CN118801671B - Switching power supply circuit based on harmonic compensation - Google Patents
Switching power supply circuit based on harmonic compensation Download PDFInfo
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- CN118801671B CN118801671B CN202411284064.9A CN202411284064A CN118801671B CN 118801671 B CN118801671 B CN 118801671B CN 202411284064 A CN202411284064 A CN 202411284064A CN 118801671 B CN118801671 B CN 118801671B
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- 239000003990 capacitor Substances 0.000 claims abstract description 123
- 238000004146 energy storage Methods 0.000 claims abstract description 44
- 238000001914 filtration Methods 0.000 claims description 69
- 238000004804 winding Methods 0.000 claims description 24
- 101100395461 Homo sapiens HPCA gene Proteins 0.000 claims description 22
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- 230000008878 coupling Effects 0.000 claims description 17
- 238000010168 coupling process Methods 0.000 claims description 17
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- 238000005516 engineering process Methods 0.000 description 16
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- 238000002955 isolation Methods 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from AC input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from DC input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to the technical field of switching power supply control, and provides a switching power supply circuit based on harmonic compensation. The invention adds the harmonic compensation module, and uses the energy storage capacitor EC1 or the energy storage capacitor EC2 to carry out relay voltage compensation when the sine wave alternating current is input, so that the diodes in the rectifier bridge are conducted in the time period from the instantaneous value of the alternating current input voltage (VEC 3-2 x n x VO) to the positive peak value and in the time period from the positive peak value to the negative peak value change, and the conduction angle of the diodes in the rectifier bridge is widened.
Description
Technical Field
The invention relates to the technical field of switching power supply control, in particular to a switching power supply circuit based on harmonic compensation.
Background
In the use process of the switching power supply, harmonic interference can be generated when the semiconductor device is turned on and turned off, and the alternating current rectifying and filtering circuit of the switching power supply needs to use a large-capacity capacitor to filter and obtain smooth direct current, so that reactive power is increased, the quality of a power grid is reduced, and the normal operation of other electric equipment is influenced. Therefore, a limit standard for limiting current harmonics of electric equipment is issued in many countries, and it is necessary to suppress the current harmonics and compensate reactive power of the switching power supply, so as to meet the standards of each country.
At present, technologies of current harmonic suppression and reactive compensation of a switching power supply mainly comprise a passive compensation technology and an active compensation technology, and the technologies are as follows:
(1) The passive network formed by the inductor and the capacitor is used for harmonic suppression and reactive compensation, and the volume and the weight of the required filter capacitor and the filter inductor are large, so that the power supply is large in volume, low in efficiency and high in cost;
(2) The common passive progressive compensation technology can also restrain harmonic waves and compensate reactive power, but the direct current obtained after filtering is low in voltage and large in ripple, so that the switching power supply is low in efficiency and low in output performance.
(3) A low-harmonic switching power supply adopting a two-stage conversion circuit is adopted, wherein the first stage is an active power factor correction circuit based on a Boost converter at an alternating current input side, and the second stage is an isolated DC-DC conversion circuit.
(4) The low-harmonic switching power supply adopting the single-stage switching circuit is a single-stage switching circuit of a single-stage isolation PFC correction technology working in a discontinuous mode and a critical continuous mode.
The techniques adopt active switch control technology, can inhibit current harmonic wave from being lower than standard limit value, and input power factor can be close to 1, but the techniques all need a special controller chip to drive a switch to control energy storage or release of an inductor to achieve active power factor correction, so that a control circuit of a switch power supply is relatively complex and high in cost, and the voltage ripple output by the switch power supply adopting single-stage isolated PFC correction technology is relatively large, the output performance is low, and the switch power supply is not suitable for equipment with high requirement on voltage precision.
Disclosure of Invention
The invention provides a switching power supply circuit based on harmonic compensation, which solves the technical problems that the existing active switching control is limited by a special controller chip, and the circuit has high complexity, high cost, larger voltage ripple and larger voltage ripple.
The invention provides a switching power supply circuit based on harmonic compensation, which comprises a rectifying module, a first filtering module, a PWM half-bridge circuit, a harmonic compensation module and a current detection module, wherein the rectifying module, the first filtering module and the PWM half-bridge circuit are sequentially connected;
the harmonic compensation module performs voltage division detection through the current detection module, the fluctuation amplitude of the primary side output voltage detected by the primary side circuit is further generated according to the fluctuation amplitude to generate compensation adjustment voltage changing along the opposite direction of the fluctuation amplitude, the compensation adjustment voltage is added to the output end of the rectification module, and harmonic compensation is performed.
