CN217931786U - Phase compensation sampling circuit - Google Patents
Phase compensation sampling circuit Download PDFInfo
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- CN217931786U CN217931786U CN202221288987.8U CN202221288987U CN217931786U CN 217931786 U CN217931786 U CN 217931786U CN 202221288987 U CN202221288987 U CN 202221288987U CN 217931786 U CN217931786 U CN 217931786U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The application discloses phase compensation sampling circuit relates to synchronous rectification field. In the phase compensation sampling circuit, the first end of each first resistor is respectively connected with a zero line and a live wire of an alternating current power supply of an active rectification circuit or a bridgeless PFC circuit; the second end of each first resistor is respectively connected with the first end of a second resistor of the sampling circuit, and the second end of each second resistor is grounded; the second end of each first resistor is connected with a driving module of the active rectifying circuit or the bridgeless PFC circuit and used for inputting the acquired voltage sampling signal to the driving module; the driving module is connected with a switching tube of the active rectifying circuit or the bridgeless PFC circuit to control the switching tube to be switched on and off; the first resistor is provided with a resistor which is connected with the capacitor of the same sampling circuit in parallel. The capacitor can compensate the lagging alternating voltage, so that the synchronous rectifier tube can be synchronously switched on or off with the alternating current power supply without phase difference, and the loss of devices is avoided.
Description
Technical Field
The application relates to the field of synchronous rectification, in particular to a phase compensation sampling circuit.
Background
In the switching power supply, the input end of an active rectifying circuit is connected with an alternating current power supply, wherein the active rectifying circuit generally comprises four rectifying diodes, and a PFC circuit is connected behind the active rectifying circuit, so that the aims of converting voltage and correcting power factor are fulfilled. Because the diode in the active rectification circuit has larger loss when being conducted, the efficiency of the driving power supply is greatly reduced, therefore, a Metal Oxide Semiconductor Field Effect Transistor (MOS tube) with smaller loss can be used for replacing part or all of the diodes in the active rectification circuit to be used as a synchronous rectification tube. In addition, a bridgeless Power Factor Correction (PFC) circuit is provided, which includes a switching tube and an inductor in addition to a synchronous rectifier tube, so that the function of the PFC is directly realized by the rectifier circuit without adding a PFC circuit at the rear stage of the rectifier circuit, and therefore the bridgeless PFC circuit is called. When the synchronous rectifier tube is applied to an active rectifier circuit such as an active rectifier circuit and a bridgeless PFC circuit, the on or off of the synchronous rectifier tube needs to be controlled by a driving signal.
However, in the control circuit of the synchronous rectifier, there is a time delay from sampling to control, so that the on time and the off time of the switching tube are delayed compared with the commutation time of the ac voltage, and the synchronous rectifier cannot be turned on or off synchronously with the ac power supply without phase difference, thereby causing device loss.
In view of the above, a sampling circuit capable of avoiding device loss is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a phase compensation sampling circuit to avoid device loss during synchronous rectification.
In order to solve the technical problem, the application provides a phase compensation sampling circuit, which is applied to an active rectification circuit or a bridgeless PFC circuit, wherein the active rectification circuit or the bridgeless PFC circuit at least comprises two switching tubes working in a power frequency state; the phase compensated sampling circuit comprises: the first sampling circuit and the second sampling circuit; the first sampling circuit and the second sampling circuit each include: the circuit comprises a capacitor, a first resistor and a second resistor;
the first end of each first resistor is respectively connected with a zero line and a live wire of an alternating current power supply of the active rectifying circuit or the bridgeless PFC circuit;
the second end of each first resistor is respectively connected with the first end of the second resistor of the sampling circuit, and the second end of each second resistor is grounded;
the second end of each first resistor is connected with the driving module 10 of the active rectifying circuit or the bridgeless PFC circuit, and is used for inputting the acquired voltage sampling signal to the driving module 10;
the driving module 10 is connected with the switching tube of the active rectifying circuit or the bridgeless PFC circuit and is used for controlling the switching tube to be switched on and off according to the voltage sampling signal;
the first resistor is provided with a resistor which is connected with the capacitor of the sampling circuit in parallel, and the capacitor and the second resistor of the sampling circuit in series are connected between the alternating current power supply and the ground.
