CN106602896B - Totem-pole bridgeless circuit and totem-pole bridgeless circuit system - Google Patents
Totem-pole bridgeless circuit and totem-pole bridgeless circuit system Download PDFInfo
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- CN106602896B CN106602896B CN201611159938.3A CN201611159938A CN106602896B CN 106602896 B CN106602896 B CN 106602896B CN 201611159938 A CN201611159938 A CN 201611159938A CN 106602896 B CN106602896 B CN 106602896B
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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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
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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 invention relates to the technical field of current sampling, in particular to a totem-pole bridgeless circuit and a totem-pole bridgeless circuit system. The totem-pole bridgeless circuit comprises a first current transformer circuit, a second current transformer circuit and a sampling resistor. The first current transformer circuit is connected between the first parallel connection point and the second series connection point. The second current transformer circuit is connected between the second parallel connection point and the second series connection point. And when the first switching tube is disconnected, the second current transformer circuit collects the first current flowing through the second switching tube. When the first switch tube is closed, the first current transformer circuit collects the second current flowing through the first switch tube. Therefore, the current can be collected without adopting a large-size and expensive Hall sensor, so that the cost and the size of the product are reduced.
Description
Technical Field
The invention relates to the technical field of current sampling, in particular to a totem-pole bridgeless circuit and a totem-pole bridgeless circuit system.
Background
In energy conversion systems, the conversion efficiency of the power source is very important. Wide bandgap power semiconductors, such as gallium nitride (GaN) and silicon carbide (SiC), have recently gained increasing favor for power conversion applications due to their excellent switching characteristics and ever-increasing quality. Owing to the advantages of gallium nitride and silicon carbide, a Totem-Pole bridge-less (Totem-Pole bridge) circuit, which is one of the Bridgeless circuits, has the advantages of simple circuit structure, high conversion efficiency and the like, and is increasingly commonly used in recent years.
In a totem-pole bridgeless circuit, one major challenge lies in sampling an inductor current to realize a control timing sequence of a switching tube, so as to realize functions such as power factor correction and the like. As shown in fig. 1, the conventional sampling method is to directly sample the inductor current through a hall sensor and transmit the sampled inductor current to a control unit. However, the hall sensor is large in size and expensive, so that the size of the totem-pole bridgeless circuit is too large, and the application range of the circuit is made.
Disclosure of Invention
The embodiment of the invention aims to provide a totem-pole bridgeless circuit and a totem-pole bridgeless circuit system, which solve the technical problem that the conventional totem-pole bridgeless circuit is overlarge in size.
In order to solve the above technical problems, embodiments of the present invention provide the following technical solutions:
in a first aspect, an embodiment of the present invention provides a totem-pole bridgeless circuit, including a first bridge arm unit and a second bridge arm unit connected in parallel between a first parallel connection point and a second parallel connection point, where the first bridge arm unit includes a first switch tube and a second switch tube connected in series in the same direction, a connection point between the first switch tube and the second switch tube is a first series connection point, the second bridge arm unit includes a first diode and a second diode connected in series in the same direction, a connection point between the first diode and the second diode is a second series connection point, a load unit is further connected in parallel between the first parallel connection point and the second parallel connection point, a power supply and an inductor are further connected between the first series connection point and the second series connection point, the power supply and the inductor are connected in series, and the totem-pole bridgeless circuit further includes a first current transformer circuit, a second current transformer circuit, and a sampling resistor; the first current transformer circuit is connected between the first parallel connection point and the first series connection point and is connected with the first switch tube in series; the second current transformer circuit is connected between the second parallel connection point and the first series connection point and is connected with the second switch tube in series; the output end of the first current transformer circuit and the output end of the second current transformer circuit share a first connecting point, one end of the sampling resistor is connected with the first connecting point, and the other end of the sampling resistor is grounded; when the power supply works in the positive half cycle of alternating current, the first current transformer circuit does not sample the current flowing through the inductor, and when the second switch tube is closed and the first switch tube is opened, the second current transformer circuit is used for collecting the first current flowing through the second switch tube and enabling the collected current to flow through the sampling resistor; when the power supply works on the negative half cycle of alternating current, the second current transformer circuit does not sample the current flowing through the inductor, and when the second switch tube is switched off and the first switch tube is switched on, the first current transformer circuit is used for collecting the second current flowing through the first switch tube and enabling the collected current to flow through the sampling resistor.
Optionally, the totem-pole bridgeless circuit further includes a third current transformer circuit connected between the first parallel connection point and the second parallel connection point, an output end of the third current transformer circuit sharing the first connection point; when the power supply works in the positive half cycle of the alternating current, the second switch tube is disconnected, and the first switch tube is closed, or when the power supply works in the negative half cycle of the alternating current, the second switch tube is closed, and the first switch tube is disconnected, the third current transformer circuit is used for collecting the current flowing through the load unit, and enabling the collected current to flow through the sampling resistor.
Optionally, the first current transformer circuit includes a first current transformer, a first reset resistor, a third diode, and a first sampling switch; the first sampling switch comprises a first input end, a first output end and a first control end; the first current transformer comprises a first primary winding and a first secondary winding, the first primary winding is connected between the first parallel connection point and the first series connection point, one end of the first secondary winding is respectively connected with one end of the first reset resistor and the anode of the first diode, the other end of the first reset resistor is grounded, the cathode of the third diode is connected with the first input end of the first sampling switch, the first output end of the first sampling switch is the first connection point, and the first control end is used for inputting a first control signal; when the power supply works in the positive half cycle of alternating current, the first control signal controls the first sampling switch to be in an off state; when the power supply works in the negative half cycle of the alternating current, the first control signal controls the first sampling switch to be in a closed state.