In a further embodiment, the harmonic compensation module comprises a second filtering module, a rectifier bridge BDR2, an energy storage capacitor EC1 and an energy storage capacitor EC2, wherein one end of the second filtering module is connected with a primary side circuit of the PWM half-bridge circuit, and the other end of the second filtering module is connected with a negative output end of the rectifier bridge BDR 2;
The positive output end of the rectifier bridge BDR2 is connected with the output end of the rectifier module, the first input end of the rectifier bridge BDR2 is connected with the positive electrode of the energy storage capacitor EC1, the second input end of the rectifier bridge BDR2 is connected with the positive electrode of the energy storage capacitor EC2, the negative electrode of the energy storage capacitor EC1 is connected with the first input end of the rectifier module and is connected with the input end L of the alternating current power supply, and the negative electrode of the energy storage capacitor EC2 is connected with the second input end of the rectifier module and is connected with the input end N of the alternating current power supply.
In a further embodiment, the second filtering module includes a filtering capacitor C1 and a filtering inductor L1, one end of the filtering capacitor C1 is grounded, the other end of the filtering capacitor C1 is connected with the negative output end of the rectifier bridge BDR2, one end of the filtering inductor L1 is connected with the primary side circuit of the PWM half-bridge circuit, the other end of the filtering inductor L1 is connected with the negative output end of the rectifier bridge BDR2, and the filtering capacitor C1 and the filtering inductor L1 are used for filtering out high-frequency switch pulsation components detected from the primary side output voltage.
In a further embodiment, the rectifying module comprises a rectifying bridge BDR1, a first input end and a second input end of the rectifying bridge BDR1 are respectively connected with an alternating current power supply input end L and an alternating current power supply input end N, a positive output end of the rectifying bridge BDR1 is connected with the first filtering module, a negative output end of the rectifying bridge BDR1 is connected with a ground, and the rectifying bridge BDR1 is used for rectifying alternating current input to output direct current power supply.
In a further embodiment, the first filtering module includes an inductor L2 and a capacitor C3, one end of the inductor L2 is connected to the positive output end of the rectifying module, the other end of the inductor L2 is connected to the PWM half-bridge circuit, one end of the capacitor C3 is connected to the positive output end of the rectifying module, and the other end of the capacitor C3 is grounded, and the inductor L2 and the capacitor C3 are used for forming a high-frequency filtering circuit to filter high-frequency interference signals in the rectified dc power supply.
In a further embodiment, the PWM half-bridge circuit comprises a first switching tube Q1, a second switching tube Q2, a transformer TR1, a filter capacitor EC3 and a coupling capacitor C2;
The first end of the first switching tube Q1 is connected with the output end of the first filtering module, the second end of the first switching tube Q1 is connected with the first end of the primary winding of the transformer TR1, the first end of the second switching tube Q2 is connected with the first end of the primary winding of the transformer TR1, the second end of the second switching tube Q2 is connected with the current detection module, one end of the coupling capacitor C2 is connected with the second end of the primary winding of the transformer TR1, the other end of the coupling capacitor C2 is connected with the current detection module, the second end of the primary winding of the transformer TR1 is also connected with the harmonic compensation module, and one end of the filtering capacitor EC3 is connected between the first end of the first switching tube Q1 and the output end of the first filtering module, and the other end of the filtering capacitor EC3 is grounded.
In a further embodiment, the current detection module includes a resistor R1, where one end of the resistor R1 is connected to the second end of the second switching tube Q2, and is further connected to the second end of the primary winding of the transformer TR1 through a coupling capacitor C2.
In a further embodiment, the filter device further comprises a third filter module, the third filter module comprises a capacitor CX1 and a common-mode inductor L3 which are sequentially connected, the input end of the common-mode inductor L3 is connected with an alternating-current power supply input end L and an alternating-current power supply input end N, the output end of the common-mode inductor L is connected with the rectifying module and the harmonic compensation module, and two ends of the capacitor CX1 are respectively connected with the alternating-current power supply input end L and the alternating-current power supply input end N.