Preferably, the active rectification circuit includes: the rectifier comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein each switching tube forms a rectifier bridge;
and the alternating current power supply is connected with the load through the rectifier bridge and is used for providing direct current for the load according to the on and off of each switching tube.
Preferably, each switch tube is a Mos tube.
Preferably, the bridgeless PFC circuit comprises: the first inductor, the two high-frequency switch tubes and the two power-frequency switch tubes; the two high-frequency switch tubes comprise a first high-frequency switch tube and a second high-frequency switch tube, and the two power frequency switch tubes comprise a first power frequency switch tube and a second power frequency switch tube;
the live wire of the alternating current power supply is connected with the two high-frequency switch tubes through the first inductor, and the zero line of the alternating current power supply is connected with the two power frequency switch tubes;
the driving module 10 is respectively connected with the two power frequency switch tubes and is used for controlling the on-off of each power frequency switch tube according to the voltage sampling signal;
and the alternating current power supply is connected with the load through each switching tube and is used for providing direct current for the load according to the on and off of the two power frequency switching tubes.
Preferably, the bridgeless PFC circuit comprises: the second inductor, the third high-frequency switching tube, the fourth high-frequency switching tube, the third power frequency switching tube, the fourth power frequency switching tube, the first diode and the second diode;
the live wire of the alternating current power supply is connected with the third power frequency switch tube and is also connected with the third high-frequency switch tube and the first diode through the second inductor; the zero line of the alternating current power supply is connected with the fourth power frequency switching tube and is also connected with the fourth high-frequency switching tube and the second diode through the third inductor;
the driving module 10 is respectively connected to the third power frequency switching tube and the fourth power frequency switching tube, and is configured to control the third power frequency switching tube and the fourth power frequency switching tube to be turned on and off according to the voltage sampling signal;
and the alternating current power supply is connected with a load through each switching tube and each diode and is used for providing direct current for the load according to the on and off of the third power frequency switching tube and the fourth power frequency switching tube.
Preferably, each power frequency switch tube is a Mos tube, and each high frequency switch tube is a GaN tube.
Preferably, each switch tube is a Mos tube.
Preferably, the driving circuit of the active rectification circuit or the bridgeless PFC circuit is an integrated IC11.
Preferably, the active rectifier circuit or the bridgeless PFC circuit further comprises: a comparator; the output end of the phase compensation sampling circuit is connected with the inverting input end of the comparator, the output end of the comparator is connected with the integrated IC11, and the non-inverting input end of the comparator is connected with the reference voltage; the integrated IC11 drives the switching tube according to the output signal of the comparator.
The phase compensation sampling circuit is applied to an active rectification circuit or a bridgeless PFC circuit, and the active rectification circuit or the bridgeless PFC circuit at least comprises two switching tubes working in a power frequency state; the phase compensation sampling circuit includes: the sampling circuit comprises a first sampling circuit and a second sampling circuit; the first sampling circuit and the second sampling circuit each include: the circuit comprises a capacitor, a first resistor and a second resistor; the first end of each first resistor is respectively connected with a zero line and a live wire of an alternating current power supply of the active rectifying circuit or the bridgeless PFC circuit; the second end of each first resistor is respectively connected with the first end of a second resistor of the sampling circuit, and the second end of each second resistor is grounded; the second end of each first resistor is connected with a driving module of the active rectifying circuit or the bridgeless PFC circuit and used for inputting the acquired voltage sampling signal to the driving module; the driving module is connected with a switching tube of the active rectifying circuit or the bridgeless PFC circuit and is used for controlling the switching-on and switching-off of the switching tube according to the voltage sampling signal; the first resistor is provided with a resistor which is connected with the capacitor of the same sampling circuit in parallel. The capacitor can compensate the lagging alternating voltage, so that the synchronous rectifier tube can be synchronously switched on or off without phase difference with an alternating current power supply, and the loss of devices is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is an active rectifier circuit provided in an embodiment of the present application;
fig. 2 is a bridgeless PFC circuit according to an embodiment of the present disclosure;
fig. 3 is another bridgeless PFC circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a capacitor connected in parallel with a first resistor according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram of another capacitor connected in parallel with a first resistor according to an embodiment of the present disclosure;
FIG. 6 is a graph of voltage waveforms corresponding to a conventional sampling circuit;
fig. 7 is a voltage waveform diagram corresponding to the sampling circuit provided by the embodiment of the present application.