Optionally, the second current transformer circuit includes a second current transformer, a second reset resistor, a fourth diode, and a second sampling switch; the second sampling switch comprises a second input end, a second output end and a second control end; the second current transformer comprises a second primary winding and a second secondary winding, the second primary winding is connected between the second parallel connection point and the first series connection point, one end of the second secondary winding is respectively connected with one end of the second reset resistor and the anode of the fourth diode, the other end of the second reset resistor is grounded, the cathode of the fourth diode is connected with the second input end of the second sampling switch, the second output end of the second sampling switch is the first connection point, and the second control end is used for inputting a second control signal; when the power supply works in the positive half cycle of the alternating current, the second control signal controls the second sampling switch to be in a closed state; when the power supply works in the negative half cycle of the alternating current, the second control signal controls the second sampling switch to be in an off state.
Optionally, the first current transformer circuit includes a third current transformer, a third reset resistor, a fifth diode, and a third sampling switch; the third sampling switch comprises a third input end, a third output end and a third control end; the third current transformer comprises a third primary winding and a third secondary winding, the third primary winding is connected between the first parallel connection point and the first serial connection point, one end of the third secondary winding is respectively connected with one end of a third reset resistor, the anode of a fifth diode and a third input end of a third sampling switch, the other end of the third reset resistor is grounded, the cathode of the fifth diode is connected with the first connection point, a third output end of the third sampling switch is grounded, and a third control end is used for inputting a third control signal; when the power supply works in the positive half cycle of the alternating current, the third control signal controls the third sampling switch to be in a closed state; when the power supply works in the negative half cycle of the alternating current, the third control signal controls the third sampling switch to be in an off state.
Optionally, the first current transformer circuit further comprises a sixth diode; the third sampling switch is a first N-channel insulated gate field effect transistor, a drain electrode of the first N-channel insulated gate field effect transistor is the third input end, a source electrode is the third output end, and a gate electrode is the third control end; the anode of the sixth diode is connected with the anode of the fifth diode, the cathode of the sixth diode is connected with the drain electrode of the first N-channel insulated gate field effect transistor, and the source electrode of the sixth diode is grounded.
Optionally, the second current transformer circuit includes a fourth current transformer, a fourth reset resistor, a seventh diode, and a fourth sampling switch; the fourth sampling switch comprises a fourth input end, a fourth output end and a fourth control end; the second current transformer comprises a fourth primary winding and a fourth secondary winding, the fourth primary winding is connected between the second parallel connection point and the first serial connection point, one end of the fourth secondary winding is respectively connected with one end of a fourth reset resistor, the anode of a seventh diode and the fourth input end of a fourth sampling switch, the other end of the fourth reset resistor is grounded, the cathode of the seventh diode is connected with the first connection point, the fourth output end of the fourth sampling switch is grounded, and the fourth control end is used for inputting a fourth control signal; when the power supply works in the positive half cycle of the alternating current, the fourth control signal controls the fourth sampling switch to be in an off state; when the power supply works in the negative half cycle of the alternating current, the fourth control signal controls the fourth sampling switch to be in a closed state.
Optionally, the second current transformer circuit further comprises an eighth diode; the fourth sampling switch is a second N-channel insulated gate field effect transistor, a drain electrode of the second N-channel insulated gate field effect transistor is the fourth input end, a source electrode is the fourth output end, and a gate electrode is the fourth control end; the anode of the eighth diode is connected with the anode of the seventh diode, the cathode of the eighth diode is connected with the drain of the second N-channel insulated gate field effect transistor, and the source is grounded.
Optionally, the third current transformer circuit includes a fifth current transformer, a fifth reset resistor, and a ninth diode; the fifth current transformer comprises a fifth primary winding and a fifth secondary winding, the fifth primary winding is connected between the first parallel connection point and the second parallel connection point, one end of the fifth secondary winding is connected with one end of a fifth reset resistor and the anode of the ninth diode respectively, the other end of the fifth reset resistor is grounded, and the cathode of the ninth diode is connected with the first connection point.
In a second aspect, an embodiment of the present invention provides a totem-pole bridgeless circuit system, where the totem-pole bridgeless circuit system includes the totem-pole bridgeless circuit described above, and further includes a control unit; the control unit comprises a fifth control end, a sixth control end, a seventh control end, a first control output end, a second control output end, a third control output end and a fourth control output end, wherein the fifth control end is used for sampling voltages at two ends of the power supply, the sixth control end is connected with the first connecting point and is used for sampling voltages at two ends of the sampling resistor, the seventh control end is connected with the input end of the load unit and is used for sampling the output voltage of the totem pole bridgeless circuit, the first control output end is connected with the first current transformer circuit, the second control output end is connected with the second current transformer circuit, the third control output end is connected with the first switch tube, and the fourth control output end is connected with the second switch tube; the control unit controls the working states of the first current transformer circuit, the second current transformer circuit, the first switch tube and the second switch tube according to the sampled voltages at the two ends of the power supply, the sampled voltages at the two ends of the resistor and the output voltage of the totem-pole bridgeless circuit.
