CN210327414U - Inverter circuit - Google Patents
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- CN210327414U CN210327414U CN201921347370.7U CN201921347370U CN210327414U CN 210327414 U CN210327414 U CN 210327414U CN 201921347370 U CN201921347370 U CN 201921347370U CN 210327414 U CN210327414 U CN 210327414U
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Abstract
The utility model discloses an inverter circuit, which comprises a DC-DC conversion circuit, a DC-AC conversion circuit and a starting circuit; the first upper bridge arm module comprises a switching tube M1, a first boosting unit and a first discharging unit; the second upper bridge arm module comprises a switching tube M2, a second boost unit and a second bleeder unit. The utility model provides a DC-AC converting circuit, through the first setting that steps up of unit and second that steps up, improve the driving force of first PWM control module to switch tube M1 and switch tube M2, the setting through first unit and the second unit of bleeding simultaneously, electric capacity and switch tube M2 grid and source electrode electric capacity discharge's speed between switch tube M1 grid and source electrode have been increaseed, thereby improve switch tube M1 and switch tube M2's turn-off speed, guarantee the quality of DC-AC converting circuit output alternating current.
Description
Technical Field
The utility model relates to an electronic circuit technical field, more specifically say and relate to an inverter circuit structure.
Background
The inverter circuit converts direct current with a certain amplitude into alternating current with a certain amplitude and a certain frequency so as to supply power to electric equipment. The existing inverter circuit mainly comprises the following processes of firstly converting direct current into high-frequency low-voltage alternating current, then converting the high-frequency low-voltage alternating current into high-frequency high-voltage alternating current, then converting the high-frequency high-voltage alternating current into high-voltage direct current, and finally converting the high-voltage direct current into alternating current with specific frequency according to the requirement.
The inverter circuit in the prior art has the following defects that because high-voltage direct current is converted into alternating current with specific frequency at present, a full-bridge inverter circuit is generally adopted and comprises two upper bridge arms and two lower bridge arms, and the two upper bridge arms and the two lower bridge arms are respectively conducted in a circulating mode, so that the direction of the direct current is changed. Because the switching tube of the upper bridge arm is in a suspended state, a driving circuit of the switching tube of the upper bridge arm and a driving circuit of the switching tube of the lower bridge arm need to be designed respectively, and a traditional inverter circuit cannot improve the turn-off speed of the switching tube of the upper bridge arm, so that the quality of alternating current output by the DC-AC conversion circuit is influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: an inverter circuit structure is provided.
The utility model provides a solution of its technical problem is:
an inverter circuit comprising:
the DC-DC conversion circuit is used for converting input low-voltage direct current into high-frequency low-voltage alternating current, converting the high-frequency low-voltage alternating current into high-frequency high-voltage alternating current and finally converting the high-frequency high-voltage alternating current into high-voltage direct current;
a DC-AC conversion circuit for converting the high-voltage direct current into a high-voltage alternating current of a specific frequency;
the starting circuit is used for supplying power to the DC-DC conversion circuit and the DC-AC conversion circuit;
the DC-DC conversion circuit is connected with the DC-AC conversion circuit, and the starting circuit is respectively connected with the DC-DC conversion circuit and the DC-AC conversion circuit;
the DC-AC conversion circuit comprises a first PWM control module, a first upper bridge arm module, a second upper bridge arm module, a first lower bridge arm module and a second lower bridge arm module, wherein a plurality of output ends of the first PWM control module are respectively connected with the first upper bridge arm module, the second upper bridge arm module, the first lower bridge arm module and the second lower bridge arm module; the first upper bridge arm module and the second upper bridge arm module are respectively connected with a DC-DC conversion circuit, and the first lower bridge arm module and the second lower bridge arm module are respectively connected with a ground end;
the first upper bridge arm module comprises a switching tube M1, a first boosting unit for increasing voltage between a grid electrode and a source electrode of the switching tube M1, and a first bleeder unit for accelerating discharge of a capacitor between the grid electrode and the source electrode of the switching tube M1;
the second upper bridge arm module comprises a switching tube M2, a second boosting unit for increasing voltage between the grid electrode and the source electrode of the switching tube M2, and a second discharging unit for accelerating discharge of a capacitor between the grid electrode and the source electrode of the switching tube M2;
the grid electrode of the switching tube M1 and the grid electrode of the switching tube M2 are respectively connected with the output end of the first PWM control module, and the drain electrode of the switching tube M1 and the drain electrode of the switching tube M2 are respectively connected with the DC-DC conversion circuit.
As a further improvement of the above technical solution, the first voltage boosting unit includes a diode D1 and a capacitor C1, an anode of the diode D1 is connected to a power supply terminal, a cathode of the diode D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to a source of a switching tube M1, and a gate of the switching tube M1 is connected to a cathode of the diode D1;
the second boosting unit comprises a diode D3 and a capacitor C2, the anode of the diode D3 is connected with a power supply end, the cathode of the diode D3 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the source of a switching tube M2, and the gate of the switching tube M2 is connected with the cathode of the diode D3.