The reference numbers are as follows: 10 is a driving module, 11 is an integrated IC.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a phase compensation sampling circuit.
In order that those skilled in the art will better understand the disclosure, the following detailed description is given with reference to the accompanying drawings.
The phase compensation sampling circuit provided by the application can be applied to an active rectification circuit and a bridgeless PFC circuit, and a driving signal of a synchronous rectification tube has delay, so that the synchronous rectification tube cannot be synchronously switched on or off without phase difference with an alternating current power supply, and each device in the circuit has high loss. The phase compensation sampling circuit provided by the application can compensate the delay, and realizes synchronous turn-on or turn-off of the synchronous rectifier tube and the alternating current power supply without phase difference. The phase compensation sampling circuit that this application embodiment provided includes: the first sampling circuit and the second sampling circuit; the first sampling circuit and the second sampling circuit each include: the circuit comprises a capacitor, a first resistor and a second resistor. The first end of each first resistor is respectively connected with a zero line and a live wire of an alternating current power supply of the active rectifying circuit or the bridgeless PFC circuit; the second end of each first resistor is respectively connected with the first end of the second resistor of the sampling circuit, and the second end of each second resistor is grounded. And the second end of each first resistor is connected with a driving module of the active rectifying circuit or the bridgeless PFC circuit and used for inputting the acquired voltage sampling signal to the driving module. The driving module is connected with a switching tube of the active rectifying circuit or the bridgeless PFC circuit and is used for controlling the switching tube to be switched on and off according to the voltage sampling signal; the first resistor is provided with a resistor connected with the capacitor of the sampling circuit in parallel, and the capacitor and the second resistor of the sampling circuit are connected between the alternating current power supply and the ground in series.
Taking an active rectification circuit as an example, fig. 1 is an active rectification circuit provided in an embodiment of the present application; it should be noted that the circuit structure shown in the figures is only one of those provided in the present application, and does not limit other circuit structures provided in the present application. The active rectification circuit comprises a power unit and a control unit; the power unit comprises at least two synchronous rectifier tubes working in a power frequency state; the control unit comprises a driving module 10 and a phase compensation sampling circuit. The phase compensation sampling circuit is used for sampling the input voltage of the active rectifying circuit and inputting a voltage sampling signal into the driving module 10. Specifically, a first end of a first resistor R1 of each sampling circuit is connected to a zero line N and a live line L of an AC power supply AC (in the figure, the live line L of the AC power supply AC is connected to switching tubes S1 and S2, and the zero line N is connected to switching tubes S3 and S4), a second end of each first resistor R1 is connected to an input end of the driving module 10, a second end of each first resistor R1 is further connected to a first end of a second resistor R2 of the sampling circuit where the first resistor R1 is located (that is, the first resistor R1 in the first sampling circuit is connected to the second resistor R2, and the first resistor R1 in the second sampling circuit is connected to the second resistor R2), and a second end of each second resistor R2 is grounded. The input end of the driving module 10 receives the voltage sampling signals sent by the two sampling circuits, and the output end of the driving module 10 is connected with the synchronous rectifying tube and is used for controlling the on-off state of the synchronous rectifying tube according to the voltage sampling signals. The synchronous rectifier, i.e. the switching tube in the figure, includes a first switching tube S1, a second switching tube S2, a third switching tube S3 and a fourth switching tube S4, the switching tubes may all adopt MOS tubes, and the driving module 10 is connected to the gates of the switching tubes S1, S2, S3 and S4, and drives them according to the voltage sampling signal. In the figure, the first end of each capacitor C0 is connected to the first end of the first resistor R1 of the sampling circuit, and the second end of each capacitor C0 is connected to the second end of the first resistor R1 of the sampling circuit, that is, the capacitor C0 is connected to the first resistor R1 in parallel, so that the voltage lag caused by the driving module 10 can be compensated.
