WO2024088139A1 - Totem-pole bridgeless circuit, surge protection method thereof and power supply module - Google Patents

Totem-pole bridgeless circuit, surge protection method thereof and power supply module Download PDF

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Publication number
WO2024088139A1
WO2024088139A1 PCT/CN2023/125272 CN2023125272W WO2024088139A1 WO 2024088139 A1 WO2024088139 A1 WO 2024088139A1 CN 2023125272 W CN2023125272 W CN 2023125272W WO 2024088139 A1 WO2024088139 A1 WO 2024088139A1
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WIPO (PCT)
Prior art keywords
slow
switch tube
unit
fast
bridge arm
Prior art date
Application number
PCT/CN2023/125272
Other languages
French (fr)
Chinese (zh)
Inventor
谢仁践
刘翔
Original Assignee
深圳慧能泰半导体科技有限公司
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Publication of WO2024088139A1 publication Critical patent/WO2024088139A1/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12Conversion 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
    • H02M7/21Conversion 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
    • H02M7/217Conversion 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
    • H02M7/219Conversion 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 in a bridge configuration
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/025Current limitation using field effect transistors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/0003Details of control, feedback or regulation circuits
    • H02M1/0009Devices or circuits for detecting current in a converter
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/08Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10Technologies 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

Definitions

  • the embodiments of the present application relate to the field of power electronics technology, and in particular to a totem pole bridgeless circuit and a surge protection method and a power supply module.
  • bridgeless circuits can eliminate some or all diodes, thereby reducing the conduction loss of the circuit and having advantages in efficient energy conversion.
  • the Totem-Pole Bridgeless circuit has the advantages of simple circuit structure and high conversion efficiency, and has been increasingly widely used in recent years.
  • the inventors found that there are at least the following problems in the above-mentioned related technologies: At present, due to the characteristics of the circuit structure of the totem pole bridgeless circuit, the input current will inevitably pass through the switch tube in the bridge arm unit. Limited by the impact current resistance capability of the switch tube in the bridge arm unit, when there is a large surge current generated by lightning strikes on the AC input, the switch tube in the bridge arm unit is easily damaged.
  • the present application provides a totem pole bridgeless circuit and a surge protection method thereof, a power supply Module.
  • a totem pole bridgeless circuit comprising: a slow bridge arm unit, comprising a first slow switch tube and a second slow switch tube connected in series in the same direction; a fast bridge arm unit, comprising a first fast switch tube and a second fast switch tube connected in series in the same direction, and the fast bridge arm unit and the slow bridge arm unit are connected in parallel; an AC input unit, one end of which is connected between the first slow switch tube and the second slow switch tube, and the other end of which is connected between the first fast switch tube and the second fast switch tube; a current sampling unit, comprising a first sampling resistor and a second sampling resistor, the first sampling resistor is connected between the AC input unit and the second slow switch tube, and the second sampling resistor is connected between the AC input unit and the first slow switch tube; a surge protection unit, an input end of which is connected to the current sampling unit, and an output end of which is connected to the slow bridge arm unit and the fast bridge arm
  • the surge protection unit includes: a current limiting resistor, one end of which is connected to the current sampling unit; a hysteresis comparator, a non-phase input end of which is connected to the other end of the current limiting resistor, and the hysteresis comparator is configured to output a high-level signal when the current sampling unit collects a surge current; a low-pass filter, an input end of which is connected to the other end of the current limiting resistor, and an output end of which is connected to the inverting input end of the hysteresis comparator; a controller, an input end of which is connected to the output end of the hysteresis comparator, and an output end of which is respectively connected to the control ends of the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube, and is configured to drive the switch tubes in the slow bridge arm unit and the fast bridge arm unit to disconnect when the hysteresis comparator outputs a high
  • the low-pass filter includes: a filter resistor connected to the limit Between the other end of the current limiting resistor and the inverting input terminal of the hysteresis comparator; a first filter capacitor, one end of which is connected to the other end of the current limiting resistor and the other end of which is grounded; a second filter capacitor, one end of which is connected to the inverting input terminal of the hysteresis comparator and the other end of which is grounded.
  • the input end of the surge protection unit is connected between the first sampling resistor and the second slow switching tube, and one end of the second sampling resistor connected to the first slow switching tube is grounded, or the input end of the surge protection unit is connected between the second sampling resistor and the first slow switching tube, and one end of the first sampling resistor connected to the second slow switching tube is grounded.
  • the AC input unit also includes: an electromagnetic interference filter, whose input end is connected to the AC power supply, and whose negative output end is connected between the first sampling resistor and the second sampling resistor; an input inductor, one end of which is connected to the positive output end of the electromagnetic interference filter, and the other end of which is connected between the first fast switching tube and the second fast switching tube.
  • the totem pole bridgeless circuit also includes: a surge bypass unit, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit, the surge bypass unit includes a first diode and a second diode connected in series in the same direction, and the positive output terminal of the electromagnetic interference filter is connected between the cathode of the first diode and the anode of the second diode.
  • the switching of the first slow switch tube and the second slow switch tube is synchronized with the frequency of the output voltage of the AC power supply, and the reverse recovery time of the first fast switch tube and the second fast switch tube is shorter than the reverse recovery time of the first slow switch tube and the second slow switch tube.
  • the totem pole bridgeless circuit further includes: an AC output unit, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit, wherein the AC output unit includes: an output filter capacitor, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit; and an output load, which is connected in parallel with the output filter capacitor.
  • a surge protection method for a totem pole bridgeless circuit is provided in an embodiment of the present application, which is applied to the totem pole bridgeless circuit as described in the first aspect, and the method includes: collecting the current passing through the slow bridge arm unit through a current sampling unit; when the change in the collected current exceeds the threshold of the hysteresis comparator, the surge protection unit controls the switch tubes in the slow bridge arm unit and the fast bridge arm unit to disconnect.
  • an embodiment of the present application provides a power supply module, including: a totem pole bridgeless circuit as described in the first aspect.
  • the embodiment of the present application provides a totem pole bridgeless circuit and a surge protection method thereof, and a power supply module.
  • the circuit includes a slow bridge arm unit and a fast bridge arm unit connected in parallel, an AC input unit connected between the midpoints of two switch tubes in the slow bridge arm unit and the midpoints of two switch tubes in the fast bridge arm unit, a current sampling unit and a surge protection unit.
  • the current sampling unit includes a sampling resistor connected in series with the two switch tubes in the slow bridge arm unit, respectively.
  • the circuit can control the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected through the surge protection unit, thereby realizing surge protection of the totem pole bridgeless circuit and the power supply module, and the circuit structure is simple and the response speed is fast.
  • FIG1 is a structural block diagram of a totem pole bridgeless circuit provided in Embodiment 1 of the present application;
  • FIG2 is a schematic diagram of a circuit structure of a totem pole bridgeless circuit provided in Example 1 of the present application;
  • FIG3 is a schematic diagram of the circuit structure of another totem pole bridgeless circuit provided in Example 1 of the present application.
  • FIG4 is a structural block diagram of another totem pole bridgeless circuit provided in Example 1 of the present application.
  • FIG5( a ) is a schematic diagram of an energy storage circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the positive half cycle of the AC power;
  • FIG5( b ) is a schematic diagram of a freewheeling circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the positive half cycle of the AC power;
  • FIG5( c ) is a schematic diagram of the energy storage circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the negative half cycle of the AC power;
  • FIG5( d ) is a schematic diagram of a freewheeling circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the negative half cycle of the AC power;
  • FIG6( a ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when struck by in-phase lightning during the positive half cycle of the AC power supply;
  • FIG6( b ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when a reverse-phase lightning strike occurs during the positive half cycle of the AC power supply;
  • FIG6( c ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when struck by in-phase lightning during the negative half cycle of the AC power supply;
  • FIG6( d ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when a reverse-phase lightning strike occurs during the negative half cycle of the AC power supply;
  • FIG7( a ) is a schematic diagram of current sampling and protection waveforms under reverse-phase lightning strike during the positive half cycle of the AC power supply;
  • FIG7( b ) is a schematic diagram of current sampling and protection waveforms under reverse-phase lightning strike at the negative half cycle of the AC power supply;
  • FIG8 is a flow chart of a surge protection method for a totem pole bridgeless circuit provided in Embodiment 2 of the present application;
  • FIG9 is a schematic diagram of the hardware structure of a power supply module provided in Example 3 of the present application.
  • 100 totem pole bridgeless circuit
  • 110 slow bridge arm unit
  • 120 fast bridge arm unit
  • 130 AC input unit
  • 140 current sampling unit
  • 150 surge protection unit
  • 160 surge bypass unit
  • 170 AC output unit
  • AC AC power supply
  • SR1 first slow switch tube
  • Q1 first fast switch tube
  • Q2 second fast switch tube
  • EMI electromagnetic interference filter
  • U hysteresis comparator
  • LPF low-pass filter
  • CNTLR controller
  • R1 current limiting resistor; R2, filter resistor; C1, output filter capacitor; C2, first filter capacitor; C3, second filter capacitor; D1, first diode; D2, second diode; RL output load; 10, power module.
  • the embodiment of the present application provides a totem pole bridgeless circuit and its surge protection method, and a power supply module.
  • the totem pole bridgeless circuit collects the current flowing through the switch tube of the slow bridge arm unit through a current sampling unit, and controls the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected through the surge protection unit when the surge current is collected, so as to achieve surge protection for the totem pole bridgeless circuit and the power supply module.
  • the circuit structure is simple and the response speed is fast. When the change in the collected current exceeds the threshold of the hysteresis comparator, it is determined that the current collected by the current sampling unit is a surge current.
  • the embodiment of the present application provides a totem pole bridgeless circuit.
  • FIG. 1 shows a structural block diagram of a totem pole bridgeless circuit provided by the embodiment of the present application.
  • the totem pole bridgeless circuit 100 includes: a slow bridge arm unit 110, a fast bridge arm unit 120, an AC input unit 130, a current sampling unit 140 and a surge protection unit 150.
  • the totem pole bridgeless circuit 100 can determine that the current sampling unit 140 collects the current flowing through the surge protection unit 150.
  • the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 are driven to be disconnected by the surge protection unit 150, thereby realizing surge protection.
  • FIG. 2 shows a circuit structure of a totem pole bridgeless circuit provided in an embodiment of the present application.
  • the slow bridge arm unit 110 includes a first slow switch tube SR1 and a second slow switch tube SR2 connected in series in the same direction, and the switching of the first slow switch tube SR1 and the second slow switch tube SR2 is synchronized with the frequency of the output voltage of the alternating current power source AC.
  • the fast bridge arm unit 120 includes a first fast switch tube Q1 and a second fast switch tube Q2 connected in series in the same direction, and the fast bridge arm unit 120 is connected in parallel with the slow bridge arm unit 110.
  • the reverse recovery time of the first fast switch tube Q1 and the second fast switch tube Q2 is shorter than the reverse recovery time of the first slow switch tube SR1 and the second slow switch tube SR2.
  • the "fast” and “slow” are relative speeds in reverse recovery time.
  • the reverse recovery time of the fast switch tube is lower than the conduction voltage of the slow switch tube, and the reverse recovery time is shorter and faster.
  • the connection with the output side circuit can be disconnected first to protect the electronic components on the output side.
  • the first slow switch tube SR1 and the second slow switch tube SR2 can be power switch devices such as thyristors, MOS tubes, IGBT tubes, and the slow switch tube and the fast switch tube can be the same type/model switch tube, or different types and models of switch tubes, which can be selected according to actual needs.
