CN117200561A - Spike voltage control circuit and synchronous rectification switching power supply - Google Patents
Spike voltage control circuit and synchronous rectification switching power supply Download PDFInfo
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- CN117200561A CN117200561A CN202311291102.9A CN202311291102A CN117200561A CN 117200561 A CN117200561 A CN 117200561A CN 202311291102 A CN202311291102 A CN 202311291102A CN 117200561 A CN117200561 A CN 117200561A
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- 238000007599 discharging Methods 0.000 claims abstract description 31
- 238000005265 energy consumption Methods 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims description 15
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application provides a spike voltage control circuit and a synchronous rectification switching power supply, wherein the spike voltage control circuit is used for controlling spike voltage on a first switching tube in the synchronous rectification switching power supply; the spike voltage control circuit includes: the device comprises a charging and discharging capacity, a first on-off control unit, a second on-off control unit and an energy consumption unit; the charging and discharging capacity is used for absorbing and storing energy of peak voltage generated when the first switching tube is disconnected; the first on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the first on-off control unit when the first switching tube is disconnected, and the second on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the second on-off control unit when the first switching tube is disconnected, so that energy stored in the charging and discharging capacity is transmitted to the energy storage electrolytic capacitor for storage when the first switching tube is disconnected. Energy is transmitted to the energy storage electrolytic capacitor for storage, so that loss is reduced, and the conversion efficiency of the power supply is improved.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to a spike voltage control circuit and a synchronous rectification switching power supply.
Background
A switching power supply (Switch Mode Power Supply, SMPS for short), also called a switching power supply or a switching converter, is a high-frequency power conversion device, and is a power supply. The function is to convert a voltage of one level into a voltage or current required by the user terminal through different types of structures. In the synchronous rectification switching power supply, a combination of a first switching tube and a second switching tube is generally adopted at an output side, and for the first switching tube, a parasitic inductance, a parasitic capacitance and the like exist in a PCB circuit, so that peak voltage occurs when the first switching tube is turned off, and if the first switching tube is not controlled, the first switching tube is easily damaged, so that the whole synchronous rectification switching power supply becomes irreversible failure.
In a conventional scheme, in order to control the spike voltage, an RC absorption clamp is generally connected in parallel to two ends of a first access terminal and a second access terminal of a first switching tube, when the first switching tube is turned off and the spike voltage occurs, energy corresponding to the spike voltage flows through a capacitor and a resistor in the RC absorption clamp, part of energy is stored in the capacitor, part of energy is consumed in the resistor, and when the next period begins (i.e., when the first switching tube is turned on), the stored energy of the capacitor flows through the capacitor, the first switching tube, the resistor and the capacitor in turn, so that the stored energy is consumed in the first switching tube and the resistor; the whole process is to solve the problem that the peak voltage of the first switching tube causes more energy loss, so that the conversion efficiency of the synchronous rectification switching power supply is low.
Disclosure of Invention
Aiming at the defects existing in the prior art, the application provides a peak voltage control circuit and a synchronous rectification switching power supply.
In a first aspect, the present application provides, in one embodiment, a spike voltage control circuit for controlling a spike voltage present on a first switching tube in a synchronous rectification switching power supply; the spike voltage control circuit includes:
the device comprises a charging and discharging capacity, a first on-off control unit, a second on-off control unit and an energy consumption unit;
the first end of the charge-discharge capacity is electrically connected with the first access end of the first switch tube, the second end of the charge-discharge capacity is electrically connected with the first end of the first on-off control unit and the second end of the second on-off control unit respectively, the second end of the first on-off control unit is electrically connected with the positive electrode of the energy storage electrolytic capacitor of the synchronous rectification switch power supply, the first end of the second on-off control unit is electrically connected with the second access end of the first switch tube and the negative electrode of the energy storage electrolytic capacitor respectively, and the energy consumption unit is connected between the second end of the charge-discharge capacity and the positive electrode of the energy storage electrolytic capacitor in series;
the charging and discharging capacity is used for absorbing and storing energy of peak voltage generated when the first switching tube is disconnected;
the first on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the first on-off control unit when the first switching tube is disconnected, and the second on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the second on-off control unit when the first switching tube is disconnected, so that energy stored in the charging and discharging capacity is transmitted to the energy storage electrolytic capacitor for storage when the first switching tube is disconnected;
the energy consumption unit is used for consuming a part of energy transmitted to the energy storage electrolytic capacitor by the charging and discharging capacity.