In a further embodiment, the PWM half-bridge circuit further includes a secondary rectifying module, where the secondary rectifying module includes a rectifying diode D9 and a filter capacitor EC4, the positive electrode of the rectifying diode D9 is connected to the dc output terminal VO-, the negative electrode of the rectifying diode D9 is connected to the first end of the secondary winding of the transformer TR1, the positive electrode of the filter capacitor EC4 is connected to the second end of the secondary winding of the transformer TR1, the dc output terminal vo+, and the negative electrode of the filter capacitor EC4 is connected to the positive electrode of the rectifying diode D9, the dc output terminal VO-.
In a further embodiment, the first switching tube Q1 is an N-channel MOS tube or a P-channel MOS tube, and the second switching tube Q2 is an N-channel MOS tube or a P-channel MOS tube.
The beneficial effects of the invention are as follows:
By adding the harmonic compensation module, relay voltage compensation is carried out by using the energy storage capacitor EC1 or the energy storage capacitor EC2 when sine wave alternating current is input, diodes in the rectifier bridge are conducted in a period from an alternating current input voltage instantaneous value (VEC 3-2 x n x VO) to a positive peak value and a period from a positive peak value to a negative peak value change period, so that the conduction angle of the diodes in the rectifier bridge is widened, the effective value of input current is reduced, harmonic current is suppressed, reactive power is reduced, the power factor is improved, and a filter capacitor C1 and a filter inductor L1 are arranged at the detection end of the rectifier bridge BDR2 and are used for filtering high-frequency switch pulsation components detected from primary side output voltage, and compensation precision is further improved. And because the rectifier bridge BDR2, the energy storage capacitor EC1 and the energy storage capacitor EC2 are taken as cores, a harmonic compensation mechanism is constructed, so that the energy storage capacitor EC2 is formed by the following steps:
(1) Compared with a switching power supply adopting a passive compensation technology of a common inductor and a capacitor, the application has the advantages of smaller volume, higher efficiency and lower cost;
(2) Compared with a switching power supply adopting a passive progressive compensation technology, the switching power supply has the advantages of small output ripple, higher efficiency and higher output performance;
(3) Compared with a switching power supply adopting an active compensation technology based on a Boost converter, the switching power supply has the advantages of simple circuit, fewer used devices and lower cost;
(4) Compared with a switching power supply adopting a single-stage isolation PFC correction technology, the switching power supply has the advantages of smaller output ripple, higher efficiency and higher output performance.
Drawings
Fig. 1 is a system frame diagram of a switching power supply circuit based on harmonic compensation according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of the hardware of FIG. 1 provided by an embodiment of the present invention;
The device comprises a rectifying module 1, a first filtering module 2, a PWM half-bridge circuit 3, a harmonic compensation module 4, a current detection module 5 and a third filtering module 6.
Detailed Description
The following examples are given for the purpose of illustration only and are not to be construed as limiting the invention, including the drawings for reference and description only, and are not to be construed as limiting the scope of the invention as many variations thereof are possible without departing from the spirit and scope of the invention.
In the embodiment of the invention, as shown in fig. 1 and 2, a rectifying module 1, a first filtering module 2, a PWM half-bridge circuit 3, a harmonic compensation module 4 and a current detection module 5 are sequentially connected, wherein the current detection module 5 is connected with a primary side circuit of the PWM half-bridge circuit 3, the input end of the harmonic compensation module 4 is connected with an alternating current input, and the output end of the harmonic compensation module 4 is connected with the output end of the rectifying module 1;
The harmonic compensation module 4 performs voltage division detection through the current detection module 5, and generates a compensation adjustment voltage which changes along the opposite direction of the fluctuation amplitude according to the fluctuation amplitude of the primary side output voltage detected by the primary side circuit, and adds the compensation adjustment voltage to the output end of the rectification module 1 to execute harmonic compensation.
In this embodiment, the harmonic compensation module 4 includes a second filtering module, a rectifier bridge BDR2, an energy storage capacitor EC1 and an energy storage capacitor EC2, where one end of the second filtering module is connected to the primary side circuit of the PWM half-bridge circuit 3, and the other end of the second filtering module is connected to the negative output end of the rectifier bridge BDR 2;
The positive output end of the rectifier bridge BDR2 is connected with the output end of the rectifier module 1, the first input end of the rectifier bridge BDR2 is connected with the positive electrode of the energy storage capacitor EC1, the second input end of the rectifier bridge BDR2 is connected with the positive electrode of the energy storage capacitor EC2, the negative electrode of the energy storage capacitor EC1 is connected with the first input end of the rectifier module 1 and is connected with the alternating current power supply input end L, and the negative electrode of the energy storage capacitor EC2 is connected with the second input end of the rectifier module 1 and is connected with the alternating current power supply input end N.