  • the AC input unit 130 has one end connected between the first slow switch tube SR1 and the second slow switch tube SR2, and the other end connected between the first fast switch tube Q1 and the second fast switch tube Q2.
  • the AC input unit 130 is used to receive AC power and input the received AC power into the bridge arm unit for voltage conversion.
  • the AC input unit 130 also includes: an electromagnetic interference filter (EMI filter) EMI, whose input end is connected to the AC power supply AC, and whose negative output end is connected between the first sampling resistor RS1 and the second sampling resistor RS2; an input inductor L1, one end of which is connected to the positive output end of the electromagnetic interference filter EMI, and the other end of which is connected between the first fast switch tube Q1 and the second fast switch tube Q2.
  • EMI filter electromagnetic interference filter
  • the current sampling unit 140 includes a first sampling resistor RS1 and a second sampling resistor RS2, wherein the first sampling resistor RS1 is connected between the AC input unit 130 and the second slow switch tube SR2, and the second sampling resistor RS2 is connected between the AC input unit 130 and the first slow switch tube SR1.
  • the embodiment of the present application can achieve fast current sampling and thus fast protection by using a resistor to collect power.
  • the surge protection unit 150 has an input end CS connected to the current sampling unit 140, and an output end connected to the slow bridge arm unit 110 and the fast bridge arm unit 120 respectively.
  • the surge protection unit 150 is configured to control the first slow switch tube SR1, the second slow switch tube SR2, the first fast switch tube Q1 and the second fast switch tube Q2 to be disconnected when a surge current is collected by the current sampling unit 140.
  • the surge protection unit 150 includes: a current limiting resistor R1, a hysteresis comparator U1, a low-pass filter LPF and a controller CNTLR.
  • the current limiting resistor R1 one end of which is connected to the current sampling unit 140
  • the hysteresis comparator U1 its positive phase input end is connected to the other end of the current limiting resistor R1, and the hysteresis comparator U1 is configured to output a high-level signal when the current sampling unit 140 collects a surge current
  • the low-pass filter LPF its input end is connected to the other end of the current limiting resistor R1, and its output end is connected to the inverting input end of the hysteresis comparator U1
  • the controller CNTLR its input end is connected to the output end of the hysteresis comparator U1, and its output end is respectively connected to the first slow switch
  • the change rate of the current flowing through the first slow switch SR1 and the second slow switch SR2 can be detected by the hysteresis comparator U1
  • the reference threshold of the hysteresis comparator U1 is a non-fixed value
  • the threshold is adjusted by the low-pass filter LPF
  • the hysteresis comparator U1 is only triggered when the current signal input at the input terminal CS increases rapidly, which can effectively prevent false triggering.
  • the controller CNTLR is a logic control unit, which can output a low-level pulse width modulation signal to control the switching tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to disconnect when the hysteresis comparator U1 outputs a high-level signal.
  • the low-pass filter LPF is composed of a CRC filter circuit.
  • the filter bandwidth can be adjusted according to actual needs.
  • the low-pass filter LPF includes: a filter resistor R2, connected between the other end of the current limiting resistor R1 and the inverting input end of the hysteresis comparator U1; a first filter capacitor C2, one end of which is connected to the other end of the current limiting resistor R1, and the other end of which is grounded; a second filter capacitor C3, one end of which is connected to the inverting input end of the hysteresis comparator U1, and the other end of which is grounded.
  • the input end CS of the surge protection unit 150 is connected between the first sampling resistor RS1 and the second slow switch tube SR2, and one end of the second sampling resistor RS2 connected to the first slow switch tube SR1 is grounded; or, please refer to FIG. 3 , which shows a circuit structure of another totem pole bridgeless circuit provided in an embodiment of the present application, or the input end CS of the surge protection unit 150 is connected between the second sampling resistor RS2 and the first slow switch tube SR1, and one end of the first sampling resistor RS1 connected to the second slow switch tube SR2 is grounded.
  • the totem pole bridgeless circuit 100 also includes: a surge bypass unit 160 and an AC output unit 170, the surge bypass unit 160 is connected in parallel with the fast bridge arm unit 120 and the slow bridge arm unit 110, and the AC output unit 170 is also connected in parallel with the fast bridge arm unit 120 and the slow bridge arm unit 110.
  • the surge bypass unit 160 includes a first diode D1 and a second diode D2 connected in series in the same direction, and the positive output end of the electromagnetic interference filter EMI is connected between the cathode of the first diode D1 and the anode of the second diode D2.
  • the AC output unit 170 includes: an output filter capacitor C1 connected in parallel with the fast bridge arm unit 120 and the slow bridge arm unit 110 ; and an output load RL connected in parallel with the output filter capacitor C1 .
  • FIG. 5 shows the energy storage circuit and the freewheeling circuit of the totem pole bridgeless circuit 100 provided in the embodiment of the present application when the alternating current is supplied through the positive and negative half cycles respectively, taking the structure of the totem pole bridgeless circuit 100 shown in FIG. 2 as an example. Specifically,
  • Figure 5(a) shows the energy storage circuit of the totem pole bridgeless circuit 100 shown in Figure 2 when the AC power supply AC input is normal and it is the positive half cycle of the AC power.
  • the first fast switch tube Q1 is the main tube of the Boost boost circuit
  • the second fast switch tube Q2 is the freewheeling tube of the Boost boost circuit
  • the first slow switch tube SR1 remains on
  • the second slow switch tube SR2 remains off; when the first fast switch tube Q1 is closed and the second fast switch tube Q2 is disconnected, the input inductor L1, the first fast switch tube Q1, and the first slow switch tube SR1 constitute an energy storage circuit
  • the AC power supply AC stores energy in the input inductor L1; and the output filter capacitor C1 and the output load RL on the output side also constitute a separate current loop.
  • FIG. 5( b ) shows the freewheeling circuit of the totem pole bridgeless circuit 100 shown in FIG. 2 when the AC power supply AC input is normal and is in the positive half cycle of the AC power.
  • the first fast The switch tube Q1 is the main tube of the Boost boost circuit
  • the second fast switch tube Q2 is the freewheeling tube of the Boost boost circuit
  • the first slow switch tube SR1 remains on
  • the second slow switch tube SR2 remains off; when the second fast switch tube Q2 is closed and the first fast switch tube Q1 is disconnected, the input inductor L1, the second fast switch tube Q2, and the first slow switch tube SR1 form a freewheeling circuit, and the input inductor L1 and/or the AC power supply AC release energy to the output filter capacitor C1 and the output load RL at the load end.
  • Figure 5(c) shows the energy storage circuit of the totem pole bridgeless circuit 100 shown in Figure 2 when the AC power supply AC input is normal and it is the negative half cycle of the AC power.
  • the second fast switch tube Q2 is the main tube of the Boost boost circuit
  • the first fast switch tube Q1 is the freewheeling tube of the Boost boost circuit
  • the first slow switch tube SR1 remains turned off
  • the second slow switch tube SR2 remains turned on
  • the second fast switch tube Q2 is closed and the first fast switch tube Q1 is disconnected
  • the second slow switch tube SR2, the second fast switch tube Q2, and the input inductor L1 constitute an energy storage circuit
  • the AC power supply AC stores energy in the input inductor L1
  • the output filter capacitor C1 and the output load RL on the output side also constitute a separate current loop.
  • Figure 5(d) shows the freewheeling circuit of the totem pole bridgeless circuit 100 shown in Figure 2 when the AC power supply AC input is normal and it is the negative half cycle of the AC power.
  • the second fast switch tube Q2 is the main tube of the Boost boost circuit
  • the first fast switch tube Q1 is the freewheeling tube of the Boost boost circuit
  • the first slow switch tube SR1 remains turned off
  • the second slow switch tube SR2 remains turned on; when the first fast switch tube Q1 is closed and the second fast switch tube Q2 is disconnected, the second slow switch tube SR2, the first fast switch tube Q1, and the input inductor L1 constitute a freewheeling circuit, and the input inductor L1 and/or the AC power supply AC release energy to the output filter capacitor C1 and the output load RL at the load end.
  • FIG6 shows the surge current paths of the same-phase and anti-phase lightning strikes generated by the totem pole bridgeless circuit 100 provided in the embodiment of the present application when the AC power is supplied through the positive and negative half cycles respectively, taking the structure of the totem pole bridgeless circuit 100 shown in FIG2 as an example.
  • FIG6(a) shows the surge current path of the totem pole bridgeless circuit 100 shown in FIG2 when the same-phase lightning strikes the AC positive half cycle.
  • the surge protection unit 150 can achieve surge protection without controlling the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off.
  • the surge protection unit 150 can also be configured to control the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off to achieve surge protection.
  • FIG6(b) shows the surge current path of the totem pole bridgeless circuit 100 shown in FIG2 under reverse-phase lightning strike at the positive half cycle of the AC power supply AC. Since the surge current does not pass through the input inductor L1, the surge current has a large amplitude and is easy to damage the first slow switch tube SR1.
  • FIG7(a) shows the current sampling and protection waveform under reverse-phase lightning strike at the positive half cycle of the AC power supply AC.
  • the current I_SR1 flowing through the first sampling resistor RS1 and the first slow switch tube SR1 increases sharply, and the current collected at the output terminal CS of the current sampling unit 140, that is, the input terminal CS of the surge protection unit 150, also increases sharply synchronously, and quickly changes from a negative level in a normal state to a positive level.
  • the current change rate is large, causing the hysteresis comparator U1 to reverse, and the output terminal Trig of the hysteresis comparator U1 outputs a high-level signal to drive the controller CNTLR to output a low-level pulse width modulation (PWM) signal to the control terminals of the first slow switch tube SR1 and the first fast switch tube Q1, and quickly turns off the first slow switch tube SR1 and the first fast switch tube Q1 to achieve surge protection.
  • PWM pulse width modulation
  • FIG6(c) shows the surge current path of the totem pole bridgeless circuit 100 shown in FIG2 when the same-phase lightning strike occurs at the negative half cycle of the AC power supply AC.
  • the surge protection unit 150 can achieve surge protection without controlling the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off.
  • the surge protection unit 150 can also be configured to control the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off to achieve surge protection.
  • FIG 6(d) shows the surge current path of the totem pole bridgeless circuit 100 shown in Figure 2 during the reverse lightning strike at the negative half-cycle of the AC power supply AC.
  • the surge protection unit 150 needs to be configured to control the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off to achieve surge protection.
  • FIG. 6(d) shows the surge current path of the totem pole bridgeless circuit 100 shown in Figure 2 under reverse lightning strike at the negative half cycle of the AC power supply AC. Since the surge current does not pass through the input inductor L1, the surge current has a large amplitude and is easy to damage the first slow switch tube SR1.
  • Figure 7(b) shows the current sampling and protection waveform under reverse lightning strike at the negative half cycle of the AC power supply AC.
  • the current change rate is large, causing the hysteresis comparator U1 to reverse, and the output terminal Trig of the hysteresis comparator U1 outputs a high-level signal to drive the controller CNTLR to output a low-level pulse width modulation (PWM) signal to the control terminals of the second slow switch tube SR2 and the second fast switch tube Q2, and quickly turns off the second slow switch tube SR2 and the second fast switch tube Q2 to achieve surge protection.
  • PWM pulse width modulation
  • the embodiment of the present application provides a surge protection method for a totem pole bridgeless circuit.
  • the surge protection method is applied to the totem pole bridgeless circuit as described in the first embodiment.