In one embodiment, the energy dissipating unit comprises a bleeder resistor;
the discharging resistor is connected in series between the second end of the charging and discharging capacity and the positive electrode of the energy storage electrolytic capacitor.
In one embodiment, the first end of the energy consumption unit is electrically connected with the second end of the first on-off control unit, and the second end of the energy consumption unit is electrically connected with the positive electrode of the energy storage electrolytic capacitor.
In one embodiment, the first on-off control unit includes a first diode;
the anode of the first diode is electrically connected with the second end of the charging and discharging capacity and the second end of the second on-off control unit respectively, and the cathode of the first diode is electrically connected with the anode of the energy storage electrolytic capacitor.
In one embodiment, the second on-off control unit comprises a second diode;
the cathode of the second diode is respectively and electrically connected with the second end of the charge-discharge capacity and the first end of the first on-off control unit, and the anode of the second diode is respectively and electrically connected with the second access end of the first switch tube and the cathode of the energy storage electrolytic capacitor.
In one embodiment, the spike voltage control circuit further comprises:
a clamping unit;
the first end of the clamping unit is respectively and electrically connected with the first end of the charging and discharging capacity and the first access end of the first switching tube, and the second end of the clamping unit is respectively and electrically connected with the positive electrode of the energy storage electrolytic capacitor and the second end of the first on-off control unit;
the clamping unit is used for transmitting energy corresponding to the peak voltage generated by the first switching tube to the energy storage electrolytic capacitor for storage when the peak voltage generated by the first switching tube exceeds a preset voltage.
In one embodiment, the clamping unit comprises a bi-directional TVS tube;
the first anode of the bidirectional TVS tube is respectively and electrically connected with the first access end of the first switch tube and the first end of the charging and discharging capacity, and the second anode of the bidirectional TVS tube is respectively and electrically connected with the second end of the first on-off control unit and the anode of the energy storage electrolytic capacitor.
In a second aspect, in one embodiment, the application provides a synchronous rectification switching power supply, which comprises a transformer, a second switching tube, a first switching tube, an energy storage electrolytic capacitor and an inductor, wherein a first access end of the second switching tube is electrically connected with a first end of a secondary winding of the transformer, a second access end of the second switching tube is respectively electrically connected with the first end of the inductor and the first access end of the first switching tube, a second end of the inductor is electrically connected with an anode of the energy storage electrolytic capacitor, and a second end of a secondary winding of the transformer, the second access end of the first switching tube and a cathode of the energy storage electrolytic capacitor are respectively grounded; the synchronous rectification switching power supply further includes:
the spike voltage control circuit of any of the embodiments described above.
In one embodiment, the synchronous rectification switching power supply further comprises a first switching tube driving circuit; the first switching tube driving circuit includes:
NPN triode and PNP triode;
the base electrode of the NPN triode and the base electrode of the PNP triode are respectively connected with control signals, the collector electrode of the NPN triode is connected with a working power supply signal, and the emitter electrode of the NPN triode is respectively and electrically connected with the control end of the first switch tube and the collector electrode of the PNP triode, and the emitter electrode of the PNP triode is grounded.
In one embodiment, the first switching tube driving circuit further includes:
a filter capacitor;
the first end of the filter capacitor is electrically connected with the collector electrode of the NPN triode, and the second end of the filter capacitor is grounded.