In this embodiment, the second filtering module includes a filtering capacitor C1 and a filtering inductor L1, where one end of the filtering capacitor C1 is grounded, the other end of the filtering capacitor C1 is connected to the negative output end of the rectifier bridge BDR2, one end of the filtering inductor L1 is connected to the primary side circuit of the PWM half-bridge circuit 3, and the other end of the filtering inductor L1 is connected to the negative output end of the rectifier bridge BDR2, and the filtering capacitor C1 and the filtering inductor L1 are used to filter the high-frequency switch ripple component detected from the primary side output voltage.
In this embodiment, the rectifying module 1 includes a rectifying bridge BDR1, where a first input end and a second input end of the rectifying bridge BDR1 are respectively connected to an ac power input end L and an ac power input end N, a positive output end of the rectifying bridge BDR1 is connected to the first filtering module 2, and a negative output end of the rectifying bridge is grounded, and the rectifying bridge BDR1 is configured to rectify an ac input to output a dc power.
In this embodiment, the first filtering module 2 includes an inductor L2 and a capacitor C3, where one end of the inductor L2 is connected to the positive output end of the rectifying module 1, and the other end of the inductor L2 is connected to the PWM half-bridge circuit 3, one end of the capacitor C3 is connected to the positive output end of the rectifying module 1, and the other end of the capacitor C3 is grounded, and the inductor L2 and the capacitor C3 are used to form a high-frequency filtering circuit to filter high-frequency interference signals in the rectified dc power supply.
In this embodiment, the PWM half-bridge circuit 3 includes a first switching tube Q1, a second switching tube Q2, a transformer TR1, a filter capacitor EC3, and a coupling capacitor C2;
The control end (gate exemplified by a MOS tube) of the first switching tube Q1 and the control end (gate exemplified by a MOS tube) of the second switching tube Q2 are both connected with a main controller (not depicted in this embodiment, for example, a power supply chip of a switching power supply circuit), and the main controller outputs driving pulses according to preset logic timing to control the first switching tube Q1 and the second switching tube Q2 to be alternately turned on so as to release the energy of the coupling capacitor C2.
The first end of the first switching tube Q1 is connected with the output end of the first filter module 2, the second end of the first switching tube Q1 is connected with the first end of the primary winding of the transformer TR1, the first end of the second switching tube Q2 is connected with the first end of the primary winding of the transformer TR1, the second end of the second switching tube Q2 is connected with the current detection module 5, one end of the coupling capacitor C2 is connected with the second end of the primary winding of the transformer TR1, the other end of the coupling capacitor C2 is connected with the current detection module 5, the second end of the primary winding of the transformer TR1 is also connected with the harmonic compensation module 4, and one end of the filter capacitor EC3 is connected between the first end of the first switching tube Q1 and the output end of the first filter module 2, and the other end of the filter capacitor EC3 is grounded.
In this embodiment, the current detection module 5 includes a resistor R1, where one end of the resistor R1 is connected to the second end of the second switching tube Q2, and is further connected to the second end of the primary winding of the transformer TR1 through a coupling capacitor C2.
In this embodiment, the filter device further includes a third filter module 6, where the third filter module 6 includes a capacitor CX1 and a common-mode inductor L3 that are sequentially connected, an input end of the common-mode inductor L3 is connected to the ac power input end L and the ac power input end N, an output end of the common-mode inductor L3 is connected to the rectifier module 1 and the harmonic compensation module 4, and two ends of the capacitor CX1 are respectively connected to the ac power input end L and the ac power input end N.
In this embodiment, the PWM half-bridge circuit 3 further includes a secondary rectifying module 1, where the secondary rectifying module 1 includes a rectifying diode D9 and a filter capacitor EC4, the positive electrode of the rectifying diode D9 is connected to the dc output terminal VO-, the negative electrode of the rectifying diode D9 is connected to the first end of the secondary winding of the transformer TR1, the positive electrode of the filter capacitor EC4 is connected to the second end of the secondary winding of the transformer TR1, the dc output terminal vo+, and the negative electrode of the filter capacitor EC is connected to the positive electrode of the rectifying diode D9, the dc output terminal VO-.