As a further improvement of the above technical solution, the first bleeding unit includes a transistor Q1, a diode D2, and a resistor R1, an anode and a cathode of the diode D2 are respectively connected to a base and an emitter of the transistor Q1, an anode of the diode D2 is connected to a cathode of a diode D1, an emitter of the transistor Q1 is connected to a gate of the switching tube M1 through a resistor R1, and a collector of the transistor Q1 is connected to a source of the switching tube M1;
the second bleeder unit comprises a triode Q2, a diode D4 and a resistor R2, wherein the anode and the cathode of the diode D4 are respectively connected with the base electrode and the emitter electrode of the triode Q2, the anode of the diode D4 is connected with the cathode of a diode D3, the emitter electrode of the triode Q2 is connected with the grid electrode of the switching tube M2 through the resistor R2, and the collector electrode of the triode Q2 is connected with the source electrode of the switching tube M2.
As a further improvement of the above technical solution, the first upper bridge arm module further includes a first photocoupler U1, an input end of the first photocoupler U1 is connected to an output end of the first PWM control module, and an output end of the first photocoupler U1 controls connection between a negative electrode of the diode D1 and a positive electrode of the diode D2;
the second upper bridge arm module further comprises a second photoelectric coupler U2, the input end of the second photoelectric coupler U2 is connected with the output end of the first PWM control module, and the output end of the second photoelectric coupler U2 controls connection between the negative electrode of the diode D3 and the positive electrode of the diode D4.
As a further improvement of the above technical solution, the DC-DC conversion circuit includes:
the high-frequency transformer is used for converting high-frequency low-voltage alternating current into high-frequency high-voltage alternating current, a first winding and a second winding are arranged on the input side of the high-frequency transformer, and one end of the first winding and one end of the second winding are connected together to form an intermediate node;
the rectifier module is used for converting alternating current into direct current;
the first switch module is used for controlling the circulation of the direct current in a first winding of the high-frequency transformer;
the second switch module is used for controlling the circulation of the direct current in a second winding of the high-frequency transformer;
the second PWM control module is used for transmitting two groups of complementary PWM signals to the first switch module and the second switch module respectively;
the second PWM control module is respectively connected with a first switch module and a second switch module, the first switch module is connected with a first winding of the high-frequency transformer, the second switch module is connected with a second winding of the high-frequency transformer, the output side of the high-frequency transformer is connected with a rectifying module, and the rectifying module is connected with the DC-AC conversion circuit;
the first switch module comprises a first totem pole drive consisting of a triode Q7 and a triode Q8 and a switch tube M5, the second PWM control module is connected with the input end of the first totem pole drive, the output end of the first totem pole drive is connected with the grid electrode of the switch tube M5, and the source electrode and the drain electrode of the switch tube M5 are respectively connected with the first winding of the high-frequency transformer and the ground end;
the second switch module comprises a second totem pole drive composed of a triode Q9 and a triode Q10, and a switch tube M6, the second PWM control module is connected to an input end of the second totem pole drive, an output end of the second totem pole drive is connected to a gate of the switch tube M6, and a source and a drain of the switch tube M6 are respectively connected to a second winding of the high-frequency transformer and a ground terminal.
As a further improvement of the above technical solution, an input end of the second PWM control module is connected to the rectifying module, and the second PWM control module is configured to control duty ratios of PWM signals output by the second PWM control module to the first switching module and the second switching module according to a dc voltage amplitude output by the rectifying module.
As a further improvement of the above technical solution, the second PWM control module includes a controller chip of SG3525 type and a peripheral circuit thereof, an input terminal of the controller chip is connected to the rectification module, and two output terminals of the controller chip are respectively connected to the first switch module and the second switch module.
As a further improvement of the above technical solution, the boot circuit includes:
the direct current voltage stabilizing module is used for carrying out voltage reduction operation on input direct current voltage with a certain amplitude, converting the input direct current voltage into direct current voltage with another amplitude and outputting the direct current voltage;
the starting module is used for transmitting starting current to the direct current voltage stabilizing module;
the direct current voltage stabilizing module comprises a capacitor C5, a voltage reducing chip and peripheral circuits thereof, wherein the voltage reducing chip is provided with a power supply end and a ground end, two ends of the capacitor C5 are respectively connected with the power supply end and the ground end of the voltage reducing chip, the ground end of the voltage reducing chip is connected with the ground end, the starting module is connected with the capacitor C5 and used for increasing the charging current of the capacitor C5, and the direct current voltage stabilizing module is respectively connected with each DC-DC conversion circuit and each DC-AC conversion circuit.
As a further improvement of the above technical solution, the starting module includes a resistor R13, a resistor R14, a transistor Q11, a resistor R15, a resistor R16, a transistor Q12, a capacitor C6, a resistor R17, and a transistor Q13, the resistor R13 and the resistor R14 are connected in series between a power supply terminal and a ground terminal, a base and an emitter of the transistor Q11 are respectively connected to two terminals of the resistor R13, a base of the transistor Q11 is connected to a connection point between the resistor R13 and the resistor R14, a collector of the transistor Q11 is connected to the ground terminal through the resistor R15 and the resistor R16 connected in series, a base of the transistor Q12 is connected to a connection point between the resistor R15 and the resistor R16, an emitter of the transistor Q12 is connected to the ground terminal, a collector of the transistor Q12 is connected to the base of the transistor Q13 through the resistor R17, two terminals of the capacitor C6 are respectively connected to the emitter of the transistor Q13 and, the emitter of the transistor Q13 is connected to the emitter of the transistor Q11, and the collector of the transistor Q13 is connected to ground through a capacitor C5.