Through above-mentioned spike voltage control circuit and synchronous rectification switch power supply, set up first break-make control unit and second break-make control unit, the second end of charge and discharge capacity is connected with the first end of first break-make control unit and the second end electricity of second break-make control unit respectively, the second end of first break-make control unit is connected with synchronous rectification switch power supply's energy storage electrolytic capacitor's positive pole electricity, the first end of second break-make control unit is connected with the second access end of first switching tube and the negative pole electricity of energy storage electrolytic capacitor respectively, utilize first break-make control unit and second break-make control unit to the break-make control ability of corresponding circuit, can store the energy that charges and discharges the energy storage capacity stored to the energy storage electrolytic capacitor's output end that can be used for carrying synchronous rectification switch power supply, and then reduced the loss of energy, synchronous rectification switch power supply's conversion efficiency has been improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a spike voltage control circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a spike voltage control circuit according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a synchronous rectification switching power supply according to an embodiment of the present application;
fig. 4 is a schematic diagram of a specific structure of a synchronous rectification switching power supply according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. In the present application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described as "exemplary" in this disclosure is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
In a first aspect, as shown in fig. 1, in one embodiment, the present application provides a spike voltage control circuit, where the spike voltage control circuit is configured to control a spike voltage on a first switching tube (in the present embodiment, the first switching tube is exemplified by a first MOS tube) that is present in a synchronous rectification switching power supply;
the spike voltage control circuit includes:
the device comprises a charging and discharging capacity, a first on-off control unit, a second on-off control unit and an energy consumption unit;
the first end of the charge-discharge capacity is electrically connected with the drain electrode of the first MOS tube, the second end of the charge-discharge capacity is respectively electrically connected with the first end of the first on-off control unit and the second end of the second on-off control unit, the second end of the first on-off control unit is electrically connected with the positive electrode of the energy storage electrolytic capacitor of the synchronous rectification switching power supply, the first end of the second on-off control unit is respectively electrically connected with the source electrode of the first MOS tube and the negative electrode of the energy storage electrolytic capacitor, and the energy consumption unit is connected in series between the second end of the charge-discharge capacity and the positive electrode of the energy storage electrolytic capacitor;
the first on-off control unit is mainly used for controlling the on-off of a circuit between the charging and discharging capacity and the energy storage electrolytic capacitor;
in the synchronous rectification switching power supply, the source electrode of the first MOS tube and the negative electrode of the energy storage electrolytic capacitor are grounded, namely the second on-off control unit is mainly used for controlling the on-off of a circuit between the charging and discharging capacity and the ground;
the charge and discharge capacity is used for absorbing and storing energy of peak voltage generated when the first MOS tube is disconnected;
the first on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the first on-off control unit when the first MOS tube is disconnected, and the second on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the second on-off control unit when the first MOS tube is disconnected, so that the energy stored in the charge-discharge capacity is transmitted to the energy storage electrolytic capacitor for storage when the first MOS tube is disconnected;
in the prior art, the second end of the charge-discharge vessel is grounded through a resistor, so that an RC absorption clamping circuit is formed, the RC absorption clamping circuit is connected with the first MOS tube in parallel to form a loop, so that the charge-discharge vessel can charge and store energy based on peak voltages appearing at two ends of the first MOS tube, and the voltage of one end of the charge-discharge vessel, which is close to the resistor, is pulled up by utilizing the characteristic that the voltages at two ends of the capacitor cannot be suddenly changed, so that most of energy is consumed on the resistor; in this embodiment, when the first MOS transistor is turned off, the second on-off control unit realizes unidirectional conduction from the first end to the second end of the second on-off control, that is, a path from the charge/discharge cell to the ground cannot be formed as in the prior art, that is, energy stored in the charge/discharge cell cannot be consumed on the resistor, and meanwhile, the first on-off control unit realizes unidirectional conduction from the first end to the second end of the first on-off control unit, that is, a path from the charge/discharge cell to the energy storage electrolytic capacitor is formed, that is, energy stored in the charge/discharge cell can be transmitted to the energy storage electrolytic capacitor through the first on-off control unit for storage;
the first on-off control unit and the second on-off control unit can adopt a triode mode, for example, an NPN triode is taken as an example, the collector electrode of the triode corresponding to the first on-off control unit is respectively and electrically connected with the second end of the charging and discharging capacity and the emitter electrode of the triode corresponding to the second on-off control unit, the emitter electrode of the triode corresponding to the first on-off control unit is electrically connected with the positive electrode of the energy storage electrolytic capacitor, and the collector electrode of the triode corresponding to the second on-off control unit is respectively and electrically connected with the source electrode of the first MOS tube and the negative electrode of the energy storage electrolytic capacitor; when the first MOS tube is disconnected, the triode corresponding to the first on-off control unit is controlled to be conducted, and when the first MOS tube is conducted, the triode corresponding to the second on-off control unit is controlled to be conducted;
the energy consumption unit is used for consuming a part of energy transmitted to the energy storage electrolytic capacitor by the charge and discharge capacity;
the charging and discharging capacity transmits the stored energy to the energy storage electrolytic capacitor for storage, but the process does not involve energy consumption, and the charging and discharging capacity and the energy storage electrolytic capacitor are connected in parallel at two ends of the first MOS tube, so that the voltage at two ends of the first MOS tube is still high, and the risk of damage exists; therefore, in this embodiment, an energy consumption unit is further provided, which is configured to consume a part of energy transferred from the charging/discharging capacity to the energy storage electrolytic capacitor, so as to reduce the voltage at two ends of the first MOS tube;
the energy consumption unit can be any device or apparatus for energy consumption, for example, a motor in an electricity system connected with a synchronous rectification switch power supply, so as to drive the corresponding motor to rotate, convert energy into kinetic energy and realize consumption.