Optionally, the totem-pole bridgeless circuit further includes a third current transformer circuit connected between the first parallel connection point and the second parallel connection point, and output ends of the third current transformer circuit share the first connection point; when the power supply works in the positive half cycle of alternating current, the second switch tube is opened and the first switch tube is closed, or when the power supply works in the negative half cycle of alternating current, the second switch tube is closed and the first switch tube is opened, the third current transformer circuit is used for collecting the current flowing through the load unit and enabling the collected current to flow through the sampling resistor.
In various embodiments of the present invention, when the power supply operates on the positive half cycle of the alternating current, the first current transformer circuit does not sample the current flowing through the inductor, and when the second switch tube is closed and the first switch tube is open, the second current transformer circuit samples the first current flowing through the second switch tube and causes the sampled current to flow through the sampling resistor. When the power supply works in the negative half cycle of the alternating current, the second current transformer circuit does not sample the current flowing through the inductor, and when the second switch tube is switched off and the first switch tube is switched on, the first current transformer circuit samples the second current flowing through the first switch tube and enables the collected current to flow through the sampling resistor. Therefore, the current can be collected without adopting a large-size and expensive Hall sensor, so that the cost and the size of the product are reduced.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of a circuit structure of a totem-pole bridgeless circuit provided in the prior art;
fig. 2 is a schematic circuit diagram of a totem-pole bridgeless circuit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a totem-pole bridgeless circuit according to another embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a totem-pole bridgeless circuit according to another embodiment of the present invention;
FIG. 5 is a timing diagram of a totem-pole bridgeless circuit according to an embodiment of the present invention;
fig. 5a to fig. 5d are schematic diagrams illustrating an operating state of a totem-pole bridgeless circuit according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a totem-pole bridgeless circuit according to another embodiment of the present invention;
FIG. 7a is a schematic diagram of the circuit configuration of the first current transformer circuit of FIG. 4 according to another embodiment of the present invention;
FIG. 7b is a schematic diagram of the circuit configuration of the second current transformer circuit of FIG. 4 according to another embodiment of the present invention;
FIG. 8a is a schematic diagram of the circuit configuration of the first current transformer circuit of FIG. 6 according to another embodiment of the present invention;
FIG. 8b is a schematic diagram of the circuit configuration of the second current transformer circuit of FIG. 6 according to another embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a totem-pole bridgeless circuit system according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of another totem-pole bridgeless circuit system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another totem-pole bridgeless circuit system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 2 is a schematic circuit diagram of a totem-pole bridgeless circuit according to an embodiment of the present invention. As shown in fig. 2, the totem-pole bridgeless circuit 10 includes a first bridge arm unit 101, a second bridge arm unit 102, a first current transformer circuit 103, a second current transformer circuit 104, and a sampling resistor RS. First bridge arm unit 101 and second bridge arm unit 102 are connected in parallel between first parallel connection point 51 and second parallel connection point 52, first bridge arm unit 101 includes first switch tube Q1 and second switch tube Q2 connected in series in the same direction, the connection point between first switch tube Q1 and second switch tube Q2 is first series connection point 61, second bridge arm unit 102 includes first diode D1 and second diode D2 connected in series in the same direction, the connection point between first diode D1 and second diode D2 is second series connection point 62, first parallel connection point 51 and second parallel connection point 52 are also used for connecting load unit 70 in parallel, first series connection point 61 and second series connection point 62 are also used for connecting power supply AC1 and inductance L1, and power supply AC1 and inductance L1 are connected in series.
The first current transformer circuit 103 is connected between the first parallel connection point 51 and the first series connection point 61, and is connected in series with the first switching tube Q1.
The second current transformer circuit 104 is connected between the second parallel connection point 52 and the first series connection point 61, and is connected in series with the second switching tube Q2.
The output terminal 1031 of the first current transformer circuit 103 and the output terminal 1041 of the second current transformer circuit 104 share the first connection point 10A, one end of the sampling resistor RS is connected to the first connection point 10A, and the other end is grounded.
When the power supply AC1 operates in the positive half cycle of the alternating current, the second switching tube Q2 is closed, and the first switching tube Q1 is opened, the second current transformer circuit 104 collects the first current I10 flowing through the second switching tube Q2, and makes the collected current I11 flow through the sampling resistor RS. For example, a high level indicates that the second switch Q2 is closed, a low level indicates that the second switch Q2 is open, the second switch Q2 is closed after receiving the high level, the primary winding of the second current transformer circuit 104 collects the first current I10 flowing through the second switch Q2, and outputs the collected current I11 at the secondary winding, and makes the collected current I11 flow through the sampling resistor RS, and at this time, the external control unit analyzes the first current I10 by sampling the voltage Vcs across the sampling resistor RS, because the first current I10 is equal to the inductor current I flowing through the inductor L1 L Therefore, the inductive current I of the power supply AC1 working in the positive half cycle of the alternating current can be collected L . During operation of the power supply AC1 in the positive half cycle of the alternating current, the first current transformer circuit does not sample the current flowing through the inductor L1.
When the power supply AC1 works in the negative half cycle of the alternating current, the second switch tubeWhen Q2 is turned off and the first switching tube Q1 is closed, the first current transformer circuit 103 collects the second current I20 flowing through the first switching tube Q1 and causes the collected current I21 to flow through the sampling resistor RS. Similarly, the first current transformer circuit 103 may collect the inductive current I when the power AC1 operates in the negative half cycle of the alternating current L . During operation of the power supply AC1 in the negative half cycle of the alternating current, the second current transformer circuit does not sample the current flowing through the inductor L1.