As a further improvement of the above technical solution, the power-on circuit further includes an auxiliary power-on module, the auxiliary power-on module is connected to the start module, and the auxiliary power-on module is configured to control the start module to switch on the power-on loop according to the received external control signal; the auxiliary power-on module comprises a resistor R18, a resistor R19 and a triode Q14, the auxiliary power-on module is provided with a signal input end used for receiving an external control signal, the signal input end is connected with the base electrode of the triode Q14 through a resistor R18, two ends of the resistor R19 are respectively connected with the base electrode and the emitting electrode of the triode Q14, the emitting electrode of the triode Q14 is connected with the ground end, and the collector electrode of the triode Q14 is connected with the starting module.
The utility model has the advantages that: the utility model provides a DC-AC converting circuit, through the first setting that steps up of unit and second that steps up, improve the driving force of first PWM control module to switch tube M1 and switch tube M2, the setting through first unit and the second unit of bleeding simultaneously, electric capacity and switch tube M2 grid and source electrode electric capacity discharge's speed between switch tube M1 grid and source electrode have been increaseed, thereby improve switch tube M1 and switch tube M2's turn-off speed, guarantee the quality of DC-AC converting circuit output alternating current.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.
Fig. 1 is a circuit module frame diagram of the present invention;
fig. 2 is a schematic circuit diagram of a first upper leg module, a second upper leg module, a first lower leg module, and a second lower leg module of the present invention;
fig. 3 is a schematic circuit diagram of a first PWM control module of the present invention;
fig. 4 is a schematic circuit diagram of the first switch module, the second switch module, the high-frequency transformer, and the rectifier module of the present invention;
fig. 5 is a schematic circuit diagram of a second PWM control module of the present invention;
fig. 6 is a circuit schematic diagram of the power-on circuit of the present invention.
Detailed Description
The conception, specific structure, and technical effects of the present application will be described clearly and completely with reference to the accompanying drawings and embodiments, so that the purpose, features, and effects of the present application can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts based on the embodiments of the present application belong to the protection scope of the present application. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other. Finally, it should be noted that the terms "center, upper, lower, left, right, vertical, horizontal, inner, outer" and the like as used herein refer to an orientation or positional relationship based on the drawings, which is only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Referring to fig. 1 to 3, the present application discloses an inverter circuit, a first embodiment of which includes:
the DC-DC conversion circuit is used for converting input low-voltage direct current into high-frequency low-voltage alternating current, converting the high-frequency low-voltage alternating current into high-frequency high-voltage alternating current and finally converting the high-frequency high-voltage alternating current into high-voltage direct current;
a DC-AC conversion circuit for converting the high-voltage direct current into a high-voltage alternating current of a specific frequency;
the starting circuit is used for supplying power to the DC-DC conversion circuit and the DC-AC conversion circuit;
the DC-DC conversion circuit is connected with the DC-AC conversion circuit, and the starting circuit is respectively connected with the DC-DC conversion circuit and the DC-AC conversion circuit;
the DC-AC conversion circuit comprises a first PWM control module, a first upper bridge arm module, a second upper bridge arm module, a first lower bridge arm module and a second lower bridge arm module, wherein a plurality of output ends of the first PWM control module are respectively connected with the first upper bridge arm module, the second upper bridge arm module, the first lower bridge arm module and the second lower bridge arm module; the first upper bridge arm module and the second upper bridge arm module are respectively connected with a DC-DC conversion circuit, and the first lower bridge arm module and the second lower bridge arm module are respectively connected with a ground end;
the first upper bridge arm module comprises a switching tube M1, a first boosting unit for increasing voltage between a grid electrode and a source electrode of the switching tube M1, and a first bleeder unit for accelerating discharge of a capacitor between the grid electrode and the source electrode of the switching tube M1;
the second upper bridge arm module comprises a switching tube M2, a second boosting unit for increasing voltage between the grid electrode and the source electrode of the switching tube M2, and a second discharging unit for accelerating discharge of a capacitor between the grid electrode and the source electrode of the switching tube M2;
the grid electrode of the switching tube M1 and the grid electrode of the switching tube M2 are respectively connected with the output end of the first PWM control module, and the drain electrode of the switching tube M1 and the drain electrode of the switching tube M2 are respectively connected with the DC-DC conversion circuit.
Specifically, in the DC-AC conversion circuit in this embodiment, the driving capability of the first PWM control module to the switching tube M1 and the switching tube M2 is improved through the arrangement of the first boosting unit and the second boosting unit, and the discharging speed of the capacitance between the gate and the source of the switching tube M1 and the capacitance between the gate and the source of the switching tube M2 is increased through the arrangement of the first bleeding unit and the second bleeding unit, so that the turn-off speed of the switching tube M1 and the switching tube M2 is improved, and the quality of the output alternating current of the DC-AC conversion circuit is ensured.
Further, in this embodiment, the first voltage boosting unit includes a diode D1 and a capacitor C1, the anode of the diode D1 is connected to the power supply terminal, the cathode of the diode D1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to the source of a switch tube M1, and the gate of the switch tube M1 is connected to the cathode of the diode D1; the second boosting unit comprises a diode D3 and a capacitor C2, the anode of the diode D3 is connected with a power supply end, the cathode of the diode D3 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the source of a switching tube M2, and the gate of the switching tube M2 is connected with the cathode of the diode D3.