Through above-mentioned spike voltage control circuit, set up first break-make control unit and second break-make control unit, utilize first break-make control unit and second break-make control unit to the break-make control ability of corresponding circuit, can store the energy that charges and discharges the energy storage to energy storage electrolytic capacitor with reliable transmission, and the energy that energy storage electrolytic capacitor stored can be used for carrying to synchronous rectification switching power supply's output end, and then reduced the loss of energy, improved synchronous rectification switching power supply's conversion efficiency.
As shown in fig. 2, in one embodiment, the energy dissipating unit includes a bleeder resistor R6;
the discharging resistor R6 is connected in series between the second end of the charging and discharging capacity C5 and the positive electrode of the energy storage electrolytic capacitor C7;
when energy flows through the bleeder resistor R6, the bleeder resistor R6 generates heat, and further, consumption is realized in a heat energy form.
The energy consumption is realized through a resistor form, and the structure is simple.
As shown in fig. 2, in one embodiment, the first on-off control unit includes a first diode D3, and the second on-off control unit includes a second diode D5;
the anode of the first diode is respectively and electrically connected with the second end of the charge-discharge capacity and the cathode of the second diode D5, the cathode of the first diode is electrically connected with the anode of the energy storage electrolytic capacitor C7, and the anode of the second diode D5 is respectively and electrically connected with the source electrode of the first MOS tube Q3 and the cathode of the energy storage electrolytic capacitor C7;
the diode itself has unidirectional conduction, so that the diode is used as an on-off control unit, the structure is simple, and the circuit can be simplified.
As shown in fig. 2, in one embodiment, a first end of the energy consumption unit (i.e., a first end of the bleeder resistor R6) is electrically connected to a second end of the first on-off control unit (i.e., a cathode of the first diode D3), and a second end of the energy consumption unit (i.e., a second end of the bleeder resistor R6) is electrically connected to an anode of the energy storage electrolytic capacitor C7;
in other embodiments, the energy dissipation unit may be disposed at other positions, for example, as shown in fig. 1, where a first end of the energy dissipation unit is electrically connected to a second end of the charging/discharging capacity, and the second end of the energy dissipation unit is electrically connected to the first end of the first on/off control unit and the second end of the second on/off control unit, respectively.
As shown in fig. 1, in one embodiment, the spike voltage control circuit further comprises:
a clamping unit;
the first end of the clamping unit is respectively and electrically connected with the first end of the charge-discharge capacity and the drain electrode of the first MOS tube, and the second end of the clamping unit is respectively and electrically connected with the positive electrode of the energy storage electrolytic capacitor and the second end of the first on-off control unit;
the clamping unit is used for transmitting energy corresponding to the peak voltage generated by the first MOS tube to the energy storage electrolytic capacitor for storage when the peak voltage generated by the first MOS tube exceeds a preset voltage;
the clamping unit is mainly used for controlling the peak voltage when the peak voltage is too high in some abnormal states, so that related devices are prevented from being damaged by the too high peak voltage.
As shown in fig. 2, in one embodiment, the clamping unit includes a bidirectional TVS tube TVS1;
the first anode of the bidirectional TVS tube TVS1 is respectively and electrically connected with the drain electrode of the first MOS tube Q3 and the first end of the charge-discharge capacitor C5, the second anode of the bidirectional TVS tube TVS1 is respectively and electrically connected with the second end of the first on-off control unit (namely the cathode of the first diode D3, specifically, the second anode of the bidirectional TVS tube TVS1 is electrically connected with the cathode of the first diode D3 through the bleeder resistor R6) and the anode of the energy storage electrolytic capacitor C7;
wherein, through two-way TVS tube TVS1, can clamp the spike voltage to the safe scope, avoid the damage to the relevant device to appear, in other embodiments, also can adopt one-way TVS tube.