In the embodiment, the totem-pole bridgeless circuit can realize the collection of the current without adopting a large-volume and expensive Hall sensor, thereby reducing the cost and the volume of the product.
In some embodiments, the first switch Q1 or the second switch Q2 may be an insulated gate field effect transistor MOSFET or an insulated gate bipolar transistor IGBT or a bipolar transistor.
In some embodiments, as shown in fig. 3, the totem-pole bridgeless circuit 10 further includes a third current transformer circuit 105 connected between the first parallel connection point 51 and the second parallel connection point 52, with the output 1051 of the third current transformer circuit 105 sharing the first connection point 10A.
The third current transformer circuit 105 collects the current I flowing through the load unit 70 when the power supply AC1 operates in the positive half cycle of the alternating current, the second switching tube Q2 is open and the first switching tube Q1 is closed, or when the power supply AC1 operates in the negative half cycle of the alternating current, the second switching tube Q2 is closed and the first switching tube Q1 is open RL And the collected current I is used 1 Flows through the sampling resistor. Therefore, in the positive half cycle or the negative half cycle of the alternating current, the first switch tube Q1 and the second switch tube Q2 work in a complementary on state, so that each current transformer circuit is flexibly adjusted to realize current sampling.
In some embodiments, as shown in fig. 4, the first current transformer circuit 103 includes a first current transformer CT1, a first reset resistor R1, a third diode D3, and a first sampling switch S1. The first sampling switch S1 includes a first input terminal 1a, a first output terminal 1b and a first control terminal 1c. The first current transformer CT1 includes a first primary winding and a first secondary winding, the first primary winding is connected between the first parallel connection point 51 and the first series connection point 61, one end of the first secondary winding is connected to one end of the first reset resistor R1 and the anode of the third diode D3, the other end of the first reset resistor R1 is grounded, the cathode of the third diode D3 is connected to the first input end 1a of the first sampling switch S1, the first output end 1b of the first sampling switch S1 is the first connection point 10A, and the first control end 1c is used for inputting the first control signal CS1_ EN.
Please refer to fig. 4. The second current transformer circuit 104 includes a second current transformer CT2, a second reset resistor R2, a fourth diode D4, and a second sampling switch S2. The second sampling switch S2 includes a second input terminal 2a, a second output terminal 2b and a second control terminal 2c. The second current transformer CT2 includes a second primary winding and a second secondary winding, the second primary winding is connected between the second parallel connection point 52 and the first series connection point 61, one end of the second secondary winding is connected to one end of the second reset resistor R2 and the anode of the fourth diode D4, the other end of the second reset resistor R2 is grounded, the cathode of the fourth diode D4 is connected to the second input end 2a of the second sampling switch S2, the second output end 2b of the second sampling switch S2 is the first connection point 10A, and the second control end 2c is used for inputting the second control signal CS2_ EN.
Please refer to fig. 4. The third current transformer circuit 105 includes a fifth current transformer CT5, a fifth reset resistor R5, and a ninth diode D9. The fifth current transformer CT5 includes a fifth primary winding and a fifth secondary winding, the fifth primary winding is connected between the first parallel connection point 51 and the second parallel connection point 52, one end of the fifth secondary winding is connected to one end of the fifth reset resistor R5 and the anode of the ninth diode D9, the other end of the fifth reset resistor R5 is grounded, and the cathode of the ninth diode D9 is connected to the first connection point 10A.
When the power supply AC1 operates on the positive half cycle of the alternating current, the first control signal CS1_ EN controls the first sampling switch S1 to be in the off state. When the power supply AC1 operates in the negative half cycle of the alternating current, the first control signal CS1_ EN controls the first sampling switch S1 to be in the closed state. When the power supply AC1 operates on the positive half cycle of the alternating current, the second control signal CS2_ EN controls the second sampling switch S2 to be in the closed state. When the power supply AC1 operates at the negative half cycle of the alternating current, the second control signal CS2_ EN controls the second sampling switch S2 to be in the off state.
The working principle of the totem-pole bridgeless circuit in the embodiment of the invention is as follows:
please refer to fig. 5 and 5a together. When the power supply AC1 inputs positive half cycles of alternating current: the second switch tube Q2 is an active tube, and the first switch tube Q1 is a follow current tube and works in a complementary on state. When G is S1 Is at a low level, G S2 When the voltage is high, the first sampling switch S1 is turned off, the second sampling switch S2 is turned on, and the first current transformer circuit 103 is in an off state.
Please refer to fig. 5 and 5a together. When G is Q2 Is high level, G Q1 When the voltage is low, the second switching tube Q2 is closed, and the first switching tube Q1 is opened. The current flows to the inductor L1, the second transformer CT2, the second switch tube Q2 and the fourth switch tube Q4 through the positive end of the power supply AC1 and then flows back to the negative end of the power supply AC 1. The inductor L1 works in an energy storage state, and the power supply AC1 stores energy to the inductor L1. The primary winding of the second current transformer CT2 flows forward current, and the secondary winding of the second current transformer CT2 also flows forward current I Q2 . A secondary winding of the second current transformer CT2, a second diode D2 and a second sampling switch S2 form a rectification loop for collecting forward current I Q2 . At this time, the first switching tube Q1 is turned off. No current flows through the primary winding of the third current transformer CT3, and the secondary winding of the third current transformer CT3 and the third reset resistor R3 form a reset loop. At the same time, the load capacitor C1 of the load unit 70 discharges the load resistance RL. The voltage Vcs across the sampling resistor RS is shown in fig. 5.