  • FIG8 shows a surge protection method provided by the embodiment of the present application, and the method includes but is not limited to the following steps:
  • Step S10 collecting the current passing through the slow bridge arm unit through the current sampling unit
  • Embodiment 1 it can be known that the current passing through the switch tube of the slow bridge arm unit can be quickly collected by the current sampling unit, so that when a surge current occurs, the surge current is collected and the collected current is output to the surge protection unit to achieve rapid surge protection.
  • Step S20 When the acquired current variation exceeds the threshold of the hysteresis comparator, the surge protection unit controls the switch tubes in the slow bridge arm unit and the fast bridge arm unit to be disconnected.
  • An embodiment of the present application provides a power supply module. Please refer to Figure 9, which shows the hardware structure of a power supply module provided by an embodiment of the present application.
  • the power supply module 10 includes: a totem pole bridgeless circuit 100 as described in Example 1.
  • the totem pole bridgeless circuit 100 provided in the first embodiment of the present application can be used to realize the protection of the AC power supply when the same-phase lightning strike and the opposite-phase lightning strike occur. protection to achieve surge protection.
  • a totem pole bridgeless circuit and a surge protection method and a power supply module are provided.
  • the circuit includes a slow bridge arm unit and a fast bridge arm unit connected in parallel, an AC input unit connected between the midpoints of two switch tubes in the slow bridge arm unit and the midpoints of two switch tubes in the fast bridge arm unit, a current sampling unit and a surge protection unit.
  • the current sampling unit includes a sampling resistor connected in series with the two switch tubes in the slow bridge arm unit, respectively.
  • the circuit can control the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected through the surge protection unit, thereby realizing surge protection for the totem pole bridgeless circuit and the power supply module, and the circuit structure is simple and the response speed is fast.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, and may be located in one place or distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each implementation method can be implemented by means of software plus a general hardware platform, and of course, can also be implemented by hardware.
  • a person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium.
  • the program When the program is executed, it can include the processes of the embodiments of the above-mentioned methods.
  • the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.

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Abstract

A totem-pole bridgeless circuit. The circuit comprises a slow bridge arm unit (110) and a fast bridge arm unit (120) which are connected in parallel; an alternating-current input unit (130) connected between the midpoint of two switching transistors in the slow bridge arm unit (110) and the midpoint of two switching transistors in the fast bridge arm unit (120); a current sampling unit (140); and a surge protection unit (150). The current sampling unit (140) comprises sampling resistors respectively connected in series with the two switching transistors in the slow bridge arm unit (110). When the current sampling unit (140) collects a surge current, the circuit can control, by means of the surge protection unit (150), a first slow switching transistor (SR1), a second slow switching transistor (SR2), a first fast switching transistor (Q1) and a second fast switching transistor (Q2) to be disconnected, thereby realizing surge protection of the totem-pole bridgeless circuit. The totem-pole bridgeless circuit has a simple circuit structure and a fast response speed. Also disclosed are a totem-pole bridgeless circuit surge protection method and a power supply module.

Description

一种图腾柱无桥电路及其浪涌保护方法、电源模组A totem pole bridgeless circuit and surge protection method thereof, and power supply module
相关申请的交叉参考CROSS-REFERENCE TO RELATED APPLICATIONS
本申请要求于2022年10月28日提交中国专利局,申请号为202211333044.7,发明名称为“一种图腾柱无桥电路及其浪涌保护方法、电源模组”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。This application claims priority to a Chinese patent application filed with the China Patent Office on October 28, 2022, with application number 202211333044.7, and invention name “A totem pole bridgeless circuit, surge protection method, and power supply module”, all contents of which are incorporated by reference in this application.
技术领域Technical Field
本申请实施例涉及电力电子技术领域,特别涉及一种图腾柱无桥电路及其浪涌保护方法、电源模组。The embodiments of the present application relate to the field of power electronics technology, and in particular to a totem pole bridgeless circuit and a surge protection method and a power supply module.
背景技术Background technique
在能源转换系统中,电源的转换效率是评价系统的一个重要参数。与传统的功率转换电路相比,无桥电路可以消除部分或者全部二极管,从而降低电路的导通损耗,在高效能源转换上具有优势。而图腾柱无桥(Totem-Pole Bridgeless)电路作为无桥电路的一种,具有电路结构简单和转换效率高等优点,近年来得到越来越普遍的应用。In energy conversion systems, the conversion efficiency of power supply is an important parameter for evaluating the system. Compared with traditional power conversion circuits, bridgeless circuits can eliminate some or all diodes, thereby reducing the conduction loss of the circuit and having advantages in efficient energy conversion. As a type of bridgeless circuit, the Totem-Pole Bridgeless circuit has the advantages of simple circuit structure and high conversion efficiency, and has been increasingly widely used in recent years.
在实现本申请实施例过程中,发明人发现以上相关技术中至少存在如下问题:目前,图腾柱无桥电路由于其电路结构的特性,输入电流必然会经过桥臂单元中的开关管,受限于桥臂单元中开关管的耐冲击电流能力,在交流输入有雷击产生的较大的浪涌电流的情况下,容易损坏桥臂单元中开关管。In the process of implementing the embodiments of the present application, the inventors found that there are at least the following problems in the above-mentioned related technologies: At present, due to the characteristics of the circuit structure of the totem pole bridgeless circuit, the input current will inevitably pass through the switch tube in the bridge arm unit. Limited by the impact current resistance capability of the switch tube in the bridge arm unit, when there is a large surge current generated by lightning strikes on the AC input, the switch tube in the bridge arm unit is easily damaged.
发明内容Summary of the invention
本申请实施例提供了一种图腾柱无桥电路及其浪涌保护方法、电源 模组。The present application provides a totem pole bridgeless circuit and a surge protection method thereof, a power supply Module.
本申请实施例的目的是通过如下技术方案实现的:The purpose of the embodiment of the present application is achieved through the following technical solutions:
为解决上述技术问题,第一方面,本申请实施例中提供了一种图腾柱无桥电路,包括:慢速桥臂单元,包括同向串联的第一慢速开关管和第二慢速开关管;快速桥臂单元,包括同向串联的第一快速开关管和第二快速开关管,所述快速桥臂单元和所述慢速桥臂单元并联连接;交流输入单元,其一端连接在所述第一慢速开关管和所述第二慢速开关管之间,其另一端连接在所述第一快速开关管和所述第二快速开关管之间;电流采样单元,包括第一采样电阻和第二采样电阻,所述第一采样电阻连接在所述交流输入单元和所述第二慢速开关管之间,所述第二采样电阻连接在所述交流输入单元和所述第一慢速开关管之间;浪涌保护单元,其输入端与所述电流采样单元连接,其输出端分别与所述慢速桥臂单元和所述快速桥臂单元连接,所述浪涌保护单元配置为在通过所述电流采样单元采集到浪涌电流时,控制所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管断开。To solve the above technical problems, in a first aspect, a totem pole bridgeless circuit is provided in an embodiment of the present application, comprising: a slow bridge arm unit, comprising a first slow switch tube and a second slow switch tube connected in series in the same direction; a fast bridge arm unit, comprising a first fast switch tube and a second fast switch tube connected in series in the same direction, and the fast bridge arm unit and the slow bridge arm unit are connected in parallel; an AC input unit, one end of which is connected between the first slow switch tube and the second slow switch tube, and the other end of which is connected between the first fast switch tube and the second fast switch tube; a current sampling unit, comprising a first sampling resistor and a second sampling resistor, the first sampling resistor is connected between the AC input unit and the second slow switch tube, and the second sampling resistor is connected between the AC input unit and the first slow switch tube; a surge protection unit, an input end of which is connected to the current sampling unit, and an output end of which is connected to the slow bridge arm unit and the fast bridge arm unit respectively, and the surge protection unit is configured to control the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected when a surge current is collected by the current sampling unit.
在一些实施例中,所述浪涌保护单元包括:限流电阻,其一端与所述电流采样单元连接;磁滞比较器,其正相输入端与所述限流电阻的另一端连接,所述磁滞比较器配置为在所述电流采样单元采集到浪涌电流时输出高电平信号;低通滤波器,其输入端与所述限流电阻的另一端连接,其输出端与所述磁滞比较器的反相输入端连接;控制器,其输入端与所述磁滞比较器的输出端连接,其输出端分别与所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管的控制端连接,且配置为在所述磁滞比较器输出高电平信号时驱动所述慢速桥臂单元和所述快速桥臂单元中的开关管断开。In some embodiments, the surge protection unit includes: a current limiting resistor, one end of which is connected to the current sampling unit; a hysteresis comparator, a non-phase input end of which is connected to the other end of the current limiting resistor, and the hysteresis comparator is configured to output a high-level signal when the current sampling unit collects a surge current; a low-pass filter, an input end of which is connected to the other end of the current limiting resistor, and an output end of which is connected to the inverting input end of the hysteresis comparator; a controller, an input end of which is connected to the output end of the hysteresis comparator, and an output end of which is respectively connected to the control ends of the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube, and is configured to drive the switch tubes in the slow bridge arm unit and the fast bridge arm unit to disconnect when the hysteresis comparator outputs a high-level signal.
在一些实施例中,所述低通滤波器包括:滤波电阻,连接在所述限 流电阻的另一端和所述磁滞比较器的反相输入端之间;第一滤波电容,其一端与所述限流电阻的另一端连接,其另一端接地;第二滤波电容,其一端与所述磁滞比较器的反相输入端连接,其另一端接地。In some embodiments, the low-pass filter includes: a filter resistor connected to the limit Between the other end of the current limiting resistor and the inverting input terminal of the hysteresis comparator; a first filter capacitor, one end of which is connected to the other end of the current limiting resistor and the other end of which is grounded; a second filter capacitor, one end of which is connected to the inverting input terminal of the hysteresis comparator and the other end of which is grounded.
在一些实施例中,所述浪涌保护单元的输入端连接在所述第一采样电阻和所述第二慢速开关管之间,所述第二采样电阻与所述第一慢速开关管连接的一端接地,或者,所述浪涌保护单元的输入端连接在所述第二采样电阻和所述第一慢速开关管之间,所述第一采样电阻与所述第二慢速开关管连接的一端接地。In some embodiments, the input end of the surge protection unit is connected between the first sampling resistor and the second slow switching tube, and one end of the second sampling resistor connected to the first slow switching tube is grounded, or the input end of the surge protection unit is connected between the second sampling resistor and the first slow switching tube, and one end of the first sampling resistor connected to the second slow switching tube is grounded.
在一些实施例中,所述交流输入单元还包括:电磁干扰滤波器,其输入端与交流电源连接,其负极输出端连接在所述第一采样电阻和所述第二采样电阻之间;输入电感,其一端与所述电磁干扰滤波器的正极输出端连接,其另一端连接在所述第一快速开关管和所述第二快速开关管之间。In some embodiments, the AC input unit also includes: an electromagnetic interference filter, whose input end is connected to the AC power supply, and whose negative output end is connected between the first sampling resistor and the second sampling resistor; an input inductor, one end of which is connected to the positive output end of the electromagnetic interference filter, and the other end of which is connected between the first fast switching tube and the second fast switching tube.
在一些实施例中,所述图腾柱无桥电路还包括:浪涌旁路单元,其与所述快速桥臂单元和所述慢速桥臂单元并联连接,所述浪涌旁路单元包括同向串联的第一二极管和第二二极管,所述电磁干扰滤波器的正极输出端连接在所述第一二极管的阴极和所述第二二极管的阳极之间。In some embodiments, the totem pole bridgeless circuit also includes: a surge bypass unit, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit, the surge bypass unit includes a first diode and a second diode connected in series in the same direction, and the positive output terminal of the electromagnetic interference filter is connected between the cathode of the first diode and the anode of the second diode.