In this example, the application to a bridgeless PFC circuit is taken as an example, fig. 2 is a bridgeless PFC circuit provided in an embodiment of the present application, and a circuit shown in fig. 2 is a topology structure of the bridgeless PFC circuit. The bridgeless PFC circuit comprises two high-frequency switch tubes working in a high-frequency state, namely a first high-frequency switch tube S5 and a second high-frequency switch tube S6, two power frequency switch tubes working in a power frequency state, a first power frequency switch tube S7 and a second power frequency switch tube S8. The phase compensation sampling circuit samples the input voltage of the bridgeless PFC circuit and outputs a voltage sampling signal to the inverting input end of the comparator, the output end of the comparator is connected with the integrated IC11, and the non-inverting input end of the comparator is connected with the reference voltage. The integrated IC11 controls the switching on and off of S7 and S8. Due to the delay in the process of processing the voltage signal and outputting the driving signal by the driving module 10, the on and off times of S7 and S8 are delayed compared with the commutation time of the AC source, which may result in large on and off losses, and the lifetime of the synchronous rectifier is shortened while the overall efficiency is reduced. When the voltage of the alternating current power supply AC is in a positive half cycle, namely the voltage of the live wire L is greater than the voltage of the zero line N, S7 is in a closed state, S8 is in a conducting state, and current flows from the drain electrode to the source electrode of S8; when S5 is off, S6 is on. The current returns to the zero line N from the live line L through the first inductor L1, the first inductor S6 and the first inductor S8, and the energy storage stage of the first inductor L1 is completed. When S5 is on, S6 is off. The current flows from the live line L through the first inductors L1 and S5, the capacitor C1 and the load, and then flows into the zero line N through the capacitor S8, thereby completing the energy release stage of the first inductor L1. Similarly, when the voltage of the alternating current power supply AC is in a negative half cycle, that is, the voltage of the zero line N is greater than the voltage of the live line L, S7 is in an on state, and S8 is in an off state. In this example, the driving module 10 is replaced by an integrated IC11, and a comparator is added to the circuit, which is not required in practical application. Wherein, S5 and S6 may be high frequency switching tubes, such as GaN tubes, and S5, S6, S7 and S8 may also be MOS tubes. The capacitor C0 is connected in parallel with the first resistor R1, and can compensate for the phase lag of the voltage caused by the driving module 10.
Fig. 3 is another bridgeless PFC circuit according to an embodiment of the present disclosure, and fig. 3 shows another topology of the bridgeless PFC circuit. The power frequency switching device comprises a third high-frequency switching tube S9, a fourth high-frequency switching tube S10, a third power frequency switching tube S11 and a fourth power frequency switching tube S12. The live wire L of the alternating current power supply AC is connected with the third high-frequency switch tube S9 through the second inductor L2, the zero wire N of the alternating current power supply AC is connected with the fourth high-frequency switch tube S10 through the third inductor L3, the live wire L is also connected with the third power frequency switch tube S11, and the zero wire N is also connected with the fourth power frequency switch tube S12. The phase compensation sampling circuit is connected with a live line L and a zero line N of an alternating current power supply AC, samples the output voltage of the alternating current power supply AC, outputs a voltage sampling signal to the driving module 10, and the driving module 10 outputs a driving voltage or current to control the on and off of S11 and S12. The phase compensation sampling circuit includes a first resistor R1, a second resistor R2, and a capacitor C0, and the connection relationship is shown in fig. 3. The first resistor R1 is connected with the second resistor R2 in series, wherein the first end of the first resistor R1 is used as the first end of the phase compensation sampling circuit and is connected with a live wire or a zero wire; the second end of the second resistor R2 is used as the second end of the phase compensation sampling circuit, and is connected to the output negative terminal (the output negative terminal is represented by a ground symbol in the figure) of the active rectifying circuit, the capacitor C0 is connected in parallel with the first resistor R1, and the output end of the capacitor C0 is the common end of the first resistor R1 and the second resistor R2 and is used for connecting the driving module 10.