Taking the voltage control circuit shown in fig. 2 as an example, the charge-discharge capacitor C5, the first diode D3, the discharge resistor R6 and the energy storage electrolytic capacitor C7 form an RCD absorption module, the bidirectional TVS tube TVS1 and the energy storage electrolytic capacitor C7 form a peak clamping module, and the charge-discharge capacitor C5, the first MOS tube Q3 and the second diode D5 form a discharge module; the corresponding circuit functions are as follows:
1. when the first MOS transistor Q3 is disconnected, parasitic inductance energy in the power loop can generate peak voltage Vds between the drain electrode and the source electrode of the first MOS transistor Q3, energy current flows through the charge-discharge capacitor C5, the first diode D3 and the discharge resistor R6 to the energy storage electrolytic capacitor C7, part of the energy is stored in the charge-discharge capacitor C5 and the energy storage electrolytic capacitor C7, part of the energy is consumed in the discharge resistor R6, and part of the energy transmitted to the energy storage electrolytic capacitor C7 can be saved and transmitted to the output end;
2. meanwhile, when the peak voltage Vds of the first MOS transistor Q3 is too high in some abnormal states, the response of the bi-directional TVS transistor TVS1 is triggered, and energy flows through the bi-directional TVS transistor TVS1 to the energy storage electrolytic capacitor C7 in a similar way, and part of the energy is consumed on the bi-directional TVS transistor TVS1 and part of the energy is stored on the energy storage electrolytic capacitor C7, and part of the energy transmitted to the energy storage electrolytic capacitor C7 can be saved and transmitted to the output end;
3. when the next period starts (i.e. when the first MOS transistor Q3 is turned on), the energy stored in the charge-discharge transistor C5 flows through the charge-discharge transistor C5, the first MOS transistor Q3, the second diode D5, and the charge-discharge transistor C5, and the energy stored in the charge-discharge transistor C5 is consumed in the first MOS transistor Q3;
all energy flowing through the energy storage electrolytic capacitor C7 can be stored and used at the output end in the whole process, so that part of energy lost due to voltage clamping of the first MOS tube Q3 is saved, and the conversion efficiency of the synchronous rectification switching power supply is improved.
As shown in fig. 3, in a second aspect, in an embodiment, the present application provides a synchronous rectification switching power supply, which includes a transformer, a second switching tube (in this embodiment, the second switching tube is exemplified by a second MOS tube), a first switching tube (in this embodiment, the first switching tube is exemplified by a first MOS tube), an energy storage electrolytic capacitor, and an inductor, a drain electrode of the second MOS tube is electrically connected to a first end of a secondary winding of the transformer, a source electrode of the second MOS tube is electrically connected to a first end of the inductor and a drain electrode of the first MOS tube, a second end of the inductor is electrically connected to an anode of the energy storage electrolytic capacitor, and a second end of the secondary winding of the transformer, a source electrode of the first MOS tube, and a cathode of the energy storage electrolytic capacitor are respectively grounded; the synchronous rectification switching power supply further includes:
a spike voltage control circuit in any of the embodiments described above;
the description of the spike voltage control circuit and the connection relationship with the synchronous rectification switching power supply can refer to the above embodiments, and are not repeated herein.
Through above-mentioned synchronous rectification switch power supply, set up first break-make control unit and second break-make control unit, the second end of charge and discharge capacity is connected with the first end of first break-make control unit and the second end electricity of second break-make control unit respectively, the second end of first break-make control unit is connected with synchronous rectification switch power supply's energy storage electrolytic capacitor's positive pole electricity, the first end of second break-make control unit is connected with the source of first MOS pipe and the negative pole electricity of energy storage electrolytic capacitor respectively, utilize first break-make control unit and second break-make control unit to the break-make control ability of corresponding circuit, can store the energy that charges and discharges the energy storage capacity stored to energy storage electrolytic capacitor's output end that can be used for carrying synchronous rectification switch power supply, and then reduced the loss of energy, synchronous rectification switch power supply's conversion efficiency has been improved.