Please refer to fig. 5 and 5b. When G is Q2 Is low level, G Q1 When the current is high level, the second switch tube Q2 is disconnected, and when the first switch tube Q1 is closed, no current flows through the primary winding of the second current transformer CT2, and the secondary winding of the second current transformer CT2 and the second reset resistor R2 form a reset loop. At this time, the first switch tube Q1 is closed, and electricity is suppliedThe current flows to the inductor L1, the first switching tube Q1, the first current transformer CT1, the third current transformer CT5, the load unit 70, and the fourth switching tube S4 through the positive end of the AC and then flows back to the negative end of the power supply AC 1. The inductor L1 works in an energy releasing state to release energy to the load unit, and the load capacitor works in a charging state. A forward current flows through the primary winding of the third current transformer CT5, and a forward current also flows through the secondary winding of the third current transformer CT 5. The secondary winding of the third current transformer CT5 and the fifth diode D3 form a rectification loop to collect a forward current signal.
When the power supply AC1 inputs negative half cycle of alternating current:
the first switch tube Q1 is an active tube, the second switch tube Q2 is a follow current tube, and the first switch tube Q1 and the second switch tube Q2 work in a complementary opening state. When G is S1 Is high level, G S2 When the voltage is at a low level, the first sampling switch S1 is turned on, the second sampling switch S2 is turned off, and the second current transformer circuit 104 is in an off state.
Please refer to fig. 5 and 5c. When G is Q2 Is at a low level, G Q1 When the voltage is high level, the first switch tube Q1 is closed, and the second switch tube Q2 is opened. The current flows to the third switching tube S3, the first transformer CT1, the first switching tube Q1 and the inductor L1 through the negative end of the power supply AC1 and then flows back to the positive end of the power supply AC 1. The inductor L1 works in an energy storage state, and the power supply AC1 stores energy to the inductor L1. The primary winding of the first current transformer CT1 flows forward current, and the secondary winding of the first current transformer CT1 also flows forward current I Q1 . Then the secondary winding of the first current transformer CT1, the first diode D1 and the first sampling switch S1 form a rectification loop to collect a forward current signal I Q1 . No current flows through the primary winding of the third current transformer CT5, and the secondary winding of the third current transformer CT5 and the third reset resistor R3 form a reset loop. At the same time, the load capacitor C1 discharges the load resistor RL.
Please refer to fig. 5 and 5d. When G is Q2 Is high level, G Q1 When the current is low level, the second switch tube Q2 is closed, when the first switch tube Q1 is disconnected, no current flows through the primary winding of the first current transformer CT1, and the first current transformerThe secondary winding of the CT1 and the first reset resistor R1 form a reset loop. At this time, the second switching tube Q2 is turned on, and the current flows to the third switching tube Q3, the third current transformer CT3, the load unit 70, the second switching tube Q2, the second transformer CT2, the inductor L1 through the negative end of the AC and then flows back to the positive end of the power supply AC 1. The inductor L1 works in an energy releasing state to release energy to the load unit, and the load capacitor C1 works in a charging state. A forward current flows through the primary winding of the third current transformer CT5, and a forward current also flows through the secondary winding of the third current transformer CT 5. And a secondary winding of the third current transformer CT3 and a seventh diode D7 form a rectification loop to acquire a forward current signal.
In some embodiments, as shown in fig. 6, the totem-pole bridgeless circuit shown in fig. 6 differs from the totem-pole bridgeless circuit shown in fig. 4 in that:
the first current transformer circuit 103 includes a third current transformer CT3, a third reset resistor R3, a fifth diode D5, and a third sampling switch S3. The third sampling switch S3 includes a third input terminal 3a, a third output terminal 3b and a third control terminal 3c. The third current transformer CT3 includes a third primary winding and a third secondary winding, the third primary winding is connected between the first parallel connection point 51 and the first serial connection point 61, one end of the third secondary winding is connected to one end of a third reset resistor R3, the anode of the fifth diode D5 and the third input terminal 3a of the third sampling switch S3, the other end of the third reset resistor R3 is grounded, the cathode of the fifth diode D5 is connected to the first connection point 10A, the third output terminal 3b of the third sampling switch S3 is grounded, and the third control terminal 3c is used for inputting a third control signal CS1_ DIS. When the power supply works on the positive half cycle of the alternating current, the third control signal CS1_ DIS controls the third sampling switch S3 to be in a closed state. When the power supply AC1 operates at the negative half cycle of the alternating current, the third control signal CS1_ DIS controls the third sampling switch S3 to be in the off state.