The first boosting unit is used as an analysis object for explanation, and the analysis process of the second boosting unit is similar. In the first voltage boosting unit, the diode D1 is used as a bootstrap diode, the capacitor C1 is used as a bootstrap capacitor, and the potential at the connection point of the diode D1 and the capacitor C1 is increased by using the principle that the voltages at the two ends of the capacitor cannot change suddenly, so that the voltage between the gate and the source of the switching tube M1 is increased, and the driving capability of the first PWM control module to the switching tube M1 is increased.
Further, in this embodiment, the first bleeding unit includes a transistor Q1, a diode D2, a resistor R20, and a resistor R1, an anode and a cathode of the diode D2 are respectively connected to a base and an emitter of the transistor Q1, an anode of the diode D2 is connected to a cathode of the diode D1, an emitter of the transistor Q1 is connected to a gate of the switching tube M1 through a resistor R1, a collector of the transistor Q1 is connected to a source of the switching tube M1, and two ends of the resistor R20 are respectively connected to a base and a collector of the transistor Q1; the second bleeder unit comprises a triode Q2, a diode D4, a resistor R21 and a resistor R2, wherein the anode and the cathode of the diode D4 are respectively connected with the base and the emitter of the triode Q2, the anode of the diode D4 is connected with the cathode of the diode D3, the emitter of the triode Q2 is connected with the gate of the switching tube M2 through a resistor R2, the collector of the triode Q2 is connected with the source of the switching tube M2, and two ends of the resistor R21 are respectively connected with the base and the collector of the triode Q2.
The first bleeding unit is used as an analysis object for explanation, and the analysis process of the second bleeding unit is similar. In the first bleeder unit, when the switching tube M1 needs to be turned off, the transistor Q1 is turned on, the capacitor between the gate and the source of the switching tube M1 performs a discharging operation through the transistor Q1, the discharging current of the capacitor between the gate and the source of the switching tube M1 is increased through the arrangement of the transistor Q1, and the voltage between the gate and the source of the switching tube M1 is decreased at a higher speed, so that the turn-off time of the switching tube M1 is increased.
Further, as a preferred implementation manner, in this embodiment, the first PWM control module specifically uses an isolation driving manner to implement an isolation driving function for the switching tube M1 and the switching tube M2, so as to ensure the safety of the entire DC-AC conversion circuit. In this embodiment, the first upper bridge arm module further includes a first photoelectric coupler U1, an input end of the first photoelectric coupler U1 is connected to an output end of the first PWM control module, and an output end of the first photoelectric coupler U1 controls connection between a negative electrode of the diode D1 and a positive electrode of the diode D2; the second upper bridge arm module further comprises a second photoelectric coupler U2, the input end of the second photoelectric coupler U2 is connected with the output end of the first PWM control module, and the output end of the second photoelectric coupler U2 controls connection between the negative electrode of the diode D3 and the positive electrode of the diode D4.
Further as a preferred embodiment, in this embodiment, the first lower bridge arm module includes a switching tube M3, a transistor Q3, a transistor Q4, a resistor R3, a resistor R4, and a resistor R5, an output end of the first PWM control module is connected to a base of a transistor Q3, an emitter of the transistor Q3 is connected to ground, a base of the transistor Q4 is connected to a power supply terminal through a resistor R3 and a resistor R4 connected in series, a collector of the transistor Q3 is connected between the resistor R3 and the resistor R4, an emitter of the transistor Q4 is connected to ground, a collector of the transistor Q4 is connected to the power supply terminal through a resistor R5, and a collector of the transistor Q4 is connected to a gate of the switching tube M3; the second lower bridge arm module comprises a switching tube M4, a triode Q5, a triode Q6, a resistor R6, a resistor R7 and a resistor R8, the output end of the first PWM control module is connected with the base electrode of the triode Q5, the emitter electrode of the triode Q5 is connected with the ground end, the base electrode of the triode Q6 is connected with a power supply end through a resistor R6 and a resistor R7 which are connected in series, the collector electrode of the triode Q5 is connected between the resistor R6 and the resistor R7, the emitter electrode of the triode Q6 is connected with the ground end, the collector electrode of the triode Q6 is connected with the power supply end through a resistor R8, and the collector electrode of the triode Q6 is connected with the gate electrode of the switching tube M4.
Specifically, in the first lower bridge arm module and the second lower bridge arm module of this embodiment, the driving capability of the first PWM control module to the switching tube M3 and the switching tube M4 is improved through the arrangement of the transistor Q3 and the transistor Q4, and the transistor Q5 and the transistor Q6.