As shown in fig. 4, in one embodiment, the synchronous rectification switching power supply further includes a first MOS transistor driving circuit; the first MOS transistor driving circuit includes:
NPN transistor Q4 and PNP transistor Q6;
the base electrode of the NPN triode Q4 and the base electrode of the PNP triode Q6 are respectively connected with a control signal (namely SR_PWM), the collector electrode of the NPN triode Q4 is connected with a working power supply signal (namely +12V), and the emitter electrode of the NPN triode Q4 is respectively and electrically connected with the grid electrode of the first MOS tube Q3 and the collector electrode of the PNP triode Q6, and the emitter electrode of the PNP triode Q6 is grounded;
when the accessed SR_PWM is at a high level, the NPN triode Q4 is turned on, the PNP triode Q6 is turned off, and +12V passes through the NPN triode Q4 and the resistor R9 to the grid electrode of the first MOS tube Q3, so that the first MOS tube Q3 is driven to be turned on; when the accessed SR_PWM is at a low level, the NPN triode Q4 is turned off, the PNP triode Q6 is turned on, +12V cannot reach the grid electrode of the first MOS tube Q3, and the first MOS tube Q3 is turned off; when crosstalk signals exist in the circuit, the first MOS transistor Q3 can be prevented from being triggered by mistake through the resistor R12, the diode D4 and the PNP triode Q6 to the ground; the resistance of the resistor R16 is large, for example, 20kΩ, to reduce the input impedance.
As shown in fig. 4, in one embodiment, the first MOS transistor driving circuit further includes:
a filter capacitor C4;
the first end of the filter capacitor C4 is electrically connected with the collector electrode of the NPN triode Q4, and the second end of the filter capacitor C4 is grounded;
the accessed working power supply signal +12v may have ac crosstalk, and when ac crosstalk occurs, false triggering to the first MOS transistor Q3 is avoided through the capacitor C4 to ground.
As shown in fig. 4, the synchronous rectification switching power supply further includes a second MOS transistor driving circuit, where the second MOS transistor driving circuit includes a resistor R4, a first end of the resistor R4 is electrically connected to a third end (i.e., a pin 5) of the secondary winding of the transformer T1, a second end of the resistor R4 is electrically connected to a gate of the second MOS transistor Q1, a first end (i.e., a pin 4) of the secondary winding of the transformer T1 is electrically connected to a drain of the second MOS transistor Q1, a current induced in a portion of the secondary winding of the transformer T1 corresponding to the first end (i.e., the pin 4) to the second end (i.e., the pin 3) is output to the drain of the second MOS transistor Q1, and is output to an output end of the synchronous rectification switching power supply when the second MOS transistor is turned on, and a current induced in a portion of the secondary winding of the transformer T1 corresponding to the third end (i.e., the pin 5) to the second end (i.e., the pin 3) is output to the gate of the second MOS transistor Q1 through the resistor R4 to turn on;
the synchronous rectification switching power supply further comprises an absorption circuit, the absorption circuit comprises a diode D1, a capacitor C2 and a resistor R3, the first end of the resistor R3 is respectively and electrically connected with the third end (namely a pin 5) of the secondary winding of the transformer T1 and the first end of a resistor R4, the second end of the resistor R3 is respectively and electrically connected with the cathode of the diode D1 and the first end of the capacitor C2, and the anode of the diode D1 and the second end of the capacitor C2 are respectively and electrically connected with the second end of the resistor R4; the absorption circuit is used for absorbing leakage inductance peak voltage of the second MOS tube Q1;
the synchronous rectification switching power supply further comprises a bidirectional TVS tube TVS2, wherein a first anode of the bidirectional TVS tube TVS2 is electrically connected with a drain electrode of the second MOS tube Q1, and a second anode of the bidirectional TVS tube TVS2 is electrically connected with a source electrode of the second MOS tube Q1; the bidirectional TVS tube TVS2 is used for clamping the voltage at two ends of the second MOS tube Q1, so that the second MOS tube Q1 is prevented from being damaged;
the synchronous rectification switching power supply further comprises a capacitor C6 and a resistor R13, wherein the first end of the capacitor C6 is electrically connected with the drain electrode of the second MOS tube Q1, the second end of the capacitor C6 is electrically connected with the first end of the resistor R13, and the second end of the resistor R13 is electrically connected with the source electrode of the second MOS tube Q1; the capacitor C6 and the resistor R13 are used for absorbing common mode noise generated at the turn-off moment of the second MOS transistor Q1.