The second current transformer circuit 104 includes a fourth current transformer CT4, a fourth reset resistor R4, a seventh diode D7, and a fourth sampling switch S4. The fourth sampling switch S4 includes a fourth input terminal 4a, a fourth output terminal 4b and a fourth control terminal 4c. The second current transformer CT4 includes a fourth primary winding and a fourth secondary winding, the fourth primary winding is connected between the second parallel connection point 52 and the first serial connection point 61, one end of the fourth secondary winding is connected to one end of a fourth reset resistor R4, the anode of the seventh diode D7 and the fourth input terminal 4a of the fourth sampling switch S4, the other end of the fourth reset resistor R4 is grounded, the cathode of the seventh diode D7 is connected to the first connection point 10A, the fourth output terminal 4b of the fourth sampling switch S4 is grounded, and the fourth control terminal 4c is used for inputting the fourth control signal CS2_ DIS. When the power supply AC1 operates on the positive half cycle of the alternating current, the fourth control signal CS2_ DIS controls the fourth sampling switch S4 to be in the off state. When the power supply AC1 operates in the negative half cycle of the alternating current, the fourth control signal CS2_ DIS controls the fourth sampling switch S4 to be in a closed state.
In some embodiments, the sampling switch of the first current transformer circuit 103 or the second current transformer circuit 104 may also employ an insulated gate field effect transistor MOSFET or an insulated gate bipolar transistor IGBT or a bipolar transistor. As shown in fig. 7a and 7b, the first sampling switch S1 and the second sampling switch S2 are N-channel MOSFETs.
In some embodiments, as shown in fig. 8a, the totem-pole bridgeless circuit shown in fig. 8a differs from the totem-pole bridgeless circuit shown in fig. 6 in that:
the first current transformer circuit 103 further comprises a sixth diode D6. The third sampling switch S3 is a first N-channel insulated gate field effect transistor, a drain of the first N-channel insulated gate field effect transistor is a third input terminal 3a, a source is a third output terminal 3b, and a gate is a third control terminal 3c. The anode of the sixth diode D6 is connected with the anode of the fifth diode D5, the cathode of the sixth diode D6 is connected with the drain electrode of the first N-channel insulated gate field effect transistor, and the source electrode is grounded.
As shown in fig. 8b, the second current transformer circuit 104 further comprises an eighth diode D8. The fourth sampling switch S4 is a second N-channel insulated gate field effect transistor, a drain of the second N-channel insulated gate field effect transistor is a fourth input terminal 4a, a source is a fourth output terminal 4b, and a gate is a fourth control terminal 4c. The anode of the eighth diode D8 is connected with the anode of the seventh diode D7, the cathode of the eighth diode D8 is connected with the drain of the second N-channel insulated gate field effect transistor, and the source is grounded.
In some embodiments, as shown in fig. 4, the polarities of the third diode D3, the fourth diode D4, and the ninth diode D9 may be reversed, and the polarities of the terminals with the same name of the first current transformer CT1, the second current transformer CT2, and the third current transformer CT5 are reversed, so as to obtain a negative current on the sampling resistor RS, and then, the negative current is converted into a forward circuit through the inverter circuit, so as to detect the voltage across the sampling resistor RS and further obtain an inductor current.
As another aspect of the embodiments of the present invention, a totem-pole bridgeless circuit system is provided in the embodiments of the present invention. Fig. 9 is a schematic structural diagram of a totem-pole bridgeless circuit system according to an embodiment of the present invention. As shown in fig. 9, the totem-pole bridgeless circuit system 90 includes the totem-pole bridgeless circuit 10 and the control unit 20 described above. The control unit 20 includes a fifth control terminal Vac, a sixth control terminal Vcs, a seventh control terminal Vout, a first control output terminal CS1_ EN, a second control output terminal CS2_ EN, a third control output terminal GATE _ Q1, and a fourth control output terminal GATE _ Q2. The fifth control terminal Vac is used for sampling the voltages at the two ends of the power source AC1, wherein before the voltages at the two ends of the power source AC1 are input into the control unit 20 through the fifth control terminal Vac, the voltages at the two ends of the power source AC1 may be subjected to signal processing to make the voltages meet the desired output voltage signal, and the voltage signal is loaded to the fifth control terminal Vac. The sixth control terminal Vcs is connected with the first connection point 10A and is used for sampling the voltage at two ends of the sampling resistor RS, the seventh control terminal Vout is connected with the input terminal 701 of the load unit 70 and is used for sampling the output voltage of the totem-pole bridgeless circuit 10, the first control output terminal CS1_ EN is connected with the first current transformer circuit 103, the second control output terminal CS2_ EN is connected with the second current transformer circuit 104, the third control output terminal GATE _ Q1 is connected with the first switch tube Q1, and the fourth control output terminal GATE _ Q2 is connected with the second switch tube Q2.
The control unit 20 controls the working states of the first current transformer circuit 103, the second current transformer circuit 104, the first switch tube Q1 and the second switch tube Q2 according to the sampled voltages across the power supply AC1, the sampled voltage across the resistor RS and the output voltage of the totem-pole bridgeless circuit 10.
The control unit 20 may be implemented by a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
In the embodiment, because a hall sensor which is large in size and expensive is not required, the totem-pole bridgeless circuit system of the embodiment can acquire current, so that the cost and the size of a product are reduced.
In some embodiments, as shown in fig. 10 and 11, the totem-pole bridgeless circuit 10 further includes a third current transformer circuit 105 connected between the first parallel connection point 51 and the second parallel connection point 52, an output of the third current transformer circuit 105 sharing the first connection point 10A. The third current transformer circuit 105 is configured to collect the current flowing through the load unit 70 when the power supply AC1 operates in the positive half cycle of the alternating current, the second switching tube Q2 is open, and the first switching tube Q1 is closed, or when the power supply AC1 operates in the negative half cycle of the alternating current, the second switching tube Q2 is closed, and the first switching tube Q1 is open, and to make the collected current flow through the sampling resistor RS.
