjN, and vj _ dlinit _ vjN is a lower limit of vj vjN, and vj _ dlinit _ vjN, and so on, vj _ dlinit vjN, vj _ vjN is a lower limit of vj _ dlinit vjN, and so on vjN, vj _ dlinit is a lower limit of vj vjN, vj _ vjN, and so on 36, correspondingly, jpresent (m) has values ranging from V01_ j (m), V02_ j (m), and V1_ j (m).

The value range of jpbest is V01_ jpbest, V02_ jpbest and V1_ jpbest to

The value range of the gbest is from V01_ gbest, V02_ gbest and V1_ gbest to

And a fifth sub-step of updating the 1 st to nth sets of global maximum efficiency and global optimization solutions, taking η _ gbest as MAX (η _1 pbset.., η _ npbset), MAX () as a maximum function,

if η _ jpbest is MAX (η _1 pbset.., η _ npbset), a value V01_ gbest is assigned V01_ jpbest, V02_ gbest is assigned V02Jpbest, V1 gbest, V1 jpbest, and so on,

and a sixth substep: and (4) updating the current iteration number m to m +1, and repeating the substeps two to five until the current iteration number m is larger than the total iteration number k or the 1 st to n th groups of processes for searching the local optimal solution are all terminated.

And a seventh substep: determination of V01, V02 and V1 to

To get

By analogy in the following way,

v02 ═ MIN (V02_ gbest, V1), V01 ═ MIN (V01_ gbest, V02), MIN () is the minimum function.

Still further, in the first substep, the jth groups of V01, V02 and V1 to V1 are sequentially generated in reverse order

At an initial value of, i.e. first

To V1_ j (0), V02_ j (0), and V01_ j (0), the initial value generation strategy is to generate the initial value by applying a random function similar to rand () within the range defined by the constraint (a).

Further, the setting of the sub-steps four with respect to the jth group vj01_ ulimit to vjN-1_ ulimit and vj01_ dlimit to vjN-1_ dlimit is done in combination with the constraint (a).

The embodiment 3 of the present invention and the conventional segmented LED driving circuit are compared by taking Vacmin 190V, Vacmax, 250V, Vacrating, 220V, VLED, 3.08V, N, X1, fi (t) is a sine function, PF _ required 0.9, THDi _ required 5, IEC 61000-3-2Class C standard, n 50, k 50, w 1, and C1C 2, 0.5. Fig. 16 is an experimental waveform diagram in the Vac ═ 220V lighting mode after embodiment 3 of the present invention is combined with the optimization method of the present invention. Fig. 17 is an experimental waveform diagram of a conventional segmented LED driving circuit combined with a conventional optimization method (chinese utility model patent No.: ZL 201710928070.7) under Vac 220V lighting mode. The corresponding experimental data show that: the PF value, the THDi value and the input current harmonic component values of the embodiment 3 and the existing sectional type LED driving circuit meet the requirements; however, the efficiency of example 3 is 86.0%, while the efficiency of the conventional segmented LED driving circuit is 84.0%.

The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather by the claims and their equivalents.

Claims

1. A sectional type LED drive circuit containing a loss input current waveform compensation unit is characterized in that: the segmented LED driving circuit with the loss input current waveform compensation unit comprises a rectifying circuit, a controlled current source 1 to a controlled current source N + X, a controller and a loss compensation unit a, wherein the rectifying circuit comprises a capacitor Ci1, a capacitor Ci2 and diodes D1 to D4, the controlled current source K is provided with a port sK +, a port sK-, a port fK and a port eK, the value range of K is 1 to N + X, N and X are integers larger than 0, the controller is provided with ports e1 to eN + X, a port ea, a port f and a port fa, and the loss compensation unit a is provided with a port a +, a port a-, a port ea and a port fa;

in the formula, the function fi (t) is an arbitrary input current envelope function meeting the requirements of PF, THDi, input current harmonic components and the like, the function fc (t) is an LED current function corresponding to VLC signal "0", the voltages V01 and V02 are a lower limit voltage and an upper limit voltage corresponding to the absolute value | vac | of the single-phase ac power voltage when the lossy compensation unit a is turned on in the lighting mode, the voltage VK is a forward conduction voltage drop of the LED string GK, and fc (t <) | fi (t) | is greater than or equal to 0 and V01< V02 < V1 are greater than or equal to 0.