在一些实施例中,所述第一慢速开关管和所述第二慢速开关管的开关与所述交流电源的输出电压的频率同步,所述第一快速开关管和所述第二快速开关管的反向恢复时间比所述第一慢速开关管和所述第二慢速开关管的反向恢复时间短。In some embodiments, the switching of the first slow switch tube and the second slow switch tube is synchronized with the frequency of the output voltage of the AC power supply, and the reverse recovery time of the first fast switch tube and the second fast switch tube is shorter than the reverse recovery time of the first slow switch tube and the second slow switch tube.
在一些实施例中,所述图腾柱无桥电路还包括:交流输出单元,其与所述快速桥臂单元和所述慢速桥臂单元并联连接,其中,所述交流输出单元包括:输出滤波电容,其与所述快速桥臂单元和所述慢速桥臂单元并联连接;输出负载,其与所述输出滤波电容并联连接。 In some embodiments, the totem pole bridgeless circuit further includes: an AC output unit, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit, wherein the AC output unit includes: an output filter capacitor, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit; and an output load, which is connected in parallel with the output filter capacitor.
为解决上述技术问题,第二方面,本申请实施例中提供了一种图腾柱无桥电路的浪涌保护方法,应用于如第一方面所述的图腾柱无桥电路,所述方法包括:通过电流采样单元采集经过慢速桥臂单元的电流;在采集到的电流的变化量超过磁滞比较器的门限时,浪涌保护单元控制慢速桥臂单元和快速桥臂单元中的开关管断开。To solve the above technical problems, in the second aspect, a surge protection method for a totem pole bridgeless circuit is provided in an embodiment of the present application, which is applied to the totem pole bridgeless circuit as described in the first aspect, and the method includes: collecting the current passing through the slow bridge arm unit through a current sampling unit; when the change in the collected current exceeds the threshold of the hysteresis comparator, the surge protection unit controls the switch tubes in the slow bridge arm unit and the fast bridge arm unit to disconnect.
为解决上述技术问题,第三方面,本申请实施例提供了一种电源模组,包括:如第一方面所述的图腾柱无桥电路。To solve the above technical problems, in a third aspect, an embodiment of the present application provides a power supply module, including: a totem pole bridgeless circuit as described in the first aspect.
与现有技术相比,本发明的有益效果是:区别于现有技术的情况,本申请实施例中提供了一种图腾柱无桥电路及其浪涌保护方法、电源模组,该电路包括并联的慢速桥臂单元和快速桥臂单元,连接在慢速桥臂单元中两个开关管中点以及快速桥臂单元中两个开关管中点之间的交流输入单元,电流采样单元及浪涌保护单元,电流采样单元包括分别与慢速桥臂单元中两个开关管串联的采样电阻该电路能够在电流采样单元采集到浪涌电流时,通过浪涌保护单元控制所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管断开,实现对图腾柱无桥电路及电源模组的浪涌保护,且电路结构简单,反应速度快。Compared with the prior art, the beneficial effects of the present invention are as follows: Different from the prior art, the embodiment of the present application provides a totem pole bridgeless circuit and a surge protection method thereof, and a power supply module. The circuit includes a slow bridge arm unit and a fast bridge arm unit connected in parallel, an AC input unit connected between the midpoints of two switch tubes in the slow bridge arm unit and the midpoints of two switch tubes in the fast bridge arm unit, a current sampling unit and a surge protection unit. The current sampling unit includes a sampling resistor connected in series with the two switch tubes in the slow bridge arm unit, respectively. When the current sampling unit collects a surge current, the circuit can control the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected through the surge protection unit, thereby realizing surge protection of the totem pole bridgeless circuit and the power supply module, and the circuit structure is simple and the response speed is fast.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
一个或多个实施例中通过与之对应的附图中的图片进行示例性说明,这些示例性说明并不构成对实施例的限定,附图中具有相同参考数字标号的元件/模块和步骤表示为类似的元件/模块和步骤,除非有特别申明,附图中的图不构成比例限制。One or more embodiments are exemplarily described by pictures in the corresponding drawings, which do not constitute limitations on the embodiments. Elements/modules and steps with the same reference numerals in the drawings are represented as similar elements/modules and steps. Unless otherwise specified, the figures in the drawings do not constitute proportional limitations.
图1是本申请实施例一提供的一种图腾柱无桥电路的结构框图;FIG1 is a structural block diagram of a totem pole bridgeless circuit provided in Embodiment 1 of the present application;
图2是本申请实施例一提供的一种图腾柱无桥电路的电路结构示意图; FIG2 is a schematic diagram of a circuit structure of a totem pole bridgeless circuit provided in Example 1 of the present application;
图3是本申请实施例一提供的另一种图腾柱无桥电路的电路结构示意图;FIG3 is a schematic diagram of the circuit structure of another totem pole bridgeless circuit provided in Example 1 of the present application;
图4是本申请实施例一提供的另一种图腾柱无桥电路的结构框图;FIG4 is a structural block diagram of another totem pole bridgeless circuit provided in Example 1 of the present application;
图5(a)是图2所示图腾柱无桥电路在交流电源输入正常且为交流电的正半周期时的储能回路示意图;FIG5( a ) is a schematic diagram of an energy storage circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the positive half cycle of the AC power;
图5(b)是图2所示图腾柱无桥电路在交流电源输入正常且为交流电的正半周期时的续流回路示意图;FIG5( b ) is a schematic diagram of a freewheeling circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the positive half cycle of the AC power;
图5(c)是图2所示图腾柱无桥电路在交流电源输入正常且为交流电的负半周期时的储能回路示意图;FIG5( c ) is a schematic diagram of the energy storage circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the negative half cycle of the AC power;
图5(d)是图2所示图腾柱无桥电路在交流电源输入正常且为交流电的负半周期时的续流回路示意图;FIG5( d ) is a schematic diagram of a freewheeling circuit of the totem pole bridgeless circuit shown in FIG2 when the AC power input is normal and is in the negative half cycle of the AC power;
图6(a)是图2所示图腾柱无桥电路在交流电源正半周期时刻的同相雷击的浪涌电流路径示意图;FIG6( a ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when struck by in-phase lightning during the positive half cycle of the AC power supply;
图6(b)是图2所示图腾柱无桥电路在交流电源正半周期时刻的反相雷击的浪涌电流路径示意图;FIG6( b ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when a reverse-phase lightning strike occurs during the positive half cycle of the AC power supply;
图6(c)是图2所示图腾柱无桥电路在交流电源负半周期时刻的同相雷击的浪涌电流路径示意图;FIG6( c ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when struck by in-phase lightning during the negative half cycle of the AC power supply;
图6(d)是图2所示图腾柱无桥电路在交流电源负半周期时刻的反相雷击的浪涌电流路径示意图;FIG6( d ) is a schematic diagram of the surge current path of the totem pole bridgeless circuit shown in FIG2 when a reverse-phase lightning strike occurs during the negative half cycle of the AC power supply;
图7(a)是交流电源正半周期时刻的反相雷击下的电流采样和保护波形示意图;FIG7( a ) is a schematic diagram of current sampling and protection waveforms under reverse-phase lightning strike during the positive half cycle of the AC power supply;
图7(b)是交流电源负半周期时刻的反相雷击下的电流采样和保护波形示意图;FIG7( b ) is a schematic diagram of current sampling and protection waveforms under reverse-phase lightning strike at the negative half cycle of the AC power supply;
图8是本申请实施例二提供的一种图腾柱无桥电路的浪涌保护方法的流程示意图; FIG8 is a flow chart of a surge protection method for a totem pole bridgeless circuit provided in Embodiment 2 of the present application;
图9是本申请实施例三提供的一种电源模组的硬件结构示意图。FIG9 is a schematic diagram of the hardware structure of a power supply module provided in Example 3 of the present application.
附图说明:100、图腾柱无桥电路;110、慢速桥臂单元;120、快速桥臂单元;130、交流输入单元;140、电流采样单元;150、浪涌保护单元;160、浪涌旁路单元;170、交流输出单元;AC、交流电源;SR1、第一慢速开关管;SR2、第二慢速开关管;Q1、第一快速开关管;Q2、第二快速开关管;EMI、电磁干扰滤波器;L1、输入电感;RS1、第一采样电阻;RS2、第二采样电阻;U1、磁滞比较器;LPF、低通滤波器;CNTLR、控制器;R1、限流电阻;R2、滤波电阻;C1、输出滤波电容;C2、第一滤波电容;C3、第二滤波电容;D1、第一二极管;D2、第二二极管;RL、输出负载;10、电源模组。Description of the drawings: 100, totem pole bridgeless circuit; 110, slow bridge arm unit; 120, fast bridge arm unit; 130, AC input unit; 140, current sampling unit; 150, surge protection unit; 160, surge bypass unit; 170, AC output unit; AC, AC power supply; SR1, first slow switch tube; SR2, second slow switch tube; Q1, first fast switch tube; Q2, second fast switch tube; EMI, electromagnetic interference filter; L1, input inductor; RS1, first sampling resistor; RS2, second sampling resistor; U1, hysteresis comparator; LPF, low-pass filter; CNTLR, controller; R1, current limiting resistor; R2, filter resistor; C1, output filter capacitor; C2, first filter capacitor; C3, second filter capacitor; D1, first diode; D2, second diode; RL, output load; 10, power module.
具体实施方式Detailed ways
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明,但不以任何形式限制本发明。应当指出的是,对本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以作出若干变形和改进。这些都属于本发明的保护范围。The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
为了使本申请的目的、技术方案及优点更加清楚明白,以下结合附图及实施例,对本申请进行进一步详细说明。应当理解,此处所描述的具体实施例仅用以解释本申请,并不用于限定本申请。In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.
需要说明的是,如果不冲突,本申请实施例中的各个特征可以相互结合,均在本申请的保护范围之内。另外,虽然在装置示意图中进行了功能模块划分,在流程图中示出了逻辑顺序,但是在某些情况下,可以不同于装置中的模块划分,或流程图中的顺序执行所示出或描述的步骤。此外,本文所采用的“第一”、“第二”等字样并不对数据和执行次序进行限定,仅是对功能和作用基本相同的相同项或相似项进行区分。 需要说明的是,当一个元件被表述“连接”另一个元件,它可以是直接连接到另一个元件,或者其间可以存在一个或多个居中的元件。It should be noted that, if there is no conflict, the various features in the embodiments of the present application can be combined with each other, all within the scope of protection of the present application. In addition, although the functional module division is performed in the device schematic diagram and the logical order is shown in the flow chart, in some cases, it may be different from the module division in the device, or the steps shown or described in the order of the flow chart. In addition, the words "first", "second", etc. used herein do not limit the data and the execution order, but only distinguish the same items or similar items with basically the same functions and effects. It should be noted that when an element is expressed as being “connected to” another element, it may be directly connected to the other element, or one or more intervening elements may exist therebetween.