As shown in fig. 4, a first end (i.e., pin 1) of a primary winding of a transformer T1 is connected to an input power supply signal (i.e., v_bulk), a second end (i.e., pin 2) of the primary winding of the transformer T1 is electrically connected to a drain of a MOS transistor Q5, a source of the MOS transistor Q5 is grounded, a gate of the MOS transistor Q5 is connected to a control signal (i.e., PWM 2) through a resistor R11, when the control signal PWM2 is at a high level, the MOS transistor Q5 is turned on, and the power supply signal v_bulk flows through the primary winding of the transformer T1, the MOS transistor Q5 and then to ground;
the synchronous rectification switching power supply further comprises a diode D6 and a resistor R14, wherein the cathode of the diode D6 is electrically connected with the first end of the resistor R11, the anode of the diode D6 is electrically connected with the first end of the resistor R14, the second end of the resistor R14 is respectively electrically connected with the second end of the resistor R11 and the grid electrode of the MOS tube Q5, and the diode D6 and the resistor R14 inhibit parasitic conduction of the MOS tube Q5 in a parallel manner;
the synchronous rectification switching power supply further comprises a resistor R15, a first end of the resistor R15 is electrically connected with the grid electrode of the MOS tube Q5, a second end of the resistor R15 is grounded, and the resistance value of the resistor R15 is larger, such as 20KΩ, so that input impedance is reduced.
As shown in fig. 4, the synchronous rectification switching power supply further includes a capacitor C1, a zener diode ZD1, a resistor R2, a resistor R7, a diode D2, a MOS transistor Q2, and a capacitor C3;
the cathode of the zener diode ZD1 and the first end of the capacitor C1 are connected with control signals (i.e. PWM 1), the anode of the zener diode ZD1 and the second end of the capacitor C1 are respectively and electrically connected with the first end of the resistor R1, the second end of the resistor R1 is respectively and electrically connected with the first end of the resistor R2, the first end of the resistor R7 and the grid electrode of the MOS transistor Q2, the second end of the resistor R2 is electrically connected with the anode of the diode D2, the cathode of the diode D2, the second end of the resistor R7 and the source electrode of the MOS transistor Q2 are respectively grounded, the drain electrode of the MOS transistor Q2 is electrically connected with the first end of the capacitor C3, and the second end of the capacitor C3 is respectively and electrically connected with the drain electrode of the MOS transistor Q5 and the second end (i.e. pin 2) of the primary winding of the transformer T1;
the functions of the capacitor C1, the zener diode ZD1, the resistor R2, the resistor R7, the diode D2, the MOS transistor Q2, and the capacitor C3 may be according to the above embodiments, and will not be described herein again.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.
The spike voltage control circuit and the synchronous rectification switching power supply provided by the application are described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the application, and the description of the above examples is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, the present description should not be construed as limiting the present application.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Claims (10)
1. A spike voltage control circuit for controlling a spike voltage present on a first switching tube in a synchronous rectification switching power supply; the spike voltage control circuit includes:
the device comprises a charging and discharging capacity, a first on-off control unit, a second on-off control unit and an energy consumption unit;
the first end of the charge-discharge capacity is electrically connected with the first access end of the first switch tube, the second end of the charge-discharge capacity is electrically connected with the first end of the first on-off control unit and the second end of the second on-off control unit respectively, the second end of the first on-off control unit is electrically connected with the positive electrode of the energy storage electrolytic capacitor of the synchronous rectification switch power supply, the first end of the second on-off control unit is electrically connected with the second access end of the first switch tube and the negative electrode of the energy storage electrolytic capacitor respectively, and the energy consumption unit is connected between the second end of the charge-discharge capacity and the positive electrode of the energy storage electrolytic capacitor in series;
the charging and discharging capacity is used for absorbing and storing energy of peak voltage generated when the first switching tube is disconnected;
the first on-off control unit is used for realizing unidirectional conduction from a first end to a second end of the first on-off control unit when the first switching tube is disconnected, and the second on-off control unit is used for realizing unidirectional conduction from the first end to the second end of the second on-off control unit when the first switching tube is disconnected so as to transmit the energy stored by the charging and discharging capacity to the energy storage electrolytic capacitor for storage when the first switching tube is disconnected;
the energy consumption unit is used for consuming a part of energy transmitted to the energy storage electrolytic capacitor by the charging and discharging capacity.