In this embodiment, the first switching tube Q1 is an N-channel MOS tube or a P-channel MOS tube, and the second switching tube Q2 is an N-channel MOS tube or a P-channel MOS tube.
In this embodiment, the invention further comprises a current fuse F1 connected in series with the hot line L.
Taking the first switching tube Q1 as an N-channel MOS tube and the second switching tube Q2 as an N-channel MOS tube as an example, the working principle of this embodiment is as follows:
1. the switching power supply stabilizes the working principle.
When the gate (GDH end) of the first switching tube Q1 receives a driving pulse with a duty ratio D to turn on the first switching tube Q1, the voltage VEC3 across the filter capacitor EC3 is applied to the series circuit of the primary winding of the transformer TR1 and the coupling capacitor C2, and the primary winding of the transformer TR1 is excited to store energy.
When the gate (GDL end) of the second switching tube Q2 receives a driving pulse with a duty ratio of 1-D, the second switching tube Q2 is turned on, and the energy stored in the transformer TR1 is released to the coupling capacitor C2. At the same time, the rectifier diode D9 on the secondary side is turned on, and the stored energy of the transformer TR1 is also released to the output terminal, and the output voltage vo=vec3×d/n (where n is the primary-secondary winding turns ratio of the transformer TR 1). As described above, the voltage across the coupling capacitor C2 is clamped at about n×vo, and the high-frequency switching ripple component is contained in the coupling capacitor, and the inductance L1 of the harmonic compensation circuit unit and the capacitor C1 act to filter out the high-frequency switching ripple component, so that the terminal voltage VC1 of the capacitor C1 is approximately n×vo.
2. Taking the negative half cycle of the ac input voltage as an example, a specific harmonic compensation process is as follows.
Since the potential of the ac input terminal N is higher than the potential of the ac input terminal L, the energy storage capacitor EC1 is charged, the energy storage capacitor EC2 is discharged, the ac input voltage is rectified by the rectifier bridge BR1 near the peak value of the negative half cycle of the ac input voltage, the filter capacitor EC3 is charged after being filtered by the high-frequency filter circuit composed of the capacitor C3 and the inductor L2, the end voltage VEC3 of the filter capacitor EC3 is approximately equal to the peak value VAC of the ac input voltage, and since VAC-VEC2 is approximately equal to VEC3-N VO, the end voltage of the energy storage capacitor EC1 is approximately N VO. After the energy storage capacitor EC2 is completely discharged, the end voltage VEC2 is zero, and as the ac input voltage changes from the negative peak value to the positive direction, when the instantaneous value of the ac input voltage rises to (VEC 3-2×n×vo), the instantaneous value of the voltage added by the voltage of the energy storage capacitor EC1 exceeds the end voltage VEC3 of the capacitor EC3 at this time, and the diode D5 and the diode D7 in the rectifier bridge BDR2 are turned on to charge the filter capacitor EC 3.
At this time, the energy storage capacitor EC1 starts to discharge, the energy storage capacitor EC2 starts to charge, when the energy storage of the energy storage capacitor EC1 is released, the terminal voltage of the energy storage capacitor EC2 is zero (vec1=0), the terminal voltage of the energy storage capacitor EC2 is approximately vec2=n×vo, and the diode D5 and the diode D7 in the rectifier bridge BR2 are turned off. In this way, the ac input voltage continues to change to the positive peak value, and the diode D1 and the diode D3 in the rectifier bridge BR1 are turned on, and the filter capacitor EC3 is continuously charged. At the moment when the ac input voltage changes from a positive peak value to a negative peak value, the instantaneous value of the ac input voltage will be lower than the terminal voltage of the capacitor EC3, and the diode D1 and the diode D3 will be turned off.
From the above analysis, it is known that the rectifier is turned on in the period from the instantaneous value of the ac input voltage (VEC 3-2 x n x vo) to the peak value of the forward direction, i.e. the conduction angle of the rectifier is widened, the effective value of the input current is reduced, the harmonic current is suppressed, the reactive power is reduced, and the power factor is increased.
In the positive half cycle of the ac input voltage, the energy storage capacitor EC1 is discharged, the energy storage capacitor EC2 is charged, and the circuit operating principle in the period of changing from the peak value of the positive half cycle to the peak value of the negative half cycle is the same as that in the period of changing from the peak value of the negative half cycle to the positive half cycle of the ac input voltage, which is not described in detail in this embodiment.