Referring to fig. 4 and 5, further as a preferred embodiment, in this embodiment, the DC-DC conversion circuit includes:
the high-frequency transformer is used for converting high-frequency low-voltage alternating current into high-frequency high-voltage alternating current, a first winding and a second winding are arranged on the input side of the high-frequency transformer, one end of the first winding and one end of the second winding are connected together to form an intermediate node, and the intermediate node is used for being connected with an external direct current power supply;
the rectifier module is used for converting alternating current into direct current;
the first switch module is used for controlling the circulation of the direct current in a first winding of the high-frequency transformer;
the second switch module is used for controlling the circulation of the direct current in a second winding of the high-frequency transformer;
the second PWM control module is used for transmitting two groups of complementary PWM signals to the first switch module and the second switch module respectively;
the second PWM control module is respectively connected with a first switch module and a second switch module, the first switch module is connected with a first winding of the high-frequency transformer, the second switch module is connected with a second winding of the high-frequency transformer, the output side of the high-frequency transformer is connected with a rectifying module, and the rectifying module is connected with the DC-AC conversion circuit;
the first switch module comprises a first totem pole drive consisting of a triode Q7 and a triode Q8 and a switch tube M5, the second PWM control module is connected with the input end of the first totem pole drive, the output end of the first totem pole drive is connected with the grid electrode of the switch tube M5, and the source electrode and the drain electrode of the switch tube M5 are respectively connected with the first winding of the high-frequency transformer and the ground end;
the second switch module comprises a second totem pole drive composed of a triode Q9 and a triode Q10, and a switch tube M6, the second PWM control module is connected to an input end of the second totem pole drive, an output end of the second totem pole drive is connected to a gate of the switch tube M6, and a source and a drain of the switch tube M6 are respectively connected to a second winding of the high-frequency transformer and a ground terminal.
In this embodiment, the transistor Q7 of the first switching module is an NPN transistor, the transistor Q8 is a PNP transistor, the output end of the second PWM control module is respectively connected to the base of the transistor Q7 and the base of the transistor Q8, the emitter of the transistor Q7 is connected to the emitter of the transistor Q8, the collector of the transistor Q7 is connected to a power supply terminal, the collector of the transistor Q8 is connected to a ground terminal, and the emitter of the transistor Q7 and the emitter of the transistor Q8 are both connected to the gate of the switching tube M5; the triode Q9 of the second switching module is an NPN type triode, the triode Q10 is a PNP type triode, the output end of the second PWM control module is respectively connected to the base of the triode Q9 and the base of the triode Q10, the emitter of the triode Q9 is connected to the emitter of the triode Q10, the collector of the triode Q9 is connected to the power supply terminal, the collector ground terminal of the triode Q10, the emitter of the triode Q9 and the emitter of the triode Q10 are both connected to the gate of the switching tube M6. When the second PWM control module controls the switch transistor M5 to be turned on and the switch transistor M6 to be turned off, the current output by the external dc power supply flows to the ground through the first winding of the high frequency transformer and the switch transistor M5 to form a loop, and when the second PWM control module controls the switch transistor M5 to be turned off and the switch transistor M6 to be turned on, the current output by the external dc power supply flows to the ground through the second winding of the high frequency transformer and the switch transistor M5 to form a loop.
Specifically, in the present embodiment, by respectively providing the first totem pole drive and the second totem pole drive between the second PWM control module and the switching tube M5 and the switching tube M6, the driving currents of the switching tube M5 and the switching tube M6 are increased, so that the driving capability of the second PWM control module to the switching tube M5 and the switching tube M6 is increased.
Further, in a preferred implementation manner, in this embodiment, the second PWM control module controls the switching tube M5 and the switching tube M6 in a closed-loop control manner, an input end of the second PWM control module is connected to the rectifying module, and the second PWM control module is configured to control the duty ratio of the PWM signal output by the second PWM control module to the first switching module and the second switching module according to the amplitude of the dc voltage output by the rectifying module.
Further, in a preferred implementation manner, in this embodiment, the second PWM control module includes a controller chip of a model SG3525 and a peripheral circuit thereof, an input end of the controller chip is connected to the rectification module, and two output ends of the controller chip are respectively connected to the first switch module and the second switch module. The controller chip of the type is a current control type PWM controller, the pulse width of the current control type PWM controller is adjusted according to feedback current, a voltage signal output by a rectifying module is directly compared with an error amplifier output signal configured in the input end of a pulse width comparator, so that the duty ratio of PWM signals output to a first switch module and a second switch module is adjusted, the output peak current is changed along with the change of error voltage, and due to the structural arrangement of a voltage loop and a current loop double-loop system, the voltage regulation rate, the load regulation rate and the transient response characteristic of a switching power supply are improved.
Further, in a preferred embodiment, in the present embodiment, the DC-DC conversion circuit further includes a capacitor C3, a capacitor C4, and a diode D5, two ends of the capacitor C3 are respectively connected to the middle node and the ground terminal of the high-frequency transformer, the capacitor C4 is connected in parallel to the capacitor C3, an anode of the diode D5 is connected to the ground terminal, and a cathode of the diode D5 is connected to the middle node of the high-frequency transformer. The capacitor C3 and the capacitor C4 are low-voltage filter capacitors for reducing the harmonic waves existing in the circuit, and the diode D5 is used for preventing the reverse connection of the external direct-current power supply.