除非另有定义,本说明书所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本说明书中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的,不用于限制本发明。Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
此外,下面所描述的本发明各个实施方式中所涉及的技术特征只要彼此之间未构成冲突就可以相互组合。In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
为了解决当前图腾柱无桥电路无法实现浪涌保护,尤其是无法针对反相雷击形成的浪涌电流进行防护的问题,本申请实施例提供了一种图腾柱无桥电路及其浪涌保护方法、电源模组,该图腾柱无桥电路通过电流采样单元采集流经慢速桥臂单元的开关管的电流,并在采集到浪涌电流时通过浪涌保护单元控制所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管断开,实现对图腾柱无桥电路及电源模组的浪涌保护,该电路结构简单,反应速度快,其中,通过采集到的电流的变化量是否超过磁滞比较器的门限时,确定当前电流采样单元采集到的电流为浪涌电流。In order to solve the problem that the current totem pole bridgeless circuit cannot achieve surge protection, especially cannot protect against surge current formed by reverse lightning strike, the embodiment of the present application provides a totem pole bridgeless circuit and its surge protection method, and a power supply module. The totem pole bridgeless circuit collects the current flowing through the switch tube of the slow bridge arm unit through a current sampling unit, and controls the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected through the surge protection unit when the surge current is collected, so as to achieve surge protection for the totem pole bridgeless circuit and the power supply module. The circuit structure is simple and the response speed is fast. When the change in the collected current exceeds the threshold of the hysteresis comparator, it is determined that the current collected by the current sampling unit is a surge current.
具体地,下面结合附图,对本申请实施例作进一步阐述。Specifically, the embodiments of the present application are further described below in conjunction with the accompanying drawings.
实施例一Embodiment 1
本申请实施例提供了一种图腾柱无桥电路,请参见图1,其示出了本申请实施例提供的一种图腾柱无桥电路的结构框图,所述图腾柱无桥电路100包括:慢速桥臂单元110、快速桥臂单元120、交流输入单元130、电流采样单元140和浪涌保护单元150,所述图腾柱无桥电路100能够在所述浪涌保护单元150确定所述电流采样单元140采集到流经所 述慢速桥臂单元110的电流为浪涌电流时,通过浪涌保护单元150驱动所述慢速桥臂单元110和所述快速桥臂单元120中的开关管断开,从而实现浪涌保护。具体地,请一并参见图2,其示出了本申请实施例提供的一种图腾柱无桥电路的电路结构。The embodiment of the present application provides a totem pole bridgeless circuit. Please refer to FIG. 1, which shows a structural block diagram of a totem pole bridgeless circuit provided by the embodiment of the present application. The totem pole bridgeless circuit 100 includes: a slow bridge arm unit 110, a fast bridge arm unit 120, an AC input unit 130, a current sampling unit 140 and a surge protection unit 150. The totem pole bridgeless circuit 100 can determine that the current sampling unit 140 collects the current flowing through the surge protection unit 150. When the current of the slow bridge arm unit 110 is a surge current, the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 are driven to be disconnected by the surge protection unit 150, thereby realizing surge protection. Specifically, please refer to FIG. 2 , which shows a circuit structure of a totem pole bridgeless circuit provided in an embodiment of the present application.
所述慢速桥臂单元110,包括同向串联的第一慢速开关管SR1和第二慢速开关管SR2。且有,所述第一慢速开关管SR1和所述第二慢速开关管SR2的开关与所述交流电源AC的输出电压的频率同步。The slow bridge arm unit 110 includes a first slow switch tube SR1 and a second slow switch tube SR2 connected in series in the same direction, and the switching of the first slow switch tube SR1 and the second slow switch tube SR2 is synchronized with the frequency of the output voltage of the alternating current power source AC.
所述快速桥臂单元120,包括同向串联的第一快速开关管Q1和第二快速开关管Q2,所述快速桥臂单元120和所述慢速桥臂单元110并联连接。且有,所述第一快速开关管Q1和所述第二快速开关管Q2的反向恢复时间比所述第一慢速开关管SR1和所述第二慢速开关管SR2的反向恢复时间短。The fast bridge arm unit 120 includes a first fast switch tube Q1 and a second fast switch tube Q2 connected in series in the same direction, and the fast bridge arm unit 120 is connected in parallel with the slow bridge arm unit 110. In addition, the reverse recovery time of the first fast switch tube Q1 and the second fast switch tube Q2 is shorter than the reverse recovery time of the first slow switch tube SR1 and the second slow switch tube SR2.
在本申请实施例中,所述的“快速”、“慢速”为反向恢复时间上的相对的快慢,快速开关管的反向恢复时间比慢速开关管的导通电压更低,反向恢复时间更短、更快,能够在出现浪涌电流等需要关断桥臂上所有开关管时先断开与输出侧电路的连接,保护输出侧的电子元器件。且有,所述第一慢速开关管SR1和所述第二慢速开关管SR2、所述第一快速开关管Q1和所述第二快速开关管Q2可以是晶闸管、MOS管、IGBT管等功率开关器件,且慢速开关管和快速开关管可以是相同类型/型号的开关管,也可以是不同类型、不同型号的开关管,具体可根据实际需要进行选择。In the embodiment of the present application, the "fast" and "slow" are relative speeds in reverse recovery time. The reverse recovery time of the fast switch tube is lower than the conduction voltage of the slow switch tube, and the reverse recovery time is shorter and faster. When surge current occurs and all the switches on the bridge arm need to be turned off, the connection with the output side circuit can be disconnected first to protect the electronic components on the output side. In addition, the first slow switch tube SR1 and the second slow switch tube SR2, the first fast switch tube Q1 and the second fast switch tube Q2 can be power switch devices such as thyristors, MOS tubes, IGBT tubes, and the slow switch tube and the fast switch tube can be the same type/model switch tube, or different types and models of switch tubes, which can be selected according to actual needs.
所述交流输入单元130,其一端连接在所述第一慢速开关管SR1和所述第二慢速开关管SR2之间,其另一端连接在所述第一快速开关管Q1和所述第二快速开关管Q2之间。所述交流输入单元130用于接入交流电,并将接入的交流电输入至桥臂单元中进行电压变换。 The AC input unit 130 has one end connected between the first slow switch tube SR1 and the second slow switch tube SR2, and the other end connected between the first fast switch tube Q1 and the second fast switch tube Q2. The AC input unit 130 is used to receive AC power and input the received AC power into the bridge arm unit for voltage conversion.
具体地,请继续参见图2,所述交流输入单元130还包括:电磁干扰滤波器(Electromagnetic interference filter,EMI filter)EMI,其输入端与交流电源AC连接,其负极输出端连接在所述第一采样电阻RS1和所述第二采样电阻RS2之间;输入电感L1,其一端与所述电磁干扰滤波器EMI的正极输出端连接,其另一端连接在所述第一快速开关管Q1和所述第二快速开关管Q2之间。Specifically, please continue to refer to Figure 2, the AC input unit 130 also includes: an electromagnetic interference filter (EMI filter) EMI, whose input end is connected to the AC power supply AC, and whose negative output end is connected between the first sampling resistor RS1 and the second sampling resistor RS2; an input inductor L1, one end of which is connected to the positive output end of the electromagnetic interference filter EMI, and the other end of which is connected between the first fast switch tube Q1 and the second fast switch tube Q2.
所述电流采样单元140,包括第一采样电阻RS1和第二采样电阻RS2,所述第一采样电阻RS1连接在所述交流输入单元130和所述第二慢速开关管SR2之间,所述第二采样电阻RS2连接在所述交流输入单元130和所述第一慢速开关管SR1之间。本申请实施例通过使用采用电阻采集电力,相较于传统的采用霍尔传感器和隔离运放的方式,能够实现对电流的快速采样,进而实现快速保护。The current sampling unit 140 includes a first sampling resistor RS1 and a second sampling resistor RS2, wherein the first sampling resistor RS1 is connected between the AC input unit 130 and the second slow switch tube SR2, and the second sampling resistor RS2 is connected between the AC input unit 130 and the first slow switch tube SR1. Compared with the traditional method of using a Hall sensor and an isolation amplifier, the embodiment of the present application can achieve fast current sampling and thus fast protection by using a resistor to collect power.
所述浪涌保护单元150,其输入端CS与所述电流采样单元140连接,其输出端分别与所述慢速桥臂单元110和所述快速桥臂单元120连接,所述浪涌保护单元150配置为在通过所述电流采样单元140采集到浪涌电流时,控制所述第一慢速开关管SR1、所述第二慢速开关管SR2、所述第一快速开关管Q1和所述第二快速开关管Q2断开。The surge protection unit 150 has an input end CS connected to the current sampling unit 140, and an output end connected to the slow bridge arm unit 110 and the fast bridge arm unit 120 respectively. The surge protection unit 150 is configured to control the first slow switch tube SR1, the second slow switch tube SR2, the first fast switch tube Q1 and the second fast switch tube Q2 to be disconnected when a surge current is collected by the current sampling unit 140.
具体地,请继续参见图2,所述浪涌保护单元150包括:限流电阻R1、磁滞比较器U1、低通滤波器LPF和控制器CNTLR。其中,所述限流电阻R1,其一端与所述电流采样单元140连接;所述磁滞比较器U1,其正相输入端与所述限流电阻R1的另一端连接,所述磁滞比较器U1配置为在所述电流采样单元140采集到浪涌电流时输出高电平信号;所述低通滤波器LPF,其输入端与所述限流电阻R1的另一端连接,其输出端与所述磁滞比较器U1的反相输入端连接;所述控制器CNTLR,其输入端与所述磁滞比较器U1的输出端连接,其输出端分别与所述第一慢速开 关管SR1、所述第二慢速开关管SR2、所述第一快速开关管Q1和所述第二快速开关管Q2的控制端连接,且配置为在所述磁滞比较器U1输出高电平信号时驱动所述慢速桥臂单元110和所述快速桥臂单元120中的开关管断开,也即,控制所述第一慢速开关管SR1、所述第二慢速开关管SR2、所述第一快速开关管Q1和所述第二快速开关管Q2断开。在本申请实施例中,可通过所述磁滞比较器U1检测流经第一慢速开关管SR1、所述第二慢速开关管SR2的电流的变化率,所述磁滞比较器U1的参考门限为非固定值,通过低通滤波器LPF实现门限的调整,且所述磁滞比较器U1仅在输入端CS输入的电流信号快速增大时触发,能够有效防止误触发。在本申请实施例中,所述控制器CNTLR为一逻辑控制单元,能够在磁滞比较器U1输出高电平信号时输出低电平的脉冲宽度调制信号控制所述慢速桥臂单元110和所述快速桥臂单元120中的开关管断开。Specifically, please continue to refer to Figure 2. The surge protection unit 150 includes: a current limiting resistor R1, a hysteresis comparator U1, a low-pass filter LPF and a controller CNTLR. Among them, the current limiting resistor R1, one end of which is connected to the current sampling unit 140; the hysteresis comparator U1, its positive phase input end is connected to the other end of the current limiting resistor R1, and the hysteresis comparator U1 is configured to output a high-level signal when the current sampling unit 140 collects a surge current; the low-pass filter LPF, its input end is connected to the other end of the current limiting resistor R1, and its output end is connected to the inverting input end of the hysteresis comparator U1; the controller CNTLR, its input end is connected to the output end of the hysteresis comparator U1, and its output end is respectively connected to the first slow switch The control ends of the switch SR1, the second slow switch SR2, the first fast switch Q1 and the second fast switch Q2 are connected, and are configured to drive the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to be disconnected when the hysteresis comparator U1 outputs a high level signal, that is, to control the first slow switch SR1, the second slow switch SR2, the first fast switch Q1 and the second fast switch Q2 to be disconnected. In the embodiment of the present application, the change rate of the current flowing through the first slow switch SR1 and the second slow switch SR2 can be detected by the hysteresis comparator U1, the reference threshold of the hysteresis comparator U1 is a non-fixed value, and the threshold is adjusted by the low-pass filter LPF, and the hysteresis comparator U1 is only triggered when the current signal input at the input terminal CS increases rapidly, which can effectively prevent false triggering. In the embodiment of the present application, the controller CNTLR is a logic control unit, which can output a low-level pulse width modulation signal to control the switching tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to disconnect when the hysteresis comparator U1 outputs a high-level signal.