In the circuit configurations of fig. 1, 2, and 3, each of the first resistor R1 and the second resistor R2 may be a plurality of resistors; when the first resistor R1 is plural, the capacitor C0 may be connected in parallel with all or part of the first resistor R1. Fig. 4 is a schematic diagram of a capacitor connected in parallel with a first resistor according to an embodiment of the present disclosure; as shown in fig. 4, the first resistor R1 includes two resistors, and the capacitor C0 is connected in parallel with only one of the two resistors. FIG. 5 is a schematic diagram of another capacitor connected in parallel with a first resistor according to an embodiment of the present disclosure; as shown in fig. 5, the first resistor R1 also includes two resistors, but the capacitor C0 is connected in parallel with the two resistors. The cases of fig. 4 and 5 are merely examples in the present application, and the specific number and resistance values of the first resistor R1 and the second resistor R2 are not limited. In practical applications, the capacitance values of the capacitor C0 are different, and the generated compensation effects are also different, so that the size of the capacitor C0 needs to be matched with the delay time of the driving module.
Fig. 6 is a voltage waveform diagram corresponding to the conventional sampling circuit, as shown in fig. 6, where V1 is an input voltage of an AC power supply AC, V2 and V4 are output voltages of two sampling circuits, respectively, and V3 and V5 are driving voltages of a driving module. It can be seen that V3 and V5 lag behind the voltage of the AC power source AC. Fig. 7 is a voltage waveform diagram corresponding to the sampling circuit provided in the embodiment of the present application, and as shown in fig. 7, after sampling by using the phase compensation sampling circuit provided in the present application, there is no lag between V3 and V5 compared with the voltage of the AC power supply AC.
The phase compensation sampling circuit provided by the embodiment of the application is applied to an active rectification circuit or a bridgeless PFC circuit, wherein the active rectification circuit or the bridgeless PFC circuit at least comprises two switching tubes working in a power frequency state; the phase compensation sampling circuit includes: the first sampling circuit and the second sampling circuit; the first sampling circuit and the second sampling circuit each include: the circuit comprises a capacitor, a first resistor and a second resistor; the first end of each first resistor is respectively connected with a zero line and a live wire of an alternating current power supply of the active rectifying circuit or the bridgeless PFC circuit; the second end of each first resistor is respectively connected with the first end of a second resistor of the sampling circuit, and the second end of each second resistor is grounded; the second end of each first resistor is connected with a driving module of the active rectifying circuit or the bridgeless PFC circuit and used for inputting the acquired voltage sampling signal to the driving module; the driving module is connected with a switching tube of the active rectifying circuit or the bridgeless PFC circuit and is used for controlling the switching-on and switching-off of the switching tube according to the voltage sampling signal; the first resistor is provided with a resistor which is connected with the capacitor of the same sampling circuit in parallel. The capacitor can compensate the lagging alternating voltage, so that the synchronous rectifier tube can be synchronously switched on or off with the alternating current power supply without phase difference, and the loss of devices is avoided.
In order to solve the above technical problem, an active rectifier circuit according to an embodiment of the present application includes the phase compensation sampling circuit in the above embodiment.
Since the embodiment of the active rectifier circuit portion corresponds to the embodiment of the phase compensation sampling circuit portion, please refer to the description of the embodiment of the phase compensation sampling circuit portion for the embodiment of the active rectifier circuit portion, and the description thereof is omitted here for brevity.
The active rectifying circuit provided by the embodiment corresponds to the phase compensation sampling circuit, and therefore has the same beneficial effects as the phase compensation sampling circuit.
The phase compensation sampling circuit provided by the present application is described in detail above. The embodiments are described in a progressive mode in the specification, the emphasis of each embodiment is on the difference from the other embodiments, and the same and similar parts among the embodiments can be referred to each other. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one of 8230, and" comprising 8230does not exclude the presence of additional identical elements in a process, method, article, or apparatus comprising the same element.