Since the totem-pole bridgeless circuit 10 of the totem-pole bridgeless circuit system 90 is based on the concept of the totem-pole bridgeless circuit shown in fig. 1 to 8, the totem-pole bridgeless circuit 10 of the totem-pole bridgeless circuit system 90 can be introduced with the totem-pole bridgeless circuit shown in fig. 1 to 8 on the premise that the contents do not conflict with each other, which is not described herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A totem-pole bridgeless circuit comprises a first bridge arm unit and a second bridge arm unit which are connected in parallel between a first parallel connection point and a second parallel connection point, wherein the first bridge arm unit comprises a first switch tube and a second switch tube which are connected in series in the same direction, the connection point between the first switch tube and the second switch tube is a first series connection point, the second bridge arm unit comprises a first diode and a second diode which are connected in series in the same direction, the connection point between the first diode and the second diode is a second series connection point, a load unit is connected in parallel between the first parallel connection point and the second parallel connection point, a power supply and an inductor are connected in series between the first series connection point and the second series connection point, and the power supply and the inductor are connected in series,
the totem-pole bridgeless circuit also comprises a first current transformer circuit, a second current transformer circuit and a sampling resistor;
the first current transformer circuit is connected between the first parallel connection point and the first series connection point and is connected with the first switch tube in series;
the second current transformer circuit is connected between the second parallel connection point and the first series connection point and is connected with the second switch tube in series;
the output end of the first current transformer circuit and the output end of the second current transformer circuit share a first connecting point, one end of the sampling resistor is connected with the first connecting point, and the other end of the sampling resistor is grounded;
when the power supply works in the positive half cycle of alternating current, the first current transformer circuit does not sample the current flowing through the inductor, and when the second switch tube is closed and the first switch tube is opened, the second current transformer circuit is used for collecting the first current flowing through the second switch tube and enabling the collected current to flow through the sampling resistor;
when the power supply works on the negative half cycle of alternating current, the second current transformer circuit does not sample the current flowing through the inductor, and when the second switch tube is switched off and the first switch tube is switched on, the first current transformer circuit is used for collecting the second current flowing through the first switch tube and enabling the collected current to flow through the sampling resistor.
2. The totem-pole bridgeless circuit of claim 1, further comprising a third current transformer circuit connected between the first parallel connection point and a second parallel connection point, the output of the third current transformer circuit sharing the first connection point;
when the power supply works in the positive half cycle of alternating current, the second switch tube is opened, and the first switch tube is closed, or when the power supply works in the negative half cycle of alternating current, the second switch tube is closed, and the first switch tube is opened, the third current transformer circuit is used for collecting the current flowing through the load unit, and enabling the collected current to flow through the sampling resistor.
3. The totem-pole bridgeless circuit of claim 1,
the first current transformer circuit comprises a first current transformer, a first reset resistor, a third diode and a first sampling switch;
the first sampling switch comprises a first input end, a first output end and a first control end;
the first current transformer comprises a first primary winding and a first secondary winding, the first primary winding is connected between the first parallel connection point and the first series connection point, one end of the first secondary winding is respectively connected with one end of the first reset resistor and the anode of the third diode, the other end of the first reset resistor is grounded, the cathode of the third diode is connected with the first input end of the first sampling switch, the first output end of the first sampling switch is the first connection point, and the first control end is used for inputting a first control signal;
when the power supply works in the positive half cycle of alternating current, the first control signal controls the first sampling switch to be in an off state;
when the power supply works in the negative half cycle of the alternating current, the first control signal controls the first sampling switch to be in a closed state.
4. The totem-pole bridgeless circuit of claim 1,
the second current transformer circuit comprises a second current transformer, a second reset resistor, a fourth diode and a second sampling switch;
the second sampling switch comprises a second input end, a second output end and a second control end;
the second current transformer comprises a second primary winding and a second secondary winding, the second primary winding is connected between the second parallel connection point and the first series connection point, one end of the second secondary winding is respectively connected with one end of the second reset resistor and the anode of the fourth diode, the other end of the second reset resistor is grounded, the cathode of the fourth diode is connected with the second input end of the second sampling switch, the second output end of the second sampling switch is the first connection point, and the second control end is used for inputting a second control signal;
when the power supply works in the positive half cycle of the alternating current, the second control signal controls the second sampling switch to be in a closed state;
when the power supply works in the negative half cycle of the alternating current, the second control signal controls the second sampling switch to be in an off state.
5. The totem-pole bridgeless circuit of claim 1,
the first current transformer circuit comprises a third current transformer, a third reset resistor, a fifth diode and a third sampling switch;
the third sampling switch comprises a third input end, a third output end and a third control end;
the third current transformer comprises a third primary winding and a third secondary winding, the third primary winding is connected between the first parallel connection point and the first serial connection point, one end of the third secondary winding is respectively connected with one end of a third reset resistor, the anode of a fifth diode and a third input end of a third sampling switch, the other end of the third reset resistor is grounded, the cathode of the fifth diode is connected with the first connection point, a third output end of the third sampling switch is grounded, and a third control end is used for inputting a third control signal;
when the power supply works in the positive half cycle of the alternating current, the third control signal controls the third sampling switch to be in a closed state;
when the power supply works in the negative half cycle of the alternating current, the third control signal controls the third sampling switch to be in an off state.