Further, in this embodiment, the first switch module further includes a resistor R9, a resistor R10, and a diode D6, two ends of the resistor R9 are respectively connected to the output terminal of the second PWM control module and the base of the transistor Q7, two ends of the resistor R10 are respectively connected to the base of the transistor Q7 and the ground, an anode of the diode D6 is connected to the base of the transistor Q7, and a cathode of the diode D6 is connected to the output terminal of the second PWM control module. The second switch module further comprises a resistor R11, a resistor R12 and a diode D7, two ends of the resistor R11 are respectively connected with the output end of the second PWM control module and the base of the triode Q9, two ends of the resistor R12 are respectively connected with the base of the triode Q9 and the ground end, the anode of the diode D7 is connected with the base of the triode Q9, and the cathode of the diode D7 is connected with the output end of the second PWM control module.
Further as a preferred implementation manner, in this embodiment, the second PWM control module further includes a transistor Q15, a transistor Q16, a resistor R22, a resistor R23, a resistor R24, a resistor R25, and a voltage regulator D8, the triode Q15 is an NPN type triode, the triode Q16 is a PNP type triode, the negative electrode of the voltage regulator tube D8 is connected with a power supply end, the positive electrode of the voltage regulator tube D8 is connected with the base electrode of the triode Q15 through a resistor R22, the emitter of the triode Q15 is grounded, two ends of the resistor R23 are respectively connected with the base and the emitter of the triode Q15, the collector of the transistor Q15 is connected to the base of the transistor Q16 through a resistor R24, the collector of the triode Q16 is connected with the VC end of the controller chip, the emitter of the triode Q16 is connected with the VCC end of the controller chip, and two ends of the resistor R25 are respectively connected with the base electrode and the emitter electrode of the triode Q16. According to the embodiment, the connection structure of the elements prevents the inverter circuit from causing unstable output of the controller chip due to unstable power supply voltage in the starting process.
Referring to fig. 6, further as a preferred implementation manner, in this embodiment, the boot circuit includes:
the direct current voltage stabilizing module is used for carrying out voltage reduction operation on input direct current voltage with a certain amplitude, converting the input direct current voltage into direct current voltage with another amplitude and outputting the direct current voltage;
the starting module is used for transmitting starting current to the direct current voltage stabilizing module;
the direct current voltage stabilizing module comprises a capacitor C5, a voltage reducing chip and peripheral circuits thereof, wherein the voltage reducing chip is provided with a power supply end and a ground end, two ends of the capacitor C5 are respectively connected with the power supply end and the ground end of the voltage reducing chip, the ground end of the voltage reducing chip is connected with the ground end, the starting module is connected with the capacitor C5 and used for increasing the charging current of the capacitor C5, and the direct current voltage stabilizing module is respectively connected with each DC-DC conversion circuit and each DC-AC conversion circuit.
Specifically, this embodiment carries out the step-down operation with the voltage of outside direct current power output through direct current voltage stabilization module in order to realize supplying power to DC-DC converting circuit among the inverter circuit and the intelligent chip of output PWM control signal among the DC-AC converting circuit, utilizes the increase of start module to electric capacity C5's charging current, makes the speed that electric capacity C5 both ends voltage promoted accelerate to realize the quick start of step-down chip, finally realize inverter circuit's quick start function.
Further as a preferred implementation manner, in this embodiment, the starting module includes a resistor R13, a resistor R14, a transistor Q11, a resistor R15, a resistor R16, a transistor Q12, a capacitor C6, a resistor R17, and a transistor Q13, the resistor R13 and the resistor R14 are connected in series between a power supply terminal and a ground terminal, a base and an emitter of the transistor Q11 are respectively connected to two ends of the resistor R13, a base of the transistor Q11 is connected to a connection point between the resistor R13 and the resistor R14, a collector of the transistor Q11 is connected to the ground terminal through a resistor R15 and a resistor R16 connected in series, a base of the transistor Q12 is connected to a connection point between the resistor R15 and the resistor R16, an emitter of the transistor Q12 is connected to the ground terminal, a collector of the transistor Q12 is connected to a base of the transistor Q13 through a resistor R17, two ends of the capacitor C6 are respectively connected to an emitter of the transistor Q13 and the, the emitter of the transistor Q13 is connected to the emitter of the transistor Q11, and the collector of the transistor Q13 is connected to ground through a capacitor C5. Specifically, the transistor Q11, the transistor Q12, and the transistor Q13 are provided to increase the charging current to the capacitor C5.
Further, in a preferred embodiment, in the present embodiment, the boot circuit further includes an auxiliary boot module, the auxiliary boot module is connected to the start module, and the auxiliary boot module is configured to control the start module to switch on the power-on loop according to the received external control signal. In the practical application process, the switch element SW is arranged in the starting module to realize the manual starting function, in this embodiment, the switching element SW is used to realize the starting function of the inverter circuit, and an auxiliary starting module is additionally arranged to realize the starting of the inverter circuit. Specifically, in this embodiment, the auxiliary power-on module includes a resistor R18, a resistor R19, and a transistor Q14, the auxiliary power-on module is provided with a signal input end for receiving an external control signal, the signal input end is connected to a base of the transistor Q14 through a resistor R18, two ends of the resistor R19 are respectively connected to a base and an emitter of the transistor Q14, the emitter of the transistor Q14 is connected to ground, a collector of the transistor Q14 is connected to the start-up module, and on and off states of a transistor Q14 in the auxiliary power-on module are controlled by the external control signal. More specifically, in this embodiment, the transistor Q14 is used to control the connection of the resistor R14 to ground.