其中,请继续参见图2,所述低通滤波器LPF由一个CRC滤波电路组成,滤波带宽可以根据实际需求进行调整,所述低通滤波器LPF包括:滤波电阻R2,连接在所述限流电阻R1的另一端和所述磁滞比较器U1的反相输入端之间;第一滤波电容C2,其一端与所述限流电阻R1的另一端连接,其另一端接地;第二滤波电容C3,其一端与所述磁滞比较器U1的反相输入端连接,其另一端接地。Among them, please continue to refer to Figure 2. The low-pass filter LPF is composed of a CRC filter circuit. The filter bandwidth can be adjusted according to actual needs. The low-pass filter LPF includes: a filter resistor R2, connected between the other end of the current limiting resistor R1 and the inverting input end of the hysteresis comparator U1; a first filter capacitor C2, one end of which is connected to the other end of the current limiting resistor R1, and the other end of which is grounded; a second filter capacitor C3, one end of which is connected to the inverting input end of the hysteresis comparator U1, and the other end of which is grounded.
且有,在图2所示示例中,所述浪涌保护单元150的输入端CS连接在所述第一采样电阻RS1和所述第二慢速开关管SR2之间,所述第二采样电阻RS2与所述第一慢速开关管SR1连接的一端接地;或者,请参见图3,其示出了本申请实施例提供的另一种图腾柱无桥电路的电路结构,也可以是,所述浪涌保护单元150的输入端CS连接在所述第二采样电阻RS2和所述第一慢速开关管SR1之间,所述第一采样电阻RS1与所述第二慢速开关管SR2连接的一端接地。 In addition, in the example shown in FIG. 2 , the input end CS of the surge protection unit 150 is connected between the first sampling resistor RS1 and the second slow switch tube SR2, and one end of the second sampling resistor RS2 connected to the first slow switch tube SR1 is grounded; or, please refer to FIG. 3 , which shows a circuit structure of another totem pole bridgeless circuit provided in an embodiment of the present application, or the input end CS of the surge protection unit 150 is connected between the second sampling resistor RS2 and the first slow switch tube SR1, and one end of the first sampling resistor RS1 connected to the second slow switch tube SR2 is grounded.
在一些实施例中,请参见图4,其示出了本申请实施例提供的另一种图腾柱无桥电路的结构框图,所述图腾柱无桥电路100还包括:浪涌旁路单元160和交流输出单元170,所述浪涌旁路单元160与所述快速桥臂单元120和所述慢速桥臂单元110并联连接,所述交流输出单元170也与所述快速桥臂单元120和所述慢速桥臂单元110并联连接。In some embodiments, please refer to Figure 4, which shows a structural block diagram of another totem pole bridgeless circuit provided in an embodiment of the present application, the totem pole bridgeless circuit 100 also includes: a surge bypass unit 160 and an AC output unit 170, the surge bypass unit 160 is connected in parallel with the fast bridge arm unit 120 and the slow bridge arm unit 110, and the AC output unit 170 is also connected in parallel with the fast bridge arm unit 120 and the slow bridge arm unit 110.
具体地,请继续参见图2,所述浪涌旁路单元160包括同向串联的第一二极管D1和第二二极管D2,所述电磁干扰滤波器EMI的正极输出端连接在所述第一二极管D1的阴极和所述第二二极管D2的阳极之间。Specifically, please continue to refer to FIG. 2 , the surge bypass unit 160 includes a first diode D1 and a second diode D2 connected in series in the same direction, and the positive output end of the electromagnetic interference filter EMI is connected between the cathode of the first diode D1 and the anode of the second diode D2.
具体地,请继续参见图2,所述交流输出单元170包括:输出滤波电容C1,其与所述快速桥臂单元120和所述慢速桥臂单元110并联连接;输出负载RL,其与所述输出滤波电容C1并联连接。Specifically, please continue to refer to FIG. 2 , the AC output unit 170 includes: an output filter capacitor C1 connected in parallel with the fast bridge arm unit 120 and the slow bridge arm unit 110 ; and an output load RL connected in parallel with the output filter capacitor C1 .
本申请实施例提供的图腾柱无桥电路100正常工作时,请参见图5,其示出了以图2所示图腾柱无桥电路100的结构为示例,本申请实施例提供的图腾柱无桥电路100在交流电分别通过正、负半周供电时的储能回路和续流回路。具体地,When the totem pole bridgeless circuit 100 provided in the embodiment of the present application works normally, please refer to FIG. 5 , which shows the energy storage circuit and the freewheeling circuit of the totem pole bridgeless circuit 100 provided in the embodiment of the present application when the alternating current is supplied through the positive and negative half cycles respectively, taking the structure of the totem pole bridgeless circuit 100 shown in FIG. 2 as an example. Specifically,
请参见图5(a),其示出了图2所示图腾柱无桥电路100在交流电源AC输入正常且为交流电的正半周期时的储能回路,此时,第一快速开关管Q1是Boost升压电路的主管,第二快速开关管Q2是Boost升压电路的续流管,第一慢速开关管SR1保持开通,第二慢速开关管SR2保持关断;当第一快速开关管Q1闭合,第二快速开关管Q2断开时,输入电感L1、第一快速开关管Q1、第一慢速开关管SR1构成储能电路,交流电源AC对输入电感L1储能;且输出侧的输出滤波电容C1和输出负载RL也构成单独的电流回路。Please refer to Figure 5(a), which shows the energy storage circuit of the totem pole bridgeless circuit 100 shown in Figure 2 when the AC power supply AC input is normal and it is the positive half cycle of the AC power. At this time, the first fast switch tube Q1 is the main tube of the Boost boost circuit, the second fast switch tube Q2 is the freewheeling tube of the Boost boost circuit, the first slow switch tube SR1 remains on, and the second slow switch tube SR2 remains off; when the first fast switch tube Q1 is closed and the second fast switch tube Q2 is disconnected, the input inductor L1, the first fast switch tube Q1, and the first slow switch tube SR1 constitute an energy storage circuit, and the AC power supply AC stores energy in the input inductor L1; and the output filter capacitor C1 and the output load RL on the output side also constitute a separate current loop.
请参见图5(b),其示出了图2所示图腾柱无桥电路100在交流电源AC输入正常且为交流电的正半周期时的续流回路,此时,第一快速 开关管Q1是Boost升压电路的主管,第二快速开关管Q2是Boost升压电路的续流管,第一慢速开关管SR1保持开通,第二慢速开关管SR2保持关断;当第二快速开关管Q2闭合,第一快速开关管Q1断开时,输入电感L1、第二快速开关管Q2、第一慢速开关管SR1构成续流电路,输入电感L1和/或交流电源AC对负载端的输出滤波电容C1和输出负载RL释放能量。Please refer to FIG. 5( b ), which shows the freewheeling circuit of the totem pole bridgeless circuit 100 shown in FIG. 2 when the AC power supply AC input is normal and is in the positive half cycle of the AC power. At this time, the first fast The switch tube Q1 is the main tube of the Boost boost circuit, the second fast switch tube Q2 is the freewheeling tube of the Boost boost circuit, the first slow switch tube SR1 remains on, and the second slow switch tube SR2 remains off; when the second fast switch tube Q2 is closed and the first fast switch tube Q1 is disconnected, the input inductor L1, the second fast switch tube Q2, and the first slow switch tube SR1 form a freewheeling circuit, and the input inductor L1 and/or the AC power supply AC release energy to the output filter capacitor C1 and the output load RL at the load end.
请参见图5(c),其示出了图2所示图腾柱无桥电路100在交流电源AC输入正常且为交流电的负半周期时的储能回路,此时,第二快速开关管Q2是Boost升压电路的主管,第一快速开关管Q1是Boost升压电路的续流管,第一慢速开关管SR1保持关断,第二慢速开关管SR2保持开通;当第二快速开关管Q2闭合,第一快速开关管Q1断开时,第二慢速开关管SR2、第二快速开关管Q2、输入电感L1构成储能电路,交流电源AC对输入电感L1储能;且输出侧的输出滤波电容C1和输出负载RL也构成单独的电流回路。Please refer to Figure 5(c), which shows the energy storage circuit of the totem pole bridgeless circuit 100 shown in Figure 2 when the AC power supply AC input is normal and it is the negative half cycle of the AC power. At this time, the second fast switch tube Q2 is the main tube of the Boost boost circuit, the first fast switch tube Q1 is the freewheeling tube of the Boost boost circuit, the first slow switch tube SR1 remains turned off, and the second slow switch tube SR2 remains turned on; when the second fast switch tube Q2 is closed and the first fast switch tube Q1 is disconnected, the second slow switch tube SR2, the second fast switch tube Q2, and the input inductor L1 constitute an energy storage circuit, and the AC power supply AC stores energy in the input inductor L1; and the output filter capacitor C1 and the output load RL on the output side also constitute a separate current loop.
请参见图5(d),其示出了图2所示图腾柱无桥电路100在交流电源AC输入正常且为交流电的负半周期时的续流回路,此时,第二快速开关管Q2是Boost升压电路的主管,第一快速开关管Q1是Boost升压电路的续流管,第一慢速开关管SR1保持关断,第二慢速开关管SR2保持开通;当第一快速开关管Q1闭合,第二快速开关管Q2断开时,第二慢速开关管SR2、第一快速开关管Q1、输入电感L1构成续流电路,输入电感L1和/或交流电源AC对负载端的输出滤波电容C1和输出负载RL释放能量。Please refer to Figure 5(d), which shows the freewheeling circuit of the totem pole bridgeless circuit 100 shown in Figure 2 when the AC power supply AC input is normal and it is the negative half cycle of the AC power. At this time, the second fast switch tube Q2 is the main tube of the Boost boost circuit, the first fast switch tube Q1 is the freewheeling tube of the Boost boost circuit, the first slow switch tube SR1 remains turned off, and the second slow switch tube SR2 remains turned on; when the first fast switch tube Q1 is closed and the second fast switch tube Q2 is disconnected, the second slow switch tube SR2, the first fast switch tube Q1, and the input inductor L1 constitute a freewheeling circuit, and the input inductor L1 and/or the AC power supply AC release energy to the output filter capacitor C1 and the output load RL at the load end.
其中,在图5各图所示正常工作的情况下,电流采样单元140的输出端CS,也即浪涌保护单元150的输入端CS处的采集到的电流为负值,且电流变化率较小,磁滞比较器U1不会触发反转,控制器CNTLR也不 工作。5, the current collected at the output terminal CS of the current sampling unit 140, that is, the input terminal CS of the surge protection unit 150, is negative, and the current change rate is small, the hysteresis comparator U1 will not trigger the reversal, and the controller CNTLR will not Work.