The beneficial effects of the invention are as follows:
By adding the harmonic compensation module 4, the energy storage capacitor EC1 or the energy storage capacitor EC2 is utilized to carry out relay voltage compensation during the input of sine wave alternating current, so that the diodes in the rectifier bridge are conducted in the period from the instantaneous value of the alternating current input voltage (VEC 3-2 x n x VO) to the positive peak value and in the period from the positive peak value to the negative peak value change period, the conduction angle of the diodes in the rectifier bridge is widened, and the effective value of the input current is reduced, the harmonic current is suppressed, the reactive power is reduced, and the power factor is improved. Because the rectifier bridge BDR2, the energy storage capacitor EC1 and the energy storage capacitor EC2 are taken as cores, a harmonic compensation mechanism is constructed, so that the energy storage capacitor EC2 is formed by the following steps:
(1) Compared with a switching power supply adopting a passive compensation technology of a common inductor and a capacitor, the application has the advantages of smaller volume, higher efficiency and lower cost;
(2) Compared with a switching power supply adopting a passive progressive compensation technology, the switching power supply has the advantages of small output ripple, higher efficiency and higher output performance;
(3) Compared with a switching power supply adopting an active compensation technology based on a Boost converter, the switching power supply has the advantages of simple circuit, fewer used devices and lower cost;
(4) Compared with a switching power supply adopting a single-stage isolation PFC correction technology, the switching power supply has the advantages of smaller output ripple, higher efficiency and higher output performance.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (9)
1. The switching power supply circuit based on harmonic compensation is characterized by comprising a rectifying module, a first filtering module, a PWM half-bridge circuit, a harmonic compensation module and a current detection module which are sequentially connected, wherein the current detection module is connected with a primary side circuit of the PWM half-bridge circuit;
The harmonic compensation module performs partial pressure detection through the current detection module, and the fluctuation amplitude of the primary side output voltage detected by the primary side circuit is further used for generating a compensation adjustment voltage which changes along the opposite direction of the fluctuation amplitude according to the fluctuation amplitude, and the compensation adjustment voltage is added to the output end of the rectification module to execute harmonic compensation;
The harmonic compensation module comprises a second filtering module, a rectifier bridge BDR2, an energy storage capacitor EC1 and an energy storage capacitor EC2, wherein one end of the second filtering module is connected with a primary side circuit of the PWM half-bridge circuit, and the other end of the second filtering module is connected with a negative output end of the rectifier bridge BDR 2;
The positive output end of the rectifier bridge BDR2 is connected with the output end of the rectifier module, the first input end of the rectifier bridge BDR2 is connected with the positive electrode of the energy storage capacitor EC1, the second input end of the rectifier bridge BDR2 is connected with the positive electrode of the energy storage capacitor EC2, the negative electrode of the energy storage capacitor EC1 is connected with the first input end of the rectifier module and is connected with the input end L of the alternating current power supply, and the negative electrode of the energy storage capacitor EC2 is connected with the second input end of the rectifier module and is connected with the input end N of the alternating current power supply.
2. A switching power supply circuit based on harmonic compensation according to claim 1, wherein the second filtering module comprises a filtering capacitor C1 and a filtering inductor L1, one end of the filtering capacitor C1 is grounded, the other end of the filtering capacitor C1 is connected with a negative output end of the rectifier bridge BDR2, one end of the filtering inductor L1 is connected with a primary side circuit of the PWM half-bridge circuit, the other end of the filtering inductor L1 is connected with the negative output end of the rectifier bridge BDR2, and the filtering capacitor C1 and the filtering inductor L1 are used for filtering high-frequency switching pulsation components detected from primary side output voltage.
3. The switching power supply circuit based on harmonic compensation of claim 1, wherein the rectifying module comprises a rectifying bridge BDR1, a first input end and a second input end of the rectifying bridge BDR1 are respectively connected with an alternating current power supply input end L and an alternating current power supply input end N, a positive output end of the rectifying bridge BDR1 is connected with the first filtering module, a negative output end of the rectifying bridge BDR1 is grounded, and the rectifying bridge BDR1 is used for rectifying an alternating current input to output a direct current power supply.