Further, in this embodiment, the type of the buck chip is PL8322, the buck chip is a synchronous rectification buck switching converter with upper and lower MOS transistors integrated therein, and a cycle-by-cycle peak current control mode is adopted in the buck chip, so that the buck chip can realize fast dynamic response.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments, but is capable of various modifications and substitutions without departing from the spirit of the invention.
Claims (10)
1. An inverter circuit, comprising:
the DC-DC conversion circuit is used for converting input low-voltage direct current into high-frequency low-voltage alternating current, converting the high-frequency low-voltage alternating current into high-frequency high-voltage alternating current and finally converting the high-frequency high-voltage alternating current into high-voltage direct current;
a DC-AC conversion circuit for converting the high-voltage direct current into a high-voltage alternating current of a specific frequency;
the starting circuit is used for supplying power to the DC-DC conversion circuit and the DC-AC conversion circuit;
the DC-DC conversion circuit is connected with the DC-AC conversion circuit, and the starting circuit is respectively connected with the DC-DC conversion circuit and the DC-AC conversion circuit;
the DC-AC conversion circuit comprises a first PWM control module, a first upper bridge arm module, a second upper bridge arm module, a first lower bridge arm module and a second lower bridge arm module, wherein a plurality of output ends of the first PWM control module are respectively connected with the first upper bridge arm module, the second upper bridge arm module, the first lower bridge arm module and the second lower bridge arm module; the first upper bridge arm module and the second upper bridge arm module are respectively connected with a DC-DC conversion circuit, and the first lower bridge arm module and the second lower bridge arm module are respectively connected with a ground end;
the first upper bridge arm module comprises a switching tube M1, a first boosting unit for increasing voltage between a grid electrode and a source electrode of the switching tube M1, and a first bleeder unit for accelerating discharge of a capacitor between the grid electrode and the source electrode of the switching tube M1;
the second upper bridge arm module comprises a switching tube M2, a second boosting unit for increasing voltage between the grid electrode and the source electrode of the switching tube M2, and a second discharging unit for accelerating discharge of a capacitor between the grid electrode and the source electrode of the switching tube M2;
the grid electrode of the switching tube M1 and the grid electrode of the switching tube M2 are respectively connected with the output end of the first PWM control module, and the drain electrode of the switching tube M1 and the drain electrode of the switching tube M2 are respectively connected with the DC-DC conversion circuit.
2. The inverter circuit according to claim 1, wherein: the first boosting unit comprises a diode D1 and a capacitor C1, the anode of the diode D1 is connected with a power supply end, the cathode of the diode D1 is connected with one end of a capacitor C1, the other end of the capacitor C1 is connected with the source of a switching tube M1, and the grid of the switching tube M1 is connected with the cathode of the diode D1;
the second boosting unit comprises a diode D3 and a capacitor C2, the anode of the diode D3 is connected with a power supply end, the cathode of the diode D3 is connected with one end of a capacitor C2, the other end of the capacitor C2 is connected with the source of a switching tube M2, and the gate of the switching tube M2 is connected with the cathode of the diode D3.
3. The inverter circuit according to claim 2, wherein: the first bleeder unit comprises a triode Q1, a diode D2 and a resistor R1, wherein the anode and the cathode of the diode D2 are respectively connected with the base electrode and the emitter electrode of the triode Q1, the anode of the diode D2 is connected with the cathode of a diode D1, the emitter electrode of the triode Q1 is connected with the gate electrode of a switching tube M1 through the resistor R1, and the collector electrode of the triode Q1 is connected with the source electrode of the switching tube M1;
the second bleeder unit comprises a triode Q2, a diode D4 and a resistor R2, wherein the anode and the cathode of the diode D4 are respectively connected with the base electrode and the emitter electrode of the triode Q2, the anode of the diode D4 is connected with the cathode of a diode D3, the emitter electrode of the triode Q2 is connected with the grid electrode of the switching tube M2 through the resistor R2, and the collector electrode of the triode Q2 is connected with the source electrode of the switching tube M2.
4. The inverter circuit according to claim 3, wherein: the first upper bridge arm module further comprises a first photoelectric coupler U1, the input end of the first photoelectric coupler U1 is connected with the output end of the first PWM control module, and the output end of the first photoelectric coupler U1 controls connection between the negative electrode of the diode D1 and the positive electrode of the diode D2;
the second upper bridge arm module further comprises a second photoelectric coupler U2, the input end of the second photoelectric coupler U2 is connected with the output end of the first PWM control module, and the output end of the second photoelectric coupler U2 controls connection between the negative electrode of the diode D3 and the positive electrode of the diode D4.