本申请实施例提供的图腾柱无桥电路100在交流输入侧存在雷击产生的浪涌电流时,请参见图6,其示出了以图2所示图腾柱无桥电路100的结构为示例,本申请实施例提供的图腾柱无桥电路100在交流电分别通过正、负半周供电时产生的同相、反相雷击的浪涌电流路径。具体地,When there is a surge current caused by lightning strike on the AC input side of the totem pole bridgeless circuit 100 provided in the embodiment of the present application, please refer to FIG6, which shows the surge current paths of the same-phase and anti-phase lightning strikes generated by the totem pole bridgeless circuit 100 provided in the embodiment of the present application when the AC power is supplied through the positive and negative half cycles respectively, taking the structure of the totem pole bridgeless circuit 100 shown in FIG2 as an example. Specifically,
请参见图6(a),其示出了图2所示图腾柱无桥电路100在交流电源AC正半周期时刻的同相雷击的浪涌电流路径,此时,由于浪涌电流通过输入电感L1限制了浪涌电流的幅度,因此,所述浪涌保护单元150可以不需要控制所述慢速桥臂单元110和所述快速桥臂单元120中的开关管关断即可实现浪涌保护。可选地,为了保证进一步实现有效的浪涌保护,所述浪涌保护单元150也可以配置为控制所述慢速桥臂单元110和所述快速桥臂单元120中的开关管关断即可实现浪涌保护。Please refer to FIG6(a), which shows the surge current path of the totem pole bridgeless circuit 100 shown in FIG2 when the same-phase lightning strikes the AC positive half cycle. At this time, since the surge current limits the amplitude of the surge current through the input inductor L1, the surge protection unit 150 can achieve surge protection without controlling the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off. Optionally, in order to ensure further effective surge protection, the surge protection unit 150 can also be configured to control the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off to achieve surge protection.
请参见图6(b),其示出了图2所示图腾柱无桥电路100在交流电源AC正半周期时刻的反相雷击的浪涌电流路径,由于浪涌电流不经过输入电感L1,浪涌电流的幅度较大,容易损坏第一慢速开关管SR1。请一并参见图7(a),其示出了交流电源AC正半周期时刻的反相雷击下的电流采样和保护波形。在出现正半周反相雷击时,流经第一采样电阻RS1和第一慢速开关管SR1的电流I_SR1剧烈增加,电流采样单元140的输出端CS,也即浪涌保护单元150的输入端CS处的采集到的电流也跟着同步剧烈增大,并由正常状态的负电平快速变成正电平,电流变化率较大,导致磁滞比较器U1发生反转,磁滞比较器U1输出端Trig输出高电平信号驱动控制器CNTLR输出低电平的脉冲宽度调制(Pulse Width Modulation,PWM)信号至所述第一慢速开关管SR1和所述第一快速开关管Q1的控制端,快速关断所述第一慢速开关管SR1和所述第一快速开关管Q1,以实现浪涌保护。 Please refer to FIG6(b), which shows the surge current path of the totem pole bridgeless circuit 100 shown in FIG2 under reverse-phase lightning strike at the positive half cycle of the AC power supply AC. Since the surge current does not pass through the input inductor L1, the surge current has a large amplitude and is easy to damage the first slow switch tube SR1. Please also refer to FIG7(a), which shows the current sampling and protection waveform under reverse-phase lightning strike at the positive half cycle of the AC power supply AC. When a reverse-phase lightning strike occurs in the positive half cycle, the current I_SR1 flowing through the first sampling resistor RS1 and the first slow switch tube SR1 increases sharply, and the current collected at the output terminal CS of the current sampling unit 140, that is, the input terminal CS of the surge protection unit 150, also increases sharply synchronously, and quickly changes from a negative level in a normal state to a positive level. The current change rate is large, causing the hysteresis comparator U1 to reverse, and the output terminal Trig of the hysteresis comparator U1 outputs a high-level signal to drive the controller CNTLR to output a low-level pulse width modulation (PWM) signal to the control terminals of the first slow switch tube SR1 and the first fast switch tube Q1, and quickly turns off the first slow switch tube SR1 and the first fast switch tube Q1 to achieve surge protection.
请参见图6(c),其示出了图2所示图腾柱无桥电路100在交流电源AC负半周期时刻的同相雷击的浪涌电流路径,此时,由于浪涌电流通过输入电感L1限制了浪涌电流的幅度,因此,所述浪涌保护单元150可以不需要控制所述慢速桥臂单元110和所述快速桥臂单元120中的开关管关断即可实现浪涌保护。可选地,为了保证进一步实现有效的浪涌保护,所述浪涌保护单元150也可以配置为控制所述慢速桥臂单元110和所述快速桥臂单元120中的开关管关断即可实现浪涌保护。Please refer to FIG6(c), which shows the surge current path of the totem pole bridgeless circuit 100 shown in FIG2 when the same-phase lightning strike occurs at the negative half cycle of the AC power supply AC. At this time, since the surge current limits the amplitude of the surge current through the input inductor L1, the surge protection unit 150 can achieve surge protection without controlling the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off. Optionally, in order to ensure further effective surge protection, the surge protection unit 150 can also be configured to control the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off to achieve surge protection.
请参见图6(d),其示出了图2所示图腾柱无桥电路100在交流电源AC负半周期时刻的反相雷击的浪涌电流路径,此时,由于浪涌电流不经过输入电感L1,浪涌电流的幅度较大,容易损坏第二慢速开关管SR2,此时,所述浪涌保护单元150需要配置为控制所述慢速桥臂单元110和所述快速桥臂单元120中的开关管关断以实现浪涌保护。Please refer to Figure 6(d), which shows the surge current path of the totem pole bridgeless circuit 100 shown in Figure 2 during the reverse lightning strike at the negative half-cycle of the AC power supply AC. At this time, since the surge current does not pass through the input inductor L1, the surge current amplitude is large and it is easy to damage the second slow switch tube SR2. At this time, the surge protection unit 150 needs to be configured to control the switch tubes in the slow bridge arm unit 110 and the fast bridge arm unit 120 to turn off to achieve surge protection.
请参见图6(d),其示出了图2所示图腾柱无桥电路100在交流电源AC负半周期时刻的反相雷击的浪涌电流路径,由于浪涌电流不经过输入电感L1,浪涌电流的幅度较大,容易损坏第一慢速开关管SR1。请一并参见图7(b),其示出了交流电源AC负半周期时刻的反相雷击下的电流采样和保护波形。在出现负半周反相雷击时,流经第二采样电阻RS2和第二慢速开关管SR2的电流I_SR2剧烈增加,电流采样单元140的输出端CS,也即浪涌保护单元150的输入端CS处的采集到的电流也跟着同步剧烈增大,并由正常状态的负电平快速变成正电平,电流变化率较大,导致磁滞比较器U1发生反转,磁滞比较器U1输出端Trig输出高电平信号驱动控制器CNTLR输出低电平的脉冲宽度调制(Pulse Width Modulation,PWM)信号至所述第二慢速开关管SR2和所述第二快速开关管Q2的控制端,快速关断所述第二慢速开关管SR2和所述第二快速开关管Q2,以实现浪涌保护。 Please refer to Figure 6(d), which shows the surge current path of the totem pole bridgeless circuit 100 shown in Figure 2 under reverse lightning strike at the negative half cycle of the AC power supply AC. Since the surge current does not pass through the input inductor L1, the surge current has a large amplitude and is easy to damage the first slow switch tube SR1. Please also refer to Figure 7(b), which shows the current sampling and protection waveform under reverse lightning strike at the negative half cycle of the AC power supply AC. When a negative half-cycle reverse-phase lightning strike occurs, the current I_SR2 flowing through the second sampling resistor RS2 and the second slow switch tube SR2 increases dramatically, and the current collected at the output terminal CS of the current sampling unit 140, that is, the input terminal CS of the surge protection unit 150, also increases dramatically synchronously, and quickly changes from a negative level in a normal state to a positive level. The current change rate is large, causing the hysteresis comparator U1 to reverse, and the output terminal Trig of the hysteresis comparator U1 outputs a high-level signal to drive the controller CNTLR to output a low-level pulse width modulation (PWM) signal to the control terminals of the second slow switch tube SR2 and the second fast switch tube Q2, and quickly turns off the second slow switch tube SR2 and the second fast switch tube Q2 to achieve surge protection.
实施例二Embodiment 2
本申请实施例提供了一种图腾柱无桥电路的浪涌保护方法,该浪涌保护方法应用于如实施例一所述的图腾柱无桥电路,请参见图8,其示出了本申请实施例提供的一种浪涌保护方法,所述方法包括但不限于以下步骤:The embodiment of the present application provides a surge protection method for a totem pole bridgeless circuit. The surge protection method is applied to the totem pole bridgeless circuit as described in the first embodiment. Please refer to FIG8 , which shows a surge protection method provided by the embodiment of the present application, and the method includes but is not limited to the following steps:
步骤S10:通过电流采样单元采集经过慢速桥臂单元的电流;Step S10: collecting the current passing through the slow bridge arm unit through the current sampling unit;
具体地,在本申请实施例中,一并参见实施例一可知,可通过电流采样单元快速采集经过慢速桥臂单元的开关管的电流,从而在出现浪涌电流时,采集到浪涌电流,将采集到的电流输出至所述浪涌保护单元以实现浪涌的快速保护。Specifically, in the embodiments of the present application, referring to Embodiment 1, it can be known that the current passing through the switch tube of the slow bridge arm unit can be quickly collected by the current sampling unit, so that when a surge current occurs, the surge current is collected and the collected current is output to the surge protection unit to achieve rapid surge protection.
步骤S20:在采集到的电流的变化量超过磁滞比较器的门限时,浪涌保护单元控制慢速桥臂单元和快速桥臂单元中的开关管断开。Step S20: When the acquired current variation exceeds the threshold of the hysteresis comparator, the surge protection unit controls the switch tubes in the slow bridge arm unit and the fast bridge arm unit to be disconnected.
在本申请实施例中,通过如上实施例一图6各附图不难看出,当存在反相雷击时,容易烧毁第一慢速开关管或第二慢速开关管,因此,在电流采样单元采集到的电流的变化率超过磁滞比较器的门限时,快速触发保护,关闭相应的开关管,也即第一慢速开关管和第一快速开关管,或者,第二慢速开关管和第二快速开关管,实现浪涌保护。In the embodiment of the present application, it is not difficult to see from the figures of the above embodiment 1 Figure 6 that when there is a reverse-phase lightning strike, the first slow switch tube or the second slow switch tube is easily burned. Therefore, when the rate of change of the current collected by the current sampling unit exceeds the threshold of the hysteresis comparator, the protection is quickly triggered to close the corresponding switch tubes, that is, the first slow switch tube and the first fast switch tube, or the second slow switch tube and the second fast switch tube, to achieve surge protection.
实施例三Embodiment 3
本申请实施例提供了一种电源模组,请参见图9,其示出了本申请实施例提供的一种电源模组的硬件结构,所述电源模组10包括:如实施例一所述的图腾柱无桥电路100。An embodiment of the present application provides a power supply module. Please refer to Figure 9, which shows the hardware structure of a power supply module provided by an embodiment of the present application. The power supply module 10 includes: a totem pole bridgeless circuit 100 as described in Example 1.
在能源转换系统,如电源模组10中,采用本申请实施例一提供的图腾柱无桥电路100,能够实现对交流电源发生同相雷击和反相雷击时 的防护,实现浪涌保护。In an energy conversion system, such as a power module 10, the totem pole bridgeless circuit 100 provided in the first embodiment of the present application can be used to realize the protection of the AC power supply when the same-phase lightning strike and the opposite-phase lightning strike occur. protection to achieve surge protection.