4. A switching power supply circuit based on harmonic compensation according to claim 3 is characterized in that the first filtering module comprises an inductor L2 and a capacitor C3, one end of the inductor L2 is connected with the positive output end of the rectifying module, the other end of the inductor L2 is connected with the PWM half-bridge circuit, one end of the capacitor C3 is connected with the positive output end of the rectifying module, the other end of the capacitor C3 is grounded, and the inductor L2 and the capacitor C3 are used for forming a high-frequency filtering circuit to filter high-frequency interference signals in the rectified direct-current power supply.
5. A switching power supply circuit based on harmonic compensation as set forth in claim 4, wherein said PWM half-bridge circuit comprises a first switching tube Q1, a second switching tube Q2, a transformer TR1, a filter capacitor EC3 and a coupling capacitor C2;
The first end of the first switching tube Q1 is connected with the output end of the first filtering module, the second end of the first switching tube Q1 is connected with the first end of the primary winding of the transformer TR1, the first end of the second switching tube Q2 is connected with the first end of the primary winding of the transformer TR1, the second end of the second switching tube Q2 is connected with the current detection module, one end of the coupling capacitor C2 is connected with the second end of the primary winding of the transformer TR1, the other end of the coupling capacitor C2 is connected with the current detection module, the second end of the primary winding of the transformer TR1 is also connected with the harmonic compensation module, and one end of the filtering capacitor EC3 is connected between the first end of the first switching tube Q1 and the output end of the first filtering module, and the other end of the filtering capacitor EC3 is grounded.
6. A switching power supply circuit based on harmonic compensation according to claim 5, wherein said current detection module comprises a resistor R1, one end of the resistor R1 is connected to the second end of the second switching tube Q2, and is further connected to the second end of the primary winding of the transformer TR1 through a coupling capacitor C2.
7. The switching power supply circuit based on harmonic compensation of claim 3, further comprising a third filtering module, wherein the third filtering module comprises a capacitor CX1 and a common-mode inductor L3 which are sequentially connected, the input end of the common-mode inductor L3 is connected with an alternating-current power supply input end L and an alternating-current power supply input end N, the output end of the common-mode inductor L3 is connected with the rectifying module and the harmonic compensation module, and two ends of the capacitor CX1 are respectively connected with the alternating-current power supply input end L and the alternating-current power supply input end N.
8. A switching power supply circuit based on harmonic compensation according to claim 5, wherein the PWM half-bridge circuit further comprises a secondary side rectifying module, the secondary side rectifying module comprises a rectifying diode D9 and a filtering capacitor EC4, the positive electrode of the rectifying diode D9 is connected with a direct current output end VO-, the negative electrode of the rectifying diode D9 is connected with a first end of a secondary winding of the transformer TR1, the positive electrode of the filtering capacitor EC4 is connected with a second end of the secondary winding of the transformer TR1, the direct current output end VO+ and the negative electrode of the filtering capacitor EC4 is connected with the positive electrode of the rectifying diode D9 and the direct current output end VO-.
9. The switching power supply circuit based on harmonic compensation of claim 5, wherein the first switching tube Q1 is an N-channel MOS tube or a P-channel MOS tube, and the second switching tube Q2 is an N-channel MOS tube or a P-channel MOS tube.
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| CN116961389A (en) * | 2023-07-18 | 2023-10-27 | 通力科技股份有限公司 | Switching power supply harmonic wave improving circuit, method and device |
| CN118399722A (en) * | 2024-05-06 | 2024-07-26 | 珠海楠欣半导体科技有限公司 | Controller, control method, half-bridge flyback converter, chip and electronic equipment |
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| DE69531868T8 (en) * | 1994-01-28 | 2004-10-14 | Matsushita Electric Industrial Co., Ltd., Kadoma | Switching Power Supply |
| JPH08331850A (en) * | 1995-05-30 | 1996-12-13 | Nemic Lambda Kk | Power supply |
| CN109088536B (en) * | 2017-06-13 | 2021-02-12 | 华润微集成电路(无锡)有限公司 | Active power factor correction circuit and method for improving harmonic waves and driving system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116961389A (en) * | 2023-07-18 | 2023-10-27 | 通力科技股份有限公司 | Switching power supply harmonic wave improving circuit, method and device |
| CN118399722A (en) * | 2024-05-06 | 2024-07-26 | 珠海楠欣半导体科技有限公司 | Controller, control method, half-bridge flyback converter, chip and electronic equipment |
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