5. The inverter circuit according to claim 1, wherein the DC-DC conversion circuit comprises:
the high-frequency transformer is used for converting high-frequency low-voltage alternating current into high-frequency high-voltage alternating current, a first winding and a second winding are arranged on the input side of the high-frequency transformer, and one end of the first winding and one end of the second winding are connected together to form an intermediate node;
the rectifier module is used for converting alternating current into direct current;
the first switch module is used for controlling the circulation of the direct current in a first winding of the high-frequency transformer;
the second switch module is used for controlling the circulation of the direct current in a second winding of the high-frequency transformer;
the second PWM control module is used for transmitting two groups of complementary PWM signals to the first switch module and the second switch module respectively;
the second PWM control module is respectively connected with a first switch module and a second switch module, the first switch module is connected with a first winding of the high-frequency transformer, the second switch module is connected with a second winding of the high-frequency transformer, the output side of the high-frequency transformer is connected with a rectifying module, and the rectifying module is connected with the DC-AC conversion circuit;
the first switch module comprises a first totem pole drive consisting of a triode Q7 and a triode Q8 and a switch tube M5, the second PWM control module is connected with the input end of the first totem pole drive, the output end of the first totem pole drive is connected with the grid electrode of the switch tube M5, and the source electrode and the drain electrode of the switch tube M5 are respectively connected with the first winding of the high-frequency transformer and the ground end;
the second switch module comprises a second totem pole drive composed of a triode Q9 and a triode Q10, and a switch tube M6, the second PWM control module is connected to an input end of the second totem pole drive, an output end of the second totem pole drive is connected to a gate of the switch tube M6, and a source and a drain of the switch tube M6 are respectively connected to a second winding of the high-frequency transformer and a ground terminal.
6. The inverter circuit according to claim 5, wherein: the input end of the second PWM control module is connected with the rectifying module, and the second PWM control module is configured to control the duty ratio of PWM signals output to the first switch module and the second switch module by the second PWM control module according to the DC voltage amplitude output by the rectifying module.
7. The inverter circuit according to claim 6, wherein: the second PWM control module comprises a controller chip with the model of SG3525 and a peripheral circuit thereof, the input end of the controller chip is connected with the rectification module, and two output ends of the controller chip are respectively connected with the first switch module and the second switch module.
8. The inverter circuit according to claim 1, wherein the power-on circuit comprises:
the direct current voltage stabilizing module is used for carrying out voltage reduction operation on the input direct current voltage and converting the direct current voltage into direct current voltage with another amplitude value for output;
the starting module is used for transmitting starting current to the direct current voltage stabilizing module;
the direct current voltage stabilizing module comprises a capacitor C5, a voltage reducing chip and peripheral circuits thereof, wherein the voltage reducing chip is provided with a power supply end and a ground end, two ends of the capacitor C5 are respectively connected with the power supply end and the ground end of the voltage reducing chip, the ground end of the voltage reducing chip is connected with the ground end, the starting module is connected with the capacitor C5 and used for increasing the charging current of the capacitor C5, and the direct current voltage stabilizing module is respectively connected with each DC-DC conversion circuit and each DC-AC conversion circuit.
9. The inverter circuit according to claim 8, wherein the start-up module comprises a resistor R13, a resistor R14, a transistor Q11, a resistor R15, a resistor R16, a transistor Q12, a capacitor C6, a resistor R17 and a transistor Q13, the resistor R13 and the resistor R14 are connected in series between a power supply terminal and a ground terminal, a base and an emitter of the transistor Q11 are respectively connected to both ends of the resistor R13, a base of the transistor Q11 is connected to a connection point between the resistor R13 and the resistor R14, a collector of the transistor Q11 is connected to the ground terminal through the resistor R15 and the resistor R16 connected in series, a base of the transistor Q12 is connected to a connection point between the resistor R15 and the resistor R16, an emitter of the transistor Q12 is connected to the ground terminal, a collector of the transistor Q12 is connected to the base of the transistor Q13 through the resistor R17, and an emitter of the capacitor C6 is respectively connected to a base of the transistor Q13, the emitter of the transistor Q13 is connected to the emitter of the transistor Q11, and the collector of the transistor Q13 is connected to ground through a capacitor C5.
10. The inverter circuit according to claim 9, wherein the power-on circuit further comprises an auxiliary power-on module, the auxiliary power-on module is connected to the start module, and the auxiliary power-on module is configured to control the start module to switch on the power-on loop according to the received external control signal;
the auxiliary power-on module comprises a resistor R18, a resistor R19 and a triode Q14, the auxiliary power-on module is provided with a signal input end used for receiving an external control signal, the signal input end is connected with the base electrode of the triode Q14 through a resistor R18, two ends of the resistor R19 are respectively connected with the base electrode and the emitting electrode of the triode Q14, the emitting electrode of the triode Q14 is connected with the ground end, and the collector electrode of the triode Q14 is connected with the starting module.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110492773A (en) * | 2019-08-19 | 2019-11-22 | 佛山市众盈电子有限公司 | A kind of inverter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110492773A (en) * | 2019-08-19 | 2019-11-22 | 佛山市众盈电子有限公司 | A kind of inverter circuit |
| CN110492773B (en) * | 2019-08-19 | 2024-08-09 | 佛山市众盈电子有限公司 | Inverter circuit |
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Assignee: Guangdong Yaoda Financial Leasing Co.,Ltd. Assignor: FOSHAN UNIPOWER ELECTRONIC Co.,Ltd. Contract record no.: X2022980008110 Denomination of utility model: An inverter circuit Granted publication date: 20200414 License type: Exclusive License Record date: 20220621 |
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Denomination of utility model: An inverter circuit Effective date of registration: 20220622 Granted publication date: 20200414 Pledgee: Guangdong Yaoda Financial Leasing Co.,Ltd. Pledgor: FOSHAN UNIPOWER ELECTRONIC Co.,Ltd. Registration number: Y2022980008524 |