2. A sectional type LED drive circuit containing a loss input current waveform compensation unit is characterized in that: the segmented LED driving circuit with the loss input current waveform compensation unit comprises a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a loss compensation unit a, wherein the rectifying circuit comprises a capacitor Ci1, diodes D1 to D4 and a capacitor Ci2, the impedance compensation unit K is provided with a port aK, a port bK, a port eK and a port dK, the value range of K is 1 to N + X, N and X are integers larger than 0, the controlled current source is provided with a port s +, a port s-, a port D and a port f, the controller is provided with a port e1 to eN + X, a port ea, a port f and a port fa, and the loss compensation unit a is provided with a port a +, a port ea and a port fa;

the port ea and the port eK of the controller respectively control the on-off of the lossy compensation unit a and the impedance compensation unit K, the magnitude of the current ia flowing into the port a + of the lossy compensation unit a when the lossy compensation unit a is conducted is determined by the port fa of the controller, the magnitude of the current iK flowing out of the port bK of the impedance compensation unit K when the impedance compensation unit K is conducted is determined by the port f of the controller, the magnitude of the equivalent impedance of the impedance compensation unit K when the impedance compensation unit K is conducted is determined by the port d of the controlled current source, the change of the equivalent impedance of the impedance compensation unit K when the impedance compensation unit K is conducted can improve the linearity of the controlled current source, the value range of K is 1 to N + X, N and X are integers larger than 0, and the currents iac, ia and iK satisfy the expressions (1) to (5).

3. The segmented LED drive circuit with a loss input current waveform compensation unit according to claim 1 or 2, wherein: the lossy compensation unit a comprises a resistor Ra1_1, a resistor Ra2_1, an NPN BJT transistor Qa1_1 and an NPN BJT transistor Qa2_1, wherein a port a + of the lossy compensation unit a is connected with one end of the resistor Ra1_1, the other end of the resistor Ra1_1 is connected with a collector of the NPN BJT transistor Qa1_1, a base of the NPN BJT transistor Qa1_1 is connected with one end of the resistor Ra2_1 and a collector of the NPN BJT transistor Qa2_1, the other end of the resistor Ra2_1 is connected with a port fa of the lossy compensation unit a, a base of the NPN BJT transistor Qa2_1 is connected with a port ea of the lossy compensation unit a, and an emitter of the NPN BJT transistor Qa1_1 and an emitter of the NPN BJT transistor Qa2_1 are connected with the port a-a of the lossy compensation unit a.

4. The segmented LED drive circuit with a loss input current waveform compensation unit according to claim 1 or 2, wherein: the lossy compensation unit a comprises a resistor Ra1_2, a resistor Ra2_2, a resistor Ra3_2, an NPN BJT transistor Qa1_2, an NPN BJT transistor Qa2_2 and an NPN BJT transistor Qa3_2, the port a + of the lossy compensation unit a is connected with one end of a resistor Ra1_2, the other end of the resistor Ra1_2 is connected with the collector of an NPN-type BJT tube Qa3_2, the base of the NPN-type BJT tube Qa3_2 is connected with one end of a resistor Ra3_2 and the collector of an NPN-type BJT tube Qa2_2, the emitter of the NPN-type BJT tube Qa3_2 is connected with the collector of the NPN-type BJT tube Qa1_2, the base of the NPN-type BJT tube Qa1_2 is connected with one end of a resistor Ra2_2, the other end of the resistor Ra3_2 and the other end of the resistor Ra2_2 are both connected with the port fa of the lossy compensation unit a, the base of the NPN-type BJT tube Qa2_2 is connected with the port ea of the lossy compensation unit a, and the emitter of the NPN-type BJT tube Qa1_2 and the emitter of the lossy compensation unit a2 are both connected with the port.

5. The segmented LED drive circuit with a loss input current waveform compensation unit according to claim 1 or 2, wherein: the loss compensation unit a comprises a resistor Ra1_3, a resistor Ra2_3, a resistor Ra3_3, an N-channel MOS tube Ma1_3 and an N-channel MOS tube Ma2_3, wherein a port a + of the loss compensation unit a is connected with one end of the resistor Ra1_3, the other end of the resistor Ra1_3 is connected with a drain of the N-channel MOS tube Ma1_3, a gate of the N-channel MOS tube Ma1_3 is connected with one end of the resistor Ra2_3 and a port fa of the loss compensation unit a, a source of the N-channel MOS tube Ma1_3 is connected with the other end of the resistor Ra2_3 and a drain of the N-channel MOS tube Ma2_3, a gate of the N-channel MOS tube Ma2_3 is connected with one end of the resistor Ra3_3 and a port ea of the loss compensation unit a, and a source of the N-channel MOS tube Ma2_3 is connected with the other end of the resistor Ra3_3 and a-port of the loss compensation unit a.