本申请实施例中提供了一种图腾柱无桥电路及其浪涌保护方法、电源模组,该电路包括并联的慢速桥臂单元和快速桥臂单元,连接在慢速桥臂单元中两个开关管中点以及快速桥臂单元中两个开关管中点之间的交流输入单元,电流采样单元及浪涌保护单元,电流采样单元包括分别与慢速桥臂单元中两个开关管串联的采样电阻该电路能够在电流采样单元采集到浪涌电流时,通过浪涌保护单元控制所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管断开,实现对图腾柱无桥电路及电源模组的浪涌保护,且电路结构简单,反应速度快。In an embodiment of the present application, a totem pole bridgeless circuit and a surge protection method and a power supply module are provided. The circuit includes a slow bridge arm unit and a fast bridge arm unit connected in parallel, an AC input unit connected between the midpoints of two switch tubes in the slow bridge arm unit and the midpoints of two switch tubes in the fast bridge arm unit, a current sampling unit and a surge protection unit. The current sampling unit includes a sampling resistor connected in series with the two switch tubes in the slow bridge arm unit, respectively. When the current sampling unit collects a surge current, the circuit can control the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected through the surge protection unit, thereby realizing surge protection for the totem pole bridgeless circuit and the power supply module, and the circuit structure is simple and the response speed is fast.
需要说明的是,以上所描述的装置实施例仅仅是示意性的,其中所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,既可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现本实施例方案的目的。It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, and may be located in one place or distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
通过以上的实施方式的描述,本领域普通技术人员可以清楚地了解到各实施方式可借助软件加通用硬件平台的方式来实现,当然也可以通过硬件。本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程是可以通过计算机程序来指令相关的硬件来完成,所述的程序可存储于计算机可读取存储介质中,该程序在执行时,可包括如上述各方法的实施例的流程。其中,所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory,ROM)或随机存储记忆体(Random Access Memory,RAM)等。Through the description of the above implementation methods, a person of ordinary skill in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, can also be implemented by hardware. A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM) or a random access memory (RAM), etc.
最后应说明的是:以上实施例仅用以说明本发明的技术方案,而非 对其限制;在本发明的思路下,以上实施例或者不同实施例中的技术特征之间也可以进行组合,步骤可以任意顺序实现,并存在如上所述的本发明的不同方面的许多其他变化,为了简明,它们没有在细节中提供;尽管参照前述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。 Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, and are not intended to To limit it; under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity; although the present invention is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

  1. 一种图腾柱无桥电路,其特征在于,包括:A totem pole bridgeless circuit, characterized by comprising:
    慢速桥臂单元,包括同向串联的第一慢速开关管和第二慢速开关管;The slow bridge arm unit comprises a first slow switch tube and a second slow switch tube connected in series in the same direction;
    快速桥臂单元,包括同向串联的第一快速开关管和第二快速开关管,所述快速桥臂单元和所述慢速桥臂单元并联连接;A fast bridge arm unit comprises a first fast switch tube and a second fast switch tube connected in series in the same direction, and the fast bridge arm unit and the slow bridge arm unit are connected in parallel;
    交流输入单元,其一端连接在所述第一慢速开关管和所述第二慢速开关管之间,其另一端连接在所述第一快速开关管和所述第二快速开关管之间;an AC input unit, one end of which is connected between the first slow switch tube and the second slow switch tube, and the other end of which is connected between the first fast switch tube and the second fast switch tube;
    电流采样单元,包括第一采样电阻和第二采样电阻,所述第一采样电阻连接在所述交流输入单元和所述第二慢速开关管之间,所述第二采样电阻连接在所述交流输入单元和所述第一慢速开关管之间;A current sampling unit, comprising a first sampling resistor and a second sampling resistor, wherein the first sampling resistor is connected between the AC input unit and the second slow switching tube, and the second sampling resistor is connected between the AC input unit and the first slow switching tube;
    浪涌保护单元,其输入端与所述电流采样单元连接,其输出端分别与所述慢速桥臂单元和所述快速桥臂单元连接,所述浪涌保护单元配置为在通过所述电流采样单元采集到浪涌电流时,控制所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管断开。A surge protection unit, whose input end is connected to the current sampling unit, and whose output end is respectively connected to the slow bridge arm unit and the fast bridge arm unit, wherein the surge protection unit is configured to control the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube to be disconnected when a surge current is collected by the current sampling unit.
  2. 根据权利要求1所述的图腾柱无桥电路,其特征在于,所述浪涌保护单元包括:The totem pole bridgeless circuit according to claim 1, characterized in that the surge protection unit comprises:
    限流电阻,其一端与所述电流采样单元连接;A current limiting resistor, one end of which is connected to the current sampling unit;
    磁滞比较器,其正相输入端与所述限流电阻的另一端连接,所述磁滞比较器配置为在所述电流采样单元采集到浪涌电流时输出高电平信号; A hysteresis comparator, whose non-phase input terminal is connected to the other end of the current limiting resistor, and the hysteresis comparator is configured to output a high level signal when the current sampling unit collects the surge current;
    低通滤波器,其输入端与所述限流电阻的另一端连接,其输出端与所述磁滞比较器的反相输入端连接;A low-pass filter, whose input end is connected to the other end of the current-limiting resistor, and whose output end is connected to the inverting input end of the hysteresis comparator;
    控制器,其输入端与所述磁滞比较器的输出端连接,其输出端分别与所述第一慢速开关管、所述第二慢速开关管、所述第一快速开关管和所述第二快速开关管的控制端连接,且配置为在所述磁滞比较器输出高电平信号时驱动所述慢速桥臂单元和所述快速桥臂单元中的开关管断开。A controller, whose input end is connected to the output end of the hysteresis comparator, and whose output end is respectively connected to the control ends of the first slow switch tube, the second slow switch tube, the first fast switch tube and the second fast switch tube, and is configured to drive the switch tubes in the slow bridge arm unit and the fast bridge arm unit to disconnect when the hysteresis comparator outputs a high-level signal.
  3. 根据权利要求2所述的图腾柱无桥电路,其特征在于,所述低通滤波器包括:The totem pole bridgeless circuit according to claim 2, characterized in that the low-pass filter comprises:
    滤波电阻,连接在所述限流电阻的另一端和所述磁滞比较器的反相输入端之间;A filter resistor connected between the other end of the current limiting resistor and the inverting input end of the hysteresis comparator;
    第一滤波电容,其一端与所述限流电阻的另一端连接,其另一端接地;A first filter capacitor, one end of which is connected to the other end of the current limiting resistor, and the other end of which is grounded;
    第二滤波电容,其一端与所述磁滞比较器的反相输入端连接,其另一端接地。A second filter capacitor has one end connected to the inverting input end of the hysteresis comparator and the other end grounded.
  4. 根据权利要求2所述的图腾柱无桥电路,其特征在于,The totem pole bridgeless circuit according to claim 2 is characterized in that:
    所述浪涌保护单元的输入端连接在所述第一采样电阻和所述第二慢速开关管之间,所述第二采样电阻与所述第一慢速开关管连接的一端接地,The input end of the surge protection unit is connected between the first sampling resistor and the second slow switch tube, and one end of the second sampling resistor connected to the first slow switch tube is grounded.
    或者,or,
    所述浪涌保护单元的输入端连接在所述第二采样电阻和所述第一慢速开关管之间,所述第一采样电阻与所述第二慢速开关管连接的一端接地。 The input end of the surge protection unit is connected between the second sampling resistor and the first slow switch tube, and one end of the first sampling resistor connected to the second slow switch tube is grounded.
  5. 根据权利要求1-4任一项所述的图腾柱无桥电路,其特征在于,所述交流输入单元还包括:The totem pole bridgeless circuit according to any one of claims 1 to 4, characterized in that the AC input unit further comprises:
    电磁干扰滤波器,其输入端与交流电源连接,其负极输出端连接在所述第一采样电阻和所述第二采样电阻之间;An electromagnetic interference filter, whose input end is connected to an AC power supply, and whose negative output end is connected between the first sampling resistor and the second sampling resistor;
    输入电感,其一端与所述电磁干扰滤波器的正极输出端连接,其另一端连接在所述第一快速开关管和所述第二快速开关管之间。An input inductor, one end of which is connected to the positive output end of the electromagnetic interference filter, and the other end of which is connected between the first fast switch tube and the second fast switch tube.
  6. 根据权利要求5所述的图腾柱无桥电路,其特征在于,所述图腾柱无桥电路还包括:The totem pole bridgeless circuit according to claim 5, characterized in that the totem pole bridgeless circuit further comprises:
    浪涌旁路单元,其与所述快速桥臂单元和所述慢速桥臂单元并联连接,所述浪涌旁路单元包括同向串联的第一二极管和第二二极管,所述电磁干扰滤波器的正极输出端连接在所述第一二极管的阴极和所述第二二极管的阳极之间。A surge bypass unit is connected in parallel with the fast bridge arm unit and the slow bridge arm unit. The surge bypass unit includes a first diode and a second diode connected in series in the same direction. The positive output end of the electromagnetic interference filter is connected between the cathode of the first diode and the anode of the second diode.
  7. 根据权利要求5所述的图腾柱无桥电路,其特征在于,The totem pole bridgeless circuit according to claim 5 is characterized in that:
    所述第一慢速开关管和所述第二慢速开关管的开关与所述交流电源的输出电压的频率同步,The switching of the first slow switching tube and the second slow switching tube is synchronized with the frequency of the output voltage of the AC power supply.
    所述第一快速开关管和所述第二快速开关管的反向恢复时间比所述第一慢速开关管和所述第二慢速开关管的反向恢复时间短。The reverse recovery time of the first fast switch tube and the second fast switch tube is shorter than the reverse recovery time of the first slow switch tube and the second slow switch tube.
  8. 根据权利要求7所述的图腾柱无桥电路,其特征在于,所述图腾柱无桥电路还包括:The totem pole bridgeless circuit according to claim 7, characterized in that the totem pole bridgeless circuit further comprises:
    交流输出单元,其与所述快速桥臂单元和所述慢速桥臂单元并联连接,其中,所述交流输出单元包括: An AC output unit, which is connected in parallel with the fast bridge arm unit and the slow bridge arm unit, wherein the AC output unit comprises:
    输出滤波电容,其与所述快速桥臂单元和所述慢速桥臂单元并联连接;An output filter capacitor connected in parallel with the fast bridge arm unit and the slow bridge arm unit;
    输出负载,其与所述输出滤波电容并联连接。An output load is connected in parallel with the output filter capacitor.
  9. 一种图腾柱无桥电路的浪涌保护方法,其特征在于,应用于如权利要求1-8任一项所述的图腾柱无桥电路,所述方法包括:A surge protection method for a totem pole bridgeless circuit, characterized in that it is applied to the totem pole bridgeless circuit according to any one of claims 1 to 8, and the method comprises:
    通过电流采样单元采集经过慢速桥臂单元的电流;The current passing through the slow bridge arm unit is collected by a current sampling unit;
    在采集到的电流的变化量超过磁滞比较器的门限时,浪涌保护单元控制慢速桥臂单元和快速桥臂单元中的开关管断开。When the variation of the collected current exceeds the threshold of the hysteresis comparator, the surge protection unit controls the switch tubes in the slow bridge arm unit and the fast bridge arm unit to be disconnected.
  10. 一种电源模组,其特征在于,包括:如权利要求1-8任一项所述的图腾柱无桥电路。 A power supply module, characterized by comprising: a totem pole bridgeless circuit as described in any one of claims 1-8.
PCT/CN2023/125272 2022-10-28 2023-10-18 Totem-pole bridgeless circuit, surge protection method thereof and power supply module WO2024088139A1 (en)

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