2. The spike voltage control circuit of claim 1 wherein the energy consuming unit comprises a bleed resistor;
the discharging resistor is connected in series between the second end of the charging and discharging capacity and the positive electrode of the energy storage electrolytic capacitor.
3. The spike voltage control circuit of claim 1 or 2 wherein a first end of the energy dissipating unit is electrically connected to a second end of the first on-off control unit, the second end of the energy dissipating unit being electrically connected to an anode of the energy storage electrolytic capacitor.
4. The spike voltage control circuit of claim 1 wherein the first on-off control unit comprises a first diode;
the anode of the first diode is electrically connected with the second end of the charging and discharging capacity and the second end of the second on-off control unit respectively, and the cathode of the first diode is electrically connected with the anode of the energy storage electrolytic capacitor.
5. The spike voltage control circuit of claim 1 wherein the second on-off control unit comprises a second diode;
the cathode of the second diode is respectively and electrically connected with the second end of the charging and discharging capacity and the first end of the first on-off control unit, and the anode of the second diode is respectively and electrically connected with the second access end of the first switch tube and the cathode of the energy storage electrolytic capacitor.
6. The spike voltage control circuit of claim 1 wherein the spike voltage control circuit further comprises:
a clamping unit;
the first end of the clamping unit is respectively and electrically connected with the first end of the charging and discharging capacity and the first access end of the first switch tube, and the second end of the clamping unit is respectively and electrically connected with the positive electrode of the energy storage electrolytic capacitor and the second end of the first on-off control unit;
the clamping unit is used for transmitting energy corresponding to the peak voltage generated by the first switching tube to the energy storage electrolytic capacitor for storage when the peak voltage generated by the first switching tube exceeds a preset voltage.
7. The peak voltage control circuit of claim 6, wherein the clamp unit includes a bi-directional TVS tube;
the first anode of the bidirectional TVS tube is electrically connected with the first access end of the first switch tube and the first end of the charge-discharge capacity respectively, and the second anode of the bidirectional TVS tube is electrically connected with the second end of the first on-off control unit and the anode of the energy storage electrolytic capacitor respectively.
8. The synchronous rectification switching power supply comprises a transformer, a second switching tube, a first switching tube, an energy storage electrolytic capacitor and an inductor, wherein a first access end of the second switching tube is electrically connected with a first end of a secondary winding of the transformer, a second access end of the second switching tube is respectively electrically connected with the first end of the inductor and the first access end of the first switching tube, a second end of the inductor is electrically connected with an anode of the energy storage electrolytic capacitor, and a second end of the secondary winding of the transformer, the first access end of the first switching tube and a cathode of the energy storage electrolytic capacitor are respectively grounded; the synchronous rectification switching power supply is characterized by further comprising:
the spike voltage control circuit of any of claims 1 to 7.
9. The synchronous rectification switching power supply of claim 8, further comprising a first switching tube driving circuit; the first switching tube driving circuit includes:
NPN triode and PNP triode;
the base of the NPN triode and the base of the PNP triode are respectively connected with control signals, the collector of the NPN triode is connected with a working power supply signal, the emitter of the NPN triode is respectively and electrically connected with the control end of the first switch tube and the collector of the PNP triode, and the emitter of the PNP triode is grounded.
10. The synchronous rectification switching power supply of claim 9, wherein said first switching tube driving circuit further comprises:
a filter capacitor;
the first end of the filter capacitor is electrically connected with the collector electrode of the NPN triode, and the second end of the filter capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311291102.9A CN117200561A (en) | 2023-09-28 | 2023-09-28 | Spike voltage control circuit and synchronous rectification switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311291102.9A CN117200561A (en) | 2023-09-28 | 2023-09-28 | Spike voltage control circuit and synchronous rectification switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117200561A true CN117200561A (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311291102.9A Pending CN117200561A (en) | 2023-09-28 | 2023-09-28 | Spike voltage control circuit and synchronous rectification switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117200561A (en) |
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2023
- 2023-09-28 CN CN202311291102.9A patent/CN117200561A/en active Pending
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