Claims (9)
1. The phase compensation sampling circuit is characterized by being applied to an active rectifying circuit or a bridgeless PFC circuit, wherein the active rectifying circuit or the bridgeless PFC circuit at least comprises two switching tubes working in a power frequency state; the phase compensated sampling circuit comprises: the sampling circuit comprises a first sampling circuit and a second sampling circuit; the first sampling circuit and the second sampling circuit each include: the circuit comprises a capacitor, a first resistor and a second resistor;
the first end of each first resistor is respectively connected with a zero line and a live wire of an alternating current power supply of the active rectifying circuit or the bridgeless PFC circuit;
the second end of each first resistor is respectively connected with the first end of the second resistor of the sampling circuit, and the second end of each second resistor is grounded;
the second end of each first resistor is connected with a driving module (10) of the active rectifying circuit or the bridgeless PFC circuit and used for inputting the acquired voltage sampling signal to the driving module (10);
the driving module (10) is connected with a switching tube of the active rectifying circuit or the bridgeless PFC circuit and is used for controlling the switching tube to be switched on and off according to the voltage sampling signal;
the first resistor is provided with a resistor which is connected with the capacitor of the sampling circuit in parallel, and the capacitor and the second resistor of the sampling circuit in series are connected between the alternating current power supply and the ground.
2. The phase compensated sampling circuit of claim 1, wherein the active rectification circuit comprises: the rectifier comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, wherein each switching tube forms a rectifier bridge;
and the alternating current power supply is connected with the load through the rectifier bridge and is used for providing direct current for the load according to the on and off of each switching tube.
3. The phase compensation sampling circuit of claim 2, wherein each switching tube is a Mos tube.
4. The phase compensated sampling circuit of claim 1, wherein the bridgeless PFC circuit comprises: the first inductor, the two high-frequency switch tubes and the two power-frequency switch tubes; the two high-frequency switch tubes comprise a first high-frequency switch tube and a second high-frequency switch tube, and the two power frequency switch tubes comprise a first power frequency switch tube and a second power frequency switch tube;
the live wire of the alternating current power supply is connected with the two high-frequency switch tubes through the first inductor, and the zero line of the alternating current power supply is connected with the two power frequency switch tubes;
the driving module (10) is respectively connected with the two power frequency switch tubes and is used for controlling the on-off of each power frequency switch tube according to the voltage sampling signal;
and the alternating current power supply is connected with the load through each switching tube and is used for providing direct current for the load according to the on and off of the two power frequency switching tubes.
5. The phase compensated sampling circuit of claim 1, wherein the bridgeless PFC circuit comprises: the second inductor, the third high-frequency switching tube, the fourth high-frequency switching tube, the third power frequency switching tube, the fourth power frequency switching tube, the first diode and the second diode;
the live wire of the alternating current power supply is connected with the third power frequency switching tube and is also connected with the third high frequency switching tube and the first diode through the second inductor; the zero line of the alternating current power supply is connected with the fourth power frequency switching tube and is also connected with the fourth high-frequency switching tube and the second diode through the third inductor;
the driving module (10) is respectively connected with the third power frequency switching tube and the fourth power frequency switching tube and is used for controlling the third power frequency switching tube and the fourth power frequency switching tube to be switched on and off according to the voltage sampling signal;
and the alternating current power supply is connected with the load through each switching tube and each diode and is used for providing direct current for the load according to the on and off of the third power frequency switching tube and the fourth power frequency switching tube.
6. The phase compensation sampling circuit of claim 4 or 5, wherein each power frequency switch tube is a Mos tube, and each high frequency switch tube is a GaN tube.
7. The phase compensation sampling circuit of claim 4 or 5, wherein each switch tube is a Mos tube.
8. The phase compensated sampling circuit of claim 1, wherein the driving circuit of the active rectification circuit or the bridgeless PFC circuit is an integrated IC (11).
9. The phase compensated sampling circuit of claim 8, wherein the active rectification circuit or the bridgeless PFC circuit further comprises: a comparator; the output end of the phase compensation sampling circuit is connected with the inverting input end of the comparator, the output end of the comparator is connected with the integrated IC (11), and the non-inverting input end of the comparator is connected with a reference voltage; the integrated IC (11) drives the switching tube according to the output signal of the comparator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221288987.8U CN217931786U (en) | 2022-05-26 | 2022-05-26 | Phase compensation sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221288987.8U CN217931786U (en) | 2022-05-26 | 2022-05-26 | Phase compensation sampling circuit |
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| CN217931786U true CN217931786U (en) | 2022-11-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115580960A (en) * | 2022-12-07 | 2023-01-06 | 深圳市朗文科技实业有限公司 | LED drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115580960A (en) * | 2022-12-07 | 2023-01-06 | 深圳市朗文科技实业有限公司 | LED drive circuit |
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