6. The totem-pole bridgeless circuit of claim 5,
the first current transformer circuit further comprises a sixth diode;
the third sampling switch is a first N-channel insulated gate field effect transistor, a drain electrode of the first N-channel insulated gate field effect transistor is the third input end, a source electrode is the third output end, and a gate electrode is the third control end;
the anode of the sixth diode is connected with the anode of the fifth diode, the cathode of the sixth diode is connected with the drain electrode of the first N-channel insulated gate field effect transistor, and the source electrode of the sixth diode is grounded.
7. The totem-pole bridgeless circuit of claim 1,
the second current transformer circuit comprises a fourth current transformer, a fourth reset resistor, a seventh diode and a fourth sampling switch;
the fourth sampling switch comprises a fourth input end, a fourth output end and a fourth control end;
the second current transformer comprises a fourth primary winding and a fourth secondary winding, the fourth primary winding is connected between the second parallel connection point and the first serial connection point, one end of the fourth secondary winding is respectively connected with one end of a fourth reset resistor, the anode of a seventh diode and the fourth input end of a fourth sampling switch, the other end of the fourth reset resistor is grounded, the cathode of the seventh diode is connected with the first connection point, the fourth output end of the fourth sampling switch is grounded, and the fourth control end is used for inputting a fourth control signal;
when the power supply works in the positive half cycle of the alternating current, the fourth control signal controls the fourth sampling switch to be in an off state;
when the power supply works in the negative half cycle of the alternating current, the fourth control signal controls the fourth sampling switch to be in a closed state.
8. The totem-pole bridgeless circuit of claim 7,
the second current transformer circuit further comprises an eighth diode;
the fourth sampling switch is a second N-channel insulated gate field effect transistor, a drain electrode of the second N-channel insulated gate field effect transistor is the fourth input end, a source electrode is the fourth output end, and a gate electrode is the fourth control end;
the anode of the eighth diode is connected with the anode of the seventh diode, the cathode of the eighth diode is connected with the drain of the second N-channel insulated gate field effect transistor, and the source is grounded.
9. The totem-pole bridgeless circuit of any one of claims 2, 5, and 6, wherein the third current transformer circuit comprises a fifth current transformer, a fifth reset resistor, and a ninth diode;
the fifth current transformer comprises a fifth primary winding and a fifth secondary winding, the fifth primary winding is connected between the first parallel connection point and the second parallel connection point, one end of the fifth secondary winding is connected with one end of a fifth reset resistor and the anode of the ninth diode respectively, the other end of the fifth reset resistor is grounded, and the cathode of the ninth diode is connected with the first connection point.
10. A totem-pole bridgeless circuit system comprising the totem-pole bridgeless circuit of claim 1, further comprising a control unit;
the control unit comprises a fifth control end, a sixth control end, a seventh control end, a first control output end, a second control output end, a third control output end and a fourth control output end, wherein the fifth control end is used for sampling voltages at two ends of the power supply, the sixth control end is connected with the first connecting point and is used for sampling voltages at two ends of the sampling resistor, the seventh control end is connected with the input end of the load unit and is used for sampling the output voltage of the totem pole bridgeless circuit, the first control output end is connected with the first current transformer circuit, the second control output end is connected with the second current transformer circuit, the third control output end is connected with the first switch tube, and the fourth control output end is connected with the second switch tube;
the control unit controls the working states of the first current transformer circuit, the second current transformer circuit, the first switch tube and the second switch tube according to the sampled voltages at the two ends of the power supply, the sampled voltages at the two ends of the resistor and the output voltage of the totem-pole bridgeless circuit.
11. The totem-pole bridgeless circuit system of claim 10, further comprising a third current transformer circuit connected between the first parallel connection point and a second parallel connection point, the output of the third current transformer circuit sharing the first connection point;
when the power supply works in the positive half cycle of alternating current, the second switch tube is opened and the first switch tube is closed, or when the power supply works in the negative half cycle of alternating current, the second switch tube is closed and the first switch tube is opened, the third current transformer circuit is used for collecting the current flowing through the load unit and enabling the collected current to flow through the sampling resistor.
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| CN109004850B (en) * | 2017-06-07 | 2021-06-25 | 杭州先途电子有限公司 | Half-bridge active power factor correction circuit, variable frequency controller and power supply circuit |
| CN107482929B (en) * | 2017-07-25 | 2023-03-31 | 深圳慧能泰半导体科技有限公司 | Switch control method, controller, totem-pole bridgeless system and electronic equipment |
| CN107302304B (en) * | 2017-08-21 | 2023-04-07 | 深圳慧能泰半导体科技有限公司 | Switch control method and digital controller |
| CN109962610A (en) * | 2017-12-22 | 2019-07-02 | 恩智浦美国有限公司 | Power factor compensation circuit |
| CN109507469B (en) * | 2019-02-14 | 2019-06-11 | 上海颛芯企业管理咨询合伙企业（有限合伙） | Current sensing device |
| TWI678607B (en) | 2019-04-10 | 2019-12-01 | 群光電能科技股份有限公司 | Totem-pole bridgeless pfc conversion device and method of operating the same |
| JP2023537125A (en) * | 2020-08-12 | 2023-08-30 | ファーウェイ デジタル パワー テクノロジーズ カンパニー リミテッド | Totem pole bridgeless power factor correction circuit and power electronics device |
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