6. A sectional type LED drive circuit containing a loss input current waveform compensation unit is characterized in that: the segmented LED driving circuit with the loss input current waveform compensation unit comprises a rectifying circuit, an impedance compensation unit 1 to an impedance compensation unit N + X, a controlled current source, a controller and a loss compensation unit b, wherein the rectifying circuit comprises a capacitor Ci1, diodes D1 to D4 and a capacitor Ci2, the impedance compensation unit K is provided with a port aK, a port bK, a port eK and a port dK, the value range of K is 1 to N + X, N and X are integers larger than 0, the controlled current source is provided with a port s +, a port s-, a port D and a port f, the controller is provided with a port e1 to eN + X, a port eb and a port f, and the loss compensation unit b is provided with a port b +, a port b-, a port eb and a port db;

the port eb and the port eK of the controller respectively control the on-off of the lossy compensation unit b and the impedance compensation unit K, the magnitude of current ib flowing out of a port b-of the lossy compensation unit b or the magnitude of current iK flowing out of a port bK of the impedance compensation unit K when the lossy compensation unit b or the impedance compensation unit K is conducted are both determined by a port f of the controller, the magnitude of equivalent impedance of the lossy compensation unit b or the impedance compensation unit K is determined by a port d of the controlled current source when the lossy compensation unit b or the impedance compensation unit K is conducted, the change of the equivalent impedance of the lossy compensation unit b or the impedance compensation unit K can improve the linearity of the controlled current source when the lossy compensation unit b or the impedance compensation unit K is conducted, the value range of K is 1 to N + X, and N and X are both integers greater than 0;

in the formula, the function fi (t) is any input current envelope function which meets the requirements of PF, THDi, input current harmonic components and the like, the voltages V01 and V02 are respectively a lower limit voltage and an upper limit voltage corresponding to the absolute value | vac | of the single-phase alternating-current power supply voltage when the lossy compensation unit b is conducted in the lighting mode, the voltage VK is the forward conduction voltage drop of the LED string GK, and V01 is more than or equal to 0 and V02 is more than or equal to V1.

7. The segmented LED drive circuit including a loss input current waveform compensation unit of claim 6, wherein: the loss compensation unit b comprises a PNP type BJT tube Qb1_1, an NPN type BJT tube Qb2_1, an NPN type BJT tube Qb3_1, a resistor Rb1_1, a resistor Rb2_1, a resistor Rb3_1, a resistor Rb4_1 and a resistor Rb5_1, a port b + of the loss compensation unit b is connected with an emitter of the PNP type BJT tube Qb1_1, a collector of the PNP type BJT tube Qb1_1 is connected with one end of the resistor Rb1_1, the other end of the resistor Rb1_1 is connected with a port b-of the loss compensation unit b, a base of the PNP type BJT tube Qb1_1 is connected with one end of the resistor Rb2_1, the other end of the resistor Rb 84 _1 is connected with a collector of the NPN type BJT tube Qb2_1, a base of the NPN type BJT tube Qb2_1 is simultaneously connected with one end of the resistor Rb3_ 461 and one end of the resistor Rb 3748 _1, the other end of the NPN type BJT tube Rb is connected with a collector port Rb 5731, a collector of the NPN type BJT tube Rb 58573, the base electrode of the NPN BJT transistor Qb3_1 is connected with one end of a resistor Rb5_1, the other end of the resistor Rb5_1 is connected with a port db of the lossy compensation unit b, and the emitter of the NPN BJT transistor Qb2_1 and the emitter of the NPN BJT transistor Qb3_1 are both connected with a port s-of a controlled current source.

8. The segmented LED drive circuit including a loss input current waveform compensation unit of claim 6, wherein: the loss compensation unit b comprises a PNP BJT tube Qb1_2, an NPN BJT tube Qb2_2, a PNP BJT tube Qb3_2, a PNP BJT tube Qb4_2, a resistor Rb1_2, a resistor Rb2_2, a resistor Rb3_2, a resistor Rb4_2 and a resistor Rb5_2, wherein a port b + of the loss compensation unit b is connected with an emitter of the PNP BJT tube Qb1_2, a collector of the PNP BJT tube Qb1_2 is connected with an emitter of the PNP BJT tube Qb4_2, a collector of the PNP BJT tube Qb4_2 is connected with one end of the resistor Rb1_2, the other end of the resistor Rb1_2 is connected with the port b-2 of the loss compensation unit b, a base of the PNP BJT tube Qb1_2 is connected with one end of the resistor Rb 27 _2, the other end of the resistor Rb2_2 is connected with the Qb2 Qb of the NPN BJT tube Qb, a collector of the NPN BJT tube Rb 585732 is connected with one end of the resistor Rb 24 _ Rb2, and the other end of the NPN BJT tube Rb _, the base electrode of the PNP type BJT tube Qb4_2 is connected with one end of a resistor Rb4_2, the other end of the resistor Rb4_2 is connected with the emitter electrode of the PNP type BJT tube Qb3_2, the base electrode of the PNP type BJT tube Qb3_2 is connected with one end of a resistor Rb5_2, the other end of the resistor Rb5_2 is connected with a port db of a loss compensation unit b, and the emitter electrode of the NPN type BJT tube Qb2_2 and the collector electrode of the PNP type BJT tube Qb3_2 are both connected with a port s-of a controlled current source.